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@@ -1,5 +1,5 @@
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-/* stb_image_write - v1.05 - public domain - http://nothings.org/stb/stb_image_write.h
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- writes out PNG/BMP/TGA images to C stdio - Sean Barrett 2010-2015
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+/* stb_image_write - v1.08 - public domain - http://nothings.org/stb/stb_image_write.h
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+ writes out PNG/BMP/TGA/JPEG/HDR images to C stdio - Sean Barrett 2010-2015
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no warranty implied; use at your own risk
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Before #including,
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@@ -10,43 +10,64 @@
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Will probably not work correctly with strict-aliasing optimizations.
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+ If using a modern Microsoft Compiler, non-safe versions of CRT calls may cause
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+ compilation warnings or even errors. To avoid this, also before #including,
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+
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+ #define STBI_MSC_SECURE_CRT
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+
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ABOUT:
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This header file is a library for writing images to C stdio. It could be
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adapted to write to memory or a general streaming interface; let me know.
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The PNG output is not optimal; it is 20-50% larger than the file
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- written by a decent optimizing implementation. This library is designed
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- for source code compactness and simplicity, not optimal image file size
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- or run-time performance.
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+ written by a decent optimizing implementation; though providing a custom
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+ zlib compress function (see STBIW_ZLIB_COMPRESS) can mitigate that.
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+ This library is designed for source code compactness and simplicity,
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+ not optimal image file size or run-time performance.
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BUILDING:
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You can #define STBIW_ASSERT(x) before the #include to avoid using assert.h.
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You can #define STBIW_MALLOC(), STBIW_REALLOC(), and STBIW_FREE() to replace
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malloc,realloc,free.
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- You can define STBIW_MEMMOVE() to replace memmove()
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+ You can #define STBIW_MEMMOVE() to replace memmove()
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+ You can #define STBIW_ZLIB_COMPRESS to use a custom zlib-style compress function
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+ for PNG compression (instead of the builtin one), it must have the following signature:
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+ unsigned char * my_compress(unsigned char *data, int data_len, int *out_len, int quality);
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+ The returned data will be freed with STBIW_FREE() (free() by default),
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+ so it must be heap allocated with STBIW_MALLOC() (malloc() by default),
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USAGE:
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- There are four functions, one for each image file format:
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+ There are five functions, one for each image file format:
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int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes);
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int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data);
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int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data);
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int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data);
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+ int stbi_write_jpg(char const *filename, int w, int h, int comp, const float *data, int quality);
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+
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+ void stbi_flip_vertically_on_write(int flag); // flag is non-zero to flip data vertically
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- There are also four equivalent functions that use an arbitrary write function. You are
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+ There are also five equivalent functions that use an arbitrary write function. You are
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expected to open/close your file-equivalent before and after calling these:
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int stbi_write_png_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data, int stride_in_bytes);
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int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data);
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int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data);
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int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data);
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+ int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality);
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where the callback is:
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void stbi_write_func(void *context, void *data, int size);
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+ You can configure it with these global variables:
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+ int stbi_write_tga_with_rle; // defaults to true; set to 0 to disable RLE
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+ int stbi_write_png_compression_level; // defaults to 8; set to higher for more compression
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+ int stbi_write_force_png_filter; // defaults to -1; set to 0..5 to force a filter mode
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+
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+
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You can define STBI_WRITE_NO_STDIO to disable the file variant of these
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functions, so the library will not use stdio.h at all. However, this will
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also disable HDR writing, because it requires stdio for formatted output.
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@@ -73,27 +94,33 @@ USAGE:
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writer, both because it is in BGR order and because it may have padding
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at the end of the line.)
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+ PNG allows you to set the deflate compression level by setting the global
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+ variable 'stbi_write_png_level' (it defaults to 8).
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+
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HDR expects linear float data. Since the format is always 32-bit rgb(e)
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data, alpha (if provided) is discarded, and for monochrome data it is
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replicated across all three channels.
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TGA supports RLE or non-RLE compressed data. To use non-RLE-compressed
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data, set the global variable 'stbi_write_tga_with_rle' to 0.
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+
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+ JPEG does ignore alpha channels in input data; quality is between 1 and 100.
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+ Higher quality looks better but results in a bigger image.
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+ JPEG baseline (no JPEG progressive).
