falkTX
/
Carla
mirror of https://github.com/falkTX/Carla
1
0
Fork 0
Code Releases 43 Activity
Audio plugin host https://kx.studio/carla
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
5407 Commits
17 Branches
263MB
Tree: 566c35a3a5
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '566c35a3a5'
${ noResults }
Carla/source/modules/juce_graphics/image_formats/pnglib/pngget.c

1250 lines
33KB
Raw Blame History 

  1. 

  2. /* pngget.c - retrieval of values from info struct

  3.  *

  4.  * Copyright (c) 2018 Cosmin Truta

  5.  * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson

  6.  * Copyright (c) 1996-1997 Andreas Dilger

  7.  * 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. size_t PNGAPI

  30. png_get_rowbytes(png_const_structrp png_ptr, png_const_inforp info_ptr)

  31. {

  32.    if (png_ptr != NULL && info_ptr != NULL)

  33.       return(info_ptr->rowbytes);

  34. 

  35.    return(0);

  36. }

  37. 

  38. #ifdef PNG_INFO_IMAGE_SUPPORTED

  39. png_bytepp PNGAPI

  40. png_get_rows(png_const_structrp png_ptr, png_const_inforp info_ptr)

  41. {

  42.    if (png_ptr != NULL && info_ptr != NULL)

  43.       return(info_ptr->row_pointers);

  44. 

  45.    return(0);

  46. }

  47. #endif

  48. 

  49. #ifdef PNG_EASY_ACCESS_SUPPORTED

  50. /* Easy access to info, added in libpng-0.99 */

  51. png_uint_32 PNGAPI

  52. png_get_image_width(png_const_structrp png_ptr, png_const_inforp info_ptr)

  53. {

  54.    if (png_ptr != NULL && info_ptr != NULL)

  55.       return info_ptr->width;

  56. 

  57.    return (0);

  58. }

  59. 

  60. png_uint_32 PNGAPI

  61. png_get_image_height(png_const_structrp png_ptr, png_const_inforp info_ptr)

  62. {

  63.    if (png_ptr != NULL && info_ptr != NULL)

  64.       return info_ptr->height;

  65. 

  66.    return (0);

  67. }

  68. 

  69. png_byte PNGAPI

  70. png_get_bit_depth(png_const_structrp png_ptr, png_const_inforp info_ptr)

  71. {

  72.    if (png_ptr != NULL && info_ptr != NULL)

  73.       return info_ptr->bit_depth;

  74. 

  75.    return (0);

  76. }

  77. 

  78. png_byte PNGAPI

  79. png_get_color_type(png_const_structrp png_ptr, png_const_inforp info_ptr)

  80. {

  81.    if (png_ptr != NULL && info_ptr != NULL)

  82.       return info_ptr->color_type;

  83. 

  84.    return (0);

  85. }

  86. 

  87. png_byte PNGAPI

  88. png_get_filter_type(png_const_structrp png_ptr, png_const_inforp info_ptr)

  89. {

  90.    if (png_ptr != NULL && info_ptr != NULL)

  91.       return info_ptr->filter_type;

  92. 

  93.    return (0);

  94. }

  95. 

  96. png_byte PNGAPI

  97. png_get_interlace_type(png_const_structrp png_ptr, png_const_inforp info_ptr)

  98. {

  99.    if (png_ptr != NULL && info_ptr != NULL)

  100.       return info_ptr->interlace_type;

  101. 

  102.    return (0);

  103. }

  104. 

  105. png_byte PNGAPI

  106. png_get_compression_type(png_const_structrp png_ptr, png_const_inforp info_ptr)

  107. {

  108.    if (png_ptr != NULL && info_ptr != NULL)

  109.       return info_ptr->compression_type;

  110. 

  111.    return (0);

  112. }

  113. 

  114. png_uint_32 PNGAPI

  115. png_get_x_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp

  116.    info_ptr)

  117. {

  118. #ifdef PNG_pHYs_SUPPORTED

  119.    if (png_ptr != NULL && info_ptr != NULL &&

  120.        (info_ptr->valid & PNG_INFO_pHYs) != 0)

  121.       {

  122.          png_debug1(1, "in %s retrieval function",

  123.              "png_get_x_pixels_per_meter");

  124. 

  125.          if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)

  126.             return (info_ptr->x_pixels_per_unit);

  127.       }

  128. #else

  129.    PNG_UNUSED(png_ptr)

  130.    PNG_UNUSED(info_ptr)

  131. #endif

  132. 

  133.    return (0);

  134. }

  135. 

  136. png_uint_32 PNGAPI

  137. png_get_y_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp

  138.     info_ptr)

  139. {

  140. #ifdef PNG_pHYs_SUPPORTED

  141.    if (png_ptr != NULL && info_ptr != NULL &&

  142.        (info_ptr->valid & PNG_INFO_pHYs) != 0)

  143.    {

  144.       png_debug1(1, "in %s retrieval function",

  145.           "png_get_y_pixels_per_meter");

  146. 

  147.       if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER)

  148.          return (info_ptr->y_pixels_per_unit);

  149.    }

  150. #else

  151.    PNG_UNUSED(png_ptr)

  152.    PNG_UNUSED(info_ptr)

  153. #endif

  154. 

  155.    return (0);

  156. }

  157. 

  158. png_uint_32 PNGAPI

  159. png_get_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr)

  160. {

  161. #ifdef PNG_pHYs_SUPPORTED

  162.    if (png_ptr != NULL && info_ptr != NULL &&

  163.        (info_ptr->valid & PNG_INFO_pHYs) != 0)

  164.    {

  165.       png_debug1(1, "in %s retrieval function", "png_get_pixels_per_meter");

  166. 

  167.       if (info_ptr->phys_unit_type == PNG_RESOLUTION_METER &&

  168.           info_ptr->x_pixels_per_unit == info_ptr->y_pixels_per_unit)

  169.          return (info_ptr->x_pixels_per_unit);

  170.    }

  171. #else

  172.    PNG_UNUSED(png_ptr)

  173.    PNG_UNUSED(info_ptr)

  174. #endif

  175. 

  176.    return (0);

  177. }

  178. 

  179. #ifdef PNG_FLOATING_POINT_SUPPORTED

  180. float PNGAPI

  181. png_get_pixel_aspect_ratio(png_const_structrp png_ptr, png_const_inforp

  182.    info_ptr)

  183. {

  184. #ifdef PNG_READ_pHYs_SUPPORTED

  185.    if (png_ptr != NULL && info_ptr != NULL &&

  186.        (info_ptr->valid & PNG_INFO_pHYs) != 0)

  187.    {

  188.       png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio");

  189. 

  190.       if (info_ptr->x_pixels_per_unit != 0)

  191.          return ((float)((float)info_ptr->y_pixels_per_unit

  192.              /(float)info_ptr->x_pixels_per_unit));

  193.    }

  194. #else

  195.    PNG_UNUSED(png_ptr)

  196.    PNG_UNUSED(info_ptr)

  197. #endif

  198. 

  199.    return ((float)0.0);

  200. }

  201. #endif

  202. 

  203. #ifdef PNG_FIXED_POINT_SUPPORTED

  204. png_fixed_point PNGAPI

  205. png_get_pixel_aspect_ratio_fixed(png_const_structrp png_ptr,

  206.     png_const_inforp info_ptr)

  207. {

  208. #ifdef PNG_READ_pHYs_SUPPORTED

  209.    if (png_ptr != NULL && info_ptr != NULL &&

  210.        (info_ptr->valid & PNG_INFO_pHYs) != 0 &&

  211.        info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0 &&

  212.        info_ptr->x_pixels_per_unit <= PNG_UINT_31_MAX &&

  213.        info_ptr->y_pixels_per_unit <= PNG_UINT_31_MAX)

  214.    {

  215.       png_fixed_point res;

  216. 

  217.       png_debug1(1, "in %s retrieval function", "png_get_aspect_ratio_fixed");

  218. 

  219.       /* The following casts work because a PNG 4 byte integer only has a valid

  220.        * range of 0..2^31-1; otherwise the cast might overflow.

  221.        */

  222.       if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1,

  223.           (png_int_32)info_ptr->x_pixels_per_unit) != 0)

  224.          return res;

  225.    }

  226. #else

  227.    PNG_UNUSED(png_ptr)

  228.    PNG_UNUSED(info_ptr)

  229. #endif

  230. 

  231.    return 0;

  232. }

  233. #endif

  234. 

  235. png_int_32 PNGAPI

  236. png_get_x_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)

  237. {

  238. #ifdef PNG_oFFs_SUPPORTED

  239.    if (png_ptr != NULL && info_ptr != NULL &&

  240.        (info_ptr->valid & PNG_INFO_oFFs) != 0)

  241.    {

  242.       png_debug1(1, "in %s retrieval function", "png_get_x_offset_microns");

  243. 

  244.       if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)

  245.          return (info_ptr->x_offset);

  246.    }

  247. #else

  248.    PNG_UNUSED(png_ptr)

  249.    PNG_UNUSED(info_ptr)

  250. #endif

  251. 

  252.    return (0);

  253. }

  254. 

  255. png_int_32 PNGAPI

  256. png_get_y_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)

  257. {

  258. #ifdef PNG_oFFs_SUPPORTED

  259.    if (png_ptr != NULL && info_ptr != NULL &&

  260.        (info_ptr->valid & PNG_INFO_oFFs) != 0)

  261.    {

  262.       png_debug1(1, "in %s retrieval function", "png_get_y_offset_microns");

  263. 

  264.       if (info_ptr->offset_unit_type == PNG_OFFSET_MICROMETER)

  265.          return (info_ptr->y_offset);

  266.    }

  267. #else

  268.    PNG_UNUSED(png_ptr)

  269.    PNG_UNUSED(info_ptr)

  270. #endif

  271. 

  272.    return (0);

  273. }

  274. 

  275. png_int_32 PNGAPI

  276. png_get_x_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)

  277. {

  278. #ifdef PNG_oFFs_SUPPORTED

  279.    if (png_ptr != NULL && info_ptr != NULL &&

  280.        (info_ptr->valid & PNG_INFO_oFFs) != 0)

  281.    {

  282.       png_debug1(1, "in %s retrieval function", "png_get_x_offset_pixels");

  283. 

  284.       if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)

  285.          return (info_ptr->x_offset);

  286.    }

  287. #else

  288.    PNG_UNUSED(png_ptr)

  289.    PNG_UNUSED(info_ptr)

  290. #endif

  291. 

  292.    return (0);

  293. }

  294. 

  295. png_int_32 PNGAPI

  296. png_get_y_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)

  297. {

  298. #ifdef PNG_oFFs_SUPPORTED

  299.    if (png_ptr != NULL && info_ptr != NULL &&

  300.        (info_ptr->valid & PNG_INFO_oFFs) != 0)

  301.    {

  302.       png_debug1(1, "in %s retrieval function", "png_get_y_offset_pixels");

  303. 

  304.       if (info_ptr->offset_unit_type == PNG_OFFSET_PIXEL)

  305.          return (info_ptr->y_offset);

  306.    }

  307. #else

  308.    PNG_UNUSED(png_ptr)

  309.    PNG_UNUSED(info_ptr)

  310. #endif

  311. 

  312.    return (0);

  313. }

  314. 

  315. #ifdef PNG_INCH_CONVERSIONS_SUPPORTED

  316. static png_uint_32

  317. ppi_from_ppm(png_uint_32 ppm)

  318. {

  319. #if 0

  320.    /* The conversion is *(2.54/100), in binary (32 digits):

  321.     * .00000110100000001001110101001001

  322.     */

  323.    png_uint_32 t1001, t1101;

  324.    ppm >>= 1;                  /* .1 */

  325.    t1001 = ppm + (ppm >> 3);   /* .1001 */

  326.    t1101 = t1001 + (ppm >> 1); /* .1101 */

  327.    ppm >>= 20;                 /* .000000000000000000001 */

  328.    t1101 += t1101 >> 15;       /* .1101000000000001101 */

  329.    t1001 >>= 11;               /* .000000000001001 */

  330.    t1001 += t1001 >> 12;       /* .000000000001001000000001001 */

  331.    ppm += t1001;               /* .000000000001001000001001001 */

  332.    ppm += t1101;               /* .110100000001001110101001001 */

  333.    return (ppm + 16) >> 5;/* .00000110100000001001110101001001 */

  334. #else

  335.    /* The argument is a PNG unsigned integer, so it is not permitted

  336.     * to be bigger than 2^31.

  337.     */

  338.    png_fixed_point result;

  339.    if (ppm <= PNG_UINT_31_MAX && png_muldiv(&result, (png_int_32)ppm, 127,

  340.        5000) != 0)

  341.       return (png_uint_32)result;

  342. 

  343.    /* Overflow. */

  344.    return 0;

  345. #endif

  346. }

  347. 

  348. png_uint_32 PNGAPI

  349. png_get_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)

  350. {

  351.    return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));

  352. }

  353. 

  354. png_uint_32 PNGAPI

  355. png_get_x_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)

  356. {

  357.    return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr));

  358. }

  359. 

  360. png_uint_32 PNGAPI

  361. png_get_y_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)

  362. {

  363.    return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr));

  364. }

  365. 

  366. #ifdef PNG_FIXED_POINT_SUPPORTED

  367. static png_fixed_point

  368. png_fixed_inches_from_microns(png_const_structrp png_ptr, png_int_32 microns)

  369. {

  370.    /* Convert from meters * 1,000,000 to inches * 100,000, meters to

  371.     * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127.

  372.     * Notice that this can overflow - a warning is output and 0 is

  373.     * returned.

  374.     */

  375.    return png_muldiv_warn(png_ptr, microns, 500, 127);

  376. }

  377. 

  378. png_fixed_point PNGAPI

  379. png_get_x_offset_inches_fixed(png_const_structrp png_ptr,

  380.     png_const_inforp info_ptr)

  381. {

  382.    return png_fixed_inches_from_microns(png_ptr,

  383.        png_get_x_offset_microns(png_ptr, info_ptr));

  384. }

  385. #endif

  386. 

  387. #ifdef PNG_FIXED_POINT_SUPPORTED

  388. png_fixed_point PNGAPI

  389. png_get_y_offset_inches_fixed(png_const_structrp png_ptr,

  390.     png_const_inforp info_ptr)

  391. {

  392.    return png_fixed_inches_from_microns(png_ptr,

  393.        png_get_y_offset_microns(png_ptr, info_ptr));

  394. }

  395. #endif

  396. 

  397. #ifdef PNG_FLOATING_POINT_SUPPORTED

  398. float PNGAPI

  399. png_get_x_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)

  400. {

  401.    /* To avoid the overflow do the conversion directly in floating

  402.     * point.

  403.     */

  404.    return (float)(png_get_x_offset_microns(png_ptr, info_ptr) * .00003937);

  405. }

  406. #endif

  407. 

  408. #ifdef PNG_FLOATING_POINT_SUPPORTED

  409. float PNGAPI

  410. png_get_y_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)

  411. {

  412.    /* To avoid the overflow do the conversion directly in floating

  413.     * point.

  414.     */

  415.    return (float)(png_get_y_offset_microns(png_ptr, info_ptr) * .00003937);

  416. }

  417. #endif

  418. 

  419. #ifdef PNG_pHYs_SUPPORTED

  420. png_uint_32 PNGAPI

  421. png_get_pHYs_dpi(png_const_structrp png_ptr, png_const_inforp info_ptr,

  422.     png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)

  423. {

  424.    png_uint_32 retval = 0;

  425. 

  426.    if (png_ptr != NULL && info_ptr != NULL &&

  427.        (info_ptr->valid & PNG_INFO_pHYs) != 0)

  428.    {

  429.       png_debug1(1, "in %s retrieval function", "pHYs");

  430. 

  431.       if (res_x != NULL)

  432.       {

  433.          *res_x = info_ptr->x_pixels_per_unit;

  434.          retval |= PNG_INFO_pHYs;

  435.       }

  436. 

  437.       if (res_y != NULL)

  438.       {

  439.          *res_y = info_ptr->y_pixels_per_unit;

  440.          retval |= PNG_INFO_pHYs;

  441.       }

  442. 

  443.       if (unit_type != NULL)

  444.       {

  445.          *unit_type = (int)info_ptr->phys_unit_type;

  446.          retval |= PNG_INFO_pHYs;

  447. 

  448.          if (*unit_type == 1)

  449.          {

  450.             if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);

  451.             if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);

  452.          }

  453.       }

  454.    }

  455. 

  456.    return (retval);

  457. }

  458. #endif /* pHYs */

  459. #endif /* INCH_CONVERSIONS */

  460. 

  461. /* png_get_channels really belongs in here, too, but it's been around longer */

  462. 

  463. #endif /* EASY_ACCESS */

  464. 

  465. 

  466. png_byte PNGAPI

  467. png_get_channels(png_const_structrp png_ptr, png_const_inforp info_ptr)

  468. {

  469.    if (png_ptr != NULL && info_ptr != NULL)

  470.       return(info_ptr->channels);

  471. 

  472.    return (0);

  473. }

  474. 

  475. #ifdef PNG_READ_SUPPORTED

  476. png_const_bytep PNGAPI

  477. png_get_signature(png_const_structrp png_ptr, png_const_inforp info_ptr)

  478. {

  479.    if (png_ptr != NULL && info_ptr != NULL)

  480.       return(info_ptr->signature);

  481. 

  482.    return (NULL);

  483. }

  484. #endif

  485. 

  486. #ifdef PNG_bKGD_SUPPORTED

  487. png_uint_32 PNGAPI

  488. png_get_bKGD(png_const_structrp png_ptr, png_inforp info_ptr,

  489.     png_color_16p *background)

  490. {

  491.    if (png_ptr != NULL && info_ptr != NULL &&

  492.        (info_ptr->valid & PNG_INFO_bKGD) != 0 &&

  493.        background != NULL)

  494.    {

  495.       png_debug1(1, "in %s retrieval function", "bKGD");

  496. 

  497.       *background = &(info_ptr->background);

  498.       return (PNG_INFO_bKGD);

  499.    }

  500. 

  501.    return (0);

  502. }

  503. #endif

  504. 

  505. #ifdef PNG_cHRM_SUPPORTED

  506. /* The XYZ APIs were added in 1.5.5 to take advantage of the code added at the

  507.  * same time to correct the rgb grayscale coefficient defaults obtained from the

  508.  * cHRM chunk in 1.5.4

  509.  */

  510. #  ifdef PNG_FLOATING_POINT_SUPPORTED

  511. png_uint_32 PNGAPI

  512. png_get_cHRM(png_const_structrp png_ptr, png_const_inforp info_ptr,

  513.     double *white_x, double *white_y, double *red_x, double *red_y,

  514.     double *green_x, double *green_y, double *blue_x, double *blue_y)

  515. {

  516.    /* Quiet API change: this code used to only return the end points if a cHRM

  517.     * chunk was present, but the end points can also come from iCCP or sRGB

  518.     * chunks, so in 1.6.0 the png_get_ APIs return the end points regardless and

  519.     * the png_set_ APIs merely check that set end points are mutually

  520.     * consistent.

  521.     */

  522.    if (png_ptr != NULL && info_ptr != NULL &&

  523.       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)

  524.    {

  525.       png_debug1(1, "in %s retrieval function", "cHRM");

  526. 

  527.       if (white_x != NULL)

  528.          *white_x = png_float(png_ptr,

  529.              info_ptr->colorspace.end_points_xy.whitex, "cHRM white X");

  530.       if (white_y != NULL)

  531.          *white_y = png_float(png_ptr,

  532.              info_ptr->colorspace.end_points_xy.whitey, "cHRM white Y");

  533.       if (red_x != NULL)

  534.          *red_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redx,

  535.              "cHRM red X");

  536.       if (red_y != NULL)

  537.          *red_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redy,

  538.              "cHRM red Y");

  539.       if (green_x != NULL)

  540.          *green_x = png_float(png_ptr,

  541.              info_ptr->colorspace.end_points_xy.greenx, "cHRM green X");

  542.       if (green_y != NULL)

  543.          *green_y = png_float(png_ptr,

  544.              info_ptr->colorspace.end_points_xy.greeny, "cHRM green Y");

  545.       if (blue_x != NULL)

  546.          *blue_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluex,

  547.              "cHRM blue X");

  548.       if (blue_y != NULL)

  549.          *blue_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluey,

  550.              "cHRM blue Y");

  551.       return (PNG_INFO_cHRM);

  552.    }

  553. 

  554.    return (0);

  555. }

  556. 

  557. png_uint_32 PNGAPI

  558. png_get_cHRM_XYZ(png_const_structrp png_ptr, png_const_inforp info_ptr,

  559.     double *red_X, double *red_Y, double *red_Z, double *green_X,

  560.     double *green_Y, double *green_Z, double *blue_X, double *blue_Y,

  561.     double *blue_Z)

  562. {

  563.    if (png_ptr != NULL && info_ptr != NULL &&

  564.        (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)

  565.    {

  566.       png_debug1(1, "in %s retrieval function", "cHRM_XYZ(float)");

  567. 

  568.       if (red_X != NULL)

  569.          *red_X = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_X,

  570.              "cHRM red X");

  571.       if (red_Y != NULL)

  572.          *red_Y = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Y,

  573.              "cHRM red Y");

  574.       if (red_Z != NULL)

  575.          *red_Z = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Z,

  576.              "cHRM red Z");

  577.       if (green_X != NULL)

  578.          *green_X = png_float(png_ptr,

  579.              info_ptr->colorspace.end_points_XYZ.green_X, "cHRM green X");

  580.       if (green_Y != NULL)

  581.          *green_Y = png_float(png_ptr,

  582.              info_ptr->colorspace.end_points_XYZ.green_Y, "cHRM green Y");

  583.       if (green_Z != NULL)

  584.          *green_Z = png_float(png_ptr,

  585.              info_ptr->colorspace.end_points_XYZ.green_Z, "cHRM green Z");

  586.       if (blue_X != NULL)

  587.          *blue_X = png_float(png_ptr,

  588.              info_ptr->colorspace.end_points_XYZ.blue_X, "cHRM blue X");

  589.       if (blue_Y != NULL)

  590.          *blue_Y = png_float(png_ptr,

  591.              info_ptr->colorspace.end_points_XYZ.blue_Y, "cHRM blue Y");

  592.       if (blue_Z != NULL)

  593.          *blue_Z = png_float(png_ptr,

  594.              info_ptr->colorspace.end_points_XYZ.blue_Z, "cHRM blue Z");

  595.       return (PNG_INFO_cHRM);

  596.    }

  597. 

  598.    return (0);

  599. }

  600. #  endif

  601. 

  602. #  ifdef PNG_FIXED_POINT_SUPPORTED

  603. png_uint_32 PNGAPI

  604. png_get_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,

  605.     png_fixed_point *int_red_X, png_fixed_point *int_red_Y,

  606.     png_fixed_point *int_red_Z, png_fixed_point *int_green_X,

  607.     png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,

  608.     png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,

  609.     png_fixed_point *int_blue_Z)

  610. {

  611.    if (png_ptr != NULL && info_ptr != NULL &&

  612.       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)

  613.    {

  614.       png_debug1(1, "in %s retrieval function", "cHRM_XYZ");

  615. 

  616.       if (int_red_X != NULL)

  617.          *int_red_X = info_ptr->colorspace.end_points_XYZ.red_X;

  618.       if (int_red_Y != NULL)

  619.          *int_red_Y = info_ptr->colorspace.end_points_XYZ.red_Y;

  620.       if (int_red_Z != NULL)

  621.          *int_red_Z = info_ptr->colorspace.end_points_XYZ.red_Z;

  622.       if (int_green_X != NULL)

  623.          *int_green_X = info_ptr->colorspace.end_points_XYZ.green_X;

  624.       if (int_green_Y != NULL)

  625.          *int_green_Y = info_ptr->colorspace.end_points_XYZ.green_Y;

  626.       if (int_green_Z != NULL)

  627.          *int_green_Z = info_ptr->colorspace.end_points_XYZ.green_Z;

  628.       if (int_blue_X != NULL)

  629.          *int_blue_X = info_ptr->colorspace.end_points_XYZ.blue_X;

  630.       if (int_blue_Y != NULL)

  631.          *int_blue_Y = info_ptr->colorspace.end_points_XYZ.blue_Y;

  632.       if (int_blue_Z != NULL)

  633.          *int_blue_Z = info_ptr->colorspace.end_points_XYZ.blue_Z;

  634.       return (PNG_INFO_cHRM);

  635.    }

  636. 

  637.    return (0);

  638. }

  639. 

  640. png_uint_32 PNGAPI

  641. png_get_cHRM_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,

  642.     png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,

  643.     png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,

  644.     png_fixed_point *blue_x, png_fixed_point *blue_y)

  645. {

  646.    png_debug1(1, "in %s retrieval function", "cHRM");

  647. 

  648.    if (png_ptr != NULL && info_ptr != NULL &&

  649.       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0)

  650.    {

  651.       if (white_x != NULL)

  652.          *white_x = info_ptr->colorspace.end_points_xy.whitex;

  653.       if (white_y != NULL)

  654.          *white_y = info_ptr->colorspace.end_points_xy.whitey;

  655.       if (red_x != NULL)

  656.          *red_x = info_ptr->colorspace.end_points_xy.redx;

  657.       if (red_y != NULL)

  658.          *red_y = info_ptr->colorspace.end_points_xy.redy;

  659.       if (green_x != NULL)

  660.          *green_x = info_ptr->colorspace.end_points_xy.greenx;

  661.       if (green_y != NULL)

  662.          *green_y = info_ptr->colorspace.end_points_xy.greeny;

  663.       if (blue_x != NULL)

  664.          *blue_x = info_ptr->colorspace.end_points_xy.bluex;

  665.       if (blue_y != NULL)

  666.          *blue_y = info_ptr->colorspace.end_points_xy.bluey;

  667.       return (PNG_INFO_cHRM);

  668.    }

  669. 

  670.    return (0);

  671. }

  672. #  endif

  673. #endif

  674. 

  675. #ifdef PNG_gAMA_SUPPORTED

  676. #  ifdef PNG_FIXED_POINT_SUPPORTED

  677. png_uint_32 PNGAPI

  678. png_get_gAMA_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,

  679.     png_fixed_point *file_gamma)

  680. {

  681.    png_debug1(1, "in %s retrieval function", "gAMA");

  682. 

  683.    if (png_ptr != NULL && info_ptr != NULL &&

  684.        (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 &&

  685.        file_gamma != NULL)

  686.    {

  687.       *file_gamma = info_ptr->colorspace.gamma;

  688.       return (PNG_INFO_gAMA);

  689.    }

  690. 

  691.    return (0);

  692. }

  693. #  endif

  694. 

  695. #  ifdef PNG_FLOATING_POINT_SUPPORTED

  696. png_uint_32 PNGAPI

  697. png_get_gAMA(png_const_structrp png_ptr, png_const_inforp info_ptr,

  698.     double *file_gamma)

  699. {

  700.    png_debug1(1, "in %s retrieval function", "gAMA(float)");

  701. 

  702.    if (png_ptr != NULL && info_ptr != NULL &&

  703.       (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 &&

  704.       file_gamma != NULL)

  705.    {

  706.       *file_gamma = png_float(png_ptr, info_ptr->colorspace.gamma,

  707.           "png_get_gAMA");

  708.       return (PNG_INFO_gAMA);

  709.    }

  710. 

  711.    return (0);

  712. }

  713. #  endif

  714. #endif

  715. 

  716. #ifdef PNG_sRGB_SUPPORTED

  717. png_uint_32 PNGAPI

  718. png_get_sRGB(png_const_structrp png_ptr, png_const_inforp info_ptr,

  719.     int *file_srgb_intent)

  720. {

  721.    png_debug1(1, "in %s retrieval function", "sRGB");

  722. 

  723.    if (png_ptr != NULL && info_ptr != NULL &&

  724.       (info_ptr->valid & PNG_INFO_sRGB) != 0 && file_srgb_intent != NULL)

  725.    {

  726.       *file_srgb_intent = info_ptr->colorspace.rendering_intent;

  727.       return (PNG_INFO_sRGB);

  728.    }

  729. 

  730.    return (0);

  731. }

  732. #endif

  733. 

  734. #ifdef PNG_iCCP_SUPPORTED

  735. png_uint_32 PNGAPI

  736. png_get_iCCP(png_const_structrp png_ptr, png_inforp info_ptr,

  737.     png_charpp name, int *compression_type,

  738.     png_bytepp profile, png_uint_32 *proflen)

  739. {

  740.    png_debug1(1, "in %s retrieval function", "iCCP");

  741. 

  742.    if (png_ptr != NULL && info_ptr != NULL &&

  743.        (info_ptr->valid & PNG_INFO_iCCP) != 0 &&

  744.        name != NULL && profile != NULL && proflen != NULL)

  745.    {

  746.       *name = info_ptr->iccp_name;

  747.       *profile = info_ptr->iccp_profile;

  748.       *proflen = png_get_uint_32(info_ptr->iccp_profile);

  749.       /* This is somewhat irrelevant since the profile data returned has

  750.        * actually been uncompressed.

  751.        */

  752.       if (compression_type != NULL)

  753.          *compression_type = PNG_COMPRESSION_TYPE_BASE;

  754.       return (PNG_INFO_iCCP);

  755.    }

  756. 

  757.    return (0);

  758. 

  759. }

  760. #endif

  761. 

  762. #ifdef PNG_sPLT_SUPPORTED

  763. int PNGAPI

  764. png_get_sPLT(png_const_structrp png_ptr, png_inforp info_ptr,

  765.     png_sPLT_tpp spalettes)

  766. {

  767.    if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)

  768.    {

  769.       *spalettes = info_ptr->splt_palettes;

  770.       return info_ptr->splt_palettes_num;

  771.    }

  772. 

  773.    return (0);

  774. }

  775. #endif

  776. 

  777. #ifdef PNG_eXIf_SUPPORTED

  778. png_uint_32 PNGAPI

  779. png_get_eXIf(png_const_structrp png_ptr, png_inforp info_ptr,

  780.     png_bytep *exif)

  781. {

  782.   png_warning(png_ptr, "png_get_eXIf does not work; use png_get_eXIf_1");

  783.   PNG_UNUSED(info_ptr)

  784.   PNG_UNUSED(exif)

  785.   return 0;

  786. }

  787. 

  788. png_uint_32 PNGAPI

  789. png_get_eXIf_1(png_const_structrp png_ptr, png_const_inforp info_ptr,

  790.     png_uint_32 *num_exif, png_bytep *exif)

  791. {

  792.    png_debug1(1, "in %s retrieval function", "eXIf");

  793. 

  794.    if (png_ptr != NULL && info_ptr != NULL &&

  795.        (info_ptr->valid & PNG_INFO_eXIf) != 0 && exif != NULL)

  796.    {

  797.       *num_exif = info_ptr->num_exif;

  798.       *exif = info_ptr->exif;

  799.       return (PNG_INFO_eXIf);

  800.    }

  801. 

  802.    return (0);

  803. }

  804. #endif

  805. 

  806. #ifdef PNG_hIST_SUPPORTED

  807. png_uint_32 PNGAPI

  808. png_get_hIST(png_const_structrp png_ptr, png_inforp info_ptr,

  809.     png_uint_16p *hist)

  810. {

  811.    png_debug1(1, "in %s retrieval function", "hIST");

  812. 

  813.    if (png_ptr != NULL && info_ptr != NULL &&

  814.        (info_ptr->valid & PNG_INFO_hIST) != 0 && hist != NULL)

  815.    {

  816.       *hist = info_ptr->hist;

  817.       return (PNG_INFO_hIST);

  818.    }

  819. 

  820.    return (0);

  821. }

  822. #endif

  823. 

  824. png_uint_32 PNGAPI

  825. png_get_IHDR(png_const_structrp png_ptr, png_const_inforp info_ptr,

  826.     png_uint_32 *width, png_uint_32 *height, int *bit_depth,

  827.     int *color_type, int *interlace_type, int *compression_type,

  828.     int *filter_type)

  829. {

  830.    png_debug1(1, "in %s retrieval function", "IHDR");

  831. 

  832.    if (png_ptr == NULL || info_ptr == NULL)

  833.       return (0);

  834. 

  835.    if (width != NULL)

  836.        *width = info_ptr->width;

  837. 

  838.    if (height != NULL)

  839.        *height = info_ptr->height;

  840. 

  841.    if (bit_depth != NULL)

  842.        *bit_depth = info_ptr->bit_depth;

  843. 

  844.    if (color_type != NULL)

  845.        *color_type = info_ptr->color_type;

  846. 

  847.    if (compression_type != NULL)

  848.       *compression_type = info_ptr->compression_type;

  849. 

  850.    if (filter_type != NULL)

  851.       *filter_type = info_ptr->filter_type;

  852. 

  853.    if (interlace_type != NULL)

  854.       *interlace_type = info_ptr->interlace_type;

  855. 

  856.    /* This is redundant if we can be sure that the info_ptr values were all

  857.     * assigned in png_set_IHDR().  We do the check anyhow in case an

  858.     * application has ignored our advice not to mess with the members

  859.     * of info_ptr directly.

  860.     */

  861.    png_check_IHDR(png_ptr, info_ptr->width, info_ptr->height,

  862.        info_ptr->bit_depth, info_ptr->color_type, info_ptr->interlace_type,

  863.        info_ptr->compression_type, info_ptr->filter_type);

  864. 

  865.    return (1);

  866. }

  867. 

  868. #ifdef PNG_oFFs_SUPPORTED

  869. png_uint_32 PNGAPI

  870. png_get_oFFs(png_const_structrp png_ptr, png_const_inforp info_ptr,

  871.     png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)

  872. {

  873.    png_debug1(1, "in %s retrieval function", "oFFs");

  874. 

  875.    if (png_ptr != NULL && info_ptr != NULL &&

  876.        (info_ptr->valid & PNG_INFO_oFFs) != 0 &&

  877.        offset_x != NULL && offset_y != NULL && unit_type != NULL)

  878.    {

  879.       *offset_x = info_ptr->x_offset;

  880.       *offset_y = info_ptr->y_offset;

  881.       *unit_type = (int)info_ptr->offset_unit_type;

  882.       return (PNG_INFO_oFFs);

  883.    }

  884. 

  885.    return (0);

  886. }

  887. #endif

  888. 

  889. #ifdef PNG_pCAL_SUPPORTED

  890. png_uint_32 PNGAPI

  891. png_get_pCAL(png_const_structrp png_ptr, png_inforp info_ptr,

  892.     png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,

  893.     png_charp *units, png_charpp *params)

  894. {

  895.    png_debug1(1, "in %s retrieval function", "pCAL");

  896. 

  897.    if (png_ptr != NULL && info_ptr != NULL &&

  898.        (info_ptr->valid & PNG_INFO_pCAL) != 0 &&

  899.        purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&

  900.        nparams != NULL && units != NULL && params != NULL)

  901.    {

  902.       *purpose = info_ptr->pcal_purpose;

  903.       *X0 = info_ptr->pcal_X0;

  904.       *X1 = info_ptr->pcal_X1;

  905.       *type = (int)info_ptr->pcal_type;

  906.       *nparams = (int)info_ptr->pcal_nparams;

  907.       *units = info_ptr->pcal_units;

  908.       *params = info_ptr->pcal_params;

  909.       return (PNG_INFO_pCAL);

  910.    }

  911. 

  912.    return (0);

  913. }

  914. #endif

  915. 

  916. #ifdef PNG_sCAL_SUPPORTED

  917. #  ifdef PNG_FIXED_POINT_SUPPORTED

  918. #    if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \

  919.          defined(PNG_FLOATING_POINT_SUPPORTED)

  920. png_uint_32 PNGAPI

  921. png_get_sCAL_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr,

  922.     int *unit, png_fixed_point *width, png_fixed_point *height)

  923. {

  924.    if (png_ptr != NULL && info_ptr != NULL &&

  925.        (info_ptr->valid & PNG_INFO_sCAL) != 0)

  926.    {

  927.       *unit = info_ptr->scal_unit;

  928.       /*TODO: make this work without FP support; the API is currently eliminated

  929.        * if neither floating point APIs nor internal floating point arithmetic

  930.        * are enabled.

  931.        */

  932.       *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width");

  933.       *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height),

  934.           "sCAL height");

  935.       return (PNG_INFO_sCAL);

  936.    }

  937. 

  938.    return(0);

  939. }

  940. #    endif /* FLOATING_ARITHMETIC */

  941. #  endif /* FIXED_POINT */

  942. #  ifdef PNG_FLOATING_POINT_SUPPORTED

  943. png_uint_32 PNGAPI

  944. png_get_sCAL(png_const_structrp png_ptr, png_const_inforp info_ptr,

  945.     int *unit, double *width, double *height)

  946. {

  947.    if (png_ptr != NULL && info_ptr != NULL &&

  948.        (info_ptr->valid & PNG_INFO_sCAL) != 0)

  949.    {

  950.       *unit = info_ptr->scal_unit;

  951.       *width = atof(info_ptr->scal_s_width);

  952.       *height = atof(info_ptr->scal_s_height);

  953.       return (PNG_INFO_sCAL);

  954.    }

  955. 

  956.    return(0);

  957. }

  958. #  endif /* FLOATING POINT */

  959. png_uint_32 PNGAPI

  960. png_get_sCAL_s(png_const_structrp png_ptr, png_const_inforp info_ptr,

  961.     int *unit, png_charpp width, png_charpp height)

  962. {

  963.    if (png_ptr != NULL && info_ptr != NULL &&

  964.        (info_ptr->valid & PNG_INFO_sCAL) != 0)

  965.    {

  966.       *unit = info_ptr->scal_unit;

  967.       *width = info_ptr->scal_s_width;

  968.       *height = info_ptr->scal_s_height;

  969.       return (PNG_INFO_sCAL);

  970.    }

  971. 

  972.    return(0);

  973. }

  974. #endif /* sCAL */

  975. 

  976. #ifdef PNG_pHYs_SUPPORTED

  977. png_uint_32 PNGAPI

  978. png_get_pHYs(png_const_structrp png_ptr, png_const_inforp info_ptr,

  979.     png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)

  980. {

  981.    png_uint_32 retval = 0;

  982. 

  983.    png_debug1(1, "in %s retrieval function", "pHYs");

  984. 

  985.    if (png_ptr != NULL && info_ptr != NULL &&

  986.        (info_ptr->valid & PNG_INFO_pHYs) != 0)

  987.    {

  988.       if (res_x != NULL)

  989.       {

  990.          *res_x = info_ptr->x_pixels_per_unit;

  991.          retval |= PNG_INFO_pHYs;

  992.       }

  993. 

  994.       if (res_y != NULL)

  995.       {

  996.          *res_y = info_ptr->y_pixels_per_unit;

  997.          retval |= PNG_INFO_pHYs;

  998.       }

  999. 

  1000.       if (unit_type != NULL)

  1001.       {

  1002.          *unit_type = (int)info_ptr->phys_unit_type;

  1003.          retval |= PNG_INFO_pHYs;

  1004.       }

  1005.    }

  1006. 

  1007.    return (retval);

  1008. }

  1009. #endif /* pHYs */

  1010. 

  1011. png_uint_32 PNGAPI

  1012. png_get_PLTE(png_const_structrp png_ptr, png_inforp info_ptr,

  1013.     png_colorp *palette, int *num_palette)

  1014. {

  1015.    png_debug1(1, "in %s retrieval function", "PLTE");

  1016. 

  1017.    if (png_ptr != NULL && info_ptr != NULL &&

  1018.        (info_ptr->valid & PNG_INFO_PLTE) != 0 && palette != NULL)

  1019.    {

  1020.       *palette = info_ptr->palette;

  1021.       *num_palette = info_ptr->num_palette;

  1022.       png_debug1(3, "num_palette = %d", *num_palette);

  1023.       return (PNG_INFO_PLTE);

  1024.    }

  1025. 

  1026.    return (0);

  1027. }

  1028. 

  1029. #ifdef PNG_sBIT_SUPPORTED

  1030. png_uint_32 PNGAPI

  1031. png_get_sBIT(png_const_structrp png_ptr, png_inforp info_ptr,

  1032.     png_color_8p *sig_bit)

  1033. {

  1034.    png_debug1(1, "in %s retrieval function", "sBIT");

  1035. 

  1036.    if (png_ptr != NULL && info_ptr != NULL &&

  1037.        (info_ptr->valid & PNG_INFO_sBIT) != 0 && sig_bit != NULL)

  1038.    {

  1039.       *sig_bit = &(info_ptr->sig_bit);

  1040.       return (PNG_INFO_sBIT);

  1041.    }

  1042. 

  1043.    return (0);

  1044. }

  1045. #endif

  1046. 

  1047. #ifdef PNG_TEXT_SUPPORTED

  1048. int PNGAPI

  1049. png_get_text(png_const_structrp png_ptr, png_inforp info_ptr,

  1050.     png_textp *text_ptr, int *num_text)

  1051. {

  1052.    if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)

  1053.    {

  1054.       png_debug1(1, "in 0x%lx retrieval function",

  1055.          (unsigned long)png_ptr->chunk_name);

  1056. 

  1057.       if (text_ptr != NULL)

  1058.          *text_ptr = info_ptr->text;

  1059. 

  1060.       if (num_text != NULL)

  1061.          *num_text = info_ptr->num_text;

  1062. 

  1063.       return info_ptr->num_text;

  1064.    }

  1065. 

  1066.    if (num_text != NULL)

  1067.       *num_text = 0;

  1068. 

  1069.    return(0);

  1070. }

  1071. #endif

  1072. 

  1073. #ifdef PNG_tIME_SUPPORTED

  1074. png_uint_32 PNGAPI

  1075. png_get_tIME(png_const_structrp png_ptr, png_inforp info_ptr,

  1076.     png_timep *mod_time)

  1077. {

  1078.    png_debug1(1, "in %s retrieval function", "tIME");

  1079. 

  1080.    if (png_ptr != NULL && info_ptr != NULL &&

  1081.        (info_ptr->valid & PNG_INFO_tIME) != 0 && mod_time != NULL)

  1082.    {

  1083.       *mod_time = &(info_ptr->mod_time);

  1084.       return (PNG_INFO_tIME);

  1085.    }

  1086. 

  1087.    return (0);

  1088. }

  1089. #endif

  1090. 

  1091. #ifdef PNG_tRNS_SUPPORTED

  1092. png_uint_32 PNGAPI

  1093. png_get_tRNS(png_const_structrp png_ptr, png_inforp info_ptr,

  1094.     png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)

  1095. {

  1096.    png_uint_32 retval = 0;

  1097.    if (png_ptr != NULL && info_ptr != NULL &&

  1098.        (info_ptr->valid & PNG_INFO_tRNS) != 0)

  1099.    {

  1100.       png_debug1(1, "in %s retrieval function", "tRNS");

  1101. 

  1102.       if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)

  1103.       {

  1104.          if (trans_alpha != NULL)

  1105.          {

  1106.             *trans_alpha = info_ptr->trans_alpha;

  1107.             retval |= PNG_INFO_tRNS;

  1108.          }

  1109. 

  1110.          if (trans_color != NULL)

  1111.             *trans_color = &(info_ptr->trans_color);

  1112.       }

  1113. 

  1114.       else /* if (info_ptr->color_type != PNG_COLOR_TYPE_PALETTE) */

  1115.       {

  1116.          if (trans_color != NULL)

  1117.          {

  1118.             *trans_color = &(info_ptr->trans_color);

  1119.             retval |= PNG_INFO_tRNS;

  1120.          }

  1121. 

  1122.          if (trans_alpha != NULL)

  1123.             *trans_alpha = NULL;

  1124.       }

  1125. 

  1126.       if (num_trans != NULL)

  1127.       {

  1128.          *num_trans = info_ptr->num_trans;

  1129.          retval |= PNG_INFO_tRNS;

  1130.       }

  1131.    }

  1132. 

  1133.    return (retval);

  1134. }

  1135. #endif

  1136. 

  1137. #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED

  1138. int PNGAPI

  1139. png_get_unknown_chunks(png_const_structrp png_ptr, png_inforp info_ptr,

  1140.     png_unknown_chunkpp unknowns)

  1141. {

  1142.    if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)

  1143.    {

  1144.       *unknowns = info_ptr->unknown_chunks;

  1145.       return info_ptr->unknown_chunks_num;

  1146.    }

  1147. 

  1148.    return (0);

  1149. }

  1150. #endif

  1151. 

  1152. #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED

  1153. png_byte PNGAPI

  1154. png_get_rgb_to_gray_status (png_const_structrp png_ptr)

  1155. {

  1156.    return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0);

  1157. }

  1158. #endif

  1159. 

  1160. #ifdef PNG_USER_CHUNKS_SUPPORTED

  1161. png_voidp PNGAPI

  1162. png_get_user_chunk_ptr(png_const_structrp png_ptr)

  1163. {

  1164.    return (png_ptr ? png_ptr->user_chunk_ptr : NULL);

  1165. }

  1166. #endif

  1167. 

  1168. size_t PNGAPI

  1169. png_get_compression_buffer_size(png_const_structrp png_ptr)

  1170. {

  1171.    if (png_ptr == NULL)

  1172.       return 0;

  1173. 

  1174. #ifdef PNG_WRITE_SUPPORTED

  1175.    if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)

  1176. #endif

  1177.    {

  1178. #ifdef PNG_SEQUENTIAL_READ_SUPPORTED

  1179.       return png_ptr->IDAT_read_size;

  1180. #else

  1181.       return PNG_IDAT_READ_SIZE;

  1182. #endif

  1183.    }

  1184. 

  1185. #ifdef PNG_WRITE_SUPPORTED

  1186.    else

  1187.       return png_ptr->zbuffer_size;

  1188. #endif

  1189. }

  1190. 

  1191. #ifdef PNG_SET_USER_LIMITS_SUPPORTED

  1192. /* These functions were added to libpng 1.2.6 and were enabled

  1193.  * by default in libpng-1.4.0 */

  1194. png_uint_32 PNGAPI

  1195. png_get_user_width_max (png_const_structrp png_ptr)

  1196. {

  1197.    return (png_ptr ? png_ptr->user_width_max : 0);

  1198. }

  1199. 

  1200. png_uint_32 PNGAPI

  1201. png_get_user_height_max (png_const_structrp png_ptr)

  1202. {

  1203.    return (png_ptr ? png_ptr->user_height_max : 0);

  1204. }

  1205. 

  1206. /* This function was added to libpng 1.4.0 */

  1207. png_uint_32 PNGAPI

  1208. png_get_chunk_cache_max (png_const_structrp png_ptr)

  1209. {

  1210.    return (png_ptr ? png_ptr->user_chunk_cache_max : 0);

  1211. }

  1212. 

  1213. /* This function was added to libpng 1.4.1 */

  1214. png_alloc_size_t PNGAPI

  1215. png_get_chunk_malloc_max (png_const_structrp png_ptr)

  1216. {

  1217.    return (png_ptr ? png_ptr->user_chunk_malloc_max : 0);

  1218. }

  1219. #endif /* SET_USER_LIMITS */

  1220. 

  1221. /* These functions were added to libpng 1.4.0 */

  1222. #ifdef PNG_IO_STATE_SUPPORTED

  1223. png_uint_32 PNGAPI

  1224. png_get_io_state (png_const_structrp png_ptr)

  1225. {

  1226.    return png_ptr->io_state;

  1227. }

  1228. 

  1229. png_uint_32 PNGAPI

  1230. png_get_io_chunk_type (png_const_structrp png_ptr)

  1231. {

  1232.    return png_ptr->chunk_name;

  1233. }

  1234. #endif /* IO_STATE */

  1235. 

  1236. #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED

  1237. #  ifdef PNG_GET_PALETTE_MAX_SUPPORTED

  1238. int PNGAPI

  1239. png_get_palette_max(png_const_structp png_ptr, png_const_infop info_ptr)

  1240. {

  1241.    if (png_ptr != NULL && info_ptr != NULL)

  1242.       return png_ptr->num_palette_max;

  1243. 

  1244.    return (-1);

  1245. }

  1246. #  endif

  1247. #endif

  1248. 

  1249. #endif /* READ || WRITE */