1 | /* stb_image_write - v1.14 - public domain - http://nothings.org/stb |
2 | writes out PNG/BMP/TGA/JPEG/HDR images to C stdio - Sean Barrett 2010-2015 |
3 | no warranty implied; use at your own risk |
4 | |
5 | Before #including, |
6 | |
7 | #define STB_IMAGE_WRITE_IMPLEMENTATION |
8 | |
9 | in the file that you want to have the implementation. |
10 | |
11 | Will probably not work correctly with strict-aliasing optimizations. |
12 | |
13 | ABOUT: |
14 | |
15 | This header file is a library for writing images to C stdio or a callback. |
16 | |
17 | The PNG output is not optimal; it is 20-50% larger than the file |
18 | written by a decent optimizing implementation; though providing a custom |
19 | zlib compress function (see STBIW_ZLIB_COMPRESS) can mitigate that. |
20 | This library is designed for source code compactness and simplicity, |
21 | not optimal image file size or run-time performance. |
22 | |
23 | BUILDING: |
24 | |
25 | You can #define STBIW_ASSERT(x) before the #include to avoid using assert.h. |
26 | You can #define STBIW_MALLOC(), STBIW_REALLOC(), and STBIW_FREE() to replace |
27 | malloc,realloc,free. |
28 | You can #define STBIW_MEMMOVE() to replace memmove() |
29 | You can #define STBIW_ZLIB_COMPRESS to use a custom zlib-style compress function |
30 | for PNG compression (instead of the builtin one), it must have the following signature: |
31 | unsigned char * my_compress(unsigned char *data, int data_len, int *out_len, int quality); |
32 | The returned data will be freed with STBIW_FREE() (free() by default), |
33 | so it must be heap allocated with STBIW_MALLOC() (malloc() by default), |
34 | |
35 | UNICODE: |
36 | |
37 | If compiling for Windows and you wish to use Unicode filenames, compile |
38 | with |
39 | #define STBIW_WINDOWS_UTF8 |
40 | and pass utf8-encoded filenames. Call stbiw_convert_wchar_to_utf8 to convert |
41 | Windows wchar_t filenames to utf8. |
42 | |
43 | USAGE: |
44 | |
45 | There are five functions, one for each image file format: |
46 | |
47 | int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes); |
48 | int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data); |
49 | int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data); |
50 | int stbi_write_jpg(char const *filename, int w, int h, int comp, const void *data, int quality); |
51 | int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data); |
52 | |
53 | void stbi_flip_vertically_on_write(int flag); // flag is non-zero to flip data vertically |
54 | |
55 | There are also five equivalent functions that use an arbitrary write function. You are |
56 | expected to open/close your file-equivalent before and after calling these: |
57 | |
58 | 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); |
59 | int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); |
60 | int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); |
61 | int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data); |
62 | int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality); |
63 | |
64 | where the callback is: |
65 | void stbi_write_func(void *context, void *data, int size); |
66 | |
67 | You can configure it with these global variables: |
68 | int stbi_write_tga_with_rle; // defaults to true; set to 0 to disable RLE |
69 | int stbi_write_png_compression_level; // defaults to 8; set to higher for more compression |
70 | int stbi_write_force_png_filter; // defaults to -1; set to 0..5 to force a filter mode |
71 | |
72 | |
73 | You can define STBI_WRITE_NO_STDIO to disable the file variant of these |
74 | functions, so the library will not use stdio.h at all. However, this will |
75 | also disable HDR writing, because it requires stdio for formatted output. |
76 | |
77 | Each function returns 0 on failure and non-0 on success. |
78 | |
79 | The functions create an image file defined by the parameters. The image |
80 | is a rectangle of pixels stored from left-to-right, top-to-bottom. |
81 | Each pixel contains 'comp' channels of data stored interleaved with 8-bits |
82 | per channel, in the following order: 1=Y, 2=YA, 3=RGB, 4=RGBA. (Y is |
83 | monochrome color.) The rectangle is 'w' pixels wide and 'h' pixels tall. |
84 | The *data pointer points to the first byte of the top-left-most pixel. |
85 | For PNG, "stride_in_bytes" is the distance in bytes from the first byte of |
86 | a row of pixels to the first byte of the next row of pixels. |
87 | |
88 | PNG creates output files with the same number of components as the input. |
89 | The BMP format expands Y to RGB in the file format and does not |
90 | output alpha. |
91 | |
92 | PNG supports writing rectangles of data even when the bytes storing rows of |
93 | data are not consecutive in memory (e.g. sub-rectangles of a larger image), |
94 | by supplying the stride between the beginning of adjacent rows. The other |
95 | formats do not. (Thus you cannot write a native-format BMP through the BMP |
96 | writer, both because it is in BGR order and because it may have padding |
97 | at the end of the line.) |
98 | |
99 | PNG allows you to set the deflate compression level by setting the global |
100 | variable 'stbi_write_png_compression_level' (it defaults to 8). |
101 | |
102 | HDR expects linear float data. Since the format is always 32-bit rgb(e) |
103 | data, alpha (if provided) is discarded, and for monochrome data it is |
104 | replicated across all three channels. |
105 | |
106 | TGA supports RLE or non-RLE compressed data. To use non-RLE-compressed |
107 | data, set the global variable 'stbi_write_tga_with_rle' to 0. |
108 | |
109 | JPEG does ignore alpha channels in input data; quality is between 1 and 100. |
110 | Higher quality looks better but results in a bigger image. |
111 | JPEG baseline (no JPEG progressive). |
112 | |
113 | CREDITS: |
114 | |
115 | |
116 | Sean Barrett - PNG/BMP/TGA |
117 | Baldur Karlsson - HDR |
118 | Jean-Sebastien Guay - TGA monochrome |
119 | Tim Kelsey - misc enhancements |
120 | Alan Hickman - TGA RLE |
121 | Emmanuel Julien - initial file IO callback implementation |
122 | Jon Olick - original jo_jpeg.cpp code |
123 | Daniel Gibson - integrate JPEG, allow external zlib |
124 | Aarni Koskela - allow choosing PNG filter |
125 | |
126 | bugfixes: |
127 | github:Chribba |
128 | Guillaume Chereau |
129 | github:jry2 |
130 | github:romigrou |
131 | Sergio Gonzalez |
132 | Jonas Karlsson |
133 | Filip Wasil |
134 | Thatcher Ulrich |
135 | github:poppolopoppo |
136 | Patrick Boettcher |
137 | github:xeekworx |
138 | Cap Petschulat |
139 | Simon Rodriguez |
140 | Ivan Tikhonov |
141 | github:ignotion |
142 | Adam Schackart |
143 | |
144 | LICENSE |
145 | |
146 | See end of file for license information. |
147 | |
148 | */ |
149 | |
150 | #ifndef INCLUDE_STB_IMAGE_WRITE_H |
151 | #define INCLUDE_STB_IMAGE_WRITE_H |
152 | |
153 | #include <stdlib.h> |
154 | |
155 | // if STB_IMAGE_WRITE_STATIC causes problems, try defining STBIWDEF to 'inline' or 'static inline' |
156 | #ifndef STBIWDEF |
157 | #ifdef STB_IMAGE_WRITE_STATIC |
158 | #define STBIWDEF static |
159 | #else |
160 | #ifdef __cplusplus |
161 | #define STBIWDEF extern "C" |
162 | #else |
163 | #define STBIWDEF extern |
164 | #endif |
165 | #endif |
166 | #endif |
167 | |
168 | #ifndef STB_IMAGE_WRITE_STATIC // C++ forbids static forward declarations |
169 | extern int stbi_write_tga_with_rle; |
170 | extern int stbi_write_png_compression_level; |
171 | extern int stbi_write_force_png_filter; |
172 | #endif |
173 | |
174 | #ifndef STBI_WRITE_NO_STDIO |
175 | STBIWDEF int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes); |
176 | STBIWDEF int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data); |
177 | STBIWDEF int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data); |
178 | STBIWDEF int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data); |
179 | STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const void *data, int quality); |
180 | |
181 | #ifdef STBI_WINDOWS_UTF8 |
182 | STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input); |
183 | #endif |
184 | #endif |
185 | |
186 | typedef void stbi_write_func(void *context, void *data, int size); |
187 | |
188 | 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); |
189 | STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); |
