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authorYann Herklotz <ymherklotz@gmail.com>2018-01-08 14:09:43 +0000
committerYann Herklotz <ymherklotz@gmail.com>2018-01-08 14:09:43 +0000
commitc514e44b73b3fc4db492e4bd333fa223c6c1eef5 (patch)
treebb1cc421392f263531b82ad1a67454eb351bbd74 /yage
parent0a42123b150e06f28ae82e460e854984c2dc9648 (diff)
downloadYAGE-c514e44b73b3fc4db492e4bd333fa223c6c1eef5.tar.gz
YAGE-c514e44b73b3fc4db492e4bd333fa223c6c1eef5.zip
[Engine] Adding entity/component system
Diffstat (limited to 'yage')
-rw-r--r--yage/core/logger.h7
-rw-r--r--yage/core/logmessage.cpp4
-rw-r--r--yage/core/logmessage.h3
-rw-r--r--yage/core/resourcemanager.cpp3
-rw-r--r--yage/core/stb_image.cpp8
-rw-r--r--yage/core/stb_image.h11498
-rw-r--r--yage/core/window.cpp13
-rw-r--r--yage/engine/engine.cpp52
-rw-r--r--yage/engine/engine.h44
-rw-r--r--yage/engine/system.h39
-rw-r--r--yage/render/batch.h8
-rw-r--r--yage/render/drawable.h8
-rw-r--r--yage/render/ellipse.h10
-rw-r--r--yage/render/rectangle.cpp12
-rw-r--r--yage/render/rectangle.h8
-rw-r--r--yage/render/shader.h2
-rw-r--r--yage/render/shape.h8
-rw-r--r--yage/render/spritebatch.cpp2
-rw-r--r--yage/yage.h2
19 files changed, 6451 insertions, 5280 deletions
diff --git a/yage/core/logger.h b/yage/core/logger.h
index 2423f3c3..2249f79c 100644
--- a/yage/core/logger.h
+++ b/yage/core/logger.h
@@ -29,8 +29,8 @@ public:
explicit Logger(LogLevel min_level);
Logger(LogLevel min_level, const std::string &file_path);
- LogMessage operator()(LogLevel level = LogLevel::INFO, const std::string &fileName = "",
- int lineNum = -1);
+ LogMessage operator()(LogLevel level = LogLevel::INFO,
+ const std::string &fileName = "", int lineNum = -1);
void flush(const LogMessage *msg);
void add(const LogSink &sink);
@@ -55,7 +55,8 @@ private:
#define yLogDebug \
(yage::Logger::instance()(yage::LogLevel::DEBUG, __FILE__, __LINE__))
-#define yLogInfo (yage::Logger::instance()(yage::LogLevel::INFO, __FILE__, __LINE__))
+#define yLogInfo \
+ (yage::Logger::instance()(yage::LogLevel::INFO, __FILE__, __LINE__))
#define yLogWarning \
(yage::Logger::instance()(yage::LogLevel::WARNING, __FILE__, __LINE__))
diff --git a/yage/core/logmessage.cpp b/yage/core/logmessage.cpp
index 641c96b6..bda20fb0 100644
--- a/yage/core/logmessage.cpp
+++ b/yage/core/logmessage.cpp
@@ -14,8 +14,8 @@
namespace yage
{
-LogMessage::LogMessage(Logger *owner, LogLevel level, const std::string &file_name,
- int line_num)
+LogMessage::LogMessage(Logger *owner, LogLevel level,
+ const std::string &file_name, int line_num)
: owner_(owner), meta_({level, file_name, line_num})
{
}
diff --git a/yage/core/logmessage.h b/yage/core/logmessage.h
index b6929ba5..5698e4c0 100644
--- a/yage/core/logmessage.h
+++ b/yage/core/logmessage.h
@@ -48,7 +48,8 @@ private:
Logger *owner_;
Meta meta_;
- LogMessage(Logger *owner, LogLevel level, const std::string &file_name, int line_num);
+ LogMessage(Logger *owner, LogLevel level, const std::string &file_name,
+ int line_num);
LogMessage(LogMessage &&msg);
};
diff --git a/yage/core/resourcemanager.cpp b/yage/core/resourcemanager.cpp
index ec3761b8..2105f7e0 100644
--- a/yage/core/resourcemanager.cpp
+++ b/yage/core/resourcemanager.cpp
@@ -14,7 +14,8 @@ namespace yage
TextureCache ResourceManager::texture_cache_;
-Texture ResourceManager::getTexture(const std::string &texture_path, int x, int y)
+Texture ResourceManager::getTexture(const std::string &texture_path, int x,
+ int y)
{
return texture_cache_.getTexture(texture_path, x, y);
}
diff --git a/yage/core/stb_image.cpp b/yage/core/stb_image.cpp
index 8ddfd1f5..128d5cca 100644
--- a/yage/core/stb_image.cpp
+++ b/yage/core/stb_image.cpp
@@ -1,2 +1,10 @@
+/** ---------------------------------------------------------------------------
+ * @file: stb_image.cpp
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
diff --git a/yage/core/stb_image.h b/yage/core/stb_image.h
index a056138d..d4eecf29 100644
--- a/yage/core/stb_image.h
+++ b/yage/core/stb_image.h
@@ -1,9 +1,18 @@
-/* stb_image - v2.16 - public domain image loader - http://nothings.org/stb_image.h
- no warranty implied; use at your own risk
+/** ---------------------------------------------------------------------------
+ * @file: stb_image.h
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
+/* stb_image - v2.16 - public domain image loader -
+http://nothings.org/stb_image.h no warranty implied; use at your own risk
Do this:
#define STB_IMAGE_IMPLEMENTATION
- before you include this file in *one* C or C++ file to create the implementation.
+ before you include this file in *one* C or C++ file to create the
+implementation.
// i.e. it should look like this:
#include ...
@@ -13,15 +22,16 @@
#include "stb_image.h"
You can #define STBI_ASSERT(x) before the #include to avoid using assert.h.
- And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free
+ And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using
+malloc,realloc,free
QUICK NOTES:
Primarily of interest to game developers and other people who can
avoid problematic images and only need the trivial interface
- JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib)
- PNG 1/2/4/8/16-bit-per-channel
+ JPEG baseline & progressive (12 bpc/arithmetic not supported, same as
+stock IJG lib) PNG 1/2/4/8/16-bit-per-channel
TGA (not sure what subset, if a subset)
BMP non-1bpp, non-RLE
@@ -48,17 +58,15 @@ LICENSE
RECENT REVISION HISTORY:
- 2.16 (2017-07-23) all functions have 16-bit variants; optimizations; bugfixes
- 2.15 (2017-03-18) fix png-1,2,4; all Imagenet JPGs; no runtime SSE detection on GCC
- 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs
- 2.13 (2016-12-04) experimental 16-bit API, only for PNG so far; fixes
- 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes
- 2.11 (2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64
- RGB-format JPEG; remove white matting in PSD;
- allocate large structures on the stack;
- correct channel count for PNG & BMP
- 2.10 (2016-01-22) avoid warning introduced in 2.09
- 2.09 (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED
+ 2.16 (2017-07-23) all functions have 16-bit variants; optimizations;
+bugfixes 2.15 (2017-03-18) fix png-1,2,4; all Imagenet JPGs; no runtime SSE
+detection on GCC 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for
+Imagenet JPGs 2.13 (2016-12-04) experimental 16-bit API, only for PNG so far;
+fixes 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes 2.11
+(2016-04-02) 16-bit PNGS; enable SSE2 in non-gcc x64 RGB-format JPEG; remove
+white matting in PSD; allocate large structures on the stack; correct channel
+count for PNG & BMP 2.10 (2016-01-22) avoid warning introduced in 2.09 2.09
+(2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED
See end of file for full revision history.
@@ -76,27 +84,26 @@ RECENT REVISION HISTORY:
github:urraka (animated gif) Junggon Kim (PNM comments)
Daniel Gibson (16-bit TGA)
socks-the-fox (16-bit PNG)
- Jeremy Sawicki (handle all ImageNet JPGs)
- Optimizations & bugfixes
- Fabian "ryg" Giesen
- Arseny Kapoulkine
- John-Mark Allen
+ Jeremy Sawicki (handle all ImageNet
+JPGs) Optimizations & bugfixes Fabian "ryg" Giesen Arseny Kapoulkine John-Mark
+Allen
Bug & warning fixes
- Marc LeBlanc David Woo Guillaume George Martins Mozeiko
- Christpher Lloyd Jerry Jansson Joseph Thomson Phil Jordan
- Dave Moore Roy Eltham Hayaki Saito Nathan Reed
+ Marc LeBlanc David Woo Guillaume George Martins
+Mozeiko Christpher Lloyd Jerry Jansson Joseph Thomson Phil
+Jordan Dave Moore Roy Eltham Hayaki Saito Nathan Reed
Won Chun Luke Graham Johan Duparc Nick Verigakis
- the Horde3D community Thomas Ruf Ronny Chevalier Baldur Karlsson
- Janez Zemva John Bartholomew Michal Cichon github:rlyeh
- Jonathan Blow Ken Hamada Tero Hanninen github:romigrou
- Laurent Gomila Cort Stratton Sergio Gonzalez github:svdijk
- Aruelien Pocheville Thibault Reuille Cass Everitt github:snagar
- Ryamond Barbiero Paul Du Bois Engin Manap github:Zelex
- Michaelangel007@github Philipp Wiesemann Dale Weiler github:grim210
- Oriol Ferrer Mesia Josh Tobin Matthew Gregan github:sammyhw
- Blazej Dariusz Roszkowski Gregory Mullen github:phprus
- Christian Floisand Kevin Schmidt github:poppolopoppo
+ the Horde3D community Thomas Ruf Ronny Chevalier Baldur
+Karlsson Janez Zemva John Bartholomew Michal Cichon
+github:rlyeh Jonathan Blow Ken Hamada Tero Hanninen
+github:romigrou Laurent Gomila Cort Stratton Sergio Gonzalez
+github:svdijk Aruelien Pocheville Thibault Reuille Cass Everitt
+github:snagar Ryamond Barbiero Paul Du Bois Engin Manap
+github:Zelex Michaelangel007@github Philipp Wiesemann Dale Weiler
+github:grim210 Oriol Ferrer Mesia Josh Tobin Matthew Gregan
+github:sammyhw Blazej Dariusz Roszkowski Gregory Mullen
+github:phprus Christian Floisand Kevin Schmidt
+github:poppolopoppo
*/
#ifndef STBI_INCLUDE_STB_IMAGE_H
@@ -117,14 +124,15 @@ RECENT REVISION HISTORY:
// // ... process data if not NULL ...
// // ... x = width, y = height, n = # 8-bit components per pixel ...
// // ... replace '0' with '1'..'4' to force that many components per pixel
-// // ... but 'n' will always be the number that it would have been if you said 0
-// stbi_image_free(data)
+// // ... but 'n' will always be the number that it would have been if you
+// said 0 stbi_image_free(data)
//
// Standard parameters:
// int *x -- outputs image width in pixels
// int *y -- outputs image height in pixels
// int *channels_in_file -- outputs # of image components in image file
-// int desired_channels -- if non-zero, # of image components requested in result
+// int desired_channels -- if non-zero, # of image components requested in
+// result
//
// The return value from an image loader is an 'unsigned char *' which points
// to the pixel data, or NULL on an allocation failure or if the image is
@@ -152,8 +160,8 @@ RECENT REVISION HISTORY:
// and *x, *y, *channels_in_file will be unchanged. The function
// stbi_failure_reason() can be queried for an extremely brief, end-user
// unfriendly explanation of why the load failed. Define STBI_NO_FAILURE_STRINGS
-// to avoid compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly
-// more user-friendly ones.
+// to avoid compiling these strings at all, and STBI_FAILURE_USERMSG to get
+// slightly more user-friendly ones.
//
// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized.
//
@@ -167,11 +175,12 @@ RECENT REVISION HISTORY:
// 2. easy to maintain
// 3. good performance
//
-// Sometimes I let "good performance" creep up in priority over "easy to maintain",
-// and for best performance I may provide less-easy-to-use APIs that give higher
-// performance, in addition to the easy to use ones. Nevertheless, it's important
-// to keep in mind that from the standpoint of you, a client of this library,
-// all you care about is #1 and #3, and stb libraries DO NOT emphasize #3 above all.
+// Sometimes I let "good performance" creep up in priority over "easy to
+// maintain", and for best performance I may provide less-easy-to-use APIs that
+// give higher performance, in addition to the easy to use ones. Nevertheless,
+// it's important to keep in mind that from the standpoint of you, a client of
+// this library, all you care about is #1 and #3, and stb libraries DO NOT
+// emphasize #3 above all.
//
// Some secondary priorities arise directly from the first two, some of which
// make more explicit reasons why performance can't be emphasized.
@@ -190,7 +199,8 @@ RECENT REVISION HISTORY:
// overhead.
//
// The three functions you must define are "read" (reads some bytes of data),
-// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end).
+// "skip" (skips some bytes of data), "eof" (reports if the stream is at the
+// end).
//
// ===========================================================================
//
@@ -300,21 +310,19 @@ RECENT REVISION HISTORY:
// want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB
//
-
#ifndef STBI_NO_STDIO
#include <stdio.h>
#endif // STBI_NO_STDIO
#define STBI_VERSION 1
-enum
-{
- STBI_default = 0, // only used for desired_channels
+enum {
+ STBI_default = 0, // only used for desired_channels
- STBI_grey = 1,
- STBI_grey_alpha = 2,
- STBI_rgb = 3,
- STBI_rgb_alpha = 4
+ STBI_grey = 1,
+ STBI_grey_alpha = 2,
+ STBI_rgb = 3,
+ STBI_rgb_alpha = 4
};
typedef unsigned char stbi_uc;
@@ -339,11 +347,13 @@ extern "C" {
// load image by filename, open file, or memory buffer
//
-typedef struct
-{
- int (*read) (void *user,char *data,int size); // fill 'data' with 'size' bytes. return number of bytes actually read
- void (*skip) (void *user,int n); // skip the next 'n' bytes, or 'unget' the last -n bytes if negative
- int (*eof) (void *user); // returns nonzero if we are at end of file/data
+typedef struct {
+ int (*read)(void *user, char *data, int size); // fill 'data' with 'size'
+ // bytes. return number of
+ // bytes actually read
+ void (*skip)(void *user, int n); // skip the next 'n' bytes, or 'unget' the
+ // last -n bytes if negative
+ int (*eof)(void *user); // returns nonzero if we are at end of file/data
} stbi_io_callbacks;
////////////////////////////////////
@@ -351,13 +361,22 @@ typedef struct
// 8-bits-per-channel interface
//
-STBIDEF stbi_uc *stbi_load_from_memory (stbi_uc const *buffer, int len , int *x, int *y, int *channels_in_file, int desired_channels);
-STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk , void *user, int *x, int *y, int *channels_in_file, int desired_channels);
+STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x,
+ int *y, int *channels_in_file,
+ int desired_channels);
+STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk,
+ void *user, int *x, int *y,
+ int *channels_in_file,
+ int desired_channels);
#ifndef STBI_NO_STDIO
-STBIDEF stbi_uc *stbi_load (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
-STBIDEF stbi_uc *stbi_load_from_file (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
-// for stbi_load_from_file, file pointer is left pointing immediately after image
+STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y,
+ int *channels_in_file, int desired_channels);
+STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y,
+ int *channels_in_file,
+ int desired_channels);
+// for stbi_load_from_file, file pointer is left pointing immediately after
+// image
#endif
////////////////////////////////////
@@ -365,12 +384,20 @@ STBIDEF stbi_uc *stbi_load_from_file (FILE *f, int *x, int *y, int *channels_in
// 16-bits-per-channel interface
//
-STBIDEF stbi_us *stbi_load_16_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels);
-STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels);
+STBIDEF stbi_us *stbi_load_16_from_memory(stbi_uc const *buffer, int len,
+ int *x, int *y, int *channels_in_file,
+ int desired_channels);
+STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk,
+ void *user, int *x, int *y,
+ int *channels_in_file,
+ int desired_channels);
#ifndef STBI_NO_STDIO
-STBIDEF stbi_us *stbi_load_16 (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
-STBIDEF stbi_us *stbi_load_from_file_16(FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
+STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y,
+ int *channels_in_file, int desired_channels);
+STBIDEF stbi_us *stbi_load_from_file_16(FILE *f, int *x, int *y,
+ int *channels_in_file,
+ int desired_channels);
#endif
////////////////////////////////////
@@ -378,75 +405,92 @@ STBIDEF stbi_us *stbi_load_from_file_16(FILE *f, int *x, int *y, int *channels_i
// float-per-channel interface
//
#ifndef STBI_NO_LINEAR
- STBIDEF float *stbi_loadf_from_memory (stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels);
- STBIDEF float *stbi_loadf_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels);
+STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x,
+ int *y, int *channels_in_file,
+ int desired_channels);
+STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk,
+ void *user, int *x, int *y,
+ int *channels_in_file,
+ int desired_channels);
- #ifndef STBI_NO_STDIO
- STBIDEF float *stbi_loadf (char const *filename, int *x, int *y, int *channels_in_file, int desired_channels);
- STBIDEF float *stbi_loadf_from_file (FILE *f, int *x, int *y, int *channels_in_file, int desired_channels);
- #endif
+#ifndef STBI_NO_STDIO
+STBIDEF float *stbi_loadf(char const *filename, int *x, int *y,
+ int *channels_in_file, int desired_channels);
+STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y,
+ int *channels_in_file,
+ int desired_channels);
+#endif
#endif
#ifndef STBI_NO_HDR
- STBIDEF void stbi_hdr_to_ldr_gamma(float gamma);
- STBIDEF void stbi_hdr_to_ldr_scale(float scale);
+STBIDEF void stbi_hdr_to_ldr_gamma(float gamma);
+STBIDEF void stbi_hdr_to_ldr_scale(float scale);
#endif // STBI_NO_HDR
#ifndef STBI_NO_LINEAR
- STBIDEF void stbi_ldr_to_hdr_gamma(float gamma);
- STBIDEF void stbi_ldr_to_hdr_scale(float scale);
+STBIDEF void stbi_ldr_to_hdr_gamma(float gamma);
+STBIDEF void stbi_ldr_to_hdr_scale(float scale);
#endif // STBI_NO_LINEAR
// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR
-STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user);
-STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
+STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk,
+ void *user);
+STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
#ifndef STBI_NO_STDIO
-STBIDEF int stbi_is_hdr (char const *filename);
-STBIDEF int stbi_is_hdr_from_file(FILE *f);
+STBIDEF int stbi_is_hdr(char const *filename);
+STBIDEF int stbi_is_hdr_from_file(FILE *f);
#endif // STBI_NO_STDIO
-
// get a VERY brief reason for failure
// NOT THREADSAFE
-STBIDEF const char *stbi_failure_reason (void);
+STBIDEF const char *stbi_failure_reason(void);
// free the loaded image -- this is just free()
-STBIDEF void stbi_image_free (void *retval_from_stbi_load);
+STBIDEF void stbi_image_free(void *retval_from_stbi_load);
// get image dimensions & components without fully decoding
-STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
-STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp);
+STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x,
+ int *y, int *comp);
+STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user,
+ int *x, int *y, int *comp);
#ifndef STBI_NO_STDIO
-STBIDEF int stbi_info (char const *filename, int *x, int *y, int *comp);
-STBIDEF int stbi_info_from_file (FILE *f, int *x, int *y, int *comp);
+STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp);
+STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp);
#endif
-
-
// for image formats that explicitly notate that they have premultiplied alpha,
// we just return the colors as stored in the file. set this flag to force
// unpremultiplication. results are undefined if the unpremultiply overflow.
-STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);
+STBIDEF void
+stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);
// indicate whether we should process iphone images back to canonical format,
// or just pass them through "as-is"
STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
-// flip the image vertically, so the first pixel in the output array is the bottom left
+// flip the image vertically, so the first pixel in the output array is the
+// bottom left
STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip);
// ZLIB client - used by PNG, available for other purposes
-STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen);
-STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header);
+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len,
+ int initial_size, int *outlen);
+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer,
+ int len,
+ int initial_size,
+ int *outlen,
+ int parse_header);
STBIDEF char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
-STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
-
-STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
-STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
+STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen,
+ const char *ibuffer, int ilen);
+STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len,
+ int *outlen);
+STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen,
+ const char *ibuffer, int ilen);
#ifdef __cplusplus
}
@@ -459,52 +503,53 @@ STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const ch
#ifdef STB_IMAGE_IMPLEMENTATION
-#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \
- || defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \
- || defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \
- || defined(STBI_ONLY_ZLIB)
- #ifndef STBI_ONLY_JPEG
- #define STBI_NO_JPEG
- #endif
- #ifndef STBI_ONLY_PNG
- #define STBI_NO_PNG
- #endif
- #ifndef STBI_ONLY_BMP
- #define STBI_NO_BMP
- #endif
- #ifndef STBI_ONLY_PSD
- #define STBI_NO_PSD
- #endif
- #ifndef STBI_ONLY_TGA
- #define STBI_NO_TGA
- #endif
- #ifndef STBI_ONLY_GIF
- #define STBI_NO_GIF
- #endif
- #ifndef STBI_ONLY_HDR
- #define STBI_NO_HDR
- #endif
- #ifndef STBI_ONLY_PIC
- #define STBI_NO_PIC
- #endif
- #ifndef STBI_ONLY_PNM
- #define STBI_NO_PNM
- #endif
+#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || \
+ defined(STBI_ONLY_BMP) || defined(STBI_ONLY_TGA) || \
+ defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) || \
+ defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || \
+ defined(STBI_ONLY_PNM) || defined(STBI_ONLY_ZLIB)
+#ifndef STBI_ONLY_JPEG
+#define STBI_NO_JPEG
+#endif
+#ifndef STBI_ONLY_PNG
+#define STBI_NO_PNG
+#endif
+#ifndef STBI_ONLY_BMP
+#define STBI_NO_BMP
+#endif
+#ifndef STBI_ONLY_PSD
+#define STBI_NO_PSD
+#endif
+#ifndef STBI_ONLY_TGA
+#define STBI_NO_TGA
+#endif
+#ifndef STBI_ONLY_GIF
+#define STBI_NO_GIF
+#endif
+#ifndef STBI_ONLY_HDR
+#define STBI_NO_HDR
+#endif
+#ifndef STBI_ONLY_PIC
+#define STBI_NO_PIC
+#endif
+#ifndef STBI_ONLY_PNM
+#define STBI_NO_PNM
+#endif
#endif
-#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB)
+#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && \
+ !defined(STBI_NO_ZLIB)
#define STBI_NO_ZLIB
#endif
-
+#include <limits.h>
#include <stdarg.h>
#include <stddef.h> // ptrdiff_t on osx
#include <stdlib.h>
#include <string.h>
-#include <limits.h>
#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
-#include <math.h> // ldexp
+#include <math.h> // ldexp
#endif
#ifndef STBI_NO_STDIO
@@ -516,38 +561,36 @@ STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const ch
#define STBI_ASSERT(x) assert(x)
#endif
-
#ifndef _MSC_VER
- #ifdef __cplusplus
- #define stbi_inline inline
- #else
- #define stbi_inline
- #endif
+#ifdef __cplusplus
+#define stbi_inline inline
#else
- #define stbi_inline __forceinline
+#define stbi_inline
+#endif
+#else
+#define stbi_inline __forceinline
#endif
-
#ifdef _MSC_VER
typedef unsigned short stbi__uint16;
-typedef signed short stbi__int16;
-typedef unsigned int stbi__uint32;
-typedef signed int stbi__int32;
+typedef signed short stbi__int16;
+typedef unsigned int stbi__uint32;
+typedef signed int stbi__int32;
#else
#include <stdint.h>
typedef uint16_t stbi__uint16;
-typedef int16_t stbi__int16;
+typedef int16_t stbi__int16;
typedef uint32_t stbi__uint32;
-typedef int32_t stbi__int32;
+typedef int32_t stbi__int32;
#endif
// should produce compiler error if size is wrong
-typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1];
+typedef unsigned char validate_uint32[sizeof(stbi__uint32) == 4 ? 1 : -1];
#ifdef _MSC_VER
-#define STBI_NOTUSED(v) (void)(v)
+#define STBI_NOTUSED(v) (void)(v)
#else
-#define STBI_NOTUSED(v) (void)sizeof(v)
+#define STBI_NOTUSED(v) (void)sizeof(v)
#endif
#ifdef _MSC_VER
@@ -555,27 +598,30 @@ typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1];
#endif
#ifdef STBI_HAS_LROTL
- #define stbi_lrot(x,y) _lrotl(x,y)
+#define stbi_lrot(x, y) _lrotl(x, y)
#else
- #define stbi_lrot(x,y) (((x) << (y)) | ((x) >> (32 - (y))))
+#define stbi_lrot(x, y) (((x) << (y)) | ((x) >> (32 - (y))))
#endif
-#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED))
+#if defined(STBI_MALLOC) && defined(STBI_FREE) && \
+ (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED))
// ok
-#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED)
+#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && \
+ !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED)
// ok
#else
-#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)."
+#error \
+ "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)."
#endif
#ifndef STBI_MALLOC
-#define STBI_MALLOC(sz) malloc(sz)
-#define STBI_REALLOC(p,newsz) realloc(p,newsz)
-#define STBI_FREE(p) free(p)
+#define STBI_MALLOC(sz) malloc(sz)
+#define STBI_REALLOC(p, newsz) realloc(p, newsz)
+#define STBI_FREE(p) free(p)
#endif
#ifndef STBI_REALLOC_SIZED
-#define STBI_REALLOC_SIZED(p,oldsz,newsz) STBI_REALLOC(p,newsz)
+#define STBI_REALLOC_SIZED(p, oldsz, newsz) STBI_REALLOC(p, newsz)
#endif
// x86/x64 detection
@@ -585,7 +631,8 @@ typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1];
#define STBI__X86_TARGET
#endif
-#if defined(__GNUC__) && defined(STBI__X86_TARGET) && !defined(__SSE2__) && !defined(STBI_NO_SIMD)
+#if defined(__GNUC__) && defined(STBI__X86_TARGET) && !defined(__SSE2__) && \
+ !defined(STBI_NO_SIMD)
// gcc doesn't support sse2 intrinsics unless you compile with -msse2,
// which in turn means it gets to use SSE2 everywhere. This is unfortunate,
// but previous attempts to provide the SSE2 functions with runtime
@@ -596,8 +643,10 @@ typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1];
#define STBI_NO_SIMD
#endif
-#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD)
-// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET
+#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && \
+ !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD)
+// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid
+// STBI__X64_TARGET
//
// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the
// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant.
@@ -607,34 +656,36 @@ typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1];
// See https://github.com/nothings/stb/issues/81 for more information.
//
// So default to no SSE2 on 32-bit MinGW. If you've read this far and added
-// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2.
+// -mstackrealign to your build settings, feel free to #define
+// STBI_MINGW_ENABLE_SSE2.
#define STBI_NO_SIMD
#endif
-#if !defined(STBI_NO_SIMD) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET))
+#if !defined(STBI_NO_SIMD) && \
+ (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET))
#define STBI_SSE2
#include <emmintrin.h>
#ifdef _MSC_VER
-#if _MSC_VER >= 1400 // not VC6
-#include <intrin.h> // __cpuid
+#if _MSC_VER >= 1400 // not VC6
+#include <intrin.h> // __cpuid
static int stbi__cpuid3(void)
{
- int info[4];
- __cpuid(info,1);
- return info[3];
+ int info[4];
+ __cpuid(info, 1);
+ return info[3];
}
#else
static int stbi__cpuid3(void)
{
- int res;
- __asm {
+ int res;
+ __asm {
mov eax,1
cpuid
mov res,edx
- }
- return res;
+ }
+ return res;
}
#endif
@@ -642,18 +693,18 @@ static int stbi__cpuid3(void)
static int stbi__sse2_available(void)
{
- int info3 = stbi__cpuid3();
- return ((info3 >> 26) & 1) != 0;
+ int info3 = stbi__cpuid3();
+ return ((info3 >> 26) & 1) != 0;
}
#else // assume GCC-style if not VC++
#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
static int stbi__sse2_available(void)
{
- // If we're even attempting to compile this on GCC/Clang, that means
- // -msse2 is on, which means the compiler is allowed to use SSE2
- // instructions at will, and so are we.
- return 1;
+ // If we're even attempting to compile this on GCC/Clang, that means
+ // -msse2 is on, which means the compiler is allowed to use SSE2
+ // instructions at will, and so are we.
+ return 1;
}
#endif
#endif
@@ -679,153 +730,156 @@ static int stbi__sse2_available(void)
// stbi__context structure is our basic context used by all images, so it
// contains all the IO context, plus some basic image information
-typedef struct
-{
- stbi__uint32 img_x, img_y;
- int img_n, img_out_n;
+typedef struct {
+ stbi__uint32 img_x, img_y;
+ int img_n, img_out_n;
- stbi_io_callbacks io;
- void *io_user_data;
+ stbi_io_callbacks io;
+ void *io_user_data;
- int read_from_callbacks;
- int buflen;
- stbi_uc buffer_start[128];
+ int read_from_callbacks;
+ int buflen;
+ stbi_uc buffer_start[128];
- stbi_uc *img_buffer, *img_buffer_end;
- stbi_uc *img_buffer_original, *img_buffer_original_end;
+ stbi_uc *img_buffer, *img_buffer_end;
+ stbi_uc *img_buffer_original, *img_buffer_original_end;
} stbi__context;
-
static void stbi__refill_buffer(stbi__context *s);
// initialize a memory-decode context
static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int len)
{
- s->io.read = NULL;
- s->read_from_callbacks = 0;
- s->img_buffer = s->img_buffer_original = (stbi_uc *) buffer;
- s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *) buffer+len;
+ s->io.read = NULL;
+ s->read_from_callbacks = 0;
+ s->img_buffer = s->img_buffer_original = (stbi_uc *)buffer;
+ s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *)buffer + len;
}
// initialize a callback-based context
-static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user)
+static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c,
+ void *user)
{
- s->io = *c;
- s->io_user_data = user;
- s->buflen = sizeof(s->buffer_start);
- s->read_from_callbacks = 1;
- s->img_buffer_original = s->buffer_start;
- stbi__refill_buffer(s);
- s->img_buffer_original_end = s->img_buffer_end;
+ s->io = *c;
+ s->io_user_data = user;
+ s->buflen = sizeof(s->buffer_start);
+ s->read_from_callbacks = 1;
+ s->img_buffer_original = s->buffer_start;
+ stbi__refill_buffer(s);
+ s->img_buffer_original_end = s->img_buffer_end;
}
#ifndef STBI_NO_STDIO
static int stbi__stdio_read(void *user, char *data, int size)
{
- return (int) fread(data,1,size,(FILE*) user);
+ return (int)fread(data, 1, size, (FILE *)user);
}
static void stbi__stdio_skip(void *user, int n)
{
- fseek((FILE*) user, n, SEEK_CUR);
+ fseek((FILE *)user, n, SEEK_CUR);
}
static int stbi__stdio_eof(void *user)
{
- return feof((FILE*) user);
+ return feof((FILE *)user);
}
-static stbi_io_callbacks stbi__stdio_callbacks =
-{
- stbi__stdio_read,
- stbi__stdio_skip,
- stbi__stdio_eof,
+static stbi_io_callbacks stbi__stdio_callbacks = {
+ stbi__stdio_read,
+ stbi__stdio_skip,
+ stbi__stdio_eof,
};
static void stbi__start_file(stbi__context *s, FILE *f)
{
- stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *) f);
+ stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *)f);
}
-//static void stop_file(stbi__context *s) { }
+ // static void stop_file(stbi__context *s) { }
#endif // !STBI_NO_STDIO
static void stbi__rewind(stbi__context *s)
{
- // conceptually rewind SHOULD rewind to the beginning of the stream,
- // but we just rewind to the beginning of the initial buffer, because
- // we only use it after doing 'test', which only ever looks at at most 92 bytes
- s->img_buffer = s->img_buffer_original;
- s->img_buffer_end = s->img_buffer_original_end;
+ // conceptually rewind SHOULD rewind to the beginning of the stream,
+ // but we just rewind to the beginning of the initial buffer, because
+ // we only use it after doing 'test', which only ever looks at at most 92
+ // bytes
+ s->img_buffer = s->img_buffer_original;
+ s->img_buffer_end = s->img_buffer_original_end;
}
-enum
-{
- STBI_ORDER_RGB,
- STBI_ORDER_BGR
-};
+enum { STBI_ORDER_RGB, STBI_ORDER_BGR };
-typedef struct
-{
- int bits_per_channel;
- int num_channels;
- int channel_order;
+typedef struct {
+ int bits_per_channel;
+ int num_channels;
+ int channel_order;
} stbi__result_info;
#ifndef STBI_NO_JPEG
-static int stbi__jpeg_test(stbi__context *s);
-static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
-static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp);
+static int stbi__jpeg_test(stbi__context *s);
+static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri);
+static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_PNG
-static int stbi__png_test(stbi__context *s);
-static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
-static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp);
+static int stbi__png_test(stbi__context *s);
+static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri);
+static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_BMP
-static int stbi__bmp_test(stbi__context *s);
-static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
-static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp);
+static int stbi__bmp_test(stbi__context *s);
+static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri);
+static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_TGA
-static int stbi__tga_test(stbi__context *s);
-static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
-static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp);
+static int stbi__tga_test(stbi__context *s);
+static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri);
+static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_PSD
-static int stbi__psd_test(stbi__context *s);
-static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc);
-static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp);
+static int stbi__psd_test(stbi__context *s);
+static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri, int bpc);
+static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_HDR
-static int stbi__hdr_test(stbi__context *s);
-static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
-static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp);
+static int stbi__hdr_test(stbi__context *s);
+static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri);
+static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_PIC
-static int stbi__pic_test(stbi__context *s);
-static void *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
-static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp);
+static int stbi__pic_test(stbi__context *s);
+static void *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri);
+static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_GIF
-static int stbi__gif_test(stbi__context *s);
-static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
-static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp);
+static int stbi__gif_test(stbi__context *s);
+static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri);
+static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp);
#endif
#ifndef STBI_NO_PNM
-static int stbi__pnm_test(stbi__context *s);
-static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri);
-static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp);
+static int stbi__pnm_test(stbi__context *s);
+static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri);
+static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp);
#endif
// this is not threadsafe
@@ -833,13 +887,13 @@ static const char *stbi__g_failure_reason;
STBIDEF const char *stbi_failure_reason(void)
{
- return stbi__g_failure_reason;
+ return stbi__g_failure_reason;
}
static int stbi__err(const char *str)
{
- stbi__g_failure_reason = str;
- return 0;
+ stbi__g_failure_reason = str;
+ return 0;
}
static void *stbi__malloc(size_t size)
@@ -861,89 +915,98 @@ static void *stbi__malloc(size_t size)
// negative terms are considered invalid.
static int stbi__addsizes_valid(int a, int b)
{
- if (b < 0) return 0;
- // now 0 <= b <= INT_MAX, hence also
- // 0 <= INT_MAX - b <= INTMAX.
- // And "a + b <= INT_MAX" (which might overflow) is the
- // same as a <= INT_MAX - b (no overflow)
- return a <= INT_MAX - b;
+ if (b < 0)
+ return 0;
+ // now 0 <= b <= INT_MAX, hence also
+ // 0 <= INT_MAX - b <= INTMAX.
+ // And "a + b <= INT_MAX" (which might overflow) is the
+ // same as a <= INT_MAX - b (no overflow)
+ return a <= INT_MAX - b;
}
// returns 1 if the product is valid, 0 on overflow.
// negative factors are considered invalid.
static int stbi__mul2sizes_valid(int a, int b)
{
- if (a < 0 || b < 0) return 0;
- if (b == 0) return 1; // mul-by-0 is always safe
- // portable way to check for no overflows in a*b
- return a <= INT_MAX/b;
+ if (a < 0 || b < 0)
+ return 0;
+ if (b == 0)
+ return 1; // mul-by-0 is always safe
+ // portable way to check for no overflows in a*b
+ return a <= INT_MAX / b;
}
// returns 1 if "a*b + add" has no negative terms/factors and doesn't overflow
static int stbi__mad2sizes_valid(int a, int b, int add)
{
- return stbi__mul2sizes_valid(a, b) && stbi__addsizes_valid(a*b, add);
+ return stbi__mul2sizes_valid(a, b) && stbi__addsizes_valid(a * b, add);
}
// returns 1 if "a*b*c + add" has no negative terms/factors and doesn't overflow
static int stbi__mad3sizes_valid(int a, int b, int c, int add)
{
- return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) &&
- stbi__addsizes_valid(a*b*c, add);
+ return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a * b, c) &&
+ stbi__addsizes_valid(a * b * c, add);
}
-// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't overflow
+// returns 1 if "a*b*c*d + add" has no negative terms/factors and doesn't
+// overflow
static int stbi__mad4sizes_valid(int a, int b, int c, int d, int add)
{
- return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a*b, c) &&
- stbi__mul2sizes_valid(a*b*c, d) && stbi__addsizes_valid(a*b*c*d, add);
+ return stbi__mul2sizes_valid(a, b) && stbi__mul2sizes_valid(a * b, c) &&
+ stbi__mul2sizes_valid(a * b * c, d) &&
+ stbi__addsizes_valid(a * b * c * d, add);
}
// mallocs with size overflow checking
static void *stbi__malloc_mad2(int a, int b, int add)
{
- if (!stbi__mad2sizes_valid(a, b, add)) return NULL;
- return stbi__malloc(a*b + add);
+ if (!stbi__mad2sizes_valid(a, b, add))
+ return NULL;
+ return stbi__malloc(a * b + add);
}
static void *stbi__malloc_mad3(int a, int b, int c, int add)
{
- if (!stbi__mad3sizes_valid(a, b, c, add)) return NULL;
- return stbi__malloc(a*b*c + add);
+ if (!stbi__mad3sizes_valid(a, b, c, add))
+ return NULL;
+ return stbi__malloc(a * b * c + add);
}
static void *stbi__malloc_mad4(int a, int b, int c, int d, int add)
{
- if (!stbi__mad4sizes_valid(a, b, c, d, add)) return NULL;
- return stbi__malloc(a*b*c*d + add);
+ if (!stbi__mad4sizes_valid(a, b, c, d, add))
+ return NULL;
+ return stbi__malloc(a * b * c * d + add);
}
-// stbi__err - error
-// stbi__errpf - error returning pointer to float
-// stbi__errpuc - error returning pointer to unsigned char
+ // stbi__err - error
+ // stbi__errpf - error returning pointer to float
+ // stbi__errpuc - error returning pointer to unsigned char
#ifdef STBI_NO_FAILURE_STRINGS
- #define stbi__err(x,y) 0
+#define stbi__err(x, y) 0
#elif defined(STBI_FAILURE_USERMSG)
- #define stbi__err(x,y) stbi__err(y)
+#define stbi__err(x, y) stbi__err(y)
#else
- #define stbi__err(x,y) stbi__err(x)
+#define stbi__err(x, y) stbi__err(x)
#endif
-#define stbi__errpf(x,y) ((float *)(size_t) (stbi__err(x,y)?NULL:NULL))
-#define stbi__errpuc(x,y) ((unsigned char *)(size_t) (stbi__err(x,y)?NULL:NULL))
+#define stbi__errpf(x, y) ((float *)(size_t)(stbi__err(x, y) ? NULL : NULL))
+#define stbi__errpuc(x, y) \
+ ((unsigned char *)(size_t)(stbi__err(x, y) ? NULL : NULL))
STBIDEF void stbi_image_free(void *retval_from_stbi_load)
{
- STBI_FREE(retval_from_stbi_load);
+ STBI_FREE(retval_from_stbi_load);
}
#ifndef STBI_NO_LINEAR
-static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
+static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
#endif
#ifndef STBI_NO_HDR
-static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp);
+static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp);
#endif
static int stbi__vertically_flip_on_load = 0;
@@ -953,163 +1016,193 @@ STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip)
stbi__vertically_flip_on_load = flag_true_if_should_flip;
}
-static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc)
+static void *stbi__load_main(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri, int bpc)
{
- memset(ri, 0, sizeof(*ri)); // make sure it's initialized if we add new fields
- ri->bits_per_channel = 8; // default is 8 so most paths don't have to be changed
- ri->channel_order = STBI_ORDER_RGB; // all current input & output are this, but this is here so we can add BGR order
- ri->num_channels = 0;
+ memset(ri, 0,
+ sizeof(*ri)); // make sure it's initialized if we add new fields
+ ri->bits_per_channel =
+ 8; // default is 8 so most paths don't have to be changed
+ ri->channel_order = STBI_ORDER_RGB; // all current input & output are this,
+ // but this is here so we can add BGR
+ // order
+ ri->num_channels = 0;
- #ifndef STBI_NO_JPEG
- if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp, ri);
- #endif
- #ifndef STBI_NO_PNG
- if (stbi__png_test(s)) return stbi__png_load(s,x,y,comp,req_comp, ri);
- #endif
- #ifndef STBI_NO_BMP
- if (stbi__bmp_test(s)) return stbi__bmp_load(s,x,y,comp,req_comp, ri);
- #endif
- #ifndef STBI_NO_GIF
- if (stbi__gif_test(s)) return stbi__gif_load(s,x,y,comp,req_comp, ri);
- #endif
- #ifndef STBI_NO_PSD
- if (stbi__psd_test(s)) return stbi__psd_load(s,x,y,comp,req_comp, ri, bpc);
- #endif
- #ifndef STBI_NO_PIC
- if (stbi__pic_test(s)) return stbi__pic_load(s,x,y,comp,req_comp, ri);
- #endif
- #ifndef STBI_NO_PNM
- if (stbi__pnm_test(s)) return stbi__pnm_load(s,x,y,comp,req_comp, ri);
- #endif
+#ifndef STBI_NO_JPEG
+ if (stbi__jpeg_test(s))
+ return stbi__jpeg_load(s, x, y, comp, req_comp, ri);
+#endif
+#ifndef STBI_NO_PNG
+ if (stbi__png_test(s))
+ return stbi__png_load(s, x, y, comp, req_comp, ri);
+#endif
+#ifndef STBI_NO_BMP
+ if (stbi__bmp_test(s))
+ return stbi__bmp_load(s, x, y, comp, req_comp, ri);
+#endif
+#ifndef STBI_NO_GIF
+ if (stbi__gif_test(s))
+ return stbi__gif_load(s, x, y, comp, req_comp, ri);
+#endif
+#ifndef STBI_NO_PSD
+ if (stbi__psd_test(s))
+ return stbi__psd_load(s, x, y, comp, req_comp, ri, bpc);
+#endif
+#ifndef STBI_NO_PIC
+ if (stbi__pic_test(s))
+ return stbi__pic_load(s, x, y, comp, req_comp, ri);
+#endif
+#ifndef STBI_NO_PNM
+ if (stbi__pnm_test(s))
+ return stbi__pnm_load(s, x, y, comp, req_comp, ri);
+#endif
- #ifndef STBI_NO_HDR
- if (stbi__hdr_test(s)) {
- float *hdr = stbi__hdr_load(s, x,y,comp,req_comp, ri);
- return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
- }
- #endif
+#ifndef STBI_NO_HDR
+ if (stbi__hdr_test(s)) {
+ float *hdr = stbi__hdr_load(s, x, y, comp, req_comp, ri);
+ return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
+ }
+#endif
- #ifndef STBI_NO_TGA
- // test tga last because it's a crappy test!
- if (stbi__tga_test(s))
- return stbi__tga_load(s,x,y,comp,req_comp, ri);
- #endif
+#ifndef STBI_NO_TGA
+ // test tga last because it's a crappy test!
