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annotate libs/libpng/pngwrite.c @ 20:2b85d05df3f2

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animation controls for easier screenshot grabbing
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 02 Oct 2015 04:54:55 +0300
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children
rev   line source
nuclear@2 1
nuclear@2 2 /* pngwrite.c - general routines to write a PNG file
nuclear@2 3 *
nuclear@2 4 * Last changed in libpng 1.2.31 [August 19, 2008]
nuclear@2 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@2 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@2 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@2 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@2 9 */
nuclear@2 10
nuclear@2 11 /* get internal access to png.h */
nuclear@2 12 #define PNG_INTERNAL
nuclear@2 13 #include "png.h"
nuclear@2 14 #ifdef PNG_WRITE_SUPPORTED
nuclear@2 15
nuclear@2 16 /* Writes all the PNG information. This is the suggested way to use the
nuclear@2 17 * library. If you have a new chunk to add, make a function to write it,
nuclear@2 18 * and put it in the correct location here. If you want the chunk written
nuclear@2 19 * after the image data, put it in png_write_end(). I strongly encourage
nuclear@2 20 * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
nuclear@2 21 * the chunk, as that will keep the code from breaking if you want to just
nuclear@2 22 * write a plain PNG file. If you have long comments, I suggest writing
nuclear@2 23 * them in png_write_end(), and compressing them.
nuclear@2 24 */
nuclear@2 25 void PNGAPI
nuclear@2 26 png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
nuclear@2 27 {
nuclear@2 28 png_debug(1, "in png_write_info_before_PLTE\n");
nuclear@2 29 if (png_ptr == NULL || info_ptr == NULL)
nuclear@2 30 return;
nuclear@2 31 if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
nuclear@2 32 {
nuclear@2 33 png_write_sig(png_ptr); /* write PNG signature */
nuclear@2 34 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@2 35 if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
nuclear@2 36 {
nuclear@2 37 png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
nuclear@2 38 png_ptr->mng_features_permitted=0;
nuclear@2 39 }
nuclear@2 40 #endif
nuclear@2 41 /* write IHDR information. */
nuclear@2 42 png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
nuclear@2 43 info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
nuclear@2 44 info_ptr->filter_type,
nuclear@2 45 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@2 46 info_ptr->interlace_type);
nuclear@2 47 #else
nuclear@2 48 0);
nuclear@2 49 #endif
nuclear@2 50 /* the rest of these check to see if the valid field has the appropriate
nuclear@2 51 flag set, and if it does, writes the chunk. */
nuclear@2 52 #if defined(PNG_WRITE_gAMA_SUPPORTED)
nuclear@2 53 if (info_ptr->valid & PNG_INFO_gAMA)
nuclear@2 54 {
nuclear@2 55 # ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@2 56 png_write_gAMA(png_ptr, info_ptr->gamma);
nuclear@2 57 #else
nuclear@2 58 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@2 59 png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
nuclear@2 60 # endif
nuclear@2 61 #endif
nuclear@2 62 }
nuclear@2 63 #endif
nuclear@2 64 #if defined(PNG_WRITE_sRGB_SUPPORTED)
nuclear@2 65 if (info_ptr->valid & PNG_INFO_sRGB)
nuclear@2 66 png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
nuclear@2 67 #endif
nuclear@2 68 #if defined(PNG_WRITE_iCCP_SUPPORTED)
nuclear@2 69 if (info_ptr->valid & PNG_INFO_iCCP)
nuclear@2 70 png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
nuclear@2 71 info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
nuclear@2 72 #endif
nuclear@2 73 #if defined(PNG_WRITE_sBIT_SUPPORTED)
nuclear@2 74 if (info_ptr->valid & PNG_INFO_sBIT)
nuclear@2 75 png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
nuclear@2 76 #endif
nuclear@2 77 #if defined(PNG_WRITE_cHRM_SUPPORTED)
nuclear@2 78 if (info_ptr->valid & PNG_INFO_cHRM)
nuclear@2 79 {
nuclear@2 80 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@2 81 png_write_cHRM(png_ptr,
nuclear@2 82 info_ptr->x_white, info_ptr->y_white,
nuclear@2 83 info_ptr->x_red, info_ptr->y_red,
nuclear@2 84 info_ptr->x_green, info_ptr->y_green,
nuclear@2 85 info_ptr->x_blue, info_ptr->y_blue);
nuclear@2 86 #else
nuclear@2 87 # ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@2 88 png_write_cHRM_fixed(png_ptr,
nuclear@2 89 info_ptr->int_x_white, info_ptr->int_y_white,
nuclear@2 90 info_ptr->int_x_red, info_ptr->int_y_red,
nuclear@2 91 info_ptr->int_x_green, info_ptr->int_y_green,
nuclear@2 92 info_ptr->int_x_blue, info_ptr->int_y_blue);
nuclear@2 93 # endif
nuclear@2 94 #endif
nuclear@2 95 }
nuclear@2 96 #endif
nuclear@2 97 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@2 98 if (info_ptr->unknown_chunks_num)
nuclear@2 99 {
nuclear@2 100 png_unknown_chunk *up;
nuclear@2 101
nuclear@2 102 png_debug(5, "writing extra chunks\n");
nuclear@2 103
nuclear@2 104 for (up = info_ptr->unknown_chunks;
nuclear@2 105 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
nuclear@2 106 up++)
nuclear@2 107 {
nuclear@2 108 int keep=png_handle_as_unknown(png_ptr, up->name);
nuclear@2 109 if (keep != PNG_HANDLE_CHUNK_NEVER &&
nuclear@2 110 up->location && !(up->location & PNG_HAVE_PLTE) &&
nuclear@2 111 !(up->location & PNG_HAVE_IDAT) &&
nuclear@2 112 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
nuclear@2 113 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
nuclear@2 114 {
nuclear@2 115 if (up->size == 0)
nuclear@2 116 png_warning(png_ptr, "Writing zero-length unknown chunk");
nuclear@2 117 png_write_chunk(png_ptr, up->name, up->data, up->size);
nuclear@2 118 }
nuclear@2 119 }
nuclear@2 120 }
nuclear@2 121 #endif
nuclear@2 122 png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
nuclear@2 123 }
nuclear@2 124 }
nuclear@2 125
nuclear@2 126 void PNGAPI
nuclear@2 127 png_write_info(png_structp png_ptr, png_infop info_ptr)
nuclear@2 128 {
nuclear@2 129 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
nuclear@2 130 int i;
nuclear@2 131 #endif
nuclear@2 132
nuclear@2 133 png_debug(1, "in png_write_info\n");
nuclear@2 134
nuclear@2 135 if (png_ptr == NULL || info_ptr == NULL)
nuclear@2 136 return;
nuclear@2 137
nuclear@2 138 png_write_info_before_PLTE(png_ptr, info_ptr);
nuclear@2 139
nuclear@2 140 if (info_ptr->valid & PNG_INFO_PLTE)
nuclear@2 141 png_write_PLTE(png_ptr, info_ptr->palette,
nuclear@2 142 (png_uint_32)info_ptr->num_palette);
nuclear@2 143 else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@2 144 png_error(png_ptr, "Valid palette required for paletted images");
nuclear@2 145
nuclear@2 146 #if defined(PNG_WRITE_tRNS_SUPPORTED)
nuclear@2 147 if (info_ptr->valid & PNG_INFO_tRNS)
nuclear@2 148 {
nuclear@2 149 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
nuclear@2 150 /* invert the alpha channel (in tRNS) */
nuclear@2 151 if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
nuclear@2 152 info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@2 153 {
nuclear@2 154 int j;
nuclear@2 155 for (j=0; j<(int)info_ptr->num_trans; j++)
nuclear@2 156 info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
nuclear@2 157 }
nuclear@2 158 #endif
nuclear@2 159 png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
nuclear@2 160 info_ptr->num_trans, info_ptr->color_type);
nuclear@2 161 }
nuclear@2 162 #endif
nuclear@2 163 #if defined(PNG_WRITE_bKGD_SUPPORTED)
nuclear@2 164 if (info_ptr->valid & PNG_INFO_bKGD)
nuclear@2 165 png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
nuclear@2 166 #endif
nuclear@2 167 #if defined(PNG_WRITE_hIST_SUPPORTED)
nuclear@2 168 if (info_ptr->valid & PNG_INFO_hIST)
nuclear@2 169 png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
nuclear@2 170 #endif
nuclear@2 171 #if defined(PNG_WRITE_oFFs_SUPPORTED)
nuclear@2 172 if (info_ptr->valid & PNG_INFO_oFFs)
nuclear@2 173 png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
nuclear@2 174 info_ptr->offset_unit_type);
nuclear@2 175 #endif
nuclear@2 176 #if defined(PNG_WRITE_pCAL_SUPPORTED)
nuclear@2 177 if (info_ptr->valid & PNG_INFO_pCAL)
nuclear@2 178 png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
nuclear@2 179 info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
nuclear@2 180 info_ptr->pcal_units, info_ptr->pcal_params);
nuclear@2 181 #endif
nuclear@2 182 #if defined(PNG_WRITE_sCAL_SUPPORTED)
nuclear@2 183 if (info_ptr->valid & PNG_INFO_sCAL)
nuclear@2 184 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
nuclear@2 185 png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
nuclear@2 186 info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
nuclear@2 187 #else
nuclear@2 188 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@2 189 png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
nuclear@2 190 info_ptr->scal_s_width, info_ptr->scal_s_height);
nuclear@2 191 #else
nuclear@2 192 png_warning(png_ptr,
