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authorAndrew Opalach <andrew@akon.city> 2020-10-01 05:24:29 -0400
committerAndrew Opalach <andrew@akon.city> 2020-10-01 05:24:29 -0400
commit5e981cd004ac092f35588ebdc4e58e03131296b3 (patch)
tree8dcb262db78fdc5a3a7cde627a7f73f2f34f7c79 /subprojects/stb_image
parent4c200513158ad0b974cda961deffe6192830ecae (diff)
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cleanup 'todo' usage
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-/* stb_image_write - v1.15 - public domain - http://nothings.org/stb
- writes out PNG/BMP/TGA/JPEG/HDR images to C stdio - Sean Barrett 2010-2015
- no warranty implied; use at your own risk
-
- Before #including,
-
- #define STB_IMAGE_WRITE_IMPLEMENTATION
-
- in the file that you want to have the implementation.
-
- Will probably not work correctly with strict-aliasing optimizations.
-
-ABOUT:
-
- This header file is a library for writing images to C stdio or a callback.
-
- The PNG output is not optimal; it is 20-50% larger than the file
- written by a decent optimizing implementation; though providing a custom
- zlib compress function (see STBIW_ZLIB_COMPRESS) can mitigate that.
- This library is designed for source code compactness and simplicity,
- not optimal image file size or run-time performance.
-
-BUILDING:
-
- You can #define STBIW_ASSERT(x) before the #include to avoid using assert.h.
- You can #define STBIW_MALLOC(), STBIW_REALLOC(), and STBIW_FREE() to replace
- malloc,realloc,free.
- You can #define STBIW_MEMMOVE() to replace memmove()
- You can #define STBIW_ZLIB_COMPRESS to use a custom zlib-style compress function
- for PNG compression (instead of the builtin one), it must have the following signature:
- unsigned char * my_compress(unsigned char *data, int data_len, int *out_len, int quality);
- The returned data will be freed with STBIW_FREE() (free() by default),
- so it must be heap allocated with STBIW_MALLOC() (malloc() by default),
-
-UNICODE:
-
- If compiling for Windows and you wish to use Unicode filenames, compile
- with
- #define STBIW_WINDOWS_UTF8
- and pass utf8-encoded filenames. Call stbiw_convert_wchar_to_utf8 to convert
- Windows wchar_t filenames to utf8.
-
-USAGE:
-
- There are five functions, one for each image file format:
-
- int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes);
- int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data);
- int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data);
- int stbi_write_jpg(char const *filename, int w, int h, int comp, const void *data, int quality);
- int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data);
-
- void stbi_flip_vertically_on_write(int flag); // flag is non-zero to flip data vertically
-
- There are also five equivalent functions that use an arbitrary write function. You are
- expected to open/close your file-equivalent before and after calling these:
-
- 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); int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void
-*data); int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); int
-stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data); int
-stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality);
-
- where the callback is:
- void stbi_write_func(void *context, void *data, int size);
-
- You can configure it with these global variables:
- int stbi_write_tga_with_rle; // defaults to true; set to 0 to disable RLE
- int stbi_write_png_compression_level; // defaults to 8; set to higher for more compression
- int stbi_write_force_png_filter; // defaults to -1; set to 0..5 to force a filter mode
-
-
- You can define STBI_WRITE_NO_STDIO to disable the file variant of these
- functions, so the library will not use stdio.h at all. However, this will
- also disable HDR writing, because it requires stdio for formatted output.
-
- Each function returns 0 on failure and non-0 on success.
-
- The functions create an image file defined by the parameters. The image
- is a rectangle of pixels stored from left-to-right, top-to-bottom.
- Each pixel contains 'comp' channels of data stored interleaved with 8-bits
- per channel, in the following order: 1=Y, 2=YA, 3=RGB, 4=RGBA. (Y is
- monochrome color.) The rectangle is 'w' pixels wide and 'h' pixels tall.
- The *data pointer points to the first byte of the top-left-most pixel.
- For PNG, "stride_in_bytes" is the distance in bytes from the first byte of
- a row of pixels to the first byte of the next row of pixels.
-
- PNG creates output files with the same number of components as the input.
- The BMP format expands Y to RGB in the file format and does not
- output alpha.
-
- PNG supports writing rectangles of data even when the bytes storing rows of
- data are not consecutive in memory (e.g. sub-rectangles of a larger image),
- by supplying the stride between the beginning of adjacent rows. The other
- formats do not. (Thus you cannot write a native-format BMP through the BMP
- writer, both because it is in BGR order and because it may have padding
- at the end of the line.)
-
- PNG allows you to set the deflate compression level by setting the global
- variable 'stbi_write_png_compression_level' (it defaults to 8).
-
- HDR expects linear float data. Since the format is always 32-bit rgb(e)
- data, alpha (if provided) is discarded, and for monochrome data it is
- replicated across all three channels.
-
- TGA supports RLE or non-RLE compressed data. To use non-RLE-compressed
- data, set the global variable 'stbi_write_tga_with_rle' to 0.
-
- JPEG does ignore alpha channels in input data; quality is between 1 and 100.
- Higher quality looks better but results in a bigger image.
- JPEG baseline (no JPEG progressive).
