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1 | |
2 | /* pngrtran.c - transforms the data in a row for PNG readers | |
3 | * | |
a626cc03 | 4 | * libpng 1.0.3 - January 14, 1999 |
c801d85f KB |
5 | * For conditions of distribution and use, see copyright notice in png.h |
6 | * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. | |
7 | * Copyright (c) 1996, 1997 Andreas Dilger | |
a626cc03 | 8 | * Copyright (c) 1998, 1999 Glenn Randers-Pehrson |
c801d85f | 9 | * |
a626cc03 | 10 | * This file contains functions optionally called by an application |
c801d85f | 11 | * in order to tell libpng how to handle data when reading a PNG. |
a626cc03 | 12 | * Transformations that are used in both reading and writing are |
c801d85f KB |
13 | * in pngtrans.c. |
14 | */ | |
15 | ||
16 | #define PNG_INTERNAL | |
a626cc03 | 17 | #include "png.h" |
c801d85f | 18 | |
197dd9af PA |
19 | #if defined(_MSC_VER) && !defined(__MWERKS__) |
20 | #define __VISUALC__ _MSC_VER | |
21 | #endif | |
22 | #ifdef __VISUALC__ | |
23 | #ifndef WIN32 | |
24 | #pragma warning(disable:4135) | |
25 | #endif | |
26 | #endif | |
27 | ||
c801d85f KB |
28 | /* Set the action on getting a CRC error for an ancillary or critical chunk. */ |
29 | void | |
30 | png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action) | |
31 | { | |
32 | png_debug(1, "in png_set_crc_action\n"); | |
33 | /* Tell libpng how we react to CRC errors in critical chunks */ | |
34 | switch (crit_action) | |
35 | { | |
36 | case PNG_CRC_NO_CHANGE: /* leave setting as is */ | |
37 | break; | |
38 | case PNG_CRC_WARN_USE: /* warn/use data */ | |
39 | png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK; | |
40 | png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE; | |
41 | break; | |
42 | case PNG_CRC_QUIET_USE: /* quiet/use data */ | |
43 | png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK; | |
44 | png_ptr->flags |= PNG_FLAG_CRC_CRITICAL_USE | | |
45 | PNG_FLAG_CRC_CRITICAL_IGNORE; | |
46 | break; | |
47 | case PNG_CRC_WARN_DISCARD: /* not a valid action for critical data */ | |
48 | png_warning(png_ptr, "Can't discard critical data on CRC error."); | |
49 | case PNG_CRC_ERROR_QUIT: /* error/quit */ | |
50 | case PNG_CRC_DEFAULT: | |
51 | default: | |
52 | png_ptr->flags &= ~PNG_FLAG_CRC_CRITICAL_MASK; | |
53 | break; | |
54 | } | |
55 | ||
56 | switch (ancil_action) | |
57 | { | |
58 | case PNG_CRC_NO_CHANGE: /* leave setting as is */ | |
59 | break; | |
60 | case PNG_CRC_WARN_USE: /* warn/use data */ | |
61 | png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK; | |
62 | png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE; | |
63 | break; | |
64 | case PNG_CRC_QUIET_USE: /* quiet/use data */ | |
65 | png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK; | |
66 | png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_USE | | |
67 | PNG_FLAG_CRC_ANCILLARY_NOWARN; | |
68 | break; | |
69 | case PNG_CRC_ERROR_QUIT: /* error/quit */ | |
70 | png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK; | |
71 | png_ptr->flags |= PNG_FLAG_CRC_ANCILLARY_NOWARN; | |
72 | break; | |
73 | case PNG_CRC_WARN_DISCARD: /* warn/discard data */ | |
74 | case PNG_CRC_DEFAULT: | |
75 | default: | |
76 | png_ptr->flags &= ~PNG_FLAG_CRC_ANCILLARY_MASK; | |
77 | break; | |
78 | } | |
79 | } | |
80 | ||
81 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) | |
82 | /* handle alpha and tRNS via a background color */ | |
83 | void | |
84 | png_set_background(png_structp png_ptr, | |
85 | png_color_16p background_color, int background_gamma_code, | |
86 | int need_expand, double background_gamma) | |
87 | { | |
88 | png_debug(1, "in png_set_background\n"); | |
89 | if (background_gamma_code == PNG_BACKGROUND_GAMMA_UNKNOWN) | |
90 | { | |
91 | png_warning(png_ptr, "Application must supply a known background gamma"); | |
92 | return; | |
93 | } | |
94 | ||
95 | png_ptr->transformations |= PNG_BACKGROUND; | |
a626cc03 | 96 | png_memcpy(&(png_ptr->background), background_color, sizeof(png_color_16)); |
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97 | png_ptr->background_gamma = (float)background_gamma; |
98 | png_ptr->background_gamma_type = (png_byte)(background_gamma_code); | |
99 | png_ptr->transformations |= (need_expand ? PNG_BACKGROUND_EXPAND : 0); | |
a626cc03 RR |
100 | |
101 | /* Note: if need_expand is set and color_type is either RGB or RGB_ALPHA | |
102 | * (in which case need_expand is superfluous anyway), the background color | |
103 | * might actually be gray yet not be flagged as such. This is not a problem | |
104 | * for the current code, which uses PNG_FLAG_BACKGROUND_IS_GRAY only to | |
105 | * decide when to do the png_do_gray_to_rgb() transformation. | |
106 | */ | |
107 | if ((need_expand && !(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) || | |
108 | (!need_expand && background_color->red == background_color->green && | |
109 | background_color->red == background_color->blue)) | |
110 | png_ptr->flags |= PNG_FLAG_BACKGROUND_IS_GRAY; | |
c801d85f KB |
111 | } |
112 | #endif | |
113 | ||
114 | #if defined(PNG_READ_16_TO_8_SUPPORTED) | |
115 | /* strip 16 bit depth files to 8 bit depth */ | |
116 | void | |
117 | png_set_strip_16(png_structp png_ptr) | |
118 | { | |
119 | png_debug(1, "in png_set_strip_16\n"); | |
120 | png_ptr->transformations |= PNG_16_TO_8; | |
121 | } | |
122 | #endif | |
123 | ||
124 | #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) | |
125 | void | |
126 | png_set_strip_alpha(png_structp png_ptr) | |
127 | { | |
128 | png_debug(1, "in png_set_strip_alpha\n"); | |
129 | png_ptr->transformations |= PNG_STRIP_ALPHA; | |
130 | } | |
131 | #endif | |
132 | ||
133 | #if defined(PNG_READ_DITHER_SUPPORTED) | |
134 | /* Dither file to 8 bit. Supply a palette, the current number | |
135 | * of elements in the palette, the maximum number of elements | |
136 | * allowed, and a histogram if possible. If the current number | |
137 | * of colors is greater then the maximum number, the palette will be | |
138 | * modified to fit in the maximum number. "full_dither" indicates | |
139 | * whether we need a dithering cube set up for RGB images, or if we | |
140 | * simply are reducing the number of colors in a paletted image. | |
141 | */ | |
142 | ||
143 | typedef struct png_dsort_struct | |
144 | { | |
145 | struct png_dsort_struct FAR * next; | |
146 | png_byte left; | |
147 | png_byte right; | |
148 | } png_dsort; | |
149 | typedef png_dsort FAR * png_dsortp; | |
150 | typedef png_dsort FAR * FAR * png_dsortpp; | |
151 | ||
152 | void | |
153 | png_set_dither(png_structp png_ptr, png_colorp palette, | |
154 | int num_palette, int maximum_colors, png_uint_16p histogram, | |
155 | int full_dither) | |
156 | { | |
157 | png_debug(1, "in png_set_dither\n"); | |
158 | png_ptr->transformations |= PNG_DITHER; | |
159 | ||
160 | if (!full_dither) | |
161 | { | |
162 | int i; | |
163 | ||
164 | png_ptr->dither_index = (png_bytep)png_malloc(png_ptr, | |
165 | (png_uint_32)(num_palette * sizeof (png_byte))); | |
166 | for (i = 0; i < num_palette; i++) | |
167 | png_ptr->dither_index[i] = (png_byte)i; | |
168 | } | |
169 | ||
170 | if (num_palette > maximum_colors) | |
171 | { | |
172 | if (histogram != NULL) | |
173 | { | |
174 | /* This is easy enough, just throw out the least used colors. | |
175 | Perhaps not the best solution, but good enough. */ | |
176 | ||
177 | int i; | |
178 | png_bytep sort; | |
179 | ||
180 | /* initialize an array to sort colors */ | |
181 | sort = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_palette | |
182 | * sizeof (png_byte))); | |
183 | ||
184 | /* initialize the sort array */ | |
185 | for (i = 0; i < num_palette; i++) | |
186 | sort[i] = (png_byte)i; | |
187 | ||
188 | /* Find the least used palette entries by starting a | |
189 | bubble sort, and running it until we have sorted | |
190 | out enough colors. Note that we don't care about | |
191 | sorting all the colors, just finding which are | |
192 | least used. */ | |
193 | ||
194 | for (i = num_palette - 1; i >= maximum_colors; i--) | |
195 | { | |
196 | int done; /* to stop early if the list is pre-sorted */ | |
197 | int j; | |
198 | ||
199 | done = 1; | |
200 | for (j = 0; j < i; j++) | |
201 | { | |
202 | if (histogram[sort[j]] < histogram[sort[j + 1]]) | |
203 | { | |
204 | png_byte t; | |
205 | ||
206 | t = sort[j]; | |
207 | sort[j] = sort[j + 1]; | |
208 | sort[j + 1] = t; | |
209 | done = 0; | |
210 | } | |
211 | } | |
212 | if (done) | |
213 | break; | |
214 | } | |
215 | ||
216 | /* swap the palette around, and set up a table, if necessary */ | |
217 | if (full_dither) | |
218 | { | |
a626cc03 | 219 | int j = num_palette; |
c801d85f KB |
220 | |
221 | /* put all the useful colors within the max, but don't | |
222 | move the others */ | |
a626cc03 | 223 | for (i = 0; i < maximum_colors; i++) |
c801d85f KB |
224 | { |
225 | if ((int)sort[i] >= maximum_colors) | |
226 | { | |
227 | do | |
228 | j--; | |
229 | while ((int)sort[j] >= maximum_colors); | |
230 | palette[i] = palette[j]; | |
231 | } | |
232 | } | |
233 | } | |
234 | else | |
235 | { | |
a626cc03 | 236 | int j = num_palette; |
c801d85f KB |
237 | |
238 | /* move all the used colors inside the max limit, and | |
239 | develop a translation table */ | |
a626cc03 | 240 | for (i = 0; i < maximum_colors; i++) |
c801d85f KB |
241 | { |
242 | /* only move the colors we need to */ | |
243 | if ((int)sort[i] >= maximum_colors) | |
244 | { | |
245 | png_color tmp_color; | |
246 | ||
247 | do | |
248 | j--; | |
249 | while ((int)sort[j] >= maximum_colors); | |
250 | ||
251 | tmp_color = palette[j]; | |
252 | palette[j] = palette[i]; | |
253 | palette[i] = tmp_color; | |
254 | /* indicate where the color went */ | |
255 | png_ptr->dither_index[j] = (png_byte)i; | |
256 | png_ptr->dither_index[i] = (png_byte)j; | |
257 | } | |
258 | } | |
259 | ||
260 | /* find closest color for those colors we are not using */ | |
261 | for (i = 0; i < num_palette; i++) | |
262 | { | |
263 | if ((int)png_ptr->dither_index[i] >= maximum_colors) | |
264 | { | |
265 | int min_d, k, min_k, d_index; | |
266 | ||
267 | /* find the closest color to one we threw out */ | |
268 | d_index = png_ptr->dither_index[i]; | |
269 | min_d = PNG_COLOR_DIST(palette[d_index], palette[0]); | |
270 | for (k = 1, min_k = 0; k < maximum_colors; k++) | |
271 | { | |
272 | int d; | |
273 | ||
274 | d = PNG_COLOR_DIST(palette[d_index], palette[k]); | |
275 | ||
276 | if (d < min_d) | |
277 | { | |
278 | min_d = d; | |
279 | min_k = k; | |
280 | } | |
281 | } | |
282 | /* point to closest color */ | |
283 | png_ptr->dither_index[i] = (png_byte)min_k; | |
284 | } | |
285 | } | |
286 | } | |
287 | png_free(png_ptr, sort); | |
288 | } | |
289 | else | |
290 | { | |
291 | /* This is much harder to do simply (and quickly). Perhaps | |
292 | we need to go through a median cut routine, but those | |
293 | don't always behave themselves with only a few colors | |
294 | as input. So we will just find the closest two colors, | |
295 | and throw out one of them (chosen somewhat randomly). | |
a626cc03 RR |
296 | [We don't understand this at all, so if someone wants to |
297 | work on improving it, be our guest - AED, GRP] | |
c801d85f KB |
298 | */ |
299 | int i; | |
300 | int max_d; | |
301 | int num_new_palette; | |
302 | png_dsortpp hash; | |
303 | png_bytep index_to_palette; | |
304 | /* where the original index currently is in the palette */ | |
305 | png_bytep palette_to_index; | |
306 | /* which original index points to this palette color */ | |
307 | ||
308 | /* initialize palette index arrays */ | |
309 | index_to_palette = (png_bytep)png_malloc(png_ptr, | |
310 | (png_uint_32)(num_palette * sizeof (png_byte))); | |
311 | palette_to_index = (png_bytep)png_malloc(png_ptr, | |
312 | (png_uint_32)(num_palette * sizeof (png_byte))); | |
313 | ||
314 | /* initialize the sort array */ | |
315 | for (i = 0; i < num_palette; i++) | |
316 | { | |
317 | index_to_palette[i] = (png_byte)i; | |
318 | palette_to_index[i] = (png_byte)i; | |
319 | } | |
320 | ||
a626cc03 | 321 | hash = (png_dsortpp)png_malloc(png_ptr, (png_uint_32)(769 * |
c801d85f KB |
322 | sizeof (png_dsortp))); |
323 | for (i = 0; i < 769; i++) | |
324 | hash[i] = NULL; | |
325 | /* png_memset(hash, 0, 769 * sizeof (png_dsortp)); */ | |
326 | ||
327 | num_new_palette = num_palette; | |
328 | ||
329 | /* initial wild guess at how far apart the farthest pixel | |
330 | pair we will be eliminating will be. Larger | |
331 | numbers mean more areas will be allocated, Smaller | |
332 | numbers run the risk of not saving enough data, and | |
333 | having to do this all over again. | |
334 | ||
335 | I have not done extensive checking on this number. | |
336 | */ | |
337 | max_d = 96; | |
338 | ||
339 | while (num_new_palette > maximum_colors) | |
340 | { | |
341 | for (i = 0; i < num_new_palette - 1; i++) | |
342 | { | |
343 | int j; | |
344 | ||
345 | for (j = i + 1; j < num_new_palette; j++) | |
346 | { | |
347 | int d; | |
348 | ||
349 | d = PNG_COLOR_DIST(palette[i], palette[j]); | |
350 | ||
351 | if (d <= max_d) | |
352 | { | |
353 | png_dsortp t; | |
354 | ||
355 | t = (png_dsortp)png_malloc(png_ptr, (png_uint_32)(sizeof | |
356 | (png_dsort))); | |
357 | t->next = hash[d]; | |
358 | t->left = (png_byte)i; | |
359 | t->right = (png_byte)j; | |
360 | hash[d] = t; | |
361 | } | |
362 | } | |
363 | } | |
364 | ||
365 | for (i = 0; i <= max_d; i++) | |
366 | { | |
367 | if (hash[i] != NULL) | |
368 | { | |
369 | png_dsortp p; | |
370 | ||
371 | for (p = hash[i]; p; p = p->next) | |
372 | { | |
373 | if ((int)index_to_palette[p->left] < num_new_palette && | |
374 | (int)index_to_palette[p->right] < num_new_palette) | |
375 | { | |
376 | int j, next_j; | |
377 | ||
378 | if (num_new_palette & 1) | |
379 | { | |
380 | j = p->left; | |
381 | next_j = p->right; | |
382 | } | |
383 | else | |
384 | { | |
385 | j = p->right; | |
386 | next_j = p->left; | |
387 | } | |
388 | ||
389 | num_new_palette--; | |
390 | palette[index_to_palette[j]] = palette[num_new_palette]; | |
391 | if (!full_dither) | |
392 | { | |
393 | int k; | |
394 | ||
395 | for (k = 0; k < num_palette; k++) | |
396 | { | |
397 | if (png_ptr->dither_index[k] == | |
398 | index_to_palette[j]) | |
399 | png_ptr->dither_index[k] = | |
400 | index_to_palette[next_j]; | |
401 | if ((int)png_ptr->dither_index[k] == | |
402 | num_new_palette) | |
403 | png_ptr->dither_index[k] = | |
404 | index_to_palette[j]; | |
405 | } | |
406 | } | |
407 | ||
408 | index_to_palette[palette_to_index[num_new_palette]] = | |
409 | index_to_palette[j]; | |
410 | palette_to_index[index_to_palette[j]] = | |
411 | palette_to_index[num_new_palette]; | |
412 | ||
413 | index_to_palette[j] = (png_byte)num_new_palette; | |
414 | palette_to_index[num_new_palette] = (png_byte)j; | |
415 | } | |
416 | if (num_new_palette <= maximum_colors) | |
417 | break; | |
418 | } | |
419 | if (num_new_palette <= maximum_colors) | |
420 | break; | |
421 | } | |
422 | } | |
423 | ||
424 | for (i = 0; i < 769; i++) | |
425 | { | |
426 | if (hash[i] != NULL) | |
427 | { | |
a626cc03 | 428 | png_dsortp p = hash[i]; |
c801d85f KB |
429 | while (p) |
430 | { | |
431 | png_dsortp t; | |
432 | ||
433 | t = p->next; | |
434 | png_free(png_ptr, p); | |
435 | p = t; | |
436 | } | |
437 | } | |
438 | hash[i] = 0; | |
439 | } | |
440 | max_d += 96; | |
441 | } | |
442 | png_free(png_ptr, hash); | |
443 | png_free(png_ptr, palette_to_index); | |
444 | png_free(png_ptr, index_to_palette); | |
445 | } | |
446 | num_palette = maximum_colors; | |
447 | } | |
448 | if (png_ptr->palette == NULL) | |
449 | { | |
450 | png_ptr->palette = palette; | |
451 | } | |
452 | png_ptr->num_palette = (png_uint_16)num_palette; | |
453 | ||
454 | if (full_dither) | |
455 | { | |
456 | int i; | |
c801d85f | 457 | png_bytep distance; |
a626cc03 | 458 | int total_bits = PNG_DITHER_RED_BITS + PNG_DITHER_GREEN_BITS + |
c801d85f | 459 | PNG_DITHER_BLUE_BITS; |
a626cc03 RR |
460 | int num_red = (1 << PNG_DITHER_RED_BITS); |
461 | int num_green = (1 << PNG_DITHER_GREEN_BITS); | |
462 | int num_blue = (1 << PNG_DITHER_BLUE_BITS); | |
463 | png_size_t num_entries = ((png_size_t)1 << total_bits); | |
c801d85f KB |
464 | |
465 | png_ptr->palette_lookup = (png_bytep )png_malloc(png_ptr, | |
466 | (png_uint_32)(num_entries * sizeof (png_byte))); | |
467 | ||
468 | png_memset(png_ptr->palette_lookup, 0, num_entries * sizeof (png_byte)); | |
469 | ||
470 | distance = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_entries * | |
471 | sizeof(png_byte))); | |
472 | ||
473 | png_memset(distance, 0xff, num_entries * sizeof(png_byte)); | |
474 | ||
475 | for (i = 0; i < num_palette; i++) | |
476 | { | |
a626cc03 RR |
477 | int ir, ig, ib; |
478 | int r = (palette[i].red >> (8 - PNG_DITHER_RED_BITS)); | |
479 | int g = (palette[i].green >> (8 - PNG_DITHER_GREEN_BITS)); | |
480 | int b = (palette[i].blue >> (8 - PNG_DITHER_BLUE_BITS)); | |
c801d85f KB |
481 | |
482 | for (ir = 0; ir < num_red; ir++) | |
483 | { | |
