src/png/pngget.c

   1
   2 /* pngget.c - retrieval of values from info struct
   3  *
   4  * Last changed in libpng 1.6.1 [March 28, 2013]
   5  * Copyright (c) 1998-2013 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 && (info_ptr->valid & PNG_INFO_pHYs))
 120       {
 121          png_debug1(1, "in %s retrieval function",
 122              "png_get_x_pixels_per_meter");
 123
 124          if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
 125             return (info_ptr->x_pixels_per_unit);
 126       }
 127 #endif
 128
 129    return (0);
 130 }
 131
 132 png_uint_32 PNGAPI
 133 png_get_y_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp
 134     info_ptr)
 135 {
 136 #ifdef PNG_pHYs_SUPPORTED
 137    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
 138    {
 139       png_debug1(1, "in %s retrieval function",
 140           "png_get_y_pixels_per_meter");
 141
 142       if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)
 143          return (info_ptr->y_pixels_per_unit);
 144    }
 145 #endif
 146
 147    return (0);
 148 }
 149
 150 png_uint_32 PNGAPI
 151 png_get_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr)
 152 {
 153 #ifdef PNG_pHYs_SUPPORTED
 154    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
 155    {
 156       png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter");
 157
 158       if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER &&
 159           info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit)
 160          return (info_ptr->x_pixels_per_unit);
 161    }
 162 #endif
 163
 164    return (0);
 165 }
 166
 167 #ifdef PNG_FLOATING_POINT_SUPPORTED
 168 float PNGAPI
 169 png_get_pixel_aspect_ratio(png_const_structrp png_ptr, png_const_inforp
 170    info_ptr)
 171 {
 172 #ifdef PNG_READ_pHYs_SUPPORTED
 173    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
 174    {
 175       png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio");
 176
 177       if (info_ptr->x_pixels_per_unit != 0)
 178          return ((float)((float)info_ptr->y_pixels_per_unit
 179              /(float)info_ptr->x_pixels_per_unit));
 180    }
 181 #else
 182    PNG_UNUSED(png_ptr)
 183    PNG_UNUSED(info_ptr)
 184 #endif
 185
 186    return ((float)0.0);
 187 }
 188 #endif
 189
 190 #ifdef PNG_FIXED_POINT_SUPPORTED
 191 png_fixed_point PNGAPI
 192 png_get_pixel_aspect_ratio_fixed(png_const_structrp png_ptr,
 193     png_const_inforp info_ptr)
 194 {
 195 #ifdef PNG_READ_pHYs_SUPPORTED
 196    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)
 197        && info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0
 198        && info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX
 199        && info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX)
 200    {
 201       png_fixed_point res;
 202
 203       png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio_fixed");
 204
 205       /* The following casts work because a PNG 4 byte integer only has a valid
 206        * range of 0..2^31-1; otherwise the cast might overflow.
 207        */
 208       if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1,
 209           (png_int_32)info_ptr->x_pixels_per_unit))
 210          return res;
 211    }
 212 #else
 213    PNG_UNUSED(png_ptr)
 214    PNG_UNUSED(info_ptr)
 215 #endif
 216
 217    return 0;
 218 }
 219 #endif
 220
 221 png_int_32 PNGAPI
 222 png_get_x_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
 223 {
 224 #ifdef PNG_oFFs_SUPPORTED
 225    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
 226    {
 227       png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");
 228
 229       if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
 230          return (info_ptr->x_offset);
 231    }
 232 #endif
 233
 234    return (0);
 235 }
 236
 237 png_int_32 PNGAPI
 238 png_get_y_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
 239 {
 240 #ifdef PNG_oFFs_SUPPORTED
 241    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
 242    {
 243       png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");
 244
 245       if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)
 246          return (info_ptr->y_offset);
 247    }
 248 #endif
 249
 250    return (0);
 251 }
 252
 253 png_int_32 PNGAPI
 254 png_get_x_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
 255 {
 256 #ifdef PNG_oFFs_SUPPORTED
 257    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
 258    {
 259       png_debug1(1, "in %s retrieval function", "png_get_x_offset_pixels");
 260
 261       if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
 262          return (info_ptr->x_offset);
 263    }
 264 #endif
 265
 266    return (0);
 267 }
 268
 269 png_int_32 PNGAPI
 270 png_get_y_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
 271 {
 272 #ifdef PNG_oFFs_SUPPORTED
 273    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
 274    {
 275       png_debug1(1, "in %s retrieval function", "png_get_y_offset_pixels");
 276
 277       if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)
 278          return (info_ptr->y_offset);
 279    }
 280 #endif
 281
 282    return (0);
 283 }
 284
 285 #ifdef PNG_INCH_CONVERSIONS_SUPPORTED
 286 static png_uint_32
 287 ppi_from_ppm(png_uint_32 ppm)
 288 {
 289 #if 0
 290    /* The conversion is *(2.54/100), in binary (32 digits):
 291     * .00000110100000001001110101001001
 292     */
 293    png_uint_32 t1001, t1101;
 294    ppm >>= 1;                  /* .1 */
 295    t1001 = ppm + (ppm >> 3);   /* .1001 */
 296    t1101 = t1001 + (ppm >> 1); /* .1101 */
 297    ppm >>= 20;                 /* .000000000000000000001 */
 298    t1101 += t1101 >> 15;       /* .1101000000000001101 */
 299    t1001 >>= 11;               /* .000000000001001 */
 300    t1001 += t1001 >> 12;       /* .000000000001001000000001001 */
 301    ppm += t1001;               /* .000000000001001000001001001 */
 302    ppm += t1101;               /* .110100000001001110101001001 */
 303    return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */
 304 #else
 305    /* The argument is a PNG unsigned integer, so it is not permitted
 306     * to be bigger than 2^31.