+ if (stbi__tga_test(s))
+ return stbi__tga_load(s, x, y, comp, req_comp, ri);
+#endif
- return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt");
+ return stbi__errpuc("unknown image type",
+ "Image not of any known type, or corrupt");
}
-static stbi_uc *stbi__convert_16_to_8(stbi__uint16 *orig, int w, int h, int channels)
+static stbi_uc *stbi__convert_16_to_8(stbi__uint16 *orig, int w, int h,
+ int channels)
{
- int i;
- int img_len = w * h * channels;
- stbi_uc *reduced;
+ int i;
+ int img_len = w * h * channels;
+ stbi_uc *reduced;
- reduced = (stbi_uc *) stbi__malloc(img_len);
- if (reduced == NULL) return stbi__errpuc("outofmem", "Out of memory");
+ reduced = (stbi_uc *)stbi__malloc(img_len);
+ if (reduced == NULL)
+ return stbi__errpuc("outofmem", "Out of memory");
- for (i = 0; i < img_len; ++i)
- reduced[i] = (stbi_uc)((orig[i] >> 8) & 0xFF); // top half of each byte is sufficient approx of 16->8 bit scaling
+ for (i = 0; i < img_len; ++i)
+ reduced[i] = (stbi_uc)((orig[i] >> 8) & 0xFF); // top half of each byte
+ // is sufficient approx
+ // of 16->8 bit scaling
- STBI_FREE(orig);
- return reduced;
+ STBI_FREE(orig);
+ return reduced;
}
-static stbi__uint16 *stbi__convert_8_to_16(stbi_uc *orig, int w, int h, int channels)
+static stbi__uint16 *stbi__convert_8_to_16(stbi_uc *orig, int w, int h,
+ int channels)
{
- int i;
- int img_len = w * h * channels;
- stbi__uint16 *enlarged;
+ int i;
+ int img_len = w * h * channels;
+ stbi__uint16 *enlarged;
- enlarged = (stbi__uint16 *) stbi__malloc(img_len*2);
- if (enlarged == NULL) return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory");
+ enlarged = (stbi__uint16 *)stbi__malloc(img_len * 2);
+ if (enlarged == NULL)
+ return (stbi__uint16 *)stbi__errpuc("outofmem", "Out of memory");
- for (i = 0; i < img_len; ++i)
- enlarged[i] = (stbi__uint16)((orig[i] << 8) + orig[i]); // replicate to high and low byte, maps 0->0, 255->0xffff
+ for (i = 0; i < img_len; ++i)
+ enlarged[i] = (stbi__uint16)(
+ (orig[i] << 8) +
+ orig[i]); // replicate to high and low byte, maps 0->0, 255->0xffff
- STBI_FREE(orig);
- return enlarged;
+ STBI_FREE(orig);
+ return enlarged;
}
static void stbi__vertical_flip(void *image, int w, int h, int bytes_per_pixel)
{
- int row;
- size_t bytes_per_row = (size_t)w * bytes_per_pixel;
- stbi_uc temp[2048];
- stbi_uc *bytes = (stbi_uc *)image;
-
- for (row = 0; row < (h>>1); row++) {
- stbi_uc *row0 = bytes + row*bytes_per_row;
- stbi_uc *row1 = bytes + (h - row - 1)*bytes_per_row;
- // swap row0 with row1
- size_t bytes_left = bytes_per_row;
- while (bytes_left) {
- size_t bytes_copy = (bytes_left < sizeof(temp)) ? bytes_left : sizeof(temp);
- memcpy(temp, row0, bytes_copy);
- memcpy(row0, row1, bytes_copy);
- memcpy(row1, temp, bytes_copy);
- row0 += bytes_copy;
- row1 += bytes_copy;
- bytes_left -= bytes_copy;
- }
- }
+ int row;
+ size_t bytes_per_row = (size_t)w * bytes_per_pixel;
+ stbi_uc temp[2048];
+ stbi_uc *bytes = (stbi_uc *)image;
+
+ for (row = 0; row < (h >> 1); row++) {
+ stbi_uc *row0 = bytes + row * bytes_per_row;
+ stbi_uc *row1 = bytes + (h - row - 1) * bytes_per_row;
+ // swap row0 with row1
+ size_t bytes_left = bytes_per_row;
+ while (bytes_left) {
+ size_t bytes_copy =
+ (bytes_left < sizeof(temp)) ? bytes_left : sizeof(temp);
+ memcpy(temp, row0, bytes_copy);
+ memcpy(row0, row1, bytes_copy);
+ memcpy(row1, temp, bytes_copy);
+ row0 += bytes_copy;
+ row1 += bytes_copy;
+ bytes_left -= bytes_copy;
+ }
+ }
}
-static unsigned char *stbi__load_and_postprocess_8bit(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+static unsigned char *stbi__load_and_postprocess_8bit(stbi__context *s, int *x,
+ int *y, int *comp,
+ int req_comp)
{
- stbi__result_info ri;
- void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 8);
+ stbi__result_info ri;
+ void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 8);
- if (result == NULL)
- return NULL;
+ if (result == NULL)
+ return NULL;
- if (ri.bits_per_channel != 8) {
- STBI_ASSERT(ri.bits_per_channel == 16);
- result = stbi__convert_16_to_8((stbi__uint16 *) result, *x, *y, req_comp == 0 ? *comp : req_comp);
- ri.bits_per_channel = 8;
- }
+ if (ri.bits_per_channel != 8) {
+ STBI_ASSERT(ri.bits_per_channel == 16);
+ result = stbi__convert_16_to_8((stbi__uint16 *)result, *x, *y,
+ req_comp == 0 ? *comp : req_comp);
+ ri.bits_per_channel = 8;
+ }
- // @TODO: move stbi__convert_format to here
+ // @TODO: move stbi__convert_format to here
- if (stbi__vertically_flip_on_load) {
- int channels = req_comp ? req_comp : *comp;
- stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi_uc));
- }
+ if (stbi__vertically_flip_on_load) {
+ int channels = req_comp ? req_comp : *comp;
+ stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi_uc));
+ }
- return (unsigned char *) result;
+ return (unsigned char *)result;
}
-static stbi__uint16 *stbi__load_and_postprocess_16bit(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+static stbi__uint16 *stbi__load_and_postprocess_16bit(stbi__context *s, int *x,
+ int *y, int *comp,
+ int req_comp)
{
- stbi__result_info ri;
- void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 16);
+ stbi__result_info ri;
+ void *result = stbi__load_main(s, x, y, comp, req_comp, &ri, 16);
- if (result == NULL)
- return NULL;
+ if (result == NULL)
+ return NULL;
- if (ri.bits_per_channel != 16) {
- STBI_ASSERT(ri.bits_per_channel == 8);
- result = stbi__convert_8_to_16((stbi_uc *) result, *x, *y, req_comp == 0 ? *comp : req_comp);
- ri.bits_per_channel = 16;
- }
+ if (ri.bits_per_channel != 16) {
+ STBI_ASSERT(ri.bits_per_channel == 8);
+ result = stbi__convert_8_to_16((stbi_uc *)result, *x, *y,
+ req_comp == 0 ? *comp : req_comp);
+ ri.bits_per_channel = 16;
+ }
- // @TODO: move stbi__convert_format16 to here
- // @TODO: special case RGB-to-Y (and RGBA-to-YA) for 8-bit-to-16-bit case to keep more precision
+ // @TODO: move stbi__convert_format16 to here
+ // @TODO: special case RGB-to-Y (and RGBA-to-YA) for 8-bit-to-16-bit case to
+ // keep more precision
- if (stbi__vertically_flip_on_load) {
- int channels = req_comp ? req_comp : *comp;
- stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi__uint16));
- }
+ if (stbi__vertically_flip_on_load) {
+ int channels = req_comp ? req_comp : *comp;
+ stbi__vertical_flip(result, *x, *y, channels * sizeof(stbi__uint16));
+ }
- return (stbi__uint16 *) result;
+ return (stbi__uint16 *)result;
}
#ifndef STBI_NO_HDR
-static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp)
+static void stbi__float_postprocess(float *result, int *x, int *y, int *comp,
+ int req_comp)
{
- if (stbi__vertically_flip_on_load && result != NULL) {
- int channels = req_comp ? req_comp : *comp;
- stbi__vertical_flip(result, *x, *y, channels * sizeof(float));
- }
+ if (stbi__vertically_flip_on_load && result != NULL) {
+ int channels = req_comp ? req_comp : *comp;
+ stbi__vertical_flip(result, *x, *y, channels * sizeof(float));
+ }
}
#endif
@@ -1117,143 +1210,165 @@ static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, in
static FILE *stbi__fopen(char const *filename, char const *mode)
{
- FILE *f;
+ FILE *f;
#if defined(_MSC_VER) && _MSC_VER >= 1400
- if (0 != fopen_s(&f, filename, mode))
- f=0;
+ if (0 != fopen_s(&f, filename, mode))
+ f = 0;
#else
- f = fopen(filename, mode);
+ f = fopen(filename, mode);
#endif
- return f;
+ return f;
}
-
-STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp)
+STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp,
+ int req_comp)
{
- FILE *f = stbi__fopen(filename, "rb");
- unsigned char *result;
- if (!f) return stbi__errpuc("can't fopen", "Unable to open file");
- result = stbi_load_from_file(f,x,y,comp,req_comp);
- fclose(f);
- return result;
+ FILE *f = stbi__fopen(filename, "rb");
+ unsigned char *result;
+ if (!f)
+ return stbi__errpuc("can't fopen", "Unable to open file");
+ result = stbi_load_from_file(f, x, y, comp, req_comp);
+ fclose(f);
+ return result;
}
-STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
+STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp,
+ int req_comp)
{
- unsigned char *result;
- stbi__context s;
- stbi__start_file(&s,f);
- result = stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
- if (result) {
- // need to 'unget' all the characters in the IO buffer
- fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR);
- }
- return result;
+ unsigned char *result;
+ stbi__context s;
+ stbi__start_file(&s, f);
+ result = stbi__load_and_postprocess_8bit(&s, x, y, comp, req_comp);
+ if (result) {
+ // need to 'unget' all the characters in the IO buffer
+ fseek(f, -(int)(s.img_buffer_end - s.img_buffer), SEEK_CUR);
+ }
+ return result;
}
-STBIDEF stbi__uint16 *stbi_load_from_file_16(FILE *f, int *x, int *y, int *comp, int req_comp)
+STBIDEF stbi__uint16 *stbi_load_from_file_16(FILE *f, int *x, int *y, int *comp,
+ int req_comp)
{
- stbi__uint16 *result;
- stbi__context s;
- stbi__start_file(&s,f);
- result = stbi__load_and_postprocess_16bit(&s,x,y,comp,req_comp);
- if (result) {
- // need to 'unget' all the characters in the IO buffer
- fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR);
- }
- return result;
+ stbi__uint16 *result;
+ stbi__context s;
+ stbi__start_file(&s, f);
+ result = stbi__load_and_postprocess_16bit(&s, x, y, comp, req_comp);
+ if (result) {
+ // need to 'unget' all the characters in the IO buffer
+ fseek(f, -(int)(s.img_buffer_end - s.img_buffer), SEEK_CUR);
+ }
+ return result;
}
-STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *comp, int req_comp)
+STBIDEF stbi_us *stbi_load_16(char const *filename, int *x, int *y, int *comp,
+ int req_comp)
{
- FILE *f = stbi__fopen(filename, "rb");
- stbi__uint16 *result;
- if (!f) return (stbi_us *) stbi__errpuc("can't fopen", "Unable to open file");
- result = stbi_load_from_file_16(f,x,y,comp,req_comp);
- fclose(f);
- return result;
+ FILE *f = stbi__fopen(filename, "rb");
+ stbi__uint16 *result;
+ if (!f)
+ return (stbi_us *)stbi__errpuc("can't fopen", "Unable to open file");
+ result = stbi_load_from_file_16(f, x, y, comp, req_comp);
+ fclose(f);
+ return result;
}
+#endif //! STBI_NO_STDIO
-#endif //!STBI_NO_STDIO
-
-STBIDEF stbi_us *stbi_load_16_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *channels_in_file, int desired_channels)
+STBIDEF stbi_us *stbi_load_16_from_memory(stbi_uc const *buffer, int len,
+ int *x, int *y, int *channels_in_file,
+ int desired_channels)
{
- stbi__context s;
- stbi__start_mem(&s,buffer,len);
- return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels);
+ stbi__context s;
+ stbi__start_mem(&s, buffer, len);
+ return stbi__load_and_postprocess_16bit(&s, x, y, channels_in_file,
+ desired_channels);
}
-STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *channels_in_file, int desired_channels)
+STBIDEF stbi_us *stbi_load_16_from_callbacks(stbi_io_callbacks const *clbk,
+ void *user, int *x, int *y,
+ int *channels_in_file,
+ int desired_channels)
{
- stbi__context s;
- stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user);
- return stbi__load_and_postprocess_16bit(&s,x,y,channels_in_file,desired_channels);
+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user);
+ return stbi__load_and_postprocess_16bit(&s, x, y, channels_in_file,
+ desired_channels);
}
-STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
+STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x,
+ int *y, int *comp, int req_comp)
{
- stbi__context s;
- stbi__start_mem(&s,buffer,len);
- return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
+ stbi__context s;
+ stbi__start_mem(&s, buffer, len);
+ return stbi__load_and_postprocess_8bit(&s, x, y, comp, req_comp);
}
-STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
+STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk,
+ void *user, int *x, int *y, int *comp,
+ int req_comp)
{
- stbi__context s;
- stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
- return stbi__load_and_postprocess_8bit(&s,x,y,comp,req_comp);
+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user);
+ return stbi__load_and_postprocess_8bit(&s, x, y, comp, req_comp);
}
#ifndef STBI_NO_LINEAR
-static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp)
{
- unsigned char *data;
- #ifndef STBI_NO_HDR
- if (stbi__hdr_test(s)) {
- stbi__result_info ri;
- float *hdr_data = stbi__hdr_load(s,x,y,comp,req_comp, &ri);
- if (hdr_data)
- stbi__float_postprocess(hdr_data,x,y,comp,req_comp);
- return hdr_data;
- }
- #endif
- data = stbi__load_and_postprocess_8bit(s, x, y, comp, req_comp);
- if (data)
- return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
- return stbi__errpf("unknown image type", "Image not of any known type, or corrupt");
+ unsigned char *data;
+#ifndef STBI_NO_HDR
+ if (stbi__hdr_test(s)) {
+ stbi__result_info ri;
+ float *hdr_data = stbi__hdr_load(s, x, y, comp, req_comp, &ri);
+ if (hdr_data)
+ stbi__float_postprocess(hdr_data, x, y, comp, req_comp);
+ return hdr_data;
+ }
+#endif
+ data = stbi__load_and_postprocess_8bit(s, x, y, comp, req_comp);
+ if (data)
+ return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
+ return stbi__errpf("unknown image type",
+ "Image not of any known type, or corrupt");
}
-STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
+STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x,
+ int *y, int *comp, int req_comp)
{
- stbi__context s;
- stbi__start_mem(&s,buffer,len);
- return stbi__loadf_main(&s,x,y,comp,req_comp);
+ stbi__context s;
+ stbi__start_mem(&s, buffer, len);
+ return stbi__loadf_main(&s, x, y, comp, req_comp);
}
-STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
+STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk,
+ void *user, int *x, int *y, int *comp,
+ int req_comp)
{
- stbi__context s;
- stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
- return stbi__loadf_main(&s,x,y,comp,req_comp);
+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user);
+ return stbi__loadf_main(&s, x, y, comp, req_comp);
}
#ifndef STBI_NO_STDIO
-STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp)
+STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp,
+ int req_comp)
{
- float *result;
- FILE *f = stbi__fopen(filename, "rb");
- if (!f) return stbi__errpf("can't fopen", "Unable to open file");
- result = stbi_loadf_from_file(f,x,y,comp,req_comp);
- fclose(f);
- return result;
+ float *result;
+ FILE *f = stbi__fopen(filename, "rb");
+ if (!f)
+ return stbi__errpf("can't fopen", "Unable to open file");
+ result = stbi_loadf_from_file(f, x, y, comp, req_comp);
+ fclose(f);
+ return result;
}
-STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
+STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp,
+ int req_comp)
{
- stbi__context s;
- stbi__start_file(&s,f);
- return stbi__loadf_main(&s,x,y,comp,req_comp);
+ stbi__context s;
+ stbi__start_file(&s, f);
+ return stbi__loadf_main(&s, x, y, comp, req_comp);
}
#endif // !STBI_NO_STDIO
@@ -1265,170 +1380,180 @@ STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_
STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len)
{
- #ifndef STBI_NO_HDR
- stbi__context s;
- stbi__start_mem(&s,buffer,len);
- return stbi__hdr_test(&s);
- #else
- STBI_NOTUSED(buffer);
- STBI_NOTUSED(len);
- return 0;
- #endif
+#ifndef STBI_NO_HDR
+ stbi__context s;
+ stbi__start_mem(&s, buffer, len);
+ return stbi__hdr_test(&s);
+#else
+ STBI_NOTUSED(buffer);
+ STBI_NOTUSED(len);
+ return 0;
+#endif
}
#ifndef STBI_NO_STDIO
-STBIDEF int stbi_is_hdr (char const *filename)
+STBIDEF int stbi_is_hdr(char const *filename)
{
- FILE *f = stbi__fopen(filename, "rb");
- int result=0;
- if (f) {
- result = stbi_is_hdr_from_file(f);
- fclose(f);
- }
- return result;
+ FILE *f = stbi__fopen(filename, "rb");
+ int result = 0;
+ if (f) {
+ result = stbi_is_hdr_from_file(f);
+ fclose(f);
+ }
+ return result;
}
-STBIDEF int stbi_is_hdr_from_file(FILE *f)
+STBIDEF int stbi_is_hdr_from_file(FILE *f)
{
- #ifndef STBI_NO_HDR
- stbi__context s;
- stbi__start_file(&s,f);
- return stbi__hdr_test(&s);
- #else
- STBI_NOTUSED(f);
- return 0;
- #endif
+#ifndef STBI_NO_HDR
+ stbi__context s;
+ stbi__start_file(&s, f);
+ return stbi__hdr_test(&s);
+#else
+ STBI_NOTUSED(f);
+ return 0;
+#endif
}
#endif // !STBI_NO_STDIO
-STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user)
+STBIDEF int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk,
+ void *user)
{
- #ifndef STBI_NO_HDR
- stbi__context s;
- stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
- return stbi__hdr_test(&s);
- #else
- STBI_NOTUSED(clbk);
- STBI_NOTUSED(user);
- return 0;
- #endif
+#ifndef STBI_NO_HDR
+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks *)clbk, user);
+ return stbi__hdr_test(&s);
+#else
+ STBI_NOTUSED(clbk);
+ STBI_NOTUSED(user);
+ return 0;
+#endif
}
#ifndef STBI_NO_LINEAR
-static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f;
+static float stbi__l2h_gamma = 2.2f, stbi__l2h_scale = 1.0f;
-STBIDEF void stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; }
-STBIDEF void stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; }
+STBIDEF void stbi_ldr_to_hdr_gamma(float gamma)
+{
+ stbi__l2h_gamma = gamma;
+}
+STBIDEF void stbi_ldr_to_hdr_scale(float scale)
+{
+ stbi__l2h_scale = scale;
+}
#endif
-static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f;
-
-STBIDEF void stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; }
-STBIDEF void stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; }
+static float stbi__h2l_gamma_i = 1.0f / 2.2f, stbi__h2l_scale_i = 1.0f;
+STBIDEF void stbi_hdr_to_ldr_gamma(float gamma)
+{
+ stbi__h2l_gamma_i = 1 / gamma;
+}
+STBIDEF void stbi_hdr_to_ldr_scale(float scale)
+{
+ stbi__h2l_scale_i = 1 / scale;
+}
//////////////////////////////////////////////////////////////////////////////
//
// Common code used by all image loaders
//
-enum
-{
- STBI__SCAN_load=0,
- STBI__SCAN_type,
- STBI__SCAN_header
-};
+enum { STBI__SCAN_load = 0, STBI__SCAN_type, STBI__SCAN_header };
static void stbi__refill_buffer(stbi__context *s)
{
- int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen);
- if (n == 0) {
- // at end of file, treat same as if from memory, but need to handle case
- // where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file
- s->read_from_callbacks = 0;
- s->img_buffer = s->buffer_start;
- s->img_buffer_end = s->buffer_start+1;
- *s->img_buffer = 0;
- } else {
- s->img_buffer = s->buffer_start;
- s->img_buffer_end = s->buffer_start + n;
- }
+ int n = (s->io.read)(s->io_user_data, (char *)s->buffer_start, s->buflen);
+ if (n == 0) {
+ // at end of file, treat same as if from memory, but need to handle case
+ // where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file
+ s->read_from_callbacks = 0;
+ s->img_buffer = s->buffer_start;
+ s->img_buffer_end = s->buffer_start + 1;
+ *s->img_buffer = 0;
+ } else {
+ s->img_buffer = s->buffer_start;
+ s->img_buffer_end = s->buffer_start + n;
+ }
}
stbi_inline static stbi_uc stbi__get8(stbi__context *s)
{
- if (s->img_buffer < s->img_buffer_end)
- return *s->img_buffer++;
- if (s->read_from_callbacks) {
- stbi__refill_buffer(s);
- return *s->img_buffer++;
- }
- return 0;
+ if (s->img_buffer < s->img_buffer_end)
+ return *s->img_buffer++;
+ if (s->read_from_callbacks) {
+ stbi__refill_buffer(s);
+ return *s->img_buffer++;
+ }
+ return 0;
}
stbi_inline static int stbi__at_eof(stbi__context *s)
{
- if (s->io.read) {
- if (!(s->io.eof)(s->io_user_data)) return 0;
- // if feof() is true, check if buffer = end
- // special case: we've only got the special 0 character at the end
- if (s->read_from_callbacks == 0) return 1;
- }
+ if (s->io.read) {
+ if (!(s->io.eof)(s->io_user_data))
+ return 0;
+ // if feof() is true, check if buffer = end
+ // special case: we've only got the special 0 character at the end
+ if (s->read_from_callbacks == 0)
+ return 1;
+ }
- return s->img_buffer >= s->img_buffer_end;
+ return s->img_buffer >= s->img_buffer_end;
}
static void stbi__skip(stbi__context *s, int n)
{
- if (n < 0) {
- s->img_buffer = s->img_buffer_end;
- return;
- }
- if (s->io.read) {
- int blen = (int) (s->img_buffer_end - s->img_buffer);
- if (blen < n) {
- s->img_buffer = s->img_buffer_end;
- (s->io.skip)(s->io_user_data, n - blen);
- return;
- }
- }
- s->img_buffer += n;
+ if (n < 0) {
+ s->img_buffer = s->img_buffer_end;
+ return;
+ }
+ if (s->io.read) {
+ int blen = (int)(s->img_buffer_end - s->img_buffer);
+ if (blen < n) {
+ s->img_buffer = s->img_buffer_end;
+ (s->io.skip)(s->io_user_data, n - blen);
+ return;
+ }
+ }
+ s->img_buffer += n;
}
static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n)
{
- if (s->io.read) {
- int blen = (int) (s->img_buffer_end - s->img_buffer);
- if (blen < n) {
- int res, count;
+ if (s->io.read) {
+ int blen = (int)(s->img_buffer_end - s->img_buffer);
+ if (blen < n) {
+ int res, count;
- memcpy(buffer, s->img_buffer, blen);
+ memcpy(buffer, s->img_buffer, blen);
- count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen);
- res = (count == (n-blen));
- s->img_buffer = s->img_buffer_end;
- return res;
- }
- }
+ count =
+ (s->io.read)(s->io_user_data, (char *)buffer + blen, n - blen);
+ res = (count == (n - blen));
+ s->img_buffer = s->img_buffer_end;
+ return res;
+ }
+ }
- if (s->img_buffer+n <= s->img_buffer_end) {
- memcpy(buffer, s->img_buffer, n);
- s->img_buffer += n;
- return 1;
- } else
- return 0;
+ if (s->img_buffer + n <= s->img_buffer_end) {
+ memcpy(buffer, s->img_buffer, n);
+ s->img_buffer += n;
+ return 1;
+ } else
+ return 0;
}
static int stbi__get16be(stbi__context *s)
{
- int z = stbi__get8(s);
- return (z << 8) + stbi__get8(s);
+ int z = stbi__get8(s);
+ return (z << 8) + stbi__get8(s);
}
static stbi__uint32 stbi__get32be(stbi__context *s)
{
- stbi__uint32 z = stbi__get16be(s);
- return (z << 16) + stbi__get16be(s);
+ stbi__uint32 z = stbi__get16be(s);
+ return (z << 16) + stbi__get16be(s);
}
#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF)
@@ -1436,21 +1561,21 @@ static stbi__uint32 stbi__get32be(stbi__context *s)
#else
static int stbi__get16le(stbi__context *s)
{
- int z = stbi__get8(s);
- return z + (stbi__get8(s) << 8);
+ int z = stbi__get8(s);
+ return z + (stbi__get8(s) << 8);
}
#endif
#ifndef STBI_NO_BMP
static stbi__uint32 stbi__get32le(stbi__context *s)
{
- stbi__uint32 z = stbi__get16le(s);
- return z + (stbi__get16le(s) << 16);
+ stbi__uint32 z = stbi__get16le(s);
+ return z + (stbi__get16le(s) << 16);
}
#endif
-#define STBI__BYTECAST(x) ((stbi_uc) ((x) & 255)) // truncate int to byte without warnings
-
+#define STBI__BYTECAST(x) \
+ ((stbi_uc)((x)&255)) // truncate int to byte without warnings
//////////////////////////////////////////////////////////////////////////////
//
@@ -1465,750 +1590,902 @@ static stbi__uint32 stbi__get32le(stbi__context *s)
static stbi_uc stbi__compute_y(int r, int g, int b)
{
- return (stbi_uc) (((r*77) + (g*150) + (29*b)) >> 8);
-}
-
-static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y)
-{
- int i,j;
- unsigned char *good;
-
- if (req_comp == img_n) return data;
- STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
-
- good = (unsigned char *) stbi__malloc_mad3(req_comp, x, y, 0);
- if (good == NULL) {
- STBI_FREE(data);
- return stbi__errpuc("outofmem", "Out of memory");
- }
-
- for (j=0; j < (int) y; ++j) {
- unsigned char *src = data + j * x * img_n ;
- unsigned char *dest = good + j * x * req_comp;
-
- #define STBI__COMBO(a,b) ((a)*8+(b))
- #define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
- // convert source image with img_n components to one with req_comp components;
- // avoid switch per pixel, so use switch per scanline and massive macros
- switch (STBI__COMBO(img_n, req_comp)) {
- STBI__CASE(1,2) { dest[0]=src[0], dest[1]=255; } break;
- STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break;
- STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; } break;
- STBI__CASE(2,1) { dest[0]=src[0]; } break;
- STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break;
- STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; } break;
- STBI__CASE(3,4) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; } break;
- STBI__CASE(3,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); } break;
- STBI__CASE(3,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = 255; } break;
- STBI__CASE(4,1) { dest[0]=stbi__compute_y(src[0],src[1],src[2]); } break;
- STBI__CASE(4,2) { dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = src[3]; } break;
- STBI__CASE(4,3) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; } break;
- default: STBI_ASSERT(0);
- }
- #undef STBI__CASE
- }
-
- STBI_FREE(data);
- return good;
+ return (stbi_uc)(((r * 77) + (g * 150) + (29 * b)) >> 8);
+}
+
+static unsigned char *stbi__convert_format(unsigned char *data, int img_n,
+ int req_comp, unsigned int x,
+ unsigned int y)
+{
+ int i, j;
+ unsigned char *good;
+
+ if (req_comp == img_n)
+ return data;
+ STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
+
+ good = (unsigned char *)stbi__malloc_mad3(req_comp, x, y, 0);
+ if (good == NULL) {
+ STBI_FREE(data);
+ return stbi__errpuc("outofmem", "Out of memory");
+ }
+
+ for (j = 0; j < (int)y; ++j) {
+ unsigned char *src = data + j * x * img_n;
+ unsigned char *dest = good + j * x * req_comp;
+
+#define STBI__COMBO(a, b) ((a)*8 + (b))
+#define STBI__CASE(a, b) \
+ case STBI__COMBO(a, b): \
+ for (i = x - 1; i >= 0; --i, src += a, dest += b)
+ // convert source image with img_n components to one with req_comp
+ // components; avoid switch per pixel, so use switch per scanline and
+ // massive macros
+ switch (STBI__COMBO(img_n, req_comp)) {
+ STBI__CASE(1, 2) { dest[0] = src[0], dest[1] = 255; }
+ break;
+ STBI__CASE(1, 3) { dest[0] = dest[1] = dest[2] = src[0]; }
+ break;
+ STBI__CASE(1, 4)
+ {
+ dest[0] = dest[1] = dest[2] = src[0], dest[3] = 255;
+ }
+ break;
+ STBI__CASE(2, 1) { dest[0] = src[0]; }
+ break;
+ STBI__CASE(2, 3) { dest[0] = dest[1] = dest[2] = src[0]; }
+ break;
+ STBI__CASE(2, 4)
+ {
+ dest[0] = dest[1] = dest[2] = src[0], dest[3] = src[1];
+ }
+ break;
+ STBI__CASE(3, 4)
+ {
+ dest[0] = src[0], dest[1] = src[1], dest[2] = src[2],
+ dest[3] = 255;
+ }
+ break;
+ STBI__CASE(3, 1)
+ {
+ dest[0] = stbi__compute_y(src[0], src[1], src[2]);
+ }
+ break;
+ STBI__CASE(3, 2)
+ {
+ dest[0] = stbi__compute_y(src[0], src[1], src[2]),
+ dest[1] = 255;
+ }
+ break;
+ STBI__CASE(4, 1)
+ {
+ dest[0] = stbi__compute_y(src[0], src[1], src[2]);
+ }
+ break;
+ STBI__CASE(4, 2)
+ {
+ dest[0] = stbi__compute_y(src[0], src[1], src[2]),
+ dest[1] = src[3];
+ }
+ break;
+ STBI__CASE(4, 3)
+ {
+ dest[0] = src[0], dest[1] = src[1], dest[2] = src[2];
+ }
+ break;
+ default:
+ STBI_ASSERT(0);
+ }
+#undef STBI__CASE
+ }
+
+ STBI_FREE(data);
+ return good;
}
static stbi__uint16 stbi__compute_y_16(int r, int g, int b)
{
- return (stbi__uint16) (((r*77) + (g*150) + (29*b)) >> 8);
-}
-
-static stbi__uint16 *stbi__convert_format16(stbi__uint16 *data, int img_n, int req_comp, unsigned int x, unsigned int y)
-{
- int i,j;
- stbi__uint16 *good;
-
- if (req_comp == img_n) return data;
- STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
-
- good = (stbi__uint16 *) stbi__malloc(req_comp * x * y * 2);
- if (good == NULL) {
- STBI_FREE(data);
- return (stbi__uint16 *) stbi__errpuc("outofmem", "Out of memory");
- }
-
- for (j=0; j < (int) y; ++j) {
- stbi__uint16 *src = data + j * x * img_n ;
- stbi__uint16 *dest = good + j * x * req_comp;
-
- #define STBI__COMBO(a,b) ((a)*8+(b))
- #define STBI__CASE(a,b) case STBI__COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
- // convert source image with img_n components to one with req_comp components;
- // avoid switch per pixel, so use switch per scanline and massive macros
- switch (STBI__COMBO(img_n, req_comp)) {
- STBI__CASE(1,2) { dest[0]=src[0], dest[1]=0xffff; } break;
- STBI__CASE(1,3) { dest[0]=dest[1]=dest[2]=src[0]; } break;
- STBI__CASE(1,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=0xffff; } break;
- STBI__CASE(2,1) { dest[0]=src[0]; } break;
- STBI__CASE(2,3) { dest[0]=dest[1]=dest[2]=src[0]; } break;
- STBI__CASE(2,4) { dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; } break;
- STBI__CASE(3,4) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=0xffff; } break;
- STBI__CASE(3,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); } break;
- STBI__CASE(3,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]), dest[1] = 0xffff; } break;
- STBI__CASE(4,1) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]); } break;
- STBI__CASE(4,2) { dest[0]=stbi__compute_y_16(src[0],src[1],src[2]), dest[1] = src[3]; } break;
- STBI__CASE(4,3) { dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; } break;
- default: STBI_ASSERT(0);
- }
- #undef STBI__CASE
- }
-
- STBI_FREE(data);
- return good;
+ return (stbi__uint16)(((r * 77) + (g * 150) + (29 * b)) >> 8);
+}
+
+static stbi__uint16 *stbi__convert_format16(stbi__uint16 *data, int img_n,
+ int req_comp, unsigned int x,
+ unsigned int y)
+{
+ int i, j;
+ stbi__uint16 *good;
+
+ if (req_comp == img_n)
+ return data;
+ STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
+
+ good = (stbi__uint16 *)stbi__malloc(req_comp * x * y * 2);
+ if (good == NULL) {
+ STBI_FREE(data);
+ return (stbi__uint16 *)stbi__errpuc("outofmem", "Out of memory");
+ }
+
+ for (j = 0; j < (int)y; ++j) {
+ stbi__uint16 *src = data + j * x * img_n;
+ stbi__uint16 *dest = good + j * x * req_comp;
+
+#define STBI__COMBO(a, b) ((a)*8 + (b))
+#define STBI__CASE(a, b) \
+ case STBI__COMBO(a, b): \
+ for (i = x - 1; i >= 0; --i, src += a, dest += b)
+ // convert source image with img_n components to one with req_comp
+ // components; avoid switch per pixel, so use switch per scanline and
+ // massive macros
+ switch (STBI__COMBO(img_n, req_comp)) {
+ STBI__CASE(1, 2) { dest[0] = src[0], dest[1] = 0xffff; }
+ break;
+ STBI__CASE(1, 3) { dest[0] = dest[1] = dest[2] = src[0]; }
+ break;
+ STBI__CASE(1, 4)
+ {
+ dest[0] = dest[1] = dest[2] = src[0], dest[3] = 0xffff;
+ }
+ break;
+ STBI__CASE(2, 1) { dest[0] = src[0]; }
+ break;
+ STBI__CASE(2, 3) { dest[0] = dest[1] = dest[2] = src[0]; }
+ break;
+ STBI__CASE(2, 4)
+ {
+ dest[0] = dest[1] = dest[2] = src[0], dest[3] = src[1];
+ }
+ break;
+ STBI__CASE(3, 4)
+ {
+ dest[0] = src[0], dest[1] = src[1], dest[2] = src[2],
+ dest[3] = 0xffff;
+ }
+ break;
+ STBI__CASE(3, 1)
+ {
+ dest[0] = stbi__compute_y_16(src[0], src[1], src[2]);
+ }
+ break;
+ STBI__CASE(3, 2)
+ {
+ dest[0] = stbi__compute_y_16(src[0], src[1], src[2]),
+ dest[1] = 0xffff;
+ }
+ break;
+ STBI__CASE(4, 1)
+ {
+ dest[0] = stbi__compute_y_16(src[0], src[1], src[2]);
+ }
+ break;
+ STBI__CASE(4, 2)
+ {
+ dest[0] = stbi__compute_y_16(src[0], src[1], src[2]),
+ dest[1] = src[3];
+ }
+ break;
+ STBI__CASE(4, 3)
+ {
+ dest[0] = src[0], dest[1] = src[1], dest[2] = src[2];
+ }
+ break;
+ default:
+ STBI_ASSERT(0);
+ }
+#undef STBI__CASE
+ }
+
+ STBI_FREE(data);
+ return good;
}
#ifndef STBI_NO_LINEAR
-static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp)
-{
- int i,k,n;
- float *output;
- if (!data) return NULL;
- output = (float *) stbi__malloc_mad4(x, y, comp, sizeof(float), 0);
- if (output == NULL) { STBI_FREE(data); return stbi__errpf("outofmem", "Out of memory"); }
- // compute number of non-alpha components
- if (comp & 1) n = comp; else n = comp-1;
- for (i=0; i < x*y; ++i) {
- for (k=0; k < n; ++k) {
- output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, stbi__l2h_gamma) * stbi__l2h_scale);
- }
- if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f;
- }
- STBI_FREE(data);
- return output;
+static float *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp)
+{
+ int i, k, n;
+ float *output;
+ if (!data)
+ return NULL;
+ output = (float *)stbi__malloc_mad4(x, y, comp, sizeof(float), 0);
+ if (output == NULL) {
+ STBI_FREE(data);
+ return stbi__errpf("outofmem", "Out of memory");
+ }
+ // compute number of non-alpha components
+ if (comp & 1)
+ n = comp;
+ else
+ n = comp - 1;
+ for (i = 0; i < x * y; ++i) {
+ for (k = 0; k < n; ++k) {
+ output[i * comp + k] =
+ (float)(pow(data[i * comp + k] / 255.0f, stbi__l2h_gamma) *
+ stbi__l2h_scale);
+ }
+ if (k < comp)
+ output[i * comp + k] = data[i * comp + k] / 255.0f;
+ }
+ STBI_FREE(data);
+ return output;
}
#endif
#ifndef STBI_NO_HDR
-#define stbi__float2int(x) ((int) (x))
-static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp)
-{
- int i,k,n;
- stbi_uc *output;
- if (!data) return NULL;
- output = (stbi_uc *) stbi__malloc_mad3(x, y, comp, 0);
- if (output == NULL) { STBI_FREE(data); return stbi__errpuc("outofmem", "Out of memory"); }
- // compute number of non-alpha components
- if (comp & 1) n = comp; else n = comp-1;
- for (i=0; i < x*y; ++i) {
- for (k=0; k < n; ++k) {
- float z = (float) pow(data[i*comp+k]*stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f;
- if (z < 0) z = 0;
- if (z > 255) z = 255;
- output[i*comp + k] = (stbi_uc) stbi__float2int(z);
- }
- if (k < comp) {
- float z = data[i*comp+k] * 255 + 0.5f;
- if (z < 0) z = 0;
- if (z > 255) z = 255;
- output[i*comp + k] = (stbi_uc) stbi__float2int(z);
- }
- }
- STBI_FREE(data);
- return output;
+#define stbi__float2int(x) ((int)(x))
+static stbi_uc *stbi__hdr_to_ldr(float *data, int x, int y, int comp)
+{
+ int i, k, n;
+ stbi_uc *output;
+ if (!data)
+ return NULL;
+ output = (stbi_uc *)stbi__malloc_mad3(x, y, comp, 0);
+ if (output == NULL) {
+ STBI_FREE(data);
+ return stbi__errpuc("outofmem", "Out of memory");
+ }
+ // compute number of non-alpha components
+ if (comp & 1)
+ n = comp;
+ else
+ n = comp - 1;
+ for (i = 0; i < x * y; ++i) {
+ for (k = 0; k < n; ++k) {
+ float z = (float)pow(data[i * comp + k] * stbi__h2l_scale_i,
+ stbi__h2l_gamma_i) *
+ 255 +
+ 0.5f;
+ if (z < 0)
+ z = 0;
+ if (z > 255)
+ z = 255;
+ output[i * comp + k] = (stbi_uc)stbi__float2int(z);
+ }
+ if (k < comp) {
+ float z = data[i * comp + k] * 255 + 0.5f;
+ if (z < 0)
+ z = 0;
+ if (z > 255)
+ z = 255;
+ output[i * comp + k] = (stbi_uc)stbi__float2int(z);
+ }
+ }
+ STBI_FREE(data);
+ return output;
}
#endif
-//////////////////////////////////////////////////////////////////////////////
-//
-// "baseline" JPEG/JFIF decoder
-//
-// simple implementation
-// - doesn't support delayed output of y-dimension
-// - simple interface (only one output format: 8-bit interleaved RGB)
-// - doesn't try to recover corrupt jpegs
-// - doesn't allow partial loading, loading multiple at once
-// - still fast on x86 (copying globals into locals doesn't help x86)
-// - allocates lots of intermediate memory (full size of all components)
-// - non-interleaved case requires this anyway
-// - allows good upsampling (see next)
-// high-quality
-// - upsampled channels are bilinearly interpolated, even across blocks
-// - quality integer IDCT derived from IJG's 'slow'
-// performance
-// - fast huffman; reasonable integer IDCT
-// - some SIMD kernels for common paths on targets with SSE2/NEON
-// - uses a lot of intermediate memory, could cache poorly
+ //////////////////////////////////////////////////////////////////////////////
+ //
+ // "baseline" JPEG/JFIF decoder
+ //
+ // simple implementation
+ // - doesn't support delayed output of y-dimension
+ // - simple interface (only one output format: 8-bit interleaved RGB)
+ // - doesn't try to recover corrupt jpegs
+ // - doesn't allow partial loading, loading multiple at once
+ // - still fast on x86 (copying globals into locals doesn't help x86)
+ // - allocates lots of intermediate memory (full size of all
+ // components)
+ // - non-interleaved case requires this anyway
+ // - allows good upsampling (see next)
+ // high-quality
+ // - upsampled channels are bilinearly interpolated, even across blocks
+ // - quality integer IDCT derived from IJG's 'slow'
+ // performance
+ // - fast huffman; reasonable integer IDCT
+ // - some SIMD kernels for common paths on targets with SSE2/NEON
+ // - uses a lot of intermediate memory, could cache poorly
#ifndef STBI_NO_JPEG
// huffman decoding acceleration
-#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache
-
-typedef struct
-{
- stbi_uc fast[1 << FAST_BITS];
- // weirdly, repacking this into AoS is a 10% speed loss, instead of a win
- stbi__uint16 code[256];
- stbi_uc values[256];
- stbi_uc size[257];
- unsigned int maxcode[18];
- int delta[17]; // old 'firstsymbol' - old 'firstcode'
+#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache
+
+typedef struct {
+ stbi_uc fast[1 << FAST_BITS];
+ // weirdly, repacking this into AoS is a 10% speed loss, instead of a win
+ stbi__uint16 code[256];
+ stbi_uc values[256];
+ stbi_uc size[257];
+ unsigned int maxcode[18];
+ int delta[17]; // old 'firstsymbol' - old 'firstcode'
} stbi__huffman;
-typedef struct
-{
- stbi__context *s;
- stbi__huffman huff_dc[4];
- stbi__huffman huff_ac[4];
- stbi__uint16 dequant[4][64];
- stbi__int16 fast_ac[4][1 << FAST_BITS];
-
-// sizes for components, interleaved MCUs
- int img_h_max, img_v_max;
- int img_mcu_x, img_mcu_y;
- int img_mcu_w, img_mcu_h;
-
-// definition of jpeg image component
- struct
- {
- int id;
- int h,v;
- int tq;
- int hd,ha;
- int dc_pred;
-
- int x,y,w2,h2;
- stbi_uc *data;
- void *raw_data, *raw_coeff;
- stbi_uc *linebuf;
- short *coeff; // progressive only
- int coeff_w, coeff_h; // number of 8x8 coefficient blocks
- } img_comp[4];
-
- stbi__uint32 code_buffer; // jpeg entropy-coded buffer
- int code_bits; // number of valid bits
- unsigned char marker; // marker seen while filling entropy buffer
- int nomore; // flag if we saw a marker so must stop
-
- int progressive;
- int spec_start;
- int spec_end;
- int succ_high;
- int succ_low;
- int eob_run;
- int jfif;
- int app14_color_transform; // Adobe APP14 tag
- int rgb;
-
- int scan_n, order[4];
- int restart_interval, todo;
-
-// kernels
- void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]);
- void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step);
- stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs);
+typedef struct {
+ stbi__context *s;
+ stbi__huffman huff_dc[4];
+ stbi__huffman huff_ac[4];
+ stbi__uint16 dequant[4][64];
+ stbi__int16 fast_ac[4][1 << FAST_BITS];
+
+ // sizes for components, interleaved MCUs
+ int img_h_max, img_v_max;
+ int img_mcu_x, img_mcu_y;
+ int img_mcu_w, img_mcu_h;
+
+ // definition of jpeg image component
+ struct {
+ int id;
+ int h, v;
+ int tq;
+ int hd, ha;
+ int dc_pred;
+
+ int x, y, w2, h2;
+ stbi_uc *data;
+ void *raw_data, *raw_coeff;
+ stbi_uc *linebuf;
+ short *coeff; // progressive only
+ int coeff_w, coeff_h; // number of 8x8 coefficient blocks
+ } img_comp[4];
+
+ stbi__uint32 code_buffer; // jpeg entropy-coded buffer
+ int code_bits; // number of valid bits
+ unsigned char marker; // marker seen while filling entropy buffer
+ int nomore; // flag if we saw a marker so must stop
+
+ int progressive;
+ int spec_start;
+ int spec_end;
+ int succ_high;
+ int succ_low;
+ int eob_run;
+ int jfif;
+ int app14_color_transform; // Adobe APP14 tag
+ int rgb;
+
+ int scan_n, order[4];
+ int restart_interval, todo;
+
+ // kernels
+ void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]);
+ void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y,
+ const stbi_uc *pcb, const stbi_uc *pcr,
+ int count, int step);
+ stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near,
+ stbi_uc *in_far, int w, int hs);
} stbi__jpeg;
static int stbi__build_huffman(stbi__huffman *h, int *count)
{
- int i,j,k=0,code;
- // build size list for each symbol (from JPEG spec)
- for (i=0; i < 16; ++i)
- for (j=0; j < count[i]; ++j)
- h->size[k++] = (stbi_uc) (i+1);
- h->size[k] = 0;
-
- // compute actual symbols (from jpeg spec)
- code = 0;
- k = 0;
- for(j=1; j <= 16; ++j) {
- // compute delta to add to code to compute symbol id
- h->delta[j] = k - code;
- if (h->size[k] == j) {
- while (h->size[k] == j)
- h->code[k++] = (stbi__uint16) (code++);
- if (code-1 >= (1 << j)) return stbi__err("bad code lengths","Corrupt JPEG");
- }
- // compute largest code + 1 for this size, preshifted as needed later
- h->maxcode[j] = code << (16-j);
- code <<= 1;
- }
- h->maxcode[j] = 0xffffffff;
-
- // build non-spec acceleration table; 255 is flag for not-accelerated
- memset(h->fast, 255, 1 << FAST_BITS);
- for (i=0; i < k; ++i) {
- int s = h->size[i];
- if (s <= FAST_BITS) {
- int c = h->code[i] << (FAST_BITS-s);
- int m = 1 << (FAST_BITS-s);
- for (j=0; j < m; ++j) {
- h->fast[c+j] = (stbi_uc) i;
- }
- }
- }
- return 1;
+ int i, j, k = 0, code;
+ // build size list for each symbol (from JPEG spec)
+ for (i = 0; i < 16; ++i)
+ for (j = 0; j < count[i]; ++j)
+ h->size[k++] = (stbi_uc)(i + 1);
+ h->size[k] = 0;
+
+ // compute actual symbols (from jpeg spec)
+ code = 0;
+ k = 0;
+ for (j = 1; j <= 16; ++j) {
+ // compute delta to add to code to compute symbol id
+ h->delta[j] = k - code;
+ if (h->size[k] == j) {
+ while (h->size[k] == j)
+ h->code[k++] = (stbi__uint16)(code++);
+ if (code - 1 >= (1 << j))
+ return stbi__err("bad code lengths", "Corrupt JPEG");
+ }
+ // compute largest code + 1 for this size, preshifted as needed later
+ h->maxcode[j] = code << (16 - j);
+ code <<= 1;
+ }
+ h->maxcode[j] = 0xffffffff;
+
+ // build non-spec acceleration table; 255 is flag for not-accelerated
+ memset(h->fast, 255, 1 << FAST_BITS);
+ for (i = 0; i < k; ++i) {
+ int s = h->size[i];
+ if (s <= FAST_BITS) {
+ int c = h->code[i] << (FAST_BITS - s);
+ int m = 1 << (FAST_BITS - s);
+ for (j = 0; j < m; ++j) {
+ h->fast[c + j] = (stbi_uc)i;
+ }
+ }
+ }
+ return 1;
}
// build a table that decodes both magnitude and value of small ACs in
// one go.
static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h)
{
- int i;
- for (i=0; i < (1 << FAST_BITS); ++i) {
- stbi_uc fast = h->fast[i];
- fast_ac[i] = 0;
- if (fast < 255) {
- int rs = h->values[fast];
- int run = (rs >> 4) & 15;
- int magbits = rs & 15;
- int len = h->size[fast];
-
- if (magbits && len + magbits <= FAST_BITS) {
- // magnitude code followed by receive_extend code
- int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits);
- int m = 1 << (magbits - 1);
- if (k < m) k += (~0U << magbits) + 1;
- // if the result is small enough, we can fit it in fast_ac table
- if (k >= -128 && k <= 127)
- fast_ac[i] = (stbi__int16) ((k << 8) + (run << 4) + (len + magbits));
- }
- }
- }
+ int i;
+ for (i = 0; i < (1 << FAST_BITS); ++i) {
+ stbi_uc fast = h->fast[i];
+ fast_ac[i] = 0;
+ if (fast < 255) {
+ int rs = h->values[fast];
+ int run = (rs >> 4) & 15;
+ int magbits = rs & 15;
+ int len = h->size[fast];
+
+ if (magbits && len + magbits <= FAST_BITS) {
+ // magnitude code followed by receive_extend code
+ int k = ((i << len) & ((1 << FAST_BITS) - 1)) >>
+ (FAST_BITS - magbits);
+ int m = 1 << (magbits - 1);
+ if (k < m)
+ k += (~0U << magbits) + 1;
+ // if the result is small enough, we can fit it in fast_ac table
+ if (k >= -128 && k <= 127)
+ fast_ac[i] =
+ (stbi__int16)((k << 8) + (run << 4) + (len + magbits));
+ }
+ }
+ }
}
static void stbi__grow_buffer_unsafe(stbi__jpeg *j)
{
- do {
- int b = j->nomore ? 0 : stbi__get8(j->s);
- if (b == 0xff) {
- int c = stbi__get8(j->s);
- while (c == 0xff) c = stbi__get8(j->s); // consume fill bytes
- if (c != 0) {
- j->marker = (unsigned char) c;
- j->nomore = 1;
- return;
- }
- }
- j->code_buffer |= b << (24 - j->code_bits);
- j->code_bits += 8;
- } while (j->code_bits <= 24);
+ do {
+ int b = j->nomore ? 0 : stbi__get8(j->s);
+ if (b == 0xff) {
+ int c = stbi__get8(j->s);
+ while (c == 0xff)
+ c = stbi__get8(j->s); // consume fill bytes
+ if (c != 0) {
+ j->marker = (unsigned char)c;
+ j->nomore = 1;
+ return;
+ }
+ }
+ j->code_buffer |= b << (24 - j->code_bits);
+ j->code_bits += 8;
+ } while (j->code_bits <= 24);
}
// (1 << n) - 1
-static stbi__uint32 stbi__bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535};
+static stbi__uint32 stbi__bmask[17] = {0, 1, 3, 7, 15, 31,
+ 63, 127, 255, 511, 1023, 2047,
+ 4095, 8191, 16383, 32767, 65535};
// decode a jpeg huffman value from the bitstream
stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h)
{
- unsigned int temp;
- int c,k;
-
- if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
-
- // look at the top FAST_BITS and determine what symbol ID it is,
- // if the code is <= FAST_BITS
- c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
- k = h->fast[c];
- if (k < 255) {
- int s = h->size[k];
- if (s > j->code_bits)
- return -1;
- j->code_buffer <<= s;
- j->code_bits -= s;
- return h->values[k];
- }
-
- // naive test is to shift the code_buffer down so k bits are
- // valid, then test against maxcode. To speed this up, we've
- // preshifted maxcode left so that it has (16-k) 0s at the
- // end; in other words, regardless of the number of bits, it
- // wants to be compared against something shifted to have 16;
- // that way we don't need to shift inside the loop.
- temp = j->code_buffer >> 16;
- for (k=FAST_BITS+1 ; ; ++k)
- if (temp < h->maxcode[k])
- break;
- if (k == 17) {
- // error! code not found
- j->code_bits -= 16;
- return -1;
- }
-
- if (k > j->code_bits)
- return -1;
-
- // convert the huffman code to the symbol id
- c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k];
- STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]);
-
- // convert the id to a symbol
- j->code_bits -= k;
- j->code_buffer <<= k;
- return h->values[c];
+ unsigned int temp;
+ int c, k;
+
+ if (j->code_bits < 16)
+ stbi__grow_buffer_unsafe(j);
+
+ // look at the top FAST_BITS and determine what symbol ID it is,
+ // if the code is <= FAST_BITS
+ c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS) - 1);
+ k = h->fast[c];
+ if (k < 255) {
+ int s = h->size[k];
+ if (s > j->code_bits)
+ return -1;
+ j->code_buffer <<= s;
+ j->code_bits -= s;
+ return h->values[k];
+ }
+
+ // naive test is to shift the code_buffer down so k bits are
+ // valid, then test against maxcode. To speed this up, we've
+ // preshifted maxcode left so that it has (16-k) 0s at the
+ // end; in other words, regardless of the number of bits, it
+ // wants to be compared against something shifted to have 16;
+ // that way we don't need to shift inside the loop.
+ temp = j->code_buffer >> 16;
+ for (k = FAST_BITS + 1;; ++k)
+ if (temp < h->maxcode[k])
+ break;
+ if (k == 17) {
+ // error! code not found
+ j->code_bits -= 16;
+ return -1;
+ }
+
+ if (k > j->code_bits)
+ return -1;
+
+ // convert the huffman code to the symbol id
+ c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k];
+ STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) &
+ stbi__bmask[h->size[c]]) == h->code[c]);
+
+ // convert the id to a symbol
+ j->code_bits -= k;
+ j->code_buffer <<= k;
+ return h->values[c];
}
// bias[n] = (-1<<n) + 1
-static int const stbi__jbias[16] = {0,-1,-3,-7,-15,-31,-63,-127,-255,-511,-1023,-2047,-4095,-8191,-16383,-32767};
+static int const stbi__jbias[16] = {0, -1, -3, -7, -15, -31,
+ -63, -127, -255, -511, -1023, -2047,
+ -4095, -8191, -16383, -32767};
// combined JPEG 'receive' and JPEG 'extend', since baseline
// always extends everything it receives.
stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n)
{
- unsigned int k;
- int sgn;
- if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
+ unsigned int k;
+ int sgn;
+ if (j->code_bits < n)
+ stbi__grow_buffer_unsafe(j);
- sgn = (stbi__int32)j->code_buffer >> 31; // sign bit is always in MSB
- k = stbi_lrot(j->code_buffer, n);
- STBI_ASSERT(n >= 0 && n < (int) (sizeof(stbi__bmask)/sizeof(*stbi__bmask)));
- j->code_buffer = k & ~stbi__bmask[n];
- k &= stbi__bmask[n];
- j->code_bits -= n;
- return k + (stbi__jbias[n] & ~sgn);
+ sgn = (stbi__int32)j->code_buffer >> 31; // sign bit is always in MSB
+ k = stbi_lrot(j->code_buffer, n);
+ STBI_ASSERT(n >= 0 &&
+ n < (int)(sizeof(stbi__bmask) / sizeof(*stbi__bmask)));
+ j->code_buffer = k & ~stbi__bmask[n];
+ k &= stbi__bmask[n];
+ j->code_bits -= n;
+ return k + (stbi__jbias[n] & ~sgn);
}
// get some unsigned bits
stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n)
{
- unsigned int k;
- if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
- k = stbi_lrot(j->code_buffer, n);
- j->code_buffer = k & ~stbi__bmask[n];
- k &= stbi__bmask[n];
- j->code_bits -= n;
- return k;
+ unsigned int k;
+ if (j->code_bits < n)
+ stbi__grow_buffer_unsafe(j);
+ k = stbi_lrot(j->code_buffer, n);
+ j->code_buffer = k & ~stbi__bmask[n];
+ k &= stbi__bmask[n];
+ j->code_bits -= n;
+ return k;
}
stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j)
{
- unsigned int k;
- if (j->code_bits < 1) stbi__grow_buffer_unsafe(j);
- k = j->code_buffer;
- j->code_buffer <<= 1;
- --j->code_bits;
- return k & 0x80000000;
+ unsigned int k;
+ if (j->code_bits < 1)
+ stbi__grow_buffer_unsafe(j);
+ k = j->code_buffer;
+ j->code_buffer <<= 1;
+ --j->code_bits;
+ return k & 0x80000000;
}
// given a value that's at position X in the zigzag stream,
// where does it appear in the 8x8 matrix coded as row-major?
-static stbi_uc stbi__jpeg_dezigzag[64+15] =
-{
- 0, 1, 8, 16, 9, 2, 3, 10,
- 17, 24, 32, 25, 18, 11, 4, 5,
- 12, 19, 26, 33, 40, 48, 41, 34,
- 27, 20, 13, 6, 7, 14, 21, 28,
- 35, 42, 49, 56, 57, 50, 43, 36,
- 29, 22, 15, 23, 30, 37, 44, 51,
- 58, 59, 52, 45, 38, 31, 39, 46,
- 53, 60, 61, 54, 47, 55, 62, 63,
- // let corrupt input sample past end
- 63, 63, 63, 63, 63, 63, 63, 63,
- 63, 63, 63, 63, 63, 63, 63
-};
+static stbi_uc stbi__jpeg_dezigzag[64 + 15] = {
+ 0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, 12, 19, 26, 33, 40,
+ 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28, 35, 42, 49, 56, 57, 50, 43, 36,
+ 29, 22, 15, 23, 30, 37, 44, 51, 58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61,
+ 54, 47, 55, 62, 63,
+ // let corrupt input sample past end
+ 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63, 63};
// decode one 64-entry block--
-static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi__uint16 *dequant)
-{
- int diff,dc,k;
- int t;
-
- if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
- t = stbi__jpeg_huff_decode(j, hdc);
- if (t < 0) return stbi__err("bad huffman code","Corrupt JPEG");
-
- // 0 all the ac values now so we can do it 32-bits at a time
- memset(data,0,64*sizeof(data[0]));
-
- diff = t ? stbi__extend_receive(j, t) : 0;
- dc = j->img_comp[b].dc_pred + diff;
- j->img_comp[b].dc_pred = dc;
- data[0] = (short) (dc * dequant[0]);
-
- // decode AC components, see JPEG spec
- k = 1;
- do {
- unsigned int zig;
- int c,r,s;
- if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
- c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
- r = fac[c];
- if (r) { // fast-AC path
- k += (r >> 4) & 15; // run
- s = r & 15; // combined length
- j->code_buffer <<= s;
- j->code_bits -= s;
- // decode into unzigzag'd location
- zig = stbi__jpeg_dezigzag[k++];
- data[zig] = (short) ((r >> 8) * dequant[zig]);
- } else {
- int rs = stbi__jpeg_huff_decode(j, hac);
- if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
- s = rs & 15;
- r = rs >> 4;
- if (s == 0) {
- if (rs != 0xf0) break; // end block
- k += 16;
- } else {
- k += r;
+static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64],
+ stbi__huffman *hdc, stbi__huffman *hac,
+ stbi__int16 *fac, int b,
+ stbi__uint16 *dequant)
+{
+ int diff, dc, k;
+ int t;
+
+ if (j->code_bits < 16)
+ stbi__grow_buffer_unsafe(j);
+ t = stbi__jpeg_huff_decode(j, hdc);
+ if (t < 0)
+ return stbi__err("bad huffman code", "Corrupt JPEG");
+
+ // 0 all the ac values now so we can do it 32-bits at a time
+ memset(data, 0, 64 * sizeof(data[0]));
+
+ diff = t ? stbi__extend_receive(j, t) : 0;
+ dc = j->img_comp[b].dc_pred + diff;
+ j->img_comp[b].dc_pred = dc;
+ data[0] = (short)(dc * dequant[0]);
+
+ // decode AC components, see JPEG spec
+ k = 1;
+ do {
+ unsigned int zig;
+ int c, r, s;
+ if (j->code_bits < 16)
+ stbi__grow_buffer_unsafe(j);
+ c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS) - 1);
+ r = fac[c];
+ if (r) { // fast-AC path
+ k += (r >> 4) & 15; // run
+ s = r & 15; // combined length
+ j->code_buffer <<= s;
+ j->code_bits -= s;
// decode into unzigzag'd location
- zig = stbi__jpeg_dezigzag[k++];
- data[zig] = (short) (stbi__extend_receive(j,s) * dequant[zig]);
- }
- }
- } while (k < 64);
- return 1;
+ zig = stbi__jpeg_dezigzag[k++];
+ data[zig] = (short)((r >> 8) * dequant[zig]);
+ } else {
+ int rs = stbi__jpeg_huff_decode(j, hac);
+ if (rs < 0)
+ return stbi__err("bad huffman code", "Corrupt JPEG");
+ s = rs & 15;
+ r = rs >> 4;
+ if (s == 0) {
+ if (rs != 0xf0)
+ break; // end block
+ k += 16;
+ } else {
+ k += r;
+ // decode into unzigzag'd location
+ zig = stbi__jpeg_dezigzag[k++];
+ data[zig] = (short)(stbi__extend_receive(j, s) * dequant[zig]);
+ }
+ }
+ } while (k < 64);
+ return 1;
}
-static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc, int b)
+static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64],
+ stbi__huffman *hdc, int b)
{
- int diff,dc;
- int t;
- if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+ int diff, dc;
+ int t;
+ if (j->spec_end != 0)
+ return stbi__err("can't merge dc and ac", "Corrupt JPEG");
- if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+ if (j->code_bits < 16)
+ stbi__grow_buffer_unsafe(j);
- if (j->succ_high == 0) {
- // first scan for DC coefficient, must be first
- memset(data,0,64*sizeof(data[0])); // 0 all the ac values now
- t = stbi__jpeg_huff_decode(j, hdc);
- diff = t ? stbi__extend_receive(j, t) : 0;
+ if (j->succ_high == 0) {
+ // first scan for DC coefficient, must be first
+ memset(data, 0, 64 * sizeof(data[0])); // 0 all the ac values now
+ t = stbi__jpeg_huff_decode(j, hdc);
+ diff = t ? stbi__extend_receive(j, t) : 0;
- dc = j->img_comp[b].dc_pred + diff;
- j->img_comp[b].dc_pred = dc;
- data[0] = (short) (dc << j->succ_low);
- } else {
- // refinement scan for DC coefficient
- if (stbi__jpeg_get_bit(j))
- data[0] += (short) (1 << j->succ_low);
- }
- return 1;
+ dc = j->img_comp[b].dc_pred + diff;
+ j->img_comp[b].dc_pred = dc;
+ data[0] = (short)(dc << j->succ_low);
+ } else {
+ // refinement scan for DC coefficient
+ if (stbi__jpeg_get_bit(j))
+ data[0] += (short)(1 << j->succ_low);
+ }
+ return 1;
}
// @OPTIMIZE: store non-zigzagged during the decode passes,
// and only de-zigzag when dequantizing
-static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, stbi__int16 *fac)
-{
- int k;
- if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
-
- if (j->succ_high == 0) {
- int shift = j->succ_low;
-
- if (j->eob_run) {
- --j->eob_run;
- return 1;
- }
-
- k = j->spec_start;
- do {
- unsigned int zig;
- int c,r,s;
- if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
- c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
- r = fac[c];
- if (r) { // fast-AC path
- k += (r >> 4) & 15; // run
- s = r & 15; // combined length
- j->code_buffer <<= s;
- j->code_bits -= s;
- zig = stbi__jpeg_dezigzag[k++];
- data[zig] = (short) ((r >> 8) << shift);
- } else {
- int rs = stbi__jpeg_huff_decode(j, hac);
- if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
- s = rs & 15;
- r = rs >> 4;
- if (s == 0) {
- if (r < 15) {
- j->eob_run = (1 << r);
- if (r)
- j->eob_run += stbi__jpeg_get_bits(j, r);
- --j->eob_run;
- break;
- }
- k += 16;
- } else {
- k += r;
- zig = stbi__jpeg_dezigzag[k++];
- data[zig] = (short) (stbi__extend_receive(j,s) << shift);
- }
- }
- } while (k <= j->spec_end);
- } else {
- // refinement scan for these AC coefficients
-
- short bit = (short) (1 << j->succ_low);
-
- if (j->eob_run) {
- --j->eob_run;
- for (k = j->spec_start; k <= j->spec_end; ++k) {
- short *p = &data[stbi__jpeg_dezigzag[k]];
- if (*p != 0)
- if (stbi__jpeg_get_bit(j))
- if ((*p & bit)==0) {
- if (*p > 0)
- *p += bit;
- else
- *p -= bit;
- }
- }
- } else {
- k = j->spec_start;
- do {
- int r,s;
- int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh
- if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
- s = rs & 15;
- r = rs >> 4;
- if (s == 0) {
- if (r < 15) {
- j->eob_run = (1 << r) - 1;
- if (r)
- j->eob_run += stbi__jpeg_get_bits(j, r);
- r = 64; // force end of block
- } else {
- // r=15 s=0 should write 16 0s, so we just do
- // a run of 15 0s and then write s (which is 0),
- // so we don't have to do anything special here
- }
+static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64],
+ stbi__huffman *hac, stbi__int16 *fac)
+{
+ int k;
+ if (j->spec_start == 0)
+ return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+
+ if (j->succ_high == 0) {
+ int shift = j->succ_low;
+
+ if (j->eob_run) {
+ --j->eob_run;
+ return 1;
+ }
+
+ k = j->spec_start;
+ do {
+ unsigned int zig;
+ int c, r, s;
+ if (j->code_bits < 16)
+ stbi__grow_buffer_unsafe(j);
+ c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS) - 1);
+ r = fac[c];
+ if (r) { // fast-AC path
+ k += (r >> 4) & 15; // run
+ s = r & 15; // combined length
+ j->code_buffer <<= s;
+ j->code_bits -= s;
+ zig = stbi__jpeg_dezigzag[k++];
+ data[zig] = (short)((r >> 8) << shift);
} else {
- if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG");
- // sign bit
- if (stbi__jpeg_get_bit(j))
- s = bit;
- else
- s = -bit;
+ int rs = stbi__jpeg_huff_decode(j, hac);
+ if (rs < 0)
+ return stbi__err("bad huffman code", "Corrupt JPEG");
+ s = rs & 15;
+ r = rs >> 4;
+ if (s == 0) {
+ if (r < 15) {
+ j->eob_run = (1 << r);
+ if (r)
+ j->eob_run += stbi__jpeg_get_bits(j, r);
+ --j->eob_run;
+ break;
+ }
+ k += 16;
+ } else {
+ k += r;
+ zig = stbi__jpeg_dezigzag[k++];
+ data[zig] = (short)(stbi__extend_receive(j, s) << shift);
+ }
}
-
- // advance by r
- while (k <= j->spec_end) {
- short *p = &data[stbi__jpeg_dezigzag[k++]];
- if (*p != 0) {
- if (stbi__jpeg_get_bit(j))
- if ((*p & bit)==0) {
- if (*p > 0)
- *p += bit;
- else
- *p -= bit;
- }
- } else {
- if (r == 0) {
- *p = (short) s;
- break;
- }
- --r;
- }
+ } while (k <= j->spec_end);
+ } else {
+ // refinement scan for these AC coefficients
+
+ short bit = (short)(1 << j->succ_low);
+
+ if (j->eob_run) {
+ --j->eob_run;
+ for (k = j->spec_start; k <= j->spec_end; ++k) {
+ short *p = &data[stbi__jpeg_dezigzag[k]];
+ if (*p != 0)
+ if (stbi__jpeg_get_bit(j))
+ if ((*p & bit) == 0) {
+ if (*p > 0)
+ *p += bit;
+ else
+ *p -= bit;
+ }
}
- } while (k <= j->spec_end);
- }
- }
- return 1;
+ } else {
+ k = j->spec_start;
+ do {
+ int r, s;
+ int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we
+ // can use the fast
+ // path here,
+ // advance-by-r is so
+ // slow, eh
+ if (rs < 0)
+ return stbi__err("bad huffman code", "Corrupt JPEG");
+ s = rs & 15;
+ r = rs >> 4;
+ if (s == 0) {
+ if (r < 15) {
+ j->eob_run = (1 << r) - 1;
+ if (r)
+ j->eob_run += stbi__jpeg_get_bits(j, r);
+ r = 64; // force end of block
+ } else {
+ // r=15 s=0 should write 16 0s, so we just do
+ // a run of 15 0s and then write s (which is 0),
+ // so we don't have to do anything special here
+ }
+ } else {
+ if (s != 1)
+ return stbi__err("bad huffman code", "Corrupt JPEG");
+ // sign bit
+ if (stbi__jpeg_get_bit(j))
+ s = bit;
+ else
+ s = -bit;
+ }
+
+ // advance by r
+ while (k <= j->spec_end) {
+ short *p = &data[stbi__jpeg_dezigzag[k++]];
+ if (*p != 0) {
+ if (stbi__jpeg_get_bit(j))
+ if ((*p & bit) == 0) {
+ if (*p > 0)
+ *p += bit;
+ else
+ *p -= bit;
+ }
+ } else {
+ if (r == 0) {
+ *p = (short)s;
+ break;
+ }
+ --r;
+ }
+ }
+ } while (k <= j->spec_end);
+ }
+ }
+ return 1;
}
// take a -128..127 value and stbi__clamp it and convert to 0..255
stbi_inline static stbi_uc stbi__clamp(int x)
{
- // trick to use a single test to catch both cases
- if ((unsigned int) x > 255) {
- if (x < 0) return 0;
- if (x > 255) return 255;
- }
- return (stbi_uc) x;
+ // trick to use a single test to catch both cases
+ if ((unsigned int)x > 255) {
+ if (x < 0)
+ return 0;
+ if (x > 255)
+ return 255;
+ }
+ return (stbi_uc)x;
}
-#define stbi__f2f(x) ((int) (((x) * 4096 + 0.5)))
-#define stbi__fsh(x) ((x) << 12)
+#define stbi__f2f(x) ((int)(((x)*4096 + 0.5)))
+#define stbi__fsh(x) ((x) << 12)
// derived from jidctint -- DCT_ISLOW
-#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \
- int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \
- p2 = s2; \
- p3 = s6; \
- p1 = (p2+p3) * stbi__f2f(0.5411961f); \
- t2 = p1 + p3*stbi__f2f(-1.847759065f); \
- t3 = p1 + p2*stbi__f2f( 0.765366865f); \
- p2 = s0; \
- p3 = s4; \
- t0 = stbi__fsh(p2+p3); \
- t1 = stbi__fsh(p2-p3); \
- x0 = t0+t3; \
- x3 = t0-t3; \
- x1 = t1+t2; \
- x2 = t1-t2; \
- t0 = s7; \
- t1 = s5; \
- t2 = s3; \
- t3 = s1; \
- p3 = t0+t2; \
- p4 = t1+t3; \
- p1 = t0+t3; \
- p2 = t1+t2; \
- p5 = (p3+p4)*stbi__f2f( 1.175875602f); \
- t0 = t0*stbi__f2f( 0.298631336f); \
- t1 = t1*stbi__f2f( 2.053119869f); \
- t2 = t2*stbi__f2f( 3.072711026f); \
- t3 = t3*stbi__f2f( 1.501321110f); \
- p1 = p5 + p1*stbi__f2f(-0.899976223f); \
- p2 = p5 + p2*stbi__f2f(-2.562915447f); \
- p3 = p3*stbi__f2f(-1.961570560f); \
- p4 = p4*stbi__f2f(-0.390180644f); \
- t3 += p1+p4; \
- t2 += p2+p3; \
- t1 += p2+p4; \
- t0 += p1+p3;
+#define STBI__IDCT_1D(s0, s1, s2, s3, s4, s5, s6, s7) \
+ int t0, t1, t2, t3, p1, p2, p3, p4, p5, x0, x1, x2, x3; \
+ p2 = s2; \
+ p3 = s6; \
+ p1 = (p2 + p3) * stbi__f2f(0.5411961f); \
+ t2 = p1 + p3 * stbi__f2f(-1.847759065f); \
+ t3 = p1 + p2 * stbi__f2f(0.765366865f); \
+ p2 = s0; \
+ p3 = s4; \
+ t0 = stbi__fsh(p2 + p3); \
+ t1 = stbi__fsh(p2 - p3); \
+ x0 = t0 + t3; \
+ x3 = t0 - t3; \
+ x1 = t1 + t2; \
+ x2 = t1 - t2; \
+ t0 = s7; \
+ t1 = s5; \
+ t2 = s3; \
+ t3 = s1; \
+ p3 = t0 + t2; \
+ p4 = t1 + t3; \
+ p1 = t0 + t3; \
+ p2 = t1 + t2; \
+ p5 = (p3 + p4) * stbi__f2f(1.175875602f); \
+ t0 = t0 * stbi__f2f(0.298631336f); \
+ t1 = t1 * stbi__f2f(2.053119869f); \
+ t2 = t2 * stbi__f2f(3.072711026f); \
+ t3 = t3 * stbi__f2f(1.501321110f); \
+ p1 = p5 + p1 * stbi__f2f(-0.899976223f); \
+ p2 = p5 + p2 * stbi__f2f(-2.562915447f); \
+ p3 = p3 * stbi__f2f(-1.961570560f); \
+ p4 = p4 * stbi__f2f(-0.390180644f); \
+ t3 += p1 + p4; \
+ t2 += p2 + p3; \
+ t1 += p2 + p4; \
+ t0 += p1 + p3;
static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64])
{
- int i,val[64],*v=val;
- stbi_uc *o;
- short *d = data;
-
- // columns
- for (i=0; i < 8; ++i,++d, ++v) {
- // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
- if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0
- && d[40]==0 && d[48]==0 && d[56]==0) {
- // no shortcut 0 seconds
- // (1|2|3|4|5|6|7)==0 0 seconds
- // all separate -0.047 seconds
- // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds
- int dcterm = d[0] << 2;
- v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
- } else {
- STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56])
- // constants scaled things up by 1<<12; let's bring them back
- // down, but keep 2 extra bits of precision
- x0 += 512; x1 += 512; x2 += 512; x3 += 512;
- v[ 0] = (x0+t3) >> 10;
- v[56] = (x0-t3) >> 10;
- v[ 8] = (x1+t2) >> 10;
- v[48] = (x1-t2) >> 10;
- v[16] = (x2+t1) >> 10;
- v[40] = (x2-t1) >> 10;
- v[24] = (x3+t0) >> 10;
- v[32] = (x3-t0) >> 10;
- }
- }
-
- for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) {
- // no fast case since the first 1D IDCT spread components out
- STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7])
- // constants scaled things up by 1<<12, plus we had 1<<2 from first
- // loop, plus horizontal and vertical each scale by sqrt(8) so together
- // we've got an extra 1<<3, so 1<<17 total we need to remove.
