| /* stb_image_write - v1.09 - public domain - |
| http://nothings.org/stb/stb_image_write.h 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. |
| |
| If using a modern Microsoft Compiler, non-safe versions of CRT calls may |
| cause compilation warnings or even errors. To avoid this, also before |
| #including, |
| |
| #define STBI_MSC_SECURE_CRT |
| |
| ABOUT: |
| |
| This header file is a library for writing images to C stdio. It could be |
| adapted to write to memory or a general streaming interface; let me know. |
| |
| 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), |
| |
| 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 |
| |
| // 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); |
| #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__flip_vertically_on_write = 0; |
| 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__flip_vertically_on_write = 0; |
| int stbi_write_tga_with_rle = 1; |
| int stbi_write_force_png_filter = -1; |
| #endif |
| |
| 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); |
| } |
| |
| static int stbi__start_write_file(stbi__write_context *s, |
| const char *filename) { |
| FILE *f; |
| #ifdef STBI_MSC_SECURE_CRT |
| if (fopen_s(&f, filename, "wb")) f = NULL; |
| #else |
| f = fopen(filename, "wb"); |
| #endif |
| 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)) |
| |
| 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); |
| } |
| } |
| |
| 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); |
| } |
| |
| 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); |
| } |
| |
| 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 STBI_MSC_SECURE_CRT |
| len = sprintf_s( |
| 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) * x); |
| 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 *)(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 |
| |
| 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(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) { |
| 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; |
| } |
| |
| #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; |
| for (i = 0; i < n; ++i) { |
| switch (type) { |
| case 0: |
| line_buffer[i] = z[i]; |
| break; |
| 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; |
| } |
| } |
| for (i = n; i < width * n; ++i) { |
| switch (type) { |
| case 0: |
| line_buffer[i] = z[i]; |
| break; |
| case 1: |
| line_buffer[i] = z[i] - z[i - n]; |
| break; |
| case 2: |
| line_buffer[i] = z[i] - z[i - signed_stride]; |
| break; |
| case 3: |
| line_buffer[i] = z[i] - ((z[i - n] + z[i - signed_stride]) >> 1); |
| break; |
| case 4: |
| line_buffer[i] = z[i] - stbiw__paeth(z[i - n], z[i - signed_stride], |
| z[i - signed_stride - n]); |
| break; |
| case 5: |
| line_buffer[i] = z[i] - (z[i - n] >> 1); |
| break; |
| case 6: |
| line_buffer[i] = z[i] - stbiw__paeth(z[i - n], 0, 0); |
| break; |
| } |
| } |
| } |
| |
| unsigned char *stbi_write_png_to_mem(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(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(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(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((unsigned char *)data, |
| stride_bytes, x, y, comp, &len); |
| if (png == NULL) return 0; |
| #ifdef STBI_MSC_SECURE_CRT |
| if (fopen_s(&f, filename, "wb")) f = NULL; |
| #else |
| f = fopen(filename, "wb"); |
| #endif |
| 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((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, 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, diff, end0pos; |
| int DU[64]; |
| |
| // DCT rows |
| for (dataOff = 0; dataOff < 64; dataOff += 8) { |
| 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 + 8], &CDU[dataOff + 16], |
| &CDU[dataOff + 24], &CDU[dataOff + 32], &CDU[dataOff + 40], |
| &CDU[dataOff + 48], &CDU[dataOff + 56]); |
| } |
| // Quantize/descale/zigzag the coefficients |
| for (i = 0; i < 64; ++i) { |
| float v = CDU[i] * fdtbl[i]; |
| // DU[stbiw__jpg_ZigZag[i]] = (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[i]] = (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; |
| float fdtbl_Y[64], fdtbl_UV[64]; |
| unsigned char YTable[64], UVTable[64]; |
| |
| if (!data || !width || !height || comp > 4 || comp < 1) { |
| return 0; |
| } |
| |
| quality = quality ? quality : 90; |
| quality = quality < 1 ? 1 : quality > 100 ? 100 : quality; |
| quality = quality < 50 ? 5000 / quality : 200 - quality * 2; |
| |
| for (i = 0; i < 64; ++i) { |
| int uvti, yti = (YQT[i] * quality + 50) / 100; |
| YTable[stbiw__jpg_ZigZag[i]] = |
| (unsigned char)(yti < 1 ? 1 : yti > 255 ? 255 : yti); |
| uvti = (UVQT[i] * quality + 50) / 100; |
| UVTable[stbiw__jpg_ZigZag[i]] = |
