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-rw-r--r--libraries/irrlicht-1.8/source/Irrlicht/libpng/pngwtran.c1266
1 files changed, 633 insertions, 633 deletions
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/pngwtran.c b/libraries/irrlicht-1.8/source/Irrlicht/libpng/pngwtran.c
index b598149..96608ef 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/pngwtran.c
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/pngwtran.c
@@ -1,633 +1,633 @@
1 1
2/* pngwtran.c - transforms the data in a row for PNG writers 2/* pngwtran.c - transforms the data in a row for PNG writers
3 * 3 *
4 * Last changed in libpng 1.5.6 [November 3, 2011] 4 * Last changed in libpng 1.5.6 [November 3, 2011]
5 * Copyright (c) 1998-2011 Glenn Randers-Pehrson 5 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
8 * 8 *
9 * This code is released under the libpng license. 9 * This code is released under the libpng license.
10 * For conditions of distribution and use, see the disclaimer 10 * For conditions of distribution and use, see the disclaimer
11 * and license in png.h 11 * and license in png.h
12 */ 12 */
13 13
14#include "pngpriv.h" 14#include "pngpriv.h"
15 15
16#ifdef PNG_WRITE_SUPPORTED 16#ifdef PNG_WRITE_SUPPORTED
17 17
18#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 18#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
19/* Transform the data according to the user's wishes. The order of 19/* Transform the data according to the user's wishes. The order of
20 * transformations is significant. 20 * transformations is significant.
21 */ 21 */
22void /* PRIVATE */ 22void /* PRIVATE */
23png_do_write_transformations(png_structp png_ptr, png_row_infop row_info) 23png_do_write_transformations(png_structp png_ptr, png_row_infop row_info)
24{ 24{
25 png_debug(1, "in png_do_write_transformations"); 25 png_debug(1, "in png_do_write_transformations");
26 26
27 if (png_ptr == NULL) 27 if (png_ptr == NULL)
28 return; 28 return;
29 29
30#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED 30#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
31 if (png_ptr->transformations & PNG_USER_TRANSFORM) 31 if (png_ptr->transformations & PNG_USER_TRANSFORM)
32 if (png_ptr->write_user_transform_fn != NULL) 32 if (png_ptr->write_user_transform_fn != NULL)
33 (*(png_ptr->write_user_transform_fn)) /* User write transform 33 (*(png_ptr->write_user_transform_fn)) /* User write transform
34 function */ 34 function */
35 (png_ptr, /* png_ptr */ 35 (png_ptr, /* png_ptr */
36 row_info, /* row_info: */ 36 row_info, /* row_info: */
37 /* png_uint_32 width; width of row */ 37 /* png_uint_32 width; width of row */
38 /* png_size_t rowbytes; number of bytes in row */ 38 /* png_size_t rowbytes; number of bytes in row */
39 /* png_byte color_type; color type of pixels */ 39 /* png_byte color_type; color type of pixels */
40 /* png_byte bit_depth; bit depth of samples */ 40 /* png_byte bit_depth; bit depth of samples */
41 /* png_byte channels; number of channels (1-4) */ 41 /* png_byte channels; number of channels (1-4) */
42 /* png_byte pixel_depth; bits per pixel (depth*channels) */ 42 /* png_byte pixel_depth; bits per pixel (depth*channels) */
43 png_ptr->row_buf + 1); /* start of pixel data for row */ 43 png_ptr->row_buf + 1); /* start of pixel data for row */
44#endif 44#endif
45 45
46#ifdef PNG_WRITE_FILLER_SUPPORTED 46#ifdef PNG_WRITE_FILLER_SUPPORTED