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CREDITS:
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- PNG/BMP/TGA
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- Sean Barrett
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- HDR
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- Baldur Karlsson
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- TGA monochrome:
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- Jean-Sebastien Guay
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- misc enhancements:
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- Tim Kelsey
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- TGA RLE
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- Alan Hickman
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- initial file IO callback implementation
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- Emmanuel Julien
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+
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+ Sean Barrett - PNG/BMP/TGA
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+ Baldur Karlsson - HDR
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+ Jean-Sebastien Guay - TGA monochrome
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+ Tim Kelsey - misc enhancements
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+ Alan Hickman - TGA RLE
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+ Emmanuel Julien - initial file IO callback implementation
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+ Jon Olick - original jo_jpeg.cpp code
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+ Daniel Gibson - integrate JPEG, allow external zlib
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+ Aarni Koskela - allow choosing PNG filter
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+
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bugfixes:
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github:Chribba
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Guillaume Chereau
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@@ -105,6 +132,7 @@ CREDITS:
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Thatcher Ulrich
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github:poppolopoppo
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Patrick Boettcher
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+ github:xeekworx
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LICENSE
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@@ -123,14 +151,18 @@ extern "C" {
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#define STBIWDEF static
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#else
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#define STBIWDEF extern
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-extern int stbi_write_tga_with_rle;
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#endif
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+STBIWDEF int stbi_write_tga_with_rle;
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+STBIWDEF int stbi_write_png_comperssion_level;
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+STBIWDEF int stbi_write_force_png_filter;
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+
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#ifndef STBI_WRITE_NO_STDIO
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STBIWDEF int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes);
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STBIWDEF int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data);
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STBIWDEF int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data);
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STBIWDEF int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data);
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+STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const void *data, int quality);
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#endif
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typedef void stbi_write_func(void *context, void *data, int size);
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@@ -139,6 +171,9 @@ STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int w,
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STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data);
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STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data);
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STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data);
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+STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality);
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+
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+STBIWDEF void stbi_flip_vertically_on_write(int flip_boolean);
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#ifdef __cplusplus
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}
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@@ -197,6 +232,23 @@ STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w,
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#define STBIW_UCHAR(x) (unsigned char) ((x) & 0xff)
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+#ifdef STB_IMAGE_WRITE_STATIC
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+static stbi__flip_vertically_on_write=0;
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+static int stbi_write_png_compression level = 8;
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+static int stbi_write_tga_with_rle = 1;
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+static int stbi_write_force_png_filter = -1;
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+#else
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+int stbi_write_png_compression_level = 8;
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+int stbi__flip_vertically_on_write=0;
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+int stbi_write_tga_with_rle = 1;
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+int stbi_write_force_png_filter = -1;
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+#endif
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+
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+STBIWDEF void stbi_flip_vertically_on_write(int flag)
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+{
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+ stbi__flip_vertically_on_write = flag;
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+}
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+
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typedef struct
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{
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stbi_write_func *func;
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@@ -219,7 +271,12 @@ static void stbi__stdio_write(void *context, void *data, int size)
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static int stbi__start_write_file(stbi__write_context *s, const char *filename)
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{
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- FILE *f = fopen(filename, "wb");
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+ FILE *f;
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+#ifdef STBI_MSC_SECURE_CRT
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+ fopen_s(&f, filename, "wb");
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+#else
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+ f = fopen(filename, "wb");
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+#endif
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stbi__start_write_callbacks(s, stbi__stdio_write, (void *) f);
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return f != NULL;
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}
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@@ -234,12 +291,6 @@ static void stbi__end_write_file(stbi__write_context *s)
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typedef unsigned int stbiw_uint32;
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typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1];
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-#ifdef STB_IMAGE_WRITE_STATIC
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-static int stbi_write_tga_with_rle = 1;
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-#else
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-int stbi_write_tga_with_rle = 1;
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-#endif
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-
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static void stbiw__writefv(stbi__write_context *s, const char *fmt, va_list v)
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{
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while (*fmt) {
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@@ -277,6 +328,11 @@ static void stbiw__writef(stbi__write_context *s, const char *fmt, ...)
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va_end(v);
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}
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+static void stbiw__putc(stbi__write_context *s, unsigned char c)
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+{
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+ s->func(s->context, &c, 1);
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+}
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+
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static void stbiw__write3(stbi__write_context *s, unsigned char a, unsigned char b, unsigned char c)
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{
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unsigned char arr[3];
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@@ -325,6 +381,9 @@ static void stbiw__write_pixels(stbi__write_context *s, int rgb_dir, int vdir, i
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if (y <= 0)
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return;
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+ if (stbi__flip_vertically_on_write)
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+ vdir *= -1;
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+
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if (vdir < 0)
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j_end = -1, j = y-1;
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else
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@@ -396,11 +455,21 @@ static int stbi_write_tga_core(stbi__write_context *s, int x, int y, int comp, v
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"111 221 2222 11", 0, 0, format, 0, 0, 0, 0, 0, x, y, (colorbytes + has_alpha) * 8, has_alpha * 8);
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} else {
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int i,j,k;
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+ int jend, jdir;
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stbiw__writef(s, "111 221 2222 11", 0,0,format+8, 0,0,0, 0,0,x,y, (colorbytes + has_alpha) * 8, has_alpha * 8);
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- for (j = y - 1; j >= 0; --j) {
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- unsigned char *row = (unsigned char *) data + j * x * comp;
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+ if (stbi__flip_vertically_on_write) {
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+ j = 0;
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+ jend = y;
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+ jdir = 1;
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+ } else {
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+ j = y-1;
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+ jend = -1;
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+ jdir = -1;
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+ }
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+ for (; j != jend; j += jdir) {
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+ unsigned char *row = (unsigned char *) data + j * x * comp;
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int len;
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for (i = 0; i < x; i += len) {
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@@ -450,7 +519,7 @@ static int stbi_write_tga_core(stbi__write_context *s, int x, int y, int comp, v
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return 1;
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}
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-int stbi_write_tga_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data)
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+STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data)
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{
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stbi__write_context s;
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stbi__start_write_callbacks(&s, func, context);
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@@ -458,7 +527,7 @@ int stbi_write_tga_to_func(stbi_write_func *func, void *context, int x, int y, i
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}
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#ifndef STBI_WRITE_NO_STDIO
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-int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data)
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+STBIWDEF int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data)
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{
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stbi__write_context s;
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if (stbi__start_write_file(&s,filename)) {
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@@ -610,17 +679,21 @@ static int stbi_write_hdr_core(stbi__write_context *s, int x, int y, int comp, f
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char header[] = "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n";