 307     */
 308    png_fixed_point result;
 309    if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127,
 310        5000))
 311       return result;
 312
 313    /* Overflow. */
 314    return 0;
 315 #endif
 316 }
 317
 318 png_uint_32 PNGAPI
 319 png_get_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
 320 {
 321    return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));
 322 }
 323
 324 png_uint_32 PNGAPI
 325 png_get_x_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
 326 {
 327    return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr));
 328 }
 329
 330 png_uint_32 PNGAPI
 331 png_get_y_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
 332 {
 333    return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr));
 334 }
 335
 336 #ifdef PNG_FIXED_POINT_SUPPORTED
 337 static png_fixed_point
 338 png_fixed_inches_from_microns(png_const_structrp png_ptr, png_int_32 microns)
 339 {
 340    /* Convert from metres * 1,000,000 to inches * 100,000, meters to
 341     * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127.
 342     * Notice that this can overflow - a warning is output and 0 is
 343     * returned.
 344     */
 345    return png_muldiv_warn(png_ptr, microns, 500, 127);
 346 }
 347
 348 png_fixed_point PNGAPI
 349 png_get_x_offset_inches_fixed(png_const_structrp png_ptr,
 350     png_const_inforp info_ptr)
 351 {
 352    return png_fixed_inches_from_microns(png_ptr,
 353        png_get_x_offset_microns(png_ptr, info_ptr));
 354 }
 355 #endif
 356
 357 #ifdef PNG_FIXED_POINT_SUPPORTED
 358 png_fixed_point PNGAPI
 359 png_get_y_offset_inches_fixed(png_const_structrp png_ptr,
 360     png_const_inforp info_ptr)
 361 {
 362    return png_fixed_inches_from_microns(png_ptr,
 363        png_get_y_offset_microns(png_ptr, info_ptr));
 364 }
 365 #endif
 366
 367 #ifdef PNG_FLOATING_POINT_SUPPORTED
 368 float PNGAPI
 369 png_get_x_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
 370 {
 371    /* To avoid the overflow do the conversion directly in floating
 372     * point.
 373     */
 374    return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937);
 375 }
 376 #endif
 377
 378 #ifdef PNG_FLOATING_POINT_SUPPORTED
 379 float PNGAPI
 380 png_get_y_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
 381 {
 382    /* To avoid the overflow do the conversion directly in floating
 383     * point.