47 if (png_ptr->transformations & PNG_FILLER) 47 if (png_ptr->transformations & PNG_FILLER)
48 png_do_strip_channel(row_info, png_ptr->row_buf + 1, 48 png_do_strip_channel(row_info, png_ptr->row_buf + 1,
49 !(png_ptr->flags & PNG_FLAG_FILLER_AFTER)); 49 !(png_ptr->flags & PNG_FLAG_FILLER_AFTER));
50#endif 50#endif
51 51
52#ifdef PNG_WRITE_PACKSWAP_SUPPORTED 52#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
53 if (png_ptr->transformations & PNG_PACKSWAP) 53 if (png_ptr->transformations & PNG_PACKSWAP)
54 png_do_packswap(row_info, png_ptr->row_buf + 1); 54 png_do_packswap(row_info, png_ptr->row_buf + 1);
55#endif 55#endif
56 56
57#ifdef PNG_WRITE_PACK_SUPPORTED 57#ifdef PNG_WRITE_PACK_SUPPORTED
58 if (png_ptr->transformations & PNG_PACK) 58 if (png_ptr->transformations & PNG_PACK)
59 png_do_pack(row_info, png_ptr->row_buf + 1, 59 png_do_pack(row_info, png_ptr->row_buf + 1,
60 (png_uint_32)png_ptr->bit_depth); 60 (png_uint_32)png_ptr->bit_depth);
61#endif 61#endif
62 62
63#ifdef PNG_WRITE_SWAP_SUPPORTED 63#ifdef PNG_WRITE_SWAP_SUPPORTED
64 if (png_ptr->transformations & PNG_SWAP_BYTES) 64 if (png_ptr->transformations & PNG_SWAP_BYTES)
65 png_do_swap(row_info, png_ptr->row_buf + 1); 65 png_do_swap(row_info, png_ptr->row_buf + 1);
66#endif 66#endif
67 67
68#ifdef PNG_WRITE_SHIFT_SUPPORTED 68#ifdef PNG_WRITE_SHIFT_SUPPORTED
69 if (png_ptr->transformations & PNG_SHIFT) 69 if (png_ptr->transformations & PNG_SHIFT)
70 png_do_shift(row_info, png_ptr->row_buf + 1, 70 png_do_shift(row_info, png_ptr->row_buf + 1,
71 &(png_ptr->shift)); 71 &(png_ptr->shift));
72#endif 72#endif
73 73
74#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED 74#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
75 if (png_ptr->transformations & PNG_SWAP_ALPHA) 75 if (png_ptr->transformations & PNG_SWAP_ALPHA)
76 png_do_write_swap_alpha(row_info, png_ptr->row_buf + 1); 76 png_do_write_swap_alpha(row_info, png_ptr->row_buf + 1);
77#endif 77#endif
78 78
79#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED 79#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
80 if (png_ptr->transformations & PNG_INVERT_ALPHA) 80 if (png_ptr->transformations & PNG_INVERT_ALPHA)
81 png_do_write_invert_alpha(row_info, png_ptr->row_buf + 1); 81 png_do_write_invert_alpha(row_info, png_ptr->row_buf + 1);
82#endif 82#endif
83 83
84#ifdef PNG_WRITE_BGR_SUPPORTED 84#ifdef PNG_WRITE_BGR_SUPPORTED
85 if (png_ptr->transformations & PNG_BGR) 85 if (png_ptr->transformations & PNG_BGR)
86 png_do_bgr(row_info, png_ptr->row_buf + 1); 86 png_do_bgr(row_info, png_ptr->row_buf + 1);
87#endif 87#endif
88 88
89#ifdef PNG_WRITE_INVERT_SUPPORTED 89#ifdef PNG_WRITE_INVERT_SUPPORTED
90 if (png_ptr->transformations & PNG_INVERT_MONO) 90 if (png_ptr->transformations & PNG_INVERT_MONO)
91 png_do_invert(row_info, png_ptr->row_buf + 1); 91 png_do_invert(row_info, png_ptr->row_buf + 1);
92#endif 92#endif
93} 93}
94 94
95#ifdef PNG_WRITE_PACK_SUPPORTED 95#ifdef PNG_WRITE_PACK_SUPPORTED
96/* Pack pixels into bytes. Pass the true bit depth in bit_depth. The 96/* Pack pixels into bytes. Pass the true bit depth in bit_depth. The
97 * row_info bit depth should be 8 (one pixel per byte). The channels 97 * row_info bit depth should be 8 (one pixel per byte). The channels
98 * should be 1 (this only happens on grayscale and paletted images). 98 * should be 1 (this only happens on grayscale and paletted images).
