| 1 | ␍␊ |
| 2 | /* pngread.c - read a PNG file␍␊ |
| 3 | *␍␊ |
| 4 | * Last changed in libpng 1.5.10 [March 8, 2012]␍␊ |
| 5 | * Copyright (c) 1998-2012 Glenn Randers-Pehrson␍␊ |
| 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)␍␊ |
| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)␍␊ |
| 8 | *␍␊ |
| 9 | * This code is released under the libpng license.␍␊ |
| 10 | * For conditions of distribution and use, see the disclaimer␍␊ |
| 11 | * and license in png.h␍␊ |
| 12 | *␍␊ |
| 13 | * This file contains routines that an application calls directly to␍␊ |
| 14 | * read a PNG file or stream.␍␊ |
| 15 | */␍␊ |
| 16 | ␍␊ |
| 17 | #include "pngpriv.h"␍␊ |
| 18 | ␍␊ |
| 19 | #ifdef PNG_READ_SUPPORTED␍␊ |
| 20 | ␍␊ |
| 21 | /* Create a PNG structure for reading, and allocate any memory needed. */␍␊ |
| 22 | PNG_FUNCTION(png_structp,PNGAPI␍␊ |
| 23 | png_create_read_struct,(png_const_charp user_png_ver, png_voidp error_ptr,␍␊ |
| 24 | png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED)␍␊ |
| 25 | {␍␊ |
| 26 | ␍␊ |
| 27 | #ifdef PNG_USER_MEM_SUPPORTED␍␊ |
| 28 | return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,␍␊ |
| 29 | warn_fn, NULL, NULL, NULL));␍␊ |
| 30 | }␍␊ |
| 31 | ␍␊ |
| 32 | /* Alternate create PNG structure for reading, and allocate any memory␍␊ |
| 33 | * needed.␍␊ |
| 34 | */␍␊ |
| 35 | PNG_FUNCTION(png_structp,PNGAPI␍␊ |
| 36 | png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr,␍␊ |
| 37 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,␍␊ |
| 38 | png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED)␍␊ |
| 39 | {␍␊ |
| 40 | #endif /* PNG_USER_MEM_SUPPORTED */␍␊ |
| 41 | ␍␊ |
| 42 | #ifdef PNG_SETJMP_SUPPORTED␍␊ |
| 43 | volatile␍␊ |
| 44 | #endif␍␊ |
| 45 | png_structp png_ptr;␍␊ |
| 46 | volatile int png_cleanup_needed = 0;␍␊ |
| 47 | ␍␊ |
| 48 | #ifdef PNG_SETJMP_SUPPORTED␍␊ |
| 49 | #ifdef USE_FAR_KEYWORD␍␊ |
| 50 | jmp_buf tmp_jmpbuf;␍␊ |
| 51 | #endif␍␊ |
| 52 | #endif␍␊ |
| 53 | ␍␊ |
| 54 | png_debug(1, "in png_create_read_struct");␍␊ |
| 55 | ␍␊ |
| 56 | #ifdef PNG_USER_MEM_SUPPORTED␍␊ |
| 57 | png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,␍␊ |
| 58 | malloc_fn, mem_ptr);␍␊ |
| 59 | #else␍␊ |
| 60 | png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);␍␊ |
| 61 | #endif␍␊ |
| 62 | if (png_ptr == NULL)␍␊ |
| 63 | return (NULL);␍␊ |
| 64 | ␍␊ |
| 65 | /* Added at libpng-1.2.6 */␍␊ |
| 66 | #ifdef PNG_USER_LIMITS_SUPPORTED␍␊ |
| 67 | png_ptr->user_width_max = PNG_USER_WIDTH_MAX;␍␊ |
| 68 | png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;␍␊ |
| 69 | ␍␊ |
| 70 | /* Added at libpng-1.2.43 and 1.4.0 */␍␊ |
| 71 | png_ptr->user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX;␍␊ |
| 72 | ␍␊ |
| 73 | /* Added at libpng-1.2.43 and 1.4.1 */␍␊ |
| 74 | png_ptr->user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX;␍␊ |
| 75 | #endif␍␊ |
| 76 | ␍␊ |
| 77 | #ifdef PNG_SETJMP_SUPPORTED␍␊ |
| 78 | /* Applications that neglect to set up their own setjmp() and then␍␊ |
| 79 | * encounter a png_error() will longjmp here. Since the jmpbuf is␍␊ |
| 80 | * then meaningless we abort instead of returning.␍␊ |
| 81 | */␍␊ |
| 82 | #ifdef USE_FAR_KEYWORD␍␊ |
| 83 | if (setjmp(tmp_jmpbuf))␍␊ |
| 84 | #else␍␊ |
| 85 | if (setjmp(png_jmpbuf(png_ptr))) /* Sets longjmp to match setjmp */␍␊ |
| 86 | #endif␍␊ |
| 87 | PNG_ABORT();␍␊ |
| 88 | #ifdef USE_FAR_KEYWORD␍␊ |
| 89 | png_memcpy(png_jmpbuf(png_ptr), tmp_jmpbuf, png_sizeof(jmp_buf));␍␊ |
| 90 | #endif␍␊ |
| 91 | #endif /* PNG_SETJMP_SUPPORTED */␍␊ |
| 92 | ␍␊ |
| 93 | #ifdef PNG_USER_MEM_SUPPORTED␍␊ |
| 94 | png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);␍␊ |
| 95 | #endif␍␊ |
| 96 | ␍␊ |
| 97 | png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);␍␊ |
| 98 | ␍␊ |
| 99 | /* Call the general version checker (shared with read and write code): */␍␊ |
| 100 | if (!png_user_version_check(png_ptr, user_png_ver))␍␊ |
| 101 | png_cleanup_needed = 1;␍␊ |
| 102 | ␍␊ |
| 103 | if (!png_cleanup_needed)␍␊ |
| 104 | {␍␊ |
| 105 | /* Initialize zbuf - compression buffer */␍␊ |
| 106 | png_ptr->zbuf_size = PNG_ZBUF_SIZE;␍␊ |
| 107 | png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr, png_ptr->zbuf_size);␍␊ |
| 108 | ␍␊ |
| 109 | if (png_ptr->zbuf == NULL)␍␊ |
| 110 | png_cleanup_needed = 1;␍␊ |
| 111 | }␍␊ |
| 112 | ␍␊ |
| 113 | png_ptr->zstream.zalloc = png_zalloc;␍␊ |
| 114 | png_ptr->zstream.zfree = png_zfree;␍␊ |
| 115 | png_ptr->zstream.opaque = (voidpf)png_ptr;␍␊ |
| 116 | ␍␊ |
| 117 | if (!png_cleanup_needed)␍␊ |
| 118 | {␍␊ |
| 119 | #if 1␍␊ |
| 120 | switch (inflateInit(&png_ptr->zstream))␍␊ |
| 121 | ␍␊ |
| 122 | #else␍␊ |
| 123 | int ret = 10;␍␊ |
| 124 | execut_hook("inflateInit", &png_ptr->zstream, &ret, NULL, NULL, NULL, NULL );␍␊ |
| 125 | switch (ret)␍␊ |
| 126 | ␍␊ |
| 127 | #endif␍␊ |
| 128 | switch (inflateInit(&png_ptr->zstream))␍␊ |
| 129 | {␍␊ |
| 130 | case Z_OK:␍␊ |
| 131 | break; /* Do nothing */␍␊ |
| 132 | ␍␊ |
| 133 | case Z_MEM_ERROR:␍␊ |
| 134 | png_warning(png_ptr, "zlib memory error");␍␊ |
| 135 | png_cleanup_needed = 1;␍␊ |
| 136 | break;␍␊ |
| 137 | ␍␊ |
| 138 | case Z_STREAM_ERROR:␍␊ |
| 139 | png_warning(png_ptr, "zlib stream error");␍␊ |
| 140 | png_cleanup_needed = 1;␍␊ |
| 141 | break;␍␊ |
| 142 | ␍␊ |
| 143 | case Z_VERSION_ERROR:␍␊ |
| 144 | png_warning(png_ptr, "zlib version error");␍␊ |
| 145 | png_cleanup_needed = 1;␍␊ |
| 146 | break;␍␊ |
| 147 | ␍␊ |
| 148 | default: png_warning(png_ptr, "Unknown zlib error");␍␊ |
| 149 | png_cleanup_needed = 1;␍␊ |
| 150 | }␍␊ |
| 151 | }␍␊ |
| 152 | ␍␊ |
| 153 | if (png_cleanup_needed)␍␊ |
| 154 | {␍␊ |
| 155 | /* Clean up PNG structure and deallocate any memory. */␍␊ |
| 156 | png_free(png_ptr, png_ptr->zbuf);␍␊ |
| 157 | png_ptr->zbuf = NULL;␍␊ |
| 158 | #ifdef PNG_USER_MEM_SUPPORTED␍␊ |
| 159 | png_destroy_struct_2((png_voidp)png_ptr,␍␊ |
| 160 | (png_free_ptr)free_fn, (png_voidp)mem_ptr);␍␊ |
| 161 | #else␍␊ |
| 162 | png_destroy_struct((png_voidp)png_ptr);␍␊ |
| 163 | #endif␍␊ |
| 164 | return (NULL);␍␊ |
| 165 | }␍␊ |
| 166 | ␍␊ |
| 167 | png_ptr->zstream.next_out = png_ptr->zbuf;␍␊ |
| 168 | png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;␍␊ |
| 169 | ␍␊ |
| 170 | png_set_read_fn(png_ptr, NULL, NULL);␍␊ |
| 171 | ␍␊ |
| 172 | ␍␊ |
| 173 | return (png_ptr);␍␊ |
| 174 | }␍␊ |
| 175 | ␍␊ |
| 176 | ␍␊ |
