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annotate libs/libpng/pngwrite.c @ 30:8dd271942543

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fixed everything
author John Tsiombikas <nuclear@mutantstargoat.com>
date Thu, 08 Sep 2011 14:52:13 +0300
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children
rev   line source
nuclear@26 1
nuclear@26 2 /* pngwrite.c - general routines to write a PNG file
nuclear@26 3 *
nuclear@26 4 * Last changed in libpng 1.2.31 [August 19, 2008]
nuclear@26 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@26 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@26 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@26 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@26 9 */
nuclear@26 10
nuclear@26 11 /* get internal access to png.h */
nuclear@26 12 #define PNG_INTERNAL
nuclear@26 13 #include "png.h"
nuclear@26 14 #ifdef PNG_WRITE_SUPPORTED
nuclear@26 15
nuclear@26 16 /* Writes all the PNG information. This is the suggested way to use the
nuclear@26 17 * library. If you have a new chunk to add, make a function to write it,
nuclear@26 18 * and put it in the correct location here. If you want the chunk written
nuclear@26 19 * after the image data, put it in png_write_end(). I strongly encourage
nuclear@26 20 * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
nuclear@26 21 * the chunk, as that will keep the code from breaking if you want to just
nuclear@26 22 * write a plain PNG file. If you have long comments, I suggest writing
nuclear@26 23 * them in png_write_end(), and compressing them.
nuclear@26 24 */
nuclear@26 25 void PNGAPI
nuclear@26 26 png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
nuclear@26 27 {
nuclear@26 28 png_debug(1, "in png_write_info_before_PLTE\n");
nuclear@26 29 if (png_ptr == NULL || info_ptr == NULL)
nuclear@26 30 return;
nuclear@26 31 if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
nuclear@26 32 {
nuclear@26 33 png_write_sig(png_ptr); /* write PNG signature */
nuclear@26 34 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@26 35 if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
nuclear@26 36 {
nuclear@26 37 png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
nuclear@26 38 png_ptr->mng_features_permitted=0;
nuclear@26 39 }
nuclear@26 40 #endif
nuclear@26 41 /* write IHDR information. */
nuclear@26 42 png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
nuclear@26 43 info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
nuclear@26 44 info_ptr->filter_type,
nuclear@26 45 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@26 46 info_ptr->interlace_type);
nuclear@26 47 #else
nuclear@26 48 0);
nuclear@26 49 #endif
nuclear@26 50 /* the rest of these check to see if the valid field has the appropriate
nuclear@26 51 flag set, and if it does, writes the chunk. */
nuclear@26 52 #if defined(PNG_WRITE_gAMA_SUPPORTED)
nuclear@26 53 if (info_ptr->valid & PNG_INFO_gAMA)
nuclear@26 54 {
nuclear@26 55 # ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 56 png_write_gAMA(png_ptr, info_ptr->gamma);
nuclear@26 57 #else
nuclear@26 58 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26 59 png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
nuclear@26 60 # endif
nuclear@26 61 #endif
nuclear@26 62 }
nuclear@26 63 #endif
nuclear@26 64 #if defined(PNG_WRITE_sRGB_SUPPORTED)
nuclear@26 65 if (info_ptr->valid & PNG_INFO_sRGB)
nuclear@26 66 png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
nuclear@26 67 #endif
nuclear@26 68 #if defined(PNG_WRITE_iCCP_SUPPORTED)
nuclear@26 69 if (info_ptr->valid & PNG_INFO_iCCP)
nuclear@26 70 png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
nuclear@26 71 info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
nuclear@26 72 #endif
nuclear@26 73 #if defined(PNG_WRITE_sBIT_SUPPORTED)
nuclear@26 74 if (info_ptr->valid & PNG_INFO_sBIT)
nuclear@26 75 png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
nuclear@26 76 #endif
nuclear@26 77 #if defined(PNG_WRITE_cHRM_SUPPORTED)
nuclear@26 78 if (info_ptr->valid & PNG_INFO_cHRM)
nuclear@26 79 {
nuclear@26 80 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 81 png_write_cHRM(png_ptr,
nuclear@26 82 info_ptr->x_white, info_ptr->y_white,
nuclear@26 83 info_ptr->x_red, info_ptr->y_red,
nuclear@26 84 info_ptr->x_green, info_ptr->y_green,
nuclear@26 85 info_ptr->x_blue, info_ptr->y_blue);
nuclear@26 86 #else
nuclear@26 87 # ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26 88 png_write_cHRM_fixed(png_ptr,
nuclear@26 89 info_ptr->int_x_white, info_ptr->int_y_white,
nuclear@26 90 info_ptr->int_x_red, info_ptr->int_y_red,
nuclear@26 91 info_ptr->int_x_green, info_ptr->int_y_green,
nuclear@26 92 info_ptr->int_x_blue, info_ptr->int_y_blue);
nuclear@26 93 # endif
nuclear@26 94 #endif
nuclear@26 95 }
nuclear@26 96 #endif
nuclear@26 97 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26 98 if (info_ptr->unknown_chunks_num)
nuclear@26 99 {
nuclear@26 100 png_unknown_chunk *up;
nuclear@26 101
nuclear@26 102 png_debug(5, "writing extra chunks\n");
nuclear@26 103
nuclear@26 104 for (up = info_ptr->unknown_chunks;
nuclear@26 105 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
nuclear@26 106 up++)
nuclear@26 107 {
nuclear@26 108 int keep=png_handle_as_unknown(png_ptr, up->name);
nuclear@26 109 if (keep != PNG_HANDLE_CHUNK_NEVER &&
nuclear@26 110 up->location && !(up->location & PNG_HAVE_PLTE) &&
nuclear@26 111 !(up->location & PNG_HAVE_IDAT) &&
nuclear@26 112 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
nuclear@26 113 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
nuclear@26 114 {
nuclear@26 115 if (up->size == 0)
nuclear@26 116 png_warning(png_ptr, "Writing zero-length unknown chunk");
nuclear@26 117 png_write_chunk(png_ptr, up->name, up->data, up->size);
nuclear@26 118 }
nuclear@26 119 }
nuclear@26 120 }
nuclear@26 121 #endif
nuclear@26 122 png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
nuclear@26 123 }
nuclear@26 124 }
nuclear@26 125
nuclear@26 126 void PNGAPI
nuclear@26 127 png_write_info(png_structp png_ptr, png_infop info_ptr)
nuclear@26 128 {
nuclear@26 129 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
nuclear@26 130 int i;
nuclear@26 131 #endif
nuclear@26 132
nuclear@26 133 png_debug(1, "in png_write_info\n");
nuclear@26 134
nuclear@26 135 if (png_ptr == NULL || info_ptr == NULL)
nuclear@26 136 return;
nuclear@26 137
nuclear@26 138 png_write_info_before_PLTE(png_ptr, info_ptr);
nuclear@26 139
nuclear@26 140 if (info_ptr->valid & PNG_INFO_PLTE)
nuclear@26 141 png_write_PLTE(png_ptr, info_ptr->palette,
nuclear@26 142 (png_uint_32)info_ptr->num_palette);
nuclear@26 143 else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@26 144 png_error(png_ptr, "Valid palette required for paletted images");
nuclear@26 145
nuclear@26 146 #if defined(PNG_WRITE_tRNS_SUPPORTED)
nuclear@26 147 if (info_ptr->valid & PNG_INFO_tRNS)
nuclear@26 148 {
nuclear@26 149 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
nuclear@26 150 /* invert the alpha channel (in tRNS) */
nuclear@26 151 if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
nuclear@26 152 info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@26 153 {
nuclear@26 154 int j;
nuclear@26 155 for (j=0; j<(int)info_ptr->num_trans; j++)
nuclear@26 156 info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
nuclear@26 157 }
nuclear@26 158 #endif
nuclear@26 159 png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
nuclear@26 160 info_ptr->num_trans, info_ptr->color_type);
nuclear@26 161 }
nuclear@26 162 #endif
nuclear@26 163 #if defined(PNG_WRITE_bKGD_SUPPORTED)
nuclear@26 164 if (info_ptr->valid & PNG_INFO_bKGD)
nuclear@26 165 png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
nuclear@26 166 #endif
nuclear@26 167 #if defined(PNG_WRITE_hIST_SUPPORTED)
nuclear@26 168 if (info_ptr->valid & PNG_INFO_hIST)
nuclear@26 169 png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
nuclear@26 170 #endif
nuclear@26 171 #if defined(PNG_WRITE_oFFs_SUPPORTED)
nuclear@26 172 if (info_ptr->valid & PNG_INFO_oFFs)
nuclear@26 173 png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
nuclear@26 174 info_ptr->offset_unit_type);
nuclear@26 175 #endif
nuclear@26 176 #if defined(PNG_WRITE_pCAL_SUPPORTED)
nuclear@26 177 if (info_ptr->valid & PNG_INFO_pCAL)
nuclear@26 178 png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
nuclear@26 179 info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
nuclear@26 180 info_ptr->pcal_units, info_ptr->pcal_params);
nuclear@26 181 #endif
nuclear@26 182 #if defined(PNG_WRITE_sCAL_SUPPORTED)
nuclear@26 183 if (info_ptr->valid & PNG_INFO_sCAL)
nuclear@26 184 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
nuclear@26 185 png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
nuclear@26 186 info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
nuclear@26 187 #else
nuclear@26 188 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26 189 png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
nuclear@26 190 info_ptr->scal_s_width, info_ptr->scal_s_height);
nuclear@26 191 #else
nuclear@26 192 png_warning(png_ptr,
nuclear@26 193 "png_write_sCAL not supported; sCAL chunk not written.");
