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1019 lines
35 KiB
1019 lines
35 KiB
/* stb_image_write - v1.16 - public domain - http://nothings.org/stb
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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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#define STB_IMAGE_WRITE_IMPLEMENTATION
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in the file that you want to have the implementation.
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Will probably not work correctly with strict-aliasing optimizations.
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ABOUT:
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This header file is a library for writing images to C stdio or a callback.
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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; 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_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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UNICODE:
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If compiling for Windows and you wish to use Unicode filenames, compile
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with
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#define STBIW_WINDOWS_UTF8
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and pass utf8-encoded filenames. Call stbiw_convert_wchar_to_utf8 to convert
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Windows wchar_t filenames to utf8.
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USAGE:
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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_jpg(char const *filename, int w, int h, int comp, const void *data, int quality);
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int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data);
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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 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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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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Each function returns 0 on failure and non-0 on success.
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The functions create an image file defined by the parameters. The image
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is a rectangle of pixels stored from left-to-right, top-to-bottom.
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Each pixel contains 'comp' channels of data stored interleaved with 8-bits
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per channel, in the following order: 1=Y, 2=YA, 3=RGB, 4=RGBA. (Y is
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monochrome color.) The rectangle is 'w' pixels wide and 'h' pixels tall.
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The *data pointer points to the first byte of the top-left-most pixel.
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For PNG, "stride_in_bytes" is the distance in bytes from the first byte of
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a row of pixels to the first byte of the next row of pixels.
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PNG creates output files with the same number of components as the input.
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The BMP format expands Y to RGB in the file format and does not
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output alpha.
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PNG supports writing rectangles of data even when the bytes storing rows of
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data are not consecutive in memory (e.g. sub-rectangles of a larger image),
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by supplying the stride between the beginning of adjacent rows. The other
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formats do not. (Thus you cannot write a native-format BMP through the BMP
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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_compression_level' (it defaults to 8).
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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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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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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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bugfixes:
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github:Chribba
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Guillaume Chereau
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github:jry2
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github:romigrou
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Sergio Gonzalez
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Jonas Karlsson
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Filip Wasil
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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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Cap Petschulat
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Simon Rodriguez
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Ivan Tikhonov
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github:ignotion
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Adam Schackart
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Andrew Kensler
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LICENSE
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See end of file for license information.
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*/
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#ifndef INCLUDE_STB_IMAGE_WRITE_H
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#define INCLUDE_STB_IMAGE_WRITE_H
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#include <stdlib.h>
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// if STB_IMAGE_WRITE_STATIC causes problems, try defining STBIWDEF to 'inline' or 'static inline'
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#ifndef STBIWDEF
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#ifdef STB_IMAGE_WRITE_STATIC
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#define STBIWDEF static
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#else
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#ifdef __cplusplus
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#define STBIWDEF extern "C"
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#else
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#define STBIWDEF extern
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#endif
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#endif
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#endif
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#ifndef STB_IMAGE_WRITE_STATIC // C++ forbids static forward declarations
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STBIWDEF int stbi_write_tga_with_rle;
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STBIWDEF int stbi_write_png_compression_level;
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STBIWDEF int stbi_write_force_png_filter;
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#endif
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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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#ifdef STBIW_WINDOWS_UTF8
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STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input);
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#endif
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#endif
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typedef void stbi_write_func(void *context, void *data, int size);
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STBIWDEF 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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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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STBIWDEF void stbi_flip_vertically_on_write(int flip_boolean);
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#endif//INCLUDE_STB_IMAGE_WRITE_H
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#ifdef STB_IMAGE_WRITE_IMPLEMENTATION
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#ifdef _WIN32
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#ifndef _CRT_SECURE_NO_WARNINGS
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#define _CRT_SECURE_NO_WARNINGS
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#endif
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#ifndef _CRT_NONSTDC_NO_DEPRECATE
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#define _CRT_NONSTDC_NO_DEPRECATE
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#endif
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#endif
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#ifndef STBI_WRITE_NO_STDIO
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#include <stdio.h>
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#endif // STBI_WRITE_NO_STDIO
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#if defined(STBIW_MALLOC) && defined(STBIW_FREE) && (defined(STBIW_REALLOC) || defined(STBIW_REALLOC_SIZED))
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// ok
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#elif !defined(STBIW_MALLOC) && !defined(STBIW_FREE) && !defined(STBIW_REALLOC) && !defined(STBIW_REALLOC_SIZED)
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// ok
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#else
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#error "Must define all or none of STBIW_MALLOC, STBIW_FREE, and STBIW_REALLOC (or STBIW_REALLOC_SIZED)."
