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

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animation controls for easier screenshot grabbing
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 02 Oct 2015 04:54:55 +0300
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children
rev   line source
nuclear@2 1
nuclear@2 2 /* pngread.c - read a PNG file
nuclear@2 3 *
nuclear@2 4 * Last changed in libpng 1.2.30 [August 15, 2008]
nuclear@2 5 * For conditions of distribution and use, see copyright notice in png.h
nuclear@2 6 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@2 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@2 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@2 9 *
nuclear@2 10 * This file contains routines that an application calls directly to
nuclear@2 11 * read a PNG file or stream.
nuclear@2 12 */
nuclear@2 13
nuclear@2 14 #define PNG_INTERNAL
nuclear@2 15 #include "png.h"
nuclear@2 16 #if defined(PNG_READ_SUPPORTED)
nuclear@2 17
nuclear@2 18 /* Create a PNG structure for reading, and allocate any memory needed. */
nuclear@2 19 png_structp PNGAPI
nuclear@2 20 png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@2 21 png_error_ptr error_fn, png_error_ptr warn_fn)
nuclear@2 22 {
nuclear@2 23
nuclear@2 24 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 25 return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
nuclear@2 26 warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
nuclear@2 27 }
nuclear@2 28
nuclear@2 29 /* Alternate create PNG structure for reading, and allocate any memory needed. */
nuclear@2 30 png_structp PNGAPI
nuclear@2 31 png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@2 32 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
nuclear@2 33 png_malloc_ptr malloc_fn, png_free_ptr free_fn)
nuclear@2 34 {
nuclear@2 35 #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@2 36
nuclear@2 37 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 38 volatile
nuclear@2 39 #endif
nuclear@2 40 png_structp png_ptr;
nuclear@2 41
nuclear@2 42 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 43 #ifdef USE_FAR_KEYWORD
nuclear@2 44 jmp_buf jmpbuf;
nuclear@2 45 #endif
nuclear@2 46 #endif
nuclear@2 47
nuclear@2 48 int i;
nuclear@2 49
nuclear@2 50 png_debug(1, "in png_create_read_struct\n");
nuclear@2 51 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 52 png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
nuclear@2 53 (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
nuclear@2 54 #else
nuclear@2 55 png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@2 56 #endif
nuclear@2 57 if (png_ptr == NULL)
nuclear@2 58 return (NULL);
nuclear@2 59
nuclear@2 60 /* added at libpng-1.2.6 */
nuclear@2 61 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@2 62 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@2 63 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@2 64 #endif
nuclear@2 65
nuclear@2 66 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 67 #ifdef USE_FAR_KEYWORD
nuclear@2 68 if (setjmp(jmpbuf))
nuclear@2 69 #else
nuclear@2 70 if (setjmp(png_ptr->jmpbuf))
nuclear@2 71 #endif
nuclear@2 72 {
nuclear@2 73 png_free(png_ptr, png_ptr->zbuf);
nuclear@2 74 png_ptr->zbuf = NULL;
nuclear@2 75 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 76 png_destroy_struct_2((png_voidp)png_ptr,
nuclear@2 77 (png_free_ptr)free_fn, (png_voidp)mem_ptr);
nuclear@2 78 #else
nuclear@2 79 png_destroy_struct((png_voidp)png_ptr);
nuclear@2 80 #endif
nuclear@2 81 return (NULL);
nuclear@2 82 }
nuclear@2 83 #ifdef USE_FAR_KEYWORD
nuclear@2 84 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@2 85 #endif
nuclear@2 86 #endif
nuclear@2 87
nuclear@2 88 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 89 png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
nuclear@2 90 #endif
nuclear@2 91
nuclear@2 92 png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
nuclear@2 93
nuclear@2 94 if (user_png_ver)
nuclear@2 95 {
nuclear@2 96 i = 0;
nuclear@2 97 do
nuclear@2 98 {
nuclear@2 99 if (user_png_ver[i] != png_libpng_ver[i])
nuclear@2 100 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@2 101 } while (png_libpng_ver[i++]);
nuclear@2 102 }
nuclear@2 103 else
nuclear@2 104 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@2 105
nuclear@2 106
nuclear@2 107 if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
nuclear@2 108 {
nuclear@2 109 /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
nuclear@2 110 * we must recompile any applications that use any older library version.
nuclear@2 111 * For versions after libpng 1.0, we will be compatible, so we need
nuclear@2 112 * only check the first digit.
nuclear@2 113 */
nuclear@2 114 if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
nuclear@2 115 (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
nuclear@2 116 (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
nuclear@2 117 {
nuclear@2 118 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@2 119 char msg[80];
nuclear@2 120 if (user_png_ver)
nuclear@2 121 {
nuclear@2 122 png_snprintf(msg, 80,
nuclear@2 123 "Application was compiled with png.h from libpng-%.20s",
nuclear@2 124 user_png_ver);
nuclear@2 125 png_warning(png_ptr, msg);
nuclear@2 126 }
nuclear@2 127 png_snprintf(msg, 80,
nuclear@2 128 "Application is running with png.c from libpng-%.20s",
nuclear@2 129 png_libpng_ver);
nuclear@2 130 png_warning(png_ptr, msg);
nuclear@2 131 #endif
nuclear@2 132 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@2 133 png_ptr->flags = 0;
nuclear@2 134 #endif
nuclear@2 135 png_error(png_ptr,
nuclear@2 136 "Incompatible libpng version in application and library");
nuclear@2 137 }
nuclear@2 138 }
nuclear@2 139
nuclear@2 140 /* initialize zbuf - compression buffer */
nuclear@2 141 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@2 142 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@2 143 (png_uint_32)png_ptr->zbuf_size);
nuclear@2 144 png_ptr->zstream.zalloc = png_zalloc;
nuclear@2 145 png_ptr->zstream.zfree = png_zfree;
nuclear@2 146 png_ptr->zstream.opaque = (voidpf)png_ptr;
nuclear@2 147
nuclear@2 148 switch (inflateInit(&png_ptr->zstream))
nuclear@2 149 {
nuclear@2 150 case Z_OK: /* Do nothing */ break;
nuclear@2 151 case Z_MEM_ERROR:
nuclear@2 152 case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory error"); break;
nuclear@2 153 case Z_VERSION_ERROR: png_error(png_ptr, "zlib version error"); break;
nuclear@2 154 default: png_error(png_ptr, "Unknown zlib error");
nuclear@2 155 }
nuclear@2 156
nuclear@2 157 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@2 158 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@2 159
nuclear@2 160 png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
nuclear@2 161
nuclear@2 162 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 163 /* Applications that neglect to set up their own setjmp() and then encounter
nuclear@2 164 a png_error() will longjmp here. Since the jmpbuf is then meaningless we
nuclear@2 165 abort instead of returning. */
nuclear@2 166 #ifdef USE_FAR_KEYWORD
nuclear@2 167 if (setjmp(jmpbuf))
nuclear@2 168 PNG_ABORT();
nuclear@2 169 png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@2 170 #else
nuclear@2 171 if (setjmp(png_ptr->jmpbuf))
nuclear@2 172 PNG_ABORT();
nuclear@2 173 #endif
nuclear@2 174 #endif
nuclear@2 175 return (png_ptr);
nuclear@2 176 }
nuclear@2 177
nuclear@2 178 #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
nuclear@2 179 /* Initialize PNG structure for reading, and allocate any memory needed.
