/src/FreeImage/Source/LibPNG/png.h

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  1. /* png.h - header file for PNG reference library
    2. 

  2.  *
    3. 

  3.  * libpng version 1.5.9 - February 18, 2012
    4. 

  4.  * Copyright (c) 1998-2012 Glenn Randers-Pehrson
    5. 

  5.  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
    6. 

  6.  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
    7. 

  7.  *
    8. 

  8.  * This code is released under the libpng license (See LICENSE, below)
    9. 

  9.  *
    10. 

  10.  * Authors and maintainers:
    11. 

  11.  *   libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
    12. 

  12.  *   libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
    13. 

  13.  *   libpng versions 0.97, January 1998, through 1.5.9 - February 18, 2012: Glenn
    14. 

  14.  *   See also "Contributing Authors", below.
    15. 

  15.  *
    16. 

  16.  * Note about libpng version numbers:
    17. 

  17.  *
    18. 

  18.  *   Due to various miscommunications, unforeseen code incompatibilities
    19. 

  19.  *   and occasional factors outside the authors' control, version numbering
    20. 

  20.  *   on the library has not always been consistent and straightforward.
    21. 

  21.  *   The following table summarizes matters since version 0.89c, which was
    22. 

  22.  *   the first widely used release:
    23. 

  23.  *
    24. 

  24.  *    source                 png.h  png.h  shared-lib
    25. 

  25.  *    version                string   int  version
    26. 

  26.  *    -------                ------ -----  ----------
    27. 

  27.  *    0.89c "1.0 beta 3"     0.89      89  1.0.89
    28. 

  28.  *    0.90  "1.0 beta 4"     0.90      90  0.90  [should have been 2.0.90]
    29. 

  29.  *    0.95  "1.0 beta 5"     0.95      95  0.95  [should have been 2.0.95]
    30. 

  30.  *    0.96  "1.0 beta 6"     0.96      96  0.96  [should have been 2.0.96]
    31. 

  31.  *    0.97b "1.00.97 beta 7" 1.00.97   97  1.0.1 [should have been 2.0.97]
    32. 

  32.  *    0.97c                  0.97      97  2.0.97
    33. 

  33.  *    0.98                   0.98      98  2.0.98
    34. 

  34.  *    0.99                   0.99      98  2.0.99
    35. 

  35.  *    0.99a-m                0.99      99  2.0.99
    36. 

  36.  *    1.00                   1.00     100  2.1.0 [100 should be 10000]
    37. 

  37.  *    1.0.0      (from here on, the   100  2.1.0 [100 should be 10000]
    38. 

  38.  *    1.0.1       png.h string is   10001  2.1.0
    39. 

  39.  *    1.0.1a-e    identical to the  10002  from here on, the shared library
    40. 

  40.  *    1.0.2       source version)   10002  is 2.V where V is the source code
    41. 

  41.  *    1.0.2a-b                      10003  version, except as noted.
    42. 

  42.  *    1.0.3                         10003
    43. 

  43.  *    1.0.3a-d                      10004
    44. 

  44.  *    1.0.4                         10004
    45. 

  45.  *    1.0.4a-f                      10005
    46. 

  46.  *    1.0.5 (+ 2 patches)           10005
    47. 

  47.  *    1.0.5a-d                      10006
    48. 

  48.  *    1.0.5e-r                      10100 (not source compatible)
    49. 

  49.  *    1.0.5s-v                      10006 (not binary compatible)
    50. 

  50.  *    1.0.6 (+ 3 patches)           10006 (still binary incompatible)
    51. 

  51.  *    1.0.6d-f                      10007 (still binary incompatible)
    52. 

  52.  *    1.0.6g                        10007
    53. 

  53.  *    1.0.6h                        10007  10.6h (testing xy.z so-numbering)
    54. 

  54.  *    1.0.6i                        10007  10.6i
    55. 

  55.  *    1.0.6j                        10007  2.1.0.6j (incompatible with 1.0.0)
    56. 

  56.  *    1.0.7beta11-14        DLLNUM  10007  2.1.0.7beta11-14 (binary compatible)
    57. 

  57.  *    1.0.7beta15-18           1    10007  2.1.0.7beta15-18 (binary compatible)
    58. 

  58.  *    1.0.7rc1-2               1    10007  2.1.0.7rc1-2 (binary compatible)
    59. 

  59.  *    1.0.7                    1    10007  (still compatible)
    60. 

  60.  *    1.0.8beta1-4             1    10008  2.1.0.8beta1-4
    61. 

  61.  *    1.0.8rc1                 1    10008  2.1.0.8rc1
    62. 

  62.  *    1.0.8                    1    10008  2.1.0.8
    63. 

  63.  *    1.0.9beta1-6             1    10009  2.1.0.9beta1-6
    64. 

  64.  *    1.0.9rc1                 1    10009  2.1.0.9rc1
    65. 

  65.  *    1.0.9beta7-10            1    10009  2.1.0.9beta7-10
    66. 

  66.  *    1.0.9rc2                 1    10009  2.1.0.9rc2
    67. 

  67.  *    1.0.9                    1    10009  2.1.0.9
    68. 

  68.  *    1.0.10beta1              1    10010  2.1.0.10beta1
    69. 

  69.  *    1.0.10rc1                1    10010  2.1.0.10rc1
    70. 

  70.  *    1.0.10                   1    10010  2.1.0.10
    71. 

  71.  *    1.0.11beta1-3            1    10011  2.1.0.11beta1-3
    72. 

  72.  *    1.0.11rc1                1    10011  2.1.0.11rc1
    73. 

  73.  *    1.0.11                   1    10011  2.1.0.11
    74. 

  74.  *    1.0.12beta1-2            2    10012  2.1.0.12beta1-2
    75. 

  75.  *    1.0.12rc1                2    10012  2.1.0.12rc1
    76. 

  76.  *    1.0.12                   2    10012  2.1.0.12
    77. 

  77.  *    1.1.0a-f                 -    10100  2.1.1.0a-f (branch abandoned)
    78. 

  78.  *    1.2.0beta1-2             2    10200  2.1.2.0beta1-2
    79. 

  79.  *    1.2.0beta3-5             3    10200  3.1.2.0beta3-5
    80. 

  80.  *    1.2.0rc1                 3    10200  3.1.2.0rc1
    81. 

  81.  *    1.2.0                    3    10200  3.1.2.0
    82. 

  82.  *    1.2.1beta1-4             3    10201  3.1.2.1beta1-4
    83. 

  83.  *    1.2.1rc1-2               3    10201  3.1.2.1rc1-2
    84. 

  84.  *    1.2.1                    3    10201  3.1.2.1
    85. 

  85.  *    1.2.2beta1-6            12    10202  12.so.0.1.2.2beta1-6
    86. 

  86.  *    1.0.13beta1             10    10013  10.so.0.1.0.13beta1
    87. 

  87.  *    1.0.13rc1               10    10013  10.so.0.1.0.13rc1
    88. 

  88.  *    1.2.2rc1                12    10202  12.so.0.1.2.2rc1
    89. 

  89.  *    1.0.13                  10    10013  10.so.0.1.0.13
    90. 

  90.  *    1.2.2                   12    10202  12.so.0.1.2.2
    91. 

  91.  *    1.2.3rc1-6              12    10203  12.so.0.1.2.3rc1-6
    92. 

  92.  *    1.2.3                   12    10203  12.so.0.1.2.3
    93. 

  93.  *    1.2.4beta1-3            13    10204  12.so.0.1.2.4beta1-3
    94. 

  94.  *    1.0.14rc1               13    10014  10.so.0.1.0.14rc1
    95. 

  95.  *    1.2.4rc1                13    10204  12.so.0.1.2.4rc1
    96. 

  96.  *    1.0.14                  10    10014  10.so.0.1.0.14
    97. 

  97.  *    1.2.4                   13    10204  12.so.0.1.2.4
    98. 

  98.  *    1.2.5beta1-2            13    10205  12.so.0.1.2.5beta1-2
    99. 

  99.  *    1.0.15rc1-3             10    10015  10.so.0.1.0.15rc1-3
    100. 

  100.  *    1.2.5rc1-3              13    10205  12.so.0.1.2.5rc1-3
    101. 

  101.  *    1.0.15                  10    10015  10.so.0.1.0.15
    102. 

  102.  *    1.2.5                   13    10205  12.so.0.1.2.5
    103. 

  103.  *    1.2.6beta1-4            13    10206  12.so.0.1.2.6beta1-4
    104. 

  104.  *    1.0.16                  10    10016  10.so.0.1.0.16
    105. 

  105.  *    1.2.6                   13    10206  12.so.0.1.2.6
    106. 

  106.  *    1.2.7beta1-2            13    10207  12.so.0.1.2.7beta1-2
    107. 

  107.  *    1.0.17rc1               10    10017  12.so.0.1.0.17rc1
    108. 

  108.  *    1.2.7rc1                13    10207  12.so.0.1.2.7rc1
    109. 