| 177 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED␍␊ |
| 178 | /* Read the information before the actual image data. This has been␍␊ |
| 179 | * changed in v0.90 to allow reading a file that already has the magic␍␊ |
| 180 | * bytes read from the stream. You can tell libpng how many bytes have␍␊ |
| 181 | * been read from the beginning of the stream (up to the maximum of 8)␍␊ |
| 182 | * via png_set_sig_bytes(), and we will only check the remaining bytes␍␊ |
| 183 | * here. The application can then have access to the signature bytes we␍␊ |
| 184 | * read if it is determined that this isn't a valid PNG file.␍␊ |
| 185 | */␍␊ |
| 186 | void PNGAPI␍␊ |
| 187 | png_read_info(png_structp png_ptr, png_infop info_ptr)␍␊ |
| 188 | {␍␊ |
| 189 | png_debug(1, "in png_read_info");␍␊ |
| 190 | ␍␊ |
| 191 | if (png_ptr == NULL || info_ptr == NULL)␍␊ |
| 192 | return;␍␊ |
| 193 | ␍␊ |
| 194 | /* Read and check the PNG file signature. */␍␊ |
| 195 | png_read_sig(png_ptr, info_ptr);␍␊ |
| 196 | ␍␊ |
| 197 | for (;;)␍␊ |
| 198 | {␍␊ |
| 199 | png_uint_32 length = png_read_chunk_header(png_ptr);␍␊ |
| 200 | png_uint_32 chunk_name = png_ptr->chunk_name;␍␊ |
| 201 | ␍␊ |
| 202 | /* This should be a binary subdivision search or a hash for␍␊ |
| 203 | * matching the chunk name rather than a linear search.␍␊ |
| 204 | */␍␊ |
| 205 | if (chunk_name == png_IDAT)␍␊ |
| 206 | if (png_ptr->mode & PNG_AFTER_IDAT)␍␊ |
| 207 | png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT;␍␊ |
| 208 | ␍␊ |
| 209 | if (chunk_name == png_IHDR)␍␊ |
| 210 | png_handle_IHDR(png_ptr, info_ptr, length);␍␊ |
| 211 | ␍␊ |
| 212 | else if (chunk_name == png_IEND)␍␊ |
| 213 | png_handle_IEND(png_ptr, info_ptr, length);␍␊ |
| 214 | ␍␊ |
| 215 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED␍␊ |
| 216 | else if (png_chunk_unknown_handling(png_ptr, chunk_name) !=␍␊ |
| 217 | PNG_HANDLE_CHUNK_AS_DEFAULT)␍␊ |
| 218 | {␍␊ |
| 219 | if (chunk_name == png_IDAT)␍␊ |
| 220 | png_ptr->mode |= PNG_HAVE_IDAT;␍␊ |
| 221 | ␍␊ |
| 222 | png_handle_unknown(png_ptr, info_ptr, length);␍␊ |
| 223 | ␍␊ |
| 224 | if (chunk_name == png_PLTE)␍␊ |
| 225 | png_ptr->mode |= PNG_HAVE_PLTE;␍␊ |
| 226 | ␍␊ |
| 227 | else if (chunk_name == png_IDAT)␍␊ |
| 228 | {␍␊ |
| 229 | if (!(png_ptr->mode & PNG_HAVE_IHDR))␍␊ |
| 230 | png_error(png_ptr, "Missing IHDR before IDAT");␍␊ |
| 231 | ␍␊ |
| 232 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&␍␊ |
| 233 | !(png_ptr->mode & PNG_HAVE_PLTE))␍␊ |
| 234 | png_error(png_ptr, "Missing PLTE before IDAT");␍␊ |
| 235 | ␍␊ |
| 236 | break;␍␊ |
| 237 | }␍␊ |
| 238 | }␍␊ |
| 239 | #endif␍␊ |
| 240 | else if (chunk_name == png_PLTE)␍␊ |
| 241 | png_handle_PLTE(png_ptr, info_ptr, length);␍␊ |
| 242 | ␍␊ |
| 243 | else if (chunk_name == png_IDAT)␍␊ |
| 244 | {␍␊ |
| 245 | if (!(png_ptr->mode & PNG_HAVE_IHDR))␍␊ |
| 246 | png_error(png_ptr, "Missing IHDR before IDAT");␍␊ |
| 247 | ␍␊ |
| 248 | else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&␍␊ |
| 249 | !(png_ptr->mode & PNG_HAVE_PLTE))␍␊ |
| 250 | png_error(png_ptr, "Missing PLTE before IDAT");␍␊ |
| 251 | ␍␊ |
| 252 | png_ptr->idat_size = length;␍␊ |
| 253 | png_ptr->mode |= PNG_HAVE_IDAT;␍␊ |
| 254 | break;␍␊ |
| 255 | }␍␊ |
| 256 | ␍␊ |
| 257 | #ifdef PNG_READ_bKGD_SUPPORTED␍␊ |
| 258 | else if (chunk_name == png_bKGD)␍␊ |
| 259 | png_handle_bKGD(png_ptr, info_ptr, length);␍␊ |
| 260 | #endif␍␊ |
| 261 | ␍␊ |
| 262 | #ifdef PNG_READ_cHRM_SUPPORTED␍␊ |
| 263 | else if (chunk_name == png_cHRM)␍␊ |
| 264 | png_handle_cHRM(png_ptr, info_ptr, length);␍␊ |
| 265 | #endif␍␊ |
| 266 | ␍␊ |
| 267 | #ifdef PNG_READ_gAMA_SUPPORTED␍␊ |
| 268 | else if (chunk_name == png_gAMA)␍␊ |
| 269 | png_handle_gAMA(png_ptr, info_ptr, length);␍␊ |
| 270 | #endif␍␊ |
| 271 | ␍␊ |
| 272 | #ifdef PNG_READ_hIST_SUPPORTED␍␊ |
| 273 | else if (chunk_name == png_hIST)␍␊ |
| 274 | png_handle_hIST(png_ptr, info_ptr, length);␍␊ |
| 275 | #endif␍␊ |
| 276 | ␍␊ |
| 277 | #ifdef PNG_READ_oFFs_SUPPORTED␍␊ |
| 278 | else if (chunk_name == png_oFFs)␍␊ |
| 279 | png_handle_oFFs(png_ptr, info_ptr, length);␍␊ |
| 280 | #endif␍␊ |
| 281 | ␍␊ |
| 282 | #ifdef PNG_READ_pCAL_SUPPORTED␍␊ |
| 283 | else if (chunk_name == png_pCAL)␍␊ |
| 284 | png_handle_pCAL(png_ptr, info_ptr, length);␍␊ |
| 285 | #endif␍␊ |
| 286 | ␍␊ |
| 287 | #ifdef PNG_READ_sCAL_SUPPORTED␍␊ |
| 288 | else if (chunk_name == png_sCAL)␍␊ |
| 289 | png_handle_sCAL(png_ptr, info_ptr, length);␍␊ |
| 290 | #endif␍␊ |
| 291 | ␍␊ |
| 292 | #ifdef PNG_READ_pHYs_SUPPORTED␍␊ |
| 293 | else if (chunk_name == png_pHYs)␍␊ |
| 294 | png_handle_pHYs(png_ptr, info_ptr, length);␍␊ |
| 295 | #endif␍␊ |
| 296 | ␍␊ |
| 297 | #ifdef PNG_READ_sBIT_SUPPORTED␍␊ |
| 298 | else if (chunk_name == png_sBIT)␍␊ |
| 299 | png_handle_sBIT(png_ptr, info_ptr, length);␍␊ |
| 300 | #endif␍␊ |
| 301 | ␍␊ |
| 302 | #ifdef PNG_READ_sRGB_SUPPORTED␍␊ |
| 303 | else if (chunk_name == png_sRGB)␍␊ |
| 304 | png_handle_sRGB(png_ptr, info_ptr, length);␍␊ |
| 305 | #endif␍␊ |
| 306 | ␍␊ |
| 307 | #ifdef PNG_READ_iCCP_SUPPORTED␍␊ |
| 308 | else if (chunk_name == png_iCCP)␍␊ |
| 309 | png_handle_iCCP(png_ptr, info_ptr, length);␍␊ |
| 310 | #endif␍␊ |
| 311 | ␍␊ |
| 312 | #ifdef PNG_READ_sPLT_SUPPORTED␍␊ |
| 313 | else if (chunk_name == png_sPLT)␍␊ |
| 314 | png_handle_sPLT(png_ptr, info_ptr, length);␍␊ |
| 315 | #endif␍␊ |
| 316 | ␍␊ |
| 317 | #ifdef PNG_READ_tEXt_SUPPORTED␍␊ |
| 318 | else if (chunk_name == png_tEXt)␍␊ |
| 319 | png_handle_tEXt(png_ptr, info_ptr, length);␍␊ |
| 320 | #endif␍␊ |
| 321 | ␍␊ |
| 322 | #ifdef PNG_READ_tIME_SUPPORTED␍␊ |
| 323 | else if (chunk_name == png_tIME)␍␊ |
| 324 | png_handle_tIME(png_ptr, info_ptr, length);␍␊ |
| 325 | #endif␍␊ |
| 326 | ␍␊ |
| 327 | #ifdef PNG_READ_tRNS_SUPPORTED␍␊ |
| 328 | else if (chunk_name == png_tRNS)␍␊ |
| 329 | png_handle_tRNS(png_ptr, info_ptr, length);␍␊ |
| 330 | #endif␍␊ |
| 331 | ␍␊ |
| 332 | #ifdef PNG_READ_zTXt_SUPPORTED␍␊ |
| 333 | else if (chunk_name == png_zTXt)␍␊ |
| 334 | png_handle_zTXt(png_ptr, info_ptr, length);␍␊ |
| 335 | #endif␍␊ |
| 336 | ␍␊ |
| 337 | #ifdef PNG_READ_iTXt_SUPPORTED␍␊ |
| 338 | else if (chunk_name == png_iTXt)␍␊ |
| 339 | png_handle_iTXt(png_ptr, info_ptr, length);␍␊ |
| 340 | #endif␍␊ |
| 341 | ␍␊ |
| 342 | else␍␊ |
| 343 | png_handle_unknown(png_ptr, info_ptr, length);␍␊ |
| 344 | }␍␊ |
| 345 | }␍␊ |
| 346 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */␍␊ |
