1 2 /* pngget.c - retrieval of values from info struct 3 * 4 * Last changed in libpng 1.6.24 [August 4, 2016] 5 * Copyright (c) 1998-2002,2004,2006-2016 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 */ 14 15 #include "pngpriv.h" 16 17 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) 18 19 png_uint_32 PNGAPI 20 png_get_valid(png_const_structrp png_ptr, png_const_inforp info_ptr, 21 png_uint_32 flag) 22 { 23 if (png_ptr != NULL && info_ptr != NULL) 24 return(info_ptr->valid & flag); 25 26 return(0); 27 } 28 29 png_size_t PNGAPI 30 png_get_rowbytes(png_const_structrp png_ptr, png_const_inforp info_ptr) 31 { 32 if (png_ptr != NULL && info_ptr != NULL) 33 return(info_ptr->rowbytes); 34 35 return(0); 36 } 37 38 #ifdef PNG_INFO_IMAGE_SUPPORTED 39 png_bytepp PNGAPI 40 png_get_rows(png_const_structrp png_ptr, png_const_inforp info_ptr) 41 { 42 if (png_ptr != NULL && info_ptr != NULL) 43 return(info_ptr->row_pointers); 44 45 return(0); 46 } 47 #endif 48 49 #ifdef PNG_EASY_ACCESS_SUPPORTED 50 /* Easy access to info, added in libpng-0.99 */ 51 png_uint_32 PNGAPI 52 png_get_image_width(png_const_structrp png_ptr, png_const_inforp info_ptr) 53 { 54 if (png_ptr != NULL && info_ptr != NULL) 55 return info_ptr->width; 56 57 return (0); 58 } 59 60 png_uint_32 PNGAPI 61 png_get_image_height(png_const_structrp png_ptr, png_const_inforp info_ptr) 62 { 63 if (png_ptr != NULL && info_ptr != NULL) 64 return info_ptr->height; 65 66 return (0); 67 } 68 69 png_byte PNGAPI 70 png_get_bit_depth(png_const_structrp png_ptr, png_const_inforp info_ptr) 71 { 72 if (png_ptr != NULL && info_ptr != NULL) 73 return info_ptr->bit_depth; 74 75 return (0); 76 } 77 78 png_byte PNGAPI 79 png_get_color_type(png_const_structrp png_ptr, png_const_inforp info_ptr) 80 { 81 if (png_ptr != NULL && info_ptr != NULL) 82 return info_ptr->color_type; 83 84 return (0); 85 } 86 87 png_byte PNGAPI 88 png_get_filter_type(png_const_structrp png_ptr, png_const_inforp info_ptr) 89 { 90 if (png_ptr != NULL && info_ptr != NULL) 91 return info_ptr->filter_type; 92 93 return (0); 94 } 95 96 png_byte PNGAPI 97 png_get_interlace_type(png_const_structrp png_ptr, png_const_inforp info_ptr) 98 { 99 if (png_ptr != NULL && info_ptr != NULL) 100 return info_ptr->interlace_type; 101 102 return (0); 103 } 104 105 png_byte PNGAPI 106 png_get_compression_type(png_const_structrp png_ptr, png_const_inforp info_ptr) 107 { 108 if (png_ptr != NULL && info_ptr != NULL) 109 return info_ptr->compression_type; 110 111 return (0); 112 } 113 114 png_uint_32 PNGAPI 115 png_get_x_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp 116 info_ptr) 117 { 118 #ifdef PNG_pHYs_SUPPORTED 119 if (png_ptr != NULL && info_ptr != NULL && 120 (info_ptr->valid & PNG_INFO_pHYs) != 0) 121 { 122 png_debug1(1, "in %s retrieval function", 123 "png_get_x_pixels_per_meter"); 124 125 if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER) 126 return (info_ptr->x_pixels_per_unit); 127 } 128 #else 129 PNG_UNUSED(png_ptr) 130 PNG_UNUSED(info_ptr) 131 #endif 132 133 return (0); 134 } 135 136 png_uint_32 PNGAPI 137 png_get_y_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp 138 info_ptr) 139 { 140 #ifdef PNG_pHYs_SUPPORTED 141 if (png_ptr != NULL && info_ptr != NULL && 142 (info_ptr->valid & PNG_INFO_pHYs) != 0) 143 { 144 png_debug1(1, "in %s retrieval function", 145 "png_get_y_pixels_per_meter"); 146 147 if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER) 148 return (info_ptr->y_pixels_per_unit); 149 } 150 #else 151 PNG_UNUSED(png_ptr) 152 PNG_UNUSED(info_ptr) 153 #endif 154 155 return (0); 156 } 157 158 png_uint_32 PNGAPI 159 png_get_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr) 160 { 161 #ifdef PNG_pHYs_SUPPORTED 162 if (png_ptr != NULL && info_ptr != NULL && 163 (info_ptr->valid & PNG_INFO_pHYs) != 0) 164 { 165 png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter"); 166 167 if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER && 168 info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit) 169 return (info_ptr->x_pixels_per_unit); 170 } 171 #else 172 PNG_UNUSED(png_ptr) 173 PNG_UNUSED(info_ptr) 174 #endif 175 176 return (0); 177 } 178 179 #ifdef PNG_FLOATING_POINT_SUPPORTED 180 float PNGAPI 181 png_get_pixel_aspect_ratio(png_const_structrp