nuclear@2 193 "png_write_sCAL not supported; sCAL chunk not written.");
nuclear@2 194 #endif
nuclear@2 195 #endif
nuclear@2 196 #endif
nuclear@2 197 #if defined(PNG_WRITE_pHYs_SUPPORTED)
nuclear@2 198 if (info_ptr->valid & PNG_INFO_pHYs)
nuclear@2 199 png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
nuclear@2 200 info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
nuclear@2 201 #endif
nuclear@2 202 #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@2 203 if (info_ptr->valid & PNG_INFO_tIME)
nuclear@2 204 {
nuclear@2 205 png_write_tIME(png_ptr, &(info_ptr->mod_time));
nuclear@2 206 png_ptr->mode |= PNG_WROTE_tIME;
nuclear@2 207 }
nuclear@2 208 #endif
nuclear@2 209 #if defined(PNG_WRITE_sPLT_SUPPORTED)
nuclear@2 210 if (info_ptr->valid & PNG_INFO_sPLT)
nuclear@2 211 for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
nuclear@2 212 png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
nuclear@2 213 #endif
nuclear@2 214 #if defined(PNG_WRITE_TEXT_SUPPORTED)
nuclear@2 215 /* Check to see if we need to write text chunks */
nuclear@2 216 for (i = 0; i < info_ptr->num_text; i++)
nuclear@2 217 {
nuclear@2 218 png_debug2(2, "Writing header text chunk %d, type %d\n", i,
nuclear@2 219 info_ptr->text[i].compression);
nuclear@2 220 /* an internationalized chunk? */
nuclear@2 221 if (info_ptr->text[i].compression > 0)
nuclear@2 222 {
nuclear@2 223 #if defined(PNG_WRITE_iTXt_SUPPORTED)
nuclear@2 224 /* write international chunk */
nuclear@2 225 png_write_iTXt(png_ptr,
nuclear@2 226 info_ptr->text[i].compression,
nuclear@2 227 info_ptr->text[i].key,
nuclear@2 228 info_ptr->text[i].lang,
nuclear@2 229 info_ptr->text[i].lang_key,
nuclear@2 230 info_ptr->text[i].text);
nuclear@2 231 #else
nuclear@2 232 png_warning(png_ptr, "Unable to write international text");
nuclear@2 233 #endif
nuclear@2 234 /* Mark this chunk as written */
nuclear@2 235 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@2 236 }
nuclear@2 237 /* If we want a compressed text chunk */
nuclear@2 238 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
nuclear@2 239 {
nuclear@2 240 #if defined(PNG_WRITE_zTXt_SUPPORTED)
nuclear@2 241 /* write compressed chunk */
nuclear@2 242 png_write_zTXt(png_ptr, info_ptr->text[i].key,
nuclear@2 243 info_ptr->text[i].text, 0,
nuclear@2 244 info_ptr->text[i].compression);
nuclear@2 245 #else
nuclear@2 246 png_warning(png_ptr, "Unable to write compressed text");
nuclear@2 247 #endif
nuclear@2 248 /* Mark this chunk as written */
nuclear@2 249 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
nuclear@2 250 }
nuclear@2 251 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
nuclear@2 252 {
nuclear@2 253 #if defined(PNG_WRITE_tEXt_SUPPORTED)
nuclear@2 254 /* write uncompressed chunk */
nuclear@2 255 png_write_tEXt(png_ptr, info_ptr->text[i].key,
nuclear@2 256 info_ptr->text[i].text,
nuclear@2 257 0);
nuclear@2 258 #else
nuclear@2 259 png_warning(png_ptr, "Unable to write uncompressed text");
nuclear@2 260 #endif
nuclear@2 261 /* Mark this chunk as written */
nuclear@2 262 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@2 263 }
nuclear@2 264 }
nuclear@2 265 #endif
nuclear@2 266 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@2 267 if (info_ptr->unknown_chunks_num)
nuclear@2 268 {
nuclear@2 269 png_unknown_chunk *up;
nuclear@2 270
nuclear@2 271 png_debug(5, "writing extra chunks\n");
nuclear@2 272
nuclear@2 273 for (up = info_ptr->unknown_chunks;
nuclear@2 274 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
nuclear@2 275 up++)
nuclear@2 276 {
nuclear@2 277 int keep=png_handle_as_unknown(png_ptr, up->name);
nuclear@2 278 if (keep != PNG_HANDLE_CHUNK_NEVER &&
nuclear@2 279 up->location && (up->location & PNG_HAVE_PLTE) &&
nuclear@2 280 !(up->location & PNG_HAVE_IDAT) &&
nuclear@2 281 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
nuclear@2 282 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
nuclear@2 283 {
nuclear@2 284 png_write_chunk(png_ptr, up->name, up->data, up->size);
nuclear@2 285 }
nuclear@2 286 }
nuclear@2 287 }
nuclear@2 288 #endif
nuclear@2 289 }
nuclear@2 290
nuclear@2 291 /* Writes the end of the PNG file. If you don't want to write comments or
nuclear@2 292 * time information, you can pass NULL for info. If you already wrote these
nuclear@2 293 * in png_write_info(), do not write them again here. If you have long
nuclear@2 294 * comments, I suggest writing them here, and compressing them.
nuclear@2 295 */
nuclear@2 296 void PNGAPI
nuclear@2 297 png_write_end(png_structp png_ptr, png_infop info_ptr)
nuclear@2 298 {
nuclear@2 299 png_debug(1, "in png_write_end\n");
nuclear@2 300 if (png_ptr == NULL)
nuclear@2 301 return;
nuclear@2 302 if (!(png_ptr->mode & PNG_HAVE_IDAT))
nuclear@2 303 png_error(png_ptr, "No IDATs written into file");
nuclear@2 304
nuclear@2 305 /* see if user wants us to write information chunks */
nuclear@2 306 if (info_ptr != NULL)
nuclear@2 307 {
nuclear@2 308 #if defined(PNG_WRITE_TEXT_SUPPORTED)
nuclear@2 309 int i; /* local index variable */
nuclear@2 310 #endif
nuclear@2 311 #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@2 312 /* check to see if user has supplied a time chunk */
nuclear@2 313 if ((info_ptr->valid & PNG_INFO_tIME) &&
nuclear@2 314 !(png_ptr->mode & PNG_WROTE_tIME))
nuclear@2 315 png_write_tIME(png_ptr, &(info_ptr->mod_time));
nuclear@2 316 #endif
nuclear@2 317 #if defined(PNG_WRITE_TEXT_SUPPORTED)
nuclear@2 318 /* loop through comment chunks */
nuclear@2 319 for (i = 0; i < info_ptr->num_text; i++)
nuclear@2 320 {
nuclear@2 321 png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,
nuclear@2 322 info_ptr->text[i].compression);
nuclear@2 323 /* an internationalized chunk? */
nuclear@2 324 if (info_ptr->text[i].compression > 0)
nuclear@2 325 {
nuclear@2 326 #if defined(PNG_WRITE_iTXt_SUPPORTED)
nuclear@2 327 /* write international chunk */
nuclear@2 328 png_write_iTXt(png_ptr,
nuclear@2 329 info_ptr->text[i].compression,
nuclear@2 330 info_ptr->text[i].key,
nuclear@2 331 info_ptr->text[i].lang,
nuclear@2 332 info_ptr->text[i].lang_key,
nuclear@2 333 info_ptr->text[i].text);
nuclear@2 334 #else
nuclear@2 335 png_warning(png_ptr, "Unable to write international text");
nuclear@2 336 #endif
nuclear@2 337 /* Mark this chunk as written */
nuclear@2 338 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@2 339 }
nuclear@2 340 else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
nuclear@2 341 {
nuclear@2 342 #if defined(PNG_WRITE_zTXt_SUPPORTED)
nuclear@2 343 /* write compressed chunk */
nuclear@2 344 png_write_zTXt(png_ptr, info_ptr->text[i].key,
nuclear@2 345 info_ptr->text[i].text, 0,
nuclear@2 346 info_ptr->text[i].compression);
nuclear@2 347 #else
nuclear@2 348 png_warning(png_ptr, "Unable to write compressed text");
nuclear@2 349 #endif
nuclear@2 350 /* Mark this chunk as written */
nuclear@2 351 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
nuclear@2 352 }
nuclear@2 353 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
nuclear@2 354 {
nuclear@2 355 #if defined(PNG_WRITE_tEXt_SUPPORTED)
nuclear@2 356 /* write uncompressed chunk */
nuclear@2 357 png_write_tEXt(png_ptr, info_ptr->text[i].key,
nuclear@2 358 info_ptr->text[i].text, 0);
nuclear@2 359 #else
nuclear@2 360 png_warning(png_ptr, "Unable to write uncompressed text");
nuclear@2 361 #endif
nuclear@2 362
nuclear@2 363 /* Mark this chunk as written */
nuclear@2 364 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@2 365 }
nuclear@2 366 }
nuclear@2 367 #endif
nuclear@2 368 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@2 369 if (info_ptr->unknown_chunks_num)
nuclear@2 370 {
nuclear@2 371 png_unknown_chunk *up;
nuclear@2 372
nuclear@2 373 png_debug(5, "writing extra chunks\n");
nuclear@2 374
nuclear@2 375 for (up = info_ptr->unknown_chunks;
nuclear@2 376 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
nuclear@2 377 up++)
nuclear@2 378 {
nuclear@2 379 int keep=png_handle_as_unknown(png_ptr, up->name);
nuclear@2 380 if (keep != PNG_HANDLE_CHUNK_NEVER &&
nuclear@2 381 up->location && (up->location & PNG_AFTER_IDAT) &&
nuclear@2 382 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
nuclear@2 383 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
nuclear@2 384 {
nuclear@2 385 png_write_chunk(png_ptr, up->name, up->data, up->size);
nuclear@2 386 }
nuclear@2 387 }
nuclear@2 388 }
nuclear@2 389 #endif
nuclear@2 390 }
nuclear@2 391
nuclear@2 392 png_ptr->mode |= PNG_AFTER_IDAT;
nuclear@2 393
nuclear@2 394 /* write end of PNG file */
nuclear@2 395 png_write_IEND(png_ptr);
nuclear@2 396 /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
nuclear@2 397 * and restored again in libpng-1.2.30, may cause some applications that
nuclear@2 398 * do not set png_ptr->output_flush_fn to crash. If your application
nuclear@2 399 * experiences a problem, please try building libpng with
nuclear@2 400 * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
nuclear@2 401 * png-mng-implement at lists.sf.net . This kludge will be removed
nuclear@2 402 * from libpng-1.4.0.
