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annotate libs/libpng/pngwrite.c @ 20:c14613d27a3a

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