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#endif
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#ifndef STBIW_MALLOC
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#define STBIW_MALLOC(sz) malloc(sz)
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#define STBIW_REALLOC(p,newsz) realloc(p,newsz)
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#define STBIW_FREE(p) free(p)
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#endif
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#ifndef STBIW_REALLOC_SIZED
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#define STBIW_REALLOC_SIZED(p,oldsz,newsz) STBIW_REALLOC(p,newsz)
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#endif
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#ifndef STBIW_MEMMOVE
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#define STBIW_MEMMOVE(a,b,sz) memmove(a,b,sz)
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#endif
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#ifndef STBIW_ASSERT
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#include <assert.h>
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#define STBIW_ASSERT(x) assert(x)
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#endif
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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 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_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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static int stbi__flip_vertically_on_write = 0;
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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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typedef struct
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{
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stbi_write_func *func;
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void *context;
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unsigned char buffer[64];
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int buf_used;
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} stbi__write_context;
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// initialize a callback-based context
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static void stbi__start_write_callbacks(stbi__write_context *s, stbi_write_func *c, void *context)
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{
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s->func = c;
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s->context = context;
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}
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#ifndef STBI_WRITE_NO_STDIO
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static void stbi__stdio_write(void *context, void *data, int size)
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{
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fwrite(data,1,size,(FILE*) context);
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}
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#if defined(_WIN32) && defined(STBIW_WINDOWS_UTF8)
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#ifdef __cplusplus
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#define STBIW_EXTERN extern "C"
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#else
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#define STBIW_EXTERN extern
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#endif
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STBIW_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags, const char *str, int cbmb, wchar_t *widestr, int cchwide);
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STBIW_EXTERN __declspec(dllimport) int __stdcall WideCharToMultiByte(unsigned int cp, unsigned long flags, const wchar_t *widestr, int cchwide, char *str, int cbmb, const char *defchar, int *used_default);
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STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input)
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{
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return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int) bufferlen, NULL, NULL);
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}
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#endif
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static FILE *stbiw__fopen(char const *filename, char const *mode)
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{
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FILE *f;
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#if defined(_WIN32) && defined(STBIW_WINDOWS_UTF8)
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wchar_t wMode[64];
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wchar_t wFilename[1024];
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if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename)/sizeof(*wFilename)))
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return 0;
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if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode)/sizeof(*wMode)))
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return 0;
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#if defined(_MSC_VER) && _MSC_VER >= 1400
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if (0 != _wfopen_s(&f, wFilename, wMode))
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f = 0;
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#else
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f = _wfopen(wFilename, wMode);
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#endif
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#elif defined(_MSC_VER) && _MSC_VER >= 1400
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if (0 != fopen_s(&f, filename, mode))
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f=0;
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#else
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f = fopen(filename, mode);
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#endif
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return f;
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}
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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 = stbiw__fopen(filename, "wb");
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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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static void stbi__end_write_file(stbi__write_context *s)
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{
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fclose((FILE *)s->context);
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}
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#endif // !STBI_WRITE_NO_STDIO
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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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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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switch (*fmt++) {
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case ' ': break;
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case '1': { unsigned char x = STBIW_UCHAR(va_arg(v, int));
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s->func(s->context,&x,1);
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break; }
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case '2': { int x = va_arg(v,int);
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unsigned char b[2];
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b[0] = STBIW_UCHAR(x);
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b[1] = STBIW_UCHAR(x>>8);
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s->func(s->context,b,2);
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break; }
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case '4': { stbiw_uint32 x = va_arg(v,int);
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unsigned char b[4];
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b[0]=STBIW_UCHAR(x);
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b[1]=STBIW_UCHAR(x>>8);
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b[2]=STBIW_UCHAR(x>>16);
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b[3]=STBIW_UCHAR(x>>24);
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s->func(s->context,b,4);
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break; }
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default:
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STBIW_ASSERT(0);
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return;
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}
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}
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}
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static void stbiw__writef(stbi__write_context *s, const char *fmt, ...)
