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annotate libs/libpng/pngwrite.c @ 2:334d17aed7de

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author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 02 Feb 2014 18:36:38 +0200
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rev   line source
nuclear@0 1
nuclear@0 2 /* pngwrite.c - general routines to write a PNG file
nuclear@0 3 *
nuclear@0 4 * Last changed in libpng 1.2.31 [August 19, 2008]
nuclear@0 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@0 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@0 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@0 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@0 9 */
nuclear@0 10
nuclear@0 11 /* get internal access to png.h */
nuclear@0 12 #define PNG_INTERNAL
nuclear@0 13 #include "png.h"
nuclear@0 14 #ifdef PNG_WRITE_SUPPORTED
nuclear@0 15
nuclear@0 16 /* Writes all the PNG information. This is the suggested way to use the
nuclear@0 17 * library. If you have a new chunk to add, make a function to write it,
nuclear@0 18 * and put it in the correct location here. If you want the chunk written
nuclear@0 19 * after the image data, put it in png_write_end(). I strongly encourage
nuclear@0 20 * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
nuclear@0 21 * the chunk, as that will keep the code from breaking if you want to just
nuclear@0 22 * write a plain PNG file. If you have long comments, I suggest writing
nuclear@0 23 * them in png_write_end(), and compressing them.
nuclear@0 24 */
nuclear@0 25 void PNGAPI
nuclear@0 26 png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
nuclear@0 27 {
nuclear@0 28 png_debug(1, "in png_write_info_before_PLTE\n");
nuclear@0 29 if (png_ptr == NULL || info_ptr == NULL)
nuclear@0 30 return;
nuclear@0 31 if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
nuclear@0 32 {
nuclear@0 33 png_write_sig(png_ptr); /* write PNG signature */
nuclear@0 34 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@0 35 if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
nuclear@0 36 {
nuclear@0 37 png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
nuclear@0 38 png_ptr->mng_features_permitted=0;
nuclear@0 39 }
nuclear@0 40 #endif
nuclear@0 41 /* write IHDR information. */
nuclear@0 42 png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
nuclear@0 43 info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
nuclear@0 44 info_ptr->filter_type,
nuclear@0 45 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@0 46 info_ptr->interlace_type);
nuclear@0 47 #else
nuclear@0 48 0);
nuclear@0 49 #endif
nuclear@0 50 /* the rest of these check to see if the valid field has the appropriate
nuclear@0 51 flag set, and if it does, writes the chunk. */
nuclear@0 52 #if defined(PNG_WRITE_gAMA_SUPPORTED)
nuclear@0 53 if (info_ptr->valid & PNG_INFO_gAMA)
nuclear@0 54 {
nuclear@0 55 # ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@0 56 png_write_gAMA(png_ptr, info_ptr->gamma);
nuclear@0 57 #else
nuclear@0 58 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@0 59 png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
nuclear@0 60 # endif
nuclear@0 61 #endif
nuclear@0 62 }
nuclear@0 63 #endif
nuclear@0 64 #if defined(PNG_WRITE_sRGB_SUPPORTED)
nuclear@0 65 if (info_ptr->valid & PNG_INFO_sRGB)
nuclear@0 66 png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
nuclear@0 67 #endif
nuclear@0 68 #if defined(PNG_WRITE_iCCP_SUPPORTED)
nuclear@0 69 if (info_ptr->valid & PNG_INFO_iCCP)
nuclear@0 70 png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
nuclear@0 71 info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
nuclear@0 72 #endif
nuclear@0 73 #if defined(PNG_WRITE_sBIT_SUPPORTED)
nuclear@0 74 if (info_ptr->valid & PNG_INFO_sBIT)
nuclear@0 75 png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
nuclear@0 76 #endif
nuclear@0 77 #if defined(PNG_WRITE_cHRM_SUPPORTED)
nuclear@0 78 if (info_ptr->valid & PNG_INFO_cHRM)
nuclear@0 79 {
nuclear@0 80 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@0 81 png_write_cHRM(png_ptr,
nuclear@0 82 info_ptr->x_white, info_ptr->y_white,
nuclear@0 83 info_ptr->x_red, info_ptr->y_red,
nuclear@0 84 info_ptr->x_green, info_ptr->y_green,
nuclear@0 85 info_ptr->x_blue, info_ptr->y_blue);
nuclear@0 86 #else
nuclear@0 87 # ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@0 88 png_write_cHRM_fixed(png_ptr,
nuclear@0 89 info_ptr->int_x_white, info_ptr->int_y_white,
nuclear@0 90 info_ptr->int_x_red, info_ptr->int_y_red,
nuclear@0 91 info_ptr->int_x_green, info_ptr->int_y_green,
nuclear@0 92 info_ptr->int_x_blue, info_ptr->int_y_blue);
nuclear@0 93 # endif
nuclear@0 94 #endif
nuclear@0 95 }
nuclear@0 96 #endif
nuclear@0 97 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@0 98 if (info_ptr->unknown_chunks_num)
nuclear@0 99 {
nuclear@0 100 png_unknown_chunk *up;
nuclear@0 101
nuclear@0 102 png_debug(5, "writing extra chunks\n");
nuclear@0 103
nuclear@0 104 for (up = info_ptr->unknown_chunks;
nuclear@0 105 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
nuclear@0 106 up++)
nuclear@0 107 {
nuclear@0 108 int keep=png_handle_as_unknown(png_ptr, up->name);
nuclear@0 109 if (keep != PNG_HANDLE_CHUNK_NEVER &&
nuclear@0 110 up->location && !(up->location & PNG_HAVE_PLTE) &&
nuclear@0 111 !(up->location & PNG_HAVE_IDAT) &&
nuclear@0 112 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
nuclear@0 113 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
nuclear@0 114 {
nuclear@0 115 if (up->size == 0)
nuclear@0 116 png_warning(png_ptr, "Writing zero-length unknown chunk");
nuclear@0 117 png_write_chunk(png_ptr, up->name, up->data, up->size);
nuclear@0 118 }
nuclear@0 119 }
nuclear@0 120 }
nuclear@0 121 #endif
nuclear@0 122 png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
nuclear@0 123 }
nuclear@0 124 }
nuclear@0 125
nuclear@0 126 void PNGAPI
nuclear@0 127 png_write_info(png_structp png_ptr, png_infop info_ptr)
nuclear@0 128 {
nuclear@0 129 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
nuclear@0 130 int i;
nuclear@0 131 #endif
nuclear@0 132
nuclear@0 133 png_debug(1, "in png_write_info\n");
nuclear@0 134
nuclear@0 135 if (png_ptr == NULL || info_ptr == NULL)
nuclear@0 136 return;
nuclear@0 137
nuclear@0 138 png_write_info_before_PLTE(png_ptr, info_ptr);
nuclear@0 139
nuclear@0 140 if (info_ptr->valid & PNG_INFO_PLTE)
nuclear@0 141 png_write_PLTE(png_ptr, info_ptr->palette,
nuclear@0 142 (png_uint_32)info_ptr->num_palette);
nuclear@0 143 else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@0 144 png_error(png_ptr, "Valid palette required for paletted images");
nuclear@0 145
nuclear@0 146 #if defined(PNG_WRITE_tRNS_SUPPORTED)
nuclear@0 147 if (info_ptr->valid & PNG_INFO_tRNS)
nuclear@0 148 {
nuclear@0 149 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
nuclear@0 150 /* invert the alpha channel (in tRNS) */
nuclear@0 151 if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
nuclear@0 152 info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@0 153 {
nuclear@0 154 int j;
nuclear@0 155 for (j=0; j<(int)info_ptr->num_trans; j++)
nuclear@0 156 info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
nuclear@0 157 }
nuclear@0 158 #endif
nuclear@0 159 png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
nuclear@0 160 info_ptr->num_trans, info_ptr->color_type);
nuclear@0 161 }
nuclear@0 162 #endif
nuclear@0 163 #if defined(PNG_WRITE_bKGD_SUPPORTED)
nuclear@0 164 if (info_ptr->valid & PNG_INFO_bKGD)
nuclear@0 165 png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
nuclear@0 166 #endif
nuclear@0 167 #if defined(PNG_WRITE_hIST_SUPPORTED)
nuclear@0 168 if (info_ptr->valid & PNG_INFO_hIST)
nuclear@0 169 png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
nuclear@0 170 #endif
nuclear@0 171 #if defined(PNG_WRITE_oFFs_SUPPORTED)
nuclear@0 172 if (info_ptr->valid & PNG_INFO_oFFs)
nuclear@0 173 png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
nuclear@0 174 info_ptr->offset_unit_type);
nuclear@0 175 #endif
nuclear@0 176 #if defined(PNG_WRITE_pCAL_SUPPORTED)
nuclear@0 177 if (info_ptr->valid & PNG_INFO_pCAL)
nuclear@0 178 png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
nuclear@0 179 info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
nuclear@0 180 info_ptr->pcal_units, info_ptr->pcal_params);
nuclear@0 181 #endif
nuclear@0 182 #if defined(PNG_WRITE_sCAL_SUPPORTED)
nuclear@0 183 if (info_ptr->valid & PNG_INFO_sCAL)
nuclear@0 184 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
nuclear@0 185 png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
nuclear@0 186 info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
nuclear@0 187 #else
nuclear@0 188 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@0 189 png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
nuclear@0 190 info_ptr->scal_s_width, info_ptr->scal_s_height);
nuclear@0 191 #else
nuclear@0 192 png_warning(png_ptr,
nuclear@0 193 "png_write_sCAL not supported; sCAL chunk not written.");