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s->func(s->context, header, sizeof(header)-1);
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+#ifdef STBI_MSC_SECURE_CRT
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+ len = sprintf_s(buffer, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x);
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+#else
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len = sprintf(buffer, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x);
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+#endif
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s->func(s->context, buffer, len);
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for(i=0; i < y; i++)
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- stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp*i*x);
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+ stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp*x*(stbi__flip_vertically_on_write ? y-1-i : i)*x);
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STBIW_FREE(scratch);
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return 1;
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}
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}
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-int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const float *data)
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+STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const float *data)
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{
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stbi__write_context s;
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stbi__start_write_callbacks(&s, func, context);
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@@ -628,7 +701,7 @@ int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int x, int y, i
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}
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#ifndef STBI_WRITE_NO_STDIO
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-int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *data)
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+STBIWDEF int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *data)
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{
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stbi__write_context s;
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if (stbi__start_write_file(&s,filename)) {
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@@ -646,6 +719,7 @@ int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *da
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// PNG writer
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//
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+#ifndef STBIW_ZLIB_COMPRESS
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// stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size()
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#define stbiw__sbraw(a) ((int *) (a) - 2)
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#define stbiw__sbm(a) stbiw__sbraw(a)[0]
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@@ -726,8 +800,14 @@ static unsigned int stbiw__zhash(unsigned char *data)
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#define stbiw__ZHASH 16384
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+#endif // STBIW_ZLIB_COMPRESS
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+
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unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality)
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{
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+#ifdef STBIW_ZLIB_COMPRESS
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+ // user provided a zlib compress implementation, use that
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+ return STBIW_ZLIB_COMPRESS(data, data_len, out_len, quality);
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+#else // use builtin
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static unsigned short lengthc[] = { 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, 259 };
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static unsigned char lengtheb[]= { 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 };
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static unsigned short distc[] = { 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, 32768 };
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@@ -829,6 +909,7 @@ unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_l
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// make returned pointer freeable
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STBIW_MEMMOVE(stbiw__sbraw(out), out, *out_len);
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return (unsigned char *) stbiw__sbraw(out);
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+#endif // STBIW_ZLIB_COMPRESS
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}
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static unsigned int stbiw__crc32(unsigned char *buffer, int len)
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@@ -895,61 +976,87 @@ static unsigned char stbiw__paeth(int a, int b, int c)
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}
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// @OPTIMIZE: provide an option that always forces left-predict or paeth predict
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+static void stbiw__encode_png_line(unsigned char *pixels, int stride_bytes, int width, int height, int y, int n, int filter_type, signed char *line_buffer)
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+{
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+ static int mapping[] = { 0,1,2,3,4 };
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+ static int firstmap[] = { 0,1,0,5,6 };
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+ int *mymap = (y != 0) ? mapping : firstmap;
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+ int i;
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+ int type = mymap[filter_type];
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+ unsigned char *z = pixels + stride_bytes * (stbi__flip_vertically_on_write ? height-1-y : y);
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+ for (i = 0; i < n; ++i) {
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+ switch (type) {
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+ case 0: line_buffer[i] = z[i]; break;
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+ case 1: line_buffer[i] = z[i]; break;
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+ case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break;
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+ case 3: line_buffer[i] = z[i] - (z[i-stride_bytes]>>1); break;
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+ case 4: line_buffer[i] = (signed char) (z[i] - stbiw__paeth(0,z[i-stride_bytes],0)); break;
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+ case 5: line_buffer[i] = z[i]; break;
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+ case 6: line_buffer[i] = z[i]; break;
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+ }
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+ }
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+ for (i=n; i < width*n; ++i) {
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+ switch (type) {
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+ case 0: line_buffer[i] = z[i]; break;
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+ case 1: line_buffer[i] = z[i] - z[i-n]; break;
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+ case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break;
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+ case 3: line_buffer[i] = z[i] - ((z[i-n] + z[i-stride_bytes])>>1); break;
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+ case 4: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], z[i-stride_bytes], z[i-stride_bytes-n]); break;
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+ case 5: line_buffer[i] = z[i] - (z[i-n]>>1); break;
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+ case 6: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], 0,0); break;
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+ }
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+ }
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+}
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+
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unsigned char *stbi_write_png_to_mem(unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len)
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{
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+ int force_filter = stbi_write_force_png_filter;
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int ctype[5] = { -1, 0, 4, 2, 6 };
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unsigned char sig[8] = { 137,80,78,71,13,10,26,10 };
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unsigned char *out,*o, *filt, *zlib;
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signed char *line_buffer;
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- int i,j,k,p,zlen;
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+ int j,zlen;
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if (stride_bytes == 0)
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stride_bytes = x * n;
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+ if (force_filter >= 5) {
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+ force_filter = -1;
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+ }
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+
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filt = (unsigned char *) STBIW_MALLOC((x*n+1) * y); if (!filt) return 0;
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line_buffer = (signed char *) STBIW_MALLOC(x * n); if (!line_buffer) { STBIW_FREE(filt); return 0; }
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for (j=0; j < y; ++j) {
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- static int mapping[] = { 0,1,2,3,4 };
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- static int firstmap[] = { 0,1,0,5,6 };
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- int *mymap = (j != 0) ? mapping : firstmap;
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- int best = 0, bestval = 0x7fffffff;
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- for (p=0; p < 2; ++p) {
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- for (k= p?best:0; k < 5; ++k) { // @TODO: clarity: rewrite this to go 0..5, and 'continue' the unwanted ones during 2nd pass
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- int type = mymap[k],est=0;
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- unsigned char *z = pixels + stride_bytes*j;
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- for (i=0; i < n; ++i)
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- switch (type) {
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- case 0: line_buffer[i] = z[i]; break;
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- case 1: line_buffer[i] = z[i]; break;
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- case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break;
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- case 3: line_buffer[i] = z[i] - (z[i-stride_bytes]>>1); break;
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- case 4: line_buffer[i] = (signed char) (z[i] - stbiw__paeth(0,z[i-stride_bytes],0)); break;
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- case 5: line_buffer[i] = z[i]; break;
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- case 6: line_buffer[i] = z[i]; break;
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- }
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- for (i=n; i < x*n; ++i) {
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- switch (type) {
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- case 0: line_buffer[i] = z[i]; break;
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- case 1: line_buffer[i] = z[i] - z[i-n]; break;
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- case 2: line_buffer[i] = z[i] - z[i-stride_bytes]; break;
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- case 3: line_buffer[i] = z[i] - ((z[i-n] + z[i-stride_bytes])>>1); break;
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- case 4: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], z[i-stride_bytes], z[i-stride_bytes-n]); break;
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- case 5: line_buffer[i] = z[i] - (z[i-n]>>1); break;
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- case 6: line_buffer[i] = z[i] - stbiw__paeth(z[i-n], 0,0); break;
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- }
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- }
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- if (p) break;
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- for (i=0; i < x*n; ++i)
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+ int filter_type;
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+ if (force_filter > -1) {
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+ filter_type = force_filter;
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+ stbiw__encode_png_line(pixels, stride_bytes, x, y, j, n, force_filter, line_buffer);
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+ } else { // Estimate the best filter by running through all of them:
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+ int best_filter = 0, best_filter_val = 0x7fffffff, est, i;
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+ for (filter_type = 0; filter_type < 5; filter_type++) {
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+ stbiw__encode_png_line(pixels, stride_bytes, x, y, j, n, filter_type, line_buffer);
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+
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+ // Estimate the entropy of the line using this filter; the less, the better.