99 */ 99 */
100void /* PRIVATE */ 100void /* PRIVATE */
101png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth) 101png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
102{ 102{
103 png_debug(1, "in png_do_pack"); 103 png_debug(1, "in png_do_pack");
104 104
105 if (row_info->bit_depth == 8 && 105 if (row_info->bit_depth == 8 &&
106 row_info->channels == 1) 106 row_info->channels == 1)
107 { 107 {
108 switch ((int)bit_depth) 108 switch ((int)bit_depth)
109 { 109 {
110 case 1: 110 case 1:
111 { 111 {
112 png_bytep sp, dp; 112 png_bytep sp, dp;
113 int mask, v; 113 int mask, v;
114 png_uint_32 i; 114 png_uint_32 i;
115 png_uint_32 row_width = row_info->width; 115 png_uint_32 row_width = row_info->width;
116 116
117 sp = row; 117 sp = row;
118 dp = row; 118 dp = row;
119 mask = 0x80; 119 mask = 0x80;
120 v = 0; 120 v = 0;
121 121
122 for (i = 0; i < row_width; i++) 122 for (i = 0; i < row_width; i++)
123 { 123 {
124 if (*sp != 0) 124 if (*sp != 0)
125 v |= mask; 125 v |= mask;
126 126
127 sp++; 127 sp++;
128 128
129 if (mask > 1) 129 if (mask > 1)
130 mask >>= 1; 130 mask >>= 1;
131 131
132 else 132 else
133 { 133 {
134 mask = 0x80; 134 mask = 0x80;
135 *dp = (png_byte)v; 135 *dp = (png_byte)v;
136 dp++; 136 dp++;
137 v = 0; 137 v = 0;
138 } 138 }
139 } 139 }
140 140
141 if (mask != 0x80) 141 if (mask != 0x80)
142 *dp = (png_byte)v; 142 *dp = (png_byte)v;
143 143
144 break; 144 break;
145 } 145 }
146 146
147 case 2: 147 case 2:
148 { 148 {
149 png_bytep sp, dp; 149 png_bytep sp, dp;
150 int shift, v; 150 int shift, v;
151 png_uint_32 i; 151 png_uint_32 i;
152 png_uint_32 row_width = row_info->width; 152 png_uint_32 row_width = row_info->width;
153 153
154 sp = row; 154 sp = row;
155 dp = row; 155 dp = row;
156 shift = 6; 156 shift = 6;
157 v = 0; 157 v = 0;
158 158
159 for (i = 0; i < row_width; i++) 159 for (i = 0; i < row_width; i++)
160 { 160 {
161 png_byte value; 161 png_byte value;
162 162
163 value = (png_byte)(*sp & 0x03); 163 value = (png_byte)(*sp & 0x03);
164 v |= (value << shift); 164 v |= (value << shift);
165 165
166 if (shift == 0) 166 if (shift == 0)
167 { 167 {
168 shift = 6; 168 shift = 6;
169 *dp = (png_byte)v; 169 *dp = (png_byte)v;
170 dp++; 170 dp++;
171 v = 0; 171 v = 0;
172 } 172 }
173 173
174 else 174 else
175 shift -= 2; 175 shift -= 2;
176 176
177 sp++; 177 sp++;
178 } 178 }
179 179
180 if (shift != 6) 180 if (shift != 6)
181 *dp = (png_byte)v; 181 *dp = (png_byte)v;
182 182
183 break; 183 break;
184 } 184 }
185 185
186 case 4: 186 case 4:
187 { 187 {
188 png_bytep sp, dp; 188 png_bytep sp, dp;
189 int shift, v; 189 int shift, v;
190 png_uint_32 i; 190 png_uint_32 i;
191 png_uint_32 row_width = row_info->width; 191 png_uint_32 row_width = row_info->width;
192 192
193 sp = row; 193 sp = row;
194 dp = row; 194 dp = row;
195 shift = 4; 195 shift = 4;
196 v = 0; 196 v = 0;
197 197
198 for (i = 0; i < row_width; i++) 198 for (i = 0; i < row_width; i++)
199 { 199 {
200 png_byte value; 200 png_byte value;
201 201
202 value = (png_byte)(*sp & 0x0f); 202 value = (png_byte)(*sp & 0x0f);
203 v |= (value << shift); 203 v |= (value << shift);
204 204
205 if (shift == 0) 205 if (shift == 0)
206 { 206 {
207 shift = 4; 207 shift = 4;
208 *dp = (png_byte)v; 208 *dp = (png_byte)v;
209 dp++; 209 dp++;
210 v = 0; 210 v = 0;
211 } 211 }
212 212
213 else 213 else
214 shift -= 4; 214 shift -= 4;
215 215
216 sp++; 216 sp++;
217 } 217 }
218 218
219 if (shift != 4) 219 if (shift != 4)
220 *dp = (png_byte)v; 220 *dp = (png_byte)v;
221 221
222 break; 222 break;
223 } 223 }
224 224
225 default: 225 default:
226 break; 226 break;
227 } 227 }
228 228
229 row_info->bit_depth = (png_byte)bit_depth; 229 row_info->bit_depth = (png_byte)bit_depth;
230 row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels); 230 row_info->pixel_depth = (png_byte)(bit_depth * row_info->channels);
231 row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth, 231 row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,
232 row_info->width); 232 row_info->width);
233 } 233 }
234} 234}
235#endif 235#endif
236 236
237#ifdef PNG_WRITE_SHIFT_SUPPORTED 237#ifdef PNG_WRITE_SHIFT_SUPPORTED
238/* Shift pixel values to take advantage of whole range. Pass the 238/* Shift pixel values to take advantage of whole range. Pass the
239 * true number of bits in bit_depth. The row should be packed 239 * true number of bits in bit_depth. The row should be packed
240 * according to row_info->bit_depth. Thus, if you had a row of 240 * according to row_info->bit_depth. Thus, if you had a row of
241 * bit depth 4, but the pixels only had values from 0 to 7, you 241 * bit depth 4, but the pixels only had values from 0 to 7, you
242 * would pass 3 as bit_depth, and this routine would translate the 242 * would pass 3 as bit_depth, and this routine would translate the
243 * data to 0 to 15. 243 * data to 0 to 15.