nuclear@2 180 This interface is deprecated in favour of the png_create_read_struct(),
nuclear@2 181 and it will disappear as of libpng-1.3.0. */
nuclear@2 182 #undef png_read_init
nuclear@2 183 void PNGAPI
nuclear@2 184 png_read_init(png_structp png_ptr)
nuclear@2 185 {
nuclear@2 186 /* We only come here via pre-1.0.7-compiled applications */
nuclear@2 187 png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
nuclear@2 188 }
nuclear@2 189
nuclear@2 190 void PNGAPI
nuclear@2 191 png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
nuclear@2 192 png_size_t png_struct_size, png_size_t png_info_size)
nuclear@2 193 {
nuclear@2 194 /* We only come here via pre-1.0.12-compiled applications */
nuclear@2 195 if (png_ptr == NULL) return;
nuclear@2 196 #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@2 197 if (png_sizeof(png_struct) > png_struct_size ||
nuclear@2 198 png_sizeof(png_info) > png_info_size)
nuclear@2 199 {
nuclear@2 200 char msg[80];
nuclear@2 201 png_ptr->warning_fn = NULL;
nuclear@2 202 if (user_png_ver)
nuclear@2 203 {
nuclear@2 204 png_snprintf(msg, 80,
nuclear@2 205 "Application was compiled with png.h from libpng-%.20s",
nuclear@2 206 user_png_ver);
nuclear@2 207 png_warning(png_ptr, msg);
nuclear@2 208 }
nuclear@2 209 png_snprintf(msg, 80,
nuclear@2 210 "Application is running with png.c from libpng-%.20s",
nuclear@2 211 png_libpng_ver);
nuclear@2 212 png_warning(png_ptr, msg);
nuclear@2 213 }
nuclear@2 214 #endif
nuclear@2 215 if (png_sizeof(png_struct) > png_struct_size)
nuclear@2 216 {
nuclear@2 217 png_ptr->error_fn = NULL;
nuclear@2 218 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@2 219 png_ptr->flags = 0;
nuclear@2 220 #endif
nuclear@2 221 png_error(png_ptr,
nuclear@2 222 "The png struct allocated by the application for reading is too small.");
nuclear@2 223 }
nuclear@2 224 if (png_sizeof(png_info) > png_info_size)
nuclear@2 225 {
nuclear@2 226 png_ptr->error_fn = NULL;
nuclear@2 227 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@2 228 png_ptr->flags = 0;
nuclear@2 229 #endif
nuclear@2 230 png_error(png_ptr,
nuclear@2 231 "The info struct allocated by application for reading is too small.");
nuclear@2 232 }
nuclear@2 233 png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
nuclear@2 234 }
nuclear@2 235 #endif /* PNG_1_0_X || PNG_1_2_X */
nuclear@2 236
nuclear@2 237 void PNGAPI
nuclear@2 238 png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
nuclear@2 239 png_size_t png_struct_size)
nuclear@2 240 {
nuclear@2 241 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 242 jmp_buf tmp_jmp; /* to save current jump buffer */
nuclear@2 243 #endif
nuclear@2 244
nuclear@2 245 int i = 0;
nuclear@2 246
nuclear@2 247 png_structp png_ptr=*ptr_ptr;
nuclear@2 248
nuclear@2 249 if (png_ptr == NULL) return;
nuclear@2 250
nuclear@2 251 do
nuclear@2 252 {
nuclear@2 253 if (user_png_ver[i] != png_libpng_ver[i])
nuclear@2 254 {
nuclear@2 255 #ifdef PNG_LEGACY_SUPPORTED
nuclear@2 256 png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@2 257 #else
nuclear@2 258 png_ptr->warning_fn = NULL;
nuclear@2 259 png_warning(png_ptr,
nuclear@2 260 "Application uses deprecated png_read_init() and should be recompiled.");
nuclear@2 261 break;
nuclear@2 262 #endif
nuclear@2 263 }
nuclear@2 264 } while (png_libpng_ver[i++]);
nuclear@2 265
nuclear@2 266 png_debug(1, "in png_read_init_3\n");
nuclear@2 267
nuclear@2 268 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 269 /* save jump buffer and error functions */
nuclear@2 270 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@2 271 #endif
nuclear@2 272
nuclear@2 273 if (png_sizeof(png_struct) > png_struct_size)
nuclear@2 274 {
nuclear@2 275 png_destroy_struct(png_ptr);
nuclear@2 276 *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@2 277 png_ptr = *ptr_ptr;
nuclear@2 278 }
nuclear@2 279
nuclear@2 280 /* reset all variables to 0 */
nuclear@2 281 png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@2 282
nuclear@2 283 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 284 /* restore jump buffer */
nuclear@2 285 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@2 286 #endif
nuclear@2 287
nuclear@2 288 /* added at libpng-1.2.6 */
nuclear@2 289 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@2 290 png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@2 291 png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@2 292 #endif
nuclear@2 293
nuclear@2 294 /* initialize zbuf - compression buffer */
nuclear@2 295 png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@2 296 png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@2 297 (png_uint_32)png_ptr->zbuf_size);
nuclear@2 298 png_ptr->zstream.zalloc = png_zalloc;
nuclear@2 299 png_ptr->zstream.zfree = png_zfree;
nuclear@2 300 png_ptr->zstream.opaque = (voidpf)png_ptr;
nuclear@2 301
nuclear@2 302 switch (inflateInit(&png_ptr->zstream))
nuclear@2 303 {
nuclear@2 304 case Z_OK: /* Do nothing */ break;
nuclear@2 305 case Z_MEM_ERROR:
nuclear@2 306 case Z_STREAM_ERROR: png_error(png_ptr, "zlib memory"); break;
nuclear@2 307 case Z_VERSION_ERROR: png_error(png_ptr, "zlib version"); break;
nuclear@2 308 default: png_error(png_ptr, "Unknown zlib error");
nuclear@2 309 }
nuclear@2 310
nuclear@2 311 png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@2 312 png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@2 313
nuclear@2 314 png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
nuclear@2 315 }
nuclear@2 316
nuclear@2 317 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@2 318 /* Read the information before the actual image data. This has been
nuclear@2 319 * changed in v0.90 to allow reading a file that already has the magic
nuclear@2 320 * bytes read from the stream. You can tell libpng how many bytes have
nuclear@2 321 * been read from the beginning of the stream (up to the maximum of 8)
nuclear@2 322 * via png_set_sig_bytes(), and we will only check the remaining bytes
nuclear@2 323 * here. The application can then have access to the signature bytes we
nuclear@2 324 * read if it is determined that this isn't a valid PNG file.
nuclear@2 325 */
nuclear@2 326 void PNGAPI
nuclear@2 327 png_read_info(png_structp png_ptr, png_infop info_ptr)
nuclear@2 328 {
nuclear@2 329 if (png_ptr == NULL || info_ptr == NULL) return;
nuclear@2 330 png_debug(1, "in png_read_info\n");
nuclear@2 331 /* If we haven't checked all of the PNG signature bytes, do so now. */
nuclear@2 332 if (png_ptr->sig_bytes < 8)
nuclear@2 333 {
nuclear@2 334 png_size_t num_checked = png_ptr->sig_bytes,
nuclear@2 335 num_to_check = 8 - num_checked;
nuclear@2 336
nuclear@2 337 png_read_data(png_ptr, &(info_ptr->signature[num_checked]), num_to_check);
nuclear@2 338 png_ptr->sig_bytes = 8;
nuclear@2 339
nuclear@2 340 if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
nuclear@2 341 {
nuclear@2 342 if (num_checked < 4 &&
nuclear@2 343 png_sig_cmp(info_ptr->signature, num_checked, num_to_check - 4))
nuclear@2 344 png_error(png_ptr, "Not a PNG file");
nuclear@2 345 else
nuclear@2 346 png_error(png_ptr, "PNG file corrupted by ASCII conversion");
nuclear@2 347 }
nuclear@2 348 if (num_checked < 3)
nuclear@2 349 png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
nuclear@2 350 }
nuclear@2 351
nuclear@2 352 for (;;)
nuclear@2 353 {
nuclear@2 354 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@2 355 PNG_CONST PNG_IHDR;
nuclear@2 356 PNG_CONST PNG_IDAT;
nuclear@2 357 PNG_CONST PNG_IEND;
nuclear@2 358 PNG_CONST PNG_PLTE;
nuclear@2 359 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@2 360 PNG_CONST PNG_bKGD;
nuclear@2 361 #endif
nuclear@2 362 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@2 363 PNG_CONST PNG_cHRM;
nuclear@2 364 #endif
nuclear@2 365 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@2 366 PNG_CONST PNG_gAMA;
nuclear@2 367 #endif
nuclear@2 368 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@2 369 PNG_CONST PNG_hIST;
nuclear@2 370 #endif
nuclear@2 371 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@2 372 PNG_CONST PNG_iCCP;
nuclear@2 373 #endif
nuclear@2 374 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@2 375 PNG_CONST PNG_iTXt;
nuclear@2 376 #endif
nuclear@2 377 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@2 378 PNG_CONST PNG_oFFs;
nuclear@2 379 #endif
nuclear@2 380 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@2 381 PNG_CONST PNG_pCAL;
nuclear@2 382 #endif
nuclear@2 383 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@2 384 PNG_CONST PNG_pHYs;
nuclear@2 385 #endif
nuclear@2 386 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@2 387 PNG_CONST PNG_sBIT;
nuclear@2 388 #endif
nuclear@2 389 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@2 390 PNG_CONST PNG_sCAL;
nuclear@2 391 #endif
nuclear@2 392 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@2 393 PNG_CONST PNG_sPLT;
nuclear@2 394 #endif
nuclear@2 395 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@2 396 PNG_CONST PNG_sRGB;
nuclear@2 397 #endif
nuclear@2 398 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@2 399 PNG_CONST PNG_tEXt;
nuclear@2 400 #endif
nuclear@2 401 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@2 402 PNG_CONST PNG_tIME;
nuclear@2 403 #endif
nuclear@2 404 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@2 405 PNG_CONST PNG_tRNS;
nuclear@2 406 #endif
nuclear@2 407 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@2 408 PNG_CONST PNG_zTXt;
nuclear@2 409 #endif
nuclear@2 410 #endif /* PNG_USE_LOCAL_ARRAYS */
nuclear@2 411 png_uint_32 length = png_read_chunk_header(png_ptr);
nuclear@2 412 PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
nuclear@2 413
nuclear@2 414 /* This should be a binary subdivision search or a hash for
nuclear@2 415 * matching the chunk name rather than a linear search.