-
-CREDITS:
-
-
- Sean Barrett - PNG/BMP/TGA
- Baldur Karlsson - HDR
- Jean-Sebastien Guay - TGA monochrome
- Tim Kelsey - misc enhancements
- Alan Hickman - TGA RLE
- Emmanuel Julien - initial file IO callback implementation
- Jon Olick - original jo_jpeg.cpp code
- Daniel Gibson - integrate JPEG, allow external zlib
- Aarni Koskela - allow choosing PNG filter
-
- bugfixes:
- github:Chribba
- Guillaume Chereau
- github:jry2
- github:romigrou
- Sergio Gonzalez
- Jonas Karlsson
- Filip Wasil
- Thatcher Ulrich
- github:poppolopoppo
- Patrick Boettcher
- github:xeekworx
- Cap Petschulat
- Simon Rodriguez
- Ivan Tikhonov
- github:ignotion
- Adam Schackart
-
-LICENSE
-
- See end of file for license information.
-
-*/
-
-#ifndef INCLUDE_STB_IMAGE_WRITE_H
-#define INCLUDE_STB_IMAGE_WRITE_H
-
-#include <stdlib.h>
-
-// if STB_IMAGE_WRITE_STATIC causes problems, try defining STBIWDEF to 'inline' or 'static inline'
-#ifndef STBIWDEF
-#ifdef STB_IMAGE_WRITE_STATIC
-#define STBIWDEF static
-#else
-#ifdef __cplusplus
-#define STBIWDEF extern "C"
-#else
-#define STBIWDEF extern
-#endif
-#endif
-#endif
-
-#ifndef STB_IMAGE_WRITE_STATIC // C++ forbids static forward declarations
-extern int stbi_write_tga_with_rle;
-extern int stbi_write_png_compression_level;
-extern int stbi_write_force_png_filter;
-#endif
-
-#ifndef STBI_WRITE_NO_STDIO
-STBIWDEF int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes);
-STBIWDEF int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data);
-STBIWDEF int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data);
-STBIWDEF int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data);
-STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const void *data, int quality);
-
-#ifdef STBI_WINDOWS_UTF8
-STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t *input);
-#endif
-#endif
-
-typedef void stbi_write_func(void *context, void *data, int size);
-
-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);
-STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data);
-STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data);
-STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data);
-STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data,
- int quality);
-
-STBIWDEF void stbi_flip_vertically_on_write(int flip_boolean);
-
-#endif // INCLUDE_STB_IMAGE_WRITE_H
-
-#ifdef STB_IMAGE_WRITE_IMPLEMENTATION
-
-#ifdef _WIN32
-#ifndef _CRT_SECURE_NO_WARNINGS
-#define _CRT_SECURE_NO_WARNINGS
-#endif
-#ifndef _CRT_NONSTDC_NO_DEPRECATE
-#define _CRT_NONSTDC_NO_DEPRECATE
-#endif
-#endif
-
-#ifndef STBI_WRITE_NO_STDIO
-#include <stdio.h>
-#endif // STBI_WRITE_NO_STDIO
-
-#include <math.h>
-#include <stdarg.h>
-#include <stdlib.h>
-#include <string.h>
-
-#if defined(STBIW_MALLOC) && defined(STBIW_FREE) && (defined(STBIW_REALLOC) || defined(STBIW_REALLOC_SIZED))
-// ok
-#elif !defined(STBIW_MALLOC) && !defined(STBIW_FREE) && !defined(STBIW_REALLOC) && !defined(STBIW_REALLOC_SIZED)
-// ok
-#else
-#error "Must define all or none of STBIW_MALLOC, STBIW_FREE, and STBIW_REALLOC (or STBIW_REALLOC_SIZED)."
-#endif
-
-#ifndef STBIW_MALLOC
-#define STBIW_MALLOC(sz) malloc(sz)
-#define STBIW_REALLOC(p, newsz) realloc(p, newsz)
-#define STBIW_FREE(p) free(p)
-#endif
-
-#ifndef STBIW_REALLOC_SIZED
-#define STBIW_REALLOC_SIZED(p, oldsz, newsz) STBIW_REALLOC(p, newsz)
-#endif
-
-#ifndef STBIW_MEMMOVE
-#define STBIW_MEMMOVE(a, b, sz) memmove(a, b, sz)
-#endif
-
-#ifndef STBIW_ASSERT
-#include <assert.h>
-#define STBIW_ASSERT(x) assert(x)
-#endif
-
-#define STBIW_UCHAR(x) (unsigned char)((x)&0xff)
-
-#ifdef STB_IMAGE_WRITE_STATIC
-static int stbi_write_png_compression_level = 8;
-static int stbi_write_tga_with_rle = 1;
-static int stbi_write_force_png_filter = -1;
-#else
-int stbi_write_png_compression_level = 8;
-int stbi_write_tga_with_rle = 1;
-int stbi_write_force_png_filter = -1;
-#endif
-
-static int stbi__flip_vertically_on_write = 0;
-
-STBIWDEF void stbi_flip_vertically_on_write(int flag)
-{
- stbi__flip_vertically_on_write = flag;
-}
-
-typedef struct
-{
- stbi_write_func *func;
- void *context;
- unsigned char buffer[64];
- int buf_used;
-} stbi__write_context;
-
-// initialize a callback-based context
-static void stbi__start_write_callbacks(stbi__write_context *s, stbi_write_func *c, void *context)
-{
- s->func = c;
- s->context = context;
-}
-
-#ifndef STBI_WRITE_NO_STDIO
-
-static void stbi__stdio_write(void *context, void *data, int size)
-{
- fwrite(data, 1, size, (FILE *)context);
-}
-
-#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8)
-#ifdef __cplusplus
-#define STBIW_EXTERN extern "C"
-#else
-#define STBIW_EXTERN extern
-#endif
-STBIW_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags,