a626cc03 RR |
484 | int dr = abs(ir - r); |
485 | int index_r = (ir << (PNG_DITHER_BLUE_BITS + PNG_DITHER_GREEN_BITS)); | |
c801d85f | 486 | |
c801d85f KB |
487 | for (ig = 0; ig < num_green; ig++) |
488 | { | |
a626cc03 RR |
489 | int dg = abs(ig - g); |
490 | int dt = dr + dg; | |
491 | int dm = ((dr > dg) ? dr : dg); | |
492 | int index_g = index_r | (ig << PNG_DITHER_BLUE_BITS); | |
c801d85f | 493 | |
c801d85f KB |
494 | for (ib = 0; ib < num_blue; ib++) |
495 | { | |
a626cc03 RR |
496 | int d_index = index_g | ib; |
497 | int db = abs(ib - b); | |
498 | int dmax = ((dm > db) ? dm : db); | |
499 | int d = dmax + dt + db; | |
c801d85f KB |
500 | |
501 | if (d < (int)distance[d_index]) | |
502 | { | |
503 | distance[d_index] = (png_byte)d; | |
504 | png_ptr->palette_lookup[d_index] = (png_byte)i; | |
505 | } | |
506 | } | |
507 | } | |
508 | } | |
509 | } | |
510 | ||
511 | png_free(png_ptr, distance); | |
512 | } | |
513 | } | |
514 | #endif | |
515 | ||
516 | #if defined(PNG_READ_GAMMA_SUPPORTED) | |
517 | /* Transform the image from the file_gamma to the screen_gamma. We | |
518 | * only do transformations on images where the file_gamma and screen_gamma | |
519 | * are not close reciprocals, otherwise it slows things down slightly, and | |
520 | * also needlessly introduces small errors. | |
521 | */ | |
522 | void | |
523 | png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma) | |
524 | { | |
525 | png_debug(1, "in png_set_gamma\n"); | |
526 | if (fabs(scrn_gamma * file_gamma - 1.0) > PNG_GAMMA_THRESHOLD) | |
527 | png_ptr->transformations |= PNG_GAMMA; | |
528 | png_ptr->gamma = (float)file_gamma; | |
529 | png_ptr->screen_gamma = (float)scrn_gamma; | |
530 | } | |
531 | #endif | |
532 | ||
533 | #if defined(PNG_READ_EXPAND_SUPPORTED) | |
534 | /* Expand paletted images to rgb, expand grayscale images of | |
a626cc03 | 535 | * less than 8 bit depth to 8 bit depth, and expand tRNS chunks |
c801d85f KB |
536 | * to alpha channels. |
537 | */ | |
538 | void | |
539 | png_set_expand(png_structp png_ptr) | |
540 | { | |
541 | png_debug(1, "in png_set_expand\n"); | |
542 | png_ptr->transformations |= PNG_EXPAND; | |
543 | } | |
544 | #endif | |
545 | ||
546 | #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) | |
547 | void | |
548 | png_set_gray_to_rgb(png_structp png_ptr) | |
549 | { | |
550 | png_debug(1, "in png_set_gray_to_rgb\n"); | |
551 | png_ptr->transformations |= PNG_GRAY_TO_RGB; | |
552 | } | |
553 | #endif | |
554 | ||
555 | #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) | |
a626cc03 RR |
556 | /* Convert a RGB image to a grayscale of the same width. This allows us, |
557 | * for example, to convert a 24 bpp RGB image into an 8 bpp grayscale image. | |
c801d85f KB |
558 | */ |
559 | void | |
a626cc03 RR |
560 | png_set_rgb_to_gray(png_structp png_ptr, int error_action, float red, |
561 | float green) | |
c801d85f KB |
562 | { |
563 | png_debug(1, "in png_set_rgb_to_gray\n"); | |
a626cc03 RR |
564 | switch(error_action) |
565 | { | |
566 | case 1: png_ptr->transformations |= PNG_RGB_TO_GRAY; | |
567 | break; | |
568 | case 2: png_ptr->transformations |= PNG_RGB_TO_GRAY_WARN; | |
569 | break; | |
570 | case 3: png_ptr->transformations |= PNG_RGB_TO_GRAY_ERR; | |
571 | } | |
572 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) | |
573 | #if defined(PNG_READ_EXPAND_SUPPORTED) | |
574 | png_ptr->transformations |= PNG_EXPAND; | |
575 | #else | |
576 | { | |
577 | png_warning(png_ptr, "Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED."); | |
578 | png_ptr->transformations &= ~PNG_RGB_TO_GRAY; | |
579 | } | |
580 | #endif | |
581 | { | |
582 | png_byte red_byte = (png_byte)(red*255.0 + 0.5); | |
583 | png_byte green_byte = (png_byte)(green*255.0 + 0.5); | |
584 | if(red < 0.0 || green < 0.0) | |
585 | { | |
586 | red_byte = 54; | |
587 | green_byte = 183; | |
588 | } | |
589 | else if(red_byte + green_byte > 255) | |
590 | { | |
591 | png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients"); | |
592 | red_byte = 54; | |
593 | green_byte = 183; | |
594 | } | |
595 | png_ptr->rgb_to_gray_red_coeff = red_byte; | |
596 | png_ptr->rgb_to_gray_green_coeff = green_byte; | |
597 | png_ptr->rgb_to_gray_blue_coeff = 255 - red_byte - green_byte; | |
598 | } | |
c801d85f KB |
599 | } |
600 | #endif | |
601 | ||
602 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) | |
603 | void | |
604 | png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr | |
605 | read_user_transform_fn) | |
606 | { | |
607 | png_debug(1, "in png_set_read_user_transform_fn\n"); | |
608 | png_ptr->transformations |= PNG_USER_TRANSFORM; | |
609 | png_ptr->read_user_transform_fn = read_user_transform_fn; | |
610 | } | |
611 | #endif | |
612 | ||
613 | /* Initialize everything needed for the read. This includes modifying | |
614 | * the palette. | |
615 | */ | |
616 | void | |
617 | png_init_read_transformations(png_structp png_ptr) | |
618 | { | |
c801d85f | 619 | png_debug(1, "in png_init_read_transformations\n"); |
a626cc03 RR |
620 | #if defined(PNG_USELESS_TESTS_SUPPORTED) |
621 | if(png_ptr != NULL) | |
622 | #endif | |
623 | { | |
624 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) || defined(PNG_READ_SHIFT_SUPPORTED) \ | |
625 | || defined(PNG_READ_GAMMA_SUPPORTED) | |
626 | int color_type = png_ptr->color_type; | |
627 | #endif | |
c801d85f KB |
628 | |
629 | #if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED) | |
630 | if (png_ptr->transformations & PNG_BACKGROUND_EXPAND) | |
631 | { | |
a626cc03 | 632 | if (!(color_type & PNG_COLOR_MASK_COLOR)) /* i.e., GRAY or GRAY_ALPHA */ |
c801d85f KB |
633 | { |
634 | /* expand background chunk. */ | |
635 | switch (png_ptr->bit_depth) | |
636 | { | |
637 | case 1: | |
638 | png_ptr->background.gray *= (png_uint_16)0xff; | |
639 | png_ptr->background.red = png_ptr->background.green = | |
640 | png_ptr->background.blue = png_ptr->background.gray; | |
641 | break; | |
642 | case 2: | |
643 | png_ptr->background.gray *= (png_uint_16)0x55; | |
644 | png_ptr->background.red = png_ptr->background.green = | |
645 | png_ptr->background.blue = png_ptr->background.gray; | |
646 | break; | |
647 | case 4: | |
648 | png_ptr->background.gray *= (png_uint_16)0x11; | |
649 | png_ptr->background.red = png_ptr->background.green = | |
650 | png_ptr->background.blue = png_ptr->background.gray; | |
651 | break; | |
652 | case 8: | |
653 | case 16: | |
654 | png_ptr->background.red = png_ptr->background.green = | |
655 | png_ptr->background.blue = png_ptr->background.gray; | |
656 | break; | |
657 | } | |
658 | } | |
659 | else if (color_type == PNG_COLOR_TYPE_PALETTE) | |
660 | { | |
661 | png_ptr->background.red = | |
662 | png_ptr->palette[png_ptr->background.index].red; | |
663 | png_ptr->background.green = | |
664 | png_ptr->palette[png_ptr->background.index].green; | |
665 | png_ptr->background.blue = | |
666 | png_ptr->palette[png_ptr->background.index].blue; | |
667 | ||
668 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) | |
669 | if (png_ptr->transformations & PNG_INVERT_ALPHA) | |
670 | { | |
671 | #if defined(PNG_READ_EXPAND_SUPPORTED) | |
672 | if (!(png_ptr->transformations & PNG_EXPAND)) | |
673 | #endif | |
674 | { | |
a626cc03 | 675 | /* invert the alpha channel (in tRNS) unless the pixels are |
c801d85f | 676 | going to be expanded, in which case leave it for later */ |
a626cc03 RR |
677 | int i,istop; |
678 | istop=(int)png_ptr->num_trans; | |
679 | for (i=0; i<istop; i++) | |
c801d85f KB |
680 | png_ptr->trans[i] = 255 - png_ptr->trans[i]; |
681 | } | |
682 | } | |
683 | #endif | |
684 | ||
685 | } | |
686 | } | |
687 | #endif | |
688 | ||
689 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) | |
690 | png_ptr->background_1 = png_ptr->background; | |
691 | #endif | |
692 | #if defined(PNG_READ_GAMMA_SUPPORTED) | |
a626cc03 | 693 | if (png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY)) |
c801d85f KB |
694 | { |
695 | png_build_gamma_table(png_ptr); | |
696 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) | |
697 | if (png_ptr->transformations & PNG_BACKGROUND) | |
698 | { | |
699 | if (color_type == PNG_COLOR_TYPE_PALETTE) | |
700 | { | |
c801d85f | 701 | png_color back, back_1; |
a626cc03 RR |
702 | png_colorp palette = png_ptr->palette; |
703 | int num_palette = png_ptr->num_palette; | |
704 | int i; | |
c801d85f KB |
705 | |
706 | if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE) | |
707 | { | |
708 | back.red = png_ptr->gamma_table[png_ptr->background.red]; | |
709 | back.green = png_ptr->gamma_table[png_ptr->background.green]; | |
710 | back.blue = png_ptr->gamma_table[png_ptr->background.blue]; | |
711 | ||
712 | back_1.red = png_ptr->gamma_to_1[png_ptr->background.red]; | |
713 | back_1.green = png_ptr->gamma_to_1[png_ptr->background.green]; | |
714 | back_1.blue = png_ptr->gamma_to_1[png_ptr->background.blue]; | |
715 | } | |
716 | else | |
717 | { | |
718 | double g, gs; | |
719 | ||
720 | switch (png_ptr->background_gamma_type) | |
721 | { | |
722 | case PNG_BACKGROUND_GAMMA_SCREEN: | |
723 | g = (png_ptr->screen_gamma); | |
724 | gs = 1.0; | |
725 | break; | |
726 | case PNG_BACKGROUND_GAMMA_FILE: | |
727 | g = 1.0 / (png_ptr->gamma); | |
728 | gs = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma); | |
729 | break; | |
730 | case PNG_BACKGROUND_GAMMA_UNIQUE: | |
731 | g = 1.0 / (png_ptr->background_gamma); | |
732 | gs = 1.0 / (png_ptr->background_gamma * | |
733 | png_ptr->screen_gamma); | |
734 | break; | |
735 | default: | |
736 | g = 1.0; /* back_1 */ | |
737 | gs = 1.0; /* back */ | |
738 | } | |
739 | ||
740 | if ( fabs(gs - 1.0) < PNG_GAMMA_THRESHOLD) | |
741 | { | |
742 | back.red = (png_byte)png_ptr->background.red; | |
743 | back.green = (png_byte)png_ptr->background.green; | |
744 | back.blue = (png_byte)png_ptr->background.blue; | |
745 | } | |
746 | else | |
747 | { | |
748 | back.red = (png_byte)(pow( | |
749 | (double)png_ptr->background.red/255, gs) * 255.0 + .5); | |
750 | back.green = (png_byte)(pow( | |
751 | (double)png_ptr->background.green/255, gs) * 255.0 + .5); | |
752 | back.blue = (png_byte)(pow( | |
753 | (double)png_ptr->background.blue/255, gs) * 255.0 + .5); | |
754 | } | |
755 | ||
756 | back_1.red = (png_byte)(pow( | |
757 | (double)png_ptr->background.red/255, g) * 255.0 + .5); | |
758 | back_1.green = (png_byte)(pow( | |
759 | (double)png_ptr->background.green/255, g) * 255.0 + .5); | |
760 | back_1.blue = (png_byte)(pow( | |
761 | (double)png_ptr->background.blue/255, g) * 255.0 + .5); | |
762 | } | |
763 | ||
764 | for (i = 0; i < num_palette; i++) | |
765 | { | |
766 | if (i < (int)png_ptr->num_trans && png_ptr->trans[i] != 0xff) | |
767 | { | |
768 | if (png_ptr->trans[i] == 0) | |
769 | { | |
770 | palette[i] = back; | |
771 | } | |
772 | else /* if (png_ptr->trans[i] != 0xff) */ | |
773 | { | |
774 | png_byte v, w; | |
775 | ||
776 | v = png_ptr->gamma_to_1[palette[i].red]; | |
777 | png_composite(w, v, png_ptr->trans[i], back_1.red); | |
778 | palette[i].red = png_ptr->gamma_from_1[w]; | |
779 | ||
780 | v = png_ptr->gamma_to_1[palette[i].green]; | |
781 | png_composite(w, v, png_ptr->trans[i], back_1.green); | |
782 | palette[i].green = png_ptr->gamma_from_1[w]; | |
783 | ||
784 | v = png_ptr->gamma_to_1[palette[i].blue]; | |
785 | png_composite(w, v, png_ptr->trans[i], back_1.blue); | |
786 | palette[i].blue = png_ptr->gamma_from_1[w]; | |
787 | } | |
788 | } | |
789 | else | |
790 | { | |
791 | palette[i].red = png_ptr->gamma_table[palette[i].red]; | |
792 | palette[i].green = png_ptr->gamma_table[palette[i].green]; | |
793 | palette[i].blue = png_ptr->gamma_table[palette[i].blue]; | |
794 | } | |
795 | } | |
796 | } | |
797 | /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN)*/ | |
798 | else | |
799 | /* color_type != PNG_COLOR_TYPE_PALETTE */ | |
800 | { | |
a626cc03 RR |
801 | double m = (double)(((png_uint_32)1 << png_ptr->bit_depth) - 1); |
802 | double g = 1.0; | |
803 | double gs = 1.0; | |
c801d85f KB |
804 | |
805 | switch (png_ptr->background_gamma_type) | |
806 | { | |
807 | case PNG_BACKGROUND_GAMMA_SCREEN: | |
808 | g = (png_ptr->screen_gamma); | |
809 | gs = 1.0; | |
810 | break; | |
811 | case PNG_BACKGROUND_GAMMA_FILE: | |
812 | g = 1.0 / (png_ptr->gamma); | |
813 | gs = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma); | |
814 | break; | |
815 | case PNG_BACKGROUND_GAMMA_UNIQUE: | |
816 | g = 1.0 / (png_ptr->background_gamma); | |
817 | gs = 1.0 / (png_ptr->background_gamma * | |
818 | png_ptr->screen_gamma); | |
819 | break; | |
820 | } | |
821 | ||
822 | if (color_type & PNG_COLOR_MASK_COLOR) | |
823 | { | |
824 | /* RGB or RGBA */ | |
825 | png_ptr->background_1.red = (png_uint_16)(pow( | |
826 | (double)png_ptr->background.red / m, g) * m + .5); | |
827 | png_ptr->background_1.green = (png_uint_16)(pow( | |
828 | (double)png_ptr->background.green / m, g) * m + .5); | |
829 | png_ptr->background_1.blue = (png_uint_16)(pow( | |
830 | (double)png_ptr->background.blue / m, g) * m + .5); | |
831 | png_ptr->background.red = (png_uint_16)(pow( | |
832 | (double)png_ptr->background.red / m, gs) * m + .5); | |
833 | png_ptr->background.green = (png_uint_16)(pow( | |
834 | (double)png_ptr->background.green / m, gs) * m + .5); | |
835 | png_ptr->background.blue = (png_uint_16)(pow( | |
836 | (double)png_ptr->background.blue / m, gs) * m + .5); | |
837 | } | |
838 | else | |
839 | { | |
840 | /* GRAY or GRAY ALPHA */ | |
841 | png_ptr->background_1.gray = (png_uint_16)(pow( | |
842 | (double)png_ptr->background.gray / m, g) * m + .5); | |
843 | png_ptr->background.gray = (png_uint_16)(pow( | |
844 | (double)png_ptr->background.gray / m, gs) * m + .5); | |
845 | } | |
846 | } | |
847 | } | |
848 | else | |
849 | /* transformation does not include PNG_BACKGROUND */ | |
850 | #endif | |
851 | if (color_type == PNG_COLOR_TYPE_PALETTE) | |
852 | { | |
a626cc03 RR |
853 | png_colorp palette = png_ptr->palette; |
854 | int num_palette = png_ptr->num_palette; | |
855 | int i; | |
c801d85f KB |
856 | |
857 | for (i = 0; i < num_palette; i++) | |
858 | { | |
859 | palette[i].red = png_ptr->gamma_table[palette[i].red]; | |
860 | palette[i].green = png_ptr->gamma_table[palette[i].green]; | |
861 | palette[i].blue = png_ptr->gamma_table[palette[i].blue]; | |
862 | } | |
863 | } | |
864 | } | |
865 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) | |
866 | else | |
867 | #endif | |
868 | #endif | |
869 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) | |
870 | /* No GAMMA transformation */ | |
871 | if (png_ptr->transformations & PNG_BACKGROUND && | |
872 | color_type == PNG_COLOR_TYPE_PALETTE) | |
873 | { | |
874 | int i; | |
a626cc03 | 875 | int istop = (int)png_ptr->num_trans; |
c801d85f | 876 | png_color back; |
a626cc03 | 877 | png_colorp palette = png_ptr->palette; |
c801d85f | 878 | |
c801d85f KB |
879 | back.red = (png_byte)png_ptr->background.red; |
880 | back.green = (png_byte)png_ptr->background.green; | |
881 | back.blue = (png_byte)png_ptr->background.blue; | |
882 | ||
a626cc03 | 883 | for (i = 0; i < istop; i++) |
c801d85f KB |
884 | { |
885 | if (png_ptr->trans[i] == 0) | |
886 | { | |
887 | palette[i] = back; | |
888 | } | |
889 | else if (png_ptr->trans[i] != 0xff) | |
890 | { | |
a626cc03 | 891 | /* The png_composite() macro is defined in png.h */ |
c801d85f KB |
892 | png_composite(palette[i].red, palette[i].red, |
893 | png_ptr->trans[i], back.red); | |
894 | png_composite(palette[i].green, palette[i].green, | |
895 | png_ptr->trans[i], back.green); | |
896 | png_composite(palette[i].blue, palette[i].blue, | |
897 | png_ptr->trans[i], back.blue); | |
898 | } | |
899 | } | |
900 | } | |
901 | #endif | |
902 | ||
903 | #if defined(PNG_READ_SHIFT_SUPPORTED) | |
904 | if ((png_ptr->transformations & PNG_SHIFT) && | |
905 | color_type == PNG_COLOR_TYPE_PALETTE) | |
906 | { | |
907 | png_uint_16 i; | |
a626cc03 RR |
908 | png_uint_16 istop = png_ptr->num_palette; |
909 | int sr = 8 - png_ptr->sig_bit.red; | |
910 | int sg = 8 - png_ptr->sig_bit.green; | |
911 | int sb = 8 - png_ptr->sig_bit.blue; | |
c801d85f | 912 | |
c801d85f KB |
913 | if (sr < 0 || sr > 8) |
914 | sr = 0; | |
c801d85f KB |
915 | if (sg < 0 || sg > 8) |
916 | sg = 0; | |
c801d85f KB |
917 | if (sb < 0 || sb > 8) |
918 | sb = 0; | |
a626cc03 | 919 | for (i = 0; i < istop; i++) |
c801d85f KB |
920 | { |
921 | png_ptr->palette[i].red >>= sr; | |
922 | png_ptr->palette[i].green >>= sg; | |
923 | png_ptr->palette[i].blue >>= sb; | |
924 | } | |
925 | } | |
926 | #endif | |
a626cc03 | 927 | } |
c801d85f KB |
928 | } |
929 | ||
930 | /* Modify the info structure to reflect the transformations. The | |
931 | * info should be updated so a PNG file could be written with it, | |
932 | * assuming the transformations result in valid PNG data. | |
933 | */ | |
934 | void | |
935 | png_read_transform_info(png_structp png_ptr, png_infop info_ptr) | |
936 | { | |
937 | png_debug(1, "in png_read_transform_info\n"); | |
938 | #if defined(PNG_READ_EXPAND_SUPPORTED) | |
