1 2/* pngget.c - retrieval of values from info struct 3 * 4 * Last changed in libpng 1.6.17 [March 26, 2015] 5 * Copyright (c) 1998-2002,2004,2006-2015 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 19png_uint_32 PNGAPI 20png_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 29png_size_t PNGAPI 30png_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 39png_bytepp PNGAPI 40png_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 */ 51png_uint_32 PNGAPI 52png_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 60png_uint_32 PNGAPI 61png_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 69png_byte PNGAPI 70png_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 78png_byte PNGAPI 79png_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 87png_byte PNGAPI 88png_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 96png_byte PNGAPI 97png_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 105png_byte PNGAPI 106png_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 114png_uint_32 PNGAPI 115png_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 136png_uint_32 PNGAPI 137png_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 158png_uint_32 PNGAPI 159png_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 180float PNGAPI 181png_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 204png_fixed_point PNGAPI 205png_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 235png_int_32 PNGAPI 236png_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 255png_int_32 PNGAPI 256png_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 275png_int_32 PNGAPI 276png_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 295png_int_32 PNGAPI 296png_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 316static png_uint_32 317ppi_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 348png_uint_32 PNGAPI 349png_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 354png_uint_32 PNGAPI 355png_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 360png_uint_32 PNGAPI 361png_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 367static png_fixed_point 368png_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 378png_fixed_point PNGAPI 379png_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 388png_fixed_point PNGAPI 389png_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 398float PNGAPI 399png_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 409float PNGAPI 410png_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 420png_uint_32 PNGAPI 421png_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 466png_byte PNGAPI 467png_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 476png_const_bytep PNGAPI 477png_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 487png_uint_32 PNGAPI 488png_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 511png_uint_32 PNGAPI 512png_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 557png_uint_32 PNGAPI 558png_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 603png_uint_32 PNGAPI 604png_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 640png_uint_32 PNGAPI 641png_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 677png_uint_32 PNGAPI 678png_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 696png_uint_32 PNGAPI 697png_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 717png_uint_32 PNGAPI 718png_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 735png_uint_32 PNGAPI 736png_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 762int PNGAPI 763png_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 777png_uint_32 PNGAPI 778png_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 794png_uint_32 PNGAPI 795png_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 839png_uint_32 PNGAPI 840png_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 860png_uint_32 PNGAPI 861png_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) 890png_uint_32 PNGAPI 891png_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 913png_uint_32 PNGAPI 914png_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 */ 929png_uint_32 PNGAPI 930png_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 947png_uint_32 PNGAPI 948png_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 981png_uint_32 PNGAPI 982png_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 1000png_uint_32 PNGAPI 1001png_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 1018int PNGAPI 1019png_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 1044png_uint_32 PNGAPI 1045png_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 1062png_uint_32 PNGAPI 1063png_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 1108int PNGAPI 1109png_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 1123png_byte PNGAPI 1124png_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 1131png_voidp PNGAPI 1132png_get_user_chunk_ptr(png_const_structrp png_ptr) 1133{ 1134 return (png_ptr ? png_ptr->user_chunk_ptr : NULL); 1135} 1136#endif 1137 1138png_size_t PNGAPI 1139png_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 */ 1164png_uint_32 PNGAPI 1165png_get_user_width_max (png_const_structrp png_ptr) 1166{ 1167 return (png_ptr ? png_ptr->user_width_max : 0); 1168} 1169 1170png_uint_32 PNGAPI 1171png_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 */ 1177png_uint_32 PNGAPI 1178png_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 */ 1184png_alloc_size_t PNGAPI 1185png_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 1193png_uint_32 PNGAPI 1194png_get_io_state (png_const_structrp png_ptr) 1195{ 1196 return png_ptr->io_state; 1197} 1198 1199png_uint_32 PNGAPI 1200png_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 1208int PNGAPI 1209png_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