 384     */
 385    return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937);
 386 }
 387 #endif
 388
 389 #ifdef PNG_pHYs_SUPPORTED
 390 png_uint_32 PNGAPI
 391 png_get_pHYs_dpi(png_const_structrp png_ptr, png_const_inforp info_ptr,
 392     png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 393 {
 394    png_uint_32 retval = 0;
 395
 396    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
 397    {
 398       png_debug1(1, "in %s retrieval function", "pHYs");
 399
 400       if (res_x != NULL)
 401       {
 402          *res_x = info_ptr->x_pixels_per_unit;
 403          retval |= PNG_INFO_pHYs;
 404       }
 405
 406       if (res_y != NULL)
 407       {
 408          *res_y = info_ptr->y_pixels_per_unit;
 409          retval |= PNG_INFO_pHYs;
 410       }
 411
 412       if (unit_type != NULL)
 413       {
 414          *unit_type = (int)info_ptr->phys_unit_type;
 415          retval |= PNG_INFO_pHYs;
 416
 417          if (*unit_type == 1)
 418          {
 419             if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
 420             if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
 421          }
 422       }
 423    }
 424
 425    return (retval);
 426 }
 427 #endif /* PNG_pHYs_SUPPORTED */
 428 #endif  /* PNG_INCH_CONVERSIONS_SUPPORTED */
 429
 430 /* png_get_channels really belongs in here, too, but it's been around longer */
 431
 432 #endif  /* PNG_EASY_ACCESS_SUPPORTED */
 433
 434
 435 png_byte PNGAPI
 436 png_get_channels(png_const_structrp png_ptr, png_const_inforp info_ptr)
 437 {
 438    if (png_ptr != NULL && info_ptr != NULL)
 439       return(info_ptr->channels);
 440
 441    return (0);
 442 }
 443
 444 #ifdef PNG_READ_SUPPORTED
 445 png_const_bytep PNGAPI
 446 png_get_signature(png_const_structrp png_ptr, png_const_inforp info_ptr)
 447 {
 448    if (png_ptr != NULL && info_ptr != NULL)
 449       return(info_ptr->signature);
 450
 451    return (NULL);
 452 }
 453 #endif
 454
 455 #ifdef PNG_bKGD_SUPPORTED
 456 png_uint_32 PNGAPI
 457 png_get_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,
 458    png_color_16p *background)
 459 {
 460    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)
 461        && background != NULL)
 462    {
 463       png_debug1(1, "in %s retrieval function", "bKGD");
 464
 465       *background = &(info_ptr->background);
 466       return (PNG_INFO_bKGD);
 467    }
 468
 469    return (0);
 470 }
 471 #endif
 472
 473 #ifdef PNG_cHRM_SUPPORTED
 474 /* The XYZ APIs were added in 1.5.5 to take advantage of the code added at the
 475  * same time to correct the rgb grayscale coefficient defaults obtained from the
 476  * cHRM chunk in 1.5.4
 477  */
 478 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 479 png_uint_32 PNGAPI
 480 png_get_cHRM(png_const_structrp png_ptr, png_const_inforp info_ptr,
 481     double *white_x, double *white_y, double *red_x, double *red_y,
 482     double *green_x, double *green_y, double *blue_x, double *blue_y)
 483 {
 484    /* Quiet API change: this code used to only return the end points if a cHRM
 485     * chunk was present, but the end points can also come from iCCP or sRGB
 486     * chunks, so in 1.6.0 the png_get_ APIs return the end points regardless and
 487     * the png_set_ APIs merely check that set end points are mutually
 488     * consistent.
 489     */
 490    if (png_ptr != NULL && info_ptr != NULL &&
 491       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS))
 492    {
 493       png_debug1(1, "in %s retrieval function", "cHRM");
 494
 495       if (white_x != NULL)
 496          *white_x = png_float(png_ptr,
 497             info_ptr->colorspace.end_points_xy.whitex, "cHRM white X");
 498       if (white_y != NULL)
 499          *white_y = png_float(png_ptr,
 500             info_ptr->colorspace.end_points_xy.whitey, "cHRM white Y");
 501       if (red_x != NULL)
 502          *red_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redx,
 503             "cHRM red X");
 504       if (red_y != NULL)
 505          *red_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redy,
 506             "cHRM red Y");
 507       if (green_x != NULL)
 508          *green_x = png_float(png_ptr,
 509             info_ptr->colorspace.end_points_xy.greenx, "cHRM green X");
 510       if (green_y != NULL)
 511          *green_y = png_float(png_ptr,
 512             info_ptr->colorspace.end_points_xy.greeny, "cHRM green Y");
 513       if (blue_x != NULL)
 514          *blue_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluex,
 515             "cHRM blue X");
 516       if (blue_y != NULL)
 517          *blue_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluey,
 518             "cHRM blue Y");
 519       return (PNG_INFO_cHRM);
 520    }
 521
 522    return (0);
 523 }
 524
 525 png_uint_32 PNGAPI