nuclear@0 194 #endif
nuclear@0 195 #endif
nuclear@0 196 #endif
nuclear@0 197 #if defined(PNG_WRITE_pHYs_SUPPORTED)
nuclear@0 198 if (info_ptr->valid & PNG_INFO_pHYs)
nuclear@0 199 png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
nuclear@0 200 info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
nuclear@0 201 #endif
nuclear@0 202 #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@0 203 if (info_ptr->valid & PNG_INFO_tIME)
nuclear@0 204 {
nuclear@0 205 png_write_tIME(png_ptr, &(info_ptr->mod_time));
nuclear@0 206 png_ptr->mode |= PNG_WROTE_tIME;
nuclear@0 207 }
nuclear@0 208 #endif
nuclear@0 209 #if defined(PNG_WRITE_sPLT_SUPPORTED)
nuclear@0 210 if (info_ptr->valid & PNG_INFO_sPLT)
nuclear@0 211 for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
nuclear@0 212 png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
nuclear@0 213 #endif
nuclear@0 214 #if defined(PNG_WRITE_TEXT_SUPPORTED)
nuclear@0 215 /* Check to see if we need to write text chunks */
nuclear@0 216 for (i = 0; i < info_ptr->num_text; i++)
nuclear@0 217 {
nuclear@0 218 png_debug2(2, "Writing header text chunk %d, type %d\n", i,
nuclear@0 219 info_ptr->text[i].compression);
nuclear@0 220 /* an internationalized chunk? */
nuclear@0 221 if (info_ptr->text[i].compression > 0)
nuclear@0 222 {
nuclear@0 223 #if defined(PNG_WRITE_iTXt_SUPPORTED)
nuclear@0 224 /* write international chunk */
nuclear@0 225 png_write_iTXt(png_ptr,
nuclear@0 226 info_ptr->text[i].compression,
nuclear@0 227 info_ptr->text[i].key,
nuclear@0 228 info_ptr->text[i].lang,
nuclear@0 229 info_ptr->text[i].lang_key,
nuclear@0 230 info_ptr->text[i].text);
nuclear@0 231 #else
nuclear@0 232 png_warning(png_ptr, "Unable to write international text");
nuclear@0 233 #endif
nuclear@0 234 /* Mark this chunk as written */
nuclear@0 235 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@0 236 }
nuclear@0 237 /* If we want a compressed text chunk */
nuclear@0 238 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
nuclear@0 239 {
nuclear@0 240 #if defined(PNG_WRITE_zTXt_SUPPORTED)
nuclear@0 241 /* write compressed chunk */
nuclear@0 242 png_write_zTXt(png_ptr, info_ptr->text[i].key,
nuclear@0 243 info_ptr->text[i].text, 0,
nuclear@0 244 info_ptr->text[i].compression);
nuclear@0 245 #else
nuclear@0 246 png_warning(png_ptr, "Unable to write compressed text");
nuclear@0 247 #endif
nuclear@0 248 /* Mark this chunk as written */
nuclear@0 249 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
nuclear@0 250 }
nuclear@0 251 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
nuclear@0 252 {
nuclear@0 253 #if defined(PNG_WRITE_tEXt_SUPPORTED)
nuclear@0 254 /* write uncompressed chunk */
nuclear@0 255 png_write_tEXt(png_ptr, info_ptr->text[i].key,
nuclear@0 256 info_ptr->text[i].text,
nuclear@0 257 0);
nuclear@0 258 #else
nuclear@0 259 png_warning(png_ptr, "Unable to write uncompressed text");
nuclear@0 260 #endif
nuclear@0 261 /* Mark this chunk as written */
nuclear@0 262 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@0 263 }
nuclear@0 264 }
nuclear@0 265 #endif
nuclear@0 266 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@0 267 if (info_ptr->unknown_chunks_num)
nuclear@0 268 {
nuclear@0 269 png_unknown_chunk *up;
nuclear@0 270
nuclear@0 271 png_debug(5, "writing extra chunks\n");
nuclear@0 272
nuclear@0 273 for (up = info_ptr->unknown_chunks;
nuclear@0 274 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
nuclear@0 275 up++)
nuclear@0 276 {
nuclear@0 277 int keep=png_handle_as_unknown(png_ptr, up->name);
nuclear@0 278 if (keep != PNG_HANDLE_CHUNK_NEVER &&
nuclear@0 279 up->location && (up->location & PNG_HAVE_PLTE) &&
nuclear@0 280 !(up->location & PNG_HAVE_IDAT) &&
nuclear@0 281 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
nuclear@0 282 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
nuclear@0 283 {
nuclear@0 284 png_write_chunk(png_ptr, up->name, up->data, up->size);
nuclear@0 285 }
nuclear@0 286 }
nuclear@0 287 }
nuclear@0 288 #endif
nuclear@0 289 }
nuclear@0 290
nuclear@0 291 /* Writes the end of the PNG file. If you don't want to write comments or
nuclear@0 292 * time information, you can pass NULL for info. If you already wrote these
nuclear@0 293 * in png_write_info(), do not write them again here. If you have long
nuclear@0 294 * comments, I suggest writing them here, and compressing them.
nuclear@0 295 */
nuclear@0 296 void PNGAPI
nuclear@0 297 png_write_end(png_structp png_ptr, png_infop info_ptr)
nuclear@0 298 {
nuclear@0 299 png_debug(1, "in png_write_end\n");
nuclear@0 300 if (png_ptr == NULL)
nuclear@0 301 return;
nuclear@0 302 if (!(png_ptr->mode & PNG_HAVE_IDAT))
nuclear@0 303 png_error(png_ptr, "No IDATs written into file");
nuclear@0 304
nuclear@0 305 /* see if user wants us to write information chunks */
nuclear@0 306 if (info_ptr != NULL)
nuclear@0 307 {
nuclear@0 308 #if defined(PNG_WRITE_TEXT_SUPPORTED)
nuclear@0 309 int i; /* local index variable */
nuclear@0 310 #endif
nuclear@0 311 #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@0 312 /* check to see if user has supplied a time chunk */
nuclear@0 313 if ((info_ptr->valid & PNG_INFO_tIME) &&
nuclear@0 314 !(png_ptr->mode & PNG_WROTE_tIME))
nuclear@0 315 png_write_tIME(png_ptr, &(info_ptr->mod_time));
nuclear@0 316 #endif
nuclear@0 317 #if defined(PNG_WRITE_TEXT_SUPPORTED)
nuclear@0 318 /* loop through comment chunks */
nuclear@0 319 for (i = 0; i < info_ptr->num_text; i++)
nuclear@0 320 {
nuclear@0 321 png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,
nuclear@0 322 info_ptr->text[i].compression);
nuclear@0 323 /* an internationalized chunk? */
nuclear@0 324 if (info_ptr->text[i].compression > 0)
nuclear@0 325 {
nuclear@0 326 #if defined(PNG_WRITE_iTXt_SUPPORTED)
nuclear@0 327 /* write international chunk */
nuclear@0 328 png_write_iTXt(png_ptr,
nuclear@0 329 info_ptr->text[i].compression,
nuclear@0 330 info_ptr->text[i].key,
nuclear@0 331 info_ptr->text[i].lang,
nuclear@0 332 info_ptr->text[i].lang_key,
nuclear@0 333 info_ptr->text[i].text);
nuclear@0 334 #else
nuclear@0 335 png_warning(png_ptr, "Unable to write international text");
nuclear@0 336 #endif
nuclear@0 337 /* Mark this chunk as written */
nuclear@0 338 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@0 339 }
nuclear@0 340 else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
nuclear@0 341 {
nuclear@0 342 #if defined(PNG_WRITE_zTXt_SUPPORTED)
nuclear@0 343 /* write compressed chunk */
nuclear@0 344 png_write_zTXt(png_ptr, info_ptr->text[i].key,
nuclear@0 345 info_ptr->text[i].text, 0,
nuclear@0 346 info_ptr->text[i].compression);
nuclear@0 347 #else
nuclear@0 348 png_warning(png_ptr, "Unable to write compressed text");
nuclear@0 349 #endif
nuclear@0 350 /* Mark this chunk as written */
nuclear@0 351 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
nuclear@0 352 }
nuclear@0 353 else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
nuclear@0 354 {
nuclear@0 355 #if defined(PNG_WRITE_tEXt_SUPPORTED)
nuclear@0 356 /* write uncompressed chunk */
nuclear@0 357 png_write_tEXt(png_ptr, info_ptr->text[i].key,
nuclear@0 358 info_ptr->text[i].text, 0);
nuclear@0 359 #else
nuclear@0 360 png_warning(png_ptr, "Unable to write uncompressed text");
nuclear@0 361 #endif
nuclear@0 362
nuclear@0 363 /* Mark this chunk as written */
nuclear@0 364 info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@0 365 }
nuclear@0 366 }
nuclear@0 367 #endif
nuclear@0 368 #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@0 369 if (info_ptr->unknown_chunks_num)
nuclear@0 370 {
nuclear@0 371 png_unknown_chunk *up;
nuclear@0 372
nuclear@0 373 png_debug(5, "writing extra chunks\n");
nuclear@0 374
nuclear@0 375 for (up = info_ptr->unknown_chunks;
nuclear@0 376 up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
nuclear@0 377 up++)
nuclear@0 378 {
nuclear@0 379 int keep=png_handle_as_unknown(png_ptr, up->name);
nuclear@0 380 if (keep != PNG_HANDLE_CHUNK_NEVER &&
nuclear@0 381 up->location && (up->location & PNG_AFTER_IDAT) &&
nuclear@0 382 ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
nuclear@0 383 (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
nuclear@0 384 {
nuclear@0 385 png_write_chunk(png_ptr, up->name, up->data, up->size);
nuclear@0 386 }
nuclear@0 387 }
nuclear@0 388 }
nuclear@0 389 #endif
nuclear@0 390 }
nuclear@0 391
nuclear@0 392 png_ptr->mode |= PNG_AFTER_IDAT;
nuclear@0 393
nuclear@0 394 /* write end of PNG file */
nuclear@0 395 png_write_IEND(png_ptr);
nuclear@0 396 /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
nuclear@0 397 * and restored again in libpng-1.2.30, may cause some applications that
nuclear@0 398 * do not set png_ptr->output_flush_fn to crash. If your application
nuclear@0 399 * experiences a problem, please try building libpng with
nuclear@0 400 * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
nuclear@0 401 * png-mng-implement at lists.sf.net . This kludge will be removed
nuclear@0 402 * from libpng-1.4.0.