  109.  *    1.0.17                  10    10017  12.so.0.1.0.17
    110. 

  110.  *    1.2.7                   13    10207  12.so.0.1.2.7
    111. 

  111.  *    1.2.8beta1-5            13    10208  12.so.0.1.2.8beta1-5
    112. 

  112.  *    1.0.18rc1-5             10    10018  12.so.0.1.0.18rc1-5
    113. 

  113.  *    1.2.8rc1-5              13    10208  12.so.0.1.2.8rc1-5
    114. 

  114.  *    1.0.18                  10    10018  12.so.0.1.0.18
    115. 

  115.  *    1.2.8                   13    10208  12.so.0.1.2.8
    116. 

  116.  *    1.2.9beta1-3            13    10209  12.so.0.1.2.9beta1-3
    117. 

  117.  *    1.2.9beta4-11           13    10209  12.so.0.9[.0]
    118. 

  118.  *    1.2.9rc1                13    10209  12.so.0.9[.0]
    119. 

  119.  *    1.2.9                   13    10209  12.so.0.9[.0]
    120. 

  120.  *    1.2.10beta1-7           13    10210  12.so.0.10[.0]
    121. 

  121.  *    1.2.10rc1-2             13    10210  12.so.0.10[.0]
    122. 

  122.  *    1.2.10                  13    10210  12.so.0.10[.0]
    123. 

  123.  *    1.4.0beta1-5            14    10400  14.so.0.0[.0]
    124. 

  124.  *    1.2.11beta1-4           13    10211  12.so.0.11[.0]
    125. 

  125.  *    1.4.0beta7-8            14    10400  14.so.0.0[.0]
    126. 

  126.  *    1.2.11                  13    10211  12.so.0.11[.0]
    127. 

  127.  *    1.2.12                  13    10212  12.so.0.12[.0]
    128. 

  128.  *    1.4.0beta9-14           14    10400  14.so.0.0[.0]
    129. 

  129.  *    1.2.13                  13    10213  12.so.0.13[.0]
    130. 

  130.  *    1.4.0beta15-36          14    10400  14.so.0.0[.0]
    131. 

  131.  *    1.4.0beta37-87          14    10400  14.so.14.0[.0]
    132. 

  132.  *    1.4.0rc01               14    10400  14.so.14.0[.0]
    133. 

  133.  *    1.4.0beta88-109         14    10400  14.so.14.0[.0]
    134. 

  134.  *    1.4.0rc02-08            14    10400  14.so.14.0[.0]
    135. 

  135.  *    1.4.0                   14    10400  14.so.14.0[.0]
    136. 

  136.  *    1.4.1beta01-03          14    10401  14.so.14.1[.0]
    137. 

  137.  *    1.4.1rc01               14    10401  14.so.14.1[.0]
    138. 

  138.  *    1.4.1beta04-12          14    10401  14.so.14.1[.0]
    139. 

  139.  *    1.4.1                   14    10401  14.so.14.1[.0]
    140. 

  140.  *    1.4.2                   14    10402  14.so.14.2[.0]
    141. 

  141.  *    1.4.3                   14    10403  14.so.14.3[.0]
    142. 

  142.  *    1.4.4                   14    10404  14.so.14.4[.0]
    143. 

  143.  *    1.5.0beta01-58          15    10500  15.so.15.0[.0]
    144. 

  144.  *    1.5.0rc01-07            15    10500  15.so.15.0[.0]
    145. 

  145.  *    1.5.0                   15    10500  15.so.15.0[.0]
    146. 

  146.  *    1.5.1beta01-11          15    10501  15.so.15.1[.0]
    147. 

  147.  *    1.5.1rc01-02            15    10501  15.so.15.1[.0]
    148. 

  148.  *    1.5.1                   15    10501  15.so.15.1[.0]
    149. 

  149.  *    1.5.2beta01-03          15    10502  15.so.15.2[.0]
    150. 

  150.  *    1.5.2rc01-03            15    10502  15.so.15.2[.0]
    151. 

  151.  *    1.5.2                   15    10502  15.so.15.2[.0]
    152. 

  152.  *    1.5.3beta01-10          15    10503  15.so.15.3[.0]
    153. 

  153.  *    1.5.3rc01-02            15    10503  15.so.15.3[.0]
    154. 

  154.  *    1.5.3beta11             15    10503  15.so.15.3[.0]
    155. 

  155.  *    1.5.3 [omitted]
    156. 

  156.  *    1.5.4beta01-08          15    10504  15.so.15.4[.0]
    157. 

  157.  *    1.5.4rc01               15    10504  15.so.15.4[.0]
    158. 

  158.  *    1.5.4                   15    10504  15.so.15.4[.0]
    159. 

  159.  *    1.5.5beta01-08          15    10505  15.so.15.5[.0]
    160. 

  160.  *    1.5.5rc01               15    10505  15.so.15.5[.0]
    161. 

  161.  *    1.5.5                   15    10505  15.so.15.5[.0]
    162. 

  162.  *    1.5.6beta01-07          15    10506  15.so.15.6[.0]
    163. 

  163.  *    1.5.6rc01-03            15    10506  15.so.15.6[.0]
    164. 

  164.  *    1.5.6                   15    10506  15.so.15.6[.0]
    165. 

  165.  *    1.5.7beta01-05          15    10507  15.so.15.7[.0]
    166. 

  166.  *    1.5.7rc01-03            15    10507  15.so.15.7[.0]
    167. 

  167.  *    1.5.7                   15    10507  15.so.15.7[.0]
    168. 

  168.  *    1.5.8beta01             15    10508  15.so.15.8[.0]
    169. 

  169.  *    1.5.8rc01               15    10508  15.so.15.8[.0]
    170. 

  170.  *    1.5.8                   15    10508  15.so.15.8[.0]
    171. 

  171.  *    1.5.9beta01-02          15    10509  15.so.15.9[.0]
    172. 

  172.  *    1.5.9rc01               15    10509  15.so.15.9[.0]
    173. 

  173.  *    1.5.9                   15    10509  15.so.15.9[.0]
    174. 

  174.  *
    175. 

  175.  *   Henceforth the source version will match the shared-library major
    176. 

  176.  *   and minor numbers; the shared-library major version number will be
    177. 

  177.  *   used for changes in backward compatibility, as it is intended.  The
    178. 

  178.  *   PNG_LIBPNG_VER macro, which is not used within libpng but is available
    179. 

  179.  *   for applications, is an unsigned integer of the form xyyzz corresponding
    180. 

  180.  *   to the source version x.y.z (leading zeros in y and z).  Beta versions
    181. 

  181.  *   were given the previous public release number plus a letter, until
    182. 

  182.  *   version 1.0.6j; from then on they were given the upcoming public
    183. 

  183.  *   release number plus "betaNN" or "rcN".
    184. 

  184.  *
    185. 

  185.  *   Binary incompatibility exists only when applications make direct access
    186. 

  186.  *   to the info_ptr or png_ptr members through png.h, and the compiled
    187. 

  187.  *   application is loaded with a different version of the library.
    188. 

  188.  *
    189. 

  189.  *   DLLNUM will change each time there are forward or backward changes
    190. 

  190.  *   in binary compatibility (e.g., when a new feature is added).
    191. 

  191.  *
    192. 

  192.  * See libpng-manual.txt or libpng.3 for more information.  The PNG
    193. 

  193.  * specification is available as a W3C Recommendation and as an ISO
    194. 

  194.  * Specification, <http://www.w3.org/TR/2003/REC-PNG-20031110/
    195. 

  195.  */
    196. 

  196. 

  197. /*
    198. 

  198.  * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
    199. 

  199.  *
    200. 

  200.  * If you modify libpng you may insert additional notices immediately following
    201. 

  201.  * this sentence.
    202. 

  202.  *
    203. 

  203.  * This code is released under the libpng license.
    204. 

  204.  *
    205. 

  205.  * libpng versions 1.2.6, August 15, 2004, through 1.5.9, February 18, 2012, are
    206. 

  206.  * Copyright (c) 2004, 2006-2012 Glenn Randers-Pehrson, and are
    207. 

  207.  * distributed according to the same disclaimer and license as libpng-1.2.5
    208. 

  208.  * with the following individual added to the list of Contributing Authors:
    209. 

  209.  *
    210. 

  210.  *    Cosmin Truta
    211. 

  211.  *
    212. 

  212.  * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
    213. 

  213.  * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
    214. 

  214.  * distributed according to the same disclaimer and license as libpng-1.0.6
    215. 

  215.  * with the following individuals added to the list of Contributing Authors:
    216. 

  216.  *
    217. 

  217.  *    Simon-Pierre Cadieux
    218. 

  218.  *    Eric S. Raymond
    219. 

  219.  *    Gilles Vollant
    220. 

  220.  *
    221. 

  221.  * and with the following additions to the disclaimer:
    222. 

  222.  *
    223. 

  223.  *    There is no warranty against interference with your enjoyment of the
    224. 

  224.  *    library or against infringement.  There is no warranty that our
    225. 