nuclear@2 403 */
nuclear@2 404 #if defined(PNG_WRITE_FLUSH_SUPPORTED) && \
nuclear@2 405 defined(PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED)
nuclear@2 406 png_flush(png_ptr);
nuclear@2 407 #endif
nuclear@2 408 }
nuclear@2 409
nuclear@2 410 #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@2 411 #if !defined(_WIN32_WCE)
nuclear@2 412 /* "time.h" functions are not supported on WindowsCE */
nuclear@2 413 void PNGAPI
nuclear@2 414 png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
nuclear@2 415 {
nuclear@2 416 png_debug(1, "in png_convert_from_struct_tm\n");
nuclear@2 417 ptime->year = (png_uint_16)(1900 + ttime->tm_year);
nuclear@2 418 ptime->month = (png_byte)(ttime->tm_mon + 1);
nuclear@2 419 ptime->day = (png_byte)ttime->tm_mday;
nuclear@2 420 ptime->hour = (png_byte)ttime->tm_hour;
nuclear@2 421 ptime->minute = (png_byte)ttime->tm_min;
nuclear@2 422 ptime->second = (png_byte)ttime->tm_sec;
nuclear@2 423 }
nuclear@2 424
nuclear@2 425 void PNGAPI
nuclear@2 426 png_convert_from_time_t(png_timep ptime, time_t ttime)
nuclear@2 427 {
nuclear@2 428 struct tm *tbuf;
nuclear@2 429
nuclear@2 430 png_debug(1, "in png_convert_from_time_t\n");
nuclear@2 431 tbuf = gmtime(&ttime);
nuclear@2 432 png_convert_from_struct_tm(ptime, tbuf);
nuclear@2 433 }
nuclear@2 434 #endif
nuclear@2 435 #endif
nuclear@2 436
nuclear@2 437 /* Initialize png_ptr structure, and allocate any memory needed */
nuclear@2 438 png_structp PNGAPI
nuclear@2 439 png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@2 440 png_error_ptr error_fn, png_error_ptr warn_fn)
nuclear@2 441 {
nuclear@2 442 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 443 return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
nuclear@2 444 warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
nuclear@2 445 }
nuclear@2 446
nuclear@2 447 /* Alternate initialize png_ptr structure, and allocate any memory needed */
nuclear@2 448 png_structp PNGAPI
nuclear@2 449 png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@2 450 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
nuclear@2 451 png_malloc_ptr malloc_fn, png_free_ptr free_fn)
nuclear@2 452 {
nuclear@2 453 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@2 454 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 455 volatile
nuclear@2 456 #endif
nuclear@2 457 png_structp png_ptr;
nuclear@2 458 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 459 #ifdef USE_FAR_KEYWORD
nuclear@2 460 jmp_buf jmpbuf;
nuclear@2 461 #endif
nuclear@2 462 #endif
nuclear@2 463 int i;
nuclear@2 464 png_debug(1, "in png_create_write_struct\n");
nuclear@2 465 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 466 png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
nuclear@2 467 (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
nuclear@2 468 #else
nuclear@2 469 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@2 470 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@2 471 if (png_ptr == NULL)
nuclear@2 472 return (NULL);
nuclear@2 473
nuclear@2 474 /* added at libpng-1.2.6 */
nuclear@2 475 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@2 476 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@2 477 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@2 478 #endif
nuclear@2 479
nuclear@2 480 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 481 #ifdef USE_FAR_KEYWORD
nuclear@2 482 if (setjmp(jmpbuf))
nuclear@2 483 #else
nuclear@2 484 if (setjmp(png_ptr->jmpbuf))
nuclear@2 485 #endif
nuclear@2 486 {
nuclear@2 487 png_free(png_ptr, png_ptr->zbuf);
nuclear@2 488 png_ptr->zbuf=NULL;
nuclear@2 489 png_destroy_struct(png_ptr);
nuclear@2 490 return (NULL);
nuclear@2 491 }
nuclear@2 492 #ifdef USE_FAR_KEYWORD
nuclear@2 493 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@2 494 #endif
nuclear@2 495 #endif
nuclear@2 496
nuclear@2 497 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 498 png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
nuclear@2 499 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@2 500 png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
nuclear@2 501
nuclear@2 502 if (user_png_ver)
nuclear@2 503 {
nuclear@2 504 i=0;
nuclear@2 505 do
nuclear@2 506 {
nuclear@2 507 if (user_png_ver[i] != png_libpng_ver[i])
nuclear@2 508 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@2 509 } while (png_libpng_ver[i++]);
nuclear@2 510 }
nuclear@2 511
nuclear@2 512 if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
nuclear@2 513 {
nuclear@2 514 /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
nuclear@2 515 * we must recompile any applications that use any older library version.
nuclear@2 516 * For versions after libpng 1.0, we will be compatible, so we need
nuclear@2 517 * only check the first digit.