190 | STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); |
191 | STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data); |
192 | STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality); |
193 | |
194 | STBIWDEF void stbi_flip_vertically_on_write(int flip_boolean); |
195 | |
196 | #endif//INCLUDE_STB_IMAGE_WRITE_H |
197 | |
198 | #ifdef STB_IMAGE_WRITE_IMPLEMENTATION |
199 | |
200 | #ifdef _WIN32 |
201 | #ifndef _CRT_SECURE_NO_WARNINGS |
202 | #define _CRT_SECURE_NO_WARNINGS |
203 | #endif |
204 | #ifndef _CRT_NONSTDC_NO_DEPRECATE |
205 | #define _CRT_NONSTDC_NO_DEPRECATE |
206 | #endif |
207 | #endif |
208 | |
209 | #ifndef STBI_WRITE_NO_STDIO |
210 | #include <stdio.h> |
211 | #endif // STBI_WRITE_NO_STDIO |
212 | |
213 | #include <stdarg.h> |
214 | #include <stdlib.h> |
215 | #include <string.h> |
216 | #include <math.h> |
217 | |
218 | #if defined(STBIW_MALLOC) && defined(STBIW_FREE) && (defined(STBIW_REALLOC) || defined(STBIW_REALLOC_SIZED)) |
219 | // ok |
220 | #elif !defined(STBIW_MALLOC) && !defined(STBIW_FREE) && !defined(STBIW_REALLOC) && !defined(STBIW_REALLOC_SIZED) |
221 | // ok |
222 | #else |
223 | #error "Must define all or none of STBIW_MALLOC, STBIW_FREE, and STBIW_REALLOC (or STBIW_REALLOC_SIZED)." |
224 | #endif |
225 | |
226 | #ifndef STBIW_MALLOC |
227 | #define STBIW_MALLOC(sz) malloc(sz) |
228 | #define STBIW_REALLOC(p,newsz) realloc(p,newsz) |
229 | #define STBIW_FREE(p) free(p) |
230 | #endif |
231 | |
232 | #ifndef STBIW_REALLOC_SIZED |
233 | #define STBIW_REALLOC_SIZED(p,oldsz,newsz) STBIW_REALLOC(p,newsz) |
234 | #endif |
235 | |
236 | |
237 | #ifndef STBIW_MEMMOVE |
238 | #define STBIW_MEMMOVE(a,b,sz) memmove(a,b,sz) |
239 | #endif |
240 | |
241 | |
242 | #ifndef STBIW_ASSERT |
243 | #include <assert.h> |
244 | #define STBIW_ASSERT(x) assert(x) |
245 | #endif |
246 | |
247 | #define STBIW_UCHAR(x) (unsigned char) ((x) & 0xff) |
248 | |
249 | #ifdef STB_IMAGE_WRITE_STATIC |
250 | static int stbi_write_png_compression_level = 8; |
251 | static int stbi_write_tga_with_rle = 1; |
252 | static int stbi_write_force_png_filter = -1; |
253 | #else |
254 | int stbi_write_png_compression_level = 8; |
255 | int stbi_write_tga_with_rle = 1; |
256 | int stbi_write_force_png_filter = -1; |
257 | #endif |
258 | |
259 | static int stbi__flip_vertically_on_write = 0; |
260 | |
261 | STBIWDEF void stbi_flip_vertically_on_write(int flag) |
262 | { |
263 | stbi__flip_vertically_on_write = flag; |
264 | } |
265 | |
266 | typedef struct |
267 | { |
268 | stbi_write_func *func; |
269 | void *context; |
270 | } stbi__write_context; |
271 | |
272 | // initialize a callback-based context |
273 | static void stbi__start_write_callbacks(stbi__write_context *s, stbi_write_func *c, void *context) |
274 | { |
275 | s->func = c; |
276 | s->context = context; |
277 | } |
278 | |
279 | #ifndef STBI_WRITE_NO_STDIO |
280 | |
281 | static void stbi__stdio_write(void *context, void *data, int size) |
282 | { |
283 | fwrite(data,1,size,(FILE*) context); |
284 | } |
285 | |
286 | #if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8) |
287 | #ifdef __cplusplus |
288 | #define STBIW_EXTERN extern "C" |
289 | #else |
290 | #define STBIW_EXTERN extern |
291 | #endif |
292 | STBIW_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags, const char *str, int cbmb, wchar_t *widestr, int cchwide); |
293 | 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); |
294 | |
295 | STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input) |
296 | { |
297 | return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int) bufferlen, NULL, NULL); |
298 | } |
299 | #endif |
300 | |
301 | static FILE *stbiw__fopen(char const *filename, char const *mode) |
302 | { |
303 | FILE *f; |
304 | #if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8) |
305 | wchar_t wMode[64]; |
306 | wchar_t wFilename[1024]; |
307 | if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename))) |
308 | return 0; |
309 | |
310 | if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode))) |
311 | return 0; |
312 | |
313 | #if _MSC_VER >= 1400 |
314 | if (0 != _wfopen_s(&f, wFilename, wMode)) |
315 | f = 0; |
316 | #else |
317 | f = _wfopen(wFilename, wMode); |
318 | #endif |
319 | |
320 | #elif defined(_MSC_VER) && _MSC_VER >= 1400 |
321 | if (0 != fopen_s(&f, filename, mode)) |
322 | f=0; |
323 | #else |
324 | f = fopen(filename, mode); |
325 | #endif |
326 | return f; |
327 | } |
328 | |
329 | static int stbi__start_write_file(stbi__write_context *s, const char *filename) |
330 | { |
331 | FILE *f = stbiw__fopen(filename, "wb" ); |
332 | stbi__start_write_callbacks(s, stbi__stdio_write, (void *) f); |
333 | return f != NULL; |
334 | } |
335 | |
336 | static void stbi__end_write_file(stbi__write_context *s) |
337 | { |
338 | fclose((FILE *)s->context); |
339 | } |
340 | |
341 | #endif // !STBI_WRITE_NO_STDIO |
342 | |
343 | typedef unsigned int stbiw_uint32; |
344 | typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1]; |
345 | |
346 | static void stbiw__writefv(stbi__write_context *s, const char *fmt, va_list v) |
347 | { |
348 | while (*fmt) { |
349 | switch (*fmt++) { |
350 | case ' ': break; |
351 | case '1': { unsigned char x = STBIW_UCHAR(va_arg(v, int)); |
352 | s->func(s->context,&x,1); |
353 | break; } |
354 | case '2': { int x = va_arg(v,int); |
355 | unsigned char b[2]; |
356 | b[0] = STBIW_UCHAR(x); |
357 | b[1] = STBIW_UCHAR(x>>8); |
358 | s->func(s->context,b,2); |
359 | break; } |
360 | case '4': { stbiw_uint32 x = va_arg(v,int); |
361 | unsigned char b[4]; |
362 | b[0]=STBIW_UCHAR(x); |
363 | b[1]=STBIW_UCHAR(x>>8); |
364 | b[2]=STBIW_UCHAR(x>>16); |
365 | b[3]=STBIW_UCHAR(x>>24); |
366 | s->func(s->context,b,4); |
367 | break; } |
368 | default: |
369 | STBIW_ASSERT(0); |
370 | return; |
371 | } |
372 | } |
373 | } |
374 | |
375 | static void stbiw__writef(stbi__write_context *s, const char *fmt, ...) |
376 | { |
377 | va_list v; |
378 | va_start(v, fmt); |
379 | stbiw__writefv(s, fmt, v); |
380 | va_end(v); |
381 | } |
382 | |
383 | static void stbiw__putc(stbi__write_context *s, unsigned char c) |
384 | { |
385 | s->func(s->context, &c, 1); |
386 | } |
387 | |
388 | static void stbiw__write3(stbi__write_context *s, unsigned char a, unsigned char b, unsigned char c) |
389 | { |
390 | unsigned char arr[3]; |
391 | arr[0] = a; arr[1] = b; arr[2] = c; |
392 | s->func(s->context, arr, 3); |
393 | } |
394 | |
395 | static void stbiw__write_pixel(stbi__write_context *s, int rgb_dir, int comp, int write_alpha, int expand_mono, unsigned char *d) |
396 | { |
397 | unsigned char bg[3] = { 255, 0, 255}, px[3]; |
398 | int k; |
399 | |
400 | if (write_alpha < 0) |
401 | s->func(s->context, &d[comp - 1], 1); |
402 | |
403 | switch (comp) { |
404 | case 2: // 2 pixels = mono + alpha, alpha is written separately, so same as 1-channel case |
405 | case 1: |
406 | if (expand_mono) |
407 | stbiw__write3(s, d[0], d[0], d[0]); // monochrome bmp |
408 | else |
409 | s->func(s->context, d, 1); // monochrome TGA |
410 | break; |
411 | case 4: |
412 | if (!write_alpha) { |
413 | // composite against pink background |
414 | for (k = 0; k < 3; ++k) |
415 | px[k] = bg[k] + ((d[k] - bg[k]) * d[3]) / 255; |
416 | stbiw__write3(s, px[1 - rgb_dir], px[1], px[1 + rgb_dir]); |
417 | break; |
418 | } |
419 | /* FALLTHROUGH */ |
420 | case 3: |
421 | stbiw__write3(s, d[1 - rgb_dir], d[1], d[1 + rgb_dir]); |
422 | break; |
423 | } |
424 | if (write_alpha > 0) |
425 | s->func(s->context, &d[comp - 1], 1); |
426 | } |
427 | |
428 | 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) |
429 | { |
430 | stbiw_uint32 zero = 0; |
431 | int i,j, j_end; |
432 | |
433 | if (y <= 0) |
434 | return; |
435 | |
436 | if (stbi__flip_vertically_on_write) |
437 | vdir *= -1; |
438 | |
439 | if (vdir < 0) { |
440 | j_end = -1; j = y-1; |
441 | } else { |
442 | j_end = y; j = 0; |
443 | } |
444 | |
445 | for (; j != j_end; j += vdir) { |
446 | for (i=0; i < x; ++i) { |
447 | unsigned char *d = (unsigned char *) data + (j*x+i)*comp; |
448 | stbiw__write_pixel(s, rgb_dir, comp, write_alpha, expand_mono, d); |
449 | } |
450 | s->func(s->context, &zero, scanline_pad); |
451 | } |
452 | } |
453 | |
454 | 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, ...) |
455 | { |
456 | if (y < 0 || x < 0) { |
457 | return 0; |
458 | } else { |
459 | va_list v; |