244 */ 244 */
245void /* PRIVATE */ 245void /* PRIVATE */
246png_do_shift(png_row_infop row_info, png_bytep row, 246png_do_shift(png_row_infop row_info, png_bytep row,
247 png_const_color_8p bit_depth) 247 png_const_color_8p bit_depth)
248{ 248{
249 png_debug(1, "in png_do_shift"); 249 png_debug(1, "in png_do_shift");
250 250
251 if (row_info->color_type != PNG_COLOR_TYPE_PALETTE) 251 if (row_info->color_type != PNG_COLOR_TYPE_PALETTE)
252 { 252 {
253 int shift_start[4], shift_dec[4]; 253 int shift_start[4], shift_dec[4];
254 int channels = 0; 254 int channels = 0;
255 255
256 if (row_info->color_type & PNG_COLOR_MASK_COLOR) 256 if (row_info->color_type & PNG_COLOR_MASK_COLOR)
257 { 257 {
258 shift_start[channels] = row_info->bit_depth - bit_depth->red; 258 shift_start[channels] = row_info->bit_depth - bit_depth->red;
259 shift_dec[channels] = bit_depth->red; 259 shift_dec[channels] = bit_depth->red;
260 channels++; 260 channels++;
261 261
262 shift_start[channels] = row_info->bit_depth - bit_depth->green; 262 shift_start[channels] = row_info->bit_depth - bit_depth->green;
263 shift_dec[channels] = bit_depth->green; 263 shift_dec[channels] = bit_depth->green;
264 channels++; 264 channels++;
265 265
266 shift_start[channels] = row_info->bit_depth - bit_depth->blue; 266 shift_start[channels] = row_info->bit_depth - bit_depth->blue;
267 shift_dec[channels] = bit_depth->blue; 267 shift_dec[channels] = bit_depth->blue;
268 channels++; 268 channels++;
269 } 269 }
270 270
271 else 271 else
272 { 272 {
273 shift_start[channels] = row_info->bit_depth - bit_depth->gray; 273 shift_start[channels] = row_info->bit_depth - bit_depth->gray;
274 shift_dec[channels] = bit_depth->gray; 274 shift_dec[channels] = bit_depth->gray;
275 channels++; 275 channels++;
276 } 276 }
277 277
278 if (row_info->color_type & PNG_COLOR_MASK_ALPHA) 278 if (row_info->color_type & PNG_COLOR_MASK_ALPHA)
279 { 279 {
280 shift_start[channels] = row_info->bit_depth - bit_depth->alpha; 280 shift_start[channels] = row_info->bit_depth - bit_depth->alpha;
281 shift_dec[channels] = bit_depth->alpha; 281 shift_dec[channels] = bit_depth->alpha;
282 channels++; 282 channels++;
283 } 283 }
284 284
285 /* With low row depths, could only be grayscale, so one channel */ 285 /* With low row depths, could only be grayscale, so one channel */
286 if (row_info->bit_depth < 8) 286 if (row_info->bit_depth < 8)
287 { 287 {
288 png_bytep bp = row; 288 png_bytep bp = row;
289 png_size_t i; 289 png_size_t i;
290 png_byte mask; 290 png_byte mask;
291 png_size_t row_bytes = row_info->rowbytes; 291 png_size_t row_bytes = row_info->rowbytes;
292 292
293 if (bit_depth->gray == 1 && row_info->bit_depth == 2) 293 if (bit_depth->gray == 1 && row_info->bit_depth == 2)
294 mask = 0x55; 294 mask = 0x55;
295 295
296 else if (row_info->bit_depth == 4 && bit_depth->gray == 3) 296 else if (row_info->bit_depth == 4 && bit_depth->gray == 3)
297 mask = 0x11; 297 mask = 0x11;
298 298
299 else 299 else
300 mask = 0xff; 300 mask = 0xff;
301 301
302 for (i = 0; i < row_bytes; i++, bp++) 302 for (i = 0; i < row_bytes; i++, bp++)
303 { 303 {
304 png_uint_16 v; 304 png_uint_16 v;
305 int j; 305 int j;
306 306
307 v = *bp; 307 v = *bp;
308 *bp = 0; 308 *bp = 0;
309 309
310 for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0]) 310 for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0])
311 { 311 {
312 if (j > 0) 312 if (j > 0)
313 *bp |= (png_byte)((v << j) & 0xff); 313 *bp |= (png_byte)((v << j) & 0xff);
314 314
315 else 315 else
316 *bp |= (png_byte)((v >> (-j)) & mask); 316 *bp |= (png_byte)((v >> (-j)) & mask);
317 } 317 }
318 } 318 }
319 } 319 }
320 320
321 else if (row_info->bit_depth == 8) 321 else if (row_info->bit_depth == 8)
322 { 322 {
323 png_bytep bp = row; 323 png_bytep bp = row;
324 png_uint_32 i; 324 png_uint_32 i;
325 png_uint_32 istop = channels * row_info->width; 325 png_uint_32 istop = channels * row_info->width;
326 326
327 for (i = 0; i < istop; i++, bp++) 327 for (i = 0; i < istop; i++, bp++)
328 { 328 {
329 329
330 png_uint_16 v; 330 png_uint_16 v;
331 int j; 331 int j;
332 int c = (int)(i%channels); 332 int c = (int)(i%channels);
333 333
334 v = *bp; 334 v = *bp;
335 *bp = 0; 335 *bp = 0;
336 336
337 for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) 337 for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
338 { 338 {
339 if (j > 0) 339 if (j > 0)
340 *bp |= (png_byte)((v << j) & 0xff); 340 *bp |= (png_byte)((v << j) & 0xff);
341 341
342 else 342 else
343 *bp |= (png_byte)((v >> (-j)) & 0xff); 343 *bp |= (png_byte)((v >> (-j)) & 0xff);
344 } 344 }
345 } 345 }
346 } 346 }
347 347
348 else 348 else
349 { 349 {
350 png_bytep bp; 350 png_bytep bp;
351 png_uint_32 i; 351 png_uint_32 i;
352 png_uint_32 istop = channels * row_info->width; 352 png_uint_32 istop = channels * row_info->width;
353 353
354 for (bp = row, i = 0; i < istop; i++) 354 for (bp = row, i = 0; i < istop; i++)
355 { 355 {
356 int c = (int)(i%channels); 356 int c = (int)(i%channels);
357 png_uint_16 value, v; 357 png_uint_16 value, v;
358 int j; 358 int j;
359 359
360 v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1)); 360 v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1));
361 value = 0; 361 value = 0;
362 362
363 for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) 363 for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
364 { 364 {
365 if (j > 0) 365 if (j > 0)
366 value |= (png_uint_16)((v << j) & (png_uint_16)0xffff); 366 value |= (png_uint_16)((v << j) & (png_uint_16)0xffff);
367 367
368 else 368 else
369 value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff); 369 value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff);
370 } 370 }
371 *bp++ = (png_byte)(value >> 8); 371 *bp++ = (png_byte)(value >> 8);
372 *bp++ = (png_byte)(value & 0xff); 372 *bp++ = (png_byte)(value & 0xff);
373 } 373 }
374 } 374 }
375 } 375 }
376} 376}
377#endif 377#endif
378 378
379#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED 379#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
380void /* PRIVATE */ 380void /* PRIVATE */
381png_do_write_swap_alpha(png_row_infop row_info, png_bytep row) 381png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
382{ 382{
383 png_debug(1, "in png_do_write_swap_alpha"); 383 png_debug(1, "in png_do_write_swap_alpha");
384 384
385 { 385 {
386 if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) 386 if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
387 { 387 {
388 if (row_info->bit_depth == 8) 388 if (row_info->bit_depth == 8)
389 { 389 {
390 /* This converts from ARGB to RGBA */ 390 /* This converts from ARGB to RGBA */
391 png_bytep sp, dp; 391 png_bytep sp, dp;
392 png_uint_32 i; 392 png_uint_32 i;
393 png_uint_32 row_width = row_info->width; 393 png_uint_32 row_width = row_info->width;
394 394
395 for (i = 0, sp = dp = row; i < row_width; i++) 395 for (i = 0, sp = dp = row; i < row_width; i++)
396 { 396 {
397 png_byte save = *(sp++); 397 png_byte save = *(sp++);
398 *(dp++) = *(sp++); 398 *(dp++) = *(sp++);
399 *(dp++) = *(sp++); 399 *(dp++) = *(sp++);
400 *(dp++) = *(sp++); 400 *(dp++) = *(sp++);
401 *(dp++) = save; 401 *(dp++) = save;
402 } 402 }
403 } 403 }
404 404
405#ifdef PNG_WRITE_16BIT_SUPPORTED 405#ifdef PNG_WRITE_16BIT_SUPPORTED
406 else 406 else
407 { 407 {
408 /* This converts from AARRGGBB to RRGGBBAA */ 408 /* This converts from AARRGGBB to RRGGBBAA */
409 png_bytep sp, dp; 409 png_bytep sp, dp;
410 png_uint_32 i; 410 png_uint_32 i;
411 png_uint_32 row_width = row_info->width; 411 png_uint_32 row_width = row_info->width;
412 412
413 for (i = 0, sp = dp = row; i < row_width; i++) 413 for (i = 0, sp = dp = row; i < row_width; i++)
414 { 414 {
415 png_byte save[2]; 415 png_byte save[2];
416 save[0] = *(sp++); 416 save[0] = *(sp++);
417 save[1] = *(sp++); 417 save[1] = *(sp++);
418 *(dp++) = *(sp++); 418 *(dp++) = *(sp++);
419 *(dp++) = *(sp++); 419 *(dp++) = *(sp++);
420 *(dp++) = *(sp++); 420 *(dp++) = *(sp++);
421 *(dp++) = *(sp++); 421 *(dp++) = *(sp++);
422 *(dp++) = *(sp++); 422 *(dp++) = *(sp++);
423 *(dp++) = *(sp++); 423 *(dp++) = *(sp++);
424 *(dp++) = save[0]; 424 *(dp++) = save[0];
425 *(dp++) = save[1]; 425 *(dp++) = save[1];
426 } 426 }
427 } 427 }
428#endif /* PNG_WRITE_16BIT_SUPPORTED */ 428#endif /* PNG_WRITE_16BIT_SUPPORTED */
429 } 429 }
430 430
431 else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) 431 else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
432 { 432 {
433 if (row_info->bit_depth == 8) 433 if (row_info->bit_depth == 8)
434 { 434 {
435 /* This converts from AG to GA */ 435 /* This converts from AG to GA */
436 png_bytep sp, dp; 436 png_bytep sp, dp;
437 png_uint_32 i; 437 png_uint_32 i;
438 png_uint_32 row_width = row_info->width; 438 png_uint_32 row_width = row_info->width;
439 439
440 for (i = 0, sp = dp = row; i < row_width; i++) 440 for (i = 0, sp = dp = row; i < row_width; i++)
441 { 441 {
442 png_byte save = *(sp++); 442 png_byte save = *(sp++);
443 *(dp++) = *(sp++); 443 *(dp++) = *(sp++);
444 *(dp++) = save; 444 *(dp++) = save;
445 } 445 }
446 } 446 }
447 447
448#ifdef PNG_WRITE_16BIT_SUPPORTED 448#ifdef PNG_WRITE_16BIT_SUPPORTED
449 else 449 else
450 { 450 {
451 /* This converts from AAGG to GGAA */ 451 /* This converts from AAGG to GGAA */
452 png_bytep sp, dp; 452 png_bytep sp, dp;
453 png_uint_32 i; 453 png_uint_32 i;
454 png_uint_32 row_width = row_info->width; 454 png_uint_32 row_width = row_info->width;
455 455
456 for (i = 0, sp = dp = row; i < row_width; i++) 456 for (i = 0, sp = dp = row; i < row_width; i++)
457 { 457 {
458 png_byte save[2]; 458 png_byte save[2];
459 save[0] = *(sp++); 459 save[0] = *(sp++);
460 save[1] = *(sp++); 460 save[1] = *(sp++);
461 *(dp++) = *(sp++); 461 *(dp++) = *(sp++);
462 *(dp++) = *(sp++); 462 *(dp++) = *(sp++);
463 *(dp++) = save[0]; 463 *(dp++) = save[0];
464 *(dp++) = save[1]; 464 *(dp++) = save[1];
465 } 465 }
466 } 466 }
467#endif /* PNG_WRITE_16BIT_SUPPORTED */ 467#endif /* PNG_WRITE_16BIT_SUPPORTED */
468 } 468 }
469 } 469 }
470} 470}
471#endif 471#endif
472 472
473#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED 473#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
474void /* PRIVATE */ 474void /* PRIVATE */
475png_do_write_invert_alpha(png_row_infop row_info, png_bytep row) 475png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
476{ 476{
477 png_debug(1, "in png_do_write_invert_alpha"); 477 png_debug(1, "in png_do_write_invert_alpha");
478 478
479 { 479 {
480 if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) 480 if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
481 { 481 {
482 if (row_info->bit_depth == 8) 482 if (row_info->bit_depth == 8)
483 { 483 {
484 /* This inverts the alpha channel in RGBA */ 484 /* This inverts the alpha channel in RGBA */
485 png_bytep sp, dp; 485 png_bytep sp, dp;
486 png_uint_32 i; 486 png_uint_32 i;