| 347 | ␍␊ |
| 348 | /* Optional call to update the users info_ptr structure */␍␊ |
| 349 | void PNGAPI␍␊ |
| 350 | png_read_update_info(png_structp png_ptr, png_infop info_ptr)␍␊ |
| 351 | {␍␊ |
| 352 | png_debug(1, "in png_read_update_info");␍␊ |
| 353 | ␍␊ |
| 354 | if (png_ptr == NULL)␍␊ |
| 355 | return;␍␊ |
| 356 | ␍␊ |
| 357 | png_read_start_row(png_ptr);␍␊ |
| 358 | ␍␊ |
| 359 | #ifdef PNG_READ_TRANSFORMS_SUPPORTED␍␊ |
| 360 | png_read_transform_info(png_ptr, info_ptr);␍␊ |
| 361 | #else␍␊ |
| 362 | PNG_UNUSED(info_ptr)␍␊ |
| 363 | #endif␍␊ |
| 364 | }␍␊ |
| 365 | ␍␊ |
| 366 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED␍␊ |
| 367 | /* Initialize palette, background, etc, after transformations␍␊ |
| 368 | * are set, but before any reading takes place. This allows␍␊ |
| 369 | * the user to obtain a gamma-corrected palette, for example.␍␊ |
| 370 | * If the user doesn't call this, we will do it ourselves.␍␊ |
| 371 | */␍␊ |
| 372 | void PNGAPI␍␊ |
| 373 | png_start_read_image(png_structp png_ptr)␍␊ |
| 374 | {␍␊ |
| 375 | png_debug(1, "in png_start_read_image");␍␊ |
| 376 | ␍␊ |
| 377 | if (png_ptr != NULL)␍␊ |
| 378 | png_read_start_row(png_ptr);␍␊ |
| 379 | }␍␊ |
| 380 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */␍␊ |
| 381 | ␍␊ |
| 382 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED␍␊ |
| 383 | void PNGAPI␍␊ |
| 384 | png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)␍␊ |
| 385 | {␍␊ |
| 386 | int ret;␍␊ |
| 387 | ␍␊ |
| 388 | png_row_info row_info;␍␊ |
| 389 | ␍␊ |
| 390 | if (png_ptr == NULL)␍␊ |
| 391 | return;␍␊ |
| 392 | ␍␊ |
| 393 | png_debug2(1, "in png_read_row (row %lu, pass %d)",␍␊ |
| 394 | (unsigned long)png_ptr->row_number, png_ptr->pass);␍␊ |
| 395 | ␍␊ |
| 396 | /* png_read_start_row sets the information (in particular iwidth) for this␍␊ |
| 397 | * interlace pass.␍␊ |
| 398 | */␍␊ |
| 399 | if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))␍␊ |
| 400 | png_read_start_row(png_ptr);␍␊ |
| 401 | ␍␊ |
| 402 | /* 1.5.6: row_info moved out of png_struct to a local here. */␍␊ |
| 403 | row_info.width = png_ptr->iwidth; /* NOTE: width of current interlaced row */␍␊ |
| 404 | row_info.color_type = png_ptr->color_type;␍␊ |
| 405 | row_info.bit_depth = png_ptr->bit_depth;␍␊ |
| 406 | row_info.channels = png_ptr->channels;␍␊ |
| 407 | row_info.pixel_depth = png_ptr->pixel_depth;␍␊ |
| 408 | row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width);␍␊ |
| 409 | ␍␊ |
| 410 | if (png_ptr->row_number == 0 && png_ptr->pass == 0)␍␊ |
| 411 | {␍␊ |
| 412 | /* Check for transforms that have been set but were defined out */␍␊ |
| 413 | #if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)␍␊ |
| 414 | if (png_ptr->transformations & PNG_INVERT_MONO)␍␊ |
| 415 | png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined");␍␊ |
| 416 | #endif␍␊ |
| 417 | ␍␊ |
| 418 | #if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)␍␊ |
| 419 | if (png_ptr->transformations & PNG_FILLER)␍␊ |
| 420 | png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined");␍␊ |
| 421 | #endif␍␊ |
| 422 | ␍␊ |
| 423 | #if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \␍␊ |
| 424 | !defined(PNG_READ_PACKSWAP_SUPPORTED)␍␊ |
| 425 | if (png_ptr->transformations & PNG_PACKSWAP)␍␊ |
| 426 | png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined");␍␊ |
| 427 | #endif␍␊ |
| 428 | ␍␊ |
| 429 | #if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)␍␊ |
| 430 | if (png_ptr->transformations & PNG_PACK)␍␊ |
| 431 | png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined");␍␊ |
| 432 | #endif␍␊ |
| 433 | ␍␊ |
| 434 | #if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)␍␊ |
| 435 | if (png_ptr->transformations & PNG_SHIFT)␍␊ |
| 436 | png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined");␍␊ |
| 437 | #endif␍␊ |
| 438 | ␍␊ |
| 439 | #if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)␍␊ |
| 440 | if (png_ptr->transformations & PNG_BGR)␍␊ |
| 441 | png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined");␍␊ |
| 442 | #endif␍␊ |
| 443 | ␍␊ |
| 444 | #if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)␍␊ |
| 445 | if (png_ptr->transformations & PNG_SWAP_BYTES)␍␊ |
| 446 | png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined");␍␊ |
| 447 | #endif␍␊ |
| 448 | }␍␊ |
| 449 | ␍␊ |
| 450 | #ifdef PNG_READ_INTERLACING_SUPPORTED␍␊ |
| 451 | /* If interlaced and we do not need a new row, combine row and return.␍␊ |
| 452 | * Notice that the pixels we have from previous rows have been transformed␍␊ |
| 453 | * already; we can only combine like with like (transformed or␍␊ |
| 454 | * untransformed) and, because of the libpng API for interlaced images, this␍␊ |
| 455 | * means we must transform before de-interlacing.␍␊ |
| 456 | */␍␊ |
| 457 | if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))␍␊ |
| 458 | {␍␊ |
| 459 | switch (png_ptr->pass)␍␊ |
| 460 | {␍␊ |
| 461 | case 0:␍␊ |
| 462 | if (png_ptr->row_number & 0x07)␍␊ |
| 463 | {␍␊ |
| 464 | if (dsp_row != NULL)␍␊ |
| 465 | png_combine_row(png_ptr, dsp_row, 1/*display*/);␍␊ |
| 466 | png_read_finish_row(png_ptr);␍␊ |
| 467 | return;␍␊ |
| 468 | }␍␊ |
| 469 | break;␍␊ |
| 470 | ␍␊ |
| 471 | case 1:␍␊ |
| 472 | if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)␍␊ |
| 473 | {␍␊ |
| 474 | if (dsp_row != NULL)␍␊ |
| 475 | png_combine_row(png_ptr, dsp_row, 1/*display*/);␍␊ |
| 476 | ␍␊ |
| 477 | png_read_finish_row(png_ptr);␍␊ |
| 478 | return;␍␊ |
| 479 | }␍␊ |
| 480 | break;␍␊ |
| 481 | ␍␊ |
| 482 | case 2:␍␊ |
| 483 | if ((png_ptr->row_number & 0x07) != 4)␍␊ |
| 484 | {␍␊ |
| 485 | if (dsp_row != NULL && (png_ptr->row_number & 4))␍␊ |
| 486 | png_combine_row(png_ptr, dsp_row, 1/*display*/);␍␊ |
| 487 | ␍␊ |
| 488 | png_read_finish_row(png_ptr);␍␊ |
| 489 | return;␍␊ |
| 490 | }␍␊ |
| 491 | break;␍␊ |
| 492 | ␍␊ |
| 493 | case 3:␍␊ |
| 494 | if ((png_ptr->row_number & 3) || png_ptr->width < 3)␍␊ |
| 495 | {␍␊ |
| 496 | if (dsp_row != NULL)␍␊ |
| 497 | png_combine_row(png_ptr, dsp_row, 1/*display*/);␍␊ |
| 498 | ␍␊ |
| 499 | png_read_finish_row(png_ptr);␍␊ |
| 500 | return;␍␊ |
| 501 | }␍␊ |
| 502 | break;␍␊ |
| 503 | ␍␊ |
| 504 | case 4:␍␊ |
| 505 | if ((png_ptr->row_number & 3) != 2)␍␊ |
| 506 | {␍␊ |
| 507 | if (dsp_row != NULL && (png_ptr->row_number & 2))␍␊ |
| 508 | png_combine_row(png_ptr, dsp_row, 1/*display*/);␍␊ |