- // so we want to round that, which means adding 0.5 * 1<<17,
- // aka 65536. Also, we'll end up with -128 to 127 that we want
- // to encode as 0..255 by adding 128, so we'll add that before the shift
- x0 += 65536 + (128<<17);
- x1 += 65536 + (128<<17);
- x2 += 65536 + (128<<17);
- x3 += 65536 + (128<<17);
- // tried computing the shifts into temps, or'ing the temps to see
- // if any were out of range, but that was slower
- o[0] = stbi__clamp((x0+t3) >> 17);
- o[7] = stbi__clamp((x0-t3) >> 17);
- o[1] = stbi__clamp((x1+t2) >> 17);
- o[6] = stbi__clamp((x1-t2) >> 17);
- o[2] = stbi__clamp((x2+t1) >> 17);
- o[5] = stbi__clamp((x2-t1) >> 17);
- o[3] = stbi__clamp((x3+t0) >> 17);
- o[4] = stbi__clamp((x3-t0) >> 17);
- }
+ int i, val[64], *v = val;
+ stbi_uc *o;
+ short *d = data;
+
+ // columns
+ for (i = 0; i < 8; ++i, ++d, ++v) {
+ // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
+ if (d[8] == 0 && d[16] == 0 && d[24] == 0 && d[32] == 0 && d[40] == 0 &&
+ d[48] == 0 && d[56] == 0) {
+ // no shortcut 0 seconds
+ // (1|2|3|4|5|6|7)==0 0 seconds
+ // all separate -0.047 seconds
+ // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds
+ int dcterm = d[0] << 2;
+ v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] =
+ dcterm;
+ } else {
+ STBI__IDCT_1D(d[0], d[8], d[16], d[24], d[32], d[40], d[48], d[56])
+ // constants scaled things up by 1<<12; let's bring them back
+ // down, but keep 2 extra bits of precision
+ x0 += 512;
+ x1 += 512;
+ x2 += 512;
+ x3 += 512;
+ v[0] = (x0 + t3) >> 10;
+ v[56] = (x0 - t3) >> 10;
+ v[8] = (x1 + t2) >> 10;
+ v[48] = (x1 - t2) >> 10;
+ v[16] = (x2 + t1) >> 10;
+ v[40] = (x2 - t1) >> 10;
+ v[24] = (x3 + t0) >> 10;
+ v[32] = (x3 - t0) >> 10;
+ }
+ }
+
+ for (i = 0, v = val, o = out; i < 8; ++i, v += 8, o += out_stride) {
+ // no fast case since the first 1D IDCT spread components out
+ STBI__IDCT_1D(v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7])
+ // constants scaled things up by 1<<12, plus we had 1<<2 from first
+ // loop, plus horizontal and vertical each scale by sqrt(8) so together
+ // we've got an extra 1<<3, so 1<<17 total we need to remove.
+ // so we want to round that, which means adding 0.5 * 1<<17,
+ // aka 65536. Also, we'll end up with -128 to 127 that we want
+ // to encode as 0..255 by adding 128, so we'll add that before the shift
+ x0 += 65536 + (128 << 17);
+ x1 += 65536 + (128 << 17);
+ x2 += 65536 + (128 << 17);
+ x3 += 65536 + (128 << 17);
+ // tried computing the shifts into temps, or'ing the temps to see
+ // if any were out of range, but that was slower
+ o[0] = stbi__clamp((x0 + t3) >> 17);
+ o[7] = stbi__clamp((x0 - t3) >> 17);
+ o[1] = stbi__clamp((x1 + t2) >> 17);
+ o[6] = stbi__clamp((x1 - t2) >> 17);
+ o[2] = stbi__clamp((x2 + t1) >> 17);
+ o[5] = stbi__clamp((x2 - t1) >> 17);
+ o[3] = stbi__clamp((x3 + t0) >> 17);
+ o[4] = stbi__clamp((x3 - t0) >> 17);
+ }
}
#ifdef STBI_SSE2
@@ -2217,167 +2494,194 @@ static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64])
// fully "transparent".
static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
{
- // This is constructed to match our regular (generic) integer IDCT exactly.
- __m128i row0, row1, row2, row3, row4, row5, row6, row7;
- __m128i tmp;
-
- // dot product constant: even elems=x, odd elems=y
- #define dct_const(x,y) _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y))
-
- // out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit)
- // out(1) = c1[even]*x + c1[odd]*y
- #define dct_rot(out0,out1, x,y,c0,c1) \
- __m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \
- __m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \
- __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \
- __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \
- __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \
- __m128i out1##_h = _mm_madd_epi16(c0##hi, c1)
-
- // out = in << 12 (in 16-bit, out 32-bit)
- #define dct_widen(out, in) \
- __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \
- __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4)
-
- // wide add
- #define dct_wadd(out, a, b) \
- __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \
- __m128i out##_h = _mm_add_epi32(a##_h, b##_h)
-
- // wide sub
- #define dct_wsub(out, a, b) \
- __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \
- __m128i out##_h = _mm_sub_epi32(a##_h, b##_h)
-
- // butterfly a/b, add bias, then shift by "s" and pack
- #define dct_bfly32o(out0, out1, a,b,bias,s) \
- { \
- __m128i abiased_l = _mm_add_epi32(a##_l, bias); \
- __m128i abiased_h = _mm_add_epi32(a##_h, bias); \
- dct_wadd(sum, abiased, b); \
- dct_wsub(dif, abiased, b); \
- out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \
- out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \
- }
-
- // 8-bit interleave step (for transposes)
- #define dct_interleave8(a, b) \
- tmp = a; \
- a = _mm_unpacklo_epi8(a, b); \
- b = _mm_unpackhi_epi8(tmp, b)
-
- // 16-bit interleave step (for transposes)
- #define dct_interleave16(a, b) \
- tmp = a; \
- a = _mm_unpacklo_epi16(a, b); \
- b = _mm_unpackhi_epi16(tmp, b)
-
- #define dct_pass(bias,shift) \
- { \
- /* even part */ \
- dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \
- __m128i sum04 = _mm_add_epi16(row0, row4); \
- __m128i dif04 = _mm_sub_epi16(row0, row4); \
- dct_widen(t0e, sum04); \
- dct_widen(t1e, dif04); \
- dct_wadd(x0, t0e, t3e); \
- dct_wsub(x3, t0e, t3e); \
- dct_wadd(x1, t1e, t2e); \
- dct_wsub(x2, t1e, t2e); \
- /* odd part */ \
- dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \
- dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \
- __m128i sum17 = _mm_add_epi16(row1, row7); \
- __m128i sum35 = _mm_add_epi16(row3, row5); \
- dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \
- dct_wadd(x4, y0o, y4o); \
- dct_wadd(x5, y1o, y5o); \
- dct_wadd(x6, y2o, y5o); \
- dct_wadd(x7, y3o, y4o); \
- dct_bfly32o(row0,row7, x0,x7,bias,shift); \
- dct_bfly32o(row1,row6, x1,x6,bias,shift); \
- dct_bfly32o(row2,row5, x2,x5,bias,shift); \
- dct_bfly32o(row3,row4, x3,x4,bias,shift); \
- }
-
- __m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f));
- __m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f));
- __m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f));
- __m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f));
- __m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f));
- __m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f));
- __m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f));
- __m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f));
-
- // rounding biases in column/row passes, see stbi__idct_block for explanation.
- __m128i bias_0 = _mm_set1_epi32(512);
- __m128i bias_1 = _mm_set1_epi32(65536 + (128<<17));
-
- // load
- row0 = _mm_load_si128((const __m128i *) (data + 0*8));
- row1 = _mm_load_si128((const __m128i *) (data + 1*8));
- row2 = _mm_load_si128((const __m128i *) (data + 2*8));
- row3 = _mm_load_si128((const __m128i *) (data + 3*8));
- row4 = _mm_load_si128((const __m128i *) (data + 4*8));
- row5 = _mm_load_si128((const __m128i *) (data + 5*8));
- row6 = _mm_load_si128((const __m128i *) (data + 6*8));
- row7 = _mm_load_si128((const __m128i *) (data + 7*8));
-
- // column pass
- dct_pass(bias_0, 10);
-
- {
- // 16bit 8x8 transpose pass 1
- dct_interleave16(row0, row4);
- dct_interleave16(row1, row5);
- dct_interleave16(row2, row6);
- dct_interleave16(row3, row7);
-
- // transpose pass 2
- dct_interleave16(row0, row2);
- dct_interleave16(row1, row3);
- dct_interleave16(row4, row6);
- dct_interleave16(row5, row7);
-
- // transpose pass 3
- dct_interleave16(row0, row1);
- dct_interleave16(row2, row3);
- dct_interleave16(row4, row5);
- dct_interleave16(row6, row7);
- }
-
- // row pass
- dct_pass(bias_1, 17);
-
- {
- // pack
- __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7
- __m128i p1 = _mm_packus_epi16(row2, row3);
- __m128i p2 = _mm_packus_epi16(row4, row5);
- __m128i p3 = _mm_packus_epi16(row6, row7);
-
- // 8bit 8x8 transpose pass 1
- dct_interleave8(p0, p2); // a0e0a1e1...
- dct_interleave8(p1, p3); // c0g0c1g1...
-
- // transpose pass 2
- dct_interleave8(p0, p1); // a0c0e0g0...
- dct_interleave8(p2, p3); // b0d0f0h0...
-
- // transpose pass 3
- dct_interleave8(p0, p2); // a0b0c0d0...
- dct_interleave8(p1, p3); // a4b4c4d4...
-
- // store
- _mm_storel_epi64((__m128i *) out, p0); out += out_stride;
- _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride;
- _mm_storel_epi64((__m128i *) out, p2); out += out_stride;
- _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride;
- _mm_storel_epi64((__m128i *) out, p1); out += out_stride;
- _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride;
- _mm_storel_epi64((__m128i *) out, p3); out += out_stride;
- _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e));
- }
+ // This is constructed to match our regular (generic) integer IDCT exactly.
+ __m128i row0, row1, row2, row3, row4, row5, row6, row7;
+ __m128i tmp;
+
+// dot product constant: even elems=x, odd elems=y
+#define dct_const(x, y) _mm_setr_epi16((x), (y), (x), (y), (x), (y), (x), (y))
+
+// out(0) = c0[even]*x + c0[odd]*y (c0, x, y 16-bit, out 32-bit)
+// out(1) = c1[even]*x + c1[odd]*y
+#define dct_rot(out0, out1, x, y, c0, c1) \
+ __m128i c0##lo = _mm_unpacklo_epi16((x), (y)); \
+ __m128i c0##hi = _mm_unpackhi_epi16((x), (y)); \
+ __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \
+ __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \
+ __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \
+ __m128i out1##_h = _mm_madd_epi16(c0##hi, c1)
+
+// out = in << 12 (in 16-bit, out 32-bit)
+#define dct_widen(out, in) \
+ __m128i out##_l = \
+ _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \
+ __m128i out##_h = \
+ _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4)
+
+// wide add
+#define dct_wadd(out, a, b) \
+ __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \
+ __m128i out##_h = _mm_add_epi32(a##_h, b##_h)
+
+// wide sub
+#define dct_wsub(out, a, b) \
+ __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \
+ __m128i out##_h = _mm_sub_epi32(a##_h, b##_h)
+
+// butterfly a/b, add bias, then shift by "s" and pack
+#define dct_bfly32o(out0, out1, a, b, bias, s) \
+ { \
+ __m128i abiased_l = _mm_add_epi32(a##_l, bias); \
+ __m128i abiased_h = _mm_add_epi32(a##_h, bias); \
+ dct_wadd(sum, abiased, b); \
+ dct_wsub(dif, abiased, b); \
+ out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), \
+ _mm_srai_epi32(sum_h, s)); \
+ out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), \
+ _mm_srai_epi32(dif_h, s)); \
+ }
+
+// 8-bit interleave step (for transposes)
+#define dct_interleave8(a, b) \
+ tmp = a; \
+ a = _mm_unpacklo_epi8(a, b); \
+ b = _mm_unpackhi_epi8(tmp, b)
+
+// 16-bit interleave step (for transposes)
+#define dct_interleave16(a, b) \
+ tmp = a; \
+ a = _mm_unpacklo_epi16(a, b); \
+ b = _mm_unpackhi_epi16(tmp, b)
+
+#define dct_pass(bias, shift) \
+ { \
+ /* even part */ \
+ dct_rot(t2e, t3e, row2, row6, rot0_0, rot0_1); \
+ __m128i sum04 = _mm_add_epi16(row0, row4); \
+ __m128i dif04 = _mm_sub_epi16(row0, row4); \
+ dct_widen(t0e, sum04); \
+ dct_widen(t1e, dif04); \
+ dct_wadd(x0, t0e, t3e); \
+ dct_wsub(x3, t0e, t3e); \
+ dct_wadd(x1, t1e, t2e); \
+ dct_wsub(x2, t1e, t2e); \
+ /* odd part */ \
+ dct_rot(y0o, y2o, row7, row3, rot2_0, rot2_1); \
+ dct_rot(y1o, y3o, row5, row1, rot3_0, rot3_1); \
+ __m128i sum17 = _mm_add_epi16(row1, row7); \
+ __m128i sum35 = _mm_add_epi16(row3, row5); \
+ dct_rot(y4o, y5o, sum17, sum35, rot1_0, rot1_1); \
+ dct_wadd(x4, y0o, y4o); \
+ dct_wadd(x5, y1o, y5o); \
+ dct_wadd(x6, y2o, y5o); \
+ dct_wadd(x7, y3o, y4o); \
+ dct_bfly32o(row0, row7, x0, x7, bias, shift); \
+ dct_bfly32o(row1, row6, x1, x6, bias, shift); \
+ dct_bfly32o(row2, row5, x2, x5, bias, shift); \
+ dct_bfly32o(row3, row4, x3, x4, bias, shift); \
+ }
+
+ __m128i rot0_0 =
+ dct_const(stbi__f2f(0.5411961f),
+ stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f));
+ __m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f(0.765366865f),
+ stbi__f2f(0.5411961f));
+ __m128i rot1_0 =
+ dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f),
+ stbi__f2f(1.175875602f));
+ __m128i rot1_1 =
+ dct_const(stbi__f2f(1.175875602f),
+ stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f));
+ __m128i rot2_0 =
+ dct_const(stbi__f2f(-1.961570560f) + stbi__f2f(0.298631336f),
+ stbi__f2f(-1.961570560f));
+ __m128i rot2_1 =
+ dct_const(stbi__f2f(-1.961570560f),
+ stbi__f2f(-1.961570560f) + stbi__f2f(3.072711026f));
+ __m128i rot3_0 =
+ dct_const(stbi__f2f(-0.390180644f) + stbi__f2f(2.053119869f),
+ stbi__f2f(-0.390180644f));
+ __m128i rot3_1 =
+ dct_const(stbi__f2f(-0.390180644f),
+ stbi__f2f(-0.390180644f) + stbi__f2f(1.501321110f));
+
+ // rounding biases in column/row passes, see stbi__idct_block for
+ // explanation.
+ __m128i bias_0 = _mm_set1_epi32(512);
+ __m128i bias_1 = _mm_set1_epi32(65536 + (128 << 17));
+
+ // load
+ row0 = _mm_load_si128((const __m128i *)(data + 0 * 8));
+ row1 = _mm_load_si128((const __m128i *)(data + 1 * 8));
+ row2 = _mm_load_si128((const __m128i *)(data + 2 * 8));
+ row3 = _mm_load_si128((const __m128i *)(data + 3 * 8));
+ row4 = _mm_load_si128((const __m128i *)(data + 4 * 8));
+ row5 = _mm_load_si128((const __m128i *)(data + 5 * 8));
+ row6 = _mm_load_si128((const __m128i *)(data + 6 * 8));
+ row7 = _mm_load_si128((const __m128i *)(data + 7 * 8));
+
+ // column pass
+ dct_pass(bias_0, 10);
+
+ {
+ // 16bit 8x8 transpose pass 1
+ dct_interleave16(row0, row4);
+ dct_interleave16(row1, row5);
+ dct_interleave16(row2, row6);
+ dct_interleave16(row3, row7);
+
+ // transpose pass 2
+ dct_interleave16(row0, row2);
+ dct_interleave16(row1, row3);
+ dct_interleave16(row4, row6);
+ dct_interleave16(row5, row7);
+
+ // transpose pass 3
+ dct_interleave16(row0, row1);
+ dct_interleave16(row2, row3);
+ dct_interleave16(row4, row5);
+ dct_interleave16(row6, row7);
+ }
+
+ // row pass
+ dct_pass(bias_1, 17);
+
+ {
+ // pack
+ __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7
+ __m128i p1 = _mm_packus_epi16(row2, row3);
+ __m128i p2 = _mm_packus_epi16(row4, row5);
+ __m128i p3 = _mm_packus_epi16(row6, row7);
+
+ // 8bit 8x8 transpose pass 1
+ dct_interleave8(p0, p2); // a0e0a1e1...
+ dct_interleave8(p1, p3); // c0g0c1g1...
+
+ // transpose pass 2
+ dct_interleave8(p0, p1); // a0c0e0g0...
+ dct_interleave8(p2, p3); // b0d0f0h0...
+
+ // transpose pass 3
+ dct_interleave8(p0, p2); // a0b0c0d0...
+ dct_interleave8(p1, p3); // a4b4c4d4...
+
+ // store
+ _mm_storel_epi64((__m128i *)out, p0);
+ out += out_stride;
+ _mm_storel_epi64((__m128i *)out, _mm_shuffle_epi32(p0, 0x4e));
+ out += out_stride;
+ _mm_storel_epi64((__m128i *)out, p2);
+ out += out_stride;
+ _mm_storel_epi64((__m128i *)out, _mm_shuffle_epi32(p2, 0x4e));
+ out += out_stride;
+ _mm_storel_epi64((__m128i *)out, p1);
+ out += out_stride;
+ _mm_storel_epi64((__m128i *)out, _mm_shuffle_epi32(p1, 0x4e));
+ out += out_stride;
+ _mm_storel_epi64((__m128i *)out, p3);
+ out += out_stride;
+ _mm_storel_epi64((__m128i *)out, _mm_shuffle_epi32(p3, 0x4e));
+ }
#undef dct_const
#undef dct_rot
@@ -2398,196 +2702,237 @@ static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
// results to the generic C version.
static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
{
- int16x8_t row0, row1, row2, row3, row4, row5, row6, row7;
-
- int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f));
- int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f));
- int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f));
- int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f));
- int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f));
- int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f));
- int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f));
- int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f));
- int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f));
- int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f));
- int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f));
- int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f));
-
-#define dct_long_mul(out, inq, coeff) \
- int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \
- int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff)
-
-#define dct_long_mac(out, acc, inq, coeff) \
- int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \
- int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff)
-
-#define dct_widen(out, inq) \
- int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \
- int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12)
+ int16x8_t row0, row1, row2, row3, row4, row5, row6, row7;
+
+ int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f));
+ int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f));
+ int16x4_t rot0_2 = vdup_n_s16(stbi__f2f(0.765366865f));
+ int16x4_t rot1_0 = vdup_n_s16(stbi__f2f(1.175875602f));
+ int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f));
+ int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f));
+ int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f));
+ int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f));
+ int16x4_t rot3_0 = vdup_n_s16(stbi__f2f(0.298631336f));
+ int16x4_t rot3_1 = vdup_n_s16(stbi__f2f(2.053119869f));
+ int16x4_t rot3_2 = vdup_n_s16(stbi__f2f(3.072711026f));
+ int16x4_t rot3_3 = vdup_n_s16(stbi__f2f(1.501321110f));
+
+#define dct_long_mul(out, inq, coeff) \
+ int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \
+ int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff)
+
+#define dct_long_mac(out, acc, inq, coeff) \
+ int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \
+ int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff)
+
+#define dct_widen(out, inq) \
+ int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \
+ int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12)
// wide add
-#define dct_wadd(out, a, b) \
- int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \
- int32x4_t out##_h = vaddq_s32(a##_h, b##_h)
+#define dct_wadd(out, a, b) \
+ int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \
+ int32x4_t out##_h = vaddq_s32(a##_h, b##_h)
// wide sub
-#define dct_wsub(out, a, b) \
- int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \
- int32x4_t out##_h = vsubq_s32(a##_h, b##_h)
+#define dct_wsub(out, a, b) \
+ int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \
+ int32x4_t out##_h = vsubq_s32(a##_h, b##_h)
// butterfly a/b, then shift using "shiftop" by "s" and pack
-#define dct_bfly32o(out0,out1, a,b,shiftop,s) \
- { \
- dct_wadd(sum, a, b); \
- dct_wsub(dif, a, b); \
- out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \
- out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \
- }
-
-#define dct_pass(shiftop, shift) \
- { \
- /* even part */ \
- int16x8_t sum26 = vaddq_s16(row2, row6); \
- dct_long_mul(p1e, sum26, rot0_0); \
- dct_long_mac(t2e, p1e, row6, rot0_1); \
- dct_long_mac(t3e, p1e, row2, rot0_2); \
- int16x8_t sum04 = vaddq_s16(row0, row4); \
- int16x8_t dif04 = vsubq_s16(row0, row4); \
- dct_widen(t0e, sum04); \
- dct_widen(t1e, dif04); \
- dct_wadd(x0, t0e, t3e); \
- dct_wsub(x3, t0e, t3e); \
- dct_wadd(x1, t1e, t2e); \
- dct_wsub(x2, t1e, t2e); \
- /* odd part */ \
- int16x8_t sum15 = vaddq_s16(row1, row5); \
- int16x8_t sum17 = vaddq_s16(row1, row7); \
- int16x8_t sum35 = vaddq_s16(row3, row5); \
- int16x8_t sum37 = vaddq_s16(row3, row7); \
- int16x8_t sumodd = vaddq_s16(sum17, sum35); \
- dct_long_mul(p5o, sumodd, rot1_0); \
- dct_long_mac(p1o, p5o, sum17, rot1_1); \
- dct_long_mac(p2o, p5o, sum35, rot1_2); \
- dct_long_mul(p3o, sum37, rot2_0); \
- dct_long_mul(p4o, sum15, rot2_1); \
- dct_wadd(sump13o, p1o, p3o); \
- dct_wadd(sump24o, p2o, p4o); \
- dct_wadd(sump23o, p2o, p3o); \
- dct_wadd(sump14o, p1o, p4o); \
- dct_long_mac(x4, sump13o, row7, rot3_0); \
- dct_long_mac(x5, sump24o, row5, rot3_1); \
- dct_long_mac(x6, sump23o, row3, rot3_2); \
- dct_long_mac(x7, sump14o, row1, rot3_3); \
- dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \
- dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \
- dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \
- dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \
- }
-
- // load
- row0 = vld1q_s16(data + 0*8);
- row1 = vld1q_s16(data + 1*8);
- row2 = vld1q_s16(data + 2*8);
- row3 = vld1q_s16(data + 3*8);
- row4 = vld1q_s16(data + 4*8);
- row5 = vld1q_s16(data + 5*8);
- row6 = vld1q_s16(data + 6*8);
- row7 = vld1q_s16(data + 7*8);
-
- // add DC bias
- row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0));
-
- // column pass
- dct_pass(vrshrn_n_s32, 10);
-
- // 16bit 8x8 transpose
- {
+#define dct_bfly32o(out0, out1, a, b, shiftop, s) \
+ { \
+ dct_wadd(sum, a, b); \
+ dct_wsub(dif, a, b); \
+ out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \
+ out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \
+ }
+
+#define dct_pass(shiftop, shift) \
+ { \
+ /* even part */ \
+ int16x8_t sum26 = vaddq_s16(row2, row6); \
+ dct_long_mul(p1e, sum26, rot0_0); \
+ dct_long_mac(t2e, p1e, row6, rot0_1); \
+ dct_long_mac(t3e, p1e, row2, rot0_2); \
+ int16x8_t sum04 = vaddq_s16(row0, row4); \
+ int16x8_t dif04 = vsubq_s16(row0, row4); \
+ dct_widen(t0e, sum04); \
+ dct_widen(t1e, dif04); \
+ dct_wadd(x0, t0e, t3e); \
+ dct_wsub(x3, t0e, t3e); \
+ dct_wadd(x1, t1e, t2e); \
+ dct_wsub(x2, t1e, t2e); \
+ /* odd part */ \
+ int16x8_t sum15 = vaddq_s16(row1, row5); \
+ int16x8_t sum17 = vaddq_s16(row1, row7); \
+ int16x8_t sum35 = vaddq_s16(row3, row5); \
+ int16x8_t sum37 = vaddq_s16(row3, row7); \
+ int16x8_t sumodd = vaddq_s16(sum17, sum35); \
+ dct_long_mul(p5o, sumodd, rot1_0); \
+ dct_long_mac(p1o, p5o, sum17, rot1_1); \
+ dct_long_mac(p2o, p5o, sum35, rot1_2); \
+ dct_long_mul(p3o, sum37, rot2_0); \
+ dct_long_mul(p4o, sum15, rot2_1); \
+ dct_wadd(sump13o, p1o, p3o); \
+ dct_wadd(sump24o, p2o, p4o); \
+ dct_wadd(sump23o, p2o, p3o); \
+ dct_wadd(sump14o, p1o, p4o); \
+ dct_long_mac(x4, sump13o, row7, rot3_0); \
+ dct_long_mac(x5, sump24o, row5, rot3_1); \
+ dct_long_mac(x6, sump23o, row3, rot3_2); \
+ dct_long_mac(x7, sump14o, row1, rot3_3); \
+ dct_bfly32o(row0, row7, x0, x7, shiftop, shift); \
+ dct_bfly32o(row1, row6, x1, x6, shiftop, shift); \
+ dct_bfly32o(row2, row5, x2, x5, shiftop, shift); \
+ dct_bfly32o(row3, row4, x3, x4, shiftop, shift); \
+ }
+
+ // load
+ row0 = vld1q_s16(data + 0 * 8);
+ row1 = vld1q_s16(data + 1 * 8);
+ row2 = vld1q_s16(data + 2 * 8);
+ row3 = vld1q_s16(data + 3 * 8);
+ row4 = vld1q_s16(data + 4 * 8);
+ row5 = vld1q_s16(data + 5 * 8);
+ row6 = vld1q_s16(data + 6 * 8);
+ row7 = vld1q_s16(data + 7 * 8);
+
+ // add DC bias
+ row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0));
+
+ // column pass
+ dct_pass(vrshrn_n_s32, 10);
+
+ // 16bit 8x8 transpose
+ {
// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively.
// whether compilers actually get this is another story, sadly.
-#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; }
-#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); }
-#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); }
-
- // pass 1
- dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6
- dct_trn16(row2, row3);
- dct_trn16(row4, row5);
- dct_trn16(row6, row7);
-
- // pass 2
- dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4
- dct_trn32(row1, row3);
- dct_trn32(row4, row6);
- dct_trn32(row5, row7);
-
- // pass 3
- dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0
- dct_trn64(row1, row5);
- dct_trn64(row2, row6);
- dct_trn64(row3, row7);
+#define dct_trn16(x, y) \
+ { \
+ int16x8x2_t t = vtrnq_s16(x, y); \
+ x = t.val[0]; \
+ y = t.val[1]; \
+ }
+#define dct_trn32(x, y) \
+ { \
+ int32x4x2_t t = \
+ vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); \
+ x = vreinterpretq_s16_s32(t.val[0]); \
+ y = vreinterpretq_s16_s32(t.val[1]); \
+ }
+#define dct_trn64(x, y) \
+ { \
+ int16x8_t x0 = x; \
+ int16x8_t y0 = y; \
+ x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); \
+ y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); \
+ }
+
+ // pass 1
+ dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6
+ dct_trn16(row2, row3);
+ dct_trn16(row4, row5);
+ dct_trn16(row6, row7);
+
+ // pass 2
+ dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4
+ dct_trn32(row1, row3);
+ dct_trn32(row4, row6);
+ dct_trn32(row5, row7);
+
+ // pass 3
+ dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0
+ dct_trn64(row1, row5);
+ dct_trn64(row2, row6);
+ dct_trn64(row3, row7);
#undef dct_trn16
#undef dct_trn32
#undef dct_trn64
- }
-
- // row pass
- // vrshrn_n_s32 only supports shifts up to 16, we need
- // 17. so do a non-rounding shift of 16 first then follow
- // up with a rounding shift by 1.
- dct_pass(vshrn_n_s32, 16);
-
- {
- // pack and round
- uint8x8_t p0 = vqrshrun_n_s16(row0, 1);
- uint8x8_t p1 = vqrshrun_n_s16(row1, 1);
- uint8x8_t p2 = vqrshrun_n_s16(row2, 1);
- uint8x8_t p3 = vqrshrun_n_s16(row3, 1);
- uint8x8_t p4 = vqrshrun_n_s16(row4, 1);
- uint8x8_t p5 = vqrshrun_n_s16(row5, 1);
- uint8x8_t p6 = vqrshrun_n_s16(row6, 1);
- uint8x8_t p7 = vqrshrun_n_s16(row7, 1);
-
- // again, these can translate into one instruction, but often don't.
-#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; }
-#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); }
-#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); }
-
- // sadly can't use interleaved stores here since we only write
- // 8 bytes to each scan line!
-
- // 8x8 8-bit transpose pass 1
- dct_trn8_8(p0, p1);
- dct_trn8_8(p2, p3);
- dct_trn8_8(p4, p5);
- dct_trn8_8(p6, p7);
-
- // pass 2
- dct_trn8_16(p0, p2);
- dct_trn8_16(p1, p3);
- dct_trn8_16(p4, p6);
- dct_trn8_16(p5, p7);
-
- // pass 3
- dct_trn8_32(p0, p4);
- dct_trn8_32(p1, p5);
- dct_trn8_32(p2, p6);
- dct_trn8_32(p3, p7);
-
- // store
- vst1_u8(out, p0); out += out_stride;
- vst1_u8(out, p1); out += out_stride;
- vst1_u8(out, p2); out += out_stride;
- vst1_u8(out, p3); out += out_stride;
- vst1_u8(out, p4); out += out_stride;
- vst1_u8(out, p5); out += out_stride;
- vst1_u8(out, p6); out += out_stride;
- vst1_u8(out, p7);
+ }
+
+ // row pass
+ // vrshrn_n_s32 only supports shifts up to 16, we need
+ // 17. so do a non-rounding shift of 16 first then follow
+ // up with a rounding shift by 1.
+ dct_pass(vshrn_n_s32, 16);
+
+ {
+ // pack and round
+ uint8x8_t p0 = vqrshrun_n_s16(row0, 1);
+ uint8x8_t p1 = vqrshrun_n_s16(row1, 1);
+ uint8x8_t p2 = vqrshrun_n_s16(row2, 1);
+ uint8x8_t p3 = vqrshrun_n_s16(row3, 1);
+ uint8x8_t p4 = vqrshrun_n_s16(row4, 1);
+ uint8x8_t p5 = vqrshrun_n_s16(row5, 1);
+ uint8x8_t p6 = vqrshrun_n_s16(row6, 1);
+ uint8x8_t p7 = vqrshrun_n_s16(row7, 1);
+
+ // again, these can translate into one instruction, but often don't.
+#define dct_trn8_8(x, y) \
+ { \
+ uint8x8x2_t t = vtrn_u8(x, y); \
+ x = t.val[0]; \
+ y = t.val[1]; \
+ }
+#define dct_trn8_16(x, y) \
+ { \
+ uint16x4x2_t t = \
+ vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); \
+ x = vreinterpret_u8_u16(t.val[0]); \
+ y = vreinterpret_u8_u16(t.val[1]); \
+ }
+#define dct_trn8_32(x, y) \
+ { \
+ uint32x2x2_t t = \
+ vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); \
+ x = vreinterpret_u8_u32(t.val[0]); \
+ y = vreinterpret_u8_u32(t.val[1]); \
+ }
+
+ // sadly can't use interleaved stores here since we only write
+ // 8 bytes to each scan line!
+
+ // 8x8 8-bit transpose pass 1
+ dct_trn8_8(p0, p1);
+ dct_trn8_8(p2, p3);
+ dct_trn8_8(p4, p5);
+ dct_trn8_8(p6, p7);
+
+ // pass 2
+ dct_trn8_16(p0, p2);
+ dct_trn8_16(p1, p3);
+ dct_trn8_16(p4, p6);
+ dct_trn8_16(p5, p7);
+
+ // pass 3
+ dct_trn8_32(p0, p4);
+ dct_trn8_32(p1, p5);
+ dct_trn8_32(p2, p6);
+ dct_trn8_32(p3, p7);
+
+ // store
+ vst1_u8(out, p0);
+ out += out_stride;
+ vst1_u8(out, p1);
+ out += out_stride;
+ vst1_u8(out, p2);
+ out += out_stride;
+ vst1_u8(out, p3);
+ out += out_stride;
+ vst1_u8(out, p4);
+ out += out_stride;
+ vst1_u8(out, p5);
+ out += out_stride;
+ vst1_u8(out, p6);
+ out += out_stride;
+ vst1_u8(out, p7);
#undef dct_trn8_8
#undef dct_trn8_16
#undef dct_trn8_32
- }
+ }
#undef dct_long_mul
#undef dct_long_mac
@@ -2600,1220 +2945,1409 @@ static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
#endif // STBI_NEON
-#define STBI__MARKER_none 0xff
+#define STBI__MARKER_none 0xff
// if there's a pending marker from the entropy stream, return that
// otherwise, fetch from the stream and get a marker. if there's no
// marker, return 0xff, which is never a valid marker value
static stbi_uc stbi__get_marker(stbi__jpeg *j)
{
- stbi_uc x;
- if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; }
- x = stbi__get8(j->s);
- if (x != 0xff) return STBI__MARKER_none;
- while (x == 0xff)
- x = stbi__get8(j->s); // consume repeated 0xff fill bytes
- return x;
+ stbi_uc x;
+ if (j->marker != STBI__MARKER_none) {
+ x = j->marker;
+ j->marker = STBI__MARKER_none;
+ return x;
+ }
+ x = stbi__get8(j->s);
+ if (x != 0xff)
+ return STBI__MARKER_none;
+ while (x == 0xff)
+ x = stbi__get8(j->s); // consume repeated 0xff fill bytes
+ return x;
}
// in each scan, we'll have scan_n components, and the order
// of the components is specified by order[]
-#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7)
+#define STBI__RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7)
// after a restart interval, stbi__jpeg_reset the entropy decoder and
// the dc prediction
static void stbi__jpeg_reset(stbi__jpeg *j)
{
- j->code_bits = 0;
- j->code_buffer = 0;
- j->nomore = 0;
- j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = j->img_comp[3].dc_pred = 0;
- j->marker = STBI__MARKER_none;
- j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
- j->eob_run = 0;
- // no more than 1<<31 MCUs if no restart_interal? that's plenty safe,
- // since we don't even allow 1<<30 pixels
+ j->code_bits = 0;
+ j->code_buffer = 0;
+ j->nomore = 0;
+ j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred =
+ j->img_comp[3].dc_pred = 0;
+ j->marker = STBI__MARKER_none;
+ j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
+ j->eob_run = 0;
+ // no more than 1<<31 MCUs if no restart_interal? that's plenty safe,
+ // since we don't even allow 1<<30 pixels
}
static int stbi__parse_entropy_coded_data(stbi__jpeg *z)
{
- stbi__jpeg_reset(z);
- if (!z->progressive) {
- if (z->scan_n == 1) {
- int i,j;
- STBI_SIMD_ALIGN(short, data[64]);
- int n = z->order[0];
- // non-interleaved data, we just need to process one block at a time,
- // in trivial scanline order
- // number of blocks to do just depends on how many actual "pixels" this
- // component has, independent of interleaved MCU blocking and such
- int w = (z->img_comp[n].x+7) >> 3;
- int h = (z->img_comp[n].y+7) >> 3;
- for (j=0; j < h; ++j) {
- for (i=0; i < w; ++i) {
- int ha = z->img_comp[n].ha;
- if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
- z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
- // every data block is an MCU, so countdown the restart interval
- if (--z->todo <= 0) {
- if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
- // if it's NOT a restart, then just bail, so we get corrupt data
- // rather than no data
- if (!STBI__RESTART(z->marker)) return 1;
- stbi__jpeg_reset(z);
- }
+ stbi__jpeg_reset(z);
+ if (!z->progressive) {
+ if (z->scan_n == 1) {
+ int i, j;
+ STBI_SIMD_ALIGN(short, data[64]);
+ int n = z->order[0];
+ // non-interleaved data, we just need to process one block at a
+ // time, in trivial scanline order number of blocks to do just
+ // depends on how many actual "pixels" this component has,
+ // independent of interleaved MCU blocking and such
+ int w = (z->img_comp[n].x + 7) >> 3;
+ int h = (z->img_comp[n].y + 7) >> 3;
+ for (j = 0; j < h; ++j) {
+ for (i = 0; i < w; ++i) {
+ int ha = z->img_comp[n].ha;
+ if (!stbi__jpeg_decode_block(
+ z, data, z->huff_dc + z->img_comp[n].hd,
+ z->huff_ac + ha, z->fast_ac[ha], n,
+ z->dequant[z->img_comp[n].tq]))
+ return 0;
+ z->idct_block_kernel(z->img_comp[n].data +
+ z->img_comp[n].w2 * j * 8 + i * 8,
+ z->img_comp[n].w2, data);
+ // every data block is an MCU, so countdown the restart
+ // interval
+ if (--z->todo <= 0) {
+ if (z->code_bits < 24)
+ stbi__grow_buffer_unsafe(z);
+ // if it's NOT a restart, then just bail, so we get
+ // corrupt data rather than no data
+ if (!STBI__RESTART(z->marker))
+ return 1;
+ stbi__jpeg_reset(z);
+ }
+ }
}
- }
- return 1;
- } else { // interleaved
- int i,j,k,x,y;
- STBI_SIMD_ALIGN(short, data[64]);
- for (j=0; j < z->img_mcu_y; ++j) {
- for (i=0; i < z->img_mcu_x; ++i) {
- // scan an interleaved mcu... process scan_n components in order
- for (k=0; k < z->scan_n; ++k) {
- int n = z->order[k];
- // scan out an mcu's worth of this component; that's just determined
- // by the basic H and V specified for the component
- for (y=0; y < z->img_comp[n].v; ++y) {
- for (x=0; x < z->img_comp[n].h; ++x) {
- int x2 = (i*z->img_comp[n].h + x)*8;
- int y2 = (j*z->img_comp[n].v + y)*8;
- int ha = z->img_comp[n].ha;
- if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
- z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data);
- }
- }
- }
- // after all interleaved components, that's an interleaved MCU,
- // so now count down the restart interval
- if (--z->todo <= 0) {
- if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
- if (!STBI__RESTART(z->marker)) return 1;
- stbi__jpeg_reset(z);
- }
+ return 1;
+ } else { // interleaved
+ int i, j, k, x, y;
+ STBI_SIMD_ALIGN(short, data[64]);
+ for (j = 0; j < z->img_mcu_y; ++j) {
+ for (i = 0; i < z->img_mcu_x; ++i) {
+ // scan an interleaved mcu... process scan_n components in
+ // order
+ for (k = 0; k < z->scan_n; ++k) {
+ int n = z->order[k];
+ // scan out an mcu's worth of this component; that's
+ // just determined by the basic H and V specified for
+ // the component
+ for (y = 0; y < z->img_comp[n].v; ++y) {
+ for (x = 0; x < z->img_comp[n].h; ++x) {
+ int x2 = (i * z->img_comp[n].h + x) * 8;
+ int y2 = (j * z->img_comp[n].v + y) * 8;
+ int ha = z->img_comp[n].ha;
+ if (!stbi__jpeg_decode_block(
+ z, data, z->huff_dc + z->img_comp[n].hd,
+ z->huff_ac + ha, z->fast_ac[ha], n,
+ z->dequant[z->img_comp[n].tq]))
+ return 0;
+ z->idct_block_kernel(
+ z->img_comp[n].data +
+ z->img_comp[n].w2 * y2 + x2,
+ z->img_comp[n].w2, data);
+ }
+ }
+ }
+ // after all interleaved components, that's an interleaved
+ // MCU, so now count down the restart interval
+ if (--z->todo <= 0) {
+ if (z->code_bits < 24)
+ stbi__grow_buffer_unsafe(z);
+ if (!STBI__RESTART(z->marker))
+ return 1;
+ stbi__jpeg_reset(z);
+ }
+ }
}
- }
- return 1;
- }
- } else {
- if (z->scan_n == 1) {
- int i,j;
- int n = z->order[0];
- // non-interleaved data, we just need to process one block at a time,
- // in trivial scanline order
- // number of blocks to do just depends on how many actual "pixels" this
- // component has, independent of interleaved MCU blocking and such
- int w = (z->img_comp[n].x+7) >> 3;
- int h = (z->img_comp[n].y+7) >> 3;
- for (j=0; j < h; ++j) {
- for (i=0; i < w; ++i) {
- short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
- if (z->spec_start == 0) {
- if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
- return 0;
- } else {
- int ha = z->img_comp[n].ha;
- if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha]))
- return 0;
- }
- // every data block is an MCU, so countdown the restart interval
- if (--z->todo <= 0) {
- if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
- if (!STBI__RESTART(z->marker)) return 1;
- stbi__jpeg_reset(z);
- }
+ return 1;
+ }
+ } else {
+ if (z->scan_n == 1) {
+ int i, j;
+ int n = z->order[0];
+ // non-interleaved data, we just need to process one block at a
+ // time, in trivial scanline order number of blocks to do just
+ // depends on how many actual "pixels" this component has,
+ // independent of interleaved MCU blocking and such
+ int w = (z->img_comp[n].x + 7) >> 3;
+ int h = (z->img_comp[n].y + 7) >> 3;
+ for (j = 0; j < h; ++j) {
+ for (i = 0; i < w; ++i) {
+ short *data = z->img_comp[n].coeff +
+ 64 * (i + j * z->img_comp[n].coeff_w);
+ if (z->spec_start == 0) {
+ if (!stbi__jpeg_decode_block_prog_dc(
+ z, data, &z->huff_dc[z->img_comp[n].hd], n))
+ return 0;
+ } else {
+ int ha = z->img_comp[n].ha;
+ if (!stbi__jpeg_decode_block_prog_ac(
+ z, data, &z->huff_ac[ha], z->fast_ac[ha]))
+ return 0;
+ }
+ // every data block is an MCU, so countdown the restart
+ // interval
+ if (--z->todo <= 0) {
+ if (z->code_bits < 24)
+ stbi__grow_buffer_unsafe(z);
+ if (!STBI__RESTART(z->marker))
+ return 1;
+ stbi__jpeg_reset(z);
+ }
+ }
}
- }
- return 1;
- } else { // interleaved
- int i,j,k,x,y;
- for (j=0; j < z->img_mcu_y; ++j) {
- for (i=0; i < z->img_mcu_x; ++i) {
- // scan an interleaved mcu... process scan_n components in order
- for (k=0; k < z->scan_n; ++k) {
- int n = z->order[k];
- // scan out an mcu's worth of this component; that's just determined
- // by the basic H and V specified for the component
- for (y=0; y < z->img_comp[n].v; ++y) {
- for (x=0; x < z->img_comp[n].h; ++x) {
- int x2 = (i*z->img_comp[n].h + x);
- int y2 = (j*z->img_comp[n].v + y);
- short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w);
- if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
- return 0;
- }
- }
- }
- // after all interleaved components, that's an interleaved MCU,
- // so now count down the restart interval
- if (--z->todo <= 0) {
- if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
- if (!STBI__RESTART(z->marker)) return 1;
- stbi__jpeg_reset(z);
- }
+ return 1;
+ } else { // interleaved
+ int i, j, k, x, y;
+ for (j = 0; j < z->img_mcu_y; ++j) {
+ for (i = 0; i < z->img_mcu_x; ++i) {
+ // scan an interleaved mcu... process scan_n components in
+ // order
+ for (k = 0; k < z->scan_n; ++k) {
+ int n = z->order[k];
+ // scan out an mcu's worth of this component; that's
+ // just determined by the basic H and V specified for
+ // the component
+ for (y = 0; y < z->img_comp[n].v; ++y) {
+ for (x = 0; x < z->img_comp[n].h; ++x) {
+ int x2 = (i * z->img_comp[n].h + x);
+ int y2 = (j * z->img_comp[n].v + y);
+ short *data =
+ z->img_comp[n].coeff +
+ 64 * (x2 + y2 * z->img_comp[n].coeff_w);
+ if (!stbi__jpeg_decode_block_prog_dc(
+ z, data, &z->huff_dc[z->img_comp[n].hd],
+ n))
+ return 0;
+ }
+ }
+ }
+ // after all interleaved components, that's an interleaved
+ // MCU, so now count down the restart interval
+ if (--z->todo <= 0) {
+ if (z->code_bits < 24)
+ stbi__grow_buffer_unsafe(z);
+ if (!STBI__RESTART(z->marker))
+ return 1;
+ stbi__jpeg_reset(z);
+ }
+ }
}
- }
- return 1;
- }
- }
+ return 1;
+ }
+ }
}
static void stbi__jpeg_dequantize(short *data, stbi__uint16 *dequant)
{
- int i;
- for (i=0; i < 64; ++i)
- data[i] *= dequant[i];
+ int i;
+ for (i = 0; i < 64; ++i)
+ data[i] *= dequant[i];
}
static void stbi__jpeg_finish(stbi__jpeg *z)
{
- if (z->progressive) {
- // dequantize and idct the data
- int i,j,n;
- for (n=0; n < z->s->img_n; ++n) {
- int w = (z->img_comp[n].x+7) >> 3;
- int h = (z->img_comp[n].y+7) >> 3;
- for (j=0; j < h; ++j) {
- for (i=0; i < w; ++i) {
- short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
- stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]);
- z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
+ if (z->progressive) {
+ // dequantize and idct the data
+ int i, j, n;
+ for (n = 0; n < z->s->img_n; ++n) {
+ int w = (z->img_comp[n].x + 7) >> 3;
+ int h = (z->img_comp[n].y + 7) >> 3;
+ for (j = 0; j < h; ++j) {
+ for (i = 0; i < w; ++i) {
+ short *data = z->img_comp[n].coeff +
+ 64 * (i + j * z->img_comp[n].coeff_w);
+ stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]);
+ z->idct_block_kernel(z->img_comp[n].data +
+ z->img_comp[n].w2 * j * 8 + i * 8,
+ z->img_comp[n].w2, data);
+ }
}
- }
- }
- }
+ }
+ }
}
static int stbi__process_marker(stbi__jpeg *z, int m)
{
- int L;
- switch (m) {
- case STBI__MARKER_none: // no marker found
- return stbi__err("expected marker","Corrupt JPEG");
+ int L;
+ switch (m) {
+ case STBI__MARKER_none: // no marker found
+ return stbi__err("expected marker", "Corrupt JPEG");
- case 0xDD: // DRI - specify restart interval
- if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG");
- z->restart_interval = stbi__get16be(z->s);
- return 1;
+ case 0xDD: // DRI - specify restart interval
+ if (stbi__get16be(z->s) != 4)
+ return stbi__err("bad DRI len", "Corrupt JPEG");
+ z->restart_interval = stbi__get16be(z->s);
+ return 1;
- case 0xDB: // DQT - define quantization table
- L = stbi__get16be(z->s)-2;
- while (L > 0) {
+ case 0xDB: // DQT - define quantization table
+ L = stbi__get16be(z->s) - 2;
+ while (L > 0) {
int q = stbi__get8(z->s);
int p = q >> 4, sixteen = (p != 0);
- int t = q & 15,i;
- if (p != 0 && p != 1) return stbi__err("bad DQT type","Corrupt JPEG");
- if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG");
-
- for (i=0; i < 64; ++i)
- z->dequant[t][stbi__jpeg_dezigzag[i]] = (stbi__uint16)(sixteen ? stbi__get16be(z->s) : stbi__get8(z->s));
+ int t = q & 15, i;
+ if (p != 0 && p != 1)
+ return stbi__err("bad DQT type", "Corrupt JPEG");
+ if (t > 3)
+ return stbi__err("bad DQT table", "Corrupt JPEG");
+
+ for (i = 0; i < 64; ++i)
+ z->dequant[t][stbi__jpeg_dezigzag[i]] = (stbi__uint16)(
+ sixteen ? stbi__get16be(z->s) : stbi__get8(z->s));
L -= (sixteen ? 129 : 65);
- }
- return L==0;
+ }
+ return L == 0;
- case 0xC4: // DHT - define huffman table
- L = stbi__get16be(z->s)-2;
- while (L > 0) {
+ case 0xC4: // DHT - define huffman table
+ L = stbi__get16be(z->s) - 2;
+ while (L > 0) {
stbi_uc *v;
- int sizes[16],i,n=0;
- int q = stbi__get8(z->s);
+ int sizes[16], i, n = 0;
+ int q = stbi__get8(z->s);
int tc = q >> 4;
int th = q & 15;
- if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG");
- for (i=0; i < 16; ++i) {
- sizes[i] = stbi__get8(z->s);
- n += sizes[i];
+ if (tc > 1 || th > 3)
+ return stbi__err("bad DHT header", "Corrupt JPEG");
+ for (i = 0; i < 16; ++i) {
+ sizes[i] = stbi__get8(z->s);
+ n += sizes[i];
}
L -= 17;
if (tc == 0) {
- if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0;
- v = z->huff_dc[th].values;
+ if (!stbi__build_huffman(z->huff_dc + th, sizes))
+ return 0;
+ v = z->huff_dc[th].values;
} else {
- if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0;
- v = z->huff_ac[th].values;
+ if (!stbi__build_huffman(z->huff_ac + th, sizes))
+ return 0;
+ v = z->huff_ac[th].values;
}
- for (i=0; i < n; ++i)
- v[i] = stbi__get8(z->s);
+ for (i = 0; i < n; ++i)
+ v[i] = stbi__get8(z->s);
if (tc != 0)
- stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th);
+ stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th);
L -= n;
- }
- return L==0;
- }
-
- // check for comment block or APP blocks
- if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
- L = stbi__get16be(z->s);
- if (L < 2) {
- if (m == 0xFE)
- return stbi__err("bad COM len","Corrupt JPEG");
- else
- return stbi__err("bad APP len","Corrupt JPEG");
- }
- L -= 2;
-
- if (m == 0xE0 && L >= 5) { // JFIF APP0 segment
- static const unsigned char tag[5] = {'J','F','I','F','\0'};
- int ok = 1;
- int i;
- for (i=0; i < 5; ++i)
- if (stbi__get8(z->s) != tag[i])
- ok = 0;
- L -= 5;
- if (ok)
- z->jfif = 1;
- } else if (m == 0xEE && L >= 12) { // Adobe APP14 segment
- static const unsigned char tag[6] = {'A','d','o','b','e','\0'};
- int ok = 1;
- int i;
- for (i=0; i < 6; ++i)
- if (stbi__get8(z->s) != tag[i])
- ok = 0;
- L -= 6;
- if (ok) {
- stbi__get8(z->s); // version
- stbi__get16be(z->s); // flags0
- stbi__get16be(z->s); // flags1
- z->app14_color_transform = stbi__get8(z->s); // color transform
+ }
+ return L == 0;
+ }
+
+ // check for comment block or APP blocks
+ if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
+ L = stbi__get16be(z->s);
+ if (L < 2) {
+ if (m == 0xFE)
+ return stbi__err("bad COM len", "Corrupt JPEG");
+ else
+ return stbi__err("bad APP len", "Corrupt JPEG");
+ }
+ L -= 2;
+
+ if (m == 0xE0 && L >= 5) { // JFIF APP0 segment
+ static const unsigned char tag[5] = {'J', 'F', 'I', 'F', '\0'};
+ int ok = 1;
+ int i;
+ for (i = 0; i < 5; ++i)
+ if (stbi__get8(z->s) != tag[i])
+ ok = 0;
+ L -= 5;
+ if (ok)
+ z->jfif = 1;
+ } else if (m == 0xEE && L >= 12) { // Adobe APP14 segment
+ static const unsigned char tag[6] = {'A', 'd', 'o', 'b', 'e', '\0'};
+ int ok = 1;
+ int i;
+ for (i = 0; i < 6; ++i)
+ if (stbi__get8(z->s) != tag[i])
+ ok = 0;
L -= 6;
- }
- }
+ if (ok) {
+ stbi__get8(z->s); // version
+ stbi__get16be(z->s); // flags0
+ stbi__get16be(z->s); // flags1
+ z->app14_color_transform = stbi__get8(z->s); // color transform
+ L -= 6;
+ }
+ }
- stbi__skip(z->s, L);
- return 1;
- }
+ stbi__skip(z->s, L);
+ return 1;
+ }
- return stbi__err("unknown marker","Corrupt JPEG");
+ return stbi__err("unknown marker", "Corrupt JPEG");
}
// after we see SOS
static int stbi__process_scan_header(stbi__jpeg *z)
{
- int i;
- int Ls = stbi__get16be(z->s);
- z->scan_n = stbi__get8(z->s);
- if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG");
- if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG");
- for (i=0; i < z->scan_n; ++i) {
- int id = stbi__get8(z->s), which;
- int q = stbi__get8(z->s);
- for (which = 0; which < z->s->img_n; ++which)
- if (z->img_comp[which].id == id)
- break;
- if (which == z->s->img_n) return 0; // no match
- z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG");
- z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG");
- z->order[i] = which;
- }
-
- {
- int aa;
- z->spec_start = stbi__get8(z->s);
- z->spec_end = stbi__get8(z->s); // should be 63, but might be 0
- aa = stbi__get8(z->s);
- z->succ_high = (aa >> 4);
- z->succ_low = (aa & 15);
- if (z->progressive) {
- if (z->spec_start > 63 || z->spec_end > 63 || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13)
- return stbi__err("bad SOS", "Corrupt JPEG");
- } else {
- if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG");
- if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG");
- z->spec_end = 63;
- }
- }
-
- return 1;
+ int i;
+ int Ls = stbi__get16be(z->s);
+ z->scan_n = stbi__get8(z->s);
+ if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int)z->s->img_n)
+ return stbi__err("bad SOS component count", "Corrupt JPEG");
+ if (Ls != 6 + 2 * z->scan_n)
+ return stbi__err("bad SOS len", "Corrupt JPEG");
+ for (i = 0; i < z->scan_n; ++i) {
+ int id = stbi__get8(z->s), which;
+ int q = stbi__get8(z->s);
+ for (which = 0; which < z->s->img_n; ++which)
+ if (z->img_comp[which].id == id)
+ break;
+ if (which == z->s->img_n)
+ return 0; // no match
+ z->img_comp[which].hd = q >> 4;
+ if (z->img_comp[which].hd > 3)
+ return stbi__err("bad DC huff", "Corrupt JPEG");
+ z->img_comp[which].ha = q & 15;
+ if (z->img_comp[which].ha > 3)
+ return stbi__err("bad AC huff", "Corrupt JPEG");
+ z->order[i] = which;
+ }
+
+ {
+ int aa;
+ z->spec_start = stbi__get8(z->s);
+ z->spec_end = stbi__get8(z->s); // should be 63, but might be 0
+ aa = stbi__get8(z->s);
+ z->succ_high = (aa >> 4);
+ z->succ_low = (aa & 15);
+ if (z->progressive) {
+ if (z->spec_start > 63 || z->spec_end > 63 ||
+ z->spec_start > z->spec_end || z->succ_high > 13 ||
+ z->succ_low > 13)
+ return stbi__err("bad SOS", "Corrupt JPEG");
+ } else {
+ if (z->spec_start != 0)
+ return stbi__err("bad SOS", "Corrupt JPEG");
+ if (z->succ_high != 0 || z->succ_low != 0)
+ return stbi__err("bad SOS", "Corrupt JPEG");
+ z->spec_end = 63;
+ }
+ }
+
+ return 1;
}
static int stbi__free_jpeg_components(stbi__jpeg *z, int ncomp, int why)
{
- int i;
- for (i=0; i < ncomp; ++i) {
- if (z->img_comp[i].raw_data) {
- STBI_FREE(z->img_comp[i].raw_data);
- z->img_comp[i].raw_data = NULL;
- z->img_comp[i].data = NULL;
- }
- if (z->img_comp[i].raw_coeff) {
- STBI_FREE(z->img_comp[i].raw_coeff);
- z->img_comp[i].raw_coeff = 0;
- z->img_comp[i].coeff = 0;
- }
- if (z->img_comp[i].linebuf) {
- STBI_FREE(z->img_comp[i].linebuf);
- z->img_comp[i].linebuf = NULL;
- }
- }
- return why;
+ int i;
+ for (i = 0; i < ncomp; ++i) {
+ if (z->img_comp[i].raw_data) {
+ STBI_FREE(z->img_comp[i].raw_data);
+ z->img_comp[i].raw_data = NULL;
+ z->img_comp[i].data = NULL;
+ }
+ if (z->img_comp[i].raw_coeff) {
+ STBI_FREE(z->img_comp[i].raw_coeff);
+ z->img_comp[i].raw_coeff = 0;
+ z->img_comp[i].coeff = 0;
+ }
+ if (z->img_comp[i].linebuf) {
+ STBI_FREE(z->img_comp[i].linebuf);
+ z->img_comp[i].linebuf = NULL;
+ }
+ }
+ return why;
}
static int stbi__process_frame_header(stbi__jpeg *z, int scan)
{
- stbi__context *s = z->s;
- int Lf,p,i,q, h_max=1,v_max=1,c;
- Lf = stbi__get16be(s); if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG
- p = stbi__get8(s); if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline
- s->img_y = stbi__get16be(s); if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG
- s->img_x = stbi__get16be(s); if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires
- c = stbi__get8(s);
- if (c != 3 && c != 1 && c != 4) return stbi__err("bad component count","Corrupt JPEG");
- s->img_n = c;
- for (i=0; i < c; ++i) {
- z->img_comp[i].data = NULL;
- z->img_comp[i].linebuf = NULL;
- }
-
- if (Lf != 8+3*s->img_n) return stbi__err("bad SOF len","Corrupt JPEG");
-
- z->rgb = 0;
- for (i=0; i < s->img_n; ++i) {
- static unsigned char rgb[3] = { 'R', 'G', 'B' };
- z->img_comp[i].id = stbi__get8(s);
- if (s->img_n == 3 && z->img_comp[i].id == rgb[i])
- ++z->rgb;
- q = stbi__get8(s);
- z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H","Corrupt JPEG");
- z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V","Corrupt JPEG");
- z->img_comp[i].tq = stbi__get8(s); if (z->img_comp[i].tq > 3) return stbi__err("bad TQ","Corrupt JPEG");
- }
-
- if (scan != STBI__SCAN_load) return 1;
-
- if (!stbi__mad3sizes_valid(s->img_x, s->img_y, s->img_n, 0)) return stbi__err("too large", "Image too large to decode");
-
- for (i=0; i < s->img_n; ++i) {
- if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h;
- if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
- }
-
- // compute interleaved mcu info
- z->img_h_max = h_max;
- z->img_v_max = v_max;
- z->img_mcu_w = h_max * 8;
- z->img_mcu_h = v_max * 8;
- // these sizes can't be more than 17 bits
- z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w;
- z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h;
-
- for (i=0; i < s->img_n; ++i) {
- // number of effective pixels (e.g. for non-interleaved MCU)
- z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max;
- z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max;
- // to simplify generation, we'll allocate enough memory to decode
- // the bogus oversized data from using interleaved MCUs and their
- // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't
- // discard the extra data until colorspace conversion
- //
- // img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked earlier)
- // so these muls can't overflow with 32-bit ints (which we require)
- z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8;
- z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8;
- z->img_comp[i].coeff = 0;
- z->img_comp[i].raw_coeff = 0;
- z->img_comp[i].linebuf = NULL;
- z->img_comp[i].raw_data = stbi__malloc_mad2(z->img_comp[i].w2, z->img_comp[i].h2, 15);
- if (z->img_comp[i].raw_data == NULL)
- return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory"));
- // align blocks for idct using mmx/sse
- z->img_comp[i].data = (stbi_uc*) (((size_t) z->img_comp[i].raw_data + 15) & ~15);
- if (z->progressive) {
- // w2, h2 are multiples of 8 (see above)
- z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8;
- z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8;
- z->img_comp[i].raw_coeff = stbi__malloc_mad3(z->img_comp[i].w2, z->img_comp[i].h2, sizeof(short), 15);
- if (z->img_comp[i].raw_coeff == NULL)
- return stbi__free_jpeg_components(z, i+1, stbi__err("outofmem", "Out of memory"));
- z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15);
- }
- }
-
- return 1;
+ stbi__context *s = z->s;
+ int Lf, p, i, q, h_max = 1, v_max = 1, c;
+ Lf = stbi__get16be(s);
+ if (Lf < 11)
+ return stbi__err("bad SOF len", "Corrupt JPEG"); // JPEG
+ p = stbi__get8(s);
+ if (p != 8)
+ return stbi__err(
+ "only 8-bit",
+ "JPEG format not supported: 8-bit only"); // JPEG baseline
+ s->img_y = stbi__get16be(s);
+ if (s->img_y == 0)
+ return stbi__err(
+ "no header height",
+ "JPEG format not supported: delayed height"); // Legal, but we don't
+ // handle it--but
+ // neither does IJG
+ s->img_x = stbi__get16be(s);
+ if (s->img_x == 0)
+ return stbi__err("0 width", "Corrupt JPEG"); // JPEG requires
+ c = stbi__get8(s);
+ if (c != 3 && c != 1 && c != 4)
+ return stbi__err("bad component count", "Corrupt JPEG");
+ s->img_n = c;