487 png_uint_32 row_width = row_info->width; 487 png_uint_32 row_width = row_info->width;
488 488
489 for (i = 0, sp = dp = row; i < row_width; i++) 489 for (i = 0, sp = dp = row; i < row_width; i++)
490 { 490 {
491 /* Does nothing 491 /* Does nothing
492 *(dp++) = *(sp++); 492 *(dp++) = *(sp++);
493 *(dp++) = *(sp++); 493 *(dp++) = *(sp++);
494 *(dp++) = *(sp++); 494 *(dp++) = *(sp++);
495 */ 495 */
496 sp+=3; dp = sp; 496 sp+=3; dp = sp;
497 *(dp++) = (png_byte)(255 - *(sp++)); 497 *(dp++) = (png_byte)(255 - *(sp++));
498 } 498 }
499 } 499 }
500 500
501#ifdef PNG_WRITE_16BIT_SUPPORTED 501#ifdef PNG_WRITE_16BIT_SUPPORTED
502 else 502 else
503 { 503 {
504 /* This inverts the alpha channel in RRGGBBAA */ 504 /* This inverts the alpha channel in RRGGBBAA */
505 png_bytep sp, dp; 505 png_bytep sp, dp;
506 png_uint_32 i; 506 png_uint_32 i;
507 png_uint_32 row_width = row_info->width; 507 png_uint_32 row_width = row_info->width;
508 508
509 for (i = 0, sp = dp = row; i < row_width; i++) 509 for (i = 0, sp = dp = row; i < row_width; i++)
510 { 510 {
511 /* Does nothing 511 /* Does nothing
512 *(dp++) = *(sp++); 512 *(dp++) = *(sp++);
513 *(dp++) = *(sp++); 513 *(dp++) = *(sp++);
514 *(dp++) = *(sp++); 514 *(dp++) = *(sp++);
515 *(dp++) = *(sp++); 515 *(dp++) = *(sp++);
516 *(dp++) = *(sp++); 516 *(dp++) = *(sp++);
517 *(dp++) = *(sp++); 517 *(dp++) = *(sp++);
518 */ 518 */
519 sp+=6; dp = sp; 519 sp+=6; dp = sp;
520 *(dp++) = (png_byte)(255 - *(sp++)); 520 *(dp++) = (png_byte)(255 - *(sp++));
521 *(dp++) = (png_byte)(255 - *(sp++)); 521 *(dp++) = (png_byte)(255 - *(sp++));
522 } 522 }
523 } 523 }
524#endif /* PNG_WRITE_16BIT_SUPPORTED */ 524#endif /* PNG_WRITE_16BIT_SUPPORTED */
525 } 525 }
526 526
527 else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) 527 else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
528 { 528 {
529 if (row_info->bit_depth == 8) 529 if (row_info->bit_depth == 8)
530 { 530 {
531 /* This inverts the alpha channel in GA */ 531 /* This inverts the alpha channel in GA */
532 png_bytep sp, dp; 532 png_bytep sp, dp;
533 png_uint_32 i; 533 png_uint_32 i;
534 png_uint_32 row_width = row_info->width; 534 png_uint_32 row_width = row_info->width;
535 535
536 for (i = 0, sp = dp = row; i < row_width; i++) 536 for (i = 0, sp = dp = row; i < row_width; i++)
537 { 537 {
538 *(dp++) = *(sp++); 538 *(dp++) = *(sp++);
539 *(dp++) = (png_byte)(255 - *(sp++)); 539 *(dp++) = (png_byte)(255 - *(sp++));
540 } 540 }
541 } 541 }
542 542
543#ifdef PNG_WRITE_16BIT_SUPPORTED 543#ifdef PNG_WRITE_16BIT_SUPPORTED
544 else 544 else
545 { 545 {
546 /* This inverts the alpha channel in GGAA */ 546 /* This inverts the alpha channel in GGAA */
547 png_bytep sp, dp; 547 png_bytep sp, dp;
548 png_uint_32 i; 548 png_uint_32 i;
549 png_uint_32 row_width = row_info->width; 549 png_uint_32 row_width = row_info->width;
550 550
551 for (i = 0, sp = dp = row; i < row_width; i++) 551 for (i = 0, sp = dp = row; i < row_width; i++)
552 { 552 {
553 /* Does nothing 553 /* Does nothing
554 *(dp++) = *(sp++); 554 *(dp++) = *(sp++);
555 *(dp++) = *(sp++); 555 *(dp++) = *(sp++);
556 */ 556 */
557 sp+=2; dp = sp; 557 sp+=2; dp = sp;
558 *(dp++) = (png_byte)(255 - *(sp++)); 558 *(dp++) = (png_byte)(255 - *(sp++));
559 *(dp++) = (png_byte)(255 - *(sp++)); 559 *(dp++) = (png_byte)(255 - *(sp++));
560 } 560 }
561 } 561 }
562#endif /* PNG_WRITE_16BIT_SUPPORTED */ 562#endif /* PNG_WRITE_16BIT_SUPPORTED */
563 } 563 }
564 } 564 }
565} 565}
566#endif 566#endif
567#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */ 567#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */
568 568
