/[pcsx2_0.9.7]/trunk/3rdparty/wxWidgets/src/png/pngwtran.c
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Revision 31 - (show annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (10 years, 1 month ago) by william
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committing r3113 initial commit again...
1
2 /* pngwtran.c - transforms the data in a row for PNG writers
3 *
4 * Last changed in libpng 1.2.37 [June 4, 2009]
5 * Copyright (c) 1998-2009 Glenn Randers-Pehrson
6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
8 *
9 * This code is released under the libpng license.
10 * For conditions of distribution and use, see the disclaimer
11 * and license in png.h
12 */
13
14 #define PNG_INTERNAL
15 #include "png.h"
16 #ifdef PNG_WRITE_SUPPORTED
17
18 /* Transform the data according to the user's wishes. The order of
19 * transformations is significant.
20 */
21 void /* PRIVATE */
22 png_do_write_transformations(png_structp png_ptr)
23 {
24 png_debug(1, "in png_do_write_transformations");
25
26 if (png_ptr == NULL)
27 return;
28
29 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
30 if (png_ptr->transformations & PNG_USER_TRANSFORM)
31 if (png_ptr->write_user_transform_fn != NULL)
32 (*(png_ptr->write_user_transform_fn)) /* User write transform function */
33 (png_ptr, /* png_ptr */
34 &(png_ptr->row_info), /* row_info: */
35 /* png_uint_32 width; width of row */
36 /* png_uint_32 rowbytes; number of bytes in row */
37 /* png_byte color_type; color type of pixels */
38 /* png_byte bit_depth; bit depth of samples */
39 /* png_byte channels; number of channels (1-4) */
40 /* png_byte pixel_depth; bits per pixel (depth*channels) */
41 png_ptr->row_buf + 1); /* start of pixel data for row */
42 #endif
43 #if defined(PNG_WRITE_FILLER_SUPPORTED)
44 if (png_ptr->transformations & PNG_FILLER)
45 png_do_strip_filler(&(png_ptr->row_info), png_ptr->row_buf + 1,
46 png_ptr->flags);
47 #endif
48 #if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
49 if (png_ptr->transformations & PNG_PACKSWAP)
50 png_do_packswap(&(png_ptr->row_info), png_ptr->row_buf + 1);
51 #endif
52 #if defined(PNG_WRITE_PACK_SUPPORTED)
53 if (png_ptr->transformations & PNG_PACK)
54 png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1,
55 (png_uint_32)png_ptr->bit_depth);
56 #endif
57 #if defined(PNG_WRITE_SWAP_SUPPORTED)
58 if (png_ptr->transformations & PNG_SWAP_BYTES)
59 png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
60 #endif
61 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
62 if (png_ptr->transformations & PNG_SHIFT)
63 png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1,
64 &(png_ptr->shift));
65 #endif
66 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
67 if (png_ptr->transformations & PNG_SWAP_ALPHA)
68 png_do_write_swap_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
69 #endif
70 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
71 if (png_ptr->transformations & PNG_INVERT_ALPHA)
72 png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
73 #endif
74 #if defined(PNG_WRITE_BGR_SUPPORTED)
75 if (png_ptr->transformations & PNG_BGR)
76 png_do_bgr(&(png_ptr->row_info), png_ptr->row_buf + 1);
77 #endif
78 #if defined(PNG_WRITE_INVERT_SUPPORTED)
79 if (png_ptr->transformations & PNG_INVERT_MONO)
80 png_do_invert(&(png_ptr->row_info), png_ptr->row_buf + 1);
81 #endif
82 }
83
84 #if defined(PNG_WRITE_PACK_SUPPORTED)
85 /* Pack pixels into bytes. Pass the true bit depth in bit_depth. The
86 * row_info bit depth should be 8 (one pixel per byte). The channels
87 * should be 1 (this only happens on grayscale and paletted images).
88 */
89 void /* PRIVATE */
90 png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
91 {
92 png_debug(1, "in png_do_pack");
93 if (row_info->bit_depth == 8 &&
94 #if defined(PNG_USELESS_TESTS_SUPPORTED)
95 row != NULL && row_info != NULL &&
96 #endif
97 row_info->channels == 1)
98 {
99 switch ((int)bit_depth)
100 {
101 case 1:
102 {
103 png_bytep sp, dp;
104 int mask, v;
105 png_uint_32 i;
106 png_uint_32 row_width = row_info->width;
107
108 sp = row;
109 dp = row;
110 mask = 0x80;
111 v = 0;
112
113 for (i = 0; i < row_width; i++)
114 {
115 if (*sp != 0)
116 v |= mask;
117 sp++;
118 if (mask > 1)
119 mask >>= 1;
120 else
121 {
122 mask = 0x80;
123 *dp = (png_byte)v;
124 dp++;
125 v = 0;
126 }
127 }
128 if (mask != 0x80)
129 *dp = (png_byte)v;
130 break;
131 }
132 case 2:
133 {
134 png_bytep sp, dp;
135 int shift, v;
136 png_uint_32 i;
137 png_uint_32 row_width = row_info->width;
138
139 sp = row;
140 dp = row;
141 shift = 6;
142 v = 0;
143 for (i = 0; i < row_width; i++)
144 {
145 png_byte value;
146
147 value = (png_byte)(*sp & 0x03);
148 v |= (value << shift);
149 if (shift == 0)
150 {
151 shift = 6;
152 *dp = (png_byte)v;
153 dp++;
154 v = 0;
155 }
156 else
157 shift -= 2;
158 sp++;
159 }
160 if (shift != 6)
161 *dp = (png_byte)v;
162 break;
163 }
164 case 4:
165 {
166 png_bytep sp, dp;
167 int shift, v;
168 png_uint_32 i;
169 png_uint_32 row_width = row_info->width;
170
171 sp = row;
172 dp = row;
173 shift = 4;
174 v = 0;
175 for (i = 0; i < row_width; i++)
176 {
177 png_byte value;
178
179 value = (png_byte)(*sp & 0x0f);
180 v |= (value << shift);
181
182 if (shift == 0)
183 {
184 shift = 4;
185 *dp = (png_byte)v;
186 dp++;
187 v = 0;
188 }
189 else
190 shift -= 4;
191
192 sp++;
193 }
194 if (shift != 4)
195 *dp = (png_byte)v;
196 break;
197 }
198 }
199 row_info->bit_depth = (png_byte)bit_depth;
200 row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels);
201 row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
202 row_info->width);
203 }
204 }
205 #endif
206
207 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
208 /* Shift pixel values to take advantage of whole range. Pass the
209 * true number of bits in bit_depth. The row should be packed
210 * according to row_info->bit_depth. Thus, if you had a row of
211 * bit depth 4, but the pixels only had values from 0 to 7, you
212 * would pass 3 as bit_depth, and this routine would translate the
213 * data to 0 to 15.
214 */
215 void /* PRIVATE */
216 png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
217 {
218 png_debug(1, "in png_do_shift");
219 #if defined(PNG_USELESS_TESTS_SUPPORTED)
220 if (row != NULL && row_info != NULL &&
221 #else
222 if (
223 #endif
224 row_info->color_type != PNG_COLOR_TYPE_PALETTE)
225 {
226 int shift_start[4], shift_dec[4];
227 int channels = 0;
228
229 if (row_info->color_type & PNG_COLOR_MASK_COLOR)
230 {
231 shift_start[channels] = row_info->bit_depth - bit_depth->red;
232 shift_dec[channels] = bit_depth->red;
233 channels++;
234 shift_start[channels] = row_info->bit_depth - bit_depth->green;
235 shift_dec[channels] = bit_depth->green;
236 channels++;
237 shift_start[channels] = row_info->bit_depth - bit_depth->blue;
238 shift_dec[channels] = bit_depth->blue;
239 channels++;
240 }
241 else
242 {
243 shift_start[channels] = row_info->bit_depth - bit_depth->gray;
244 shift_dec[channels] = bit_depth->gray;
245 channels++;
246 }
247 if (row_info->color_type & PNG_COLOR_MASK_ALPHA)
248 {
249 shift_start[channels] = row_info->bit_depth - bit_depth->alpha;
250 shift_dec[channels] = bit_depth->alpha;
251 channels++;
252 }
253
254 /* With low row depths, could only be grayscale, so one channel */
255 if (row_info->bit_depth < 8)
256 {
257 png_bytep bp = row;
258 png_uint_32 i;
259 png_byte mask;
