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mGBA Game Boy Advance Emulator

src/third-party/libpng/pngget.c (view raw)

   1
   2/* pngget.c - retrieval of values from info struct
   3 *
   4 * Last changed in libpng 1.6.32 [August 24, 2017]
   5 * Copyright (c) 1998-2002,2004,2006-2017 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 (png_uint_32)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_eXIf_SUPPORTED
 777png_uint_32 PNGAPI
 778png_get_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,
 779    png_bytep *exif)
 780{
 781  png_warning(png_ptr, "png_get_eXIf does not work; use png_get_eXIf_1");
 782  PNG_UNUSED(info_ptr)
 783  PNG_UNUSED(exif)
 784  return 0;
 785}
 786
 787png_uint_32 PNGAPI
 788png_get_eXIf_1(png_const_structrp png_ptr, png_const_inforp info_ptr,
 789    png_uint_32 *num_exif, png_bytep *exif)
 790{
 791   png_debug1(1, "in %s retrieval function", "eXIf");
 792
 793   if (png_ptr != NULL && info_ptr != NULL &&
 794       (info_ptr->valid & PNG_INFO_eXIf) != 0 && exif != NULL)
 795   {
 796      *num_exif = info_ptr->num_exif;
 797      *exif = info_ptr->exif;
 798      return (PNG_INFO_eXIf);
 799   }
 800
 801   return (0);
 802}
 803#endif
 804
 805#ifdef PNG_hIST_SUPPORTED
 806png_uint_32 PNGAPI
 807png_get_hIST(png_const_structrp png_ptr, png_inforp info_ptr,
 808    png_uint_16p *hist)
 809{
 810   png_debug1(1, "in %s retrieval function", "hIST");
 811
 812   if (png_ptr != NULL && info_ptr != NULL &&
 813       (info_ptr->valid & PNG_INFO_hIST) != 0 && hist != NULL)
 814   {
 815      *hist = info_ptr->hist;
 816      return (PNG_INFO_hIST);
 817   }
 818
 819   return (0);
 820}
 821#endif
 822
 823png_uint_32 PNGAPI
 824png_get_IHDR(png_const_structrp png_ptr, png_const_inforp info_ptr,
 825    png_uint_32 *width, png_uint_32 *height, int *bit_depth,
 826    int *color_type, int *interlace_type, int *compression_type,
 827    int *filter_type)
 828{
 829   png_debug1(1, "in %s retrieval function", "IHDR");
 830
 831   if (png_ptr == NULL || info_ptr == NULL)
 832      return (0);
 833
 834   if (width != NULL)
 835       *width = info_ptr->width;
 836
 837   if (height != NULL)
 838       *height = info_ptr->height;
 839
 840   if (bit_depth != NULL)
 841       *bit_depth = info_ptr->bit_depth;
 842
 843   if (color_type != NULL)
 844       *color_type = info_ptr->color_type;
 845
 846   if (compression_type != NULL)
 847      *compression_type = info_ptr->compression_type;
 848
 849   if (filter_type != NULL)
 850      *filter_type = info_ptr->filter_type;
 851
 852   if (interlace_type != NULL)
 853      *interlace_type = info_ptr->interlace_type;
 854
 855   /* This is redundant if we can be sure that the info_ptr values were all
 856    * assigned in png_set_IHDR().  We do the check anyhow in case an
 857    * application has ignored our advice not to mess with the members
 858    * of info_ptr directly.
 859    */
 860   png_check_IHDR(png_ptr, info_ptr->width, info_ptr->height,
 861       info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,
 862       info_ptr->compression_type, info_ptr->filter_type);
 863
 864   return (1);
 865}
 866
 867#ifdef PNG_oFFs_SUPPORTED
 868png_uint_32 PNGAPI
 869png_get_oFFs(png_const_structrp png_ptr, png_const_inforp info_ptr,
 870    png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
 871{
 872   png_debug1(1, "in %s retrieval function", "oFFs");
 873
 874   if (png_ptr != NULL && info_ptr != NULL &&
 875       (info_ptr->valid & PNG_INFO_oFFs) != 0 &&
 876       offset_x != NULL && offset_y != NULL && unit_type != NULL)
 877   {
 878      *offset_x = info_ptr->x_offset;
 879      *offset_y = info_ptr->y_offset;
 880      *unit_type = (int)info_ptr->offset_unit_type;
 881      return (PNG_INFO_oFFs);
 882   }
 883
 884   return (0);
 885}
 886#endif
 887
 888#ifdef PNG_pCAL_SUPPORTED
 889png_uint_32 PNGAPI
 890png_get_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,
 891    png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
 892    png_charp *units, png_charpp *params)
 893{
 894   png_debug1(1, "in %s retrieval function", "pCAL");
 895
 896   if (png_ptr != NULL && info_ptr != NULL &&
 897       (info_ptr->valid & PNG_INFO_pCAL) != 0 &&
 898       purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
 899       nparams != NULL && units != NULL && params != NULL)
 900   {
 901      *purpose = info_ptr->pcal_purpose;
 902      *X0 = info_ptr->pcal_X0;
 903      *X1 = info_ptr->pcal_X1;
 904      *type = (int)info_ptr->pcal_type;
 905      *nparams = (int)info_ptr->pcal_nparams;
 906      *units = info_ptr->pcal_units;
 907      *params = info_ptr->pcal_params;
 908      return (PNG_INFO_pCAL);
 909   }
 910
 911   return (0);
 912}
 913#endif
 914
 915#ifdef PNG_sCAL_SUPPORTED
 916#  ifdef PNG_FIXED_POINT_SUPPORTED
 917#    if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \
 918         defined(PNG_FLOATING_POINT_SUPPORTED)
 919png_uint_32 PNGAPI
 920png_get_sCAL_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,
 921    int *unit, png_fixed_point *width, png_fixed_point *height)
 922{
 923   if (png_ptr != NULL && info_ptr != NULL &&
 924       (info_ptr->valid & PNG_INFO_sCAL) != 0)
 925   {
 926      *unit = info_ptr->scal_unit;
 927      /*TODO: make this work without FP support; the API is currently eliminated
 928       * if neither floating point APIs nor internal floating point arithmetic
 929       * are enabled.
 930       */
 931      *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width");
 932      *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height),
 933          "sCAL height");
 934      return (PNG_INFO_sCAL);
 935   }
 936
 937   return(0);
 938}
 939#    endif /* FLOATING_ARITHMETIC */
 940#  endif /* FIXED_POINT */
 941#  ifdef PNG_FLOATING_POINT_SUPPORTED
 942png_uint_32 PNGAPI
 943png_get_sCAL(png_const_structrp png_ptr, png_const_inforp info_ptr,
 944    int *unit, double *width, double *height)
 945{
 946   if (png_ptr != NULL && info_ptr != NULL &&
 947       (info_ptr->valid & PNG_INFO_sCAL) != 0)
 948   {
 949      *unit = info_ptr->scal_unit;
 950      *width = atof(info_ptr->scal_s_width);
 951      *height = atof(info_ptr->scal_s_height);
 952      return (PNG_INFO_sCAL);
 953   }
 954
 955   return(0);
 956}
 957#  endif /* FLOATING POINT */
 958png_uint_32 PNGAPI
 959png_get_sCAL_s(png_const_structrp png_ptr, png_const_inforp info_ptr,
 960    int *unit, png_charpp width, png_charpp height)
 961{
 962   if (png_ptr != NULL && info_ptr != NULL &&
 963       (info_ptr->valid & PNG_INFO_sCAL) != 0)
 964   {
 965      *unit = info_ptr->scal_unit;
 966      *width = info_ptr->scal_s_width;
 967      *height = info_ptr->scal_s_height;
 968      return (PNG_INFO_sCAL);
 969   }
 970
 971   return(0);
 972}
 973#endif /* sCAL */
 974
 975#ifdef PNG_pHYs_SUPPORTED
 976png_uint_32 PNGAPI
 977png_get_pHYs(png_const_structrp png_ptr, png_const_inforp info_ptr,
 978    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 979{
 980   png_uint_32 retval = 0;
 981
 982   png_debug1(1, "in %s retrieval function", "pHYs");
 983
 984   if (png_ptr != NULL && info_ptr != NULL &&
 985       (info_ptr->valid & PNG_INFO_pHYs) != 0)
 986   {
 987      if (res_x != NULL)
 988      {
 989         *res_x = info_ptr->x_pixels_per_unit;
 990         retval |= PNG_INFO_pHYs;
 991      }
 992
 993      if (res_y != NULL)
 994      {
 995         *res_y = info_ptr->y_pixels_per_unit;
 996         retval |= PNG_INFO_pHYs;
 997      }
 998
 999      if (unit_type != NULL)
1000      {
1001         *unit_type = (int)info_ptr->phys_unit_type;
1002         retval |= PNG_INFO_pHYs;
1003      }
1004   }
1005
1006   return (retval);
1007}
1008#endif /* pHYs */
1009
1010png_uint_32 PNGAPI
1011png_get_PLTE(png_const_structrp png_ptr, png_inforp info_ptr,
1012    png_colorp *palette, int *num_palette)
1013{
1014   png_debug1(1, "in %s retrieval function", "PLTE");
1015
1016   if (png_ptr != NULL && info_ptr != NULL &&
1017       (info_ptr->valid & PNG_INFO_PLTE) != 0 && palette != NULL)
1018   {
1019      *palette = info_ptr->palette;
1020      *num_palette = info_ptr->num_palette;
1021      png_debug1(3, "num_palette = %d", *num_palette);
1022      return (PNG_INFO_PLTE);
1023   }
1024
1025   return (0);
1026}
1027
1028#ifdef PNG_sBIT_SUPPORTED
1029png_uint_32 PNGAPI
1030png_get_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,
1031    png_color_8p *sig_bit)
1032{
1033   png_debug1(1, "in %s retrieval function", "sBIT");
1034
1035   if (png_ptr != NULL && info_ptr != NULL &&
1036       (info_ptr->valid & PNG_INFO_sBIT) != 0 && sig_bit != NULL)
1037   {
1038      *sig_bit = &(info_ptr->sig_bit);
1039      return (PNG_INFO_sBIT);
1040   }
1041
1042   return (0);
1043}
1044#endif
1045
1046#ifdef PNG_TEXT_SUPPORTED
1047int PNGAPI
1048png_get_text(png_const_structrp png_ptr, png_inforp info_ptr,
1049    png_textp *text_ptr, int *num_text)
1050{
1051   if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
1052   {
1053      png_debug1(1, "in 0x%lx retrieval function",
1054         (unsigned long)png_ptr->chunk_name);
1055
1056      if (text_ptr != NULL)
1057         *text_ptr = info_ptr->text;
1058
1059      if (num_text != NULL)
1060         *num_text = info_ptr->num_text;
1061
1062      return info_ptr->num_text;
1063   }
1064
1065   if (num_text != NULL)
1066      *num_text = 0;
1067
1068   return(0);
1069}
1070#endif
1071
1072#ifdef PNG_tIME_SUPPORTED
1073png_uint_32 PNGAPI
1074png_get_tIME(png_const_structrp png_ptr, png_inforp info_ptr,
1075    png_timep *mod_time)
1076{
1077   png_debug1(1, "in %s retrieval function", "tIME");
1078
1079   if (png_ptr != NULL && info_ptr != NULL &&
1080       (info_ptr->valid & PNG_INFO_tIME) != 0 && mod_time != NULL)
1081   {
1082      *mod_time = &(info_ptr->mod_time);
1083      return (PNG_INFO_tIME);
1084   }
1085
1086   return (0);
1087}
1088#endif
1089
1090#ifdef PNG_tRNS_SUPPORTED
1091png_uint_32 PNGAPI
1092png_get_tRNS(png_const_structrp png_ptr, png_inforp info_ptr,
1093    png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
1094{
1095   png_uint_32 retval = 0;
1096   if (png_ptr != NULL && info_ptr != NULL &&
1097       (info_ptr->valid & PNG_INFO_tRNS) != 0)
1098   {
1099      png_debug1(1, "in %s retrieval function", "tRNS");
1100
1101      if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
1102      {
1103         if (trans_alpha != NULL)
1104         {
1105            *trans_alpha = info_ptr->trans_alpha;
1106            retval |= PNG_INFO_tRNS;
1107         }
1108
1109         if (trans_color != NULL)
1110            *trans_color = &(info_ptr->trans_color);
1111      }
1112
1113      else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */
1114      {
1115         if (trans_color != NULL)
1116         {
1117            *trans_color = &(info_ptr->trans_color);
1118            retval |= PNG_INFO_tRNS;
1119         }
1120
1121         if (trans_alpha != NULL)
1122            *trans_alpha = NULL;
1123      }
1124
1125      if (num_trans != NULL)
1126      {
1127         *num_trans = info_ptr->num_trans;
1128         retval |= PNG_INFO_tRNS;
1129      }
1130   }
1131
1132   return (retval);
1133}
1134#endif
1135
1136#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1137int PNGAPI
1138png_get_unknown_chunks(png_const_structrp png_ptr, png_inforp info_ptr,
1139    png_unknown_chunkpp unknowns)
1140{
1141   if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
1142   {
1143      *unknowns = info_ptr->unknown_chunks;
1144      return info_ptr->unknown_chunks_num;
1145   }
1146
1147   return (0);
1148}
1149#endif
1150
1151#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1152png_byte PNGAPI
1153png_get_rgb_to_gray_status (png_const_structrp png_ptr)
1154{
1155   return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0);
1156}
1157#endif
1158
1159#ifdef PNG_USER_CHUNKS_SUPPORTED
1160png_voidp PNGAPI
1161png_get_user_chunk_ptr(png_const_structrp png_ptr)
1162{
1163   return (png_ptr ? png_ptr->user_chunk_ptr : NULL);
1164}
1165#endif
1166
1167png_size_t PNGAPI
1168png_get_compression_buffer_size(png_const_structrp png_ptr)
1169{
1170   if (png_ptr == NULL)
1171      return 0;
1172
1173#ifdef PNG_WRITE_SUPPORTED
1174   if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
1175#endif
1176   {
1177#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1178      return png_ptr->IDAT_read_size;
1179#else
1180      return PNG_IDAT_READ_SIZE;
1181#endif
1182   }
1183
1184#ifdef PNG_WRITE_SUPPORTED
1185   else
1186      return png_ptr->zbuffer_size;
1187#endif
1188}
1189
1190#ifdef PNG_SET_USER_LIMITS_SUPPORTED
1191/* These functions were added to libpng 1.2.6 and were enabled
1192 * by default in libpng-1.4.0 */
1193png_uint_32 PNGAPI
1194png_get_user_width_max (png_const_structrp png_ptr)
1195{
1196   return (png_ptr ? png_ptr->user_width_max : 0);
1197}
1198
1199png_uint_32 PNGAPI
1200png_get_user_height_max (png_const_structrp png_ptr)
1201{
1202   return (png_ptr ? png_ptr->user_height_max : 0);
1203}
1204
1205/* This function was added to libpng 1.4.0 */
1206png_uint_32 PNGAPI
1207png_get_chunk_cache_max (png_const_structrp png_ptr)
1208{
1209   return (png_ptr ? png_ptr->user_chunk_cache_max : 0);
1210}
1211
1212/* This function was added to libpng 1.4.1 */
1213png_alloc_size_t PNGAPI
1214png_get_chunk_malloc_max (png_const_structrp png_ptr)
1215{
1216   return (png_ptr ? png_ptr->user_chunk_malloc_max : 0);
1217}
1218#endif /* SET_USER_LIMITS */
1219
1220/* These functions were added to libpng 1.4.0 */
1221#ifdef PNG_IO_STATE_SUPPORTED
1222png_uint_32 PNGAPI
1223png_get_io_state (png_const_structrp png_ptr)
1224{
1225   return png_ptr->io_state;
1226}
1227
1228png_uint_32 PNGAPI
1229png_get_io_chunk_type (png_const_structrp png_ptr)
1230{
1231   return png_ptr->chunk_name;
1232}
1233#endif /* IO_STATE */
1234
1235#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
1236#  ifdef PNG_GET_PALETTE_MAX_SUPPORTED
1237int PNGAPI
1238png_get_palette_max(png_const_structp png_ptr, png_const_infop info_ptr)
1239{
1240   if (png_ptr != NULL && info_ptr != NULL)
1241      return png_ptr->num_palette_max;
1242
1243   return (-1);
1244}
1245#  endif
1246#endif
1247
1248#endif /* READ || WRITE */