nuclear@2 416 */
nuclear@2 417 if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@2 418 if (png_ptr->mode & PNG_AFTER_IDAT)
nuclear@2 419 png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;
nuclear@2 420
nuclear@2 421 if (!png_memcmp(chunk_name, png_IHDR, 4))
nuclear@2 422 png_handle_IHDR(png_ptr, info_ptr, length);
nuclear@2 423 else if (!png_memcmp(chunk_name, png_IEND, 4))
nuclear@2 424 png_handle_IEND(png_ptr, info_ptr, length);
nuclear@2 425 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@2 426 else if (png_handle_as_unknown(png_ptr, chunk_name))
nuclear@2 427 {
nuclear@2 428 if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@2 429 png_ptr->mode |= PNG_HAVE_IDAT;
nuclear@2 430 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@2 431 if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@2 432 png_ptr->mode |= PNG_HAVE_PLTE;
nuclear@2 433 else if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@2 434 {
nuclear@2 435 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@2 436 png_error(png_ptr, "Missing IHDR before IDAT");
nuclear@2 437 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@2 438 !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@2 439 png_error(png_ptr, "Missing PLTE before IDAT");
nuclear@2 440 break;
nuclear@2 441 }
nuclear@2 442 }
nuclear@2 443 #endif
nuclear@2 444 else if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@2 445 png_handle_PLTE(png_ptr, info_ptr, length);
nuclear@2 446 else if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@2 447 {
nuclear@2 448 if (!(png_ptr->mode & PNG_HAVE_IHDR))
nuclear@2 449 png_error(png_ptr, "Missing IHDR before IDAT");
nuclear@2 450 else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
nuclear@2 451 !(png_ptr->mode & PNG_HAVE_PLTE))
nuclear@2 452 png_error(png_ptr, "Missing PLTE before IDAT");
nuclear@2 453
nuclear@2 454 png_ptr->idat_size = length;
nuclear@2 455 png_ptr->mode |= PNG_HAVE_IDAT;
nuclear@2 456 break;
nuclear@2 457 }
nuclear@2 458 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@2 459 else if (!png_memcmp(chunk_name, png_bKGD, 4))
nuclear@2 460 png_handle_bKGD(png_ptr, info_ptr, length);
nuclear@2 461 #endif
nuclear@2 462 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@2 463 else if (!png_memcmp(chunk_name, png_cHRM, 4))
nuclear@2 464 png_handle_cHRM(png_ptr, info_ptr, length);
nuclear@2 465 #endif
nuclear@2 466 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@2 467 else if (!png_memcmp(chunk_name, png_gAMA, 4))
nuclear@2 468 png_handle_gAMA(png_ptr, info_ptr, length);
nuclear@2 469 #endif
nuclear@2 470 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@2 471 else if (!png_memcmp(chunk_name, png_hIST, 4))
nuclear@2 472 png_handle_hIST(png_ptr, info_ptr, length);
nuclear@2 473 #endif
nuclear@2 474 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@2 475 else if (!png_memcmp(chunk_name, png_oFFs, 4))
nuclear@2 476 png_handle_oFFs(png_ptr, info_ptr, length);
nuclear@2 477 #endif
nuclear@2 478 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@2 479 else if (!png_memcmp(chunk_name, png_pCAL, 4))
nuclear@2 480 png_handle_pCAL(png_ptr, info_ptr, length);
nuclear@2 481 #endif
nuclear@2 482 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@2 483 else if (!png_memcmp(chunk_name, png_sCAL, 4))
nuclear@2 484 png_handle_sCAL(png_ptr, info_ptr, length);
nuclear@2 485 #endif
nuclear@2 486 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@2 487 else if (!png_memcmp(chunk_name, png_pHYs, 4))
nuclear@2 488 png_handle_pHYs(png_ptr, info_ptr, length);
nuclear@2 489 #endif
nuclear@2 490 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@2 491 else if (!png_memcmp(chunk_name, png_sBIT, 4))
nuclear@2 492 png_handle_sBIT(png_ptr, info_ptr, length);
nuclear@2 493 #endif
nuclear@2 494 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@2 495 else if (!png_memcmp(chunk_name, png_sRGB, 4))
nuclear@2 496 png_handle_sRGB(png_ptr, info_ptr, length);
nuclear@2 497 #endif
nuclear@2 498 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@2 499 else if (!png_memcmp(chunk_name, png_iCCP, 4))
nuclear@2 500 png_handle_iCCP(png_ptr, info_ptr, length);
nuclear@2 501 #endif
nuclear@2 502 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@2 503 else if (!png_memcmp(chunk_name, png_sPLT, 4))
nuclear@2 504 png_handle_sPLT(png_ptr, info_ptr, length);
nuclear@2 505 #endif
nuclear@2 506 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@2 507 else if (!png_memcmp(chunk_name, png_tEXt, 4))
nuclear@2 508 png_handle_tEXt(png_ptr, info_ptr, length);
nuclear@2 509 #endif
nuclear@2 510 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@2 511 else if (!png_memcmp(chunk_name, png_tIME, 4))
nuclear@2 512 png_handle_tIME(png_ptr, info_ptr, length);
nuclear@2 513 #endif
nuclear@2 514 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@2 515 else if (!png_memcmp(chunk_name, png_tRNS, 4))
nuclear@2 516 png_handle_tRNS(png_ptr, info_ptr, length);
nuclear@2 517 #endif
nuclear@2 518 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@2 519 else if (!png_memcmp(chunk_name, png_zTXt, 4))
nuclear@2 520 png_handle_zTXt(png_ptr, info_ptr, length);
nuclear@2 521 #endif
nuclear@2 522 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@2 523 else if (!png_memcmp(chunk_name, png_iTXt, 4))
nuclear@2 524 png_handle_iTXt(png_ptr, info_ptr, length);
nuclear@2 525 #endif
nuclear@2 526 else
nuclear@2 527 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@2 528 }
nuclear@2 529 }
nuclear@2 530 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@2 531
nuclear@2 532 /* optional call to update the users info_ptr structure */
nuclear@2 533 void PNGAPI
nuclear@2 534 png_read_update_info(png_structp png_ptr, png_infop info_ptr)
nuclear@2 535 {
nuclear@2 536 png_debug(1, "in png_read_update_info\n");
nuclear@2 537 if (png_ptr == NULL) return;
nuclear@2 538 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
nuclear@2 539 png_read_start_row(png_ptr);
nuclear@2 540 else
nuclear@2 541 png_warning(png_ptr,
nuclear@2 542 "Ignoring extra png_read_update_info() call; row buffer not reallocated");
nuclear@2 543 png_read_transform_info(png_ptr, info_ptr);
nuclear@2 544 }
nuclear@2 545
nuclear@2 546 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@2 547 /* Initialize palette, background, etc, after transformations
nuclear@2 548 * are set, but before any reading takes place. This allows
nuclear@2 549 * the user to obtain a gamma-corrected palette, for example.
nuclear@2 550 * If the user doesn't call this, we will do it ourselves.