 526 png_get_cHRM_XYZ(png_const_structrp png_ptr, png_const_inforp info_ptr,
 527    double *red_X, double *red_Y, double *red_Z, double *green_X,
 528    double *green_Y, double *green_Z, double *blue_X, double *blue_Y,
 529    double *blue_Z)
 530 {
 531    if (png_ptr != NULL && info_ptr != NULL &&
 532       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS))
 533    {
 534       png_debug1(1, "in %s retrieval function", "cHRM_XYZ(float)");
 535
 536       if (red_X != NULL)
 537          *red_X = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_X,
 538             "cHRM red X");
 539       if (red_Y != NULL)
 540          *red_Y = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Y,
 541             "cHRM red Y");
 542       if (red_Z != NULL)
 543          *red_Z = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Z,
 544             "cHRM red Z");
 545       if (green_X != NULL)
 546          *green_X = png_float(png_ptr,
 547             info_ptr->colorspace.end_points_XYZ.green_X, "cHRM green X");
 548       if (green_Y != NULL)
 549          *green_Y = png_float(png_ptr,
 550             info_ptr->colorspace.end_points_XYZ.green_Y, "cHRM green Y");
 551       if (green_Z != NULL)
 552          *green_Z = png_float(png_ptr,
 553             info_ptr->colorspace.end_points_XYZ.green_Z, "cHRM green Z");
 554       if (blue_X != NULL)
 555          *blue_X = png_float(png_ptr,
 556             info_ptr->colorspace.end_points_XYZ.blue_X, "cHRM blue X");
 557       if (blue_Y != NULL)
 558          *blue_Y = png_float(png_ptr,
 559             info_ptr->colorspace.end_points_XYZ.blue_Y, "cHRM blue Y");
 560       if (blue_Z != NULL)
 561          *blue_Z = png_float(png_ptr,
 562             info_ptr->colorspace.end_points_XYZ.blue_Z, "cHRM blue Z");
 563       return (PNG_INFO_cHRM);
 564    }
 565
 566    return (0);
 567 }
 568 #  endif
 569
 570 #  ifdef PNG_FIXED_POINT_SUPPORTED
 571 png_uint_32 PNGAPI
 572 png_get_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
 573     png_fixed_point *int_red_X, png_fixed_point *int_red_Y,
 574     png_fixed_point *int_red_Z, png_fixed_point *int_green_X,
 575     png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,
 576     png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,
 577     png_fixed_point *int_blue_Z)
 578 {
 579    if (png_ptr != NULL && info_ptr != NULL &&
 580       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS))
 581    {
 582       png_debug1(1, "in %s retrieval function", "cHRM_XYZ");
 583
 584       if (int_red_X != NULL)
 585          *int_red_X = info_ptr->colorspace.end_points_XYZ.red_X;
 586       if (int_red_Y != NULL)
 587          *int_red_Y = info_ptr->colorspace.end_points_XYZ.red_Y;
 588       if (int_red_Z != NULL)
 589          *int_red_Z = info_ptr->colorspace.end_points_XYZ.red_Z;
 590       if (int_green_X != NULL)
 591          *int_green_X = info_ptr->colorspace.end_points_XYZ.green_X;
 592       if (int_green_Y != NULL)
 593          *int_green_Y = info_ptr->colorspace.end_points_XYZ.green_Y;
 594       if (int_green_Z != NULL)
 595          *int_green_Z = info_ptr->colorspace.end_points_XYZ.green_Z;
 596       if (int_blue_X != NULL)
 597          *int_blue_X = info_ptr->colorspace.end_points_XYZ.blue_X;
 598       if (int_blue_Y != NULL)
 599          *int_blue_Y = info_ptr->colorspace.end_points_XYZ.blue_Y;
 600       if (int_blue_Z != NULL)
 601          *int_blue_Z = info_ptr->colorspace.end_points_XYZ.blue_Z;
 602       return (PNG_INFO_cHRM);
 603    }
 604
 605    return (0);
 606 }
 607
 608 png_uint_32 PNGAPI
 609 png_get_cHRM_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
 610     png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
 611     png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
 612     png_fixed_point *blue_x, png_fixed_point *blue_y)
 613 {
 614    png_debug1(1, "in %s retrieval function", "cHRM");
 615
 616    if (png_ptr != NULL && info_ptr != NULL &&
 617       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS))
 618    {
 619       if (white_x != NULL)
 620          *white_x = info_ptr->colorspace.end_points_xy.whitex;
 621       if (white_y != NULL)
 622          *white_y = info_ptr->colorspace.end_points_xy.whitey;
 623       if (red_x != NULL)
 624          *red_x = info_ptr->colorspace.end_points_xy.redx;
 625       if (red_y != NULL)
 626          *red_y = info_ptr->colorspace.end_points_xy.redy;
 627       if (green_x != NULL)
 628          *green_x = info_ptr->colorspace.end_points_xy.greenx;
 629       if (green_y != NULL)
 630          *green_y = info_ptr->colorspace.end_points_xy.greeny;
 631       if (blue_x != NULL)
 632          *blue_x = info_ptr->colorspace.end_points_xy.bluex;
 633       if (blue_y != NULL)
 634          *blue_y = info_ptr->colorspace.end_points_xy.bluey;