nuclear@2 518 */
nuclear@2 519 if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
nuclear@2 520 (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
nuclear@2 521 (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
nuclear@2 522 {
nuclear@2 523 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@2 524 char msg[80];
nuclear@2 525 if (user_png_ver)
nuclear@2 526 {
nuclear@2 527 png_snprintf(msg, 80,
nuclear@2 528 "Application was compiled with png.h from libpng-%.20s",
nuclear@2 529 user_png_ver);
nuclear@2 530 png_warning(png_ptr, msg);
nuclear@2 531 }
nuclear@2 532 png_snprintf(msg, 80,
nuclear@2 533 "Application is running with png.c from libpng-%.20s",
nuclear@2 534 png_libpng_ver);
nuclear@2 535 png_warning(png_ptr, msg);
nuclear@2 536 #endif
nuclear@2 537 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@2 538 png_ptr->flags=0;
nuclear@2 539 #endif
nuclear@2 540 png_error(png_ptr,
nuclear@2 541 "Incompatible libpng version in application and library");
nuclear@2 542 }
nuclear@2 543 }
nuclear@2 544
nuclear@2 545 /* initialize zbuf - compression buffer */
nuclear@2 546 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@2 547 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@2 548 (png_uint_32)png_ptr->zbuf_size);
nuclear@2 549
nuclear@2 550 png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
nuclear@2 551 png_flush_ptr_NULL);
nuclear@2 552
nuclear@2 553 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@2 554 png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
nuclear@2 555 1, png_doublep_NULL, png_doublep_NULL);
nuclear@2 556 #endif
nuclear@2 557
nuclear@2 558 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 559 /* Applications that neglect to set up their own setjmp() and then encounter
nuclear@2 560 a png_error() will longjmp here. Since the jmpbuf is then meaningless we
nuclear@2 561 abort instead of returning. */
nuclear@2 562 #ifdef USE_FAR_KEYWORD
nuclear@2 563 if (setjmp(jmpbuf))
nuclear@2 564 PNG_ABORT();
nuclear@2 565 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@2 566 #else
nuclear@2 567 if (setjmp(png_ptr->jmpbuf))
nuclear@2 568 PNG_ABORT();
nuclear@2 569 #endif
nuclear@2 570 #endif
nuclear@2 571 return (png_ptr);
nuclear@2 572 }
nuclear@2 573
nuclear@2 574 /* Initialize png_ptr structure, and allocate any memory needed */
nuclear@2 575 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
nuclear@2 576 /* Deprecated. */
nuclear@2 577 #undef png_write_init
nuclear@2 578 void PNGAPI
nuclear@2 579 png_write_init(png_structp png_ptr)
nuclear@2 580 {
nuclear@2 581 /* We only come here via pre-1.0.7-compiled applications */
nuclear@2 582 png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
nuclear@2 583 }
nuclear@2 584
nuclear@2 585 void PNGAPI
nuclear@2 586 png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
nuclear@2 587 png_size_t png_struct_size, png_size_t png_info_size)
nuclear@2 588 {
nuclear@2 589 /* We only come here via pre-1.0.12-compiled applications */
nuclear@2 590 if (png_ptr == NULL) return;
nuclear@2 591 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@2 592 if (png_sizeof(png_struct) > png_struct_size ||
nuclear@2 593 png_sizeof(png_info) > png_info_size)
nuclear@2 594 {
nuclear@2 595 char msg[80];
nuclear@2 596 png_ptr->warning_fn=NULL;
nuclear@2 597 if (user_png_ver)
nuclear@2 598 {
nuclear@2 599 png_snprintf(msg, 80,
nuclear@2 600 "Application was compiled with png.h from libpng-%.20s",
nuclear@2 601 user_png_ver);
nuclear@2 602 png_warning(png_ptr, msg);
nuclear@2 603 }
nuclear@2 604 png_snprintf(msg, 80,
nuclear@2 605 "Application is running with png.c from libpng-%.20s",
nuclear@2 606 png_libpng_ver);
nuclear@2 607 png_warning(png_ptr, msg);
nuclear@2 608 }
nuclear@2 609 #endif
nuclear@2 610 if (png_sizeof(png_struct) > png_struct_size)
nuclear@2 611 {
nuclear@2 612 png_ptr->error_fn=NULL;
nuclear@2 613 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@2 614 png_ptr->flags=0;
nuclear@2 615 #endif
nuclear@2 616 png_error(png_ptr,
nuclear@2 617 "The png struct allocated by the application for writing is too small.");
nuclear@2 618 }
nuclear@2 619 if (png_sizeof(png_info) > png_info_size)
nuclear@2 620 {
nuclear@2 621 png_ptr->error_fn=NULL;
nuclear@2 622 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@2 623 png_ptr->flags=0;
nuclear@2 624 #endif
nuclear@2 625 png_error(png_ptr,
nuclear@2 626 "The info struct allocated by the application for writing is too small.");
nuclear@2 627 }
nuclear@2 628 png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
nuclear@2 629 }
nuclear@2 630 #endif /* PNG_1_0_X || PNG_1_2_X */
nuclear@2 631
nuclear@2 632
nuclear@2 633 void PNGAPI
nuclear@2 634 png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
nuclear@2 635 png_size_t png_struct_size)
nuclear@2 636 {
nuclear@2 637 png_structp png_ptr=*ptr_ptr;
nuclear@2 638 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 639 jmp_buf tmp_jmp; /* to save current jump buffer */
nuclear@2 640 #endif
nuclear@2 641
nuclear@2 642 int i = 0;
nuclear@2 643
nuclear@2 644 if (png_ptr == NULL)
nuclear@2 645 return;
nuclear@2 646
nuclear@2 647 do
nuclear@2 648 {
nuclear@2 649 if (user_png_ver[i] != png_libpng_ver[i])
nuclear@2 650 {
nuclear@2 651 #ifdef PNG_LEGACY_SUPPORTED
nuclear@2 652 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@2 653 #else
nuclear@2 654 png_ptr->warning_fn=NULL;
nuclear@2 655 png_warning(png_ptr,
nuclear@2 656 "Application uses deprecated png_write_init() and should be recompiled.");
nuclear@2 657 break;
nuclear@2 658 #endif
nuclear@2 659 }
nuclear@2 660 } while (png_libpng_ver[i++]);
nuclear@2 661
nuclear@2 662 png_debug(1, "in png_write_init_3\n");
nuclear@2 663
nuclear@2 664 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 665 /* save jump buffer and error functions */
nuclear@2 666 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@2 667 #endif
nuclear@2 668
nuclear@2 669 if (png_sizeof(png_struct) > png_struct_size)
nuclear@2 670 {
nuclear@2 671 png_destroy_struct(png_ptr);
nuclear@2 672 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@2 673 *ptr_ptr = png_ptr;
nuclear@2 674 }
nuclear@2 675
nuclear@2 676 /* reset all variables to 0 */
nuclear@2 677 png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@2 678
nuclear@2 679 /* added at libpng-1.2.6 */
nuclear@2 680 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@2 681 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@2 682 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@2 683 #endif
nuclear@2 684
nuclear@2 685 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 686 /* restore jump buffer */
nuclear@2 687 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@2 688 #endif
nuclear@2 689
nuclear@2 690 png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
nuclear@2 691 png_flush_ptr_NULL);
nuclear@2 692
nuclear@2 693 /* initialize zbuf - compression buffer */
nuclear@2 694 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@2 695 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@2 696 (png_uint_32)png_ptr->zbuf_size);
nuclear@2 697
nuclear@2 698 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@2 699 png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
nuclear@2 700 1, png_doublep_NULL, png_doublep_NULL);
nuclear@2 701 #endif
nuclear@2 702 }
nuclear@2 703
nuclear@2 704 /* Write a few rows of image data. If the image is interlaced,
nuclear@2 705 * either you will have to write the 7 sub images, or, if you
nuclear@2 706 * have called png_set_interlace_handling(), you will have to
nuclear@2 707 * "write" the image seven times.
nuclear@2 708 */
nuclear@2 709 void PNGAPI
nuclear@2 710 png_write_rows(png_structp png_ptr, png_bytepp row,
nuclear@2 711 png_uint_32 num_rows)
nuclear@2 712 {
nuclear@2 713 png_uint_32 i; /* row counter */
nuclear@2 714 png_bytepp rp; /* row pointer */
nuclear@2 715
nuclear@2 716 png_debug(1, "in png_write_rows\n");
nuclear@2 717
nuclear@2 718 if (png_ptr == NULL)
nuclear@2 719 return;
nuclear@2 720
nuclear@2 721 /* loop through the rows */
nuclear@2 722 for (i = 0, rp = row; i < num_rows; i++, rp++)
nuclear@2 723 {
nuclear@2 724 png_write_row(png_ptr, *rp);
nuclear@2 725 }
nuclear@2 726 }
nuclear@2 727
nuclear@2 728 /* Write the image. You only need to call this function once, even
nuclear@2 729 * if you are writing an interlaced image.