939 | if (png_ptr->transformations & PNG_EXPAND) | |
940 | { | |
941 | if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) | |
942 | { | |
943 | if (png_ptr->num_trans) | |
944 | info_ptr->color_type = PNG_COLOR_TYPE_RGB_ALPHA; | |
945 | else | |
946 | info_ptr->color_type = PNG_COLOR_TYPE_RGB; | |
947 | info_ptr->bit_depth = 8; | |
948 | info_ptr->num_trans = 0; | |
949 | } | |
950 | else | |
951 | { | |
952 | if (png_ptr->num_trans) | |
953 | info_ptr->color_type |= PNG_COLOR_MASK_ALPHA; | |
954 | if (info_ptr->bit_depth < 8) | |
955 | info_ptr->bit_depth = 8; | |
956 | info_ptr->num_trans = 0; | |
957 | } | |
958 | } | |
959 | #endif | |
960 | ||
961 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) | |
962 | if (png_ptr->transformations & PNG_BACKGROUND) | |
963 | { | |
964 | info_ptr->color_type &= ~PNG_COLOR_MASK_ALPHA; | |
965 | info_ptr->num_trans = 0; | |
966 | info_ptr->background = png_ptr->background; | |
967 | } | |
968 | #endif | |
969 | ||
a626cc03 RR |
970 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
971 | if (png_ptr->transformations & PNG_GAMMA) | |
972 | info_ptr->gamma = png_ptr->gamma; | |
973 | #endif | |
974 | ||
c801d85f KB |
975 | #if defined(PNG_READ_16_TO_8_SUPPORTED) |
976 | if ((png_ptr->transformations & PNG_16_TO_8) && info_ptr->bit_depth == 16) | |
977 | info_ptr->bit_depth = 8; | |
978 | #endif | |
979 | ||
980 | #if defined(PNG_READ_DITHER_SUPPORTED) | |
981 | if (png_ptr->transformations & PNG_DITHER) | |
982 | { | |
983 | if (((info_ptr->color_type == PNG_COLOR_TYPE_RGB) || | |
984 | (info_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)) && | |
985 | png_ptr->palette_lookup && info_ptr->bit_depth == 8) | |
986 | { | |
987 | info_ptr->color_type = PNG_COLOR_TYPE_PALETTE; | |
988 | } | |
989 | } | |
990 | #endif | |
991 | ||
992 | #if defined(PNG_READ_PACK_SUPPORTED) | |
993 | if ((png_ptr->transformations & PNG_PACK) && info_ptr->bit_depth < 8) | |
994 | info_ptr->bit_depth = 8; | |
995 | #endif | |
996 | ||
997 | #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) | |
998 | if (png_ptr->transformations & PNG_GRAY_TO_RGB) | |
999 | info_ptr->color_type |= PNG_COLOR_MASK_COLOR; | |
1000 | #endif | |
1001 | ||
a626cc03 RR |
1002 | #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
1003 | if (png_ptr->transformations & PNG_RGB_TO_GRAY) | |
1004 | info_ptr->color_type &= ~PNG_COLOR_MASK_COLOR; | |
1005 | #endif | |
1006 | ||
c801d85f KB |
1007 | if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
1008 | info_ptr->channels = 1; | |
1009 | else if (info_ptr->color_type & PNG_COLOR_MASK_COLOR) | |
1010 | info_ptr->channels = 3; | |
1011 | else | |
1012 | info_ptr->channels = 1; | |
1013 | ||
1014 | #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) | |
1015 | if (png_ptr->transformations & PNG_STRIP_ALPHA) | |
1016 | info_ptr->color_type &= ~PNG_COLOR_MASK_ALPHA; | |
1017 | #endif | |
1018 | ||
a626cc03 RR |
1019 | if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA) |
1020 | info_ptr->channels++; | |
1021 | ||
c801d85f | 1022 | #if defined(PNG_READ_FILLER_SUPPORTED) |
a626cc03 RR |
1023 | /* STRIP_ALPHA and FILLER allowed: MASK_ALPHA bit stripped above */ |
1024 | if (png_ptr->transformations & PNG_FILLER && | |
1025 | (info_ptr->color_type == PNG_COLOR_TYPE_RGB || | |
1026 | info_ptr->color_type == PNG_COLOR_TYPE_GRAY)) | |
1027 | ++info_ptr->channels; | |
c801d85f KB |
1028 | #endif |
1029 | ||
c801d85f KB |
1030 | info_ptr->pixel_depth = (png_byte)(info_ptr->channels * |
1031 | info_ptr->bit_depth); | |
c801d85f KB |
1032 | info_ptr->rowbytes = ((info_ptr->width * info_ptr->pixel_depth + 7) >> 3); |
1033 | } | |
1034 | ||
1035 | /* Transform the row. The order of transformations is significant, | |
1036 | * and is very touchy. If you add a transformation, take care to | |
1037 | * decide how it fits in with the other transformations here. | |
1038 | */ | |
1039 | void | |
1040 | png_do_read_transformations(png_structp png_ptr) | |
1041 | { | |
1042 | png_debug(1, "in png_do_read_transformations\n"); | |
1043 | #if !defined(PNG_USELESS_TESTS_SUPPORTED) | |
1044 | if (png_ptr->row_buf == NULL) | |
1045 | { | |
1046 | #if !defined(PNG_NO_STDIO) | |
1047 | char msg[50]; | |
1048 | ||
1049 | sprintf(msg, "NULL row buffer for row %ld, pass %d", png_ptr->row_number, | |
1050 | png_ptr->pass); | |
1051 | png_error(png_ptr, msg); | |
1052 | #else | |
1053 | png_error(png_ptr, "NULL row buffer"); | |
1054 | #endif | |
1055 | } | |
1056 | #endif | |
1057 | ||
1058 | #if defined(PNG_READ_EXPAND_SUPPORTED) | |
1059 | if (png_ptr->transformations & PNG_EXPAND) | |
1060 | { | |
1061 | if (png_ptr->row_info.color_type == PNG_COLOR_TYPE_PALETTE) | |
1062 | { | |
1063 | png_do_expand_palette(&(png_ptr->row_info), png_ptr->row_buf + 1, | |
1064 | png_ptr->palette, png_ptr->trans, png_ptr->num_trans); | |
1065 | } | |
a626cc03 | 1066 | else |
c801d85f KB |
1067 | { |
1068 | if (png_ptr->num_trans) | |
1069 | png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1, | |
1070 | &(png_ptr->trans_values)); | |
1071 | else | |
1072 | png_do_expand(&(png_ptr->row_info), png_ptr->row_buf + 1, | |
1073 | NULL); | |
1074 | } | |
1075 | } | |
1076 | #endif | |
1077 | ||
1078 | #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) | |
1079 | if (png_ptr->transformations & PNG_STRIP_ALPHA) | |
1080 | png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, | |
1081 | PNG_FLAG_FILLER_AFTER); | |
1082 | #endif | |
1083 | ||
a626cc03 RR |
1084 | #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
1085 | if (png_ptr->transformations & PNG_RGB_TO_GRAY) | |
1086 | { | |
1087 | int rgb_error = | |
1088 | png_do_rgb_to_gray(png_ptr, &(png_ptr->row_info), png_ptr->row_buf + 1); | |
1089 | if(rgb_error) | |
1090 | { | |
1091 | png_ptr->rgb_to_gray_status=1; | |
1092 | if(png_ptr->transformations == PNG_RGB_TO_GRAY_WARN) | |
1093 | png_warning(png_ptr, "png_do_rgb_to_gray found nongray pixel"); | |
1094 | if(png_ptr->transformations == PNG_RGB_TO_GRAY_ERR) | |
1095 | png_error(png_ptr, "png_do_rgb_to_gray found nongray pixel"); | |
1096 | } | |
1097 | } | |
1098 | #endif | |
1099 | ||
1100 | /* | |
1101 | From Andreas Dilger e-mail to png-implement, 26 March 1998: | |
1102 | ||
1103 | In most cases, the "simple transparency" should be done prior to doing | |
1104 | gray-to-RGB, or you will have to test 3x as many bytes to check if a | |
1105 | pixel is transparent. You would also need to make sure that the | |
1106 | transparency information is upgraded to RGB. | |
1107 | ||
1108 | To summarize, the current flow is: | |
1109 | - Gray + simple transparency -> compare 1 or 2 gray bytes and composite | |
1110 | with background "in place" if transparent, | |
1111 | convert to RGB if necessary | |
1112 | - Gray + alpha -> composite with gray background and remove alpha bytes, | |
1113 | convert to RGB if necessary | |
1114 | ||
1115 | To support RGB backgrounds for gray images we need: | |
1116 | - Gray + simple transparency -> convert to RGB + simple transparency, compare | |
1117 | 3 or 6 bytes and composite with background | |
1118 | "in place" if transparent (3x compare/pixel | |
1119 | compared to doing composite with gray bkgrnd) | |
1120 | - Gray + alpha -> convert to RGB + alpha, composite with background and | |
1121 | remove alpha bytes (3x float operations/pixel | |
1122 | compared with composite on gray background) | |
1123 | ||
1124 | Greg's change will do this. The reason it wasn't done before is for | |
1125 | performance, as this increases the per-pixel operations. If we would check | |
1126 | in advance if the background was gray or RGB, and position the gray-to-RGB | |
1127 | transform appropriately, then it would save a lot of work/time. | |
1128 | */ | |
1129 | ||
1130 | #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) | |
1131 | /* if gray -> RGB, do so now only if background is non-gray; else do later | |
1132 | * for performance reasons */ | |
1133 | if (png_ptr->transformations & PNG_GRAY_TO_RGB && | |
1134 | !(png_ptr->flags & PNG_FLAG_BACKGROUND_IS_GRAY)) | |
1135 | png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1); | |
1136 | #endif | |
1137 | ||
c801d85f KB |
1138 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
1139 | if ((png_ptr->transformations & PNG_BACKGROUND) && | |
1140 | ((png_ptr->num_trans != 0 ) || | |
1141 | (png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) | |
1142 | png_do_background(&(png_ptr->row_info), png_ptr->row_buf + 1, | |
1143 | &(png_ptr->trans_values), &(png_ptr->background), | |
1144 | &(png_ptr->background_1), | |
1145 | png_ptr->gamma_table, png_ptr->gamma_from_1, | |
1146 | png_ptr->gamma_to_1, png_ptr->gamma_16_table, | |
1147 | png_ptr->gamma_16_from_1, png_ptr->gamma_16_to_1, | |
1148 | png_ptr->gamma_shift); | |
1149 | #endif | |
1150 | ||
1151 | #if defined(PNG_READ_GAMMA_SUPPORTED) | |
1152 | if ((png_ptr->transformations & PNG_GAMMA) && | |
a626cc03 RR |
1153 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
1154 | !((png_ptr->transformations & PNG_BACKGROUND) && | |
1155 | ((png_ptr->num_trans != 0) || | |
1156 | (png_ptr->color_type & PNG_COLOR_MASK_ALPHA))) && | |
1157 | #endif | |
c801d85f KB |
1158 | (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)) |
1159 | png_do_gamma(&(png_ptr->row_info), png_ptr->row_buf + 1, | |
1160 | png_ptr->gamma_table, png_ptr->gamma_16_table, | |
1161 | png_ptr->gamma_shift); | |
1162 | #endif | |
1163 | ||
c801d85f KB |
1164 | #if defined(PNG_READ_16_TO_8_SUPPORTED) |
1165 | if (png_ptr->transformations & PNG_16_TO_8) | |
1166 | png_do_chop(&(png_ptr->row_info), png_ptr->row_buf + 1); | |
1167 | #endif | |
1168 | ||
1169 | #if defined(PNG_READ_DITHER_SUPPORTED) | |
1170 | if (png_ptr->transformations & PNG_DITHER) | |
1171 | { | |
1172 | png_do_dither((png_row_infop)&(png_ptr->row_info), png_ptr->row_buf + 1, | |
1173 | png_ptr->palette_lookup, png_ptr->dither_index); | |
1174 | if(png_ptr->row_info.rowbytes == (png_uint_32)0) | |
1175 | png_error(png_ptr, "png_do_dither returned rowbytes=0"); | |
1176 | } | |
1177 | #endif | |
1178 | ||
1179 | #if defined(PNG_READ_INVERT_SUPPORTED) | |
1180 | if (png_ptr->transformations & PNG_INVERT_MONO) | |
1181 | png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1); | |
1182 | #endif | |
1183 | ||
1184 | #if defined(PNG_READ_SHIFT_SUPPORTED) | |
1185 | if (png_ptr->transformations & PNG_SHIFT) | |
1186 | png_do_unshift(&(png_ptr->row_info), png_ptr->row_buf + 1, | |
1187 | &(png_ptr->shift)); | |
1188 | #endif | |
1189 | ||
1190 | #if defined(PNG_READ_PACK_SUPPORTED) | |
1191 | if (png_ptr->transformations & PNG_PACK) | |
1192 | png_do_unpack(&(png_ptr->row_info), png_ptr->row_buf + 1); | |
1193 | #endif | |
1194 | ||
1195 | #if defined(PNG_READ_BGR_SUPPORTED) | |
1196 | if (png_ptr->transformations & PNG_BGR) | |
1197 | png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1); | |
1198 | #endif | |
1199 | ||
1200 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) | |
1201 | if (png_ptr->transformations & PNG_PACKSWAP) | |
1202 | png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1); | |
1203 | #endif | |
1204 | ||
1205 | #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) | |
a626cc03 RR |
1206 | /* if gray -> RGB, do so now only if we did not do so above */ |
1207 | if (png_ptr->transformations & PNG_GRAY_TO_RGB && | |
1208 | png_ptr->flags & PNG_FLAG_BACKGROUND_IS_GRAY) | |
c801d85f KB |
1209 | png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1); |
1210 | #endif | |
1211 | ||
1212 | #if defined(PNG_READ_FILLER_SUPPORTED) | |
1213 | if (png_ptr->transformations & PNG_FILLER) | |
1214 | png_do_read_filler(&(png_ptr->row_info), png_ptr->row_buf + 1, | |
1215 | (png_uint_32)png_ptr->filler, png_ptr->flags); | |
1216 | #endif | |
1217 | ||
1218 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) | |
1219 | if (png_ptr->transformations & PNG_INVERT_ALPHA) | |
1220 | png_do_read_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); | |
1221 | #endif | |
1222 | ||
1223 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) | |
1224 | if (png_ptr->transformations & PNG_SWAP_ALPHA) | |
1225 | png_do_read_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1); | |
1226 | #endif | |
1227 | ||
1228 | #if defined(PNG_READ_SWAP_SUPPORTED) | |
1229 | if (png_ptr->transformations & PNG_SWAP_BYTES) | |
1230 | png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1); | |
1231 | #endif | |
1232 | ||
1233 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) | |
1234 | if (png_ptr->transformations & PNG_USER_TRANSFORM) | |
1235 | if(png_ptr->read_user_transform_fn != NULL) | |
1236 | (*(png_ptr->read_user_transform_fn)) /* user read transform function */ | |
1237 | (png_ptr, /* png_ptr */ | |
1238 | &(png_ptr->row_info), /* row_info: */ | |
1239 | /* png_uint_32 width; width of row */ | |
1240 | /* png_uint_32 rowbytes; number of bytes in row */ | |
1241 | /* png_byte color_type; color type of pixels */ | |
1242 | /* png_byte bit_depth; bit depth of samples */ | |
1243 | /* png_byte channels; number of channels (1-4) */ | |
1244 | /* png_byte pixel_depth; bits per pixel (depth*channels) */ | |
1245 | png_ptr->row_buf + 1); /* start of pixel data for row */ | |
1246 | #endif | |
1247 | ||
1248 | } | |
1249 | ||
1250 | #if defined(PNG_READ_PACK_SUPPORTED) | |
1251 | /* Unpack pixels of 1, 2, or 4 bits per pixel into 1 byte per pixel, | |
1252 | * without changing the actual values. Thus, if you had a row with | |
1253 | * a bit depth of 1, you would end up with bytes that only contained | |
1254 | * the numbers 0 or 1. If you would rather they contain 0 and 255, use | |
1255 | * png_do_shift() after this. | |
1256 | */ | |
1257 | void | |
1258 | png_do_unpack(png_row_infop row_info, png_bytep row) | |
1259 | { | |
1260 | png_debug(1, "in png_do_unpack\n"); | |
1261 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
1262 | if (row != NULL && row_info != NULL && row_info->bit_depth < 8) | |
1263 | #else | |
1264 | if (row_info->bit_depth < 8) | |
1265 | #endif | |
1266 | { | |
a626cc03 RR |
1267 | png_uint_32 i; |
1268 | png_uint_32 row_width=row_info->width; | |
c801d85f KB |
1269 | |
1270 | switch (row_info->bit_depth) | |
1271 | { | |
1272 | case 1: | |
1273 | { | |
a626cc03 RR |
1274 | png_bytep sp = row + (png_size_t)((row_width - 1) >> 3); |
1275 | png_bytep dp = row + (png_size_t)row_width - 1; | |
1276 | png_uint_32 shift = 7 - (int)((row_width + 7) & 7); | |
1277 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
1278 | { |
1279 | *dp = (png_byte)((*sp >> shift) & 0x1); | |
1280 | if (shift == 7) | |
1281 | { | |
1282 | shift = 0; | |
1283 | sp--; | |
1284 | } | |
1285 | else | |
1286 | shift++; | |
1287 | ||
1288 | dp--; | |
1289 | } | |
1290 | break; | |
1291 | } | |
1292 | case 2: | |
1293 | { | |
1294 | ||
a626cc03 RR |
1295 | png_bytep sp = row + (png_size_t)((row_width - 1) >> 2); |
1296 | png_bytep dp = row + (png_size_t)row_width - 1; | |
1297 | png_uint_32 shift = (int)((3 - ((row_width + 3) & 3)) << 1); | |
1298 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
1299 | { |
1300 | *dp = (png_byte)((*sp >> shift) & 0x3); | |
1301 | if (shift == 6) | |
1302 | { | |
1303 | shift = 0; | |
1304 | sp--; | |
1305 | } | |
1306 | else | |
1307 | shift += 2; | |
1308 | ||
1309 | dp--; | |
1310 | } | |
1311 | break; | |
1312 | } | |
1313 | case 4: | |
1314 | { | |
a626cc03 RR |
1315 | png_bytep sp = row + (png_size_t)((row_width - 1) >> 1); |
1316 | png_bytep dp = row + (png_size_t)row_width - 1; | |
1317 | png_uint_32 shift = (int)((1 - ((row_width + 1) & 1)) << 2); | |
1318 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
1319 | { |
1320 | *dp = (png_byte)((*sp >> shift) & 0xf); | |
1321 | if (shift == 4) | |
1322 | { | |
1323 | shift = 0; | |
1324 | sp--; | |
1325 | } | |
1326 | else | |
1327 | shift = 4; | |
1328 | ||
1329 | dp--; | |
1330 | } | |
1331 | break; | |
1332 | } | |
1333 | } | |
1334 | row_info->bit_depth = 8; | |
1335 | row_info->pixel_depth = (png_byte)(8 * row_info->channels); | |
a626cc03 | 1336 | row_info->rowbytes = row_width * row_info->channels; |
c801d85f KB |
1337 | } |
1338 | } | |
1339 | #endif | |
1340 | ||
1341 | #if defined(PNG_READ_SHIFT_SUPPORTED) | |
1342 | /* Reverse the effects of png_do_shift. This routine merely shifts the | |
1343 | * pixels back to their significant bits values. Thus, if you have | |
1344 | * a row of bit depth 8, but only 5 are significant, this will shift | |
1345 | * the values back to 0 through 31. | |
1346 | */ | |
1347 | void | |
1348 | png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits) | |
1349 | { | |
1350 | png_debug(1, "in png_do_unshift\n"); | |
1351 | if ( | |
1352 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
1353 | row != NULL && row_info != NULL && sig_bits != NULL && | |
1354 | #endif | |
1355 | row_info->color_type != PNG_COLOR_TYPE_PALETTE) | |
1356 | { | |
1357 | int shift[4]; | |
a626cc03 RR |
1358 | int channels = 0; |
1359 | int c; | |
1360 | png_uint_16 value = 0; | |
