| 1 | |
| 2 | /* pngget.c - retrieval of values from info struct |
| 3 | * |
| 4 | * libpng 1.2.7 - September 12, 2004 |
| 5 | * For conditions of distribution and use, see copyright notice in png.h |
| 6 | * Copyright (c) 1998-2004 Glenn Randers-Pehrson |
| 7 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 8 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
| 9 | */ |
| 10 | |
| 11 | #define PNG_INTERNAL |
| 12 | #include "png.h" |
| 13 | |
| 14 | png_uint_32 PNGAPI |
| 15 | png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag) |
| 16 | { |
| 17 | if (png_ptr != NULL && info_ptr != NULL) |
| 18 | return(info_ptr->valid & flag); |
| 19 | else |
| 20 | return(0); |
| 21 | } |
| 22 | |
| 23 | png_uint_32 PNGAPI |
| 24 | png_get_rowbytes(png_structp png_ptr, png_infop info_ptr) |
| 25 | { |
| 26 | if (png_ptr != NULL && info_ptr != NULL) |
| 27 | return(info_ptr->rowbytes); |
| 28 | else |
| 29 | return(0); |
| 30 | } |
| 31 | |
| 32 | #if defined(PNG_INFO_IMAGE_SUPPORTED) |
| 33 | png_bytepp PNGAPI |
| 34 | png_get_rows(png_structp png_ptr, png_infop info_ptr) |
| 35 | { |
| 36 | if (png_ptr != NULL && info_ptr != NULL) |
| 37 | return(info_ptr->row_pointers); |
| 38 | else |
| 39 | return(0); |
| 40 | } |
| 41 | #endif |
| 42 | |
| 43 | #ifdef PNG_EASY_ACCESS_SUPPORTED |
| 44 | /* easy access to info, added in libpng-0.99 */ |
| 45 | png_uint_32 PNGAPI |
| 46 | png_get_image_width(png_structp png_ptr, png_infop info_ptr) |
| 47 | { |
| 48 | if (png_ptr != NULL && info_ptr != NULL) |
| 49 | { |
| 50 | return info_ptr->width; |
| 51 | } |
| 52 | return (0); |
| 53 | } |
| 54 | |
| 55 | png_uint_32 PNGAPI |
| 56 | png_get_image_height(png_structp png_ptr, png_infop info_ptr) |
| 57 | { |
| 58 | if (png_ptr != NULL && info_ptr != NULL) |
| 59 | { |
| 60 | return info_ptr->height; |
| 61 | } |
| 62 | return (0); |
| 63 | } |
| 64 | |
| 65 | png_byte PNGAPI |
| 66 | png_get_bit_depth(png_structp png_ptr, png_infop info_ptr) |
| 67 | { |
| 68 | if (png_ptr != NULL && info_ptr != NULL) |
| 69 | { |
| 70 | return info_ptr->bit_depth; |
| 71 | } |
| 72 | return (0); |
| 73 | } |
| 74 | |
| 75 | png_byte PNGAPI |
| 76 | png_get_color_type(png_structp png_ptr, png_infop info_ptr) |
| 77 | { |
| 78 | if (png_ptr != NULL && info_ptr != NULL) |
| 79 | { |
| 80 | return info_ptr->color_type; |
| 81 | } |
| 82 | return (0); |
| 83 | } |
| 84 | |
| 85 | png_byte PNGAPI |
| 86 | png_get_filter_type(png_structp png_ptr, png_infop info_ptr) |
| 87 | { |
| 88 | if (png_ptr != NULL && info_ptr != NULL) |
| 89 | { |
| 90 | return info_ptr->filter_type; |
| 91 | } |
| 92 | return (0); |
| 93 | } |
| 94 | |
| 95 | png_byte PNGAPI |
| 96 | png_get_interlace_type(png_structp png_ptr, png_infop info_ptr) |
| 97 | { |
| 98 | if (png_ptr != NULL && info_ptr != NULL) |
| 99 | { |
| 100 | return info_ptr->interlace_type; |
| 101 | } |
| 102 | return (0); |
| 103 | } |
| 104 | |
| 105 | png_byte PNGAPI |
| 106 | png_get_compression_type(png_structp png_ptr, png_infop info_ptr) |
| 107 | { |
| 108 | if (png_ptr != NULL && info_ptr != NULL) |
| 109 | { |
| 110 | return info_ptr->compression_type; |
| 111 | } |
| 112 | return (0); |
| 113 | } |
| 114 | |
| 115 | png_uint_32 PNGAPI |
| 116 | png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr) |
| 117 | { |
| 118 | if (png_ptr != NULL && info_ptr != NULL) |
| 119 | #if defined(PNG_pHYs_SUPPORTED) |
| 120 | if (info_ptr->valid & PNG_INFO_pHYs) |
| 121 | { |
| 122 | png_debug1(1, "in %s retrieval function\n", "png_get_x_pixels_per_meter"); |
| 123 | if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER) |
| 124 | return (0); |
| 125 | else return (info_ptr->x_pixels_per_unit); |
| 126 | } |
| 127 | #else |
| 128 | return (0); |
| 129 | #endif |
| 130 | return (0); |
| 131 | } |
| 132 | |
| 133 | png_uint_32 PNGAPI |
| 134 | png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr) |
| 135 | { |
| 136 | if (png_ptr != NULL && info_ptr != NULL) |