460 | va_start(v, fmt); |
461 | stbiw__writefv(s, fmt, v); |
462 | va_end(v); |
463 | stbiw__write_pixels(s,rgb_dir,vdir,x,y,comp,data,alpha,pad, expand_mono); |
464 | return 1; |
465 | } |
466 | } |
467 | |
468 | static int stbi_write_bmp_core(stbi__write_context *s, int x, int y, int comp, const void *data) |
469 | { |
470 | int pad = (-x*3) & 3; |
471 | return stbiw__outfile(s,-1,-1,x,y,comp,1,(void *) data,0,pad, |
472 | "11 4 22 4" "4 44 22 444444" , |
473 | 'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40, // file header |
474 | 40, x,y, 1,24, 0,0,0,0,0,0); // bitmap header |
475 | } |
476 | |
477 | STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data) |
478 | { |
479 | stbi__write_context s; |
480 | stbi__start_write_callbacks(&s, func, context); |
481 | return stbi_write_bmp_core(&s, x, y, comp, data); |
482 | } |
483 | |
484 | #ifndef STBI_WRITE_NO_STDIO |
485 | STBIWDEF int stbi_write_bmp(char const *filename, int x, int y, int comp, const void *data) |
486 | { |
487 | stbi__write_context s; |
488 | if (stbi__start_write_file(&s,filename)) { |
489 | int r = stbi_write_bmp_core(&s, x, y, comp, data); |
490 | stbi__end_write_file(&s); |
491 | return r; |
492 | } else |
493 | return 0; |
494 | } |
495 | #endif //!STBI_WRITE_NO_STDIO |
496 | |
497 | static int stbi_write_tga_core(stbi__write_context *s, int x, int y, int comp, void *data) |
498 | { |
499 | int has_alpha = (comp == 2 || comp == 4); |
500 | int colorbytes = has_alpha ? comp-1 : comp; |
501 | int format = colorbytes < 2 ? 3 : 2; // 3 color channels (RGB/RGBA) = 2, 1 color channel (Y/YA) = 3 |
502 | |
503 | if (y < 0 || x < 0) |
504 | return 0; |
505 | |
506 | if (!stbi_write_tga_with_rle) { |
507 | return stbiw__outfile(s, -1, -1, x, y, comp, 0, (void *) data, has_alpha, 0, |
508 | "111 221 2222 11" , 0, 0, format, 0, 0, 0, 0, 0, x, y, (colorbytes + has_alpha) * 8, has_alpha * 8); |
509 | } else { |
510 | int i,j,k; |
511 | int jend, jdir; |
512 | |
513 | 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); |
514 | |
515 | if (stbi__flip_vertically_on_write) { |
516 | j = 0; |
517 | jend = y; |
518 | jdir = 1; |
519 | } else { |
520 | j = y-1; |
521 | jend = -1; |
522 | jdir = -1; |
523 | } |
524 | for (; j != jend; j += jdir) { |
525 | unsigned char *row = (unsigned char *) data + j * x * comp; |
526 | int len; |
527 | |
528 | for (i = 0; i < x; i += len) { |
529 | unsigned char *begin = row + i * comp; |
530 | int diff = 1; |
531 | len = 1; |
532 | |
533 | if (i < x - 1) { |
534 | ++len; |
535 | diff = memcmp(begin, row + (i + 1) * comp, comp); |
536 | if (diff) { |
537 | const unsigned char *prev = begin; |
538 | for (k = i + 2; k < x && len < 128; ++k) { |
539 | if (memcmp(prev, row + k * comp, comp)) { |
540 | prev += comp; |
541 | ++len; |
542 | } else { |
543 | --len; |
544 | break; |
545 | } |
546 | } |
547 | } else { |
548 | for (k = i + 2; k < x && len < 128; ++k) { |
549 | if (!memcmp(begin, row + k * comp, comp)) { |
550 | ++len; |
551 | } else { |
552 | break; |
553 | } |
554 | } |
555 | } |
556 | } |
557 | |
558 | if (diff) { |
559 | unsigned char = STBIW_UCHAR(len - 1); |
560 | s->func(s->context, &header, 1); |
561 | for (k = 0; k < len; ++k) { |
562 | stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin + k * comp); |
563 | } |
564 | } else { |
565 | unsigned char = STBIW_UCHAR(len - 129); |
566 | s->func(s->context, &header, 1); |
567 | stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin); |
568 | } |
569 | } |
570 | } |
571 | } |
572 | return 1; |
573 | } |
574 | |
575 | STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data) |
576 | { |
577 | stbi__write_context s; |
578 | stbi__start_write_callbacks(&s, func, context); |
579 | return stbi_write_tga_core(&s, x, y, comp, (void *) data); |
580 | } |
581 | |
582 | #ifndef STBI_WRITE_NO_STDIO |
583 | STBIWDEF int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data) |
584 | { |
585 | stbi__write_context s; |
586 | if (stbi__start_write_file(&s,filename)) { |
587 | int r = stbi_write_tga_core(&s, x, y, comp, (void *) data); |
588 | stbi__end_write_file(&s); |
589 | return r; |
590 | } else |
591 | return 0; |
592 | } |
593 | #endif |
594 | |
595 | // ************************************************************************************************* |
596 | // Radiance RGBE HDR writer |
597 | // by Baldur Karlsson |
598 | |
599 | #define stbiw__max(a, b) ((a) > (b) ? (a) : (b)) |
600 | |
601 | static void stbiw__linear_to_rgbe(unsigned char *rgbe, float *linear) |
602 | { |
603 | int exponent; |
604 | float maxcomp = stbiw__max(linear[0], stbiw__max(linear[1], linear[2])); |
605 | |
606 | if (maxcomp < 1e-32f) { |
607 | rgbe[0] = rgbe[1] = rgbe[2] = rgbe[3] = 0; |
608 | } else { |
609 | float normalize = (float) frexp(maxcomp, &exponent) * 256.0f/maxcomp; |
610 | |
611 | rgbe[0] = (unsigned char)(linear[0] * normalize); |
612 | rgbe[1] = (unsigned char)(linear[1] * normalize); |
613 | rgbe[2] = (unsigned char)(linear[2] * normalize); |
614 | rgbe[3] = (unsigned char)(exponent + 128); |
615 | } |
616 | } |
617 | |
618 | static void stbiw__write_run_data(stbi__write_context *s, int length, unsigned char databyte) |
619 | { |
620 | unsigned char lengthbyte = STBIW_UCHAR(length+128); |
621 | STBIW_ASSERT(length+128 <= 255); |
622 | s->func(s->context, &lengthbyte, 1); |
623 | s->func(s->context, &databyte, 1); |
624 | } |
625 | |
626 | static void stbiw__write_dump_data(stbi__write_context *s, int length, unsigned char *data) |
627 | { |
628 | unsigned char lengthbyte = STBIW_UCHAR(length); |
629 | STBIW_ASSERT(length <= 128); // inconsistent with spec but consistent with official code |
630 | s->func(s->context, &lengthbyte, 1); |
631 | s->func(s->context, data, length); |
632 | } |
633 | |
634 | static void stbiw__write_hdr_scanline(stbi__write_context *s, int width, int ncomp, unsigned char *scratch, float *scanline) |
635 | { |
636 | unsigned char [4] = { 2, 2, 0, 0 }; |
637 | unsigned char rgbe[4]; |
638 | float linear[3]; |
639 | int x; |
640 | |
641 | scanlineheader[2] = (width&0xff00)>>8; |
642 | scanlineheader[3] = (width&0x00ff); |
643 | |
644 | /* skip RLE for images too small or large */ |
645 | if (width < 8 || width >= 32768) { |
646 | for (x=0; x < width; x++) { |
647 | switch (ncomp) { |
648 | case 4: /* fallthrough */ |
649 | case 3: linear[2] = scanline[x*ncomp + 2]; |
650 | linear[1] = scanline[x*ncomp + 1]; |
651 | linear[0] = scanline[x*ncomp + 0]; |
652 | break; |
653 | default: |
654 | linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0]; |
655 | break; |
656 | } |
657 | stbiw__linear_to_rgbe(rgbe, linear); |
658 | s->func(s->context, rgbe, 4); |
659 | } |
660 | } else { |
661 | int c,r; |
662 | /* encode into scratch buffer */ |
663 | for (x=0; x < width; x++) { |
664 | switch(ncomp) { |
665 | case 4: /* fallthrough */ |
666 | case 3: linear[2] = scanline[x*ncomp + 2]; |
667 | linear[1] = scanline[x*ncomp + 1]; |
668 | linear[0] = scanline[x*ncomp + 0]; |
669 | break; |
670 | default: |
671 | linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0]; |
672 | break; |
673 | } |
674 | stbiw__linear_to_rgbe(rgbe, linear); |
675 | scratch[x + width*0] = rgbe[0]; |
676 | scratch[x + width*1] = rgbe[1]; |
677 | scratch[x + width*2] = rgbe[2]; |
678 | scratch[x + width*3] = rgbe[3]; |
679 | } |
680 | |
681 | s->func(s->context, scanlineheader, 4); |
682 | |
683 | /* RLE each component separately */ |
684 | for (c=0; c < 4; c++) { |
685 | unsigned char *comp = &scratch[width*c]; |
686 | |
687 | x = 0; |
688 | while (x < width) { |
689 | // find first run |
690 | r = x; |
691 | while (r+2 < width) { |
692 | if (comp[r] == comp[r+1] && comp[r] == comp[r+2]) |
693 | break; |
694 | ++r; |
695 | } |
696 | if (r+2 >= width) |
697 | r = width; |
698 | // dump up to first run |
699 | while (x < r) { |
700 | int len = r-x; |
701 | if (len > 128) len = 128; |
702 | stbiw__write_dump_data(s, len, &comp[x]); |
703 | x += len; |
704 | } |
705 | // if there's a run, output it |
706 | if (r+2 < width) { // same test as what we break out of in search loop, so only true if we break'd |
707 | // find next byte after run |
708 | while (r < width && comp[r] == comp[x]) |
709 | ++r; |
710 | // output run up to r |
711 | while (x < r) { |
712 | int len = r-x; |
713 | if (len > 127) len = 127; |
714 | stbiw__write_run_data(s, len, comp[x]); |