nuclear@2 551 */
nuclear@2 552 void PNGAPI
nuclear@2 553 png_start_read_image(png_structp png_ptr)
nuclear@2 554 {
nuclear@2 555 png_debug(1, "in png_start_read_image\n");
nuclear@2 556 if (png_ptr == NULL) return;
nuclear@2 557 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
nuclear@2 558 png_read_start_row(png_ptr);
nuclear@2 559 }
nuclear@2 560 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@2 561
nuclear@2 562 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@2 563 void PNGAPI
nuclear@2 564 png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
nuclear@2 565 {
nuclear@2 566 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@2 567 PNG_CONST PNG_IDAT;
nuclear@2 568 PNG_CONST int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55,
nuclear@2 569 0xff};
nuclear@2 570 PNG_CONST int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
nuclear@2 571 #endif
nuclear@2 572 int ret;
nuclear@2 573 if (png_ptr == NULL) return;
nuclear@2 574 png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
nuclear@2 575 png_ptr->row_number, png_ptr->pass);
nuclear@2 576 if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
nuclear@2 577 png_read_start_row(png_ptr);
nuclear@2 578 if (png_ptr->row_number == 0 && png_ptr->pass == 0)
nuclear@2 579 {
nuclear@2 580 /* check for transforms that have been set but were defined out */
nuclear@2 581 #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
nuclear@2 582 if (png_ptr->transformations & PNG_INVERT_MONO)
nuclear@2 583 png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
nuclear@2 584 #endif
nuclear@2 585 #if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)
nuclear@2 586 if (png_ptr->transformations & PNG_FILLER)
nuclear@2 587 png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined.");
nuclear@2 588 #endif
nuclear@2 589 #if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@2 590 if (png_ptr->transformations & PNG_PACKSWAP)
nuclear@2 591 png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined.");
nuclear@2 592 #endif
nuclear@2 593 #if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)
nuclear@2 594 if (png_ptr->transformations & PNG_PACK)
nuclear@2 595 png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined.");
nuclear@2 596 #endif
nuclear@2 597 #if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@2 598 if (png_ptr->transformations & PNG_SHIFT)
nuclear@2 599 png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined.");
nuclear@2 600 #endif
nuclear@2 601 #if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)
nuclear@2 602 if (png_ptr->transformations & PNG_BGR)
nuclear@2 603 png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined.");
nuclear@2 604 #endif
nuclear@2 605 #if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)
nuclear@2 606 if (png_ptr->transformations & PNG_SWAP_BYTES)
nuclear@2 607 png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined.");
nuclear@2 608 #endif
nuclear@2 609 }
nuclear@2 610
nuclear@2 611 #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@2 612 /* if interlaced and we do not need a new row, combine row and return */
nuclear@2 613 if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
nuclear@2 614 {
nuclear@2 615 switch (png_ptr->pass)
nuclear@2 616 {
nuclear@2 617 case 0:
nuclear@2 618 if (png_ptr->row_number & 0x07)
nuclear@2 619 {
nuclear@2 620 if (dsp_row != NULL)
nuclear@2 621 png_combine_row(png_ptr, dsp_row,
nuclear@2 622 png_pass_dsp_mask[png_ptr->pass]);
nuclear@2 623 png_read_finish_row(png_ptr);
nuclear@2 624 return;
nuclear@2 625 }
nuclear@2 626 break;
nuclear@2 627 case 1:
nuclear@2 628 if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
nuclear@2 629 {
nuclear@2 630 if (dsp_row != NULL)
nuclear@2 631 png_combine_row(png_ptr, dsp_row,
nuclear@2 632 png_pass_dsp_mask[png_ptr->pass]);
nuclear@2 633 png_read_finish_row(png_ptr);
nuclear@2 634 return;
nuclear@2 635 }
nuclear@2 636 break;
nuclear@2 637 case 2:
nuclear@2 638 if ((png_ptr->row_number & 0x07) != 4)
nuclear@2 639 {
nuclear@2 640 if (dsp_row != NULL && (png_ptr->row_number & 4))
nuclear@2 641 png_combine_row(png_ptr, dsp_row,
nuclear@2 642 png_pass_dsp_mask[png_ptr->pass]);
nuclear@2 643 png_read_finish_row(png_ptr);
nuclear@2 644 return;
nuclear@2 645 }
nuclear@2 646 break;
nuclear@2 647 case 3:
nuclear@2 648 if ((png_ptr->row_number & 3) || png_ptr->width < 3)
nuclear@2 649 {
nuclear@2 650 if (dsp_row != NULL)
nuclear@2 651 png_combine_row(png_ptr, dsp_row,
nuclear@2 652 png_pass_dsp_mask[png_ptr->pass]);
nuclear@2 653 png_read_finish_row(png_ptr);
nuclear@2 654 return;
nuclear@2 655 }
nuclear@2 656 break;
nuclear@2 657 case 4:
nuclear@2 658 if ((png_ptr->row_number & 3) != 2)
nuclear@2 659 {
nuclear@2 660 if (dsp_row != NULL && (png_ptr->row_number & 2))
nuclear@2 661 png_combine_row(png_ptr, dsp_row,
nuclear@2 662 png_pass_dsp_mask[png_ptr->pass]);
nuclear@2 663 png_read_finish_row(png_ptr);
nuclear@2 664 return;
nuclear@2 665 }
nuclear@2 666 break;
nuclear@2 667 case 5:
nuclear@2 668 if ((png_ptr->row_number & 1) || png_ptr->width < 2)
nuclear@2 669 {
nuclear@2 670 if (dsp_row != NULL)
nuclear@2 671 png_combine_row(png_ptr, dsp_row,
nuclear@2 672 png_pass_dsp_mask[png_ptr->pass]);
nuclear@2 673 png_read_finish_row(png_ptr);
nuclear@2 674 return;
nuclear@2 675 }
nuclear@2 676 break;
nuclear@2 677 case 6:
nuclear@2 678 if (!(png_ptr->row_number & 1))
nuclear@2 679 {
nuclear@2 680 png_read_finish_row(png_ptr);
nuclear@2 681 return;
nuclear@2 682 }
nuclear@2 683 break;
nuclear@2 684 }
nuclear@2 685 }
nuclear@2 686 #endif
nuclear@2 687
nuclear@2 688 if (!(png_ptr->mode & PNG_HAVE_IDAT))
nuclear@2 689 png_error(png_ptr, "Invalid attempt to read row data");
nuclear@2 690
nuclear@2 691 png_ptr->zstream.next_out = png_ptr->row_buf;
nuclear@2 692 png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
nuclear@2 693 do
nuclear@2 694 {
nuclear@2 695 if (!(png_ptr->zstream.avail_in))
nuclear@2 696 {
nuclear@2 697 while (!png_ptr->idat_size)
nuclear@2 698 {
nuclear@2 699 png_crc_finish(png_ptr, 0);
nuclear@2 700
nuclear@2 701 png_ptr->idat_size = png_read_chunk_header(png_ptr);
nuclear@2 702 if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
nuclear@2 703 png_error(png_ptr, "Not enough image data");
nuclear@2 704 }
nuclear@2 705 png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;
nuclear@2 706 png_ptr->zstream.next_in = png_ptr->zbuf;
nuclear@2 707 if (png_ptr->zbuf_size > png_ptr->idat_size)
nuclear@2 708 png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;
nuclear@2 709 png_crc_read(png_ptr, png_ptr->zbuf,
nuclear@2 710 (png_size_t)png_ptr->zstream.avail_in);
nuclear@2 711 png_ptr->idat_size -= png_ptr->zstream.avail_in;
nuclear@2 712 }
nuclear@2 713 ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
nuclear@2 714 if (ret == Z_STREAM_END)
nuclear@2 715 {
nuclear@2 716 if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in ||
nuclear@2 717 png_ptr->idat_size)
nuclear@2 718 png_error(png_ptr, "Extra compressed data");
nuclear@2 719 png_ptr->mode |= PNG_AFTER_IDAT;
nuclear@2 720 png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
nuclear@2 721 break;
nuclear@2 722 }
nuclear@2 723 if (ret != Z_OK)
nuclear@2 724 png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :
nuclear@2 725 "Decompression error");
nuclear@2 726
nuclear@2 727 } while (png_ptr->zstream.avail_out);
nuclear@2 728
nuclear@2 729 png_ptr->row_info.color_type = png_ptr->color_type;
nuclear@2 730 png_ptr->row_info.width = png_ptr->iwidth;
nuclear@2 731 png_ptr->row_info.channels = png_ptr->channels;
nuclear@2 732 png_ptr->row_info.bit_depth = png_ptr->bit_depth;
nuclear@2 733 png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
nuclear@2 734 png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
nuclear@2 735 png_ptr->row_info.width);
nuclear@2 736
nuclear@2 737 if (png_ptr->row_buf[0])
nuclear@2 738 png_read_filter_row(png_ptr, &(png_ptr->row_info),
nuclear@2 739 png_ptr->row_buf + 1, png_ptr->prev_row + 1,
nuclear@2 740 (int)(png_ptr->row_buf[0]));
nuclear@2 741
nuclear@2 742 png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
nuclear@2 743 png_ptr->rowbytes + 1);
nuclear@2 744
nuclear@2 745 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@2 746 if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
nuclear@2 747 (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
nuclear@2 748 {
nuclear@2 749 /* Intrapixel differencing */
nuclear@2 750 png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
nuclear@2 751 }
nuclear@2 752 #endif
nuclear@2 753
nuclear@2 754
nuclear@2 755 if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
nuclear@2 756 png_do_read_transformations(png_ptr);
nuclear@2 757
nuclear@2 758 #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@2 759 /* blow up interlaced rows to full size */
nuclear@2 760 if (png_ptr->interlaced &&
nuclear@2 761 (png_ptr->transformations & PNG_INTERLACE))
nuclear@2 762 {
nuclear@2 763 if (png_ptr->pass < 6)
nuclear@2 764 /* old interface (pre-1.0.9):
nuclear@2 765 png_do_read_interlace(&(png_ptr->row_info),
nuclear@2 766 png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
nuclear@2 767 */
nuclear@2 768 png_do_read_interlace(png_ptr);
nuclear@2 769
nuclear@2 770 if (dsp_row != NULL)
nuclear@2 771 png_combine_row(png_ptr, dsp_row,
nuclear@2 772 png_pass_dsp_mask[png_ptr->pass]);
nuclear@2 773 if (row != NULL)
nuclear@2 774 png_combine_row(png_ptr, row,
nuclear@2 775 png_pass_mask[png_ptr->pass]);
nuclear@2 776 }
nuclear@2 777 else
nuclear@2 778 #endif
nuclear@2 779 {
nuclear@2 780 if (row != NULL)
nuclear@2 781 png_combine_row(png_ptr, row, 0xff);
nuclear@2 782 if (dsp_row != NULL)
nuclear@2 783 png_combine_row(png_ptr, dsp_row, 0xff);
nuclear@2 784 }
nuclear@2 785 png_read_finish_row(png_ptr);
nuclear@2 786
nuclear@2 787 if (png_ptr->read_row_fn != NULL)
nuclear@2 788 (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
nuclear@2 789 }
nuclear@2 790 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@2 791
nuclear@2 792 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@2 793 /* Read one or more rows of image data. If the image is interlaced,
nuclear@2 794 * and png_set_interlace_handling() has been called, the rows need to
nuclear@2 795 * contain the contents of the rows from the previous pass. If the
nuclear@2 796 * image has alpha or transparency, and png_handle_alpha()[*] has been
nuclear@2 797 * called, the rows contents must be initialized to the contents of the
nuclear@2 798 * screen.