+ for (i = 0; i < c; ++i) {
+ z->img_comp[i].data = NULL;
+ z->img_comp[i].linebuf = NULL;
+ }
+
+ if (Lf != 8 + 3 * s->img_n)
+ return stbi__err("bad SOF len", "Corrupt JPEG");
+
+ z->rgb = 0;
+ for (i = 0; i < s->img_n; ++i) {
+ static unsigned char rgb[3] = {'R', 'G', 'B'};
+ z->img_comp[i].id = stbi__get8(s);
+ if (s->img_n == 3 && z->img_comp[i].id == rgb[i])
+ ++z->rgb;
+ q = stbi__get8(s);
+ z->img_comp[i].h = (q >> 4);
+ if (!z->img_comp[i].h || z->img_comp[i].h > 4)
+ return stbi__err("bad H", "Corrupt JPEG");
+ z->img_comp[i].v = q & 15;
+ if (!z->img_comp[i].v || z->img_comp[i].v > 4)
+ return stbi__err("bad V", "Corrupt JPEG");
+ z->img_comp[i].tq = stbi__get8(s);
+ if (z->img_comp[i].tq > 3)
+ return stbi__err("bad TQ", "Corrupt JPEG");
+ }
+
+ if (scan != STBI__SCAN_load)
+ return 1;
+
+ if (!stbi__mad3sizes_valid(s->img_x, s->img_y, s->img_n, 0))
+ return stbi__err("too large", "Image too large to decode");
+
+ for (i = 0; i < s->img_n; ++i) {
+ if (z->img_comp[i].h > h_max)
+ h_max = z->img_comp[i].h;
+ if (z->img_comp[i].v > v_max)
+ v_max = z->img_comp[i].v;
+ }
+
+ // compute interleaved mcu info
+ z->img_h_max = h_max;
+ z->img_v_max = v_max;
+ z->img_mcu_w = h_max * 8;
+ z->img_mcu_h = v_max * 8;
+ // these sizes can't be more than 17 bits
+ z->img_mcu_x = (s->img_x + z->img_mcu_w - 1) / z->img_mcu_w;
+ z->img_mcu_y = (s->img_y + z->img_mcu_h - 1) / z->img_mcu_h;
+
+ for (i = 0; i < s->img_n; ++i) {
+ // number of effective pixels (e.g. for non-interleaved MCU)
+ z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max - 1) / h_max;
+ z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max - 1) / v_max;
+ // to simplify generation, we'll allocate enough memory to decode
+ // the bogus oversized data from using interleaved MCUs and their
+ // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't
+ // discard the extra data until colorspace conversion
+ //
+ // img_mcu_x, img_mcu_y: <=17 bits; comp[i].h and .v are <=4 (checked
+ // earlier) so these muls can't overflow with 32-bit ints (which we
+ // require)
+ z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8;
+ z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8;
+ z->img_comp[i].coeff = 0;
+ z->img_comp[i].raw_coeff = 0;
+ z->img_comp[i].linebuf = NULL;
+ z->img_comp[i].raw_data =
+ stbi__malloc_mad2(z->img_comp[i].w2, z->img_comp[i].h2, 15);
+ if (z->img_comp[i].raw_data == NULL)
+ return stbi__free_jpeg_components(
+ z, i + 1, stbi__err("outofmem", "Out of memory"));
+ // align blocks for idct using mmx/sse
+ z->img_comp[i].data =
+ (stbi_uc *)(((size_t)z->img_comp[i].raw_data + 15) & ~15);
+ if (z->progressive) {
+ // w2, h2 are multiples of 8 (see above)
+ z->img_comp[i].coeff_w = z->img_comp[i].w2 / 8;
+ z->img_comp[i].coeff_h = z->img_comp[i].h2 / 8;
+ z->img_comp[i].raw_coeff = stbi__malloc_mad3(
+ z->img_comp[i].w2, z->img_comp[i].h2, sizeof(short), 15);
+ if (z->img_comp[i].raw_coeff == NULL)
+ return stbi__free_jpeg_components(
+ z, i + 1, stbi__err("outofmem", "Out of memory"));
+ z->img_comp[i].coeff =
+ (short *)(((size_t)z->img_comp[i].raw_coeff + 15) & ~15);
+ }
+ }
+
+ return 1;
}
// use comparisons since in some cases we handle more than one case (e.g. SOF)
-#define stbi__DNL(x) ((x) == 0xdc)
-#define stbi__SOI(x) ((x) == 0xd8)
-#define stbi__EOI(x) ((x) == 0xd9)
-#define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2)
-#define stbi__SOS(x) ((x) == 0xda)
+#define stbi__DNL(x) ((x) == 0xdc)
+#define stbi__SOI(x) ((x) == 0xd8)
+#define stbi__EOI(x) ((x) == 0xd9)
+#define stbi__SOF(x) ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2)
+#define stbi__SOS(x) ((x) == 0xda)
-#define stbi__SOF_progressive(x) ((x) == 0xc2)
+#define stbi__SOF_progressive(x) ((x) == 0xc2)
static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan)
{
- int m;
- z->jfif = 0;
- z->app14_color_transform = -1; // valid values are 0,1,2
- z->marker = STBI__MARKER_none; // initialize cached marker to empty
- m = stbi__get_marker(z);
- if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG");
- if (scan == STBI__SCAN_type) return 1;
- m = stbi__get_marker(z);
- while (!stbi__SOF(m)) {
- if (!stbi__process_marker(z,m)) return 0;
- m = stbi__get_marker(z);
- while (m == STBI__MARKER_none) {
- // some files have extra padding after their blocks, so ok, we'll scan
- if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG");
- m = stbi__get_marker(z);
- }
- }
- z->progressive = stbi__SOF_progressive(m);
- if (!stbi__process_frame_header(z, scan)) return 0;
- return 1;
+ int m;
+ z->jfif = 0;
+ z->app14_color_transform = -1; // valid values are 0,1,2
+ z->marker = STBI__MARKER_none; // initialize cached marker to empty
+ m = stbi__get_marker(z);
+ if (!stbi__SOI(m))
+ return stbi__err("no SOI", "Corrupt JPEG");
+ if (scan == STBI__SCAN_type)
+ return 1;
+ m = stbi__get_marker(z);
+ while (!stbi__SOF(m)) {
+ if (!stbi__process_marker(z, m))
+ return 0;
+ m = stbi__get_marker(z);
+ while (m == STBI__MARKER_none) {
+ // some files have extra padding after their blocks, so ok, we'll
+ // scan
+ if (stbi__at_eof(z->s))
+ return stbi__err("no SOF", "Corrupt JPEG");
+ m = stbi__get_marker(z);
+ }
+ }
+ z->progressive = stbi__SOF_progressive(m);
+ if (!stbi__process_frame_header(z, scan))
+ return 0;
+ return 1;
}
// decode image to YCbCr format
static int stbi__decode_jpeg_image(stbi__jpeg *j)
{
- int m;
- for (m = 0; m < 4; m++) {
- j->img_comp[m].raw_data = NULL;
- j->img_comp[m].raw_coeff = NULL;
- }
- j->restart_interval = 0;
- if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0;
- m = stbi__get_marker(j);
- while (!stbi__EOI(m)) {
- if (stbi__SOS(m)) {
- if (!stbi__process_scan_header(j)) return 0;
- if (!stbi__parse_entropy_coded_data(j)) return 0;
- if (j->marker == STBI__MARKER_none ) {
- // handle 0s at the end of image data from IP Kamera 9060
- while (!stbi__at_eof(j->s)) {
- int x = stbi__get8(j->s);
- if (x == 255) {
- j->marker = stbi__get8(j->s);
- break;
- }
+ int m;
+ for (m = 0; m < 4; m++) {
+ j->img_comp[m].raw_data = NULL;
+ j->img_comp[m].raw_coeff = NULL;
+ }
+ j->restart_interval = 0;
+ if (!stbi__decode_jpeg_header(j, STBI__SCAN_load))
+ return 0;
+ m = stbi__get_marker(j);
+ while (!stbi__EOI(m)) {
+ if (stbi__SOS(m)) {
+ if (!stbi__process_scan_header(j))
+ return 0;
+ if (!stbi__parse_entropy_coded_data(j))
+ return 0;
+ if (j->marker == STBI__MARKER_none) {
+ // handle 0s at the end of image data from IP Kamera 9060
+ while (!stbi__at_eof(j->s)) {
+ int x = stbi__get8(j->s);
+ if (x == 255) {
+ j->marker = stbi__get8(j->s);
+ break;
+ }
+ }
+ // if we reach eof without hitting a marker, stbi__get_marker()
+ // below will fail and we'll eventually return 0
}
- // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0
- }
- } else if (stbi__DNL(m)) {
- int Ld = stbi__get16be(j->s);
- stbi__uint32 NL = stbi__get16be(j->s);
- if (Ld != 4) stbi__err("bad DNL len", "Corrupt JPEG");
- if (NL != j->s->img_y) stbi__err("bad DNL height", "Corrupt JPEG");
- } else {
- if (!stbi__process_marker(j, m)) return 0;
- }
- m = stbi__get_marker(j);
- }
- if (j->progressive)
- stbi__jpeg_finish(j);
- return 1;
+ } else if (stbi__DNL(m)) {
+ int Ld = stbi__get16be(j->s);
+ stbi__uint32 NL = stbi__get16be(j->s);
+ if (Ld != 4)
+ stbi__err("bad DNL len", "Corrupt JPEG");
+ if (NL != j->s->img_y)
+ stbi__err("bad DNL height", "Corrupt JPEG");
+ } else {
+ if (!stbi__process_marker(j, m))
+ return 0;
+ }
+ m = stbi__get_marker(j);
+ }
+ if (j->progressive)
+ stbi__jpeg_finish(j);
+ return 1;
}
// static jfif-centered resampling (across block boundaries)
typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_uc *in1,
- int w, int hs);
+ int w, int hs);
-#define stbi__div4(x) ((stbi_uc) ((x) >> 2))
+#define stbi__div4(x) ((stbi_uc)((x) >> 2))
-static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far,
+ int w, int hs)
{
- STBI_NOTUSED(out);
- STBI_NOTUSED(in_far);
- STBI_NOTUSED(w);
- STBI_NOTUSED(hs);
- return in_near;
+ STBI_NOTUSED(out);
+ STBI_NOTUSED(in_far);
+ STBI_NOTUSED(w);
+ STBI_NOTUSED(hs);
+ return in_near;
}
-static stbi_uc* stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+static stbi_uc *stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near,
+ stbi_uc *in_far, int w, int hs)
{
- // need to generate two samples vertically for every one in input
- int i;
- STBI_NOTUSED(hs);
- for (i=0; i < w; ++i)
- out[i] = stbi__div4(3*in_near[i] + in_far[i] + 2);
- return out;
+ // need to generate two samples vertically for every one in input
+ int i;
+ STBI_NOTUSED(hs);
+ for (i = 0; i < w; ++i)
+ out[i] = stbi__div4(3 * in_near[i] + in_far[i] + 2);
+ return out;
}
-static stbi_uc* stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+static stbi_uc *stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near,
+ stbi_uc *in_far, int w, int hs)
{
- // need to generate two samples horizontally for every one in input
- int i;
- stbi_uc *input = in_near;
+ // need to generate two samples horizontally for every one in input
+ int i;
+ stbi_uc *input = in_near;
- if (w == 1) {
- // if only one sample, can't do any interpolation
- out[0] = out[1] = input[0];
- return out;
- }
+ if (w == 1) {
+ // if only one sample, can't do any interpolation
+ out[0] = out[1] = input[0];
+ return out;
+ }
- out[0] = input[0];
- out[1] = stbi__div4(input[0]*3 + input[1] + 2);
- for (i=1; i < w-1; ++i) {
- int n = 3*input[i]+2;
- out[i*2+0] = stbi__div4(n+input[i-1]);
- out[i*2+1] = stbi__div4(n+input[i+1]);
- }
- out[i*2+0] = stbi__div4(input[w-2]*3 + input[w-1] + 2);
- out[i*2+1] = input[w-1];
+ out[0] = input[0];
+ out[1] = stbi__div4(input[0] * 3 + input[1] + 2);
+ for (i = 1; i < w - 1; ++i) {
+ int n = 3 * input[i] + 2;
+ out[i * 2 + 0] = stbi__div4(n + input[i - 1]);
+ out[i * 2 + 1] = stbi__div4(n + input[i + 1]);
+ }
+ out[i * 2 + 0] = stbi__div4(input[w - 2] * 3 + input[w - 1] + 2);
+ out[i * 2 + 1] = input[w - 1];
- STBI_NOTUSED(in_far);
- STBI_NOTUSED(hs);
+ STBI_NOTUSED(in_far);
+ STBI_NOTUSED(hs);
- return out;
+ return out;
}
-#define stbi__div16(x) ((stbi_uc) ((x) >> 4))
+#define stbi__div16(x) ((stbi_uc)((x) >> 4))
-static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near,
+ stbi_uc *in_far, int w, int hs)
{
- // need to generate 2x2 samples for every one in input
- int i,t0,t1;
- if (w == 1) {
- out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
- return out;
- }
+ // need to generate 2x2 samples for every one in input
+ int i, t0, t1;
+ if (w == 1) {
+ out[0] = out[1] = stbi__div4(3 * in_near[0] + in_far[0] + 2);
+ return out;
+ }
- t1 = 3*in_near[0] + in_far[0];
- out[0] = stbi__div4(t1+2);
- for (i=1; i < w; ++i) {
- t0 = t1;
- t1 = 3*in_near[i]+in_far[i];
- out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
- out[i*2 ] = stbi__div16(3*t1 + t0 + 8);
- }
- out[w*2-1] = stbi__div4(t1+2);
+ t1 = 3 * in_near[0] + in_far[0];
+ out[0] = stbi__div4(t1 + 2);
+ for (i = 1; i < w; ++i) {
+ t0 = t1;
+ t1 = 3 * in_near[i] + in_far[i];
+ out[i * 2 - 1] = stbi__div16(3 * t0 + t1 + 8);
+ out[i * 2] = stbi__div16(3 * t1 + t0 + 8);
+ }
+ out[w * 2 - 1] = stbi__div4(t1 + 2);
- STBI_NOTUSED(hs);
+ STBI_NOTUSED(hs);
- return out;
+ return out;
}
#if defined(STBI_SSE2) || defined(STBI_NEON)
-static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near,
+ stbi_uc *in_far, int w, int hs)
{
- // need to generate 2x2 samples for every one in input
- int i=0,t0,t1;
+ // need to generate 2x2 samples for every one in input
+ int i = 0, t0, t1;
- if (w == 1) {
- out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
- return out;
- }
+ if (w == 1) {
+ out[0] = out[1] = stbi__div4(3 * in_near[0] + in_far[0] + 2);
+ return out;
+ }
- t1 = 3*in_near[0] + in_far[0];
- // process groups of 8 pixels for as long as we can.
- // note we can't handle the last pixel in a row in this loop
- // because we need to handle the filter boundary conditions.
- for (; i < ((w-1) & ~7); i += 8) {
+ t1 = 3 * in_near[0] + in_far[0];
+ // process groups of 8 pixels for as long as we can.
+ // note we can't handle the last pixel in a row in this loop
+ // because we need to handle the filter boundary conditions.
+ for (; i < ((w - 1) & ~7); i += 8) {
#if defined(STBI_SSE2)
- // load and perform the vertical filtering pass
- // this uses 3*x + y = 4*x + (y - x)
- __m128i zero = _mm_setzero_si128();
- __m128i farb = _mm_loadl_epi64((__m128i *) (in_far + i));
- __m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i));
- __m128i farw = _mm_unpacklo_epi8(farb, zero);
- __m128i nearw = _mm_unpacklo_epi8(nearb, zero);
- __m128i diff = _mm_sub_epi16(farw, nearw);
- __m128i nears = _mm_slli_epi16(nearw, 2);
- __m128i curr = _mm_add_epi16(nears, diff); // current row
-
- // horizontal filter works the same based on shifted vers of current
- // row. "prev" is current row shifted right by 1 pixel; we need to
- // insert the previous pixel value (from t1).
- // "next" is current row shifted left by 1 pixel, with first pixel
- // of next block of 8 pixels added in.
- __m128i prv0 = _mm_slli_si128(curr, 2);
- __m128i nxt0 = _mm_srli_si128(curr, 2);
- __m128i prev = _mm_insert_epi16(prv0, t1, 0);
- __m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7);
-
- // horizontal filter, polyphase implementation since it's convenient:
- // even pixels = 3*cur + prev = cur*4 + (prev - cur)
- // odd pixels = 3*cur + next = cur*4 + (next - cur)
- // note the shared term.
- __m128i bias = _mm_set1_epi16(8);
- __m128i curs = _mm_slli_epi16(curr, 2);
- __m128i prvd = _mm_sub_epi16(prev, curr);
- __m128i nxtd = _mm_sub_epi16(next, curr);
- __m128i curb = _mm_add_epi16(curs, bias);
- __m128i even = _mm_add_epi16(prvd, curb);
- __m128i odd = _mm_add_epi16(nxtd, curb);
-
- // interleave even and odd pixels, then undo scaling.
- __m128i int0 = _mm_unpacklo_epi16(even, odd);
- __m128i int1 = _mm_unpackhi_epi16(even, odd);
- __m128i de0 = _mm_srli_epi16(int0, 4);
- __m128i de1 = _mm_srli_epi16(int1, 4);
-
- // pack and write output
- __m128i outv = _mm_packus_epi16(de0, de1);
- _mm_storeu_si128((__m128i *) (out + i*2), outv);
+ // load and perform the vertical filtering pass
+ // this uses 3*x + y = 4*x + (y - x)
+ __m128i zero = _mm_setzero_si128();
+ __m128i farb = _mm_loadl_epi64((__m128i *)(in_far + i));
+ __m128i nearb = _mm_loadl_epi64((__m128i *)(in_near + i));
+ __m128i farw = _mm_unpacklo_epi8(farb, zero);
+ __m128i nearw = _mm_unpacklo_epi8(nearb, zero);
+ __m128i diff = _mm_sub_epi16(farw, nearw);
+ __m128i nears = _mm_slli_epi16(nearw, 2);
+ __m128i curr = _mm_add_epi16(nears, diff); // current row
+
+ // horizontal filter works the same based on shifted vers of current
+ // row. "prev" is current row shifted right by 1 pixel; we need to
+ // insert the previous pixel value (from t1).
+ // "next" is current row shifted left by 1 pixel, with first pixel
+ // of next block of 8 pixels added in.
+ __m128i prv0 = _mm_slli_si128(curr, 2);
+ __m128i nxt0 = _mm_srli_si128(curr, 2);
+ __m128i prev = _mm_insert_epi16(prv0, t1, 0);
+ __m128i next =
+ _mm_insert_epi16(nxt0, 3 * in_near[i + 8] + in_far[i + 8], 7);
+
+ // horizontal filter, polyphase implementation since it's convenient:
+ // even pixels = 3*cur + prev = cur*4 + (prev - cur)
+ // odd pixels = 3*cur + next = cur*4 + (next - cur)
+ // note the shared term.
+ __m128i bias = _mm_set1_epi16(8);
+ __m128i curs = _mm_slli_epi16(curr, 2);
+ __m128i prvd = _mm_sub_epi16(prev, curr);
+ __m128i nxtd = _mm_sub_epi16(next, curr);
+ __m128i curb = _mm_add_epi16(curs, bias);
+ __m128i even = _mm_add_epi16(prvd, curb);
+ __m128i odd = _mm_add_epi16(nxtd, curb);
+
+ // interleave even and odd pixels, then undo scaling.
+ __m128i int0 = _mm_unpacklo_epi16(even, odd);
+ __m128i int1 = _mm_unpackhi_epi16(even, odd);
+ __m128i de0 = _mm_srli_epi16(int0, 4);
+ __m128i de1 = _mm_srli_epi16(int1, 4);
+
+ // pack and write output
+ __m128i outv = _mm_packus_epi16(de0, de1);
+ _mm_storeu_si128((__m128i *)(out + i * 2), outv);
#elif defined(STBI_NEON)
- // load and perform the vertical filtering pass
- // this uses 3*x + y = 4*x + (y - x)
- uint8x8_t farb = vld1_u8(in_far + i);
- uint8x8_t nearb = vld1_u8(in_near + i);
- int16x8_t diff = vreinterpretq_s16_u16(vsubl_u8(farb, nearb));
- int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2));
- int16x8_t curr = vaddq_s16(nears, diff); // current row
-
- // horizontal filter works the same based on shifted vers of current
- // row. "prev" is current row shifted right by 1 pixel; we need to
- // insert the previous pixel value (from t1).
- // "next" is current row shifted left by 1 pixel, with first pixel
- // of next block of 8 pixels added in.
- int16x8_t prv0 = vextq_s16(curr, curr, 7);
- int16x8_t nxt0 = vextq_s16(curr, curr, 1);
- int16x8_t prev = vsetq_lane_s16(t1, prv0, 0);
- int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7);
-
- // horizontal filter, polyphase implementation since it's convenient:
- // even pixels = 3*cur + prev = cur*4 + (prev - cur)
- // odd pixels = 3*cur + next = cur*4 + (next - cur)
- // note the shared term.
- int16x8_t curs = vshlq_n_s16(curr, 2);
- int16x8_t prvd = vsubq_s16(prev, curr);
- int16x8_t nxtd = vsubq_s16(next, curr);
- int16x8_t even = vaddq_s16(curs, prvd);
- int16x8_t odd = vaddq_s16(curs, nxtd);
-
- // undo scaling and round, then store with even/odd phases interleaved
- uint8x8x2_t o;
- o.val[0] = vqrshrun_n_s16(even, 4);
- o.val[1] = vqrshrun_n_s16(odd, 4);
- vst2_u8(out + i*2, o);
+ // load and perform the vertical filtering pass
+ // this uses 3*x + y = 4*x + (y - x)
+ uint8x8_t farb = vld1_u8(in_far + i);
+ uint8x8_t nearb = vld1_u8(in_near + i);
+ int16x8_t diff = vreinterpretq_s16_u16(vsubl_u8(farb, nearb));
+ int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2));
+ int16x8_t curr = vaddq_s16(nears, diff); // current row
+
+ // horizontal filter works the same based on shifted vers of current
+ // row. "prev" is current row shifted right by 1 pixel; we need to
+ // insert the previous pixel value (from t1).
+ // "next" is current row shifted left by 1 pixel, with first pixel
+ // of next block of 8 pixels added in.
+ int16x8_t prv0 = vextq_s16(curr, curr, 7);
+ int16x8_t nxt0 = vextq_s16(curr, curr, 1);
+ int16x8_t prev = vsetq_lane_s16(t1, prv0, 0);
+ int16x8_t next =
+ vsetq_lane_s16(3 * in_near[i + 8] + in_far[i + 8], nxt0, 7);
+
+ // horizontal filter, polyphase implementation since it's convenient:
+ // even pixels = 3*cur + prev = cur*4 + (prev - cur)
+ // odd pixels = 3*cur + next = cur*4 + (next - cur)
+ // note the shared term.
+ int16x8_t curs = vshlq_n_s16(curr, 2);
+ int16x8_t prvd = vsubq_s16(prev, curr);
+ int16x8_t nxtd = vsubq_s16(next, curr);
+ int16x8_t even = vaddq_s16(curs, prvd);
+ int16x8_t odd = vaddq_s16(curs, nxtd);
+
+ // undo scaling and round, then store with even/odd phases interleaved
+ uint8x8x2_t o;
+ o.val[0] = vqrshrun_n_s16(even, 4);
+ o.val[1] = vqrshrun_n_s16(odd, 4);
+ vst2_u8(out + i * 2, o);
#endif
- // "previous" value for next iter
- t1 = 3*in_near[i+7] + in_far[i+7];
- }
+ // "previous" value for next iter
+ t1 = 3 * in_near[i + 7] + in_far[i + 7];
+ }
- t0 = t1;
- t1 = 3*in_near[i] + in_far[i];
- out[i*2] = stbi__div16(3*t1 + t0 + 8);
+ t0 = t1;
+ t1 = 3 * in_near[i] + in_far[i];
+ out[i * 2] = stbi__div16(3 * t1 + t0 + 8);
- for (++i; i < w; ++i) {
- t0 = t1;
- t1 = 3*in_near[i]+in_far[i];
- out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
- out[i*2 ] = stbi__div16(3*t1 + t0 + 8);
- }
- out[w*2-1] = stbi__div4(t1+2);
+ for (++i; i < w; ++i) {
+ t0 = t1;
+ t1 = 3 * in_near[i] + in_far[i];
+ out[i * 2 - 1] = stbi__div16(3 * t0 + t1 + 8);
+ out[i * 2] = stbi__div16(3 * t1 + t0 + 8);
+ }
+ out[w * 2 - 1] = stbi__div4(t1 + 2);
- STBI_NOTUSED(hs);
+ STBI_NOTUSED(hs);
- return out;
+ return out;
}
#endif
-static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near,
+ stbi_uc *in_far, int w, int hs)
{
- // resample with nearest-neighbor
- int i,j;
- STBI_NOTUSED(in_far);
- for (i=0; i < w; ++i)
- for (j=0; j < hs; ++j)
- out[i*hs+j] = in_near[i];
- return out;
+ // resample with nearest-neighbor
+ int i, j;
+ STBI_NOTUSED(in_far);
+ for (i = 0; i < w; ++i)
+ for (j = 0; j < hs; ++j)
+ out[i * hs + j] = in_near[i];
+ return out;
}
// this is a reduced-precision calculation of YCbCr-to-RGB introduced
// to make sure the code produces the same results in both SIMD and scalar
-#define stbi__float2fixed(x) (((int) ((x) * 4096.0f + 0.5f)) << 8)
-static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step)
-{
- int i;
- for (i=0; i < count; ++i) {
- int y_fixed = (y[i] << 20) + (1<<19); // rounding
- int r,g,b;
- int cr = pcr[i] - 128;
- int cb = pcb[i] - 128;
- r = y_fixed + cr* stbi__float2fixed(1.40200f);
- g = y_fixed + (cr*-stbi__float2fixed(0.71414f)) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000);
- b = y_fixed + cb* stbi__float2fixed(1.77200f);
- r >>= 20;
- g >>= 20;
- b >>= 20;
- if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
- if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
- if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
- out[0] = (stbi_uc)r;
- out[1] = (stbi_uc)g;
- out[2] = (stbi_uc)b;
- out[3] = 255;
- out += step;
- }
+#define stbi__float2fixed(x) (((int)((x)*4096.0f + 0.5f)) << 8)
+static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y,
+ const stbi_uc *pcb, const stbi_uc *pcr,
+ int count, int step)
+{
+ int i;
+ for (i = 0; i < count; ++i) {
+ int y_fixed = (y[i] << 20) + (1 << 19); // rounding
+ int r, g, b;
+ int cr = pcr[i] - 128;
+ int cb = pcb[i] - 128;
+ r = y_fixed + cr * stbi__float2fixed(1.40200f);
+ g = y_fixed + (cr * -stbi__float2fixed(0.71414f)) +
+ ((cb * -stbi__float2fixed(0.34414f)) & 0xffff0000);
+ b = y_fixed + cb * stbi__float2fixed(1.77200f);
+ r >>= 20;
+ g >>= 20;
+ b >>= 20;
+ if ((unsigned)r > 255) {
+ if (r < 0)
+ r = 0;
+ else
+ r = 255;
+ }
+ if ((unsigned)g > 255) {
+ if (g < 0)
+ g = 0;
+ else
+ g = 255;
+ }
+ if ((unsigned)b > 255) {
+ if (b < 0)
+ b = 0;
+ else
+ b = 255;
+ }
+ out[0] = (stbi_uc)r;
+ out[1] = (stbi_uc)g;
+ out[2] = (stbi_uc)b;
+ out[3] = 255;
+ out += step;
+ }
}
#if defined(STBI_SSE2) || defined(STBI_NEON)
-static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb, stbi_uc const *pcr, int count, int step)
+static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y,
+ stbi_uc const *pcb, stbi_uc const *pcr,
+ int count, int step)
{
- int i = 0;
+ int i = 0;
#ifdef STBI_SSE2
- // step == 3 is pretty ugly on the final interleave, and i'm not convinced
- // it's useful in practice (you wouldn't use it for textures, for example).
- // so just accelerate step == 4 case.
- if (step == 4) {
- // this is a fairly straightforward implementation and not super-optimized.
- __m128i signflip = _mm_set1_epi8(-0x80);
- __m128i cr_const0 = _mm_set1_epi16( (short) ( 1.40200f*4096.0f+0.5f));
- __m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f));
- __m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f));
- __m128i cb_const1 = _mm_set1_epi16( (short) ( 1.77200f*4096.0f+0.5f));
- __m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128);
- __m128i xw = _mm_set1_epi16(255); // alpha channel
-
- for (; i+7 < count; i += 8) {
- // load
- __m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i));
- __m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i));
- __m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i));
- __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128
- __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128
-
- // unpack to short (and left-shift cr, cb by 8)
- __m128i yw = _mm_unpacklo_epi8(y_bias, y_bytes);
- __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased);
- __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased);
-
- // color transform
- __m128i yws = _mm_srli_epi16(yw, 4);
- __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw);
- __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw);
- __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1);
- __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1);
- __m128i rws = _mm_add_epi16(cr0, yws);
- __m128i gwt = _mm_add_epi16(cb0, yws);
- __m128i bws = _mm_add_epi16(yws, cb1);
- __m128i gws = _mm_add_epi16(gwt, cr1);
-
- // descale
- __m128i rw = _mm_srai_epi16(rws, 4);
- __m128i bw = _mm_srai_epi16(bws, 4);
- __m128i gw = _mm_srai_epi16(gws, 4);
-
- // back to byte, set up for transpose
- __m128i brb = _mm_packus_epi16(rw, bw);
- __m128i gxb = _mm_packus_epi16(gw, xw);
-
- // transpose to interleave channels
- __m128i t0 = _mm_unpacklo_epi8(brb, gxb);
- __m128i t1 = _mm_unpackhi_epi8(brb, gxb);
- __m128i o0 = _mm_unpacklo_epi16(t0, t1);
- __m128i o1 = _mm_unpackhi_epi16(t0, t1);
-
- // store
- _mm_storeu_si128((__m128i *) (out + 0), o0);
- _mm_storeu_si128((__m128i *) (out + 16), o1);
- out += 32;
- }
- }
+ // step == 3 is pretty ugly on the final interleave, and i'm not convinced
+ // it's useful in practice (you wouldn't use it for textures, for example).
+ // so just accelerate step == 4 case.
+ if (step == 4) {
+ // this is a fairly straightforward implementation and not
+ // super-optimized.
+ __m128i signflip = _mm_set1_epi8(-0x80);
+ __m128i cr_const0 = _mm_set1_epi16((short)(1.40200f * 4096.0f + 0.5f));
+ __m128i cr_const1 = _mm_set1_epi16(-(short)(0.71414f * 4096.0f + 0.5f));
+ __m128i cb_const0 = _mm_set1_epi16(-(short)(0.34414f * 4096.0f + 0.5f));
+ __m128i cb_const1 = _mm_set1_epi16((short)(1.77200f * 4096.0f + 0.5f));
+ __m128i y_bias = _mm_set1_epi8((char)(unsigned char)128);
+ __m128i xw = _mm_set1_epi16(255); // alpha channel
+
+ for (; i + 7 < count; i += 8) {
+ // load
+ __m128i y_bytes = _mm_loadl_epi64((__m128i *)(y + i));
+ __m128i cr_bytes = _mm_loadl_epi64((__m128i *)(pcr + i));
+ __m128i cb_bytes = _mm_loadl_epi64((__m128i *)(pcb + i));
+ __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128
+ __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128
+
+ // unpack to short (and left-shift cr, cb by 8)
+ __m128i yw = _mm_unpacklo_epi8(y_bias, y_bytes);
+ __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased);
+ __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased);
+
+ // color transform
+ __m128i yws = _mm_srli_epi16(yw, 4);
+ __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw);
+ __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw);
+ __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1);
+ __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1);
+ __m128i rws = _mm_add_epi16(cr0, yws);
+ __m128i gwt = _mm_add_epi16(cb0, yws);
+ __m128i bws = _mm_add_epi16(yws, cb1);
+ __m128i gws = _mm_add_epi16(gwt, cr1);
+
+ // descale
+ __m128i rw = _mm_srai_epi16(rws, 4);
+ __m128i bw = _mm_srai_epi16(bws, 4);
+ __m128i gw = _mm_srai_epi16(gws, 4);
+
+ // back to byte, set up for transpose
+ __m128i brb = _mm_packus_epi16(rw, bw);
+ __m128i gxb = _mm_packus_epi16(gw, xw);
+
+ // transpose to interleave channels
+ __m128i t0 = _mm_unpacklo_epi8(brb, gxb);
+ __m128i t1 = _mm_unpackhi_epi8(brb, gxb);
+ __m128i o0 = _mm_unpacklo_epi16(t0, t1);
+ __m128i o1 = _mm_unpackhi_epi16(t0, t1);
+
+ // store
+ _mm_storeu_si128((__m128i *)(out + 0), o0);
+ _mm_storeu_si128((__m128i *)(out + 16), o1);
+ out += 32;
+ }
+ }
#endif
#ifdef STBI_NEON
- // in this version, step=3 support would be easy to add. but is there demand?
- if (step == 4) {
- // this is a fairly straightforward implementation and not super-optimized.
- uint8x8_t signflip = vdup_n_u8(0x80);
- int16x8_t cr_const0 = vdupq_n_s16( (short) ( 1.40200f*4096.0f+0.5f));
- int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f));
- int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f));
- int16x8_t cb_const1 = vdupq_n_s16( (short) ( 1.77200f*4096.0f+0.5f));
-
- for (; i+7 < count; i += 8) {
- // load
- uint8x8_t y_bytes = vld1_u8(y + i);
- uint8x8_t cr_bytes = vld1_u8(pcr + i);
- uint8x8_t cb_bytes = vld1_u8(pcb + i);
- int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip));
- int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip));
-
- // expand to s16
- int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4));
- int16x8_t crw = vshll_n_s8(cr_biased, 7);
- int16x8_t cbw = vshll_n_s8(cb_biased, 7);
-
- // color transform
- int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0);
- int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0);
- int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1);
- int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1);
- int16x8_t rws = vaddq_s16(yws, cr0);
- int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1);
- int16x8_t bws = vaddq_s16(yws, cb1);
-
- // undo scaling, round, convert to byte
- uint8x8x4_t o;
- o.val[0] = vqrshrun_n_s16(rws, 4);
- o.val[1] = vqrshrun_n_s16(gws, 4);
- o.val[2] = vqrshrun_n_s16(bws, 4);
- o.val[3] = vdup_n_u8(255);
-
- // store, interleaving r/g/b/a
- vst4_u8(out, o);
- out += 8*4;
- }
- }
+ // in this version, step=3 support would be easy to add. but is there
+ // demand?
+ if (step == 4) {
+ // this is a fairly straightforward implementation and not
+ // super-optimized.
+ uint8x8_t signflip = vdup_n_u8(0x80);
+ int16x8_t cr_const0 = vdupq_n_s16((short)(1.40200f * 4096.0f + 0.5f));
+ int16x8_t cr_const1 = vdupq_n_s16(-(short)(0.71414f * 4096.0f + 0.5f));
+ int16x8_t cb_const0 = vdupq_n_s16(-(short)(0.34414f * 4096.0f + 0.5f));
+ int16x8_t cb_const1 = vdupq_n_s16((short)(1.77200f * 4096.0f + 0.5f));
+
+ for (; i + 7 < count; i += 8) {
+ // load
+ uint8x8_t y_bytes = vld1_u8(y + i);
+ uint8x8_t cr_bytes = vld1_u8(pcr + i);
+ uint8x8_t cb_bytes = vld1_u8(pcb + i);
+ int8x8_t cr_biased =
+ vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip));
+ int8x8_t cb_biased =
+ vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip));
+
+ // expand to s16
+ int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4));
+ int16x8_t crw = vshll_n_s8(cr_biased, 7);
+ int16x8_t cbw = vshll_n_s8(cb_biased, 7);
+
+ // color transform
+ int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0);
+ int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0);
+ int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1);
+ int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1);
+ int16x8_t rws = vaddq_s16(yws, cr0);
+ int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1);
+ int16x8_t bws = vaddq_s16(yws, cb1);
+
+ // undo scaling, round, convert to byte
+ uint8x8x4_t o;
+ o.val[0] = vqrshrun_n_s16(rws, 4);
+ o.val[1] = vqrshrun_n_s16(gws, 4);
+ o.val[2] = vqrshrun_n_s16(bws, 4);
+ o.val[3] = vdup_n_u8(255);
+
+ // store, interleaving r/g/b/a
+ vst4_u8(out, o);
+ out += 8 * 4;
+ }
+ }
#endif
- for (; i < count; ++i) {
- int y_fixed = (y[i] << 20) + (1<<19); // rounding
- int r,g,b;
- int cr = pcr[i] - 128;
- int cb = pcb[i] - 128;
- r = y_fixed + cr* stbi__float2fixed(1.40200f);
- g = y_fixed + cr*-stbi__float2fixed(0.71414f) + ((cb*-stbi__float2fixed(0.34414f)) & 0xffff0000);
- b = y_fixed + cb* stbi__float2fixed(1.77200f);
- r >>= 20;
- g >>= 20;
- b >>= 20;
- if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
- if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
- if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
- out[0] = (stbi_uc)r;
- out[1] = (stbi_uc)g;
- out[2] = (stbi_uc)b;
- out[3] = 255;
- out += step;
- }
+ for (; i < count; ++i) {
+ int y_fixed = (y[i] << 20) + (1 << 19); // rounding
+ int r, g, b;
+ int cr = pcr[i] - 128;
+ int cb = pcb[i] - 128;
+ r = y_fixed + cr * stbi__float2fixed(1.40200f);
+ g = y_fixed + cr * -stbi__float2fixed(0.71414f) +
+ ((cb * -stbi__float2fixed(0.34414f)) & 0xffff0000);
+ b = y_fixed + cb * stbi__float2fixed(1.77200f);
+ r >>= 20;
+ g >>= 20;
+ b >>= 20;
+ if ((unsigned)r > 255) {
+ if (r < 0)
+ r = 0;
+ else
+ r = 255;
+ }
+ if ((unsigned)g > 255) {
+ if (g < 0)
+ g = 0;
+ else
+ g = 255;
+ }
+ if ((unsigned)b > 255) {
+ if (b < 0)
+ b = 0;
+ else
+ b = 255;
+ }
+ out[0] = (stbi_uc)r;
+ out[1] = (stbi_uc)g;
+ out[2] = (stbi_uc)b;
+ out[3] = 255;
+ out += step;
+ }
}
#endif
// set up the kernels
static void stbi__setup_jpeg(stbi__jpeg *j)
{
- j->idct_block_kernel = stbi__idct_block;
- j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row;
- j->resample_row_hv_2_kernel = stbi__resample_row_hv_2;
+ j->idct_block_kernel = stbi__idct_block;
+ j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row;
+ j->resample_row_hv_2_kernel = stbi__resample_row_hv_2;
#ifdef STBI_SSE2
- if (stbi__sse2_available()) {
- j->idct_block_kernel = stbi__idct_simd;
- j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
- j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
- }
+ if (stbi__sse2_available()) {
+ j->idct_block_kernel = stbi__idct_simd;
+ j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+ j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+ }
#endif
#ifdef STBI_NEON
- j->idct_block_kernel = stbi__idct_simd;
- j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
- j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+ j->idct_block_kernel = stbi__idct_simd;
+ j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+ j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
#endif
}
// clean up the temporary component buffers
static void stbi__cleanup_jpeg(stbi__jpeg *j)
{
- stbi__free_jpeg_components(j, j->s->img_n, 0);
+ stbi__free_jpeg_components(j, j->s->img_n, 0);
}
-typedef struct
-{
- resample_row_func resample;
- stbi_uc *line0,*line1;
- int hs,vs; // expansion factor in each axis
- int w_lores; // horizontal pixels pre-expansion
- int ystep; // how far through vertical expansion we are
- int ypos; // which pre-expansion row we're on
+typedef struct {
+ resample_row_func resample;
+ stbi_uc *line0, *line1;
+ int hs, vs; // expansion factor in each axis
+ int w_lores; // horizontal pixels pre-expansion
+ int ystep; // how far through vertical expansion we are
+ int ypos; // which pre-expansion row we're on
} stbi__resample;
// fast 0..255 * 0..255 => 0..255 rounded multiplication
static stbi_uc stbi__blinn_8x8(stbi_uc x, stbi_uc y)
{
- unsigned int t = x*y + 128;
- return (stbi_uc) ((t + (t >>8)) >> 8);
+ unsigned int t = x * y + 128;
+ return (stbi_uc)((t + (t >> 8)) >> 8);
}
-static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp)
+static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y,
+ int *comp, int req_comp)
{
- int n, decode_n, is_rgb;
- z->s->img_n = 0; // make stbi__cleanup_jpeg safe
-
- // validate req_comp
- if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
+ int n, decode_n, is_rgb;
+ z->s->img_n = 0; // make stbi__cleanup_jpeg safe
- // load a jpeg image from whichever source, but leave in YCbCr format
- if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; }
+ // validate req_comp
+ if (req_comp < 0 || req_comp > 4)
+ return stbi__errpuc("bad req_comp", "Internal error");
- // determine actual number of components to generate
- n = req_comp ? req_comp : z->s->img_n >= 3 ? 3 : 1;
+ // load a jpeg image from whichever source, but leave in YCbCr format
+ if (!stbi__decode_jpeg_image(z)) {
+ stbi__cleanup_jpeg(z);
+ return NULL;
+ }
- is_rgb = z->s->img_n == 3 && (z->rgb == 3 || (z->app14_color_transform == 0 && !z->jfif));
+ // determine actual number of components to generate
+ n = req_comp ? req_comp : z->s->img_n >= 3 ? 3 : 1;
- if (z->s->img_n == 3 && n < 3 && !is_rgb)
- decode_n = 1;
- else
- decode_n = z->s->img_n;
+ is_rgb = z->s->img_n == 3 &&
+ (z->rgb == 3 || (z->app14_color_transform == 0 && !z->jfif));
- // resample and color-convert
- {
- int k;
- unsigned int i,j;
- stbi_uc *output;
- stbi_uc *coutput[4];
+ if (z->s->img_n == 3 && n < 3 && !is_rgb)
+ decode_n = 1;
+ else
+ decode_n = z->s->img_n;
- stbi__resample res_comp[4];
+ // resample and color-convert
+ {
+ int k;
+ unsigned int i, j;
+ stbi_uc *output;
+ stbi_uc *coutput[4];
- for (k=0; k < decode_n; ++k) {
- stbi__resample *r = &res_comp[k];
+ stbi__resample res_comp[4];
- // allocate line buffer big enough for upsampling off the edges
- // with upsample factor of 4
- z->img_comp[k].linebuf = (stbi_uc *) stbi__malloc(z->s->img_x + 3);
- if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
+ for (k = 0; k < decode_n; ++k) {
+ stbi__resample *r = &res_comp[k];
- r->hs = z->img_h_max / z->img_comp[k].h;
- r->vs = z->img_v_max / z->img_comp[k].v;
- r->ystep = r->vs >> 1;
- r->w_lores = (z->s->img_x + r->hs-1) / r->hs;
- r->ypos = 0;
- r->line0 = r->line1 = z->img_comp[k].data;
+ // allocate line buffer big enough for upsampling off the edges
+ // with upsample factor of 4
+ z->img_comp[k].linebuf = (stbi_uc *)stbi__malloc(z->s->img_x + 3);
+ if (!z->img_comp[k].linebuf) {
+ stbi__cleanup_jpeg(z);
+ return stbi__errpuc("outofmem", "Out of memory");
+ }
- if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1;
- else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2;
- else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2;
- else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel;
- else r->resample = stbi__resample_row_generic;
- }
+ r->hs = z->img_h_max / z->img_comp[k].h;
+ r->vs = z->img_v_max / z->img_comp[k].v;
+ r->ystep = r->vs >> 1;
+ r->w_lores = (z->s->img_x + r->hs - 1) / r->hs;
+ r->ypos = 0;
+ r->line0 = r->line1 = z->img_comp[k].data;
+
+ if (r->hs == 1 && r->vs == 1)
+ r->resample = resample_row_1;
+ else if (r->hs == 1 && r->vs == 2)
+ r->resample = stbi__resample_row_v_2;
+ else if (r->hs == 2 && r->vs == 1)
+ r->resample = stbi__resample_row_h_2;
+ else if (r->hs == 2 && r->vs == 2)
+ r->resample = z->resample_row_hv_2_kernel;
+ else
+ r->resample = stbi__resample_row_generic;
+ }
- // can't error after this so, this is safe
- output = (stbi_uc *) stbi__malloc_mad3(n, z->s->img_x, z->s->img_y, 1);
- if (!output) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
+ // can't error after this so, this is safe
+ output = (stbi_uc *)stbi__malloc_mad3(n, z->s->img_x, z->s->img_y, 1);
+ if (!output) {
+ stbi__cleanup_jpeg(z);
+ return stbi__errpuc("outofmem", "Out of memory");
+ }
- // now go ahead and resample
- for (j=0; j < z->s->img_y; ++j) {
- stbi_uc *out = output + n * z->s->img_x * j;
- for (k=0; k < decode_n; ++k) {
- stbi__resample *r = &res_comp[k];
- int y_bot = r->ystep >= (r->vs >> 1);
- coutput[k] = r->resample(z->img_comp[k].linebuf,
- y_bot ? r->line1 : r->line0,
- y_bot ? r->line0 : r->line1,
- r->w_lores, r->hs);
- if (++r->ystep >= r->vs) {
- r->ystep = 0;
- r->line0 = r->line1;
- if (++r->ypos < z->img_comp[k].y)
- r->line1 += z->img_comp[k].w2;
+ // now go ahead and resample
+ for (j = 0; j < z->s->img_y; ++j) {
+ stbi_uc *out = output + n * z->s->img_x * j;
+ for (k = 0; k < decode_n; ++k) {
+ stbi__resample *r = &res_comp[k];
+ int y_bot = r->ystep >= (r->vs >> 1);
+ coutput[k] = r->resample(
+ z->img_comp[k].linebuf, y_bot ? r->line1 : r->line0,
+ y_bot ? r->line0 : r->line1, r->w_lores, r->hs);
+ if (++r->ystep >= r->vs) {
+ r->ystep = 0;
+ r->line0 = r->line1;
+ if (++r->ypos < z->img_comp[k].y)
+ r->line1 += z->img_comp[k].w2;
+ }
}
- }
- if (n >= 3) {
- stbi_uc *y = coutput[0];
- if (z->s->img_n == 3) {
- if (is_rgb) {
- for (i=0; i < z->s->img_x; ++i) {
- out[0] = y[i];
- out[1] = coutput[1][i];
- out[2] = coutput[2][i];
- out[3] = 255;
- out += n;
- }
- } else {
- z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
- }
- } else if (z->s->img_n == 4) {
- if (z->app14_color_transform == 0) { // CMYK
- for (i=0; i < z->s->img_x; ++i) {
- stbi_uc m = coutput[3][i];
- out[0] = stbi__blinn_8x8(coutput[0][i], m);
- out[1] = stbi__blinn_8x8(coutput[1][i], m);
- out[2] = stbi__blinn_8x8(coutput[2][i], m);
- out[3] = 255;
- out += n;
- }
- } else if (z->app14_color_transform == 2) { // YCCK
- z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
- for (i=0; i < z->s->img_x; ++i) {
- stbi_uc m = coutput[3][i];
- out[0] = stbi__blinn_8x8(255 - out[0], m);
- out[1] = stbi__blinn_8x8(255 - out[1], m);
- out[2] = stbi__blinn_8x8(255 - out[2], m);
- out += n;
- }
- } else { // YCbCr + alpha? Ignore the fourth channel for now
- z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
- }
- } else
- for (i=0; i < z->s->img_x; ++i) {
- out[0] = out[1] = out[2] = y[i];
- out[3] = 255; // not used if n==3
- out += n;
- }
- } else {
- if (is_rgb) {
- if (n == 1)
- for (i=0; i < z->s->img_x; ++i)
- *out++ = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
- else {
- for (i=0; i < z->s->img_x; ++i, out += 2) {
- out[0] = stbi__compute_y(coutput[0][i], coutput[1][i], coutput[2][i]);
- out[1] = 255;
- }
- }
- } else if (z->s->img_n == 4 && z->app14_color_transform == 0) {
- for (i=0; i < z->s->img_x; ++i) {
- stbi_uc m = coutput[3][i];
- stbi_uc r = stbi__blinn_8x8(coutput[0][i], m);
- stbi_uc g = stbi__blinn_8x8(coutput[1][i], m);
- stbi_uc b = stbi__blinn_8x8(coutput[2][i], m);
- out[0] = stbi__compute_y(r, g, b);
- out[1] = 255;
- out += n;
- }
- } else if (z->s->img_n == 4 && z->app14_color_transform == 2) {
- for (i=0; i < z->s->img_x; ++i) {
- out[0] = stbi__blinn_8x8(255 - coutput[0][i], coutput[3][i]);
- out[1] = 255;
- out += n;
- }
+ if (n >= 3) {
+ stbi_uc *y = coutput[0];
+ if (z->s->img_n == 3) {
+ if (is_rgb) {
+ for (i = 0; i < z->s->img_x; ++i) {
+ out[0] = y[i];
+ out[1] = coutput[1][i];
+ out[2] = coutput[2][i];
+ out[3] = 255;
+ out += n;
+ }
+ } else {
+ z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2],
+ z->s->img_x, n);
+ }
+ } else if (z->s->img_n == 4) {
+ if (z->app14_color_transform == 0) { // CMYK
+ for (i = 0; i < z->s->img_x; ++i) {
+ stbi_uc m = coutput[3][i];
+ out[0] = stbi__blinn_8x8(coutput[0][i], m);
+ out[1] = stbi__blinn_8x8(coutput[1][i], m);
+ out[2] = stbi__blinn_8x8(coutput[2][i], m);
+ out[3] = 255;
+ out += n;
+ }
+ } else if (z->app14_color_transform == 2) { // YCCK
+ z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2],
+ z->s->img_x, n);
+ for (i = 0; i < z->s->img_x; ++i) {
+ stbi_uc m = coutput[3][i];
+ out[0] = stbi__blinn_8x8(255 - out[0], m);
+ out[1] = stbi__blinn_8x8(255 - out[1], m);
+ out[2] = stbi__blinn_8x8(255 - out[2], m);
+ out += n;
+ }
+ } else { // YCbCr + alpha? Ignore the fourth channel for
+ // now
+ z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2],
+ z->s->img_x, n);
+ }
+ } else
+ for (i = 0; i < z->s->img_x; ++i) {
+ out[0] = out[1] = out[2] = y[i];
+ out[3] = 255; // not used if n==3
+ out += n;
+ }
} else {
- stbi_uc *y = coutput[0];
- if (n == 1)
- for (i=0; i < z->s->img_x; ++i) out[i] = y[i];
- else
- for (i=0; i < z->s->img_x; ++i) *out++ = y[i], *out++ = 255;
+ if (is_rgb) {
+ if (n == 1)
+ for (i = 0; i < z->s->img_x; ++i)
+ *out++ = stbi__compute_y(
+ coutput[0][i], coutput[1][i], coutput[2][i]);
+ else {
+ for (i = 0; i < z->s->img_x; ++i, out += 2) {
+ out[0] = stbi__compute_y(
+ coutput[0][i], coutput[1][i], coutput[2][i]);
+ out[1] = 255;
+ }
+ }
+ } else if (z->s->img_n == 4 && z->app14_color_transform == 0) {
+ for (i = 0; i < z->s->img_x; ++i) {
+ stbi_uc m = coutput[3][i];
+ stbi_uc r = stbi__blinn_8x8(coutput[0][i], m);
+ stbi_uc g = stbi__blinn_8x8(coutput[1][i], m);
+ stbi_uc b = stbi__blinn_8x8(coutput[2][i], m);
+ out[0] = stbi__compute_y(r, g, b);
+ out[1] = 255;
+ out += n;
+ }
+ } else if (z->s->img_n == 4 && z->app14_color_transform == 2) {
+ for (i = 0; i < z->s->img_x; ++i) {
+ out[0] =
+ stbi__blinn_8x8(255 - coutput[0][i], coutput[3][i]);
+ out[1] = 255;
+ out += n;
+ }
+ } else {
+ stbi_uc *y = coutput[0];
+ if (n == 1)
+ for (i = 0; i < z->s->img_x; ++i)
+ out[i] = y[i];
+ else
+ for (i = 0; i < z->s->img_x; ++i)
+ *out++ = y[i], *out++ = 255;
+ }
}
- }
- }
- stbi__cleanup_jpeg(z);
- *out_x = z->s->img_x;
- *out_y = z->s->img_y;
- if (comp) *comp = z->s->img_n >= 3 ? 3 : 1; // report original components, not output
- return output;
- }
+ }
+ stbi__cleanup_jpeg(z);
+ *out_x = z->s->img_x;
+ *out_y = z->s->img_y;
+ if (comp)
+ *comp = z->s->img_n >= 3
+ ? 3
+ : 1; // report original components, not output
+ return output;
+ }
}
-static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+static void *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri)
{
- unsigned char* result;
- stbi__jpeg* j = (stbi__jpeg*) stbi__malloc(sizeof(stbi__jpeg));
- STBI_NOTUSED(ri);
- j->s = s;
- stbi__setup_jpeg(j);
- result = load_jpeg_image(j, x,y,comp,req_comp);
- STBI_FREE(j);
- return result;
+ unsigned char *result;
+ stbi__jpeg *j = (stbi__jpeg *)stbi__malloc(sizeof(stbi__jpeg));
+ STBI_NOTUSED(ri);
+ j->s = s;
+ stbi__setup_jpeg(j);
+ result = load_jpeg_image(j, x, y, comp, req_comp);
+ STBI_FREE(j);
+ return result;
}
static int stbi__jpeg_test(stbi__context *s)
{
- int r;
- stbi__jpeg* j = (stbi__jpeg*)stbi__malloc(sizeof(stbi__jpeg));
- j->s = s;
- stbi__setup_jpeg(j);
- r = stbi__decode_jpeg_header(j, STBI__SCAN_type);
- stbi__rewind(s);
- STBI_FREE(j);
- return r;
+ int r;
+ stbi__jpeg *j = (stbi__jpeg *)stbi__malloc(sizeof(stbi__jpeg));
+ j->s = s;
+ stbi__setup_jpeg(j);
+ r = stbi__decode_jpeg_header(j, STBI__SCAN_type);
+ stbi__rewind(s);
+ STBI_FREE(j);
+ return r;
}
static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp)
{
- if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) {
- stbi__rewind( j->s );
- return 0;
- }
- if (x) *x = j->s->img_x;
- if (y) *y = j->s->img_y;
- if (comp) *comp = j->s->img_n >= 3 ? 3 : 1;
- return 1;
+ if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) {
+ stbi__rewind(j->s);
+ return 0;
+ }
+ if (x)
+ *x = j->s->img_x;
+ if (y)
+ *y = j->s->img_y;
+ if (comp)
+ *comp = j->s->img_n >= 3 ? 3 : 1;
+ return 1;
}
static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp)
{
- int result;
- stbi__jpeg* j = (stbi__jpeg*) (stbi__malloc(sizeof(stbi__jpeg)));
- j->s = s;
- result = stbi__jpeg_info_raw(j, x, y, comp);
- STBI_FREE(j);
- return result;
+ int result;
+ stbi__jpeg *j = (stbi__jpeg *)(stbi__malloc(sizeof(stbi__jpeg)));
+ j->s = s;
+ result = stbi__jpeg_info_raw(j, x, y, comp);
+ STBI_FREE(j);
+ return result;
}
#endif
-// public domain zlib decode v0.2 Sean Barrett 2006-11-18
-// simple implementation
-// - all input must be provided in an upfront buffer
-// - all output is written to a single output buffer (can malloc/realloc)
-// performance
-// - fast huffman
+ // public domain zlib decode v0.2 Sean Barrett 2006-11-18
+ // simple implementation
+ // - all input must be provided in an upfront buffer
+ // - all output is written to a single output buffer (can
+ // malloc/realloc)
+ // performance
+ // - fast huffman
#ifndef STBI_NO_ZLIB
// fast-way is faster to check than jpeg huffman, but slow way is slower
-#define STBI__ZFAST_BITS 9 // accelerate all cases in default tables
-#define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1)
+#define STBI__ZFAST_BITS 9 // accelerate all cases in default tables
+#define STBI__ZFAST_MASK ((1 << STBI__ZFAST_BITS) - 1)
// zlib-style huffman encoding
// (jpegs packs from left, zlib from right, so can't share code)
-typedef struct
-{
- stbi__uint16 fast[1 << STBI__ZFAST_BITS];
- stbi__uint16 firstcode[16];
- int maxcode[17];
- stbi__uint16 firstsymbol[16];
- stbi_uc size[288];
- stbi__uint16 value[288];
+typedef struct {
+ stbi__uint16 fast[1 << STBI__ZFAST_BITS];
+ stbi__uint16 firstcode[16];
+ int maxcode[17];
+ stbi__uint16 firstsymbol[16];
+ stbi_uc size[288];
+ stbi__uint16 value[288];
} stbi__zhuffman;
stbi_inline static int stbi__bitreverse16(int n)
{
- n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1);
- n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2);
- n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4);
- n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8);
- return n;
+ n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1);
+ n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2);
+ n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4);
+ n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8);
+ return n;
}
stbi_inline static int stbi__bit_reverse(int v, int bits)
{
- STBI_ASSERT(bits <= 16);
- // to bit reverse n bits, reverse 16 and shift
- // e.g. 11 bits, bit reverse and shift away 5
- return stbi__bitreverse16(v) >> (16-bits);
-}
-
-static int stbi__zbuild_huffman(stbi__zhuffman *z, const stbi_uc *sizelist, int num)
-{
- int i,k=0;
- int code, next_code[16], sizes[17];
-
- // DEFLATE spec for generating codes
- memset(sizes, 0, sizeof(sizes));
- memset(z->fast, 0, sizeof(z->fast));
- for (i=0; i < num; ++i)
- ++sizes[sizelist[i]];
- sizes[0] = 0;
- for (i=1; i < 16; ++i)
- if (sizes[i] > (1 << i))
- return stbi__err("bad sizes", "Corrupt PNG");
- code = 0;
- for (i=1; i < 16; ++i) {
- next_code[i] = code;
- z->firstcode[i] = (stbi__uint16) code;
- z->firstsymbol[i] = (stbi__uint16) k;
- code = (code + sizes[i]);
- if (sizes[i])
- if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG");
- z->maxcode[i] = code << (16-i); // preshift for inner loop
- code <<= 1;
- k += sizes[i];
- }
- z->maxcode[16] = 0x10000; // sentinel
- for (i=0; i < num; ++i) {
- int s = sizelist[i];
- if (s) {
- int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
- stbi__uint16 fastv = (stbi__uint16) ((s << 9) | i);
- z->size [c] = (stbi_uc ) s;
- z->value[c] = (stbi__uint16) i;
- if (s <= STBI__ZFAST_BITS) {
- int j = stbi__bit_reverse(next_code[s],s);
- while (j < (1 << STBI__ZFAST_BITS)) {
- z->fast[j] = fastv;
- j += (1 << s);
+ STBI_ASSERT(bits <= 16);
+ // to bit reverse n bits, reverse 16 and shift
+ // e.g. 11 bits, bit reverse and shift away 5
+ return stbi__bitreverse16(v) >> (16 - bits);
+}
+
+static int stbi__zbuild_huffman(stbi__zhuffman *z, const stbi_uc *sizelist,
+ int num)
+{
+ int i, k = 0;
+ int code, next_code[16], sizes[17];
+
+ // DEFLATE spec for generating codes
+ memset(sizes, 0, sizeof(sizes));
+ memset(z->fast, 0, sizeof(z->fast));
+ for (i = 0; i < num; ++i)
+ ++sizes[sizelist[i]];
+ sizes[0] = 0;
+ for (i = 1; i < 16; ++i)
+ if (sizes[i] > (1 << i))
+ return stbi__err("bad sizes", "Corrupt PNG");
+ code = 0;
+ for (i = 1; i < 16; ++i) {
+ next_code[i] = code;
+ z->firstcode[i] = (stbi__uint16)code;
+ z->firstsymbol[i] = (stbi__uint16)k;
+ code = (code + sizes[i]);
+ if (sizes[i])
+ if (code - 1 >= (1 << i))
+ return stbi__err("bad codelengths", "Corrupt PNG");
+ z->maxcode[i] = code << (16 - i); // preshift for inner loop
+ code <<= 1;
+ k += sizes[i];
+ }
+ z->maxcode[16] = 0x10000; // sentinel
+ for (i = 0; i < num; ++i) {
+ int s = sizelist[i];
+ if (s) {
+ int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
+ stbi__uint16 fastv = (stbi__uint16)((s << 9) | i);
+ z->size[c] = (stbi_uc)s;
+ z->value[c] = (stbi__uint16)i;
+ if (s <= STBI__ZFAST_BITS) {
+ int j = stbi__bit_reverse(next_code[s], s);
+ while (j < (1 << STBI__ZFAST_BITS)) {
+ z->fast[j] = fastv;
+ j += (1 << s);
+ }
}
- }
- ++next_code[s];
- }
- }
- return 1;
+ ++next_code[s];
+ }
+ }
+ return 1;
}
// zlib-from-memory implementation for PNG reading
@@ -3822,259 +4356,301 @@ static int stbi__zbuild_huffman(stbi__zhuffman *z, const stbi_uc *sizelist, int
// we require PNG read all the IDATs and combine them into a single
// memory buffer
-typedef struct
-{
- stbi_uc *zbuffer, *zbuffer_end;
- int num_bits;
- stbi__uint32 code_buffer;
+typedef struct {
+ stbi_uc *zbuffer, *zbuffer_end;
+ int num_bits;
+ stbi__uint32 code_buffer;
- char *zout;
- char *zout_start;
- char *zout_end;
- int z_expandable;
+ char *zout;
+ char *zout_start;
+ char *zout_end;
+ int z_expandable;
- stbi__zhuffman z_length, z_distance;
+ stbi__zhuffman z_length, z_distance;
} stbi__zbuf;
stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z)
{
- if (z->zbuffer >= z->zbuffer_end) return 0;
- return *z->zbuffer++;
+ if (z->zbuffer >= z->zbuffer_end)
+ return 0;
+ return *z->zbuffer++;
}
static void stbi__fill_bits(stbi__zbuf *z)
{
- do {
- STBI_ASSERT(z->code_buffer < (1U << z->num_bits));
- z->code_buffer |= (unsigned int) stbi__zget8(z) << z->num_bits;
- z->num_bits += 8;
- } while (z->num_bits <= 24);
+ do {
+ STBI_ASSERT(z->code_buffer < (1U << z->num_bits));
+ z->code_buffer |= (unsigned int)stbi__zget8(z) << z->num_bits;
+ z->num_bits += 8;
+ } while (z->num_bits <= 24);
}
stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n)
{
- unsigned int k;
- if (z->num_bits < n) stbi__fill_bits(z);
- k = z->code_buffer & ((1 << n) - 1);
- z->code_buffer >>= n;
- z->num_bits -= n;
- return k;
+ unsigned int k;
+ if (z->num_bits < n)
+ stbi__fill_bits(z);
+ k = z->code_buffer & ((1 << n) - 1);
+ z->code_buffer >>= n;
+ z->num_bits -= n;
+ return k;
}
static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z)
{
- int b,s,k;
- // not resolved by fast table, so compute it the slow way
- // use jpeg approach, which requires MSbits at top
- k = stbi__bit_reverse(a->code_buffer, 16);
- for (s=STBI__ZFAST_BITS+1; ; ++s)
- if (k < z->maxcode[s])
- break;
- if (s == 16) return -1; // invalid code!