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+ est = 0;
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+ for (i = 0; i < x*n; ++i) {
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est += abs((signed char) line_buffer[i]);
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- if (est < bestval) { bestval = est; best = k; }
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+ }
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+ if (est < best_filter_val) {
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+ best_filter_val = est;
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+ best_filter = filter_type;
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+ }
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+ }
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+ if (filter_type != best_filter) { // If the last iteration already got us the best filter, don't redo it
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+ stbiw__encode_png_line(pixels, stride_bytes, x, y, j, n, best_filter, line_buffer);
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+ filter_type = best_filter;
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}
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}
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- // when we get here, best contains the filter type, and line_buffer contains the data
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- filt[j*(x*n+1)] = (unsigned char) best;
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+ // when we get here, filter_type contains the filter type, and line_buffer contains the data
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+ filt[j*(x*n+1)] = (unsigned char) filter_type;
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STBIW_MEMMOVE(filt+j*(x*n+1)+1, line_buffer, x*n);
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}
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STBIW_FREE(line_buffer);
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- zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, 8); // increase 8 to get smaller but use more memory
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+ zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, stbi_write_png_compression_level);
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STBIW_FREE(filt);
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if (!zlib) return 0;
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@@ -994,7 +1101,11 @@ STBIWDEF int stbi_write_png(char const *filename, int x, int y, int comp, const
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int len;
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unsigned char *png = stbi_write_png_to_mem((unsigned char *) data, stride_bytes, x, y, comp, &len);
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if (png == NULL) return 0;
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+#ifdef STBI_MSC_SECURE_CRT
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+ fopen_s(&f, filename, "wb");
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+#else
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f = fopen(filename, "wb");
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+#endif
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if (!f) { STBIW_FREE(png); return 0; }
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fwrite(png, 1, len, f);
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fclose(f);
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@@ -1013,9 +1124,361 @@ STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int x,
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return 1;
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}
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+
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+/* ***************************************************************************
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+ *
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+ * JPEG writer
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+ *
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+ * This is based on Jon Olick's jo_jpeg.cpp:
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+ * public domain Simple, Minimalistic JPEG writer - http://www.jonolick.com/code.html
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+ */
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+
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+static const unsigned char stbiw__jpg_ZigZag[] = { 0,1,5,6,14,15,27,28,2,4,7,13,16,26,29,42,3,8,12,17,25,30,41,43,9,11,18,
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+ 24,31,40,44,53,10,19,23,32,39,45,52,54,20,22,33,38,46,51,55,60,21,34,37,47,50,56,59,61,35,36,48,49,57,58,62,63 };
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+
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+static void stbiw__jpg_writeBits(stbi__write_context *s, int *bitBufP, int *bitCntP, const unsigned short *bs) {
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+ int bitBuf = *bitBufP, bitCnt = *bitCntP;
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+ bitCnt += bs[1];
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+ bitBuf |= bs[0] << (24 - bitCnt);
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+ while(bitCnt >= 8) {
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+ unsigned char c = (bitBuf >> 16) & 255;
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+ stbiw__putc(s, c);
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+ if(c == 255) {
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+ stbiw__putc(s, 0);
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+ }
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+ bitBuf <<= 8;
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+ bitCnt -= 8;
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+ }
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+ *bitBufP = bitBuf;
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+ *bitCntP = bitCnt;
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+}
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+
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+static void stbiw__jpg_DCT(float *d0p, float *d1p, float *d2p, float *d3p, float *d4p, float *d5p, float *d6p, float *d7p) {
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+ float d0 = *d0p, d1 = *d1p, d2 = *d2p, d3 = *d3p, d4 = *d4p, d5 = *d5p, d6 = *d6p, d7 = *d7p;
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+ float z1, z2, z3, z4, z5, z11, z13;
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+
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+ float tmp0 = d0 + d7;
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+ float tmp7 = d0 - d7;
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+ float tmp1 = d1 + d6;
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+ float tmp6 = d1 - d6;
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+ float tmp2 = d2 + d5;
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+ float tmp5 = d2 - d5;
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+ float tmp3 = d3 + d4;
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+ float tmp4 = d3 - d4;
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+
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+ // Even part
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+ float tmp10 = tmp0 + tmp3; // phase 2
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+ float tmp13 = tmp0 - tmp3;
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+ float tmp11 = tmp1 + tmp2;
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+ float tmp12 = tmp1 - tmp2;
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+
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+ d0 = tmp10 + tmp11; // phase 3
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+ d4 = tmp10 - tmp11;
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+
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+ z1 = (tmp12 + tmp13) * 0.707106781f; // c4
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+ d2 = tmp13 + z1; // phase 5
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+ d6 = tmp13 - z1;
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+
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+ // Odd part
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+ tmp10 = tmp4 + tmp5; // phase 2
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+ tmp11 = tmp5 + tmp6;
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+ tmp12 = tmp6 + tmp7;
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+
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+ // The rotator is modified from fig 4-8 to avoid extra negations.