| 509 | ␍␊ |
| 510 | png_read_finish_row(png_ptr);␍␊ |
| 511 | return;␍␊ |
| 512 | }␍␊ |
| 513 | break;␍␊ |
| 514 | case 5:␍␊ |
| 515 | if ((png_ptr->row_number & 1) || png_ptr->width < 2)␍␊ |
| 516 | {␍␊ |
| 517 | if (dsp_row != NULL)␍␊ |
| 518 | png_combine_row(png_ptr, dsp_row, 1/*display*/);␍␊ |
| 519 | ␍␊ |
| 520 | png_read_finish_row(png_ptr);␍␊ |
| 521 | return;␍␊ |
| 522 | }␍␊ |
| 523 | break;␍␊ |
| 524 | ␍␊ |
| 525 | default:␍␊ |
| 526 | case 6:␍␊ |
| 527 | if (!(png_ptr->row_number & 1))␍␊ |
| 528 | {␍␊ |
| 529 | png_read_finish_row(png_ptr);␍␊ |
| 530 | return;␍␊ |
| 531 | }␍␊ |
| 532 | break;␍␊ |
| 533 | }␍␊ |
| 534 | }␍␊ |
| 535 | #endif␍␊ |
| 536 | ␍␊ |
| 537 | if (!(png_ptr->mode & PNG_HAVE_IDAT))␍␊ |
| 538 | png_error(png_ptr, "Invalid attempt to read row data");␍␊ |
| 539 | ␍␊ |
| 540 | png_ptr->zstream.next_out = png_ptr->row_buf;␍␊ |
| 541 | png_ptr->zstream.avail_out =␍␊ |
| 542 | (uInt)(PNG_ROWBYTES(png_ptr->pixel_depth,␍␊ |
| 543 | png_ptr->iwidth) + 1);␍␊ |
| 544 | ␍␊ |
| 545 | do␍␊ |
| 546 | {␍␊ |
| 547 | if (!(png_ptr->zstream.avail_in))␍␊ |
| 548 | {␍␊ |
| 549 | while (!png_ptr->idat_size)␍␊ |
| 550 | {␍␊ |
| 551 | png_crc_finish(png_ptr, 0);␍␊ |
| 552 | ␍␊ |
| 553 | png_ptr->idat_size = png_read_chunk_header(png_ptr);␍␊ |
| 554 | if (png_ptr->chunk_name != png_IDAT)␍␊ |
| 555 | png_error(png_ptr, "Not enough image data");␍␊ |
| 556 | }␍␊ |
| 557 | png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size;␍␊ |
| 558 | png_ptr->zstream.next_in = png_ptr->zbuf;␍␊ |
| 559 | if (png_ptr->zbuf_size > png_ptr->idat_size)␍␊ |
| 560 | png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size;␍␊ |
| 561 | png_crc_read(png_ptr, png_ptr->zbuf,␍␊ |
| 562 | (png_size_t)png_ptr->zstream.avail_in);␍␊ |
| 563 | png_ptr->idat_size -= png_ptr->zstream.avail_in;␍␊ |
| 564 | }␍␊ |
| 565 | ␍␊ |
| 566 | #if 1␍␊ |
| 567 | ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);␍␊ |
| 568 | ␍␊ |
| 569 | #else␍␊ |
| 570 | int flush = Z_PARTIAL_FLUSH;␍␊ |
| 571 | execut_hook("inflate", &png_ptr->zstream, &flush, &ret, NULL, NULL, NULL );␍␊ |
| 572 | #endif␍␊ |
| 573 | if (ret == Z_STREAM_END)␍␊ |
| 574 | {␍␊ |
| 575 | if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in ||␍␊ |
| 576 | png_ptr->idat_size)␍␊ |
| 577 | png_benign_error(png_ptr, "Extra compressed data");␍␊ |
| 578 | png_ptr->mode |= PNG_AFTER_IDAT;␍␊ |
| 579 | png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;␍␊ |
| 580 | break;␍␊ |
| 581 | }␍␊ |
| 582 | ␍␊ |
| 583 | if (ret != Z_OK)␍␊ |
| 584 | png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg :␍␊ |
| 585 | "Decompression error");␍␊ |
| 586 | ␍␊ |
| 587 | } while (png_ptr->zstream.avail_out);␍␊ |
| 588 | ␍␊ |
| 589 | if (png_ptr->row_buf[0] > PNG_FILTER_VALUE_NONE)␍␊ |
| 590 | {␍␊ |
| 591 | if (png_ptr->row_buf[0] < PNG_FILTER_VALUE_LAST)␍␊ |
| 592 | png_read_filter_row(png_ptr, &row_info, png_ptr->row_buf + 1,␍␊ |
| 593 | png_ptr->prev_row + 1, png_ptr->row_buf[0]);␍␊ |
| 594 | else␍␊ |
| 595 | png_error(png_ptr, "bad adaptive filter value");␍␊ |
| 596 | }␍␊ |
| 597 | ␍␊ |
| 598 | /* libpng 1.5.6: the following line was copying png_ptr->rowbytes before␍␊ |
| 599 | * 1.5.6, while the buffer really is this big in current versions of libpng␍␊ |
| 600 | * it may not be in the future, so this was changed just to copy the␍␊ |
| 601 | * interlaced count:␍␊ |
| 602 | */␍␊ |
| 603 | png_memcpy(png_ptr->prev_row, png_ptr->row_buf, row_info.rowbytes + 1);␍␊ |
| 604 | ␍␊ |
| 605 | #ifdef PNG_MNG_FEATURES_SUPPORTED␍␊ |
| 606 | if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&␍␊ |
| 607 | (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))␍␊ |
| 608 | {␍␊ |
| 609 | /* Intrapixel differencing */␍␊ |
| 610 | png_do_read_intrapixel(&row_info, png_ptr->row_buf + 1);␍␊ |
| 611 | }␍␊ |
| 612 | #endif␍␊ |
| 613 | ␍␊ |
| 614 | ␍␊ |
| 615 | #ifdef PNG_READ_TRANSFORMS_SUPPORTED␍␊ |
| 616 | if (png_ptr->transformations)␍␊ |
| 617 | png_do_read_transformations(png_ptr, &row_info);␍␊ |
| 618 | #endif␍␊ |
| 619 | ␍␊ |
| 620 | /* The transformed pixel depth should match the depth now in row_info. */␍␊ |
| 621 | if (png_ptr->transformed_pixel_depth == 0)␍␊ |
| 622 | {␍␊ |
| 623 | png_ptr->transformed_pixel_depth = row_info.pixel_depth;␍␊ |
| 624 | if (row_info.pixel_depth > png_ptr->maximum_pixel_depth)␍␊ |
| 625 | png_error(png_ptr, "sequential row overflow");␍␊ |
| 626 | }␍␊ |
| 627 | ␍␊ |
| 628 | else if (png_ptr->transformed_pixel_depth != row_info.pixel_depth)␍␊ |
| 629 | png_error(png_ptr, "internal sequential row size calculation error");␍␊ |
| 630 | ␍␊ |
| 631 | #ifdef PNG_READ_INTERLACING_SUPPORTED␍␊ |
| 632 | /* Blow up interlaced rows to full size */␍␊ |
| 633 | if (png_ptr->interlaced &&␍␊ |
| 634 | (png_ptr->transformations & PNG_INTERLACE))␍␊ |
| 635 | {␍␊ |
| 636 | if (png_ptr->pass < 6)␍␊ |
| 637 | png_do_read_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass,␍␊ |
| 638 | png_ptr->transformations);␍␊ |
| 639 | ␍␊ |
| 640 | if (dsp_row != NULL)␍␊ |
| 641 | png_combine_row(png_ptr, dsp_row, 1/*display*/);␍␊ |
| 642 | ␍␊ |
| 643 | if (row != NULL)␍␊ |
| 644 | png_combine_row(png_ptr, row, 0/*row*/);␍␊ |
| 645 | }␍␊ |
| 646 | ␍␊ |
| 647 | else␍␊ |
| 648 | #endif␍␊ |
| 649 | {␍␊ |
| 650 | if (row != NULL)␍␊ |
| 651 | png_combine_row(png_ptr, row, -1/*ignored*/);␍␊ |
| 652 | ␍␊ |
| 653 | if (dsp_row != NULL)␍␊ |
| 654 | png_combine_row(png_ptr, dsp_row, -1/*ignored*/);␍␊ |
| 655 | }␍␊ |
| 656 | png_read_finish_row(png_ptr);␍␊ |
| 657 | ␍␊ |
| 658 | if (png_ptr->read_row_fn != NULL)␍␊ |
| 659 | (*(png_ptr->read_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);␍␊ |
| 660 | }␍␊ |
| 661 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */␍␊ |
| 662 | ␍␊ |
| 663 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED␍␊ |
| 664 | /* Read one or more rows of image data. If the image is interlaced,␍␊ |
| 665 | * and png_set_interlace_handling() has been called, the rows need to␍␊ |
| 666 | * contain the contents of the rows from the previous pass. If the␍␊ |
| 667 | * image has alpha or transparency, and png_handle_alpha()[*] has been␍␊ |
| 668 | * called, the rows contents must be initialized to the contents of the␍␊ |
| 669 | * screen.␍␊ |
| 670 | *␍␊ |
| 671 | * "row" holds the actual image, and pixels are placed in it␍␊ |
| 672 | * as they arrive. If the image is displayed after each pass, it will␍␊ |
| 673 | * appear to "sparkle" in. "display_row" can be used to display a␍␊ |
| 674 | * "chunky" progressive image, with finer detail added as it becomes␍␊ |
| 675 | * available. If you do not want this "chunky" display, you may pass␍␊ |
| 676 | * NULL for display_row. If you do not want the sparkle display, and␍␊ |
| 677 | * you have not called png_handle_alpha(), you may pass NULL for rows.␍␊ |
| 678 | * If you have called png_handle_alpha(), and the image has either an␍␊ |
| 679 | * alpha channel or a transparency chunk, you must provide a buffer for␍␊ |
| 680 | * rows. In this case, you do not have to provide a display_row buffer␍␊ |
| 681 | * also, but you may. If the image is not interlaced, or if you have␍␊ |
| 682 | * not called png_set_interlace_handling(), the display_row buffer will␍␊ |
| 683 | * be ignored, so pass NULL to it.␍␊ |
| 684 | *␍␊ |
| 685 | * [*] png_handle_alpha() does not exist yet, as of this version of libpng␍␊ |
| 686 | */␍␊ |
| 687 | ␍␊ |
| 688 | void PNGAPI␍␊ |
| 689 | png_read_rows(png_structp png_ptr, png_bytepp row,␍␊ |
| 690 | png_bytepp display_row, png_uint_32 num_rows)␍␊ |
| 691 | {␍␊ |
| 692 | png_uint_32 i;␍␊ |
| 693 | png_bytepp rp;␍␊ |
| 694 | png_bytepp dp;␍␊ |
| 695 | ␍␊ |
| 696 | png_debug(1, "in png_read_rows");␍␊ |
| 697 | ␍␊ |
| 698 | if (png_ptr == NULL)␍␊ |
| 699 | return;␍␊ |
| 700 | ␍␊ |
| 701 | rp = row;␍␊ |
| 702 | dp = display_row;␍␊ |
| 703 | if (rp != NULL && dp != NULL)␍␊ |
| 704 | for (i = 0; i < num_rows; i++)␍␊ |
| 705 | {␍␊ |
| 706 | png_bytep rptr = *rp++;␍␊ |
| 707 | png_bytep dptr = *dp++;␍␊ |
| 708 | ␍␊ |
| 709 | png_read_row(png_ptr, rptr, dptr);␍␊ |
| 710 | }␍␊ |
| 711 | ␍␊ |
| 712 | else if (rp != NULL)␍␊ |
| 713 | for (i = 0; i < num_rows; i++)␍␊ |
| 714 | {␍␊ |
| 715 | png_bytep rptr = *rp;␍␊ |
| 716 | png_read_row(png_ptr, rptr, NULL);␍␊ |
| 717 | rp++;␍␊ |
| 718 | }␍␊ |
| 719 | ␍␊ |
| 720 | else if (dp != NULL)␍␊ |
| 721 | for (i = 0; i < num_rows; i++)␍␊ |
| 722 | {␍␊ |
| 723 | png_bytep dptr = *dp;␍␊ |
| 724 | png_read_row(png_ptr, NULL, dptr);␍␊ |
| 725 | dp++;␍␊ |
| 726 | }␍␊ |
| 727 | }␍␊ |
| 728 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */␍␊ |
| 729 | ␍␊ |
| 730 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED␍␊ |
| 731 | /* Read the entire image. If the image has an alpha channel or a tRNS␍␊ |
| 732 | * chunk, and you have called png_handle_alpha()[*], you will need to␍␊ |
| 733 | * initialize the image to the current image that PNG will be overlaying.␍␊ |
| 734 | * We set the num_rows again here, in case it was incorrectly set in␍␊ |
| 735 | * png_read_start_row() by a call to png_read_update_info() or␍␊ |
| 736 | * png_start_read_image() if png_set_interlace_handling() wasn't called␍␊ |
| 737 | * prior to either of these functions like it should have been. You can␍␊ |
| 738 | * only call this function once. If you desire to have an image for␍␊ |
| 739 | * each pass of a interlaced image, use png_read_rows() instead.␍␊ |
| 740 | *␍␊ |
| 741 | * [*] png_handle_alpha() does not exist yet, as of this version of libpng␍␊ |
| 742 | */␍␊ |
| 743 | void PNGAPI␍␊ |
| 744 | png_read_image(png_structp png_ptr, png_bytepp image)␍␊ |
| 745 | {␍␊ |
| 746 | png_uint_32 i, image_height;␍␊ |
| 747 | int pass, j;␍␊ |
| 748 | png_bytepp rp;␍␊ |
| 749 | ␍␊ |
| 750 | png_debug(1, "in png_read_image");␍␊ |
| 751 | ␍␊ |
| 752 | if (png_ptr == NULL)␍␊ |
| 753 | return;␍␊ |
| 754 | ␍␊ |
| 755 | #ifdef PNG_READ_INTERLACING_SUPPORTED␍␊ |
| 756 | if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))␍␊ |
| 757 | {␍␊ |
| 758 | pass = png_set_interlace_handling(png_ptr);␍␊ |
| 759 | /* And make sure transforms are initialized. */␍␊ |
| 760 | png_start_read_image(png_ptr);␍␊ |
| 761 | }␍␊ |
| 762 | else␍␊ |
| 763 | {␍␊ |
| 764 | if (png_ptr->interlaced && !(png_ptr->transformations & PNG_INTERLACE))␍␊ |
| 765 | {␍␊ |
| 766 | /* Caller called png_start_read_image or png_read_update_info without␍␊ |
| 767 | * first turning on the PNG_INTERLACE transform. We can fix this here,␍␊ |
| 768 | * but the caller should do it!␍␊ |
| 769 | */␍␊ |
| 770 | png_warning(png_ptr, "Interlace handling should be turned on when "␍␊ |
| 771 | "using png_read_image");␍␊ |
| 772 | /* Make sure this is set correctly */␍␊ |
| 773 | png_ptr->num_rows = png_ptr->height;␍␊ |
| 774 | }␍␊ |
| 775 | ␍␊ |
| 776 | /* Obtain the pass number, which also turns on the PNG_INTERLACE flag in␍␊ |
| 777 | * the above error case.␍␊ |
| 778 | */␍␊ |
| 779 | pass = png_set_interlace_handling(png_ptr);␍␊ |
| 780 | }␍␊ |
| 781 | #else␍␊ |
| 782 | if (png_ptr->interlaced)␍␊ |
| 783 | png_error(png_ptr,␍␊ |
| 784 | "Cannot read interlaced image -- interlace handler disabled");␍␊ |
| 785 | ␍␊ |
| 786 | pass = 1;␍␊ |
| 787 | #endif␍␊ |
| 788 | ␍␊ |
| 789 | image_height=png_ptr->height;␍␊ |
| 790 | ␍␊ |
| 791 | for (j = 0; j < pass; j++)␍␊ |
| 792 | {␍␊ |
| 793 | rp = image;␍␊ |
| 794 | for (i = 0; i < image_height; i++)␍␊ |
| 795 | {␍␊ |
| 796 | png_read_row(png_ptr, *rp, NULL);␍␊ |
| 797 | rp++;␍␊ |
| 798 | }␍␊ |
| 799 | }␍␊ |
| 800 | }␍␊ |
| 801 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */␍␊ |
| 802 | ␍␊ |
| 803 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED␍␊ |
| 804 | /* Read the end of the PNG file. Will not read past the end of the␍␊ |
| 805 | * file, will verify the end is accurate, and will read any comments␍␊ |
| 806 | * or time information at the end of the file, if info is not NULL.␍␊ |
| 807 | */␍␊ |
| 808 | void PNGAPI␍␊ |
| 809 | png_read_end(png_structp png_ptr, png_infop info_ptr)␍␊ |
| 810 | {␍␊ |
| 811 | png_debug(1, "in png_read_end");␍␊ |
| 812 | ␍␊ |
| 813 | if (png_ptr == NULL)␍␊ |
| 814 | return;␍␊ |
| 815 | ␍␊ |
| 816 | png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */␍␊ |
| 817 | ␍␊ |
| 818 | #ifdef PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED␍␊ |
| 819 | /* Report invalid palette index; added at libng-1.5.10 */␍␊ |
| 820 | if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&␍␊ |
| 821 | png_ptr->num_palette_max > png_ptr->num_palette)␍␊ |
| 822 | png_benign_error(png_ptr, "Read palette index exceeding num_palette");␍␊ |
| 823 | #endif␍␊ |
| 824 | ␍␊ |
| 825 | do␍␊ |
| 826 | {␍␊ |
| 827 | png_uint_32 length = png_read_chunk_header(png_ptr);␍␊ |
| 828 | png_uint_32 chunk_name = png_ptr->chunk_name;␍␊ |
| 829 | ␍␊ |