- // code size is s, so:
- b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s];
- STBI_ASSERT(z->size[b] == s);
- a->code_buffer >>= s;
- a->num_bits -= s;
- return z->value[b];
+ int b, s, k;
+ // not resolved by fast table, so compute it the slow way
+ // use jpeg approach, which requires MSbits at top
+ k = stbi__bit_reverse(a->code_buffer, 16);
+ for (s = STBI__ZFAST_BITS + 1;; ++s)
+ if (k < z->maxcode[s])
+ break;
+ if (s == 16)
+ return -1; // invalid code!
+ // code size is s, so:
+ b = (k >> (16 - s)) - z->firstcode[s] + z->firstsymbol[s];
+ STBI_ASSERT(z->size[b] == s);
+ a->code_buffer >>= s;
+ a->num_bits -= s;
+ return z->value[b];
}
stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z)
{
- int b,s;
- if (a->num_bits < 16) stbi__fill_bits(a);
- b = z->fast[a->code_buffer & STBI__ZFAST_MASK];
- if (b) {
- s = b >> 9;
- a->code_buffer >>= s;
- a->num_bits -= s;
- return b & 511;
- }
- return stbi__zhuffman_decode_slowpath(a, z);
-}
-
-static int stbi__zexpand(stbi__zbuf *z, char *zout, int n) // need to make room for n bytes
-{
- char *q;
- int cur, limit, old_limit;
- z->zout = zout;
- if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG");
- cur = (int) (z->zout - z->zout_start);
- limit = old_limit = (int) (z->zout_end - z->zout_start);
- while (cur + n > limit)
- limit *= 2;
- q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit);
- STBI_NOTUSED(old_limit);
- if (q == NULL) return stbi__err("outofmem", "Out of memory");
- z->zout_start = q;
- z->zout = q + cur;
- z->zout_end = q + limit;
- return 1;
+ int b, s;
+ if (a->num_bits < 16)
+ stbi__fill_bits(a);
+ b = z->fast[a->code_buffer & STBI__ZFAST_MASK];
+ if (b) {
+ s = b >> 9;
+ a->code_buffer >>= s;
+ a->num_bits -= s;
+ return b & 511;
+ }
+ return stbi__zhuffman_decode_slowpath(a, z);
+}
+
+static int stbi__zexpand(stbi__zbuf *z, char *zout,
+ int n) // need to make room for n bytes
+{
+ char *q;
+ int cur, limit, old_limit;
+ z->zout = zout;
+ if (!z->z_expandable)
+ return stbi__err("output buffer limit", "Corrupt PNG");
+ cur = (int)(z->zout - z->zout_start);
+ limit = old_limit = (int)(z->zout_end - z->zout_start);
+ while (cur + n > limit)
+ limit *= 2;
+ q = (char *)STBI_REALLOC_SIZED(z->zout_start, old_limit, limit);
+ STBI_NOTUSED(old_limit);
+ if (q == NULL)
+ return stbi__err("outofmem", "Out of memory");
+ z->zout_start = q;
+ z->zout = q + cur;
+ z->zout_end = q + limit;
+ return 1;
}
static int stbi__zlength_base[31] = {
- 3,4,5,6,7,8,9,10,11,13,
- 15,17,19,23,27,31,35,43,51,59,
- 67,83,99,115,131,163,195,227,258,0,0 };
+ 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
+ 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
-static int stbi__zlength_extra[31]=
-{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 };
+static int stbi__zlength_extra[31] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
+ 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4,
+ 4, 4, 5, 5, 5, 5, 0, 0, 0};
-static int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,
-257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0};
+static int stbi__zdist_base[32] = {
+ 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33,
+ 49, 65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537,
+ 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577, 0, 0};
-static int stbi__zdist_extra[32] =
-{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
+static int stbi__zdist_extra[32] = {0, 0, 0, 0, 1, 1, 2, 2, 3, 3,
+ 4, 4, 5, 5, 6, 6, 7, 7, 8, 8,
+ 9, 9, 10, 10, 11, 11, 12, 12, 13, 13};
static int stbi__parse_huffman_block(stbi__zbuf *a)
{
- char *zout = a->zout;
- for(;;) {
- int z = stbi__zhuffman_decode(a, &a->z_length);
- if (z < 256) {
- if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes
- if (zout >= a->zout_end) {
- if (!stbi__zexpand(a, zout, 1)) return 0;
- zout = a->zout;
- }
- *zout++ = (char) z;
- } else {
- stbi_uc *p;
- int len,dist;
- if (z == 256) {
- a->zout = zout;
- return 1;
- }
- z -= 257;
- len = stbi__zlength_base[z];
- if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]);
- z = stbi__zhuffman_decode(a, &a->z_distance);
- if (z < 0) return stbi__err("bad huffman code","Corrupt PNG");
- dist = stbi__zdist_base[z];
- if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]);
- if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG");
- if (zout + len > a->zout_end) {
- if (!stbi__zexpand(a, zout, len)) return 0;
- zout = a->zout;
- }
- p = (stbi_uc *) (zout - dist);
- if (dist == 1) { // run of one byte; common in images.
- stbi_uc v = *p;
- if (len) { do *zout++ = v; while (--len); }
- } else {
- if (len) { do *zout++ = *p++; while (--len); }
- }
- }
- }
+ char *zout = a->zout;
+ for (;;) {
+ int z = stbi__zhuffman_decode(a, &a->z_length);
+ if (z < 256) {
+ if (z < 0)
+ return stbi__err("bad huffman code",
+ "Corrupt PNG"); // error in huffman codes
+ if (zout >= a->zout_end) {
+ if (!stbi__zexpand(a, zout, 1))
+ return 0;
+ zout = a->zout;
+ }
+ *zout++ = (char)z;
+ } else {
+ stbi_uc *p;
+ int len, dist;
+ if (z == 256) {
+ a->zout = zout;
+ return 1;
+ }
+ z -= 257;
+ len = stbi__zlength_base[z];
+ if (stbi__zlength_extra[z])
+ len += stbi__zreceive(a, stbi__zlength_extra[z]);
+ z = stbi__zhuffman_decode(a, &a->z_distance);
+ if (z < 0)
+ return stbi__err("bad huffman code", "Corrupt PNG");
+ dist = stbi__zdist_base[z];
+ if (stbi__zdist_extra[z])
+ dist += stbi__zreceive(a, stbi__zdist_extra[z]);
+ if (zout - a->zout_start < dist)
+ return stbi__err("bad dist", "Corrupt PNG");
+ if (zout + len > a->zout_end) {
+ if (!stbi__zexpand(a, zout, len))
+ return 0;
+ zout = a->zout;
+ }
+ p = (stbi_uc *)(zout - dist);
+ if (dist == 1) { // run of one byte; common in images.
+ stbi_uc v = *p;
+ if (len) {
+ do
+ *zout++ = v;
+ while (--len);
+ }
+ } else {
+ if (len) {
+ do
+ *zout++ = *p++;
+ while (--len);
+ }
+ }
+ }
+ }
}
static int stbi__compute_huffman_codes(stbi__zbuf *a)
{
- static stbi_uc length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
- stbi__zhuffman z_codelength;
- stbi_uc lencodes[286+32+137];//padding for maximum single op
- stbi_uc codelength_sizes[19];
- int i,n;
-
- int hlit = stbi__zreceive(a,5) + 257;
- int hdist = stbi__zreceive(a,5) + 1;
- int hclen = stbi__zreceive(a,4) + 4;
- int ntot = hlit + hdist;
-
- memset(codelength_sizes, 0, sizeof(codelength_sizes));
- for (i=0; i < hclen; ++i) {
- int s = stbi__zreceive(a,3);
- codelength_sizes[length_dezigzag[i]] = (stbi_uc) s;
- }
- if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0;
-
- n = 0;
- while (n < ntot) {
- int c = stbi__zhuffman_decode(a, &z_codelength);
- if (c < 0 || c >= 19) return stbi__err("bad codelengths", "Corrupt PNG");
- if (c < 16)
- lencodes[n++] = (stbi_uc) c;
- else {
- stbi_uc fill = 0;
- if (c == 16) {
- c = stbi__zreceive(a,2)+3;
- if (n == 0) return stbi__err("bad codelengths", "Corrupt PNG");
- fill = lencodes[n-1];
- } else if (c == 17)
- c = stbi__zreceive(a,3)+3;
- else {
- STBI_ASSERT(c == 18);
- c = stbi__zreceive(a,7)+11;
- }
- if (ntot - n < c) return stbi__err("bad codelengths", "Corrupt PNG");
- memset(lencodes+n, fill, c);
- n += c;
- }
- }
- if (n != ntot) return stbi__err("bad codelengths","Corrupt PNG");
- if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0;
- if (!stbi__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0;
- return 1;
+ static stbi_uc length_dezigzag[19] = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5,
+ 11, 4, 12, 3, 13, 2, 14, 1, 15};
+ stbi__zhuffman z_codelength;
+ stbi_uc lencodes[286 + 32 + 137]; // padding for maximum single op
+ stbi_uc codelength_sizes[19];
+ int i, n;
+
+ int hlit = stbi__zreceive(a, 5) + 257;
+ int hdist = stbi__zreceive(a, 5) + 1;
+ int hclen = stbi__zreceive(a, 4) + 4;
+ int ntot = hlit + hdist;
+
+ memset(codelength_sizes, 0, sizeof(codelength_sizes));
+ for (i = 0; i < hclen; ++i) {
+ int s = stbi__zreceive(a, 3);
+ codelength_sizes[length_dezigzag[i]] = (stbi_uc)s;
+ }
+ if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19))
+ return 0;
+
+ n = 0;
+ while (n < ntot) {
+ int c = stbi__zhuffman_decode(a, &z_codelength);
+ if (c < 0 || c >= 19)
+ return stbi__err("bad codelengths", "Corrupt PNG");
+ if (c < 16)
+ lencodes[n++] = (stbi_uc)c;
+ else {
+ stbi_uc fill = 0;
+ if (c == 16) {
+ c = stbi__zreceive(a, 2) + 3;
+ if (n == 0)
+ return stbi__err("bad codelengths", "Corrupt PNG");
+ fill = lencodes[n - 1];
+ } else if (c == 17)
+ c = stbi__zreceive(a, 3) + 3;
+ else {
+ STBI_ASSERT(c == 18);
+ c = stbi__zreceive(a, 7) + 11;
+ }
+ if (ntot - n < c)
+ return stbi__err("bad codelengths", "Corrupt PNG");
+ memset(lencodes + n, fill, c);
+ n += c;
+ }
+ }
+ if (n != ntot)
+ return stbi__err("bad codelengths", "Corrupt PNG");
+ if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit))
+ return 0;
+ if (!stbi__zbuild_huffman(&a->z_distance, lencodes + hlit, hdist))
+ return 0;
+ return 1;
}
static int stbi__parse_uncompressed_block(stbi__zbuf *a)
{
- stbi_uc header[4];
- int len,nlen,k;
- if (a->num_bits & 7)
- stbi__zreceive(a, a->num_bits & 7); // discard
- // drain the bit-packed data into header
- k = 0;
- while (a->num_bits > 0) {
- header[k++] = (stbi_uc) (a->code_buffer & 255); // suppress MSVC run-time check
- a->code_buffer >>= 8;
- a->num_bits -= 8;
- }
- STBI_ASSERT(a->num_bits == 0);
- // now fill header the normal way
- while (k < 4)
- header[k++] = stbi__zget8(a);
- len = header[1] * 256 + header[0];
- nlen = header[3] * 256 + header[2];
- if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt","Corrupt PNG");
- if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer","Corrupt PNG");
- if (a->zout + len > a->zout_end)
- if (!stbi__zexpand(a, a->zout, len)) return 0;
- memcpy(a->zout, a->zbuffer, len);
- a->zbuffer += len;
- a->zout += len;
- return 1;
+ stbi_uc header[4];
+ int len, nlen, k;
+ if (a->num_bits & 7)
+ stbi__zreceive(a, a->num_bits & 7); // discard
+ // drain the bit-packed data into header
+ k = 0;
+ while (a->num_bits > 0) {
+ header[k++] =
+ (stbi_uc)(a->code_buffer & 255); // suppress MSVC run-time check
+ a->code_buffer >>= 8;
+ a->num_bits -= 8;
+ }
+ STBI_ASSERT(a->num_bits == 0);
+ // now fill header the normal way
+ while (k < 4)
+ header[k++] = stbi__zget8(a);
+ len = header[1] * 256 + header[0];
+ nlen = header[3] * 256 + header[2];
+ if (nlen != (len ^ 0xffff))
+ return stbi__err("zlib corrupt", "Corrupt PNG");
+ if (a->zbuffer + len > a->zbuffer_end)
+ return stbi__err("read past buffer", "Corrupt PNG");
+ if (a->zout + len > a->zout_end)
+ if (!stbi__zexpand(a, a->zout, len))
+ return 0;
+ memcpy(a->zout, a->zbuffer, len);
+ a->zbuffer += len;
+ a->zout += len;
+ return 1;
}
static int stbi__parse_zlib_header(stbi__zbuf *a)
{
- int cmf = stbi__zget8(a);
- int cm = cmf & 15;
- /* int cinfo = cmf >> 4; */
- int flg = stbi__zget8(a);
- if ((cmf*256+flg) % 31 != 0) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec
- if (flg & 32) return stbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png
- if (cm != 8) return stbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png
- // window = 1 << (8 + cinfo)... but who cares, we fully buffer output
- return 1;
-}
-
-static const stbi_uc stbi__zdefault_length[288] =
-{
- 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
- 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
- 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
- 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
- 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
- 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
- 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
- 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
- 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8
-};
-static const stbi_uc stbi__zdefault_distance[32] =
-{
- 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5
-};
+ int cmf = stbi__zget8(a);
+ int cm = cmf & 15;
+ /* int cinfo = cmf >> 4; */
+ int flg = stbi__zget8(a);
+ if ((cmf * 256 + flg) % 31 != 0)
+ return stbi__err("bad zlib header", "Corrupt PNG"); // zlib spec
+ if (flg & 32)
+ return stbi__err("no preset dict",
+ "Corrupt PNG"); // preset dictionary not allowed in png
+ if (cm != 8)
+ return stbi__err("bad compression",
+ "Corrupt PNG"); // DEFLATE required for png
+ // window = 1 << (8 + cinfo)... but who cares, we fully buffer output
+ return 1;
+}
+
+static const stbi_uc stbi__zdefault_length[288] = {
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
+ 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8};
+static const stbi_uc stbi__zdefault_distance[32] = {
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
+ 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5};
/*
Init algorithm:
{
@@ -4090,1142 +4666,1423 @@ Init algorithm:
static int stbi__parse_zlib(stbi__zbuf *a, int parse_header)
{
- int final, type;
- if (parse_header)
- if (!stbi__parse_zlib_header(a)) return 0;
- a->num_bits = 0;
- a->code_buffer = 0;
- do {
- final = stbi__zreceive(a,1);
- type = stbi__zreceive(a,2);
- if (type == 0) {
- if (!stbi__parse_uncompressed_block(a)) return 0;
- } else if (type == 3) {
- return 0;
- } else {
- if (type == 1) {
- // use fixed code lengths
- if (!stbi__zbuild_huffman(&a->z_length , stbi__zdefault_length , 288)) return 0;
- if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance, 32)) return 0;
- } else {
- if (!stbi__compute_huffman_codes(a)) return 0;
- }
- if (!stbi__parse_huffman_block(a)) return 0;
- }
- } while (!final);
- return 1;
-}
-
-static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header)
-{
- a->zout_start = obuf;
- a->zout = obuf;
- a->zout_end = obuf + olen;
- a->z_expandable = exp;
-
- return stbi__parse_zlib(a, parse_header);
-}
-
-STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen)
-{
- stbi__zbuf a;
- char *p = (char *) stbi__malloc(initial_size);
- if (p == NULL) return NULL;
- a.zbuffer = (stbi_uc *) buffer;
- a.zbuffer_end = (stbi_uc *) buffer + len;
- if (stbi__do_zlib(&a, p, initial_size, 1, 1)) {
- if (outlen) *outlen = (int) (a.zout - a.zout_start);
- return a.zout_start;
- } else {
- STBI_FREE(a.zout_start);
- return NULL;
- }
+ int final, type;
+ if (parse_header)
+ if (!stbi__parse_zlib_header(a))
+ return 0;
+ a->num_bits = 0;
+ a->code_buffer = 0;
+ do {
+ final = stbi__zreceive(a, 1);
+ type = stbi__zreceive(a, 2);
+ if (type == 0) {
+ if (!stbi__parse_uncompressed_block(a))
+ return 0;
+ } else if (type == 3) {
+ return 0;
+ } else {
+ if (type == 1) {
+ // use fixed code lengths
+ if (!stbi__zbuild_huffman(&a->z_length, stbi__zdefault_length,
+ 288))
+ return 0;
+ if (!stbi__zbuild_huffman(&a->z_distance,
+ stbi__zdefault_distance, 32))
+ return 0;
+ } else {
+ if (!stbi__compute_huffman_codes(a))
+ return 0;
+ }
+ if (!stbi__parse_huffman_block(a))
+ return 0;
+ }
+ } while (!final);
+ return 1;
+}
+
+static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp,
+ int parse_header)
+{
+ a->zout_start = obuf;
+ a->zout = obuf;
+ a->zout_end = obuf + olen;
+ a->z_expandable = exp;
+
+ return stbi__parse_zlib(a, parse_header);
}
-STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen)
+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len,
+ int initial_size, int *outlen)
{
- return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen);
+ stbi__zbuf a;
+ char *p = (char *)stbi__malloc(initial_size);
+ if (p == NULL)
+ return NULL;
+ a.zbuffer = (stbi_uc *)buffer;
+ a.zbuffer_end = (stbi_uc *)buffer + len;
+ if (stbi__do_zlib(&a, p, initial_size, 1, 1)) {
+ if (outlen)
+ *outlen = (int)(a.zout - a.zout_start);
+ return a.zout_start;
+ } else {
+ STBI_FREE(a.zout_start);
+ return NULL;
+ }
}
-STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header)
+STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen)
{
- stbi__zbuf a;
- char *p = (char *) stbi__malloc(initial_size);
- if (p == NULL) return NULL;
- a.zbuffer = (stbi_uc *) buffer;
- a.zbuffer_end = (stbi_uc *) buffer + len;
- if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) {
- if (outlen) *outlen = (int) (a.zout - a.zout_start);
- return a.zout_start;
- } else {
- STBI_FREE(a.zout_start);
- return NULL;
- }
+ return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen);
+}
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer,
+ int len,
+ int initial_size,
+ int *outlen,
+ int parse_header)
+{
+ stbi__zbuf a;
+ char *p = (char *)stbi__malloc(initial_size);
+ if (p == NULL)
+ return NULL;
+ a.zbuffer = (stbi_uc *)buffer;
+ a.zbuffer_end = (stbi_uc *)buffer + len;
+ if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) {
+ if (outlen)
+ *outlen = (int)(a.zout - a.zout_start);
+ return a.zout_start;
+ } else {
+ STBI_FREE(a.zout_start);
+ return NULL;
+ }
}
-STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen)
+STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen,
+ char const *ibuffer, int ilen)
{
- stbi__zbuf a;
- a.zbuffer = (stbi_uc *) ibuffer;
- a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
- if (stbi__do_zlib(&a, obuffer, olen, 0, 1))
- return (int) (a.zout - a.zout_start);
- else
- return -1;
+ stbi__zbuf a;
+ a.zbuffer = (stbi_uc *)ibuffer;
+ a.zbuffer_end = (stbi_uc *)ibuffer + ilen;
+ if (stbi__do_zlib(&a, obuffer, olen, 0, 1))
+ return (int)(a.zout - a.zout_start);
+ else
+ return -1;
}
-STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen)
+STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len,
+ int *outlen)
{
- stbi__zbuf a;
- char *p = (char *) stbi__malloc(16384);
- if (p == NULL) return NULL;
- a.zbuffer = (stbi_uc *) buffer;
- a.zbuffer_end = (stbi_uc *) buffer+len;
- if (stbi__do_zlib(&a, p, 16384, 1, 0)) {
- if (outlen) *outlen = (int) (a.zout - a.zout_start);
- return a.zout_start;
- } else {
- STBI_FREE(a.zout_start);
- return NULL;
- }
+ stbi__zbuf a;
+ char *p = (char *)stbi__malloc(16384);
+ if (p == NULL)
+ return NULL;
+ a.zbuffer = (stbi_uc *)buffer;
+ a.zbuffer_end = (stbi_uc *)buffer + len;
+ if (stbi__do_zlib(&a, p, 16384, 1, 0)) {
+ if (outlen)
+ *outlen = (int)(a.zout - a.zout_start);
+ return a.zout_start;
+ } else {
+ STBI_FREE(a.zout_start);
+ return NULL;
+ }
}
-STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen)
+STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen,
+ const char *ibuffer, int ilen)
{
- stbi__zbuf a;
- a.zbuffer = (stbi_uc *) ibuffer;
- a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
- if (stbi__do_zlib(&a, obuffer, olen, 0, 0))
- return (int) (a.zout - a.zout_start);
- else
- return -1;
+ stbi__zbuf a;
+ a.zbuffer = (stbi_uc *)ibuffer;
+ a.zbuffer_end = (stbi_uc *)ibuffer + ilen;
+ if (stbi__do_zlib(&a, obuffer, olen, 0, 0))
+ return (int)(a.zout - a.zout_start);
+ else
+ return -1;
}
#endif
-// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18
-// simple implementation
-// - only 8-bit samples
-// - no CRC checking
-// - allocates lots of intermediate memory
-// - avoids problem of streaming data between subsystems
-// - avoids explicit window management
-// performance
-// - uses stb_zlib, a PD zlib implementation with fast huffman decoding
+ // public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18
+ // simple implementation
+ // - only 8-bit samples
+ // - no CRC checking
+ // - allocates lots of intermediate memory
+ // - avoids problem of streaming data between subsystems
+ // - avoids explicit window management
+ // performance
+ // - uses stb_zlib, a PD zlib implementation with fast huffman decoding
#ifndef STBI_NO_PNG
-typedef struct
-{
- stbi__uint32 length;
- stbi__uint32 type;
+typedef struct {
+ stbi__uint32 length;
+ stbi__uint32 type;
} stbi__pngchunk;
static stbi__pngchunk stbi__get_chunk_header(stbi__context *s)
{
- stbi__pngchunk c;
- c.length = stbi__get32be(s);
- c.type = stbi__get32be(s);
- return c;
+ stbi__pngchunk c;
+ c.length = stbi__get32be(s);
+ c.type = stbi__get32be(s);
+ return c;
}
static int stbi__check_png_header(stbi__context *s)
{
- static stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 };
- int i;
- for (i=0; i < 8; ++i)
- if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG");
- return 1;
+ static stbi_uc png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+ int i;
+ for (i = 0; i < 8; ++i)
+ if (stbi__get8(s) != png_sig[i])
+ return stbi__err("bad png sig", "Not a PNG");
+ return 1;
}
-typedef struct
-{
- stbi__context *s;
- stbi_uc *idata, *expanded, *out;
- int depth;
+typedef struct {
+ stbi__context *s;
+ stbi_uc *idata, *expanded, *out;
+ int depth;
} stbi__png;
-
enum {
- STBI__F_none=0,
- STBI__F_sub=1,
- STBI__F_up=2,
- STBI__F_avg=3,
- STBI__F_paeth=4,
- // synthetic filters used for first scanline to avoid needing a dummy row of 0s
- STBI__F_avg_first,
- STBI__F_paeth_first
+ STBI__F_none = 0,
+ STBI__F_sub = 1,
+ STBI__F_up = 2,
+ STBI__F_avg = 3,
+ STBI__F_paeth = 4,
+ // synthetic filters used for first scanline to avoid needing a dummy row of
+ // 0s
+ STBI__F_avg_first,
+ STBI__F_paeth_first
};
-static stbi_uc first_row_filter[5] =
-{
- STBI__F_none,
- STBI__F_sub,
- STBI__F_none,
- STBI__F_avg_first,
- STBI__F_paeth_first
-};
+static stbi_uc first_row_filter[5] = {STBI__F_none, STBI__F_sub, STBI__F_none,
+ STBI__F_avg_first, STBI__F_paeth_first};
static int stbi__paeth(int a, int b, int c)
{
- int p = a + b - c;
- int pa = abs(p-a);
- int pb = abs(p-b);
- int pc = abs(p-c);
- if (pa <= pb && pa <= pc) return a;
- if (pb <= pc) return b;
- return c;
+ int p = a + b - c;
+ int pa = abs(p - a);
+ int pb = abs(p - b);
+ int pc = abs(p - c);
+ if (pa <= pb && pa <= pc)
+ return a;
+ if (pb <= pc)
+ return b;
+ return c;
}
-static stbi_uc stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 };
+static stbi_uc stbi__depth_scale_table[9] = {0, 0xff, 0x55, 0, 0x11,
+ 0, 0, 0, 0x01};
// create the png data from post-deflated data
-static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n, stbi__uint32 x, stbi__uint32 y, int depth, int color)
-{
- int bytes = (depth == 16? 2 : 1);
- stbi__context *s = a->s;
- stbi__uint32 i,j,stride = x*out_n*bytes;
- stbi__uint32 img_len, img_width_bytes;
- int k;
- int img_n = s->img_n; // copy it into a local for later
-
- int output_bytes = out_n*bytes;
- int filter_bytes = img_n*bytes;
- int width = x;
-
- STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1);
- a->out = (stbi_uc *) stbi__malloc_mad3(x, y, output_bytes, 0); // extra bytes to write off the end into
- if (!a->out) return stbi__err("outofmem", "Out of memory");
-
- img_width_bytes = (((img_n * x * depth) + 7) >> 3);
- img_len = (img_width_bytes + 1) * y;
- // we used to check for exact match between raw_len and img_len on non-interlaced PNGs,
- // but issue #276 reported a PNG in the wild that had extra data at the end (all zeros),
- // so just check for raw_len < img_len always.
- if (raw_len < img_len) return stbi__err("not enough pixels","Corrupt PNG");
-
- for (j=0; j < y; ++j) {
- stbi_uc *cur = a->out + stride*j;
- stbi_uc *prior;
- int filter = *raw++;
-
- if (filter > 4)
- return stbi__err("invalid filter","Corrupt PNG");
-
- if (depth < 8) {
- STBI_ASSERT(img_width_bytes <= x);
- cur += x*out_n - img_width_bytes; // store output to the rightmost img_len bytes, so we can decode in place
- filter_bytes = 1;
- width = img_width_bytes;
- }
- prior = cur - stride; // bugfix: need to compute this after 'cur +=' computation above
-
- // if first row, use special filter that doesn't sample previous row
- if (j == 0) filter = first_row_filter[filter];
-
- // handle first byte explicitly
- for (k=0; k < filter_bytes; ++k) {
- switch (filter) {
- case STBI__F_none : cur[k] = raw[k]; break;
- case STBI__F_sub : cur[k] = raw[k]; break;
- case STBI__F_up : cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break;
- case STBI__F_avg : cur[k] = STBI__BYTECAST(raw[k] + (prior[k]>>1)); break;
- case STBI__F_paeth : cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(0,prior[k],0)); break;
- case STBI__F_avg_first : cur[k] = raw[k]; break;
- case STBI__F_paeth_first: cur[k] = raw[k]; break;
- }
- }
-
- if (depth == 8) {
- if (img_n != out_n)
- cur[img_n] = 255; // first pixel
- raw += img_n;
- cur += out_n;
- prior += out_n;
- } else if (depth == 16) {
- if (img_n != out_n) {
- cur[filter_bytes] = 255; // first pixel top byte
- cur[filter_bytes+1] = 255; // first pixel bottom byte
- }
- raw += filter_bytes;
- cur += output_bytes;
- prior += output_bytes;
- } else {
- raw += 1;
- cur += 1;
- prior += 1;
- }
-
- // this is a little gross, so that we don't switch per-pixel or per-component
- if (depth < 8 || img_n == out_n) {
- int nk = (width - 1)*filter_bytes;
- #define STBI__CASE(f) \
- case f: \
- for (k=0; k < nk; ++k)
- switch (filter) {
+static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw,
+ stbi__uint32 raw_len, int out_n,
+ stbi__uint32 x, stbi__uint32 y, int depth,
+ int color)
+{
+ int bytes = (depth == 16 ? 2 : 1);
+ stbi__context *s = a->s;
+ stbi__uint32 i, j, stride = x * out_n * bytes;
+ stbi__uint32 img_len, img_width_bytes;
+ int k;
+ int img_n = s->img_n; // copy it into a local for later
+
+ int output_bytes = out_n * bytes;
+ int filter_bytes = img_n * bytes;
+ int width = x;
+
+ STBI_ASSERT(out_n == s->img_n || out_n == s->img_n + 1);
+ a->out = (stbi_uc *)stbi__malloc_mad3(
+ x, y, output_bytes, 0); // extra bytes to write off the end into
+ if (!a->out)
+ return stbi__err("outofmem", "Out of memory");
+
+ img_width_bytes = (((img_n * x * depth) + 7) >> 3);
+ img_len = (img_width_bytes + 1) * y;
+ // we used to check for exact match between raw_len and img_len on
+ // non-interlaced PNGs, but issue #276 reported a PNG in the wild that had
+ // extra data at the end (all zeros), so just check for raw_len < img_len
+ // always.
+ if (raw_len < img_len)
+ return stbi__err("not enough pixels", "Corrupt PNG");
+
+ for (j = 0; j < y; ++j) {
+ stbi_uc *cur = a->out + stride * j;
+ stbi_uc *prior;
+ int filter = *raw++;
+
+ if (filter > 4)
+ return stbi__err("invalid filter", "Corrupt PNG");
+
+ if (depth < 8) {
+ STBI_ASSERT(img_width_bytes <= x);
+ cur += x * out_n - img_width_bytes; // store output to the rightmost
+ // img_len bytes, so we can
+ // decode in place
+ filter_bytes = 1;
+ width = img_width_bytes;
+ }
+ prior = cur - stride; // bugfix: need to compute this after 'cur +='
+ // computation above
+
+ // if first row, use special filter that doesn't sample previous row
+ if (j == 0)
+ filter = first_row_filter[filter];
+
+ // handle first byte explicitly
+ for (k = 0; k < filter_bytes; ++k) {
+ switch (filter) {
+ case STBI__F_none:
+ cur[k] = raw[k];
+ break;
+ case STBI__F_sub:
+ cur[k] = raw[k];
+ break;
+ case STBI__F_up:
+ cur[k] = STBI__BYTECAST(raw[k] + prior[k]);
+ break;
+ case STBI__F_avg:
+ cur[k] = STBI__BYTECAST(raw[k] + (prior[k] >> 1));
+ break;
+ case STBI__F_paeth:
+ cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(0, prior[k], 0));
+ break;
+ case STBI__F_avg_first:
+ cur[k] = raw[k];
+ break;
+ case STBI__F_paeth_first:
+ cur[k] = raw[k];
+ break;
+ }
+ }
+
+ if (depth == 8) {
+ if (img_n != out_n)
+ cur[img_n] = 255; // first pixel
+ raw += img_n;
+ cur += out_n;
+ prior += out_n;
+ } else if (depth == 16) {
+ if (img_n != out_n) {
+ cur[filter_bytes] = 255; // first pixel top byte
+ cur[filter_bytes + 1] = 255; // first pixel bottom byte
+ }
+ raw += filter_bytes;
+ cur += output_bytes;
+ prior += output_bytes;
+ } else {
+ raw += 1;
+ cur += 1;
+ prior += 1;
+ }
+
+ // this is a little gross, so that we don't switch per-pixel or
+ // per-component
+ if (depth < 8 || img_n == out_n) {
+ int nk = (width - 1) * filter_bytes;
+#define STBI__CASE(f) \
+ case f: \
+ for (k = 0; k < nk; ++k)
+ switch (filter) {
// "none" filter turns into a memcpy here; make that explicit.
- case STBI__F_none: memcpy(cur, raw, nk); break;
- STBI__CASE(STBI__F_sub) { cur[k] = STBI__BYTECAST(raw[k] + cur[k-filter_bytes]); } break;
- STBI__CASE(STBI__F_up) { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); } break;
- STBI__CASE(STBI__F_avg) { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-filter_bytes])>>1)); } break;
- STBI__CASE(STBI__F_paeth) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],prior[k],prior[k-filter_bytes])); } break;
- STBI__CASE(STBI__F_avg_first) { cur[k] = STBI__BYTECAST(raw[k] + (cur[k-filter_bytes] >> 1)); } break;
- STBI__CASE(STBI__F_paeth_first) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],0,0)); } break;
- }
- #undef STBI__CASE
- raw += nk;
- } else {
- STBI_ASSERT(img_n+1 == out_n);
- #define STBI__CASE(f) \
- case f: \
- for (i=x-1; i >= 1; --i, cur[filter_bytes]=255,raw+=filter_bytes,cur+=output_bytes,prior+=output_bytes) \
- for (k=0; k < filter_bytes; ++k)
- switch (filter) {
- STBI__CASE(STBI__F_none) { cur[k] = raw[k]; } break;
- STBI__CASE(STBI__F_sub) { cur[k] = STBI__BYTECAST(raw[k] + cur[k- output_bytes]); } break;
- STBI__CASE(STBI__F_up) { cur[k] = STBI__BYTECAST(raw[k] + prior[k]); } break;
- STBI__CASE(STBI__F_avg) { cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k- output_bytes])>>1)); } break;
- STBI__CASE(STBI__F_paeth) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k- output_bytes],prior[k],prior[k- output_bytes])); } break;
- STBI__CASE(STBI__F_avg_first) { cur[k] = STBI__BYTECAST(raw[k] + (cur[k- output_bytes] >> 1)); } break;
- STBI__CASE(STBI__F_paeth_first) { cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k- output_bytes],0,0)); } break;
- }
- #undef STBI__CASE
-
- // the loop above sets the high byte of the pixels' alpha, but for
- // 16 bit png files we also need the low byte set. we'll do that here.
- if (depth == 16) {
- cur = a->out + stride*j; // start at the beginning of the row again
- for (i=0; i < x; ++i,cur+=output_bytes) {
- cur[filter_bytes+1] = 255;
+ case STBI__F_none:
+ memcpy(cur, raw, nk);
+ break;
+ STBI__CASE(STBI__F_sub)
+ {
+ cur[k] = STBI__BYTECAST(raw[k] + cur[k - filter_bytes]);
+ }
+ break;
+ STBI__CASE(STBI__F_up)
+ {
+ cur[k] = STBI__BYTECAST(raw[k] + prior[k]);
+ }
+ break;
+ STBI__CASE(STBI__F_avg)
+ {
+ cur[k] = STBI__BYTECAST(
+ raw[k] + ((prior[k] + cur[k - filter_bytes]) >> 1));
+ }
+ break;
+ STBI__CASE(STBI__F_paeth)
+ {
+ cur[k] = STBI__BYTECAST(
+ raw[k] + stbi__paeth(cur[k - filter_bytes], prior[k],
+ prior[k - filter_bytes]));
+ }
+ break;
+ STBI__CASE(STBI__F_avg_first)
+ {
+ cur[k] =
+ STBI__BYTECAST(raw[k] + (cur[k - filter_bytes] >> 1));
+ }
+ break;
+ STBI__CASE(STBI__F_paeth_first)
+ {
+ cur[k] = STBI__BYTECAST(
+ raw[k] + stbi__paeth(cur[k - filter_bytes], 0, 0));
+ }
+ break;
}
- }
- }
- }
-
- // we make a separate pass to expand bits to pixels; for performance,
- // this could run two scanlines behind the above code, so it won't
- // intefere with filtering but will still be in the cache.
- if (depth < 8) {
- for (j=0; j < y; ++j) {
- stbi_uc *cur = a->out + stride*j;
- stbi_uc *in = a->out + stride*j + x*out_n - img_width_bytes;
- // unpack 1/2/4-bit into a 8-bit buffer. allows us to keep the common 8-bit path optimal at minimal cost for 1/2/4-bit
- // png guarante byte alignment, if width is not multiple of 8/4/2 we'll decode dummy trailing data that will be skipped in the later loop
- stbi_uc scale = (color == 0) ? stbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range
-
- // note that the final byte might overshoot and write more data than desired.
- // we can allocate enough data that this never writes out of memory, but it
- // could also overwrite the next scanline. can it overwrite non-empty data
- // on the next scanline? yes, consider 1-pixel-wide scanlines with 1-bit-per-pixel.
- // so we need to explicitly clamp the final ones
-
- if (depth == 4) {
- for (k=x*img_n; k >= 2; k-=2, ++in) {
- *cur++ = scale * ((*in >> 4) );
- *cur++ = scale * ((*in ) & 0x0f);
+#undef STBI__CASE
+ raw += nk;
+ } else {
+ STBI_ASSERT(img_n + 1 == out_n);
+#define STBI__CASE(f) \
+ case f: \
+ for (i = x - 1; i >= 1; --i, cur[filter_bytes] = 255, \
+ raw += filter_bytes, cur += output_bytes, prior += output_bytes) \
+ for (k = 0; k < filter_bytes; ++k)
+ switch (filter) {
+ STBI__CASE(STBI__F_none) { cur[k] = raw[k]; }
+ break;
+ STBI__CASE(STBI__F_sub)
+ {
+ cur[k] = STBI__BYTECAST(raw[k] + cur[k - output_bytes]);
+ }
+ break;
+ STBI__CASE(STBI__F_up)
+ {
+ cur[k] = STBI__BYTECAST(raw[k] + prior[k]);
+ }
+ break;
+ STBI__CASE(STBI__F_avg)
+ {
+ cur[k] = STBI__BYTECAST(
+ raw[k] + ((prior[k] + cur[k - output_bytes]) >> 1));
+ }
+ break;
+ STBI__CASE(STBI__F_paeth)
+ {
+ cur[k] = STBI__BYTECAST(
+ raw[k] + stbi__paeth(cur[k - output_bytes], prior[k],
+ prior[k - output_bytes]));
+ }
+ break;
+ STBI__CASE(STBI__F_avg_first)
+ {
+ cur[k] =
+ STBI__BYTECAST(raw[k] + (cur[k - output_bytes] >> 1));
+ }
+ break;
+ STBI__CASE(STBI__F_paeth_first)
+ {
+ cur[k] = STBI__BYTECAST(
+ raw[k] + stbi__paeth(cur[k - output_bytes], 0, 0));
+ }
+ break;
}
- if (k > 0) *cur++ = scale * ((*in >> 4) );
- } else if (depth == 2) {
- for (k=x*img_n; k >= 4; k-=4, ++in) {
- *cur++ = scale * ((*in >> 6) );
- *cur++ = scale * ((*in >> 4) & 0x03);
- *cur++ = scale * ((*in >> 2) & 0x03);
- *cur++ = scale * ((*in ) & 0x03);
+#undef STBI__CASE
+
+ // the loop above sets the high byte of the pixels' alpha, but for
+ // 16 bit png files we also need the low byte set. we'll do that
+ // here.
+ if (depth == 16) {
+ cur = a->out +
+ stride * j; // start at the beginning of the row again
+ for (i = 0; i < x; ++i, cur += output_bytes) {
+ cur[filter_bytes + 1] = 255;
+ }
}
- if (k > 0) *cur++ = scale * ((*in >> 6) );
- if (k > 1) *cur++ = scale * ((*in >> 4) & 0x03);
- if (k > 2) *cur++ = scale * ((*in >> 2) & 0x03);
- } else if (depth == 1) {
- for (k=x*img_n; k >= 8; k-=8, ++in) {
- *cur++ = scale * ((*in >> 7) );
- *cur++ = scale * ((*in >> 6) & 0x01);
- *cur++ = scale * ((*in >> 5) & 0x01);
- *cur++ = scale * ((*in >> 4) & 0x01);
- *cur++ = scale * ((*in >> 3) & 0x01);
- *cur++ = scale * ((*in >> 2) & 0x01);
- *cur++ = scale * ((*in >> 1) & 0x01);
- *cur++ = scale * ((*in ) & 0x01);
+ }
+ }
+
+ // we make a separate pass to expand bits to pixels; for performance,
+ // this could run two scanlines behind the above code, so it won't
+ // intefere with filtering but will still be in the cache.
+ if (depth < 8) {
+ for (j = 0; j < y; ++j) {
+ stbi_uc *cur = a->out + stride * j;
+ stbi_uc *in = a->out + stride * j + x * out_n - img_width_bytes;
+ // unpack 1/2/4-bit into a 8-bit buffer. allows us to keep the
+ // common 8-bit path optimal at minimal cost for 1/2/4-bit png
+ // guarante byte alignment, if width is not multiple of 8/4/2 we'll
+ // decode dummy trailing data that will be skipped in the later loop
+ stbi_uc scale = (color == 0)
+ ? stbi__depth_scale_table[depth]
+ : 1; // scale grayscale values to 0..255 range
+
+ // note that the final byte might overshoot and write more data than
+ // desired. we can allocate enough data that this never writes out
+ // of memory, but it could also overwrite the next scanline. can it
+ // overwrite non-empty data on the next scanline? yes, consider
+ // 1-pixel-wide scanlines with 1-bit-per-pixel. so we need to
+ // explicitly clamp the final ones
+
+ if (depth == 4) {
+ for (k = x * img_n; k >= 2; k -= 2, ++in) {
+ *cur++ = scale * ((*in >> 4));
+ *cur++ = scale * ((*in) & 0x0f);
+ }
+ if (k > 0)
+ *cur++ = scale * ((*in >> 4));
+ } else if (depth == 2) {
+ for (k = x * img_n; k >= 4; k -= 4, ++in) {
+ *cur++ = scale * ((*in >> 6));
+ *cur++ = scale * ((*in >> 4) & 0x03);
+ *cur++ = scale * ((*in >> 2) & 0x03);
+ *cur++ = scale * ((*in) & 0x03);
+ }
+ if (k > 0)
+ *cur++ = scale * ((*in >> 6));
+ if (k > 1)
+ *cur++ = scale * ((*in >> 4) & 0x03);
+ if (k > 2)
+ *cur++ = scale * ((*in >> 2) & 0x03);
+ } else if (depth == 1) {
+ for (k = x * img_n; k >= 8; k -= 8, ++in) {
+ *cur++ = scale * ((*in >> 7));
+ *cur++ = scale * ((*in >> 6) & 0x01);
+ *cur++ = scale * ((*in >> 5) & 0x01);
+ *cur++ = scale * ((*in >> 4) & 0x01);
+ *cur++ = scale * ((*in >> 3) & 0x01);
+ *cur++ = scale * ((*in >> 2) & 0x01);
+ *cur++ = scale * ((*in >> 1) & 0x01);
+ *cur++ = scale * ((*in) & 0x01);
+ }
+ if (k > 0)
+ *cur++ = scale * ((*in >> 7));
+ if (k > 1)
+ *cur++ = scale * ((*in >> 6) & 0x01);
+ if (k > 2)
+ *cur++ = scale * ((*in >> 5) & 0x01);
+ if (k > 3)
+ *cur++ = scale * ((*in >> 4) & 0x01);
+ if (k > 4)
+ *cur++ = scale * ((*in >> 3) & 0x01);
+ if (k > 5)
+ *cur++ = scale * ((*in >> 2) & 0x01);
+ if (k > 6)
+ *cur++ = scale * ((*in >> 1) & 0x01);
}
- if (k > 0) *cur++ = scale * ((*in >> 7) );
- if (k > 1) *cur++ = scale * ((*in >> 6) & 0x01);
- if (k > 2) *cur++ = scale * ((*in >> 5) & 0x01);
- if (k > 3) *cur++ = scale * ((*in >> 4) & 0x01);
- if (k > 4) *cur++ = scale * ((*in >> 3) & 0x01);
- if (k > 5) *cur++ = scale * ((*in >> 2) & 0x01);
- if (k > 6) *cur++ = scale * ((*in >> 1) & 0x01);
- }
- if (img_n != out_n) {
- int q;
- // insert alpha = 255
- cur = a->out + stride*j;
- if (img_n == 1) {
- for (q=x-1; q >= 0; --q) {
- cur[q*2+1] = 255;
- cur[q*2+0] = cur[q];
- }
- } else {
- STBI_ASSERT(img_n == 3);
- for (q=x-1; q >= 0; --q) {
- cur[q*4+3] = 255;
- cur[q*4+2] = cur[q*3+2];
- cur[q*4+1] = cur[q*3+1];
- cur[q*4+0] = cur[q*3+0];
- }
+ if (img_n != out_n) {
+ int q;
+ // insert alpha = 255
+ cur = a->out + stride * j;
+ if (img_n == 1) {
+ for (q = x - 1; q >= 0; --q) {
+ cur[q * 2 + 1] = 255;
+ cur[q * 2 + 0] = cur[q];
+ }
+ } else {
+ STBI_ASSERT(img_n == 3);
+ for (q = x - 1; q >= 0; --q) {
+ cur[q * 4 + 3] = 255;
+ cur[q * 4 + 2] = cur[q * 3 + 2];
+ cur[q * 4 + 1] = cur[q * 3 + 1];
+ cur[q * 4 + 0] = cur[q * 3 + 0];
+ }
+ }
}
- }
- }
- } else if (depth == 16) {
- // force the image data from big-endian to platform-native.
- // this is done in a separate pass due to the decoding relying
- // on the data being untouched, but could probably be done
- // per-line during decode if care is taken.
- stbi_uc *cur = a->out;
- stbi__uint16 *cur16 = (stbi__uint16*)cur;
-
- for(i=0; i < x*y*out_n; ++i,cur16++,cur+=2) {
- *cur16 = (cur[0] << 8) | cur[1];
- }
- }
-
- return 1;
-}
-
-static int stbi__create_png_image(stbi__png *a, stbi_uc *image_data, stbi__uint32 image_data_len, int out_n, int depth, int color, int interlaced)
-{
- int bytes = (depth == 16 ? 2 : 1);
- int out_bytes = out_n * bytes;
- stbi_uc *final;
- int p;
- if (!interlaced)
- return stbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x, a->s->img_y, depth, color);
-
- // de-interlacing
- final = (stbi_uc *) stbi__malloc_mad3(a->s->img_x, a->s->img_y, out_bytes, 0);
- for (p=0; p < 7; ++p) {
- int xorig[] = { 0,4,0,2,0,1,0 };
- int yorig[] = { 0,0,4,0,2,0,1 };
- int xspc[] = { 8,8,4,4,2,2,1 };
- int yspc[] = { 8,8,8,4,4,2,2 };
- int i,j,x,y;
- // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1
- x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p];
- y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p];
- if (x && y) {
- stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y;
- if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) {
- STBI_FREE(final);
- return 0;
- }
- for (j=0; j < y; ++j) {
- for (i=0; i < x; ++i) {
- int out_y = j*yspc[p]+yorig[p];
- int out_x = i*xspc[p]+xorig[p];
- memcpy(final + out_y*a->s->img_x*out_bytes + out_x*out_bytes,
- a->out + (j*x+i)*out_bytes, out_bytes);
+ }
+ } else if (depth == 16) {
+ // force the image data from big-endian to platform-native.
+ // this is done in a separate pass due to the decoding relying
+ // on the data being untouched, but could probably be done
+ // per-line during decode if care is taken.
