ref: 1184569de9ddfbe78aae169ee3a5faf13edff9a0
parent: 567796e9236207d51b74113b75720059353063fb
author: David <gek@katherine>
date: Wed Mar 3 12:54:34 EST 2021
Raw Demos
--- /dev/null
+++ b/SDL_Examples/include/stb_image_write.h
@@ -1,0 +1,1733 @@
+/* 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.
+------------------------------------------------------------------------------
+*/