| 830 | if (chunk_name == png_IHDR)␍␊ |
| 831 | png_handle_IHDR(png_ptr, info_ptr, length);␍␊ |
| 832 | ␍␊ |
| 833 | else if (chunk_name == png_IEND)␍␊ |
| 834 | png_handle_IEND(png_ptr, info_ptr, length);␍␊ |
| 835 | ␍␊ |
| 836 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED␍␊ |
| 837 | else if (png_chunk_unknown_handling(png_ptr, chunk_name) !=␍␊ |
| 838 | PNG_HANDLE_CHUNK_AS_DEFAULT)␍␊ |
| 839 | {␍␊ |
| 840 | if (chunk_name == png_IDAT)␍␊ |
| 841 | {␍␊ |
| 842 | if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))␍␊ |
| 843 | png_benign_error(png_ptr, "Too many IDATs found");␍␊ |
| 844 | }␍␊ |
| 845 | png_handle_unknown(png_ptr, info_ptr, length);␍␊ |
| 846 | if (chunk_name == png_PLTE)␍␊ |
| 847 | png_ptr->mode |= PNG_HAVE_PLTE;␍␊ |
| 848 | }␍␊ |
| 849 | #endif␍␊ |
| 850 | ␍␊ |
| 851 | else if (chunk_name == png_IDAT)␍␊ |
| 852 | {␍␊ |
| 853 | /* Zero length IDATs are legal after the last IDAT has been␍␊ |
| 854 | * read, but not after other chunks have been read.␍␊ |
| 855 | */␍␊ |
| 856 | if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))␍␊ |
| 857 | png_benign_error(png_ptr, "Too many IDATs found");␍␊ |
| 858 | ␍␊ |
| 859 | png_crc_finish(png_ptr, length);␍␊ |
| 860 | }␍␊ |
| 861 | else if (chunk_name == png_PLTE)␍␊ |
| 862 | png_handle_PLTE(png_ptr, info_ptr, length);␍␊ |
| 863 | ␍␊ |
| 864 | #ifdef PNG_READ_bKGD_SUPPORTED␍␊ |
| 865 | else if (chunk_name == png_bKGD)␍␊ |
| 866 | png_handle_bKGD(png_ptr, info_ptr, length);␍␊ |
| 867 | #endif␍␊ |
| 868 | ␍␊ |
| 869 | #ifdef PNG_READ_cHRM_SUPPORTED␍␊ |
| 870 | else if (chunk_name == png_cHRM)␍␊ |
| 871 | png_handle_cHRM(png_ptr, info_ptr, length);␍␊ |
| 872 | #endif␍␊ |
| 873 | ␍␊ |
| 874 | #ifdef PNG_READ_gAMA_SUPPORTED␍␊ |
| 875 | else if (chunk_name == png_gAMA)␍␊ |
| 876 | png_handle_gAMA(png_ptr, info_ptr, length);␍␊ |
| 877 | #endif␍␊ |
| 878 | ␍␊ |
| 879 | #ifdef PNG_READ_hIST_SUPPORTED␍␊ |
| 880 | else if (chunk_name == png_hIST)␍␊ |
| 881 | png_handle_hIST(png_ptr, info_ptr, length);␍␊ |
| 882 | #endif␍␊ |
| 883 | ␍␊ |
| 884 | #ifdef PNG_READ_oFFs_SUPPORTED␍␊ |
| 885 | else if (chunk_name == png_oFFs)␍␊ |
| 886 | png_handle_oFFs(png_ptr, info_ptr, length);␍␊ |
| 887 | #endif␍␊ |
| 888 | ␍␊ |
| 889 | #ifdef PNG_READ_pCAL_SUPPORTED␍␊ |
| 890 | else if (chunk_name == png_pCAL)␍␊ |
| 891 | png_handle_pCAL(png_ptr, info_ptr, length);␍␊ |
| 892 | #endif␍␊ |
| 893 | ␍␊ |
| 894 | #ifdef PNG_READ_sCAL_SUPPORTED␍␊ |
| 895 | else if (chunk_name == png_sCAL)␍␊ |
| 896 | png_handle_sCAL(png_ptr, info_ptr, length);␍␊ |
| 897 | #endif␍␊ |
| 898 | ␍␊ |
| 899 | #ifdef PNG_READ_pHYs_SUPPORTED␍␊ |
| 900 | else if (chunk_name == png_pHYs)␍␊ |
| 901 | png_handle_pHYs(png_ptr, info_ptr, length);␍␊ |
| 902 | #endif␍␊ |
| 903 | ␍␊ |
| 904 | #ifdef PNG_READ_sBIT_SUPPORTED␍␊ |
| 905 | else if (chunk_name == png_sBIT)␍␊ |
| 906 | png_handle_sBIT(png_ptr, info_ptr, length);␍␊ |
| 907 | #endif␍␊ |
| 908 | ␍␊ |
| 909 | #ifdef PNG_READ_sRGB_SUPPORTED␍␊ |
| 910 | else if (chunk_name == png_sRGB)␍␊ |
| 911 | png_handle_sRGB(png_ptr, info_ptr, length);␍␊ |
| 912 | #endif␍␊ |
| 913 | ␍␊ |
| 914 | #ifdef PNG_READ_iCCP_SUPPORTED␍␊ |
| 915 | else if (chunk_name == png_iCCP)␍␊ |
| 916 | png_handle_iCCP(png_ptr, info_ptr, length);␍␊ |
| 917 | #endif␍␊ |
| 918 | ␍␊ |
| 919 | #ifdef PNG_READ_sPLT_SUPPORTED␍␊ |
| 920 | else if (chunk_name == png_sPLT)␍␊ |
| 921 | png_handle_sPLT(png_ptr, info_ptr, length);␍␊ |
| 922 | #endif␍␊ |
| 923 | ␍␊ |
| 924 | #ifdef PNG_READ_tEXt_SUPPORTED␍␊ |
| 925 | else if (chunk_name == png_tEXt)␍␊ |
| 926 | png_handle_tEXt(png_ptr, info_ptr, length);␍␊ |
| 927 | #endif␍␊ |
| 928 | ␍␊ |
| 929 | #ifdef PNG_READ_tIME_SUPPORTED␍␊ |
| 930 | else if (chunk_name == png_tIME)␍␊ |
| 931 | png_handle_tIME(png_ptr, info_ptr, length);␍␊ |
| 932 | #endif␍␊ |
| 933 | ␍␊ |
| 934 | #ifdef PNG_READ_tRNS_SUPPORTED␍␊ |
| 935 | else if (chunk_name == png_tRNS)␍␊ |
| 936 | png_handle_tRNS(png_ptr, info_ptr, length);␍␊ |
| 937 | #endif␍␊ |
| 938 | ␍␊ |
| 939 | #ifdef PNG_READ_zTXt_SUPPORTED␍␊ |
| 940 | else if (chunk_name == png_zTXt)␍␊ |
| 941 | png_handle_zTXt(png_ptr, info_ptr, length);␍␊ |
| 942 | #endif␍␊ |
| 943 | ␍␊ |
| 944 | #ifdef PNG_READ_iTXt_SUPPORTED␍␊ |
| 945 | else if (chunk_name == png_iTXt)␍␊ |
| 946 | png_handle_iTXt(png_ptr, info_ptr, length);␍␊ |
| 947 | #endif␍␊ |
| 948 | ␍␊ |
| 949 | else␍␊ |
| 950 | png_handle_unknown(png_ptr, info_ptr, length);␍␊ |
| 951 | } while (!(png_ptr->mode & PNG_HAVE_IEND));␍␊ |
| 952 | }␍␊ |
| 953 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */␍␊ |
| 954 | ␍␊ |
| 955 | /* Free all memory used by the read */␍␊ |
| 956 | void PNGAPI␍␊ |
| 957 | png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,␍␊ |
| 958 | png_infopp end_info_ptr_ptr)␍␊ |
| 959 | {␍␊ |
| 960 | png_structp png_ptr = NULL;␍␊ |
| 961 | png_infop info_ptr = NULL, end_info_ptr = NULL;␍␊ |
| 962 | #ifdef PNG_USER_MEM_SUPPORTED␍␊ |
| 963 | png_free_ptr free_fn = NULL;␍␊ |
| 964 | png_voidp mem_ptr = NULL;␍␊ |
| 965 | #endif␍␊ |
| 966 | ␍␊ |
| 967 | png_debug(1, "in png_destroy_read_struct");␍␊ |
| 968 | ␍␊ |
| 969 | if (png_ptr_ptr != NULL)␍␊ |
| 970 | png_ptr = *png_ptr_ptr;␍␊ |
| 971 | if (png_ptr == NULL)␍␊ |
| 972 | return;␍␊ |
| 973 | ␍␊ |
| 974 | #ifdef PNG_USER_MEM_SUPPORTED␍␊ |
| 975 | free_fn = png_ptr->free_fn;␍␊ |
| 976 | mem_ptr = png_ptr->mem_ptr;␍␊ |
| 977 | #endif␍␊ |
| 978 | ␍␊ |
| 979 | if (info_ptr_ptr != NULL)␍␊ |
| 980 | info_ptr = *info_ptr_ptr;␍␊ |
| 981 | ␍␊ |
| 982 | if (end_info_ptr_ptr != NULL)␍␊ |
| 983 | end_info_ptr = *end_info_ptr_ptr;␍␊ |
| 984 | ␍␊ |
| 985 | png_read_destroy(png_ptr, info_ptr, end_info_ptr);␍␊ |
| 986 | ␍␊ |
| 987 | if (info_ptr != NULL)␍␊ |
| 988 | {␍␊ |
| 989 | #ifdef PNG_TEXT_SUPPORTED␍␊ |
| 990 | png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);␍␊ |
| 991 | #endif␍␊ |
| 992 | ␍␊ |
| 993 | #ifdef PNG_USER_MEM_SUPPORTED␍␊ |
| 994 | png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,␍␊ |
| 995 | (png_voidp)mem_ptr);␍␊ |
| 996 | #else␍␊ |
| 997 | png_destroy_struct((png_voidp)info_ptr);␍␊ |
| 998 | #endif␍␊ |
| 999 | *info_ptr_ptr = NULL;␍␊ |
| 1000 | }␍␊ |
| 1001 | ␍␊ |
| 1002 | if (end_info_ptr != NULL)␍␊ |
| 1003 | {␍␊ |
| 1004 | #ifdef PNG_READ_TEXT_SUPPORTED␍␊ |
| 1005 | png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);␍␊ |
| 1006 | #endif␍␊ |
| 1007 | #ifdef PNG_USER_MEM_SUPPORTED␍␊ |