| 137 | #if defined(PNG_pHYs_SUPPORTED) |
| 138 | if (info_ptr->valid & PNG_INFO_pHYs) |
| 139 | { |
| 140 | png_debug1(1, "in %s retrieval function\n", "png_get_y_pixels_per_meter"); |
| 141 | if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER) |
| 142 | return (0); |
| 143 | else return (info_ptr->y_pixels_per_unit); |
| 144 | } |
| 145 | #else |
| 146 | return (0); |
| 147 | #endif |
| 148 | return (0); |
| 149 | } |
| 150 | |
| 151 | png_uint_32 PNGAPI |
| 152 | png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr) |
| 153 | { |
| 154 | if (png_ptr != NULL && info_ptr != NULL) |
| 155 | #if defined(PNG_pHYs_SUPPORTED) |
| 156 | if (info_ptr->valid & PNG_INFO_pHYs) |
| 157 | { |
| 158 | png_debug1(1, "in %s retrieval function\n", "png_get_pixels_per_meter"); |
| 159 | if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER || |
| 160 | info_ptr->x_pixels_per_unit != info_ptr->y_pixels_per_unit) |
| 161 | return (0); |
| 162 | else return (info_ptr->x_pixels_per_unit); |
| 163 | } |
| 164 | #else |
| 165 | return (0); |
| 166 | #endif |
| 167 | return (0); |
| 168 | } |
| 169 | |
| 170 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 171 | float PNGAPI |
| 172 | png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr) |
| 173 | { |
| 174 | if (png_ptr != NULL && info_ptr != NULL) |
| 175 | #if defined(PNG_pHYs_SUPPORTED) |
| 176 | if (info_ptr->valid & PNG_INFO_pHYs) |
| 177 | { |
| 178 | png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio"); |
| 179 | if (info_ptr->x_pixels_per_unit == 0) |
| 180 | return ((float)0.0); |
| 181 | else |
| 182 | return ((float)((float)info_ptr->y_pixels_per_unit |
| 183 | /(float)info_ptr->x_pixels_per_unit)); |
| 184 | } |
| 185 | #else |
| 186 | return (0.0); |
| 187 | #endif |
| 188 | return ((float)0.0); |
| 189 | } |
| 190 | #endif |
| 191 | |
| 192 | png_int_32 PNGAPI |
| 193 | png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr) |
| 194 | { |
| 195 | if (png_ptr != NULL && info_ptr != NULL) |
| 196 | #if defined(PNG_oFFs_SUPPORTED) |
| 197 | if (info_ptr->valid & PNG_INFO_oFFs) |
| 198 | { |
| 199 | png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns"); |
| 200 | if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER) |
| 201 | return (0); |
| 202 | else return (info_ptr->x_offset); |
| 203 | } |
| 204 | #else |
| 205 | return (0); |
| 206 | #endif |
| 207 | return (0); |
| 208 | } |
| 209 | |
| 210 | png_int_32 PNGAPI |
| 211 | png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr) |
| 212 | { |
| 213 | if (png_ptr != NULL && info_ptr != NULL) |
| 214 | #if defined(PNG_oFFs_SUPPORTED) |
| 215 | if (info_ptr->valid & PNG_INFO_oFFs) |
| 216 | { |
| 217 | png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns"); |
| 218 | if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER) |
| 219 | return (0); |
| 220 | else return (info_ptr->y_offset); |
| 221 | } |
| 222 | #else |
| 223 | return (0); |
| 224 | #endif |
| 225 | return (0); |
| 226 | } |
| 227 | |
| 228 | png_int_32 PNGAPI |
| 229 | png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr) |
| 230 | { |
| 231 | if (png_ptr != NULL && info_ptr != NULL) |
| 232 | #if defined(PNG_oFFs_SUPPORTED) |
| 233 | if (info_ptr->valid & PNG_INFO_oFFs) |
| 234 | { |
| 235 | png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns"); |
| 236 | if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL) |
| 237 | return (0); |
| 238 | else return (info_ptr->x_offset); |
| 239 | } |
| 240 | #else |
| 241 | return (0); |
| 242 | #endif |
| 243 | return (0); |
| 244 | } |
| 245 | |
| 246 | png_int_32 PNGAPI |
| 247 | png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr) |
| 248 | { |
| 249 | if (png_ptr != NULL && info_ptr != NULL) |
| 250 | #if defined(PNG_oFFs_SUPPORTED) |
| 251 | if (info_ptr->valid & PNG_INFO_oFFs) |
| 252 | { |
| 253 | png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns"); |
| 254 | if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL) |
| 255 | return (0); |
| 256 | else return (info_ptr->y_offset); |
| 257 | } |
| 258 | #else |
| 259 | return (0); |
| 260 | #endif |
| 261 | return (0); |
| 262 | } |
| 263 | |
| 264 | #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) |
| 265 | png_uint_32 PNGAPI |
| 266 | png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr) |
| 267 | { |
| 268 | return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr) |
| 269 | *.0254 +.5)); |
| 270 | } |
| 271 | |
| 272 | png_uint_32 PNGAPI |
| 273 | png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr) |
| 274 | { |
| 275 | return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr) |
| 276 | *.0254 +.5)); |
| 277 | } |
| 278 | |
| 279 | png_uint_32 PNGAPI |
| 280 | png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr) |
| 281 | { |
| 282 | return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr) |
| 283 | *.0254 +.5)); |
| 284 | } |
| 285 | |
| 286 | float PNGAPI |
| 287 | png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr) |
| 288 | { |
| 289 | return ((float)png_get_x_offset_microns(png_ptr, info_ptr) |
| 290 | *.00003937); |
| 291 | } |
| 292 | |
| 293 | float PNGAPI |
| 294 | png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr) |
| 295 | { |
| 296 | return ((float)png_get_y_offset_microns(png_ptr, info_ptr) |
| 297 | *.00003937); |
| 298 | } |
| 299 | |
| 300 | #if defined(PNG_pHYs_SUPPORTED) |
| 301 | png_uint_32 PNGAPI |
| 302 | png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr, |
| 303 | png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) |
| 304 | { |
| 305 | png_uint_32 retval = 0; |
| 306 | |
| 307 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) |
| 308 | { |
| 309 | png_debug1(1, "in %s retrieval function\n", "pHYs"); |
| 310 | if (res_x != NULL) |
| 311 | { |
| 312 | *res_x = info_ptr->x_pixels_per_unit; |
| 313 | retval |= PNG_INFO_pHYs; |
| 314 | } |
| 315 | if (res_y != NULL) |
| 316 | { |
| 317 | *res_y = info_ptr->y_pixels_per_unit; |
| 318 | retval |= PNG_INFO_pHYs; |
| 319 | } |
| 320 | if (unit_type != NULL) |
| 321 | { |
| 322 | *unit_type = (int)info_ptr->phys_unit_type; |
| 323 | retval |= PNG_INFO_pHYs; |
| 324 | if(*unit_type == 1) |
| 325 | { |
| 326 | if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50); |
| 327 | if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50); |
| 328 | } |
| 329 | } |
| 330 | } |
| 331 | return (retval); |
| 332 | } |
| 333 | #endif /* PNG_pHYs_SUPPORTED */ |
| 334 | #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ |
| 335 | |
| 336 | /* png_get_channels really belongs in here, too, but it's been around longer */ |
| 337 | |
| 338 | #endif /* PNG_EASY_ACCESS_SUPPORTED */ |
| 339 | |
| 340 | png_byte PNGAPI |
| 341 | png_get_channels(png_structp png_ptr, png_infop info_ptr) |
| 342 | { |
| 343 | if (png_ptr != NULL && info_ptr != NULL) |
| 344 | return(info_ptr->channels); |
| 345 | else |
| 346 | return (0); |
| 347 | } |
| 348 | |
| 349 | png_bytep PNGAPI |
| 350 | png_get_signature(png_structp png_ptr, png_infop info_ptr) |
| 351 | { |
| 352 | if (png_ptr != NULL && info_ptr != NULL) |
| 353 | return(info_ptr->signature); |
| 354 | else |
| 355 | return (NULL); |
| 356 | } |
| 357 | |
| 358 | #if defined(PNG_bKGD_SUPPORTED) |
| 359 | png_uint_32 PNGAPI |
| 360 | png_get_bKGD(png_structp png_ptr, png_infop info_ptr, |
| 361 | png_color_16p *background) |
| 362 | { |
| 363 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD) |
| 364 | && background != NULL) |
| 365 | { |
| 366 | png_debug1(1, "in %s retrieval function\n", "bKGD"); |
| 367 | *background = &(info_ptr->background); |
| 368 | return (PNG_INFO_bKGD); |
| 369 | } |
| 370 | return (0); |
| 371 | } |
| 372 | #endif |
| 373 | |
| 374 | #if defined(PNG_cHRM_SUPPORTED) |
| 375 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 376 | png_uint_32 PNGAPI |
| 377 | png_get_cHRM(png_structp png_ptr, png_infop info_ptr, |