 635       return (PNG_INFO_cHRM);
 636    }
 637
 638    return (0);
 639 }
 640 #  endif
 641 #endif
 642
 643 #ifdef PNG_gAMA_SUPPORTED
 644 #  ifdef PNG_FIXED_POINT_SUPPORTED
 645 png_uint_32 PNGAPI
 646 png_get_gAMA_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
 647     png_fixed_point *file_gamma)
 648 {
 649    png_debug1(1, "in %s retrieval function", "gAMA");
 650
 651    if (png_ptr != NULL && info_ptr != NULL &&
 652       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) &&
 653       file_gamma != NULL)
 654    {
 655       *file_gamma = info_ptr->colorspace.gamma;
 656       return (PNG_INFO_gAMA);
 657    }
 658
 659    return (0);
 660 }
 661 #  endif
 662
 663 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 664 png_uint_32 PNGAPI
 665 png_get_gAMA(png_const_structrp png_ptr, png_const_inforp info_ptr,
 666     double *file_gamma)
 667 {
 668    png_debug1(1, "in %s retrieval function", "gAMA(float)");
 669
 670    if (png_ptr != NULL && info_ptr != NULL &&
 671       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) &&
 672       file_gamma != NULL)
 673    {
 674       *file_gamma = png_float(png_ptr, info_ptr->colorspace.gamma,
 675          "png_get_gAMA");
 676       return (PNG_INFO_gAMA);
 677    }
 678
 679    return (0);
 680 }
 681 #  endif
 682 #endif
 683
 684 #ifdef PNG_sRGB_SUPPORTED
 685 png_uint_32 PNGAPI
 686 png_get_sRGB(png_const_structrp png_ptr, png_const_inforp info_ptr,
 687     int *file_srgb_intent)
 688 {
 689    png_debug1(1, "in %s retrieval function", "sRGB");
 690
 691    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
 692        && file_srgb_intent != NULL)
 693    {
 694       *file_srgb_intent = info_ptr->colorspace.rendering_intent;
 695       return (PNG_INFO_sRGB);
 696    }
 697
 698    return (0);
 699 }
 700 #endif
 701
 702 #ifdef PNG_iCCP_SUPPORTED
 703 png_uint_32 PNGAPI
 704 png_get_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,
 705     png_charpp name, int *compression_type,
 706     png_bytepp profile, png_uint_32 *proflen)
 707 {
 708    png_debug1(1, "in %s retrieval function", "iCCP");
 709
 710    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
 711        && name != NULL && compression_type != NULL && profile != NULL &&
 712                  proflen != NULL)
 713    {
 714       *name = info_ptr->iccp_name;
 715       *profile = info_ptr->iccp_profile;
 716       *proflen = png_get_uint_32(info_ptr->iccp_profile);
 717       /* This is somewhat irrelevant since the profile data returned has
 718        * actually been uncompressed.
 719        */
 720       *compression_type = PNG_COMPRESSION_TYPE_BASE;
 721       return (PNG_INFO_iCCP);
 722    }
 723
 724    return (0);
 725 }
 726 #endif
 727
 728 #ifdef PNG_sPLT_SUPPORTED
 729 int PNGAPI
 730 png_get_sPLT(png_const_structrp png_ptr, png_inforp info_ptr,
 731     png_sPLT_tpp spalettes)
 732 {
 733    if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
 734    {
 735       *spalettes = info_ptr->splt_palettes;
 736       return info_ptr->splt_palettes_num;
 737    }
 738
 739    return (0);
 740 }
 741 #endif
 742
 743 #ifdef PNG_hIST_SUPPORTED
 744 png_uint_32 PNGAPI
 745 png_get_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
 746     png_uint_16p *hist)
 747 {
 748    png_debug1(1, "in %s retrieval function", "hIST");
 749
 750    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
 751        && hist != NULL)
 752    {
 753       *hist = info_ptr->hist;
 754       return (PNG_INFO_hIST);
 755    }
 756
 757    return (0);
 758 }
 759 #endif
 760
 761 png_uint_32 PNGAPI
 762 png_get_IHDR(png_const_structrp png_ptr, png_const_inforp info_ptr,
 763     png_uint_32 *width, png_uint_32 *height, int *bit_depth,
 764     int *color_type, int *interlace_type, int *compression_type,
 765     int *filter_type)
 766 {
 767    png_debug1(1, "in %s retrieval function", "IHDR");
 768
 769    if (png_ptr == NULL || info_ptr == NULL || width == NULL ||
 770        height == NULL || bit_depth == NULL || color_type == NULL)
 771       return (0);
 772
 773    *width = info_ptr->width;
 774    *height = info_ptr->height;
 775    *bit_depth = info_ptr->bit_depth;
 776    *color_type = info_ptr->color_type;
 777
 778    if (compression_type != NULL)
 779       *compression_type = info_ptr->compression_type;
 780
 781    if (filter_type != NULL)
 782       *filter_type = info_ptr->filter_type;
 783
 784    if (interlace_type != NULL)
 785       *interlace_type = info_ptr->interlace_type;
 786
 787    /* This is redundant if we can be sure that the info_ptr values were all
 788     * assigned in png_set_IHDR().  We do the check anyhow in case an
 789     * application has ignored our advice not to mess with the members
 790     * of info_ptr directly.