| 1008 | png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn,␍␊ |
| 1009 | (png_voidp)mem_ptr);␍␊ |
| 1010 | #else␍␊ |
| 1011 | png_destroy_struct((png_voidp)end_info_ptr);␍␊ |
| 1012 | #endif␍␊ |
| 1013 | *end_info_ptr_ptr = NULL;␍␊ |
| 1014 | }␍␊ |
| 1015 | ␍␊ |
| 1016 | if (png_ptr != NULL)␍␊ |
| 1017 | {␍␊ |
| 1018 | #ifdef PNG_USER_MEM_SUPPORTED␍␊ |
| 1019 | png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,␍␊ |
| 1020 | (png_voidp)mem_ptr);␍␊ |
| 1021 | #else␍␊ |
| 1022 | png_destroy_struct((png_voidp)png_ptr);␍␊ |
| 1023 | #endif␍␊ |
| 1024 | *png_ptr_ptr = NULL;␍␊ |
| 1025 | }␍␊ |
| 1026 | }␍␊ |
| 1027 | ␍␊ |
| 1028 | /* Free all memory used by the read (old method) */␍␊ |
| 1029 | void /* PRIVATE */␍␊ |
| 1030 | png_read_destroy(png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1031 | png_infop end_info_ptr)␍␊ |
| 1032 | {␍␊ |
| 1033 | #ifdef PNG_SETJMP_SUPPORTED␍␊ |
| 1034 | jmp_buf tmp_jmp;␍␊ |
| 1035 | #endif␍␊ |
| 1036 | png_error_ptr error_fn;␍␊ |
| 1037 | #ifdef PNG_WARNINGS_SUPPORTED␍␊ |
| 1038 | png_error_ptr warning_fn;␍␊ |
| 1039 | #endif␍␊ |
| 1040 | png_voidp error_ptr;␍␊ |
| 1041 | #ifdef PNG_USER_MEM_SUPPORTED␍␊ |
| 1042 | png_free_ptr free_fn;␍␊ |
| 1043 | #endif␍␊ |
| 1044 | ␍␊ |
| 1045 | png_debug(1, "in png_read_destroy");␍␊ |
| 1046 | ␍␊ |
| 1047 | if (info_ptr != NULL)␍␊ |
| 1048 | png_info_destroy(png_ptr, info_ptr);␍␊ |
| 1049 | ␍␊ |
| 1050 | if (end_info_ptr != NULL)␍␊ |
| 1051 | png_info_destroy(png_ptr, end_info_ptr);␍␊ |
| 1052 | ␍␊ |
| 1053 | #ifdef PNG_READ_GAMMA_SUPPORTED␍␊ |
| 1054 | png_destroy_gamma_table(png_ptr);␍␊ |
| 1055 | #endif␍␊ |
| 1056 | ␍␊ |
| 1057 | png_free(png_ptr, png_ptr->zbuf);␍␊ |
| 1058 | png_free(png_ptr, png_ptr->big_row_buf);␍␊ |
| 1059 | png_free(png_ptr, png_ptr->big_prev_row);␍␊ |
| 1060 | png_free(png_ptr, png_ptr->chunkdata);␍␊ |
| 1061 | ␍␊ |
| 1062 | #ifdef PNG_READ_QUANTIZE_SUPPORTED␍␊ |
| 1063 | png_free(png_ptr, png_ptr->palette_lookup);␍␊ |
| 1064 | png_free(png_ptr, png_ptr->quantize_index);␍␊ |
| 1065 | #endif␍␊ |
| 1066 | ␍␊ |
| 1067 | if (png_ptr->free_me & PNG_FREE_PLTE)␍␊ |
| 1068 | png_zfree(png_ptr, png_ptr->palette);␍␊ |
| 1069 | png_ptr->free_me &= ~PNG_FREE_PLTE;␍␊ |
| 1070 | ␍␊ |
| 1071 | #if defined(PNG_tRNS_SUPPORTED) || \␍␊ |
| 1072 | defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)␍␊ |
| 1073 | if (png_ptr->free_me & PNG_FREE_TRNS)␍␊ |
| 1074 | png_free(png_ptr, png_ptr->trans_alpha);␍␊ |
| 1075 | png_ptr->free_me &= ~PNG_FREE_TRNS;␍␊ |
| 1076 | #endif␍␊ |
| 1077 | ␍␊ |
| 1078 | #ifdef PNG_READ_hIST_SUPPORTED␍␊ |
| 1079 | if (png_ptr->free_me & PNG_FREE_HIST)␍␊ |
| 1080 | png_free(png_ptr, png_ptr->hist);␍␊ |
| 1081 | png_ptr->free_me &= ~PNG_FREE_HIST;␍␊ |
| 1082 | #endif␍␊ |
| 1083 | ␍␊ |
| 1084 | #if 1␍␊ |
| 1085 | inflateEnd(&png_ptr->zstream);␍␊ |
| 1086 | ␍␊ |
| 1087 | #else␍␊ |
| 1088 | execut_hook("inflateEnd", &png_ptr->zstream, NULL, NULL, NULL, NULL, NULL );␍␊ |
| 1089 | #endif␍␊ |
| 1090 | ␍␊ |
| 1091 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED␍␊ |
| 1092 | png_free(png_ptr, png_ptr->save_buffer);␍␊ |
| 1093 | #endif␍␊ |
| 1094 | ␍␊ |
| 1095 | /* Save the important info out of the png_struct, in case it is␍␊ |
| 1096 | * being used again.␍␊ |
| 1097 | */␍␊ |
| 1098 | #ifdef PNG_SETJMP_SUPPORTED␍␊ |
| 1099 | png_memcpy(tmp_jmp, png_ptr->longjmp_buffer, png_sizeof(jmp_buf));␍␊ |
| 1100 | #endif␍␊ |
| 1101 | ␍␊ |
| 1102 | error_fn = png_ptr->error_fn;␍␊ |
| 1103 | #ifdef PNG_WARNINGS_SUPPORTED␍␊ |
| 1104 | warning_fn = png_ptr->warning_fn;␍␊ |
| 1105 | #endif␍␊ |
| 1106 | error_ptr = png_ptr->error_ptr;␍␊ |
| 1107 | #ifdef PNG_USER_MEM_SUPPORTED␍␊ |
| 1108 | free_fn = png_ptr->free_fn;␍␊ |
| 1109 | #endif␍␊ |
| 1110 | ␍␊ |
| 1111 | png_memset(png_ptr, 0, png_sizeof(png_struct));␍␊ |
| 1112 | ␍␊ |
| 1113 | png_ptr->error_fn = error_fn;␍␊ |
| 1114 | #ifdef PNG_WARNINGS_SUPPORTED␍␊ |
| 1115 | png_ptr->warning_fn = warning_fn;␍␊ |
| 1116 | #endif␍␊ |
| 1117 | png_ptr->error_ptr = error_ptr;␍␊ |
| 1118 | #ifdef PNG_USER_MEM_SUPPORTED␍␊ |
| 1119 | png_ptr->free_fn = free_fn;␍␊ |
| 1120 | #endif␍␊ |
| 1121 | ␍␊ |
| 1122 | #ifdef PNG_SETJMP_SUPPORTED␍␊ |
| 1123 | png_memcpy(png_ptr->longjmp_buffer, tmp_jmp, png_sizeof(jmp_buf));␍␊ |
| 1124 | #endif␍␊ |
| 1125 | ␍␊ |
| 1126 | }␍␊ |
| 1127 | ␍␊ |
| 1128 | void PNGAPI␍␊ |
| 1129 | png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)␍␊ |
| 1130 | {␍␊ |
| 1131 | if (png_ptr == NULL)␍␊ |
| 1132 | return;␍␊ |
| 1133 | ␍␊ |
| 1134 | png_ptr->read_row_fn = read_row_fn;␍␊ |
| 1135 | }␍␊ |
| 1136 | ␍␊ |
| 1137 | ␍␊ |
| 1138 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED␍␊ |
| 1139 | #ifdef PNG_INFO_IMAGE_SUPPORTED␍␊ |
| 1140 | void PNGAPI␍␊ |
| 1141 | png_read_png(png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1142 | int transforms,␍␊ |
| 1143 | voidp params)␍␊ |
| 1144 | {␍␊ |
| 1145 | int row;␍␊ |
| 1146 | ␍␊ |
| 1147 | if (png_ptr == NULL || info_ptr == NULL)␍␊ |
| 1148 | return;␍␊ |
| 1149 | ␍␊ |
| 1150 | /* png_read_info() gives us all of the information from the␍␊ |
| 1151 | * PNG file before the first IDAT (image data chunk).␍␊ |
| 1152 | */␍␊ |
| 1153 | png_read_info(png_ptr, info_ptr);␍␊ |
| 1154 | if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep))␍␊ |
| 1155 | png_error(png_ptr, "Image is too high to process with png_read_png()");␍␊ |
| 1156 | ␍␊ |
| 1157 | /* -------------- image transformations start here ------------------- */␍␊ |
| 1158 | ␍␊ |
| 1159 | #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED␍␊ |
| 1160 | /* Tell libpng to strip 16-bit/color files down to 8 bits per color.␍␊ |
| 1161 | */␍␊ |
| 1162 | if (transforms & PNG_TRANSFORM_SCALE_16)␍␊ |
| 1163 | {␍␊ |
| 1164 | /* Added at libpng-1.5.4. "strip_16" produces the same result that it␍␊ |
| 1165 | * did in earlier versions, while "scale_16" is now more accurate.␍␊ |
| 1166 | */␍␊ |
| 1167 | png_set_scale_16(png_ptr);␍␊ |
| 1168 | }␍␊ |
| 1169 | #endif␍␊ |
| 1170 | ␍␊ |
| 1171 | #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED␍␊ |
| 1172 | /* If both SCALE and STRIP are required pngrtran will effectively cancel the␍␊ |
| 1173 | * latter by doing SCALE first. This is ok and allows apps not to check for␍␊ |
| 1174 | * which is supported to get the right answer.␍␊ |
| 1175 | */␍␊ |
| 1176 | if (transforms & PNG_TRANSFORM_STRIP_16)␍␊ |
| 1177 | png_set_strip_16(png_ptr);␍␊ |