715 | x += len; |
716 | } |
717 | } |
718 | } |
719 | } |
720 | } |
721 | } |
722 | |
723 | static int stbi_write_hdr_core(stbi__write_context *s, int x, int y, int comp, float *data) |
724 | { |
725 | if (y <= 0 || x <= 0 || data == NULL) |
726 | return 0; |
727 | else { |
728 | // Each component is stored separately. Allocate scratch space for full output scanline. |
729 | unsigned char *scratch = (unsigned char *) STBIW_MALLOC(x*4); |
730 | int i, len; |
731 | char buffer[128]; |
732 | char [] = "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n" ; |
733 | s->func(s->context, header, sizeof(header)-1); |
734 | |
735 | #ifdef __STDC_WANT_SECURE_LIB__ |
736 | len = sprintf_s(buffer, sizeof(buffer), "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n" , y, x); |
737 | #else |
738 | len = sprintf(buffer, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n" , y, x); |
739 | #endif |
740 | s->func(s->context, buffer, len); |
741 | |
742 | for(i=0; i < y; i++) |
743 | stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp*x*(stbi__flip_vertically_on_write ? y-1-i : i)); |
744 | STBIW_FREE(scratch); |
745 | return 1; |
746 | } |
747 | } |
748 | |
749 | STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const float *data) |
750 | { |
751 | stbi__write_context s; |
752 | stbi__start_write_callbacks(&s, func, context); |
753 | return stbi_write_hdr_core(&s, x, y, comp, (float *) data); |
754 | } |
755 | |
756 | #ifndef STBI_WRITE_NO_STDIO |
757 | STBIWDEF int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *data) |
758 | { |
759 | stbi__write_context s; |
760 | if (stbi__start_write_file(&s,filename)) { |
761 | int r = stbi_write_hdr_core(&s, x, y, comp, (float *) data); |
762 | stbi__end_write_file(&s); |
763 | return r; |
764 | } else |
765 | return 0; |
766 | } |
767 | #endif // STBI_WRITE_NO_STDIO |
768 | |
769 | |
770 | ////////////////////////////////////////////////////////////////////////////// |
771 | // |
772 | // PNG writer |
773 | // |
774 | |
775 | #ifndef STBIW_ZLIB_COMPRESS |
776 | // stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size() |
777 | #define stbiw__sbraw(a) ((int *) (void *) (a) - 2) |
778 | #define stbiw__sbm(a) stbiw__sbraw(a)[0] |
779 | #define stbiw__sbn(a) stbiw__sbraw(a)[1] |
780 | |
781 | #define stbiw__sbneedgrow(a,n) ((a)==0 || stbiw__sbn(a)+n >= stbiw__sbm(a)) |
782 | #define stbiw__sbmaybegrow(a,n) (stbiw__sbneedgrow(a,(n)) ? stbiw__sbgrow(a,n) : 0) |
783 | #define stbiw__sbgrow(a,n) stbiw__sbgrowf((void **) &(a), (n), sizeof(*(a))) |
784 | |
785 | #define stbiw__sbpush(a, v) (stbiw__sbmaybegrow(a,1), (a)[stbiw__sbn(a)++] = (v)) |
786 | #define stbiw__sbcount(a) ((a) ? stbiw__sbn(a) : 0) |
787 | #define stbiw__sbfree(a) ((a) ? STBIW_FREE(stbiw__sbraw(a)),0 : 0) |
788 | |
789 | static void *stbiw__sbgrowf(void **arr, int increment, int itemsize) |
790 | { |
791 | int m = *arr ? 2*stbiw__sbm(*arr)+increment : increment+1; |
792 | void *p = STBIW_REALLOC_SIZED(*arr ? stbiw__sbraw(*arr) : 0, *arr ? (stbiw__sbm(*arr)*itemsize + sizeof(int)*2) : 0, itemsize * m + sizeof(int)*2); |
793 | STBIW_ASSERT(p); |
794 | if (p) { |
795 | if (!*arr) ((int *) p)[1] = 0; |
796 | *arr = (void *) ((int *) p + 2); |
797 | stbiw__sbm(*arr) = m; |
798 | } |
799 | return *arr; |
800 | } |
801 | |
802 | static unsigned char *stbiw__zlib_flushf(unsigned char *data, unsigned int *bitbuffer, int *bitcount) |
803 | { |
804 | while (*bitcount >= 8) { |
805 | stbiw__sbpush(data, STBIW_UCHAR(*bitbuffer)); |
806 | *bitbuffer >>= 8; |
807 | *bitcount -= 8; |
808 | } |
809 | return data; |
810 | } |
811 | |
812 | static int stbiw__zlib_bitrev(int code, int codebits) |
813 | { |
814 | int res=0; |
815 | while (codebits--) { |
816 | res = (res << 1) | (code & 1); |
817 | code >>= 1; |
818 | } |
819 | return res; |
820 | } |
821 | |
822 | static unsigned int stbiw__zlib_countm(unsigned char *a, unsigned char *b, int limit) |
823 | { |
824 | int i; |
825 | for (i=0; i < limit && i < 258; ++i) |
826 | if (a[i] != b[i]) break; |
827 | return i; |
828 | } |
829 | |
830 | static unsigned int stbiw__zhash(unsigned char *data) |
831 | { |
832 | stbiw_uint32 hash = data[0] + (data[1] << 8) + (data[2] << 16); |
833 | hash ^= hash << 3; |
834 | hash += hash >> 5; |
835 | hash ^= hash << 4; |
836 | hash += hash >> 17; |
837 | hash ^= hash << 25; |
838 | hash += hash >> 6; |
839 | return hash; |
840 | } |
841 | |
842 | #define stbiw__zlib_flush() (out = stbiw__zlib_flushf(out, &bitbuf, &bitcount)) |
843 | #define stbiw__zlib_add(code,codebits) \ |
844 | (bitbuf |= (code) << bitcount, bitcount += (codebits), stbiw__zlib_flush()) |
845 | #define stbiw__zlib_huffa(b,c) stbiw__zlib_add(stbiw__zlib_bitrev(b,c),c) |
846 | // default huffman tables |
847 | #define stbiw__zlib_huff1(n) stbiw__zlib_huffa(0x30 + (n), 8) |
848 | #define stbiw__zlib_huff2(n) stbiw__zlib_huffa(0x190 + (n)-144, 9) |
849 | #define stbiw__zlib_huff3(n) stbiw__zlib_huffa(0 + (n)-256,7) |
850 | #define stbiw__zlib_huff4(n) stbiw__zlib_huffa(0xc0 + (n)-280,8) |
851 | #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)) |
852 | #define stbiw__zlib_huffb(n) ((n) <= 143 ? stbiw__zlib_huff1(n) : stbiw__zlib_huff2(n)) |
853 | |
854 | #define stbiw__ZHASH 16384 |
855 | |
856 | #endif // STBIW_ZLIB_COMPRESS |
857 | |
858 | STBIWDEF unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality) |
859 | { |
860 | #ifdef STBIW_ZLIB_COMPRESS |
861 | // user provided a zlib compress implementation, use that |
862 | return STBIW_ZLIB_COMPRESS(data, data_len, out_len, quality); |
863 | #else // use builtin |
864 | 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 }; |
865 | 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 }; |
866 | 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 }; |
867 | 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 }; |
868 | unsigned int bitbuf=0; |
869 | int i,j, bitcount=0; |
870 | unsigned char *out = NULL; |
871 | unsigned char ***hash_table = (unsigned char***) STBIW_MALLOC(stbiw__ZHASH * sizeof(unsigned char**)); |
872 | if (hash_table == NULL) |
873 | return NULL; |
874 | if (quality < 5) quality = 5; |
875 | |
876 | stbiw__sbpush(out, 0x78); // DEFLATE 32K window |
877 | stbiw__sbpush(out, 0x5e); // FLEVEL = 1 |
878 | stbiw__zlib_add(1,1); // BFINAL = 1 |
879 | stbiw__zlib_add(1,2); // BTYPE = 1 -- fixed huffman |
880 | |
881 | for (i=0; i < stbiw__ZHASH; ++i) |
882 | hash_table[i] = NULL; |
883 | |
884 | i=0; |
885 | while (i < data_len-3) { |
886 | // hash next 3 bytes of data to be compressed |
887 | int h = stbiw__zhash(data+i)&(stbiw__ZHASH-1), best=3; |
888 | unsigned char *bestloc = 0; |
889 | unsigned char **hlist = hash_table[h]; |
890 | int n = stbiw__sbcount(hlist); |
891 | for (j=0; j < n; ++j) { |
892 | if (hlist[j]-data > i-32768) { // if entry lies within window |
893 | int d = stbiw__zlib_countm(hlist[j], data+i, data_len-i); |
894 | if (d >= best) { best=d; bestloc=hlist[j]; } |
895 | } |
896 | } |
897 | // when hash table entry is too long, delete half the entries |
898 | if (hash_table[h] && stbiw__sbn(hash_table[h]) == 2*quality) { |
899 | STBIW_MEMMOVE(hash_table[h], hash_table[h]+quality, sizeof(hash_table[h][0])*quality); |
900 | stbiw__sbn(hash_table[h]) = quality; |
901 | } |
902 | stbiw__sbpush(hash_table[h],data+i); |
903 | |
904 | if (bestloc) { |
905 | // "lazy matching" - check match at *next* byte, and if it's better, do cur byte as literal |
906 | h = stbiw__zhash(data+i+1)&(stbiw__ZHASH-1); |
907 | hlist = hash_table[h]; |
908 | n = stbiw__sbcount(hlist); |
909 | for (j=0; j < n; ++j) { |
910 | if (hlist[j]-data > i-32767) { |
911 | int e = stbiw__zlib_countm(hlist[j], data+i+1, data_len-i-1); |
912 | if (e > best) { // if next match is better, bail on current match |
913 | bestloc = NULL; |
914 | break; |
915 | } |
916 | } |
917 | } |
918 | } |
919 | |
920 | if (bestloc) { |
921 | int d = (int) (data+i - bestloc); // distance back |
922 | STBIW_ASSERT(d <= 32767 && best <= 258); |
923 | for (j=0; best > lengthc[j+1]-1; ++j); |
924 | stbiw__zlib_huff(j+257); |
925 | if (lengtheb[j]) stbiw__zlib_add(best - lengthc[j], lengtheb[j]); |
926 | for (j=0; d > distc[j+1]-1; ++j); |
927 | stbiw__zlib_add(stbiw__zlib_bitrev(j,5),5); |
928 | if (disteb[j]) stbiw__zlib_add(d - distc[j], disteb[j]); |
929 | i += best; |
930 | } else { |