1361 | png_uint_32 row_width = row_info->width; | |
c801d85f | 1362 | |
c801d85f KB |
1363 | if (row_info->color_type & PNG_COLOR_MASK_COLOR) |
1364 | { | |
1365 | shift[channels++] = row_info->bit_depth - sig_bits->red; | |
1366 | shift[channels++] = row_info->bit_depth - sig_bits->green; | |
1367 | shift[channels++] = row_info->bit_depth - sig_bits->blue; | |
1368 | } | |
1369 | else | |
1370 | { | |
1371 | shift[channels++] = row_info->bit_depth - sig_bits->gray; | |
1372 | } | |
1373 | if (row_info->color_type & PNG_COLOR_MASK_ALPHA) | |
1374 | { | |
1375 | shift[channels++] = row_info->bit_depth - sig_bits->alpha; | |
1376 | } | |
1377 | ||
c801d85f KB |
1378 | for (c = 0; c < channels; c++) |
1379 | { | |
1380 | if (shift[c] <= 0) | |
1381 | shift[c] = 0; | |
1382 | else | |
1383 | value = 1; | |
1384 | } | |
1385 | ||
1386 | if (!value) | |
1387 | return; | |
1388 | ||
1389 | switch (row_info->bit_depth) | |
1390 | { | |
1391 | case 2: | |
1392 | { | |
1393 | png_bytep bp; | |
1394 | png_uint_32 i; | |
a626cc03 | 1395 | png_uint_32 istop = row_info->rowbytes; |
c801d85f | 1396 | |
a626cc03 | 1397 | for (bp = row, i = 0; i < istop; i++) |
c801d85f KB |
1398 | { |
1399 | *bp >>= 1; | |
a626cc03 | 1400 | *bp++ &= 0x55; |
c801d85f KB |
1401 | } |
1402 | break; | |
1403 | } | |
1404 | case 4: | |
1405 | { | |
a626cc03 | 1406 | png_bytep bp = row; |
c801d85f | 1407 | png_uint_32 i; |
a626cc03 RR |
1408 | png_uint_32 istop = row_info->rowbytes; |
1409 | png_byte mask = (png_byte)(((int)0xf0 >> shift[0]) & (int)0xf0) | | |
c801d85f | 1410 | (png_byte)((int)0xf >> shift[0]); |
a626cc03 RR |
1411 | |
1412 | for (i = 0; i < istop; i++) | |
c801d85f KB |
1413 | { |
1414 | *bp >>= shift[0]; | |
a626cc03 | 1415 | *bp++ &= mask; |
c801d85f KB |
1416 | } |
1417 | break; | |
1418 | } | |
1419 | case 8: | |
1420 | { | |
a626cc03 | 1421 | png_bytep bp = row; |
c801d85f | 1422 | png_uint_32 i; |
a626cc03 | 1423 | png_uint_32 istop = row_width * channels; |
c801d85f | 1424 | |
a626cc03 | 1425 | for (i = 0; i < istop; i++) |
c801d85f | 1426 | { |
a626cc03 | 1427 | *bp++ >>= shift[i%channels]; |
c801d85f KB |
1428 | } |
1429 | break; | |
1430 | } | |
1431 | case 16: | |
1432 | { | |
a626cc03 RR |
1433 | png_bytep bp = row; |
1434 | png_uint_32 i; | |
1435 | png_uint_32 istop = channels * row_width; | |
c801d85f | 1436 | |
a626cc03 | 1437 | for (i = 0; i < istop; i++) |
c801d85f | 1438 | { |
a626cc03 RR |
1439 | value = (png_uint_16)((*bp << 8) + *(bp + 1)); |
1440 | value >>= shift[i%channels]; | |
1441 | *bp++ = (png_byte)(value >> 8); | |
1442 | *bp++ = (png_byte)(value & 0xff); | |
c801d85f KB |
1443 | } |
1444 | break; | |
1445 | } | |
1446 | } | |
1447 | } | |
1448 | } | |
1449 | #endif | |
1450 | ||
1451 | #if defined(PNG_READ_16_TO_8_SUPPORTED) | |
1452 | /* chop rows of bit depth 16 down to 8 */ | |
1453 | void | |
1454 | png_do_chop(png_row_infop row_info, png_bytep row) | |
1455 | { | |
1456 | png_debug(1, "in png_do_chop\n"); | |
1457 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
1458 | if (row != NULL && row_info != NULL && row_info->bit_depth == 16) | |
1459 | #else | |
1460 | if (row_info->bit_depth == 16) | |
1461 | #endif | |
1462 | { | |
a626cc03 RR |
1463 | png_bytep sp = row; |
1464 | png_bytep dp = row; | |
c801d85f | 1465 | png_uint_32 i; |
a626cc03 | 1466 | png_uint_32 istop = row_info->width * row_info->channels; |
c801d85f | 1467 | |
a626cc03 | 1468 | for (i = 0; i<istop; i++, sp += 2, dp++) |
c801d85f KB |
1469 | { |
1470 | #if defined(PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED) | |
a626cc03 RR |
1471 | /* This does a more accurate scaling of the 16-bit color |
1472 | * value, rather than a simple low-byte truncation. | |
1473 | * | |
1474 | * What the ideal calculation should be: | |
1475 | * *dp = (((((png_uint_32)(*sp) << 8) | | |
1476 | * (png_uint_32)(*(sp + 1))) * 255 + 127) / (png_uint_32)65535L; | |
1477 | * | |
1478 | * GRR: no, I think this is what it really should be: | |
1479 | * *dp = (((((png_uint_32)(*sp) << 8) | | |
1480 | * (png_uint_32)(*(sp + 1))) + 128L) / (png_uint_32)257L; | |
1481 | * | |
1482 | * GRR: here's the exact calculation with shifts: | |
1483 | * temp = (((png_uint_32)(*sp) << 8) | (png_uint_32)(*(sp + 1))) + 128L; | |
1484 | * *dp = (temp - (temp >> 8)) >> 8; | |
1485 | * | |
1486 | * Approximate calculation with shift/add instead of multiply/divide: | |
1487 | * *dp = ((((png_uint_32)(*sp) << 8) | | |
1488 | * (png_uint_32)((int)(*(sp + 1)) - *sp)) + 128) >> 8; | |
1489 | * | |
1490 | * What we actually do to avoid extra shifting and conversion: | |
1491 | */ | |
c801d85f | 1492 | |
c801d85f KB |
1493 | *dp = *sp + ((((int)(*(sp + 1)) - *sp) > 128) ? 1 : 0); |
1494 | #else | |
a626cc03 | 1495 | /* Simply discard the low order byte */ |
c801d85f KB |
1496 | *dp = *sp; |
1497 | #endif | |
1498 | } | |
1499 | row_info->bit_depth = 8; | |
1500 | row_info->pixel_depth = (png_byte)(8 * row_info->channels); | |
1501 | row_info->rowbytes = row_info->width * row_info->channels; | |
1502 | } | |
1503 | } | |
1504 | #endif | |
1505 | ||
1506 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) | |
1507 | void | |
1508 | png_do_read_swap_alpha(png_row_infop row_info, png_bytep row) | |
1509 | { | |
1510 | png_debug(1, "in png_do_read_swap_alpha\n"); | |
1511 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
1512 | if (row != NULL && row_info != NULL) | |
1513 | #endif | |
1514 | { | |
a626cc03 | 1515 | png_uint_32 row_width = row_info->width; |
c801d85f KB |
1516 | if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
1517 | { | |
1518 | /* This converts from RGBA to ARGB */ | |
1519 | if (row_info->bit_depth == 8) | |
1520 | { | |
a626cc03 RR |
1521 | png_bytep sp = row + row_info->rowbytes; |
1522 | png_bytep dp = sp; | |
c801d85f KB |
1523 | png_byte save; |
1524 | png_uint_32 i; | |
1525 | ||
a626cc03 | 1526 | for (i = 0; i < row_width; i++) |
c801d85f KB |
1527 | { |
1528 | save = *(--sp); | |
1529 | *(--dp) = *(--sp); | |
1530 | *(--dp) = *(--sp); | |
1531 | *(--dp) = *(--sp); | |
1532 | *(--dp) = save; | |
1533 | } | |
1534 | } | |
1535 | /* This converts from RRGGBBAA to AARRGGBB */ | |
1536 | else | |
1537 | { | |
a626cc03 RR |
1538 | png_bytep sp = row + row_info->rowbytes; |
1539 | png_bytep dp = sp; | |
c801d85f KB |
1540 | png_byte save[2]; |
1541 | png_uint_32 i; | |
1542 | ||
a626cc03 | 1543 | for (i = 0; i < row_width; i++) |
c801d85f KB |
1544 | { |
1545 | save[0] = *(--sp); | |
1546 | save[1] = *(--sp); | |
1547 | *(--dp) = *(--sp); | |
1548 | *(--dp) = *(--sp); | |
1549 | *(--dp) = *(--sp); | |
1550 | *(--dp) = *(--sp); | |
1551 | *(--dp) = *(--sp); | |
1552 | *(--dp) = *(--sp); | |
1553 | *(--dp) = save[0]; | |
1554 | *(--dp) = save[1]; | |
1555 | } | |
1556 | } | |
1557 | } | |
1558 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) | |
1559 | { | |
1560 | /* This converts from GA to AG */ | |
1561 | if (row_info->bit_depth == 8) | |
1562 | { | |
a626cc03 RR |
1563 | png_bytep sp = row + row_info->rowbytes; |
1564 | png_bytep dp = sp; | |
c801d85f KB |
1565 | png_byte save; |
1566 | png_uint_32 i; | |
1567 | ||
a626cc03 | 1568 | for (i = 0; i < row_width; i++) |
c801d85f KB |
1569 | { |
1570 | save = *(--sp); | |
1571 | *(--dp) = *(--sp); | |
1572 | *(--dp) = save; | |
1573 | } | |
1574 | } | |
1575 | /* This converts from GGAA to AAGG */ | |
1576 | else | |
1577 | { | |
a626cc03 RR |
1578 | png_bytep sp = row + row_info->rowbytes; |
1579 | png_bytep dp = sp; | |
c801d85f KB |
1580 | png_byte save[2]; |
1581 | png_uint_32 i; | |
1582 | ||
a626cc03 | 1583 | for (i = 0; i < row_width; i++) |
c801d85f KB |
1584 | { |
1585 | save[0] = *(--sp); | |
1586 | save[1] = *(--sp); | |
1587 | *(--dp) = *(--sp); | |
1588 | *(--dp) = *(--sp); | |
1589 | *(--dp) = save[0]; | |
1590 | *(--dp) = save[1]; | |
1591 | } | |
1592 | } | |
1593 | } | |
1594 | } | |
1595 | } | |
1596 | #endif | |
1597 | ||
1598 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) | |
1599 | void | |
1600 | png_do_read_invert_alpha(png_row_infop row_info, png_bytep row) | |
1601 | { | |
1602 | png_debug(1, "in png_do_read_invert_alpha\n"); | |
1603 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
1604 | if (row != NULL && row_info != NULL) | |
1605 | #endif | |
1606 | { | |
a626cc03 | 1607 | png_uint_32 row_width = row_info->width; |
c801d85f KB |
1608 | if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) |
1609 | { | |
1610 | /* This inverts the alpha channel in RGBA */ | |
1611 | if (row_info->bit_depth == 8) | |
1612 | { | |
a626cc03 RR |
1613 | png_bytep sp = row + row_info->rowbytes; |
1614 | png_bytep dp = sp; | |
c801d85f KB |
1615 | png_uint_32 i; |
1616 | ||
a626cc03 | 1617 | for (i = 0; i < row_width; i++) |
c801d85f KB |
1618 | { |
1619 | *(--dp) = 255 - *(--sp); | |
1620 | *(--dp) = *(--sp); | |
1621 | *(--dp) = *(--sp); | |
1622 | *(--dp) = *(--sp); | |
1623 | } | |
1624 | } | |
1625 | /* This inverts the alpha channel in RRGGBBAA */ | |
1626 | else | |
1627 | { | |
a626cc03 RR |
1628 | png_bytep sp = row + row_info->rowbytes; |
1629 | png_bytep dp = sp; | |
c801d85f KB |
1630 | png_uint_32 i; |
1631 | ||
a626cc03 | 1632 | for (i = 0; i < row_width; i++) |
c801d85f KB |
1633 | { |
1634 | *(--dp) = 255 - *(--sp); | |
1635 | *(--dp) = 255 - *(--sp); | |
1636 | *(--dp) = *(--sp); | |
1637 | *(--dp) = *(--sp); | |
1638 | *(--dp) = *(--sp); | |
1639 | *(--dp) = *(--sp); | |
1640 | *(--dp) = *(--sp); | |
1641 | *(--dp) = *(--sp); | |
1642 | } | |
1643 | } | |
1644 | } | |
1645 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) | |
1646 | { | |
1647 | /* This inverts the alpha channel in GA */ | |
1648 | if (row_info->bit_depth == 8) | |
1649 | { | |
a626cc03 RR |
1650 | png_bytep sp = row + row_info->rowbytes; |
1651 | png_bytep dp = sp; | |
c801d85f KB |
1652 | png_uint_32 i; |
1653 | ||
a626cc03 | 1654 | for (i = 0; i < row_width; i++) |
c801d85f KB |
1655 | { |
1656 | *(--dp) = 255 - *(--sp); | |
1657 | *(--dp) = *(--sp); | |
1658 | } | |
1659 | } | |
1660 | /* This inverts the alpha channel in GGAA */ | |
1661 | else | |
1662 | { | |
a626cc03 RR |
1663 | png_bytep sp = row + row_info->rowbytes; |
1664 | png_bytep dp = sp; | |
c801d85f KB |
1665 | png_uint_32 i; |
1666 | ||
a626cc03 | 1667 | for (i = 0; i < row_width; i++) |
c801d85f KB |
1668 | { |
1669 | *(--dp) = 255 - *(--sp); | |
1670 | *(--dp) = 255 - *(--sp); | |
1671 | *(--dp) = *(--sp); | |
1672 | *(--dp) = *(--sp); | |
1673 | } | |
1674 | } | |
1675 | } | |
1676 | } | |
1677 | } | |
1678 | #endif | |
1679 | ||
1680 | #if defined(PNG_READ_FILLER_SUPPORTED) | |
1681 | /* Add filler channel if we have RGB color */ | |
1682 | void | |
1683 | png_do_read_filler(png_row_infop row_info, png_bytep row, | |
1684 | png_uint_32 filler, png_uint_32 flags) | |
1685 | { | |
c801d85f | 1686 | png_uint_32 i; |
a626cc03 RR |
1687 | png_uint_32 row_width = row_info->width; |
1688 | ||
1689 | png_byte hi_filler = (png_byte)((filler>>8) & 0xff); | |
1690 | png_byte lo_filler = (png_byte)(filler & 0xff); | |
c801d85f KB |
1691 | |
1692 | png_debug(1, "in png_do_read_filler\n"); | |
1693 | if ( | |
1694 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
1695 | row != NULL && row_info != NULL && | |
1696 | #endif | |
a626cc03 | 1697 | row_info->color_type == PNG_COLOR_TYPE_GRAY) |
c801d85f | 1698 | { |
a626cc03 | 1699 | if(row_info->bit_depth == 8) |
c801d85f | 1700 | { |
a626cc03 RR |
1701 | /* This changes the data from G to GX */ |
1702 | if (flags & PNG_FLAG_FILLER_AFTER) | |
c801d85f | 1703 | { |
a626cc03 RR |
1704 | png_bytep sp = row + (png_size_t)row_width; |
1705 | png_bytep dp = sp + (png_size_t)row_width; | |
1706 | for (i = 1; i < row_width; i++) | |
1707 | { | |
1708 | *(--dp) = lo_filler; | |
1709 | *(--dp) = *(--sp); | |
1710 | } | |
1711 | *(--dp) = lo_filler; | |
1712 | row_info->channels = 2; | |
1713 | row_info->pixel_depth = 16; | |
1714 | row_info->rowbytes = row_width * 2; | |
1715 | } | |
1716 | /* This changes the data from G to XG */ | |
1717 | else | |
1718 | { | |
1719 | png_bytep sp = row + (png_size_t)row_width; | |
1720 | png_bytep dp = sp + (png_size_t)row_width; | |
1721 | for (i = 0; i < row_width; i++) | |
1722 | { | |
1723 | *(--dp) = *(--sp); | |
1724 | *(--dp) = lo_filler; | |
1725 | } | |
1726 | row_info->channels = 2; | |
1727 | row_info->pixel_depth = 16; | |
1728 | row_info->rowbytes = row_width * 2; | |
c801d85f | 1729 | } |
c801d85f | 1730 | } |
a626cc03 RR |
1731 | else if(row_info->bit_depth == 16) |
1732 | { | |
1733 | /* This changes the data from GG to GGXX */ | |
1734 | if (flags & PNG_FLAG_FILLER_AFTER) | |
1735 | { | |
1736 | png_bytep sp = row + (png_size_t)row_width; | |
1737 | png_bytep dp = sp + (png_size_t)row_width; | |
1738 | for (i = 1; i < row_width; i++) | |
1739 | { | |
1740 | *(--dp) = hi_filler; | |
1741 | *(--dp) = lo_filler; | |
1742 | *(--dp) = *(--sp); | |
1743 | *(--dp) = *(--sp); | |
1744 | } | |
1745 | *(--dp) = hi_filler; | |
1746 | *(--dp) = lo_filler; | |
1747 | row_info->channels = 2; | |
1748 | row_info->pixel_depth = 32; | |
1749 | row_info->rowbytes = row_width * 2; | |
1750 | } | |
1751 | /* This changes the data from GG to XXGG */ | |
1752 | else | |
1753 | { | |
1754 | png_bytep sp = row + (png_size_t)row_width; | |
1755 | png_bytep dp = sp + (png_size_t)row_width; | |
1756 | for (i = 0; i < row_width; i++) | |
1757 | { | |
1758 | *(--dp) = *(--sp); | |
1759 | *(--dp) = *(--sp); | |
1760 | *(--dp) = hi_filler; | |
1761 | *(--dp) = lo_filler; | |
1762 | } | |
1763 | row_info->channels = 2; | |
1764 | row_info->pixel_depth = 16; | |
1765 | row_info->rowbytes = row_width * 2; | |
1766 | } | |
1767 | } | |
1768 | } /* COLOR_TYPE == GRAY */ | |
1769 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB) | |
1770 | { | |
1771 | if(row_info->bit_depth == 8) | |
1772 | { | |
1773 | /* This changes the data from RGB to RGBX */ | |
1774 | if (flags & PNG_FLAG_FILLER_AFTER) | |
1775 | { | |
1776 | png_bytep sp = row + (png_size_t)row_width * 3; | |
1777 | png_bytep dp = sp + (png_size_t)row_width; | |
1778 | for (i = 1; i < row_width; i++) | |
1779 | { | |
1780 | *(--dp) = lo_filler; | |
1781 | *(--dp) = *(--sp); | |
1782 | *(--dp) = *(--sp); | |
1783 | *(--dp) = *(--sp); | |
1784 | } | |
1785 | *(--dp) = lo_filler; | |
1786 | row_info->channels = 4; | |
1787 | row_info->pixel_depth = 32; | |
1788 | row_info->rowbytes = row_width * 4; | |
1789 | } | |
c801d85f | 1790 | /* This changes the data from RGB to XRGB */ |
a626cc03 RR |
1791 | else |
1792 | { | |
1793 | png_bytep sp = row + (png_size_t)row_width * 3; | |
1794 | png_bytep dp = sp + (png_size_t)row_width; | |
1795 | for (i = 0; i < row_width; i++) | |
1796 | { | |
1797 | *(--dp) = *(--sp); | |
1798 | *(--dp) = *(--sp); | |
1799 | *(--dp) = *(--sp); | |
1800 | *(--dp) = lo_filler; | |
1801 | } | |
1802 | row_info->channels = 4; | |
1803 | row_info->pixel_depth = 32; | |
1804 | row_info->rowbytes = row_width * 4; | |
1805 | } | |
1806 | } | |
1807 | else if(row_info->bit_depth == 16) | |
c801d85f | 1808 | { |
a626cc03 RR |
1809 | /* This changes the data from RRGGBB to RRGGBBXX */ |
1810 | if (flags & PNG_FLAG_FILLER_AFTER) | |
c801d85f | 1811 | { |
a626cc03 RR |
1812 | png_bytep sp = row + (png_size_t)row_width * 3; |
1813 | png_bytep dp = sp + (png_size_t)row_width; | |
1814 | for (i = 1; i < row_width; i++) | |
1815 | { | |
1816 | *(--dp) = hi_filler; | |
1817 | *(--dp) = lo_filler; | |
1818 | *(--dp) = *(--sp); | |
1819 | *(--dp) = *(--sp); | |
1820 | *(--dp) = *(--sp); | |
1821 | *(--dp) = *(--sp); | |
1822 | *(--dp) = *(--sp); | |
1823 | *(--dp) = *(--sp); | |
1824 | } | |
1825 | *(--dp) = hi_filler; | |
1826 | *(--dp) = lo_filler; | |
1827 | row_info->channels = 4; | |
1828 | row_info->pixel_depth = 64; | |
1829 | row_info->rowbytes = row_width * 4; | |
1830 | } | |
1831 | /* This changes the data from RRGGBB to XXRRGGBB */ | |
1832 | else | |
1833 | { | |
1834 | png_bytep sp = row + (png_size_t)row_width * 3; | |
1835 | png_bytep dp = sp + (png_size_t)row_width; | |
1836 | for (i = 0; i < row_width; i++) | |
1837 | { | |
1838 | *(--dp) = *(--sp); | |
1839 | *(--dp) = *(--sp); | |
1840 | *(--dp) = *(--sp); | |
1841 | *(--dp) = *(--sp); | |
1842 | *(--dp) = *(--sp); | |
1843 | *(--dp) = *(--sp); | |
1844 | *(--dp) = hi_filler; | |
1845 | *(--dp) = lo_filler; | |
1846 | } | |
1847 | row_info->channels = 4; | |
1848 | row_info->pixel_depth = 64; | |
1849 | row_info->rowbytes = row_width * 4; | |
c801d85f | 1850 | } |
c801d85f | 1851 | } |
a626cc03 | 1852 | } /* COLOR_TYPE == RGB */ |
c801d85f KB |
1853 | } |
1854 | #endif | |
1855 | ||
1856 | #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) | |
1857 | /* expand grayscale files to RGB, with or without alpha */ | |
1858 | void | |
1859 | png_do_gray_to_rgb(png_row_infop row_info, png_bytep row) | |
1860 | { | |
c801d85f | 1861 | png_uint_32 i; |
a626cc03 | 1862 | png_uint_32 row_width = row_info->width; |
c801d85f KB |
1863 | |
1864 | png_debug(1, "in png_do_gray_to_rgb\n"); | |
1865 | if (row_info->bit_depth >= 8 && | |