| 378 | double *white_x, double *white_y, double *red_x, double *red_y, |
| 379 | double *green_x, double *green_y, double *blue_x, double *blue_y) |
| 380 | { |
| 381 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) |
| 382 | { |
| 383 | png_debug1(1, "in %s retrieval function\n", "cHRM"); |
| 384 | if (white_x != NULL) |
| 385 | *white_x = (double)info_ptr->x_white; |
| 386 | if (white_y != NULL) |
| 387 | *white_y = (double)info_ptr->y_white; |
| 388 | if (red_x != NULL) |
| 389 | *red_x = (double)info_ptr->x_red; |
| 390 | if (red_y != NULL) |
| 391 | *red_y = (double)info_ptr->y_red; |
| 392 | if (green_x != NULL) |
| 393 | *green_x = (double)info_ptr->x_green; |
| 394 | if (green_y != NULL) |
| 395 | *green_y = (double)info_ptr->y_green; |
| 396 | if (blue_x != NULL) |
| 397 | *blue_x = (double)info_ptr->x_blue; |
| 398 | if (blue_y != NULL) |
| 399 | *blue_y = (double)info_ptr->y_blue; |
| 400 | return (PNG_INFO_cHRM); |
| 401 | } |
| 402 | return (0); |
| 403 | } |
| 404 | #endif |
| 405 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 406 | png_uint_32 PNGAPI |
| 407 | png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr, |
| 408 | png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x, |
| 409 | png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y, |
| 410 | png_fixed_point *blue_x, png_fixed_point *blue_y) |
| 411 | { |
| 412 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) |
| 413 | { |
| 414 | png_debug1(1, "in %s retrieval function\n", "cHRM"); |
| 415 | if (white_x != NULL) |
| 416 | *white_x = info_ptr->int_x_white; |
| 417 | if (white_y != NULL) |
| 418 | *white_y = info_ptr->int_y_white; |
| 419 | if (red_x != NULL) |
| 420 | *red_x = info_ptr->int_x_red; |
| 421 | if (red_y != NULL) |
| 422 | *red_y = info_ptr->int_y_red; |
| 423 | if (green_x != NULL) |
| 424 | *green_x = info_ptr->int_x_green; |
| 425 | if (green_y != NULL) |
| 426 | *green_y = info_ptr->int_y_green; |
| 427 | if (blue_x != NULL) |
| 428 | *blue_x = info_ptr->int_x_blue; |
| 429 | if (blue_y != NULL) |
| 430 | *blue_y = info_ptr->int_y_blue; |
| 431 | return (PNG_INFO_cHRM); |
| 432 | } |
| 433 | return (0); |
| 434 | } |
| 435 | #endif |
| 436 | #endif |
| 437 | |
| 438 | #if defined(PNG_gAMA_SUPPORTED) |
| 439 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 440 | png_uint_32 PNGAPI |
| 441 | png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma) |
| 442 | { |
| 443 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) |
| 444 | && file_gamma != NULL) |
| 445 | { |
| 446 | png_debug1(1, "in %s retrieval function\n", "gAMA"); |
| 447 | *file_gamma = (double)info_ptr->gamma; |
| 448 | return (PNG_INFO_gAMA); |
| 449 | } |
| 450 | return (0); |
| 451 | } |
| 452 | #endif |
| 453 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 454 | png_uint_32 PNGAPI |
| 455 | png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, |
| 456 | png_fixed_point *int_file_gamma) |
| 457 | { |
| 458 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) |
| 459 | && int_file_gamma != NULL) |
| 460 | { |
| 461 | png_debug1(1, "in %s retrieval function\n", "gAMA"); |
| 462 | *int_file_gamma = info_ptr->int_gamma; |
| 463 | return (PNG_INFO_gAMA); |
| 464 | } |
| 465 | return (0); |
| 466 | } |
| 467 | #endif |
| 468 | #endif |
| 469 | |
| 470 | #if defined(PNG_sRGB_SUPPORTED) |
| 471 | png_uint_32 PNGAPI |
| 472 | png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent) |
| 473 | { |
| 474 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB) |
| 475 | && file_srgb_intent != NULL) |
| 476 | { |
| 477 | png_debug1(1, "in %s retrieval function\n", "sRGB"); |
| 478 | *file_srgb_intent = (int)info_ptr->srgb_intent; |
| 479 | return (PNG_INFO_sRGB); |
| 480 | } |
| 481 | return (0); |
| 482 | } |
| 483 | #endif |
| 484 | |
| 485 | #if defined(PNG_iCCP_SUPPORTED) |
| 486 | png_uint_32 PNGAPI |
| 487 | png_get_iCCP(png_structp png_ptr, png_infop info_ptr, |
| 488 | png_charpp name, int *compression_type, |