png_ptr, png_const_inforp 182 info_ptr) 183 { 184 #ifdef PNG_READ_pHYs_SUPPORTED 185 if (png_ptr != NULL && info_ptr != NULL && 186 (info_ptr->valid & PNG_INFO_pHYs) != 0) 187 { 188 png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio"); 189 190 if (info_ptr->x_pixels_per_unit != 0) 191 return ((float)((float)info_ptr->y_pixels_per_unit 192 /(float)info_ptr->x_pixels_per_unit)); 193 } 194 #else 195 PNG_UNUSED(png_ptr) 196 PNG_UNUSED(info_ptr) 197 #endif 198 199 return ((float)0.0); 200 } 201 #endif 202 203 #ifdef PNG_FIXED_POINT_SUPPORTED 204 png_fixed_point PNGAPI 205 png_get_pixel_aspect_ratio_fixed(png_const_structrp png_ptr, 206 png_const_inforp info_ptr) 207 { 208 #ifdef PNG_READ_pHYs_SUPPORTED 209 if (png_ptr != NULL && info_ptr != NULL && 210 (info_ptr->valid & PNG_INFO_pHYs) != 0 && 211 info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0 && 212 info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX && 213 info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX) 214 { 215 png_fixed_point res; 216 217 png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio_fixed"); 218 219 /* The following casts work because a PNG 4 byte integer only has a valid 220 * range of 0..2^31-1; otherwise the cast might overflow. 221 */ 222 if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1, 223 (png_int_32)info_ptr->x_pixels_per_unit) != 0) 224 return res; 225 } 226 #else 227 PNG_UNUSED(png_ptr) 228 PNG_UNUSED(info_ptr) 229 #endif 230 231 return 0; 232 } 233 #endif 234 235 png_int_32 PNGAPI 236 png_get_x_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr) 237 { 238 #ifdef PNG_oFFs_SUPPORTED 239 if (png_ptr != NULL && info_ptr != NULL && 240 (info_ptr->valid & PNG_INFO_oFFs) != 0) 241 { 242 png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns"); 243 244 if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER) 245 return (info_ptr->x_offset); 246 } 247 #else 248 PNG_UNUSED(png_ptr) 249 PNG_UNUSED(info_ptr) 250 #endif 251 252 return (0); 253 } 254 255 png_int_32 PNGAPI 256 png_get_y_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr) 257 { 258 #ifdef PNG_oFFs_SUPPORTED 259 if (png_ptr != NULL && info_ptr != NULL && 260 (info_ptr->valid & PNG_INFO_oFFs) != 0) 261 { 262 png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns"); 263 264 if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER) 265 return (info_ptr->y_offset); 266 } 267 #else 268 PNG_UNUSED(png_ptr) 269 PNG_UNUSED(info_ptr) 270 #endif 271 272 return (0); 273 } 274 275 png_int_32 PNGAPI 276 png_get_x_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr) 277 { 278 #ifdef PNG_oFFs_SUPPORTED 279 if (png_ptr != NULL && info_ptr != NULL && 280 (info_ptr->valid & PNG_INFO_oFFs) != 0) 281 { 282 png_debug1(1, "in %s retrieval function", "png_get_x_offset_pixels"); 283 284 if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL) 285 return (info_ptr->x_offset); 286 } 287 #else 288 PNG_UNUSED(png_ptr) 289 PNG_UNUSED(info_ptr) 290 #endif 291 292 return (0); 293 } 294 295 png_int_32 PNGAPI 296 png_get_y_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr) 297 { 298 #ifdef PNG_oFFs_SUPPORTED 299 if (png_ptr != NULL && info_ptr != NULL && 300 (info_ptr->valid & PNG_INFO_oFFs) != 0) 301 { 302 png_debug1(1, "in %s retrieval function", "png_get_y_offset_pixels"); 303 304 if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL) 305 return (info_ptr->y_offset); 306 } 307 #else 308 PNG_UNUSED(png_ptr) 309 PNG_UNUSED(info_ptr) 310 #endif 311 312 return (0); 313 } 314 315 #ifdef PNG_INCH_CONVERSIONS_SUPPORTED 316 static png_uint_32 317 ppi_from_ppm(png_uint_32 ppm) 318 { 319 #if 0 320 /* The conversion is *(2.54/100), in binary (32 digits): 321 * .00000110100000001001110101001001 322 */ 323 png_uint_32 t1001, t1101; 324 ppm >>= 1; /* .1 */ 325 t1001 = ppm + (ppm >> 3); /* .1001 */ 326 t1101 = t1001 + (ppm >> 1); /* .1101 */ 327 ppm >>= 20; /* .000000000000000000001 */ 328 t1101 += t1101 >> 15; /* .1101000000000001101 */ 329 t1001 >>= 11; /* .000000000001001 */ 330 t1001 += t1001 >> 12; /* .000000000001001000000001001 */ 331 ppm += t1001; /* .000000000001001000001001001 */ 332 ppm += t1101; /* .110100000001001110101001001 */ 333 return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */ 334 #else 335 /* The argument is a PNG unsigned integer, so it is not permitted 336 * to be bigger than 2^31. 