ref: 997fe9a10272cd9c3a5f128213e64008ee663078
dir: /Raw_Demos/include/stb_image_write.h/
/* stb_image_write - v1.14 - 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; } 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__putc(stbi__write_context* s, unsigned char c) { s->func(s->context, &c, 1); } static void stbiw__write3(stbi__write_context* s, unsigned char a, unsigned char b, unsigned char c) { unsigned char arr[3]; arr[0] = a; arr[1] = b; arr[2] = c; s->func(s->context, arr, 3); } 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) s->func(s->context, &d[comp - 1], 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 s->func(s->context, d, 1); // 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) s->func(s->context, &d[comp - 1], 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); } 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; 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; 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); s->func(s->context, &header, 1); 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); s->func(s->context, &header, 1); stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin); } } } } 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; 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; 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; 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; 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; stbi__start_write_callbacks(&s, func, context); return stbi_write_jpg_core(&s, x, y, comp, (void*)data, quality); } #ifndef STBI_WRITE_NO_STDIO STBIWDEF int stbi_write_jpg(char const* filename, int x, int y, int comp, const void* data, int quality) { stbi__write_context s; if (stbi__start_write_file(&s, filename)) { int r = stbi_write_jpg_core(&s, x, y, comp, data, quality); stbi__end_write_file(&s); return r; } else return 0; } #endif #endif // STB_IMAGE_WRITE_IMPLEMENTATION /* Revision history 1.14 (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. ------------------------------------------------------------------------------ */