nuclear@2 730 */
nuclear@2 731 void PNGAPI
nuclear@2 732 png_write_image(png_structp png_ptr, png_bytepp image)
nuclear@2 733 {
nuclear@2 734 png_uint_32 i; /* row index */
nuclear@2 735 int pass, num_pass; /* pass variables */
nuclear@2 736 png_bytepp rp; /* points to current row */
nuclear@2 737
nuclear@2 738 if (png_ptr == NULL)
nuclear@2 739 return;
nuclear@2 740
nuclear@2 741 png_debug(1, "in png_write_image\n");
nuclear@2 742 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@2 743 /* intialize interlace handling. If image is not interlaced,
nuclear@2 744 this will set pass to 1 */
nuclear@2 745 num_pass = png_set_interlace_handling(png_ptr);
nuclear@2 746 #else
nuclear@2 747 num_pass = 1;
nuclear@2 748 #endif
nuclear@2 749 /* loop through passes */
nuclear@2 750 for (pass = 0; pass < num_pass; pass++)
nuclear@2 751 {
nuclear@2 752 /* loop through image */
nuclear@2 753 for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
nuclear@2 754 {
nuclear@2 755 png_write_row(png_ptr, *rp);
nuclear@2 756 }
nuclear@2 757 }
nuclear@2 758 }
nuclear@2 759
nuclear@2 760 /* called by user to write a row of image data */
nuclear@2 761 void PNGAPI
nuclear@2 762 png_write_row(png_structp png_ptr, png_bytep row)
nuclear@2 763 {
nuclear@2 764 if (png_ptr == NULL)
nuclear@2 765 return;
nuclear@2 766 png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
nuclear@2 767 png_ptr->row_number, png_ptr->pass);
nuclear@2 768
nuclear@2 769 /* initialize transformations and other stuff if first time */
nuclear@2 770 if (png_ptr->row_number == 0 && png_ptr->pass == 0)
nuclear@2 771 {
nuclear@2 772 /* make sure we wrote the header info */
nuclear@2 773 if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
nuclear@2 774 png_error(png_ptr,
nuclear@2 775 "png_write_info was never called before png_write_row.");
nuclear@2 776
nuclear@2 777 /* check for transforms that have been set but were defined out */
nuclear@2 778 #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
nuclear@2 779 if (png_ptr->transformations & PNG_INVERT_MONO)
nuclear@2 780 png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
nuclear@2 781 #endif
nuclear@2 782 #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
nuclear@2 783 if (png_ptr->transformations & PNG_FILLER)
nuclear@2 784 png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
nuclear@2 785 #endif
nuclear@2 786 #if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@2 787 if (png_ptr->transformations & PNG_PACKSWAP)
nuclear@2 788 png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
nuclear@2 789 #endif
nuclear@2 790 #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
nuclear@2 791 if (png_ptr->transformations & PNG_PACK)
nuclear@2 792 png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
nuclear@2 793 #endif
nuclear@2 794 #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@2 795 if (png_ptr->transformations & PNG_SHIFT)
nuclear@2 796 png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
nuclear@2 797 #endif
nuclear@2 798 #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
nuclear@2 799 if (png_ptr->transformations & PNG_BGR)
nuclear@2 800 png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
nuclear@2 801 #endif
nuclear@2 802 #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
nuclear@2 803 if (png_ptr->transformations & PNG_SWAP_BYTES)
nuclear@2 804 png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
nuclear@2 805 #endif
nuclear@2 806
nuclear@2 807 png_write_start_row(png_ptr);
nuclear@2 808 }
nuclear@2 809
nuclear@2 810 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@2 811 /* if interlaced and not interested in row, return */
nuclear@2 812 if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
nuclear@2 813 {
nuclear@2 814 switch (png_ptr->pass)
nuclear@2 815 {
nuclear@2 816 case 0:
nuclear@2 817 if (png_ptr->row_number & 0x07)
nuclear@2 818 {
nuclear@2 819 png_write_finish_row(png_ptr);
nuclear@2 820 return;
nuclear@2 821 }
nuclear@2 822 break;
nuclear@2 823 case 1:
nuclear@2 824 if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
nuclear@2 825 {
nuclear@2 826 png_write_finish_row(png_ptr);
nuclear@2 827 return;
nuclear@2 828 }
nuclear@2 829 break;
nuclear@2 830 case 2:
nuclear@2 831 if ((png_ptr->row_number & 0x07) != 4)
nuclear@2 832 {
nuclear@2 833 png_write_finish_row(png_ptr);
nuclear@2 834 return;
nuclear@2 835 }
nuclear@2 836 break;
nuclear@2 837 case 3:
nuclear@2 838 if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
nuclear@2 839 {
nuclear@2 840 png_write_finish_row(png_ptr);
nuclear@2 841 return;
nuclear@2 842 }
nuclear@2 843 break;
nuclear@2 844 case 4:
nuclear@2 845 if ((png_ptr->row_number & 0x03) != 2)
nuclear@2 846 {
nuclear@2 847 png_write_finish_row(png_ptr);
nuclear@2 848 return;
nuclear@2 849 }
nuclear@2 850 break;
nuclear@2 851 case 5:
nuclear@2 852 if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
nuclear@2 853 {
nuclear@2 854 png_write_finish_row(png_ptr);
nuclear@2 855 return;
nuclear@2 856 }
nuclear@2 857 break;
nuclear@2 858 case 6:
nuclear@2 859 if (!(png_ptr->row_number & 0x01))
nuclear@2 860 {
nuclear@2 861 png_write_finish_row(png_ptr);
nuclear@2 862 return;
nuclear@2 863 }
nuclear@2 864 break;
nuclear@2 865 }
nuclear@2 866 }
nuclear@2 867 #endif
nuclear@2 868
nuclear@2 869 /* set up row info for transformations */
nuclear@2 870 png_ptr->row_info.color_type = png_ptr->color_type;
nuclear@2 871 png_ptr->row_info.width = png_ptr->usr_width;
nuclear@2 872 png_ptr->row_info.channels = png_ptr->usr_channels;
nuclear@2 873 png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
nuclear@2 874 png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
nuclear@2 875 png_ptr->row_info.channels);
nuclear@2 876
nuclear@2 877 png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
nuclear@2 878 png_ptr->row_info.width);
nuclear@2 879
nuclear@2 880 png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
nuclear@2 881 png_debug1(3, "row_info->width = %lu\n", png_ptr->row_info.width);
nuclear@2 882 png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);
nuclear@2 883 png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
nuclear@2 884 png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
nuclear@2 885 png_debug1(3, "row_info->rowbytes = %lu\n", png_ptr->row_info.rowbytes);
nuclear@2 886
nuclear@2 887 /* Copy user's row into buffer, leaving room for filter byte. */
nuclear@2 888 png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
nuclear@2 889 png_ptr->row_info.rowbytes);
nuclear@2 890
nuclear@2 891 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@2 892 /* handle interlacing */
nuclear@2 893 if (png_ptr->interlaced && png_ptr->pass < 6 &&
nuclear@2 894 (png_ptr->transformations & PNG_INTERLACE))
nuclear@2 895 {
nuclear@2 896 png_do_write_interlace(&(png_ptr->row_info),
nuclear@2 897 png_ptr->row_buf + 1, png_ptr->pass);
nuclear@2 898 /* this should always get caught above, but still ... */
nuclear@2 899 if (!(png_ptr->row_info.width))
nuclear@2 900 {
nuclear@2 901 png_write_finish_row(png_ptr);
nuclear@2 902 return;
nuclear@2 903 }
nuclear@2 904 }
nuclear@2 905 #endif
nuclear@2 906
nuclear@2 907 /* handle other transformations */
nuclear@2 908 if (png_ptr->transformations)
nuclear@2 909 png_do_write_transformations(png_ptr);
nuclear@2 910
nuclear@2 911 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@2 912 /* Write filter_method 64 (intrapixel differencing) only if
nuclear@2 913 * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
nuclear@2 914 * 2. Libpng did not write a PNG signature (this filter_method is only
nuclear@2 915 * used in PNG datastreams that are embedded in MNG datastreams) and
nuclear@2 916 * 3. The application called png_permit_mng_features with a mask that
nuclear@2 917 * included PNG_FLAG_MNG_FILTER_64 and
nuclear@2 918 * 4. The filter_method is 64 and
nuclear@2 919 * 5. The color_type is RGB or RGBA
nuclear@2 920 */
nuclear@2 921 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
nuclear@2 922 (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
nuclear@2 923 {
nuclear@2 924 /* Intrapixel differencing */
nuclear@2 925 png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
nuclear@2 926 }
nuclear@2 927 #endif
nuclear@2 928
nuclear@2 929 /* Find a filter if necessary, filter the row and write it out. */
nuclear@2 930 png_write_find_filter(png_ptr, &(png_ptr->row_info));
nuclear@2 931
nuclear@2 932 if (png_ptr->write_row_fn != NULL)
nuclear@2 933 (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
nuclear@2 934 }
nuclear@2 935
nuclear@2 936 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@2 937 /* Set the automatic flush interval or 0 to turn flushing off */
nuclear@2 938 void PNGAPI
nuclear@2 939 png_set_flush(png_structp png_ptr, int nrows)
nuclear@2 940 {
nuclear@2 941 png_debug(1, "in png_set_flush\n");
nuclear@2 942 if (png_ptr == NULL)
nuclear@2 943 return;
nuclear@2 944 png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
nuclear@2 945 }
nuclear@2 946
nuclear@2 947 /* flush the current output buffers now */
nuclear@2 948 void PNGAPI
nuclear@2 949 png_write_flush(png_structp png_ptr)
nuclear@2 950 {
nuclear@2 951 int wrote_IDAT;
nuclear@2 952
nuclear@2 953 png_debug(1, "in png_write_flush\n");
nuclear@2 954 if (png_ptr == NULL)
nuclear@2 955 return;
nuclear@2 956 /* We have already written out all of the data */