nuclear@0 403 */
nuclear@0 404 #if defined(PNG_WRITE_FLUSH_SUPPORTED) && \
nuclear@0 405 defined(PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED)
nuclear@0 406 png_flush(png_ptr);
nuclear@0 407 #endif
nuclear@0 408 }
nuclear@0 409
nuclear@0 410 #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@0 411 #if !defined(_WIN32_WCE)
nuclear@0 412 /* "time.h" functions are not supported on WindowsCE */
nuclear@0 413 void PNGAPI
nuclear@0 414 png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
nuclear@0 415 {
nuclear@0 416 png_debug(1, "in png_convert_from_struct_tm\n");
nuclear@0 417 ptime->year = (png_uint_16)(1900 + ttime->tm_year);
nuclear@0 418 ptime->month = (png_byte)(ttime->tm_mon + 1);
nuclear@0 419 ptime->day = (png_byte)ttime->tm_mday;
nuclear@0 420 ptime->hour = (png_byte)ttime->tm_hour;
nuclear@0 421 ptime->minute = (png_byte)ttime->tm_min;
nuclear@0 422 ptime->second = (png_byte)ttime->tm_sec;
nuclear@0 423 }
nuclear@0 424
nuclear@0 425 void PNGAPI
nuclear@0 426 png_convert_from_time_t(png_timep ptime, time_t ttime)
nuclear@0 427 {
nuclear@0 428 struct tm *tbuf;
nuclear@0 429
nuclear@0 430 png_debug(1, "in png_convert_from_time_t\n");
nuclear@0 431 tbuf = gmtime(&ttime);
nuclear@0 432 png_convert_from_struct_tm(ptime, tbuf);
nuclear@0 433 }
nuclear@0 434 #endif
nuclear@0 435 #endif
nuclear@0 436
nuclear@0 437 /* Initialize png_ptr structure, and allocate any memory needed */
nuclear@0 438 png_structp PNGAPI
nuclear@0 439 png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@0 440 png_error_ptr error_fn, png_error_ptr warn_fn)
nuclear@0 441 {
nuclear@0 442 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 443 return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
nuclear@0 444 warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
nuclear@0 445 }
nuclear@0 446
nuclear@0 447 /* Alternate initialize png_ptr structure, and allocate any memory needed */
nuclear@0 448 png_structp PNGAPI
nuclear@0 449 png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@0 450 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
nuclear@0 451 png_malloc_ptr malloc_fn, png_free_ptr free_fn)
nuclear@0 452 {
nuclear@0 453 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 454 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 455 volatile
nuclear@0 456 #endif
nuclear@0 457 png_structp png_ptr;
nuclear@0 458 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 459 #ifdef USE_FAR_KEYWORD
nuclear@0 460 jmp_buf jmpbuf;
nuclear@0 461 #endif
nuclear@0 462 #endif
nuclear@0 463 int i;
nuclear@0 464 png_debug(1, "in png_create_write_struct\n");
nuclear@0 465 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 466 png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
nuclear@0 467 (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
nuclear@0 468 #else
nuclear@0 469 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@0 470 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 471 if (png_ptr == NULL)
nuclear@0 472 return (NULL);
nuclear@0 473
nuclear@0 474 /* added at libpng-1.2.6 */
nuclear@0 475 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@0 476 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@0 477 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@0 478 #endif
nuclear@0 479
nuclear@0 480 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 481 #ifdef USE_FAR_KEYWORD
nuclear@0 482 if (setjmp(jmpbuf))
nuclear@0 483 #else
nuclear@0 484 if (setjmp(png_ptr->jmpbuf))
nuclear@0 485 #endif
nuclear@0 486 {
nuclear@0 487 png_free(png_ptr, png_ptr->zbuf);
nuclear@0 488 png_ptr->zbuf=NULL;
nuclear@0 489 png_destroy_struct(png_ptr);
nuclear@0 490 return (NULL);
nuclear@0 491 }
nuclear@0 492 #ifdef USE_FAR_KEYWORD
nuclear@0 493 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@0 494 #endif
nuclear@0 495 #endif
nuclear@0 496
nuclear@0 497 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 498 png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
nuclear@0 499 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@0 500 png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
nuclear@0 501
nuclear@0 502 if (user_png_ver)
nuclear@0 503 {
nuclear@0 504 i=0;
nuclear@0 505 do
nuclear@0 506 {
nuclear@0 507 if (user_png_ver[i] != png_libpng_ver[i])
nuclear@0 508 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@0 509 } while (png_libpng_ver[i++]);
nuclear@0 510 }
nuclear@0 511
nuclear@0 512 if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
nuclear@0 513 {
nuclear@0 514 /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
nuclear@0 515 * we must recompile any applications that use any older library version.
nuclear@0 516 * For versions after libpng 1.0, we will be compatible, so we need
nuclear@0 517 * only check the first digit.
nuclear@0 518 */
nuclear@0 519 if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
nuclear@0 520 (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
nuclear@0 521 (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
nuclear@0 522 {
nuclear@0 523 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@0 524 char msg[80];
nuclear@0 525 if (user_png_ver)
nuclear@0 526 {
nuclear@0 527 png_snprintf(msg, 80,
nuclear@0 528 "Application was compiled with png.h from libpng-%.20s",
nuclear@0 529 user_png_ver);
nuclear@0 530 png_warning(png_ptr, msg);
nuclear@0 531 }
nuclear@0 532 png_snprintf(msg, 80,
nuclear@0 533 "Application is running with png.c from libpng-%.20s",
nuclear@0 534 png_libpng_ver);
nuclear@0 535 png_warning(png_ptr, msg);
nuclear@0 536 #endif
nuclear@0 537 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@0 538 png_ptr->flags=0;
nuclear@0 539 #endif
nuclear@0 540 png_error(png_ptr,
nuclear@0 541 "Incompatible libpng version in application and library");
nuclear@0 542 }
nuclear@0 543 }
nuclear@0 544
nuclear@0 545 /* initialize zbuf - compression buffer */
nuclear@0 546 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@0 547 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@0 548 (png_uint_32)png_ptr->zbuf_size);
nuclear@0 549
nuclear@0 550 png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
nuclear@0 551 png_flush_ptr_NULL);
nuclear@0 552
nuclear@0 553 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@0 554 png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
nuclear@0 555 1, png_doublep_NULL, png_doublep_NULL);
nuclear@0 556 #endif
nuclear@0 557
nuclear@0 558 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 559 /* Applications that neglect to set up their own setjmp() and then encounter
nuclear@0 560 a png_error() will longjmp here. Since the jmpbuf is then meaningless we
nuclear@0 561 abort instead of returning. */
nuclear@0 562 #ifdef USE_FAR_KEYWORD
nuclear@0 563 if (setjmp(jmpbuf))
nuclear@0 564 PNG_ABORT();
nuclear@0 565 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@0 566 #else
nuclear@0 567 if (setjmp(png_ptr->jmpbuf))
nuclear@0 568 PNG_ABORT();
nuclear@0 569 #endif
nuclear@0 570 #endif
nuclear@0 571 return (png_ptr);
nuclear@0 572 }
nuclear@0 573
nuclear@0 574 /* Initialize png_ptr structure, and allocate any memory needed */
nuclear@0 575 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
nuclear@0 576 /* Deprecated. */
nuclear@0 577 #undef png_write_init
nuclear@0 578 void PNGAPI
nuclear@0 579 png_write_init(png_structp png_ptr)
nuclear@0 580 {
nuclear@0 581 /* We only come here via pre-1.0.7-compiled applications */
nuclear@0 582 png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
nuclear@0 583 }
nuclear@0 584
nuclear@0 585 void PNGAPI
nuclear@0 586 png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
nuclear@0 587 png_size_t png_struct_size, png_size_t png_info_size)
nuclear@0 588 {
nuclear@0 589 /* We only come here via pre-1.0.12-compiled applications */
nuclear@0 590 if (png_ptr == NULL) return;
nuclear@0 591 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@0 592 if (png_sizeof(png_struct) > png_struct_size ||
nuclear@0 593 png_sizeof(png_info) > png_info_size)
nuclear@0 594 {
nuclear@0 595 char msg[80];
nuclear@0 596 png_ptr->warning_fn=NULL;
nuclear@0 597 if (user_png_ver)
nuclear@0 598 {
nuclear@0 599 png_snprintf(msg, 80,
nuclear@0 600 "Application was compiled with png.h from libpng-%.20s",
nuclear@0 601 user_png_ver);
nuclear@0 602 png_warning(png_ptr, msg);
nuclear@0 603 }
nuclear@0 604 png_snprintf(msg, 80,
nuclear@0 605 "Application is running with png.c from libpng-%.20s",
nuclear@0 606 png_libpng_ver);
nuclear@0 607 png_warning(png_ptr, msg);
nuclear@0 608 }
nuclear@0 609 #endif
nuclear@0 610 if (png_sizeof(png_struct) > png_struct_size)
nuclear@0 611 {
nuclear@0 612 png_ptr->error_fn=NULL;
nuclear@0 613 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@0 614 png_ptr->flags=0;
nuclear@0 615 #endif
nuclear@0 616 png_error(png_ptr,
nuclear@0 617 "The png struct allocated by the application for writing is too small.");
nuclear@0 618 }
nuclear@0 619 if (png_sizeof(png_info) > png_info_size)
nuclear@0 620 {
nuclear@0 621 png_ptr->error_fn=NULL;
nuclear@0 622 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@0 623 png_ptr->flags=0;
nuclear@0 624 #endif
nuclear@0 625 png_error(png_ptr,
nuclear@0 626 "The info struct allocated by the application for writing is too small.");
nuclear@0 627 }
nuclear@0 628 png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
nuclear@0 629 }
nuclear@0 630 #endif /* PNG_1_0_X || PNG_1_2_X */
nuclear@0 631
nuclear@0 632
nuclear@0 633 void PNGAPI
nuclear@0 634 png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
nuclear@0 635 png_size_t png_struct_size)
nuclear@0 636 {
nuclear@0 637 png_structp png_ptr=*ptr_ptr;
nuclear@0 638 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 639 jmp_buf tmp_jmp; /* to save current jump buffer */
nuclear@0 640 #endif
nuclear@0 641
nuclear@0 642 int i = 0;
nuclear@0 643
nuclear@0 644 if (png_ptr == NULL)
nuclear@0 645 return;
nuclear@0 646
nuclear@0 647 do
nuclear@0 648 {
nuclear@0 649 if (user_png_ver[i] != png_libpng_ver[i])
nuclear@0 650 {
nuclear@0 651 #ifdef PNG_LEGACY_SUPPORTED
nuclear@0 652 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@0 653 #else
nuclear@0 654 png_ptr->warning_fn=NULL;
nuclear@0 655 png_warning(png_ptr,
nuclear@0 656 "Application uses deprecated png_write_init() and should be recompiled.");
nuclear@0 657 break;
nuclear@0 658 #endif
nuclear@0 659 }
nuclear@0 660 } while (png_libpng_ver[i++]);
nuclear@0 661
nuclear@0 662 png_debug(1, "in png_write_init_3\n");
nuclear@0 663
nuclear@0 664 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 665 /* save jump buffer and error functions */
nuclear@0 666 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@0 667 #endif
nuclear@0 668
nuclear@0 669 if (png_sizeof(png_struct) > png_struct_size)
nuclear@0 670 {
nuclear@0 671 png_destroy_struct(png_ptr);
nuclear@0 672 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@0 673 *ptr_ptr = png_ptr;
nuclear@0 674 }
nuclear@0 675
nuclear@0 676 /* reset all variables to 0 */
nuclear@0 677 png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@0 678
nuclear@0 679 /* added at libpng-1.2.6 */
nuclear@0 680 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@0 681 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@0 682 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@0 683 #endif
nuclear@0 684
nuclear@0 685 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 686 /* restore jump buffer */
nuclear@0 687 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@0 688 #endif
nuclear@0 689
nuclear@0 690 png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
nuclear@0 691 png_flush_ptr_NULL);
nuclear@0 692
nuclear@0 693 /* initialize zbuf - compression buffer */
nuclear@0 694 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@0 695 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@0 696 (png_uint_32)png_ptr->zbuf_size);
nuclear@0 697
nuclear@0 698 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@0 699 png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
nuclear@0 700 1, png_doublep_NULL, png_doublep_NULL);
nuclear@0 701 #endif
nuclear@0 702 }
nuclear@0 703
nuclear@0 704 /* Write a few rows of image data. If the image is interlaced,
nuclear@0 705 * either you will have to write the 7 sub images, or, if you
nuclear@0 706 * have called png_set_interlace_handling(), you will have to
nuclear@0 707 * "write" the image seven times.
nuclear@0 708 */
nuclear@0 709 void PNGAPI
nuclear@0 710 png_write_rows(png_structp png_ptr, png_bytepp row,
nuclear@0 711 png_uint_32 num_rows)
nuclear@0 712 {
nuclear@0 713 png_uint_32 i; /* row counter */
nuclear@0 714 png_bytepp rp; /* row pointer */
nuclear@0 715
nuclear@0 716 png_debug(1, "in png_write_rows\n");
nuclear@0 717
nuclear@0 718 if (png_ptr == NULL)
nuclear@0 719 return;
nuclear@0 720
nuclear@0 721 /* loop through the rows */
nuclear@0 722 for (i = 0, rp = row; i < num_rows; i++, rp++)
nuclear@0 723 {
nuclear@0 724 png_write_row(png_ptr, *rp);
nuclear@0 725 }
nuclear@0 726 }
nuclear@0 727
nuclear@0 728 /* Write the image. You only need to call this function once, even
nuclear@0 729 * if you are writing an interlaced image.
nuclear@0 730 */
nuclear@0 731 void PNGAPI
nuclear@0 732 png_write_image(png_structp png_ptr, png_bytepp image)
nuclear@0 733 {
nuclear@0 734 png_uint_32 i; /* row index */
nuclear@0 735 int pass, num_pass; /* pass variables */
nuclear@0 736 png_bytepp rp; /* points to current row */
nuclear@0 737
nuclear@0 738 if (png_ptr == NULL)
nuclear@0 739 return;
nuclear@0 740
nuclear@0 741 png_debug(1, "in png_write_image\n");
nuclear@0 742 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@0 743 /* intialize interlace handling. If image is not interlaced,
nuclear@0 744 this will set pass to 1 */
nuclear@0 745 num_pass = png_set_interlace_handling(png_ptr);
nuclear@0 746 #else
nuclear@0 747 num_pass = 1;
nuclear@0 748 #endif
nuclear@0 749 /* loop through passes */
nuclear@0 750 for (pass = 0; pass < num_pass; pass++)
nuclear@0 751 {
nuclear@0 752 /* loop through image */
nuclear@0 753 for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
nuclear@0 754 {
nuclear@0 755 png_write_row(png_ptr, *rp);
nuclear@0 756 }
nuclear@0 757 }
nuclear@0 758 }
nuclear@0 759
nuclear@0 760 /* called by user to write a row of image data */
nuclear@0 761 void PNGAPI
nuclear@0 762 png_write_row(png_structp png_ptr, png_bytep row)
nuclear@0 763 {
nuclear@0 764 if (png_ptr == NULL)
nuclear@0 765 return;
nuclear@0 766 png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
nuclear@0 767 png_ptr->row_number, png_ptr->pass);
nuclear@0 768
nuclear@0 769 /* initialize transformations and other stuff if first time */
nuclear@0 770 if (png_ptr->row_number == 0 && png_ptr->pass == 0)
nuclear@0 771 {
nuclear@0 772 /* make sure we wrote the header info */
nuclear@0 773 if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
nuclear@0 774 png_error(png_ptr,
nuclear@0 775 "png_write_info was never called before png_write_row.");
nuclear@0 776
nuclear@0 777 /* check for transforms that have been set but were defined out */
nuclear@0 778 #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
nuclear@0 779 if (png_ptr->transformations & PNG_INVERT_MONO)
nuclear@0 780 png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
nuclear@0 781 #endif
nuclear@0 782 #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
nuclear@0 783 if (png_ptr->transformations & PNG_FILLER)
nuclear@0 784 png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
nuclear@0 785 #endif
nuclear@0 786 #if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@0 787 if (png_ptr->transformations & PNG_PACKSWAP)
nuclear@0 788 png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
nuclear@0 789 #endif
nuclear@0 790 #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
nuclear@0 791 if (png_ptr->transformations & PNG_PACK)
nuclear@0 792 png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
nuclear@0 793 #endif
nuclear@0 794 #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@0 795 if (png_ptr->transformations & PNG_SHIFT)
nuclear@0 796 png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
nuclear@0 797 #endif
nuclear@0 798 #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
nuclear@0 799 if (png_ptr->transformations & PNG_BGR)
nuclear@0 800 png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
nuclear@0 801 #endif
nuclear@0 802 #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
nuclear@0 803 if (png_ptr->transformations & PNG_SWAP_BYTES)
nuclear@0 804 png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
nuclear@0 805 #endif
nuclear@0 806
nuclear@0 807 png_write_start_row(png_ptr);
nuclear@0 808 }
nuclear@0 809
nuclear@0 810 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@0 811 /* if interlaced and not interested in row, return */
nuclear@0 812 if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
nuclear@0 813 {
nuclear@0 814 switch (png_ptr->pass)
nuclear@0 815 {
nuclear@0 816 case 0:
nuclear@0 817 if (png_ptr->row_number & 0x07)
nuclear@0 818 {
nuclear@0 819 png_write_finish_row(png_ptr);
nuclear@0 820 return;
nuclear@0 821 }
nuclear@0 822 break;
nuclear@0 823 case 1:
nuclear@0 824 if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
nuclear@0 825 {
nuclear@0 826 png_write_finish_row(png_ptr);
nuclear@0 827 return;
nuclear@0 828 }
nuclear@0 829 break;
nuclear@0 830 case 2:
nuclear@0 831 if ((png_ptr->row_number & 0x07) != 4)
nuclear@0 832 {
nuclear@0 833 png_write_finish_row(png_ptr);
nuclear@0 834 return;
nuclear@0 835 }
nuclear@0 836 break;
nuclear@0 837 case 3:
nuclear@0 838 if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
nuclear@0 839 {
nuclear@0 840 png_write_finish_row(png_ptr);
nuclear@0 841 return;
nuclear@0 842 }
nuclear@0 843 break;
nuclear@0 844 case 4:
nuclear@0 845 if ((png_ptr->row_number & 0x03) != 2)
nuclear@0 846 {
nuclear@0 847 png_write_finish_row(png_ptr);
nuclear@0 848 return;
nuclear@0 849 }
nuclear@0 850 break;
nuclear@0 851 case 5:
nuclear@0 852 if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
nuclear@0 853 {
nuclear@0 854 png_write_finish_row(png_ptr);
nuclear@0 855 return;
nuclear@0 856 }
nuclear@0 857 break;
nuclear@0 858 case 6:
nuclear@0 859 if (!(png_ptr->row_number & 0x01))
nuclear@0 860 {
nuclear@0 861 png_write_finish_row(png_ptr);
nuclear@0 862 return;
nuclear@0 863 }
nuclear@0 864 break;
nuclear@0 865 }
nuclear@0 866 }
nuclear@0 867 #endif
nuclear@0 868
nuclear@0 869 /* set up row info for transformations */
nuclear@0 870 png_ptr->row_info.color_type = png_ptr->color_type;
nuclear@0 871 png_ptr->row_info.width = png_ptr->usr_width;
nuclear@0 872 png_ptr->row_info.channels = png_ptr->usr_channels;
nuclear@0 873 png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
nuclear@0 874 png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
nuclear@0 875 png_ptr->row_info.channels);
nuclear@0 876
nuclear@0 877 png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
nuclear@0 878 png_ptr->row_info.width);
nuclear@0 879
nuclear@0 880 png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
nuclear@0 881 png_debug1(3, "row_info->width = %lu\n", png_ptr->row_info.width);
nuclear@0 882 png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);
nuclear@0 883 png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
nuclear@0 884 png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
nuclear@0 885 png_debug1(3, "row_info->rowbytes = %lu\n", png_ptr->row_info.rowbytes);
nuclear@0 886
nuclear@0 887 /* Copy user's row into buffer, leaving room for filter byte. */
nuclear@0 888 png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
nuclear@0 889 png_ptr->row_info.rowbytes);
nuclear@0 890
nuclear@0 891 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@0 892 /* handle interlacing */
nuclear@0 893 if (png_ptr->interlaced && png_ptr->pass < 6 &&
nuclear@0 894 (png_ptr->transformations & PNG_INTERLACE))
nuclear@0 895 {
nuclear@0 896 png_do_write_interlace(&(png_ptr->row_info),
nuclear@0 897 png_ptr->row_buf + 1, png_ptr->pass);
nuclear@0 898 /* this should always get caught above, but still ... */
nuclear@0 899 if (!(png_ptr->row_info.width))
nuclear@0 900 {
nuclear@0 901 png_write_finish_row(png_ptr);
nuclear@0 902 return;
nuclear@0 903 }
nuclear@0 904 }
nuclear@0 905 #endif
nuclear@0 906
nuclear@0 907 /* handle other transformations */
nuclear@0 908 if (png_ptr->transformations)
nuclear@0 909 png_do_write_transformations(png_ptr);
nuclear@0 910
nuclear@0 911 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@0 912 /* Write filter_method 64 (intrapixel differencing) only if
nuclear@0 913 * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
nuclear@0 914 * 2. Libpng did not write a PNG signature (this filter_method is only
nuclear@0 915 * used in PNG datastreams that are embedded in MNG datastreams) and
nuclear@0 916 * 3. The application called png_permit_mng_features with a mask that
nuclear@0 917 * included PNG_FLAG_MNG_FILTER_64 and
nuclear@0 918 * 4. The filter_method is 64 and
nuclear@0 919 * 5. The color_type is RGB or RGBA
nuclear@0 920 */
nuclear@0 921 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
nuclear@0 922 (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
nuclear@0 923 {
nuclear@0 924 /* Intrapixel differencing */
nuclear@0 925 png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
nuclear@0 926 }
nuclear@0 927 #endif
nuclear@0 928
nuclear@0 929 /* Find a filter if necessary, filter the row and write it out. */
nuclear@0 930 png_write_find_filter(png_ptr, &(png_ptr->row_info));
nuclear@0 931
nuclear@0 932 if (png_ptr->write_row_fn != NULL)
nuclear@0 933 (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
nuclear@0 934 }
nuclear@0 935
nuclear@0 936 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@0 937 /* Set the automatic flush interval or 0 to turn flushing off */
nuclear@0 938 void PNGAPI
nuclear@0 939 png_set_flush(png_structp png_ptr, int nrows)
nuclear@0 940 {
nuclear@0 941 png_debug(1, "in png_set_flush\n");
nuclear@0 942 if (png_ptr == NULL)
nuclear@0 943 return;
nuclear@0 944 png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
nuclear@0 945 }
nuclear@0 946
nuclear@0 947 /* flush the current output buffers now */
nuclear@0 948 void PNGAPI
nuclear@0 949 png_write_flush(png_structp png_ptr)
nuclear@0 950 {
nuclear@0 951 int wrote_IDAT;
nuclear@0 952
nuclear@0 953 png_debug(1, "in png_write_flush\n");
nuclear@0 954 if (png_ptr == NULL)
nuclear@0 955 return;
nuclear@0 956 /* We have already written out all of the data */