569#ifdef PNG_MNG_FEATURES_SUPPORTED 569#ifdef PNG_MNG_FEATURES_SUPPORTED
570/* Undoes intrapixel differencing */ 570/* Undoes intrapixel differencing */
571void /* PRIVATE */ 571void /* PRIVATE */
572png_do_write_intrapixel(png_row_infop row_info, png_bytep row) 572png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
573{ 573{
574 png_debug(1, "in png_do_write_intrapixel"); 574 png_debug(1, "in png_do_write_intrapixel");
575 575
576 if ((row_info->color_type & PNG_COLOR_MASK_COLOR)) 576 if ((row_info->color_type & PNG_COLOR_MASK_COLOR))
577 { 577 {
578 int bytes_per_pixel; 578 int bytes_per_pixel;
579 png_uint_32 row_width = row_info->width; 579 png_uint_32 row_width = row_info->width;
580 if (row_info->bit_depth == 8) 580 if (row_info->bit_depth == 8)
581 { 581 {
582 png_bytep rp; 582 png_bytep rp;
583 png_uint_32 i; 583 png_uint_32 i;
584 584
585 if (row_info->color_type == PNG_COLOR_TYPE_RGB) 585 if (row_info->color_type == PNG_COLOR_TYPE_RGB)
586 bytes_per_pixel = 3; 586 bytes_per_pixel = 3;
587 587
588 else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) 588 else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
589 bytes_per_pixel = 4; 589 bytes_per_pixel = 4;
590 590
591 else 591 else
592 return; 592 return;
593 593
594 for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) 594 for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
595 { 595 {
596 *(rp) = (png_byte)((*rp - *(rp + 1)) & 0xff); 596 *(rp) = (png_byte)((*rp - *(rp + 1)) & 0xff);
597 *(rp + 2) = (png_byte)((*(rp + 2) - *(rp + 1)) & 0xff); 597 *(rp + 2) = (png_byte)((*(rp + 2) - *(rp + 1)) & 0xff);
598 } 598 }
599 } 599 }
600 600
601#ifdef PNG_WRITE_16BIT_SUPPORTED 601#ifdef PNG_WRITE_16BIT_SUPPORTED
602 else if (row_info->bit_depth == 16) 602 else if (row_info->bit_depth == 16)
603 { 603 {
604 png_bytep rp; 604 png_bytep rp;
605 png_uint_32 i; 605 png_uint_32 i;
606 606
607 if (row_info->color_type == PNG_COLOR_TYPE_RGB) 607 if (row_info->color_type == PNG_COLOR_TYPE_RGB)
608 bytes_per_pixel = 6; 608 bytes_per_pixel = 6;
609 609
610 else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA) 610 else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
611 bytes_per_pixel = 8; 611 bytes_per_pixel = 8;
612 612
613 else 613 else
614 return; 614 return;
615 615
616 for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel) 616 for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
617 { 617 {
618 png_uint_32 s0 = (*(rp ) << 8) | *(rp + 1); 618 png_uint_32 s0 = (*(rp ) << 8) | *(rp + 1);
619 png_uint_32 s1 = (*(rp + 2) << 8) | *(rp + 3); 619 png_uint_32 s1 = (*(rp + 2) << 8) | *(rp + 3);
620 png_uint_32 s2 = (*(rp + 4) << 8) | *(rp + 5); 620 png_uint_32 s2 = (*(rp + 4) << 8) | *(rp + 5);
621 png_uint_32 red = (png_uint_32)((s0 - s1) & 0xffffL); 621 png_uint_32 red = (png_uint_32)((s0 - s1) & 0xffffL);
622 png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL); 622 png_uint_32 blue = (png_uint_32)((s2 - s1) & 0xffffL);
623 *(rp ) = (png_byte)((red >> 8) & 0xff); 623 *(rp ) = (png_byte)((red >> 8) & 0xff);
624 *(rp + 1) = (png_byte)(red & 0xff); 624 *(rp + 1) = (png_byte)(red & 0xff);
625 *(rp + 4) = (png_byte)((blue >> 8) & 0xff); 625 *(rp + 4) = (png_byte)((blue >> 8) & 0xff);
626 *(rp + 5) = (png_byte)(blue & 0xff); 626 *(rp + 5) = (png_byte)(blue & 0xff);
627 } 627 }
628 } 628 }
629#endif /* PNG_WRITE_16BIT_SUPPORTED */ 629#endif /* PNG_WRITE_16BIT_SUPPORTED */
630 } 630 }
631} 631}
632#endif /* PNG_MNG_FEATURES_SUPPORTED */ 632#endif /* PNG_MNG_FEATURES_SUPPORTED */
633#endif /* PNG_WRITE_SUPPORTED */ 633#endif /* PNG_WRITE_SUPPORTED */
generated by cgit v1.1 at 2024-11-03 23:04:33 +0000