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{
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va_list v;
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va_start(v, fmt);
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stbiw__writefv(s, fmt, v);
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va_end(v);
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}
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static void stbiw__write_flush(stbi__write_context *s)
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{
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if (s->buf_used) {
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s->func(s->context, &s->buffer, s->buf_used);
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s->buf_used = 0;
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}
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}
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static void stbiw__write1(stbi__write_context *s, unsigned char a)
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{
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if ((size_t)s->buf_used + 1 > sizeof(s->buffer))
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stbiw__write_flush(s);
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s->buffer[s->buf_used++] = a;
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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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int n;
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if ((size_t)s->buf_used + 3 > sizeof(s->buffer))
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stbiw__write_flush(s);
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n = s->buf_used;
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s->buf_used = n+3;
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s->buffer[n+0] = a;
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s->buffer[n+1] = b;
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s->buffer[n+2] = c;
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}
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static void stbiw__write_pixel(stbi__write_context *s, int rgb_dir, int comp, int write_alpha, int expand_mono, unsigned char *d)
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{
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unsigned char bg[3] = { 255, 0, 255}, px[3];
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int k;
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if (write_alpha < 0)
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stbiw__write1(s, d[comp - 1]);
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switch (comp) {
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case 2: // 2 pixels = mono + alpha, alpha is written separately, so same as 1-channel case
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case 1:
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if (expand_mono)
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stbiw__write3(s, d[0], d[0], d[0]); // monochrome bmp
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else
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stbiw__write1(s, d[0]); // monochrome TGA
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break;
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case 4:
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if (!write_alpha) {
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// composite against pink background
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for (k = 0; k < 3; ++k)
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px[k] = bg[k] + ((d[k] - bg[k]) * d[3]) / 255;
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stbiw__write3(s, px[1 - rgb_dir], px[1], px[1 + rgb_dir]);
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break;
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}
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/* FALLTHROUGH */
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case 3:
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stbiw__write3(s, d[1 - rgb_dir], d[1], d[1 + rgb_dir]);
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break;
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}
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if (write_alpha > 0)
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stbiw__write1(s, d[comp - 1]);
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}
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|
|
static void stbiw__write_pixels(stbi__write_context *s, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad, int expand_mono)
|
|
{
|
|
stbiw_uint32 zero = 0;
|
|
int i,j, j_end;
|
|
|
|
if (y <= 0)
|
|
return;
|
|
|
|
if (stbi__flip_vertically_on_write)
|
|
vdir *= -1;
|
|
|
|
if (vdir < 0) {
|
|
j_end = -1; j = y-1;
|
|
} else {
|
|
j_end = y; j = 0;
|
|
}
|
|
|
|
for (; j != j_end; j += vdir) {
|
|
for (i=0; i < x; ++i) {
|
|
unsigned char *d = (unsigned char *) data + (j*x+i)*comp;
|
|
stbiw__write_pixel(s, rgb_dir, comp, write_alpha, expand_mono, d);
|
|
}
|
|
stbiw__write_flush(s);
|
|
s->func(s->context, &zero, scanline_pad);
|
|
}
|
|
}
|
|
|
|
static int stbiw__outfile(stbi__write_context *s, int rgb_dir, int vdir, int x, int y, int comp, int expand_mono, void *data, int alpha, int pad, const char *fmt, ...)