nuclear@26 194 #endif
nuclear@26 195 #endif
nuclear@26 196 #endif
nuclear@26 197 #if defined(PNG_WRITE_pHYs_SUPPORTED)
nuclear@26 198 if (info_ptr->valid & PNG_INFO_pHYs)
nuclear@26 199 png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
nuclear@26 200 info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
nuclear@26 201 #endif
nuclear@26 202 #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@26 203 if (info_ptr->valid & PNG_INFO_tIME)
nuclear@26 204 {
nuclear@26 205 png_write_tIME(png_ptr, &(info_ptr->mod_time));
nuclear@26 206 png_ptr->mode |= PNG_WROTE_tIME;
nuclear@26 207 }
nuclear@26 208 #endif
nuclear@26 209 #if defined(PNG_WRITE_sPLT_SUPPORTED)
nuclear@26 210 if (info_ptr->valid & PNG_INFO_sPLT)
nuclear@26 211 for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
nuclear@26 212 png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
nuclear@26 213 #endif
nuclear@26 214 #if defined(PNG_WRITE_TEXT_SUPPORTED)
nuclear@26 215 /* Check to see if we need to write text chunks */
nuclear@26 216 for (i = 0; i < info_ptr->num_text; i++)
nuclear@26 217 {
nuclear@26 218 png_debug2(2, "Writing header text chunk %d, type %d\n", i,
nuclear@26 219 info_ptr->text[i].compression);
nuclear@26 220 /* an internationalized chunk? */
nuclear@26 221 if (info_ptr->text[i].compression > 0)
nuclear@26 222 {
nuclear@26 223 #if defined(PNG_WRITE_iTXt_SUPPORTED)
nuclear@26 224 /* write international chunk */
nuclear@26 225 png_write_iTXt(png_ptr,
nuclear@26 226 info_ptr->text[i].compression,
nuclear@26 227 info_ptr->text[i].key,
nuclear@26 228 info_ptr->text[i].lang,
nuclear@26 229 info_ptr->text[i].lang_key,
nuclear@26 230 info_ptr->text[i].text);
nuclear@26 231 #else
nuclear@26 232 png_warning(png_ptr, "Unable to write international text");
nuclear@26 233 #endif
nuclear@26 234 /* Mark this chunk as written */
nuclear@26 235 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@26 236 }
nuclear@26 237 /* If we want a compressed text chunk */
nuclear@26 238 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
nuclear@26 239 {
nuclear@26 240 #if defined(PNG_WRITE_zTXt_SUPPORTED)
nuclear@26 241 /* write compressed chunk */
nuclear@26 242 png_write_zTXt(png_ptr, info_ptr->text[i].key,
nuclear@26 243 info_ptr->text[i].text, 0,
nuclear@26 244 info_ptr->text[i].compression);
nuclear@26 245 #else
nuclear@26 246 png_warning(png_ptr, "Unable to write compressed text");
nuclear@26 247 #endif
nuclear@26 248 /* Mark this chunk as written */
nuclear@26 249 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
nuclear@26 250 }
nuclear@26 251 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
nuclear@26 252 {
nuclear@26 253 #if defined(PNG_WRITE_tEXt_SUPPORTED)
nuclear@26 254 /* write uncompressed chunk */
nuclear@26 255 png_write_tEXt(png_ptr, info_ptr->text[i].key,
nuclear@26 256 info_ptr->text[i].text,
nuclear@26 257 0);
nuclear@26 258 #else
nuclear@26 259 png_warning(png_ptr, "Unable to write uncompressed text");
nuclear@26 260 #endif
nuclear@26 261 /* Mark this chunk as written */
nuclear@26 262 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@26 263 }
nuclear@26 264 }
nuclear@26 265 #endif
nuclear@26 266 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26 267 if (info_ptr->unknown_chunks_num)
nuclear@26 268 {
nuclear@26 269 png_unknown_chunk *up;
nuclear@26 270
nuclear@26 271 png_debug(5, "writing extra chunks\n");
nuclear@26 272
nuclear@26 273 for (up = info_ptr->unknown_chunks;
nuclear@26 274 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
nuclear@26 275 up++)
nuclear@26 276 {
nuclear@26 277 int keep=png_handle_as_unknown(png_ptr, up->name);
nuclear@26 278 if (keep != PNG_HANDLE_CHUNK_NEVER &&
nuclear@26 279 up->location && (up->location & PNG_HAVE_PLTE) &&
nuclear@26 280 !(up->location & PNG_HAVE_IDAT) &&
nuclear@26 281 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
nuclear@26 282 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
nuclear@26 283 {
nuclear@26 284 png_write_chunk(png_ptr, up->name, up->data, up->size);
nuclear@26 285 }
nuclear@26 286 }
nuclear@26 287 }
nuclear@26 288 #endif
nuclear@26 289 }
nuclear@26 290
nuclear@26 291 /* Writes the end of the PNG file. If you don't want to write comments or
nuclear@26 292 * time information, you can pass NULL for info. If you already wrote these
nuclear@26 293 * in png_write_info(), do not write them again here. If you have long
nuclear@26 294 * comments, I suggest writing them here, and compressing them.
nuclear@26 295 */
nuclear@26 296 void PNGAPI
nuclear@26 297 png_write_end(png_structp png_ptr, png_infop info_ptr)
nuclear@26 298 {
nuclear@26 299 png_debug(1, "in png_write_end\n");
nuclear@26 300 if (png_ptr == NULL)
nuclear@26 301 return;
nuclear@26 302 if (!(png_ptr->mode & PNG_HAVE_IDAT))
nuclear@26 303 png_error(png_ptr, "No IDATs written into file");
nuclear@26 304
nuclear@26 305 /* see if user wants us to write information chunks */
nuclear@26 306 if (info_ptr != NULL)
nuclear@26 307 {
nuclear@26 308 #if defined(PNG_WRITE_TEXT_SUPPORTED)
nuclear@26 309 int i; /* local index variable */
nuclear@26 310 #endif
nuclear@26 311 #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@26 312 /* check to see if user has supplied a time chunk */
nuclear@26 313 if ((info_ptr->valid & PNG_INFO_tIME) &&
nuclear@26 314 !(png_ptr->mode & PNG_WROTE_tIME))
nuclear@26 315 png_write_tIME(png_ptr, &(info_ptr->mod_time));
nuclear@26 316 #endif
nuclear@26 317 #if defined(PNG_WRITE_TEXT_SUPPORTED)
nuclear@26 318 /* loop through comment chunks */
nuclear@26 319 for (i = 0; i < info_ptr->num_text; i++)
nuclear@26 320 {
nuclear@26 321 png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,
nuclear@26 322 info_ptr->text[i].compression);
nuclear@26 323 /* an internationalized chunk? */
nuclear@26 324 if (info_ptr->text[i].compression > 0)
nuclear@26 325 {
nuclear@26 326 #if defined(PNG_WRITE_iTXt_SUPPORTED)
nuclear@26 327 /* write international chunk */
nuclear@26 328 png_write_iTXt(png_ptr,
nuclear@26 329 info_ptr->text[i].compression,
nuclear@26 330 info_ptr->text[i].key,
nuclear@26 331 info_ptr->text[i].lang,
nuclear@26 332 info_ptr->text[i].lang_key,
nuclear@26 333 info_ptr->text[i].text);
nuclear@26 334 #else
nuclear@26 335 png_warning(png_ptr, "Unable to write international text");
nuclear@26 336 #endif
nuclear@26 337 /* Mark this chunk as written */
nuclear@26 338 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@26 339 }
nuclear@26 340 else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
nuclear@26 341 {
nuclear@26 342 #if defined(PNG_WRITE_zTXt_SUPPORTED)
nuclear@26 343 /* write compressed chunk */
nuclear@26 344 png_write_zTXt(png_ptr, info_ptr->text[i].key,
nuclear@26 345 info_ptr->text[i].text, 0,
nuclear@26 346 info_ptr->text[i].compression);
nuclear@26 347 #else
nuclear@26 348 png_warning(png_ptr, "Unable to write compressed text");
nuclear@26 349 #endif
nuclear@26 350 /* Mark this chunk as written */
nuclear@26 351 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
nuclear@26 352 }
nuclear@26 353 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
nuclear@26 354 {
nuclear@26 355 #if defined(PNG_WRITE_tEXt_SUPPORTED)
nuclear@26 356 /* write uncompressed chunk */
nuclear@26 357 png_write_tEXt(png_ptr, info_ptr->text[i].key,
nuclear@26 358 info_ptr->text[i].text, 0);
nuclear@26 359 #else
nuclear@26 360 png_warning(png_ptr, "Unable to write uncompressed text");
nuclear@26 361 #endif
nuclear@26 362
nuclear@26 363 /* Mark this chunk as written */
nuclear@26 364 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@26 365 }
nuclear@26 366 }
nuclear@26 367 #endif
nuclear@26 368 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26 369 if (info_ptr->unknown_chunks_num)
nuclear@26 370 {
nuclear@26 371 png_unknown_chunk *up;
nuclear@26 372
nuclear@26 373 png_debug(5, "writing extra chunks\n");
nuclear@26 374
nuclear@26 375 for (up = info_ptr->unknown_chunks;
nuclear@26 376 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
nuclear@26 377 up++)
nuclear@26 378 {
nuclear@26 379 int keep=png_handle_as_unknown(png_ptr, up->name);
nuclear@26 380 if (keep != PNG_HANDLE_CHUNK_NEVER &&
nuclear@26 381 up->location && (up->location & PNG_AFTER_IDAT) &&
nuclear@26 382 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
nuclear@26 383 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
nuclear@26 384 {
nuclear@26 385 png_write_chunk(png_ptr, up->name, up->data, up->size);
nuclear@26 386 }
nuclear@26 387 }
nuclear@26 388 }
nuclear@26 389 #endif
nuclear@26 390 }
nuclear@26 391
nuclear@26 392 png_ptr->mode |= PNG_AFTER_IDAT;
nuclear@26 393
nuclear@26 394 /* write end of PNG file */
nuclear@26 395 png_write_IEND(png_ptr);
nuclear@26 396 /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
nuclear@26 397 * and restored again in libpng-1.2.30, may cause some applications that
nuclear@26 398 * do not set png_ptr->output_flush_fn to crash. If your application
nuclear@26 399 * experiences a problem, please try building libpng with
nuclear@26 400 * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
nuclear@26 401 * png-mng-implement at lists.sf.net . This kludge will be removed
nuclear@26 402 * from libpng-1.4.0.