1866 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
1867 | row != NULL && row_info != NULL && | |
1868 | #endif | |
1869 | !(row_info->color_type & PNG_COLOR_MASK_COLOR)) | |
1870 | { | |
1871 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY) | |
1872 | { | |
1873 | if (row_info->bit_depth == 8) | |
1874 | { | |
a626cc03 RR |
1875 | png_bytep sp = row + (png_size_t)row_width - 1; |
1876 | png_bytep dp = sp + (png_size_t)row_width * 2; | |
1877 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
1878 | { |
1879 | *(dp--) = *sp; | |
1880 | *(dp--) = *sp; | |
1881 | *(dp--) = *sp; | |
1882 | sp--; | |
1883 | } | |
1884 | } | |
1885 | else | |
1886 | { | |
a626cc03 RR |
1887 | png_bytep sp = row + (png_size_t)row_width * 2 - 1; |
1888 | png_bytep dp = sp + (png_size_t)row_width * 4; | |
1889 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
1890 | { |
1891 | *(dp--) = *sp; | |
1892 | *(dp--) = *(sp - 1); | |
1893 | *(dp--) = *sp; | |
1894 | *(dp--) = *(sp - 1); | |
1895 | *(dp--) = *sp; | |
1896 | *(dp--) = *(sp - 1); | |
1897 | sp--; | |
1898 | sp--; | |
1899 | } | |
1900 | } | |
1901 | } | |
1902 | else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) | |
1903 | { | |
1904 | if (row_info->bit_depth == 8) | |
1905 | { | |
a626cc03 RR |
1906 | png_bytep sp = row + (png_size_t)row_width * 2 - 1; |
1907 | png_bytep dp = sp + (png_size_t)row_width * 2; | |
1908 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
1909 | { |
1910 | *(dp--) = *(sp--); | |
1911 | *(dp--) = *sp; | |
1912 | *(dp--) = *sp; | |
1913 | *(dp--) = *sp; | |
1914 | sp--; | |
1915 | } | |
1916 | } | |
1917 | else | |
1918 | { | |
a626cc03 RR |
1919 | png_bytep sp = row + (png_size_t)row_width * 4 - 1; |
1920 | png_bytep dp = sp + (png_size_t)row_width * 4; | |
1921 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
1922 | { |
1923 | *(dp--) = *(sp--); | |
1924 | *(dp--) = *(sp--); | |
1925 | *(dp--) = *sp; | |
1926 | *(dp--) = *(sp - 1); | |
1927 | *(dp--) = *sp; | |
1928 | *(dp--) = *(sp - 1); | |
1929 | *(dp--) = *sp; | |
1930 | *(dp--) = *(sp - 1); | |
1931 | sp--; | |
1932 | sp--; | |
1933 | } | |
1934 | } | |
1935 | } | |
1936 | row_info->channels += (png_byte)2; | |
1937 | row_info->color_type |= PNG_COLOR_MASK_COLOR; | |
1938 | row_info->pixel_depth = (png_byte)(row_info->channels * | |
1939 | row_info->bit_depth); | |
a626cc03 | 1940 | row_info->rowbytes = ((row_width * |
c801d85f KB |
1941 | row_info->pixel_depth + 7) >> 3); |
1942 | } | |
1943 | } | |
1944 | #endif | |
1945 | ||
a626cc03 RR |
1946 | #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
1947 | /* reduce RGB files to grayscale, with or without alpha | |
1948 | * using the equation given in Poynton's ColorFAQ at | |
1949 | * <http://www.inforamp.net/~poynton/> | |
1950 | * Copyright (c) 1998-01-04 Charles Poynton poynton@inforamp.net | |
1951 | * | |
1952 | * Y = 0.212671 * R + 0.715160 * G + 0.072169 * B | |
1953 | * | |
1954 | * We approximate this with | |
1955 | * | |
1956 | * Y = 0.211 * R + 0.715 * G + 0.074 * B | |
1957 | * | |
1958 | * which can be expressed with integers as | |
1959 | * | |
1960 | * Y = (54 * R + 183 * G + 19 * B)/256 | |
1961 | * | |
1962 | * The calculation is to be done in a linear colorspace. | |
1963 | * | |
1964 | * Other integer coefficents can be used via png_set_rgb_to_gray(). | |
1965 | */ | |
1966 | int | |
1967 | png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) | |
1968 | ||
1969 | { | |
1970 | png_uint_32 i; | |
1971 | ||
1972 | png_uint_32 row_width = row_info->width; | |
1973 | int rgb_error = 0; | |
1974 | ||
1975 | png_debug(1, "in png_do_rgb_to_gray\n"); | |
1976 | if ( | |
1977 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
1978 | row != NULL && row_info != NULL && | |
1979 | #endif | |
1980 | (row_info->color_type & PNG_COLOR_MASK_COLOR)) | |
1981 | { | |
1982 | png_byte rc = png_ptr->rgb_to_gray_red_coeff; | |
1983 | png_byte gc = png_ptr->rgb_to_gray_green_coeff; | |
1984 | png_byte bc = png_ptr->rgb_to_gray_blue_coeff; | |
1985 | ||
1986 | if (row_info->color_type == PNG_COLOR_TYPE_RGB) | |
1987 | { | |
1988 | if (row_info->bit_depth == 8) | |
1989 | { | |
1990 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) | |
1991 | if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL) | |
1992 | { | |
1993 | png_bytep sp = row; | |
1994 | png_bytep dp = row; | |
1995 | ||
1996 | for (i = 0; i < row_width; i++) | |
1997 | { | |
1998 | png_byte red = png_ptr->gamma_to_1[*(sp++)]; | |
1999 | png_byte green = png_ptr->gamma_to_1[*(sp++)]; | |
2000 | png_byte blue = png_ptr->gamma_to_1[*(sp++)]; | |
2001 | if(red != green || red != blue) | |
2002 | { | |
2003 | rgb_error |= 1; | |
2004 | *(dp++) = png_ptr->gamma_from_1[ | |
2005 | (rc*red+gc*green+bc*blue)>>8]; | |
2006 | } | |
2007 | else | |
2008 | *(dp++) = *(sp-1); | |
2009 | } | |
2010 | } | |
2011 | else | |
2012 | #endif | |
2013 | { | |
2014 | png_bytep sp = row; | |
2015 | png_bytep dp = row; | |
2016 | for (i = 0; i < row_width; i++) | |
2017 | { | |
2018 | png_byte red = *(sp++); | |
2019 | png_byte green = *(sp++); | |
2020 | png_byte blue = *(sp++); | |
2021 | if(red != green || red != blue) | |
2022 | { | |
2023 | rgb_error |= 1; | |
2024 | *(dp++) = (rc*red+gc*green+bc*blue)>>8; | |
2025 | } | |
2026 | else | |
2027 | *(dp++) = *(sp-1); | |
2028 | } | |
2029 | } | |
2030 | } | |
2031 | ||
2032 | else /* RGB bit_depth == 16 */ | |
2033 | { | |
2034 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) | |
2035 | if (png_ptr->gamma_16_to_1 != NULL && | |
2036 | png_ptr->gamma_16_from_1 != NULL) | |
2037 | { | |
2038 | png_bytep sp = row; | |
2039 | png_bytep dp = row; | |
2040 | for (i = 0; i < row_width; i++) | |
2041 | { | |
2042 | png_uint_16 red, green, blue, w; | |
2043 | ||
2044 | red = ((*(sp))<<8) | *(sp+1); sp+=2; | |
2045 | green = ((*(sp))<<8) | *(sp+1); sp+=2; | |
2046 | blue = ((*(sp))<<8) | *(sp+1); sp+=2; | |
2047 | ||
2048 | if(red == green && red == blue) | |
2049 | w = red; | |
2050 | else | |
2051 | { | |
2052 | png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red&0xff) >> | |
2053 | png_ptr->gamma_shift][red>>8]; | |
2054 | png_uint_16 green_1 = png_ptr->gamma_16_to_1[(green&0xff) >> | |
2055 | png_ptr->gamma_shift][green>>8]; | |
2056 | png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >> | |
2057 | png_ptr->gamma_shift][blue>>8]; | |
2058 | png_uint_16 gray16 = (rc * red_1 + gc * green_1 | |
2059 | + bc * blue_1)>>8; | |
2060 | w = png_ptr->gamma_16_from_1[(gray16&0xff) >> | |
2061 | png_ptr->gamma_shift][gray16 >> 8]; | |
2062 | rgb_error |= 1; | |
2063 | } | |
2064 | ||
2065 | *(dp++) = (w>>8) & 0xff; | |
2066 | *(dp++) = w & 0xff; | |
2067 | } | |
2068 | } | |
2069 | else | |
2070 | #endif | |
2071 | { | |
2072 | png_bytep sp = row; | |
2073 | png_bytep dp = row; | |
2074 | for (i = 0; i < row_width; i++) | |
2075 | { | |
2076 | png_uint_16 red, green, blue, gray16; | |
2077 | ||
2078 | red = ((*(sp))<<8) | *(sp+1); sp+=2; | |
2079 | green = ((*(sp))<<8) | *(sp+1); sp+=2; | |
2080 | blue = ((*(sp))<<8) | *(sp+1); sp+=2; | |
2081 | ||
2082 | if(red != green || red != blue) | |
2083 | rgb_error |= 1; | |
2084 | gray16 = (rc * red + gc * green + bc * blue)>>8; | |
2085 | *(dp++) = (gray16>>8) & 0xff; | |
2086 | *(dp++) = gray16 & 0xff; | |
2087 | } | |
2088 | } | |
2089 | } | |
2090 | } | |
2091 | if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) | |
2092 | { | |
2093 | if (row_info->bit_depth == 8) | |
2094 | { | |
2095 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) | |
2096 | if (png_ptr->gamma_from_1 != NULL && png_ptr->gamma_to_1 != NULL) | |
2097 | { | |
2098 | png_bytep sp = row; | |
2099 | png_bytep dp = row; | |
2100 | for (i = 0; i < row_width; i++) | |
2101 | { | |
2102 | png_byte red = png_ptr->gamma_to_1[*(sp++)]; | |
2103 | png_byte green = png_ptr->gamma_to_1[*(sp++)]; | |
2104 | png_byte blue = png_ptr->gamma_to_1[*(sp++)]; | |
2105 | if(red != green || red != blue) | |
2106 | rgb_error |= 1; | |
2107 | *(dp++) = png_ptr->gamma_from_1 | |
2108 | [(rc*red + gc*green + bc*blue)>>8]; | |
2109 | *(dp++) = *(sp++); /* alpha */ | |
2110 | } | |
2111 | } | |
2112 | else | |
2113 | #endif | |
2114 | { | |
2115 | png_bytep sp = row; | |
2116 | png_bytep dp = row; | |
2117 | for (i = 0; i < row_width; i++) | |
2118 | { | |
2119 | png_byte red = *(sp++); | |
2120 | png_byte green = *(sp++); | |
2121 | png_byte blue = *(sp++); | |
2122 | if(red != green || red != blue) | |
2123 | rgb_error |= 1; | |
2124 | *(dp++) = (gc*red + gc*green + bc*blue)>>8; | |
2125 | *(dp++) = *(sp++); /* alpha */ | |
2126 | } | |
2127 | } | |
2128 | } | |
2129 | else /* RGBA bit_depth == 16 */ | |
2130 | { | |
2131 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) | |
2132 | if (png_ptr->gamma_16_to_1 != NULL && | |
2133 | png_ptr->gamma_16_from_1 != NULL) | |
2134 | { | |
2135 | png_bytep sp = row; | |
2136 | png_bytep dp = row; | |
2137 | for (i = 0; i < row_width; i++) | |
2138 | { | |
2139 | png_uint_16 red, green, blue, w; | |
2140 | ||
2141 | red = ((*(sp))<<8) | *(sp+1); sp+=2; | |
2142 | green = ((*(sp))<<8) | *(sp+1); sp+=2; | |
2143 | blue = ((*(sp))<<8) | *(sp+1); sp+=2; | |
2144 | ||
2145 | if(red == green && red == blue) | |
2146 | w = red; | |
2147 | else | |
2148 | { | |
2149 | png_uint_16 red_1 = png_ptr->gamma_16_to_1[(red&0xff) >> | |
2150 | png_ptr->gamma_shift][red>>8]; | |
2151 | png_uint_16 green_1 = png_ptr->gamma_16_to_1[(green&0xff) >> | |
2152 | png_ptr->gamma_shift][green>>8]; | |
2153 | png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >> | |
2154 | png_ptr->gamma_shift][blue>>8]; | |
2155 | png_uint_16 gray16 = (rc * red_1 + gc * green_1 | |
2156 | + bc * blue_1)>>8; | |
2157 | w = png_ptr->gamma_16_from_1[(gray16&0xff) >> | |
2158 | png_ptr->gamma_shift][gray16 >> 8]; | |
2159 | rgb_error |= 1; | |
2160 | } | |
2161 | ||
2162 | *(dp++) = (w>>8) & 0xff; | |
2163 | *(dp++) = w & 0xff; | |
2164 | *(dp++) = *(sp++); /* alpha */ | |
2165 | *(dp++) = *(sp++); | |
2166 | } | |
2167 | } | |
2168 | else | |
2169 | #endif | |
2170 | { | |
2171 | png_bytep sp = row; | |
2172 | png_bytep dp = row; | |
2173 | for (i = 0; i < row_width; i++) | |
2174 | { | |
2175 | png_uint_16 red, green, blue, gray16; | |
2176 | red = (*(sp)<<8) | *(sp+1); sp+=2; | |
2177 | green = (*(sp)<<8) | *(sp+1); sp+=2; | |
2178 | blue = (*(sp)<<8) | *(sp+1); sp+=2; | |
2179 | if(red != green || red != blue) | |
2180 | rgb_error |= 1; | |
2181 | gray16 = (rc * red + gc * green + bc * blue)>>8; | |
2182 | *(dp++) = (gray16>>8) & 0xff; | |
2183 | *(dp++) = gray16 & 0xff; | |
2184 | *(dp++) = *(sp++); /* alpha */ | |
2185 | *(dp++) = *(sp++); | |
2186 | } | |
2187 | } | |
2188 | } | |
2189 | } | |
2190 | row_info->channels -= (png_byte)2; | |
2191 | row_info->color_type &= ~PNG_COLOR_MASK_COLOR; | |
2192 | row_info->pixel_depth = (png_byte)(row_info->channels * | |
2193 | row_info->bit_depth); | |
2194 | row_info->rowbytes = ((row_width * | |
2195 | row_info->pixel_depth + 7) >> 3); | |
2196 | } | |
2197 | return rgb_error; | |
2198 | } | |
2199 | #endif | |
2200 | ||
c801d85f KB |
2201 | /* Build a grayscale palette. Palette is assumed to be 1 << bit_depth |
2202 | * large of png_color. This lets grayscale images be treated as | |
2203 | * paletted. Most useful for gamma correction and simplification | |
2204 | * of code. | |
2205 | */ | |
2206 | void | |
2207 | png_build_grayscale_palette(int bit_depth, png_colorp palette) | |
2208 | { | |
2209 | int num_palette; | |
2210 | int color_inc; | |
2211 | int i; | |
2212 | int v; | |
2213 | ||
2214 | png_debug(1, "in png_do_build_grayscale_palette\n"); | |
2215 | if (palette == NULL) | |
2216 | return; | |
2217 | ||
2218 | switch (bit_depth) | |
2219 | { | |
2220 | case 1: | |
2221 | num_palette = 2; | |
2222 | color_inc = 0xff; | |
2223 | break; | |
2224 | case 2: | |
2225 | num_palette = 4; | |
2226 | color_inc = 0x55; | |
2227 | break; | |
2228 | case 4: | |
2229 | num_palette = 16; | |
2230 | color_inc = 0x11; | |
2231 | break; | |
2232 | case 8: | |
2233 | num_palette = 256; | |
2234 | color_inc = 1; | |
2235 | break; | |
2236 | default: | |
2237 | num_palette = 0; | |
2238 | color_inc = 0; | |
2239 | break; | |
2240 | } | |
2241 | ||
2242 | for (i = 0, v = 0; i < num_palette; i++, v += color_inc) | |
2243 | { | |
2244 | palette[i].red = (png_byte)v; | |
2245 | palette[i].green = (png_byte)v; | |
2246 | palette[i].blue = (png_byte)v; | |
2247 | } | |
2248 | } | |
2249 | ||
2250 | /* This function is currently unused. Do we really need it? */ | |
2251 | #if defined(PNG_READ_DITHER_SUPPORTED) && defined(PNG_CORRECT_PALETTE_SUPPORTED) | |
2252 | void | |
2253 | png_correct_palette(png_structp png_ptr, png_colorp palette, | |
2254 | int num_palette) | |
2255 | { | |
2256 | png_debug(1, "in png_correct_palette\n"); | |
2257 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED) | |
a626cc03 | 2258 | if (png_ptr->transformations & (PNG_GAMMA | PNG_BACKGROUND)) |
c801d85f KB |
2259 | { |
2260 | png_color back, back_1; | |
2261 | ||
2262 | if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE) | |
2263 | { | |
2264 | back.red = png_ptr->gamma_table[png_ptr->background.red]; | |
2265 | back.green = png_ptr->gamma_table[png_ptr->background.green]; | |
2266 | back.blue = png_ptr->gamma_table[png_ptr->background.blue]; | |
2267 | ||
2268 | back_1.red = png_ptr->gamma_to_1[png_ptr->background.red]; | |
2269 | back_1.green = png_ptr->gamma_to_1[png_ptr->background.green]; | |
2270 | back_1.blue = png_ptr->gamma_to_1[png_ptr->background.blue]; | |
2271 | } | |
2272 | else | |
2273 | { | |
2274 | double g; | |
2275 | ||
2276 | g = 1.0 / (png_ptr->background_gamma * png_ptr->screen_gamma); | |
2277 | ||
2278 | if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_SCREEN || | |
2279 | fabs(g - 1.0) < PNG_GAMMA_THRESHOLD) | |
2280 | { | |
2281 | back.red = png_ptr->background.red; | |
2282 | back.green = png_ptr->background.green; | |
2283 | back.blue = png_ptr->background.blue; | |
2284 | } | |
2285 | else | |
2286 | { | |
2287 | back.red = | |
2288 | (png_byte)(pow((double)png_ptr->background.red/255, g) * | |
2289 | 255.0 + 0.5); | |
2290 | back.green = | |
2291 | (png_byte)(pow((double)png_ptr->background.green/255, g) * | |
2292 | 255.0 + 0.5); | |
2293 | back.blue = | |
2294 | (png_byte)(pow((double)png_ptr->background.blue/255, g) * | |
2295 | 255.0 + 0.5); | |
2296 | } | |
2297 | ||
2298 | g = 1.0 / png_ptr->background_gamma; | |
2299 | ||
2300 | back_1.red = | |
2301 | (png_byte)(pow((double)png_ptr->background.red/255, g) * | |
2302 | 255.0 + 0.5); | |
2303 | back_1.green = | |
2304 | (png_byte)(pow((double)png_ptr->background.green/255, g) * | |
2305 | 255.0 + 0.5); | |
2306 | back_1.blue = | |
2307 | (png_byte)(pow((double)png_ptr->background.blue/255, g) * | |
2308 | 255.0 + 0.5); | |
2309 | } | |
2310 | ||
2311 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) | |
2312 | { | |
2313 | png_uint_32 i; | |
2314 | ||
2315 | for (i = 0; i < (png_uint_32)num_palette; i++) | |
2316 | { | |
2317 | if (i < png_ptr->num_trans && png_ptr->trans[i] == 0) | |
2318 | { | |
2319 | palette[i] = back; | |
2320 | } | |
2321 | else if (i < png_ptr->num_trans && png_ptr->trans[i] != 0xff) | |
2322 | { | |
2323 | png_byte v, w; | |
2324 | ||
2325 | v = png_ptr->gamma_to_1[png_ptr->palette[i].red]; | |
2326 | png_composite(w, v, png_ptr->trans[i], back_1.red); | |
2327 | palette[i].red = png_ptr->gamma_from_1[w]; | |
2328 | ||
2329 | v = png_ptr->gamma_to_1[png_ptr->palette[i].green]; | |
2330 | png_composite(w, v, png_ptr->trans[i], back_1.green); | |
2331 | palette[i].green = png_ptr->gamma_from_1[w]; | |
2332 | ||
2333 | v = png_ptr->gamma_to_1[png_ptr->palette[i].blue]; | |
2334 | png_composite(w, v, png_ptr->trans[i], back_1.blue); | |
2335 | palette[i].blue = png_ptr->gamma_from_1[w]; | |
2336 | } | |
2337 | else | |
2338 | { | |
2339 | palette[i].red = png_ptr->gamma_table[palette[i].red]; | |
2340 | palette[i].green = png_ptr->gamma_table[palette[i].green]; | |
2341 | palette[i].blue = png_ptr->gamma_table[palette[i].blue]; | |
2342 | } | |
2343 | } | |
2344 | } | |
2345 | else | |
2346 | { | |
2347 | int i; | |
2348 | ||
2349 | for (i = 0; i < num_palette; i++) | |
2350 | { | |
2351 | if (palette[i].red == (png_byte)png_ptr->trans_values.gray) | |
2352 | { | |
2353 | palette[i] = back; | |
2354 | } | |
2355 | else | |
2356 | { | |
2357 | palette[i].red = png_ptr->gamma_table[palette[i].red]; | |
2358 | palette[i].green = png_ptr->gamma_table[palette[i].green]; | |
2359 | palette[i].blue = png_ptr->gamma_table[palette[i].blue]; | |
2360 | } | |
2361 | } | |
2362 | } | |
2363 | } | |
2364 | else | |
2365 | #endif | |
2366 | #if defined(PNG_READ_GAMMA_SUPPORTED) | |
2367 | if (png_ptr->transformations & PNG_GAMMA) | |
2368 | { | |
2369 | int i; | |
2370 | ||
2371 | for (i = 0; i < num_palette; i++) | |
2372 | { | |
2373 | palette[i].red = png_ptr->gamma_table[palette[i].red]; | |
2374 | palette[i].green = png_ptr->gamma_table[palette[i].green]; | |
2375 | palette[i].blue = png_ptr->gamma_table[palette[i].blue]; | |
2376 | } | |
2377 | } | |
2378 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) | |
2379 | else | |
2380 | #endif | |
2381 | #endif | |
2382 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) | |
2383 | if (png_ptr->transformations & PNG_BACKGROUND) | |
2384 | { | |
2385 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) | |
2386 | { | |
2387 | png_color back; | |
2388 | ||
2389 | back.red = (png_byte)png_ptr->background.red; | |
2390 | back.green = (png_byte)png_ptr->background.green; | |
2391 | back.blue = (png_byte)png_ptr->background.blue; | |
2392 | ||
2393 | for (i = 0; i < (int)png_ptr->num_trans; i++) | |
2394 | { | |
2395 | if (png_ptr->trans[i] == 0) | |
2396 | { | |
2397 | palette[i].red = back.red; | |
2398 | palette[i].green = back.green; | |
2399 | palette[i].blue = back.blue; | |
2400 | } | |
2401 | else if (png_ptr->trans[i] != 0xff) | |
2402 | { | |
2403 | png_composite(palette[i].red, png_ptr->palette[i].red, | |
2404 | png_ptr->trans[i], back.red); | |
2405 | png_composite(palette[i].green, png_ptr->palette[i].green, | |
2406 | png_ptr->trans[i], back.green); | |
2407 | png_composite(palette[i].blue, png_ptr->palette[i].blue, | |
2408 | png_ptr->trans[i], back.blue); | |
2409 | } | |
2410 | } | |
2411 | } | |
2412 | else /* assume grayscale palette (what else could it be?) */ | |
2413 | { | |
2414 | int i; | |
2415 | ||
2416 | for (i = 0; i < num_palette; i++) | |
2417 | { | |
2418 | if (i == (png_byte)png_ptr->trans_values.gray) | |
2419 | { | |
2420 | palette[i].red = (png_byte)png_ptr->background.red; | |
2421 | palette[i].green = (png_byte)png_ptr->background.green; | |
2422 | palette[i].blue = (png_byte)png_ptr->background.blue; | |
2423 | } | |
2424 | } | |
2425 | } | |
2426 | } | |
2427 | #endif | |
2428 | } | |
2429 | #endif | |
2430 | ||
2431 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) | |
2432 | /* Replace any alpha or transparency with the supplied background color. | |
2433 | * "background" is already in the screen gamma, while "background_1" is | |
2434 | * at a gamma of 1.0. Paletted files have already been taken care of. | |
2435 | */ | |
2436 | void | |
2437 | png_do_background(png_row_infop row_info, png_bytep row, | |
2438 | png_color_16p trans_values, png_color_16p background, | |
2439 | png_color_16p background_1, | |
2440 | png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, | |
2441 | png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, | |
2442 | png_uint_16pp gamma_16_to_1, int gamma_shift) | |
2443 | { | |
2444 | png_bytep sp, dp; | |
2445 | png_uint_32 i; | |
a626cc03 | 2446 | png_uint_32 row_width=row_info->width; |
c801d85f KB |
2447 | int shift; |
2448 | ||
2449 | png_debug(1, "in png_do_background\n"); | |
2450 | if (background != NULL && | |
2451 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
2452 | row != NULL && row_info != NULL && | |
2453 | #endif | |
2454 | (!(row_info->color_type & PNG_COLOR_MASK_ALPHA) || | |
2455 | (row_info->color_type != PNG_COLOR_TYPE_PALETTE && trans_values))) | |
2456 | { | |
2457 | switch (row_info->color_type) | |
2458 | { | |
2459 | case PNG_COLOR_TYPE_GRAY: | |
2460 | { | |
2461 | switch (row_info->bit_depth) | |
2462 | { | |
2463 | case 1: | |
2464 | { | |
2465 | sp = row; | |
2466 | shift = 7; | |
a626cc03 | 2467 | for (i = 0; i < row_width; i++) |
c801d85f KB |
2468 | { |
2469 | if ((png_uint_16)((*sp >> shift) & 0x1) | |
2470 | == trans_values->gray) | |
2471 | { | |
2472 | *sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff); | |
2473 | *sp |= (png_byte)(background->gray << shift); | |
2474 | } | |
2475 | if (!shift) | |
2476 | { | |
2477 | shift = 7; | |
2478 | sp++; | |
2479 | } | |
2480 | else | |
2481 | shift--; | |
2482 | } | |
2483 | break; | |
2484 | } | |
2485 | case 2: | |
2486 | { | |
a626cc03 RR |
2487 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
2488 | if (gamma_table != NULL) | |
c801d85f | 2489 | { |
a626cc03 RR |
2490 | sp = row; |
2491 | shift = 6; | |
2492 | for (i = 0; i < row_width; i++) | |
c801d85f | 2493 | { |
a626cc03 RR |
2494 | if ((png_uint_16)((*sp >> shift) & 0x3) |
2495 | == trans_values->gray) | |
2496 | { | |
2497 | *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); | |
2498 | *sp |= (png_byte)(background->gray << shift); | |
2499 | } | |
2500 | else | |
2501 | { | |
2502 | png_byte p = (*sp >> shift) & 0x3; | |
2503 | png_byte g = (gamma_table [p | (p << 2) | (p << 4) | | |
2504 | (p << 6)] >> 6) & 0x3; | |
2505 | *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); | |
2506 | *sp |= (png_byte)(g << shift); | |
2507 | } | |
2508 | if (!shift) | |
2509 | { | |
2510 | shift = 6; | |
2511 | sp++; | |
2512 | } | |
2513 | else | |
2514 | shift -= 2; | |
c801d85f | 2515 | } |
a626cc03 RR |
2516 | } |
2517 | else | |
2518 | #endif | |
2519 | { | |
2520 | sp = row; | |
2521 | shift = 6; | |
2522 | for (i = 0; i < row_width; i++) | |
c801d85f | 2523 | { |
a626cc03 RR |
2524 | if ((png_uint_16)((*sp >> shift) & 0x3) |
2525 | == trans_values->gray) | |
2526 | { | |
2527 | *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); | |
2528 | *sp |= (png_byte)(background->gray << shift); | |
2529 | } | |
2530 | if (!shift) | |
2531 | { | |
2532 | shift = 6; | |
2533 | sp++; | |
2534 | } | |
2535 | else | |
2536 | shift -= 2; | |
c801d85f | 2537 | } |
c801d85f KB |
2538 | } |
2539 | break; | |
2540 | } | |
2541 | case 4: | |
2542 | { | |
a626cc03 RR |
2543 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
2544 | if (gamma_table != NULL) | |
c801d85f | 2545 | { |
a626cc03 RR |
2546 | sp = row; |
2547 | shift = 4; | |
2548 | for (i = 0; i < row_width; i++) | |
c801d85f | 2549 | { |
a626cc03 RR |
2550 | if ((png_uint_16)((*sp >> shift) & 0xf) |
2551 | == trans_values->gray) | |
2552 | { | |
2553 | *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); | |
2554 | *sp |= (png_byte)(background->gray << shift); | |
2555 | } | |
2556 | else | |
2557 | { | |
2558 | png_byte p = (*sp >> shift) & 0xf; | |
2559 | png_byte g = (gamma_table[p | (p << 4)] >> 4) & 0xf; | |
2560 | *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); | |
2561 | *sp |= (png_byte)(g << shift); | |
2562 | } | |
2563 | if (!shift) | |
2564 | { | |
2565 | shift = 4; | |
2566 | sp++; | |
2567 | } | |
2568 | else | |
2569 | shift -= 4; | |
c801d85f | 2570 | } |
a626cc03 RR |
2571 | } |
2572 | else | |
2573 | #endif | |
2574 | { | |
2575 | sp = row; | |
2576 | shift = 4; | |
2577 | for (i = 0; i < row_width; i++) | |
c801d85f | 2578 | { |
a626cc03 RR |
2579 | if ((png_uint_16)((*sp >> shift) & 0xf) |
2580 | == trans_values->gray) | |
2581 | { | |
2582 | *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); | |
2583 | *sp |= (png_byte)(background->gray << shift); | |
2584 | } | |
2585 | if (!shift) | |
2586 | { | |
2587 | shift = 4; | |
2588 | sp++; | |
2589 | } | |
2590 | else | |
2591 | shift -= 4; | |
c801d85f | 2592 | } |
c801d85f KB |
2593 | } |
2594 | break; | |
2595 | } | |
2596 | case 8: | |
2597 | { | |
2598 | #if defined(PNG_READ_GAMMA_SUPPORTED) | |
2599 | if (gamma_table != NULL) | |
2600 | { | |
a626cc03 RR |
2601 | sp = row; |
2602 | for (i = 0; i < row_width; i++, sp++) | |
c801d85f KB |
2603 | { |
2604 | if (*sp == trans_values->gray) | |
2605 | { | |
2606 | *sp = (png_byte)background->gray; | |
2607 | } | |
2608 | else | |
2609 | { | |
2610 | *sp = gamma_table[*sp]; | |
2611 | } | |
2612 | } | |
2613 | } | |
2614 | else | |
2615 | #endif | |
2616 | { | |
a626cc03 RR |
2617 | sp = row; |
2618 | for (i = 0; i < row_width; i++, sp++) | |
c801d85f KB |
2619 | { |
2620 | if (*sp == trans_values->gray) | |
2621 | { | |
2622 | *sp = (png_byte)background->gray; | |
2623 | } | |
2624 | } | |
2625 | } | |
2626 | break; | |
2627 | } | |
2628 | case 16: | |
2629 | { | |
2630 | #if defined(PNG_READ_GAMMA_SUPPORTED) | |
2631 | if (gamma_16 != NULL) | |
2632 | { | |
a626cc03 RR |
2633 | sp = row; |
2634 | for (i = 0; i < row_width; i++, sp += 2) | |
c801d85f KB |
2635 | { |
2636 | png_uint_16 v; | |
2637 | ||
2638 | v = ((png_uint_16)(*sp) << 8) + *(sp + 1); | |
2639 | if (v == trans_values->gray) | |
2640 | { | |
2641 | /* background is already in screen gamma */ | |
2642 | *sp = (png_byte)((background->gray >> 8) & 0xff); | |
2643 | *(sp + 1) = (png_byte)(background->gray & 0xff); | |
2644 | } | |
2645 | else | |
2646 | { | |
2647 | v = gamma_16[*(sp + 1) >> gamma_shift][*sp]; | |
2648 | *sp = (png_byte)((v >> 8) & 0xff); | |
2649 | *(sp + 1) = (png_byte)(v & 0xff); | |
2650 | } | |
2651 | } | |
2652 | } | |
2653 | else | |
2654 | #endif | |
2655 | { | |
a626cc03 RR |
2656 | sp = row; |
2657 | for (i = 0; i < row_width; i++, sp += 2) | |
c801d85f KB |
2658 | { |
2659 | png_uint_16 v; | |
2660 | ||
2661 | v = ((png_uint_16)(*sp) << 8) + *(sp + 1); | |
2662 | if (v == trans_values->gray) | |
2663 | { | |
2664 | *sp = (png_byte)((background->gray >> 8) & 0xff); | |
2665 | *(sp + 1) = (png_byte)(background->gray & 0xff); | |
2666 | } | |
2667 | } | |
2668 | } | |
2669 | break; | |
2670 | } | |
2671 | } | |
2672 | break; | |
2673 | } | |
2674 | case PNG_COLOR_TYPE_RGB: | |
2675 | { | |
2676 | if (row_info->bit_depth == 8) | |
2677 | { | |
2678 | #if defined(PNG_READ_GAMMA_SUPPORTED) | |
2679 | if (gamma_table != NULL) | |
2680 | { | |
a626cc03 RR |
2681 | sp = row; |
2682 | for (i = 0; i < row_width; i++, sp += 3) | |
c801d85f KB |
2683 | { |
2684 | if (*sp == trans_values->red && | |
2685 | *(sp + 1) == trans_values->green && | |
2686 | *(sp + 2) == trans_values->blue) | |
2687 | { | |
2688 | *sp = (png_byte)background->red; | |
2689 | *(sp + 1) = (png_byte)background->green; | |
2690 | *(sp + 2) = (png_byte)background->blue; | |
2691 | } | |
2692 | else | |
2693 | { | |
2694 | *sp = gamma_table[*sp]; | |
2695 | *(sp + 1) = gamma_table[*(sp + 1)]; | |
2696 | *(sp + 2) = gamma_table[*(sp + 2)]; | |
2697 | } | |
2698 | } | |
2699 | } | |
2700 | else | |
2701 | #endif | |
2702 | { | |
a626cc03 RR |
2703 | sp = row; |
2704 | for (i = 0; i < row_width; i++, sp += 3) | |
c801d85f KB |
2705 | { |
2706 | if (*sp == trans_values->red && | |
2707 | *(sp + 1) == trans_values->green && | |
2708 | *(sp + 2) == trans_values->blue) | |
2709 | { | |
2710 | *sp = (png_byte)background->red; | |
2711 | *(sp + 1) = (png_byte)background->green; | |
2712 | *(sp + 2) = (png_byte)background->blue; | |
2713 | } | |
2714 | } | |
2715 | } | |
2716 | } | |
2717 | else /* if (row_info->bit_depth == 16) */ | |
2718 | { | |
2719 | #if defined(PNG_READ_GAMMA_SUPPORTED) | |
2720 | if (gamma_16 != NULL) | |
2721 | { | |
a626cc03 RR |
2722 | sp = row; |
2723 | for (i = 0; i < row_width; i++, sp += 6) | |
c801d85f | 2724 | { |
a626cc03 RR |
2725 | png_uint_16 r = ((png_uint_16)(*sp) << 8) + *(sp + 1); |
2726 | png_uint_16 g = ((png_uint_16)(*(sp + 2)) << 8) + *(sp + 3); | |
2727 | png_uint_16 b = ((png_uint_16)(*(sp + 4)) << 8) + *(sp + 5); | |
c801d85f KB |
2728 | if (r == trans_values->red && g == trans_values->green && |
2729 | b == trans_values->blue) | |
2730 | { | |
2731 | /* background is already in screen gamma */ | |
2732 | *sp = (png_byte)((background->red >> 8) & 0xff); | |
2733 | *(sp + 1) = (png_byte)(background->red & 0xff); | |
2734 | *(sp + 2) = (png_byte)((background->green >> 8) & 0xff); | |
2735 | *(sp + 3) = (png_byte)(background->green & 0xff); | |
2736 | *(sp + 4) = (png_byte)((background->blue >> 8) & 0xff); | |
2737 | *(sp + 5) = (png_byte)(background->blue & 0xff); | |
2738 | } | |
2739 | else | |
2740 | { | |
a626cc03 | 2741 | png_uint_16 v = gamma_16[*(sp + 1) >> gamma_shift][*sp]; |
c801d85f KB |
2742 | *sp = (png_byte)((v >> 8) & 0xff); |
2743 | *(sp + 1) = (png_byte)(v & 0xff); | |
2744 | v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)]; | |
2745 | *(sp + 2) = (png_byte)((v >> 8) & 0xff); | |
2746 | *(sp + 3) = (png_byte)(v & 0xff); | |
2747 | v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)]; | |
2748 | *(sp + 4) = (png_byte)((v >> 8) & 0xff); | |
2749 | *(sp + 5) = (png_byte)(v & 0xff); | |
2750 | } | |
2751 | } | |
2752 | } | |
2753 | else | |
2754 | #endif | |
2755 | { | |
a626cc03 RR |
2756 | sp = row; |
2757 | for (i = 0; i < row_width; i++, sp += 6) | |
c801d85f | 2758 | { |
a626cc03 RR |
2759 | png_uint_16 r = ((png_uint_16)(*sp) << 8) + *(sp + 1); |
2760 | png_uint_16 g = ((png_uint_16)(*(sp + 2)) << 8) + *(sp + 3); | |
2761 | png_uint_16 b = ((png_uint_16)(*(sp + 4)) << 8) + *(sp + 5); | |
c801d85f | 2762 | |
c801d85f KB |
2763 | if (r == trans_values->red && g == trans_values->green && |
2764 | b == trans_values->blue) | |
2765 | { | |
2766 | *sp = (png_byte)((background->red >> 8) & 0xff); | |
2767 | *(sp + 1) = (png_byte)(background->red & 0xff); | |
2768 | *(sp + 2) = (png_byte)((background->green >> 8) & 0xff); | |
2769 | *(sp + 3) = (png_byte)(background->green & 0xff); | |
2770 | *(sp + 4) = (png_byte)((background->blue >> 8) & 0xff); | |
2771 | *(sp + 5) = (png_byte)(background->blue & 0xff); | |
2772 | } | |
2773 | } | |
2774 | } | |
2775 | } | |
2776 | break; | |
2777 | } | |
2778 | case PNG_COLOR_TYPE_GRAY_ALPHA: | |
2779 | { | |
2780 | if (row_info->bit_depth == 8) | |
2781 | { | |
2782 | #if defined(PNG_READ_GAMMA_SUPPORTED) | |
2783 | if (gamma_to_1 != NULL && gamma_from_1 != NULL && | |
2784 | gamma_table != NULL) | |
2785 | { | |
a626cc03 RR |
2786 | sp = row; |
2787 | dp = row; | |
2788 | for (i = 0; i < row_width; i++, sp += 2, dp++) | |
c801d85f | 2789 | { |
a626cc03 | 2790 | png_uint_16 a = *(sp + 1); |
c801d85f | 2791 | |
c801d85f KB |
2792 | if (a == 0xff) |
2793 | { | |
2794 | *dp = gamma_table[*sp]; | |
2795 | } | |
2796 | else if (a == 0) | |
2797 | { | |
2798 | /* background is already in screen gamma */ | |
2799 | *dp = (png_byte)background->gray; | |
2800 | } | |
2801 | else | |
2802 | { | |
2803 | png_byte v, w; | |
2804 | ||
2805 | v = gamma_to_1[*sp]; | |
2806 | png_composite(w, v, a, background_1->gray); | |
2807 | *dp = gamma_from_1[w]; | |
2808 | } | |
2809 | } | |
2810 | } | |
2811 | else | |
2812 | #endif | |
2813 | { | |
a626cc03 RR |
2814 | sp = row; |
2815 | dp = row; | |
2816 | for (i = 0; i < row_width; i++, sp += 2, dp++) | |
c801d85f | 2817 | { |
a626cc03 | 2818 | png_byte a = *(sp + 1); |
c801d85f | 2819 | |
c801d85f KB |
2820 | if (a == 0xff) |
2821 | { | |
2822 | *dp = *sp; | |
2823 | } | |
2824 | else if (a == 0) | |
2825 | { | |
2826 | *dp = (png_byte)background->gray; | |
2827 | } | |
2828 | else | |
2829 | { | |
2830 | png_composite(*dp, *sp, a, background_1->gray); | |
2831 | } | |
2832 | } | |
2833 | } | |
2834 | } | |
2835 | else /* if (png_ptr->bit_depth == 16) */ | |
2836 | { | |
2837 | #if defined(PNG_READ_GAMMA_SUPPORTED) | |
2838 | if (gamma_16 != NULL && gamma_16_from_1 != NULL && | |
2839 | gamma_16_to_1 != NULL) | |
2840 | { | |
a626cc03 RR |
2841 | sp = row; |
2842 | dp = row; | |
2843 | for (i = 0; i < row_width; i++, sp += 4, dp += 2) | |
c801d85f | 2844 | { |
a626cc03 | 2845 | png_uint_16 a = ((png_uint_16)(*(sp + 2)) << 8) + *(sp + 3); |
c801d85f | 2846 | |
c801d85f KB |
2847 | if (a == (png_uint_16)0xffff) |
2848 | { | |
2849 | png_uint_16 v; | |
2850 | ||
2851 | v = gamma_16[*(sp + 1) >> gamma_shift][*sp]; | |
2852 | *dp = (png_byte)((v >> 8) & 0xff); | |
2853 | *(dp + 1) = (png_byte)(v & 0xff); | |
2854 | } | |
2855 | else if (a == 0) | |
2856 | { | |
2857 | /* background is already in screen gamma */ | |
2858 | *dp = (png_byte)((background->gray >> 8) & 0xff); | |
2859 | *(dp + 1) = (png_byte)(background->gray & 0xff); | |
2860 | } | |
2861 | else | |
2862 | { | |
2863 | png_uint_16 g, v, w; | |
2864 | ||
2865 | g = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp]; | |
2866 | png_composite_16(v, g, a, background_1->gray); | |
2867 | w = gamma_16_from_1[(v&0xff) >> gamma_shift][v >> 8]; | |
2868 | *dp = (png_byte)((w >> 8) & 0xff); | |
2869 | *(dp + 1) = (png_byte)(w & 0xff); | |
2870 | } | |
2871 | } | |
2872 | } | |
2873 | else | |
2874 | #endif | |
2875 | { | |
a626cc03 RR |
2876 | sp = row; |
2877 | dp = row; | |
2878 | for (i = 0; i < row_width; i++, sp += 4, dp += 2) | |
c801d85f | 2879 | { |
a626cc03 | 2880 | png_uint_16 a = ((png_uint_16)(*(sp + 2)) << 8) + *(sp + 3); |
c801d85f KB |
2881 | if (a == (png_uint_16)0xffff) |
2882 | { | |
2883 | png_memcpy(dp, sp, 2); | |
2884 | } | |
2885 | else if (a == 0) | |
2886 | { | |
2887 | *dp = (png_byte)((background->gray >> 8) & 0xff); | |
2888 | *(dp + 1) = (png_byte)(background->gray & 0xff); | |
2889 | } | |
2890 | else | |
2891 | { | |
2892 | png_uint_16 g, v; | |
2893 | ||
2894 | g = ((png_uint_16)(*sp) << 8) + *(sp + 1); | |
2895 | png_composite_16(v, g, a, background_1->gray); | |
2896 | *dp = (png_byte)((v >> 8) & 0xff); | |
2897 | *(dp + 1) = (png_byte)(v & 0xff); | |
2898 | } | |
2899 | } | |
2900 | } | |
2901 | } | |
2902 | break; | |
2903 | } | |
2904 | case PNG_COLOR_TYPE_RGB_ALPHA: | |
2905 | { | |
2906 | if (row_info->bit_depth == 8) | |
2907 | { | |
2908 | #if defined(PNG_READ_GAMMA_SUPPORTED) | |
2909 | if (gamma_to_1 != NULL && gamma_from_1 != NULL && | |
2910 | gamma_table != NULL) | |
2911 | { | |
a626cc03 RR |
2912 | sp = row; |
2913 | dp = row; | |
2914 | for (i = 0; i < row_width; i++, sp += 4, dp += 3) | |
c801d85f | 2915 | { |
a626cc03 | 2916 | png_byte a = *(sp + 3); |
c801d85f | 2917 | |
c801d85f KB |
2918 | if (a == 0xff) |
2919 | { | |
2920 | *dp = gamma_table[*sp]; | |
2921 | *(dp + 1) = gamma_table[*(sp + 1)]; | |
2922 | *(dp + 2) = gamma_table[*(sp + 2)]; | |
2923 | } | |
2924 | else if (a == 0) | |
2925 | { | |
2926 | /* background is already in screen gamma */ | |
2927 | *dp = (png_byte)background->red; | |
2928 | *(dp + 1) = (png_byte)background->green; | |
2929 | *(dp + 2) = (png_byte)background->blue; | |
2930 | } | |
2931 | else | |
2932 | { | |
2933 | png_byte v, w; | |
2934 | ||
2935 | v = gamma_to_1[*sp]; | |
2936 | png_composite(w, v, a, background_1->red); | |
2937 | *dp = gamma_from_1[w]; | |
2938 | v = gamma_to_1[*(sp + 1)]; | |
2939 | png_composite(w, v, a, background_1->green); | |
2940 | *(dp + 1) = gamma_from_1[w]; | |
2941 | v = gamma_to_1[*(sp + 2)]; | |
2942 | png_composite(w, v, a, background_1->blue); | |
2943 | *(dp + 2) = gamma_from_1[w]; | |
2944 | } | |
2945 | } | |
2946 | } | |
2947 | else | |
2948 | #endif | |
2949 | { | |
a626cc03 RR |
2950 | sp = row; |
2951 | dp = row; | |
2952 | for (i = 0; i < row_width; i++, sp += 4, dp += 3) | |
c801d85f | 2953 | { |
a626cc03 | 2954 | png_byte a = *(sp + 3); |
c801d85f | 2955 | |
c801d85f KB |
2956 | if (a == 0xff) |
2957 | { | |
2958 | *dp = *sp; | |
2959 | *(dp + 1) = *(sp + 1); | |
2960 | *(dp + 2) = *(sp + 2); | |
2961 | } | |
2962 | else if (a == 0) | |
2963 | { | |
2964 | *dp = (png_byte)background->red; | |
2965 | *(dp + 1) = (png_byte)background->green; | |
2966 | *(dp + 2) = (png_byte)background->blue; | |
2967 | } | |
2968 | else | |
2969 | { | |
2970 | png_composite(*dp, *sp, a, background->red); | |
2971 | png_composite(*(dp + 1), *(sp + 1), a, | |
2972 | background->green); | |
2973 | png_composite(*(dp + 2), *(sp + 2), a, | |
2974 | background->blue); | |
2975 | } | |
2976 | } | |
2977 | } | |
2978 | } | |
2979 | else /* if (row_info->bit_depth == 16) */ | |
2980 | { | |
2981 | #if defined(PNG_READ_GAMMA_SUPPORTED) | |
2982 | if (gamma_16 != NULL && gamma_16_from_1 != NULL && | |
2983 | gamma_16_to_1 != NULL) | |
2984 | { | |
a626cc03 RR |
2985 | sp = row; |
2986 | dp = row; | |
2987 | for (i = 0; i < row_width; i++, sp += 8, dp += 6) | |
c801d85f | 2988 | { |
a626cc03 RR |
2989 | png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6)) |
2990 | << 8) + (png_uint_16)(*(sp + 7))); | |
c801d85f KB |
2991 | if (a == (png_uint_16)0xffff) |
2992 | { | |
2993 | png_uint_16 v; | |
2994 | ||
2995 | v = gamma_16[*(sp + 1) >> gamma_shift][*sp]; | |
2996 | *dp = (png_byte)((v >> 8) & 0xff); | |
2997 | *(dp + 1) = (png_byte)(v & 0xff); | |
2998 | v = gamma_16[*(sp + 3) >> gamma_shift][*(sp + 2)]; | |
2999 | *(dp + 2) = (png_byte)((v >> 8) & 0xff); | |
3000 | *(dp + 3) = (png_byte)(v & 0xff); | |
3001 | v = gamma_16[*(sp + 5) >> gamma_shift][*(sp + 4)]; | |
3002 | *(dp + 4) = (png_byte)((v >> 8) & 0xff); | |
3003 | *(dp + 5) = (png_byte)(v & 0xff); | |
3004 | } | |
3005 | else if (a == 0) | |
3006 | { | |
3007 | /* background is already in screen gamma */ | |
3008 | *dp = (png_byte)((background->red >> 8) & 0xff); | |
3009 | *(dp + 1) = (png_byte)(background->red & 0xff); | |
3010 | *(dp + 2) = (png_byte)((background->green >> 8) & 0xff); | |
3011 | *(dp + 3) = (png_byte)(background->green & 0xff); | |
3012 | *(dp + 4) = (png_byte)((background->blue >> 8) & 0xff); | |
3013 | *(dp + 5) = (png_byte)(background->blue & 0xff); | |
3014 | } | |
3015 | else | |
3016 | { | |
3017 | png_uint_16 v, w, x; | |
3018 | ||
3019 | v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp]; | |
3020 | png_composite_16(w, v, a, background->red); | |
3021 | x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8]; | |
3022 | *dp = (png_byte)((x >> 8) & 0xff); | |
3023 | *(dp + 1) = (png_byte)(x & 0xff); | |
3024 | v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)]; | |
3025 | png_composite_16(w, v, a, background->green); | |
3026 | x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8]; | |
3027 | *(dp + 2) = (png_byte)((x >> 8) & 0xff); | |
3028 | *(dp + 3) = (png_byte)(x & 0xff); | |
3029 | v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)]; | |
3030 | png_composite_16(w, v, a, background->blue); | |
3031 | x = gamma_16_from_1[(w & 0xff) >> gamma_shift][w >> 8]; | |
3032 | *(dp + 4) = (png_byte)((x >> 8) & 0xff); | |
3033 | *(dp + 5) = (png_byte)(x & 0xff); | |
3034 | } | |
3035 | } | |
3036 | } | |
3037 | else | |
3038 | #endif | |
3039 | { | |
a626cc03 RR |
3040 | sp = row; |
3041 | dp = row; | |
3042 | for (i = 0; i < row_width; i++, sp += 8, dp += 6) | |
c801d85f | 3043 | { |
a626cc03 RR |
3044 | png_uint_16 a = (png_uint_16)(((png_uint_16)(*(sp + 6)) |
3045 | << 8) + (png_uint_16)(*(sp + 7))); | |
c801d85f KB |
3046 | if (a == (png_uint_16)0xffff) |
3047 | { | |
3048 | png_memcpy(dp, sp, 6); | |
3049 | } | |
3050 | else if (a == 0) | |
3051 | { | |
3052 | *dp = (png_byte)((background->red >> 8) & 0xff); | |
3053 | *(dp + 1) = (png_byte)(background->red & 0xff); | |
3054 | *(dp + 2) = (png_byte)((background->green >> 8) & 0xff); | |
3055 | *(dp + 3) = (png_byte)(background->green & 0xff); | |
3056 | *(dp + 4) = (png_byte)((background->blue >> 8) & 0xff); | |
3057 | *(dp + 5) = (png_byte)(background->blue & 0xff); | |
3058 | } | |
3059 | else | |
3060 | { | |
a626cc03 | 3061 | png_uint_16 v; |
c801d85f | 3062 | |
a626cc03 RR |
3063 | png_uint_16 r = ((png_uint_16)(*sp) << 8) + *(sp + 1); |
3064 | png_uint_16 g = ((png_uint_16)(*(sp + 2)) << 8) | |
3065 | + *(sp + 3); | |
3066 | png_uint_16 b = ((png_uint_16)(*(sp + 4)) << 8) | |
3067 | + *(sp + 5); | |
c801d85f KB |
3068 | |
3069 | png_composite_16(v, r, a, background->red); | |
3070 | *dp = (png_byte)((v >> 8) & 0xff); | |
3071 | *(dp + 1) = (png_byte)(v & 0xff); | |
3072 | png_composite_16(v, g, a, background->green); | |
3073 | *(dp + 2) = (png_byte)((v >> 8) & 0xff); | |
3074 | *(dp + 3) = (png_byte)(v & 0xff); | |
3075 | png_composite_16(v, b, a, background->blue); | |
3076 | *(dp + 4) = (png_byte)((v >> 8) & 0xff); | |
3077 | *(dp + 5) = (png_byte)(v & 0xff); | |
3078 | } | |
3079 | } | |
3080 | } | |
3081 | } | |
3082 | break; | |
3083 | } | |
3084 | } | |
3085 | ||
3086 | if (row_info->color_type & PNG_COLOR_MASK_ALPHA) | |
3087 | { | |
3088 | row_info->color_type &= ~PNG_COLOR_MASK_ALPHA; | |
3089 | row_info->channels--; | |
3090 | row_info->pixel_depth = (png_byte)(row_info->channels * | |
3091 | row_info->bit_depth); | |
a626cc03 | 3092 | row_info->rowbytes = ((row_width * |
c801d85f KB |
3093 | row_info->pixel_depth + 7) >> 3); |
3094 | } | |
3095 | } | |
3096 | } | |
3097 | #endif | |
3098 | ||
3099 | #if defined(PNG_READ_GAMMA_SUPPORTED) | |
3100 | /* Gamma correct the image, avoiding the alpha channel. Make sure | |
a626cc03 | 3101 | * you do this after you deal with the transparency issue on grayscale |
c801d85f KB |
3102 | * or rgb images. If your bit depth is 8, use gamma_table, if it |
3103 | * is 16, use gamma_16_table and gamma_shift. Build these with | |
3104 | * build_gamma_table(). | |
3105 | */ | |
3106 | void | |
3107 | png_do_gamma(png_row_infop row_info, png_bytep row, | |
3108 | png_bytep gamma_table, png_uint_16pp gamma_16_table, | |
3109 | int gamma_shift) | |
3110 | { | |
3111 | png_bytep sp; | |
3112 | png_uint_32 i; | |
a626cc03 | 3113 | png_uint_32 row_width=row_info->width; |
c801d85f KB |
3114 | |
3115 | png_debug(1, "in png_do_gamma\n"); | |
3116 | if ( | |
3117 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
3118 | row != NULL && row_info != NULL && | |
3119 | #endif | |
3120 | ((row_info->bit_depth <= 8 && gamma_table != NULL) || | |
3121 | (row_info->bit_depth == 16 && gamma_16_table != NULL))) | |
3122 | { | |
3123 | switch (row_info->color_type) | |
3124 | { | |
3125 | case PNG_COLOR_TYPE_RGB: | |
3126 | { | |
3127 | if (row_info->bit_depth == 8) | |
3128 | { | |
a626cc03 RR |
3129 | sp = row; |
3130 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
3131 | { |
3132 | *sp = gamma_table[*sp]; | |
3133 | sp++; | |
3134 | *sp = gamma_table[*sp]; | |
3135 | sp++; | |
3136 | *sp = gamma_table[*sp]; | |
3137 | sp++; | |
3138 | } | |
3139 | } | |
3140 | else /* if (row_info->bit_depth == 16) */ | |
3141 | { | |
a626cc03 RR |
3142 | sp = row; |
3143 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
3144 | { |
3145 | png_uint_16 v; | |
3146 | ||
3147 | v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; | |
3148 | *sp = (png_byte)((v >> 8) & 0xff); | |
3149 | *(sp + 1) = (png_byte)(v & 0xff); | |
3150 | sp += 2; | |
3151 | v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; | |
3152 | *sp = (png_byte)((v >> 8) & 0xff); | |
3153 | *(sp + 1) = (png_byte)(v & 0xff); | |
3154 | sp += 2; | |
3155 | v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; | |
3156 | *sp = (png_byte)((v >> 8) & 0xff); | |
3157 | *(sp + 1) = (png_byte)(v & 0xff); | |
3158 | sp += 2; | |
3159 | } | |
3160 | } | |
3161 | break; | |
3162 | } | |
3163 | case PNG_COLOR_TYPE_RGB_ALPHA: | |
3164 | { | |
3165 | if (row_info->bit_depth == 8) | |
3166 | { | |
a626cc03 RR |
3167 | sp = row; |
3168 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
3169 | { |
3170 | *sp = gamma_table[*sp]; | |
3171 | sp++; | |
3172 | *sp = gamma_table[*sp]; | |
3173 | sp++; | |
3174 | *sp = gamma_table[*sp]; | |
3175 | sp++; | |
3176 | sp++; | |
3177 | } | |
3178 | } | |
3179 | else /* if (row_info->bit_depth == 16) */ | |
3180 | { | |
a626cc03 RR |
3181 | sp = row; |
3182 | for (i = 0; i < row_width; i++) | |
c801d85f | 3183 | { |
a626cc03 | 3184 | png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; |
c801d85f KB |
3185 | *sp = (png_byte)((v >> 8) & 0xff); |
3186 | *(sp + 1) = (png_byte)(v & 0xff); | |
3187 | sp += 2; | |
3188 | v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; | |
3189 | *sp = (png_byte)((v >> 8) & 0xff); | |
3190 | *(sp + 1) = (png_byte)(v & 0xff); | |
3191 | sp += 2; | |
3192 | v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; | |
3193 | *sp = (png_byte)((v >> 8) & 0xff); | |
3194 | *(sp + 1) = (png_byte)(v & 0xff); | |
3195 | sp += 4; | |
3196 | } | |
3197 | } | |
3198 | break; | |
3199 | } | |
3200 | case PNG_COLOR_TYPE_GRAY_ALPHA: | |
3201 | { | |
3202 | if (row_info->bit_depth == 8) | |
3203 | { | |
a626cc03 RR |
3204 | sp = row; |
3205 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
3206 | { |
3207 | *sp = gamma_table[*sp]; | |
3208 | sp += 2; | |
3209 | } | |
3210 | } | |
3211 | else /* if (row_info->bit_depth == 16) */ | |
3212 | { | |
a626cc03 RR |
3213 | sp = row; |
3214 | for (i = 0; i < row_width; i++) | |
c801d85f | 3215 | { |
a626cc03 | 3216 | png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; |
c801d85f KB |
3217 | *sp = (png_byte)((v >> 8) & 0xff); |
3218 | *(sp + 1) = (png_byte)(v & 0xff); | |
3219 | sp += 4; | |
3220 | } | |
3221 | } | |
3222 | break; | |
3223 | } | |
3224 | case PNG_COLOR_TYPE_GRAY: | |
3225 | { | |
3226 | if (row_info->bit_depth == 2) | |
3227 | { | |
a626cc03 RR |
3228 | sp = row; |
3229 | for (i = 0; i < row_width; i += 4) | |
c801d85f KB |
3230 | { |
3231 | int a = *sp & 0xc0; | |
3232 | int b = *sp & 0x30; | |
3233 | int c = *sp & 0x0c; | |
3234 | int d = *sp & 0x03; | |
3235 | ||
3236 | *sp = ((((int)gamma_table[a|(a>>2)|(a>>4)|(a>>6)]) ) & 0xc0)| | |
3237 | ((((int)gamma_table[(b<<2)|b|(b>>2)|(b>>4)])>>2) & 0x30)| | |
3238 | ((((int)gamma_table[(c<<4)|(c<<2)|c|(c>>2)])>>4) & 0x0c)| | |
3239 | ((((int)gamma_table[(d<<6)|(d<<4)|(d<<2)|d])>>6) ); | |
3240 | sp++; | |
3241 | } | |
3242 | } | |
3243 | if (row_info->bit_depth == 4) | |
3244 | { | |
a626cc03 RR |
3245 | sp = row; |
3246 | for (i = 0; i < row_width; i += 2) | |
c801d85f KB |
3247 | { |
3248 | int msb = *sp & 0xf0; | |
3249 | int lsb = *sp & 0x0f; | |
3250 | ||
3251 | *sp = (((int)gamma_table[msb | (msb >> 4)]) & 0xf0) | | |
3252 | (((int)gamma_table[(lsb << 4) | lsb]) >> 4); | |
3253 | sp++; | |
3254 | } | |
3255 | } | |
3256 | else if (row_info->bit_depth == 8) | |
3257 | { | |
a626cc03 RR |
3258 | sp = row; |
3259 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
3260 | { |
3261 | *sp = gamma_table[*sp]; | |
3262 | sp++; | |
3263 | } | |
3264 | } | |
3265 | else if (row_info->bit_depth == 16) | |
3266 | { | |
a626cc03 RR |
3267 | sp = row; |
3268 | for (i = 0; i < row_width; i++) | |
c801d85f | 3269 | { |
a626cc03 | 3270 | png_uint_16 v = gamma_16_table[*(sp + 1) >> gamma_shift][*sp]; |
c801d85f KB |
3271 | *sp = (png_byte)((v >> 8) & 0xff); |
3272 | *(sp + 1) = (png_byte)(v & 0xff); | |
3273 | sp += 2; | |
3274 | } | |
3275 | } | |
3276 | break; | |
3277 | } | |
3278 | } | |
3279 | } | |
3280 | } | |
3281 | #endif | |
3282 | ||
3283 | #if defined(PNG_READ_EXPAND_SUPPORTED) | |
3284 | /* Expands a palette row to an rgb or rgba row depending | |
3285 | * upon whether you supply trans and num_trans. | |
3286 | */ | |
3287 | void | |
3288 | png_do_expand_palette(png_row_infop row_info, png_bytep row, | |
3289 | png_colorp palette, png_bytep trans, int num_trans) | |
3290 | { | |
3291 | int shift, value; | |
3292 | png_bytep sp, dp; | |
3293 | png_uint_32 i; | |
a626cc03 | 3294 | png_uint_32 row_width=row_info->width; |
c801d85f KB |
3295 | |
3296 | png_debug(1, "in png_do_expand_palette\n"); | |
3297 | if ( | |
3298 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
3299 | row != NULL && row_info != NULL && | |
3300 | #endif | |
3301 | row_info->color_type == PNG_COLOR_TYPE_PALETTE) | |
3302 | { | |
3303 | if (row_info->bit_depth < 8) | |
3304 | { | |
3305 | switch (row_info->bit_depth) | |
3306 | { | |
3307 | case 1: | |
3308 | { | |
a626cc03 RR |
3309 | sp = row + (png_size_t)((row_width - 1) >> 3); |
3310 | dp = row + (png_size_t)row_width - 1; | |
3311 | shift = 7 - (int)((row_width + 7) & 7); | |
3312 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
3313 | { |
3314 | if ((*sp >> shift) & 0x1) | |
3315 | *dp = 1; | |
3316 | else | |
3317 | *dp = 0; | |
3318 | if (shift == 7) | |
3319 | { | |
3320 | shift = 0; | |
3321 | sp--; | |
3322 | } | |
3323 | else | |
3324 | shift++; | |
3325 | ||
3326 | dp--; | |
3327 | } | |
3328 | break; | |
3329 | } | |
3330 | case 2: | |
3331 | { | |
a626cc03 RR |
3332 | sp = row + (png_size_t)((row_width - 1) >> 2); |
3333 | dp = row + (png_size_t)row_width - 1; | |
3334 | shift = (int)((3 - ((row_width + 3) & 3)) << 1); | |
3335 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
3336 | { |
3337 | value = (*sp >> shift) & 0x3; | |
3338 | *dp = (png_byte)value; | |
3339 | if (shift == 6) | |
3340 | { | |
3341 | shift = 0; | |
3342 | sp--; | |
3343 | } | |
3344 | else | |
3345 | shift += 2; | |
3346 | ||
3347 | dp--; | |
3348 | } | |
3349 | break; | |
3350 | } | |
3351 | case 4: | |
3352 | { | |
a626cc03 RR |
3353 | sp = row + (png_size_t)((row_width - 1) >> 1); |
3354 | dp = row + (png_size_t)row_width - 1; | |
3355 | shift = (int)((row_width & 1) << 2); | |
3356 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
3357 | { |
3358 | value = (*sp >> shift) & 0xf; | |
3359 | *dp = (png_byte)value; | |
3360 | if (shift == 4) | |
3361 | { | |
3362 | shift = 0; | |
3363 | sp--; | |
3364 | } | |
3365 | else | |
3366 | shift += 4; | |
3367 | ||
3368 | dp--; | |
3369 | } | |
3370 | break; | |
3371 | } | |
3372 | } | |
3373 | row_info->bit_depth = 8; | |
3374 | row_info->pixel_depth = 8; | |
a626cc03 | 3375 | row_info->rowbytes = row_width; |
c801d85f KB |
3376 | } |
3377 | switch (row_info->bit_depth) | |
3378 | { | |
3379 | case 8: | |
3380 | { | |
3381 | if (trans != NULL) | |
3382 | { | |
a626cc03 RR |
3383 | sp = row + (png_size_t)row_width - 1; |
3384 | dp = row + (png_size_t)(row_width << 2) - 1; | |
c801d85f | 3385 | |
a626cc03 | 3386 | for (i = 0; i < row_width; i++) |
c801d85f KB |
3387 | { |
3388 | if ((int)(*sp) >= num_trans) | |
3389 | *dp-- = 0xff; | |
3390 | else | |
3391 | *dp-- = trans[*sp]; | |
3392 | *dp-- = palette[*sp].blue; | |
3393 | *dp-- = palette[*sp].green; | |
3394 | *dp-- = palette[*sp].red; | |
3395 | sp--; | |
3396 | } | |
3397 | row_info->bit_depth = 8; | |
3398 | row_info->pixel_depth = 32; | |
a626cc03 | 3399 | row_info->rowbytes = row_width * 4; |
c801d85f KB |
3400 | row_info->color_type = 6; |
3401 | row_info->channels = 4; | |
3402 | } | |
3403 | else | |
3404 | { | |
a626cc03 RR |
3405 | sp = row + (png_size_t)row_width - 1; |
3406 | dp = row + (png_size_t)(row_width * 3) - 1; | |
c801d85f | 3407 | |
a626cc03 | 3408 | for (i = 0; i < row_width; i++) |
c801d85f KB |
3409 | { |
3410 | *dp-- = palette[*sp].blue; | |
3411 | *dp-- = palette[*sp].green; | |
3412 | *dp-- = palette[*sp].red; | |
3413 | sp--; | |
3414 | } | |
3415 | row_info->bit_depth = 8; | |
3416 | row_info->pixel_depth = 24; | |
a626cc03 | 3417 | row_info->rowbytes = row_width * 3; |
c801d85f KB |
3418 | row_info->color_type = 2; |
3419 | row_info->channels = 3; | |
3420 | } | |
3421 | break; | |
3422 | } | |
3423 | } | |
3424 | } | |
3425 | } | |
3426 | ||
3427 | /* If the bit depth < 8, it is expanded to 8. Also, if the | |