|
|
{
|
|
if (y < 0 || x < 0) {
|
|
return 0;
|
|
} else {
|
|
va_list v;
|
|
va_start(v, fmt);
|
|
stbiw__writefv(s, fmt, v);
|
|
va_end(v);
|
|
stbiw__write_pixels(s,rgb_dir,vdir,x,y,comp,data,alpha,pad, expand_mono);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
static int stbi_write_bmp_core(stbi__write_context *s, int x, int y, int comp, const void *data)
|
|
{
|
|
if (comp != 4) {
|
|
// write RGB bitmap
|
|
int pad = (-x*3) & 3;
|
|
return stbiw__outfile(s,-1,-1,x,y,comp,1,(void *) data,0,pad,
|
|
"11 4 22 4" "4 44 22 444444",
|
|
'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40, // file header
|
|
40, x,y, 1,24, 0,0,0,0,0,0); // bitmap header
|
|
} else {
|
|
// RGBA bitmaps need a v4 header
|
|
// use BI_BITFIELDS mode with 32bpp and alpha mask
|
|
// (straight BI_RGB with alpha mask doesn't work in most readers)
|
|
return stbiw__outfile(s,-1,-1,x,y,comp,1,(void *)data,1,0,
|
|
"11 4 22 4" "4 44 22 444444 4444 4 444 444 444 444",
|
|
'B', 'M', 14+108+x*y*4, 0, 0, 14+108, // file header
|
|
108, x,y, 1,32, 3,0,0,0,0,0, 0xff0000,0xff00,0xff,0xff000000u, 0, 0,0,0, 0,0,0, 0,0,0, 0,0,0); // bitmap V4 header
|
|
}
|
|
}
|
|
|
|
STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data)
|
|
{
|
|
stbi__write_context s = { 0 };
|
|
stbi__start_write_callbacks(&s, func, context);
|
|
return stbi_write_bmp_core(&s, x, y, comp, data);
|
|
}
|
|
|
|
#ifndef STBI_WRITE_NO_STDIO
|
|
STBIWDEF int stbi_write_bmp(char const *filename, int x, int y, int comp, const void *data)
|
|
{
|
|
stbi__write_context s = { 0 };
|
|
if (stbi__start_write_file(&s,filename)) {
|
|
int r = stbi_write_bmp_core(&s, x, y, comp, data);
|
|
stbi__end_write_file(&s);
|
|
return r;
|
|
} else
|
|
return 0;
|
|
}
|
|
#endif //!STBI_WRITE_NO_STDIO
|
|
|
|
static int stbi_write_tga_core(stbi__write_context *s, int x, int y, int comp, void *data)
|
|
{
|
|
int has_alpha = (comp == 2 || comp == 4);
|
|
int colorbytes = has_alpha ? comp-1 : comp;
|
|
int format = colorbytes < 2 ? 3 : 2; // 3 color channels (RGB/RGBA) = 2, 1 color channel (Y/YA) = 3
|
|
|
|
if (y < 0 || x < 0)
|
|
return 0;
|
|
|
|
if (!stbi_write_tga_with_rle) {
|
|
return stbiw__outfile(s, -1, -1, x, y, comp, 0, (void *) data, has_alpha, 0,
|
|
"111 221 2222 11", 0, 0, format, 0, 0, 0, 0, 0, x, y, (colorbytes + has_alpha) * 8, has_alpha * 8);
|
|
} else {
|
|
int i,j,k;
|
|
int jend, jdir;
|
|
|
|
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);
|
|
|
|
if (stbi__flip_vertically_on_write) {
|
|
j = 0;
|
|
jend = y;
|
|
jdir = 1;
|
|
} else {
|
|
j = y-1;
|
|
jend = -1;
|
|
jdir = -1;
|
|
}
|
|
for (; j != jend; j += jdir) {
|
|
unsigned char *row = (unsigned char *) data + j * x * comp;
|
|
int len;
|
|
|
|
for (i = 0; i < x; i += len) {
|
|
unsigned char *begin = row + i * comp;
|
|
int diff = 1;
|
|
len = 1;
|
|
|
|
if (i < x - 1) {
|
|
++len;
|
|
diff = memcmp(begin, row + (i + 1) * comp, comp);
|
|
if (diff) {
|
|
const unsigned char *prev = begin;
|
|
for (k = i + 2; k < x && len < 128; ++k) {
|
|
if (memcmp(prev, row + k * comp, comp)) {
|
|
prev += comp;
|
|
++len;
|
|
} else {
|
|
--len;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
for (k = i + 2; k < x && len < 128; ++k) {
|
|
if (!memcmp(begin, row + k * comp, comp)) {
|
|
++len;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (diff) {
|
|
unsigned char header = STBIW_UCHAR(len - 1);
|
|
stbiw__write1(s, header);
|
|
for (k = 0; k < len; ++k) {
|
|
stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin + k * comp);
|
|
}
|
|
} else {
|
|
unsigned char header = STBIW_UCHAR(len - 129);
|
|
stbiw__write1(s, header);
|
|
stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin);
|
|
}
|
|
}
|
|
}
|
|
stbiw__write_flush(s);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data)
|
|
{
|
|
stbi__write_context s = { 0 };
|
|
stbi__start_write_callbacks(&s, func, context);
|
|
return stbi_write_tga_core(&s, x, y, comp, (void *) data);
|
|
}
|
|
|
|
#ifndef STBI_WRITE_NO_STDIO
|
|
STBIWDEF int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data)
|
|
{
|
|
stbi__write_context s = { 0 };
|
|
if (stbi__start_write_file(&s,filename)) {
|
|
int r = stbi_write_tga_core(&s, x, y, comp, (void *) data);
|
|
stbi__end_write_file(&s);
|
|
return r;
|
|
} else
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
// *************************************************************************************************
|
|
// Radiance RGBE HDR writer
|
|