nuclear@2 799 *
nuclear@2 800 * "row" holds the actual image, and pixels are placed in it
nuclear@2 801 * as they arrive. If the image is displayed after each pass, it will
nuclear@2 802 * appear to "sparkle" in. "display_row" can be used to display a
nuclear@2 803 * "chunky" progressive image, with finer detail added as it becomes
nuclear@2 804 * available. If you do not want this "chunky" display, you may pass
nuclear@2 805 * NULL for display_row. If you do not want the sparkle display, and
nuclear@2 806 * you have not called png_handle_alpha(), you may pass NULL for rows.
nuclear@2 807 * If you have called png_handle_alpha(), and the image has either an
nuclear@2 808 * alpha channel or a transparency chunk, you must provide a buffer for
nuclear@2 809 * rows. In this case, you do not have to provide a display_row buffer
nuclear@2 810 * also, but you may. If the image is not interlaced, or if you have
nuclear@2 811 * not called png_set_interlace_handling(), the display_row buffer will
nuclear@2 812 * be ignored, so pass NULL to it.
nuclear@2 813 *
nuclear@2 814 * [*] png_handle_alpha() does not exist yet, as of this version of libpng
nuclear@2 815 */
nuclear@2 816
nuclear@2 817 void PNGAPI
nuclear@2 818 png_read_rows(png_structp png_ptr, png_bytepp row,
nuclear@2 819 png_bytepp display_row, png_uint_32 num_rows)
nuclear@2 820 {
nuclear@2 821 png_uint_32 i;
nuclear@2 822 png_bytepp rp;
nuclear@2 823 png_bytepp dp;
nuclear@2 824
nuclear@2 825 png_debug(1, "in png_read_rows\n");
nuclear@2 826 if (png_ptr == NULL) return;
nuclear@2 827 rp = row;
nuclear@2 828 dp = display_row;
nuclear@2 829 if (rp != NULL && dp != NULL)
nuclear@2 830 for (i = 0; i < num_rows; i++)
nuclear@2 831 {
nuclear@2 832 png_bytep rptr = *rp++;
nuclear@2 833 png_bytep dptr = *dp++;
nuclear@2 834
nuclear@2 835 png_read_row(png_ptr, rptr, dptr);
nuclear@2 836 }
nuclear@2 837 else if (rp != NULL)
nuclear@2 838 for (i = 0; i < num_rows; i++)
nuclear@2 839 {
nuclear@2 840 png_bytep rptr = *rp;
nuclear@2 841 png_read_row(png_ptr, rptr, png_bytep_NULL);
nuclear@2 842 rp++;
nuclear@2 843 }
nuclear@2 844 else if (dp != NULL)
nuclear@2 845 for (i = 0; i < num_rows; i++)
nuclear@2 846 {
nuclear@2 847 png_bytep dptr = *dp;
nuclear@2 848 png_read_row(png_ptr, png_bytep_NULL, dptr);
nuclear@2 849 dp++;
nuclear@2 850 }
nuclear@2 851 }
nuclear@2 852 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@2 853
nuclear@2 854 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@2 855 /* Read the entire image. If the image has an alpha channel or a tRNS
nuclear@2 856 * chunk, and you have called png_handle_alpha()[*], you will need to
nuclear@2 857 * initialize the image to the current image that PNG will be overlaying.
nuclear@2 858 * We set the num_rows again here, in case it was incorrectly set in
nuclear@2 859 * png_read_start_row() by a call to png_read_update_info() or
nuclear@2 860 * png_start_read_image() if png_set_interlace_handling() wasn't called
nuclear@2 861 * prior to either of these functions like it should have been. You can
nuclear@2 862 * only call this function once. If you desire to have an image for
nuclear@2 863 * each pass of a interlaced image, use png_read_rows() instead.
nuclear@2 864 *
nuclear@2 865 * [*] png_handle_alpha() does not exist yet, as of this version of libpng
nuclear@2 866 */
nuclear@2 867 void PNGAPI
nuclear@2 868 png_read_image(png_structp png_ptr, png_bytepp image)
nuclear@2 869 {
nuclear@2 870 png_uint_32 i, image_height;
nuclear@2 871 int pass, j;
nuclear@2 872 png_bytepp rp;
nuclear@2 873
nuclear@2 874 png_debug(1, "in png_read_image\n");
nuclear@2 875 if (png_ptr == NULL) return;
nuclear@2 876
nuclear@2 877 #ifdef PNG_READ_INTERLACING_SUPPORTED
nuclear@2 878 pass = png_set_interlace_handling(png_ptr);
nuclear@2 879 #else
nuclear@2 880 if (png_ptr->interlaced)
nuclear@2 881 png_error(png_ptr,
nuclear@2 882 "Cannot read interlaced image -- interlace handler disabled.");
nuclear@2 883 pass = 1;
nuclear@2 884 #endif
nuclear@2 885
nuclear@2 886
nuclear@2 887 image_height=png_ptr->height;
nuclear@2 888 png_ptr->num_rows = image_height; /* Make sure this is set correctly */
nuclear@2 889
nuclear@2 890 for (j = 0; j < pass; j++)
nuclear@2 891 {
nuclear@2 892 rp = image;
nuclear@2 893 for (i = 0; i < image_height; i++)
nuclear@2 894 {
nuclear@2 895 png_read_row(png_ptr, *rp, png_bytep_NULL);
nuclear@2 896 rp++;
nuclear@2 897 }
nuclear@2 898 }
nuclear@2 899 }
nuclear@2 900 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@2 901
nuclear@2 902 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@2 903 /* Read the end of the PNG file. Will not read past the end of the
nuclear@2 904 * file, will verify the end is accurate, and will read any comments
nuclear@2 905 * or time information at the end of the file, if info is not NULL.