nuclear@26 403 */
nuclear@26 404 #if defined(PNG_WRITE_FLUSH_SUPPORTED) && \
nuclear@26 405 defined(PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED)
nuclear@26 406 png_flush(png_ptr);
nuclear@26 407 #endif
nuclear@26 408 }
nuclear@26 409
nuclear@26 410 #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@26 411 #if !defined(_WIN32_WCE)
nuclear@26 412 /* "time.h" functions are not supported on WindowsCE */
nuclear@26 413 void PNGAPI
nuclear@26 414 png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
nuclear@26 415 {
nuclear@26 416 png_debug(1, "in png_convert_from_struct_tm\n");
nuclear@26 417 ptime->year = (png_uint_16)(1900 + ttime->tm_year);
nuclear@26 418 ptime->month = (png_byte)(ttime->tm_mon + 1);
nuclear@26 419 ptime->day = (png_byte)ttime->tm_mday;
nuclear@26 420 ptime->hour = (png_byte)ttime->tm_hour;
nuclear@26 421 ptime->minute = (png_byte)ttime->tm_min;
nuclear@26 422 ptime->second = (png_byte)ttime->tm_sec;
nuclear@26 423 }
nuclear@26 424
nuclear@26 425 void PNGAPI
nuclear@26 426 png_convert_from_time_t(png_timep ptime, time_t ttime)
nuclear@26 427 {
nuclear@26 428 struct tm *tbuf;
nuclear@26 429
nuclear@26 430 png_debug(1, "in png_convert_from_time_t\n");
nuclear@26 431 tbuf = gmtime(&ttime);
nuclear@26 432 png_convert_from_struct_tm(ptime, tbuf);
nuclear@26 433 }
nuclear@26 434 #endif
nuclear@26 435 #endif
nuclear@26 436
nuclear@26 437 /* Initialize png_ptr structure, and allocate any memory needed */
nuclear@26 438 png_structp PNGAPI
nuclear@26 439 png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@26 440 png_error_ptr error_fn, png_error_ptr warn_fn)
nuclear@26 441 {
nuclear@26 442 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 443 return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
nuclear@26 444 warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
nuclear@26 445 }
nuclear@26 446
nuclear@26 447 /* Alternate initialize png_ptr structure, and allocate any memory needed */
nuclear@26 448 png_structp PNGAPI
nuclear@26 449 png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@26 450 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
nuclear@26 451 png_malloc_ptr malloc_fn, png_free_ptr free_fn)
nuclear@26 452 {
nuclear@26 453 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 454 #ifdef PNG_SETJMP_SUPPORTED
nuclear@26 455 volatile
nuclear@26 456 #endif
nuclear@26 457 png_structp png_ptr;
nuclear@26 458 #ifdef PNG_SETJMP_SUPPORTED
nuclear@26 459 #ifdef USE_FAR_KEYWORD
nuclear@26 460 jmp_buf jmpbuf;
nuclear@26 461 #endif
nuclear@26 462 #endif
nuclear@26 463 int i;
nuclear@26 464 png_debug(1, "in png_create_write_struct\n");
nuclear@26 465 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 466 png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
nuclear@26 467 (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
nuclear@26 468 #else
nuclear@26 469 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@26 470 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 471 if (png_ptr == NULL)
nuclear@26 472 return (NULL);
nuclear@26 473
nuclear@26 474 /* added at libpng-1.2.6 */
nuclear@26 475 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@26 476 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@26 477 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@26 478 #endif
nuclear@26 479
nuclear@26 480 #ifdef PNG_SETJMP_SUPPORTED
nuclear@26 481 #ifdef USE_FAR_KEYWORD
nuclear@26 482 if (setjmp(jmpbuf))
nuclear@26 483 #else
nuclear@26 484 if (setjmp(png_ptr->jmpbuf))
nuclear@26 485 #endif
nuclear@26 486 {
nuclear@26 487 png_free(png_ptr, png_ptr->zbuf);
nuclear@26 488 png_ptr->zbuf=NULL;
nuclear@26 489 png_destroy_struct(png_ptr);
nuclear@26 490 return (NULL);
nuclear@26 491 }
nuclear@26 492 #ifdef USE_FAR_KEYWORD
nuclear@26 493 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@26 494 #endif
nuclear@26 495 #endif
nuclear@26 496
nuclear@26 497 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 498 png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
nuclear@26 499 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@26 500 png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
nuclear@26 501
nuclear@26 502 if (user_png_ver)
nuclear@26 503 {
nuclear@26 504 i=0;
nuclear@26 505 do
nuclear@26 506 {
nuclear@26 507 if (user_png_ver[i] != png_libpng_ver[i])
nuclear@26 508 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@26 509 } while (png_libpng_ver[i++]);
nuclear@26 510 }
nuclear@26 511
nuclear@26 512 if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
nuclear@26 513 {
nuclear@26 514 /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
nuclear@26 515 * we must recompile any applications that use any older library version.
nuclear@26 516 * For versions after libpng 1.0, we will be compatible, so we need
nuclear@26 517 * only check the first digit.