  225.  *    efforts or the library will fulfill any of your particular purposes
    226. 

  226.  *    or needs.  This library is provided with all faults, and the entire
    227. 

  227.  *    risk of satisfactory quality, performance, accuracy, and effort is with
    228. 

  228.  *    the user.
    229. 

  229.  *
    230. 

  230.  * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
    231. 

  231.  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
    232. 

  232.  * distributed according to the same disclaimer and license as libpng-0.96,
    233. 

  233.  * with the following individuals added to the list of Contributing Authors:
    234. 

  234.  *
    235. 

  235.  *    Tom Lane
    236. 

  236.  *    Glenn Randers-Pehrson
    237. 

  237.  *    Willem van Schaik
    238. 

  238.  *
    239. 

  239.  * libpng versions 0.89, June 1996, through 0.96, May 1997, are
    240. 

  240.  * Copyright (c) 1996, 1997 Andreas Dilger
    241. 

  241.  * Distributed according to the same disclaimer and license as libpng-0.88,
    242. 

  242.  * with the following individuals added to the list of Contributing Authors:
    243. 

  243.  *
    244. 

  244.  *    John Bowler
    245. 

  245.  *    Kevin Bracey
    246. 

  246.  *    Sam Bushell
    247. 

  247.  *    Magnus Holmgren
    248. 

  248.  *    Greg Roelofs
    249. 

  249.  *    Tom Tanner
    250. 

  250.  *
    251. 

  251.  * libpng versions 0.5, May 1995, through 0.88, January 1996, are
    252. 

  252.  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
    253. 

  253.  *
    254. 

  254.  * For the purposes of this copyright and license, "Contributing Authors"
    255. 

  255.  * is defined as the following set of individuals:
    256. 

  256.  *
    257. 

  257.  *    Andreas Dilger
    258. 

  258.  *    Dave Martindale
    259. 

  259.  *    Guy Eric Schalnat
    260. 

  260.  *    Paul Schmidt
    261. 

  261.  *    Tim Wegner
    262. 

  262.  *
    263. 

  263.  * The PNG Reference Library is supplied "AS IS".  The Contributing Authors
    264. 

  264.  * and Group 42, Inc. disclaim all warranties, expressed or implied,
    265. 

  265.  * including, without limitation, the warranties of merchantability and of
    266. 

  266.  * fitness for any purpose.  The Contributing Authors and Group 42, Inc.
    267. 

  267.  * assume no liability for direct, indirect, incidental, special, exemplary,
    268. 

  268.  * or consequential damages, which may result from the use of the PNG
    269. 

  269.  * Reference Library, even if advised of the possibility of such damage.
    270. 

  270.  *
    271. 

  271.  * Permission is hereby granted to use, copy, modify, and distribute this
    272. 

  272.  * source code, or portions hereof, for any purpose, without fee, subject
    273. 

  273.  * to the following restrictions:
    274. 

  274.  *
    275. 

  275.  *   1. The origin of this source code must not be misrepresented.
    276. 

  276.  *
    277. 

  277.  *   2. Altered versions must be plainly marked as such and must not
    278. 

  278.  *      be misrepresented as being the original source.
    279. 

  279.  *
    280. 

  280.  *   3. This Copyright notice may not be removed or altered from
    281. 

  281.  *      any source or altered source distribution.
    282. 

  282.  *
    283. 

  283.  * The Contributing Authors and Group 42, Inc. specifically permit, without
    284. 

  284.  * fee, and encourage the use of this source code as a component to
    285. 

  285.  * supporting the PNG file format in commercial products.  If you use this
    286. 

  286.  * source code in a product, acknowledgment is not required but would be
    287. 

  287.  * appreciated.
    288. 

  288.  */
    289. 

  289. 

  290. /*
    291. 

  291.  * A "png_get_copyright" function is available, for convenient use in "about"
    292. 

  292.  * boxes and the like:
    293. 

  293.  *
    294. 

  294.  *     printf("%s", png_get_copyright(NULL));
    295. 

  295.  *
    296. 

  296.  * Also, the PNG logo (in PNG format, of course) is supplied in the
    297. 

  297.  * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
    298. 

  298.  */
    299. 

  299. 

  300. /*
    301. 

  301.  * Libpng is OSI Certified Open Source Software.  OSI Certified is a
    302. 

  302.  * certification mark of the Open Source Initiative.
    303. 

  303.  */
    304. 

  304. 

  305. /*
    306. 

  306.  * The contributing authors would like to thank all those who helped
    307. 

  307.  * with testing, bug fixes, and patience.  This wouldn't have been
    308. 

  308.  * possible without all of you.
    309. 

  309.  *
    310. 

  310.  * Thanks to Frank J. T. Wojcik for helping with the documentation.
    311. 

  311.  */
    312. 

  312. 

  313. /*
    314. 

  314.  * Y2K compliance in libpng:
    315. 

  315.  * =========================
    316. 

  316.  *
    317. 

  317.  *    February 18, 2012
    318. 

  318.  *
    319. 

  319.  *    Since the PNG Development group is an ad-hoc body, we can't make
    320. 

  320.  *    an official declaration.
    321. 

  321.  *
    322. 

  322.  *    This is your unofficial assurance that libpng from version 0.71 and
    323. 

  323.  *    upward through 1.5.9 are Y2K compliant.  It is my belief that
    324. 

  324.  *    earlier versions were also Y2K compliant.
    325. 

  325.  *
    326. 

  326.  *    Libpng only has two year fields.  One is a 2-byte unsigned integer
    327. 

  327.  *    that will hold years up to 65535.  The other holds the date in text
    328. 

  328.  *    format, and will hold years up to 9999.
    329. 

  329.  *
    330. 

  330.  *    The integer is
    331. 

  331.  *        "png_uint_16 year" in png_time_struct.
    332. 

  332.  *
    333. 

  333.  *    The string is
    334. 

  334.  *        "png_char time_buffer" in png_struct
    335. 

  335.  *
    336. 

  336.  *    There are seven time-related functions:
    337. 

  337.  *        png.c: png_convert_to_rfc_1123() in png.c
    338. 

  338.  *          (formerly png_convert_to_rfc_1152() in error)
    339. 

  339.  *        png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
    340. 

  340.  *        png_convert_from_time_t() in pngwrite.c
    341. 

  341.  *        png_get_tIME() in pngget.c
    342. 

  342.  *        png_handle_tIME() in pngrutil.c, called in pngread.c
    343. 

  343.  *        png_set_tIME() in pngset.c
    344. 

  344.  *        png_write_tIME() in pngwutil.c, called in pngwrite.c
    345. 

  345.  *
    346. 

  346.  *    All handle dates properly in a Y2K environment.  The
    347. 

  347.  *    png_convert_from_time_t() function calls gmtime() to convert from system
    348. 

  348.  *    clock time, which returns (year - 1900), which we properly convert to
    349. 

  349.  *    the full 4-digit year.  There is a possibility that applications using
    350. 

  350.  *    libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
    351. 

  351.  *    function, or that they are incorrectly passing only a 2-digit year
    352. 

  352.  *    instead of "year - 1900" into the png_convert_from_struct_tm() function,
    353. 

  353.  *    but this is not under our control.  The libpng documentation has always
    354. 

  354.  *    stated that it works with 4-digit years, and the APIs have been
    355. 

  355.  *    documented as such.
    356. 

  356.  *
    357. 

  357.  *    The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
    358. 

  358.  *    integer to hold the year, and can hold years as large as 65535.
    359. 

  359.  *
    360. 

  360.  *    zlib, upon which libpng depends, is also Y2K compliant.  It contains
    361. 

  361.  *    no date-related code.
    362. 

  362.  *
    363. 

  363.  *       Glenn Randers-Pehrson
    364. 

  364.  *       libpng maintainer
    365. 

  365.  *       PNG Development Group
    366. 

  366.  */
    367. 

  367. 

  368. #ifndef PNG_H
    369. 

  369. #define PNG_H
    370. 

  370. 

  371. /* This is not the place to learn how to use libpng. The file libpng-manual.txt
    372. 

  372.  * describes how to use libpng, and the file example.c summarizes it
    373. 

  373.  * with some code on which to build.  This file is useful for looking
    374. 

  374.  * at the actual function definitions and structure components.
    375. 

  375.  *
    376. 

  376.  * If you just need to read a PNG file and don't want to read the documentation
    377. 

  377.  * skip to the end of this file and read the section entitled 'simplified API'.
    378. 

  378.  */
    379. 

  379. 

  380. /* Version information for png.h - this should match the version in png.c */
    381. 

  381. #define PNG_LIBPNG_VER_STRING "1.5.9"
    382. 

  382. #define PNG_HEADER_VERSION_STRING \
    383. 

  383.      " libpng version 1.5.9 - February 18, 2012\n"
    384. 

  384. 

  385. #define PNG_LIBPNG_VER_SONUM   15
    386. 

  386. #define PNG_LIBPNG_VER_DLLNUM  15
    387. 

  387. 

  388. /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
    389. 

  389. #define PNG_LIBPNG_VER_MAJOR   1
    390. 

  390. #define PNG_LIBPNG_VER_MINOR   5
    391. 

  391. #define PNG_LIBPNG_VER_RELEASE 9
    392. 

  392. 

  393. /* This should match the numeric part of the final component of
    394. 

  394.  * PNG_LIBPNG_VER_STRING, omitting any leading zero:
    395. 

  395.  */
    396. 

  396. 

  397. #define PNG_LIBPNG_VER_BUILD  0
    398. 

  398. 

  399. /* Release Status */
    400. 

  400. #define PNG_LIBPNG_BUILD_ALPHA    1
    401. 

  401. #define PNG_LIBPNG_BUILD_BETA     2
    402. 

  402. #define PNG_LIBPNG_BUILD_RC       3
    403. 

  403. #define PNG_LIBPNG_BUILD_STABLE   4
    404. 

  404. #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
    405. 

  405. 

  406. /* Release-Specific Flags */
    407. 

  407. #define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with
    408. 

  408.                                        PNG_LIBPNG_BUILD_STABLE only */
    409. 

  409. #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
    410. 

  410.                                        PNG_LIBPNG_BUILD_SPECIAL */
    411. 

  411. #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
    412. 

  412.                                        PNG_LIBPNG_BUILD_PRIVATE */
    413. 

  413. 

  414. #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA
    415. 

  415. 

  416. /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
    417. 

  417.  * We must not include leading zeros.
    418. 

  418.  * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
    419. 

  419.  * version 1.0.0 was mis-numbered 100 instead of 10000).  From
    420. 

  420.  * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
    421. 

  421.  */
    422. 

  422. #define PNG_LIBPNG_VER 10509 /* 1.5.9 */
    423. 

  423. 

  424. /* Library configuration: these options cannot be changed after
    425. 

  425.  * the library has been built.
    426. 

  426.  */
    427. 

  427. #ifndef PNGLCONF_H
    428. 

  428.     /* If pnglibconf.h is missing, you can
    429. 

  429.      * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h
    430. 

  430.      */
    431. 

  431. #   include "pnglibconf.h"
    432. 

  432. #endif
    433. 

  433. 

  434. #ifndef PNG_VERSION_INFO_ONLY
    435. 

  435. #  ifndef PNG_BUILDING_SYMBOL_TABLE
    436. 

  436.   /*
    437. 

  437.    *   Standard header files (not needed for the version info or while
    438. 

  438.    *   building symbol table -- see scripts/pnglibconf.dfa)
    439. 

  439.    */
    440. 

  440. #    ifdef PNG_SETJMP_SUPPORTED
    441. 

  441. #      include <setjmp.h>
    442. 

  442. #    endif
    443. 

  443. 

  444.     /* Need the time information for converting tIME chunks, it
    445. 

  445.      * defines struct tm:
    446. 

  446.      */
    447. 

  447. #    ifdef PNG_CONVERT_tIME_SUPPORTED
    448. 

  448.        /* "time.h" functions are not supported on all operating systems */
    449. 

  449. #      include <time.h>
    450. 

  450. #    endif
    451. 

  451. #  endif
    452. 

  452. 

  453. /* Machine specific configuration. */
    454. 

  454. #  include "pngconf.h"
    455. 

  455. #endif
    456. 

  456. 

  457. /*
    458. 

  458.  * Added at libpng-1.2.8
    459. 

  459.  *
    460. 

  460.  * Ref MSDN: Private as priority over Special
    461. 

  461.  * VS_FF_PRIVATEBUILD File *was not* built using standard release
    462. 

  462.  * procedures. If this value is given, the StringFileInfo block must
    463. 

  463.  * contain a PrivateBuild string.
    464. 

  464.  *
    465. 

  465.  * VS_FF_SPECIALBUILD File *was* built by the original company using
    466. 

  466.  * standard release procedures but is a variation of the standard
    467. 

  467.  * file of the same version number. If this value is given, the
    468. 

  468.  * StringFileInfo block must contain a SpecialBuild string.
    469. 

  469.  */
    470. 

  470. 

  471. #ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */
    472. 

  472. #  define PNG_LIBPNG_BUILD_TYPE \
    473. 

  473.        (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
    474. 

  474. #else
    475. 

  475. #  ifdef PNG_LIBPNG_SPECIALBUILD
    476. 

  476. #    define PNG_LIBPNG_BUILD_TYPE \
    477. 

  477.          (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
    478. 

  478. #  else
    479. 

  479. #    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
    480. 

  480. #  endif
    481. 

  481. #endif
    482. 

  482. 

  483. #ifndef PNG_VERSION_INFO_ONLY
    484. 

  484. 

  485. /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
    486. 

  486. #ifdef __cplusplus
    487. 

  487. extern "C" {
    488. 

  488. #endif /* __cplusplus */
    489. 

  489. 

  490. /* Version information for C files, stored in png.c.  This had better match
    491. 

  491.  * the version above.
    492. 

  492.  */
    493. 

  493. #define png_libpng_ver png_get_header_ver(NULL)
    494. 

  494. 

  495. /* This file is arranged in several sections:
    496. 

  496.  *
    497. 

  497.  * 1. Any configuration options that can be specified by for the application
    498. 

  498.  *    code when it is built.  (Build time configuration is in pnglibconf.h)
    499. 

  499.  * 2. Type definitions (base types are defined in pngconf.h), structure
    500. 

  500.  *    definitions.
    501. 

  501.  * 3. Exported library functions.
    502. 

  502.  *
    503. 

  503.  * The library source code has additional files (principally pngpriv.h) that
    504. 

  504.  * allow configuration of the library.
    505. 

  505.  */
    506. 

  506. /* Section 1: run time configuration
    507. 

  507.  * See pnglibconf.h for build time configuration
    508. 

  508.  *
    509. 

  509.  * Run time configuration allows the application to choose between
    510. 

  510.  * implementations of certain arithmetic APIs.  The default is set
    511. 

  511.  * at build time and recorded in pnglibconf.h, but it is safe to
    512. 

  512.  * override these (and only these) settings.  Note that this won't
    513. 

  513.  * change what the library does, only application code, and the
    514. 

  514.  * settings can (and probably should) be made on a per-file basis
    515. 

  515.  * by setting the #defines before including png.h
    516. 

  516.  *
    517. 

  517.  * Use macros to read integers from PNG data or use the exported
    518. 

  518.  * functions?
    519. 

  519.  *   PNG_USE_READ_MACROS: use the macros (see below)  Note that
    520. 

  520.  *     the macros evaluate their argument multiple times.
    521. 

  521.  *   PNG_NO_USE_READ_MACROS: call the relevant library function.
    522. 

  522.  *
    523. 

  523.  * Use the alternative algorithm for compositing alpha samples that
    524. 

  524.  * does not use division?
    525. 

  525.  *   PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division'
    526. 

  526.  *      algorithm.
    527. 

  527.  *   PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm.
    528. 

  528.  *
    529. 

  529.  * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is
    530. 

  530.  * false?
    531. 

  531.  *   PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error
    532. 

  532.  *      APIs to png_warning.
    533. 

  533.  * Otherwise the calls are mapped to png_error.
    534. 

  534.  */
    535. 

  535. 

  536. /* Section 2: type definitions, including structures and compile time
    537. 

  537.  * constants.
    538. 

  538.  * See pngconf.h for base types that vary by machine/system
    539. 

  539.  */
    540. 

  540. 

  541. /* This triggers a compiler error in png.c, if png.c and png.h
    542. 

  542.  * do not agree upon the version number.
    543. 

  543.  */
    544. 

  544. typedef char* png_libpng_version_1_5_9;
    545. 

  545. 

  546. /* Three color definitions.  The order of the red, green, and blue, (and the
    547. 

  547.  * exact size) is not important, although the size of the fields need to
    548. 

  548.  * be png_byte or png_uint_16 (as defined below).
    549. 

  549.  */
    550. 

  550. typedef struct png_color_struct
    551. 

  551. {
    552. 

  552.    png_byte red;
    553. 

  553.    png_byte green;
    554. 

  554.    png_byte blue;
    555. 

  555. } png_color;
    556. 

  556. typedef png_color FAR * png_colorp;
    557. 

  557. typedef PNG_CONST png_color FAR * png_const_colorp;
    558. 

  558. typedef png_color FAR * FAR * png_colorpp;
    559. 

  559. 

  560. typedef struct png_color_16_struct
    561. 

  561. {
    562. 

  562.    png_byte index;    /* used for palette files */
    563. 

  563.    png_uint_16 red;   /* for use in red green blue files */
    564. 

  564.    png_uint_16 green;
    565. 

  565.    png_uint_16 blue;
    566. 

  566.    png_uint_16 gray;  /* for use in grayscale files */
    567. 

  567. } png_color_16;
    568. 

  568. typedef png_color_16 FAR * png_color_16p;
    569. 

  569. typedef PNG_CONST png_color_16 FAR * png_const_color_16p;
    570. 

  570. typedef png_color_16 FAR * FAR * png_color_16pp;
    571. 

  571. 

  572. typedef struct png_color_8_struct
    573. 

  573. {
    574. 

  574.    png_byte red;   /* for use in red green blue files */
    575. 

  575.    png_byte green;
    576. 

  576.    png_byte blue;
    577. 

  577.    png_byte gray;  /* for use in grayscale files */
    578. 

  578.    png_byte alpha; /* for alpha channel files */
    579. 

  579. } png_color_8;
    580. 

  580. typedef png_color_8 FAR * png_color_8p;
    581. 

  581. typedef PNG_CONST png_color_8 FAR * png_const_color_8p;
    582. 

  582. typedef png_color_8 FAR * FAR * png_color_8pp;
    583. 

  583. 

  584. /*
    585. 

  585.  * The following two structures are used for the in-core representation
    586. 

  586.  * of sPLT chunks.
    587. 

  587.  */
    588. 

  588. typedef struct png_sPLT_entry_struct
    589. 

  589. {
    590. 

  590.    png_uint_16 red;
    591. 

  591.    png_uint_16 green;
    592. 

  592.    png_uint_16 blue;
    593. 

  593.    png_uint_16 alpha;
    594. 

  594.    png_uint_16 frequency;
    595. 

  595. } png_sPLT_entry;
    596. 

  596. typedef png_sPLT_entry FAR * png_sPLT_entryp;
    597. 

  597. typedef PNG_CONST png_sPLT_entry FAR * png_const_sPLT_entryp;
    598. 

  598. typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
    599. 

  599. 

  600. /*  When the depth of the sPLT palette is 8 bits, the color and alpha samples
    601. 

  601.  *  occupy the LSB of their respective members, and the MSB of each member
    602. 

  602.  *  is zero-filled.  The frequency member always occupies the full 16 bits.
    603. 

  603.  */
    604. 

  604. 

  605. typedef struct png_sPLT_struct
    606. 

  606. {
    607. 

  607.    png_charp name;           /* palette name */
    608. 

  608.    png_byte depth;           /* depth of palette samples */
    609. 

  609.    png_sPLT_entryp entries;  /* palette entries */
    610. 

  610.    png_int_32 nentries;      /* number of palette entries */
    611. 

  611. } png_sPLT_t;
    612. 

  612. typedef png_sPLT_t FAR * png_sPLT_tp;
    613. 

  613. typedef PNG_CONST png_sPLT_t FAR * png_const_sPLT_tp;
    614. 

  614. typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
    615. 

  615. 

  616. #ifdef PNG_TEXT_SUPPORTED
    617. 

  617. /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
    618. 

  618.  * and whether that contents is compressed or not.  The "key" field
    619. 

  619.  * points to a regular zero-terminated C string.  The "text" fields can be a
    620. 

  620.  * regular C string, an empty string, or a NULL pointer.
    621. 

  621.  * However, the structure returned by png_get_text() will always contain
    622. 

  622.  * the "text" field as a regular zero-terminated C string (possibly
    623. 

  623.  * empty), never a NULL pointer, so it can be safely used in printf() and
    624. 

  624.  * other string-handling functions.  Note that the "itxt_length", "lang", and
    625. 

  625.  * "lang_key" members of the structure only exist when the library is built
    626. 

  626.  * with iTXt chunk support.  Prior to libpng-1.4.0 the library was built by
    627. 

  627.  * default without iTXt support. Also note that when iTXt *is* supported,
    628. 

  628.  * the "lang" and "lang_key" fields contain NULL pointers when the
    629. 

  629.  * "compression" field contains * PNG_TEXT_COMPRESSION_NONE or
    630. 

  630.  * PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the
    631. 

  631.  * same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag"
    632. 

  632.  * which is always 0 or 1, or its "compression method" which is always 0.
    633. 

  633.  */
    634. 

  634. typedef struct png_text_struct
    635. 

  635. {
    636. 

  636.    int  compression;       /* compression value:
    637. 

  637.                              -1: tEXt, none
    638. 

  638.                               0: zTXt, deflate
    639. 

  639.                               1: iTXt, none
    640. 

  640.                               2: iTXt, deflate  */
    641. 

  641.    png_charp key;          /* keyword, 1-79 character description of "text" */
    642. 

  642.    png_charp text;         /* comment, may be an empty string (ie "")
    643. 

  643.                               or a NULL pointer */
    644. 

  644.    png_size_t text_length; /* length of the text string */
    645. 

  645.    png_size_t itxt_length; /* length of the itxt string */
    646. 

  646.    png_charp lang;         /* language code, 0-79 characters
    647. 

  647.                               or a NULL pointer */
    648. 

  648.    png_charp lang_key;     /* keyword translated UTF-8 string, 0 or more
    649. 

  649.                               chars or a NULL pointer */
    650. 

  650. } png_text;
    651. 

  651. typedef png_text FAR * png_textp;
    652. 

  652. typedef PNG_CONST png_text FAR * png_const_textp;
    653. 

  653. typedef png_text FAR * FAR * png_textpp;
    654. 

  654. #endif
    655. 

  655. 

  656. /* Supported compression types for text in PNG files (tEXt, and zTXt).
    657. 

  657.  * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
    658. 

  658. #define PNG_TEXT_COMPRESSION_NONE_WR -3
    659. 

  659. #define PNG_TEXT_COMPRESSION_zTXt_WR -2
    660. 

  660. #define PNG_TEXT_COMPRESSION_NONE    -1
    661. 

  661. #define PNG_TEXT_COMPRESSION_zTXt     0
    662. 

  662. #define PNG_ITXT_COMPRESSION_NONE     1
    663. 

  663. #define PNG_ITXT_COMPRESSION_zTXt     2
    664. 

  664. #define PNG_TEXT_COMPRESSION_LAST     3  /* Not a valid value */
    665. 

  665. 

  666. /* png_time is a way to hold the time in an machine independent way.
    667. 

  667.  * Two conversions are provided, both from time_t and struct tm.  There
    668. 

  668.  * is no portable way to convert to either of these structures, as far
    669. 

  669.  * as I know.  If you know of a portable way, send it to me.  As a side
    670. 

  670.  * note - PNG has always been Year 2000 compliant!
    671. 

  671.  */
    672. 

  672. typedef struct png_time_struct
    673. 

  673. {
    674. 

  674.    png_uint_16 year; /* full year, as in, 1995 */
    675. 

  675.    png_byte month;   /* month of year, 1 - 12 */
    676. 

  676.    png_byte day;     /* day of month, 1 - 31 */
    677. 

  677.    png_byte hour;    /* hour of day, 0 - 23 */
    678. 

  678.    png_byte minute;  /* minute of hour, 0 - 59 */
    679. 

  679.    png_byte second;  /* second of minute, 0 - 60 (for leap seconds) */
    680. 

  680. } png_time;
    681. 

  681. typedef png_time FAR * png_timep;
    682. 

  682. typedef PNG_CONST png_time FAR * png_const_timep;
    683. 

  683. typedef png_time FAR * FAR * png_timepp;
    684. 

  684. 

  685. #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
    686. 

  686.     defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
    687. 

  687. /* png_unknown_chunk is a structure to hold queued chunks for which there is
    688. 

  688.  * no specific support.  The idea is that we can use this to queue
    689. 

  689.  * up private chunks for output even though the library doesn't actually
    690. 

  690.  * know about their semantics.
    691. 

  691.  */
    692. 

  692. typedef struct png_unknown_chunk_t
    693. 

  693. {
    694. 

  694.     png_byte name[5];
    695. 

  695.     png_byte *data;
    696. 

  696.     png_size_t size;
    697. 

  697. 

  698.     /* libpng-using applications should NOT directly modify this byte. */
    699. 

  699.     png_byte location; /* mode of operation at read time */
    700. 

  700. }
    701. 

  701. 

  702. 

  703. png_unknown_chunk;
    704. 

  704. typedef png_unknown_chunk FAR * png_unknown_chunkp;
    705. 

  705. typedef PNG_CONST png_unknown_chunk FAR * png_const_unknown_chunkp;
    706. 

  706. typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
    707. 

  707. #endif
    708. 

  708. 

  709. /* Values for the unknown chunk location byte */
    710. 

  710. 

  711. #define PNG_HAVE_IHDR  0x01
    712. 

  712. #define PNG_HAVE_PLTE  0x02
    713. 

  713. #define PNG_AFTER_IDAT 0x08
    714. 

  714. 

  715. /* The complete definition of png_info has, as of libpng-1.5.0,
    716. 

  716.  * been moved into a separate header file that is not accessible to
    717. 

  717.  * applications.  Read libpng-manual.txt or libpng.3 for more info.
    718. 

  718.  */
    719. 

  719. typedef struct png_info_def png_info;
    720. 

  720. typedef png_info FAR * png_infop;
    721. 

  721. typedef PNG_CONST png_info FAR * png_const_infop;
    722. 

  722. typedef png_info FAR * FAR * png_infopp;
    723. 

  723. 

  724. /* Maximum positive integer used in PNG is (2^31)-1 */
    725. 

  725. #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
    726. 

  726. #define PNG_UINT_32_MAX ((png_uint_32)(-1))
    727. 

  727. #define PNG_SIZE_MAX ((png_size_t)(-1))
    728. 

  728. 

  729. /* These are constants for fixed point values encoded in the
    730. 

  730.  * PNG specification manner (x100000)
    731. 

  731.  */
    732. 

  732. #define PNG_FP_1    100000
    733. 

  733. #define PNG_FP_HALF  50000
    734. 

  734. #define PNG_FP_MAX  ((png_fixed_point)0x7fffffffL)
    735. 

  735. #define PNG_FP_MIN  (-PNG_FP_MAX)
    736. 

  736. 

  737. /* These describe the color_type field in png_info. */
    738. 

  738. /* color type masks */
    739. 

  739. #define PNG_COLOR_MASK_PALETTE    1
    740. 

  740. #define PNG_COLOR_MASK_COLOR      2
    741. 

  741. #define PNG_COLOR_MASK_ALPHA      4
    742. 

  742. 

  743. /* color types.  Note that not all combinations are legal */
    744. 

  744. #define PNG_COLOR_TYPE_GRAY 0
    745. 

  745. #define PNG_COLOR_TYPE_PALETTE  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
    746. 

  746. #define PNG_COLOR_TYPE_RGB        (PNG_COLOR_MASK_COLOR)
    747. 

  747. #define PNG_COLOR_TYPE_RGB_ALPHA  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
    748. 

  748. #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
    749. 

  749. /* aliases */
    750. 

  750. #define PNG_COLOR_TYPE_RGBA  PNG_COLOR_TYPE_RGB_ALPHA
    751. 

  751. #define PNG_COLOR_TYPE_GA  PNG_COLOR_TYPE_GRAY_ALPHA
    752. 

  752. 

  753. /* This is for compression type. PNG 1.0-1.2 only define the single type. */
    754. 

  754. #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
    755. 

  755. #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
    756. 

  756. 

  757. /* This is for filter type. PNG 1.0-1.2 only define the single type. */
    758. 

  758. #define PNG_FILTER_TYPE_BASE      0 /* Single row per-byte filtering */
    759. 

  759. #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
    760. 

  760. #define PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE
    761. 

  761. 

  762. /* These are for the interlacing type.  These values should NOT be changed. */
    763. 

  763. #define PNG_INTERLACE_NONE        0 /* Non-interlaced image */
    764. 

  764. #define PNG_INTERLACE_ADAM7       1 /* Adam7 interlacing */
    765. 

  765. #define PNG_INTERLACE_LAST        2 /* Not a valid value */
    766. 

  766. 

  767. /* These are for the oFFs chunk.  These values should NOT be changed. */
    768. 

  768. #define PNG_OFFSET_PIXEL          0 /* Offset in pixels */
    769. 

  769. #define PNG_OFFSET_MICROMETER     1 /* Offset in micrometers (1/10^6 meter) */
    770. 

  770. #define PNG_OFFSET_LAST           2 /* Not a valid value */
    771. 

  771. 

  772. /* These are for the pCAL chunk.  These values should NOT be changed. */
    773. 

  773. #define PNG_EQUATION_LINEAR       0 /* Linear transformation */
    774. 

  774. #define PNG_EQUATION_BASE_E       1 /* Exponential base e transform */
    775. 

  775. #define PNG_EQUATION_ARBITRARY    2 /* Arbitrary base exponential transform */
    776. 

  776. #define PNG_EQUATION_HYPERBOLIC   3 /* Hyperbolic sine transformation */
    777. 

  777. #define PNG_EQUATION_LAST         4 /* Not a valid value */
    778. 

  778. 

  779. /* These are for the sCAL chunk.  These values should NOT be changed. */
    780. 

  780. #define PNG_SCALE_UNKNOWN         0 /* unknown unit (image scale) */
    781. 

  781. #define PNG_SCALE_METER           1 /* meters per pixel */
    782. 

  782. #define PNG_SCALE_RADIAN          2 /* radians per pixel */
    783. 

  783. #define PNG_SCALE_LAST            3 /* Not a valid value */
    784. 

  784. 

  785. /* These are for the pHYs chunk.  These values should NOT be changed. */
    786. 

  786. #define PNG_RESOLUTION_UNKNOWN    0 /* pixels/unknown unit (aspect ratio) */
    787. 

  787. #define PNG_RESOLUTION_METER      1 /* pixels/meter */
    788. 

  788. #define PNG_RESOLUTION_LAST       2 /* Not a valid value */
    789. 

  789. 

  790. /* These are for the sRGB chunk.  These values should NOT be changed. */
    791. 

  791. #define PNG_sRGB_INTENT_PERCEPTUAL 0
    792. 

  792. #define PNG_sRGB_INTENT_RELATIVE   1
    793. 

  793. #define PNG_sRGB_INTENT_SATURATION 2
    794. 

  794. #define PNG_sRGB_INTENT_ABSOLUTE   3
    795. 

  795. #define PNG_sRGB_INTENT_LAST       4 /* Not a valid value */
    796. 

  796. 

  797. /* This is for text chunks */
    798. 

  798. #define PNG_KEYWORD_MAX_LENGTH     79
    799. 

  799. 

  800. /* Maximum number of entries in PLTE/sPLT/tRNS arrays */
    801. 

  801. #define PNG_MAX_PALETTE_LENGTH    256
    802. 

  802. 

  803. /* These determine if an ancillary chunk's data has been successfully read
    804. 

  804.  * from the PNG header, or if the application has filled in the corresponding
    805. 

  805.  * data in the info_struct to be written into the output file.  The values
    806. 

  806.  * of the PNG_INFO_<chunk> defines should NOT be changed.
    807. 

  807.  */
    808. 

  808. #define PNG_INFO_gAMA 0x0001
    809. 

  809. #define PNG_INFO_sBIT 0x0002
    810. 

  810. #define PNG_INFO_cHRM 0x0004
    811. 

  811. #define PNG_INFO_PLTE 0x0008
    812. 

  812. #define PNG_INFO_tRNS 0x0010
    813. 

  813. #define PNG_INFO_bKGD 0x0020
    814. 

  814. #define PNG_INFO_hIST 0x0040
    815. 

  815. #define PNG_INFO_pHYs 0x0080
    816. 

  816. #define PNG_INFO_oFFs 0x0100
    817. 

  817. #define PNG_INFO_tIME 0x0200
    818. 

  818. #define PNG_INFO_pCAL 0x0400
    819. 

  819. #define PNG_INFO_sRGB 0x0800   /* GR-P, 0.96a */
    820. 

  820. #define PNG_INFO_iCCP 0x1000   /* ESR, 1.0.6 */
    821. 

  821. #define PNG_INFO_sPLT 0x2000   /* ESR, 1.0.6 */
    822. 

  822. #define PNG_INFO_sCAL 0x4000   /* ESR, 1.0.6 */
    823. 

  823. #define PNG_INFO_IDAT 0x8000   /* ESR, 1.0.6 */
    824. 

  824. 

  825. /* This is used for the transformation routines, as some of them
    826. 

  826.  * change these values for the row.  It also should enable using
    827. 

  827.  * the routines for other purposes.
    828. 

  828.  */
    829. 

  829. typedef struct png_row_info_struct
    830. 

  830. {
    831. 

  831.    png_uint_32 width;    /* width of row */
    832. 

  832.    png_size_t rowbytes;  /* number of bytes in row */
    833. 

  833.    png_byte color_type;  /* color type of row */
    834. 

  834.    png_byte bit_depth;   /* bit depth of row */
    835. 

  835.    png_byte channels;    /* number of channels (1, 2, 3, or 4) */
    836. 

  836.    png_byte pixel_depth; /* bits per pixel (depth * channels) */
    837. 

  837. } png_row_info;
    838. 

  838. 

  839. typedef png_row_info FAR * png_row_infop;
    840. 

  840. typedef png_row_info FAR * FAR * png_row_infopp;
    841. 

  841. 

  842. /* The complete definition of png_struct has, as of libpng-1.5.0,
    843. 

  843.  * been moved into a separate header file that is not accessible to
    844. 

  844.  * applications.  Read libpng-manual.txt or libpng.3 for more info.
    845. 

  845.  */
    846. 

  846. typedef struct png_struct_def png_struct;
    847. 

  847. typedef PNG_CONST png_struct FAR * png_const_structp;
    848. 

  848. typedef png_struct FAR * png_structp;
    849. 

  849. 

  850. /* These are the function types for the I/O functions and for the functions
    851. 

  851.  * that allow the user to override the default I/O functions with his or her
    852. 

  852.  * own.  The png_error_ptr type should match that of user-supplied warning
    853. 

  853.  * and error functions, while the png_rw_ptr type should match that of the
    854. 

  854.  * user read/write data functions.  Note that the 'write' function must not
    855. 

  855.  * modify the buffer it is passed. The 'read' function, on the other hand, is
    856. 

  856.  * expected to return the read data in the buffer.
    857. 

  857.  */
    858. 

  858. typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp));
    859. 

  859. typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t));
    860. 

  860. typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp));
    861. 

  861. typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32,
    862. 

  862.     int));
    863. 

  863. typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32,
    864. 

  864.     int));
    865. 

  865. 

  866. #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
    867. 

  867. typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop));
    868. 

  868. typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop));
    869. 

  869. 

  870. /* The following callback receives png_uint_32 row_number, int pass for the
    871. 

  871.  * png_bytep data of the row.  When transforming an interlaced image the
    872. 

  872.  * row number is the row number within the sub-image of the interlace pass, so
    873. 

  873.  * the value will increase to the height of the sub-image (not the full image)
    874. 

  874.  * then reset to 0 for the next pass.
    875. 

  875.  *
    876. 

  876.  * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
    877. 

  877.  * find the output pixel (x,y) given an interlaced sub-image pixel
    878. 

  878.  * (row,col,pass).  (See below for these macros.)
    879. 

  879.  */
    880. 

  880. typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep,
    881. 

  881.     png_uint_32, int));
    882. 

  882. #endif
    883. 

  883. 

  884. #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
    885. 

  885.     defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
    886. 

  886. typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop,
    887. 

  887.     png_bytep));
    888. 

  888. #endif
    889. 

  889. 

  890. #ifdef PNG_USER_CHUNKS_SUPPORTED
    891. 

  891. typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp,
    892. 

  892.     png_unknown_chunkp));
    893. 

  893. #endif
    894. 

  894. #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
    895. 

  895. typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp));
    896. 

  896. #endif
    897. 

  897. 

  898. #ifdef PNG_SETJMP_SUPPORTED
    899. 

  899. /* This must match the function definition in <setjmp.h>, and the application
    900. 

  900.  * must include this before png.h to obtain the definition of jmp_buf.  The
    901. 

  901.  * function is required to be PNG_NORETURN, but this is not checked.  If the
    902. 

  902.  * function does return the application will crash via an abort() or similar
    903. 

  903.  * system level call.
    904. 

  904.  *
    905. 

  905.  * If you get a warning here while building the library you may need to make
    906. 

  906.  * changes to ensure that pnglibconf.h records the calling convention used by
    907. 

  907.  * your compiler.  This may be very difficult - try using a different compiler
    908. 

  908.  * to build the library!
    909. 

  909.  */
    910. 

  910. PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef);
    911. 

  911. #endif
    912. 

  912. 

  913. /* Transform masks for the high-level interface */
    914. 

  914. #define PNG_TRANSFORM_IDENTITY       0x0000    /* read and write */
    915. 

  915. #define PNG_TRANSFORM_STRIP_16       0x0001    /* read only */
    916. 

  916. #define PNG_TRANSFORM_STRIP_ALPHA    0x0002    /* read only */
    917. 

  917. #define PNG_TRANSFORM_PACKING        0x0004    /* read and write */
    918. 

  918. #define PNG_TRANSFORM_PACKSWAP       0x0008    /* read and write */
    919. 

  919. #define PNG_TRANSFORM_EXPAND         0x0010    /* read only */
    920. 

  920. #define PNG_TRANSFORM_INVERT_MONO    0x0020    /* read and write */
    921. 

  921. #define PNG_TRANSFORM_SHIFT          0x0040    /* read and write */
    922. 

  922. #define PNG_TRANSFORM_BGR            0x0080    /* read and write */
    923. 

  923. #define PNG_TRANSFORM_SWAP_ALPHA     0x0100    /* read and write */
    924. 

  924. #define PNG_TRANSFORM_SWAP_ENDIAN    0x0200    /* read and write */
    925. 

  925. #define PNG_TRANSFORM_INVERT_ALPHA   0x0400    /* read and write */
    926. 

  926. #define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* write only */
    927. 

  927. /* Added to libpng-1.2.34 */
    928. 

  928. #define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER
    929. 

  929. #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */
    930. 

  930. /* Added to libpng-1.4.0 */
    931. 

  931. #define PNG_TRANSFORM_GRAY_TO_RGB   0x2000      /* read only */
    932. 

  932. /* Added to libpng-1.5.4 */
    933. 

  933. #define PNG_TRANSFORM_EXPAND_16     0x4000      /* read only */
    934. 

  934. #define PNG_TRANSFORM_SCALE_16      0x8000      /* read only */
    935. 

  935. 

  936. /* Flags for MNG supported features */
    937. 

  937. #define PNG_FLAG_MNG_EMPTY_PLTE     0x01
    938. 

  938. #define PNG_FLAG_MNG_FILTER_64      0x04
    939. 

  939. #define PNG_ALL_MNG_FEATURES        0x05
    940. 

  940. 

  941. /* NOTE: prior to 1.5 these functions had no 'API' style declaration,
    942. 

  942.  * this allowed the zlib default functions to be used on Windows
    943. 

  943.  * platforms.  In 1.5 the zlib default malloc (which just calls malloc and
    944. 

  944.  * ignores the first argument) should be completely compatible with the
    945. 

  945.  * following.
    946. 

  946.  */
    947. 

  947. typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp,
    948. 

  948.     png_alloc_size_t));
    949. 

  949. typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp));
    950. 

  950. 

  951. typedef png_struct FAR * FAR * png_structpp;
    952. 

  952. 

  953. /* Section 3: exported functions
    954. 

  954.  * Here are the function definitions most commonly used.  This is not
    955. 

  955.  * the place to find out how to use libpng.  See libpng-manual.txt for the
    956. 

  956.  * full explanation, see example.c for the summary.  This just provides
    957. 

  957.  * a simple one line description of the use of each function.
    958. 

  958.  *
    959. 

  959.  * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in
    960. 

  960.  * pngconf.h and in the *.dfn files in the scripts directory.
    961. 

  961.  *
    962. 

  962.  *   PNG_EXPORT(ordinal, type, name, (args));
    963. 

  963.  *
    964. 

  964.  *       ordinal:    ordinal that is used while building
    965. 

  965.  *                   *.def files. The ordinal value is only
    966. 

  966.  *                   relevant when preprocessing png.h with
    967. 

  967.  *                   the *.dfn files for building symbol table
    968. 

  968.  *                   entries, and are removed by pngconf.h.
    969. 

  969.  *       type:       return type of the function
    970. 

  970.  *       name:       function name
    971. 

  971.  *       args:       function arguments, with types
    972. 

  972.  *
    973. 

  973.  * When we wish to append attributes to a function prototype we use
    974. 

  974.  * the PNG_EXPORTA() macro instead.
    975. 

  975.  *
    976. 

  976.  *   PNG_EXPORTA(ordinal, type, name, (args), attributes);
    977. 

  977.  *
    978. 

  978.  *       ordinal, type, name, and args: same as in PNG_EXPORT().
    979. 

  979.  *       attributes: function attributes
    980. 

  980.  */
    981. 

  981. 

  982. /* Returns the version number of the library */
    983. 

  983. PNG_EXPORT(1, png_uint_32, png_access_version_number, (void));
    984. 

  984. 

  985. /* Tell lib we have already handled the first <num_bytes> magic bytes.
    986. 

  986.  * Handling more than 8 bytes from the beginning of the file is an error.
    987. 

  987.  */
    988. 

  988. PNG_EXPORT(2, void, png_set_sig_bytes, (png_structp png_ptr, int num_bytes));
    989. 

  989. 

  990. /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
    991. 

  991.  * PNG file.  Returns zero if the supplied bytes match the 8-byte PNG
    992. 

  992.  * signature, and non-zero otherwise.  Having num_to_check == 0 or
    993. 

  993.  * start > 7 will always fail (ie return non-zero).
    994. 

  994.  */
    995. 

  995. PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start,
    996. 

  996.     png_size_t num_to_check));
    997. 

  997. 

  998. /* Simple signature checking function.  This is the same as calling
    999. 

  999.  * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
    1000. 

  1000.  */
    1001. 

  1001. #define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n))
    1002. 

  1002. 

  1003. /* Allocate and initialize png_ptr struct for reading, and any other memory. */
    1004. 

  1004. PNG_EXPORTA(4, png_structp, png_create_read_struct,
    1005. 

  1005.     (png_const_charp user_png_ver, png_voidp error_ptr,
    1006. 

  1006.     png_error_ptr error_fn, png_error_ptr warn_fn),
    1007. 

  1007.     PNG_ALLOCATED);
    1008. 

  1008. 

  1009. /* Allocate and initialize png_ptr struct for writing, and any other memory */
    1010. 

  1010. PNG_EXPORTA(5, png_structp, png_create_write_struct,
    1011. 

  1011.     (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
    1012. 

  1012.     png_error_ptr warn_fn),
    1013. 

  1013.     PNG_ALLOCATED);
    1014. 

  1014. 

  1015. PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size,
    1016. 

  1016.     (png_const_structp png_ptr));
    1017. 

  1017. 

  1018. PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr,
    1019. 

  1019.     png_size_t size));
    1020. 

  1020. 

  1021. /* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp
    1022. 

  1022.  * match up.
    1023. 

  1023.  */
    1024. 

  1024. #ifdef PNG_SETJMP_SUPPORTED
    1025. 

  1025. /* This function returns the jmp_buf built in to *png_ptr.  It must be
    1026. 

  1026.  * supplied with an appropriate 'longjmp' function to use on that jmp_buf
    1027. 

  1027.  * unless the default error function is overridden in which case NULL is
    1028. 

  1028.  * acceptable.  The size of the jmp_buf is checked against the actual size
    1029. 

  1029.  * allocated by the library - the call will return NULL on a mismatch
    1030. 

  1030.  * indicating an ABI mismatch.
    1031. 

  1031.  */
    1032. 

  1032. PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structp png_ptr,
    1033. 

  1033.     png_longjmp_ptr longjmp_fn, size_t jmp_buf_size));
    1034. 

  1034. #  define png_jmpbuf(png_ptr) \
    1035. 

  1035.       (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf)))
    1036. 

  1036. #else
    1037. 

  1037. #  define png_jmpbuf(png_ptr) \
    1038. 

  1038.       (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP)
    1039. 

  1039. #endif
    1040. 

  1040. /* This function should be used by libpng applications in place of
    1041. 

  1041.  * longjmp(png_ptr->jmpbuf, val).  If longjmp_fn() has been set, it
    1042. 

  1042.  * will use it; otherwise it will call PNG_ABORT().  This function was
    1043. 

  1043.  * added in libpng-1.5.0.
    1044. 

  1044.  */
    1045. 

  1045. PNG_EXPORTA(9, void, png_longjmp, (png_structp png_ptr, int val),
    1046. 

  1046.     PNG_NORETURN);
    1047. 

  1047. 

  1048. #ifdef PNG_READ_SUPPORTED
    1049. 

  1049. /* Reset the compression stream */
    1050. 

  1050. PNG_EXPORT(10, int, png_reset_zstream, (png_structp png_ptr));
    1051. 

  1051. #endif
    1052. 

  1052. 

  1053. /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
    1054. 

  1054. #ifdef PNG_USER_MEM_SUPPORTED
    1055. 

  1055. PNG_EXPORTA(11, png_structp, png_create_read_struct_2,
    1056. 

  1056.     (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
    1057. 

  1057.     png_error_ptr warn_fn,
    1058. 

  1058.     png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
    1059. 

  1059.     PNG_ALLOCATED);
    1060. 

  1060. PNG_EXPORTA(12, png_structp, png_create_write_struct_2,
    1061. 

  1061.     (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
    1062. 

  1062.     png_error_ptr warn_fn,
    1063. 

  1063.     png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
    1064. 

  1064.     PNG_ALLOCATED);
    1065. 

  1065. #endif
    1066. 

  1066. 

  1067. /* Write the PNG file signature. */
    1068. 

  1068. PNG_EXPORT(13, void, png_write_sig, (png_structp png_ptr));
    1069. 

  1069. 

  1070. /* Write a PNG chunk - size, type, (optional) data, CRC. */
    1071. 

  1071. PNG_EXPORT(14, void, png_write_chunk, (png_structp png_ptr, png_const_bytep
    1072. 

  1072.     chunk_name, png_const_bytep data, png_size_t length));
    1073. 

  1073. 

  1074. /* Write the start of a PNG chunk - length and chunk name. */
    1075. 

  1075. PNG_EXPORT(15, void, png_write_chunk_start, (png_structp png_ptr,
    1076. 

  1076.     png_const_bytep chunk_name, png_uint_32 length));
    1077. 

  1077. 

  1078. /* Write the data of a PNG chunk started with png_write_chunk_start(). */
    1079. 

  1079. PNG_EXPORT(16, void, png_write_chunk_data, (png_structp png_ptr,
    1080. 

  1080.     png_const_bytep data, png_size_t length));
    1081. 

  1081. 

  1082. /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
    1083. 

  1083. PNG_EXPORT(17, void, png_write_chunk_end, (png_structp png_ptr));
    1084. 

  1084. 

  1085. /* Allocate and initialize the info structure */
    1086. 

  1086. PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_structp png_ptr),
    1087. 

  1087.     PNG_ALLOCATED);
    1088. 

  1088. 

  1089. PNG_EXPORT(19, void, png_info_init_3, (png_infopp info_ptr,
    1090. 

  1090.     png_size_t png_info_struct_size));
    1091. 

  1091. 

  1092. /* Writes all the PNG information before the image. */
    1093. 

  1093. PNG_EXPORT(20, void, png_write_info_before_PLTE,
    1094. 

  1094.     (png_structp png_ptr, png_infop info_ptr));
    1095. 

  1095. PNG_EXPORT(21, void, png_write_info,
    1096. 

  1096.     (png_structp png_ptr, png_infop info_ptr));
    1097. 

  1097. 

  1098. #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
    1099. 

  1099. /* Read the information before the actual image data. */
    1100. 

  1100. PNG_EXPORT(22, void, png_read_info,
    1101. 

  1101.     (png_structp png_ptr, png_infop info_ptr));
    1102. 

  1102. #endif
    1103. 

  1103. 

  1104. #ifdef PNG_TIME_RFC1123_SUPPORTED
    1105. 

  1105. PNG_EXPORT(23, png_const_charp, png_convert_to_rfc1123,
    1106. 

  1106.     (png_structp png_ptr,
    1107. 

  1107.     png_const_timep ptime));
    1108. 

  1108. #endif
    1109. 

  1109. 

  1110. #ifdef PNG_CONVERT_tIME_SUPPORTED
    1111. 

  1111. /* Convert from a struct tm to png_time */
    1112. 

  1112. PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime,
    1113. 

  1113.     PNG_CONST struct tm FAR * ttime));
    1114. 

  1114. 

  1115. /* Convert from time_t to png_time.  Uses gmtime() */
    1116. 

  1116. PNG_EXPORT(25, void, png_convert_from_time_t,
    1117. 

  1117.     (png_timep ptime, time_t ttime));
    1118. 

  1118. #endif /* PNG_CONVERT_tIME_SUPPORTED */
    1119. 

  1119. 

  1120. #ifdef PNG_READ_EXPAND_SUPPORTED
    1121. 

  1121. /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
    1122. 

  1122. PNG_EXPORT(26, void, png_set_expand, (png_structp png_ptr));
    1123. 

  1123. PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structp png_ptr));
    1124. 

  1124. PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structp png_ptr));
    1125. 

  1125. PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structp png_ptr));
    1126. 

  1126. #endif
    1127. 

  1127. 

  1128. #ifdef PNG_READ_EXPAND_16_SUPPORTED
    1129. 

  1129. /* Expand to 16-bit channels, forces conversion of palette to RGB and expansion
    1130. 

  1130.  * of a tRNS chunk if present.
    1131. 

  1131.  */
    1132. 

  1132. PNG_EXPORT(221, void, png_set_expand_16, (png_structp png_ptr));
    1133. 

  1133. #endif
    1134. 

  1134. 

  1135. #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
    1136. 

  1136. /* Use blue, green, red order for pixels. */
    1137. 

  1137. PNG_EXPORT(30, void, png_set_bgr, (png_structp png_ptr));
    1138. 

  1138. #endif
    1139. 

  1139. 

  1140. #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
    1141. 

  1141. /* Expand the grayscale to 24-bit RGB if necessary. */
    1142. 

  1142. PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structp png_ptr));
    1143. 

  1143. #endif
    1144. 

  1144. 

  1145. #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
    1146. 

  1146. /* Reduce RGB to grayscale. */
    1147. 

  1147. #define PNG_ERROR_ACTION_NONE  1
    1148. 

  1148. #define PNG_ERROR_ACTION_WARN  2
    1149. 

  1149. #define PNG_ERROR_ACTION_ERROR 3
    1150. 

  1150. #define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/
    1151. 

  1151. 

  1152. PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structp png_ptr,
    1153. 

  1153.     int error_action, double red, double green));
    1154. 

  1154. PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structp png_ptr,
    1155. 

  1155.     int error_action, png_fixed_point red, png_fixed_point green));
    1156. 

  1156. 

  1157. PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structp
    1158. 

  1158.     png_ptr));
    1159. 

  1159. #endif
    1160. 

  1160. 

  1161. #ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED
    1162. 

  1162. PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth,
    1163. 

  1163.     png_colorp palette));
    1164. 

  1164. #endif
    1165. 

  1165. 

  1166. #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
    1167. 

  1167. /* How the alpha channel is interpreted - this affects how the color channels of
    1168. 

  1168.  * a PNG file are returned when an alpha channel, or tRNS chunk in a palette
    1169. 

  1169.  * file, is present.
    1170. 

  1170.  *
    1171. 

  1171.  * This has no effect on the w…
    1172.