260 png_uint_32 row_bytes = row_info->rowbytes;
261
262 if (bit_depth->gray == 1 && row_info->bit_depth == 2)
263 mask = 0x55;
264 else if (row_info->bit_depth == 4 && bit_depth->gray == 3)
265 mask = 0x11;
266 else
267 mask = 0xff;
268
269 for (i = 0; i < row_bytes; i++, bp++)
270 {
271 png_uint_16 v;
272 int j;
273
274 v = *bp;
275 *bp = 0;
276 for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0])
277 {
278 if (j > 0)
279 *bp |= (png_byte)((v << j) & 0xff);
280 else
281 *bp |= (png_byte)((v >> (-j)) & mask);
282 }
283 }
284 }
285 else if (row_info->bit_depth == 8)
286 {
287 png_bytep bp = row;
288 png_uint_32 i;
289 png_uint_32 istop = channels * row_info->width;
290
291 for (i = 0; i < istop; i++, bp++)
292 {
293
294 png_uint_16 v;
295 int j;
296 int c = (int)(i%channels);
297
298 v = *bp;
299 *bp = 0;
300 for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
301 {
302 if (j > 0)
303 *bp |= (png_byte)((v << j) & 0xff);
304 else
305 *bp |= (png_byte)((v >> (-j)) & 0xff);
306 }
307 }
308 }
309 else
310 {
311 png_bytep bp;
312 png_uint_32 i;
313 png_uint_32 istop = channels * row_info->width;
314
315 for (bp = row, i = 0; i < istop; i++)
316 {
317 int c = (int)(i%channels);
318 png_uint_16 value, v;
319 int j;
320
321 v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1));
322 value = 0;
323 for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
324 {
325 if (j > 0)
326 value |= (png_uint_16)((v << j) & (png_uint_16)0xffff);
327 else
328 value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff);
329 }
330 *bp++ = (png_byte)(value >> 8);
331 *bp++ = (png_byte)(value & 0xff);
332 }
333 }
334 }
335 }
336 #endif
337
338 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
339 void /* PRIVATE */
340 png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
341 {
342 png_debug(1, "in png_do_write_swap_alpha");
343 #if defined(PNG_USELESS_TESTS_SUPPORTED)
344 if (row != NULL && row_info != NULL)
345 #endif
346 {
347 if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
348 {
349 /* This converts from ARGB to RGBA */
350 if (row_info->bit_depth == 8)
351 {
352 png_bytep sp, dp;
353 png_uint_32 i;
354 png_uint_32 row_width = row_info->width;
355 for (i = 0, sp = dp = row; i < row_width; i++)
356 {
357 png_byte save = *(sp++);
358 *(dp++) = *(sp++);
359 *(dp++) = *(sp++);
360 *(dp++) = *(sp++);
361 *(dp++) = save;
362 }
363 }
364 /* This converts from AARRGGBB to RRGGBBAA */
365 else
366 {
367 png_bytep sp, dp;
368 png_uint_32 i;
369 png_uint_32 row_width = row_info->width;
370
371 for (i = 0, sp = dp = row; i < row_width; i++)
372 {
373 png_byte save[2];
374 save[0] = *(sp++);
375 save[1] = *(sp++);
376 *(dp++) = *(sp++);
377 *(dp++) = *(sp++);
378 *(dp++) = *(sp++);
379 *(dp++) = *(sp++);
380 *(dp++) = *(sp++);
381 *(dp++) = *(sp++);
382 *(dp++) = save[0];
383 *(dp++) = save[1];
384 }
385 }
386 }
387 else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
388 {
389 /* This converts from AG to GA */
390 if (row_info->bit_depth == 8)
391 {
392 png_bytep sp, dp;
393 png_uint_32 i;
394 png_uint_32 row_width = row_info->width;
395
396 for (i = 0, sp = dp = row; i < row_width; i++)
397 {
398 png_byte save = *(sp++);
399 *(dp++) = *(sp++);
400 *(dp++) = save;
401 }
402 }
403 /* This converts from AAGG to GGAA */
404 else
405 {
406 png_bytep sp, dp;
407 png_uint_32 i;
408 png_uint_32 row_width = row_info->width;
409
410 for (i = 0, sp = dp = row; i < row_width; i++)
411 {
412 png_byte save[2];
413 save[0] = *(sp++);
414 save[1] = *(sp++);
415 *(dp++) = *(sp++);
416 *(dp++) = *(sp++);
417 *(dp++) = save[0];
418 *(dp++) = save[1];
419 }
420 }
421 }
422 }
423 }
424 #endif
425
426 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
427 void /* PRIVATE */
428 png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
429 {
430 png_debug(1, "in png_do_write_invert_alpha");
431 #if defined(PNG_USELESS_TESTS_SUPPORTED)
432 if (row != NULL && row_info != NULL)
433 #endif
434 {
435 if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
436 {
437 /* This inverts the alpha channel in RGBA */
438 if (row_info->bit_depth == 8)
439 {
440 png_bytep sp, dp;
441 png_uint_32 i;
442 png_uint_32 row_width = row_info->width;
443 for (i = 0, sp = dp = row; i < row_width; i++)
444 {
445 /* Does nothing
446 *(dp++) = *(sp++);
447 *(dp++) = *(sp++);
448 *(dp++) = *(sp++);
449 */
450 sp+=3; dp = sp;
451 *(dp++) = (png_byte)(255 - *(sp++));
452 }
453 }
454 /* This inverts the alpha channel in RRGGBBAA */
455 else
456 {
457 png_bytep sp, dp;
458 png_uint_32 i;
459 png_uint_32 row_width = row_info->width;
460
461 for (i = 0, sp = dp = row; i < row_width; i++)
462 {
463 /* Does nothing
464 *(dp++) = *(sp++);
465 *(dp++) = *(sp++);
466 *(dp++) = *(sp++);
467 *(dp++) = *(sp++);
468 *(dp++) = *(sp++);
469 *(dp++) = *(sp++);
470 */
471 sp+=6; dp = sp;
472 *(dp++) = (png_byte)(255 - *(sp++));
473 *(dp++) = (png_byte)(255 - *(sp++));
474 }
475 }
476 }
477 else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
478 {
479 /* This inverts the alpha channel in GA */
480 if (row_info->bit_depth == 8)
481 {
482 png_bytep sp, dp;
483 png_uint_32 i;
484 png_uint_32 row_width = row_info->width;
485
486 for (i = 0, sp = dp = row; i < row_width; i++)
487 {
488 *(dp++) = *(sp++);
489 *(dp++) = (png_byte)(255 - *(sp++));
490 }
491 }
492 /* This inverts the alpha channel in GGAA */
493 else
494 {
495 png_bytep sp, dp;
496 png_uint_32 i;
497 png_uint_32 row_width = row_info->width;
498
499 for (i = 0, sp = dp = row; i < row_width; i++)
500 {
501 /* Does nothing
502 *(dp++) = *(sp++);
503 *(dp++) = *(sp++);
504 */
505 sp+=2; dp = sp;
506 *(dp++) = (png_byte)(255 - *(sp++));
507 *(dp++) = (png_byte)(255 - *(sp++));
508 }
509 }
510 }
511 }
512 }
513 #endif
514
515 #if defined(PNG_MNG_FEATURES_SUPPORTED)
516 /* Undoes intrapixel differencing */
517 void /* PRIVATE */
518 png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
519 {
520 png_debug(1, "in png_do_write_intrapixel");
521 if (
522 #if defined(PNG_USELESS_TESTS_SUPPORTED)
523 row != NULL && row_info != NULL &&
524 #endif
525 (row_info->color_type & PNG_COLOR_MASK_COLOR))
526 {
527 int bytes_per_pixel;
528 png_uint_32 row_width = row_info->width;
529 if (row_info->bit_depth == 8)
530 {
531 png_bytep rp;
532 png_uint_32 i;
533
534 if (row_info->color_type == PNG_COLOR_TYPE_RGB)
535 bytes_per_pixel = 3;
536 else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
537 bytes_per_pixel = 4;
538 else
539 return;
540
541 for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
542 {
543 *(rp) = (png_byte)((*rp - *(rp+1))&0xff);
544 *(rp+2) = (png_byte)((*(rp+2) - *(rp+1))&0xff);
545 }
546 }
547 else if (row_info->bit_depth == 16)
548 {
549 png_bytep rp;
550 png_uint_32 i;
551
552 if (row_info->color_type == PNG_COLOR_TYPE_RGB)
553 bytes_per_pixel = 6;
554 else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
555 bytes_per_pixel = 8;
556 else
557 return;
558
559 for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
560 {
561 png_uint_32 s0 = (*(rp ) << 8) | *(rp+1);
562 png_uint_32 s1 = (*(rp+2) << 8) | *(rp+3);
563 png_uint_32 s2 = (*(rp+4) << 8) | *(rp+5);
564 png_uint_32 red = (png_uint_32)((s0 - s1) & 0xffffL);
565 png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL);
566 *(rp ) = (png_byte)((red >> 8) & 0xff);
567 *(rp+1) = (png_byte)(red & 0xff);
568 *(rp+4) = (png_byte)((blue >> 8) & 0xff);
569 *(rp+5) = (png_byte)(blue & 0xff);
570 }
571 }
572 }
573 }
574 #endif /* PNG_MNG_FEATURES_SUPPORTED */
575 #endif /* PNG_WRITE_SUPPORTED */

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