337 */ 338 png_fixed_point result; 339 if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127, 340 5000) != 0) 341 return result; 342 343 /* Overflow. */ 344 return 0; 345 #endif 346 } 347 348 png_uint_32 PNGAPI 349 png_get_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr) 350 { 351 return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr)); 352 } 353 354 png_uint_32 PNGAPI 355 png_get_x_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr) 356 { 357 return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr)); 358 } 359 360 png_uint_32 PNGAPI 361 png_get_y_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr) 362 { 363 return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr)); 364 } 365 366 #ifdef PNG_FIXED_POINT_SUPPORTED 367 static png_fixed_point 368 png_fixed_inches_from_microns(png_const_structrp png_ptr, png_int_32 microns) 369 { 370 /* Convert from metres * 1,000,000 to inches * 100,000, meters to 371 * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127. 372 * Notice that this can overflow - a warning is output and 0 is 373 * returned. 374 */ 375 return png_muldiv_warn(png_ptr, microns, 500, 127); 376 } 377 378 png_fixed_point PNGAPI 379 png_get_x_offset_inches_fixed(png_const_structrp png_ptr, 380 png_const_inforp info_ptr) 381 { 382 return png_fixed_inches_from_microns(png_ptr, 383 png_get_x_offset_microns(png_ptr, info_ptr)); 384 } 385 #endif 386 387 #ifdef PNG_FIXED_POINT_SUPPORTED 388 png_fixed_point PNGAPI 389 png_get_y_offset_inches_fixed(png_const_structrp png_ptr, 390 png_const_inforp info_ptr) 391 { 392 return png_fixed_inches_from_microns(png_ptr, 393 png_get_y_offset_microns(png_ptr, info_ptr)); 394 } 395 #endif 396 397 #ifdef PNG_FLOATING_POINT_SUPPORTED 398 float PNGAPI 399 png_get_x_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr) 400 { 401 /* To avoid the overflow do the conversion directly in floating 402 * point. 403 */ 404 return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937); 405 } 406 #endif 407 408 #ifdef PNG_FLOATING_POINT_SUPPORTED 409 float PNGAPI 410 png_get_y_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr) 411 { 412 /* To avoid the overflow do the conversion directly in floating 413 * point. 414 */ 415 return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937); 416 } 417 #endif 418 419 #ifdef PNG_pHYs_SUPPORTED 420 png_uint_32 PNGAPI 421 png_get_pHYs_dpi(png_const_structrp png_ptr, png_const_inforp info_ptr, 422 png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) 423 { 424 png_uint_32 retval = 0; 425 426 if (png_ptr != NULL && info_ptr != NULL && 427 (info_ptr->valid & PNG_INFO_pHYs) != 0) 428 { 429 png_debug1(1, "in %s retrieval function", "pHYs"); 430 431 if (res_x != NULL) 432 { 433 *res_x = info_ptr->x_pixels_per_unit; 434 retval |= PNG_INFO_pHYs; 435 } 436 437 if (res_y != NULL) 438 { 439 *res_y = info_ptr->y_pixels_per_unit; 440 retval |= PNG_INFO_pHYs; 441 } 442 443 if (unit_type != NULL) 444 { 445 *unit_type = (int)info_ptr->phys_unit_type; 446 retval |= PNG_INFO_pHYs; 447 448 if (*unit_type == 1) 449 { 450 if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50); 451 if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50); 452 } 453 } 454 } 455 456 return (retval); 457 } 458 #endif /* pHYs */ 459 #endif /* INCH_CONVERSIONS */ 460 461 /* png_get_channels really belongs in here, too, but it's been around longer */ 462 463 #endif /* EASY_ACCESS */ 464 465 466 png_byte PNGAPI 467 png_get_channels(png_const_structrp png_ptr, png_const_inforp info_ptr) 468 { 469 if (png_ptr != NULL && info_ptr != NULL) 470 return(info_ptr->channels); 471 472 return (0); 473 } 474 475 #ifdef PNG_READ_SUPPORTED 476 png_const_bytep PNGAPI 477 png_get_signature(png_const_structrp png_ptr, png_const_inforp info_ptr) 478 { 479 if (png_ptr != NULL && info_ptr != NULL) 480 return(info_ptr->signature); 481 482 return (NULL); 483 } 484 #endif 485 486 #ifdef PNG_bKGD_SUPPORTED 487 png_uint_32 PNGAPI 488 png_get_bKGD(png_const_structrp png_ptr, png_inforp info_ptr, 489 png_color_16p *background) 490 { 491 if (png_ptr != NULL && info_ptr != NULL && 492 (info_ptr->valid & PNG_INFO_bKGD) != 