+ stbi_uc *cur = a->out;
+ stbi__uint16 *cur16 = (stbi__uint16 *)cur;
+
+ for (i = 0; i < x * y * out_n; ++i, cur16++, cur += 2) {
+ *cur16 = (cur[0] << 8) | cur[1];
+ }
+ }
+
+ return 1;
+}
+
+static int stbi__create_png_image(stbi__png *a, stbi_uc *image_data,
+ stbi__uint32 image_data_len, int out_n,
+ int depth, int color, int interlaced)
+{
+ int bytes = (depth == 16 ? 2 : 1);
+ int out_bytes = out_n * bytes;
+ stbi_uc *final;
+ int p;
+ if (!interlaced)
+ return stbi__create_png_image_raw(a, image_data, image_data_len, out_n,
+ a->s->img_x, a->s->img_y, depth,
+ color);
+
+ // de-interlacing
+ final =
+ (stbi_uc *)stbi__malloc_mad3(a->s->img_x, a->s->img_y, out_bytes, 0);
+ for (p = 0; p < 7; ++p) {
+ int xorig[] = {0, 4, 0, 2, 0, 1, 0};
+ int yorig[] = {0, 0, 4, 0, 2, 0, 1};
+ int xspc[] = {8, 8, 4, 4, 2, 2, 1};
+ int yspc[] = {8, 8, 8, 4, 4, 2, 2};
+ int i, j, x, y;
+ // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1
+ x = (a->s->img_x - xorig[p] + xspc[p] - 1) / xspc[p];
+ y = (a->s->img_y - yorig[p] + yspc[p] - 1) / yspc[p];
+ if (x && y) {
+ stbi__uint32 img_len =
+ ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y;
+ if (!stbi__create_png_image_raw(a, image_data, image_data_len,
+ out_n, x, y, depth, color)) {
+ STBI_FREE(final);
+ return 0;
}
- }
- STBI_FREE(a->out);
- image_data += img_len;
- image_data_len -= img_len;
- }
- }
- a->out = final;
+ for (j = 0; j < y; ++j) {
+ for (i = 0; i < x; ++i) {
+ int out_y = j * yspc[p] + yorig[p];
+ int out_x = i * xspc[p] + xorig[p];
+ memcpy(final + out_y * a->s->img_x * out_bytes +
+ out_x * out_bytes,
+ a->out + (j * x + i) * out_bytes, out_bytes);
+ }
+ }
+ STBI_FREE(a->out);
+ image_data += img_len;
+ image_data_len -= img_len;
+ }
+ }
+ a->out = final;
- return 1;
+ return 1;
}
static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n)
{
- stbi__context *s = z->s;
- stbi__uint32 i, pixel_count = s->img_x * s->img_y;
- stbi_uc *p = z->out;
-
- // compute color-based transparency, assuming we've
- // already got 255 as the alpha value in the output
- STBI_ASSERT(out_n == 2 || out_n == 4);
-
- if (out_n == 2) {
- for (i=0; i < pixel_count; ++i) {
- p[1] = (p[0] == tc[0] ? 0 : 255);
- p += 2;
- }
- } else {
- for (i=0; i < pixel_count; ++i) {
- if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
- p[3] = 0;
- p += 4;
- }
- }
- return 1;
-}
-
-static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3], int out_n)
-{
- stbi__context *s = z->s;
- stbi__uint32 i, pixel_count = s->img_x * s->img_y;
- stbi__uint16 *p = (stbi__uint16*) z->out;
-
- // compute color-based transparency, assuming we've
- // already got 65535 as the alpha value in the output
- STBI_ASSERT(out_n == 2 || out_n == 4);
-
- if (out_n == 2) {
- for (i = 0; i < pixel_count; ++i) {
- p[1] = (p[0] == tc[0] ? 0 : 65535);
- p += 2;
- }
- } else {
- for (i = 0; i < pixel_count; ++i) {
- if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
- p[3] = 0;
- p += 4;
- }
- }
- return 1;
-}
-
-static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n)
-{
- stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y;
- stbi_uc *p, *temp_out, *orig = a->out;
-
- p = (stbi_uc *) stbi__malloc_mad2(pixel_count, pal_img_n, 0);
- if (p == NULL) return stbi__err("outofmem", "Out of memory");
-
- // between here and free(out) below, exitting would leak
- temp_out = p;
-
- if (pal_img_n == 3) {
- for (i=0; i < pixel_count; ++i) {
- int n = orig[i]*4;
- p[0] = palette[n ];
- p[1] = palette[n+1];
- p[2] = palette[n+2];
- p += 3;
- }
- } else {
- for (i=0; i < pixel_count; ++i) {
- int n = orig[i]*4;
- p[0] = palette[n ];
- p[1] = palette[n+1];
- p[2] = palette[n+2];
- p[3] = palette[n+3];
- p += 4;
- }
- }
- STBI_FREE(a->out);
- a->out = temp_out;
-
- STBI_NOTUSED(len);
-
- return 1;
+ stbi__context *s = z->s;
+ stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+ stbi_uc *p = z->out;
+
+ // compute color-based transparency, assuming we've
+ // already got 255 as the alpha value in the output
+ STBI_ASSERT(out_n == 2 || out_n == 4);
+
+ if (out_n == 2) {
+ for (i = 0; i < pixel_count; ++i) {
+ p[1] = (p[0] == tc[0] ? 0 : 255);
+ p += 2;
+ }
+ } else {
+ for (i = 0; i < pixel_count; ++i) {
+ if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
+ p[3] = 0;
+ p += 4;
+ }
+ }
+ return 1;
+}
+
+static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3],
+ int out_n)
+{
+ stbi__context *s = z->s;
+ stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+ stbi__uint16 *p = (stbi__uint16 *)z->out;
+
+ // compute color-based transparency, assuming we've
+ // already got 65535 as the alpha value in the output
+ STBI_ASSERT(out_n == 2 || out_n == 4);
+
+ if (out_n == 2) {
+ for (i = 0; i < pixel_count; ++i) {
+ p[1] = (p[0] == tc[0] ? 0 : 65535);
+ p += 2;
+ }
+ } else {
+ for (i = 0; i < pixel_count; ++i) {
+ if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
+ p[3] = 0;
+ p += 4;
+ }
+ }
+ return 1;
+}
+
+static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len,
+ int pal_img_n)
+{
+ stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y;
+ stbi_uc *p, *temp_out, *orig = a->out;
+
+ p = (stbi_uc *)stbi__malloc_mad2(pixel_count, pal_img_n, 0);
+ if (p == NULL)
+ return stbi__err("outofmem", "Out of memory");
+
+ // between here and free(out) below, exitting would leak
+ temp_out = p;
+
+ if (pal_img_n == 3) {
+ for (i = 0; i < pixel_count; ++i) {
+ int n = orig[i] * 4;
+ p[0] = palette[n];
+ p[1] = palette[n + 1];
+ p[2] = palette[n + 2];
+ p += 3;
+ }
+ } else {
+ for (i = 0; i < pixel_count; ++i) {
+ int n = orig[i] * 4;
+ p[0] = palette[n];
+ p[1] = palette[n + 1];
+ p[2] = palette[n + 2];
+ p[3] = palette[n + 3];
+ p += 4;
+ }
+ }
+ STBI_FREE(a->out);
+ a->out = temp_out;
+
+ STBI_NOTUSED(len);
+
+ return 1;
}
static int stbi__unpremultiply_on_load = 0;
-static int stbi__de_iphone_flag = 0;
+static int stbi__de_iphone_flag = 0;
-STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply)
+STBIDEF void
+stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply)
{
- stbi__unpremultiply_on_load = flag_true_if_should_unpremultiply;
+ stbi__unpremultiply_on_load = flag_true_if_should_unpremultiply;
}
STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert)
{
- stbi__de_iphone_flag = flag_true_if_should_convert;
+ stbi__de_iphone_flag = flag_true_if_should_convert;
}
static void stbi__de_iphone(stbi__png *z)
{
- stbi__context *s = z->s;
- stbi__uint32 i, pixel_count = s->img_x * s->img_y;
- stbi_uc *p = z->out;
-
- if (s->img_out_n == 3) { // convert bgr to rgb
- for (i=0; i < pixel_count; ++i) {
- stbi_uc t = p[0];
- p[0] = p[2];
- p[2] = t;
- p += 3;
- }
- } else {
- STBI_ASSERT(s->img_out_n == 4);
- if (stbi__unpremultiply_on_load) {
- // convert bgr to rgb and unpremultiply
- for (i=0; i < pixel_count; ++i) {
- stbi_uc a = p[3];
+ stbi__context *s = z->s;
+ stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+ stbi_uc *p = z->out;
+
+ if (s->img_out_n == 3) { // convert bgr to rgb
+ for (i = 0; i < pixel_count; ++i) {
stbi_uc t = p[0];
- if (a) {
- stbi_uc half = a / 2;
- p[0] = (p[2] * 255 + half) / a;
- p[1] = (p[1] * 255 + half) / a;
- p[2] = ( t * 255 + half) / a;
- } else {
- p[0] = p[2];
- p[2] = t;
+ p[0] = p[2];
+ p[2] = t;
+ p += 3;
+ }
+ } else {
+ STBI_ASSERT(s->img_out_n == 4);
+ if (stbi__unpremultiply_on_load) {
+ // convert bgr to rgb and unpremultiply
+ for (i = 0; i < pixel_count; ++i) {
+ stbi_uc a = p[3];
+ stbi_uc t = p[0];
+ if (a) {
+ stbi_uc half = a / 2;
+ p[0] = (p[2] * 255 + half) / a;
+ p[1] = (p[1] * 255 + half) / a;
+ p[2] = (t * 255 + half) / a;
+ } else {
+ p[0] = p[2];
+ p[2] = t;
+ }
+ p += 4;
}
- p += 4;
- }
- } else {
- // convert bgr to rgb
- for (i=0; i < pixel_count; ++i) {
- stbi_uc t = p[0];
- p[0] = p[2];
- p[2] = t;
- p += 4;
- }
- }
- }
+ } else {
+ // convert bgr to rgb
+ for (i = 0; i < pixel_count; ++i) {
+ stbi_uc t = p[0];
+ p[0] = p[2];
+ p[2] = t;
+ p += 4;
+ }
+ }
+ }
}
-#define STBI__PNG_TYPE(a,b,c,d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
+#define STBI__PNG_TYPE(a, b, c, d) \
+ (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
{
- stbi_uc palette[1024], pal_img_n=0;
- stbi_uc has_trans=0, tc[3];
- stbi__uint16 tc16[3];
- stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0;
- int first=1,k,interlace=0, color=0, is_iphone=0;
- stbi__context *s = z->s;
+ stbi_uc palette[1024], pal_img_n = 0;
+ stbi_uc has_trans = 0, tc[3];
+ stbi__uint16 tc16[3];
+ stbi__uint32 ioff = 0, idata_limit = 0, i, pal_len = 0;
+ int first = 1, k, interlace = 0, color = 0, is_iphone = 0;
+ stbi__context *s = z->s;
- z->expanded = NULL;
- z->idata = NULL;
- z->out = NULL;
+ z->expanded = NULL;
+ z->idata = NULL;
+ z->out = NULL;
- if (!stbi__check_png_header(s)) return 0;
+ if (!stbi__check_png_header(s))
+ return 0;
- if (scan == STBI__SCAN_type) return 1;
+ if (scan == STBI__SCAN_type)
+ return 1;
- for (;;) {
- stbi__pngchunk c = stbi__get_chunk_header(s);
- switch (c.type) {
- case STBI__PNG_TYPE('C','g','B','I'):
+ for (;;) {
+ stbi__pngchunk c = stbi__get_chunk_header(s);
+ switch (c.type) {
+ case STBI__PNG_TYPE('C', 'g', 'B', 'I'):
is_iphone = 1;
stbi__skip(s, c.length);
break;
- case STBI__PNG_TYPE('I','H','D','R'): {
- int comp,filter;
- if (!first) return stbi__err("multiple IHDR","Corrupt PNG");
+ case STBI__PNG_TYPE('I', 'H', 'D', 'R'): {
+ int comp, filter;
+ if (!first)
+ return stbi__err("multiple IHDR", "Corrupt PNG");
first = 0;
- if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG");
- s->img_x = stbi__get32be(s); if (s->img_x > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)");
- s->img_y = stbi__get32be(s); if (s->img_y > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)");
- z->depth = stbi__get8(s); if (z->depth != 1 && z->depth != 2 && z->depth != 4 && z->depth != 8 && z->depth != 16) return stbi__err("1/2/4/8/16-bit only","PNG not supported: 1/2/4/8/16-bit only");
- color = stbi__get8(s); if (color > 6) return stbi__err("bad ctype","Corrupt PNG");
- if (color == 3 && z->depth == 16) return stbi__err("bad ctype","Corrupt PNG");
- if (color == 3) pal_img_n = 3; else if (color & 1) return stbi__err("bad ctype","Corrupt PNG");
- comp = stbi__get8(s); if (comp) return stbi__err("bad comp method","Corrupt PNG");
- filter= stbi__get8(s); if (filter) return stbi__err("bad filter method","Corrupt PNG");
- interlace = stbi__get8(s); if (interlace>1) return stbi__err("bad interlace method","Corrupt PNG");
- if (!s->img_x || !s->img_y) return stbi__err("0-pixel image","Corrupt PNG");
+ if (c.length != 13)
+ return stbi__err("bad IHDR len", "Corrupt PNG");
+ s->img_x = stbi__get32be(s);
+ if (s->img_x > (1 << 24))
+ return stbi__err("too large", "Very large image (corrupt?)");
+ s->img_y = stbi__get32be(s);
+ if (s->img_y > (1 << 24))
+ return stbi__err("too large", "Very large image (corrupt?)");
+ z->depth = stbi__get8(s);
+ if (z->depth != 1 && z->depth != 2 && z->depth != 4 &&
+ z->depth != 8 && z->depth != 16)
+ return stbi__err("1/2/4/8/16-bit only",
+ "PNG not supported: 1/2/4/8/16-bit only");
+ color = stbi__get8(s);
+ if (color > 6)
+ return stbi__err("bad ctype", "Corrupt PNG");
+ if (color == 3 && z->depth == 16)
+ return stbi__err("bad ctype", "Corrupt PNG");
+ if (color == 3)
+ pal_img_n = 3;
+ else if (color & 1)
+ return stbi__err("bad ctype", "Corrupt PNG");
+ comp = stbi__get8(s);
+ if (comp)
+ return stbi__err("bad comp method", "Corrupt PNG");
+ filter = stbi__get8(s);
+ if (filter)
+ return stbi__err("bad filter method", "Corrupt PNG");
+ interlace = stbi__get8(s);
+ if (interlace > 1)
+ return stbi__err("bad interlace method", "Corrupt PNG");
+ if (!s->img_x || !s->img_y)
+ return stbi__err("0-pixel image", "Corrupt PNG");
if (!pal_img_n) {
- s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
- if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode");
- if (scan == STBI__SCAN_header) return 1;
+ s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
+ if ((1 << 30) / s->img_x / s->img_n < s->img_y)
+ return stbi__err("too large", "Image too large to decode");
+ if (scan == STBI__SCAN_header)
+ return 1;
} else {
- // if paletted, then pal_n is our final components, and
- // img_n is # components to decompress/filter.
- s->img_n = 1;
- if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG");
- // if SCAN_header, have to scan to see if we have a tRNS
+ // if paletted, then pal_n is our final components, and
+ // img_n is # components to decompress/filter.
+ s->img_n = 1;
+ if ((1 << 30) / s->img_x / 4 < s->img_y)
+ return stbi__err("too large", "Corrupt PNG");
+ // if SCAN_header, have to scan to see if we have a tRNS
}
break;
- }
+ }
- case STBI__PNG_TYPE('P','L','T','E'): {
- if (first) return stbi__err("first not IHDR", "Corrupt PNG");
- if (c.length > 256*3) return stbi__err("invalid PLTE","Corrupt PNG");
+ case STBI__PNG_TYPE('P', 'L', 'T', 'E'): {
+ if (first)
+ return stbi__err("first not IHDR", "Corrupt PNG");
+ if (c.length > 256 * 3)
+ return stbi__err("invalid PLTE", "Corrupt PNG");
pal_len = c.length / 3;
- if (pal_len * 3 != c.length) return stbi__err("invalid PLTE","Corrupt PNG");
- for (i=0; i < pal_len; ++i) {
- palette[i*4+0] = stbi__get8(s);
- palette[i*4+1] = stbi__get8(s);
- palette[i*4+2] = stbi__get8(s);
- palette[i*4+3] = 255;
+ if (pal_len * 3 != c.length)
+ return stbi__err("invalid PLTE", "Corrupt PNG");
+ for (i = 0; i < pal_len; ++i) {
+ palette[i * 4 + 0] = stbi__get8(s);
+ palette[i * 4 + 1] = stbi__get8(s);
+ palette[i * 4 + 2] = stbi__get8(s);
+ palette[i * 4 + 3] = 255;
}
break;
- }
+ }
- case STBI__PNG_TYPE('t','R','N','S'): {
- if (first) return stbi__err("first not IHDR", "Corrupt PNG");
- if (z->idata) return stbi__err("tRNS after IDAT","Corrupt PNG");
+ case STBI__PNG_TYPE('t', 'R', 'N', 'S'): {
+ if (first)
+ return stbi__err("first not IHDR", "Corrupt PNG");
+ if (z->idata)
+ return stbi__err("tRNS after IDAT", "Corrupt PNG");
if (pal_img_n) {
- if (scan == STBI__SCAN_header) { s->img_n = 4; return 1; }
- if (pal_len == 0) return stbi__err("tRNS before PLTE","Corrupt PNG");
- if (c.length > pal_len) return stbi__err("bad tRNS len","Corrupt PNG");
- pal_img_n = 4;
- for (i=0; i < c.length; ++i)
- palette[i*4+3] = stbi__get8(s);
+ if (scan == STBI__SCAN_header) {
+ s->img_n = 4;
+ return 1;
+ }
+ if (pal_len == 0)
+ return stbi__err("tRNS before PLTE", "Corrupt PNG");
+ if (c.length > pal_len)
+ return stbi__err("bad tRNS len", "Corrupt PNG");
+ pal_img_n = 4;
+ for (i = 0; i < c.length; ++i)
+ palette[i * 4 + 3] = stbi__get8(s);
} else {
- if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG");
- if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG");
- has_trans = 1;
- if (z->depth == 16) {
- for (k = 0; k < s->img_n; ++k) tc16[k] = (stbi__uint16)stbi__get16be(s); // copy the values as-is
- } else {
- for (k = 0; k < s->img_n; ++k) tc[k] = (stbi_uc)(stbi__get16be(s) & 255) * stbi__depth_scale_table[z->depth]; // non 8-bit images will be larger
- }
+ if (!(s->img_n & 1))
+ return stbi__err("tRNS with alpha", "Corrupt PNG");
+ if (c.length != (stbi__uint32)s->img_n * 2)
+ return stbi__err("bad tRNS len", "Corrupt PNG");
+ has_trans = 1;
+ if (z->depth == 16) {
+ for (k = 0; k < s->img_n; ++k)
+ tc16[k] = (stbi__uint16)stbi__get16be(
+ s); // copy the values as-is
+ } else {
+ for (k = 0; k < s->img_n; ++k)
+ tc[k] = (stbi_uc)(stbi__get16be(s) & 255) *
+ stbi__depth_scale_table[z->depth]; // non 8-bit
+ // images
+ // will be
+ // larger
+ }
}
break;
- }
+ }
- case STBI__PNG_TYPE('I','D','A','T'): {
- if (first) return stbi__err("first not IHDR", "Corrupt PNG");
- if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG");
- if (scan == STBI__SCAN_header) { s->img_n = pal_img_n; return 1; }
- if ((int)(ioff + c.length) < (int)ioff) return 0;
+ case STBI__PNG_TYPE('I', 'D', 'A', 'T'): {
+ if (first)
+ return stbi__err("first not IHDR", "Corrupt PNG");
+ if (pal_img_n && !pal_len)
+ return stbi__err("no PLTE", "Corrupt PNG");
+ if (scan == STBI__SCAN_header) {
+ s->img_n = pal_img_n;
+ return 1;
+ }
+ if ((int)(ioff + c.length) < (int)ioff)
+ return 0;
if (ioff + c.length > idata_limit) {
- stbi__uint32 idata_limit_old = idata_limit;
- stbi_uc *p;
- if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096;
- while (ioff + c.length > idata_limit)
- idata_limit *= 2;
- STBI_NOTUSED(idata_limit_old);
- p = (stbi_uc *) STBI_REALLOC_SIZED(z->idata, idata_limit_old, idata_limit); if (p == NULL) return stbi__err("outofmem", "Out of memory");
- z->idata = p;
+ stbi__uint32 idata_limit_old = idata_limit;
+ stbi_uc *p;
+ if (idata_limit == 0)
+ idata_limit = c.length > 4096 ? c.length : 4096;
+ while (ioff + c.length > idata_limit)
+ idata_limit *= 2;
+ STBI_NOTUSED(idata_limit_old);
+ p = (stbi_uc *)STBI_REALLOC_SIZED(z->idata, idata_limit_old,
+ idata_limit);
+ if (p == NULL)
+ return stbi__err("outofmem", "Out of memory");
+ z->idata = p;
}
- if (!stbi__getn(s, z->idata+ioff,c.length)) return stbi__err("outofdata","Corrupt PNG");
+ if (!stbi__getn(s, z->idata + ioff, c.length))
+ return stbi__err("outofdata", "Corrupt PNG");
ioff += c.length;
break;
- }
+ }
- case STBI__PNG_TYPE('I','E','N','D'): {
+ case STBI__PNG_TYPE('I', 'E', 'N', 'D'): {
stbi__uint32 raw_len, bpl;
- if (first) return stbi__err("first not IHDR", "Corrupt PNG");
- if (scan != STBI__SCAN_load) return 1;
- if (z->idata == NULL) return stbi__err("no IDAT","Corrupt PNG");
+ if (first)
+ return stbi__err("first not IHDR", "Corrupt PNG");
+ if (scan != STBI__SCAN_load)
+ return 1;
+ if (z->idata == NULL)
+ return stbi__err("no IDAT", "Corrupt PNG");
// initial guess for decoded data size to avoid unnecessary reallocs
- bpl = (s->img_x * z->depth + 7) / 8; // bytes per line, per component
- raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */;
- z->expanded = (stbi_uc *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, raw_len, (int *) &raw_len, !is_iphone);
- if (z->expanded == NULL) return 0; // zlib should set error
- STBI_FREE(z->idata); z->idata = NULL;
- if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans)
- s->img_out_n = s->img_n+1;
+ bpl =
+ (s->img_x * z->depth + 7) / 8; // bytes per line, per component
+ raw_len = bpl * s->img_y * s->img_n /* pixels */ +
+ s->img_y /* filter mode per row */;
+ z->expanded =
+ (stbi_uc *)stbi_zlib_decode_malloc_guesssize_headerflag(
+ (char *)z->idata, ioff, raw_len, (int *)&raw_len,
+ !is_iphone);
+ if (z->expanded == NULL)
+ return 0; // zlib should set error
+ STBI_FREE(z->idata);
+ z->idata = NULL;
+ if ((req_comp == s->img_n + 1 && req_comp != 3 && !pal_img_n) ||
+ has_trans)
+ s->img_out_n = s->img_n + 1;
else
- s->img_out_n = s->img_n;
- if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, z->depth, color, interlace)) return 0;
+ s->img_out_n = s->img_n;
+ if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n,
+ z->depth, color, interlace))
+ return 0;
if (has_trans) {
- if (z->depth == 16) {
- if (!stbi__compute_transparency16(z, tc16, s->img_out_n)) return 0;
- } else {
- if (!stbi__compute_transparency(z, tc, s->img_out_n)) return 0;
- }
+ if (z->depth == 16) {
+ if (!stbi__compute_transparency16(z, tc16, s->img_out_n))
+ return 0;
+ } else {
+ if (!stbi__compute_transparency(z, tc, s->img_out_n))
+ return 0;
+ }
}
if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2)
- stbi__de_iphone(z);
+ stbi__de_iphone(z);
if (pal_img_n) {
- // pal_img_n == 3 or 4
- s->img_n = pal_img_n; // record the actual colors we had
- s->img_out_n = pal_img_n;
- if (req_comp >= 3) s->img_out_n = req_comp;
- if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n))
- return 0;
+ // pal_img_n == 3 or 4
+ s->img_n = pal_img_n; // record the actual colors we had
+ s->img_out_n = pal_img_n;
+ if (req_comp >= 3)
+ s->img_out_n = req_comp;
+ if (!stbi__expand_png_palette(z, palette, pal_len,
+ s->img_out_n))
+ return 0;
} else if (has_trans) {
- // non-paletted image with tRNS -> source image has (constant) alpha
- ++s->img_n;
+ // non-paletted image with tRNS -> source image has (constant)
+ // alpha
+ ++s->img_n;
}
- STBI_FREE(z->expanded); z->expanded = NULL;
+ STBI_FREE(z->expanded);
+ z->expanded = NULL;
return 1;
- }
+ }
- default:
+ default:
// if critical, fail
- if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+ if (first)
+ return stbi__err("first not IHDR", "Corrupt PNG");
if ((c.type & (1 << 29)) == 0) {
- #ifndef STBI_NO_FAILURE_STRINGS
- // not threadsafe
- static char invalid_chunk[] = "XXXX PNG chunk not known";
- invalid_chunk[0] = STBI__BYTECAST(c.type >> 24);
- invalid_chunk[1] = STBI__BYTECAST(c.type >> 16);
- invalid_chunk[2] = STBI__BYTECAST(c.type >> 8);
- invalid_chunk[3] = STBI__BYTECAST(c.type >> 0);
- #endif
- return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type");
+#ifndef STBI_NO_FAILURE_STRINGS
+ // not threadsafe
+ static char invalid_chunk[] = "XXXX PNG chunk not known";
+ invalid_chunk[0] = STBI__BYTECAST(c.type >> 24);
+ invalid_chunk[1] = STBI__BYTECAST(c.type >> 16);
+ invalid_chunk[2] = STBI__BYTECAST(c.type >> 8);
+ invalid_chunk[3] = STBI__BYTECAST(c.type >> 0);
+#endif
+ return stbi__err(invalid_chunk,
+ "PNG not supported: unknown PNG chunk type");
}
stbi__skip(s, c.length);
break;
- }
- // end of PNG chunk, read and skip CRC
- stbi__get32be(s);
- }
-}
-
-static void *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp, stbi__result_info *ri)
-{
- void *result=NULL;
- if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
- if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) {
- if (p->depth < 8)
- ri->bits_per_channel = 8;
- else
- ri->bits_per_channel = p->depth;
- result = p->out;
- p->out = NULL;
- if (req_comp && req_comp != p->s->img_out_n) {
- if (ri->bits_per_channel == 8)
- result = stbi__convert_format((unsigned char *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
- else
- result = stbi__convert_format16((stbi__uint16 *) result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
- p->s->img_out_n = req_comp;
- if (result == NULL) return result;
- }
- *x = p->s->img_x;
- *y = p->s->img_y;
- if (n) *n = p->s->img_n;
- }
- STBI_FREE(p->out); p->out = NULL;
- STBI_FREE(p->expanded); p->expanded = NULL;
- STBI_FREE(p->idata); p->idata = NULL;
-
- return result;
-}
-
-static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
-{
- stbi__png p;
- p.s = s;
- return stbi__do_png(&p, x,y,comp,req_comp, ri);
+ }
+ // end of PNG chunk, read and skip CRC
+ stbi__get32be(s);
+ }
+}
+
+static void *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp,
+ stbi__result_info *ri)
+{
+ void *result = NULL;
+ if (req_comp < 0 || req_comp > 4)
+ return stbi__errpuc("bad req_comp", "Internal error");
+ if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) {
+ if (p->depth < 8)
+ ri->bits_per_channel = 8;
+ else
+ ri->bits_per_channel = p->depth;
+ result = p->out;
+ p->out = NULL;
+ if (req_comp && req_comp != p->s->img_out_n) {
+ if (ri->bits_per_channel == 8)
+ result = stbi__convert_format((unsigned char *)result,
+ p->s->img_out_n, req_comp,
+ p->s->img_x, p->s->img_y);
+ else
+ result = stbi__convert_format16((stbi__uint16 *)result,
+ p->s->img_out_n, req_comp,
+ p->s->img_x, p->s->img_y);
+ p->s->img_out_n = req_comp;
+ if (result == NULL)
+ return result;
+ }
+ *x = p->s->img_x;
+ *y = p->s->img_y;
+ if (n)
+ *n = p->s->img_n;
+ }
+ STBI_FREE(p->out);
+ p->out = NULL;
+ STBI_FREE(p->expanded);
+ p->expanded = NULL;
+ STBI_FREE(p->idata);
+ p->idata = NULL;
+
+ return result;
+}
+
+static void *stbi__png_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri)
+{
+ stbi__png p;
+ p.s = s;
+ return stbi__do_png(&p, x, y, comp, req_comp, ri);
}
static int stbi__png_test(stbi__context *s)
{
- int r;
- r = stbi__check_png_header(s);
- stbi__rewind(s);
- return r;
+ int r;
+ r = stbi__check_png_header(s);
+ stbi__rewind(s);
+ return r;
}
static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp)
{
- if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) {
- stbi__rewind( p->s );
- return 0;
- }
- if (x) *x = p->s->img_x;
- if (y) *y = p->s->img_y;
- if (comp) *comp = p->s->img_n;
- return 1;
+ if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) {
+ stbi__rewind(p->s);
+ return 0;
+ }
+ if (x)
+ *x = p->s->img_x;
+ if (y)
+ *y = p->s->img_y;
+ if (comp)
+ *comp = p->s->img_n;
+ return 1;
}
static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp)
{
- stbi__png p;
- p.s = s;
- return stbi__png_info_raw(&p, x, y, comp);
+ stbi__png p;
+ p.s = s;
+ return stbi__png_info_raw(&p, x, y, comp);
}
#endif
-// Microsoft/Windows BMP image
+ // Microsoft/Windows BMP image
#ifndef STBI_NO_BMP
static int stbi__bmp_test_raw(stbi__context *s)
{
- int r;
- int sz;
- if (stbi__get8(s) != 'B') return 0;
- if (stbi__get8(s) != 'M') return 0;
- stbi__get32le(s); // discard filesize
- stbi__get16le(s); // discard reserved
- stbi__get16le(s); // discard reserved
- stbi__get32le(s); // discard data offset
- sz = stbi__get32le(s);
- r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124);
- return r;
+ int r;
+ int sz;
+ if (stbi__get8(s) != 'B')
+ return 0;
+ if (stbi__get8(s) != 'M')
+ return 0;
+ stbi__get32le(s); // discard filesize
+ stbi__get16le(s); // discard reserved
+ stbi__get16le(s); // discard reserved
+ stbi__get32le(s); // discard data offset
+ sz = stbi__get32le(s);
+ r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124);
+ return r;
}
static int stbi__bmp_test(stbi__context *s)
{
- int r = stbi__bmp_test_raw(s);
- stbi__rewind(s);
- return r;
+ int r = stbi__bmp_test_raw(s);
+ stbi__rewind(s);
+ return r;
}
-
// returns 0..31 for the highest set bit
static int stbi__high_bit(unsigned int z)
{
- int n=0;
- if (z == 0) return -1;
- if (z >= 0x10000) n += 16, z >>= 16;
- if (z >= 0x00100) n += 8, z >>= 8;
- if (z >= 0x00010) n += 4, z >>= 4;
- if (z >= 0x00004) n += 2, z >>= 2;
- if (z >= 0x00002) n += 1, z >>= 1;
- return n;
+ int n = 0;
+ if (z == 0)
+ return -1;
+ if (z >= 0x10000)
+ n += 16, z >>= 16;
+ if (z >= 0x00100)
+ n += 8, z >>= 8;
+ if (z >= 0x00010)
+ n += 4, z >>= 4;
+ if (z >= 0x00004)
+ n += 2, z >>= 2;
+ if (z >= 0x00002)
+ n += 1, z >>= 1;
+ return n;
}
static int stbi__bitcount(unsigned int a)
{
- a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2
- a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4
- a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits
- a = (a + (a >> 8)); // max 16 per 8 bits
- a = (a + (a >> 16)); // max 32 per 8 bits
- return a & 0xff;
+ a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2
+ a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4
+ a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits
+ a = (a + (a >> 8)); // max 16 per 8 bits
+ a = (a + (a >> 16)); // max 32 per 8 bits
+ return a & 0xff;
}
static int stbi__shiftsigned(int v, int shift, int bits)
{
- int result;
- int z=0;
-
- if (shift < 0) v <<= -shift;
- else v >>= shift;
- result = v;
-
- z = bits;
- while (z < 8) {
- result += v >> z;
- z += bits;
- }
- return result;
+ int result;
+ int z = 0;
+
+ if (shift < 0)
+ v <<= -shift;
+ else
+ v >>= shift;
+ result = v;
+
+ z = bits;
+ while (z < 8) {
+ result += v >> z;
+ z += bits;
+ }
+ return result;
}
-typedef struct
-{
- int bpp, offset, hsz;
- unsigned int mr,mg,mb,ma, all_a;
+typedef struct {
+ int bpp, offset, hsz;
+ unsigned int mr, mg, mb, ma, all_a;
} stbi__bmp_data;
static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info)
{
- int hsz;
- if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP");
- stbi__get32le(s); // discard filesize
- stbi__get16le(s); // discard reserved
- stbi__get16le(s); // discard reserved
- info->offset = stbi__get32le(s);
- info->hsz = hsz = stbi__get32le(s);
- info->mr = info->mg = info->mb = info->ma = 0;
-
- if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown");
- if (hsz == 12) {
- s->img_x = stbi__get16le(s);
- s->img_y = stbi__get16le(s);
- } else {
- s->img_x = stbi__get32le(s);
- s->img_y = stbi__get32le(s);
- }
- if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP");
- info->bpp = stbi__get16le(s);
- if (info->bpp == 1) return stbi__errpuc("monochrome", "BMP type not supported: 1-bit");
- if (hsz != 12) {
- int compress = stbi__get32le(s);
- if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE");
- stbi__get32le(s); // discard sizeof
- stbi__get32le(s); // discard hres
- stbi__get32le(s); // discard vres
- stbi__get32le(s); // discard colorsused
- stbi__get32le(s); // discard max important
- if (hsz == 40 || hsz == 56) {
- if (hsz == 56) {
- stbi__get32le(s);
- stbi__get32le(s);
- stbi__get32le(s);
- stbi__get32le(s);
- }
- if (info->bpp == 16 || info->bpp == 32) {
- if (compress == 0) {
- if (info->bpp == 32) {
- info->mr = 0xffu << 16;
- info->mg = 0xffu << 8;
- info->mb = 0xffu << 0;
- info->ma = 0xffu << 24;
- info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0
- } else {
- info->mr = 31u << 10;
- info->mg = 31u << 5;
- info->mb = 31u << 0;
- }
- } else if (compress == 3) {
- info->mr = stbi__get32le(s);
- info->mg = stbi__get32le(s);
- info->mb = stbi__get32le(s);
- // not documented, but generated by photoshop and handled by mspaint
- if (info->mr == info->mg && info->mg == info->mb) {
- // ?!?!?
- return stbi__errpuc("bad BMP", "bad BMP");
- }
- } else
- return stbi__errpuc("bad BMP", "bad BMP");
- }
- } else {
- int i;
- if (hsz != 108 && hsz != 124)
- return stbi__errpuc("bad BMP", "bad BMP");
- info->mr = stbi__get32le(s);
- info->mg = stbi__get32le(s);
- info->mb = stbi__get32le(s);
- info->ma = stbi__get32le(s);
- stbi__get32le(s); // discard color space
- for (i=0; i < 12; ++i)
- stbi__get32le(s); // discard color space parameters
- if (hsz == 124) {
- stbi__get32le(s); // discard rendering intent
- stbi__get32le(s); // discard offset of profile data
- stbi__get32le(s); // discard size of profile data
- stbi__get32le(s); // discard reserved
- }
- }
- }
- return (void *) 1;
-}
-
-
-static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
-{
- stbi_uc *out;
- unsigned int mr=0,mg=0,mb=0,ma=0, all_a;
- stbi_uc pal[256][4];
- int psize=0,i,j,width;
- int flip_vertically, pad, target;
- stbi__bmp_data info;
- STBI_NOTUSED(ri);
-
- info.all_a = 255;
- if (stbi__bmp_parse_header(s, &info) == NULL)
- return NULL; // error code already set
-
- flip_vertically = ((int) s->img_y) > 0;
- s->img_y = abs((int) s->img_y);
-
- mr = info.mr;
- mg = info.mg;
- mb = info.mb;
- ma = info.ma;
- all_a = info.all_a;
-
- if (info.hsz == 12) {
- if (info.bpp < 24)
- psize = (info.offset - 14 - 24) / 3;
- } else {
- if (info.bpp < 16)
- psize = (info.offset - 14 - info.hsz) >> 2;
- }
-
- s->img_n = ma ? 4 : 3;
- if (req_comp && req_comp >= 3) // we can directly decode 3 or 4
- target = req_comp;
- else
- target = s->img_n; // if they want monochrome, we'll post-convert
-
- // sanity-check size
- if (!stbi__mad3sizes_valid(target, s->img_x, s->img_y, 0))
- return stbi__errpuc("too large", "Corrupt BMP");
-
- out = (stbi_uc *) stbi__malloc_mad3(target, s->img_x, s->img_y, 0);
- if (!out) return stbi__errpuc("outofmem", "Out of memory");
- if (info.bpp < 16) {
- int z=0;
- if (psize == 0 || psize > 256) { STBI_FREE(out); return stbi__errpuc("invalid", "Corrupt BMP"); }
- for (i=0; i < psize; ++i) {
- pal[i][2] = stbi__get8(s);
- pal[i][1] = stbi__get8(s);
- pal[i][0] = stbi__get8(s);
- if (info.hsz != 12) stbi__get8(s);
- pal[i][3] = 255;
- }
- stbi__skip(s, info.offset - 14 - info.hsz - psize * (info.hsz == 12 ? 3 : 4));
- if (info.bpp == 4) width = (s->img_x + 1) >> 1;
- else if (info.bpp == 8) width = s->img_x;
- else { STBI_FREE(out); return stbi__errpuc("bad bpp", "Corrupt BMP"); }
- pad = (-width)&3;
- for (j=0; j < (int) s->img_y; ++j) {
- for (i=0; i < (int) s->img_x; i += 2) {
- int v=stbi__get8(s),v2=0;
- if (info.bpp == 4) {
- v2 = v & 15;
- v >>= 4;
+ int hsz;
+ if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M')
+ return stbi__errpuc("not BMP", "Corrupt BMP");
+ stbi__get32le(s); // discard filesize
+ stbi__get16le(s); // discard reserved
+ stbi__get16le(s); // discard reserved
+ info->offset = stbi__get32le(s);
+ info->hsz = hsz = stbi__get32le(s);
+ info->mr = info->mg = info->mb = info->ma = 0;
+
+ if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124)
+ return stbi__errpuc("unknown BMP", "BMP type not supported: unknown");
+ if (hsz == 12) {
+ s->img_x = stbi__get16le(s);
+ s->img_y = stbi__get16le(s);
+ } else {
+ s->img_x = stbi__get32le(s);
+ s->img_y = stbi__get32le(s);
+ }
+ if (stbi__get16le(s) != 1)
+ return stbi__errpuc("bad BMP", "bad BMP");
+ info->bpp = stbi__get16le(s);
+ if (info->bpp == 1)
+ return stbi__errpuc("monochrome", "BMP type not supported: 1-bit");
+ if (hsz != 12) {
+ int compress = stbi__get32le(s);
+ if (compress == 1 || compress == 2)
+ return stbi__errpuc("BMP RLE", "BMP type not supported: RLE");
+ stbi__get32le(s); // discard sizeof
+ stbi__get32le(s); // discard hres
+ stbi__get32le(s); // discard vres
+ stbi__get32le(s); // discard colorsused
+ stbi__get32le(s); // discard max important
+ if (hsz == 40 || hsz == 56) {
+ if (hsz == 56) {
+ stbi__get32le(s);
+ stbi__get32le(s);
+ stbi__get32le(s);
+ stbi__get32le(s);
+ }
+ if (info->bpp == 16 || info->bpp == 32) {
+ if (compress == 0) {
+ if (info->bpp == 32) {
+ info->mr = 0xffu << 16;
+ info->mg = 0xffu << 8;
+ info->mb = 0xffu << 0;
+ info->ma = 0xffu << 24;
+ info->all_a = 0; // if all_a is 0 at end, then we loaded
+ // alpha channel but it was all 0
+ } else {
+ info->mr = 31u << 10;
+ info->mg = 31u << 5;
+ info->mb = 31u << 0;
+ }
+ } else if (compress == 3) {
+ info->mr = stbi__get32le(s);
+ info->mg = stbi__get32le(s);
+ info->mb = stbi__get32le(s);
+ // not documented, but generated by photoshop and handled by
+ // mspaint
+ if (info->mr == info->mg && info->mg == info->mb) {
+ // ?!?!?
+ return stbi__errpuc("bad BMP", "bad BMP");
+ }
+ } else
+ return stbi__errpuc("bad BMP", "bad BMP");
+ }
+ } else {
+ int i;
+ if (hsz != 108 && hsz != 124)
+ return stbi__errpuc("bad BMP", "bad BMP");
+ info->mr = stbi__get32le(s);
+ info->mg = stbi__get32le(s);
+ info->mb = stbi__get32le(s);
+ info->ma = stbi__get32le(s);
+ stbi__get32le(s); // discard color space
+ for (i = 0; i < 12; ++i)
+ stbi__get32le(s); // discard color space parameters
+ if (hsz == 124) {
+ stbi__get32le(s); // discard rendering intent
+ stbi__get32le(s); // discard offset of profile data
+ stbi__get32le(s); // discard size of profile data
+ stbi__get32le(s); // discard reserved
+ }
+ }
+ }
+ return (void *)1;
+}
+
+static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri)
+{
+ stbi_uc *out;
+ unsigned int mr = 0, mg = 0, mb = 0, ma = 0, all_a;
+ stbi_uc pal[256][4];
+ int psize = 0, i, j, width;
+ int flip_vertically, pad, target;
+ stbi__bmp_data info;
+ STBI_NOTUSED(ri);
+
+ info.all_a = 255;
+ if (stbi__bmp_parse_header(s, &info) == NULL)
+ return NULL; // error code already set
+
+ flip_vertically = ((int)s->img_y) > 0;
+ s->img_y = abs((int)s->img_y);
+
+ mr = info.mr;
+ mg = info.mg;
+ mb = info.mb;
+ ma = info.ma;
+ all_a = info.all_a;
+
+ if (info.hsz == 12) {
+ if (info.bpp < 24)
+ psize = (info.offset - 14 - 24) / 3;
+ } else {
+ if (info.bpp < 16)
+ psize = (info.offset - 14 - info.hsz) >> 2;
+ }
+
+ s->img_n = ma ? 4 : 3;
+ if (req_comp && req_comp >= 3) // we can directly decode 3 or 4
+ target = req_comp;
+ else
+ target = s->img_n; // if they want monochrome, we'll post-convert
+
+ // sanity-check size
+ if (!stbi__mad3sizes_valid(target, s->img_x, s->img_y, 0))
+ return stbi__errpuc("too large", "Corrupt BMP");
+
+ out = (stbi_uc *)stbi__malloc_mad3(target, s->img_x, s->img_y, 0);
+ if (!out)
+ return stbi__errpuc("outofmem", "Out of memory");
+ if (info.bpp < 16) {
+ int z = 0;
+ if (psize == 0 || psize > 256) {
+ STBI_FREE(out);
+ return stbi__errpuc("invalid", "Corrupt BMP");
+ }
+ for (i = 0; i < psize; ++i) {
+ pal[i][2] = stbi__get8(s);
+ pal[i][1] = stbi__get8(s);
+ pal[i][0] = stbi__get8(s);
+ if (info.hsz != 12)
+ stbi__get8(s);
+ pal[i][3] = 255;
+ }
+ stbi__skip(s, info.offset - 14 - info.hsz -
+ psize * (info.hsz == 12 ? 3 : 4));
+ if (info.bpp == 4)
+ width = (s->img_x + 1) >> 1;
+ else if (info.bpp == 8)
+ width = s->img_x;
+ else {
+ STBI_FREE(out);
+ return stbi__errpuc("bad bpp", "Corrupt BMP");
+ }
+ pad = (-width) & 3;
+ for (j = 0; j < (int)s->img_y; ++j) {
+ for (i = 0; i < (int)s->img_x; i += 2) {
+ int v = stbi__get8(s), v2 = 0;
+ if (info.bpp == 4) {
+ v2 = v & 15;
+ v >>= 4;
+ }
+ out[z++] = pal[v][0];
+ out[z++] = pal[v][1];
+ out[z++] = pal[v][2];
+ if (target == 4)
+ out[z++] = 255;
+ if (i + 1 == (int)s->img_x)
+ break;
+ v = (info.bpp == 8) ? stbi__get8(s) : v2;
+ out[z++] = pal[v][0];
+ out[z++] = pal[v][1];
+ out[z++] = pal[v][2];
+ if (target == 4)
+ out[z++] = 255;
}
- out[z++] = pal[v][0];
- out[z++] = pal[v][1];
- out[z++] = pal[v][2];
- if (target == 4) out[z++] = 255;
- if (i+1 == (int) s->img_x) break;
- v = (info.bpp == 8) ? stbi__get8(s) : v2;
- out[z++] = pal[v][0];
- out[z++] = pal[v][1];
- out[z++] = pal[v][2];
- if (target == 4) out[z++] = 255;
- }
- stbi__skip(s, pad);
- }
- } else {
- int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0;
- int z = 0;
- int easy=0;
- stbi__skip(s, info.offset - 14 - info.hsz);
- if (info.bpp == 24) width = 3 * s->img_x;
- else if (info.bpp == 16) width = 2*s->img_x;
- else /* bpp = 32 and pad = 0 */ width=0;
- pad = (-width) & 3;
- if (info.bpp == 24) {
- easy = 1;
- } else if (info.bpp == 32) {
- if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000)
- easy = 2;
- }
- if (!easy) {
- if (!mr || !mg || !mb) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); }
- // right shift amt to put high bit in position #7
- rshift = stbi__high_bit(mr)-7; rcount = stbi__bitcount(mr);
- gshift = stbi__high_bit(mg)-7; gcount = stbi__bitcount(mg);
- bshift = stbi__high_bit(mb)-7; bcount = stbi__bitcount(mb);
- ashift = stbi__high_bit(ma)-7; acount = stbi__bitcount(ma);
- }
- for (j=0; j < (int) s->img_y; ++j) {
- if (easy) {
- for (i=0; i < (int) s->img_x; ++i) {
- unsigned char a;
- out[z+2] = stbi__get8(s);
- out[z+1] = stbi__get8(s);
- out[z+0] = stbi__get8(s);
- z += 3;
- a = (easy == 2 ? stbi__get8(s) : 255);
- all_a |= a;
- if (target == 4) out[z++] = a;
+ stbi__skip(s, pad);
+ }
+ } else {
+ int rshift = 0, gshift = 0, bshift = 0, ashift = 0, rcount = 0,
+ gcount = 0, bcount = 0, acount = 0;
+ int z = 0;
+ int easy = 0;
+ stbi__skip(s, info.offset - 14 - info.hsz);
+ if (info.bpp == 24)
+ width = 3 * s->img_x;
+ else if (info.bpp == 16)
+ width = 2 * s->img_x;
+ else /* bpp = 32 and pad = 0 */
+ width = 0;
+ pad = (-width) & 3;
+ if (info.bpp == 24) {
+ easy = 1;
+ } else if (info.bpp == 32) {
+ if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 &&
+ ma == 0xff000000)
+ easy = 2;
+ }
+ if (!easy) {
+ if (!mr || !mg || !mb) {
+ STBI_FREE(out);
+ return stbi__errpuc("bad masks", "Corrupt BMP");
}
- } else {
- int bpp = info.bpp;
- for (i=0; i < (int) s->img_x; ++i) {
- stbi__uint32 v = (bpp == 16 ? (stbi__uint32) stbi__get16le(s) : stbi__get32le(s));
- int a;
- out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount));
- out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount));
- out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount));
- a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255);
- all_a |= a;
- if (target == 4) out[z++] = STBI__BYTECAST(a);
+ // right shift amt to put high bit in position #7
+ rshift = stbi__high_bit(mr) - 7;
+ rcount = stbi__bitcount(mr);
+ gshift = stbi__high_bit(mg) - 7;
+ gcount = stbi__bitcount(mg);
+ bshift = stbi__high_bit(mb) - 7;
+ bcount = stbi__bitcount(mb);
+ ashift = stbi__high_bit(ma) - 7;
+ acount = stbi__bitcount(ma);
+ }
+ for (j = 0; j < (int)s->img_y; ++j) {
+ if (easy) {
+ for (i = 0; i < (int)s->img_x; ++i) {
+ unsigned char a;
+ out[z + 2] = stbi__get8(s);
+ out[z + 1] = stbi__get8(s);
+ out[z + 0] = stbi__get8(s);
+ z += 3;
+ a = (easy == 2 ? stbi__get8(s) : 255);
+ all_a |= a;
+ if (target == 4)
+ out[z++] = a;
+ }
+ } else {
+ int bpp = info.bpp;
+ for (i = 0; i < (int)s->img_x; ++i) {
+ stbi__uint32 v = (bpp == 16 ? (stbi__uint32)stbi__get16le(s)
+ : stbi__get32le(s));
+ int a;
+ out[z++] = STBI__BYTECAST(
+ stbi__shiftsigned(v & mr, rshift, rcount));
+ out[z++] = STBI__BYTECAST(
+ stbi__shiftsigned(v & mg, gshift, gcount));
+ out[z++] = STBI__BYTECAST(
+ stbi__shiftsigned(v & mb, bshift, bcount));
+ a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255);
+ all_a |= a;
+ if (target == 4)
+ out[z++] = STBI__BYTECAST(a);
+ }
}
- }
- stbi__skip(s, pad);
- }
- }
-
- // if alpha channel is all 0s, replace with all 255s
- if (target == 4 && all_a == 0)
- for (i=4*s->img_x*s->img_y-1; i >= 0; i -= 4)
- out[i] = 255;
-
- if (flip_vertically) {
- stbi_uc t;
- for (j=0; j < (int) s->img_y>>1; ++j) {
- stbi_uc *p1 = out + j *s->img_x*target;
- stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target;
- for (i=0; i < (int) s->img_x*target; ++i) {
- t = p1[i], p1[i] = p2[i], p2[i] = t;
- }
- }
- }
-
- if (req_comp && req_comp != target) {
- out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y);
- if (out == NULL) return out; // stbi__convert_format frees input on failure
- }
-
- *x = s->img_x;
- *y = s->img_y;
- if (comp) *comp = s->img_n;
- return out;
+ stbi__skip(s, pad);
+ }
+ }
+
+ // if alpha channel is all 0s, replace with all 255s
+ if (target == 4 && all_a == 0)
+ for (i = 4 * s->img_x * s->img_y - 1; i >= 0; i -= 4)
+ out[i] = 255;
+
+ if (flip_vertically) {
+ stbi_uc t;
+ for (j = 0; j<(int)s->img_y>> 1; ++j) {
+ stbi_uc *p1 = out + j * s->img_x * target;
+ stbi_uc *p2 = out + (s->img_y - 1 - j) * s->img_x * target;
+ for (i = 0; i < (int)s->img_x * target; ++i) {
+ t = p1[i], p1[i] = p2[i], p2[i] = t;
+ }
+ }
+ }
+
+ if (req_comp && req_comp != target) {
+ out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y);
+ if (out == NULL)
+ return out; // stbi__convert_format frees input on failure
+ }
+
+ *x = s->img_x;
+ *y = s->img_y;
+ if (comp)
+ *comp = s->img_n;
+ return out;
}
#endif
@@ -5233,1064 +6090,1146 @@ static void *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req
// by Jonathan Dummer
#ifndef STBI_NO_TGA
// returns STBI_rgb or whatever, 0 on error
-static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_rgb16)
-{
- // only RGB or RGBA (incl. 16bit) or grey allowed
- if(is_rgb16) *is_rgb16 = 0;
- switch(bits_per_pixel) {
- case 8: return STBI_grey;
- case 16: if(is_grey) return STBI_grey_alpha;
- // else: fall-through
- case 15: if(is_rgb16) *is_rgb16 = 1;
- return STBI_rgb;
- case 24: // fall-through
- case 32: return bits_per_pixel/8;
- default: return 0;
- }
+static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int *is_rgb16)
+{
+ // only RGB or RGBA (incl. 16bit) or grey allowed
+ if (is_rgb16)
+ *is_rgb16 = 0;
+ switch (bits_per_pixel) {
+ case 8:
+ return STBI_grey;
+ case 16:
+ if (is_grey)
+ return STBI_grey_alpha;
+ // else: fall-through
+ case 15:
+ if (is_rgb16)
+ *is_rgb16 = 1;
+ return STBI_rgb;
+ case 24: // fall-through
+ case 32:
+ return bits_per_pixel / 8;
+ default:
+ return 0;
+ }
}
static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp)
{
- int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp;
+ int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel,
+ tga_colormap_bpp;
int sz, tga_colormap_type;
- stbi__get8(s); // discard Offset
+ stbi__get8(s); // discard Offset
tga_colormap_type = stbi__get8(s); // colormap type
- if( tga_colormap_type > 1 ) {
+ if (tga_colormap_type > 1) {
stbi__rewind(s);
- return 0; // only RGB or indexed allowed
+ return 0; // only RGB or indexed allowed
}
tga_image_type = stbi__get8(s); // image type
- if ( tga_colormap_type == 1 ) { // colormapped (paletted) image
+ if (tga_colormap_type == 1) { // colormapped (paletted) image
if (tga_image_type != 1 && tga_image_type != 9) {
stbi__rewind(s);
return 0;
}
- stbi__skip(s,4); // skip index of first colormap entry and number of entries
- sz = stbi__get8(s); // check bits per palette color entry
- if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) {
+ stbi__skip(
+ s, 4); // skip index of first colormap entry and number of entries
+ sz = stbi__get8(s); // check bits per palette color entry
+ if ((sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32)) {
stbi__rewind(s);
return 0;
}
- stbi__skip(s,4); // skip image x and y origin
+ stbi__skip(s, 4); // skip image x and y origin
tga_colormap_bpp = sz;
} else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE
- if ( (tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) && (tga_image_type != 11) ) {
+ if ((tga_image_type != 2) && (tga_image_type != 3) &&
+ (tga_image_type != 10) && (tga_image_type != 11)) {
stbi__rewind(s);
return 0; // only RGB or grey allowed, +/- RLE
}
- stbi__skip(s,9); // skip colormap specification and image x/y origin
+ stbi__skip(s, 9); // skip colormap specification and image x/y origin
tga_colormap_bpp = 0;
}
tga_w = stbi__get16le(s);
- if( tga_w < 1 ) {
+ if (tga_w < 1) {
stbi__rewind(s);
- return 0; // test width
+ return 0; // test width
}
tga_h = stbi__get16le(s);
- if( tga_h < 1 ) {
+ if (tga_h < 1) {
stbi__rewind(s);
- return 0; // test height
+ return 0; // test height
}
tga_bits_per_pixel = stbi__get8(s); // bits per pixel
- stbi__get8(s); // ignore alpha bits
+ stbi__get8(s); // ignore alpha bits
if (tga_colormap_bpp != 0) {
- if((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) {
- // when using a colormap, tga_bits_per_pixel is the size of the indexes
- // I don't think anything but 8 or 16bit indexes makes sense
+ if ((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) {
+ // when using a colormap, tga_bits_per_pixel is the size of the
+ // indexes I don't think anything but 8 or 16bit indexes makes sense
stbi__rewind(s);
return 0;
}
tga_comp = stbi__tga_get_comp(tga_colormap_bpp, 0, NULL);
} else {
- tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11), NULL);
+ tga_comp = stbi__tga_get_comp(
+ tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11),
+ NULL);
}
- if(!tga_comp) {
- stbi__rewind(s);
- return 0;
+ if (!tga_comp) {
+ stbi__rewind(s);
+ return 0;
}
- if (x) *x = tga_w;
- if (y) *y = tga_h;
- if (comp) *comp = tga_comp;
- return 1; // seems to have passed everything
+ if (x)
+ *x = tga_w;
+ if (y)
+ *y = tga_h;
+ if (comp)
+ *comp = tga_comp;
+ return 1; // seems to have passed everything
}
static int stbi__tga_test(stbi__context *s)
{
- int res = 0;
- int sz, tga_color_type;
- stbi__get8(s); // discard Offset
- tga_color_type = stbi__get8(s); // color type
- if ( tga_color_type > 1 ) goto errorEnd; // only RGB or indexed allowed
- sz = stbi__get8(s); // image type
- if ( tga_color_type == 1 ) { // colormapped (paletted) image
- if (sz != 1 && sz != 9) goto errorEnd; // colortype 1 demands image type 1 or 9
- stbi__skip(s,4); // skip index of first colormap entry and number of entries
- sz = stbi__get8(s); // check bits per palette color entry
- if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd;
- stbi__skip(s,4); // skip image x and y origin
- } else { // "normal" image w/o colormap
- if ( (sz != 2) && (sz != 3) && (sz != 10) && (sz != 11) ) goto errorEnd; // only RGB or grey allowed, +/- RLE
- stbi__skip(s,9); // skip colormap specification and image x/y origin
- }
- if ( stbi__get16le(s) < 1 ) goto errorEnd; // test width
- if ( stbi__get16le(s) < 1 ) goto errorEnd; // test height
- sz = stbi__get8(s); // bits per pixel
- if ( (tga_color_type == 1) && (sz != 8) && (sz != 16) ) goto errorEnd; // for colormapped images, bpp is size of an index
- if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd;
-
- res = 1; // if we got this far, everything's good and we can return 1 instead of 0
+ int res = 0;
+ int sz, tga_color_type;
+ stbi__get8(s); // discard Offset
+ tga_color_type = stbi__get8(s); // color type
+ if (tga_color_type > 1)
+ goto errorEnd; // only RGB or indexed allowed
+ sz = stbi__get8(s); // image type
+ if (tga_color_type == 1) { // colormapped (paletted) image
+ if (sz != 1 && sz != 9)
+ goto errorEnd; // colortype 1 demands image type 1 or 9
+ stbi__skip(
+ s, 4); // skip index of first colormap entry and number of entries
+ sz = stbi__get8(s); // check bits per palette color entry
+ if ((sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32))
+ goto errorEnd;
+ stbi__skip(s, 4); // skip image x and y origin
+ } else { // "normal" image w/o colormap
+ if ((sz != 2) && (sz != 3) && (sz != 10) && (sz != 11))
+ goto errorEnd; // only RGB or grey allowed, +/- RLE
+ stbi__skip(s, 9); // skip colormap specification and image x/y origin
+ }
+ if (stbi__get16le(s) < 1)
+ goto errorEnd; // test width
+ if (stbi__get16le(s) < 1)
+ goto errorEnd; // test height
+ sz = stbi__get8(s); // bits per pixel
+ if ((tga_color_type == 1) && (sz != 8) && (sz != 16))
+ goto errorEnd; // for colormapped images, bpp is size of an index
+ if ((sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32))
+ goto errorEnd;
+
+ res = 1; // if we got this far, everything's good and we can return 1
+ // instead of 0
errorEnd:
- stbi__rewind(s);
- return res;
+ stbi__rewind(s);
+ return res;
}
// read 16bit value and convert to 24bit RGB
-static void stbi__tga_read_rgb16(stbi__context *s, stbi_uc* out)
-{
- stbi__uint16 px = (stbi__uint16)stbi__get16le(s);
- stbi__uint16 fiveBitMask = 31;
- // we have 3 channels with 5bits each
- int r = (px >> 10) & fiveBitMask;
- int g = (px >> 5) & fiveBitMask;
- int b = px & fiveBitMask;
- // Note that this saves the data in RGB(A) order, so it doesn't need to be swapped later
- out[0] = (stbi_uc)((r * 255)/31);
- out[1] = (stbi_uc)((g * 255)/31);
- out[2] = (stbi_uc)((b * 255)/31);
-
- // some people claim that the most significant bit might be used for alpha
- // (possibly if an alpha-bit is set in the "image descriptor byte")
- // but that only made 16bit test images completely translucent..
- // so let's treat all 15 and 16bit TGAs as RGB with no alpha.