nuclear@2 906 */
nuclear@2 907 void PNGAPI
nuclear@2 908 png_read_end(png_structp png_ptr, png_infop info_ptr)
nuclear@2 909 {
nuclear@2 910 png_debug(1, "in png_read_end\n");
nuclear@2 911 if (png_ptr == NULL) return;
nuclear@2 912 png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
nuclear@2 913
nuclear@2 914 do
nuclear@2 915 {
nuclear@2 916 #ifdef PNG_USE_LOCAL_ARRAYS
nuclear@2 917 PNG_CONST PNG_IHDR;
nuclear@2 918 PNG_CONST PNG_IDAT;
nuclear@2 919 PNG_CONST PNG_IEND;
nuclear@2 920 PNG_CONST PNG_PLTE;
nuclear@2 921 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@2 922 PNG_CONST PNG_bKGD;
nuclear@2 923 #endif
nuclear@2 924 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@2 925 PNG_CONST PNG_cHRM;
nuclear@2 926 #endif
nuclear@2 927 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@2 928 PNG_CONST PNG_gAMA;
nuclear@2 929 #endif
nuclear@2 930 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@2 931 PNG_CONST PNG_hIST;
nuclear@2 932 #endif
nuclear@2 933 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@2 934 PNG_CONST PNG_iCCP;
nuclear@2 935 #endif
nuclear@2 936 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@2 937 PNG_CONST PNG_iTXt;
nuclear@2 938 #endif
nuclear@2 939 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@2 940 PNG_CONST PNG_oFFs;
nuclear@2 941 #endif
nuclear@2 942 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@2 943 PNG_CONST PNG_pCAL;
nuclear@2 944 #endif
nuclear@2 945 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@2 946 PNG_CONST PNG_pHYs;
nuclear@2 947 #endif
nuclear@2 948 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@2 949 PNG_CONST PNG_sBIT;
nuclear@2 950 #endif
nuclear@2 951 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@2 952 PNG_CONST PNG_sCAL;
nuclear@2 953 #endif
nuclear@2 954 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@2 955 PNG_CONST PNG_sPLT;
nuclear@2 956 #endif
nuclear@2 957 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@2 958 PNG_CONST PNG_sRGB;
nuclear@2 959 #endif
nuclear@2 960 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@2 961 PNG_CONST PNG_tEXt;
nuclear@2 962 #endif
nuclear@2 963 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@2 964 PNG_CONST PNG_tIME;
nuclear@2 965 #endif
nuclear@2 966 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@2 967 PNG_CONST PNG_tRNS;
nuclear@2 968 #endif
nuclear@2 969 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@2 970 PNG_CONST PNG_zTXt;
nuclear@2 971 #endif
nuclear@2 972 #endif /* PNG_USE_LOCAL_ARRAYS */
nuclear@2 973 png_uint_32 length = png_read_chunk_header(png_ptr);
nuclear@2 974 PNG_CONST png_bytep chunk_name = png_ptr->chunk_name;
nuclear@2 975
nuclear@2 976 if (!png_memcmp(chunk_name, png_IHDR, 4))
nuclear@2 977 png_handle_IHDR(png_ptr, info_ptr, length);
nuclear@2 978 else if (!png_memcmp(chunk_name, png_IEND, 4))
nuclear@2 979 png_handle_IEND(png_ptr, info_ptr, length);
nuclear@2 980 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@2 981 else if (png_handle_as_unknown(png_ptr, chunk_name))
nuclear@2 982 {
nuclear@2 983 if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@2 984 {
nuclear@2 985 if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
nuclear@2 986 png_error(png_ptr, "Too many IDAT's found");
nuclear@2 987 }
nuclear@2 988 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@2 989 if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@2 990 png_ptr->mode |= PNG_HAVE_PLTE;
nuclear@2 991 }
nuclear@2 992 #endif
nuclear@2 993 else if (!png_memcmp(chunk_name, png_IDAT, 4))
nuclear@2 994 {
nuclear@2 995 /* Zero length IDATs are legal after the last IDAT has been
nuclear@2 996 * read, but not after other chunks have been read.
nuclear@2 997 */
nuclear@2 998 if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
nuclear@2 999 png_error(png_ptr, "Too many IDAT's found");
nuclear@2 1000 png_crc_finish(png_ptr, length);
nuclear@2 1001 }
nuclear@2 1002 else if (!png_memcmp(chunk_name, png_PLTE, 4))
nuclear@2 1003 png_handle_PLTE(png_ptr, info_ptr, length);
nuclear@2 1004 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@2 1005 else if (!png_memcmp(chunk_name, png_bKGD, 4))
nuclear@2 1006 png_handle_bKGD(png_ptr, info_ptr, length);
nuclear@2 1007 #endif
nuclear@2 1008 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@2 1009 else if (!png_memcmp(chunk_name, png_cHRM, 4))
nuclear@2 1010 png_handle_cHRM(png_ptr, info_ptr, length);
nuclear@2 1011 #endif
nuclear@2 1012 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@2 1013 else if (!png_memcmp(chunk_name, png_gAMA, 4))
nuclear@2 1014 png_handle_gAMA(png_ptr, info_ptr, length);
nuclear@2 1015 #endif
nuclear@2 1016 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@2 1017 else if (!png_memcmp(chunk_name, png_hIST, 4))
nuclear@2 1018 png_handle_hIST(png_ptr, info_ptr, length);
nuclear@2 1019 #endif
nuclear@2 1020 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@2 1021 else if (!png_memcmp(chunk_name, png_oFFs, 4))
nuclear@2 1022 png_handle_oFFs(png_ptr, info_ptr, length);
nuclear@2 1023 #endif
nuclear@2 1024 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@2 1025 else if (!png_memcmp(chunk_name, png_pCAL, 4))
nuclear@2 1026 png_handle_pCAL(png_ptr, info_ptr, length);
nuclear@2 1027 #endif
nuclear@2 1028 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@2 1029 else if (!png_memcmp(chunk_name, png_sCAL, 4))
nuclear@2 1030 png_handle_sCAL(png_ptr, info_ptr, length);
nuclear@2 1031 #endif
nuclear@2 1032 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@2 1033 else if (!png_memcmp(chunk_name, png_pHYs, 4))
nuclear@2 1034 png_handle_pHYs(png_ptr, info_ptr, length);
nuclear@2 1035 #endif
nuclear@2 1036 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@2 1037 else if (!png_memcmp(chunk_name, png_sBIT, 4))
nuclear@2 1038 png_handle_sBIT(png_ptr, info_ptr, length);
nuclear@2 1039 #endif
nuclear@2 1040 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@2 1041 else if (!png_memcmp(chunk_name, png_sRGB, 4))
nuclear@2 1042 png_handle_sRGB(png_ptr, info_ptr, length);
nuclear@2 1043 #endif
nuclear@2 1044 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@2 1045 else if (!png_memcmp(chunk_name, png_iCCP, 4))
nuclear@2 1046 png_handle_iCCP(png_ptr, info_ptr, length);
nuclear@2 1047 #endif
nuclear@2 1048 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@2 1049 else if (!png_memcmp(chunk_name, png_sPLT, 4))
nuclear@2 1050 png_handle_sPLT(png_ptr, info_ptr, length);
nuclear@2 1051 #endif
nuclear@2 1052 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@2 1053 else if (!png_memcmp(chunk_name, png_tEXt, 4))
nuclear@2 1054 png_handle_tEXt(png_ptr, info_ptr, length);
nuclear@2 1055 #endif
nuclear@2 1056 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@2 1057 else if (!png_memcmp(chunk_name, png_tIME, 4))
nuclear@2 1058 png_handle_tIME(png_ptr, info_ptr, length);
nuclear@2 1059 #endif
nuclear@2 1060 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@2 1061 else if (!png_memcmp(chunk_name, png_tRNS, 4))
nuclear@2 1062 png_handle_tRNS(png_ptr, info_ptr, length);
nuclear@2 1063 #endif
nuclear@2 1064 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@2 1065 else if (!png_memcmp(chunk_name, png_zTXt, 4))
nuclear@2 1066 png_handle_zTXt(png_ptr, info_ptr, length);
nuclear@2 1067 #endif
nuclear@2 1068 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@2 1069 else if (!png_memcmp(chunk_name, png_iTXt, 4))
nuclear@2 1070 png_handle_iTXt(png_ptr, info_ptr, length);
nuclear@2 1071 #endif
nuclear@2 1072 else
nuclear@2 1073 png_handle_unknown(png_ptr, info_ptr, length);
nuclear@2 1074 } while (!(png_ptr->mode & PNG_HAVE_IEND));
nuclear@2 1075 }
nuclear@2 1076 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@2 1077
nuclear@2 1078 /* free all memory used by the read */