931 | stbiw__zlib_huffb(data[i]); |
932 | ++i; |
933 | } |
934 | } |
935 | // write out final bytes |
936 | for (;i < data_len; ++i) |
937 | stbiw__zlib_huffb(data[i]); |
938 | stbiw__zlib_huff(256); // end of block |
939 | // pad with 0 bits to byte boundary |
940 | while (bitcount) |
941 | stbiw__zlib_add(0,1); |
942 | |
943 | for (i=0; i < stbiw__ZHASH; ++i) |
944 | (void) stbiw__sbfree(hash_table[i]); |
945 | STBIW_FREE(hash_table); |
946 | |
947 | { |
948 | // compute adler32 on input |
949 | unsigned int s1=1, s2=0; |
950 | int blocklen = (int) (data_len % 5552); |
951 | j=0; |
952 | while (j < data_len) { |
953 | for (i=0; i < blocklen; ++i) { s1 += data[j+i]; s2 += s1; } |
954 | s1 %= 65521; s2 %= 65521; |
955 | j += blocklen; |
956 | blocklen = 5552; |
957 | } |
958 | stbiw__sbpush(out, STBIW_UCHAR(s2 >> 8)); |
959 | stbiw__sbpush(out, STBIW_UCHAR(s2)); |
960 | stbiw__sbpush(out, STBIW_UCHAR(s1 >> 8)); |
961 | stbiw__sbpush(out, STBIW_UCHAR(s1)); |
962 | } |
963 | *out_len = stbiw__sbn(out); |
964 | // make returned pointer freeable |
965 | STBIW_MEMMOVE(stbiw__sbraw(out), out, *out_len); |
966 | return (unsigned char *) stbiw__sbraw(out); |
967 | #endif // STBIW_ZLIB_COMPRESS |
968 | } |
969 | |
970 | static unsigned int stbiw__crc32(unsigned char *buffer, int len) |
971 | { |
972 | #ifdef STBIW_CRC32 |
973 | return STBIW_CRC32(buffer, len); |
974 | #else |
975 | static unsigned int crc_table[256] = |
976 | { |
977 | 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, |
978 | 0x0eDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, |
979 | 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, |
980 | 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, |
981 | 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, |
982 | 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, |
983 | 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, |
984 | 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, |
985 | 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, |
986 | 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, |
987 | 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, |
988 | 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, |
989 | 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, |
990 | 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, |
991 | 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, |
992 | 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, |
993 | 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, |
994 | 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, |
995 | 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, |
996 | 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, |
997 | 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, |
998 | 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, |
999 | 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, |
1000 | 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, |
1001 | 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, |
1002 | 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, |
1003 | 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, |
1004 | 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, |
1005 | 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, |
1006 | 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, |
1007 | 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, |
1008 | 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D |
1009 | }; |
1010 | |
1011 | unsigned int crc = ~0u; |
1012 | int i; |
1013 | for (i=0; i < len; ++i) |
1014 | crc = (crc >> 8) ^ crc_table[buffer[i] ^ (crc & 0xff)]; |
1015 | return ~crc; |
1016 | #endif |
1017 | } |
1018 | |
1019 | #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) |
1020 | #define stbiw__wp32(data,v) stbiw__wpng4(data, (v)>>24,(v)>>16,(v)>>8,(v)); |
1021 | #define stbiw__wptag(data,s) stbiw__wpng4(data, s[0],s[1],s[2],s[3]) |
1022 | |
1023 | static void stbiw__wpcrc(unsigned char **data, int len) |
1024 | { |
1025 | unsigned int crc = stbiw__crc32(*data - len - 4, len+4); |
1026 | stbiw__wp32(*data, crc); |
1027 | } |
1028 | |
1029 | static unsigned char stbiw__paeth(int a, int b, int c) |
1030 | { |
1031 | int p = a + b - c, pa = abs(p-a), pb = abs(p-b), pc = abs(p-c); |
1032 | if (pa <= pb && pa <= pc) return STBIW_UCHAR(a); |
1033 | if (pb <= pc) return STBIW_UCHAR(b); |
1034 | return STBIW_UCHAR(c); |
1035 | } |
1036 | |
1037 | // @OPTIMIZE: provide an option that always forces left-predict or paeth predict |
1038 | 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) |
1039 | { |
1040 | static int mapping[] = { 0,1,2,3,4 }; |
1041 | static int firstmap[] = { 0,1,0,5,6 }; |
1042 | int *mymap = (y != 0) ? mapping : firstmap; |
1043 | int i; |
1044 | int type = mymap[filter_type]; |
1045 | unsigned char *z = pixels + stride_bytes * (stbi__flip_vertically_on_write ? height-1-y : y); |
1046 | int signed_stride = stbi__flip_vertically_on_write ? -stride_bytes : stride_bytes; |
1047 | |
1048 | if (type==0) { |
1049 | memcpy(line_buffer, z, width*n); |
1050 | return; |
1051 | } |
1052 | |
1053 | // first loop isn't optimized since it's just one pixel |
1054 | for (i = 0; i < n; ++i) { |
1055 | switch (type) { |
1056 | case 1: line_buffer[i] = z[i]; break; |
1057 | case 2: line_buffer[i] = z[i] - z[i-signed_stride]; break; |
1058 | case 3: line_buffer[i] = z[i] - (z[i-signed_stride]>>1); break; |
1059 | case 4: line_buffer[i] = (signed char) (z[i] - stbiw__paeth(0,z[i-signed_stride],0)); break; |
1060 | case 5: line_buffer[i] = z[i]; break; |
1061 | case 6: line_buffer[i] = z[i]; break; |
1062 | } |
1063 | } |
1064 | switch (type) { |
1065 | case 1: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - z[i-n]; break; |
1066 | case 2: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - z[i-signed_stride]; break; |
1067 | case 3: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - ((z[i-n] + z[i-signed_stride])>>1); break; |
1068 | 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; |
1069 | case 5: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - (z[i-n]>>1); break; |
1070 | case 6: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - stbiw__paeth(z[i-n], 0,0); break; |
1071 | } |
1072 | } |
1073 | |
1074 | STBIWDEF unsigned char *stbi_write_png_to_mem(const unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len) |
1075 | { |
1076 | int force_filter = stbi_write_force_png_filter; |
1077 | int ctype[5] = { -1, 0, 4, 2, 6 }; |
1078 | unsigned char sig[8] = { 137,80,78,71,13,10,26,10 }; |
1079 | unsigned char *out,*o, *filt, *zlib; |
1080 | signed char *line_buffer; |
1081 | int j,zlen; |
1082 | |
1083 | if (stride_bytes == 0) |
1084 | stride_bytes = x * n; |
1085 | |
1086 | if (force_filter >= 5) { |
1087 | force_filter = -1; |
1088 | } |
1089 | |
1090 | filt = (unsigned char *) STBIW_MALLOC((x*n+1) * y); if (!filt) return 0; |
1091 | line_buffer = (signed char *) STBIW_MALLOC(x * n); if (!line_buffer) { STBIW_FREE(filt); return 0; } |
1092 | for (j=0; j < y; ++j) { |
1093 | int filter_type; |
1094 | if (force_filter > -1) { |
1095 | filter_type = force_filter; |
1096 | stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, force_filter, line_buffer); |
1097 | } else { // Estimate the best filter by running through all of them: |
1098 | int best_filter = 0, best_filter_val = 0x7fffffff, est, i; |
1099 | for (filter_type = 0; filter_type < 5; filter_type++) { |
1100 | stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, filter_type, line_buffer); |
1101 | |
1102 | // Estimate the entropy of the line using this filter; the less, the better. |
1103 | est = 0; |
1104 | for (i = 0; i < x*n; ++i) { |
1105 | est += abs((signed char) line_buffer[i]); |
1106 | } |
1107 | if (est < best_filter_val) { |
1108 | best_filter_val = est; |
1109 | best_filter = filter_type; |
1110 | } |
1111 | } |
1112 | if (filter_type != best_filter) { // If the last iteration already got us the best filter, don't redo it |
1113 | stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, best_filter, line_buffer); |
1114 | filter_type = best_filter; |
1115 | } |
1116 | } |
1117 | // when we get here, filter_type contains the filter type, and line_buffer contains the data |
1118 | filt[j*(x*n+1)] = (unsigned char) filter_type; |
1119 | STBIW_MEMMOVE(filt+j*(x*n+1)+1, line_buffer, x*n); |