-}
-
-static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
-{
- // read in the TGA header stuff
- int tga_offset = stbi__get8(s);
- int tga_indexed = stbi__get8(s);
- int tga_image_type = stbi__get8(s);
- int tga_is_RLE = 0;
- int tga_palette_start = stbi__get16le(s);
- int tga_palette_len = stbi__get16le(s);
- int tga_palette_bits = stbi__get8(s);
- int tga_x_origin = stbi__get16le(s);
- int tga_y_origin = stbi__get16le(s);
- int tga_width = stbi__get16le(s);
- int tga_height = stbi__get16le(s);
- int tga_bits_per_pixel = stbi__get8(s);
- int tga_comp, tga_rgb16=0;
- int tga_inverted = stbi__get8(s);
- // int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused (useless?)
- // image data
- unsigned char *tga_data;
- unsigned char *tga_palette = NULL;
- int i, j;
- unsigned char raw_data[4] = {0};
- int RLE_count = 0;
- int RLE_repeating = 0;
- int read_next_pixel = 1;
- STBI_NOTUSED(ri);
-
- // do a tiny bit of precessing
- if ( tga_image_type >= 8 )
- {
- tga_image_type -= 8;
- tga_is_RLE = 1;
- }
- tga_inverted = 1 - ((tga_inverted >> 5) & 1);
-
- // If I'm paletted, then I'll use the number of bits from the palette
- if ( tga_indexed ) tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16);
- else tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3), &tga_rgb16);
-
- if(!tga_comp) // shouldn't really happen, stbi__tga_test() should have ensured basic consistency
- return stbi__errpuc("bad format", "Can't find out TGA pixelformat");
-
- // tga info
- *x = tga_width;
- *y = tga_height;
- if (comp) *comp = tga_comp;
-
- if (!stbi__mad3sizes_valid(tga_width, tga_height, tga_comp, 0))
- return stbi__errpuc("too large", "Corrupt TGA");
-
- tga_data = (unsigned char*)stbi__malloc_mad3(tga_width, tga_height, tga_comp, 0);
- if (!tga_data) return stbi__errpuc("outofmem", "Out of memory");
-
- // skip to the data's starting position (offset usually = 0)
- stbi__skip(s, tga_offset );
-
- if ( !tga_indexed && !tga_is_RLE && !tga_rgb16 ) {
- for (i=0; i < tga_height; ++i) {
- int row = tga_inverted ? tga_height -i - 1 : i;
- stbi_uc *tga_row = tga_data + row*tga_width*tga_comp;
- stbi__getn(s, tga_row, tga_width * tga_comp);
- }
- } else {
- // do I need to load a palette?
- if ( tga_indexed)
- {
- // any data to skip? (offset usually = 0)
- stbi__skip(s, tga_palette_start );
- // load the palette
- tga_palette = (unsigned char*)stbi__malloc_mad2(tga_palette_len, tga_comp, 0);
- if (!tga_palette) {
- STBI_FREE(tga_data);
- return stbi__errpuc("outofmem", "Out of memory");
- }
- if (tga_rgb16) {
- stbi_uc *pal_entry = tga_palette;
- STBI_ASSERT(tga_comp == STBI_rgb);
- for (i=0; i < tga_palette_len; ++i) {
- stbi__tga_read_rgb16(s, pal_entry);
- pal_entry += tga_comp;
+static void stbi__tga_read_rgb16(stbi__context *s, stbi_uc *out)
+{
+ stbi__uint16 px = (stbi__uint16)stbi__get16le(s);
+ stbi__uint16 fiveBitMask = 31;
+ // we have 3 channels with 5bits each
+ int r = (px >> 10) & fiveBitMask;
+ int g = (px >> 5) & fiveBitMask;
+ int b = px & fiveBitMask;
+ // Note that this saves the data in RGB(A) order, so it doesn't need to be
+ // swapped later
+ out[0] = (stbi_uc)((r * 255) / 31);
+ out[1] = (stbi_uc)((g * 255) / 31);
+ out[2] = (stbi_uc)((b * 255) / 31);
+
+ // some people claim that the most significant bit might be used for alpha
+ // (possibly if an alpha-bit is set in the "image descriptor byte")
+ // but that only made 16bit test images completely translucent..
+ // so let's treat all 15 and 16bit TGAs as RGB with no alpha.
+}
+
+static void *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri)
+{
+ // read in the TGA header stuff
+ int tga_offset = stbi__get8(s);
+ int tga_indexed = stbi__get8(s);
+ int tga_image_type = stbi__get8(s);
+ int tga_is_RLE = 0;
+ int tga_palette_start = stbi__get16le(s);
+ int tga_palette_len = stbi__get16le(s);
+ int tga_palette_bits = stbi__get8(s);
+ int tga_x_origin = stbi__get16le(s);
+ int tga_y_origin = stbi__get16le(s);
+ int tga_width = stbi__get16le(s);
+ int tga_height = stbi__get16le(s);
+ int tga_bits_per_pixel = stbi__get8(s);
+ int tga_comp, tga_rgb16 = 0;
+ int tga_inverted = stbi__get8(s);
+ // int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused
+ // (useless?)
+ // image data
+ unsigned char *tga_data;
+ unsigned char *tga_palette = NULL;
+ int i, j;
+ unsigned char raw_data[4] = {0};
+ int RLE_count = 0;
+ int RLE_repeating = 0;
+ int read_next_pixel = 1;
+ STBI_NOTUSED(ri);
+
+ // do a tiny bit of precessing
+ if (tga_image_type >= 8) {
+ tga_image_type -= 8;
+ tga_is_RLE = 1;
+ }
+ tga_inverted = 1 - ((tga_inverted >> 5) & 1);
+
+ // If I'm paletted, then I'll use the number of bits from the palette
+ if (tga_indexed)
+ tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16);
+ else
+ tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3),
+ &tga_rgb16);
+
+ if (!tga_comp) // shouldn't really happen, stbi__tga_test() should have
+ // ensured basic consistency
+ return stbi__errpuc("bad format", "Can't find out TGA pixelformat");
+
+ // tga info
+ *x = tga_width;
+ *y = tga_height;
+ if (comp)
+ *comp = tga_comp;
+
+ if (!stbi__mad3sizes_valid(tga_width, tga_height, tga_comp, 0))
+ return stbi__errpuc("too large", "Corrupt TGA");
+
+ tga_data =
+ (unsigned char *)stbi__malloc_mad3(tga_width, tga_height, tga_comp, 0);
+ if (!tga_data)
+ return stbi__errpuc("outofmem", "Out of memory");
+
+ // skip to the data's starting position (offset usually = 0)
+ stbi__skip(s, tga_offset);
+
+ if (!tga_indexed && !tga_is_RLE && !tga_rgb16) {
+ for (i = 0; i < tga_height; ++i) {
+ int row = tga_inverted ? tga_height - i - 1 : i;
+ stbi_uc *tga_row = tga_data + row * tga_width * tga_comp;
+ stbi__getn(s, tga_row, tga_width * tga_comp);
+ }
+ } else {
+ // do I need to load a palette?
+ if (tga_indexed) {
+ // any data to skip? (offset usually = 0)
+ stbi__skip(s, tga_palette_start);
+ // load the palette
+ tga_palette = (unsigned char *)stbi__malloc_mad2(tga_palette_len,
+ tga_comp, 0);
+ if (!tga_palette) {
+ STBI_FREE(tga_data);
+ return stbi__errpuc("outofmem", "Out of memory");
}
- } else if (!stbi__getn(s, tga_palette, tga_palette_len * tga_comp)) {
- STBI_FREE(tga_data);
- STBI_FREE(tga_palette);
- return stbi__errpuc("bad palette", "Corrupt TGA");
- }
- }
- // load the data
- for (i=0; i < tga_width * tga_height; ++i)
- {
- // if I'm in RLE mode, do I need to get a RLE stbi__pngchunk?
- if ( tga_is_RLE )
- {
- if ( RLE_count == 0 )
- {
- // yep, get the next byte as a RLE command
- int RLE_cmd = stbi__get8(s);
- RLE_count = 1 + (RLE_cmd & 127);
- RLE_repeating = RLE_cmd >> 7;
- read_next_pixel = 1;
- } else if ( !RLE_repeating )
- {
- read_next_pixel = 1;
+ if (tga_rgb16) {
+ stbi_uc *pal_entry = tga_palette;
+ STBI_ASSERT(tga_comp == STBI_rgb);
+ for (i = 0; i < tga_palette_len; ++i) {
+ stbi__tga_read_rgb16(s, pal_entry);
+ pal_entry += tga_comp;
+ }
+ } else if (!stbi__getn(s, tga_palette,
+ tga_palette_len * tga_comp)) {
+ STBI_FREE(tga_data);
+ STBI_FREE(tga_palette);
+ return stbi__errpuc("bad palette", "Corrupt TGA");
}
- } else
- {
- read_next_pixel = 1;
- }
- // OK, if I need to read a pixel, do it now
- if ( read_next_pixel )
- {
- // load however much data we did have
- if ( tga_indexed )
- {
- // read in index, then perform the lookup
- int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s);
- if ( pal_idx >= tga_palette_len ) {
- // invalid index
- pal_idx = 0;
- }
- pal_idx *= tga_comp;
- for (j = 0; j < tga_comp; ++j) {
- raw_data[j] = tga_palette[pal_idx+j];
- }
- } else if(tga_rgb16) {
- STBI_ASSERT(tga_comp == STBI_rgb);
- stbi__tga_read_rgb16(s, raw_data);
+ }
+ // load the data
+ for (i = 0; i < tga_width * tga_height; ++i) {
+ // if I'm in RLE mode, do I need to get a RLE stbi__pngchunk?
+ if (tga_is_RLE) {
+ if (RLE_count == 0) {
+ // yep, get the next byte as a RLE command
+ int RLE_cmd = stbi__get8(s);
+ RLE_count = 1 + (RLE_cmd & 127);
+ RLE_repeating = RLE_cmd >> 7;
+ read_next_pixel = 1;
+ } else if (!RLE_repeating) {
+ read_next_pixel = 1;
+ }
} else {
- // read in the data raw
- for (j = 0; j < tga_comp; ++j) {
- raw_data[j] = stbi__get8(s);
- }
+ read_next_pixel = 1;
}
- // clear the reading flag for the next pixel
- read_next_pixel = 0;
- } // end of reading a pixel
-
- // copy data
- for (j = 0; j < tga_comp; ++j)
- tga_data[i*tga_comp+j] = raw_data[j];
-
- // in case we're in RLE mode, keep counting down
- --RLE_count;
- }
- // do I need to invert the image?
- if ( tga_inverted )
- {
- for (j = 0; j*2 < tga_height; ++j)
- {
- int index1 = j * tga_width * tga_comp;
- int index2 = (tga_height - 1 - j) * tga_width * tga_comp;
- for (i = tga_width * tga_comp; i > 0; --i)
- {
- unsigned char temp = tga_data[index1];
- tga_data[index1] = tga_data[index2];
- tga_data[index2] = temp;
- ++index1;
- ++index2;
+ // OK, if I need to read a pixel, do it now
+ if (read_next_pixel) {
+ // load however much data we did have
+ if (tga_indexed) {
+ // read in index, then perform the lookup
+ int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s)
+ : stbi__get16le(s);
+ if (pal_idx >= tga_palette_len) {
+ // invalid index
+ pal_idx = 0;
+ }
+ pal_idx *= tga_comp;
+ for (j = 0; j < tga_comp; ++j) {
+ raw_data[j] = tga_palette[pal_idx + j];
+ }
+ } else if (tga_rgb16) {
+ STBI_ASSERT(tga_comp == STBI_rgb);
+ stbi__tga_read_rgb16(s, raw_data);
+ } else {
+ // read in the data raw
+ for (j = 0; j < tga_comp; ++j) {
+ raw_data[j] = stbi__get8(s);
+ }
+ }
+ // clear the reading flag for the next pixel
+ read_next_pixel = 0;
+ } // end of reading a pixel
+
+ // copy data
+ for (j = 0; j < tga_comp; ++j)
+ tga_data[i * tga_comp + j] = raw_data[j];
+
+ // in case we're in RLE mode, keep counting down
+ --RLE_count;
+ }
+ // do I need to invert the image?
+ if (tga_inverted) {
+ for (j = 0; j * 2 < tga_height; ++j) {
+ int index1 = j * tga_width * tga_comp;
+ int index2 = (tga_height - 1 - j) * tga_width * tga_comp;
+ for (i = tga_width * tga_comp; i > 0; --i) {
+ unsigned char temp = tga_data[index1];
+ tga_data[index1] = tga_data[index2];
+ tga_data[index2] = temp;
+ ++index1;
+ ++index2;
+ }
}
- }
- }
- // clear my palette, if I had one
- if ( tga_palette != NULL )
- {
- STBI_FREE( tga_palette );
- }
- }
-
- // swap RGB - if the source data was RGB16, it already is in the right order
- if (tga_comp >= 3 && !tga_rgb16)
- {
- unsigned char* tga_pixel = tga_data;
- for (i=0; i < tga_width * tga_height; ++i)
- {
- unsigned char temp = tga_pixel[0];
- tga_pixel[0] = tga_pixel[2];
- tga_pixel[2] = temp;
- tga_pixel += tga_comp;
- }
- }
-
- // convert to target component count
- if (req_comp && req_comp != tga_comp)
- tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height);
-
- // the things I do to get rid of an error message, and yet keep
- // Microsoft's C compilers happy... [8^(
- tga_palette_start = tga_palette_len = tga_palette_bits =
- tga_x_origin = tga_y_origin = 0;
- // OK, done
- return tga_data;
+ }
+ // clear my palette, if I had one
+ if (tga_palette != NULL) {
+ STBI_FREE(tga_palette);
+ }
+ }
+
+ // swap RGB - if the source data was RGB16, it already is in the right order
+ if (tga_comp >= 3 && !tga_rgb16) {
+ unsigned char *tga_pixel = tga_data;
+ for (i = 0; i < tga_width * tga_height; ++i) {
+ unsigned char temp = tga_pixel[0];
+ tga_pixel[0] = tga_pixel[2];
+ tga_pixel[2] = temp;
+ tga_pixel += tga_comp;
+ }
+ }
+
+ // convert to target component count
+ if (req_comp && req_comp != tga_comp)
+ tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width,
+ tga_height);
+
+ // the things I do to get rid of an error message, and yet keep
+ // Microsoft's C compilers happy... [8^(
+ tga_palette_start = tga_palette_len = tga_palette_bits = tga_x_origin =
+ tga_y_origin = 0;
+ // OK, done
+ return tga_data;
}
#endif
-// *************************************************************************************************
-// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB
+ // *************************************************************************************************
+ // Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas
+ // Schulz, tweaked by STB
#ifndef STBI_NO_PSD
static int stbi__psd_test(stbi__context *s)
{
- int r = (stbi__get32be(s) == 0x38425053);
- stbi__rewind(s);
- return r;
+ int r = (stbi__get32be(s) == 0x38425053);
+ stbi__rewind(s);
+ return r;
}
static int stbi__psd_decode_rle(stbi__context *s, stbi_uc *p, int pixelCount)
{
- int count, nleft, len;
-
- count = 0;
- while ((nleft = pixelCount - count) > 0) {
- len = stbi__get8(s);
- if (len == 128) {
- // No-op.
- } else if (len < 128) {
- // Copy next len+1 bytes literally.
- len++;
- if (len > nleft) return 0; // corrupt data
- count += len;
- while (len) {
- *p = stbi__get8(s);
- p += 4;
- len--;
- }
- } else if (len > 128) {
- stbi_uc val;
- // Next -len+1 bytes in the dest are replicated from next source byte.
- // (Interpret len as a negative 8-bit int.)
- len = 257 - len;
- if (len > nleft) return 0; // corrupt data
- val = stbi__get8(s);
- count += len;
- while (len) {
- *p = val;
- p += 4;
- len--;
- }
- }
- }
-
- return 1;
-}
-
-static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri, int bpc)
-{
- int pixelCount;
- int channelCount, compression;
- int channel, i;
- int bitdepth;
- int w,h;
- stbi_uc *out;
- STBI_NOTUSED(ri);
-
- // Check identifier
- if (stbi__get32be(s) != 0x38425053) // "8BPS"
- return stbi__errpuc("not PSD", "Corrupt PSD image");
-
- // Check file type version.
- if (stbi__get16be(s) != 1)
- return stbi__errpuc("wrong version", "Unsupported version of PSD image");
-
- // Skip 6 reserved bytes.
- stbi__skip(s, 6 );
-
- // Read the number of channels (R, G, B, A, etc).
- channelCount = stbi__get16be(s);
- if (channelCount < 0 || channelCount > 16)
- return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image");
-
- // Read the rows and columns of the image.
- h = stbi__get32be(s);
- w = stbi__get32be(s);
-
- // Make sure the depth is 8 bits.
- bitdepth = stbi__get16be(s);
- if (bitdepth != 8 && bitdepth != 16)
- return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit");
-
- // Make sure the color mode is RGB.
- // Valid options are:
- // 0: Bitmap
- // 1: Grayscale
- // 2: Indexed color
- // 3: RGB color
- // 4: CMYK color
- // 7: Multichannel
- // 8: Duotone
- // 9: Lab color
- if (stbi__get16be(s) != 3)
- return stbi__errpuc("wrong color format", "PSD is not in RGB color format");
-
- // Skip the Mode Data. (It's the palette for indexed color; other info for other modes.)
- stbi__skip(s,stbi__get32be(s) );
-
- // Skip the image resources. (resolution, pen tool paths, etc)
- stbi__skip(s, stbi__get32be(s) );
-
- // Skip the reserved data.
- stbi__skip(s, stbi__get32be(s) );
-
- // Find out if the data is compressed.
- // Known values:
- // 0: no compression
- // 1: RLE compressed
- compression = stbi__get16be(s);
- if (compression > 1)
- return stbi__errpuc("bad compression", "PSD has an unknown compression format");
-
- // Check size
- if (!stbi__mad3sizes_valid(4, w, h, 0))
- return stbi__errpuc("too large", "Corrupt PSD");
-
- // Create the destination image.
-
- if (!compression && bitdepth == 16 && bpc == 16) {
- out = (stbi_uc *) stbi__malloc_mad3(8, w, h, 0);
- ri->bits_per_channel = 16;
- } else
- out = (stbi_uc *) stbi__malloc(4 * w*h);
-
- if (!out) return stbi__errpuc("outofmem", "Out of memory");
- pixelCount = w*h;
-
- // Initialize the data to zero.
- //memset( out, 0, pixelCount * 4 );
-
- // Finally, the image data.
- if (compression) {
- // RLE as used by .PSD and .TIFF
- // Loop until you get the number of unpacked bytes you are expecting:
- // Read the next source byte into n.
- // If n is between 0 and 127 inclusive, copy the next n+1 bytes literally.
- // Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times.
- // Else if n is 128, noop.
- // Endloop
-
- // The RLE-compressed data is preceeded by a 2-byte data count for each row in the data,
- // which we're going to just skip.
- stbi__skip(s, h * channelCount * 2 );
-
- // Read the RLE data by channel.
- for (channel = 0; channel < 4; channel++) {
- stbi_uc *p;
-
- p = out+channel;
- if (channel >= channelCount) {
- // Fill this channel with default data.
- for (i = 0; i < pixelCount; i++, p += 4)
- *p = (channel == 3 ? 255 : 0);
- } else {
- // Read the RLE data.
- if (!stbi__psd_decode_rle(s, p, pixelCount)) {
- STBI_FREE(out);
- return stbi__errpuc("corrupt", "bad RLE data");
+ int count, nleft, len;
+
+ count = 0;
+ while ((nleft = pixelCount - count) > 0) {
+ len = stbi__get8(s);
+ if (len == 128) {
+ // No-op.
+ } else if (len < 128) {
+ // Copy next len+1 bytes literally.
+ len++;
+ if (len > nleft)
+ return 0; // corrupt data
+ count += len;
+ while (len) {
+ *p = stbi__get8(s);
+ p += 4;
+ len--;
+ }
+ } else if (len > 128) {
+ stbi_uc val;
+ // Next -len+1 bytes in the dest are replicated from next source
+ // byte. (Interpret len as a negative 8-bit int.)
+ len = 257 - len;
+ if (len > nleft)
+ return 0; // corrupt data
+ val = stbi__get8(s);
+ count += len;
+ while (len) {
+ *p = val;
+ p += 4;
+ len--;
}
- }
- }
-
- } else {
- // We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...)
- // where each channel consists of an 8-bit (or 16-bit) value for each pixel in the image.
-
- // Read the data by channel.
- for (channel = 0; channel < 4; channel++) {
- if (channel >= channelCount) {
- // Fill this channel with default data.
- if (bitdepth == 16 && bpc == 16) {
- stbi__uint16 *q = ((stbi__uint16 *) out) + channel;
- stbi__uint16 val = channel == 3 ? 65535 : 0;
- for (i = 0; i < pixelCount; i++, q += 4)
- *q = val;
+ }
+ }
+
+ return 1;
+}
+
+static void *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri, int bpc)
+{
+ int pixelCount;
+ int channelCount, compression;
+ int channel, i;
+ int bitdepth;
+ int w, h;
+ stbi_uc *out;
+ STBI_NOTUSED(ri);
+
+ // Check identifier
+ if (stbi__get32be(s) != 0x38425053) // "8BPS"
+ return stbi__errpuc("not PSD", "Corrupt PSD image");
+
+ // Check file type version.
+ if (stbi__get16be(s) != 1)
+ return stbi__errpuc("wrong version",
+ "Unsupported version of PSD image");
+
+ // Skip 6 reserved bytes.
+ stbi__skip(s, 6);
+
+ // Read the number of channels (R, G, B, A, etc).
+ channelCount = stbi__get16be(s);
+ if (channelCount < 0 || channelCount > 16)
+ return stbi__errpuc("wrong channel count",
+ "Unsupported number of channels in PSD image");
+
+ // Read the rows and columns of the image.
+ h = stbi__get32be(s);
+ w = stbi__get32be(s);
+
+ // Make sure the depth is 8 bits.
+ bitdepth = stbi__get16be(s);
+ if (bitdepth != 8 && bitdepth != 16)
+ return stbi__errpuc("unsupported bit depth",
+ "PSD bit depth is not 8 or 16 bit");
+
+ // Make sure the color mode is RGB.
+ // Valid options are:
+ // 0: Bitmap
+ // 1: Grayscale
+ // 2: Indexed color
+ // 3: RGB color
+ // 4: CMYK color
+ // 7: Multichannel
+ // 8: Duotone
+ // 9: Lab color
+ if (stbi__get16be(s) != 3)
+ return stbi__errpuc("wrong color format",
+ "PSD is not in RGB color format");
+
+ // Skip the Mode Data. (It's the palette for indexed color; other info for
+ // other modes.)
+ stbi__skip(s, stbi__get32be(s));
+
+ // Skip the image resources. (resolution, pen tool paths, etc)
+ stbi__skip(s, stbi__get32be(s));
+
+ // Skip the reserved data.
+ stbi__skip(s, stbi__get32be(s));
+
+ // Find out if the data is compressed.
+ // Known values:
+ // 0: no compression
+ // 1: RLE compressed
+ compression = stbi__get16be(s);
+ if (compression > 1)
+ return stbi__errpuc("bad compression",
+ "PSD has an unknown compression format");
+
+ // Check size
+ if (!stbi__mad3sizes_valid(4, w, h, 0))
+ return stbi__errpuc("too large", "Corrupt PSD");
+
+ // Create the destination image.
+
+ if (!compression && bitdepth == 16 && bpc == 16) {
+ out = (stbi_uc *)stbi__malloc_mad3(8, w, h, 0);
+ ri->bits_per_channel = 16;
+ } else
+ out = (stbi_uc *)stbi__malloc(4 * w * h);
+
+ if (!out)
+ return stbi__errpuc("outofmem", "Out of memory");
+ pixelCount = w * h;
+
+ // Initialize the data to zero.
+ // memset( out, 0, pixelCount * 4 );
+
+ // Finally, the image data.
+ if (compression) {
+ // RLE as used by .PSD and .TIFF
+ // Loop until you get the number of unpacked bytes you are expecting:
+ // Read the next source byte into n.
+ // If n is between 0 and 127 inclusive, copy the next n+1 bytes
+ // literally. Else if n is between -127 and -1 inclusive, copy the
+ // next byte -n+1 times. Else if n is 128, noop.
+ // Endloop
+
+ // The RLE-compressed data is preceeded by a 2-byte data count for each
+ // row in the data, which we're going to just skip.
+ stbi__skip(s, h * channelCount * 2);
+
+ // Read the RLE data by channel.
+ for (channel = 0; channel < 4; channel++) {
+ stbi_uc *p;
+
+ p = out + channel;
+ if (channel >= channelCount) {
+ // Fill this channel with default data.
+ for (i = 0; i < pixelCount; i++, p += 4)
+ *p = (channel == 3 ? 255 : 0);
} else {
- stbi_uc *p = out+channel;
- stbi_uc val = channel == 3 ? 255 : 0;
- for (i = 0; i < pixelCount; i++, p += 4)
- *p = val;
+ // Read the RLE data.
+ if (!stbi__psd_decode_rle(s, p, pixelCount)) {
+ STBI_FREE(out);
+ return stbi__errpuc("corrupt", "bad RLE data");
+ }
}
- } else {
- if (ri->bits_per_channel == 16) { // output bpc
- stbi__uint16 *q = ((stbi__uint16 *) out) + channel;
- for (i = 0; i < pixelCount; i++, q += 4)
- *q = (stbi__uint16) stbi__get16be(s);
+ }
+
+ } else {
+ // We're at the raw image data. It's each channel in order (Red, Green,
+ // Blue, Alpha, ...) where each channel consists of an 8-bit (or 16-bit)
+ // value for each pixel in the image.
+
+ // Read the data by channel.
+ for (channel = 0; channel < 4; channel++) {
+ if (channel >= channelCount) {
+ // Fill this channel with default data.
+ if (bitdepth == 16 && bpc == 16) {
+ stbi__uint16 *q = ((stbi__uint16 *)out) + channel;
+ stbi__uint16 val = channel == 3 ? 65535 : 0;
+ for (i = 0; i < pixelCount; i++, q += 4)
+ *q = val;
+ } else {
+ stbi_uc *p = out + channel;
+ stbi_uc val = channel == 3 ? 255 : 0;
+ for (i = 0; i < pixelCount; i++, p += 4)
+ *p = val;
+ }
} else {
- stbi_uc *p = out+channel;
- if (bitdepth == 16) { // input bpc
- for (i = 0; i < pixelCount; i++, p += 4)
- *p = (stbi_uc) (stbi__get16be(s) >> 8);
- } else {
- for (i = 0; i < pixelCount; i++, p += 4)
- *p = stbi__get8(s);
- }
+ if (ri->bits_per_channel == 16) { // output bpc
+ stbi__uint16 *q = ((stbi__uint16 *)out) + channel;
+ for (i = 0; i < pixelCount; i++, q += 4)
+ *q = (stbi__uint16)stbi__get16be(s);
+ } else {
+ stbi_uc *p = out + channel;
+ if (bitdepth == 16) { // input bpc
+ for (i = 0; i < pixelCount; i++, p += 4)
+ *p = (stbi_uc)(stbi__get16be(s) >> 8);
+ } else {
+ for (i = 0; i < pixelCount; i++, p += 4)
+ *p = stbi__get8(s);
+ }
+ }
}
- }
- }
- }
-
- // remove weird white matte from PSD
- if (channelCount >= 4) {
- if (ri->bits_per_channel == 16) {
- for (i=0; i < w*h; ++i) {
- stbi__uint16 *pixel = (stbi__uint16 *) out + 4*i;
- if (pixel[3] != 0 && pixel[3] != 65535) {
- float a = pixel[3] / 65535.0f;
- float ra = 1.0f / a;
- float inv_a = 65535.0f * (1 - ra);
- pixel[0] = (stbi__uint16) (pixel[0]*ra + inv_a);
- pixel[1] = (stbi__uint16) (pixel[1]*ra + inv_a);
- pixel[2] = (stbi__uint16) (pixel[2]*ra + inv_a);
+ }
+ }
+
+ // remove weird white matte from PSD
+ if (channelCount >= 4) {
+ if (ri->bits_per_channel == 16) {
+ for (i = 0; i < w * h; ++i) {
+ stbi__uint16 *pixel = (stbi__uint16 *)out + 4 * i;
+ if (pixel[3] != 0 && pixel[3] != 65535) {
+ float a = pixel[3] / 65535.0f;
+ float ra = 1.0f / a;
+ float inv_a = 65535.0f * (1 - ra);
+ pixel[0] = (stbi__uint16)(pixel[0] * ra + inv_a);
+ pixel[1] = (stbi__uint16)(pixel[1] * ra + inv_a);
+ pixel[2] = (stbi__uint16)(pixel[2] * ra + inv_a);
+ }
}
- }
- } else {
- for (i=0; i < w*h; ++i) {
- unsigned char *pixel = out + 4*i;
- if (pixel[3] != 0 && pixel[3] != 255) {
- float a = pixel[3] / 255.0f;
- float ra = 1.0f / a;
- float inv_a = 255.0f * (1 - ra);
- pixel[0] = (unsigned char) (pixel[0]*ra + inv_a);
- pixel[1] = (unsigned char) (pixel[1]*ra + inv_a);
- pixel[2] = (unsigned char) (pixel[2]*ra + inv_a);
+ } else {
+ for (i = 0; i < w * h; ++i) {
+ unsigned char *pixel = out + 4 * i;
+ if (pixel[3] != 0 && pixel[3] != 255) {
+ float a = pixel[3] / 255.0f;
+ float ra = 1.0f / a;
+ float inv_a = 255.0f * (1 - ra);
+ pixel[0] = (unsigned char)(pixel[0] * ra + inv_a);
+ pixel[1] = (unsigned char)(pixel[1] * ra + inv_a);
+ pixel[2] = (unsigned char)(pixel[2] * ra + inv_a);
+ }
}
- }
- }
- }
+ }
+ }
- // convert to desired output format
- if (req_comp && req_comp != 4) {
- if (ri->bits_per_channel == 16)
- out = (stbi_uc *) stbi__convert_format16((stbi__uint16 *) out, 4, req_comp, w, h);
- else
- out = stbi__convert_format(out, 4, req_comp, w, h);
- if (out == NULL) return out; // stbi__convert_format frees input on failure
- }
+ // convert to desired output format
+ if (req_comp && req_comp != 4) {
+ if (ri->bits_per_channel == 16)
+ out = (stbi_uc *)stbi__convert_format16((stbi__uint16 *)out, 4,
+ req_comp, w, h);
+ else
+ out = stbi__convert_format(out, 4, req_comp, w, h);
+ if (out == NULL)
+ return out; // stbi__convert_format frees input on failure
+ }
- if (comp) *comp = 4;
- *y = h;
- *x = w;
+ if (comp)
+ *comp = 4;
+ *y = h;
+ *x = w;
- return out;
+ return out;
}
#endif
-// *************************************************************************************************
-// Softimage PIC loader
-// by Tom Seddon
-//
-// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format
-// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/
+ // *************************************************************************************************
+ // Softimage PIC loader
+ // by Tom Seddon
+ //
+ // See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format
+ // See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/
#ifndef STBI_NO_PIC
-static int stbi__pic_is4(stbi__context *s,const char *str)
+static int stbi__pic_is4(stbi__context *s, const char *str)
{
- int i;
- for (i=0; i<4; ++i)
- if (stbi__get8(s) != (stbi_uc)str[i])
- return 0;
+ int i;
+ for (i = 0; i < 4; ++i)
+ if (stbi__get8(s) != (stbi_uc)str[i])
+ return 0;
- return 1;
+ return 1;
}
static int stbi__pic_test_core(stbi__context *s)
{
- int i;
+ int i;
- if (!stbi__pic_is4(s,"\x53\x80\xF6\x34"))
- return 0;
+ if (!stbi__pic_is4(s, "\x53\x80\xF6\x34"))
+ return 0;
- for(i=0;i<84;++i)
- stbi__get8(s);
+ for (i = 0; i < 84; ++i)
+ stbi__get8(s);
- if (!stbi__pic_is4(s,"PICT"))
- return 0;
+ if (!stbi__pic_is4(s, "PICT"))
+ return 0;
- return 1;
+ return 1;
}
-typedef struct
-{
- stbi_uc size,type,channel;
+typedef struct {
+ stbi_uc size, type, channel;
} stbi__pic_packet;
static stbi_uc *stbi__readval(stbi__context *s, int channel, stbi_uc *dest)
{
- int mask=0x80, i;
+ int mask = 0x80, i;
- for (i=0; i<4; ++i, mask>>=1) {
- if (channel & mask) {
- if (stbi__at_eof(s)) return stbi__errpuc("bad file","PIC file too short");
- dest[i]=stbi__get8(s);
- }
- }
+ for (i = 0; i < 4; ++i, mask >>= 1) {
+ if (channel & mask) {
+ if (stbi__at_eof(s))
+ return stbi__errpuc("bad file", "PIC file too short");
+ dest[i] = stbi__get8(s);
+ }
+ }
- return dest;
+ return dest;
}
-static void stbi__copyval(int channel,stbi_uc *dest,const stbi_uc *src)
+static void stbi__copyval(int channel, stbi_uc *dest, const stbi_uc *src)
{
- int mask=0x80,i;
+ int mask = 0x80, i;
- for (i=0;i<4; ++i, mask>>=1)
- if (channel&mask)
- dest[i]=src[i];
+ for (i = 0; i < 4; ++i, mask >>= 1)
+ if (channel & mask)
+ dest[i] = src[i];
}
-static stbi_uc *stbi__pic_load_core(stbi__context *s,int width,int height,int *comp, stbi_uc *result)
+static stbi_uc *stbi__pic_load_core(stbi__context *s, int width, int height,
+ int *comp, stbi_uc *result)
{
- int act_comp=0,num_packets=0,y,chained;
- stbi__pic_packet packets[10];
+ int act_comp = 0, num_packets = 0, y, chained;
+ stbi__pic_packet packets[10];
- // this will (should...) cater for even some bizarre stuff like having data
+ // this will (should...) cater for even some bizarre stuff like having data
// for the same channel in multiple packets.
- do {
- stbi__pic_packet *packet;
+ do {
+ stbi__pic_packet *packet;
- if (num_packets==sizeof(packets)/sizeof(packets[0]))
- return stbi__errpuc("bad format","too many packets");
+ if (num_packets == sizeof(packets) / sizeof(packets[0]))
+ return stbi__errpuc("bad format", "too many packets");
- packet = &packets[num_packets++];
+ packet = &packets[num_packets++];
- chained = stbi__get8(s);
- packet->size = stbi__get8(s);
- packet->type = stbi__get8(s);
- packet->channel = stbi__get8(s);
+ chained = stbi__get8(s);
+ packet->size = stbi__get8(s);
+ packet->type = stbi__get8(s);
+ packet->channel = stbi__get8(s);
- act_comp |= packet->channel;
+ act_comp |= packet->channel;
- if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (reading packets)");
- if (packet->size != 8) return stbi__errpuc("bad format","packet isn't 8bpp");
- } while (chained);
+ if (stbi__at_eof(s))
+ return stbi__errpuc("bad file", "file too short (reading packets)");
+ if (packet->size != 8)
+ return stbi__errpuc("bad format", "packet isn't 8bpp");
+ } while (chained);
- *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel?
+ *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel?
- for(y=0; y<height; ++y) {
- int packet_idx;
+ for (y = 0; y < height; ++y) {
+ int packet_idx;
- for(packet_idx=0; packet_idx < num_packets; ++packet_idx) {
- stbi__pic_packet *packet = &packets[packet_idx];
- stbi_uc *dest = result+y*width*4;
+ for (packet_idx = 0; packet_idx < num_packets; ++packet_idx) {
+ stbi__pic_packet *packet = &packets[packet_idx];
+ stbi_uc *dest = result + y * width * 4;
- switch (packet->type) {
+ switch (packet->type) {
default:
- return stbi__errpuc("bad format","packet has bad compression type");
+ return stbi__errpuc("bad format",
+ "packet has bad compression type");
- case 0: {//uncompressed
- int x;
+ case 0: { // uncompressed
+ int x;
- for(x=0;x<width;++x, dest+=4)
- if (!stbi__readval(s,packet->channel,dest))
- return 0;
- break;
+ for (x = 0; x < width; ++x, dest += 4)
+ if (!stbi__readval(s, packet->channel, dest))
+ return 0;
+ break;
}
- case 1://Pure RLE
- {
- int left=width, i;
-
- while (left>0) {
- stbi_uc count,value[4];
-
- count=stbi__get8(s);
- if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pure read count)");
-
- if (count > left)
- count = (stbi_uc) left;
-
- if (!stbi__readval(s,packet->channel,value)) return 0;
-
- for(i=0; i<count; ++i,dest+=4)
- stbi__copyval(packet->channel,dest,value);
- left -= count;
- }
- }
- break;
+ case 1: // Pure RLE
+ {
+ int left = width, i;
- case 2: {//Mixed RLE
- int left=width;
- while (left>0) {
- int count = stbi__get8(s), i;
- if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (mixed read count)");
+ while (left > 0) {
+ stbi_uc count, value[4];
- if (count >= 128) { // Repeated
- stbi_uc value[4];
+ count = stbi__get8(s);
+ if (stbi__at_eof(s))
+ return stbi__errpuc("bad file",
+ "file too short (pure read count)");
- if (count==128)
- count = stbi__get16be(s);
- else
- count -= 127;
- if (count > left)
- return stbi__errpuc("bad file","scanline overrun");
+ if (count > left)
+ count = (stbi_uc)left;
- if (!stbi__readval(s,packet->channel,value))
+ if (!stbi__readval(s, packet->channel, value))
return 0;
- for(i=0;i<count;++i, dest += 4)
- stbi__copyval(packet->channel,dest,value);
- } else { // Raw
- ++count;
- if (count>left) return stbi__errpuc("bad file","scanline overrun");
-
- for(i=0;i<count;++i, dest+=4)
- if (!stbi__readval(s,packet->channel,dest))
- return 0;
- }
- left-=count;
- }
- break;
+ for (i = 0; i < count; ++i, dest += 4)
+ stbi__copyval(packet->channel, dest, value);
+ left -= count;
+ }
+ } break;
+
+ case 2: { // Mixed RLE
+ int left = width;
+ while (left > 0) {
+ int count = stbi__get8(s), i;
+ if (stbi__at_eof(s))
+ return stbi__errpuc(
+ "bad file", "file too short (mixed read count)");
+
+ if (count >= 128) { // Repeated
+ stbi_uc value[4];
+
+ if (count == 128)
+ count = stbi__get16be(s);
+ else
+ count -= 127;
+ if (count > left)
+ return stbi__errpuc("bad file", "scanline overrun");
+
+ if (!stbi__readval(s, packet->channel, value))
+ return 0;
+
+ for (i = 0; i < count; ++i, dest += 4)
+ stbi__copyval(packet->channel, dest, value);
+ } else { // Raw
+ ++count;
+ if (count > left)
+ return stbi__errpuc("bad file", "scanline overrun");
+
+ for (i = 0; i < count; ++i, dest += 4)
+ if (!stbi__readval(s, packet->channel, dest))
+ return 0;
+ }
+ left -= count;
+ }
+ break;
}
- }
- }
- }
+ }
+ }
+ }
- return result;
+ return result;
}
-static void *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp, stbi__result_info *ri)
+static void *stbi__pic_load(stbi__context *s, int *px, int *py, int *comp,
+ int req_comp, stbi__result_info *ri)
{
- stbi_uc *result;
- int i, x,y, internal_comp;
- STBI_NOTUSED(ri);
+ stbi_uc *result;
+ int i, x, y, internal_comp;
+ STBI_NOTUSED(ri);
- if (!comp) comp = &internal_comp;
+ if (!comp)
+ comp = &internal_comp;
- for (i=0; i<92; ++i)
- stbi__get8(s);
+ for (i = 0; i < 92; ++i)
+ stbi__get8(s);
- x = stbi__get16be(s);
- y = stbi__get16be(s);
- if (stbi__at_eof(s)) return stbi__errpuc("bad file","file too short (pic header)");
- if (!stbi__mad3sizes_valid(x, y, 4, 0)) return stbi__errpuc("too large", "PIC image too large to decode");
+ x = stbi__get16be(s);
+ y = stbi__get16be(s);
+ if (stbi__at_eof(s))
+ return stbi__errpuc("bad file", "file too short (pic header)");
+ if (!stbi__mad3sizes_valid(x, y, 4, 0))
+ return stbi__errpuc("too large", "PIC image too large to decode");
- stbi__get32be(s); //skip `ratio'
- stbi__get16be(s); //skip `fields'
- stbi__get16be(s); //skip `pad'
+ stbi__get32be(s); // skip `ratio'
+ stbi__get16be(s); // skip `fields'
+ stbi__get16be(s); // skip `pad'
- // intermediate buffer is RGBA
- result = (stbi_uc *) stbi__malloc_mad3(x, y, 4, 0);
- memset(result, 0xff, x*y*4);
+ // intermediate buffer is RGBA
+ result = (stbi_uc *)stbi__malloc_mad3(x, y, 4, 0);
+ memset(result, 0xff, x * y * 4);
- if (!stbi__pic_load_core(s,x,y,comp, result)) {
- STBI_FREE(result);
- result=0;
- }
- *px = x;
- *py = y;
- if (req_comp == 0) req_comp = *comp;
- result=stbi__convert_format(result,4,req_comp,x,y);
+ if (!stbi__pic_load_core(s, x, y, comp, result)) {
+ STBI_FREE(result);
+ result = 0;
+ }
+ *px = x;
+ *py = y;
+ if (req_comp == 0)
+ req_comp = *comp;
+ result = stbi__convert_format(result, 4, req_comp, x, y);
- return result;
+ return result;
}
static int stbi__pic_test(stbi__context *s)
{
- int r = stbi__pic_test_core(s);
- stbi__rewind(s);
- return r;
+ int r = stbi__pic_test_core(s);
+ stbi__rewind(s);
+ return r;
}
#endif
-// *************************************************************************************************
-// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb
+ // *************************************************************************************************
+ // GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by
+ // stb
#ifndef STBI_NO_GIF
-typedef struct
-{
- stbi__int16 prefix;
- stbi_uc first;
- stbi_uc suffix;
+typedef struct {
+ stbi__int16 prefix;
+ stbi_uc first;
+ stbi_uc suffix;
} stbi__gif_lzw;
-typedef struct
-{
- int w,h;
- stbi_uc *out, *old_out; // output buffer (always 4 components)
- int flags, bgindex, ratio, transparent, eflags, delay;
- stbi_uc pal[256][4];
- stbi_uc lpal[256][4];
- stbi__gif_lzw codes[4096];
- stbi_uc *color_table;
- int parse, step;
- int lflags;
- int start_x, start_y;
- int max_x, max_y;
- int cur_x, cur_y;
- int line_size;
+typedef struct {
+ int w, h;
+ stbi_uc *out, *old_out; // output buffer (always 4 components)
+ int flags, bgindex, ratio, transparent, eflags, delay;
+ stbi_uc pal[256][4];
+ stbi_uc lpal[256][4];
+ stbi__gif_lzw codes[4096];
+ stbi_uc *color_table;
+ int parse, step;
+ int lflags;
+ int start_x, start_y;
+ int max_x, max_y;
+ int cur_x, cur_y;
+ int line_size;
} stbi__gif;
static int stbi__gif_test_raw(stbi__context *s)
{
- int sz;
- if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') return 0;
- sz = stbi__get8(s);
- if (sz != '9' && sz != '7') return 0;
- if (stbi__get8(s) != 'a') return 0;
- return 1;
+ int sz;
+ if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' ||
+ stbi__get8(s) != '8')
+ return 0;
+ sz = stbi__get8(s);
+ if (sz != '9' && sz != '7')
+ return 0;
+ if (stbi__get8(s) != 'a')
+ return 0;
+ return 1;
}
static int stbi__gif_test(stbi__context *s)
{
- int r = stbi__gif_test_raw(s);
- stbi__rewind(s);
- return r;
+ int r = stbi__gif_test_raw(s);
+ stbi__rewind(s);
+ return r;
}
-static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256][4], int num_entries, int transp)
+static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256][4],
+ int num_entries, int transp)
{
- int i;
- for (i=0; i < num_entries; ++i) {
- pal[i][2] = stbi__get8(s);
- pal[i][1] = stbi__get8(s);
- pal[i][0] = stbi__get8(s);
- pal[i][3] = transp == i ? 0 : 255;
- }
+ int i;
+ for (i = 0; i < num_entries; ++i) {
+ pal[i][2] = stbi__get8(s);
+ pal[i][1] = stbi__get8(s);
+ pal[i][0] = stbi__get8(s);
+ pal[i][3] = transp == i ? 0 : 255;
+ }
}
-static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, int is_info)
+static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp,
+ int is_info)
{
- stbi_uc version;
- if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8')
- return stbi__err("not GIF", "Corrupt GIF");
+ stbi_uc version;
+ if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' ||
+ stbi__get8(s) != '8')
+ return stbi__err("not GIF", "Corrupt GIF");
- version = stbi__get8(s);
- if (version != '7' && version != '9') return stbi__err("not GIF", "Corrupt GIF");
- if (stbi__get8(s) != 'a') return stbi__err("not GIF", "Corrupt GIF");
+ version = stbi__get8(s);
+ if (version != '7' && version != '9')
+ return stbi__err("not GIF", "Corrupt GIF");
+ if (stbi__get8(s) != 'a')
+ return stbi__err("not GIF", "Corrupt GIF");
- stbi__g_failure_reason = "";
- g->w = stbi__get16le(s);
- g->h = stbi__get16le(s);
- g->flags = stbi__get8(s);
- g->bgindex = stbi__get8(s);
- g->ratio = stbi__get8(s);
- g->transparent = -1;
+ stbi__g_failure_reason = "";
+ g->w = stbi__get16le(s);
+ g->h = stbi__get16le(s);
+ g->flags = stbi__get8(s);
+ g->bgindex = stbi__get8(s);
+ g->ratio = stbi__get8(s);
+ g->transparent = -1;
- if (comp != 0) *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the comments
+ if (comp != 0)
+ *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the
+ // comments
- if (is_info) return 1;
+ if (is_info)
+ return 1;
- if (g->flags & 0x80)
- stbi__gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1);
+ if (g->flags & 0x80)
+ stbi__gif_parse_colortable(s, g->pal, 2 << (g->flags & 7), -1);
- return 1;
+ return 1;
}
static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp)
{
- stbi__gif* g = (stbi__gif*) stbi__malloc(sizeof(stbi__gif));
- if (!stbi__gif_header(s, g, comp, 1)) {
- STBI_FREE(g);
- stbi__rewind( s );
- return 0;
- }
- if (x) *x = g->w;
- if (y) *y = g->h;
- STBI_FREE(g);
- return 1;
+ stbi__gif *g = (stbi__gif *)stbi__malloc(sizeof(stbi__gif));
+ if (!stbi__gif_header(s, g, comp, 1)) {
+ STBI_FREE(g);
+ stbi__rewind(s);
+ return 0;
+ }
+ if (x)
+ *x = g->w;
+ if (y)
+ *y = g->h;
+ STBI_FREE(g);
+ return 1;
}
static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code)
{
- stbi_uc *p, *c;
+ stbi_uc *p, *c;
- // recurse to decode the prefixes, since the linked-list is backwards,
- // and working backwards through an interleaved image would be nasty
- if (g->codes[code].prefix >= 0)
- stbi__out_gif_code(g, g->codes[code].prefix);
+ // recurse to decode the prefixes, since the linked-list is backwards,
+ // and working backwards through an interleaved image would be nasty
+ if (g->codes[code].prefix >= 0)
+ stbi__out_gif_code(g, g->codes[code].prefix);
- if (g->cur_y >= g->max_y) return;
+ if (g->cur_y >= g->max_y)
+ return;
- p = &g->out[g->cur_x + g->cur_y];
- c = &g->color_table[g->codes[code].suffix * 4];
+ p = &g->out[g->cur_x + g->cur_y];
+ c = &g->color_table[g->codes[code].suffix * 4];
- if (c[3] >= 128) {
- p[0] = c[2];
- p[1] = c[1];
- p[2] = c[0];
- p[3] = c[3];
- }
- g->cur_x += 4;
+ if (c[3] >= 128) {
+ p[0] = c[2];
+ p[1] = c[1];
+ p[2] = c[0];
+ p[3] = c[3];
+ }
+ g->cur_x += 4;
- if (g->cur_x >= g->max_x) {
- g->cur_x = g->start_x;
- g->cur_y += g->step;
+ if (g->cur_x >= g->max_x) {
+ g->cur_x = g->start_x;
+ g->cur_y += g->step;
- while (g->cur_y >= g->max_y && g->parse > 0) {
- g->step = (1 << g->parse) * g->line_size;
- g->cur_y = g->start_y + (g->step >> 1);
- --g->parse;
- }
- }
+ while (g->cur_y >= g->max_y && g->parse > 0) {
+ g->step = (1 << g->parse) * g->line_size;
+ g->cur_y = g->start_y + (g->step >> 1);
+ --g->parse;
+ }
+ }
}
static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g)
{
- stbi_uc lzw_cs;
- stbi__int32 len, init_code;
- stbi__uint32 first;
- stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear;
- stbi__gif_lzw *p;
-
- lzw_cs = stbi__get8(s);
- if (lzw_cs > 12) return NULL;
- clear = 1 << lzw_cs;
- first = 1;
- codesize = lzw_cs + 1;
- codemask = (1 << codesize) - 1;
- bits = 0;
- valid_bits = 0;
- for (init_code = 0; init_code < clear; init_code++) {
- g->codes[init_code].prefix = -1;
- g->codes[init_code].first = (stbi_uc) init_code;
- g->codes[init_code].suffix = (stbi_uc) init_code;
- }
-
- // support no starting clear code
- avail = clear+2;
- oldcode = -1;
-
- len = 0;
- for(;;) {
- if (valid_bits < codesize) {
- if (len == 0) {
- len = stbi__get8(s); // start new block
- if (len == 0)
- return g->out;
- }
- --len;
- bits |= (stbi__int32) stbi__get8(s) << valid_bits;
- valid_bits += 8;
- } else {
- stbi__int32 code = bits & codemask;
- bits >>= codesize;
- valid_bits -= codesize;
- // @OPTIMIZE: is there some way we can accelerate the non-clear path?
- if (code == clear) { // clear code
- codesize = lzw_cs + 1;
- codemask = (1 << codesize) - 1;
- avail = clear + 2;
- oldcode = -1;
- first = 0;
- } else if (code == clear + 1) { // end of stream code
- stbi__skip(s, len);
- while ((len = stbi__get8(s)) > 0)
- stbi__skip(s,len);
- return g->out;
- } else if (code <= avail) {
- if (first) return stbi__errpuc("no clear code", "Corrupt GIF");
-
- if (oldcode >= 0) {
- p = &g->codes[avail++];
- if (avail > 4096) return stbi__errpuc("too many codes", "Corrupt GIF");
- p->prefix = (stbi__int16) oldcode;
- p->first = g->codes[oldcode].first;
- p->suffix = (code == avail) ? p->first : g->codes[code].first;
- } else if (code == avail)
- return stbi__errpuc("illegal code in raster", "Corrupt GIF");
-
- stbi__out_gif_code(g, (stbi__uint16) code);
-
- if ((avail & codemask) == 0 && avail <= 0x0FFF) {
- codesize++;
- codemask = (1 << codesize) - 1;
+ stbi_uc lzw_cs;
+ stbi__int32 len, init_code;
+ stbi__uint32 first;
+ stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear;
+ stbi__gif_lzw *p;
+
+ lzw_cs = stbi__get8(s);
+ if (lzw_cs > 12)
+ return NULL;
+ clear = 1 << lzw_cs;
+ first = 1;
+ codesize = lzw_cs + 1;
+ codemask = (1 << codesize) - 1;
+ bits = 0;
+ valid_bits = 0;
+ for (init_code = 0; init_code < clear; init_code++) {
+ g->codes[init_code].prefix = -1;
+ g->codes[init_code].first = (stbi_uc)init_code;
+ g->codes[init_code].suffix = (stbi_uc)init_code;
+ }
+
+ // support no starting clear code
+ avail = clear + 2;
+ oldcode = -1;
+
+ len = 0;
+ for (;;) {
+ if (valid_bits < codesize) {
+ if (len == 0) {
+ len = stbi__get8(s); // start new block
+ if (len == 0)
+ return g->out;
}
+ --len;
+ bits |= (stbi__int32)stbi__get8(s) << valid_bits;
+ valid_bits += 8;
+ } else {
+ stbi__int32 code = bits & codemask;
+ bits >>= codesize;
+ valid_bits -= codesize;
+ // @OPTIMIZE: is there some way we can accelerate the non-clear
+ // path?
+ if (code == clear) { // clear code
+ codesize = lzw_cs + 1;
+ codemask = (1 << codesize) - 1;
+ avail = clear + 2;
+ oldcode = -1;
+ first = 0;
+ } else if (code == clear + 1) { // end of stream code
+ stbi__skip(s, len);
+ while ((len = stbi__get8(s)) > 0)
+ stbi__skip(s, len);
+ return g->out;
+ } else if (code <= avail) {
+ if (first)
+ return stbi__errpuc("no clear code", "Corrupt GIF");
+
+ if (oldcode >= 0) {
+ p = &g->codes[avail++];
+ if (avail > 4096)
+ return stbi__errpuc("too many codes", "Corrupt GIF");
+ p->prefix = (stbi__int16)oldcode;
+ p->first = g->codes[oldcode].first;
+ p->suffix =
+ (code == avail) ? p->first : g->codes[code].first;
+ } else if (code == avail)
+ return stbi__errpuc("illegal code in raster",
+ "Corrupt GIF");
+
+ stbi__out_gif_code(g, (stbi__uint16)code);
+
+ if ((avail & codemask) == 0 && avail <= 0x0FFF) {
+ codesize++;
+ codemask = (1 << codesize) - 1;
+ }
+
+ oldcode = code;
+ } else {
+ return stbi__errpuc("illegal code in raster", "Corrupt GIF");
+ }
+ }
+ }
+}
- oldcode = code;
- } else {
- return stbi__errpuc("illegal code in raster", "Corrupt GIF");
- }
- }
- }
-}
-
-static void stbi__fill_gif_background(stbi__gif *g, int x0, int y0, int x1, int y1)
-{
- int x, y;
- stbi_uc *c = g->pal[g->bgindex];
- for (y = y0; y < y1; y += 4 * g->w) {
- for (x = x0; x < x1; x += 4) {
- stbi_uc *p = &g->out[y + x];
- p[0] = c[2];
- p[1] = c[1];
- p[2] = c[0];
- p[3] = 0;
- }
- }
-}
-
-// this function is designed to support animated gifs, although stb_image doesn't support it
-static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp)
-{
- int i;
- stbi_uc *prev_out = 0;
-
- if (g->out == 0 && !stbi__gif_header(s, g, comp,0))
- return 0; // stbi__g_failure_reason set by stbi__gif_header
-
- if (!stbi__mad3sizes_valid(g->w, g->h, 4, 0))
- return stbi__errpuc("too large", "GIF too large");
-
- prev_out = g->out;
- g->out = (stbi_uc *) stbi__malloc_mad3(4, g->w, g->h, 0);
- if (g->out == 0) return stbi__errpuc("outofmem", "Out of memory");
-
- switch ((g->eflags & 0x1C) >> 2) {
- case 0: // unspecified (also always used on 1st frame)
- stbi__fill_gif_background(g, 0, 0, 4 * g->w, 4 * g->w * g->h);
- break;
- case 1: // do not dispose
- if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h);
- g->old_out = prev_out;
- break;
- case 2: // dispose to background
- if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h);
- stbi__fill_gif_background(g, g->start_x, g->start_y, g->max_x, g->max_y);
- break;
- case 3: // dispose to previous
- if (g->old_out) {
+static void stbi__fill_gif_background(stbi__gif *g, int x0, int y0, int x1,
+ int y1)
+{
+ int x, y;
+ stbi_uc *c = g->pal[g->bgindex];
+ for (y = y0; y < y1; y += 4 * g->w) {
+ for (x = x0; x < x1; x += 4) {
+ stbi_uc *p = &g->out[y + x];
+ p[0] = c[2];
+ p[1] = c[1];
+ p[2] = c[0];
+ p[3] = 0;
+ }
+ }
+}
+
+// this function is designed to support animated gifs, although stb_image
+// doesn't support it
+static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp,
+ int req_comp)
+{
+ int i;
+ stbi_uc *prev_out = 0;
+
+ if (g->out == 0 && !stbi__gif_header(s, g, comp, 0))
+ return 0; // stbi__g_failure_reason set by stbi__gif_header
+
+ if (!stbi__mad3sizes_valid(g->w, g->h, 4, 0))
+ return stbi__errpuc("too large", "GIF too large");
+
+ prev_out = g->out;
+ g->out = (stbi_uc *)stbi__malloc_mad3(4, g->w, g->h, 0);
+ if (g->out == 0)
+ return stbi__errpuc("outofmem", "Out of memory");
+
+ switch ((g->eflags & 0x1C) >> 2) {
+ case 0: // unspecified (also always used on 1st frame)
+ stbi__fill_gif_background(g, 0, 0, 4 * g->w, 4 * g->w * g->h);
+ break;
+ case 1: // do not dispose
+ if (prev_out)
+ memcpy(g->out, prev_out, 4 * g->w * g->h);
+ g->old_out = prev_out;
+ break;
+ case 2: // dispose to background
+ if (prev_out)
+ memcpy(g->out, prev_out, 4 * g->w * g->h);
+ stbi__fill_gif_background(g, g->start_x, g->start_y, g->max_x,
+ g->max_y);
+ break;
+ case 3: // dispose to previous
+ if (g->old_out) {
for (i = g->start_y; i < g->max_y; i += 4 * g->w)
- memcpy(&g->out[i + g->start_x], &g->old_out[i + g->start_x], g->max_x - g->start_x);
- }
- break;
- }
-
- for (;;) {
- switch (stbi__get8(s)) {
- case 0x2C: /* Image Descriptor */
- {
+ memcpy(&g->out[i + g->start_x], &g->old_out[i + g->start_x],
+ g->max_x - g->start_x);
+ }
+ break;
+ }
+
+ for (;;) {
+ switch (stbi__get8(s)) {
+ case 0x2C: /* Image Descriptor */
+ {
int prev_trans = -1;
stbi__int32 x, y, w, h;
stbi_uc *o;
@@ -6300,101 +7239,105 @@ static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, i
w = stbi__get16le(s);
h = stbi__get16le(s);
if (((x + w) > (g->w)) || ((y + h) > (g->h)))
- return stbi__errpuc("bad Image Descriptor", "Corrupt GIF");
+ return stbi__errpuc("bad Image Descriptor", "Corrupt GIF");
g->line_size = g->w * 4;
- g->start_x = x * 4;
- g->start_y = y * g->line_size;
- g->max_x = g->start_x + w * 4;
- g->max_y = g->start_y + h * g->line_size;
- g->cur_x = g->start_x;
- g->cur_y = g->start_y;
+ g->start_x = x * 4;
+ g->start_y = y * g->line_size;
+ g->max_x = g->start_x + w * 4;
+ g->max_y = g->start_y + h * g->line_size;
+ g->cur_x = g->start_x;
+ g->cur_y = g->start_y;
g->lflags = stbi__get8(s);
if (g->lflags & 0x40) {
- g->step = 8 * g->line_size; // first interlaced spacing
- g->parse = 3;
+ g->step = 8 * g->line_size; // first interlaced spacing
+ g->parse = 3;
} else {
- g->step = g->line_size;
- g->parse = 0;
+ g->step = g->line_size;
+ g->parse = 0;
}
if (g->lflags & 0x80) {
- stbi__gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1);
- g->color_table = (stbi_uc *) g->lpal;
+ stbi__gif_parse_colortable(s, g->lpal, 2 << (g->lflags & 7),
+ g->eflags & 0x01 ? g->transparent
+ : -1);
+ g->color_table = (stbi_uc *)g->lpal;
} else if (g->flags & 0x80) {
- if (g->transparent >= 0 && (g->eflags & 0x01)) {
- prev_trans = g->pal[g->transparent][3];
- g->pal[g->transparent][3] = 0;
- }
- g->color_table = (stbi_uc *) g->pal;
+ if (g->transparent >= 0 && (g->eflags & 0x01)) {
+ prev_trans = g->pal[g->transparent][3];
+ g->pal[g->transparent][3] = 0;
+ }
+ g->color_table = (stbi_uc *)g->pal;
} else
- return stbi__errpuc("missing color table", "Corrupt GIF");
+ return stbi__errpuc("missing color table", "Corrupt GIF");
o = stbi__process_gif_raster(s, g);
- if (o == NULL) return NULL;
+ if (o == NULL)
+ return NULL;
if (prev_trans != -1)
- g->pal[g->transparent][3] = (stbi_uc) prev_trans;
+ g->pal[g->transparent][3] = (stbi_uc)prev_trans;
return o;
- }
+ }
- case 0x21: // Comment Extension.