nuclear@2 1079 void PNGAPI
nuclear@2 1080 png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
nuclear@2 1081 png_infopp end_info_ptr_ptr)
nuclear@2 1082 {
nuclear@2 1083 png_structp png_ptr = NULL;
nuclear@2 1084 png_infop info_ptr = NULL, end_info_ptr = NULL;
nuclear@2 1085 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1086 png_free_ptr free_fn = NULL;
nuclear@2 1087 png_voidp mem_ptr = NULL;
nuclear@2 1088 #endif
nuclear@2 1089
nuclear@2 1090 png_debug(1, "in png_destroy_read_struct\n");
nuclear@2 1091 if (png_ptr_ptr != NULL)
nuclear@2 1092 png_ptr = *png_ptr_ptr;
nuclear@2 1093 if (png_ptr == NULL)
nuclear@2 1094 return;
nuclear@2 1095
nuclear@2 1096 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1097 free_fn = png_ptr->free_fn;
nuclear@2 1098 mem_ptr = png_ptr->mem_ptr;
nuclear@2 1099 #endif
nuclear@2 1100
nuclear@2 1101 if (info_ptr_ptr != NULL)
nuclear@2 1102 info_ptr = *info_ptr_ptr;
nuclear@2 1103
nuclear@2 1104 if (end_info_ptr_ptr != NULL)
nuclear@2 1105 end_info_ptr = *end_info_ptr_ptr;
nuclear@2 1106
nuclear@2 1107 png_read_destroy(png_ptr, info_ptr, end_info_ptr);
nuclear@2 1108
nuclear@2 1109 if (info_ptr != NULL)
nuclear@2 1110 {
nuclear@2 1111 #if defined(PNG_TEXT_SUPPORTED)
nuclear@2 1112 png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);
nuclear@2 1113 #endif
nuclear@2 1114
nuclear@2 1115 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1116 png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
nuclear@2 1117 (png_voidp)mem_ptr);
nuclear@2 1118 #else
nuclear@2 1119 png_destroy_struct((png_voidp)info_ptr);
nuclear@2 1120 #endif
nuclear@2 1121 *info_ptr_ptr = NULL;
nuclear@2 1122 }
nuclear@2 1123
nuclear@2 1124 if (end_info_ptr != NULL)
nuclear@2 1125 {
nuclear@2 1126 #if defined(PNG_READ_TEXT_SUPPORTED)
nuclear@2 1127 png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
nuclear@2 1128 #endif
nuclear@2 1129 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1130 png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn,
nuclear@2 1131 (png_voidp)mem_ptr);
nuclear@2 1132 #else
nuclear@2 1133 png_destroy_struct((png_voidp)end_info_ptr);
nuclear@2 1134 #endif
nuclear@2 1135 *end_info_ptr_ptr = NULL;
nuclear@2 1136 }
nuclear@2 1137
nuclear@2 1138 if (png_ptr != NULL)
nuclear@2 1139 {
nuclear@2 1140 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1141 png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
nuclear@2 1142 (png_voidp)mem_ptr);
nuclear@2 1143 #else
nuclear@2 1144 png_destroy_struct((png_voidp)png_ptr);
nuclear@2 1145 #endif
nuclear@2 1146 *png_ptr_ptr = NULL;
nuclear@2 1147 }
nuclear@2 1148 }
nuclear@2 1149
nuclear@2 1150 /* free all memory used by the read (old method) */
nuclear@2 1151 void /* PRIVATE */
nuclear@2 1152 png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
nuclear@2 1153 {
nuclear@2 1154 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 1155 jmp_buf tmp_jmp;
nuclear@2 1156 #endif
nuclear@2 1157 png_error_ptr error_fn;
nuclear@2 1158 png_error_ptr warning_fn;
nuclear@2 1159 png_voidp error_ptr;
nuclear@2 1160 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1161 png_free_ptr free_fn;
nuclear@2 1162 #endif
nuclear@2 1163
nuclear@2 1164 png_debug(1, "in png_read_destroy\n");
nuclear@2 1165 if (info_ptr != NULL)
nuclear@2 1166 png_info_destroy(png_ptr, info_ptr);
nuclear@2 1167
nuclear@2 1168 if (end_info_ptr != NULL)
nuclear@2 1169 png_info_destroy(png_ptr, end_info_ptr);
nuclear@2 1170
nuclear@2 1171 png_free(png_ptr, png_ptr->zbuf);
nuclear@2 1172 png_free(png_ptr, png_ptr->big_row_buf);
nuclear@2 1173 png_free(png_ptr, png_ptr->prev_row);
nuclear@2 1174 png_free(png_ptr, png_ptr->chunkdata);
nuclear@2 1175 #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@2 1176 png_free(png_ptr, png_ptr->palette_lookup);
nuclear@2 1177 png_free(png_ptr, png_ptr->dither_index);
nuclear@2 1178 #endif
nuclear@2 1179 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@2 1180 png_free(png_ptr, png_ptr->gamma_table);
nuclear@2 1181 #endif
nuclear@2 1182 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@2 1183 png_free(png_ptr, png_ptr->gamma_from_1);
nuclear@2 1184 png_free(png_ptr, png_ptr->gamma_to_1);
nuclear@2 1185 #endif
nuclear@2 1186 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@2 1187 if (png_ptr->free_me & PNG_FREE_PLTE)
nuclear@2 1188 png_zfree(png_ptr, png_ptr->palette);
nuclear@2 1189 png_ptr->free_me &= ~PNG_FREE_PLTE;
nuclear@2 1190 #else
nuclear@2 1191 if (png_ptr->flags & PNG_FLAG_FREE_PLTE)
nuclear@2 1192 png_zfree(png_ptr, png_ptr->palette);
nuclear@2 1193 png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
nuclear@2 1194 #endif
nuclear@2 1195 #if defined(PNG_tRNS_SUPPORTED) || \
nuclear@2 1196 defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@2 1197 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@2 1198 if (png_ptr->free_me & PNG_FREE_TRNS)
nuclear@2 1199 png_free(png_ptr, png_ptr->trans);
nuclear@2 1200 png_ptr->free_me &= ~PNG_FREE_TRNS;
nuclear@2 1201 #else
nuclear@2 1202 if (png_ptr->flags & PNG_FLAG_FREE_TRNS)
nuclear@2 1203 png_free(png_ptr, png_ptr->trans);
nuclear@2 1204 png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
nuclear@2 1205 #endif
nuclear@2 1206 #endif
nuclear@2 1207 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@2 1208 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@2 1209 if (png_ptr->free_me & PNG_FREE_HIST)
nuclear@2 1210 png_free(png_ptr, png_ptr->hist);
nuclear@2 1211 png_ptr->free_me &= ~PNG_FREE_HIST;
nuclear@2 1212 #else
nuclear@2 1213 if (png_ptr->flags & PNG_FLAG_FREE_HIST)
nuclear@2 1214 png_free(png_ptr, png_ptr->hist);
nuclear@2 1215 png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
nuclear@2 1216 #endif
nuclear@2 1217 #endif
nuclear@2 1218 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@2 1219 if (png_ptr->gamma_16_table != NULL)
nuclear@2 1220 {
nuclear@2 1221 int i;
nuclear@2 1222 int istop = (1 << (8 - png_ptr->gamma_shift));
nuclear@2 1223 for (i = 0; i < istop; i++)
nuclear@2 1224 {
nuclear@2 1225 png_free(png_ptr, png_ptr->gamma_16_table[i]);
nuclear@2 1226 }
nuclear@2 1227 png_free(png_ptr, png_ptr->gamma_16_table);
nuclear@2 1228 }
nuclear@2 1229 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@2 1230 if (png_ptr->gamma_16_from_1 != NULL)
nuclear@2 1231 {
nuclear@2 1232 int i;
nuclear@2 1233 int istop = (1 << (8 - png_ptr->gamma_shift));
nuclear@2 1234 for (i = 0; i < istop; i++)
nuclear@2 1235 {
nuclear@2 1236 png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
nuclear@2 1237 }
nuclear@2 1238 png_free(png_ptr, png_ptr->gamma_16_from_1);
nuclear@2 1239 }
nuclear@2 1240 if (png_ptr->gamma_16_to_1 != NULL)
nuclear@2 1241 {
nuclear@2 1242 int i;
nuclear@2 1243 int istop = (1 << (8 - png_ptr->gamma_shift));
nuclear@2 1244 for (i = 0; i < istop; i++)
nuclear@2 1245 {
nuclear@2 1246 png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
nuclear@2 1247 }
nuclear@2 1248 png_free(png_ptr, png_ptr->gamma_16_to_1);
nuclear@2 1249 }
nuclear@2 1250 #endif
nuclear@2 1251 #endif
nuclear@2 1252 #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@2 1253 png_free(png_ptr, png_ptr->time_buffer);
nuclear@2 1254 #endif
nuclear@2 1255
nuclear@2 1256 inflateEnd(&png_ptr->zstream);
nuclear@2 1257 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@2 1258 png_free(png_ptr, png_ptr->save_buffer);
nuclear@2 1259 #endif
nuclear@2 1260
nuclear@2 1261 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@2 1262 #ifdef PNG_TEXT_SUPPORTED
nuclear@2 1263 png_free(png_ptr, png_ptr->current_text);
nuclear@2 1264 #endif /* PNG_TEXT_SUPPORTED */
nuclear@2 1265 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
nuclear@2 1266
nuclear@2 1267 /* Save the important info out of the png_struct, in case it is
nuclear@2 1268 * being used again.