nuclear@26 518 */
nuclear@26 519 if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
nuclear@26 520 (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
nuclear@26 521 (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
nuclear@26 522 {
nuclear@26 523 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@26 524 char msg[80];
nuclear@26 525 if (user_png_ver)
nuclear@26 526 {
nuclear@26 527 png_snprintf(msg, 80,
nuclear@26 528 "Application was compiled with png.h from libpng-%.20s",
nuclear@26 529 user_png_ver);
nuclear@26 530 png_warning(png_ptr, msg);
nuclear@26 531 }
nuclear@26 532 png_snprintf(msg, 80,
nuclear@26 533 "Application is running with png.c from libpng-%.20s",
nuclear@26 534 png_libpng_ver);
nuclear@26 535 png_warning(png_ptr, msg);
nuclear@26 536 #endif
nuclear@26 537 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@26 538 png_ptr->flags=0;
nuclear@26 539 #endif
nuclear@26 540 png_error(png_ptr,
nuclear@26 541 "Incompatible libpng version in application and library");
nuclear@26 542 }
nuclear@26 543 }
nuclear@26 544
nuclear@26 545 /* initialize zbuf - compression buffer */
nuclear@26 546 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@26 547 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@26 548 (png_uint_32)png_ptr->zbuf_size);
nuclear@26 549
nuclear@26 550 png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
nuclear@26 551 png_flush_ptr_NULL);
nuclear@26 552
nuclear@26 553 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@26 554 png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
nuclear@26 555 1, png_doublep_NULL, png_doublep_NULL);
nuclear@26 556 #endif
nuclear@26 557
nuclear@26 558 #ifdef PNG_SETJMP_SUPPORTED
nuclear@26 559 /* Applications that neglect to set up their own setjmp() and then encounter
nuclear@26 560 a png_error() will longjmp here. Since the jmpbuf is then meaningless we
nuclear@26 561 abort instead of returning. */
nuclear@26 562 #ifdef USE_FAR_KEYWORD
nuclear@26 563 if (setjmp(jmpbuf))
nuclear@26 564 PNG_ABORT();
nuclear@26 565 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@26 566 #else
nuclear@26 567 if (setjmp(png_ptr->jmpbuf))
nuclear@26 568 PNG_ABORT();
nuclear@26 569 #endif
nuclear@26 570 #endif
nuclear@26 571 return (png_ptr);
nuclear@26 572 }
nuclear@26 573
nuclear@26 574 /* Initialize png_ptr structure, and allocate any memory needed */
nuclear@26 575 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
nuclear@26 576 /* Deprecated. */
nuclear@26 577 #undef png_write_init
nuclear@26 578 void PNGAPI
nuclear@26 579 png_write_init(png_structp png_ptr)
nuclear@26 580 {
nuclear@26 581 /* We only come here via pre-1.0.7-compiled applications */
nuclear@26 582 png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
nuclear@26 583 }
nuclear@26 584
nuclear@26 585 void PNGAPI
nuclear@26 586 png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
nuclear@26 587 png_size_t png_struct_size, png_size_t png_info_size)
nuclear@26 588 {
nuclear@26 589 /* We only come here via pre-1.0.12-compiled applications */
nuclear@26 590 if (png_ptr == NULL) return;
nuclear@26 591 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@26 592 if (png_sizeof(png_struct) > png_struct_size ||
nuclear@26 593 png_sizeof(png_info) > png_info_size)
nuclear@26 594 {
nuclear@26 595 char msg[80];
nuclear@26 596 png_ptr->warning_fn=NULL;
nuclear@26 597 if (user_png_ver)
nuclear@26 598 {
nuclear@26 599 png_snprintf(msg, 80,
nuclear@26 600 "Application was compiled with png.h from libpng-%.20s",
nuclear@26 601 user_png_ver);
nuclear@26 602 png_warning(png_ptr, msg);
nuclear@26 603 }
nuclear@26 604 png_snprintf(msg, 80,
nuclear@26 605 "Application is running with png.c from libpng-%.20s",
nuclear@26 606 png_libpng_ver);
nuclear@26 607 png_warning(png_ptr, msg);
nuclear@26 608 }
nuclear@26 609 #endif
nuclear@26 610 if (png_sizeof(png_struct) > png_struct_size)
nuclear@26 611 {
nuclear@26 612 png_ptr->error_fn=NULL;
nuclear@26 613 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@26 614 png_ptr->flags=0;
nuclear@26 615 #endif
nuclear@26 616 png_error(png_ptr,
nuclear@26 617 "The png struct allocated by the application for writing is too small.");
nuclear@26 618 }
nuclear@26 619 if (png_sizeof(png_info) > png_info_size)
nuclear@26 620 {
nuclear@26 621 png_ptr->error_fn=NULL;
nuclear@26 622 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@26 623 png_ptr->flags=0;
nuclear@26 624 #endif
nuclear@26 625 png_error(png_ptr,
nuclear@26 626 "The info struct allocated by the application for writing is too small.");
nuclear@26 627 }
nuclear@26 628 png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
nuclear@26 629 }
nuclear@26 630 #endif /* PNG_1_0_X || PNG_1_2_X */
nuclear@26 631
nuclear@26 632
nuclear@26 633 void PNGAPI
nuclear@26 634 png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
nuclear@26 635 png_size_t png_struct_size)
nuclear@26 636 {
nuclear@26 637 png_structp png_ptr=*ptr_ptr;
nuclear@26 638 #ifdef PNG_SETJMP_SUPPORTED
nuclear@26 639 jmp_buf tmp_jmp; /* to save current jump buffer */
nuclear@26 640 #endif
nuclear@26 641
nuclear@26 642 int i = 0;
nuclear@26 643
nuclear@26 644 if (png_ptr == NULL)
nuclear@26 645 return;
nuclear@26 646
nuclear@26 647 do
nuclear@26 648 {
nuclear@26 649 if (user_png_ver[i] != png_libpng_ver[i])
nuclear@26 650 {
nuclear@26 651 #ifdef PNG_LEGACY_SUPPORTED
nuclear@26 652 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@26 653 #else
nuclear@26 654 png_ptr->warning_fn=NULL;
nuclear@26 655 png_warning(png_ptr,
nuclear@26 656 "Application uses deprecated png_write_init() and should be recompiled.");
nuclear@26 657 break;
nuclear@26 658 #endif
nuclear@26 659 }
nuclear@26 660 } while (png_libpng_ver[i++]);
nuclear@26 661
nuclear@26 662 png_debug(1, "in png_write_init_3\n");
nuclear@26 663
nuclear@26 664 #ifdef PNG_SETJMP_SUPPORTED
nuclear@26 665 /* save jump buffer and error functions */
nuclear@26 666 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@26 667 #endif
nuclear@26 668
nuclear@26 669 if (png_sizeof(png_struct) > png_struct_size)
nuclear@26 670 {
nuclear@26 671 png_destroy_struct(png_ptr);
nuclear@26 672 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@26 673 *ptr_ptr = png_ptr;
nuclear@26 674 }
nuclear@26 675
nuclear@26 676 /* reset all variables to 0 */
nuclear@26 677 png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@26 678
nuclear@26 679 /* added at libpng-1.2.6 */
nuclear@26 680 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@26 681 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@26 682 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@26 683 #endif
nuclear@26 684
nuclear@26 685 #ifdef PNG_SETJMP_SUPPORTED
nuclear@26 686 /* restore jump buffer */
nuclear@26 687 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@26 688 #endif
nuclear@26 689
nuclear@26 690 png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
nuclear@26 691 png_flush_ptr_NULL);
nuclear@26 692
nuclear@26 693 /* initialize zbuf - compression buffer */
nuclear@26 694 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@26 695 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@26 696 (png_uint_32)png_ptr->zbuf_size);
nuclear@26 697
nuclear@26 698 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@26 699 png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
nuclear@26 700 1, png_doublep_NULL, png_doublep_NULL);
nuclear@26 701 #endif
nuclear@26 702 }
nuclear@26 703
nuclear@26 704 /* Write a few rows of image data. If the image is interlaced,
nuclear@26 705 * either you will have to write the 7 sub images, or, if you
nuclear@26 706 * have called png_set_interlace_handling(), you will have to
nuclear@26 707 * "write" the image seven times.
nuclear@26 708 */
nuclear@26 709 void PNGAPI
nuclear@26 710 png_write_rows(png_structp png_ptr, png_bytepp row,
nuclear@26 711 png_uint_32 num_rows)
nuclear@26 712 {
nuclear@26 713 png_uint_32 i; /* row counter */
nuclear@26 714 png_bytepp rp; /* row pointer */
nuclear@26 715
nuclear@26 716 png_debug(1, "in png_write_rows\n");
nuclear@26 717
nuclear@26 718 if (png_ptr == NULL)
nuclear@26 719 return;
nuclear@26 720
nuclear@26 721 /* loop through the rows */
nuclear@26 722 for (i = 0, rp = row; i < num_rows; i++, rp++)
nuclear@26 723 {
nuclear@26 724 png_write_row(png_ptr, *rp);
nuclear@26 725 }
nuclear@26 726 }
nuclear@26 727
nuclear@26 728 /* Write the image. You only need to call this function once, even
nuclear@26 729 * if you are writing an interlaced image.
nuclear@26 730 */
nuclear@26 731 void PNGAPI
nuclear@26 732 png_write_image(png_structp png_ptr, png_bytepp image)
nuclear@26 733 {
nuclear@26 734 png_uint_32 i; /* row index */
nuclear@26 735 int pass, num_pass; /* pass variables */
nuclear@26 736 png_bytepp rp; /* points to current row */
nuclear@26 737
nuclear@26 738 if (png_ptr == NULL)
nuclear@26 739 return;
nuclear@26 740
nuclear@26 741 png_debug(1, "in png_write_image\n");
nuclear@26 742 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@26 743 /* intialize interlace handling. If image is not interlaced,
nuclear@26 744 this will set pass to 1 */
nuclear@26 745 num_pass = png_set_interlace_handling(png_ptr);
nuclear@26 746 #else
nuclear@26 747 num_pass = 1;
nuclear@26 748 #endif
nuclear@26 749 /* loop through passes */
nuclear@26 750 for (pass = 0; pass < num_pass; pass++)
nuclear@26 751 {
nuclear@26 752 /* loop through image */
nuclear@26 753 for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
nuclear@26 754 {
nuclear@26 755 png_write_row(png_ptr, *rp);
nuclear@26 756 }
nuclear@26 757 }
nuclear@26 758 }
nuclear@26 759
nuclear@26 760 /* called by user to write a row of image data */
nuclear@26 761 void PNGAPI
nuclear@26 762 png_write_row(png_structp png_ptr, png_bytep row)
nuclear@26 763 {
nuclear@26 764 if (png_ptr == NULL)
nuclear@26 765 return;
nuclear@26 766 png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
nuclear@26 767 png_ptr->row_number, png_ptr->pass);
nuclear@26 768
nuclear@26 769 /* initialize transformations and other stuff if first time */
nuclear@26 770 if (png_ptr->row_number == 0 && png_ptr->pass == 0)
nuclear@26 771 {
nuclear@26 772 /* make sure we wrote the header info */
nuclear@26 773 if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
nuclear@26 774 png_error(png_ptr,
nuclear@26 775 "png_write_info was never called before png_write_row.");
nuclear@26 776
nuclear@26 777 /* check for transforms that have been set but were defined out */
nuclear@26 778 #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
nuclear@26 779 if (png_ptr->transformations & PNG_INVERT_MONO)
nuclear@26 780 png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
nuclear@26 781 #endif
nuclear@26 782 #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
nuclear@26 783 if (png_ptr->transformations & PNG_FILLER)
nuclear@26 784 png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
nuclear@26 785 #endif
nuclear@26 786 #if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@26 787 if (png_ptr->transformations & PNG_PACKSWAP)
nuclear@26 788 png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
nuclear@26 789 #endif
nuclear@26 790 #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
nuclear@26 791 if (png_ptr->transformations & PNG_PACK)
nuclear@26 792 png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
nuclear@26 793 #endif
nuclear@26 794 #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@26 795 if (png_ptr->transformations & PNG_SHIFT)
nuclear@26 796 png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
nuclear@26 797 #endif
nuclear@26 798 #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
nuclear@26 799 if (png_ptr->transformations & PNG_BGR)
nuclear@26 800 png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
nuclear@26 801 #endif
nuclear@26 802 #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
nuclear@26 803 if (png_ptr->transformations & PNG_SWAP_BYTES)
nuclear@26 804 png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
nuclear@26 805 #endif
nuclear@26 806
nuclear@26 807 png_write_start_row(png_ptr);
nuclear@26 808 }
nuclear@26 809
nuclear@26 810 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@26 811 /* if interlaced and not interested in row, return */
nuclear@26 812 if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
nuclear@26 813 {
nuclear@26 814 switch (png_ptr->pass)
nuclear@26 815 {
nuclear@26 816 case 0:
nuclear@26 817 if (png_ptr->row_number & 0x07)
nuclear@26 818 {
nuclear@26 819 png_write_finish_row(png_ptr);
nuclear@26 820 return;
nuclear@26 821 }
nuclear@26 822 break;
nuclear@26 823 case 1:
nuclear@26 824 if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
nuclear@26 825 {
nuclear@26 826 png_write_finish_row(png_ptr);
nuclear@26 827 return;
nuclear@26 828 }
nuclear@26 829 break;
nuclear@26 830 case 2:
nuclear@26 831 if ((png_ptr->row_number & 0x07) != 4)
nuclear@26 832 {
nuclear@26 833 png_write_finish_row(png_ptr);
nuclear@26 834 return;
nuclear@26 835 }
nuclear@26 836 break;
nuclear@26 837 case 3:
nuclear@26 838 if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
nuclear@26 839 {
nuclear@26 840 png_write_finish_row(png_ptr);
nuclear@26 841 return;
nuclear@26 842 }
nuclear@26 843 break;
nuclear@26 844 case 4:
nuclear@26 845 if ((png_ptr->row_number & 0x03) != 2)
nuclear@26 846 {
nuclear@26 847 png_write_finish_row(png_ptr);
nuclear@26 848 return;
nuclear@26 849 }
nuclear@26 850 break;
nuclear@26 851 case 5:
nuclear@26 852 if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
nuclear@26 853 {
nuclear@26 854 png_write_finish_row(png_ptr);
nuclear@26 855 return;
nuclear@26 856 }
nuclear@26 857 break;
nuclear@26 858 case 6:
nuclear@26 859 if (!(png_ptr->row_number & 0x01))
nuclear@26 860 {
nuclear@26 861 png_write_finish_row(png_ptr);
nuclear@26 862 return;
nuclear@26 863 }
nuclear@26 864 break;
nuclear@26 865 }
nuclear@26 866 }
nuclear@26 867 #endif
nuclear@26 868
nuclear@26 869 /* set up row info for transformations */
nuclear@26 870 png_ptr->row_info.color_type = png_ptr->color_type;
nuclear@26 871 png_ptr->row_info.width = png_ptr->usr_width;
nuclear@26 872 png_ptr->row_info.channels = png_ptr->usr_channels;
nuclear@26 873 png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
nuclear@26 874 png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
nuclear@26 875 png_ptr->row_info.channels);
nuclear@26 876
nuclear@26 877 png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
nuclear@26 878 png_ptr->row_info.width);
nuclear@26 879
nuclear@26 880 png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
nuclear@26 881 png_debug1(3, "row_info->width = %lu\n", png_ptr->row_info.width);
nuclear@26 882 png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);
nuclear@26 883 png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
nuclear@26 884 png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
nuclear@26 885 png_debug1(3, "row_info->rowbytes = %lu\n", png_ptr->row_info.rowbytes);
nuclear@26 886
nuclear@26 887 /* Copy user's row into buffer, leaving room for filter byte. */
nuclear@26 888 png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
nuclear@26 889 png_ptr->row_info.rowbytes);
nuclear@26 890
nuclear@26 891 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@26 892 /* handle interlacing */
nuclear@26 893 if (png_ptr->interlaced && png_ptr->pass < 6 &&
nuclear@26 894 (png_ptr->transformations & PNG_INTERLACE))
nuclear@26 895 {
nuclear@26 896 png_do_write_interlace(&(png_ptr->row_info),
nuclear@26 897 png_ptr->row_buf + 1, png_ptr->pass);
nuclear@26 898 /* this should always get caught above, but still ... */
nuclear@26 899 if (!(png_ptr->row_info.width))
nuclear@26 900 {
nuclear@26 901 png_write_finish_row(png_ptr);
nuclear@26 902 return;
nuclear@26 903 }
nuclear@26 904 }
nuclear@26 905 #endif
nuclear@26 906
nuclear@26 907 /* handle other transformations */
nuclear@26 908 if (png_ptr->transformations)
nuclear@26 909 png_do_write_transformations(png_ptr);
nuclear@26 910
nuclear@26 911 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@26 912 /* Write filter_method 64 (intrapixel differencing) only if
nuclear@26 913 * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
nuclear@26 914 * 2. Libpng did not write a PNG signature (this filter_method is only
nuclear@26 915 * used in PNG datastreams that are embedded in MNG datastreams) and
nuclear@26 916 * 3. The application called png_permit_mng_features with a mask that
nuclear@26 917 * included PNG_FLAG_MNG_FILTER_64 and
nuclear@26 918 * 4. The filter_method is 64 and
nuclear@26 919 * 5. The color_type is RGB or RGBA
nuclear@26 920 */
nuclear@26 921 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
nuclear@26 922 (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
nuclear@26 923 {
nuclear@26 924 /* Intrapixel differencing */
nuclear@26 925 png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
nuclear@26 926 }
nuclear@26 927 #endif
nuclear@26 928
nuclear@26 929 /* Find a filter if necessary, filter the row and write it out. */
nuclear@26 930 png_write_find_filter(png_ptr, &(png_ptr->row_info));
nuclear@26 931
nuclear@26 932 if (png_ptr->write_row_fn != NULL)
nuclear@26 933 (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
nuclear@26 934 }
nuclear@26 935
nuclear@26 936 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@26 937 /* Set the automatic flush interval or 0 to turn flushing off */
nuclear@26 938 void PNGAPI
nuclear@26 939 png_set_flush(png_structp png_ptr, int nrows)
nuclear@26 940 {
nuclear@26 941 png_debug(1, "in png_set_flush\n");
nuclear@26 942 if (png_ptr == NULL)
nuclear@26 943 return;
nuclear@26 944 png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
nuclear@26 945 }
nuclear@26 946
nuclear@26 947 /* flush the current output buffers now */
nuclear@26 948 void PNGAPI
nuclear@26 949 png_write_flush(png_structp png_ptr)
nuclear@26 950 {
nuclear@26 951 int wrote_IDAT;
nuclear@26 952
nuclear@26 953 png_debug(1, "in png_write_flush\n");
nuclear@26 954 if (png_ptr == NULL)
nuclear@26 955 return;
nuclear@26 956 /* We have already written out all of the data */