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+ z5 = (tmp10 - tmp12) * 0.382683433f; // c6
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+ z2 = tmp10 * 0.541196100f + z5; // c2-c6
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+ z4 = tmp12 * 1.306562965f + z5; // c2+c6
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+ z3 = tmp11 * 0.707106781f; // c4
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+
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+ z11 = tmp7 + z3; // phase 5
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+ z13 = tmp7 - z3;
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+
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+ *d5p = z13 + z2; // phase 6
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+ *d3p = z13 - z2;
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+ *d1p = z11 + z4;
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+ *d7p = z11 - z4;
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+
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+ *d0p = d0; *d2p = d2; *d4p = d4; *d6p = d6;
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+}
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+
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+static void stbiw__jpg_calcBits(int val, unsigned short bits[2]) {
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+ int tmp1 = val < 0 ? -val : val;
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+ val = val < 0 ? val-1 : val;
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+ bits[1] = 1;
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+ while(tmp1 >>= 1) {
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+ ++bits[1];
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+ }
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+ bits[0] = val & ((1<<bits[1])-1);
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+}
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+
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+static int stbiw__jpg_processDU(stbi__write_context *s, int *bitBuf, int *bitCnt, float *CDU, float *fdtbl, int DC, const unsigned short HTDC[256][2], const unsigned short HTAC[256][2]) {
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+ const unsigned short EOB[2] = { HTAC[0x00][0], HTAC[0x00][1] };
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+ const unsigned short M16zeroes[2] = { HTAC[0xF0][0], HTAC[0xF0][1] };
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+ int dataOff, i, diff, end0pos;
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+ int DU[64];
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+
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+ // DCT rows
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+ for(dataOff=0; dataOff<64; dataOff+=8) {
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+ stbiw__jpg_DCT(&CDU[dataOff], &CDU[dataOff+1], &CDU[dataOff+2], &CDU[dataOff+3], &CDU[dataOff+4], &CDU[dataOff+5], &CDU[dataOff+6], &CDU[dataOff+7]);
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+ }
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+ // DCT columns
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+ for(dataOff=0; dataOff<8; ++dataOff) {
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+ stbiw__jpg_DCT(&CDU[dataOff], &CDU[dataOff+8], &CDU[dataOff+16], &CDU[dataOff+24], &CDU[dataOff+32], &CDU[dataOff+40], &CDU[dataOff+48], &CDU[dataOff+56]);
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+ }
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+ // Quantize/descale/zigzag the coefficients
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+ for(i=0; i<64; ++i) {
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+ float v = CDU[i]*fdtbl[i];
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+ // DU[stbiw__jpg_ZigZag[i]] = (int)(v < 0 ? ceilf(v - 0.5f) : floorf(v + 0.5f));
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+ // ceilf() and floorf() are C99, not C89, but I /think/ they're not needed here anyway?
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+ DU[stbiw__jpg_ZigZag[i]] = (int)(v < 0 ? v - 0.5f : v + 0.5f);
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+ }
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+
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+ // Encode DC
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+ diff = DU[0] - DC;
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+ if (diff == 0) {
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+ stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTDC[0]);
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+ } else {
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+ unsigned short bits[2];
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+ stbiw__jpg_calcBits(diff, bits);
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+ stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTDC[bits[1]]);
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+ stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits);
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+ }
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+ // Encode ACs
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+ end0pos = 63;
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+ for(; (end0pos>0)&&(DU[end0pos]==0); --end0pos) {
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+ }
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+ // end0pos = first element in reverse order !=0