// by Baldur Karlsson
|
|
|
|
#define stbiw__max(a, b) ((a) > (b) ? (a) : (b))
|
|
|
|
#ifndef STBI_WRITE_NO_STDIO
|
|
|
|
static void stbiw__linear_to_rgbe(unsigned char *rgbe, float *linear)
|
|
{
|
|
int exponent;
|
|
float maxcomp = stbiw__max(linear[0], stbiw__max(linear[1], linear[2]));
|
|
|
|
if (maxcomp < 1e-32f) {
|
|
rgbe[0] = rgbe[1] = rgbe[2] = rgbe[3] = 0;
|
|
} else {
|
|
float normalize = (float) frexp(maxcomp, &exponent) * 256.0f/maxcomp;
|
|
|
|
rgbe[0] = (unsigned char)(linear[0] * normalize);
|
|
rgbe[1] = (unsigned char)(linear[1] * normalize);
|
|
rgbe[2] = (unsigned char)(linear[2] * normalize);
|
|
rgbe[3] = (unsigned char)(exponent + 128);
|
|
}
|
|
}
|
|
|
|
static void stbiw__write_run_data(stbi__write_context *s, int length, unsigned char databyte)
|
|
{
|
|
unsigned char lengthbyte = STBIW_UCHAR(length+128);
|
|
STBIW_ASSERT(length+128 <= 255);
|
|
s->func(s->context, &lengthbyte, 1);
|
|
s->func(s->context, &databyte, 1);
|
|
}
|
|
|
|
static void stbiw__write_dump_data(stbi__write_context *s, int length, unsigned char *data)
|
|
{
|
|
unsigned char lengthbyte = STBIW_UCHAR(length);
|
|
STBIW_ASSERT(length <= 128); // inconsistent with spec but consistent with official code
|
|
s->func(s->context, &lengthbyte, 1);
|
|
s->func(s->context, data, length);
|
|
}
|
|
|
|
static void stbiw__write_hdr_scanline(stbi__write_context *s, int width, int ncomp, unsigned char *scratch, float *scanline)
|
|
{
|
|
unsigned char scanlineheader[4] = { 2, 2, 0, 0 };
|
|
unsigned char rgbe[4];
|
|
float linear[3];
|
|
int x;
|
|
|
|
scanlineheader[2] = (width&0xff00)>>8;
|
|
scanlineheader[3] = (width&0x00ff);
|
|
|
|
/* skip RLE for images too small or large */
|
|
if (width < 8 || width >= 32768) {
|
|
for (x=0; x < width; x++) {
|
|
switch (ncomp) {
|
|
case 4: /* fallthrough */
|
|
case 3: linear[2] = scanline[x*ncomp + 2];
|
|
linear[1] = scanline[x*ncomp + 1];
|
|
linear[0] = scanline[x*ncomp + 0];
|
|
break;
|
|
default:
|
|
linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0];
|
|
break;
|
|
}
|
|
stbiw__linear_to_rgbe(rgbe, linear);
|
|
s->func(s->context, rgbe, 4);
|
|
}
|
|
} else {
|
|
int c,r;
|
|
/* encode into scratch buffer */
|
|
for (x=0; x < width; x++) {
|
|
switch(ncomp) {
|
|
case 4: /* fallthrough */
|
|
case 3: linear[2] = scanline[x*ncomp + 2];
|
|
linear[1] = scanline[x*ncomp + 1];
|
|
linear[0] = scanline[x*ncomp + 0];
|
|
break;
|
|
default:
|
|
linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0];
|
|
break;
|
|
}
|
|
stbiw__linear_to_rgbe(rgbe, linear);
|
|
scratch[x + width*0] = rgbe[0];
|
|
scratch[x + width*1] = rgbe[1];
|
|
scratch[x + width*2] = rgbe[2];
|
|
scratch[x + width*3] = rgbe[3];
|
|
}
|
|
|
|
s->func(s->context, scanlineheader, 4);
|
|
|
|
/* RLE each component separately */
|
|
for (c=0; c < 4; c++) {
|
|
unsigned char *comp = &scratch[width*c];
|
|
|
|
x = 0;
|
|
while (x < width) {
|
|
// find first run
|
|
r = x;
|
|
while (r+2 < width) {
|
|
if (comp[r] == comp[r+1] && comp[r] == comp[r+2])
|
|
break;
|
|
++r;
|
|
}
|
|
if (r+2 >= width)
|
|
r = width;
|
|
// dump up to first run
|
|
while (x < r) {
|
|
int len = r-x;
|
|
if (len > 128) len = 128;
|
|
stbiw__write_dump_data(s, len, &comp[x]);
|
|
x += len;
|
|
}
|
|
// if there's a run, output it
|
|
if (r+2 < width) { // same test as what we break out of in search loop, so only true if we break'd
|
|
// find next byte after run
|
|
while (r < width && comp[r] == comp[x])
|
|
++r;
|
|
// output run up to r
|
|
while (x < r) {
|
|
int len = r-x;
|
|
if (len > 127) len = 127;
|
|
stbiw__write_run_data(s, len, comp[x]);
|
|
x += len;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int stbi_write_hdr_core(stbi__write_context *s, int x, int y, int comp, float *data)
|
|
{
|
|
if (y <= 0 || x <= 0 || data == NULL)
|
|
return 0;
|
|
else {
|
|
// Each component is stored separately. Allocate scratch space for full output scanline.
|
|
unsigned char *scratch = (unsigned char *) STBIW_MALLOC(x*4);
|
|
int i, len;
|
|
char buffer[128];
|
|
char header[] = "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n";
|
|
s->func(s->context, header, sizeof(header)-1);
|
|
|
|
#ifdef __STDC_LIB_EXT1__
|
|
len = sprintf_s(buffer, sizeof(buffer), "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x);
|
|
#else
|
|
len = 0; //
|
|
#endif
|
|
s->func(s->context, buffer, len);
|
|
|
|
for(i=0; i < y; i++)
|
|
stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp*x*(stbi__flip_vertically_on_write ? y-1-i : i));