nuclear@2 957 if (png_ptr->row_number >= png_ptr->num_rows)
nuclear@2 958 return;
nuclear@2 959
nuclear@2 960 do
nuclear@2 961 {
nuclear@2 962 int ret;
nuclear@2 963
nuclear@2 964 /* compress the data */
nuclear@2 965 ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
nuclear@2 966 wrote_IDAT = 0;
nuclear@2 967
nuclear@2 968 /* check for compression errors */
nuclear@2 969 if (ret != Z_OK)
nuclear@2 970 {
nuclear@2 971 if (png_ptr->zstream.msg != NULL)
nuclear@2 972 png_error(png_ptr, png_ptr->zstream.msg);
nuclear@2 973 else
nuclear@2 974 png_error(png_ptr, "zlib error");
nuclear@2 975 }
nuclear@2 976
nuclear@2 977 if (!(png_ptr->zstream.avail_out))
nuclear@2 978 {
nuclear@2 979 /* write the IDAT and reset the zlib output buffer */
nuclear@2 980 png_write_IDAT(png_ptr, png_ptr->zbuf,
nuclear@2 981 png_ptr->zbuf_size);
nuclear@2 982 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@2 983 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@2 984 wrote_IDAT = 1;
nuclear@2 985 }
nuclear@2 986 } while(wrote_IDAT == 1);
nuclear@2 987
nuclear@2 988 /* If there is any data left to be output, write it into a new IDAT */
nuclear@2 989 if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
nuclear@2 990 {
nuclear@2 991 /* write the IDAT and reset the zlib output buffer */
nuclear@2 992 png_write_IDAT(png_ptr, png_ptr->zbuf,
nuclear@2 993 png_ptr->zbuf_size - png_ptr->zstream.avail_out);
nuclear@2 994 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@2 995 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@2 996 }
nuclear@2 997 png_ptr->flush_rows = 0;
nuclear@2 998 png_flush(png_ptr);
nuclear@2 999 }
nuclear@2 1000 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
nuclear@2 1001
nuclear@2 1002 /* free all memory used by the write */
nuclear@2 1003 void PNGAPI
nuclear@2 1004 png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
nuclear@2 1005 {
nuclear@2 1006 png_structp png_ptr = NULL;
nuclear@2 1007 png_infop info_ptr = NULL;
nuclear@2 1008 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1009 png_free_ptr free_fn = NULL;
nuclear@2 1010 png_voidp mem_ptr = NULL;
nuclear@2 1011 #endif
nuclear@2 1012
nuclear@2 1013 png_debug(1, "in png_destroy_write_struct\n");
nuclear@2 1014 if (png_ptr_ptr != NULL)
nuclear@2 1015 {
nuclear@2 1016 png_ptr = *png_ptr_ptr;
nuclear@2 1017 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1018 free_fn = png_ptr->free_fn;
nuclear@2 1019 mem_ptr = png_ptr->mem_ptr;
nuclear@2 1020 #endif
nuclear@2 1021 }
nuclear@2 1022
nuclear@2 1023 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1024 if (png_ptr != NULL)
nuclear@2 1025 {
nuclear@2 1026 free_fn = png_ptr->free_fn;
nuclear@2 1027 mem_ptr = png_ptr->mem_ptr;
nuclear@2 1028 }
nuclear@2 1029 #endif
nuclear@2 1030
nuclear@2 1031 if (info_ptr_ptr != NULL)
nuclear@2 1032 info_ptr = *info_ptr_ptr;
nuclear@2 1033
nuclear@2 1034 if (info_ptr != NULL)
nuclear@2 1035 {
nuclear@2 1036 if (png_ptr != NULL)
nuclear@2 1037 {
nuclear@2 1038 png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
nuclear@2 1039
nuclear@2 1040 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@2 1041 if (png_ptr->num_chunk_list)
nuclear@2 1042 {
nuclear@2 1043 png_free(png_ptr, png_ptr->chunk_list);
nuclear@2 1044 png_ptr->chunk_list=NULL;
nuclear@2 1045 png_ptr->num_chunk_list = 0;
nuclear@2 1046 }
nuclear@2 1047 #endif
nuclear@2 1048 }
nuclear@2 1049
nuclear@2 1050 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1051 png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
nuclear@2 1052 (png_voidp)mem_ptr);
nuclear@2 1053 #else
nuclear@2 1054 png_destroy_struct((png_voidp)info_ptr);
nuclear@2 1055 #endif
nuclear@2 1056 *info_ptr_ptr = NULL;
nuclear@2 1057 }
nuclear@2 1058
nuclear@2 1059 if (png_ptr != NULL)
nuclear@2 1060 {
nuclear@2 1061 png_write_destroy(png_ptr);
nuclear@2 1062 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1063 png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
nuclear@2 1064 (png_voidp)mem_ptr);
nuclear@2 1065 #else
nuclear@2 1066 png_destroy_struct((png_voidp)png_ptr);
nuclear@2 1067 #endif
nuclear@2 1068 *png_ptr_ptr = NULL;
nuclear@2 1069 }
nuclear@2 1070 }
nuclear@2 1071
nuclear@2 1072
nuclear@2 1073 /* Free any memory used in png_ptr struct (old method) */
nuclear@2 1074 void /* PRIVATE */
nuclear@2 1075 png_write_destroy(png_structp png_ptr)
nuclear@2 1076 {
nuclear@2 1077 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 1078 jmp_buf tmp_jmp; /* save jump buffer */
nuclear@2 1079 #endif
nuclear@2 1080 png_error_ptr error_fn;
nuclear@2 1081 png_error_ptr warning_fn;
nuclear@2 1082 png_voidp error_ptr;
nuclear@2 1083 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1084 png_free_ptr free_fn;
nuclear@2 1085 #endif
nuclear@2 1086
nuclear@2 1087 png_debug(1, "in png_write_destroy\n");
nuclear@2 1088 /* free any memory zlib uses */
nuclear@2 1089 deflateEnd(&png_ptr->zstream);
nuclear@2 1090
nuclear@2 1091 /* free our memory. png_free checks NULL for us. */
nuclear@2 1092 png_free(png_ptr, png_ptr->zbuf);
nuclear@2 1093 png_free(png_ptr, png_ptr->row_buf);
nuclear@2 1094 #ifndef PNG_NO_WRITE_FILTER
nuclear@2 1095 png_free(png_ptr, png_ptr->prev_row);
nuclear@2 1096 png_free(png_ptr, png_ptr->sub_row);
nuclear@2 1097 png_free(png_ptr, png_ptr->up_row);
nuclear@2 1098 png_free(png_ptr, png_ptr->avg_row);
nuclear@2 1099 png_free(png_ptr, png_ptr->paeth_row);
nuclear@2 1100 #endif
nuclear@2 1101
nuclear@2 1102 #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@2 1103 png_free(png_ptr, png_ptr->time_buffer);
nuclear@2 1104 #endif
nuclear@2 1105
nuclear@2 1106 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@2 1107 png_free(png_ptr, png_ptr->prev_filters);
nuclear@2 1108 png_free(png_ptr, png_ptr->filter_weights);
nuclear@2 1109 png_free(png_ptr, png_ptr->inv_filter_weights);
nuclear@2 1110 png_free(png_ptr, png_ptr->filter_costs);
nuclear@2 1111 png_free(png_ptr, png_ptr->inv_filter_costs);
nuclear@2 1112 #endif
nuclear@2 1113
nuclear@2 1114 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 1115 /* reset structure */
nuclear@2 1116 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@2 1117 #endif
nuclear@2 1118
nuclear@2 1119 error_fn = png_ptr->error_fn;
nuclear@2 1120 warning_fn = png_ptr->warning_fn;
nuclear@2 1121 error_ptr = png_ptr->error_ptr;
nuclear@2 1122 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1123 free_fn = png_ptr->free_fn;
nuclear@2 1124 #endif
nuclear@2 1125
nuclear@2 1126 png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@2 1127
nuclear@2 1128 png_ptr->error_fn = error_fn;
nuclear@2 1129 png_ptr->warning_fn = warning_fn;
nuclear@2 1130 png_ptr->error_ptr = error_ptr;
nuclear@2 1131 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1132 png_ptr->free_fn = free_fn;
nuclear@2 1133 #endif
nuclear@2 1134
nuclear@2 1135 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 1136 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@2 1137 #endif
nuclear@2 1138 }
nuclear@2 1139
nuclear@2 1140 /* Allow the application to select one or more row filters to use. */
nuclear@2 1141 void PNGAPI
nuclear@2 1142 png_set_filter(png_structp png_ptr, int method, int filters)
nuclear@2 1143 {
nuclear@2 1144 png_debug(1, "in png_set_filter\n");
nuclear@2 1145 if (png_ptr == NULL)
nuclear@2 1146 return;
nuclear@2 1147 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@2 1148 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
nuclear@2 1149 (method == PNG_INTRAPIXEL_DIFFERENCING))
nuclear@2 1150 method = PNG_FILTER_TYPE_BASE;
nuclear@2 1151 #endif
nuclear@2 1152 if (method == PNG_FILTER_TYPE_BASE)
nuclear@2 1153 {
nuclear@2 1154 switch (filters & (PNG_ALL_FILTERS | 0x07))
nuclear@2 1155 {
nuclear@2 1156 #ifndef PNG_NO_WRITE_FILTER
nuclear@2 1157 case 5:
nuclear@2 1158 case 6:
nuclear@2 1159 case 7: png_warning(png_ptr, "Unknown row filter for method 0");
nuclear@2 1160 #endif /* PNG_NO_WRITE_FILTER */
nuclear@2 1161 case PNG_FILTER_VALUE_NONE:
nuclear@2 1162 png_ptr->do_filter=PNG_FILTER_NONE; break;
nuclear@2 1163 #ifndef PNG_NO_WRITE_FILTER
nuclear@2 1164 case PNG_FILTER_VALUE_SUB:
nuclear@2 1165 png_ptr->do_filter=PNG_FILTER_SUB; break;
nuclear@2 1166 case PNG_FILTER_VALUE_UP:
nuclear@2 1167 png_ptr->do_filter=PNG_FILTER_UP; break;
nuclear@2 1168 case PNG_FILTER_VALUE_AVG:
nuclear@2 1169 png_ptr->do_filter=PNG_FILTER_AVG; break;
nuclear@2 1170 case PNG_FILTER_VALUE_PAETH:
nuclear@2 1171 png_ptr->do_filter=PNG_FILTER_PAETH; break;
nuclear@2 1172 default: png_ptr->do_filter = (png_byte)filters; break;
nuclear@2 1173 #else
nuclear@2 1174 default: png_warning(png_ptr, "Unknown row filter for method 0");
nuclear@2 1175 #endif /* PNG_NO_WRITE_FILTER */
nuclear@2 1176 }
nuclear@2 1177
nuclear@2 1178 /* If we have allocated the row_buf, this means we have already started
nuclear@2 1179 * with the image and we should have allocated all of the filter buffers
nuclear@2 1180 * that have been selected. If prev_row isn't already allocated, then
nuclear@2 1181 * it is too late to start using the filters that need it, since we
nuclear@2 1182 * will be missing the data in the previous row. If an application
nuclear@2 1183 * wants to start and stop using particular filters during compression,
nuclear@2 1184 * it should start out with all of the filters, and then add and
nuclear@2 1185 * remove them after the start of compression.