| 1178 | #endif␍␊ |
| 1179 | ␍␊ |
| 1180 | #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED␍␊ |
| 1181 | /* Strip alpha bytes from the input data without combining with␍␊ |
| 1182 | * the background (not recommended).␍␊ |
| 1183 | */␍␊ |
| 1184 | if (transforms & PNG_TRANSFORM_STRIP_ALPHA)␍␊ |
| 1185 | png_set_strip_alpha(png_ptr);␍␊ |
| 1186 | #endif␍␊ |
| 1187 | ␍␊ |
| 1188 | #if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)␍␊ |
| 1189 | /* Extract multiple pixels with bit depths of 1, 2, or 4 from a single␍␊ |
| 1190 | * byte into separate bytes (useful for paletted and grayscale images).␍␊ |
| 1191 | */␍␊ |
| 1192 | if (transforms & PNG_TRANSFORM_PACKING)␍␊ |
| 1193 | png_set_packing(png_ptr);␍␊ |
| 1194 | #endif␍␊ |
| 1195 | ␍␊ |
| 1196 | #ifdef PNG_READ_PACKSWAP_SUPPORTED␍␊ |
| 1197 | /* Change the order of packed pixels to least significant bit first␍␊ |
| 1198 | * (not useful if you are using png_set_packing).␍␊ |
| 1199 | */␍␊ |
| 1200 | if (transforms & PNG_TRANSFORM_PACKSWAP)␍␊ |
| 1201 | png_set_packswap(png_ptr);␍␊ |
| 1202 | #endif␍␊ |
| 1203 | ␍␊ |
| 1204 | #ifdef PNG_READ_EXPAND_SUPPORTED␍␊ |
| 1205 | /* Expand paletted colors into true RGB triplets␍␊ |
| 1206 | * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel␍␊ |
| 1207 | * Expand paletted or RGB images with transparency to full alpha␍␊ |
| 1208 | * channels so the data will be available as RGBA quartets.␍␊ |
| 1209 | */␍␊ |
| 1210 | if (transforms & PNG_TRANSFORM_EXPAND)␍␊ |
| 1211 | if ((png_ptr->bit_depth < 8) ||␍␊ |
| 1212 | (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||␍␊ |
| 1213 | (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))␍␊ |
| 1214 | png_set_expand(png_ptr);␍␊ |
| 1215 | #endif␍␊ |
| 1216 | ␍␊ |
| 1217 | /* We don't handle background color or gamma transformation or quantizing.␍␊ |
| 1218 | */␍␊ |
| 1219 | ␍␊ |
| 1220 | #ifdef PNG_READ_INVERT_SUPPORTED␍␊ |
| 1221 | /* Invert monochrome files to have 0 as white and 1 as black␍␊ |
| 1222 | */␍␊ |
| 1223 | if (transforms & PNG_TRANSFORM_INVERT_MONO)␍␊ |
| 1224 | png_set_invert_mono(png_ptr);␍␊ |
| 1225 | #endif␍␊ |
| 1226 | ␍␊ |
| 1227 | #ifdef PNG_READ_SHIFT_SUPPORTED␍␊ |
| 1228 | /* If you want to shift the pixel values from the range [0,255] or␍␊ |
| 1229 | * [0,65535] to the original [0,7] or [0,31], or whatever range the␍␊ |
| 1230 | * colors were originally in:␍␊ |
| 1231 | */␍␊ |
| 1232 | if ((transforms & PNG_TRANSFORM_SHIFT)␍␊ |
| 1233 | && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))␍␊ |
| 1234 | {␍␊ |
| 1235 | png_color_8p sig_bit;␍␊ |
| 1236 | ␍␊ |
| 1237 | png_get_sBIT(png_ptr, info_ptr, &sig_bit);␍␊ |
| 1238 | png_set_shift(png_ptr, sig_bit);␍␊ |
| 1239 | }␍␊ |
| 1240 | #endif␍␊ |
| 1241 | ␍␊ |
| 1242 | #ifdef PNG_READ_BGR_SUPPORTED␍␊ |
| 1243 | /* Flip the RGB pixels to BGR (or RGBA to BGRA) */␍␊ |
| 1244 | if (transforms & PNG_TRANSFORM_BGR)␍␊ |
| 1245 | png_set_bgr(png_ptr);␍␊ |
| 1246 | #endif␍␊ |
| 1247 | ␍␊ |
| 1248 | #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED␍␊ |
| 1249 | /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */␍␊ |
| 1250 | if (transforms & PNG_TRANSFORM_SWAP_ALPHA)␍␊ |
| 1251 | png_set_swap_alpha(png_ptr);␍␊ |
| 1252 | #endif␍␊ |
| 1253 | ␍␊ |
| 1254 | #ifdef PNG_READ_SWAP_SUPPORTED␍␊ |
| 1255 | /* Swap bytes of 16-bit files to least significant byte first */␍␊ |
| 1256 | if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)␍␊ |
| 1257 | png_set_swap(png_ptr);␍␊ |
| 1258 | #endif␍␊ |
| 1259 | ␍␊ |
| 1260 | /* Added at libpng-1.2.41 */␍␊ |
| 1261 | #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED␍␊ |
| 1262 | /* Invert the alpha channel from opacity to transparency */␍␊ |
| 1263 | if (transforms & PNG_TRANSFORM_INVERT_ALPHA)␍␊ |
| 1264 | png_set_invert_alpha(png_ptr);␍␊ |
| 1265 | #endif␍␊ |
| 1266 | ␍␊ |
| 1267 | /* Added at libpng-1.2.41 */␍␊ |
| 1268 | #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED␍␊ |
| 1269 | /* Expand grayscale image to RGB */␍␊ |
| 1270 | if (transforms & PNG_TRANSFORM_GRAY_TO_RGB)␍␊ |
| 1271 | png_set_gray_to_rgb(png_ptr);␍␊ |
| 1272 | #endif␍␊ |
| 1273 | ␍␊ |
| 1274 | /* Added at libpng-1.5.4 */␍␊ |
| 1275 | #ifdef PNG_READ_EXPAND_16_SUPPORTED␍␊ |
| 1276 | if (transforms & PNG_TRANSFORM_EXPAND_16)␍␊ |
| 1277 | png_set_expand_16(png_ptr);␍␊ |
| 1278 | #endif␍␊ |
| 1279 | ␍␊ |
| 1280 | /* We don't handle adding filler bytes */␍␊ |
| 1281 | ␍␊ |
| 1282 | /* We use png_read_image and rely on that for interlace handling, but we also␍␊ |
| 1283 | * call png_read_update_info therefore must turn on interlace handling now:␍␊ |
| 1284 | */␍␊ |
| 1285 | (void)png_set_interlace_handling(png_ptr);␍␊ |
| 1286 | ␍␊ |
| 1287 | /* Optional call to gamma correct and add the background to the palette␍␊ |
| 1288 | * and update info structure. REQUIRED if you are expecting libpng to␍␊ |
| 1289 | * update the palette for you (i.e., you selected such a transform above).␍␊ |
| 1290 | */␍␊ |
| 1291 | png_read_update_info(png_ptr, info_ptr);␍␊ |
| 1292 | ␍␊ |
| 1293 | /* -------------- image transformations end here ------------------- */␍␊ |
| 1294 | ␍␊ |
| 1295 | png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);␍␊ |
| 1296 | if (info_ptr->row_pointers == NULL)␍␊ |
| 1297 | {␍␊ |
| 1298 | png_uint_32 iptr;␍␊ |
| 1299 | ␍␊ |
| 1300 | info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,␍␊ |
| 1301 | info_ptr->height * png_sizeof(png_bytep));␍␊ |
| 1302 | for (iptr=0; iptr<info_ptr->height; iptr++)␍␊ |
| 1303 | info_ptr->row_pointers[iptr] = NULL;␍␊ |
| 1304 | ␍␊ |
| 1305 | info_ptr->free_me |= PNG_FREE_ROWS;␍␊ |
| 1306 | ␍␊ |
| 1307 | for (row = 0; row < (int)info_ptr->height; row++)␍␊ |
| 1308 | info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,␍␊ |
| 1309 | png_get_rowbytes(png_ptr, info_ptr));␍␊ |
| 1310 | }␍␊ |
| 1311 | ␍␊ |
| 1312 | png_read_image(png_ptr, info_ptr->row_pointers);␍␊ |
| 1313 | info_ptr->valid |= PNG_INFO_IDAT;␍␊ |
| 1314 | ␍␊ |
| 1315 | /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */␍␊ |
| 1316 | png_read_end(png_ptr, info_ptr);␍␊ |
| 1317 | ␍␊ |
| 1318 | PNG_UNUSED(transforms) /* Quiet compiler warnings */␍␊ |
| 1319 | PNG_UNUSED(params)␍␊ |
| 1320 | ␍␊ |
| 1321 | }␍␊ |
| 1322 | #endif /* PNG_INFO_IMAGE_SUPPORTED */␍␊ |
| 1323 | #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */␍␊ |
| 1324 | #endif /* PNG_READ_SUPPORTED */␍␊ |
| 1325 | |