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+ if(end0pos == 0) {
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+ stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB);
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+ return DU[0];
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+ }
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+ for(i = 1; i <= end0pos; ++i) {
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+ int startpos = i;
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+ int nrzeroes;
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+ unsigned short bits[2];
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+ for (; DU[i]==0 && i<=end0pos; ++i) {
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+ }
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+ nrzeroes = i-startpos;
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+ if ( nrzeroes >= 16 ) {
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+ int lng = nrzeroes>>4;
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+ int nrmarker;
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+ for (nrmarker=1; nrmarker <= lng; ++nrmarker)
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+ stbiw__jpg_writeBits(s, bitBuf, bitCnt, M16zeroes);
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+ nrzeroes &= 15;
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+ }
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+ stbiw__jpg_calcBits(DU[i], bits);
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+ stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTAC[(nrzeroes<<4)+bits[1]]);
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+ stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits);
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+ }
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+ if(end0pos != 63) {
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+ stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB);
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+ }
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+ return DU[0];
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+}
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+
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+static int stbi_write_jpg_core(stbi__write_context *s, int width, int height, int comp, const void* data, int quality) {
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+ // Constants that don't pollute global namespace
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+ static const unsigned char std_dc_luminance_nrcodes[] = {0,0,1,5,1,1,1,1,1,1,0,0,0,0,0,0,0};
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+ static const unsigned char std_dc_luminance_values[] = {0,1,2,3,4,5,6,7,8,9,10,11};
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+ static const unsigned char std_ac_luminance_nrcodes[] = {0,0,2,1,3,3,2,4,3,5,5,4,4,0,0,1,0x7d};
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+ static const unsigned char std_ac_luminance_values[] = {
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+ 0x01,0x02,0x03,0x00,0x04,0x11,0x05,0x12,0x21,0x31,0x41,0x06,0x13,0x51,0x61,0x07,0x22,0x71,0x14,0x32,0x81,0x91,0xa1,0x08,
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|
|
+ 0x23,0x42,0xb1,0xc1,0x15,0x52,0xd1,0xf0,0x24,0x33,0x62,0x72,0x82,0x09,0x0a,0x16,0x17,0x18,0x19,0x1a,0x25,0x26,0x27,0x28,
|
|
|
+ 0x29,0x2a,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x53,0x54,0x55,0x56,0x57,0x58,0x59,
|
|
|
+ 0x5a,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x83,0x84,0x85,0x86,0x87,0x88,0x89,
|
|
|
+ 0x8a,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xb2,0xb3,0xb4,0xb5,0xb6,
|
|
|
+ 0xb7,0xb8,0xb9,0xba,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,0xe1,0xe2,
|
|
|
+ 0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa
|
|
|
+ };
|
|
|
+ static const unsigned char std_dc_chrominance_nrcodes[] = {0,0,3,1,1,1,1,1,1,1,1,1,0,0,0,0,0};
|
|
|
+ static const unsigned char std_dc_chrominance_values[] = {0,1,2,3,4,5,6,7,8,9,10,11};
|
|
|
+ static const unsigned char std_ac_chrominance_nrcodes[] = {0,0,2,1,2,4,4,3,4,7,5,4,4,0,1,2,0x77};
|
|
|
+ static const unsigned char std_ac_chrominance_values[] = {
|
|
|
+ 0x00,0x01,0x02,0x03,0x11,0x04,0x05,0x21,0x31,0x06,0x12,0x41,0x51,0x07,0x61,0x71,0x13,0x22,0x32,0x81,0x08,0x14,0x42,0x91,
|
|
|
+ 0xa1,0xb1,0xc1,0x09,0x23,0x33,0x52,0xf0,0x15,0x62,0x72,0xd1,0x0a,0x16,0x24,0x34,0xe1,0x25,0xf1,0x17,0x18,0x19,0x1a,0x26,
|
|
|
+ 0x27,0x28,0x29,0x2a,0x35,0x36,0x37,0x38,0x39,0x3a,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x53,0x54,0x55,0x56,0x57,0x58,
|
|
|
+ 0x59,0x5a,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x82,0x83,0x84,0x85,0x86,0x87,
|
|
|
+ 0x88,0x89,0x8a,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xb2,0xb3,0xb4,
|
|
|
+ 0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,
|
|
|
+ 0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa
|
|
|
+ };
|
|
|
+ // Huffman tables
|
|
|
+ static const unsigned short YDC_HT[256][2] = { {0,2},{2,3},{3,3},{4,3},{5,3},{6,3},{14,4},{30,5},{62,6},{126,7},{254,8},{510,9}};
|
|
|
+ static const unsigned short UVDC_HT[256][2] = { {0,2},{1,2},{2,2},{6,3},{14,4},{30,5},{62,6},{126,7},{254,8},{510,9},{1022,10},{2046,11}};
|
|
|
+ static const unsigned short YAC_HT[256][2] = {
|
|
|