 791     */
 792    png_check_IHDR(png_ptr, info_ptr->width, info_ptr->height,
 793        info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
 794        info_ptr->compression_type, info_ptr->filter_type);
 795
 796    return (1);
 797 }
 798
 799 #ifdef PNG_oFFs_SUPPORTED
 800 png_uint_32 PNGAPI
 801 png_get_oFFs(png_const_structrp png_ptr, png_const_inforp info_ptr,
 802     png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
 803 {
 804    png_debug1(1, "in %s retrieval function", "oFFs");
 805
 806    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
 807        && offset_x != NULL && offset_y != NULL && unit_type != NULL)
 808    {
 809       *offset_x = info_ptr->x_offset;
 810       *offset_y = info_ptr->y_offset;
 811       *unit_type = (int)info_ptr->offset_unit_type;
 812       return (PNG_INFO_oFFs);
 813    }
 814
 815    return (0);
 816 }
 817 #endif
 818
 819 #ifdef PNG_pCAL_SUPPORTED
 820 png_uint_32 PNGAPI
 821 png_get_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
 822     png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
 823     png_charp *units, png_charpp *params)
 824 {
 825    png_debug1(1, "in %s retrieval function", "pCAL");
 826
 827    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
 828        && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
 829        nparams != NULL && units != NULL && params != NULL)
 830    {
 831       *purpose = info_ptr->pcal_purpose;
 832       *X0 = info_ptr->pcal_X0;
 833       *X1 = info_ptr->pcal_X1;
 834       *type = (int)info_ptr->pcal_type;
 835       *nparams = (int)info_ptr->pcal_nparams;
 836       *units = info_ptr->pcal_units;
 837       *params = info_ptr->pcal_params;
 838       return (PNG_INFO_pCAL);
 839    }
 840
 841    return (0);
 842 }
 843 #endif
 844
 845 #ifdef PNG_sCAL_SUPPORTED
 846 #  ifdef PNG_FIXED_POINT_SUPPORTED
 847 #    if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \
 848          defined(PNG_FLOATING_POINT_SUPPORTED)
 849 png_uint_32 PNGAPI
 850 png_get_sCAL_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
 851     int *unit, png_fixed_point *width, png_fixed_point *height)
 852 {
 853    if (png_ptr != NULL && info_ptr != NULL &&
 854        (info_ptr->valid & PNG_INFO_sCAL))
 855    {
 856       *unit = info_ptr->scal_unit;
 857       /*TODO: make this work without FP support; the API is currently eliminated
 858        * if neither floating point APIs nor internal floating point arithmetic
 859        * are enabled.