1120 | } |
1121 | STBIW_FREE(line_buffer); |
1122 | zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, stbi_write_png_compression_level); |
1123 | STBIW_FREE(filt); |
1124 | if (!zlib) return 0; |
1125 | |
1126 | // each tag requires 12 bytes of overhead |
1127 | out = (unsigned char *) STBIW_MALLOC(8 + 12+13 + 12+zlen + 12); |
1128 | if (!out) return 0; |
1129 | *out_len = 8 + 12+13 + 12+zlen + 12; |
1130 | |
1131 | o=out; |
1132 | STBIW_MEMMOVE(o,sig,8); o+= 8; |
1133 | stbiw__wp32(o, 13); // header length |
1134 | stbiw__wptag(o, "IHDR" ); |
1135 | stbiw__wp32(o, x); |
1136 | stbiw__wp32(o, y); |
1137 | *o++ = 8; |
1138 | *o++ = STBIW_UCHAR(ctype[n]); |
1139 | *o++ = 0; |
1140 | *o++ = 0; |
1141 | *o++ = 0; |
1142 | stbiw__wpcrc(&o,13); |
1143 | |
1144 | stbiw__wp32(o, zlen); |
1145 | stbiw__wptag(o, "IDAT" ); |
1146 | STBIW_MEMMOVE(o, zlib, zlen); |
1147 | o += zlen; |
1148 | STBIW_FREE(zlib); |
1149 | stbiw__wpcrc(&o, zlen); |
1150 | |
1151 | stbiw__wp32(o,0); |
1152 | stbiw__wptag(o, "IEND" ); |
1153 | stbiw__wpcrc(&o,0); |
1154 | |
1155 | STBIW_ASSERT(o == out + *out_len); |
1156 | |
1157 | return out; |
1158 | } |
1159 | |
1160 | #ifndef STBI_WRITE_NO_STDIO |
1161 | STBIWDEF int stbi_write_png(char const *filename, int x, int y, int comp, const void *data, int stride_bytes) |
1162 | { |
1163 | FILE *f; |
1164 | int len; |
1165 | unsigned char *png = stbi_write_png_to_mem((const unsigned char *) data, stride_bytes, x, y, comp, &len); |
1166 | if (png == NULL) return 0; |
1167 | |
1168 | f = stbiw__fopen(filename, "wb" ); |
1169 | if (!f) { STBIW_FREE(png); return 0; } |
1170 | fwrite(png, 1, len, f); |
1171 | fclose(f); |
1172 | STBIW_FREE(png); |
1173 | return 1; |
1174 | } |
1175 | #endif |
1176 | |
1177 | 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) |
1178 | { |
1179 | int len; |
1180 | unsigned char *png = stbi_write_png_to_mem((const unsigned char *) data, stride_bytes, x, y, comp, &len); |
1181 | if (png == NULL) return 0; |
1182 | func(context, png, len); |
1183 | STBIW_FREE(png); |
1184 | return 1; |
1185 | } |
1186 | |
1187 | |
1188 | /* *************************************************************************** |
1189 | * |
1190 | * JPEG writer |
1191 | * |
1192 | * This is based on Jon Olick's jo_jpeg.cpp: |
1193 | * public domain Simple, Minimalistic JPEG writer - http://www.jonolick.com/code.html |
1194 | */ |
1195 | |
1196 | 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, |
1197 | 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 }; |
1198 | |
1199 | static void stbiw__jpg_writeBits(stbi__write_context *s, int *bitBufP, int *bitCntP, const unsigned short *bs) { |
1200 | int bitBuf = *bitBufP, bitCnt = *bitCntP; |
1201 | bitCnt += bs[1]; |
1202 | bitBuf |= bs[0] << (24 - bitCnt); |
1203 | while(bitCnt >= 8) { |
1204 | unsigned char c = (bitBuf >> 16) & 255; |
1205 | stbiw__putc(s, c); |
1206 | if(c == 255) { |
1207 | stbiw__putc(s, 0); |
1208 | } |
1209 | bitBuf <<= 8; |
1210 | bitCnt -= 8; |
1211 | } |
1212 | *bitBufP = bitBuf; |
1213 | *bitCntP = bitCnt; |
1214 | } |
1215 | |
1216 | static void stbiw__jpg_DCT(float *d0p, float *d1p, float *d2p, float *d3p, float *d4p, float *d5p, float *d6p, float *d7p) { |
1217 | float d0 = *d0p, d1 = *d1p, d2 = *d2p, d3 = *d3p, d4 = *d4p, d5 = *d5p, d6 = *d6p, d7 = *d7p; |
1218 | float z1, z2, z3, z4, z5, z11, z13; |
1219 | |
1220 | float tmp0 = d0 + d7; |
1221 | float tmp7 = d0 - d7; |
1222 | float tmp1 = d1 + d6; |
1223 | float tmp6 = d1 - d6; |
1224 | float tmp2 = d2 + d5; |
1225 | float tmp5 = d2 - d5; |
1226 | float tmp3 = d3 + d4; |
1227 | float tmp4 = d3 - d4; |
1228 | |
1229 | // Even part |
1230 | float tmp10 = tmp0 + tmp3; // phase 2 |
1231 | float tmp13 = tmp0 - tmp3; |
1232 | float tmp11 = tmp1 + tmp2; |
1233 | float tmp12 = tmp1 - tmp2; |
1234 | |
1235 | d0 = tmp10 + tmp11; // phase 3 |
1236 | d4 = tmp10 - tmp11; |
1237 | |
1238 | z1 = (tmp12 + tmp13) * 0.707106781f; // c4 |
1239 | d2 = tmp13 + z1; // phase 5 |
1240 | d6 = tmp13 - z1; |
1241 | |
1242 | // Odd part |
1243 | tmp10 = tmp4 + tmp5; // phase 2 |
1244 | tmp11 = tmp5 + tmp6; |
1245 | tmp12 = tmp6 + tmp7; |
1246 | |
1247 | // The rotator is modified from fig 4-8 to avoid extra negations. |
1248 | z5 = (tmp10 - tmp12) * 0.382683433f; // c6 |
1249 | z2 = tmp10 * 0.541196100f + z5; // c2-c6 |
1250 | z4 = tmp12 * 1.306562965f + z5; // c2+c6 |
1251 | z3 = tmp11 * 0.707106781f; // c4 |
1252 | |
1253 | z11 = tmp7 + z3; // phase 5 |
1254 | z13 = tmp7 - z3; |
1255 | |
1256 | *d5p = z13 + z2; // phase 6 |
1257 | *d3p = z13 - z2; |
1258 | *d1p = z11 + z4; |
1259 | *d7p = z11 - z4; |
1260 | |
1261 | *d0p = d0; *d2p = d2; *d4p = d4; *d6p = d6; |
1262 | } |
1263 | |
1264 | static void stbiw__jpg_calcBits(int val, unsigned short bits[2]) { |
1265 | int tmp1 = val < 0 ? -val : val; |
1266 | val = val < 0 ? val-1 : val; |
1267 | bits[1] = 1; |
1268 | while(tmp1 >>= 1) { |
1269 | ++bits[1]; |
1270 | } |
1271 | bits[0] = val & ((1<<bits[1])-1); |
1272 | } |
1273 | |
1274 | 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]) { |
1275 | const unsigned short EOB[2] = { HTAC[0x00][0], HTAC[0x00][1] }; |
1276 | const unsigned short M16zeroes[2] = { HTAC[0xF0][0], HTAC[0xF0][1] }; |
1277 | int dataOff, i, j, n, diff, end0pos, x, y; |
1278 | int DU[64]; |
1279 | |
1280 | // DCT rows |
1281 | for(dataOff=0, n=du_stride*8; dataOff<n; dataOff+=du_stride) { |
1282 | 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]); |
1283 | } |
1284 | // DCT columns |
1285 | for(dataOff=0; dataOff<8; ++dataOff) { |
1286 | stbiw__jpg_DCT(&CDU[dataOff], &CDU[dataOff+du_stride], &CDU[dataOff+du_stride*2], &CDU[dataOff+du_stride*3], &CDU[dataOff+du_stride*4], |
1287 | &CDU[dataOff+du_stride*5], &CDU[dataOff+du_stride*6], &CDU[dataOff+du_stride*7]); |
1288 | } |
1289 | // Quantize/descale/zigzag the coefficients |
1290 | for(y = 0, j=0; y < 8; ++y) { |
1291 | for(x = 0; x < 8; ++x,++j) { |
1292 | float v; |
1293 | i = y*du_stride+x; |
1294 | v = CDU[i]*fdtbl[j]; |
1295 | // DU[stbiw__jpg_ZigZag[j]] = (int)(v < 0 ? ceilf(v - 0.5f) : floorf(v + 0.5f)); |
1296 | // ceilf() and floorf() are C99, not C89, but I /think/ they're not needed here anyway? |
1297 | DU[stbiw__jpg_ZigZag[j]] = (int)(v < 0 ? v - 0.5f : v + 0.5f); |
1298 | } |
1299 | } |
1300 | |
1301 | // Encode DC |
1302 | diff = DU[0] - DC; |
1303 | if (diff == 0) { |
1304 | stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTDC[0]); |
1305 | } else { |
1306 | unsigned short bits[2]; |
1307 | stbiw__jpg_calcBits(diff, bits); |
1308 | stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTDC[bits[1]]); |
1309 | stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits); |
1310 | } |
1311 | // Encode ACs |
1312 | end0pos = 63; |
1313 | for(; (end0pos>0)&&(DU[end0pos]==0); --end0pos) { |
1314 | } |
1315 | // end0pos = first element in reverse order !=0 |
1316 | if(end0pos == 0) { |
1317 | stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB); |
1318 | return DU[0]; |
1319 | } |
1320 | for(i = 1; i <= end0pos; ++i) { |
1321 | int startpos = i; |
1322 | int nrzeroes; |
1323 | unsigned short bits[2]; |
1324 | for (; DU[i]==0 && i<=end0pos; ++i) { |
1325 | } |
1326 | nrzeroes = i-startpos; |
1327 | if ( nrzeroes >= 16 ) { |
1328 | int lng = nrzeroes>>4; |
1329 | int nrmarker; |
1330 | for (nrmarker=1; nrmarker <= lng; ++nrmarker) |
1331 | stbiw__jpg_writeBits(s, bitBuf, bitCnt, M16zeroes); |
1332 | nrzeroes &= 15; |
1333 | } |
1334 | stbiw__jpg_calcBits(DU[i], bits); |
1335 | stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTAC[(nrzeroes<<4)+bits[1]]); |
1336 | stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits); |
1337 | } |
1338 | if(end0pos != 63) { |
1339 | stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB); |
1340 | } |
1341 | return DU[0]; |
1342 | } |
1343 | |
1344 | static int stbi_write_jpg_core(stbi__write_context *s, int width, int height, int comp, const void* data, int quality) { |
1345 | // Constants that don't pollute global namespace |
1346 | 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}; |
1347 | static const unsigned char std_dc_luminance_values[] = {0,1,2,3,4,5,6,7,8,9,10,11}; |
1348 | 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}; |
1349 | static const unsigned char std_ac_luminance_values[] = { |