nuclear@0 957 if (png_ptr->row_number >= png_ptr->num_rows)
nuclear@0 958 return;
nuclear@0 959
nuclear@0 960 do
nuclear@0 961 {
nuclear@0 962 int ret;
nuclear@0 963
nuclear@0 964 /* compress the data */
nuclear@0 965 ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
nuclear@0 966 wrote_IDAT = 0;
nuclear@0 967
nuclear@0 968 /* check for compression errors */
nuclear@0 969 if (ret != Z_OK)
nuclear@0 970 {
nuclear@0 971 if (png_ptr->zstream.msg != NULL)
nuclear@0 972 png_error(png_ptr, png_ptr->zstream.msg);
nuclear@0 973 else
nuclear@0 974 png_error(png_ptr, "zlib error");
nuclear@0 975 }
nuclear@0 976
nuclear@0 977 if (!(png_ptr->zstream.avail_out))
nuclear@0 978 {
nuclear@0 979 /* write the IDAT and reset the zlib output buffer */
nuclear@0 980 png_write_IDAT(png_ptr, png_ptr->zbuf,
nuclear@0 981 png_ptr->zbuf_size);
nuclear@0 982 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@0 983 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@0 984 wrote_IDAT = 1;
nuclear@0 985 }
nuclear@0 986 } while(wrote_IDAT == 1);
nuclear@0 987
nuclear@0 988 /* If there is any data left to be output, write it into a new IDAT */
nuclear@0 989 if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
nuclear@0 990 {
nuclear@0 991 /* write the IDAT and reset the zlib output buffer */
nuclear@0 992 png_write_IDAT(png_ptr, png_ptr->zbuf,
nuclear@0 993 png_ptr->zbuf_size - png_ptr->zstream.avail_out);
nuclear@0 994 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@0 995 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@0 996 }
nuclear@0 997 png_ptr->flush_rows = 0;
nuclear@0 998 png_flush(png_ptr);
nuclear@0 999 }
nuclear@0 1000 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
nuclear@0 1001
nuclear@0 1002 /* free all memory used by the write */
nuclear@0 1003 void PNGAPI
nuclear@0 1004 png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
nuclear@0 1005 {
nuclear@0 1006 png_structp png_ptr = NULL;
nuclear@0 1007 png_infop info_ptr = NULL;
nuclear@0 1008 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1009 png_free_ptr free_fn = NULL;
nuclear@0 1010 png_voidp mem_ptr = NULL;
nuclear@0 1011 #endif
nuclear@0 1012
nuclear@0 1013 png_debug(1, "in png_destroy_write_struct\n");
nuclear@0 1014 if (png_ptr_ptr != NULL)
nuclear@0 1015 {
nuclear@0 1016 png_ptr = *png_ptr_ptr;
nuclear@0 1017 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1018 free_fn = png_ptr->free_fn;
nuclear@0 1019 mem_ptr = png_ptr->mem_ptr;
nuclear@0 1020 #endif
nuclear@0 1021 }
nuclear@0 1022
nuclear@0 1023 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1024 if (png_ptr != NULL)
nuclear@0 1025 {
nuclear@0 1026 free_fn = png_ptr->free_fn;
nuclear@0 1027 mem_ptr = png_ptr->mem_ptr;
nuclear@0 1028 }
nuclear@0 1029 #endif
nuclear@0 1030
nuclear@0 1031 if (info_ptr_ptr != NULL)
nuclear@0 1032 info_ptr = *info_ptr_ptr;
nuclear@0 1033
nuclear@0 1034 if (info_ptr != NULL)
nuclear@0 1035 {
nuclear@0 1036 if (png_ptr != NULL)
nuclear@0 1037 {
nuclear@0 1038 png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
nuclear@0 1039
nuclear@0 1040 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@0 1041 if (png_ptr->num_chunk_list)
nuclear@0 1042 {
nuclear@0 1043 png_free(png_ptr, png_ptr->chunk_list);
nuclear@0 1044 png_ptr->chunk_list=NULL;
nuclear@0 1045 png_ptr->num_chunk_list = 0;
nuclear@0 1046 }
nuclear@0 1047 #endif
nuclear@0 1048 }
nuclear@0 1049
nuclear@0 1050 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1051 png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
nuclear@0 1052 (png_voidp)mem_ptr);
nuclear@0 1053 #else
nuclear@0 1054 png_destroy_struct((png_voidp)info_ptr);
nuclear@0 1055 #endif
nuclear@0 1056 *info_ptr_ptr = NULL;
nuclear@0 1057 }
nuclear@0 1058
nuclear@0 1059 if (png_ptr != NULL)
nuclear@0 1060 {
nuclear@0 1061 png_write_destroy(png_ptr);
nuclear@0 1062 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1063 png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
nuclear@0 1064 (png_voidp)mem_ptr);
nuclear@0 1065 #else
nuclear@0 1066 png_destroy_struct((png_voidp)png_ptr);
nuclear@0 1067 #endif
nuclear@0 1068 *png_ptr_ptr = NULL;
nuclear@0 1069 }
nuclear@0 1070 }
nuclear@0 1071
nuclear@0 1072
nuclear@0 1073 /* Free any memory used in png_ptr struct (old method) */
nuclear@0 1074 void /* PRIVATE */
nuclear@0 1075 png_write_destroy(png_structp png_ptr)
nuclear@0 1076 {
nuclear@0 1077 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 1078 jmp_buf tmp_jmp; /* save jump buffer */
nuclear@0 1079 #endif
nuclear@0 1080 png_error_ptr error_fn;
nuclear@0 1081 png_error_ptr warning_fn;
nuclear@0 1082 png_voidp error_ptr;
nuclear@0 1083 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1084 png_free_ptr free_fn;
nuclear@0 1085 #endif
nuclear@0 1086
nuclear@0 1087 png_debug(1, "in png_write_destroy\n");
nuclear@0 1088 /* free any memory zlib uses */
nuclear@0 1089 deflateEnd(&png_ptr->zstream);
nuclear@0 1090
nuclear@0 1091 /* free our memory. png_free checks NULL for us. */
nuclear@0 1092 png_free(png_ptr, png_ptr->zbuf);
nuclear@0 1093 png_free(png_ptr, png_ptr->row_buf);
nuclear@0 1094 #ifndef PNG_NO_WRITE_FILTER
nuclear@0 1095 png_free(png_ptr, png_ptr->prev_row);
nuclear@0 1096 png_free(png_ptr, png_ptr->sub_row);
nuclear@0 1097 png_free(png_ptr, png_ptr->up_row);
nuclear@0 1098 png_free(png_ptr, png_ptr->avg_row);
nuclear@0 1099 png_free(png_ptr, png_ptr->paeth_row);
nuclear@0 1100 #endif
nuclear@0 1101
nuclear@0 1102 #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@0 1103 png_free(png_ptr, png_ptr->time_buffer);
nuclear@0 1104 #endif
nuclear@0 1105
nuclear@0 1106 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@0 1107 png_free(png_ptr, png_ptr->prev_filters);
nuclear@0 1108 png_free(png_ptr, png_ptr->filter_weights);
nuclear@0 1109 png_free(png_ptr, png_ptr->inv_filter_weights);
nuclear@0 1110 png_free(png_ptr, png_ptr->filter_costs);
nuclear@0 1111 png_free(png_ptr, png_ptr->inv_filter_costs);
nuclear@0 1112 #endif
nuclear@0 1113
nuclear@0 1114 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 1115 /* reset structure */
nuclear@0 1116 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@0 1117 #endif
nuclear@0 1118
nuclear@0 1119 error_fn = png_ptr->error_fn;
nuclear@0 1120 warning_fn = png_ptr->warning_fn;
nuclear@0 1121 error_ptr = png_ptr->error_ptr;
nuclear@0 1122 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1123 free_fn = png_ptr->free_fn;
nuclear@0 1124 #endif
nuclear@0 1125
nuclear@0 1126 png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@0 1127
nuclear@0 1128 png_ptr->error_fn = error_fn;
nuclear@0 1129 png_ptr->warning_fn = warning_fn;
nuclear@0 1130 png_ptr->error_ptr = error_ptr;
nuclear@0 1131 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@0 1132 png_ptr->free_fn = free_fn;
nuclear@0 1133 #endif
nuclear@0 1134
nuclear@0 1135 #ifdef PNG_SETJMP_SUPPORTED
nuclear@0 1136 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@0 1137 #endif
nuclear@0 1138 }
nuclear@0 1139
nuclear@0 1140 /* Allow the application to select one or more row filters to use. */
nuclear@0 1141 void PNGAPI
nuclear@0 1142 png_set_filter(png_structp png_ptr, int method, int filters)
nuclear@0 1143 {
nuclear@0 1144 png_debug(1, "in png_set_filter\n");
nuclear@0 1145 if (png_ptr == NULL)
nuclear@0 1146 return;
nuclear@0 1147 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@0 1148 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
nuclear@0 1149 (method == PNG_INTRAPIXEL_DIFFERENCING))
nuclear@0 1150 method = PNG_FILTER_TYPE_BASE;
nuclear@0 1151 #endif
nuclear@0 1152 if (method == PNG_FILTER_TYPE_BASE)
nuclear@0 1153 {
nuclear@0 1154 switch (filters & (PNG_ALL_FILTERS | 0x07))
nuclear@0 1155 {
nuclear@0 1156 #ifndef PNG_NO_WRITE_FILTER
nuclear@0 1157 case 5:
nuclear@0 1158 case 6:
nuclear@0 1159 case 7: png_warning(png_ptr, "Unknown row filter for method 0");
nuclear@0 1160 #endif /* PNG_NO_WRITE_FILTER */
nuclear@0 1161 case PNG_FILTER_VALUE_NONE:
nuclear@0 1162 png_ptr->do_filter=PNG_FILTER_NONE; break;
nuclear@0 1163 #ifndef PNG_NO_WRITE_FILTER
nuclear@0 1164 case PNG_FILTER_VALUE_SUB:
nuclear@0 1165 png_ptr->do_filter=PNG_FILTER_SUB; break;
nuclear@0 1166 case PNG_FILTER_VALUE_UP:
nuclear@0 1167 png_ptr->do_filter=PNG_FILTER_UP; break;
nuclear@0 1168 case PNG_FILTER_VALUE_AVG:
nuclear@0 1169 png_ptr->do_filter=PNG_FILTER_AVG; break;
nuclear@0 1170 case PNG_FILTER_VALUE_PAETH:
nuclear@0 1171 png_ptr->do_filter=PNG_FILTER_PAETH; break;
nuclear@0 1172 default: png_ptr->do_filter = (png_byte)filters; break;
nuclear@0 1173 #else
nuclear@0 1174 default: png_warning(png_ptr, "Unknown row filter for method 0");
nuclear@0 1175 #endif /* PNG_NO_WRITE_FILTER */
nuclear@0 1176 }
nuclear@0 1177
nuclear@0 1178 /* If we have allocated the row_buf, this means we have already started
nuclear@0 1179 * with the image and we should have allocated all of the filter buffers
nuclear@0 1180 * that have been selected. If prev_row isn't already allocated, then
nuclear@0 1181 * it is too late to start using the filters that need it, since we
nuclear@0 1182 * will be missing the data in the previous row. If an application
nuclear@0 1183 * wants to start and stop using particular filters during compression,
nuclear@0 1184 * it should start out with all of the filters, and then add and
nuclear@0 1185 * remove them after the start of compression.
nuclear@0 1186 */
nuclear@0 1187 if (png_ptr->row_buf != NULL)
nuclear@0 1188 {
nuclear@0 1189 #ifndef PNG_NO_WRITE_FILTER
nuclear@0 1190 if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
nuclear@0 1191 {
nuclear@0 1192 png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
nuclear@0 1193 (png_ptr->rowbytes + 1));
nuclear@0 1194 png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
nuclear@0 1195 }
nuclear@0 1196
nuclear@0 1197 if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
nuclear@0 1198 {
nuclear@0 1199 if (png_ptr->prev_row == NULL)
nuclear@0 1200 {
nuclear@0 1201 png_warning(png_ptr, "Can't add Up filter after starting");
nuclear@0 1202 png_ptr->do_filter &= ~PNG_FILTER_UP;
nuclear@0 1203 }
nuclear@0 1204 else
nuclear@0 1205 {
nuclear@0 1206 png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
nuclear@0 1207 (png_ptr->rowbytes + 1));
nuclear@0 1208 png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
nuclear@0 1209 }
nuclear@0 1210 }
nuclear@0 1211
nuclear@0 1212 if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
nuclear@0 1213 {
nuclear@0 1214 if (png_ptr->prev_row == NULL)
nuclear@0 1215 {
nuclear@0 1216 png_warning(png_ptr, "Can't add Average filter after starting");
nuclear@0 1217 png_ptr->do_filter &= ~PNG_FILTER_AVG;
nuclear@0 1218 }
nuclear@0 1219 else
nuclear@0 1220 {
nuclear@0 1221 png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
nuclear@0 1222 (png_ptr->rowbytes + 1));
nuclear@0 1223 png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
nuclear@0 1224 }
nuclear@0 1225 }
nuclear@0 1226
nuclear@0 1227 if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
nuclear@0 1228 png_ptr->paeth_row == NULL)
nuclear@0 1229 {
nuclear@0 1230 if (png_ptr->prev_row == NULL)
nuclear@0 1231 {
nuclear@0 1232 png_warning(png_ptr, "Can't add Paeth filter after starting");
nuclear@0 1233 png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
nuclear@0 1234 }
nuclear@0 1235 else
nuclear@0 1236 {
nuclear@0 1237 png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
nuclear@0 1238 (png_ptr->rowbytes + 1));
nuclear@0 1239 png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
nuclear@0 1240 }
nuclear@0 1241 }
nuclear@0 1242
nuclear@0 1243 if (png_ptr->do_filter == PNG_NO_FILTERS)
nuclear@0 1244 #endif /* PNG_NO_WRITE_FILTER */
nuclear@0 1245 png_ptr->do_filter = PNG_FILTER_NONE;
nuclear@0 1246 }
nuclear@0 1247 }
nuclear@0 1248 else
nuclear@0 1249 png_error(png_ptr, "Unknown custom filter method");
nuclear@0 1250 }
nuclear@0 1251
nuclear@0 1252 /* This allows us to influence the way in which libpng chooses the "best"
nuclear@0 1253 * filter for the current scanline. While the "minimum-sum-of-absolute-
nuclear@0 1254 * differences metric is relatively fast and effective, there is some
nuclear@0 1255 * question as to whether it can be improved upon by trying to keep the
nuclear@0 1256 * filtered data going to zlib more consistent, hopefully resulting in
nuclear@0 1257 * better compression.
nuclear@0 1258 */
nuclear@0 1259 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */
nuclear@0 1260 void PNGAPI
nuclear@0 1261 png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
nuclear@0 1262 int num_weights, png_doublep filter_weights,
nuclear@0 1263 png_doublep filter_costs)
nuclear@0 1264 {
nuclear@0 1265 int i;
nuclear@0 1266
nuclear@0 1267 png_debug(1, "in png_set_filter_heuristics\n");
nuclear@0 1268 if (png_ptr == NULL)
nuclear@0 1269 return;
nuclear@0 1270 if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
nuclear@0 1271 {
nuclear@0 1272 png_warning(png_ptr, "Unknown filter heuristic method");
nuclear@0 1273 return;
nuclear@0 1274 }
nuclear@0 1275
nuclear@0 1276 if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
nuclear@0 1277 {
nuclear@0 1278 heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
nuclear@0 1279 }
nuclear@0 1280
nuclear@0 1281 if (num_weights < 0 || filter_weights == NULL ||
nuclear@0 1282 heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
nuclear@0 1283 {
nuclear@0 1284 num_weights = 0;
nuclear@0 1285 }
nuclear@0 1286
nuclear@0 1287 png_ptr->num_prev_filters = (png_byte)num_weights;
nuclear@0 1288 png_ptr->heuristic_method = (png_byte)heuristic_method;
nuclear@0 1289
nuclear@0 1290 if (num_weights > 0)
nuclear@0 1291 {
nuclear@0 1292 if (png_ptr->prev_filters == NULL)
nuclear@0 1293 {
nuclear@0 1294 png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
nuclear@0 1295 (png_uint_32)(png_sizeof(png_byte) * num_weights));
nuclear@0 1296
nuclear@0 1297 /* To make sure that the weighting starts out fairly */
nuclear@0 1298 for (i = 0; i < num_weights; i++)
nuclear@0 1299 {
nuclear@0 1300 png_ptr->prev_filters[i] = 255;
nuclear@0 1301 }
nuclear@0 1302 }
nuclear@0 1303
nuclear@0 1304 if (png_ptr->filter_weights == NULL)
nuclear@0 1305 {
nuclear@0 1306 png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
nuclear@0 1307 (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
nuclear@0 1308
nuclear@0 1309 png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
nuclear@0 1310 (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
nuclear@0 1311 for (i = 0; i < num_weights; i++)
nuclear@0 1312 {
nuclear@0 1313 png_ptr->inv_filter_weights[i] =
nuclear@0 1314 png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
nuclear@0 1315 }
nuclear@0 1316 }
nuclear@0 1317
nuclear@0 1318 for (i = 0; i < num_weights; i++)
nuclear@0 1319 {
nuclear@0 1320 if (filter_weights[i] < 0.0)
nuclear@0 1321 {
nuclear@0 1322 png_ptr->inv_filter_weights[i] =
nuclear@0 1323 png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
nuclear@0 1324 }
nuclear@0 1325 else
nuclear@0 1326 {
nuclear@0 1327 png_ptr->inv_filter_weights[i] =
nuclear@0 1328 (png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);
nuclear@0 1329 png_ptr->filter_weights[i] =
nuclear@0 1330 (png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
nuclear@0 1331 }
nuclear@0 1332 }
nuclear@0 1333 }
nuclear@0 1334
nuclear@0 1335 /* If, in the future, there are other filter methods, this would
nuclear@0 1336 * need to be based on png_ptr->filter.
nuclear@0 1337 */
nuclear@0 1338 if (png_ptr->filter_costs == NULL)
nuclear@0 1339 {
nuclear@0 1340 png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
nuclear@0 1341 (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
nuclear@0 1342
nuclear@0 1343 png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
nuclear@0 1344 (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
nuclear@0 1345
nuclear@0 1346 for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
nuclear@0 1347 {
nuclear@0 1348 png_ptr->inv_filter_costs[i] =
nuclear@0 1349 png_ptr->filter_costs[i] = PNG_COST_FACTOR;
nuclear@0 1350 }
nuclear@0 1351 }
nuclear@0 1352
nuclear@0 1353 /* Here is where we set the relative costs of the different filters. We
nuclear@0 1354 * should take the desired compression level into account when setting
nuclear@0 1355 * the costs, so that Paeth, for instance, has a high relative cost at low
nuclear@0 1356 * compression levels, while it has a lower relative cost at higher
nuclear@0 1357 * compression settings. The filter types are in order of increasing
nuclear@0 1358 * relative cost, so it would be possible to do this with an algorithm.
nuclear@0 1359 */
nuclear@0 1360 for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
nuclear@0 1361 {
nuclear@0 1362 if (filter_costs == NULL || filter_costs[i] < 0.0)
nuclear@0 1363 {
nuclear@0 1364 png_ptr->inv_filter_costs[i] =
nuclear@0 1365 png_ptr->filter_costs[i] = PNG_COST_FACTOR;
nuclear@0 1366 }
nuclear@0 1367 else if (filter_costs[i] >= 1.0)
nuclear@0 1368 {
nuclear@0 1369 png_ptr->inv_filter_costs[i] =
nuclear@0 1370 (png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);
nuclear@0 1371 png_ptr->filter_costs[i] =
nuclear@0 1372 (png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);
nuclear@0 1373 }
nuclear@0 1374 }
nuclear@0 1375 }
nuclear@0 1376 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
nuclear@0 1377
nuclear@0 1378 void PNGAPI
nuclear@0 1379 png_set_compression_level(png_structp png_ptr, int level)
nuclear@0 1380 {
nuclear@0 1381 png_debug(1, "in png_set_compression_level\n");
nuclear@0 1382 if (png_ptr == NULL)
nuclear@0 1383 return;
nuclear@0 1384 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
nuclear@0 1385 png_ptr->zlib_level = level;
nuclear@0 1386 }
nuclear@0 1387
nuclear@0 1388 void PNGAPI
nuclear@0 1389 png_set_compression_mem_level(png_structp png_ptr, int mem_level)
nuclear@0 1390 {
nuclear@0 1391 png_debug(1, "in png_set_compression_mem_level\n");
nuclear@0 1392 if (png_ptr == NULL)
nuclear@0 1393 return;
nuclear@0 1394 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
nuclear@0 1395 png_ptr->zlib_mem_level = mem_level;
nuclear@0 1396 }
nuclear@0 1397
nuclear@0 1398 void PNGAPI
nuclear@0 1399 png_set_compression_strategy(png_structp png_ptr, int strategy)
nuclear@0 1400 {
nuclear@0 1401 png_debug(1, "in png_set_compression_strategy\n");
nuclear@0 1402 if (png_ptr == NULL)
nuclear@0 1403 return;
nuclear@0 1404 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
nuclear@0 1405 png_ptr->zlib_strategy = strategy;
nuclear@0 1406 }
nuclear@0 1407
nuclear@0 1408 void PNGAPI
nuclear@0 1409 png_set_compression_window_bits(png_structp png_ptr, int window_bits)
nuclear@0 1410 {
nuclear@0 1411 if (png_ptr == NULL)
nuclear@0 1412 return;
nuclear@0 1413 if (window_bits > 15)
nuclear@0 1414 png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
nuclear@0 1415 else if (window_bits < 8)
nuclear@0 1416 png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
nuclear@0 1417 #ifndef WBITS_8_OK
nuclear@0 1418 /* avoid libpng bug with 256-byte windows */
nuclear@0 1419 if (window_bits == 8)
nuclear@0 1420 {
nuclear@0 1421 png_warning(png_ptr, "Compression window is being reset to 512");
nuclear@0 1422 window_bits=9;
nuclear@0 1423 }
nuclear@0 1424 #endif
nuclear@0 1425 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
nuclear@0 1426 png_ptr->zlib_window_bits = window_bits;
nuclear@0 1427 }
nuclear@0 1428
nuclear@0 1429 void PNGAPI
nuclear@0 1430 png_set_compression_method(png_structp png_ptr, int method)
nuclear@0 1431 {
nuclear@0 1432 png_debug(1, "in png_set_compression_method\n");
nuclear@0 1433 if (png_ptr == NULL)
nuclear@0 1434 return;
nuclear@0 1435 if (method != 8)
nuclear@0 1436 png_warning(png_ptr, "Only compression method 8 is supported by PNG");
nuclear@0 1437 png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
nuclear@0 1438 png_ptr->zlib_method = method;
nuclear@0 1439 }
nuclear@0 1440
nuclear@0 1441 void PNGAPI
nuclear@0 1442 png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
nuclear@0 1443 {
nuclear@0 1444 if (png_ptr == NULL)
nuclear@0 1445 return;
nuclear@0 1446 png_ptr->write_row_fn = write_row_fn;
nuclear@0 1447 }
nuclear@0 1448
nuclear@0 1449 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
nuclear@0 1450 void PNGAPI
nuclear@0 1451 png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
nuclear@0 1452 write_user_transform_fn)
nuclear@0 1453 {
nuclear@0 1454 png_debug(1, "in png_set_write_user_transform_fn\n");
nuclear@0 1455 if (png_ptr == NULL)
nuclear@0 1456 return;
nuclear@0 1457 png_ptr->transformations |= PNG_USER_TRANSFORM;
nuclear@0 1458 png_ptr->write_user_transform_fn = write_user_transform_fn;
nuclear@0 1459 }
nuclear@0 1460 #endif
nuclear@0 1461
nuclear@0 1462
nuclear@0 1463 #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@0 1464 void PNGAPI
nuclear@0 1465 png_write_png(png_structp png_ptr, png_infop info_ptr,
nuclear@0 1466 int transforms, voidp params)
nuclear@0 1467 {
nuclear@0 1468 if (png_ptr == NULL || info_ptr == NULL)
nuclear@0 1469 return;
nuclear@0 1470 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
nuclear@0 1471 /* invert the alpha channel from opacity to transparency */
nuclear@0 1472 if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
nuclear@0 1473 png_set_invert_alpha(png_ptr);
nuclear@0 1474 #endif
nuclear@0 1475
nuclear@0 1476 /* Write the file header information. */
nuclear@0 1477 png_write_info(png_ptr, info_ptr);
nuclear@0 1478
nuclear@0 1479 /* ------ these transformations don't touch the info structure ------- */
nuclear@0 1480
nuclear@0 1481 #if defined(PNG_WRITE_INVERT_SUPPORTED)
nuclear@0 1482 /* invert monochrome pixels */
nuclear@0 1483 if (transforms & PNG_TRANSFORM_INVERT_MONO)
nuclear@0 1484 png_set_invert_mono(png_ptr);
nuclear@0 1485 #endif
nuclear@0 1486
nuclear@0 1487 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
nuclear@0 1488 /* Shift the pixels up to a legal bit depth and fill in
nuclear@0 1489 * as appropriate to correctly scale the image.
nuclear@0 1490 */
nuclear@0 1491 if ((transforms & PNG_TRANSFORM_SHIFT)
nuclear@0 1492 && (info_ptr->valid & PNG_INFO_sBIT))
nuclear@0 1493 png_set_shift(png_ptr, &info_ptr->sig_bit);
nuclear@0 1494 #endif
nuclear@0 1495
nuclear@0 1496 #if defined(PNG_WRITE_PACK_SUPPORTED)
nuclear@0 1497 /* pack pixels into bytes */
nuclear@0 1498 if (transforms & PNG_TRANSFORM_PACKING)
nuclear@0 1499 png_set_packing(png_ptr);
nuclear@0 1500 #endif
nuclear@0 1501
nuclear@0 1502 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
nuclear@0 1503 /* swap location of alpha bytes from ARGB to RGBA */
nuclear@0 1504 if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
nuclear@0 1505 png_set_swap_alpha(png_ptr);
nuclear@0 1506 #endif
nuclear@0 1507
nuclear@0 1508 #if defined(PNG_WRITE_FILLER_SUPPORTED)
nuclear@0 1509 /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
nuclear@0 1510 * RGB (4 channels -> 3 channels). The second parameter is not used.
nuclear@0 1511 */
nuclear@0 1512 if (transforms & PNG_TRANSFORM_STRIP_FILLER)
nuclear@0 1513 png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
nuclear@0 1514 #endif
nuclear@0 1515
nuclear@0 1516 #if defined(PNG_WRITE_BGR_SUPPORTED)
nuclear@0 1517 /* flip BGR pixels to RGB */
nuclear@0 1518 if (transforms & PNG_TRANSFORM_BGR)
nuclear@0 1519 png_set_bgr(png_ptr);
nuclear@0 1520 #endif
nuclear@0 1521
nuclear@0 1522 #if defined(PNG_WRITE_SWAP_SUPPORTED)
nuclear@0 1523 /* swap bytes of 16-bit files to most significant byte first */
nuclear@0 1524 if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
nuclear@0 1525 png_set_swap(png_ptr);
nuclear@0 1526 #endif
nuclear@0 1527
nuclear@0 1528 #if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
nuclear@0 1529 /* swap bits of 1, 2, 4 bit packed pixel formats */
nuclear@0 1530 if (transforms & PNG_TRANSFORM_PACKSWAP)
nuclear@0 1531 png_set_packswap(png_ptr);
nuclear@0 1532 #endif
nuclear@0 1533
nuclear@0 1534 /* ----------------------- end of transformations ------------------- */
nuclear@0 1535
nuclear@0 1536 /* write the bits */
nuclear@0 1537 if (info_ptr->valid & PNG_INFO_IDAT)
nuclear@0 1538 png_write_image(png_ptr, info_ptr->row_pointers);
nuclear@0 1539
nuclear@0 1540 /* It is REQUIRED to call this to finish writing the rest of the file */
nuclear@0 1541 png_write_end(png_ptr, info_ptr);
nuclear@0 1542
nuclear@0 1543 transforms = transforms; /* quiet compiler warnings */
nuclear@0 1544 params = params;
nuclear@0 1545 }
nuclear@0 1546 #endif
nuclear@0 1547 #endif /* PNG_WRITE_SUPPORTED */