3428 | * transparency value is supplied, an alpha channel is built. | |
3429 | */ | |
3430 | void | |
3431 | png_do_expand(png_row_infop row_info, png_bytep row, | |
3432 | png_color_16p trans_value) | |
3433 | { | |
3434 | int shift, value; | |
3435 | png_bytep sp, dp; | |
3436 | png_uint_32 i; | |
a626cc03 | 3437 | png_uint_32 row_width=row_info->width; |
c801d85f KB |
3438 | |
3439 | png_debug(1, "in png_do_expand\n"); | |
3440 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
3441 | if (row != NULL && row_info != NULL) | |
3442 | #endif | |
3443 | { | |
3444 | if (row_info->color_type == PNG_COLOR_TYPE_GRAY) | |
3445 | { | |
3446 | png_uint_16 gray = trans_value ? trans_value->gray : 0; | |
3447 | ||
3448 | if (row_info->bit_depth < 8) | |
3449 | { | |
3450 | switch (row_info->bit_depth) | |
3451 | { | |
3452 | case 1: | |
3453 | { | |
3454 | gray *= 0xff; | |
a626cc03 RR |
3455 | sp = row + (png_size_t)((row_width - 1) >> 3); |
3456 | dp = row + (png_size_t)row_width - 1; | |
3457 | shift = 7 - (int)((row_width + 7) & 7); | |
3458 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
3459 | { |
3460 | if ((*sp >> shift) & 0x1) | |
3461 | *dp = 0xff; | |
3462 | else | |
3463 | *dp = 0; | |
3464 | if (shift == 7) | |
3465 | { | |
3466 | shift = 0; | |
3467 | sp--; | |
3468 | } | |
3469 | else | |
3470 | shift++; | |
3471 | ||
3472 | dp--; | |
3473 | } | |
3474 | break; | |
3475 | } | |
3476 | case 2: | |
3477 | { | |
3478 | gray *= 0x55; | |
a626cc03 RR |
3479 | sp = row + (png_size_t)((row_width - 1) >> 2); |
3480 | dp = row + (png_size_t)row_width - 1; | |
3481 | shift = (int)((3 - ((row_width + 3) & 3)) << 1); | |
3482 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
3483 | { |
3484 | value = (*sp >> shift) & 0x3; | |
3485 | *dp = (png_byte)(value | (value << 2) | (value << 4) | | |
3486 | (value << 6)); | |
3487 | if (shift == 6) | |
3488 | { | |
3489 | shift = 0; | |
3490 | sp--; | |
3491 | } | |
3492 | else | |
3493 | shift += 2; | |
3494 | ||
3495 | dp--; | |
3496 | } | |
3497 | break; | |
3498 | } | |
3499 | case 4: | |
3500 | { | |
3501 | gray *= 0x11; | |
a626cc03 RR |
3502 | sp = row + (png_size_t)((row_width - 1) >> 1); |
3503 | dp = row + (png_size_t)row_width - 1; | |
3504 | shift = (int)((1 - ((row_width + 1) & 1)) << 2); | |
3505 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
3506 | { |
3507 | value = (*sp >> shift) & 0xf; | |
3508 | *dp = (png_byte)(value | (value << 4)); | |
3509 | if (shift == 4) | |
3510 | { | |
3511 | shift = 0; | |
3512 | sp--; | |
3513 | } | |
3514 | else | |
3515 | shift = 4; | |
3516 | ||
3517 | dp--; | |
3518 | } | |
3519 | break; | |
3520 | } | |
3521 | } | |
3522 | row_info->bit_depth = 8; | |
3523 | row_info->pixel_depth = 8; | |
a626cc03 | 3524 | row_info->rowbytes = row_width; |
c801d85f KB |
3525 | } |
3526 | ||
3527 | if (trans_value != NULL) | |
3528 | { | |
3529 | if (row_info->bit_depth == 8) | |
3530 | { | |
a626cc03 RR |
3531 | sp = row + (png_size_t)row_width - 1; |
3532 | dp = row + (png_size_t)(row_width << 1) - 1; | |
3533 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
3534 | { |
3535 | if (*sp == gray) | |
3536 | *dp-- = 0; | |
3537 | else | |
3538 | *dp-- = 0xff; | |
3539 | *dp-- = *sp--; | |
3540 | } | |
3541 | } | |
3542 | else if (row_info->bit_depth == 16) | |
3543 | { | |
3544 | sp = row + row_info->rowbytes - 1; | |
3545 | dp = row + (row_info->rowbytes << 1) - 1; | |
a626cc03 | 3546 | for (i = 0; i < row_width; i++) |
c801d85f KB |
3547 | { |
3548 | if (((png_uint_16)*(sp) | | |
3549 | ((png_uint_16)*(sp - 1) << 8)) == gray) | |
3550 | { | |
3551 | *dp-- = 0; | |
3552 | *dp-- = 0; | |
3553 | } | |
3554 | else | |
3555 | { | |
3556 | *dp-- = 0xff; | |
3557 | *dp-- = 0xff; | |
3558 | } | |
3559 | *dp-- = *sp--; | |
3560 | *dp-- = *sp--; | |
3561 | } | |
3562 | } | |
3563 | row_info->color_type = PNG_COLOR_TYPE_GRAY_ALPHA; | |
3564 | row_info->channels = 2; | |
3565 | row_info->pixel_depth = (png_byte)(row_info->bit_depth << 1); | |
3566 | row_info->rowbytes = | |
a626cc03 | 3567 | ((row_width * row_info->pixel_depth) >> 3); |
c801d85f KB |
3568 | } |
3569 | } | |
3570 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB && trans_value) | |
3571 | { | |
3572 | if (row_info->bit_depth == 8) | |
3573 | { | |
3574 | sp = row + (png_size_t)row_info->rowbytes - 1; | |
a626cc03 RR |
3575 | dp = row + (png_size_t)(row_width << 2) - 1; |
3576 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
3577 | { |
3578 | if (*(sp - 2) == trans_value->red && | |
3579 | *(sp - 1) == trans_value->green && | |
3580 | *(sp - 0) == trans_value->blue) | |
3581 | *dp-- = 0; | |
3582 | else | |
3583 | *dp-- = 0xff; | |
3584 | *dp-- = *sp--; | |
3585 | *dp-- = *sp--; | |
3586 | *dp-- = *sp--; | |
3587 | } | |
3588 | } | |
3589 | else if (row_info->bit_depth == 16) | |
3590 | { | |
3591 | sp = row + row_info->rowbytes - 1; | |
a626cc03 RR |
3592 | dp = row + (png_size_t)(row_width << 3) - 1; |
3593 | for (i = 0; i < row_width; i++) | |
c801d85f KB |
3594 | { |
3595 | if ((((png_uint_16)*(sp - 4) | | |
3596 | ((png_uint_16)*(sp - 5) << 8)) == trans_value->red) && | |
3597 | (((png_uint_16)*(sp - 2) | | |
3598 | ((png_uint_16)*(sp - 3) << 8)) == trans_value->green) && | |
3599 | (((png_uint_16)*(sp - 0) | | |
3600 | ((png_uint_16)*(sp - 1) << 8)) == trans_value->blue)) | |
3601 | { | |
3602 | *dp-- = 0; | |
3603 | *dp-- = 0; | |
3604 | } | |
3605 | else | |
3606 | { | |
3607 | *dp-- = 0xff; | |
3608 | *dp-- = 0xff; | |
3609 | } | |
3610 | *dp-- = *sp--; | |
3611 | *dp-- = *sp--; | |
3612 | *dp-- = *sp--; | |
3613 | *dp-- = *sp--; | |
3614 | *dp-- = *sp--; | |
3615 | *dp-- = *sp--; | |
3616 | } | |
3617 | } | |
3618 | row_info->color_type = PNG_COLOR_TYPE_RGB_ALPHA; | |
3619 | row_info->channels = 4; | |
3620 | row_info->pixel_depth = (png_byte)(row_info->bit_depth << 2); | |
3621 | row_info->rowbytes = | |
a626cc03 | 3622 | ((row_width * row_info->pixel_depth) >> 3); |
c801d85f KB |
3623 | } |
3624 | } | |
3625 | } | |
3626 | #endif | |
3627 | ||
3628 | #if defined(PNG_READ_DITHER_SUPPORTED) | |
3629 | void | |
3630 | png_do_dither(png_row_infop row_info, png_bytep row, | |
3631 | png_bytep palette_lookup, png_bytep dither_lookup) | |
3632 | { | |
3633 | png_bytep sp, dp; | |
3634 | png_uint_32 i; | |
a626cc03 | 3635 | png_uint_32 row_width=row_info->width; |
c801d85f KB |
3636 | |
3637 | png_debug(1, "in png_do_dither\n"); | |
3638 | #if defined(PNG_USELESS_TESTS_SUPPORTED) | |
3639 | if (row != NULL && row_info != NULL) | |
3640 | #endif | |
3641 | { | |
3642 | if (row_info->color_type == PNG_COLOR_TYPE_RGB && | |
3643 | palette_lookup && row_info->bit_depth == 8) | |
3644 | { | |
3645 | int r, g, b, p; | |
3646 | sp = row; | |
3647 | dp = row; | |
a626cc03 | 3648 | for (i = 0; i < row_width; i++) |
c801d85f KB |
3649 | { |
3650 | r = *sp++; | |
3651 | g = *sp++; | |
3652 | b = *sp++; | |
3653 | ||
3654 | /* this looks real messy, but the compiler will reduce | |
3655 | it down to a reasonable formula. For example, with | |
3656 | 5 bits per color, we get: | |
3657 | p = (((r >> 3) & 0x1f) << 10) | | |
3658 | (((g >> 3) & 0x1f) << 5) | | |
3659 | ((b >> 3) & 0x1f); | |
3660 | */ | |
3661 | p = (((r >> (8 - PNG_DITHER_RED_BITS)) & | |
3662 | ((1 << PNG_DITHER_RED_BITS) - 1)) << | |
3663 | (PNG_DITHER_GREEN_BITS + PNG_DITHER_BLUE_BITS)) | | |
3664 | (((g >> (8 - PNG_DITHER_GREEN_BITS)) & | |
3665 | ((1 << PNG_DITHER_GREEN_BITS) - 1)) << | |
3666 | (PNG_DITHER_BLUE_BITS)) | | |
3667 | ((b >> (8 - PNG_DITHER_BLUE_BITS)) & | |
3668 | ((1 << PNG_DITHER_BLUE_BITS) - 1)); | |
3669 | ||
3670 | *dp++ = palette_lookup[p]; | |
3671 | } | |
3672 | row_info->color_type = PNG_COLOR_TYPE_PALETTE; | |
3673 | row_info->channels = 1; | |
3674 | row_info->pixel_depth = row_info->bit_depth; | |
3675 | row_info->rowbytes = | |
a626cc03 | 3676 | ((row_width * row_info->pixel_depth + 7) >> 3); |
c801d85f KB |
3677 | } |
3678 | else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA && | |
3679 | palette_lookup != NULL && row_info->bit_depth == 8) | |
3680 | { | |
3681 | int r, g, b, p; | |
3682 | sp = row; | |
3683 | dp = row; | |
a626cc03 | 3684 | for (i = 0; i < row_width; i++) |
c801d85f KB |
3685 | { |
3686 | r = *sp++; | |
3687 | g = *sp++; | |
3688 | b = *sp++; | |
3689 | sp++; | |
3690 | ||
3691 | p = (((r >> (8 - PNG_DITHER_RED_BITS)) & | |
3692 | ((1 << PNG_DITHER_RED_BITS) - 1)) << | |
3693 | (PNG_DITHER_GREEN_BITS + PNG_DITHER_BLUE_BITS)) | | |
3694 | (((g >> (8 - PNG_DITHER_GREEN_BITS)) & | |
3695 | ((1 << PNG_DITHER_GREEN_BITS) - 1)) << | |
3696 | (PNG_DITHER_BLUE_BITS)) | | |
3697 | ((b >> (8 - PNG_DITHER_BLUE_BITS)) & | |
3698 | ((1 << PNG_DITHER_BLUE_BITS) - 1)); | |
3699 | ||
3700 | *dp++ = palette_lookup[p]; | |
3701 | } | |
3702 | row_info->color_type = PNG_COLOR_TYPE_PALETTE; | |
3703 | row_info->channels = 1; | |
3704 | row_info->pixel_depth = row_info->bit_depth; | |
3705 | row_info->rowbytes = | |
a626cc03 | 3706 | ((row_width * row_info->pixel_depth + 7) >> 3); |
c801d85f KB |
3707 | } |
3708 | else if (row_info->color_type == PNG_COLOR_TYPE_PALETTE && | |
3709 | dither_lookup && row_info->bit_depth == 8) | |
3710 | { | |
3711 | sp = row; | |
a626cc03 | 3712 | for (i = 0; i < row_width; i++, sp++) |
c801d85f KB |
3713 | { |
3714 | *sp = dither_lookup[*sp]; | |
3715 | } | |
3716 | } | |
3717 | } | |
3718 | } | |
3719 | #endif | |
3720 | ||
3721 | #if defined(PNG_READ_GAMMA_SUPPORTED) | |
3722 | static int png_gamma_shift[] = | |
3723 | {0x10, 0x21, 0x42, 0x84, 0x110, 0x248, 0x550, 0xff0}; | |
3724 | ||
3725 | /* We build the 8- or 16-bit gamma tables here. Note that for 16-bit | |
3726 | * tables, we don't make a full table if we are reducing to 8-bit in | |
3727 | * the future. Note also how the gamma_16 tables are segmented so that | |
3728 | * we don't need to allocate > 64K chunks for a full 16-bit table. | |
3729 | */ | |
3730 | void | |
3731 | png_build_gamma_table(png_structp png_ptr) | |
3732 | { | |
a626cc03 RR |
3733 | png_debug(1, "in png_build_gamma_table\n"); |
3734 | if(png_ptr->gamma != 0.0) | |
3735 | { | |
c801d85f KB |
3736 | if (png_ptr->bit_depth <= 8) |
3737 | { | |
3738 | int i; | |
3739 | double g; | |
3740 | ||
a626cc03 RR |
3741 | if (png_ptr->screen_gamma > .000001) |
3742 | g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma); | |
3743 | else | |
3744 | g = 1.0; | |
c801d85f KB |
3745 | |
3746 | png_ptr->gamma_table = (png_bytep)png_malloc(png_ptr, | |
3747 | (png_uint_32)256); | |
3748 | ||
3749 | for (i = 0; i < 256; i++) | |
3750 | { | |
3751 | png_ptr->gamma_table[i] = (png_byte)(pow((double)i / 255.0, | |
3752 | g) * 255.0 + .5); | |
3753 | } | |
3754 | ||
a626cc03 RR |
3755 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ |
3756 | defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) | |
3757 | if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY)) | |
c801d85f | 3758 | { |
a626cc03 | 3759 | |
c801d85f KB |
3760 | g = 1.0 / (png_ptr->gamma); |
3761 | ||
3762 | png_ptr->gamma_to_1 = (png_bytep)png_malloc(png_ptr, | |
3763 | (png_uint_32)256); | |
3764 | ||
3765 | for (i = 0; i < 256; i++) | |
3766 | { | |
3767 | png_ptr->gamma_to_1[i] = (png_byte)(pow((double)i / 255.0, | |
3768 | g) * 255.0 + .5); | |
3769 | } | |
3770 | ||
a626cc03 | 3771 | |
c801d85f KB |
3772 | png_ptr->gamma_from_1 = (png_bytep)png_malloc(png_ptr, |
3773 | (png_uint_32)256); | |
3774 | ||
a626cc03 RR |
3775 | if(png_ptr->screen_gamma > 0.000001) |
3776 | g = 1.0 / png_ptr->screen_gamma; | |
3777 | else | |
3778 | g = png_ptr->gamma; /* probably doing rgb_to_gray */ | |
3779 | ||
c801d85f KB |
3780 | for (i = 0; i < 256; i++) |
3781 | { | |
3782 | png_ptr->gamma_from_1[i] = (png_byte)(pow((double)i / 255.0, | |
3783 | g) * 255.0 + .5); | |
a626cc03 | 3784 | |
c801d85f KB |
3785 | } |
3786 | } | |
a626cc03 | 3787 | #endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */ |
c801d85f KB |
3788 | } |
3789 | else | |
3790 | { | |
3791 | double g; | |
3792 | int i, j, shift, num; | |
3793 | int sig_bit; | |
3794 | png_uint_32 ig; | |
3795 | ||
3796 | if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) | |
3797 | { | |
3798 | sig_bit = (int)png_ptr->sig_bit.red; | |
3799 | if ((int)png_ptr->sig_bit.green > sig_bit) | |
3800 | sig_bit = png_ptr->sig_bit.green; | |
3801 | if ((int)png_ptr->sig_bit.blue > sig_bit) | |
3802 | sig_bit = png_ptr->sig_bit.blue; | |
3803 | } | |
3804 | else | |
3805 | { | |
3806 | sig_bit = (int)png_ptr->sig_bit.gray; | |
3807 | } | |
3808 | ||
3809 | if (sig_bit > 0) | |
3810 | shift = 16 - sig_bit; | |
3811 | else | |
3812 | shift = 0; | |
3813 | ||
3814 | if (png_ptr->transformations & PNG_16_TO_8) | |
3815 | { | |
3816 | if (shift < (16 - PNG_MAX_GAMMA_8)) | |
3817 | shift = (16 - PNG_MAX_GAMMA_8); | |
3818 | } | |
3819 | ||
3820 | if (shift > 8) | |
3821 | shift = 8; | |
3822 | if (shift < 0) | |
3823 | shift = 0; | |
3824 | ||
3825 | png_ptr->gamma_shift = (png_byte)shift; | |
3826 | ||
3827 | num = (1 << (8 - shift)); | |
3828 | ||
a626cc03 RR |
3829 | if (png_ptr->screen_gamma > .000001) |
3830 | g = 1.0 / (png_ptr->gamma * png_ptr->screen_gamma); | |
3831 | else | |
3832 | g = 1.0; | |
c801d85f KB |
3833 | |
3834 | png_ptr->gamma_16_table = (png_uint_16pp)png_malloc(png_ptr, | |
3835 | (png_uint_32)(num * sizeof (png_uint_16p))); | |
3836 | ||
a626cc03 | 3837 | if (png_ptr->transformations & (PNG_16_TO_8 | PNG_BACKGROUND)) |
c801d85f KB |
3838 | { |
3839 | double fin, fout; | |
3840 | png_uint_32 last, max; | |
3841 | ||
3842 | for (i = 0; i < num; i++) | |
3843 | { | |
3844 | png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr, | |
3845 | (png_uint_32)(256 * sizeof (png_uint_16))); | |
3846 | } | |
3847 | ||
3848 | g = 1.0 / g; | |
3849 | last = 0; | |
3850 | for (i = 0; i < 256; i++) | |
3851 | { | |
3852 | fout = ((double)i + 0.5) / 256.0; | |
3853 | fin = pow(fout, g); | |
3854 | max = (png_uint_32)(fin * (double)((png_uint_32)num << 8)); | |
3855 | while (last <= max) | |
3856 | { | |
3857 | png_ptr->gamma_16_table[(int)(last & (0xff >> shift))] | |
3858 | [(int)(last >> (8 - shift))] = (png_uint_16)( | |
3859 | (png_uint_16)i | ((png_uint_16)i << 8)); | |
3860 | last++; | |
3861 | } | |
3862 | } | |
3863 | while (last < ((png_uint_32)num << 8)) | |
3864 | { | |
3865 | png_ptr->gamma_16_table[(int)(last & (0xff >> shift))] | |
3866 | [(int)(last >> (8 - shift))] = (png_uint_16)65535L; | |
3867 | last++; | |
3868 | } | |
3869 | } | |
3870 | else | |
3871 | { | |
3872 | for (i = 0; i < num; i++) | |
3873 | { | |
3874 | png_ptr->gamma_16_table[i] = (png_uint_16p)png_malloc(png_ptr, | |
3875 | (png_uint_32)(256 * sizeof (png_uint_16))); | |
3876 | ||
3877 | ig = (((png_uint_32)i * (png_uint_32)png_gamma_shift[shift]) >> 4); | |
3878 | for (j = 0; j < 256; j++) | |
3879 | { | |
3880 | png_ptr->gamma_16_table[i][j] = | |
3881 | (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) / | |
3882 | 65535.0, g) * 65535.0 + .5); | |
3883 | } | |
3884 | } | |
3885 | } | |
3886 | ||
a626cc03 RR |
3887 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ |
3888 | defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) | |
3889 | if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY)) | |
c801d85f | 3890 | { |
a626cc03 | 3891 | |
c801d85f KB |
3892 | g = 1.0 / (png_ptr->gamma); |
3893 | ||
3894 | png_ptr->gamma_16_to_1 = (png_uint_16pp)png_malloc(png_ptr, | |
3895 | (png_uint_32)(num * sizeof (png_uint_16p ))); | |
3896 | ||
3897 | for (i = 0; i < num; i++) | |
3898 | { | |
3899 | png_ptr->gamma_16_to_1[i] = (png_uint_16p)png_malloc(png_ptr, | |
3900 | (png_uint_32)(256 * sizeof (png_uint_16))); | |
3901 | ||
3902 | ig = (((png_uint_32)i * | |
3903 | (png_uint_32)png_gamma_shift[shift]) >> 4); | |
3904 | for (j = 0; j < 256; j++) | |
3905 | { | |
3906 | png_ptr->gamma_16_to_1[i][j] = | |
3907 | (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) / | |
3908 | 65535.0, g) * 65535.0 + .5); | |
3909 | } | |
3910 | } | |
a626cc03 RR |
3911 | |
3912 | if(png_ptr->screen_gamma > 0.000001) | |
3913 | g = 1.0 / png_ptr->screen_gamma; | |
3914 | else | |
3915 | g = png_ptr->gamma; /* probably doing rgb_to_gray */ | |
c801d85f KB |
3916 | |
3917 | png_ptr->gamma_16_from_1 = (png_uint_16pp)png_malloc(png_ptr, | |
3918 | (png_uint_32)(num * sizeof (png_uint_16p))); | |
3919 | ||
3920 | for (i = 0; i < num; i++) | |
3921 | { | |
3922 | png_ptr->gamma_16_from_1[i] = (png_uint_16p)png_malloc(png_ptr, | |
3923 | (png_uint_32)(256 * sizeof (png_uint_16))); | |
3924 | ||
3925 | ig = (((png_uint_32)i * | |
3926 | (png_uint_32)png_gamma_shift[shift]) >> 4); | |
3927 | for (j = 0; j < 256; j++) | |
3928 | { | |
3929 | png_ptr->gamma_16_from_1[i][j] = | |
3930 | (png_uint_16)(pow((double)(ig + ((png_uint_32)j << 8)) / | |
3931 | 65535.0, g) * 65535.0 + .5); | |
3932 | } | |
3933 | } | |
3934 | } | |
a626cc03 | 3935 | #endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_RGB_TO_GRAY_SUPPORTED */ |
c801d85f | 3936 | } |
a626cc03 | 3937 | } |
c801d85f KB |
3938 | } |
3939 | #endif | |
3940 |