0 && 493 background != NULL) 494 { 495 png_debug1(1, "in %s retrieval function", "bKGD"); 496 497 *background = &(info_ptr->background); 498 return (PNG_INFO_bKGD); 499 } 500 501 return (0); 502 } 503 #endif 504 505 #ifdef PNG_cHRM_SUPPORTED 506 /* The XYZ APIs were added in 1.5.5 to take advantage of the code added at the 507 * same time to correct the rgb grayscale coefficient defaults obtained from the 508 * cHRM chunk in 1.5.4 509 */ 510 # ifdef PNG_FLOATING_POINT_SUPPORTED 511 png_uint_32 PNGAPI 512 png_get_cHRM(png_const_structrp png_ptr, png_const_inforp info_ptr, 513 double *white_x, double *white_y, double *red_x, double *red_y, 514 double *green_x, double *green_y, double *blue_x, double *blue_y) 515 { 516 /* Quiet API change: this code used to only return the end points if a cHRM 517 * chunk was present, but the end points can also come from iCCP or sRGB 518 * chunks, so in 1.6.0 the png_get_ APIs return the end points regardless and 519 * the png_set_ APIs merely check that set end points are mutually 520 * consistent. 521 */ 522 if (png_ptr != NULL && info_ptr != NULL && 523 (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0) 524 { 525 png_debug1(1, "in %s retrieval function", "cHRM"); 526 527 if (white_x != NULL) 528 *white_x = png_float(png_ptr, 529 info_ptr->colorspace.end_points_xy.whitex, "cHRM white X"); 530 if (white_y != NULL) 531 *white_y = png_float(png_ptr, 532 info_ptr->colorspace.end_points_xy.whitey, "cHRM white Y"); 533 if (red_x != NULL) 534 *red_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redx, 535 "cHRM red X"); 536 if (red_y != NULL) 537 *red_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redy, 538 "cHRM red Y"); 539 if (green_x != NULL) 540 *green_x = png_float(png_ptr, 541 info_ptr->colorspace.end_points_xy.greenx, "cHRM green X"); 542 if (green_y != NULL) 543 *green_y = png_float(png_ptr, 544 info_ptr->colorspace.end_points_xy.greeny, "cHRM green Y"); 545 if (blue_x != NULL) 546 *blue_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluex, 547 "cHRM blue X"); 548 if (blue_y != NULL) 549 *blue_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluey, 550 "cHRM blue Y"); 551 return (PNG_INFO_cHRM); 552 } 553 554 return (0); 555 } 556 557 png_uint_32 PNGAPI 558 png_get_cHRM_XYZ(png_const_structrp png_ptr, png_const_inforp info_ptr, 559 double *red_X, double *red_Y, double *red_Z, double *green_X, 560 double *green_Y, double *green_Z, double *blue_X, double *blue_Y, 561 double *blue_Z) 562 { 563 if (png_ptr != NULL && info_ptr != NULL && 564 (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0) 565 { 566 png_debug1(1, "in %s retrieval function", "cHRM_XYZ(float)"); 567 568 if (red_X != NULL) 569 *red_X = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_X, 570 "cHRM red X"); 571 if (red_Y != NULL) 572 *red_Y = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Y, 573 "cHRM red Y"); 574 if (red_Z != NULL) 575 *red_Z = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Z, 576 "cHRM red Z"); 577 if (green_X != NULL) 578 *green_X = png_float(png_ptr, 579 info_ptr->colorspace.end_points_XYZ.green_X, "cHRM green X"); 580 if (green_Y != NULL) 581 *green_Y = png_float(png_ptr, 582 info_ptr->colorspace.end_points_XYZ.green_Y, "cHRM green Y"); 583 if (green_Z != NULL) 584 *green_Z = png_float(png_ptr, 585 info_ptr->colorspace.end_points_XYZ.green_Z, "cHRM green Z"); 586 if (blue_X != NULL) 587 *blue_X = png_float(png_ptr, 588 info_ptr->colorspace.end_points_XYZ.blue_X, "cHRM blue X"); 589 if (blue_Y != NULL) 590 *blue_Y = png_float(png_ptr, 591 info_ptr->colorspace.end_points_XYZ.blue_Y, "cHRM blue Y"); 592 if (blue_Z != NULL) 593 *blue_Z = png_float(png_ptr, 594 info_ptr->colorspace.end_points_XYZ.blue_Z, "cHRM blue Z"); 595 return (PNG_INFO_cHRM); 596 } 597 598 return (0); 599 } 600 # endif 601 602 # ifdef PNG_FIXED_POINT_SUPPORTED 603 png_uint_32 PNGAPI 604 png_get_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr, 605 png_fixed_point *int_red_X, png_fixed_point *int_red_Y, 606 png_fixed_point *int_red_Z, png_fixed_point *int_green_X, 607 png_fixed_point *int_green_Y, png_fixed_point *int_green_Z, 608 png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y, 609 png_fixed_point *int_blue_Z) 610 { 611 if (png_ptr != NULL && info_ptr != NULL && 612 (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0) 613 { 614 png_debug1(1, "in %s retrieval function", "cHRM_XYZ"); 615 616 if (int_red_X != NULL) 617 *int_red_X = info_ptr->colorspace.end_points_XYZ.red_X; 618 if (int_red_Y != NULL) 619 *int_red_Y = info_ptr->colorspace.end_points_XYZ.red_Y; 620 if (int_red_Z != NULL) 621 *int_red_Z = info_ptr->colorspace.end_points_XYZ.red_Z; 622 if (int_green_X != NULL) 623 *int_green_X = info_ptr->colorspace.end_points_XYZ.green_X; 624 if (int_green_Y != NULL) 625 *int_green_Y = info_ptr->colorspace.end_points_XYZ.green_Y; 626 if (int_green_Z != NULL) 627 *int_green_Z = info_ptr->colorspace.end_points_XYZ.green_Z; 628 if (int_blue_X != NULL) 629 *int_blue_X = info_ptr->colorspace.end_points_XYZ.blue_X; 630 if (int_blue_Y != NULL) 631 *int_blue_Y = info_ptr->colorspace.end_points_XYZ.blue_Y; 632 if (int_blue_Z != NULL) 633 *int_blue_Z = info_ptr->colorspace.end_points_XYZ.blue_Z; 634 return (PNG_INFO_cHRM); 635 } 636 637 return (0); 638 } 639 640 png_uint_32 PNGAPI 641 png_get_cHRM_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr, 642 png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x, 643 png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y, 644 png_fixed_point *blue_x, png_fixed_point *blue_y) 645 { 646 png_debug1(1, "in %s retrieval function", "cHRM"); 647 648 if (png_ptr != NULL && info_ptr != NULL && 649 (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0) 650 { 651 if (white_x != NULL) 652 *white_x = info_ptr->colorspace.end_points_xy.whitex; 653 if (white_y != NULL) 654 *white_y = info_ptr->colorspace.end_points_xy.whitey; 655 if (red_x != NULL) 656 *red_x = info_ptr->colorspace.end_points_xy.redx; 657 if (red_y != NULL) 658 *red_y = info_ptr->colorspace.end_points_xy.redy; 659 if (green_x != NULL) 660 *green_x = info_ptr->colorspace.end_points_xy.greenx; 661 if (green_y != NULL) 662 *green_y = info_ptr->colorspace.end_points_xy.greeny; 663 if (blue_x != NULL) 664 *blue_x = info_ptr->colorspace.end_points_xy.bluex; 665 if (blue_y != NULL) 666 *blue_y = info_ptr->colorspace.end_points_xy.bluey; 667 return (PNG_INFO_cHRM); 668 } 669 670 return (0); 671 } 672 # endif 673 #endif 674 675 #ifdef PNG_gAMA_SUPPORTED 676 # ifdef PNG_FIXED_POINT_SUPPORTED 677 png_uint_32 PNGAPI 678 png_get_gAMA_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr, 679 png_fixed_point *file_gamma) 680 { 681 png_debug1(1, "in %s retrieval function", "gAMA"); 682 683 if (png_ptr != NULL && info_ptr != NULL && 684 (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 && 685 file_gamma != NULL) 686 { 687 *file_gamma = info_ptr->colorspace.gamma; 688 return (PNG_INFO_gAMA); 689 } 690 691 return (0); 692 } 693 # endif 694 695 # ifdef PNG_FLOATING_POINT_SUPPORTED 696 png_uint_32 PNGAPI 697 png_get_gAMA(png_const_structrp png_ptr, png_const_inforp info_ptr, 698 double *file_gamma) 699 { 700 png_debug1(1, "in %s retrieval function", "gAMA(float)"); 701 702 if (png_ptr != NULL && info_ptr != NULL && 703 (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 && 704 file_gamma != NULL) 705 { 706 *file_gamma = png_float(png_ptr, info_ptr->colorspace.gamma, 707 "png_get_gAMA"); 708 return (PNG_INFO_gAMA); 709 } 710 711 return (0); 712 } 713 # endif 714 #endif 715 716 #ifdef PNG_sRGB_SUPPORTED 717 png_uint_32 PNGAPI 718 png_get_sRGB(png_const_structrp png_ptr, png_const_inforp info_ptr, 719 int *file_srgb_intent) 720 { 721 png_debug1(1, "in %s retrieval function", "sRGB"); 722 723 if (png_ptr != NULL && info_ptr != NULL && 724 (info_ptr->valid & PNG_INFO_sRGB) != 0 && file_srgb_intent != NULL) 725 { 726 *file_srgb_intent = info_ptr->colorspace.rendering_intent; 727 return (PNG_INFO_sRGB); 728 } 729 730 return (0); 731 } 732 #endif 733 734 #ifdef PNG_iCCP_SUPPORTED 735 png_uint_32 PNGAPI 736 png_get_iCCP(png_const_structrp png_ptr, png_inforp info_ptr, 737 png_charpp name, int *compression_type, 738 png_bytepp profile, png_uint_32 *proflen) 739 { 740 png_debug1(1, "in %s retrieval function", "iCCP"); 741 742 if (png_ptr != NULL && info_ptr != NULL && 743 (info_ptr->valid & PNG_INFO_iCCP) != 0 && 744 name != NULL && compression_type != NULL && profile != NULL && 745 proflen != NULL) 746 { 747 *name = info_ptr->iccp_name; 748 *profile = info_ptr->iccp_profile; 749 *proflen = png_get_uint_32(info_ptr->iccp_profile); 750 /* This is somewhat irrelevant since the profile data returned has 751 * actually been uncompressed. 