| (unsigned char)(uvti < 1 ? 1 : uvti > 255 ? 255 : uvti); |
| } |
| |
| for (row = 0, k = 0; row < 8; ++row) { |
| for (col = 0; col < 8; ++col, ++k) { |
| fdtbl_Y[k] = 1 / (YTable[stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]); |
| fdtbl_UV[k] = 1 / (UVTable[stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]); |
| } |
| } |
| |
| // Write Headers |
| { |
| static const unsigned char head0[] = { |
| 0xFF, 0xD8, 0xFF, 0xE0, 0, 0x10, 'J', 'F', 'I', 'F', 0, 1, 1, |
| 0, 0, 1, 0, 1, 0, 0, 0xFF, 0xDB, 0, 0x84, 0}; |
| static const unsigned char head2[] = {0xFF, 0xDA, 0, 0xC, 3, 1, 0, |
| 2, 0x11, 3, 0x11, 0, 0x3F, 0}; |
| const unsigned char head1[] = {0xFF, |
| 0xC0, |
| 0, |
| 0x11, |
| 8, |
| (unsigned char)(height >> 8), |
| STBIW_UCHAR(height), |
| (unsigned char)(width >> 8), |
| STBIW_UCHAR(width), |
| 3, |
| 1, |
| 0x11, |
| 0, |
| 2, |
| 0x11, |
| 1, |
| 3, |
| 0x11, |
| 1, |
| 0xFF, |
| 0xC4, |
| 0x01, |
| 0xA2, |
| 0}; |
| s->func(s->context, (void *)head0, sizeof(head0)); |
| s->func(s->context, (void *)YTable, sizeof(YTable)); |
| stbiw__putc(s, 1); |
| s->func(s->context, UVTable, sizeof(UVTable)); |
| s->func(s->context, (void *)head1, sizeof(head1)); |
| s->func(s->context, (void *)(std_dc_luminance_nrcodes + 1), |
| sizeof(std_dc_luminance_nrcodes) - 1); |
| s->func(s->context, (void *)std_dc_luminance_values, |
| sizeof(std_dc_luminance_values)); |
| stbiw__putc(s, 0x10); // HTYACinfo |
| s->func(s->context, (void *)(std_ac_luminance_nrcodes + 1), |
| sizeof(std_ac_luminance_nrcodes) - 1); |
| s->func(s->context, (void *)std_ac_luminance_values, |
| sizeof(std_ac_luminance_values)); |
| stbiw__putc(s, 1); // HTUDCinfo |
| s->func(s->context, (void *)(std_dc_chrominance_nrcodes + 1), |
| sizeof(std_dc_chrominance_nrcodes) - 1); |
| s->func(s->context, (void *)std_dc_chrominance_values, |
| sizeof(std_dc_chrominance_values)); |
| stbiw__putc(s, 0x11); // HTUACinfo |
| s->func(s->context, (void *)(std_ac_chrominance_nrcodes + 1), |
| sizeof(std_ac_chrominance_nrcodes) - 1); |
| s->func(s->context, (void *)std_ac_chrominance_values, |
| sizeof(std_ac_chrominance_values)); |
| s->func(s->context, (void *)head2, sizeof(head2)); |
| } |
| |
| // Encode 8x8 macroblocks |
| { |
| static const unsigned short fillBits[] = {0x7F, 7}; |
| const unsigned char *imageData = (const unsigned char *)data; |
| int DCY = 0, DCU = 0, DCV = 0; |
| int bitBuf = 0, bitCnt = 0; |
| // comp == 2 is grey+alpha (alpha is ignored) |
| int ofsG = comp > 2 ? 1 : 0, ofsB = comp > 2 ? 2 : 0; |
| int x, y, pos; |
| for (y = 0; y < height; y += 8) { |
| for (x = 0; x < width; x += 8) { |
| float YDU[64], UDU[64], VDU[64]; |
| for (row = y, pos = 0; row < y + 8; ++row) { |
| for (col = x; col < x + 8; ++col, ++pos) { |
| int p = (stbi__flip_vertically_on_write ? height - 1 - row : row) * |
| width * comp + |
| col * comp; |
| float r, g, b; |
| if (row >= height) { |
| p -= width * comp * (row + 1 - height); |
| } |
| if (col >= width) { |
| p -= comp * (col + 1 - width); |
| } |
| |
| r = imageData[p + 0]; |
| g = imageData[p + ofsG]; |
| b = imageData[p + ofsB]; |
| YDU[pos] = +0.29900f * r + 0.58700f * g + 0.11400f * b - 128; |
| UDU[pos] = -0.16874f * r - 0.33126f * g + 0.50000f * b; |
| VDU[pos] = +0.50000f * r - 0.41869f * g - 0.08131f * b; |
| } |
| } |
| |
| DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, YDU, fdtbl_Y, DCY, |
| YDC_HT, YAC_HT); |
| DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, UDU, fdtbl_UV, DCU, |
| UVDC_HT, UVAC_HT); |
| DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, VDU, fdtbl_UV, DCV, |
| UVDC_HT, UVAC_HT); |
| } |
| } |
| |
| // Do the bit alignment of the EOI marker |
| stbiw__jpg_writeBits(s, &bitBuf, &bitCnt, fillBits); |
| } |
| |
| // EOI |
| stbiw__putc(s, 0xFF); |
| stbiw__putc(s, 0xD9); |
| |
| return 1; |
| } |
| |
| STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, |
| int y, int comp, const void *data, |
| int quality) { |
| stbi__write_context s; |
| stbi__start_write_callbacks(&s, func, context); |
| return stbi_write_jpg_core(&s, x, y, comp, (void *)data, quality); |
| } |
| |
| #ifndef STBI_WRITE_NO_STDIO |
| STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, |
| const void *data, int quality) { |
| stbi__write_context s; |
| if (stbi__start_write_file(&s, filename)) { |
| int r = stbi_write_jpg_core(&s, x, y, comp, data, quality); |
| stbi__end_write_file(&s); |
| return r; |
| } else |
| return 0; |
| } |
| #endif |
| |
| #endif // STB_IMAGE_WRITE_IMPLEMENTATION |
| |
| /* Revision history |
| 1.09 (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. |
| ------------------------------------------------------------------------------ |
| */ |