| 489 | png_charpp profile, png_uint_32 *proflen) |
| 490 | { |
| 491 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP) |
| 492 | && name != NULL && profile != NULL && proflen != NULL) |
| 493 | { |
| 494 | png_debug1(1, "in %s retrieval function\n", "iCCP"); |
| 495 | *name = info_ptr->iccp_name; |
| 496 | *profile = info_ptr->iccp_profile; |
| 497 | /* compression_type is a dummy so the API won't have to change |
| 498 | if we introduce multiple compression types later. */ |
| 499 | *proflen = (int)info_ptr->iccp_proflen; |
| 500 | *compression_type = (int)info_ptr->iccp_compression; |
| 501 | return (PNG_INFO_iCCP); |
| 502 | } |
| 503 | return (0); |
| 504 | } |
| 505 | #endif |
| 506 | |
| 507 | #if defined(PNG_sPLT_SUPPORTED) |
| 508 | png_uint_32 PNGAPI |
| 509 | png_get_sPLT(png_structp png_ptr, png_infop info_ptr, |
| 510 | png_sPLT_tpp spalettes) |
| 511 | { |
| 512 | if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL) |
| 513 | *spalettes = info_ptr->splt_palettes; |
| 514 | return ((png_uint_32)info_ptr->splt_palettes_num); |
| 515 | } |
| 516 | #endif |
| 517 | |
| 518 | #if defined(PNG_hIST_SUPPORTED) |
| 519 | png_uint_32 PNGAPI |
| 520 | png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist) |
| 521 | { |
| 522 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST) |
| 523 | && hist != NULL) |
| 524 | { |
| 525 | png_debug1(1, "in %s retrieval function\n", "hIST"); |
| 526 | *hist = info_ptr->hist; |
| 527 | return (PNG_INFO_hIST); |
| 528 | } |
| 529 | return (0); |
| 530 | } |
| 531 | #endif |
| 532 | |
| 533 | png_uint_32 PNGAPI |
| 534 | png_get_IHDR(png_structp png_ptr, png_infop info_ptr, |
| 535 | png_uint_32 *width, png_uint_32 *height, int *bit_depth, |
| 536 | int *color_type, int *interlace_type, int *compression_type, |
| 537 | int *filter_type) |
| 538 | |
| 539 | { |
| 540 | if (png_ptr != NULL && info_ptr != NULL && width != NULL && height != NULL && |
| 541 | bit_depth != NULL && color_type != NULL) |
| 542 | { |
| 543 | png_debug1(1, "in %s retrieval function\n", "IHDR"); |
| 544 | *width = info_ptr->width; |
| 545 | *height = info_ptr->height; |
| 546 | *bit_depth = info_ptr->bit_depth; |
| 547 | if (info_ptr->bit_depth < 1 || info_ptr->bit_depth > 16) |
| 548 | png_error(png_ptr, "Invalid bit depth"); |
| 549 | *color_type = info_ptr->color_type; |
| 550 | if (info_ptr->color_type > 6) |
| 551 | png_error(png_ptr, "Invalid color type"); |
| 552 | if (compression_type != NULL) |
| 553 | *compression_type = info_ptr->compression_type; |
| 554 | if (filter_type != NULL) |
| 555 | *filter_type = info_ptr->filter_type; |
| 556 | if (interlace_type != NULL) |
| 557 | *interlace_type = info_ptr->interlace_type; |
| 558 | |
| 559 | /* check for potential overflow of rowbytes */ |
| 560 | if (width == 0 || *width > PNG_UINT_31_MAX) |
| 561 | png_error(png_ptr, "Invalid image width"); |
| 562 | if (height == 0 || *height > PNG_UINT_31_MAX) |
| 563 | png_error(png_ptr, "Invalid image height"); |
| 564 | if (info_ptr->width > (PNG_UINT_32_MAX |
| 565 | >> 3) /* 8-byte RGBA pixels */ |
| 566 | - 64 /* bigrowbuf hack */ |
| 567 | - 1 /* filter byte */ |
| 568 | - 7*8 /* rounding of width to multiple of 8 pixels */ |
| 569 | - 8) /* extra max_pixel_depth pad */ |
| 570 | { |
| 571 | png_warning(png_ptr, |
| 572 | "Width too large for libpng to process image data."); |
| 573 | } |
| 574 | return (1); |
| 575 | } |
| 576 | return (0); |
| 577 | } |
| 578 | |
| 579 | #if defined(PNG_oFFs_SUPPORTED) |
| 580 | png_uint_32 PNGAPI |
| 581 | png_get_oFFs(png_structp png_ptr, png_infop info_ptr, |
| 582 | png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type) |
| 583 | { |
| 584 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs) |
| 585 | && offset_x != NULL && offset_y != NULL && unit_type != NULL) |
| 586 | { |
| 587 | png_debug1(1, "in %s retrieval function\n", "oFFs"); |
| 588 | *offset_x = info_ptr->x_offset; |
| 589 | *offset_y = info_ptr->y_offset; |
| 590 | *unit_type = (int)info_ptr->offset_unit_type; |
| 591 | return (PNG_INFO_oFFs); |
| 592 | } |
| 593 | return (0); |
| 594 | } |
| 595 | #endif |
| 596 | |
| 597 | #if defined(PNG_pCAL_SUPPORTED) |
| 598 | png_uint_32 PNGAPI |
| 599 | png_get_pCAL(png_structp png_ptr, png_infop info_ptr, |
| 600 | png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams, |
| 601 | png_charp *units, png_charpp *params) |
| 602 | { |
| 603 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL) |
| 604 | && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL && |
| 605 | nparams != NULL && units != NULL && params != NULL) |
| 606 | { |
| 607 | png_debug1(1, "in %s retrieval function\n", "pCAL"); |
| 608 | *purpose = info_ptr->pcal_purpose; |
| 609 | *X0 = info_ptr->pcal_X0; |
| 610 | *X1 = info_ptr->pcal_X1; |
| 611 | *type = (int)info_ptr->pcal_type; |
| 612 | *nparams = (int)info_ptr->pcal_nparams; |
| 613 | *units = info_ptr->pcal_units; |
| 614 | *params = info_ptr->pcal_params; |
| 615 | return (PNG_INFO_pCAL); |
| 616 | } |
| 617 | return (0); |
| 618 | } |
| 619 | #endif |
| 620 | |
| 621 | #if defined(PNG_sCAL_SUPPORTED) |
| 622 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 623 | png_uint_32 PNGAPI |
| 624 | png_get_sCAL(png_structp png_ptr, png_infop info_ptr, |
| 625 | int *unit, double *width, double *height) |
| 626 | { |
| 627 | if (png_ptr != NULL && info_ptr != NULL && |
| 628 | (info_ptr->valid & PNG_INFO_sCAL)) |
| 629 | { |
| 630 | *unit = info_ptr->scal_unit; |
| 631 | *width = info_ptr->scal_pixel_width; |
| 632 | *height = info_ptr->scal_pixel_height; |
| 633 | return (PNG_INFO_sCAL); |
| 634 | } |
| 635 | return(0); |
| 636 | } |
| 637 | #else |
| 638 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 639 | png_uint_32 PNGAPI |
| 640 | png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr, |
| 641 | int *unit, png_charpp width, png_charpp height) |
| 642 | { |
| 643 | if (png_ptr != NULL && info_ptr != NULL && |
| 644 | (info_ptr->valid & PNG_INFO_sCAL)) |
| 645 | { |
| 646 | *unit = info_ptr->scal_unit; |
| 647 | *width = info_ptr->scal_s_width; |
| 648 | *height = info_ptr->scal_s_height; |
| 649 | return (PNG_INFO_sCAL); |
| 650 | } |
| 651 | return(0); |
| 652 | } |
| 653 | #endif |
| 654 | #endif |
| 655 | #endif |
| 656 | |
| 657 | #if defined(PNG_pHYs_SUPPORTED) |
| 658 | png_uint_32 PNGAPI |
| 659 | png_get_pHYs(png_structp png_ptr, png_infop info_ptr, |
| 660 | png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) |
| 661 | { |
| 662 | png_uint_32 retval = 0; |
| 663 | |
| 664 | if (png_ptr != NULL && info_ptr != NULL && |
| 665 | (info_ptr->valid & PNG_INFO_pHYs)) |
| 666 | { |
| 667 | png_debug1(1, "in %s retrieval function\n", "pHYs"); |
| 668 | if (res_x != NULL) |
| 669 | { |
| 670 | *res_x = info_ptr->x_pixels_per_unit; |
| 671 | retval |= PNG_INFO_pHYs; |
| 672 | } |
| 673 | if (res_y != NULL) |
| 674 | { |
| 675 | *res_y = info_ptr->y_pixels_per_unit; |
| 676 | retval |= PNG_INFO_pHYs; |
| 677 | } |
| 678 | if (unit_type != NULL) |
| 679 | { |
| 680 | *unit_type = (int)info_ptr->phys_unit_type; |
| 681 | retval |= PNG_INFO_pHYs; |
| 682 | } |
| 683 | } |
| 684 | return (retval); |
| 685 | } |
| 686 | #endif |
| 687 | |
| 688 | png_uint_32 PNGAPI |
| 689 | png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette, |
| 690 | int *num_palette) |
| 691 | { |
| 692 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE) |
| 693 | && palette != NULL) |
| 694 | { |
| 695 | png_debug1(1, "in %s retrieval function\n", "PLTE"); |
| 696 | *palette = info_ptr->palette; |
| 697 | *num_palette = info_ptr->num_palette; |
| 698 | png_debug1(3, "num_palette = %d\n", *num_palette); |
| 699 | return (PNG_INFO_PLTE); |
| 700 | } |
| 701 | return (0); |
| 702 | } |
| 703 | |
| 704 | #if defined(PNG_sBIT_SUPPORTED) |
| 705 | png_uint_32 PNGAPI |
| 706 | png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit) |
| 707 | { |