nuclear@26 957 if (png_ptr->row_number >= png_ptr->num_rows)
nuclear@26 958 return;
nuclear@26 959
nuclear@26 960 do
nuclear@26 961 {
nuclear@26 962 int ret;
nuclear@26 963
nuclear@26 964 /* compress the data */
nuclear@26 965 ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
nuclear@26 966 wrote_IDAT = 0;
nuclear@26 967
nuclear@26 968 /* check for compression errors */
nuclear@26 969 if (ret != Z_OK)
nuclear@26 970 {
nuclear@26 971 if (png_ptr->zstream.msg != NULL)
nuclear@26 972 png_error(png_ptr, png_ptr->zstream.msg);
nuclear@26 973 else
nuclear@26 974 png_error(png_ptr, "zlib error");
nuclear@26 975 }
nuclear@26 976
nuclear@26 977 if (!(png_ptr->zstream.avail_out))
nuclear@26 978 {
nuclear@26 979 /* write the IDAT and reset the zlib output buffer */
nuclear@26 980 png_write_IDAT(png_ptr, png_ptr->zbuf,
nuclear@26 981 png_ptr->zbuf_size);
nuclear@26 982 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@26 983 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@26 984 wrote_IDAT = 1;
nuclear@26 985 }
nuclear@26 986 } while(wrote_IDAT == 1);
nuclear@26 987
nuclear@26 988 /* If there is any data left to be output, write it into a new IDAT */
nuclear@26 989 if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
nuclear@26 990 {
nuclear@26 991 /* write the IDAT and reset the zlib output buffer */
nuclear@26 992 png_write_IDAT(png_ptr, png_ptr->zbuf,
nuclear@26 993 png_ptr->zbuf_size - png_ptr->zstream.avail_out);
nuclear@26 994 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@26 995 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@26 996 }
nuclear@26 997 png_ptr->flush_rows = 0;
nuclear@26 998 png_flush(png_ptr);
nuclear@26 999 }
nuclear@26 1000 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
nuclear@26 1001
nuclear@26 1002 /* free all memory used by the write */
nuclear@26 1003 void PNGAPI
nuclear@26 1004 png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
nuclear@26 1005 {
nuclear@26 1006 png_structp png_ptr = NULL;
nuclear@26 1007 png_infop info_ptr = NULL;
nuclear@26 1008 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 1009 png_free_ptr free_fn = NULL;
nuclear@26 1010 png_voidp mem_ptr = NULL;
nuclear@26 1011 #endif
nuclear@26 1012
nuclear@26 1013 png_debug(1, "in png_destroy_write_struct\n");
nuclear@26 1014 if (png_ptr_ptr != NULL)
nuclear@26 1015 {
nuclear@26 1016 png_ptr = *png_ptr_ptr;
nuclear@26 1017 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 1018 free_fn = png_ptr->free_fn;
nuclear@26 1019 mem_ptr = png_ptr->mem_ptr;
nuclear@26 1020 #endif
nuclear@26 1021 }
nuclear@26 1022
nuclear@26 1023 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 1024 if (png_ptr != NULL)
nuclear@26 1025 {
nuclear@26 1026 free_fn = png_ptr->free_fn;
nuclear@26 1027 mem_ptr = png_ptr->mem_ptr;
nuclear@26 1028 }
nuclear@26 1029 #endif
nuclear@26 1030
nuclear@26 1031 if (info_ptr_ptr != NULL)
nuclear@26 1032 info_ptr = *info_ptr_ptr;
nuclear@26 1033
nuclear@26 1034 if (info_ptr != NULL)
nuclear@26 1035 {
nuclear@26 1036 if (png_ptr != NULL)
nuclear@26 1037 {
nuclear@26 1038 png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
nuclear@26 1039
nuclear@26 1040 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26 1041 if (png_ptr->num_chunk_list)
nuclear@26 1042 {
nuclear@26 1043 png_free(png_ptr, png_ptr->chunk_list);
nuclear@26 1044 png_ptr->chunk_list=NULL;
nuclear@26 1045 png_ptr->num_chunk_list = 0;
nuclear@26 1046 }
nuclear@26 1047 #endif
nuclear@26 1048 }
nuclear@26 1049
nuclear@26 1050 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 1051 png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
nuclear@26 1052 (png_voidp)mem_ptr);
nuclear@26 1053 #else
nuclear@26 1054 png_destroy_struct((png_voidp)info_ptr);
nuclear@26 1055 #endif
nuclear@26 1056 *info_ptr_ptr = NULL;
nuclear@26 1057 }
nuclear@26 1058
nuclear@26 1059 if (png_ptr != NULL)
nuclear@26 1060 {
nuclear@26 1061 png_write_destroy(png_ptr);
nuclear@26 1062 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 1063 png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
nuclear@26 1064 (png_voidp)mem_ptr);
nuclear@26 1065 #else
nuclear@26 1066 png_destroy_struct((png_voidp)png_ptr);
nuclear@26 1067 #endif
nuclear@26 1068 *png_ptr_ptr = NULL;
nuclear@26 1069 }
nuclear@26 1070 }
nuclear@26 1071
nuclear@26 1072
nuclear@26 1073 /* Free any memory used in png_ptr struct (old method) */
nuclear@26 1074 void /* PRIVATE */
nuclear@26 1075 png_write_destroy(png_structp png_ptr)
nuclear@26 1076 {
nuclear@26 1077 #ifdef PNG_SETJMP_SUPPORTED
nuclear@26 1078 jmp_buf tmp_jmp; /* save jump buffer */
nuclear@26 1079 #endif
nuclear@26 1080 png_error_ptr error_fn;
nuclear@26 1081 png_error_ptr warning_fn;
nuclear@26 1082 png_voidp error_ptr;
nuclear@26 1083 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 1084 png_free_ptr free_fn;
nuclear@26 1085 #endif
nuclear@26 1086
nuclear@26 1087 png_debug(1, "in png_write_destroy\n");
nuclear@26 1088 /* free any memory zlib uses */
nuclear@26 1089 deflateEnd(&png_ptr->zstream);
nuclear@26 1090
nuclear@26 1091 /* free our memory. png_free checks NULL for us. */
nuclear@26 1092 png_free(png_ptr, png_ptr->zbuf);
nuclear@26 1093 png_free(png_ptr, png_ptr->row_buf);
nuclear@26 1094 #ifndef PNG_NO_WRITE_FILTER
nuclear@26 1095 png_free(png_ptr, png_ptr->prev_row);
nuclear@26 1096 png_free(png_ptr, png_ptr->sub_row);
nuclear@26 1097 png_free(png_ptr, png_ptr->up_row);
nuclear@26 1098 png_free(png_ptr, png_ptr->avg_row);
nuclear@26 1099 png_free(png_ptr, png_ptr->paeth_row);
nuclear@26 1100 #endif
nuclear@26 1101
nuclear@26 1102 #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@26 1103 png_free(png_ptr, png_ptr->time_buffer);
nuclear@26 1104 #endif
nuclear@26 1105
nuclear@26 1106 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@26 1107 png_free(png_ptr, png_ptr->prev_filters);
nuclear@26 1108 png_free(png_ptr, png_ptr->filter_weights);
nuclear@26 1109 png_free(png_ptr, png_ptr->inv_filter_weights);
nuclear@26 1110 png_free(png_ptr, png_ptr->filter_costs);
nuclear@26 1111 png_free(png_ptr, png_ptr->inv_filter_costs);
nuclear@26 1112 #endif
nuclear@26 1113
nuclear@26 1114 #ifdef PNG_SETJMP_SUPPORTED
nuclear@26 1115 /* reset structure */
nuclear@26 1116 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@26 1117 #endif
nuclear@26 1118
nuclear@26 1119 error_fn = png_ptr->error_fn;
nuclear@26 1120 warning_fn = png_ptr->warning_fn;
nuclear@26 1121 error_ptr = png_ptr->error_ptr;
nuclear@26 1122 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 1123 free_fn = png_ptr->free_fn;
nuclear@26 1124 #endif
nuclear@26 1125
nuclear@26 1126 png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@26 1127
nuclear@26 1128 png_ptr->error_fn = error_fn;
nuclear@26 1129 png_ptr->warning_fn = warning_fn;
nuclear@26 1130 png_ptr->error_ptr = error_ptr;
nuclear@26 1131 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 1132 png_ptr->free_fn = free_fn;
nuclear@26 1133 #endif
nuclear@26 1134
nuclear@26 1135 #ifdef PNG_SETJMP_SUPPORTED
nuclear@26 1136 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@26 1137 #endif
nuclear@26 1138 }
nuclear@26 1139
nuclear@26 1140 /* Allow the application to select one or more row filters to use. */
nuclear@26 1141 void PNGAPI
nuclear@26 1142 png_set_filter(png_structp png_ptr, int method, int filters)
nuclear@26 1143 {
nuclear@26 1144 png_debug(1, "in png_set_filter\n");
nuclear@26 1145 if (png_ptr == NULL)
nuclear@26 1146 return;
nuclear@26 1147 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@26 1148 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
nuclear@26 1149 (method == PNG_INTRAPIXEL_DIFFERENCING))
nuclear@26 1150 method = PNG_FILTER_TYPE_BASE;
nuclear@26 1151 #endif
nuclear@26 1152 if (method == PNG_FILTER_TYPE_BASE)
nuclear@26 1153 {
nuclear@26 1154 switch (filters & (PNG_ALL_FILTERS | 0x07))
nuclear@26 1155 {
nuclear@26 1156 #ifndef PNG_NO_WRITE_FILTER
nuclear@26 1157 case 5:
nuclear@26 1158 case 6:
nuclear@26 1159 case 7: png_warning(png_ptr, "Unknown row filter for method 0");
nuclear@26 1160 #endif /* PNG_NO_WRITE_FILTER */
nuclear@26 1161 case PNG_FILTER_VALUE_NONE:
nuclear@26 1162 png_ptr->do_filter=PNG_FILTER_NONE; break;
nuclear@26 1163 #ifndef PNG_NO_WRITE_FILTER
nuclear@26 1164 case PNG_FILTER_VALUE_SUB:
nuclear@26 1165 png_ptr->do_filter=PNG_FILTER_SUB; break;
nuclear@26 1166 case PNG_FILTER_VALUE_UP:
nuclear@26 1167 png_ptr->do_filter=PNG_FILTER_UP; break;
nuclear@26 1168 case PNG_FILTER_VALUE_AVG:
nuclear@26 1169 png_ptr->do_filter=PNG_FILTER_AVG; break;
nuclear@26 1170 case PNG_FILTER_VALUE_PAETH:
nuclear@26 1171 png_ptr->do_filter=PNG_FILTER_PAETH; break;
nuclear@26 1172 default: png_ptr->do_filter = (png_byte)filters; break;
nuclear@26 1173 #else
nuclear@26 1174 default: png_warning(png_ptr, "Unknown row filter for method 0");
nuclear@26 1175 #endif /* PNG_NO_WRITE_FILTER */
nuclear@26 1176 }
nuclear@26 1177
nuclear@26 1178 /* If we have allocated the row_buf, this means we have already started
nuclear@26 1179 * with the image and we should have allocated all of the filter buffers
nuclear@26 1180 * that have been selected. If prev_row isn't already allocated, then
nuclear@26 1181 * it is too late to start using the filters that need it, since we
nuclear@26 1182 * will be missing the data in the previous row. If an application
nuclear@26 1183 * wants to start and stop using particular filters during compression,
nuclear@26 1184 * it should start out with all of the filters, and then add and
nuclear@26 1185 * remove them after the start of compression.