752 */ 753 *compression_type = PNG_COMPRESSION_TYPE_BASE; 754 return (PNG_INFO_iCCP); 755 } 756 757 return (0); 758 } 759 #endif 760 761 #ifdef PNG_sPLT_SUPPORTED 762 int PNGAPI 763 png_get_sPLT(png_const_structrp png_ptr, png_inforp info_ptr, 764 png_sPLT_tpp spalettes) 765 { 766 if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL) 767 { 768 *spalettes = info_ptr->splt_palettes; 769 return info_ptr->splt_palettes_num; 770 } 771 772 return (0); 773 } 774 #endif 775 776 #ifdef PNG_hIST_SUPPORTED 777 png_uint_32 PNGAPI 778 png_get_hIST(png_const_structrp png_ptr, png_inforp info_ptr, 779 png_uint_16p *hist) 780 { 781 png_debug1(1, "in %s retrieval function", "hIST"); 782 783 if (png_ptr != NULL && info_ptr != NULL && 784 (info_ptr->valid & PNG_INFO_hIST) != 0 && hist != NULL) 785 { 786 *hist = info_ptr->hist; 787 return (PNG_INFO_hIST); 788 } 789 790 return (0); 791 } 792 #endif 793 794 png_uint_32 PNGAPI 795 png_get_IHDR(png_const_structrp png_ptr, png_const_inforp info_ptr, 796 png_uint_32 *width, png_uint_32 *height, int *bit_depth, 797 int *color_type, int *interlace_type, int *compression_type, 798 int *filter_type) 799 { 800 png_debug1(1, "in %s retrieval function", "IHDR"); 801 802 if (png_ptr == NULL || info_ptr == NULL) 803 return (0); 804 805 if (width != NULL) 806 *width = info_ptr->width; 807 808 if (height != NULL) 809 *height = info_ptr->height; 810 811 if (bit_depth != NULL) 812 *bit_depth = info_ptr->bit_depth; 813 814 if (color_type != NULL) 815 *color_type = info_ptr->color_type; 816 817 if (compression_type != NULL) 818 *compression_type = info_ptr->compression_type; 819 820 if (filter_type != NULL) 821 *filter_type = info_ptr->filter_type; 822 823 if (interlace_type != NULL) 824 *interlace_type = info_ptr->interlace_type; 825 826 /* This is redundant if we can be sure that the info_ptr values were all 827 * assigned in png_set_IHDR(). We do the check anyhow in case an 828 * application has ignored our advice not to mess with the members 829 * of info_ptr directly. 830 */ 831 png_check_IHDR(png_ptr, info_ptr->width, info_ptr->height, 832 info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type, 833 info_ptr->compression_type, info_ptr->filter_type); 834 835 return (1); 836 } 837 838 #ifdef PNG_oFFs_SUPPORTED 839 png_uint_32 PNGAPI 840 png_get_oFFs(png_const_structrp png_ptr, png_const_inforp info_ptr, 841 png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type) 842 { 843 png_debug1(1, "in %s retrieval function", "oFFs"); 844 845 if (png_ptr != NULL && info_ptr != NULL && 846 (info_ptr->valid & PNG_INFO_oFFs) != 0 && 847 offset_x != NULL && offset_y != NULL && unit_type != NULL) 848 { 849 *offset_x = info_ptr->x_offset; 850 *offset_y = info_ptr->y_offset; 851 *unit_type = (int)info_ptr->offset_unit_type; 852 return (PNG_INFO_oFFs); 853 } 854 855 return (0); 856 } 857 #endif 858 859 #ifdef PNG_pCAL_SUPPORTED 860 png_uint_32 PNGAPI 861 png_get_pCAL(png_const_structrp png_ptr, png_inforp info_ptr, 862 png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams, 863 png_charp *units, png_charpp *params) 864 { 865 png_debug1(1, "in %s retrieval function", "pCAL"); 866 867 if (png_ptr != NULL && info_ptr != NULL && 868 (info_ptr->valid & PNG_INFO_pCAL) != 0 && 869 purpose != NULL && X0 != NULL && X1 != NULL && type != NULL && 870 nparams != NULL && units != NULL && params != NULL) 871 { 872 *purpose = info_ptr->pcal_purpose; 873 *X0 = info_ptr->pcal_X0; 874 *X1 = info_ptr->pcal_X1; 875 *type = (int)info_ptr->pcal_type; 876 *nparams = (int)info_ptr->pcal_nparams; 877 *units = info_ptr->pcal_units; 878 *params = info_ptr->pcal_params; 879 return (PNG_INFO_pCAL); 880 } 881 882 return (0); 883 } 884 #endif 885 886 #ifdef PNG_sCAL_SUPPORTED 887 # ifdef PNG_FIXED_POINT_SUPPORTED 888 # if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \ 889 defined(PNG_FLOATING_POINT_SUPPORTED) 890 png_uint_32 PNGAPI 891 png_get_sCAL_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr, 892 int *unit, png_fixed_point *width, png_fixed_point *height) 893 { 894 if (png_ptr != NULL && info_ptr != NULL && 895 (info_ptr->valid & PNG_INFO_sCAL) != 0) 896 { 897 *unit = info_ptr->scal_unit; 898 /*TODO: make this work without FP support; the API is currently eliminated 899 * if neither floating point APIs nor internal floating point arithmetic 900 * are enabled. 