1350 | 0x01,0x02,0x03,0x00,0x04,0x11,0x05,0x12,0x21,0x31,0x41,0x06,0x13,0x51,0x61,0x07,0x22,0x71,0x14,0x32,0x81,0x91,0xa1,0x08, |
1351 | 0x23,0x42,0xb1,0xc1,0x15,0x52,0xd1,0xf0,0x24,0x33,0x62,0x72,0x82,0x09,0x0a,0x16,0x17,0x18,0x19,0x1a,0x25,0x26,0x27,0x28, |
1352 | 0x29,0x2a,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x53,0x54,0x55,0x56,0x57,0x58,0x59, |
1353 | 0x5a,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x83,0x84,0x85,0x86,0x87,0x88,0x89, |
1354 | 0x8a,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xb2,0xb3,0xb4,0xb5,0xb6, |
1355 | 0xb7,0xb8,0xb9,0xba,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,0xe1,0xe2, |
1356 | 0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa |
1357 | }; |
1358 | 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}; |
1359 | static const unsigned char std_dc_chrominance_values[] = {0,1,2,3,4,5,6,7,8,9,10,11}; |
1360 | 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}; |
1361 | static const unsigned char std_ac_chrominance_values[] = { |
1362 | 0x00,0x01,0x02,0x03,0x11,0x04,0x05,0x21,0x31,0x06,0x12,0x41,0x51,0x07,0x61,0x71,0x13,0x22,0x32,0x81,0x08,0x14,0x42,0x91, |
1363 | 0xa1,0xb1,0xc1,0x09,0x23,0x33,0x52,0xf0,0x15,0x62,0x72,0xd1,0x0a,0x16,0x24,0x34,0xe1,0x25,0xf1,0x17,0x18,0x19,0x1a,0x26, |
1364 | 0x27,0x28,0x29,0x2a,0x35,0x36,0x37,0x38,0x39,0x3a,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x53,0x54,0x55,0x56,0x57,0x58, |
1365 | 0x59,0x5a,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x82,0x83,0x84,0x85,0x86,0x87, |
1366 | 0x88,0x89,0x8a,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xb2,0xb3,0xb4, |
1367 | 0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda, |
1368 | 0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa |
1369 | }; |
1370 | // Huffman tables |
1371 | 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}}; |
1372 | 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}}; |
1373 | static const unsigned short YAC_HT[256][2] = { |
1374 | {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}, |
1375 | {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}, |
1376 | {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}, |
1377 | {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}, |
1378 | {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}, |
1379 | {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}, |
1380 | {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}, |
1381 | {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}, |
1382 | {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}, |
1383 | {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}, |
1384 | {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}, |
1385 | {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}, |
1386 | {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}, |
1387 | {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}, |
1388 | {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}, |
1389 | {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} |
1390 | }; |
1391 | static const unsigned short UVAC_HT[256][2] = { |
1392 | {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}, |
1393 | {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}, |
1394 | {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}, |
1395 | {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}, |
1396 | {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}, |
1397 | {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}, |
1398 | {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}, |
1399 | {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}, |
1400 | {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}, |
1401 | {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}, |
1402 | {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}, |
1403 | {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}, |
1404 | {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}, |
1405 | {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}, |
1406 | {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}, |
1407 | {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} |
1408 | }; |
1409 | 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, |
1410 | 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}; |
1411 | 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, |
1412 | 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}; |
1413 | static const float aasf[] = { 1.0f * 2.828427125f, 1.387039845f * 2.828427125f, 1.306562965f * 2.828427125f, 1.175875602f * 2.828427125f, |
1414 | 1.0f * 2.828427125f, 0.785694958f * 2.828427125f, 0.541196100f * 2.828427125f, 0.275899379f * 2.828427125f }; |
1415 | |
1416 | int row, col, i, k, subsample; |
1417 | float fdtbl_Y[64], fdtbl_UV[64]; |
1418 | unsigned char YTable[64], UVTable[64]; |
1419 | |
1420 | if(!data || !width || !height || comp > 4 || comp < 1) { |
1421 | return 0; |
1422 | } |
1423 | |
1424 | quality = quality ? quality : 90; |
1425 | subsample = quality <= 90 ? 1 : 0; |
1426 | quality = quality < 1 ? 1 : quality > 100 ? 100 : quality; |
1427 | quality = quality < 50 ? 5000 / quality : 200 - quality * 2; |
1428 | |
1429 | for(i = 0; i < 64; ++i) { |
1430 | int uvti, yti = (YQT[i]*quality+50)/100; |
1431 | YTable[stbiw__jpg_ZigZag[i]] = (unsigned char) (yti < 1 ? 1 : yti > 255 ? 255 : yti); |
1432 | uvti = (UVQT[i]*quality+50)/100; |
1433 | UVTable[stbiw__jpg_ZigZag[i]] = (unsigned char) (uvti < 1 ? 1 : uvti > 255 ? 255 : uvti); |
1434 | } |
1435 | |
1436 | for(row = 0, k = 0; row < 8; ++row) { |
1437 | for(col = 0; col < 8; ++col, ++k) { |
1438 | fdtbl_Y[k] = 1 / (YTable [stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]); |
1439 | fdtbl_UV[k] = 1 / (UVTable[stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]); |
1440 | } |
1441 | } |
1442 | |
1443 | // Write Headers |
1444 | { |
1445 | 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 }; |
1446 | static const unsigned char head2[] = { 0xFF,0xDA,0,0xC,3,1,0,2,0x11,3,0x11,0,0x3F,0 }; |
1447 | const unsigned char head1[] = { 0xFF,0xC0,0,0x11,8,(unsigned char)(height>>8),STBIW_UCHAR(height),(unsigned char)(width>>8),STBIW_UCHAR(width), |
1448 | 3,1,(unsigned char)(subsample?0x22:0x11),0,2,0x11,1,3,0x11,1,0xFF,0xC4,0x01,0xA2,0 }; |
1449 | s->func(s->context, (void*)head0, sizeof(head0)); |
1450 | s->func(s->context, (void*)YTable, sizeof(YTable)); |
1451 | stbiw__putc(s, 1); |
1452 | s->func(s->context, UVTable, sizeof(UVTable)); |
1453 | s->func(s->context, (void*)head1, sizeof(head1)); |
1454 | s->func(s->context, (void*)(std_dc_luminance_nrcodes+1), sizeof(std_dc_luminance_nrcodes)-1); |
1455 | s->func(s->context, (void*)std_dc_luminance_values, sizeof(std_dc_luminance_values)); |
1456 | stbiw__putc(s, 0x10); // HTYACinfo |
1457 | s->func(s->context, (void*)(std_ac_luminance_nrcodes+1), sizeof(std_ac_luminance_nrcodes)-1); |
1458 | s->func(s->context, (void*)std_ac_luminance_values, sizeof(std_ac_luminance_values)); |
1459 | stbiw__putc(s, 1); // HTUDCinfo |
1460 | s->func(s->context, (void*)(std_dc_chrominance_nrcodes+1), sizeof(std_dc_chrominance_nrcodes)-1); |
1461 | s->func(s->context, (void*)std_dc_chrominance_values, sizeof(std_dc_chrominance_values)); |
1462 | stbiw__putc(s, 0x11); // HTUACinfo |
1463 | s->func(s->context, (void*)(std_ac_chrominance_nrcodes+1), sizeof(std_ac_chrominance_nrcodes)-1); |
1464 | s->func(s->context, (void*)std_ac_chrominance_values, sizeof(std_ac_chrominance_values)); |
1465 | s->func(s->context, (void*)head2, sizeof(head2)); |
1466 | } |
1467 | |
1468 | // Encode 8x8 macroblocks |
1469 | { |
1470 | static const unsigned short fillBits[] = {0x7F, 7}; |
1471 | int DCY=0, DCU=0, DCV=0; |
1472 | int bitBuf=0, bitCnt=0; |
1473 | // comp == 2 is grey+alpha (alpha is ignored) |
1474 | int ofsG = comp > 2 ? 1 : 0, ofsB = comp > 2 ? 2 : 0; |
1475 | const unsigned char *dataR = (const unsigned char *)data; |
1476 | const unsigned char *dataG = dataR + ofsG; |
1477 | const unsigned char *dataB = dataR + ofsB; |
1478 | int x, y, pos; |
1479 | if(subsample) { |
1480 | for(y = 0; y < height; y += 16) { |
1481 | for(x = 0; x < width; x += 16) { |
1482 | float Y[256], U[256], V[256]; |
1483 | for(row = y, pos = 0; row < y+16; ++row) { |
1484 | // row >= height => use last input row |
1485 | int clamped_row = (row < height) ? row : height - 1; |