nuclear@26 1186 */
nuclear@26 1187 if (png_ptr->row_buf != NULL)
nuclear@26 1188 {
nuclear@26 1189 #ifndef PNG_NO_WRITE_FILTER
nuclear@26 1190 if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
nuclear@26 1191 {
nuclear@26 1192 png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
nuclear@26 1193 (png_ptr->rowbytes + 1));
nuclear@26 1194 png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
nuclear@26 1195 }
nuclear@26 1196
nuclear@26 1197 if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
nuclear@26 1198 {
nuclear@26 1199 if (png_ptr->prev_row == NULL)
nuclear@26 1200 {
nuclear@26 1201 png_warning(png_ptr, "Can't add Up filter after starting");
nuclear@26 1202 png_ptr->do_filter &= ~PNG_FILTER_UP;
nuclear@26 1203 }
nuclear@26 1204 else
nuclear@26 1205 {
nuclear@26 1206 png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
nuclear@26 1207 (png_ptr->rowbytes + 1));
nuclear@26 1208 png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
nuclear@26 1209 }
nuclear@26 1210 }
nuclear@26 1211
nuclear@26 1212 if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
nuclear@26 1213 {
nuclear@26 1214 if (png_ptr->prev_row == NULL)
nuclear@26 1215 {
nuclear@26 1216 png_warning(png_ptr, "Can't add Average filter after starting");
nuclear@26 1217 png_ptr->do_filter &= ~PNG_FILTER_AVG;
nuclear@26 1218 }
nuclear@26 1219 else
nuclear@26 1220 {
nuclear@26 1221 png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
nuclear@26 1222 (png_ptr->rowbytes + 1));
nuclear@26 1223 png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
nuclear@26 1224 }
nuclear@26 1225 }
nuclear@26 1226
nuclear@26 1227 if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
nuclear@26 1228 png_ptr->paeth_row == NULL)
nuclear@26 1229 {
nuclear@26 1230 if (png_ptr->prev_row == NULL)
nuclear@26 1231 {
nuclear@26 1232 png_warning(png_ptr, "Can't add Paeth filter after starting");
nuclear@26 1233 png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
nuclear@26 1234 }
nuclear@26 1235 else
nuclear@26 1236 {
nuclear@26 1237 png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
nuclear@26 1238 (png_ptr->rowbytes + 1));
nuclear@26 1239 png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
nuclear@26 1240 }
nuclear@26 1241 }
nuclear@26 1242
nuclear@26 1243 if (png_ptr->do_filter == PNG_NO_FILTERS)
nuclear@26 1244 #endif /* PNG_NO_WRITE_FILTER */
nuclear@26 1245 png_ptr->do_filter = PNG_FILTER_NONE;
nuclear@26 1246 }
nuclear@26 1247 }
nuclear@26 1248 else
nuclear@26 1249 png_error(png_ptr, "Unknown custom filter method");
nuclear@26 1250 }
nuclear@26 1251
nuclear@26 1252 /* This allows us to influence the way in which libpng chooses the "best"
nuclear@26 1253 * filter for the current scanline. While the "minimum-sum-of-absolute-
nuclear@26 1254 * differences metric is relatively fast and effective, there is some
nuclear@26 1255 * question as to whether it can be improved upon by trying to keep the
nuclear@26 1256 * filtered data going to zlib more consistent, hopefully resulting in
nuclear@26 1257 * better compression.
nuclear@26 1258 */
nuclear@26 1259 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */
nuclear@26 1260 void PNGAPI
nuclear@26 1261 png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
nuclear@26 1262 int num_weights, png_doublep filter_weights,
nuclear@26 1263 png_doublep filter_costs)
nuclear@26 1264 {
nuclear@26 1265 int i;
nuclear@26 1266
nuclear@26 1267 png_debug(1, "in png_set_filter_heuristics\n");
nuclear@26 1268 if (png_ptr == NULL)
nuclear@26 1269 return;
nuclear@26 1270 if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
nuclear@26 1271 {
nuclear@26 1272 png_warning(png_ptr, "Unknown filter heuristic method");
nuclear@26 1273 return;
nuclear@26 1274 }
nuclear@26 1275
nuclear@26 1276 if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
nuclear@26 1277 {
nuclear@26 1278 heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
nuclear@26 1279 }
nuclear@26 1280
nuclear@26 1281 if (num_weights < 0 || filter_weights == NULL ||
nuclear@26 1282 heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
nuclear@26 1283 {
nuclear@26 1284 num_weights = 0;
nuclear@26 1285 }
nuclear@26 1286
nuclear@26 1287 png_ptr->num_prev_filters = (png_byte)num_weights;
nuclear@26 1288 png_ptr->heuristic_method = (png_byte)heuristic_method;
nuclear@26 1289
nuclear@26 1290 if (num_weights > 0)
nuclear@26 1291 {
nuclear@26 1292 if (png_ptr->prev_filters == NULL)
nuclear@26 1293 {
nuclear@26 1294 png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
nuclear@26 1295 (png_uint_32)(png_sizeof(png_byte) * num_weights));
nuclear@26 1296
nuclear@26 1297 /* To make sure that the weighting starts out fairly */
nuclear@26 1298 for (i = 0; i < num_weights; i++)
nuclear@26 1299 {
nuclear@26 1300 png_ptr->prev_filters[i] = 255;
nuclear@26 1301 }
nuclear@26 1302 }
nuclear@26 1303
nuclear@26 1304 if (png_ptr->filter_weights == NULL)
nuclear@26 1305 {
nuclear@26 1306 png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
nuclear@26 1307 (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
nuclear@26 1308
nuclear@26 1309 png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
nuclear@26 1310 (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
nuclear@26 1311 for (i = 0; i < num_weights; i++)
nuclear@26 1312 {
nuclear@26 1313 png_ptr->inv_filter_weights[i] =
nuclear@26 1314 png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
nuclear@26 1315 }
nuclear@26 1316 }
nuclear@26 1317
nuclear@26 1318 for (i = 0; i < num_weights; i++)
nuclear@26 1319 {
nuclear@26 1320 if (filter_weights[i] < 0.0)
nuclear@26 1321 {
nuclear@26 1322 png_ptr->inv_filter_weights[i] =
nuclear@26 1323 png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
nuclear@26 1324 }
nuclear@26 1325 else
nuclear@26 1326 {
nuclear@26 1327 png_ptr->inv_filter_weights[i] =
nuclear@26 1328 (png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);
nuclear@26 1329 png_ptr->filter_weights[i] =
nuclear@26 1330 (png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
nuclear@26 1331 }
nuclear@26 1332 }
nuclear@26 1333 }
nuclear@26 1334
nuclear@26 1335 /* If, in the future, there are other filter methods, this would
nuclear@26 1336 * need to be based on png_ptr->filter.
nuclear@26 1337 */
nuclear@26 1338 if (png_ptr->filter_costs == NULL)
nuclear@26 1339 {
nuclear@26 1340 png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
nuclear@26 1341 (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
nuclear@26 1342
nuclear@26 1343 png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
nuclear@26 1344 (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
nuclear@26 1345
nuclear@26 1346 for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
nuclear@26 1347 {
nuclear@26 1348 png_ptr->inv_filter_costs[i] =
nuclear@26 1349 png_ptr->filter_costs[i] = PNG_COST_FACTOR;
nuclear@26 1350 }
nuclear@26 1351 }
nuclear@26 1352
nuclear@26 1353 /* Here is where we set the relative costs of the different filters. We
nuclear@26 1354 * should take the desired compression level into account when setting
nuclear@26 1355 * the costs, so that Paeth, for instance, has a high relative cost at low
nuclear@26 1356 * compression levels, while it has a lower relative cost at higher
nuclear@26 1357 * compression settings. The filter types are in order of increasing
nuclear@26 1358 * relative cost, so it would be possible to do this with an algorithm.