+ {10,4},{0,2},{1,2},{4,3},{11,4},{26,5},{120,7},{248,8},{1014,10},{65410,16},{65411,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {12,4},{27,5},{121,7},{502,9},{2038,11},{65412,16},{65413,16},{65414,16},{65415,16},{65416,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {28,5},{249,8},{1015,10},{4084,12},{65417,16},{65418,16},{65419,16},{65420,16},{65421,16},{65422,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {58,6},{503,9},{4085,12},{65423,16},{65424,16},{65425,16},{65426,16},{65427,16},{65428,16},{65429,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {59,6},{1016,10},{65430,16},{65431,16},{65432,16},{65433,16},{65434,16},{65435,16},{65436,16},{65437,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {122,7},{2039,11},{65438,16},{65439,16},{65440,16},{65441,16},{65442,16},{65443,16},{65444,16},{65445,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {123,7},{4086,12},{65446,16},{65447,16},{65448,16},{65449,16},{65450,16},{65451,16},{65452,16},{65453,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {250,8},{4087,12},{65454,16},{65455,16},{65456,16},{65457,16},{65458,16},{65459,16},{65460,16},{65461,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {504,9},{32704,15},{65462,16},{65463,16},{65464,16},{65465,16},{65466,16},{65467,16},{65468,16},{65469,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {505,9},{65470,16},{65471,16},{65472,16},{65473,16},{65474,16},{65475,16},{65476,16},{65477,16},{65478,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {506,9},{65479,16},{65480,16},{65481,16},{65482,16},{65483,16},{65484,16},{65485,16},{65486,16},{65487,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {1017,10},{65488,16},{65489,16},{65490,16},{65491,16},{65492,16},{65493,16},{65494,16},{65495,16},{65496,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {1018,10},{65497,16},{65498,16},{65499,16},{65500,16},{65501,16},{65502,16},{65503,16},{65504,16},{65505,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {2040,11},{65506,16},{65507,16},{65508,16},{65509,16},{65510,16},{65511,16},{65512,16},{65513,16},{65514,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {65515,16},{65516,16},{65517,16},{65518,16},{65519,16},{65520,16},{65521,16},{65522,16},{65523,16},{65524,16},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {2041,11},{65525,16},{65526,16},{65527,16},{65528,16},{65529,16},{65530,16},{65531,16},{65532,16},{65533,16},{65534,16},{0,0},{0,0},{0,0},{0,0},{0,0}
|
|
|
+ };
|
|
|
+ static const unsigned short UVAC_HT[256][2] = {
|
|
|
+ {0,2},{1,2},{4,3},{10,4},{24,5},{25,5},{56,6},{120,7},{500,9},{1014,10},{4084,12},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {11,4},{57,6},{246,8},{501,9},{2038,11},{4085,12},{65416,16},{65417,16},{65418,16},{65419,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {26,5},{247,8},{1015,10},{4086,12},{32706,15},{65420,16},{65421,16},{65422,16},{65423,16},{65424,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {27,5},{248,8},{1016,10},{4087,12},{65425,16},{65426,16},{65427,16},{65428,16},{65429,16},{65430,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {58,6},{502,9},{65431,16},{65432,16},{65433,16},{65434,16},{65435,16},{65436,16},{65437,16},{65438,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {59,6},{1017,10},{65439,16},{65440,16},{65441,16},{65442,16},{65443,16},{65444,16},{65445,16},{65446,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {121,7},{2039,11},{65447,16},{65448,16},{65449,16},{65450,16},{65451,16},{65452,16},{65453,16},{65454,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {122,7},{2040,11},{65455,16},{65456,16},{65457,16},{65458,16},{65459,16},{65460,16},{65461,16},{65462,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {249,8},{65463,16},{65464,16},{65465,16},{65466,16},{65467,16},{65468,16},{65469,16},{65470,16},{65471,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {503,9},{65472,16},{65473,16},{65474,16},{65475,16},{65476,16},{65477,16},{65478,16},{65479,16},{65480,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {504,9},{65481,16},{65482,16},{65483,16},{65484,16},{65485,16},{65486,16},{65487,16},{65488,16},{65489,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {505,9},{65490,16},{65491,16},{65492,16},{65493,16},{65494,16},{65495,16},{65496,16},{65497,16},{65498,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {506,9},{65499,16},{65500,16},{65501,16},{65502,16},{65503,16},{65504,16},{65505,16},{65506,16},{65507,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {2041,11},{65508,16},{65509,16},{65510,16},{65511,16},{65512,16},{65513,16},{65514,16},{65515,16},{65516,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {16352,14},{65517,16},{65518,16},{65519,16},{65520,16},{65521,16},{65522,16},{65523,16},{65524,16},{65525,16},{0,0},{0,0},{0,0},{0,0},{0,0},
|
|
|
+ {1018,10},{32707,15},{65526,16},{65527,16},{65528,16},{65529,16},{65530,16},{65531,16},{65532,16},{65533,16},{65534,16},{0,0},{0,0},{0,0},{0,0},{0,0}
|
|
|
+ };
|
|
|
+ static const int YQT[] = {16,11,10,16,24,40,51,61,12,12,14,19,26,58,60,55,14,13,16,24,40,57,69,56,14,17,22,29,51,87,80,62,18,22,
|
|
|
+ 37,56,68,109,103,77,24,35,55,64,81,104,113,92,49,64,78,87,103,121,120,101,72,92,95,98,112,100,103,99};
|
|
|
+ static const int UVQT[] = {17,18,24,47,99,99,99,99,18,21,26,66,99,99,99,99,24,26,56,99,99,99,99,99,47,66,99,99,99,99,99,99,
|
|
|
+ 99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99};
|
|
|
+ static const float aasf[] = { 1.0f * 2.828427125f, 1.387039845f * 2.828427125f, 1.306562965f * 2.828427125f, 1.175875602f * 2.828427125f,
|
|
|
+ 1.0f * 2.828427125f, 0.785694958f * 2.828427125f, 0.541196100f * 2.828427125f, 0.275899379f * 2.828427125f };
|
|
|
+
|
|
|
+ int row, col, i, k;
|
|
|
+ float fdtbl_Y[64], fdtbl_UV[64];
|
|
|
+ unsigned char YTable[64], UVTable[64];
|
|
|
+
|
|
|
+ if(!data || !width || !height || comp > 4 || comp < 1) {
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ quality = quality ? quality : 90;
|
|
|
+ quality = quality < 1 ? 1 : quality > 100 ? 100 : quality;
|
|
|
+ quality = quality < 50 ? 5000 / quality : 200 - quality * 2;
|
|
|
+
|
|
|
+ for(i = 0; i < 64; ++i) {
|
|
|
+ int uvti, yti = (YQT[i]*quality+50)/100;
|
|
|
+ YTable[stbiw__jpg_ZigZag[i]] = (unsigned char) (yti < 1 ? 1 : yti > 255 ? 255 : yti);
|
|
|
+ uvti = (UVQT[i]*quality+50)/100;
|
|
|
+ UVTable[stbiw__jpg_ZigZag[i]] = (unsigned char) (uvti < 1 ? 1 : uvti > 255 ? 255 : uvti);
|
|
|
+ }
|
|
|
+
|
|
|
+ for(row = 0, k = 0; row < 8; ++row) {
|
|
|
+ for(col = 0; col < 8; ++col, ++k) {
|
|
|
+ fdtbl_Y[k] = 1 / (YTable [stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]);
|
|
|
+ fdtbl_UV[k] = 1 / (UVTable[stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // Write Headers
|
|
|
+ {
|
|
|
+ static const unsigned char head0[] = { 0xFF,0xD8,0xFF,0xE0,0,0x10,'J','F','I','F',0,1,1,0,0,1,0,1,0,0,0xFF,0xDB,0,0x84,0 };
|
|
|
+ static const unsigned char head2[] = { 0xFF,0xDA,0,0xC,3,1,0,2,0x11,3,0x11,0,0x3F,0 };
|
|
|
+ const unsigned char head1[] = { 0xFF,0xC0,0,0x11,8,(unsigned char)(height>>8),STBIW_UCHAR(height),(unsigned char)(width>>8),STBIW_UCHAR(width),
|
|
|
+ 3,1,0x11,0,2,0x11,1,3,0x11,1,0xFF,0xC4,0x01,0xA2,0 };
|
|
|
+ s->func(s->context, (void*)head0, sizeof(head0));
|
|
|
+ s->func(s->context, (void*)YTable, sizeof(YTable));
|
|
|
+ stbiw__putc(s, 1);
|
|
|
+ s->func(s->context, UVTable, sizeof(UVTable));
|
|
|
+ s->func(s->context, (void*)head1, sizeof(head1));
|
|
|
+ s->func(s->context, (void*)(std_dc_luminance_nrcodes+1), sizeof(std_dc_luminance_nrcodes)-1);
|
|
|
+ s->func(s->context, (void*)std_dc_luminance_values, sizeof(std_dc_luminance_values));
|
|
|
+ stbiw__putc(s, 0x10); // HTYACinfo
|
|
|
+ s->func(s->context, (void*)(std_ac_luminance_nrcodes+1), sizeof(std_ac_luminance_nrcodes)-1);
|
|
|
+ s->func(s->context, (void*)std_ac_luminance_values, sizeof(std_ac_luminance_values));
|
|
|
+ stbiw__putc(s, 1); // HTUDCinfo
|
|
|
+ s->func(s->context, (void*)(std_dc_chrominance_nrcodes+1), sizeof(std_dc_chrominance_nrcodes)-1);
|
|
|
+ s->func(s->context, (void*)std_dc_chrominance_values, sizeof(std_dc_chrominance_values));
|
|
|
+ stbiw__putc(s, 0x11); // HTUACinfo
|
|
|
+ s->func(s->context, (void*)(std_ac_chrominance_nrcodes+1), sizeof(std_ac_chrominance_nrcodes)-1);
|
|
|
+ s->func(s->context, (void*)std_ac_chrominance_values, sizeof(std_ac_chrominance_values));
|
|
|
+ s->func(s->context, (void*)head2, sizeof(head2));
|
|
|
+ }
|
|
|
+
|
|
|
+ // Encode 8x8 macroblocks
|
|
|
+ {
|
|
|
+ static const unsigned short fillBits[] = {0x7F, 7};
|
|
|
+ const unsigned char *imageData = (const unsigned char *)data;
|
|
|
+ int DCY=0, DCU=0, DCV=0;
|
|
|
+ int bitBuf=0, bitCnt=0;
|
|
|
+ // comp == 2 is grey+alpha (alpha is ignored)
|
|
|
+ int ofsG = comp > 2 ? 1 : 0, ofsB = comp > 2 ? 2 : 0;
|
|
|
+ int x, y, pos;
|
|
|
+ for(y = 0; y < height; y += 8) {
|
|
|
+ for(x = 0; x < width; x += 8) {
|
|
|
+ float YDU[64], UDU[64], VDU[64];
|
|
|
+ for(row = y, pos = 0; row < y+8; ++row) {
|
|
|
+ for(col = x; col < x+8; ++col, ++pos) {
|
|
|
+ int p = (stbi__flip_vertically_on_write ? height-1-row : row)*width*comp + col*comp;
|
|
|
+ float r, g, b;
|
|
|
+ if(row >= height) {
|
|
|
+ p -= width*comp*(row+1 - height);
|
|
|
+ }
|
|
|
+ if(col >= width) {
|
|
|
+ p -= comp*(col+1 - width);
|
|
|
+ }
|
|
|
+
|
|
|
+ r = imageData[p+0];
|
|
|
+ g = imageData[p+ofsG];
|
|
|
+ b = imageData[p+ofsB];
|
|
|
+ YDU[pos]=+0.29900f*r+0.58700f*g+0.11400f*b-128;
|
|
|
+ UDU[pos]=-0.16874f*r-0.33126f*g+0.50000f*b;
|
|
|
+ VDU[pos]=+0.50000f*r-0.41869f*g-0.08131f*b;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, YDU, fdtbl_Y, DCY, YDC_HT, YAC_HT);
|
|
|
+ DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, UDU, fdtbl_UV, DCU, UVDC_HT, UVAC_HT);
|
|
|
+ DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, VDU, fdtbl_UV, DCV, UVDC_HT, UVAC_HT);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // Do the bit alignment of the EOI marker
|
|
|
+ stbiw__jpg_writeBits(s, &bitBuf, &bitCnt, fillBits);
|
|
|
+ }
|
|
|
+
|
|
|
+ // EOI
|
|
|
+ stbiw__putc(s, 0xFF);
|
|
|
+ stbiw__putc(s, 0xD9);
|
|
|
+
|
|
|
+ return 1;
|
|
|
+}
|
|
|
+
|
|
|
+STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality)
|
|
|
+{
|
|
|
+ stbi__write_context s;
|
|
|
+ stbi__start_write_callbacks(&s, func, context);
|
|
|
+ return stbi_write_jpg_core(&s, x, y, comp, (void *) data, quality);
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+#ifndef STBI_WRITE_NO_STDIO
|
|
|
+STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const void *data, int quality)
|
|
|
+{
|
|
|
+ stbi__write_context s;
|
|
|
+ if (stbi__start_write_file(&s,filename)) {
|
|
|
+ int r = stbi_write_jpg_core(&s, x, y, comp, data, quality);
|
|
|
+ stbi__end_write_file(&s);
|
|
|
+ return r;
|
|
|
+ } else
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+#endif
|
|
|
+
|
|
|
#endif // STB_IMAGE_WRITE_IMPLEMENTATION
|
|
|
|
|
|
/* Revision history
|
|
|
+ 1.08 (2018-01-29)
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|
+ add stbi__flip_vertically_on_write, external zlib, zlib quality, choose PNG filter
|
|
|
+ 1.07 (2017-07-24)
|
|
|
+ doc fix
|
|
|
+ 1.06 (2017-07-23)
|
|
|
+ writing JPEG (using Jon Olick's code)
|
|
|
+ 1.05 ???
|
|
|
1.04 (2017-03-03)
|
|
|
monochrome BMP expansion
|
|
|
1.03 ???
|
Sean Barrett