 860        */
 861       *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width");
 862       *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height),
 863          "sCAL height");
 864       return (PNG_INFO_sCAL);
 865    }
 866
 867    return(0);
 868 }
 869 #    endif /* FLOATING_ARITHMETIC */
 870 #  endif /* FIXED_POINT */
 871 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 872 png_uint_32 PNGAPI
 873 png_get_sCAL(png_const_structrp png_ptr, png_const_inforp info_ptr,
 874     int *unit, double *width, double *height)
 875 {
 876    if (png_ptr != NULL && info_ptr != NULL &&
 877        (info_ptr->valid & PNG_INFO_sCAL))
 878    {
 879       *unit = info_ptr->scal_unit;
 880       *width = atof(info_ptr->scal_s_width);
 881       *height = atof(info_ptr->scal_s_height);
 882       return (PNG_INFO_sCAL);
 883    }
 884
 885    return(0);
 886 }
 887 #  endif /* FLOATING POINT */
 888 png_uint_32 PNGAPI
 889 png_get_sCAL_s(png_const_structrp png_ptr, png_const_inforp info_ptr,
 890     int *unit, png_charpp width, png_charpp height)
 891 {
 892    if (png_ptr != NULL && info_ptr != NULL &&
 893        (info_ptr->valid & PNG_INFO_sCAL))
 894    {
 895       *unit = info_ptr->scal_unit;
 896       *width = info_ptr->scal_s_width;
 897       *height = info_ptr->scal_s_height;
 898       return (PNG_INFO_sCAL);
 899    }
 900
 901    return(0);
 902 }
 903 #endif /* sCAL */
 904
 905 #ifdef PNG_pHYs_SUPPORTED
 906 png_uint_32 PNGAPI
 907 png_get_pHYs(png_const_structrp png_ptr, png_const_inforp info_ptr,
 908     png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 909 {
 910    png_uint_32 retval = 0;
 911
 912    png_debug1(1, "in %s retrieval function", "pHYs");
 913
 914    if (png_ptr != NULL && info_ptr != NULL &&
 915        (info_ptr->valid & PNG_INFO_pHYs))
 916    {
 917       if (res_x != NULL)
 918       {
 919          *res_x = info_ptr->x_pixels_per_unit;
 920          retval |= PNG_INFO_pHYs;
 921       }
 922
 923       if (res_y != NULL)
 924       {
 925          *res_y = info_ptr->y_pixels_per_unit;
 926          retval |= PNG_INFO_pHYs;
 927       }
 928
 929       if (unit_type != NULL)
 930       {
 931          *unit_type = (int)info_ptr->phys_unit_type;
 932          retval |= PNG_INFO_pHYs;
 933       }
 934    }
 935
 936    return (retval);
 937 }
 938 #endif /* pHYs */
 939
 940 png_uint_32 PNGAPI
 941 png_get_PLTE(png_const_structrp png_ptr, png_inforp info_ptr,
 942     png_colorp *palette, int *num_palette)
 943 {
 944    png_debug1(1, "in %s retrieval function", "PLTE");
 945
 946    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
 947        && palette != NULL)
 948    {
 949       *palette = info_ptr->palette;
 950       *num_palette = info_ptr->num_palette;
 951       png_debug1(3, "num_palette = %d", *num_palette);
 952       return (PNG_INFO_PLTE);
 953    }
 954
 955    return (0);
 956 }
 957
 958 #ifdef PNG_sBIT_SUPPORTED
 959 png_uint_32 PNGAPI
 960 png_get_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
 961     png_color_8p *sig_bit)
 962 {
 963    png_debug1(1, "in %s retrieval function", "sBIT");
 964
 965    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
 966        && sig_bit != NULL)
 967    {
 968       *sig_bit = &(info_ptr->sig_bit);
 969       return (PNG_INFO_sBIT);
 970    }
 971
 972    return (0);
 973 }
 974 #endif
 975
 976 #ifdef PNG_TEXT_SUPPORTED
 977 int PNGAPI
 978 png_get_text(png_const_structrp png_ptr, png_inforp info_ptr,
 979     png_textp *text_ptr, int *num_text)
 980 {
 981    if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
 982    {
 983       png_debug1(1, "in 0x%lx retrieval function",
 984          (unsigned long)png_ptr->chunk_name);
 985
 986       if (text_ptr != NULL)
 987          *text_ptr = info_ptr->text;
 988
 989       if (num_text != NULL)
 990          *num_text = info_ptr->num_text;
 991
 992       return info_ptr->num_text;
 993    }
 994
 995    if (num_text != NULL)
 996       *num_text = 0;
 997
 998    return(0);
 999 }
1000 #endif
1001
1002 #ifdef PNG_tIME_SUPPORTED
1003 png_uint_32 PNGAPI
1004 png_get_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
1005     png_timep *mod_time)
1006 {
1007    png_debug1(1, "in %s retrieval function", "tIME");
1008
1009    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
1010        && mod_time != NULL)
1011    {
1012       *mod_time = &(info_ptr->mod_time);
1013       return (PNG_INFO_tIME);
1014    }
1015
1016    return (0);
1017 }
1018 #endif
1019