nuclear@26 1359 */
nuclear@26 1360 for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
nuclear@26 1361 {
nuclear@26 1362 if (filter_costs == NULL || filter_costs[i] < 0.0)
nuclear@26 1363 {
nuclear@26 1364 png_ptr->inv_filter_costs[i] =
nuclear@26 1365 png_ptr->filter_costs[i] = PNG_COST_FACTOR;
nuclear@26 1366 }
nuclear@26 1367 else if (filter_costs[i] >= 1.0)
nuclear@26 1368 {
nuclear@26 1369 png_ptr->inv_filter_costs[i] =
nuclear@26 1370 (png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);
nuclear@26 1371 png_ptr->filter_costs[i] =
nuclear@26 1372 (png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);
nuclear@26 1373 }
nuclear@26 1374 }
nuclear@26 1375 }
nuclear@26 1376 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
nuclear@26 1377
nuclear@26 1378 void PNGAPI
nuclear@26 1379 png_set_compression_level(png_structp png_ptr, int level)
nuclear@26 1380 {
nuclear@26 1381 png_debug(1, "in png_set_compression_level\n");
nuclear@26 1382 if (png_ptr == NULL)
nuclear@26 1383 return;
nuclear@26 1384 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
nuclear@26 1385 png_ptr->zlib_level = level;
nuclear@26 1386 }
nuclear@26 1387
nuclear@26 1388 void PNGAPI
nuclear@26 1389 png_set_compression_mem_level(png_structp png_ptr, int mem_level)
nuclear@26 1390 {
nuclear@26 1391 png_debug(1, "in png_set_compression_mem_level\n");
nuclear@26 1392 if (png_ptr == NULL)
nuclear@26 1393 return;
nuclear@26 1394 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
nuclear@26 1395 png_ptr->zlib_mem_level = mem_level;
nuclear@26 1396 }
nuclear@26 1397
nuclear@26 1398 void PNGAPI
nuclear@26 1399 png_set_compression_strategy(png_structp png_ptr, int strategy)
nuclear@26 1400 {
nuclear@26 1401 png_debug(1, "in png_set_compression_strategy\n");
nuclear@26 1402 if (png_ptr == NULL)
nuclear@26 1403 return;
nuclear@26 1404 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
nuclear@26 1405 png_ptr->zlib_strategy = strategy;
nuclear@26 1406 }
nuclear@26 1407
nuclear@26 1408 void PNGAPI
nuclear@26 1409 png_set_compression_window_bits(png_structp png_ptr, int window_bits)
nuclear@26 1410 {
nuclear@26 1411 if (png_ptr == NULL)
nuclear@26 1412 return;
nuclear@26 1413 if (window_bits > 15)
nuclear@26 1414 png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
nuclear@26 1415 else if (window_bits < 8)
nuclear@26 1416 png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
nuclear@26 1417 #ifndef WBITS_8_OK
nuclear@26 1418 /* avoid libpng bug with 256-byte windows */
nuclear@26 1419 if (window_bits == 8)
nuclear@26 1420 {
nuclear@26 1421 png_warning(png_ptr, "Compression window is being reset to 512");
nuclear@26 1422 window_bits=9;
nuclear@26 1423 }
nuclear@26 1424 #endif
nuclear@26 1425 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
nuclear@26 1426 png_ptr->zlib_window_bits = window_bits;
nuclear@26 1427 }
nuclear@26 1428
nuclear@26 1429 void PNGAPI
nuclear@26 1430 png_set_compression_method(png_structp png_ptr, int method)
nuclear@26 1431 {
nuclear@26 1432 png_debug(1, "in png_set_compression_method\n");
nuclear@26 1433 if (png_ptr == NULL)
nuclear@26 1434 return;
nuclear@26 1435 if (method != 8)
nuclear@26 1436 png_warning(png_ptr, "Only compression method 8 is supported by PNG");
nuclear@26 1437 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
nuclear@26 1438 png_ptr->zlib_method = method;
nuclear@26 1439 }
nuclear@26 1440
nuclear@26 1441 void PNGAPI
nuclear@26 1442 png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
nuclear@26 1443 {
nuclear@26 1444 if (png_ptr == NULL)
nuclear@26 1445 return;
nuclear@26 1446 png_ptr->write_row_fn = write_row_fn;
nuclear@26 1447 }
nuclear@26 1448
nuclear@26 1449 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
nuclear@26 1450 void PNGAPI
nuclear@26 1451 png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
nuclear@26 1452 write_user_transform_fn)
nuclear@26 1453 {
nuclear@26 1454 png_debug(1, "in png_set_write_user_transform_fn\n");
nuclear@26 1455 if (png_ptr == NULL)
nuclear@26 1456 return;
nuclear@26 1457 png_ptr->transformations |= PNG_USER_TRANSFORM;
nuclear@26 1458 png_ptr->write_user_transform_fn = write_user_transform_fn;
nuclear@26 1459 }
nuclear@26 1460 #endif
nuclear@26 1461
nuclear@26 1462
nuclear@26 1463 #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@26 1464 void PNGAPI
nuclear@26 1465 png_write_png(png_structp png_ptr, png_infop info_ptr,
nuclear@26 1466 int transforms, voidp params)
nuclear@26 1467 {
nuclear@26 1468 if (png_ptr == NULL || info_ptr == NULL)
nuclear@26 1469 return;
nuclear@26 1470 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
nuclear@26 1471 /* invert the alpha channel from opacity to transparency */
nuclear@26 1472 if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
nuclear@26 1473 png_set_invert_alpha(png_ptr);
nuclear@26 1474 #endif
nuclear@26 1475
nuclear@26 1476 /* Write the file header information. */
nuclear@26 1477 png_write_info(png_ptr, info_ptr);
nuclear@26 1478
nuclear@26 1479 /* ------ these transformations don't touch the info structure ------- */
nuclear@26 1480
nuclear@26 1481 #if defined(PNG_WRITE_INVERT_SUPPORTED)
nuclear@26 1482 /* invert monochrome pixels */
nuclear@26 1483 if (transforms & PNG_TRANSFORM_INVERT_MONO)
nuclear@26 1484 png_set_invert_mono(png_ptr);
nuclear@26 1485 #endif
nuclear@26 1486
nuclear@26 1487 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
nuclear@26 1488 /* Shift the pixels up to a legal bit depth and fill in
nuclear@26 1489 * as appropriate to correctly scale the image.
nuclear@26 1490 */
nuclear@26 1491 if ((transforms & PNG_TRANSFORM_SHIFT)
nuclear@26 1492 && (info_ptr->valid & PNG_INFO_sBIT))
nuclear@26 1493 png_set_shift(png_ptr, &info_ptr->sig_bit);
nuclear@26 1494 #endif
nuclear@26 1495
nuclear@26 1496 #if defined(PNG_WRITE_PACK_SUPPORTED)
nuclear@26 1497 /* pack pixels into bytes */
nuclear@26 1498 if (transforms & PNG_TRANSFORM_PACKING)
nuclear@26 1499 png_set_packing(png_ptr);
nuclear@26 1500 #endif
nuclear@26 1501
nuclear@26 1502 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
nuclear@26 1503 /* swap location of alpha bytes from ARGB to RGBA */
nuclear@26 1504 if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
nuclear@26 1505 png_set_swap_alpha(png_ptr);
nuclear@26 1506 #endif
nuclear@26 1507
nuclear@26 1508 #if defined(PNG_WRITE_FILLER_SUPPORTED)
nuclear@26 1509 /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
nuclear@26 1510 * RGB (4 channels -> 3 channels). The second parameter is not used.
nuclear@26 1511 */
nuclear@26 1512 if (transforms & PNG_TRANSFORM_STRIP_FILLER)
nuclear@26 1513 png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
nuclear@26 1514 #endif
nuclear@26 1515
nuclear@26 1516 #if defined(PNG_WRITE_BGR_SUPPORTED)
nuclear@26 1517 /* flip BGR pixels to RGB */
nuclear@26 1518 if (transforms & PNG_TRANSFORM_BGR)
nuclear@26 1519 png_set_bgr(png_ptr);
nuclear@26 1520 #endif
nuclear@26 1521
nuclear@26 1522 #if defined(PNG_WRITE_SWAP_SUPPORTED)
nuclear@26 1523 /* swap bytes of 16-bit files to most significant byte first */
nuclear@26 1524 if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
nuclear@26 1525 png_set_swap(png_ptr);
nuclear@26 1526 #endif
nuclear@26 1527
nuclear@26 1528 #if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
nuclear@26 1529 /* swap bits of 1, 2, 4 bit packed pixel formats */
nuclear@26 1530 if (transforms & PNG_TRANSFORM_PACKSWAP)
nuclear@26 1531 png_set_packswap(png_ptr);
nuclear@26 1532 #endif
nuclear@26 1533
nuclear@26 1534 /* ----------------------- end of transformations ------------------- */
nuclear@26 1535
nuclear@26 1536 /* write the bits */
nuclear@26 1537 if (info_ptr->valid & PNG_INFO_IDAT)
nuclear@26 1538 png_write_image(png_ptr, info_ptr->row_pointers);
nuclear@26 1539
nuclear@26 1540 /* It is REQUIRED to call this to finish writing the rest of the file */
nuclear@26 1541 png_write_end(png_ptr, info_ptr);
nuclear@26 1542
nuclear@26 1543 transforms = transforms; /* quiet compiler warnings */
nuclear@26 1544 params = params;
nuclear@26 1545 }
nuclear@26 1546 #endif
nuclear@26 1547 #endif /* PNG_WRITE_SUPPORTED */