|
|
STBIW_FREE(scratch);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const float *data)
|
|
{
|
|
stbi__write_context s = { 0 };
|
|
stbi__start_write_callbacks(&s, func, context);
|
|
return stbi_write_hdr_core(&s, x, y, comp, (float *) data);
|
|
}
|
|
|
|
STBIWDEF int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *data)
|
|
{
|
|
stbi__write_context s = { 0 };
|
|
if (stbi__start_write_file(&s,filename)) {
|
|
int r = stbi_write_hdr_core(&s, x, y, comp, (float *) data);
|
|
stbi__end_write_file(&s);
|
|
return r;
|
|
} else
|
|
return 0;
|
|
}
|
|
#endif // STBI_WRITE_NO_STDIO
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// PNG writer
|
|
//
|
|
|
|
#ifndef STBIW_ZLIB_COMPRESS
|
|
// stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size()
|
|
#define stbiw__sbraw(a) ((int *) (void *) (a) - 2)
|
|
#define stbiw__sbm(a) stbiw__sbraw(a)[0]
|
|
#define stbiw__sbn(a) stbiw__sbraw(a)[1]
|
|
|
|
#define stbiw__sbneedgrow(a,n) ((a)==0 || stbiw__sbn(a)+n >= stbiw__sbm(a))
|
|
#define stbiw__sbmaybegrow(a,n) (stbiw__sbneedgrow(a,(n)) ? stbiw__sbgrow(a,n) : 0)
|
|
#define stbiw__sbgrow(a,n) stbiw__sbgrowf((void **) &(a), (n), sizeof(*(a)))
|
|
|
|
#define stbiw__sbpush(a, v) (stbiw__sbmaybegrow(a,1), (a)[stbiw__sbn(a)++] = (v))
|
|
#define stbiw__sbcount(a) ((a) ? stbiw__sbn(a) : 0)
|
|
#define stbiw__sbfree(a) ((a) ? STBIW_FREE(stbiw__sbraw(a)),0 : 0)
|
|
|
|
static void *stbiw__sbgrowf(void **arr, int increment, int itemsize)
|
|
{
|
|
int m = *arr ? 2*stbiw__sbm(*arr)+increment : increment+1;
|
|
void *p = STBIW_REALLOC_SIZED(*arr ? stbiw__sbraw(*arr) : 0, *arr ? (stbiw__sbm(*arr)*itemsize + sizeof(int)*2) : 0, itemsize * m + sizeof(int)*2);
|
|
STBIW_ASSERT(p);
|
|
if (p) {
|
|
if (!*arr) ((int *) p)[1] = 0;
|
|
*arr = (void *) ((int *) p + 2);
|
|
stbiw__sbm(*arr) = m;
|
|
}
|
|
return *arr;
|
|
}
|
|
|
|
static unsigned char *stbiw__zlib_flushf(unsigned char *data, unsigned int *bitbuffer, int *bitcount)
|
|
{
|
|
while (*bitcount >= 8) {
|
|
stbiw__sbpush(data, STBIW_UCHAR(*bitbuffer));
|
|
*bitbuffer >>= 8;
|
|
*bitcount -= 8;
|
|
}
|
|
return data;
|
|
}
|
|
|
|
static int stbiw__zlib_bitrev(int code, int codebits)
|
|
{
|
|
int res=0;
|
|
while (codebits--) {
|
|
res = (res << 1) | (code & 1);
|
|
code >>= 1;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static unsigned int stbiw__zlib_countm(unsigned char *a, unsigned char *b, int limit)
|
|
{
|
|
int i;
|
|
for (i=0; i < limit && i < 258; ++i)
|
|
if (a[i] != b[i]) break;
|
|
return i;
|
|
}
|
|
|
|
static unsigned int stbiw__zhash(unsigned char *data)
|
|
{
|
|
stbiw_uint32 hash = data[0] + (data[1] << 8) + (data[2] << 16);
|
|
hash ^= hash << 3;
|
|
hash += hash >> 5;
|
|
hash ^= hash << 4;
|
|
hash += hash >> 17;
|
|
hash ^= hash << 25;
|
|
hash += hash >> 6;
|
|
return hash;
|
|
}
|
|
|
|
#define stbiw__zlib_flush() (out = stbiw__zlib_flushf(out, &bitbuf, &bitcount))
|
|
#define stbiw__zlib_add(code,codebits) \
|
|
(bitbuf |= (code) << bitcount, bitcount += (codebits), stbiw__zlib_flush())
|
|
#define stbiw__zlib_huffa(b,c) stbiw__zlib_add(stbiw__zlib_bitrev(b,c),c)
|
|
// default huffman tables
|
|
#define stbiw__zlib_huff1(n) stbiw__zlib_huffa(0x30 + (n), 8)
|
|
#define stbiw__zlib_huff2(n) stbiw__zlib_huffa(0x190 + (n)-144, 9)
|
|
#define stbiw__zlib_huff3(n) stbiw__zlib_huffa(0 + (n)-256,7)
|
|
#define stbiw__zlib_huff4(n) stbiw__zlib_huffa(0xc0 + (n)-280,8)
|
|
#define stbiw__zlib_huff(n) ((n) <= 143 ? stbiw__zlib_huff1(n) : (n) <= 255 ? stbiw__zlib_huff2(n) : (n) <= 279 ? stbiw__zlib_huff3(n) : stbiw__zlib_huff4(n))
|
|
#define stbiw__zlib_huffb(n) ((n) <= 143 ? stbiw__zlib_huff1(n) : stbiw__zlib_huff2(n))
|
|
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#define stbiw__ZHASH 16384
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#endif // STBIW_ZLIB_COMPRESS
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STBIWDEF 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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static unsigned char disteb[] = { 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 };
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unsigned int bitbuf=0;
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int i,j, bitcount=0;
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unsigned char *out = NULL;
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unsigned char ***hash_table = (unsigned char***) STBIW_MALLOC(stbiw__ZHASH * sizeof(unsigned char**));
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if (hash_table == NULL)
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return NULL;
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if (quality < 5) quality = 5;
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stbiw__sbpush(out, 0x78); // DEFLATE 32K window
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stbiw__sbpush(out, 0x5e); // FLEVEL = 1
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stbiw__zlib_add(1,1); // BFINAL = 1
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stbiw__zlib_add(1,2); // BTYPE = 1 -- fixed huffman
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for (i=0; i < stbiw__ZHASH; ++i)
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hash_table[i] = NULL;
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i=0;
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while (i < data_len-3) {
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// hash next 3 bytes of data to be compressed
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int h = stbiw__zhash(data+i)&(stbiw__ZHASH-1), best=3;
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unsigned char *bestloc = 0;
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unsigned char **hlist = hash_table[h];
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int n = stbiw__sbcount(hlist);
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for (j=0; j < n; ++j) {
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if (hlist[j]-data > i-32768) { // if entry lies within window
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int d = stbiw__zlib_countm(hlist[j], data+i, data_len-i);
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if (d >= best) { best=d; bestloc=hlist[j]; }
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}
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}
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// when hash table entry is too long, delete half the entries
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if (hash_table[h] && stbiw__sbn(hash_table[h]) == 2*quality) {
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STBIW_MEMMOVE(hash_table[h], hash_table[h]+quality, sizeof(hash_table[h][0])*quality);
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stbiw__sbn(hash_table[h]) = quality;
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}
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stbiw__sbpush(hash_table[h],data+i);
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if (bestloc) {
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// "lazy matching" - check match at *next* byte, and if it's better, do cur byte as literal
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h = stbiw__zhash(data+i+1)&(stbiw__ZHASH-1);
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hlist = hash_table[h];
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n = stbiw__sbcount(hlist);
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for (j=0; j < n; ++j) {
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if (hlist[j]-data > i-32767) {
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int e = stbiw__zlib_countm(hlist[j], data+i+1, data_len-i-1);
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if (e > best) { // if next match is better, bail on current match
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bestloc = NULL;
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break;
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}
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}
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}
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}
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if (bestloc) {
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int d = (int) (data+i - bestloc); // distance back
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STBIW_ASSERT(d <= 32767 && best <= 258);
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for (j=0; best > lengthc[j+1]-1; ++j);
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stbiw__zlib_huff(j+257);
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if (lengtheb[j]) stbiw__zlib_add(best - lengthc[j], lengtheb[j]);
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for (j=0; d > distc[j+1]-1; ++j);
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stbiw__zlib_add(stbiw__zlib_bitrev(j,5),5);
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if (disteb[j]) stbiw__zlib_add(d - distc[j], disteb[j]);
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i += best;
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} else {
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stbiw__zlib_huffb(data[i]);
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++i;
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}
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}
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// write out final bytes
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for (;i < data_len; ++i)
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stbiw__zlib_huffb(data[i]);
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stbiw__zlib_huff(256); // end of block
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// pad with 0 bits to byte boundary
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while (bitcount)
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stbiw__zlib_add(0,1);
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for (i=0; i < stbiw__ZHASH; ++i)
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(void) stbiw__sbfree(hash_table[i]);
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STBIW_FREE(hash_table);
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// store uncompressed instead if compression was worse
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if (stbiw__sbn(out) > data_len + 2 + ((data_len+32766)/32767)*5) {
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stbiw__sbn(out) = 2; // truncate to DEFLATE 32K window and FLEVEL = 1
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for (j = 0; j < data_len;) {
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int blocklen = data_len - j;
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if (blocklen > 32767) blocklen = 32767;
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stbiw__sbpush(out, data_len - j == blocklen); // BFINAL = ?, BTYPE = 0 -- no compression
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stbiw__sbpush(out, STBIW_UCHAR(blocklen)); // LEN
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stbiw__sbpush(out, STBIW_UCHAR(blocklen >> 8));
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stbiw__sbpush(out, STBIW_UCHAR(~blocklen)); // NLEN
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stbiw__sbpush(out, STBIW_UCHAR(~blocklen >> 8));
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memcpy(out+stbiw__sbn(out), data+j, blocklen);
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stbiw__sbn(out) += blocklen;
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j += blocklen;
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}
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}
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{
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// compute adler32 on input
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unsigned int s1=1, s2=0;
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int blocklen = (int) (data_len % 5552);
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j=0;
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while (j < data_len) {
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for (i=0; i < blocklen; ++i) { s1 += data[j+i]; s2 += s1; }
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s1 %= 65521; s2 %= 65521;
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j += blocklen;
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blocklen = 5552;
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}
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stbiw__sbpush(out, STBIW_UCHAR(s2 >> 8));
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stbiw__sbpush(out, STBIW_UCHAR(s2));
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stbiw__sbpush(out, STBIW_UCHAR(s1 >> 8));
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stbiw__sbpush(out, STBIW_UCHAR(s1));
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}
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*out_len = stbiw__sbn(out);
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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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#endif // STB_IMAGE_WRITE_IMPLEMENTATION
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