nuclear@2 1269 */
nuclear@2 1270 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 1271 png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@2 1272 #endif
nuclear@2 1273
nuclear@2 1274 error_fn = png_ptr->error_fn;
nuclear@2 1275 warning_fn = png_ptr->warning_fn;
nuclear@2 1276 error_ptr = png_ptr->error_ptr;
nuclear@2 1277 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1278 free_fn = png_ptr->free_fn;
nuclear@2 1279 #endif
nuclear@2 1280
nuclear@2 1281 png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@2 1282
nuclear@2 1283 png_ptr->error_fn = error_fn;
nuclear@2 1284 png_ptr->warning_fn = warning_fn;
nuclear@2 1285 png_ptr->error_ptr = error_ptr;
nuclear@2 1286 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@2 1287 png_ptr->free_fn = free_fn;
nuclear@2 1288 #endif
nuclear@2 1289
nuclear@2 1290 #ifdef PNG_SETJMP_SUPPORTED
nuclear@2 1291 png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@2 1292 #endif
nuclear@2 1293
nuclear@2 1294 }
nuclear@2 1295
nuclear@2 1296 void PNGAPI
nuclear@2 1297 png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
nuclear@2 1298 {
nuclear@2 1299 if (png_ptr == NULL) return;
nuclear@2 1300 png_ptr->read_row_fn = read_row_fn;
nuclear@2 1301 }
nuclear@2 1302
nuclear@2 1303
nuclear@2 1304 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@2 1305 #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@2 1306 void PNGAPI
nuclear@2 1307 png_read_png(png_structp png_ptr, png_infop info_ptr,
nuclear@2 1308 int transforms,
nuclear@2 1309 voidp params)
nuclear@2 1310 {
nuclear@2 1311 int row;
nuclear@2 1312
nuclear@2 1313 if (png_ptr == NULL) return;
nuclear@2 1314 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
nuclear@2 1315 /* invert the alpha channel from opacity to transparency
nuclear@2 1316 */
nuclear@2 1317 if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
nuclear@2 1318 png_set_invert_alpha(png_ptr);
nuclear@2 1319 #endif
nuclear@2 1320
nuclear@2 1321 /* png_read_info() gives us all of the information from the
nuclear@2 1322 * PNG file before the first IDAT (image data chunk).
nuclear@2 1323 */
nuclear@2 1324 png_read_info(png_ptr, info_ptr);
nuclear@2 1325 if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
nuclear@2 1326 png_error(png_ptr, "Image is too high to process with png_read_png()");
nuclear@2 1327
nuclear@2 1328 /* -------------- image transformations start here ------------------- */
nuclear@2 1329
nuclear@2 1330 #if defined(PNG_READ_16_TO_8_SUPPORTED)
nuclear@2 1331 /* tell libpng to strip 16 bit/color files down to 8 bits per color
nuclear@2 1332 */
nuclear@2 1333 if (transforms & PNG_TRANSFORM_STRIP_16)
nuclear@2 1334 png_set_strip_16(png_ptr);
nuclear@2 1335 #endif
nuclear@2 1336
nuclear@2 1337 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
nuclear@2 1338 /* Strip alpha bytes from the input data without combining with
nuclear@2 1339 * the background (not recommended).
nuclear@2 1340 */
nuclear@2 1341 if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
nuclear@2 1342 png_set_strip_alpha(png_ptr);
nuclear@2 1343 #endif
nuclear@2 1344
nuclear@2 1345 #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@2 1346 /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single
nuclear@2 1347 * byte into separate bytes (useful for paletted and grayscale images).
nuclear@2 1348 */
nuclear@2 1349 if (transforms & PNG_TRANSFORM_PACKING)
nuclear@2 1350 png_set_packing(png_ptr);
nuclear@2 1351 #endif
nuclear@2 1352
nuclear@2 1353 #if defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@2 1354 /* Change the order of packed pixels to least significant bit first
nuclear@2 1355 * (not useful if you are using png_set_packing).
nuclear@2 1356 */
nuclear@2 1357 if (transforms & PNG_TRANSFORM_PACKSWAP)
nuclear@2 1358 png_set_packswap(png_ptr);
nuclear@2 1359 #endif
nuclear@2 1360
nuclear@2 1361 #if defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@2 1362 /* Expand paletted colors into true RGB triplets
nuclear@2 1363 * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
nuclear@2 1364 * Expand paletted or RGB images with transparency to full alpha
nuclear@2 1365 * channels so the data will be available as RGBA quartets.
nuclear@2 1366 */
nuclear@2 1367 if (transforms & PNG_TRANSFORM_EXPAND)
nuclear@2 1368 if ((png_ptr->bit_depth < 8) ||
nuclear@2 1369 (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
nuclear@2 1370 (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
nuclear@2 1371 png_set_expand(png_ptr);
nuclear@2 1372 #endif
nuclear@2 1373
nuclear@2 1374 /* We don't handle background color or gamma transformation or dithering.
nuclear@2 1375 */
nuclear@2 1376
nuclear@2 1377 #if defined(PNG_READ_INVERT_SUPPORTED)
nuclear@2 1378 /* invert monochrome files to have 0 as white and 1 as black
nuclear@2 1379 */
nuclear@2 1380 if (transforms & PNG_TRANSFORM_INVERT_MONO)
nuclear@2 1381 png_set_invert_mono(png_ptr);
nuclear@2 1382 #endif
nuclear@2 1383
nuclear@2 1384 #if defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@2 1385 /* If you want to shift the pixel values from the range [0,255] or
nuclear@2 1386 * [0,65535] to the original [0,7] or [0,31], or whatever range the
nuclear@2 1387 * colors were originally in:
nuclear@2 1388 */
nuclear@2 1389 if ((transforms & PNG_TRANSFORM_SHIFT)
nuclear@2 1390 && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
nuclear@2 1391 {
nuclear@2 1392 png_color_8p sig_bit;
nuclear@2 1393
nuclear@2 1394 png_get_sBIT(png_ptr, info_ptr, &sig_bit);
nuclear@2 1395 png_set_shift(png_ptr, sig_bit);
nuclear@2 1396 }
nuclear@2 1397 #endif
nuclear@2 1398
nuclear@2 1399 #if defined(PNG_READ_BGR_SUPPORTED)
nuclear@2 1400 /* flip the RGB pixels to BGR (or RGBA to BGRA)
nuclear@2 1401 */
nuclear@2 1402 if (transforms & PNG_TRANSFORM_BGR)
nuclear@2 1403 png_set_bgr(png_ptr);
nuclear@2 1404 #endif
nuclear@2 1405
nuclear@2 1406 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
nuclear@2 1407 /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR)
nuclear@2 1408 */
nuclear@2 1409 if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
nuclear@2 1410 png_set_swap_alpha(png_ptr);
nuclear@2 1411 #endif
nuclear@2 1412
nuclear@2 1413 #if defined(PNG_READ_SWAP_SUPPORTED)
nuclear@2 1414 /* swap bytes of 16 bit files to least significant byte first
nuclear@2 1415 */
nuclear@2 1416 if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
nuclear@2 1417 png_set_swap(png_ptr);
nuclear@2 1418 #endif
nuclear@2 1419
nuclear@2 1420 /* We don't handle adding filler bytes */
nuclear@2 1421
nuclear@2 1422 /* Optional call to gamma correct and add the background to the palette
nuclear@2 1423 * and update info structure. REQUIRED if you are expecting libpng to
nuclear@2 1424 * update the palette for you (i.e., you selected such a transform above).
nuclear@2 1425 */
nuclear@2 1426 png_read_update_info(png_ptr, info_ptr);
nuclear@2 1427
nuclear@2 1428 /* -------------- image transformations end here ------------------- */
nuclear@2 1429
nuclear@2 1430 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@2 1431 png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
nuclear@2 1432 #endif
nuclear@2 1433 if (info_ptr->row_pointers == NULL)
nuclear@2 1434 {
nuclear@2 1435 info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
nuclear@2 1436 info_ptr->height * png_sizeof(png_bytep));
nuclear@2 1437 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@2 1438 info_ptr->free_me |= PNG_FREE_ROWS;
nuclear@2 1439 #endif
nuclear@2 1440 for (row = 0; row < (int)info_ptr->height; row++)
nuclear@2 1441 {
nuclear@2 1442 info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
nuclear@2 1443 png_get_rowbytes(png_ptr, info_ptr));
nuclear@2 1444 }
nuclear@2 1445 }
nuclear@2 1446
nuclear@2 1447 png_read_image(png_ptr, info_ptr->row_pointers);
nuclear@2 1448 info_ptr->valid |= PNG_INFO_IDAT;
nuclear@2 1449
nuclear@2 1450 /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
nuclear@2 1451 png_read_end(png_ptr, info_ptr);
nuclear@2 1452
nuclear@2 1453 transforms = transforms; /* quiet compiler warnings */
nuclear@2 1454 params = params;
nuclear@2 1455
nuclear@2 1456 }
nuclear@2 1457 #endif /* PNG_INFO_IMAGE_SUPPORTED */
nuclear@2 1458 #endif /* PNG_NO_SEQUENTIAL_READ_SUPPORTED */
nuclear@2 1459 #endif /* PNG_READ_SUPPORTED */