- const char *str, int cbmb, wchar_t *widestr,
- int cchwide);
-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);
-
-STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t *input)
-{
- return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int)bufferlen, NULL, NULL);
-}
-#endif
-
-static FILE *stbiw__fopen(char const *filename, char const *mode)
-{
- FILE *f;
-#if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8)
- wchar_t wMode[64];
- wchar_t wFilename[1024];
- if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename)))
- return 0;
-
- if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode)))
- return 0;
-
-#if _MSC_VER >= 1400
- if (0 != _wfopen_s(&f, wFilename, wMode))
- f = 0;
-#else
- f = _wfopen(wFilename, wMode);
-#endif
-
-#elif defined(_MSC_VER) && _MSC_VER >= 1400
- if (0 != fopen_s(&f, filename, mode))
- f = 0;
-#else
- f = fopen(filename, mode);
-#endif
- return f;
-}
-
-static int stbi__start_write_file(stbi__write_context *s, const char *filename)
-{
- FILE *f = stbiw__fopen(filename, "wb");
- stbi__start_write_callbacks(s, stbi__stdio_write, (void *)f);
- return f != NULL;
-}
-
-static void stbi__end_write_file(stbi__write_context *s)
-{
- fclose((FILE *)s->context);
-}
-
-#endif // !STBI_WRITE_NO_STDIO
-
-typedef unsigned int stbiw_uint32;
-typedef int stb_image_write_test[sizeof(stbiw_uint32) == 4 ? 1 : -1];
-
-static void stbiw__writefv(stbi__write_context *s, const char *fmt, va_list v)
-{
- while (*fmt)
- {
- switch (*fmt++)
- {
- case ' ':
- break;
- case '1': {
- unsigned char x = STBIW_UCHAR(va_arg(v, int));
- s->func(s->context, &x, 1);
- break;
- }
- case '2': {
- int x = va_arg(v, int);
- unsigned char b[2];
- b[0] = STBIW_UCHAR(x);
- b[1] = STBIW_UCHAR(x >> 8);
- s->func(s->context, b, 2);
- break;
- }
- case '4': {
- stbiw_uint32 x = va_arg(v, int);
- unsigned char b[4];
- b[0] = STBIW_UCHAR(x);
- b[1] = STBIW_UCHAR(x >> 8);
- b[2] = STBIW_UCHAR(x >> 16);
- b[3] = STBIW_UCHAR(x >> 24);
- s->func(s->context, b, 4);
- break;
- }
- default:
- STBIW_ASSERT(0);
- return;
- }
- }
-}
-
-static void stbiw__writef(stbi__write_context *s, const char *fmt, ...)
-{
- va_list v;
- va_start(v, fmt);
- stbiw__writefv(s, fmt, v);
- va_end(v);
-}
-
-static void stbiw__write_flush(stbi__write_context *s)
-{
- if (s->buf_used)
- {
- s->func(s->context, &s->buffer, s->buf_used);
- s->buf_used = 0;
- }
-}
-
-static void stbiw__putc(stbi__write_context *s, unsigned char c)
-{
- s->func(s->context, &c, 1);
-}
-
-static void stbiw__write1(stbi__write_context *s, unsigned char a)
-{
- if (s->buf_used + 1 > sizeof(s->buffer))
- stbiw__write_flush(s);
- s->buffer[s->buf_used++] = a;
-}
-
-static void stbiw__write3(stbi__write_context *s, unsigned char a, unsigned char b, unsigned char c)
-{
- int n;
- if (s->buf_used + 3 > sizeof(s->buffer))
- stbiw__write_flush(s);
- n = s->buf_used;
- s->buf_used = n + 3;
- s->buffer[n + 0] = a;
- s->buffer[n + 1] = b;
- s->buffer[n + 2] = c;
-}
-
-static void stbiw__write_pixel(stbi__write_context *s, int rgb_dir, int comp, int write_alpha, int expand_mono,
- unsigned char *d)
-{
- unsigned char bg[3] = {255, 0, 255}, px[3];
- int k;
-
- if (write_alpha < 0)
- stbiw__write1(s, d[comp - 1]);
-
- switch (comp)
- {
- case 2: // 2 pixels = mono + alpha, alpha is written separately, so same as 1-channel case
- case 1:
- if (expand_mono)
- stbiw__write3(s, d[0], d[0], d[0]); // monochrome bmp
- else
- stbiw__write1(s, d[0]); // monochrome TGA
- break;
- case 4:
- if (!write_alpha)
- {
- // composite against pink background
- for (k = 0; k < 3; ++k)
- px[k] = bg[k] + ((d[k] - bg[k]) * d[3]) / 255;
- stbiw__write3(s, px[1 - rgb_dir], px[1], px[1 + rgb_dir]);
- break;
- }
- /* FALLTHROUGH */
- case 3:
- stbiw__write3(s, d[1 - rgb_dir], d[1], d[1 + rgb_dir]);
- break;
- }
- if (write_alpha > 0)
- stbiw__write1(s, d[comp - 1]);
-}
-
-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)
-{
- 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
-}
-
-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))
-
-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_WANT_SECURE_LIB__
- len = sprintf_s(buffer, sizeof(buffer), "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x);
-#else
- len = sprintf(buffer, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x);
-#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);
-}
-
-#ifndef STBI_WRITE_NO_STDIO
-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))
-
-#define stbiw__ZHASH 16384
-
-#endif // STBIW_ZLIB_COMPRESS
-
-STBIWDEF unsigned char *stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality)
-{
-#ifdef STBIW_ZLIB_COMPRESS
- // user provided a zlib compress implementation, use that
- return STBIW_ZLIB_COMPRESS(data, data_len, out_len, quality);
-#else // use builtin
- 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};
- 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};
- 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};
- 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};
- unsigned int bitbuf = 0;
- int i, j, bitcount = 0;
- unsigned char *out = NULL;
- unsigned char ***hash_table = (unsigned char ***)STBIW_MALLOC(stbiw__ZHASH * sizeof(unsigned char **));
- if (hash_table == NULL)
- return NULL;
- if (quality < 5)
- quality = 5;
-
- stbiw__sbpush(out, 0x78); // DEFLATE 32K window
- stbiw__sbpush(out, 0x5e); // FLEVEL = 1
- stbiw__zlib_add(1, 1); // BFINAL = 1
- stbiw__zlib_add(1, 2); // BTYPE = 1 -- fixed huffman
-
- for (i = 0; i < stbiw__ZHASH; ++i)
- hash_table[i] = NULL;
-
- i = 0;
- while (i < data_len - 3)
- {
- // hash next 3 bytes of data to be compressed
- int h = stbiw__zhash(data + i) & (stbiw__ZHASH - 1), best = 3;
- unsigned char *bestloc = 0;
- unsigned char **hlist = hash_table[h];
- int n = stbiw__sbcount(hlist);
- for (j = 0; j < n; ++j)
- {
- if (hlist[j] - data > i - 32768)
- { // if entry lies within window
- int d = stbiw__zlib_countm(hlist[j], data + i, data_len - i);
- if (d >= best)
- {
- best = d;
- bestloc = hlist[j];
- }
- }
- }
- // when hash table entry is too long, delete half the entries
- if (hash_table[h] && stbiw__sbn(hash_table[h]) == 2 * quality)
- {
- STBIW_MEMMOVE(hash_table[h], hash_table[h] + quality, sizeof(hash_table[h][0]) * quality);
- stbiw__sbn(hash_table[h]) = quality;
- }
- stbiw__sbpush(hash_table[h], data + i);
-
- if (bestloc)
- {
- // "lazy matching" - check match at *next* byte, and if it's better, do cur byte as literal
- h = stbiw__zhash(data + i + 1) & (stbiw__ZHASH - 1);
- hlist = hash_table[h];
- n = stbiw__sbcount(hlist);
- for (j = 0; j < n; ++j)
- {
- if (hlist[j] - data > i - 32767)
- {
- int e = stbiw__zlib_countm(hlist[j], data + i + 1, data_len - i - 1);
- if (e > best)
- { // if next match is better, bail on current match
- bestloc = NULL;
- break;
- }
- }
- }
- }
-
- if (bestloc)
- {
- int d = (int)(data + i - bestloc); // distance back
- STBIW_ASSERT(d <= 32767 && best <= 258);
- for (j = 0; best > lengthc[j + 1] - 1; ++j)
- ;
- stbiw__zlib_huff(j + 257);
- if (lengtheb[j])
- stbiw__zlib_add(best - lengthc[j], lengtheb[j]);
- for (j = 0; d > distc[j + 1] - 1; ++j)
- ;
- stbiw__zlib_add(stbiw__zlib_bitrev(j, 5), 5);
- if (disteb[j])
- stbiw__zlib_add(d - distc[j], disteb[j]);
- i += best;
- }
- else
- {
- stbiw__zlib_huffb(data[i]);
- ++i;
- }
- }
- // write out final bytes
- for (; i < data_len; ++i)
- stbiw__zlib_huffb(data[i]);
- stbiw__zlib_huff(256); // end of block
- // pad with 0 bits to byte boundary
- while (bitcount)
- stbiw__zlib_add(0, 1);
-
- for (i = 0; i < stbiw__ZHASH; ++i)
- (void)stbiw__sbfree(hash_table[i]);
- STBIW_FREE(hash_table);
-
- {
- // compute adler32 on input
- unsigned int s1 = 1, s2 = 0;
- int blocklen = (int)(data_len % 5552);
- j = 0;
- while (j < data_len)
- {
- for (i = 0; i < blocklen; ++i)
- {
- s1 += data[j + i];
- s2 += s1;
- }
- s1 %= 65521;
- s2 %= 65521;
- j += blocklen;
- blocklen = 5552;
- }
- stbiw__sbpush(out, STBIW_UCHAR(s2 >> 8));
- stbiw__sbpush(out, STBIW_UCHAR(s2));
- stbiw__sbpush(out, STBIW_UCHAR(s1 >> 8));
- stbiw__sbpush(out, STBIW_UCHAR(s1));
- }
- *out_len = stbiw__sbn(out);
- // make returned pointer freeable
- STBIW_MEMMOVE(stbiw__sbraw(out), out, *out_len);
- return (unsigned char *)stbiw__sbraw(out);
-#endif // STBIW_ZLIB_COMPRESS
-}
-
-static unsigned int stbiw__crc32(unsigned char *buffer, int len)
-{
-#ifdef STBIW_CRC32
- return STBIW_CRC32(buffer, len);
-#else
- static unsigned int crc_table[256] = {
- 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, 0x0eDB8832,
- 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
- 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 0x136C9856, 0x646BA8C0, 0xFD62F97A,
- 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
- 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3,
- 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
- 0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB,
- 0xB6662D3D, 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
- 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, 0x6B6B51F4,
- 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
- 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, 0x4DB26158, 0x3AB551CE, 0xA3BC0074,
- 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
- 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525,
- 0x206F85B3, 0xB966D409, 0xCE61E49F, 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
- 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615,
- 0x73DC1683, 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