1020 #ifdef PNG_tRNS_SUPPORTED
1021 png_uint_32 PNGAPI
1022 png_get_tRNS(png_const_structrp png_ptr, png_inforp info_ptr,
1023     png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
1024 {
1025    png_uint_32 retval = 0;
1026    if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
1027    {
1028       png_debug1(1, "in %s retrieval function", "tRNS");
1029
1030       if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
1031       {
1032          if (trans_alpha != NULL)
1033          {
1034             *trans_alpha = info_ptr->trans_alpha;
1035             retval |= PNG_INFO_tRNS;
1036          }
1037
1038          if (trans_color != NULL)
1039             *trans_color = &(info_ptr->trans_color);
1040       }
1041
1042       else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
1043       {
1044          if (trans_color != NULL)
1045          {
1046             *trans_color = &(info_ptr->trans_color);
1047             retval |= PNG_INFO_tRNS;
1048          }
1049
1050          if (trans_alpha != NULL)
1051             *trans_alpha = NULL;
1052       }
1053
1054       if (num_trans != NULL)
1055       {
1056          *num_trans = info_ptr->num_trans;
1057          retval |= PNG_INFO_tRNS;
1058       }
1059    }
1060
1061    return (retval);
1062 }
1063 #endif
1064
1065 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1066 int PNGAPI
1067 png_get_unknown_chunks(png_const_structrp png_ptr, png_inforp info_ptr,
1068     png_unknown_chunkpp unknowns)
1069 {
1070    if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
1071    {
1072       *unknowns = info_ptr->unknown_chunks;
1073       return info_ptr->unknown_chunks_num;
1074    }
1075
1076    return (0);
1077 }
1078 #endif
1079
1080 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1081 png_byte PNGAPI
1082 png_get_rgb_to_gray_status (png_const_structrp png_ptr)
1083 {
1084    return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0);
1085 }
1086 #endif
1087
1088 #ifdef PNG_USER_CHUNKS_SUPPORTED
1089 png_voidp PNGAPI
1090 png_get_user_chunk_ptr(png_const_structrp png_ptr)
1091 {
1092    return (png_ptr ? png_ptr->user_chunk_ptr : NULL);
1093 }
1094 #endif
1095
1096 png_size_t PNGAPI
1097 png_get_compression_buffer_size(png_const_structrp png_ptr)
1098 {
1099    if (png_ptr == NULL)
1100       return 0;
1101
1102 #  ifdef PNG_WRITE_SUPPORTED
1103       if (png_ptr->mode & PNG_IS_READ_STRUCT)
1104 #  endif
1105    {
1106 #     ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1107          return png_ptr->IDAT_read_size;
1108 #     else
1109          return PNG_IDAT_READ_SIZE;
1110 #     endif
1111    }
1112
1113 #  ifdef PNG_WRITE_SUPPORTED
1114       else
1115          return png_ptr->zbuffer_size;
1116 #  endif
1117 }
1118
1119 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1120 /* These functions were added to libpng 1.2.6 and were enabled
1121  * by default in libpng-1.4.0 */
1122 png_uint_32 PNGAPI
1123 png_get_user_width_max (png_const_structrp png_ptr)
1124 {
1125    return (png_ptr ? png_ptr->user_width_max : 0);
1126 }
1127
1128 png_uint_32 PNGAPI
1129 png_get_user_height_max (png_const_structrp png_ptr)
1130 {
1131    return (png_ptr ? png_ptr->user_height_max : 0);
1132 }
1133
1134 /* This function was added to libpng 1.4.0 */
1135 png_uint_32 PNGAPI
1136 png_get_chunk_cache_max (png_const_structrp png_ptr)
1137 {
1138    return (png_ptr ? png_ptr->user_chunk_cache_max : 0);
1139 }
1140
1141 /* This function was added to libpng 1.4.1 */
1142 png_alloc_size_t PNGAPI
1143 png_get_chunk_malloc_max (png_const_structrp png_ptr)
1144 {
1145    return (png_ptr ? png_ptr->user_chunk_malloc_max : 0);
1146 }
1147 #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */
1148
1149 /* These functions were added to libpng 1.4.0 */
1150 #ifdef PNG_IO_STATE_SUPPORTED
1151 png_uint_32 PNGAPI
1152 png_get_io_state (png_const_structrp png_ptr)
1153 {
1154    return png_ptr->io_state;
1155 }
1156
1157 png_uint_32 PNGAPI
1158 png_get_io_chunk_type (png_const_structrp png_ptr)
1159 {
1160    return png_ptr->chunk_name;
1161 }
1162 #endif /* ?PNG_IO_STATE_SUPPORTED */
1163
1164 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1165 #  ifdef PNG_GET_PALETTE_MAX_SUPPORTED
1166 int PNGAPI
1167 png_get_palette_max(png_const_structp png_ptr, png_const_infop info_ptr)
1168 {
1169    if (png_ptr != NULL && info_ptr != NULL)
1170       return png_ptr->num_palette_max;
1171
1172    return (-1);
1173 }
1174 #  endif
1175 #endif
1176
1177 #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */