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The JUCE cross-platform C++ framework, with DISTRHO/KXStudio specific changes
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JUCE/modules/juce_graphics/image_formats/pnglib/pngtrans.c

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  1. 

  2. /* pngtrans.c - transforms the data in a row (used by both readers and writers)

  3.  *

  4.  * Last changed in libpng 1.2.17 May 15, 2007

  5.  * For conditions of distribution and use, see copyright notice in png.h

  6.  * Copyright (c) 1998-2007 Glenn Randers-Pehrson

  7.  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)

  8.  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)

  9.  */

  10. 

  11. #define PNG_INTERNAL

  12. #include "png.h"

  13. 

  14. #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)

  15. #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)

  16. /* turn on BGR-to-RGB mapping */

  17. void PNGAPI

  18. png_set_bgr(png_structp png_ptr)

  19. {

  20.    png_debug(1, "in png_set_bgr\n");

  21.    if(png_ptr == NULL) return;

  22.    png_ptr->transformations |= PNG_BGR;

  23. }

  24. #endif

  25. 

  26. #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)

  27. /* turn on 16 bit byte swapping */

  28. void PNGAPI

  29. png_set_swap(png_structp png_ptr)

  30. {

  31.    png_debug(1, "in png_set_swap\n");

  32.    if(png_ptr == NULL) return;

  33.    if (png_ptr->bit_depth == 16)

  34.       png_ptr->transformations |= PNG_SWAP_BYTES;

  35. }

  36. #endif

  37. 

  38. #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)

  39. /* turn on pixel packing */

  40. void PNGAPI

  41. png_set_packing(png_structp png_ptr)

  42. {

  43.    png_debug(1, "in png_set_packing\n");

  44.    if(png_ptr == NULL) return;

  45.    if (png_ptr->bit_depth < 8)

  46.    {

  47.       png_ptr->transformations |= PNG_PACK;

  48.       png_ptr->usr_bit_depth = 8;

  49.    }

  50. }

  51. #endif

  52. 

  53. #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)

  54. /* turn on packed pixel swapping */

  55. void PNGAPI

  56. png_set_packswap(png_structp png_ptr)

  57. {

  58.    png_debug(1, "in png_set_packswap\n");

  59.    if(png_ptr == NULL) return;

  60.    if (png_ptr->bit_depth < 8)

  61.       png_ptr->transformations |= PNG_PACKSWAP;

  62. }

  63. #endif

  64. 

  65. #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)

  66. void PNGAPI

  67. png_set_shift(png_structp png_ptr, png_color_8p true_bits)

  68. {

  69.    png_debug(1, "in png_set_shift\n");

  70.    if(png_ptr == NULL) return;

  71.    png_ptr->transformations |= PNG_SHIFT;

  72.    png_ptr->shift = *true_bits;

  73. }

  74. #endif

  75. 

  76. #if defined(PNG_READ_INTERLACING_SUPPORTED) || \

  77.     defined(PNG_WRITE_INTERLACING_SUPPORTED)

  78. int PNGAPI

  79. png_set_interlace_handling(png_structp png_ptr)

  80. {

  81.    png_debug(1, "in png_set_interlace handling\n");

  82.    if (png_ptr && png_ptr->interlaced)

  83.    {

  84.       png_ptr->transformations |= PNG_INTERLACE;

  85.       return (7);

  86.    }

  87. 

  88.    return (1);

  89. }

  90. #endif

  91. 

  92. #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)

  93. /* Add a filler byte on read, or remove a filler or alpha byte on write.

  94.  * The filler type has changed in v0.95 to allow future 2-byte fillers

  95.  * for 48-bit input data, as well as to avoid problems with some compilers

  96.  * that don't like bytes as parameters.

  97.  */

  98. void PNGAPI

  99. png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)

  100. {

  101.    png_debug(1, "in png_set_filler\n");

  102.    if(png_ptr == NULL) return;

  103.    png_ptr->transformations |= PNG_FILLER;

  104.    png_ptr->filler = (png_byte)filler;

  105.    if (filler_loc == PNG_FILLER_AFTER)

  106.       png_ptr->flags |= PNG_FLAG_FILLER_AFTER;

  107.    else

  108.       png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;

  109. 

  110.    /* This should probably go in the "do_read_filler" routine.

  111.     * I attempted to do that in libpng-1.0.1a but that caused problems

  112.     * so I restored it in libpng-1.0.2a

  113.    */

  114. 

  115.    if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)

  116.    {

  117.       png_ptr->usr_channels = 4;

  118.    }

  119. 

  120.    /* Also I added this in libpng-1.0.2a (what happens when we expand

  121.     * a less-than-8-bit grayscale to GA? */

  122. 

  123.    if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8)

  124.    {

  125.       png_ptr->usr_channels = 2;

  126.    }

  127. }

  128. 

  129. #if !defined(PNG_1_0_X)

  130. /* Added to libpng-1.2.7 */

  131. void PNGAPI

  132. png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc)

  133. {

  134.    png_debug(1, "in png_set_add_alpha\n");

  135.    if(png_ptr == NULL) return;

  136.    png_set_filler(png_ptr, filler, filler_loc);

  137.    png_ptr->transformations |= PNG_ADD_ALPHA;

  138. }

  139. #endif

  140. 

  141. #endif

  142. 

  143. #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \

  144.     defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)

  145. void PNGAPI

  146. png_set_swap_alpha(png_structp png_ptr)

  147. {

  148.    png_debug(1, "in png_set_swap_alpha\n");

  149.    if(png_ptr == NULL) return;

  150.    png_ptr->transformations |= PNG_SWAP_ALPHA;

  151. }

  152. #endif

  153. 

  154. #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \

  155.     defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)

  156. void PNGAPI

  157. png_set_invert_alpha(png_structp png_ptr)

  158. {

  159.    png_debug(1, "in png_set_invert_alpha\n");

  160.    if(png_ptr == NULL) return;

  161.    png_ptr->transformations |= PNG_INVERT_ALPHA;

  162. }

  163. #endif

  164. 

  165. #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)

  166. void PNGAPI

  167. png_set_invert_mono(png_structp png_ptr)

  168. {

  169.    png_debug(1, "in png_set_invert_mono\n");

  170.    if(png_ptr == NULL) return;

  171.    png_ptr->transformations |= PNG_INVERT_MONO;

  172. }

  173. 

  174. /* invert monochrome grayscale data */

  175. void /* PRIVATE */

  176. png_do_invert(png_row_infop row_info, png_bytep row)

  177. {

  178.    png_debug(1, "in png_do_invert\n");

  179.   /* This test removed from libpng version 1.0.13 and 1.2.0:

  180.    *   if (row_info->bit_depth == 1 &&

  181.    */

  182. #if defined(PNG_USELESS_TESTS_SUPPORTED)

  183.    if (row == NULL || row_info == NULL)

  184.      return;

  185. #endif

  186.    if (row_info->color_type == PNG_COLOR_TYPE_GRAY)

  187.    {

  188.       png_bytep rp = row;

  189.       png_uint_32 i;

  190.       png_uint_32 istop = row_info->rowbytes;

  191. 

  192.       for (i = 0; i < istop; i++)

  193.       {

  194.          *rp = (png_byte)(~(*rp));

  195.          rp++;

  196.       }

  197.    }

  198.    else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&

  199.       row_info->bit_depth == 8)

  200.    {

  201.       png_bytep rp = row;

  202.       png_uint_32 i;

  203.       png_uint_32 istop = row_info->rowbytes;

  204. 

  205.       for (i = 0; i < istop; i+=2)

  206.       {

  207.          *rp = (png_byte)(~(*rp));

  208.          rp+=2;

  209.       }

  210.    }

  211.    else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&

  212.       row_info->bit_depth == 16)

  213.    {

  214.       png_bytep rp = row;

  215.       png_uint_32 i;

  216.       png_uint_32 istop = row_info->rowbytes;

  217. 

  218.       for (i = 0; i < istop; i+=4)

  219.       {

  220.          *rp = (png_byte)(~(*rp));

  221.          *(rp+1) = (png_byte)(~(*(rp+1)));

  222.          rp+=4;

  223.       }

  224.    }

  225. }

  226. #endif

  227. 

  228. #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)

  229. /* swaps byte order on 16 bit depth images */

  230. void /* PRIVATE */

  231. png_do_swap(png_row_infop row_info, png_bytep row)

  232. {

  233.    png_debug(1, "in png_do_swap\n");

  234.    if (

  235. #if defined(PNG_USELESS_TESTS_SUPPORTED)

  236.        row != NULL && row_info != NULL &&

  237. #endif

  238.        row_info->bit_depth == 16)

  239.    {

  240.       png_bytep rp = row;

  241.       png_uint_32 i;

  242.       png_uint_32 istop= row_info->width * row_info->channels;

  243. 

  244.       for (i = 0; i < istop; i++, rp += 2)

  245.       {

  246.          png_byte t = *rp;

  247.          *rp = *(rp + 1);

  248.          *(rp + 1) = t;

  249.       }

  250.    }

  251. }

  252. #endif

  253. 

  254. #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)

  255. static PNG_CONST png_byte onebppswaptable[256] = {

  256.    0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0,

  257.    0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0,

  258.    0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8,

  259.    0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8,

  260.    0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4,

  261.    0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4,

  262.    0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC,

  263.    0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC,

  264.    0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2,

  265.    0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2,

  266.    0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA,

  267.    0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA,

  268.    0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6,

  269.    0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6,

  270.    0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE,

  271.    0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE,

  272.    0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1,

  273.    0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1,

  274.    0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9,

  275.    0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9,

  276.    0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5,

  277.    0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5,

  278.    0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED,

  279.    0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD,

  280.    0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3,

  281.    0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3,

  282.    0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB,

  283.    0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB,

  284.    0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7,

  285.    0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7,

  286.    0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF,

  287.    0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF

  288. };

  289. 

  290. static PNG_CONST png_byte twobppswaptable[256] = {

  291.    0x00, 0x40, 0x80, 0xC0, 0x10, 0x50, 0x90, 0xD0,

  292.    0x20, 0x60, 0xA0, 0xE0, 0x30, 0x70, 0xB0, 0xF0,

  293.    0x04, 0x44, 0x84, 0xC4, 0x14, 0x54, 0x94, 0xD4,

  294.    0x24, 0x64, 0xA4, 0xE4, 0x34, 0x74, 0xB4, 0xF4,

  295.    0x08, 0x48, 0x88, 0xC8, 0x18, 0x58, 0x98, 0xD8,

  296.    0x28, 0x68, 0xA8, 0xE8, 0x38, 0x78, 0xB8, 0xF8,

  297.    0x0C, 0x4C, 0x8C, 0xCC, 0x1C, 0x5C, 0x9C, 0xDC,

  298.    0x2C, 0x6C, 0xAC, 0xEC, 0x3C, 0x7C, 0xBC, 0xFC,

  299.    0x01, 0x41, 0x81, 0xC1, 0x11, 0x51, 0x91, 0xD1,

  300.    0x21, 0x61, 0xA1, 0xE1, 0x31, 0x71, 0xB1, 0xF1,

  301.    0x05, 0x45, 0x85, 0xC5, 0x15, 0x55, 0x95, 0xD5,

  302.    0x25, 0x65, 0xA5, 0xE5, 0x35, 0x75, 0xB5, 0xF5,

  303.    0x09, 0x49, 0x89, 0xC9, 0x19, 0x59, 0x99, 0xD9,

  304.    0x29, 0x69, 0xA9, 0xE9, 0x39, 0x79, 0xB9, 0xF9,

  305.    0x0D, 0x4D, 0x8D, 0xCD, 0x1D, 0x5D, 0x9D, 0xDD,

  306.    0x2D, 0x6D, 0xAD, 0xED, 0x3D, 0x7D, 0xBD, 0xFD,

  307.    0x02, 0x42, 0x82, 0xC2, 0x12, 0x52, 0x92, 0xD2,

  308.    0x22, 0x62, 0xA2, 0xE2, 0x32, 0x72, 0xB2, 0xF2,

  309.    0x06, 0x46, 0x86, 0xC6, 0x16, 0x56, 0x96, 0xD6,

  310.    0x26, 0x66, 0xA6, 0xE6, 0x36, 0x76, 0xB6, 0xF6,

  311.    0x0A, 0x4A, 0x8A, 0xCA, 0x1A, 0x5A, 0x9A, 0xDA,

  312.    0x2A, 0x6A, 0xAA, 0xEA, 0x3A, 0x7A, 0xBA, 0xFA,

  313.    0x0E, 0x4E, 0x8E, 0xCE, 0x1E, 0x5E, 0x9E, 0xDE,

  314.    0x2E, 0x6E, 0xAE, 0xEE, 0x3E, 0x7E, 0xBE, 0xFE,

  315.    0x03, 0x43, 0x83, 0xC3, 0x13, 0x53, 0x93, 0xD3,

  316.    0x23, 0x63, 0xA3, 0xE3, 0x33, 0x73, 0xB3, 0xF3,

  317.    0x07, 0x47, 0x87, 0xC7, 0x17, 0x57, 0x97, 0xD7,

  318.    0x27, 0x67, 0xA7, 0xE7, 0x37, 0x77, 0xB7, 0xF7,

  319.    0x0B, 0x4B, 0x8B, 0xCB, 0x1B, 0x5B, 0x9B, 0xDB,

  320.    0x2B, 0x6B, 0xAB, 0xEB, 0x3B, 0x7B, 0xBB, 0xFB,

  321.    0x0F, 0x4F, 0x8F, 0xCF, 0x1F, 0x5F, 0x9F, 0xDF,

  322.    0x2F, 0x6F, 0xAF, 0xEF, 0x3F, 0x7F, 0xBF, 0xFF

  323. };

  324. 

  325. static PNG_CONST png_byte fourbppswaptable[256] = {

  326.    0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70,

  327.    0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0,

  328.    0x01, 0x11, 0x21, 0x31, 0x41, 0x51, 0x61, 0x71,

  329.    0x81, 0x91, 0xA1, 0xB1, 0xC1, 0xD1, 0xE1, 0xF1,

  330.    0x02, 0x12, 0x22, 0x32, 0x42, 0x52, 0x62, 0x72,

  331.    0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2, 0xE2, 0xF2,

  332.    0x03, 0x13, 0x23, 0x33, 0x43, 0x53, 0x63, 0x73,

  333.    0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3, 0xF3,

  334.    0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74,

  335.    0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4, 0xF4,

  336.    0x05, 0x15, 0x25, 0x35, 0x45, 0x55, 0x65, 0x75,

  337.    0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5, 0xF5,

  338.    0x06, 0x16, 0x26, 0x36, 0x46, 0x56, 0x66, 0x76,

  339.    0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6, 0xF6,

  340.    0x07, 0x17, 0x27, 0x37, 0x47, 0x57, 0x67, 0x77,

  341.    0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7, 0xF7,

  342.    0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78,

  343.    0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8, 0xF8,

  344.    0x09, 0x19, 0x29, 0x39, 0x49, 0x59, 0x69, 0x79,

  345.    0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9, 0xF9,

  346.    0x0A, 0x1A, 0x2A, 0x3A, 0x4A, 0x5A, 0x6A, 0x7A,

  347.    0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA, 0xFA,

  348.    0x0B, 0x1B, 0x2B, 0x3B, 0x4B, 0x5B, 0x6B, 0x7B,

  349.    0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB, 0xFB,

  350.    0x0C, 0x1C, 0x2C, 0x3C, 0x4C, 0x5C, 0x6C, 0x7C,

  351.    0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC, 0xFC,

  352.    0x0D, 0x1D, 0x2D, 0x3D, 0x4D, 0x5D, 0x6D, 0x7D,

  353.    0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED, 0xFD,

  354.    0x0E, 0x1E, 0x2E, 0x3E, 0x4E, 0x5E, 0x6E, 0x7E,

  355.    0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE, 0xFE,

  356.    0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F,

  357.    0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF, 0xEF, 0xFF

  358. };

  359. 

  360. /* swaps pixel packing order within bytes */

  361. void /* PRIVATE */

  362. png_do_packswap(png_row_infop row_info, png_bytep row)

  363. {

  364.    png_debug(1, "in png_do_packswap\n");

  365.    if (

  366. #if defined(PNG_USELESS_TESTS_SUPPORTED)

  367.        row != NULL && row_info != NULL &&

  368. #endif

  369.        row_info->bit_depth < 8)

  370.    {

  371.       png_bytep rp, end, table;

  372. 

  373.       end = row + row_info->rowbytes;

  374. 

  375.       if (row_info->bit_depth == 1)

  376.          table = (png_bytep)onebppswaptable;

  377.       else if (row_info->bit_depth == 2)

  378.          table = (png_bytep)twobppswaptable;

  379.       else if (row_info->bit_depth == 4)

  380.          table = (png_bytep)fourbppswaptable;

  381.       else

  382.          return;

  383. 

  384.       for (rp = row; rp < end; rp++)

  385.          *rp = table[*rp];

  386.    }

  387. }

  388. #endif /* PNG_READ_PACKSWAP_SUPPORTED or PNG_WRITE_PACKSWAP_SUPPORTED */

  389. 

  390. #if defined(PNG_WRITE_FILLER_SUPPORTED) || \

  391.     defined(PNG_READ_STRIP_ALPHA_SUPPORTED)

  392. /* remove filler or alpha byte(s) */

  393. void /* PRIVATE */

  394. png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)

  395. {

  396.    png_debug(1, "in png_do_strip_filler\n");

  397. #if defined(PNG_USELESS_TESTS_SUPPORTED)

  398.    if (row != NULL && row_info != NULL)

  399. #endif

  400.    {

  401.       png_bytep sp=row;

  402.       png_bytep dp=row;

  403.       png_uint_32 row_width=row_info->width;

  404.       png_uint_32 i;

  405. 

  406.       if ((row_info->color_type == PNG_COLOR_TYPE_RGB ||

  407.          (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA &&

  408.          (flags & PNG_FLAG_STRIP_ALPHA))) &&

  409.          row_info->channels == 4)

  410.       {

  411.          if (row_info->bit_depth == 8)

  412.          {

  413.             /* This converts from RGBX or RGBA to RGB */

  414.             if (flags & PNG_FLAG_FILLER_AFTER)

  415.             {

  416.                dp+=3; sp+=4;

  417.                for (i = 1; i < row_width; i++)

  418.                {

  419.                   *dp++ = *sp++;

  420.                   *dp++ = *sp++;

  421.                   *dp++ = *sp++;

  422.                   sp++;

  423.                }

  424.             }

  425.             /* This converts from XRGB or ARGB to RGB */

  426.             else

  427.             {

  428.                for (i = 0; i < row_width; i++)

  429.                {

  430.                   sp++;

  431.                   *dp++ = *sp++;

  432.                   *dp++ = *sp++;

  433.                   *dp++ = *sp++;

  434.                }

  435.             }

  436.             row_info->pixel_depth = 24;

  437.             row_info->rowbytes = row_width * 3;

  438.          }

  439.          else /* if (row_info->bit_depth == 16) */

  440.          {

  441.             if (flags & PNG_FLAG_FILLER_AFTER)

  442.             {

  443.                /* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */

  444.                sp += 8; dp += 6;

  445.                for (i = 1; i < row_width; i++)

  446.                {

  447.                   /* This could be (although png_memcpy is probably slower):

  448.                   png_memcpy(dp, sp, 6);

  449.                   sp += 8;

  450.                   dp += 6;

  451.                   */

  452. 