- 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, 0xFED41B76,
- 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
- 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6,
- 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
- 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7,
- 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
- 0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7,
- 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
- 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 0xA00AE278,
- 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
- 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, 0xBDBDF21C, 0xCABAC28A, 0x53B39330,
- 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
- 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D};
-
- unsigned int crc = ~0u;
- int i;
- for (i = 0; i < len; ++i)
- crc = (crc >> 8) ^ crc_table[buffer[i] ^ (crc & 0xff)];
- return ~crc;
-#endif
-}
-
-#define stbiw__wpng4(o, a, b, c, d) \
- ((o)[0] = STBIW_UCHAR(a), (o)[1] = STBIW_UCHAR(b), (o)[2] = STBIW_UCHAR(c), (o)[3] = STBIW_UCHAR(d), (o) += 4)
-#define stbiw__wp32(data, v) stbiw__wpng4(data, (v) >> 24, (v) >> 16, (v) >> 8, (v));
-#define stbiw__wptag(data, s) stbiw__wpng4(data, s[0], s[1], s[2], s[3])
-
-static void stbiw__wpcrc(unsigned char **data, int len)
-{
- unsigned int crc = stbiw__crc32(*data - len - 4, len + 4);
- stbiw__wp32(*data, crc);
-}
-
-static unsigned char stbiw__paeth(int a, int b, int c)
-{
- int p = a + b - c, pa = abs(p - a), pb = abs(p - b), pc = abs(p - c);
- if (pa <= pb && pa <= pc)
- return STBIW_UCHAR(a);
- if (pb <= pc)
- return STBIW_UCHAR(b);
- return STBIW_UCHAR(c);
-}
-
-// @OPTIMIZE: provide an option that always forces left-predict or paeth predict
-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)
-{
- static int mapping[] = {0, 1, 2, 3, 4};
- static int firstmap[] = {0, 1, 0, 5, 6};
- int *mymap = (y != 0) ? mapping : firstmap;
- int i;
- int type = mymap[filter_type];
- unsigned char *z = pixels + stride_bytes * (stbi__flip_vertically_on_write ? height - 1 - y : y);
- int signed_stride = stbi__flip_vertically_on_write ? -stride_bytes : stride_bytes;
-
- if (type == 0)
- {
- memcpy(line_buffer, z, width * n);
- return;
- }
-
- // first loop isn't optimized since it's just one pixel
- for (i = 0; i < n; ++i)
- {
- switch (type)
- {
- case 1:
- line_buffer[i] = z[i];
- break;
- case 2:
- line_buffer[i] = z[i] - z[i - signed_stride];
- break;
- case 3:
- line_buffer[i] = z[i] - (z[i - signed_stride] >> 1);
- break;
- case 4:
- line_buffer[i] = (signed char)(z[i] - stbiw__paeth(0, z[i - signed_stride], 0));
- break;
- case 5:
- line_buffer[i] = z[i];
- break;
- case 6:
- line_buffer[i] = z[i];
- break;
- }
- }
- switch (type)
- {
- case 1:
- for (i = n; i < width * n; ++i)
- line_buffer[i] = z[i] - z[i - n];
- break;
- case 2:
- for (i = n; i < width * n; ++i)
- line_buffer[i] = z[i] - z[i - signed_stride];
- break;
- case 3:
- for (i = n; i < width * n; ++i)
- line_buffer[i] = z[i] - ((z[i - n] + z[i - signed_stride]) >> 1);
- break;
- case 4:
- for (i = n; i < width * n; ++i)
- line_buffer[i] = z[i] - stbiw__paeth(z[i - n], z[i - signed_stride], z[i - signed_stride - n]);
- break;
- case 5:
- for (i = n; i < width * n; ++i)
- line_buffer[i] = z[i] - (z[i - n] >> 1);
- break;
- case 6:
- for (i = n; i < width * n; ++i)
- line_buffer[i] = z[i] - stbiw__paeth(z[i - n], 0, 0);
- break;
- }
-}
-
-STBIWDEF unsigned char *stbi_write_png_to_mem(const unsigned char *pixels, int stride_bytes, int x, int y, int n,
- int *out_len)
-{
- int force_filter = stbi_write_force_png_filter;
- int ctype[5] = {-1, 0, 4, 2, 6};
- unsigned char sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
- unsigned char *out, *o, *filt, *zlib;
- signed char *line_buffer;
- int j, zlen;
-
- if (stride_bytes == 0)
- stride_bytes = x * n;
-
- if (force_filter >= 5)
- {
- force_filter = -1;
- }
-
- filt = (unsigned char *)STBIW_MALLOC((x * n + 1) * y);
- if (!filt)
- return 0;
- line_buffer = (signed char *)STBIW_MALLOC(x * n);
- if (!line_buffer)
- {
- STBIW_FREE(filt);
- return 0;
- }
- for (j = 0; j < y; ++j)
- {
- int filter_type;
- if (force_filter > -1)
- {
- filter_type = force_filter;
- stbiw__encode_png_line((unsigned char *)(pixels), stride_bytes, x, y, j, n, force_filter, line_buffer);
- }
- else
- { // Estimate the best filter by running through all of them:
- int best_filter = 0, best_filter_val = 0x7fffffff, est, i;
- for (filter_type = 0; filter_type < 5; filter_type++)
- {
- stbiw__encode_png_line((unsigned char *)(pixels), stride_bytes, x, y, j, n, filter_type, line_buffer);
-
- // Estimate the entropy of the line using this filter; the less, the better.
- est = 0;
- for (i = 0; i < x * n; ++i)
- {
- est += abs((signed char)line_buffer[i]);
- }
- if (est < best_filter_val)
- {
- best_filter_val = est;
- best_filter = filter_type;
- }
- }
- if (filter_type != best_filter)
- { // If the last iteration already got us the best filter, don't redo it
- stbiw__encode_png_line((unsigned char *)(pixels), stride_bytes, x, y, j, n, best_filter, line_buffer);
- filter_type = best_filter;
- }
- }
- // when we get here, filter_type contains the filter type, and line_buffer contains the data
- filt[j * (x * n + 1)] = (unsigned char)filter_type;
- STBIW_MEMMOVE(filt + j * (x * n + 1) + 1, line_buffer, x * n);
- }
- STBIW_FREE(line_buffer);
- zlib = stbi_zlib_compress(filt, y * (x * n + 1), &zlen, stbi_write_png_compression_level);
- STBIW_FREE(filt);
- if (!zlib)
- return 0;
-
- // each tag requires 12 bytes of overhead
- out = (unsigned char *)STBIW_MALLOC(8 + 12 + 13 + 12 + zlen + 12);
- if (!out)
- return 0;
- *out_len = 8 + 12 + 13 + 12 + zlen + 12;
-
- o = out;
- STBIW_MEMMOVE(o, sig, 8);
- o += 8;
- stbiw__wp32(o, 13); // header length
- stbiw__wptag(o, "IHDR");
- stbiw__wp32(o, x);
- stbiw__wp32(o, y);
- *o++ = 8;
- *o++ = STBIW_UCHAR(ctype[n]);
- *o++ = 0;
- *o++ = 0;
- *o++ = 0;
- stbiw__wpcrc(&o, 13);
-
- stbiw__wp32(o, zlen);
- stbiw__wptag(o, "IDAT");
- STBIW_MEMMOVE(o, zlib, zlen);
- o += zlen;
- STBIW_FREE(zlib);
- stbiw__wpcrc(&o, zlen);
-
- stbiw__wp32(o, 0);
- stbiw__wptag(o, "IEND");
- stbiw__wpcrc(&o, 0);
-
- STBIW_ASSERT(o == out + *out_len);
-
- return out;
-}
-
-#ifndef STBI_WRITE_NO_STDIO
-STBIWDEF int stbi_write_png(char const *filename, int x, int y, int comp, const void *data, int stride_bytes)
-{
- FILE *f;
- int len;
- unsigned char *png = stbi_write_png_to_mem((const unsigned char *)data, stride_bytes, x, y, comp, &len);
- if (png == NULL)
- return 0;
-
- f = stbiw__fopen(filename, "wb");
- if (!f)
- {
- STBIW_FREE(png);
- return 0;
- }
- fwrite(png, 1, len, f);
- fclose(f);
- STBIW_FREE(png);
- return 1;
-}
-#endif
-
-STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data,
- int stride_bytes)
-{
- int len;
- unsigned char *png = stbi_write_png_to_mem((const unsigned char *)data, stride_bytes, x, y, comp, &len);
- if (png == NULL)
- return 0;
- func(context, png, len);
- STBIW_FREE(png);
- return 1;
-}
-
-/* ***************************************************************************
- *
- * JPEG writer
- *
- * This is based on Jon Olick's jo_jpeg.cpp:
- * public domain Simple, Minimalistic JPEG writer - http://www.jonolick.com/code.html
- */
-
-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, 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};
-
-static void stbiw__jpg_writeBits(stbi__write_context *s, int *bitBufP, int *bitCntP, const unsigned short *bs)
-{
- int bitBuf = *bitBufP, bitCnt = *bitCntP;
- bitCnt += bs[1];
- bitBuf |= bs[0] << (24 - bitCnt);
- while (bitCnt >= 8)
- {
- unsigned char c = (bitBuf >> 16) & 255;
- stbiw__putc(s, c);
- if (c == 255)
- {
- stbiw__putc(s, 0);
- }
- bitBuf <<= 8;
- bitCnt -= 8;
- }
- *bitBufP = bitBuf;
- *bitCntP = bitCnt;
-}
-
-static void stbiw__jpg_DCT(float *d0p, float *d1p, float *d2p, float *d3p, float *d4p, float *d5p, float *d6p,
- float *d7p)
-{
- float d0 = *d0p, d1 = *d1p, d2 = *d2p, d3 = *d3p, d4 = *d4p, d5 = *d5p, d6 = *d6p, d7 = *d7p;
- float z1, z2, z3, z4, z5, z11, z13;
-
- float tmp0 = d0 + d7;
- float tmp7 = d0 - d7;
- float tmp1 = d1 + d6;
- float tmp6 = d1 - d6;
- float tmp2 = d2 + d5;
- float tmp5 = d2 - d5;
- float tmp3 = d3 + d4;
- float tmp4 = d3 - d4;
-
- // Even part
- float tmp10 = tmp0 + tmp3; // phase 2
- float tmp13 = tmp0 - tmp3;
- float tmp11 = tmp1 + tmp2;
- float tmp12 = tmp1 - tmp2;
-
- d0 = tmp10 + tmp11; // phase 3
- d4 = tmp10 - tmp11;
-
- z1 = (tmp12 + tmp13) * 0.707106781f; // c4
- d2 = tmp13 + z1; // phase 5
- d6 = tmp13 - z1;
-
- // Odd part
- tmp10 = tmp4 + tmp5; // phase 2
- tmp11 = tmp5 + tmp6;
- tmp12 = tmp6 + tmp7;
-
- // The rotator is modified from fig 4-8 to avoid extra negations.
- z5 = (tmp10 - tmp12) * 0.382683433f; // c6
- z2 = tmp10 * 0.541196100f + z5; // c2-c6
- z4 = tmp12 * 1.306562965f + z5; // c2+c6
- z3 = tmp11 * 0.707106781f; // c4
-
- z11 = tmp7 + z3; // phase 5
- z13 = tmp7 - z3;
-
- *d5p = z13 + z2; // phase 6
- *d3p = z13 - z2;
- *d1p = z11 + z4;
- *d7p = z11 - z4;
-
- *d0p = d0;
- *d2p = d2;
- *d4p = d4;
- *d6p = d6;
-}
-
-static void stbiw__jpg_calcBits(int val, unsigned short bits[2])
-{
- int tmp1 = val < 0 ? -val : val;
- val = val < 0 ? val - 1 : val;
- bits[1] = 1;
- while (tmp1 >>= 1)
- {
- ++bits[1];
- }
- bits[0] = val & ((1 << bits[1]) - 1);
-}
-
-static int stbiw__jpg_processDU(stbi__write_context *s, int *bitBuf, int *bitCnt, float *CDU, int du_stride,
- float *fdtbl, int DC, const unsigned short HTDC[256][2],
- const unsigned short HTAC[256][2])
-{
- const unsigned short EOB[2] = {HTAC[0x00][0], HTAC[0x00][1]};
- const unsigned short M16zeroes[2] = {HTAC[0xF0][0], HTAC[0xF0][1]};
- int dataOff, i, j, n, diff, end0pos, x, y;
- int DU[64];
-
- // DCT rows
- for (dataOff = 0, n = du_stride * 8; dataOff < n; dataOff += du_stride)
- {
- 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]);
- }
- // DCT columns
- for (dataOff = 0; dataOff < 8; ++dataOff)
- {
- stbiw__jpg_DCT(&CDU[dataOff], &CDU[dataOff + du_stride], &CDU[dataOff + du_stride * 2],
- &CDU[dataOff + du_stride * 3], &CDU[dataOff + du_stride * 4], &CDU[dataOff + du_stride * 5],
- &CDU[dataOff + du_stride * 6], &CDU[dataOff + du_stride * 7]);
- }
- // Quantize/descale/zigzag the coefficients
- for (y = 0, j = 0; y < 8; ++y)
- {
- for (x = 0; x < 8; ++x, ++j)
- {
- float v;
- i = y * du_stride + x;
- v = CDU[i] * fdtbl[j];
- // DU[stbiw__jpg_ZigZag[j]] = (int)(v < 0 ? ceilf(v - 0.5f) : floorf(v + 0.5f));
- // ceilf() and floorf() are C99, not C89, but I /think/ they're not needed here anyway?
- DU[stbiw__jpg_ZigZag[j]] = (int)(v < 0 ? v - 0.5f : v + 0.5f);
- }
- }
-
- // Encode DC
- diff = DU[0] - DC;
- if (diff == 0)
- {
- stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTDC[0]);
- }
- else
- {
- unsigned short bits[2];
- stbiw__jpg_calcBits(diff, bits);
- stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTDC[bits[1]]);
- stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits);
- }
- // Encode ACs
- end0pos = 63;
- for (; (end0pos > 0) && (DU[end0pos] == 0); --end0pos)
- {
- }
- // end0pos = first element in reverse order !=0
- if (end0pos == 0)
- {
- stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB);
- return DU[0];
- }
- for (i = 1; i <= end0pos; ++i)
- {
- int startpos = i;
- int nrzeroes;
- unsigned short bits[2];
- for (; DU[i] == 0 && i <= end0pos; ++i)
- {
- }
- nrzeroes = i - startpos;
- if (nrzeroes >= 16)
- {
- int lng = nrzeroes >> 4;
- int nrmarker;
- for (nrmarker = 1; nrmarker <= lng; ++nrmarker)
- stbiw__jpg_writeBits(s, bitBuf, bitCnt, M16zeroes);
- nrzeroes &= 15;
- }
- stbiw__jpg_calcBits(DU[i], bits);
- stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTAC[(nrzeroes << 4) + bits[1]]);
- stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits);
- }
- if (end0pos != 63)
- {
- stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB);
- }
- return DU[0];
-}
-
-static int stbi_write_jpg_core(stbi__write_context *s, int width, int height, int comp, const void *data, int quality)
-{
- // Constants that don't pollute global namespace
- 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};
- static const unsigned char std_dc_luminance_values[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
- 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};
- static const unsigned char std_ac_luminance_values[] = {
- 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, 0x22, 0x71,
- 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, 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, subsample;
- 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;
- subsample = quality <= 90 ? 1 : 0;
- 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,
- (unsigned char)(subsample ? 0x22 : 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};
- 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;
- const unsigned char *dataR = (const unsigned char *)data;
- const unsigned char *dataG = dataR + ofsG;
- const unsigned char *dataB = dataR + ofsB;
- int x, y, pos;
- if (subsample)
- {
- for (y = 0; y < height; y += 16)
- {
- for (x = 0; x < width; x += 16)
- {
- float Y[256], U[256], V[256];
- for (row = y, pos = 0; row < y + 16; ++row)
- {
- // row >= height => use last input row
- int clamped_row = (row < height) ? row : height - 1;
- int base_p =
- (stbi__flip_vertically_on_write ? (height - 1 - clamped_row) : clamped_row) * width * comp;
- for (col = x; col < x + 16; ++col, ++pos)
- {
- // if col >= width => use pixel from last input column
- int p = base_p + ((col < width) ? col : (width - 1)) * comp;
- float r = dataR[p], g = dataG[p], b = dataB[p];
- Y[pos] = +0.29900f * r + 0.58700f * g + 0.11400f * b - 128;
- U[pos] = -0.16874f * r - 0.33126f * g + 0.50000f * b;
- V[pos] = +0.50000f * r - 0.41869f * g - 0.08131f * b;
- }
- }
- DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y + 0, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT);
- DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y + 8, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT);
- DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y + 128, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT);
- DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y + 136, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT);
-
- // subsample U,V
- {
- float subU[64], subV[64];
- int yy, xx;
- for (yy = 0, pos = 0; yy < 8; ++yy)
- {
- for (xx = 0; xx < 8; ++xx, ++pos)
- {
- int j = yy * 32 + xx * 2;
- subU[pos] = (U[j + 0] + U[j + 1] + U[j + 16] + U[j + 17]) * 0.25f;
- subV[pos] = (V[j + 0] + V[j + 1] + V[j + 16] + V[j + 17]) * 0.25f;
- }
- }
- DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, subU, 8, fdtbl_UV, DCU, UVDC_HT, UVAC_HT);
- DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, subV, 8, fdtbl_UV, DCV, UVDC_HT, UVAC_HT);
- }
- }
- }
- }
- else
- {
- for (y = 0; y < height; y += 8)
- {
- for (x = 0; x < width; x += 8)
- {
- float Y[64], U[64], V[64];
- for (row = y, pos = 0; row < y + 8; ++row)
- {
- // row >= height => use last input row
- int clamped_row = (row < height) ? row : height - 1;
- int base_p =
- (stbi__flip_vertically_on_write ? (height - 1 - clamped_row) : clamped_row) * width * comp;
- for (col = x; col < x + 8; ++col, ++pos)
- {
- // if col >= width => use pixel from last input column
- int p = base_p + ((col < width) ? col : (width - 1)) * comp;
- float r = dataR[p], g = dataG[p], b = dataB[p];
- Y[pos] = +0.29900f * r + 0.58700f * g + 0.11400f * b - 128;
- U[pos] = -0.16874f * r - 0.33126f * g + 0.50000f * b;
- V[pos] = +0.50000f * r - 0.41869f * g - 0.08131f * b;
- }
- }
-
- DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y, 8, fdtbl_Y, DCY, YDC_HT, YAC_HT);
- DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, U, 8, fdtbl_UV, DCU, UVDC_HT, UVAC_HT);
- DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, V, 8, 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 = {0};
- 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 = {0};
- 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
- 1.14 (2020-02-02) updated JPEG writer to downsample chroma channels
- 1.13
- 1.12
- 1.11 (2019-08-11)
-
- 1.10 (2019-02-07)
- support utf8 filenames in Windows; fix warnings and platform ifdefs
- 1.09 (2018-02-11)
- fix typo in zlib quality API, improve STB_I_W_STATIC in C++
- 1.08 (2018-01-29)
- 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 ???
- 1.02 (2016-04-02)
- avoid allocating large structures on the stack
- 1.01 (2016-01-16)
- STBIW_REALLOC_SIZED: support allocators with no realloc support
- avoid race-condition in crc initialization
- minor compile issues
- 1.00 (2015-09-14)
- installable file IO function
- 0.99 (2015-09-13)
- warning fixes; TGA rle support
- 0.98 (2015-04-08)
- added STBIW_MALLOC, STBIW_ASSERT etc
- 0.97 (2015-01-18)
- fixed HDR asserts, rewrote HDR rle logic
- 0.96 (2015-01-17)
- add HDR output
- fix monochrome BMP
- 0.95 (2014-08-17)
- add monochrome TGA output
- 0.94 (2014-05-31)
- rename private functions to avoid conflicts with stb_image.h
- 0.93 (2014-05-27)
- warning fixes
- 0.92 (2010-08-01)
- casts to unsigned char to fix warnings
- 0.91 (2010-07-17)
- first public release
- 0.90 first internal release
-*/
-
-/*
-------------------------------------------------------------------------------
-This software is available under 2 licenses -- choose whichever you prefer.
-------------------------------------------------------------------------------
-ALTERNATIVE A - MIT License
-Copyright (c) 2017 Sean Barrett
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
-of the Software, and to permit persons to whom the Software is furnished to do
-so, subject to the following conditions:
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-------------------------------------------------------------------------------
-ALTERNATIVE B - Public Domain (www.unlicense.org)
-This is free and unencumbered software released into the public domain.
-Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
-software, either in source code form or as a compiled binary, for any purpose,
-commercial or non-commercial, and by any means.
-In jurisdictions that recognize copyright laws, the author or authors of this
-software dedicate any and all copyright interest in the software to the public
-domain. We make this dedication for the benefit of the public at large and to
-the detriment of our heirs and successors. We intend this dedication to be an
-overt act of relinquishment in perpetuity of all present and future rights to
-this software under copyright law.
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
-ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-------------------------------------------------------------------------------
-*/
generated by cgit v1.2.3-101-g0448 (git 2.54.0) at 2026-07-25 22:59:29 +0000