1486 | int base_p = (stbi__flip_vertically_on_write ? (height-1-clamped_row) : clamped_row)*width*comp; |
1487 | for(col = x; col < x+16; ++col, ++pos) { |
1488 | // if col >= width => use pixel from last input column |
1489 | int p = base_p + ((col < width) ? col : (width-1))*comp; |
1490 | float r = dataR[p], g = dataG[p], b = dataB[p]; |
1491 | Y[pos]= +0.29900f*r + 0.58700f*g + 0.11400f*b - 128; |
1492 | U[pos]= -0.16874f*r - 0.33126f*g + 0.50000f*b; |
1493 | V[pos]= +0.50000f*r - 0.41869f*g - 0.08131f*b; |
1494 | } |
1495 | } |
1496 | DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+0, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT); |
1497 | DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+8, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT); |
1498 | DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+128, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT); |
1499 | DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+136, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT); |
1500 | |
1501 | // subsample U,V |
1502 | { |
1503 | float subU[64], subV[64]; |
1504 | int yy, xx; |
1505 | for(yy = 0, pos = 0; yy < 8; ++yy) { |
1506 | for(xx = 0; xx < 8; ++xx, ++pos) { |
1507 | int j = yy*32+xx*2; |
1508 | subU[pos] = (U[j+0] + U[j+1] + U[j+16] + U[j+17]) * 0.25f; |
1509 | subV[pos] = (V[j+0] + V[j+1] + V[j+16] + V[j+17]) * 0.25f; |
1510 | } |
1511 | } |
1512 | DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, subU, 8, fdtbl_UV, DCU, UVDC_HT, UVAC_HT); |
1513 | DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, subV, 8, fdtbl_UV, DCV, UVDC_HT, UVAC_HT); |
1514 | } |
1515 | } |
1516 | } |
1517 | } else { |
1518 | for(y = 0; y < height; y += 8) { |
1519 | for(x = 0; x < width; x += 8) { |
1520 | float Y[64], U[64], V[64]; |
1521 | for(row = y, pos = 0; row < y+8; ++row) { |
1522 | // row >= height => use last input row |
1523 | int clamped_row = (row < height) ? row : height - 1; |
1524 | int base_p = (stbi__flip_vertically_on_write ? (height-1-clamped_row) : clamped_row)*width*comp; |
1525 | for(col = x; col < x+8; ++col, ++pos) { |
1526 | // if col >= width => use pixel from last input column |
1527 | int p = base_p + ((col < width) ? col : (width-1))*comp; |
1528 | float r = dataR[p], g = dataG[p], b = dataB[p]; |
1529 | Y[pos]= +0.29900f*r + 0.58700f*g + 0.11400f*b - 128; |
1530 | U[pos]= -0.16874f*r - 0.33126f*g + 0.50000f*b; |
1531 | V[pos]= +0.50000f*r - 0.41869f*g - 0.08131f*b; |
1532 | } |
1533 | } |
1534 | |
1535 | DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y, 8, fdtbl_Y, DCY, YDC_HT, YAC_HT); |
1536 | DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, U, 8, fdtbl_UV, DCU, UVDC_HT, UVAC_HT); |
1537 | DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, V, 8, fdtbl_UV, DCV, UVDC_HT, UVAC_HT); |
1538 | } |
1539 | } |
1540 | } |
1541 | |
1542 | // Do the bit alignment of the EOI marker |
1543 | stbiw__jpg_writeBits(s, &bitBuf, &bitCnt, fillBits); |
1544 | } |
1545 | |
1546 | // EOI |
1547 | stbiw__putc(s, 0xFF); |
1548 | stbiw__putc(s, 0xD9); |
1549 | |
1550 | return 1; |
1551 | } |
1552 | |
1553 | STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality) |
1554 | { |
1555 | stbi__write_context s; |
1556 | stbi__start_write_callbacks(&s, func, context); |
1557 | return stbi_write_jpg_core(&s, x, y, comp, (void *) data, quality); |
1558 | } |
1559 | |
1560 | |
1561 | #ifndef STBI_WRITE_NO_STDIO |
1562 | STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const void *data, int quality) |
1563 | { |
1564 | stbi__write_context s; |
1565 | if (stbi__start_write_file(&s,filename)) { |
1566 | int r = stbi_write_jpg_core(&s, x, y, comp, data, quality); |
1567 | stbi__end_write_file(&s); |
1568 | return r; |
1569 | } else |
1570 | return 0; |
1571 | } |
1572 | #endif |
1573 | |
1574 | #endif // STB_IMAGE_WRITE_IMPLEMENTATION |
1575 | |
1576 | /* Revision history |
1577 | 1.14 (2020-02-02) updated JPEG writer to downsample chroma channels |
1578 | 1.13 |
1579 | 1.12 |
1580 | 1.11 (2019-08-11) |
1581 | |
1582 | 1.10 (2019-02-07) |
1583 | support utf8 filenames in Windows; fix warnings and platform ifdefs |
1584 | 1.09 (2018-02-11) |
1585 | fix typo in zlib quality API, improve STB_I_W_STATIC in C++ |
1586 | 1.08 (2018-01-29) |
1587 | add stbi__flip_vertically_on_write, external zlib, zlib quality, choose PNG filter |
1588 | 1.07 (2017-07-24) |
1589 | doc fix |
1590 | 1.06 (2017-07-23) |
1591 | writing JPEG (using Jon Olick's code) |
1592 | 1.05 ??? |
1593 | 1.04 (2017-03-03) |
1594 | monochrome BMP expansion |
1595 | 1.03 ??? |
1596 | 1.02 (2016-04-02) |
1597 | avoid allocating large structures on the stack |
1598 | 1.01 (2016-01-16) |
1599 | STBIW_REALLOC_SIZED: support allocators with no realloc support |
1600 | avoid race-condition in crc initialization |
1601 | minor compile issues |
1602 | 1.00 (2015-09-14) |
1603 | installable file IO function |
1604 | 0.99 (2015-09-13) |
1605 | warning fixes; TGA rle support |
1606 | 0.98 (2015-04-08) |
1607 | added STBIW_MALLOC, STBIW_ASSERT etc |
1608 | 0.97 (2015-01-18) |
1609 | fixed HDR asserts, rewrote HDR rle logic |
1610 | 0.96 (2015-01-17) |
1611 | add HDR output |
1612 | fix monochrome BMP |
1613 | 0.95 (2014-08-17) |
1614 | add monochrome TGA output |
1615 | 0.94 (2014-05-31) |
1616 | rename private functions to avoid conflicts with stb_image.h |
1617 | 0.93 (2014-05-27) |
1618 | warning fixes |
1619 | 0.92 (2010-08-01) |
1620 | casts to unsigned char to fix warnings |
1621 | 0.91 (2010-07-17) |
1622 | first public release |
1623 | 0.90 first internal release |
1624 | */ |
1625 | |
1626 | /* |
1627 | ------------------------------------------------------------------------------ |
1628 | This software is available under 2 licenses -- choose whichever you prefer. |
1629 | ------------------------------------------------------------------------------ |
1630 | ALTERNATIVE A - MIT License |
1631 | Copyright (c) 2017 Sean Barrett |
1632 | Permission is hereby granted, free of charge, to any person obtaining a copy of |
1633 | this software and associated documentation files (the "Software"), to deal in |
1634 | the Software without restriction, including without limitation the rights to |
1635 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies |
1636 | of the Software, and to permit persons to whom the Software is furnished to do |
1637 | so, subject to the following conditions: |
1638 | The above copyright notice and this permission notice shall be included in all |
1639 | copies or substantial portions of the Software. |
1640 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
1641 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
1642 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
1643 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
1644 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
1645 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
1646 | SOFTWARE. |
1647 | ------------------------------------------------------------------------------ |
1648 | ALTERNATIVE B - Public Domain (www.unlicense.org) |
1649 | This is free and unencumbered software released into the public domain. |
1650 | Anyone is free to copy, modify, publish, use, compile, sell, or distribute this |
1651 | software, either in source code form or as a compiled binary, for any purpose, |
1652 | commercial or non-commercial, and by any means. |
1653 | In jurisdictions that recognize copyright laws, the author or authors of this |
1654 | software dedicate any and all copyright interest in the software to the public |
1655 | domain. We make this dedication for the benefit of the public at large and to |
1656 | the detriment of our heirs and successors. We intend this dedication to be an |
1657 | overt act of relinquishment in perpetuity of all present and future rights to |
1658 | this software under copyright law. |
1659 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
1660 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
1661 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
1662 | AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
1663 | ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
1664 | WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
1665 | ------------------------------------------------------------------------------ |
1666 | */ |
1667 | |