- {
+ case 0x21: // Comment Extension.
+ {
int len;
if (stbi__get8(s) == 0xF9) { // Graphic Control Extension.
- len = stbi__get8(s);
- if (len == 4) {
- g->eflags = stbi__get8(s);
- g->delay = stbi__get16le(s);
- g->transparent = stbi__get8(s);
- } else {
- stbi__skip(s, len);
- break;
- }
+ len = stbi__get8(s);
+ if (len == 4) {
+ g->eflags = stbi__get8(s);
+ g->delay = stbi__get16le(s);
+ g->transparent = stbi__get8(s);
+ } else {
+ stbi__skip(s, len);
+ break;
+ }
}
while ((len = stbi__get8(s)) != 0)
- stbi__skip(s, len);
+ stbi__skip(s, len);
break;
- }
+ }
- case 0x3B: // gif stream termination code
- return (stbi_uc *) s; // using '1' causes warning on some compilers
+ case 0x3B: // gif stream termination code
+ return (stbi_uc *)s; // using '1' causes warning on some compilers
- default:
+ default:
return stbi__errpuc("unknown code", "Corrupt GIF");
- }
- }
+ }
+ }
- STBI_NOTUSED(req_comp);
+ STBI_NOTUSED(req_comp);
}
-static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+static void *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri)
{
- stbi_uc *u = 0;
- stbi__gif* g = (stbi__gif*) stbi__malloc(sizeof(stbi__gif));
- memset(g, 0, sizeof(*g));
- STBI_NOTUSED(ri);
+ stbi_uc *u = 0;
+ stbi__gif *g = (stbi__gif *)stbi__malloc(sizeof(stbi__gif));
+ memset(g, 0, sizeof(*g));
+ STBI_NOTUSED(ri);
- u = stbi__gif_load_next(s, g, comp, req_comp);
- if (u == (stbi_uc *) s) u = 0; // end of animated gif marker
- if (u) {
- *x = g->w;
- *y = g->h;
- if (req_comp && req_comp != 4)
- u = stbi__convert_format(u, 4, req_comp, g->w, g->h);
- }
- else if (g->out)
- STBI_FREE(g->out);
- STBI_FREE(g);
- return u;
+ u = stbi__gif_load_next(s, g, comp, req_comp);
+ if (u == (stbi_uc *)s)
+ u = 0; // end of animated gif marker
+ if (u) {
+ *x = g->w;
+ *y = g->h;
+ if (req_comp && req_comp != 4)
+ u = stbi__convert_format(u, 4, req_comp, g->w, g->h);
+ } else if (g->out)
+ STBI_FREE(g->out);
+ STBI_FREE(g);
+ return u;
}
static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp)
{
- return stbi__gif_info_raw(s,x,y,comp);
+ return stbi__gif_info_raw(s, x, y, comp);
}
#endif
@@ -6404,528 +7347,598 @@ static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp)
#ifndef STBI_NO_HDR
static int stbi__hdr_test_core(stbi__context *s, const char *signature)
{
- int i;
- for (i=0; signature[i]; ++i)
- if (stbi__get8(s) != signature[i])
- return 0;
- stbi__rewind(s);
- return 1;
+ int i;
+ for (i = 0; signature[i]; ++i)
+ if (stbi__get8(s) != signature[i])
+ return 0;
+ stbi__rewind(s);
+ return 1;
}
-static int stbi__hdr_test(stbi__context* s)
+static int stbi__hdr_test(stbi__context *s)
{
- int r = stbi__hdr_test_core(s, "#?RADIANCE\n");
- stbi__rewind(s);
- if(!r) {
- r = stbi__hdr_test_core(s, "#?RGBE\n");
- stbi__rewind(s);
- }
- return r;
+ int r = stbi__hdr_test_core(s, "#?RADIANCE\n");
+ stbi__rewind(s);
+ if (!r) {
+ r = stbi__hdr_test_core(s, "#?RGBE\n");
+ stbi__rewind(s);
+ }
+ return r;
}
-#define STBI__HDR_BUFLEN 1024
+#define STBI__HDR_BUFLEN 1024
static char *stbi__hdr_gettoken(stbi__context *z, char *buffer)
{
- int len=0;
- char c = '\0';
+ int len = 0;
+ char c = '\0';
- c = (char) stbi__get8(z);
+ c = (char)stbi__get8(z);
- while (!stbi__at_eof(z) && c != '\n') {
- buffer[len++] = c;
- if (len == STBI__HDR_BUFLEN-1) {
- // flush to end of line
- while (!stbi__at_eof(z) && stbi__get8(z) != '\n')
- ;
- break;
- }
- c = (char) stbi__get8(z);
- }
+ while (!stbi__at_eof(z) && c != '\n') {
+ buffer[len++] = c;
+ if (len == STBI__HDR_BUFLEN - 1) {
+ // flush to end of line
+ while (!stbi__at_eof(z) && stbi__get8(z) != '\n')
+ ;
+ break;
+ }
+ c = (char)stbi__get8(z);
+ }
- buffer[len] = 0;
- return buffer;
+ buffer[len] = 0;
+ return buffer;
}
static void stbi__hdr_convert(float *output, stbi_uc *input, int req_comp)
{
- if ( input[3] != 0 ) {
- float f1;
- // Exponent
- f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8));
- if (req_comp <= 2)
- output[0] = (input[0] + input[1] + input[2]) * f1 / 3;
- else {
- output[0] = input[0] * f1;
- output[1] = input[1] * f1;
- output[2] = input[2] * f1;
- }
- if (req_comp == 2) output[1] = 1;
- if (req_comp == 4) output[3] = 1;
- } else {
- switch (req_comp) {
- case 4: output[3] = 1; /* fallthrough */
- case 3: output[0] = output[1] = output[2] = 0;
- break;
- case 2: output[1] = 1; /* fallthrough */
- case 1: output[0] = 0;
- break;
- }
- }
-}
-
-static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
-{
- char buffer[STBI__HDR_BUFLEN];
- char *token;
- int valid = 0;
- int width, height;
- stbi_uc *scanline;
- float *hdr_data;
- int len;
- unsigned char count, value;
- int i, j, k, c1,c2, z;
- const char *headerToken;
- STBI_NOTUSED(ri);
-
- // Check identifier
- headerToken = stbi__hdr_gettoken(s,buffer);
- if (strcmp(headerToken, "#?RADIANCE") != 0 && strcmp(headerToken, "#?RGBE") != 0)
- return stbi__errpf("not HDR", "Corrupt HDR image");
-
- // Parse header
- for(;;) {
- token = stbi__hdr_gettoken(s,buffer);
- if (token[0] == 0) break;
- if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
- }
-
- if (!valid) return stbi__errpf("unsupported format", "Unsupported HDR format");
-
- // Parse width and height
- // can't use sscanf() if we're not using stdio!
- token = stbi__hdr_gettoken(s,buffer);
- if (strncmp(token, "-Y ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format");
- token += 3;
- height = (int) strtol(token, &token, 10);
- while (*token == ' ') ++token;
- if (strncmp(token, "+X ", 3)) return stbi__errpf("unsupported data layout", "Unsupported HDR format");
- token += 3;
- width = (int) strtol(token, NULL, 10);
-
- *x = width;
- *y = height;
-
- if (comp) *comp = 3;
- if (req_comp == 0) req_comp = 3;
-
- if (!stbi__mad4sizes_valid(width, height, req_comp, sizeof(float), 0))
- return stbi__errpf("too large", "HDR image is too large");
-
- // Read data
- hdr_data = (float *) stbi__malloc_mad4(width, height, req_comp, sizeof(float), 0);
- if (!hdr_data)
- return stbi__errpf("outofmem", "Out of memory");
-
- // Load image data
- // image data is stored as some number of sca
- if ( width < 8 || width >= 32768) {
- // Read flat data
- for (j=0; j < height; ++j) {
- for (i=0; i < width; ++i) {
- stbi_uc rgbe[4];
- main_decode_loop:
- stbi__getn(s, rgbe, 4);
- stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp);
- }
- }
- } else {
- // Read RLE-encoded data
- scanline = NULL;
-
- for (j = 0; j < height; ++j) {
- c1 = stbi__get8(s);
- c2 = stbi__get8(s);
- len = stbi__get8(s);
- if (c1 != 2 || c2 != 2 || (len & 0x80)) {
- // not run-length encoded, so we have to actually use THIS data as a decoded
- // pixel (note this can't be a valid pixel--one of RGB must be >= 128)
- stbi_uc rgbe[4];
- rgbe[0] = (stbi_uc) c1;
- rgbe[1] = (stbi_uc) c2;
- rgbe[2] = (stbi_uc) len;
- rgbe[3] = (stbi_uc) stbi__get8(s);
- stbi__hdr_convert(hdr_data, rgbe, req_comp);
- i = 1;
- j = 0;
- STBI_FREE(scanline);
- goto main_decode_loop; // yes, this makes no sense
- }
- len <<= 8;
- len |= stbi__get8(s);
- if (len != width) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("invalid decoded scanline length", "corrupt HDR"); }
- if (scanline == NULL) {
- scanline = (stbi_uc *) stbi__malloc_mad2(width, 4, 0);
- if (!scanline) {
- STBI_FREE(hdr_data);
- return stbi__errpf("outofmem", "Out of memory");
+ if (input[3] != 0) {
+ float f1;
+ // Exponent
+ f1 = (float)ldexp(1.0f, input[3] - (int)(128 + 8));
+ if (req_comp <= 2)
+ output[0] = (input[0] + input[1] + input[2]) * f1 / 3;
+ else {
+ output[0] = input[0] * f1;
+ output[1] = input[1] * f1;
+ output[2] = input[2] * f1;
+ }
+ if (req_comp == 2)
+ output[1] = 1;
+ if (req_comp == 4)
+ output[3] = 1;
+ } else {
+ switch (req_comp) {
+ case 4:
+ output[3] = 1; /* fallthrough */
+ case 3:
+ output[0] = output[1] = output[2] = 0;
+ break;
+ case 2:
+ output[1] = 1; /* fallthrough */
+ case 1:
+ output[0] = 0;
+ break;
+ }
+ }
+}
+
+static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri)
+{
+ char buffer[STBI__HDR_BUFLEN];
+ char *token;
+ int valid = 0;
+ int width, height;
+ stbi_uc *scanline;
+ float *hdr_data;
+ int len;
+ unsigned char count, value;
+ int i, j, k, c1, c2, z;
+ const char *headerToken;
+ STBI_NOTUSED(ri);
+
+ // Check identifier
+ headerToken = stbi__hdr_gettoken(s, buffer);
+ if (strcmp(headerToken, "#?RADIANCE") != 0 &&
+ strcmp(headerToken, "#?RGBE") != 0)
+ return stbi__errpf("not HDR", "Corrupt HDR image");
+
+ // Parse header
+ for (;;) {
+ token = stbi__hdr_gettoken(s, buffer);
+ if (token[0] == 0)
+ break;
+ if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0)
+ valid = 1;
+ }
+
+ if (!valid)
+ return stbi__errpf("unsupported format", "Unsupported HDR format");
+
+ // Parse width and height
+ // can't use sscanf() if we're not using stdio!
+ token = stbi__hdr_gettoken(s, buffer);
+ if (strncmp(token, "-Y ", 3))
+ return stbi__errpf("unsupported data layout", "Unsupported HDR format");
+ token += 3;
+ height = (int)strtol(token, &token, 10);
+ while (*token == ' ')
+ ++token;
+ if (strncmp(token, "+X ", 3))
+ return stbi__errpf("unsupported data layout", "Unsupported HDR format");
+ token += 3;
+ width = (int)strtol(token, NULL, 10);
+
+ *x = width;
+ *y = height;
+
+ if (comp)
+ *comp = 3;
+ if (req_comp == 0)
+ req_comp = 3;
+
+ if (!stbi__mad4sizes_valid(width, height, req_comp, sizeof(float), 0))
+ return stbi__errpf("too large", "HDR image is too large");
+
+ // Read data
+ hdr_data =
+ (float *)stbi__malloc_mad4(width, height, req_comp, sizeof(float), 0);
+ if (!hdr_data)
+ return stbi__errpf("outofmem", "Out of memory");
+
+ // Load image data
+ // image data is stored as some number of sca
+ if (width < 8 || width >= 32768) {
+ // Read flat data
+ for (j = 0; j < height; ++j) {
+ for (i = 0; i < width; ++i) {
+ stbi_uc rgbe[4];
+ main_decode_loop:
+ stbi__getn(s, rgbe, 4);
+ stbi__hdr_convert(hdr_data + j * width * req_comp +
+ i * req_comp,
+ rgbe, req_comp);
+ }
+ }
+ } else {
+ // Read RLE-encoded data
+ scanline = NULL;
+
+ for (j = 0; j < height; ++j) {
+ c1 = stbi__get8(s);
+ c2 = stbi__get8(s);
+ len = stbi__get8(s);
+ if (c1 != 2 || c2 != 2 || (len & 0x80)) {
+ // not run-length encoded, so we have to actually use THIS data
+ // as a decoded pixel (note this can't be a valid pixel--one of
+ // RGB must be >= 128)
+ stbi_uc rgbe[4];
+ rgbe[0] = (stbi_uc)c1;
+ rgbe[1] = (stbi_uc)c2;
+ rgbe[2] = (stbi_uc)len;
+ rgbe[3] = (stbi_uc)stbi__get8(s);
+ stbi__hdr_convert(hdr_data, rgbe, req_comp);
+ i = 1;
+ j = 0;
+ STBI_FREE(scanline);
+ goto main_decode_loop; // yes, this makes no sense
}
- }
-
- for (k = 0; k < 4; ++k) {
- int nleft;
- i = 0;
- while ((nleft = width - i) > 0) {
- count = stbi__get8(s);
- if (count > 128) {
- // Run
- value = stbi__get8(s);
- count -= 128;
- if (count > nleft) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); }
- for (z = 0; z < count; ++z)
- scanline[i++ * 4 + k] = value;
- } else {
- // Dump
- if (count > nleft) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("corrupt", "bad RLE data in HDR"); }
- for (z = 0; z < count; ++z)
- scanline[i++ * 4 + k] = stbi__get8(s);
- }
+ len <<= 8;
+ len |= stbi__get8(s);
+ if (len != width) {
+ STBI_FREE(hdr_data);
+ STBI_FREE(scanline);
+ return stbi__errpf("invalid decoded scanline length",
+ "corrupt HDR");
}
- }
- for (i=0; i < width; ++i)
- stbi__hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp);
- }
- if (scanline)
- STBI_FREE(scanline);
- }
+ if (scanline == NULL) {
+ scanline = (stbi_uc *)stbi__malloc_mad2(width, 4, 0);
+ if (!scanline) {
+ STBI_FREE(hdr_data);
+ return stbi__errpf("outofmem", "Out of memory");
+ }
+ }
+
+ for (k = 0; k < 4; ++k) {
+ int nleft;
+ i = 0;
+ while ((nleft = width - i) > 0) {
+ count = stbi__get8(s);
+ if (count > 128) {
+ // Run
+ value = stbi__get8(s);
+ count -= 128;
+ if (count > nleft) {
+ STBI_FREE(hdr_data);
+ STBI_FREE(scanline);
+ return stbi__errpf("corrupt",
+ "bad RLE data in HDR");
+ }
+ for (z = 0; z < count; ++z)
+ scanline[i++ * 4 + k] = value;
+ } else {
+ // Dump
+ if (count > nleft) {
+ STBI_FREE(hdr_data);
+ STBI_FREE(scanline);
+ return stbi__errpf("corrupt",
+ "bad RLE data in HDR");
+ }
+ for (z = 0; z < count; ++z)
+ scanline[i++ * 4 + k] = stbi__get8(s);
+ }
+ }
+ }
+ for (i = 0; i < width; ++i)
+ stbi__hdr_convert(hdr_data + (j * width + i) * req_comp,
+ scanline + i * 4, req_comp);
+ }
+ if (scanline)
+ STBI_FREE(scanline);
+ }
- return hdr_data;
+ return hdr_data;
}
static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp)
{
- char buffer[STBI__HDR_BUFLEN];
- char *token;
- int valid = 0;
- int dummy;
-
- if (!x) x = &dummy;
- if (!y) y = &dummy;
- if (!comp) comp = &dummy;
-
- if (stbi__hdr_test(s) == 0) {
- stbi__rewind( s );
- return 0;
- }
-
- for(;;) {
- token = stbi__hdr_gettoken(s,buffer);
- if (token[0] == 0) break;
- if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
- }
-
- if (!valid) {
- stbi__rewind( s );
- return 0;
- }
- token = stbi__hdr_gettoken(s,buffer);
- if (strncmp(token, "-Y ", 3)) {
- stbi__rewind( s );
- return 0;
- }
- token += 3;
- *y = (int) strtol(token, &token, 10);
- while (*token == ' ') ++token;
- if (strncmp(token, "+X ", 3)) {
- stbi__rewind( s );
- return 0;
- }
- token += 3;
- *x = (int) strtol(token, NULL, 10);
- *comp = 3;
- return 1;
+ char buffer[STBI__HDR_BUFLEN];
+ char *token;
+ int valid = 0;
+ int dummy;
+
+ if (!x)
+ x = &dummy;
+ if (!y)
+ y = &dummy;
+ if (!comp)
+ comp = &dummy;
+
+ if (stbi__hdr_test(s) == 0) {
+ stbi__rewind(s);
+ return 0;
+ }
+
+ for (;;) {
+ token = stbi__hdr_gettoken(s, buffer);
+ if (token[0] == 0)
+ break;
+ if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0)
+ valid = 1;
+ }
+
+ if (!valid) {
+ stbi__rewind(s);
+ return 0;
+ }
+ token = stbi__hdr_gettoken(s, buffer);
+ if (strncmp(token, "-Y ", 3)) {
+ stbi__rewind(s);
+ return 0;
+ }
+ token += 3;
+ *y = (int)strtol(token, &token, 10);
+ while (*token == ' ')
+ ++token;
+ if (strncmp(token, "+X ", 3)) {
+ stbi__rewind(s);
+ return 0;
+ }
+ token += 3;
+ *x = (int)strtol(token, NULL, 10);
+ *comp = 3;
+ return 1;
}
#endif // STBI_NO_HDR
#ifndef STBI_NO_BMP
static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp)
{
- void *p;
- stbi__bmp_data info;
-
- info.all_a = 255;
- p = stbi__bmp_parse_header(s, &info);
- stbi__rewind( s );
- if (p == NULL)
- return 0;
- if (x) *x = s->img_x;
- if (y) *y = s->img_y;
- if (comp) *comp = info.ma ? 4 : 3;
- return 1;
+ void *p;
+ stbi__bmp_data info;
+
+ info.all_a = 255;
+ p = stbi__bmp_parse_header(s, &info);
+ stbi__rewind(s);
+ if (p == NULL)
+ return 0;
+ if (x)
+ *x = s->img_x;
+ if (y)
+ *y = s->img_y;
+ if (comp)
+ *comp = info.ma ? 4 : 3;
+ return 1;
}
#endif
#ifndef STBI_NO_PSD
static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp)
{
- int channelCount, dummy;
- if (!x) x = &dummy;
- if (!y) y = &dummy;
- if (!comp) comp = &dummy;
- if (stbi__get32be(s) != 0x38425053) {
- stbi__rewind( s );
- return 0;
- }
- if (stbi__get16be(s) != 1) {
- stbi__rewind( s );
- return 0;
- }
- stbi__skip(s, 6);
- channelCount = stbi__get16be(s);
- if (channelCount < 0 || channelCount > 16) {
- stbi__rewind( s );
- return 0;
- }
- *y = stbi__get32be(s);
- *x = stbi__get32be(s);
- if (stbi__get16be(s) != 8) {
- stbi__rewind( s );
- return 0;
- }
- if (stbi__get16be(s) != 3) {
- stbi__rewind( s );
- return 0;
- }
- *comp = 4;
- return 1;
+ int channelCount, dummy;
+ if (!x)
+ x = &dummy;
+ if (!y)
+ y = &dummy;
+ if (!comp)
+ comp = &dummy;
+ if (stbi__get32be(s) != 0x38425053) {
+ stbi__rewind(s);
+ return 0;
+ }
+ if (stbi__get16be(s) != 1) {
+ stbi__rewind(s);
+ return 0;
+ }
+ stbi__skip(s, 6);
+ channelCount = stbi__get16be(s);
+ if (channelCount < 0 || channelCount > 16) {
+ stbi__rewind(s);
+ return 0;
+ }
+ *y = stbi__get32be(s);
+ *x = stbi__get32be(s);
+ if (stbi__get16be(s) != 8) {
+ stbi__rewind(s);
+ return 0;
+ }
+ if (stbi__get16be(s) != 3) {
+ stbi__rewind(s);
+ return 0;
+ }
+ *comp = 4;
+ return 1;
}
#endif
#ifndef STBI_NO_PIC
static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp)
{
- int act_comp=0,num_packets=0,chained,dummy;
- stbi__pic_packet packets[10];
+ int act_comp = 0, num_packets = 0, chained, dummy;
+ stbi__pic_packet packets[10];
- if (!x) x = &dummy;
- if (!y) y = &dummy;
- if (!comp) comp = &dummy;
+ if (!x)
+ x = &dummy;
+ if (!y)
+ y = &dummy;
+ if (!comp)
+ comp = &dummy;
- if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) {
- stbi__rewind(s);
- return 0;
- }
+ if (!stbi__pic_is4(s, "\x53\x80\xF6\x34")) {
+ stbi__rewind(s);
+ return 0;
+ }
- stbi__skip(s, 88);
+ stbi__skip(s, 88);
- *x = stbi__get16be(s);
- *y = stbi__get16be(s);
- if (stbi__at_eof(s)) {
- stbi__rewind( s);
- return 0;
- }
- if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) {
- stbi__rewind( s );
- return 0;
- }
+ *x = stbi__get16be(s);
+ *y = stbi__get16be(s);
+ if (stbi__at_eof(s)) {
+ stbi__rewind(s);
+ return 0;
+ }
+ if ((*x) != 0 && (1 << 28) / (*x) < (*y)) {
+ stbi__rewind(s);
+ return 0;
+ }
- stbi__skip(s, 8);
+ stbi__skip(s, 8);
- do {
- stbi__pic_packet *packet;
+ do {
+ stbi__pic_packet *packet;
- if (num_packets==sizeof(packets)/sizeof(packets[0]))
- return 0;
+ if (num_packets == sizeof(packets) / sizeof(packets[0]))
+ return 0;
- packet = &packets[num_packets++];
- chained = stbi__get8(s);
- packet->size = stbi__get8(s);
- packet->type = stbi__get8(s);
- packet->channel = stbi__get8(s);
- act_comp |= packet->channel;
+ packet = &packets[num_packets++];
+ chained = stbi__get8(s);
+ packet->size = stbi__get8(s);
+ packet->type = stbi__get8(s);
+ packet->channel = stbi__get8(s);
+ act_comp |= packet->channel;
- if (stbi__at_eof(s)) {
- stbi__rewind( s );
- return 0;
- }
- if (packet->size != 8) {
- stbi__rewind( s );
- return 0;
- }
- } while (chained);
+ if (stbi__at_eof(s)) {
+ stbi__rewind(s);
+ return 0;
+ }
+ if (packet->size != 8) {
+ stbi__rewind(s);
+ return 0;
+ }
+ } while (chained);
- *comp = (act_comp & 0x10 ? 4 : 3);
+ *comp = (act_comp & 0x10 ? 4 : 3);
- return 1;
+ return 1;
}
#endif
-// *************************************************************************************************
-// Portable Gray Map and Portable Pixel Map loader
-// by Ken Miller
-//
-// PGM: http://netpbm.sourceforge.net/doc/pgm.html
-// PPM: http://netpbm.sourceforge.net/doc/ppm.html
-//
-// Known limitations:
-// Does not support comments in the header section
-// Does not support ASCII image data (formats P2 and P3)
-// Does not support 16-bit-per-channel
+ // *************************************************************************************************
+ // Portable Gray Map and Portable Pixel Map loader
+ // by Ken Miller
+ //
+ // PGM: http://netpbm.sourceforge.net/doc/pgm.html
+ // PPM: http://netpbm.sourceforge.net/doc/ppm.html
+ //
+ // Known limitations:
+ // Does not support comments in the header section
+ // Does not support ASCII image data (formats P2 and P3)
+ // Does not support 16-bit-per-channel
#ifndef STBI_NO_PNM
-static int stbi__pnm_test(stbi__context *s)
+static int stbi__pnm_test(stbi__context *s)
{
- char p, t;
- p = (char) stbi__get8(s);
- t = (char) stbi__get8(s);
- if (p != 'P' || (t != '5' && t != '6')) {
- stbi__rewind( s );
- return 0;
- }
- return 1;
+ char p, t;
+ p = (char)stbi__get8(s);
+ t = (char)stbi__get8(s);
+ if (p != 'P' || (t != '5' && t != '6')) {
+ stbi__rewind(s);
+ return 0;
+ }
+ return 1;
}
-static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp, stbi__result_info *ri)
+static void *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp,
+ int req_comp, stbi__result_info *ri)
{
- stbi_uc *out;
- STBI_NOTUSED(ri);
+ stbi_uc *out;
+ STBI_NOTUSED(ri);
- if (!stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n))
- return 0;
+ if (!stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y,
+ (int *)&s->img_n))
+ return 0;
- *x = s->img_x;
- *y = s->img_y;
- if (comp) *comp = s->img_n;
+ *x = s->img_x;
+ *y = s->img_y;
+ if (comp)
+ *comp = s->img_n;
- if (!stbi__mad3sizes_valid(s->img_n, s->img_x, s->img_y, 0))
- return stbi__errpuc("too large", "PNM too large");
+ if (!stbi__mad3sizes_valid(s->img_n, s->img_x, s->img_y, 0))
+ return stbi__errpuc("too large", "PNM too large");
- out = (stbi_uc *) stbi__malloc_mad3(s->img_n, s->img_x, s->img_y, 0);
- if (!out) return stbi__errpuc("outofmem", "Out of memory");
- stbi__getn(s, out, s->img_n * s->img_x * s->img_y);
+ out = (stbi_uc *)stbi__malloc_mad3(s->img_n, s->img_x, s->img_y, 0);
+ if (!out)
+ return stbi__errpuc("outofmem", "Out of memory");
+ stbi__getn(s, out, s->img_n * s->img_x * s->img_y);
- if (req_comp && req_comp != s->img_n) {
- out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y);
- if (out == NULL) return out; // stbi__convert_format frees input on failure
- }
- return out;
+ if (req_comp && req_comp != s->img_n) {
+ out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y);
+ if (out == NULL)
+ return out; // stbi__convert_format frees input on failure
+ }
+ return out;
}
-static int stbi__pnm_isspace(char c)
+static int stbi__pnm_isspace(char c)
{
- return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r';
+ return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' ||
+ c == '\r';
}
-static void stbi__pnm_skip_whitespace(stbi__context *s, char *c)
+static void stbi__pnm_skip_whitespace(stbi__context *s, char *c)
{
- for (;;) {
- while (!stbi__at_eof(s) && stbi__pnm_isspace(*c))
- *c = (char) stbi__get8(s);
+ for (;;) {
+ while (!stbi__at_eof(s) && stbi__pnm_isspace(*c))
+ *c = (char)stbi__get8(s);
- if (stbi__at_eof(s) || *c != '#')
- break;
+ if (stbi__at_eof(s) || *c != '#')
+ break;
- while (!stbi__at_eof(s) && *c != '\n' && *c != '\r' )
- *c = (char) stbi__get8(s);
- }
+ while (!stbi__at_eof(s) && *c != '\n' && *c != '\r')
+ *c = (char)stbi__get8(s);
+ }
}
-static int stbi__pnm_isdigit(char c)
+static int stbi__pnm_isdigit(char c)
{
- return c >= '0' && c <= '9';
+ return c >= '0' && c <= '9';
}
-static int stbi__pnm_getinteger(stbi__context *s, char *c)
+static int stbi__pnm_getinteger(stbi__context *s, char *c)
{
- int value = 0;
+ int value = 0;
- while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) {
- value = value*10 + (*c - '0');
- *c = (char) stbi__get8(s);
- }
+ while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) {
+ value = value * 10 + (*c - '0');
+ *c = (char)stbi__get8(s);
+ }
- return value;
+ return value;
}
-static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp)
+static int stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp)
{
- int maxv, dummy;
- char c, p, t;
+ int maxv, dummy;
+ char c, p, t;
- if (!x) x = &dummy;
- if (!y) y = &dummy;
- if (!comp) comp = &dummy;
+ if (!x)
+ x = &dummy;
+ if (!y)
+ y = &dummy;
+ if (!comp)
+ comp = &dummy;
- stbi__rewind(s);
+ stbi__rewind(s);
- // Get identifier
- p = (char) stbi__get8(s);
- t = (char) stbi__get8(s);
- if (p != 'P' || (t != '5' && t != '6')) {
- stbi__rewind(s);
- return 0;
- }
+ // Get identifier
+ p = (char)stbi__get8(s);
+ t = (char)stbi__get8(s);
+ if (p != 'P' || (t != '5' && t != '6')) {
+ stbi__rewind(s);
+ return 0;
+ }
- *comp = (t == '6') ? 3 : 1; // '5' is 1-component .pgm; '6' is 3-component .ppm
+ *comp =
+ (t == '6') ? 3 : 1; // '5' is 1-component .pgm; '6' is 3-component .ppm
- c = (char) stbi__get8(s);
- stbi__pnm_skip_whitespace(s, &c);
+ c = (char)stbi__get8(s);
+ stbi__pnm_skip_whitespace(s, &c);
- *x = stbi__pnm_getinteger(s, &c); // read width
- stbi__pnm_skip_whitespace(s, &c);
+ *x = stbi__pnm_getinteger(s, &c); // read width
+ stbi__pnm_skip_whitespace(s, &c);
- *y = stbi__pnm_getinteger(s, &c); // read height
- stbi__pnm_skip_whitespace(s, &c);
+ *y = stbi__pnm_getinteger(s, &c); // read height
+ stbi__pnm_skip_whitespace(s, &c);
- maxv = stbi__pnm_getinteger(s, &c); // read max value
+ maxv = stbi__pnm_getinteger(s, &c); // read max value
- if (maxv > 255)
- return stbi__err("max value > 255", "PPM image not 8-bit");
- else
- return 1;
+ if (maxv > 255)
+ return stbi__err("max value > 255", "PPM image not 8-bit");
+ else
+ return 1;
}
#endif
static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp)
{
- #ifndef STBI_NO_JPEG
- if (stbi__jpeg_info(s, x, y, comp)) return 1;
- #endif
+#ifndef STBI_NO_JPEG
+ if (stbi__jpeg_info(s, x, y, comp))
+ return 1;
+#endif
- #ifndef STBI_NO_PNG
- if (stbi__png_info(s, x, y, comp)) return 1;
- #endif
+#ifndef STBI_NO_PNG
+ if (stbi__png_info(s, x, y, comp))
+ return 1;
+#endif
- #ifndef STBI_NO_GIF
- if (stbi__gif_info(s, x, y, comp)) return 1;
- #endif
+#ifndef STBI_NO_GIF
+ if (stbi__gif_info(s, x, y, comp))
+ return 1;
+#endif
- #ifndef STBI_NO_BMP
- if (stbi__bmp_info(s, x, y, comp)) return 1;
- #endif
+#ifndef STBI_NO_BMP
+ if (stbi__bmp_info(s, x, y, comp))
+ return 1;
+#endif
- #ifndef STBI_NO_PSD
- if (stbi__psd_info(s, x, y, comp)) return 1;
- #endif
+#ifndef STBI_NO_PSD
+ if (stbi__psd_info(s, x, y, comp))
+ return 1;
+#endif
- #ifndef STBI_NO_PIC
- if (stbi__pic_info(s, x, y, comp)) return 1;
- #endif
+#ifndef STBI_NO_PIC
+ if (stbi__pic_info(s, x, y, comp))
+ return 1;
+#endif
- #ifndef STBI_NO_PNM
- if (stbi__pnm_info(s, x, y, comp)) return 1;
- #endif
+#ifndef STBI_NO_PNM
+ if (stbi__pnm_info(s, x, y, comp))
+ return 1;
+#endif
- #ifndef STBI_NO_HDR
- if (stbi__hdr_info(s, x, y, comp)) return 1;
- #endif
+#ifndef STBI_NO_HDR
+ if (stbi__hdr_info(s, x, y, comp))
+ return 1;
+#endif
- // test tga last because it's a crappy test!
- #ifndef STBI_NO_TGA
- if (stbi__tga_info(s, x, y, comp))
- return 1;
- #endif
- return stbi__err("unknown image type", "Image not of any known type, or corrupt");
+// test tga last because it's a crappy test!
+#ifndef STBI_NO_TGA
+ if (stbi__tga_info(s, x, y, comp))
+ return 1;
+#endif
+ return stbi__err("unknown image type",
+ "Image not of any known type, or corrupt");
}
#ifndef STBI_NO_STDIO
@@ -6933,7 +7946,8 @@ STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp)
{
FILE *f = stbi__fopen(filename, "rb");
int result;
- if (!f) return stbi__err("can't fopen", "Unable to open file");
+ if (!f)
+ return stbi__err("can't fopen", "Unable to open file");
result = stbi_info_from_file(f, x, y, comp);
fclose(f);
return result;
@@ -6941,28 +7955,30 @@ STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp)
STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp)
{
- int r;
- stbi__context s;
- long pos = ftell(f);
- stbi__start_file(&s, f);
- r = stbi__info_main(&s,x,y,comp);
- fseek(f,pos,SEEK_SET);
- return r;
+ int r;
+ stbi__context s;
+ long pos = ftell(f);
+ stbi__start_file(&s, f);
+ r = stbi__info_main(&s, x, y, comp);
+ fseek(f, pos, SEEK_SET);
+ return r;
}
#endif // !STBI_NO_STDIO
-STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp)
+STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x,
+ int *y, int *comp)
{
- stbi__context s;
- stbi__start_mem(&s,buffer,len);
- return stbi__info_main(&s,x,y,comp);
+ stbi__context s;
+ stbi__start_mem(&s, buffer, len);
+ return stbi__info_main(&s, x, y, comp);
}
-STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp)
+STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user,
+ int *x, int *y, int *comp)
{
- stbi__context s;
- stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user);
- return stbi__info_main(&s,x,y,comp);
+ stbi__context s;
+ stbi__start_callbacks(&s, (stbi_io_callbacks *)c, user);
+ return stbi__info_main(&s, x, y, comp);
}
#endif // STB_IMAGE_IMPLEMENTATION
@@ -6980,13 +7996,11 @@ STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int
warning fixes; disable run-time SSE detection on gcc;
uniform handling of optional "return" values;
thread-safe initialization of zlib tables
- 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet JPGs
- 2.13 (2016-11-29) add 16-bit API, only supported for PNG right now
- 2.12 (2016-04-02) fix typo in 2.11 PSD fix that caused crashes
- 2.11 (2016-04-02) allocate large structures on the stack
- remove white matting for transparent PSD
- fix reported channel count for PNG & BMP
- re-enable SSE2 in non-gcc 64-bit
+ 2.14 (2017-03-03) remove deprecated STBI_JPEG_OLD; fixes for Imagenet
+ JPGs 2.13 (2016-11-29) add 16-bit API, only supported for PNG right now 2.12
+ (2016-04-02) fix typo in 2.11 PSD fix that caused crashes 2.11 (2016-04-02)
+ allocate large structures on the stack remove white matting for transparent
+ PSD fix reported channel count for PNG & BMP re-enable SSE2 in non-gcc 64-bit
support RGB-formatted JPEG
read 16-bit PNGs (only as 8-bit)
2.10 (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED
@@ -6994,11 +8008,9 @@ STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int
16-bit-per-pixel TGA (not bit-per-component)
info() for TGA could break due to .hdr handling
info() for BMP to shares code instead of sloppy parse
- can use STBI_REALLOC_SIZED if allocator doesn't support realloc
- code cleanup
- 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA
- 2.07 (2015-09-13) fix compiler warnings
- partial animated GIF support
+ can use STBI_REALLOC_SIZED if allocator doesn't support
+ realloc code cleanup 2.08 (2015-09-13) fix to 2.07 cleanup, reading RGB PSD
+ as RGBA 2.07 (2015-09-13) fix compiler warnings partial animated GIF support
limited 16-bpc PSD support
#ifdef unused functions
bug with < 92 byte PIC,PNM,HDR,TGA
@@ -7009,23 +8021,18 @@ STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int
stbi_set_flip_vertically_on_load (nguillemot)
fix NEON support; fix mingw support
2.02 (2015-01-19) fix incorrect assert, fix warning
- 2.01 (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2
- 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG
- 2.00 (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg)
- progressive JPEG (stb)
- PGM/PPM support (Ken Miller)
- STBI_MALLOC,STBI_REALLOC,STBI_FREE
+ 2.01 (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit
+ without -msse2 2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG 2.00
+ (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg) progressive
+ JPEG (stb) PGM/PPM support (Ken Miller) STBI_MALLOC,STBI_REALLOC,STBI_FREE
GIF bugfix -- seemingly never worked
STBI_NO_*, STBI_ONLY_*
1.48 (2014-12-14) fix incorrectly-named assert()
- 1.47 (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb)
- optimize PNG (ryg)
- fix bug in interlaced PNG with user-specified channel count (stb)
- 1.46 (2014-08-26)
- fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG
- 1.45 (2014-08-16)
- fix MSVC-ARM internal compiler error by wrapping malloc
- 1.44 (2014-08-07)
+ 1.47 (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar
+ Cornut & stb) optimize PNG (ryg) fix bug in interlaced PNG with
+ user-specified channel count (stb) 1.46 (2014-08-26) fix broken tRNS chunk
+ (colorkey-style transparency) in non-paletted PNG 1.45 (2014-08-16) fix
+ MSVC-ARM internal compiler error by wrapping malloc 1.44 (2014-08-07)
various warning fixes from Ronny Chevalier
1.43 (2014-07-15)
fix MSVC-only compiler problem in code changed in 1.42
@@ -7034,73 +8041,48 @@ STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int
fixes to stbi__cleanup_jpeg path
added STBI_ASSERT to avoid requiring assert.h
1.41 (2014-06-25)
- fix search&replace from 1.36 that messed up comments/error messages
- 1.40 (2014-06-22)
- fix gcc struct-initialization warning
- 1.39 (2014-06-15)
- fix to TGA optimization when req_comp != number of components in TGA;
- fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite)
- add support for BMP version 5 (more ignored fields)
- 1.38 (2014-06-06)
- suppress MSVC warnings on integer casts truncating values
- fix accidental rename of 'skip' field of I/O
- 1.37 (2014-06-04)
- remove duplicate typedef
- 1.36 (2014-06-03)
- convert to header file single-file library
- if de-iphone isn't set, load iphone images color-swapped instead of returning NULL
- 1.35 (2014-05-27)
- various warnings
- fix broken STBI_SIMD path
- fix bug where stbi_load_from_file no longer left file pointer in correct place
- fix broken non-easy path for 32-bit BMP (possibly never used)
- TGA optimization by Arseny Kapoulkine
- 1.34 (unknown)
- use STBI_NOTUSED in stbi__resample_row_generic(), fix one more leak in tga failure case
- 1.33 (2011-07-14)
- make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements
- 1.32 (2011-07-13)
- support for "info" function for all supported filetypes (SpartanJ)
- 1.31 (2011-06-20)
- a few more leak fixes, bug in PNG handling (SpartanJ)
- 1.30 (2011-06-11)
- added ability to load files via callbacks to accomidate custom input streams (Ben Wenger)
+ fix search&replace from 1.36 that messed up comments/error
+ messages 1.40 (2014-06-22) fix gcc struct-initialization warning 1.39
+ (2014-06-15) fix to TGA optimization when req_comp != number of components in
+ TGA; fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my
+ test suite) add support for BMP version 5 (more ignored fields) 1.38
+ (2014-06-06) suppress MSVC warnings on integer casts truncating values fix
+ accidental rename of 'skip' field of I/O 1.37 (2014-06-04) remove duplicate
+ typedef 1.36 (2014-06-03) convert to header file single-file library if
+ de-iphone isn't set, load iphone images color-swapped instead of returning
+ NULL 1.35 (2014-05-27) various warnings fix broken STBI_SIMD path fix bug
+ where stbi_load_from_file no longer left file pointer in correct place fix
+ broken non-easy path for 32-bit BMP (possibly never used) TGA optimization by
+ Arseny Kapoulkine 1.34 (unknown) use STBI_NOTUSED in
+ stbi__resample_row_generic(), fix one more leak in tga failure case 1.33
+ (2011-07-14) make stbi_is_hdr work in STBI_NO_HDR (as specified), minor
+ compiler-friendly improvements 1.32 (2011-07-13) support for "info" function
+ for all supported filetypes (SpartanJ) 1.31 (2011-06-20) a few more leak
+ fixes, bug in PNG handling (SpartanJ) 1.30 (2011-06-11) added ability to
+ load files via callbacks to accomidate custom input streams (Ben Wenger)
removed deprecated format-specific test/load functions
- removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway
- error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha)
- fix inefficiency in decoding 32-bit BMP (David Woo)
- 1.29 (2010-08-16)
- various warning fixes from Aurelien Pocheville
- 1.28 (2010-08-01)
- fix bug in GIF palette transparency (SpartanJ)
- 1.27 (2010-08-01)
- cast-to-stbi_uc to fix warnings
- 1.26 (2010-07-24)
- fix bug in file buffering for PNG reported by SpartanJ
- 1.25 (2010-07-17)
- refix trans_data warning (Won Chun)
- 1.24 (2010-07-12)
- perf improvements reading from files on platforms with lock-heavy fgetc()
- minor perf improvements for jpeg
- deprecated type-specific functions so we'll get feedback if they're needed
- attempt to fix trans_data warning (Won Chun)
- 1.23 fixed bug in iPhone support
- 1.22 (2010-07-10)
- removed image *writing* support
- stbi_info support from Jetro Lauha
- GIF support from Jean-Marc Lienher
+ removed support for installable file formats (stbi_loader) --
+ would have been broken for IO callbacks anyway error cases in bmp and tga
+ give messages and don't leak (Raymond Barbiero, grisha) fix inefficiency in
+ decoding 32-bit BMP (David Woo) 1.29 (2010-08-16) various warning fixes from
+ Aurelien Pocheville 1.28 (2010-08-01) fix bug in GIF palette transparency
+ (SpartanJ) 1.27 (2010-08-01) cast-to-stbi_uc to fix warnings 1.26
+ (2010-07-24) fix bug in file buffering for PNG reported by SpartanJ 1.25
+ (2010-07-17) refix trans_data warning (Won Chun) 1.24 (2010-07-12) perf
+ improvements reading from files on platforms with lock-heavy fgetc() minor
+ perf improvements for jpeg deprecated type-specific functions so we'll get
+ feedback if they're needed attempt to fix trans_data warning (Won Chun) 1.23
+ fixed bug in iPhone support 1.22 (2010-07-10) removed image *writing*
+ support stbi_info support from Jetro Lauha GIF support from Jean-Marc Lienher
iPhone PNG-extensions from James Brown
- warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err. Janez (U+017D)emva)
- 1.21 fix use of 'stbi_uc' in header (reported by jon blow)
- 1.20 added support for Softimage PIC, by Tom Seddon
- 1.19 bug in interlaced PNG corruption check (found by ryg)
- 1.18 (2008-08-02)
- fix a threading bug (local mutable static)
- 1.17 support interlaced PNG
- 1.16 major bugfix - stbi__convert_format converted one too many pixels
- 1.15 initialize some fields for thread safety
- 1.14 fix threadsafe conversion bug
- header-file-only version (#define STBI_HEADER_FILE_ONLY before including)
+ warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err.
+ Janez (U+017D)emva) 1.21 fix use of 'stbi_uc' in header (reported by jon
+ blow) 1.20 added support for Softimage PIC, by Tom Seddon 1.19 bug in
+ interlaced PNG corruption check (found by ryg) 1.18 (2008-08-02) fix a
+ threading bug (local mutable static) 1.17 support interlaced PNG 1.16
+ major bugfix - stbi__convert_format converted one too many pixels 1.15
+ initialize some fields for thread safety 1.14 fix threadsafe conversion
+ bug header-file-only version (#define STBI_HEADER_FILE_ONLY before including)
1.13 threadsafe
1.12 const qualifiers in the API
1.11 Support installable IDCT, colorspace conversion routines
@@ -7110,29 +8092,26 @@ STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int
1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz
1.07 attempt to fix C++ warning/errors again
1.06 attempt to fix C++ warning/errors again
- 1.05 fix TGA loading to return correct *comp and use good luminance calc
- 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free
- 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR
- 1.02 support for (subset of) HDR files, float interface for preferred access to them
- 1.01 fix bug: possible bug in handling right-side up bmps... not sure
- fix bug: the stbi__bmp_load() and stbi__tga_load() functions didn't work at all
- 1.00 interface to zlib that skips zlib header
- 0.99 correct handling of alpha in palette
- 0.98 TGA loader by lonesock; dynamically add loaders (untested)
- 0.97 jpeg errors on too large a file; also catch another malloc failure
- 0.96 fix detection of invalid v value - particleman@mollyrocket forum
- 0.95 during header scan, seek to markers in case of padding
- 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same
- 0.93 handle jpegtran output; verbose errors
- 0.92 read 4,8,16,24,32-bit BMP files of several formats
- 0.91 output 24-bit Windows 3.0 BMP files
- 0.90 fix a few more warnings; bump version number to approach 1.0
- 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd
- 0.60 fix compiling as c++
- 0.59 fix warnings: merge Dave Moore's -Wall fixes
+ 1.05 fix TGA loading to return correct *comp and use good luminance
+ calc 1.04 default float alpha is 1, not 255; use 'void *' for
+ stbi_image_free 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR 1.02
+ support for (subset of) HDR files, float interface for preferred access to
+ them 1.01 fix bug: possible bug in handling right-side up bmps... not sure
+ fix bug: the stbi__bmp_load() and stbi__tga_load() functions
+ didn't work at all 1.00 interface to zlib that skips zlib header 0.99
+ correct handling of alpha in palette 0.98 TGA loader by lonesock;
+ dynamically add loaders (untested) 0.97 jpeg errors on too large a file;
+ also catch another malloc failure 0.96 fix detection of invalid v value -
+ particleman@mollyrocket forum 0.95 during header scan, seek to markers in
+ case of padding 0.94 STBI_NO_STDIO to disable stdio usage; rename all
+ #defines the same 0.93 handle jpegtran output; verbose errors 0.92 read
+ 4,8,16,24,32-bit BMP files of several formats 0.91 output 24-bit
+ Windows 3.0 BMP files 0.90 fix a few more warnings; bump version number to
+ approach 1.0 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd 0.60
+ fix compiling as c++ 0.59 fix warnings: merge Dave Moore's -Wall fixes
0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian
- 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available
- 0.56 fix bug: zlib uncompressed mode len vs. nlen
+ 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but
+ less than 16 available 0.56 fix bug: zlib uncompressed mode len vs. nlen
0.55 fix bug: restart_interval not initialized to 0
0.54 allow NULL for 'int *comp'
0.53 fix bug in png 3->4; speedup png decoding
@@ -7143,7 +8122,6 @@ STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int
first released version
*/
-
/*
------------------------------------------------------------------------------
This software is available under 2 licenses -- choose whichever you prefer.
diff --git a/yage/core/window.cpp b/yage/core/window.cpp
index 711e1294..84cd66d7 100644
--- a/yage/core/window.cpp
+++ b/yage/core/window.cpp
@@ -9,8 +9,8 @@
#include "window.h"
#include "../data/input.h"
-#include <glad/glad.h>
#include <GLFW/glfw3.h>
+#include <glad/glad.h>
#include <stdexcept>
@@ -19,7 +19,8 @@ using std::runtime_error;
namespace yage
{
-namespace {
+namespace
+{
void key_callback(GLFWwindow *window, int key, int scanCode, int action,
int mods)
@@ -71,13 +72,9 @@ void Window::create(std::string window_name, int width, int height)
// set vsync on
glfwSwapInterval(1);
- // set the clear colour to black
- glClearColor(0.18f, 0.18f, 0.18f, 1.f);
// set alpha blending
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- // set the clear depth
- glClearDepth(1.f);
}
void Window::swapBuffer()
@@ -88,6 +85,10 @@ void Window::swapBuffer()
void Window::clearBuffer()
{
+ // set the clear colour to black
+ glClearColor(0.18f, 0.18f, 0.18f, 1.f);
+ // set the clear depth
+ glClearDepth(1.f);
// clears buffer with clear colour
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
diff --git a/yage/engine/engine.cpp b/yage/engine/engine.cpp
new file mode 100644
index 00000000..3918e7e9
--- /dev/null
+++ b/yage/engine/engine.cpp
@@ -0,0 +1,52 @@
+/** ---------------------------------------------------------------------------
+ * @file: engine.cpp
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
+#include "engine.h"
+
+#include "../core/window.h"
+
+namespace yage
+{
+
+void Engine::mainLoop()
+{
+ Window window;
+
+ window.create("Game Engine", 800, 640);
+
+ while(!window.shouldClose()) {
+ window.clearBuffer();
+
+ update();
+
+ window.swapBuffer();
+ }
+}
+
+void Engine::update()
+{
+ const double dt = 1.0 / 60.0;
+
+ for(auto &&system : systems_) {
+ system->update(dt);
+ }
+}
+
+void Engine::addSystem(System *system)
+{
+ systems_.push_back(system);
+}
+
+Engine &Engine::instance()
+{
+ static Engine engine_instance;
+
+ return engine_instance;
+}
+
+} // namespace yage
diff --git a/yage/engine/engine.h b/yage/engine/engine.h
new file mode 100644
index 00000000..dabe5596
--- /dev/null
+++ b/yage/engine/engine.h
@@ -0,0 +1,44 @@
+/** ---------------------------------------------------------------------------
+ * @file: engine.h
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
+#ifndef YAGE_CORE_ENGINE_H
+#define YAGE_CORE_ENGINE_H
+
+#include "system.h"
+
+#include <vector>
+
+namespace yage
+{
+
+/// Main engine class that contains a systems, the main loop and the update
+/// function that updates all the systems.
+class Engine
+{
+public:
+ /// Main game loop of the engine.
+ void mainLoop();
+
+ /// Updates the systems.
+ void update();
+
+ /// Adds a system to the engine.
+ void addSystem(System *system);
+
+ /// Returns the instance of the engine, as there is only one instance of the
+ /// engine.
+ static Engine &instance();
+
+private:
+ /// Vector of all the systems in the engine.
+ std::vector<System *> systems_;
+};
+
+} // namespace yage
+
+#endif
diff --git a/yage/engine/system.h b/yage/engine/system.h
new file mode 100644
index 00000000..c63b4733
--- /dev/null
+++ b/yage/engine/system.h
@@ -0,0 +1,39 @@
+/** ---------------------------------------------------------------------------
+ * @file: system.h
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
+#ifndef YAGE_ENGINE_SYSTEM_H
+#define YAGE_ENGINE_SYSTEM_H
+
+namespace yage
+{
+
+/**
+ * System interface for the different systems in the engine.
+ */
+class System
+{
+public:
+ /// Virtual destructor to destroy all the objects that implement this
+ /// properly.
+ virtual ~System() = 0;
+
+ /// Initializes the system. Good practice to have this function instead
+ /// using the constructor.
+ virtual void init() = 0;
+
+ /// Updates the system at each interval using the time step.
+ virtual void update(double dt) = 0;
+};
+
+/// Implement the default destructor, but leaving it as purely virtual in the
+/// definition of the abstract class.
+inline yage::System::~System() {}
+
+} // namespace yage
+
+#endif
diff --git a/yage/render/batch.h b/yage/render/batch.h
index 6694fbcb..45bf4b31 100644
--- a/yage/render/batch.h
+++ b/yage/render/batch.h
@@ -1,3 +1,11 @@
+/** ---------------------------------------------------------------------------
+ * @file: batch.h
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
#ifndef YAGE_CORE_BATCH_H
#define YAGE_CORE_BATCH_H
diff --git a/yage/render/drawable.h b/yage/render/drawable.h
index c126bb09..774aa451 100644
--- a/yage/render/drawable.h
+++ b/yage/render/drawable.h
@@ -1,3 +1,11 @@
+/** ---------------------------------------------------------------------------
+ * @file: drawable.h
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
#ifndef YAGE_CORE_DRAWABLE_H
#define YAGE_CORE_DRAWABLE_H
diff --git a/yage/render/ellipse.h b/yage/render/ellipse.h
index bd0b0d3e..2a7552ba 100644
--- a/yage/render/ellipse.h
+++ b/yage/render/ellipse.h
@@ -1,6 +1,12 @@
+/** ---------------------------------------------------------------------------
+ * @file: ellipse.h
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
#ifndef YAGE_RENDER_ELLIPSE_H
#define YAGE_RENDER_ELLIPSE_H
-
-
#endif
diff --git a/yage/render/rectangle.cpp b/yage/render/rectangle.cpp
index 632c7ceb..f48f79db 100644
--- a/yage/render/rectangle.cpp
+++ b/yage/render/rectangle.cpp
@@ -1,3 +1,11 @@
+/** ---------------------------------------------------------------------------
+ * @file: rectangle.cpp
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
#include "rectangle.h"
#include "../data/vertex.h"
@@ -29,10 +37,10 @@ void Rectangle::render() const
glEnableVertexAttribArray(1);
// set the vertex attribute pointers
- glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *)offsetof(Vertex, position));
+ glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex),
+ (void *)offsetof(Vertex, position));
glBindVertexArray(0);
}
} // namepsace yage
-
diff --git a/yage/render/rectangle.h b/yage/render/rectangle.h
index ad38caa5..bf87731b 100644
--- a/yage/render/rectangle.h
+++ b/yage/render/rectangle.h
@@ -1,3 +1,11 @@
+/** ---------------------------------------------------------------------------
+ * @file: rectangle.h
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
#ifndef YAGE_RENDER_RECTANGLE_H
#define YAGE_RENDER_RECTANGLE_H
diff --git a/yage/render/shader.h b/yage/render/shader.h
index 7f4d2f9d..086b7b70 100644
--- a/yage/render/shader.h
+++ b/yage/render/shader.h
@@ -9,8 +9,8 @@
#ifndef YAGE_RENDER_SHADER_H
#define YAGE_RENDER_SHADER_H
-#include <glm/glm.hpp>
#include <glad/glad.h>
+#include <glm/glm.hpp>
#include <string>
diff --git a/yage/render/shape.h b/yage/render/shape.h
index 1fdf1c4f..0ac72ba8 100644
--- a/yage/render/shape.h
+++ b/yage/render/shape.h
@@ -1,3 +1,11 @@
+/** ---------------------------------------------------------------------------
+ * @file: shape.h
+ *
+ * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com>
+ * MIT License, see LICENSE file for more details.
+ * ----------------------------------------------------------------------------
+ */
+
#ifndef YAGE_RENDER_SHAPE_H
#define YAGE_RENDER_SHAPE_H
diff --git a/yage/render/spritebatch.cpp b/yage/render/spritebatch.cpp
index 90958246..25ad6da4 100644
--- a/yage/render/spritebatch.cpp
+++ b/yage/render/spritebatch.cpp
@@ -114,7 +114,7 @@ void SpriteBatch::render()
glActiveTexture(GL_TEXTURE0);
for (auto &&batch : render_batches_) {
yLogDebug << "Drawing " << batch.num_vertices
- << " vertices bound to texture: " << batch.texture;
+ << " vertices bound to texture: " << batch.texture;
glBindTexture(GL_TEXTURE_2D, batch.texture);
glDrawArrays(GL_TRIANGLES, batch.offset, batch.num_vertices);
}
diff --git a/yage/yage.h b/yage/yage.h
index 0f75adb3..c4b5612b 100644
--- a/yage/yage.h
+++ b/yage/yage.h
@@ -23,9 +23,9 @@
#include "physics/particlebody.h"
#include "physics/rectanglecollider.h"
#include "physics/rigidbody.h"
+#include "render/drawable.h"
#include "render/shader.h"
#include "render/spritebatch.h"
-#include "render/drawable.h"
/** Project namespace.
*