  453.                   *dp++ = *sp++;

  454.                   *dp++ = *sp++;

  455.                   *dp++ = *sp++;

  456.                   *dp++ = *sp++;

  457.                   *dp++ = *sp++;

  458.                   *dp++ = *sp++;

  459.                   sp += 2;

  460.                }

  461.             }

  462.             else

  463.             {

  464.                /* This converts from XXRRGGBB or AARRGGBB to RRGGBB */

  465.                for (i = 0; i < row_width; i++)

  466.                {

  467.                   /* This could be (although png_memcpy is probably slower):

  468.                   png_memcpy(dp, sp, 6);

  469.                   sp += 8;

  470.                   dp += 6;

  471.                   */

  472. 

  473.                   sp+=2;

  474.                   *dp++ = *sp++;

  475.                   *dp++ = *sp++;

  476.                   *dp++ = *sp++;

  477.                   *dp++ = *sp++;

  478.                   *dp++ = *sp++;

  479.                   *dp++ = *sp++;

  480.                }

  481.             }

  482.             row_info->pixel_depth = 48;

  483.             row_info->rowbytes = row_width * 6;

  484.          }

  485.          row_info->channels = 3;

  486.       }

  487.       else if ((row_info->color_type == PNG_COLOR_TYPE_GRAY ||

  488.          (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&

  489.          (flags & PNG_FLAG_STRIP_ALPHA))) &&

  490.           row_info->channels == 2)

  491.       {

  492.          if (row_info->bit_depth == 8)

  493.          {

  494.             /* This converts from GX or GA to G */

  495.             if (flags & PNG_FLAG_FILLER_AFTER)

  496.             {

  497.                for (i = 0; i < row_width; i++)

  498.                {

  499.                   *dp++ = *sp++;

  500.                   sp++;

  501.                }

  502.             }

  503.             /* This converts from XG or AG to G */

  504.             else

  505.             {

  506.                for (i = 0; i < row_width; i++)

  507.                {

  508.                   sp++;

  509.                   *dp++ = *sp++;

  510.                }

  511.             }

  512.             row_info->pixel_depth = 8;

  513.             row_info->rowbytes = row_width;

  514.          }

  515.          else /* if (row_info->bit_depth == 16) */

  516.          {

  517.             if (flags & PNG_FLAG_FILLER_AFTER)

  518.             {

  519.                /* This converts from GGXX or GGAA to GG */

  520.                sp += 4; dp += 2;

  521.                for (i = 1; i < row_width; i++)

  522.                {

  523.                   *dp++ = *sp++;

  524.                   *dp++ = *sp++;

  525.                   sp += 2;

  526.                }

  527.             }

  528.             else

  529.             {

  530.                /* This converts from XXGG or AAGG to GG */

  531.                for (i = 0; i < row_width; i++)

  532.                {

  533.                   sp += 2;

  534.                   *dp++ = *sp++;

  535.                   *dp++ = *sp++;

  536.                }

  537.             }

  538.             row_info->pixel_depth = 16;

  539.             row_info->rowbytes = row_width * 2;

  540.          }

  541.          row_info->channels = 1;

  542.       }

  543.       if (flags & PNG_FLAG_STRIP_ALPHA)

  544.         row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;

  545.    }

  546. }

  547. #endif

  548. 