| 708 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT) |
| 709 | && sig_bit != NULL) |
| 710 | { |
| 711 | png_debug1(1, "in %s retrieval function\n", "sBIT"); |
| 712 | *sig_bit = &(info_ptr->sig_bit); |
| 713 | return (PNG_INFO_sBIT); |
| 714 | } |
| 715 | return (0); |
| 716 | } |
| 717 | #endif |
| 718 | |
| 719 | #if defined(PNG_TEXT_SUPPORTED) |
| 720 | png_uint_32 PNGAPI |
| 721 | png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr, |
| 722 | int *num_text) |
| 723 | { |
| 724 | if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0) |
| 725 | { |
| 726 | png_debug1(1, "in %s retrieval function\n", |
| 727 | (png_ptr->chunk_name[0] == '\0' ? "text" |
| 728 | : (png_const_charp)png_ptr->chunk_name)); |
| 729 | if (text_ptr != NULL) |
| 730 | *text_ptr = info_ptr->text; |
| 731 | if (num_text != NULL) |
| 732 | *num_text = info_ptr->num_text; |
| 733 | return ((png_uint_32)info_ptr->num_text); |
| 734 | } |
| 735 | if (num_text != NULL) |
| 736 | *num_text = 0; |
| 737 | return(0); |
| 738 | } |
| 739 | #endif |
| 740 | |
| 741 | #if defined(PNG_tIME_SUPPORTED) |
| 742 | png_uint_32 PNGAPI |
| 743 | png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time) |
| 744 | { |
| 745 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME) |
| 746 | && mod_time != NULL) |
| 747 | { |
| 748 | png_debug1(1, "in %s retrieval function\n", "tIME"); |
| 749 | *mod_time = &(info_ptr->mod_time); |
| 750 | return (PNG_INFO_tIME); |
| 751 | } |
| 752 | return (0); |
| 753 | } |
| 754 | #endif |
| 755 | |
| 756 | #if defined(PNG_tRNS_SUPPORTED) |
| 757 | png_uint_32 PNGAPI |
| 758 | png_get_tRNS(png_structp png_ptr, png_infop info_ptr, |
| 759 | png_bytep *trans, int *num_trans, png_color_16p *trans_values) |
| 760 | { |
| 761 | png_uint_32 retval = 0; |
| 762 | if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) |
| 763 | { |
| 764 | png_debug1(1, "in %s retrieval function\n", "tRNS"); |
| 765 | if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) |
| 766 | { |
| 767 | if (trans != NULL) |
| 768 | { |
| 769 | *trans = info_ptr->trans; |
| 770 | retval |= PNG_INFO_tRNS; |
| 771 | } |
| 772 | if (trans_values != NULL) |
| 773 | *trans_values = &(info_ptr->trans_values); |
| 774 | } |
| 775 | else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */ |
| 776 | { |
| 777 | if (trans_values != NULL) |
| 778 | { |
| 779 | *trans_values = &(info_ptr->trans_values); |
| 780 | retval |= PNG_INFO_tRNS; |
| 781 | } |
| 782 | if(trans != NULL) |
| 783 | *trans = NULL; |
| 784 | } |
| 785 | if(num_trans != NULL) |
| 786 | { |
| 787 | *num_trans = info_ptr->num_trans; |
| 788 | retval |= PNG_INFO_tRNS; |
| 789 | } |
| 790 | } |
| 791 | return (retval); |
| 792 | } |
| 793 | #endif |
| 794 | |
| 795 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| 796 | png_uint_32 PNGAPI |
| 797 | png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr, |
| 798 | png_unknown_chunkpp unknowns) |
| 799 | { |
| 800 | if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL) |
| 801 | *unknowns = info_ptr->unknown_chunks; |
| 802 | return ((png_uint_32)info_ptr->unknown_chunks_num); |
| 803 | } |
| 804 | #endif |
| 805 | |
| 806 | #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
| 807 | png_byte PNGAPI |
| 808 | png_get_rgb_to_gray_status (png_structp png_ptr) |
| 809 | { |
| 810 | return (png_byte)(png_ptr? png_ptr->rgb_to_gray_status : 0); |
| 811 | } |
| 812 | #endif |
| 813 | |
| 814 | #if defined(PNG_USER_CHUNKS_SUPPORTED) |
| 815 | png_voidp PNGAPI |
| 816 | png_get_user_chunk_ptr(png_structp png_ptr) |
| 817 | { |
| 818 | return (png_ptr? png_ptr->user_chunk_ptr : NULL); |
| 819 | } |
| 820 | #endif |
| 821 | |
| 822 | #ifdef PNG_WRITE_SUPPORTED |
| 823 | png_uint_32 PNGAPI |
| 824 | png_get_compression_buffer_size(png_structp png_ptr) |
| 825 | { |
| 826 | return (png_uint_32)(png_ptr? png_ptr->zbuf_size : 0L); |
| 827 | } |
| 828 | #endif |
| 829 | |
| 830 | #ifndef PNG_1_0_X |
| 831 | #ifdef PNG_ASSEMBLER_CODE_SUPPORTED |