nuclear@2 1186 */
nuclear@2 1187 if (png_ptr->row_buf != NULL)
nuclear@2 1188 {
nuclear@2 1189 #ifndef PNG_NO_WRITE_FILTER
nuclear@2 1190 if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
nuclear@2 1191 {
nuclear@2 1192 png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
nuclear@2 1193 (png_ptr->rowbytes + 1));
nuclear@2 1194 png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
nuclear@2 1195 }
nuclear@2 1196
nuclear@2 1197 if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
nuclear@2 1198 {
nuclear@2 1199 if (png_ptr->prev_row == NULL)
nuclear@2 1200 {
nuclear@2 1201 png_warning(png_ptr, "Can't add Up filter after starting");
nuclear@2 1202 png_ptr->do_filter &= ~PNG_FILTER_UP;
nuclear@2 1203 }
nuclear@2 1204 else
nuclear@2 1205 {
nuclear@2 1206 png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
nuclear@2 1207 (png_ptr->rowbytes + 1));
nuclear@2 1208 png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
nuclear@2 1209 }
nuclear@2 1210 }
nuclear@2 1211
nuclear@2 1212 if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
nuclear@2 1213 {
nuclear@2 1214 if (png_ptr->prev_row == NULL)
nuclear@2 1215 {
nuclear@2 1216 png_warning(png_ptr, "Can't add Average filter after starting");
nuclear@2 1217 png_ptr->do_filter &= ~PNG_FILTER_AVG;
nuclear@2 1218 }
nuclear@2 1219 else
nuclear@2 1220 {
nuclear@2 1221 png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
nuclear@2 1222 (png_ptr->rowbytes + 1));
nuclear@2 1223 png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
nuclear@2 1224 }
nuclear@2 1225 }
nuclear@2 1226
nuclear@2 1227 if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
nuclear@2 1228 png_ptr->paeth_row == NULL)
nuclear@2 1229 {
nuclear@2 1230 if (png_ptr->prev_row == NULL)
nuclear@2 1231 {
nuclear@2 1232 png_warning(png_ptr, "Can't add Paeth filter after starting");
nuclear@2 1233 png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
nuclear@2 1234 }
nuclear@2 1235 else
nuclear@2 1236 {
nuclear@2 1237 png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
nuclear@2 1238 (png_ptr->rowbytes + 1));
nuclear@2 1239 png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
nuclear@2 1240 }
nuclear@2 1241 }
nuclear@2 1242
nuclear@2 1243 if (png_ptr->do_filter == PNG_NO_FILTERS)
nuclear@2 1244 #endif /* PNG_NO_WRITE_FILTER */
nuclear@2 1245 png_ptr->do_filter = PNG_FILTER_NONE;
nuclear@2 1246 }
nuclear@2 1247 }
nuclear@2 1248 else
nuclear@2 1249 png_error(png_ptr, "Unknown custom filter method");
nuclear@2 1250 }
nuclear@2 1251
nuclear@2 1252 /* This allows us to influence the way in which libpng chooses the "best"
nuclear@2 1253 * filter for the current scanline. While the "minimum-sum-of-absolute-
nuclear@2 1254 * differences metric is relatively fast and effective, there is some
nuclear@2 1255 * question as to whether it can be improved upon by trying to keep the
nuclear@2 1256 * filtered data going to zlib more consistent, hopefully resulting in
nuclear@2 1257 * better compression.
nuclear@2 1258 */
nuclear@2 1259 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */
nuclear@2 1260 void PNGAPI
nuclear@2 1261 png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
nuclear@2 1262 int num_weights, png_doublep filter_weights,
nuclear@2 1263 png_doublep filter_costs)
nuclear@2 1264 {
nuclear@2 1265 int i;
nuclear@2 1266
nuclear@2 1267 png_debug(1, "in png_set_filter_heuristics\n");
nuclear@2 1268 if (png_ptr == NULL)
nuclear@2 1269 return;
nuclear@2 1270 if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
nuclear@2 1271 {
nuclear@2 1272 png_warning(png_ptr, "Unknown filter heuristic method");
nuclear@2 1273 return;
nuclear@2 1274 }
nuclear@2 1275
nuclear@2 1276 if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
nuclear@2 1277 {
nuclear@2 1278 heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
nuclear@2 1279 }
nuclear@2 1280
nuclear@2 1281 if (num_weights < 0 || filter_weights == NULL ||
nuclear@2 1282 heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
nuclear@2 1283 {
nuclear@2 1284 num_weights = 0;
nuclear@2 1285 }
nuclear@2 1286
nuclear@2 1287 png_ptr->num_prev_filters = (png_byte)num_weights;
nuclear@2 1288 png_ptr->heuristic_method = (png_byte)heuristic_method;
nuclear@2 1289
nuclear@2 1290 if (num_weights > 0)
nuclear@2 1291 {
nuclear@2 1292 if (png_ptr->prev_filters == NULL)
nuclear@2 1293 {
nuclear@2 1294 png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
nuclear@2 1295 (png_uint_32)(png_sizeof(png_byte) * num_weights));
nuclear@2 1296
nuclear@2 1297 /* To make sure that the weighting starts out fairly */
nuclear@2 1298 for (i = 0; i < num_weights; i++)
nuclear@2 1299 {
nuclear@2 1300 png_ptr->prev_filters[i] = 255;
nuclear@2 1301 }
nuclear@2 1302 }
nuclear@2 1303
nuclear@2 1304 if (png_ptr->filter_weights == NULL)
nuclear@2 1305 {
nuclear@2 1306 png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
nuclear@2 1307 (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
nuclear@2 1308
nuclear@2 1309 png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
nuclear@2 1310 (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
nuclear@2 1311 for (i = 0; i < num_weights; i++)
nuclear@2 1312 {
nuclear@2 1313 png_ptr->inv_filter_weights[i] =
nuclear@2 1314 png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
nuclear@2 1315 }
nuclear@2 1316 }
nuclear@2 1317
nuclear@2 1318 for (i = 0; i < num_weights; i++)
nuclear@2 1319 {
nuclear@2 1320 if (filter_weights[i] < 0.0)
nuclear@2 1321 {
nuclear@2 1322 png_ptr->inv_filter_weights[i] =
nuclear@2 1323 png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
nuclear@2 1324 }
nuclear@2 1325 else
nuclear@2 1326 {
nuclear@2 1327 png_ptr->inv_filter_weights[i] =
nuclear@2 1328 (png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);
nuclear@2 1329 png_ptr->filter_weights[i] =
nuclear@2 1330 (png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
nuclear@2 1331 }
nuclear@2 1332 }
nuclear@2 1333 }
nuclear@2 1334
nuclear@2 1335 /* If, in the future, there are other filter methods, this would
nuclear@2 1336 * need to be based on png_ptr->filter.
nuclear@2 1337 */
nuclear@2 1338 if (png_ptr->filter_costs == NULL)
nuclear@2 1339 {
nuclear@2 1340 png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
nuclear@2 1341 (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
nuclear@2 1342
nuclear@2 1343 png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
nuclear@2 1344 (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
nuclear@2 1345
nuclear@2 1346 for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
nuclear@2 1347 {
nuclear@2 1348 png_ptr->inv_filter_costs[i] =
nuclear@2 1349 png_ptr->filter_costs[i] = PNG_COST_FACTOR;
nuclear@2 1350 }
nuclear@2 1351 }
nuclear@2 1352
nuclear@2 1353 /* Here is where we set the relative costs of the different filters. We
nuclear@2 1354 * should take the desired compression level into account when setting
nuclear@2 1355 * the costs, so that Paeth, for instance, has a high relative cost at low
nuclear@2 1356 * compression levels, while it has a lower relative cost at higher
nuclear@2 1357 * compression settings. The filter types are in order of increasing
nuclear@2 1358 * relative cost, so it would be possible to do this with an algorithm.
nuclear@2 1359 */
nuclear@2 1360 for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
nuclear@2 1361 {
nuclear@2 1362 if (filter_costs == NULL || filter_costs[i] < 0.0)
nuclear@2 1363 {
nuclear@2 1364 png_ptr->inv_filter_costs[i] =
nuclear@2 1365 png_ptr->filter_costs[i] = PNG_COST_FACTOR;
nuclear@2 1366 }
nuclear@2 1367 else if (filter_costs[i] >= 1.0)
nuclear@2 1368 {
nuclear@2 1369 png_ptr->inv_filter_costs[i] =
nuclear@2 1370 (png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);
nuclear@2 1371 png_ptr->filter_costs[i] =
nuclear@2 1372 (png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);
nuclear@2 1373 }
nuclear@2 1374 }
nuclear@2 1375 }
nuclear@2 1376 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
nuclear@2 1377
nuclear@2 1378 void PNGAPI
nuclear@2 1379 png_set_compression_level(png_structp png_ptr, int level)
nuclear@2 1380 {
nuclear@2 1381 png_debug(1, "in png_set_compression_level\n");
nuclear@2 1382 if (png_ptr == NULL)
nuclear@2 1383 return;
nuclear@2 1384 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
nuclear@2 1385 png_ptr->zlib_level = level;
nuclear@2 1386 }
nuclear@2 1387
nuclear@2 1388 void PNGAPI
nuclear@2 1389 png_set_compression_mem_level(png_structp png_ptr, int mem_level)
nuclear@2 1390 {
nuclear@2 1391 png_debug(1, "in png_set_compression_mem_level\n");
nuclear@2 1392 if (png_ptr == NULL)
nuclear@2 1393 return;
nuclear@2 1394 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
nuclear@2 1395 png_ptr->zlib_mem_level = mem_level;
nuclear@2 1396 }
nuclear@2 1397
nuclear@2 1398 void PNGAPI
nuclear@2 1399 png_set_compression_strategy(png_structp png_ptr, int strategy)
nuclear@2 1400 {
nuclear@2 1401 png_debug(1, "in png_set_compression_strategy\n");
nuclear@2 1402 if (png_ptr == NULL)
nuclear@2 1403 return;
nuclear@2 1404 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
nuclear@2 1405 png_ptr->zlib_strategy = strategy;
nuclear@2 1406 }
nuclear@2 1407
nuclear@2 1408 void PNGAPI
nuclear@2 1409 png_set_compression_window_bits(png_structp png_ptr, int window_bits)
nuclear@2 1410 {
nuclear@2 1411 if (png_ptr == NULL)
nuclear@2 1412 return;
nuclear@2 1413 if (window_bits > 15)
nuclear@2 1414 png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
nuclear@2 1415 else if (window_bits < 8)
nuclear@2 1416 png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
nuclear@2 1417 #ifndef WBITS_8_OK
nuclear@2 1418 /* avoid libpng bug with 256-byte windows */
nuclear@2 1419 if (window_bits == 8)
nuclear@2 1420 {
nuclear@2 1421 png_warning(png_ptr, "Compression window is being reset to 512");
nuclear@2 1422 window_bits=9;
nuclear@2 1423 }
nuclear@2 1424 #endif
nuclear@2 1425 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
nuclear@2 1426 png_ptr->zlib_window_bits = window_bits;
nuclear@2 1427 }
nuclear@2 1428
nuclear@2 1429 void PNGAPI
nuclear@2 1430 png_set_compression_method(png_structp png_ptr, int method)
nuclear@2 1431 {
nuclear@2 1432 png_debug(1, "in png_set_compression_method\n");
nuclear@2 1433 if (png_ptr == NULL)
nuclear@2 1434 return;
nuclear@2 1435 if (method != 8)
nuclear@2 1436 png_warning(png_ptr, "Only compression method 8 is supported by PNG");
nuclear@2 1437 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
nuclear@2 1438 png_ptr->zlib_method = method;
nuclear@2 1439 }
nuclear@2 1440
nuclear@2 1441 void PNGAPI
nuclear@2 1442 png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
nuclear@2 1443 {
nuclear@2 1444 if (png_ptr == NULL)
nuclear@2 1445 return;
nuclear@2 1446 png_ptr->write_row_fn = write_row_fn;
nuclear@2 1447 }
nuclear@2 1448
nuclear@2 1449 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
nuclear@2 1450 void PNGAPI
nuclear@2 1451 png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
nuclear@2 1452 write_user_transform_fn)
nuclear@2 1453 {
nuclear@2 1454 png_debug(1, "in png_set_write_user_transform_fn\n");
nuclear@2 1455 if (png_ptr == NULL)
nuclear@2 1456 return;
nuclear@2 1457 png_ptr->transformations |= PNG_USER_TRANSFORM;
nuclear@2 1458 png_ptr->write_user_transform_fn = write_user_transform_fn;
nuclear@2 1459 }
nuclear@2 1460 #endif
nuclear@2 1461
nuclear@2 1462
nuclear@2 1463 #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@2 1464 void PNGAPI
nuclear@2 1465 png_write_png(png_structp png_ptr, png_infop info_ptr,
nuclear@2 1466 int transforms, voidp params)
nuclear@2 1467 {
nuclear@2 1468 if (png_ptr == NULL || info_ptr == NULL)
nuclear@2 1469 return;
nuclear@2 1470 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
nuclear@2 1471 /* invert the alpha channel from opacity to transparency */
nuclear@2 1472 if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
nuclear@2 1473 png_set_invert_alpha(png_ptr);
nuclear@2 1474 #endif
nuclear@2 1475
nuclear@2 1476 /* Write the file header information. */
nuclear@2 1477 png_write_info(png_ptr, info_ptr);
nuclear@2 1478
nuclear@2 1479 /* ------ these transformations don't touch the info structure ------- */
nuclear@2 1480
nuclear@2 1481 #if defined(PNG_WRITE_INVERT_SUPPORTED)
nuclear@2 1482 /* invert monochrome pixels */
nuclear@2 1483 if (transforms & PNG_TRANSFORM_INVERT_MONO)
nuclear@2 1484 png_set_invert_mono(png_ptr);
nuclear@2 1485 #endif
nuclear@2 1486
nuclear@2 1487 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
nuclear@2 1488 /* Shift the pixels up to a legal bit depth and fill in
nuclear@2 1489 * as appropriate to correctly scale the image.
nuclear@2 1490 */
nuclear@2 1491 if ((transforms & PNG_TRANSFORM_SHIFT)
nuclear@2 1492 && (info_ptr->valid & PNG_INFO_sBIT))
nuclear@2 1493 png_set_shift(png_ptr, &info_ptr->sig_bit);
nuclear@2 1494 #endif
nuclear@2 1495
nuclear@2 1496 #if defined(PNG_WRITE_PACK_SUPPORTED)
nuclear@2 1497 /* pack pixels into bytes */
nuclear@2 1498 if (transforms & PNG_TRANSFORM_PACKING)
nuclear@2 1499 png_set_packing(png_ptr);
nuclear@2 1500 #endif
nuclear@2 1501
nuclear@2 1502 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
nuclear@2 1503 /* swap location of alpha bytes from ARGB to RGBA */
nuclear@2 1504 if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
nuclear@2 1505 png_set_swap_alpha(png_ptr);
nuclear@2 1506 #endif
nuclear@2 1507
nuclear@2 1508 #if defined(PNG_WRITE_FILLER_SUPPORTED)
nuclear@2 1509 /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
nuclear@2 1510 * RGB (4 channels -> 3 channels). The second parameter is not used.
nuclear@2 1511 */
nuclear@2 1512 if (transforms & PNG_TRANSFORM_STRIP_FILLER)
nuclear@2 1513 png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
nuclear@2 1514 #endif
nuclear@2 1515
nuclear@2 1516 #if defined(PNG_WRITE_BGR_SUPPORTED)
nuclear@2 1517 /* flip BGR pixels to RGB */
nuclear@2 1518 if (transforms & PNG_TRANSFORM_BGR)
nuclear@2 1519 png_set_bgr(png_ptr);
nuclear@2 1520 #endif
nuclear@2 1521
nuclear@2 1522 #if defined(PNG_WRITE_SWAP_SUPPORTED)
nuclear@2 1523 /* swap bytes of 16-bit files to most significant byte first */
nuclear@2 1524 if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
nuclear@2 1525 png_set_swap(png_ptr);
nuclear@2 1526 #endif
nuclear@2 1527
nuclear@2 1528 #if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
nuclear@2 1529 /* swap bits of 1, 2, 4 bit packed pixel formats */
nuclear@2 1530 if (transforms & PNG_TRANSFORM_PACKSWAP)
nuclear@2 1531 png_set_packswap(png_ptr);
nuclear@2 1532 #endif
nuclear@2 1533
nuclear@2 1534 /* ----------------------- end of transformations ------------------- */
nuclear@2 1535
nuclear@2 1536 /* write the bits */
nuclear@2 1537 if (info_ptr->valid & PNG_INFO_IDAT)
nuclear@2 1538 png_write_image(png_ptr, info_ptr->row_pointers);
nuclear@2 1539
nuclear@2 1540 /* It is REQUIRED to call this to finish writing the rest of the file */
nuclear@2 1541 png_write_end(png_ptr, info_ptr);
nuclear@2 1542
nuclear@2 1543 transforms = transforms; /* quiet compiler warnings */
nuclear@2 1544 params = params;
nuclear@2 1545 }
nuclear@2 1546 #endif
nuclear@2 1547 #endif /* PNG_WRITE_SUPPORTED */