901 */ 902 *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width"); 903 *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height), 904 "sCAL height"); 905 return (PNG_INFO_sCAL); 906 } 907 908 return(0); 909 } 910 # endif /* FLOATING_ARITHMETIC */ 911 # endif /* FIXED_POINT */ 912 # ifdef PNG_FLOATING_POINT_SUPPORTED 913 png_uint_32 PNGAPI 914 png_get_sCAL(png_const_structrp png_ptr, png_const_inforp info_ptr, 915 int *unit, double *width, double *height) 916 { 917 if (png_ptr != NULL && info_ptr != NULL && 918 (info_ptr->valid & PNG_INFO_sCAL) != 0) 919 { 920 *unit = info_ptr->scal_unit; 921 *width = atof(info_ptr->scal_s_width); 922 *height = atof(info_ptr->scal_s_height); 923 return (PNG_INFO_sCAL); 924 } 925 926 return(0); 927 } 928 # endif /* FLOATING POINT */ 929 png_uint_32 PNGAPI 930 png_get_sCAL_s(png_const_structrp png_ptr, png_const_inforp info_ptr, 931 int *unit, png_charpp width, png_charpp height) 932 { 933 if (png_ptr != NULL && info_ptr != NULL && 934 (info_ptr->valid & PNG_INFO_sCAL) != 0) 935 { 936 *unit = info_ptr->scal_unit; 937 *width = info_ptr->scal_s_width; 938 *height = info_ptr->scal_s_height; 939 return (PNG_INFO_sCAL); 940 } 941 942 return(0); 943 } 944 #endif /* sCAL */ 945 946 #ifdef PNG_pHYs_SUPPORTED 947 png_uint_32 PNGAPI 948 png_get_pHYs(png_const_structrp png_ptr, png_const_inforp info_ptr, 949 png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) 950 { 951 png_uint_32 retval = 0; 952 953 png_debug1(1, "in %s retrieval function", "pHYs"); 954 955 if (png_ptr != NULL && info_ptr != NULL && 956 (info_ptr->valid & PNG_INFO_pHYs) != 0) 957 { 958 if (res_x != NULL) 959 { 960 *res_x = info_ptr->x_pixels_per_unit; 961 retval |= PNG_INFO_pHYs; 962 } 963 964 if (res_y != NULL) 965 { 966 *res_y = info_ptr->y_pixels_per_unit; 967 retval |= PNG_INFO_pHYs; 968 } 969 970 if (unit_type != NULL) 971 { 972 *unit_type = (int)info_ptr->phys_unit_type; 973 retval |= PNG_INFO_pHYs; 974 } 975 } 976 977 return (retval); 978 } 979 #endif /* pHYs */ 980 981 png_uint_32 PNGAPI 982 png_get_PLTE(png_const_structrp png_ptr, png_inforp info_ptr, 983 png_colorp *palette, int *num_palette) 984 { 985 png_debug1(1, "in %s retrieval function", "PLTE"); 986 987 if (png_ptr != NULL && info_ptr != NULL && 988 (info_ptr->valid & PNG_INFO_PLTE) != 0 && palette != NULL) 989 { 990 *palette = info_ptr->palette; 991 *num_palette = info_ptr->num_palette; 992 png_debug1(3, "num_palette = %d", *num_palette); 993 return (PNG_INFO_PLTE); 994 } 995 996 return (0); 997 } 998 999 #ifdef PNG_sBIT_SUPPORTED 1000 png_uint_32 PNGAPI 1001 png_get_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, 1002 png_color_8p *sig_bit) 1003 { 1004 png_debug1(1, "in %s retrieval function", "sBIT"); 1005 1006 if (png_ptr != NULL && info_ptr != NULL && 1007 (info_ptr->valid & PNG_INFO_sBIT) != 0 && sig_bit != NULL) 1008 { 1009 *sig_bit = &(info_ptr->sig_bit); 1010 return (PNG_INFO_sBIT); 1011 } 1012 1013 return (0); 1014 } 1015 #endif 1016 1017 #ifdef PNG_TEXT_SUPPORTED 1018 int PNGAPI 1019 png_get_text(png_const_structrp png_ptr, png_inforp info_ptr, 1020 png_textp *text_ptr, int *num_text) 1021 { 1022 if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0) 1023 { 1024 png_debug1(1, "in 0x%lx retrieval function", 1025 (unsigned long)png_ptr->chunk_name); 1026 1027 if (text_ptr != NULL) 1028 *text_ptr = info_ptr->text; 1029 1030 if (num_text != NULL) 1031 *num_text = info_ptr->num_text; 1032 1033 return info_ptr->num_text; 1034 } 1035 1036 if (num_text != NULL) 1037 *num_text = 0; 1038 1039 return(0); 1040 } 1041 #endif 1042 1043 #ifdef PNG_tIME_SUPPORTED 1044 png_uint_32 PNGAPI 1045 png_get_tIME(png_const_structrp png_ptr, png_inforp info_ptr, 1046 png_timep *mod_time) 1047 { 1048 png_debug1(1, "in %s retrieval function", "tIME"); 1049 1050 if (png_ptr != NULL && info_ptr != NULL && 1051 (info_ptr->valid & PNG_INFO_tIME) != 0 && mod_time != NULL) 1052 { 1053 *mod_time = &(info_ptr->mod_time); 1054 return (PNG_INFO_tIME); 1055 } 1056 1057 return (0); 1058 } 1059 #endif 1060 1061 #ifdef PNG_tRNS_SUPPORTED 1062 png_uint_32 PNGAPI 1063 png_get_tRNS(png_const_structrp png_ptr, png_inforp info_ptr, 1064 png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color) 1065 { 1066 png_uint_32 retval = 0; 1067 if (png_ptr != NULL && info_ptr != NULL && 1068 (info_ptr->valid & PNG_INFO_tRNS) != 0) 1069 { 1070 png_debug1(1, "in %s retrieval function", "tRNS"); 1071 1072 if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) 1073 { 1074 if (trans_alpha != NULL) 1075 { 1076 *trans_alpha = info_ptr->trans_alpha; 1077 retval |= PNG_INFO_tRNS; 1078 } 1079 1080 if (trans_color != NULL) 1081 *trans_color = &(info_ptr->trans_color); 1082 } 1083 1084 else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */ 1085 { 1086 if (trans_color != NULL) 1087 { 1088 *trans_color = &(info_ptr->trans_color); 1089 retval |= PNG_INFO_tRNS; 1090 } 1091 1092 if (trans_alpha != NULL) 1093 *trans_alpha = NULL; 1094 } 1095 1096 if (num_trans != NULL) 1097 { 1098 *num_trans = info_ptr->num_trans; 1099 retval |= PNG_INFO_tRNS; 1100 } 1101 } 1102 1103 return (retval); 1104 } 1105 #endif 1106 1107 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED 1108 int PNGAPI 1109 png_get_unknown_chunks(png_const_structrp png_ptr, png_inforp info_ptr, 1110 png_unknown_chunkpp unknowns) 1111 { 1112 if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL) 1113 { 1114 *unknowns = info_ptr->unknown_chunks; 1115 return info_ptr->unknown_chunks_num; 1116 } 1117 1118 return (0); 1119 } 1120 #endif 1121 1122 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1123 png_byte PNGAPI 1124 png_get_rgb_to_gray_status (png_const_structrp png_ptr) 1125 { 1126 return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0); 1127 } 1128 #endif 1129 1130 #ifdef PNG_USER_CHUNKS_SUPPORTED 1131 png_voidp PNGAPI 1132 png_get_user_chunk_ptr(png_const_structrp png_ptr) 1133 { 1134 return (png_ptr ? png_ptr->user_chunk_ptr : NULL); 1135 } 1136 #endif 1137 1138 png_size_t PNGAPI 1139 png_get_compression_buffer_size(png_const_structrp png_ptr) 1140 { 1141 if (png_ptr == NULL) 1142 return 0; 1143 1144 #ifdef PNG_WRITE_SUPPORTED 1145 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0) 1146 #endif 1147 { 1148 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1149 return png_ptr->IDAT_read_size; 1150 #else 1151 return PNG_IDAT_READ_SIZE; 1152 #endif 1153 } 1154 1155 #ifdef PNG_WRITE_SUPPORTED 1156 else 1157 return png_ptr->zbuffer_size; 1158 #endif 1159 } 1160 1161 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 1162 /* These functions were added to libpng 1.2.6 and were enabled 1163 * by default in libpng-1.4.0 */ 1164 png_uint_32 PNGAPI 1165 png_get_user_width_max (png_const_structrp png_ptr) 1166 { 1167 return (png_ptr ? png_ptr->user_width_max : 0); 1168 } 1169 1170 png_uint_32 PNGAPI 1171 png_get_user_height_max (png_const_structrp png_ptr) 1172 { 1173 return (png_ptr ? png_ptr->user_height_max : 0); 1174 } 1175 1176 /* This function was added to libpng 1.4.0 */ 1177 png_uint_32 PNGAPI 1178 png_get_chunk_cache_max (png_const_structrp png_ptr) 1179 { 1180 return (png_ptr ? png_ptr->user_chunk_cache_max : 0); 1181 } 1182 1183 /* This function was added to libpng 1.4.1 */ 1184 png_alloc_size_t PNGAPI 1185 png_get_chunk_malloc_max (png_const_structrp png_ptr) 1186 { 1187 return (png_ptr ? png_ptr->user_chunk_malloc_max : 0); 1188 } 1189 #endif /* SET_USER_LIMITS */ 1190 1191 /* These functions were added to libpng 1.4.0 */ 1192 #ifdef PNG_IO_STATE_SUPPORTED 1193 png_uint_32 PNGAPI 1194 png_get_io_state (png_const_structrp png_ptr) 1195 { 1196 return png_ptr->io_state; 1197 } 1198 1199 png_uint_32 PNGAPI 1200 png_get_io_chunk_type (png_const_structrp png_ptr) 1201 { 1202 return png_ptr->chunk_name; 1203 } 1204 #endif /* IO_STATE */ 1205 1206 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED 1207 # ifdef PNG_GET_PALETTE_MAX_SUPPORTED 1208 int PNGAPI 1209 png_get_palette_max(png_const_structp png_ptr, png_const_infop info_ptr) 1210 { 1211 if (png_ptr != NULL && info_ptr != NULL) 1212 return png_ptr->num_palette_max; 1213 1214 return (-1); 1215 } 1216 # endif 1217 #endif 1218 1219 #endif /* READ || WRITE */ 1220