| 832 | /* this function was added to libpng 1.2.0 and should exist by default */ |
| 833 | png_uint_32 PNGAPI |
| 834 | png_get_asm_flags (png_structp png_ptr) |
| 835 | { |
| 836 | return (png_uint_32)(png_ptr? png_ptr->asm_flags : 0L); |
| 837 | } |
| 838 | |
| 839 | /* this function was added to libpng 1.2.0 and should exist by default */ |
| 840 | png_uint_32 PNGAPI |
| 841 | png_get_asm_flagmask (int flag_select) |
| 842 | { |
| 843 | png_uint_32 settable_asm_flags = 0; |
| 844 | |
| 845 | if (flag_select & PNG_SELECT_READ) |
| 846 | settable_asm_flags |= |
| 847 | PNG_ASM_FLAG_MMX_READ_COMBINE_ROW | |
| 848 | PNG_ASM_FLAG_MMX_READ_INTERLACE | |
| 849 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB | |
| 850 | PNG_ASM_FLAG_MMX_READ_FILTER_UP | |
| 851 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG | |
| 852 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ; |
| 853 | /* no non-MMX flags yet */ |
| 854 | |
| 855 | #if 0 |
| 856 | /* GRR: no write-flags yet, either, but someday... */ |
| 857 | if (flag_select & PNG_SELECT_WRITE) |
| 858 | settable_asm_flags |= |
| 859 | PNG_ASM_FLAG_MMX_WRITE_ [whatever] ; |
| 860 | #endif /* 0 */ |
| 861 | |
| 862 | return settable_asm_flags; /* _theoretically_ settable capabilities only */ |
| 863 | } |
| 864 | #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ |
| 865 | |
| 866 | |
| 867 | #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
| 868 | /* GRR: could add this: && defined(PNG_MMX_CODE_SUPPORTED) */ |
| 869 | /* this function was added to libpng 1.2.0 */ |
| 870 | png_uint_32 PNGAPI |
| 871 | png_get_mmx_flagmask (int flag_select, int *compilerID) |
| 872 | { |
| 873 | png_uint_32 settable_mmx_flags = 0; |
| 874 | |
| 875 | if (flag_select & PNG_SELECT_READ) |
| 876 | settable_mmx_flags |= |
| 877 | PNG_ASM_FLAG_MMX_READ_COMBINE_ROW | |
| 878 | PNG_ASM_FLAG_MMX_READ_INTERLACE | |
| 879 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB | |
| 880 | PNG_ASM_FLAG_MMX_READ_FILTER_UP | |
| 881 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG | |
| 882 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ; |
| 883 | #if 0 |
| 884 | /* GRR: no MMX write support yet, but someday... */ |
| 885 | if (flag_select & PNG_SELECT_WRITE) |
| 886 | settable_mmx_flags |= |
| 887 | PNG_ASM_FLAG_MMX_WRITE_ [whatever] ; |
| 888 | #endif /* 0 */ |
| 889 | |
| 890 | if (compilerID != NULL) { |
| 891 | #ifdef PNG_USE_PNGVCRD |
| 892 | *compilerID = 1; /* MSVC */ |
| 893 | #else |
| 894 | #ifdef PNG_USE_PNGGCCRD |
| 895 | *compilerID = 2; /* gcc/gas */ |
| 896 | #else |
| 897 | *compilerID = -1; /* unknown (i.e., no asm/MMX code compiled) */ |
| 898 | #endif |
| 899 | #endif |
| 900 | } |
| 901 | |
| 902 | return settable_mmx_flags; /* _theoretically_ settable capabilities only */ |
| 903 | } |
| 904 | |
| 905 | /* this function was added to libpng 1.2.0 */ |
| 906 | png_byte PNGAPI |
| 907 | png_get_mmx_bitdepth_threshold (png_structp png_ptr) |
| 908 | { |
| 909 | return (png_byte)(png_ptr? png_ptr->mmx_bitdepth_threshold : 0); |
| 910 | } |
| 911 | |
| 912 | /* this function was added to libpng 1.2.0 */ |
| 913 | png_uint_32 PNGAPI |
| 914 | png_get_mmx_rowbytes_threshold (png_structp png_ptr) |
| 915 | { |
| 916 | return (png_uint_32)(png_ptr? png_ptr->mmx_rowbytes_threshold : 0L); |
| 917 | } |
| 918 | #endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */ |
| 919 | |
| 920 | #ifdef PNG_SET_USER_LIMITS_SUPPORTED |
| 921 | /* these functions were added to libpng 1.2.6 */ |
| 922 | png_uint_32 PNGAPI |
| 923 | png_get_user_width_max (png_structp png_ptr) |
| 924 | { |
| 925 | return (png_ptr? png_ptr->user_width_max : 0); |
| 926 | } |
| 927 | png_uint_32 PNGAPI |
| 928 | png_get_user_height_max (png_structp png_ptr) |
| 929 | { |
| 930 | return (png_ptr? png_ptr->user_height_max : 0); |
| 931 | } |
| 932 | #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */ |
| 933 | |
| 934 | #endif /* ?PNG_1_0_X */ |