  549. #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)

  550. /* swaps red and blue bytes within a pixel */

  551. void /* PRIVATE */

  552. png_do_bgr(png_row_infop row_info, png_bytep row)

  553. {

  554.    png_debug(1, "in png_do_bgr\n");

  555.    if (

  556. #if defined(PNG_USELESS_TESTS_SUPPORTED)

  557.        row != NULL && row_info != NULL &&

  558. #endif

  559.        (row_info->color_type & PNG_COLOR_MASK_COLOR))

  560.    {

  561.       png_uint_32 row_width = row_info->width;

  562.       if (row_info->bit_depth == 8)

  563.       {

  564.          if (row_info->color_type == PNG_COLOR_TYPE_RGB)

  565.          {

  566.             png_bytep rp;

  567.             png_uint_32 i;

  568. 

  569.             for (i = 0, rp = row; i < row_width; i++, rp += 3)

  570.             {

  571.                png_byte save = *rp;

  572.                *rp = *(rp + 2);

  573.                *(rp + 2) = save;

  574.             }

  575.          }

  576.          else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)

  577.          {

  578.             png_bytep rp;

  579.             png_uint_32 i;

  580. 

  581.             for (i = 0, rp = row; i < row_width; i++, rp += 4)

  582.             {

  583.                png_byte save = *rp;

  584.                *rp = *(rp + 2);

  585.                *(rp + 2) = save;

  586.             }

  587.          }

  588.       }

  589.       else if (row_info->bit_depth == 16)

  590.       {

  591.          if (row_info->color_type == PNG_COLOR_TYPE_RGB)

  592.          {

  593.             png_bytep rp;

  594.             png_uint_32 i;

  595. 

  596.             for (i = 0, rp = row; i < row_width; i++, rp += 6)

  597.             {

  598.                png_byte save = *rp;

  599.                *rp = *(rp + 4);

  600.                *(rp + 4) = save;

  601.                save = *(rp + 1);

  602.                *(rp + 1) = *(rp + 5);

  603.                *(rp + 5) = save;

  604.             }

  605.          }

  606.          else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)

  607.          {

  608.             png_bytep rp;

  609.             png_uint_32 i;

  610. 

  611.             for (i = 0, rp = row; i < row_width; i++, rp += 8)

  612.             {

  613.                png_byte save = *rp;

  614.                *rp = *(rp + 4);

  615.                *(rp + 4) = save;

  616.                save = *(rp + 1);

  617.                *(rp + 1) = *(rp + 5);

  618.                *(rp + 5) = save;

  619.             }

  620.          }

  621.       }

  622.    }

  623. }

  624. #endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */

  625. 

  626. #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \

  627.     defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \

  628.     defined(PNG_LEGACY_SUPPORTED)

  629. void PNGAPI

  630. png_set_user_transform_info(png_structp png_ptr, png_voidp

  631.    user_transform_ptr, int user_transform_depth, int user_transform_channels)

  632. {

  633.    png_debug(1, "in png_set_user_transform_info\n");

  634.    if(png_ptr == NULL) return;

  635. #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)

  636.    png_ptr->user_transform_ptr = user_transform_ptr;

  637.    png_ptr->user_transform_depth = (png_byte)user_transform_depth;

  638.    png_ptr->user_transform_channels = (png_byte)user_transform_channels;

  639. #else

  640.    if(user_transform_ptr || user_transform_depth || user_transform_channels)

  641.       png_warning(png_ptr,

  642.         "This version of libpng does not support user transform info");

  643. #endif

  644. }

  645. #endif

  646. 

  647. /* This function returns a pointer to the user_transform_ptr associated with

  648.  * the user transform functions.  The application should free any memory

  649.  * associated with this pointer before png_write_destroy and png_read_destroy

  650.  * are called.

  651.  */

  652. png_voidp PNGAPI

  653. png_get_user_transform_ptr(png_structp png_ptr)

  654. {

  655. #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)

  656.    if (png_ptr == NULL) return (NULL);

  657.    return ((png_voidp)png_ptr->user_transform_ptr);

  658. #else

  659.    return (NULL);

  660. #endif

  661. }

  662. #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */