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Revision 31 - (show annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (10 years, 2 months ago) by william
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committing r3113 initial commit again...
1 /* png.h - header file for PNG reference library
2 *
3 * libpng version 1.2.39 - August 13, 2009
4 * Copyright (c) 1998-2009 Glenn Randers-Pehrson
5 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
6 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
7 *
8 * This code is released under the libpng license (See LICENSE, below)
9 *
10 * Authors and maintainers:
11 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
12 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
13 * libpng versions 0.97, January 1998, through 1.2.39 - August 13, 2009: Glenn
14 * See also "Contributing Authors", below.
15 *
16 * Note about libpng version numbers:
17 *
18 * Due to various miscommunications, unforeseen code incompatibilities
19 * and occasional factors outside the authors' control, version numbering
20 * on the library has not always been consistent and straightforward.
21 * The following table summarizes matters since version 0.89c, which was
22 * the first widely used release:
23 *
24 * source png.h png.h shared-lib
25 * version string int version
26 * ------- ------ ----- ----------
27 * 0.89c "1.0 beta 3" 0.89 89 1.0.89
28 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
29 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
30 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
31 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
32 * 0.97c 0.97 97 2.0.97
33 * 0.98 0.98 98 2.0.98
34 * 0.99 0.99 98 2.0.99
35 * 0.99a-m 0.99 99 2.0.99
36 * 1.00 1.00 100 2.1.0 [100 should be 10000]
37 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
38 * 1.0.1 png.h string is 10001 2.1.0
39 * 1.0.1a-e identical to the 10002 from here on, the shared library
40 * 1.0.2 source version) 10002 is 2.V where V is the source code
41 * 1.0.2a-b 10003 version, except as noted.
42 * 1.0.3 10003
43 * 1.0.3a-d 10004
44 * 1.0.4 10004
45 * 1.0.4a-f 10005
46 * 1.0.5 (+ 2 patches) 10005
47 * 1.0.5a-d 10006
48 * 1.0.5e-r 10100 (not source compatible)
49 * 1.0.5s-v 10006 (not binary compatible)
50 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
51 * 1.0.6d-f 10007 (still binary incompatible)
52 * 1.0.6g 10007
53 * 1.0.6h 10007 10.6h (testing xy.z so-numbering)
54 * 1.0.6i 10007 10.6i
55 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
56 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
57 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
58 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
59 * 1.0.7 1 10007 (still compatible)
60 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
61 * 1.0.8rc1 1 10008 2.1.0.8rc1
62 * 1.0.8 1 10008 2.1.0.8
63 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
64 * 1.0.9rc1 1 10009 2.1.0.9rc1
65 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
66 * 1.0.9rc2 1 10009 2.1.0.9rc2
67 * 1.0.9 1 10009 2.1.0.9
68 * 1.0.10beta1 1 10010 2.1.0.10beta1
69 * 1.0.10rc1 1 10010 2.1.0.10rc1
70 * 1.0.10 1 10010 2.1.0.10
71 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
72 * 1.0.11rc1 1 10011 2.1.0.11rc1
73 * 1.0.11 1 10011 2.1.0.11
74 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
75 * 1.0.12rc1 2 10012 2.1.0.12rc1
76 * 1.0.12 2 10012 2.1.0.12
77 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
78 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
79 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
80 * 1.2.0rc1 3 10200 3.1.2.0rc1
81 * 1.2.0 3 10200 3.1.2.0
82 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
83 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
84 * 1.2.1 3 10201 3.1.2.1
85 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
86 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
87 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
88 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
89 * 1.0.13 10 10013 10.so.0.1.0.13
90 * 1.2.2 12 10202 12.so.0.1.2.2
91 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
92 * 1.2.3 12 10203 12.so.0.1.2.3
93 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
94 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
95 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
96 * 1.0.14 10 10014 10.so.0.1.0.14
97 * 1.2.4 13 10204 12.so.0.1.2.4
98 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2
99 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3
100 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3
101 * 1.0.15 10 10015 10.so.0.1.0.15
102 * 1.2.5 13 10205 12.so.0.1.2.5
103 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4
104 * 1.0.16 10 10016 10.so.0.1.0.16
105 * 1.2.6 13 10206 12.so.0.1.2.6
106 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2
107 * 1.0.17rc1 10 10017 10.so.0.1.0.17rc1
108 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1
109 * 1.0.17 10 10017 10.so.0.1.0.17
110 * 1.2.7 13 10207 12.so.0.1.2.7
111 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5
112 * 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5
113 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5
114 * 1.0.18 10 10018 10.so.0.1.0.18
115 * 1.2.8 13 10208 12.so.0.1.2.8
116 * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3
117 * 1.2.9beta4-11 13 10209 12.so.0.9[.0]
118 * 1.2.9rc1 13 10209 12.so.0.9[.0]
119 * 1.2.9 13 10209 12.so.0.9[.0]
120 * 1.2.10beta1-8 13 10210 12.so.0.10[.0]
121 * 1.2.10rc1-3 13 10210 12.so.0.10[.0]
122 * 1.2.10 13 10210 12.so.0.10[.0]
123 * 1.2.11beta1-4 13 10211 12.so.0.11[.0]
124 * 1.0.19rc1-5 10 10019 10.so.0.19[.0]
125 * 1.2.11rc1-5 13 10211 12.so.0.11[.0]
126 * 1.0.19 10 10019 10.so.0.19[.0]
127 * 1.2.11 13 10211 12.so.0.11[.0]
128 * 1.0.20 10 10020 10.so.0.20[.0]
129 * 1.2.12 13 10212 12.so.0.12[.0]
130 * 1.2.13beta1 13 10213 12.so.0.13[.0]
131 * 1.0.21 10 10021 10.so.0.21[.0]
132 * 1.2.13 13 10213 12.so.0.13[.0]
133 * 1.2.14beta1-2 13 10214 12.so.0.14[.0]
134 * 1.0.22rc1 10 10022 10.so.0.22[.0]
135 * 1.2.14rc1 13 10214 12.so.0.14[.0]
136 * 1.0.22 10 10022 10.so.0.22[.0]
137 * 1.2.14 13 10214 12.so.0.14[.0]
138 * 1.2.15beta1-6 13 10215 12.so.0.15[.0]
139 * 1.0.23rc1-5 10 10023 10.so.0.23[.0]
140 * 1.2.15rc1-5 13 10215 12.so.0.15[.0]
141 * 1.0.23 10 10023 10.so.0.23[.0]
142 * 1.2.15 13 10215 12.so.0.15[.0]
143 * 1.2.16beta1-2 13 10216 12.so.0.16[.0]
144 * 1.2.16rc1 13 10216 12.so.0.16[.0]
145 * 1.0.24 10 10024 10.so.0.24[.0]
146 * 1.2.16 13 10216 12.so.0.16[.0]
147 * 1.2.17beta1-2 13 10217 12.so.0.17[.0]
148 * 1.0.25rc1 10 10025 10.so.0.25[.0]
149 * 1.2.17rc1-3 13 10217 12.so.0.17[.0]
150 * 1.0.25 10 10025 10.so.0.25[.0]
151 * 1.2.17 13 10217 12.so.0.17[.0]
152 * 1.0.26 10 10026 10.so.0.26[.0]
153 * 1.2.18 13 10218 12.so.0.18[.0]
154 * 1.2.19beta1-31 13 10219 12.so.0.19[.0]
155 * 1.0.27rc1-6 10 10027 10.so.0.27[.0]
156 * 1.2.19rc1-6 13 10219 12.so.0.19[.0]
157 * 1.0.27 10 10027 10.so.0.27[.0]
158 * 1.2.19 13 10219 12.so.0.19[.0]
159 * 1.2.20beta01-04 13 10220 12.so.0.20[.0]
160 * 1.0.28rc1-6 10 10028 10.so.0.28[.0]
161 * 1.2.20rc1-6 13 10220 12.so.0.20[.0]
162 * 1.0.28 10 10028 10.so.0.28[.0]
163 * 1.2.20 13 10220 12.so.0.20[.0]
164 * 1.2.21beta1-2 13 10221 12.so.0.21[.0]
165 * 1.2.21rc1-3 13 10221 12.so.0.21[.0]
166 * 1.0.29 10 10029 10.so.0.29[.0]
167 * 1.2.21 13 10221 12.so.0.21[.0]
168 * 1.2.22beta1-4 13 10222 12.so.0.22[.0]
169 * 1.0.30rc1 10 10030 10.so.0.30[.0]
170 * 1.2.22rc1 13 10222 12.so.0.22[.0]
171 * 1.0.30 10 10030 10.so.0.30[.0]
172 * 1.2.22 13 10222 12.so.0.22[.0]
173 * 1.2.23beta01-05 13 10223 12.so.0.23[.0]
174 * 1.2.23rc01 13 10223 12.so.0.23[.0]
175 * 1.2.23 13 10223 12.so.0.23[.0]
176 * 1.2.24beta01-02 13 10224 12.so.0.24[.0]
177 * 1.2.24rc01 13 10224 12.so.0.24[.0]
178 * 1.2.24 13 10224 12.so.0.24[.0]
179 * 1.2.25beta01-06 13 10225 12.so.0.25[.0]
180 * 1.2.25rc01-02 13 10225 12.so.0.25[.0]
181 * 1.0.31 10 10031 10.so.0.31[.0]
182 * 1.2.25 13 10225 12.so.0.25[.0]
183 * 1.2.26beta01-06 13 10226 12.so.0.26[.0]
184 * 1.2.26rc01 13 10226 12.so.0.26[.0]
185 * 1.2.26 13 10226 12.so.0.26[.0]
186 * 1.0.32 10 10032 10.so.0.32[.0]
187 * 1.2.27beta01-06 13 10227 12.so.0.27[.0]
188 * 1.2.27rc01 13 10227 12.so.0.27[.0]
189 * 1.0.33 10 10033 10.so.0.33[.0]
190 * 1.2.27 13 10227 12.so.0.27[.0]
191 * 1.0.34 10 10034 10.so.0.34[.0]
192 * 1.2.28 13 10228 12.so.0.28[.0]
193 * 1.2.29beta01-03 13 10229 12.so.0.29[.0]
194 * 1.2.29rc01 13 10229 12.so.0.29[.0]
195 * 1.0.35 10 10035 10.so.0.35[.0]
196 * 1.2.29 13 10229 12.so.0.29[.0]
197 * 1.0.37 10 10037 10.so.0.37[.0]
198 * 1.2.30beta01-04 13 10230 12.so.0.30[.0]
199 * 1.0.38rc01-08 10 10038 10.so.0.38[.0]
200 * 1.2.30rc01-08 13 10230 12.so.0.30[.0]
201 * 1.0.38 10 10038 10.so.0.38[.0]
202 * 1.2.30 13 10230 12.so.0.30[.0]
203 * 1.0.39rc01-03 10 10039 10.so.0.39[.0]
204 * 1.2.31rc01-03 13 10231 12.so.0.31[.0]
205 * 1.0.39 10 10039 10.so.0.39[.0]
206 * 1.2.31 13 10231 12.so.0.31[.0]
207 * 1.2.32beta01-02 13 10232 12.so.0.32[.0]
208 * 1.0.40rc01 10 10040 10.so.0.40[.0]
209 * 1.2.32rc01 13 10232 12.so.0.32[.0]
210 * 1.0.40 10 10040 10.so.0.40[.0]
211 * 1.2.32 13 10232 12.so.0.32[.0]
212 * 1.2.33beta01-02 13 10233 12.so.0.33[.0]
213 * 1.2.33rc01-02 13 10233 12.so.0.33[.0]
214 * 1.0.41rc01 10 10041 10.so.0.41[.0]
215 * 1.2.33 13 10233 12.so.0.33[.0]
216 * 1.0.41 10 10041 10.so.0.41[.0]
217 * 1.2.34beta01-07 13 10234 12.so.0.34[.0]
218 * 1.0.42rc01 10 10042 10.so.0.42[.0]
219 * 1.2.34rc01 13 10234 12.so.0.34[.0]
220 * 1.0.42 10 10042 10.so.0.42[.0]
221 * 1.2.34 13 10234 12.so.0.34[.0]
222 * 1.2.35beta01-03 13 10235 12.so.0.35[.0]
223 * 1.0.43rc01-02 10 10043 10.so.0.43[.0]
224 * 1.2.35rc01-02 13 10235 12.so.0.35[.0]
225 * 1.0.43 10 10043 10.so.0.43[.0]
226 * 1.2.35 13 10235 12.so.0.35[.0]
227 * 1.2.36beta01-05 13 10236 12.so.0.36[.0]
228 * 1.2.36rc01 13 10236 12.so.0.36[.0]
229 * 1.0.44 10 10044 10.so.0.44[.0]
230 * 1.2.36 13 10236 12.so.0.36[.0]
231 * 1.2.37beta01-03 13 10237 12.so.0.37[.0]
232 * 1.2.37rc01 13 10237 12.so.0.37[.0]
233 * 1.2.37 13 10237 12.so.0.37[.0]
234 * 1.2.45 10 10045 12.so.0.45[.0]
235 * 1.0.46 10 10046 10.so.0.46[.0]
236 * 1.2.38beta01 13 10238 12.so.0.38[.0]
237 * 1.2.38rc01-03 13 10238 12.so.0.38[.0]
238 * 1.0.47 10 10047 10.so.0.47[.0]
239 * 1.2.38 13 10238 12.so.0.38[.0]
240 * 1.2.39beta01-05 13 10239 12.so.0.39[.0]
241 * 1.2.39rc01 13 10239 12.so.0.39[.0]
242 * 1.0.48 10 10048 10.so.0.48[.0]
243 * 1.2.39 13 10239 12.so.0.39[.0]
244 *
245 * Henceforth the source version will match the shared-library major
246 * and minor numbers; the shared-library major version number will be
247 * used for changes in backward compatibility, as it is intended. The
248 * PNG_LIBPNG_VER macro, which is not used within libpng but is available
249 * for applications, is an unsigned integer of the form xyyzz corresponding
250 * to the source version x.y.z (leading zeros in y and z). Beta versions
251 * were given the previous public release number plus a letter, until
252 * version 1.0.6j; from then on they were given the upcoming public
253 * release number plus "betaNN" or "rcNN".
254 *
255 * Binary incompatibility exists only when applications make direct access
256 * to the info_ptr or png_ptr members through png.h, and the compiled
257 * application is loaded with a different version of the library.
258 *
259 * DLLNUM will change each time there are forward or backward changes
260 * in binary compatibility (e.g., when a new feature is added).
261 *
262 * See libpng.txt or libpng.3 for more information. The PNG specification
263 * is available as a W3C Recommendation and as an ISO Specification,
264 * <http://www.w3.org/TR/2003/REC-PNG-20031110/
265 */
266
267 /*
268 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
269 *
270 * If you modify libpng you may insert additional notices immediately following
271 * this sentence.
272 *
273 * This code is released under the libpng license.
274 *
275 * libpng versions 1.2.6, August 15, 2004, through 1.2.39, August 13, 2009, are
276 * Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are
277 * distributed according to the same disclaimer and license as libpng-1.2.5
278 * with the following individual added to the list of Contributing Authors:
279 *
280 * Cosmin Truta
281 *
282 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
283 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
284 * distributed according to the same disclaimer and license as libpng-1.0.6
285 * with the following individuals added to the list of Contributing Authors:
286 *
287 * Simon-Pierre Cadieux
288 * Eric S. Raymond
289 * Gilles Vollant
290 *
291 * and with the following additions to the disclaimer:
292 *
293 * There is no warranty against interference with your enjoyment of the
294 * library or against infringement. There is no warranty that our
295 * efforts or the library will fulfill any of your particular purposes
296 * or needs. This library is provided with all faults, and the entire
297 * risk of satisfactory quality, performance, accuracy, and effort is with
298 * the user.
299 *
300 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
301 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
302 * distributed according to the same disclaimer and license as libpng-0.96,
303 * with the following individuals added to the list of Contributing Authors:
304 *
305 * Tom Lane
306 * Glenn Randers-Pehrson
307 * Willem van Schaik
308 *
309 * libpng versions 0.89, June 1996, through 0.96, May 1997, are
310 * Copyright (c) 1996, 1997 Andreas Dilger
311 * Distributed according to the same disclaimer and license as libpng-0.88,
312 * with the following individuals added to the list of Contributing Authors:
313 *
314 * John Bowler
315 * Kevin Bracey
316 * Sam Bushell
317 * Magnus Holmgren
318 * Greg Roelofs
319 * Tom Tanner
320 *
321 * libpng versions 0.5, May 1995, through 0.88, January 1996, are
322 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
323 *
324 * For the purposes of this copyright and license, "Contributing Authors"
325 * is defined as the following set of individuals:
326 *
327 * Andreas Dilger
328 * Dave Martindale
329 * Guy Eric Schalnat
330 * Paul Schmidt
331 * Tim Wegner
332 *
333 * The PNG Reference Library is supplied "AS IS". The Contributing Authors
334 * and Group 42, Inc. disclaim all warranties, expressed or implied,
335 * including, without limitation, the warranties of merchantability and of
336 * fitness for any purpose. The Contributing Authors and Group 42, Inc.
337 * assume no liability for direct, indirect, incidental, special, exemplary,
338 * or consequential damages, which may result from the use of the PNG
339 * Reference Library, even if advised of the possibility of such damage.
340 *
341 * Permission is hereby granted to use, copy, modify, and distribute this
342 * source code, or portions hereof, for any purpose, without fee, subject
343 * to the following restrictions:
344 *
345 * 1. The origin of this source code must not be misrepresented.
346 *
347 * 2. Altered versions must be plainly marked as such and
348 * must not be misrepresented as being the original source.
349 *
350 * 3. This Copyright notice may not be removed or altered from
351 * any source or altered source distribution.
352 *
353 * The Contributing Authors and Group 42, Inc. specifically permit, without
354 * fee, and encourage the use of this source code as a component to
355 * supporting the PNG file format in commercial products. If you use this
356 * source code in a product, acknowledgment is not required but would be
357 * appreciated.
358 */
359
360 /*
361 * A "png_get_copyright" function is available, for convenient use in "about"
362 * boxes and the like:
363 *
364 * printf("%s",png_get_copyright(NULL));
365 *
366 * Also, the PNG logo (in PNG format, of course) is supplied in the
367 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
368 */
369
370 /*
371 * Libpng is OSI Certified Open Source Software. OSI Certified is a
372 * certification mark of the Open Source Initiative.
373 */
374
375 /*
376 * The contributing authors would like to thank all those who helped
377 * with testing, bug fixes, and patience. This wouldn't have been
378 * possible without all of you.
379 *
380 * Thanks to Frank J. T. Wojcik for helping with the documentation.
381 */
382
383 /*
384 * Y2K compliance in libpng:
385 * =========================
386 *
387 * August 13, 2009
388 *
389 * Since the PNG Development group is an ad-hoc body, we can't make
390 * an official declaration.
391 *
392 * This is your unofficial assurance that libpng from version 0.71 and
393 * upward through 1.2.39 are Y2K compliant. It is my belief that earlier
394 * versions were also Y2K compliant.
395 *
396 * Libpng only has three year fields. One is a 2-byte unsigned integer
397 * that will hold years up to 65535. The other two hold the date in text
398 * format, and will hold years up to 9999.
399 *
400 * The integer is
401 * "png_uint_16 year" in png_time_struct.
402 *
403 * The strings are
404 * "png_charp time_buffer" in png_struct and
405 * "near_time_buffer", which is a local character string in png.c.
406 *
407 * There are seven time-related functions:
408 * png.c: png_convert_to_rfc_1123() in png.c
409 * (formerly png_convert_to_rfc_1152() in error)
410 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
411 * png_convert_from_time_t() in pngwrite.c
412 * png_get_tIME() in pngget.c
413 * png_handle_tIME() in pngrutil.c, called in pngread.c
414 * png_set_tIME() in pngset.c
415 * png_write_tIME() in pngwutil.c, called in pngwrite.c
416 *
417 * All handle dates properly in a Y2K environment. The
418 * png_convert_from_time_t() function calls gmtime() to convert from system
419 * clock time, which returns (year - 1900), which we properly convert to
420 * the full 4-digit year. There is a possibility that applications using
421 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
422 * function, or that they are incorrectly passing only a 2-digit year
423 * instead of "year - 1900" into the png_convert_from_struct_tm() function,
424 * but this is not under our control. The libpng documentation has always
425 * stated that it works with 4-digit years, and the APIs have been
426 * documented as such.
427 *
428 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
429 * integer to hold the year, and can hold years as large as 65535.
430 *
431 * zlib, upon which libpng depends, is also Y2K compliant. It contains
432 * no date-related code.
433 *
434 * Glenn Randers-Pehrson
435 * libpng maintainer
436 * PNG Development Group
437 */
438
439 #ifndef PNG_H
440 #define PNG_H
441
442 /* This is not the place to learn how to use libpng. The file libpng.txt
443 * describes how to use libpng, and the file example.c summarizes it
444 * with some code on which to build. This file is useful for looking
445 * at the actual function definitions and structure components.
446 */
447
448 /* Version information for png.h - this should match the version in png.c */
449 #define PNG_LIBPNG_VER_STRING "1.2.39"
450 #define PNG_HEADER_VERSION_STRING \
451 " libpng version 1.2.39 - August 13, 2009\n"
452
453 #define PNG_LIBPNG_VER_SONUM 0
454 #define PNG_LIBPNG_VER_DLLNUM 13
455
456 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
457 #define PNG_LIBPNG_VER_MAJOR 1
458 #define PNG_LIBPNG_VER_MINOR 2
459 #define PNG_LIBPNG_VER_RELEASE 39
460 /* This should match the numeric part of the final component of
461 * PNG_LIBPNG_VER_STRING, omitting any leading zero:
462 */
463
464 #define PNG_LIBPNG_VER_BUILD 0
465
466 /* Release Status */
467 #define PNG_LIBPNG_BUILD_ALPHA 1
468 #define PNG_LIBPNG_BUILD_BETA 2
469 #define PNG_LIBPNG_BUILD_RC 3
470 #define PNG_LIBPNG_BUILD_STABLE 4
471 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
472
473 /* Release-Specific Flags */
474 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
475 PNG_LIBPNG_BUILD_STABLE only */
476 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
477 PNG_LIBPNG_BUILD_SPECIAL */
478 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
479 PNG_LIBPNG_BUILD_PRIVATE */
480
481 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
482
483 /* Careful here. At one time, Guy wanted to use 082, but that would be octal.
484 * We must not include leading zeros.
485 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
486 * version 1.0.0 was mis-numbered 100 instead of 10000). From
487 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release
488 */
489 #define PNG_LIBPNG_VER 10239 /* 1.2.39 */
490
491 #ifndef PNG_VERSION_INFO_ONLY
492 /* include the compression library's header */
493 #include "zlib.h"
494 #endif
495
496 /* include all user configurable info, including optional assembler routines */
497 #include "pngconf.h"
498
499 /*
500 * Added at libpng-1.2.8 */
501 /* Ref MSDN: Private as priority over Special
502 * VS_FF_PRIVATEBUILD File *was not* built using standard release
503 * procedures. If this value is given, the StringFileInfo block must
504 * contain a PrivateBuild string.
505 *
506 * VS_FF_SPECIALBUILD File *was* built by the original company using
507 * standard release procedures but is a variation of the standard
508 * file of the same version number. If this value is given, the
509 * StringFileInfo block must contain a SpecialBuild string.
510 */
511
512 #if defined(PNG_USER_PRIVATEBUILD)
513 # define PNG_LIBPNG_BUILD_TYPE \
514 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
515 #else
516 # if defined(PNG_LIBPNG_SPECIALBUILD)
517 # define PNG_LIBPNG_BUILD_TYPE \
518 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
519 # else
520 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
521 # endif
522 #endif
523
524 #ifndef PNG_VERSION_INFO_ONLY
525
526 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
527 #ifdef __cplusplus
528 extern "C" {
529 #endif /* __cplusplus */
530
531 /* This file is arranged in several sections. The first section contains
532 * structure and type definitions. The second section contains the external
533 * library functions, while the third has the internal library functions,
534 * which applications aren't expected to use directly.
535 */
536
537 #ifndef PNG_NO_TYPECAST_NULL
538 #define int_p_NULL (int *)NULL
539 #define png_bytep_NULL (png_bytep)NULL
540 #define png_bytepp_NULL (png_bytepp)NULL
541 #define png_doublep_NULL (png_doublep)NULL
542 #define png_error_ptr_NULL (png_error_ptr)NULL
543 #define png_flush_ptr_NULL (png_flush_ptr)NULL
544 #define png_free_ptr_NULL (png_free_ptr)NULL
545 #define png_infopp_NULL (png_infopp)NULL
546 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL
547 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL
548 #define png_rw_ptr_NULL (png_rw_ptr)NULL
549 #define png_structp_NULL (png_structp)NULL
550 #define png_uint_16p_NULL (png_uint_16p)NULL
551 #define png_voidp_NULL (png_voidp)NULL
552 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL
553 #else
554 #define int_p_NULL NULL
555 #define png_bytep_NULL NULL
556 #define png_bytepp_NULL NULL
557 #define png_doublep_NULL NULL
558 #define png_error_ptr_NULL NULL
559 #define png_flush_ptr_NULL NULL
560 #define png_free_ptr_NULL NULL
561 #define png_infopp_NULL NULL
562 #define png_malloc_ptr_NULL NULL
563 #define png_read_status_ptr_NULL NULL
564 #define png_rw_ptr_NULL NULL
565 #define png_structp_NULL NULL
566 #define png_uint_16p_NULL NULL
567 #define png_voidp_NULL NULL
568 #define png_write_status_ptr_NULL NULL
569 #endif
570
571 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
572 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
573 /* Version information for C files, stored in png.c. This had better match
574 * the version above.
575 */
576 #ifdef PNG_USE_GLOBAL_ARRAYS
577 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
578 /* need room for 99.99.99beta99z */
579 #else
580 #define png_libpng_ver png_get_header_ver(NULL)
581 #endif
582
583 #ifdef PNG_USE_GLOBAL_ARRAYS
584 /* This was removed in version 1.0.5c */
585 /* Structures to facilitate easy interlacing. See png.c for more details */
586 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
587 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
588 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
589 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
590 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
591 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
592 /* This isn't currently used. If you need it, see png.c for more details.
593 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
594 */
595 #endif
596
597 #endif /* PNG_NO_EXTERN */
598
599 /* Three color definitions. The order of the red, green, and blue, (and the
600 * exact size) is not important, although the size of the fields need to
601 * be png_byte or png_uint_16 (as defined below).
602 */
603 typedef struct png_color_struct
604 {
605 png_byte red;
606 png_byte green;
607 png_byte blue;
608 } png_color;
609 typedef png_color FAR * png_colorp;
610 typedef png_color FAR * FAR * png_colorpp;
611
612 typedef struct png_color_16_struct
613 {
614 png_byte index; /* used for palette files */
615 png_uint_16 red; /* for use in red green blue files */
616 png_uint_16 green;
617 png_uint_16 blue;
618 png_uint_16 gray; /* for use in grayscale files */
619 } png_color_16;
620 typedef png_color_16 FAR * png_color_16p;
621 typedef png_color_16 FAR * FAR * png_color_16pp;
622
623 typedef struct png_color_8_struct
624 {
625 png_byte red; /* for use in red green blue files */
626 png_byte green;
627 png_byte blue;
628 png_byte gray; /* for use in grayscale files */
629 png_byte alpha; /* for alpha channel files */
630 } png_color_8;
631 typedef png_color_8 FAR * png_color_8p;
632 typedef png_color_8 FAR * FAR * png_color_8pp;
633
634 /*
635 * The following two structures are used for the in-core representation
636 * of sPLT chunks.
637 */
638 typedef struct png_sPLT_entry_struct
639 {
640 png_uint_16 red;
641 png_uint_16 green;
642 png_uint_16 blue;
643 png_uint_16 alpha;
644 png_uint_16 frequency;
645 } png_sPLT_entry;
646 typedef png_sPLT_entry FAR * png_sPLT_entryp;
647 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
648
649 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples
650 * occupy the LSB of their respective members, and the MSB of each member
651 * is zero-filled. The frequency member always occupies the full 16 bits.
652 */
653
654 typedef struct png_sPLT_struct
655 {
656 png_charp name; /* palette name */
657 png_byte depth; /* depth of palette samples */
658 png_sPLT_entryp entries; /* palette entries */
659 png_int_32 nentries; /* number of palette entries */
660 } png_sPLT_t;
661 typedef png_sPLT_t FAR * png_sPLT_tp;
662 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
663
664 #ifdef PNG_TEXT_SUPPORTED
665 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
666 * and whether that contents is compressed or not. The "key" field
667 * points to a regular zero-terminated C string. The "text", "lang", and
668 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
669 * However, the * structure returned by png_get_text() will always contain
670 * regular zero-terminated C strings (possibly empty), never NULL pointers,
671 * so they can be safely used in printf() and other string-handling functions.
672 */
673 typedef struct png_text_struct
674 {
675 int compression; /* compression value:
676 -1: tEXt, none
677 0: zTXt, deflate
678 1: iTXt, none
679 2: iTXt, deflate */
680 png_charp key; /* keyword, 1-79 character description of "text" */
681 png_charp text; /* comment, may be an empty string (ie "")
682 or a NULL pointer */
683 png_size_t text_length; /* length of the text string */
684 #ifdef PNG_iTXt_SUPPORTED
685 png_size_t itxt_length; /* length of the itxt string */
686 png_charp lang; /* language code, 0-79 characters
687 or a NULL pointer */
688 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
689 chars or a NULL pointer */
690 #endif
691 } png_text;
692 typedef png_text FAR * png_textp;
693 typedef png_text FAR * FAR * png_textpp;
694 #endif
695
696 /* Supported compression types for text in PNG files (tEXt, and zTXt).
697 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed.
698 */
699 #define PNG_TEXT_COMPRESSION_NONE_WR -3
700 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
701 #define PNG_TEXT_COMPRESSION_NONE -1
702 #define PNG_TEXT_COMPRESSION_zTXt 0
703 #define PNG_ITXT_COMPRESSION_NONE 1
704 #define PNG_ITXT_COMPRESSION_zTXt 2
705 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
706
707 /* png_time is a way to hold the time in an machine independent way.
708 * Two conversions are provided, both from time_t and struct tm. There
709 * is no portable way to convert to either of these structures, as far
710 * as I know. If you know of a portable way, send it to me. As a side
711 * note - PNG has always been Year 2000 compliant!
712 */
713 typedef struct png_time_struct
714 {
715 png_uint_16 year; /* full year, as in, 1995 */
716 png_byte month; /* month of year, 1 - 12 */
717 png_byte day; /* day of month, 1 - 31 */
718 png_byte hour; /* hour of day, 0 - 23 */
719 png_byte minute; /* minute of hour, 0 - 59 */
720 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
721 } png_time;
722 typedef png_time FAR * png_timep;
723 typedef png_time FAR * FAR * png_timepp;
724
725 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
726 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
727 /* png_unknown_chunk is a structure to hold queued chunks for which there is
728 * no specific support. The idea is that we can use this to queue
729 * up private chunks for output even though the library doesn't actually
730 * know about their semantics.
731 */
732 #define PNG_CHUNK_NAME_LENGTH 5
733 typedef struct png_unknown_chunk_t
734 {
735 png_byte name[PNG_CHUNK_NAME_LENGTH];
736 png_byte *data;
737 png_size_t size;
738
739 /* libpng-using applications should NOT directly modify this byte. */
740 png_byte location; /* mode of operation at read time */
741 }
742 png_unknown_chunk;
743 typedef png_unknown_chunk FAR * png_unknown_chunkp;
744 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
745 #endif
746
747 /* png_info is a structure that holds the information in a PNG file so
748 * that the application can find out the characteristics of the image.
749 * If you are reading the file, this structure will tell you what is
750 * in the PNG file. If you are writing the file, fill in the information
751 * you want to put into the PNG file, then call png_write_info().
752 * The names chosen should be very close to the PNG specification, so
753 * consult that document for information about the meaning of each field.
754 *
755 * With libpng < 0.95, it was only possible to directly set and read the
756 * the values in the png_info_struct, which meant that the contents and
757 * order of the values had to remain fixed. With libpng 0.95 and later,
758 * however, there are now functions that abstract the contents of
759 * png_info_struct from the application, so this makes it easier to use
760 * libpng with dynamic libraries, and even makes it possible to use
761 * libraries that don't have all of the libpng ancillary chunk-handing
762 * functionality.
763 *
764 * In any case, the order of the parameters in png_info_struct should NOT
765 * be changed for as long as possible to keep compatibility with applications
766 * that use the old direct-access method with png_info_struct.
767 *
768 * The following members may have allocated storage attached that should be
769 * cleaned up before the structure is discarded: palette, trans, text,
770 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
771 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
772 * are automatically freed when the info structure is deallocated, if they were
773 * allocated internally by libpng. This behavior can be changed by means
774 * of the png_data_freer() function.
775 *
776 * More allocation details: all the chunk-reading functions that
777 * change these members go through the corresponding png_set_*
778 * functions. A function to clear these members is available: see
779 * png_free_data(). The png_set_* functions do not depend on being
780 * able to point info structure members to any of the storage they are
781 * passed (they make their own copies), EXCEPT that the png_set_text
782 * functions use the same storage passed to them in the text_ptr or
783 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
784 * functions do not make their own copies.
785 */
786 typedef struct png_info_struct
787 {
788 /* the following are necessary for every PNG file */
789 png_uint_32 width; /* width of image in pixels (from IHDR) */
790 png_uint_32 height; /* height of image in pixels (from IHDR) */
791 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
792 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */
793 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
794 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
795 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
796 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
797 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
798 /* The following three should have been named *_method not *_type */
799 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
800 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
801 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
802
803 /* The following is informational only on read, and not used on writes. */
804 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
805 png_byte pixel_depth; /* number of bits per pixel */
806 png_byte spare_byte; /* to align the data, and for future use */
807 png_byte signature[8]; /* magic bytes read by libpng from start of file */
808
809 /* The rest of the data is optional. If you are reading, check the
810 * valid field to see if the information in these are valid. If you
811 * are writing, set the valid field to those chunks you want written,
812 * and initialize the appropriate fields below.
813 */
814
815 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
816 /* The gAMA chunk describes the gamma characteristics of the system
817 * on which the image was created, normally in the range [1.0, 2.5].
818 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
819 */
820 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
821 #endif
822
823 #if defined(PNG_sRGB_SUPPORTED)
824 /* GR-P, 0.96a */
825 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
826 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
827 #endif
828
829 #if defined(PNG_TEXT_SUPPORTED)
830 /* The tEXt, and zTXt chunks contain human-readable textual data in
831 * uncompressed, compressed, and optionally compressed forms, respectively.
832 * The data in "text" is an array of pointers to uncompressed,
833 * null-terminated C strings. Each chunk has a keyword that describes the
834 * textual data contained in that chunk. Keywords are not required to be
835 * unique, and the text string may be empty. Any number of text chunks may
836 * be in an image.
837 */
838 int num_text; /* number of comments read/to write */
839 int max_text; /* current size of text array */
840 png_textp text; /* array of comments read/to write */
841 #endif /* PNG_TEXT_SUPPORTED */
842
843 #if defined(PNG_tIME_SUPPORTED)
844 /* The tIME chunk holds the last time the displayed image data was
845 * modified. See the png_time struct for the contents of this struct.
846 */
847 png_time mod_time;
848 #endif
849
850 #if defined(PNG_sBIT_SUPPORTED)
851 /* The sBIT chunk specifies the number of significant high-order bits
852 * in the pixel data. Values are in the range [1, bit_depth], and are
853 * only specified for the channels in the pixel data. The contents of
854 * the low-order bits is not specified. Data is valid if
855 * (valid & PNG_INFO_sBIT) is non-zero.
856 */
857 png_color_8 sig_bit; /* significant bits in color channels */
858 #endif
859
860 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
861 defined(PNG_READ_BACKGROUND_SUPPORTED)
862 /* The tRNS chunk supplies transparency data for paletted images and
863 * other image types that don't need a full alpha channel. There are
864 * "num_trans" transparency values for a paletted image, stored in the
865 * same order as the palette colors, starting from index 0. Values
866 * for the data are in the range [0, 255], ranging from fully transparent
867 * to fully opaque, respectively. For non-paletted images, there is a
868 * single color specified that should be treated as fully transparent.
869 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
870 */
871 png_bytep trans; /* transparent values for paletted image */
872 png_color_16 trans_values; /* transparent color for non-palette image */
873 #endif
874
875 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
876 /* The bKGD chunk gives the suggested image background color if the
877 * display program does not have its own background color and the image
878 * is needs to composited onto a background before display. The colors
879 * in "background" are normally in the same color space/depth as the
880 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
881 */
882 png_color_16 background;
883 #endif
884
885 #if defined(PNG_oFFs_SUPPORTED)
886 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
887 * and downwards from the top-left corner of the display, page, or other
888 * application-specific co-ordinate space. See the PNG_OFFSET_ defines
889 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
890 */
891 png_int_32 x_offset; /* x offset on page */
892 png_int_32 y_offset; /* y offset on page */
893 png_byte offset_unit_type; /* offset units type */
894 #endif
895
896 #if defined(PNG_pHYs_SUPPORTED)
897 /* The pHYs chunk gives the physical pixel density of the image for
898 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
899 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
900 */
901 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
902 png_uint_32 y_pixels_per_unit; /* vertical pixel density */
903 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
904 #endif
905
906 #if defined(PNG_hIST_SUPPORTED)
907 /* The hIST chunk contains the relative frequency or importance of the
908 * various palette entries, so that a viewer can intelligently select a
909 * reduced-color palette, if required. Data is an array of "num_palette"
910 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
911 * is non-zero.
912 */
913 png_uint_16p hist;
914 #endif
915
916 #ifdef PNG_cHRM_SUPPORTED
917 /* The cHRM chunk describes the CIE color characteristics of the monitor
918 * on which the PNG was created. This data allows the viewer to do gamut
919 * mapping of the input image to ensure that the viewer sees the same
920 * colors in the image as the creator. Values are in the range
921 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
922 */
923 #ifdef PNG_FLOATING_POINT_SUPPORTED
924 float x_white;
925 float y_white;
926 float x_red;
927 float y_red;
928 float x_green;
929 float y_green;
930 float x_blue;
931 float y_blue;
932 #endif
933 #endif
934
935 #if defined(PNG_pCAL_SUPPORTED)
936 /* The pCAL chunk describes a transformation between the stored pixel
937 * values and original physical data values used to create the image.
938 * The integer range [0, 2^bit_depth - 1] maps to the floating-point
939 * range given by [pcal_X0, pcal_X1], and are further transformed by a
940 * (possibly non-linear) transformation function given by "pcal_type"
941 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
942 * defines below, and the PNG-Group's PNG extensions document for a
943 * complete description of the transformations and how they should be
944 * implemented, and for a description of the ASCII parameter strings.
945 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
946 */
947 png_charp pcal_purpose; /* pCAL chunk description string */
948 png_int_32 pcal_X0; /* minimum value */
949 png_int_32 pcal_X1; /* maximum value */
950 png_charp pcal_units; /* Latin-1 string giving physical units */
951 png_charpp pcal_params; /* ASCII strings containing parameter values */
952 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
953 png_byte pcal_nparams; /* number of parameters given in pcal_params */
954 #endif
955
956 /* New members added in libpng-1.0.6 */
957 #ifdef PNG_FREE_ME_SUPPORTED
958 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
959 #endif
960
961 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
962 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
963 /* Storage for unknown chunks that the library doesn't recognize. */
964 png_unknown_chunkp unknown_chunks;
965 png_size_t unknown_chunks_num;
966 #endif
967
968 #if defined(PNG_iCCP_SUPPORTED)
969 /* iCCP chunk data. */
970 png_charp iccp_name; /* profile name */
971 png_charp iccp_profile; /* International Color Consortium profile data */
972 /* Note to maintainer: should be png_bytep */
973 png_uint_32 iccp_proflen; /* ICC profile data length */
974 png_byte iccp_compression; /* Always zero */
975 #endif
976
977 #if defined(PNG_sPLT_SUPPORTED)
978 /* Data on sPLT chunks (there may be more than one). */
979 png_sPLT_tp splt_palettes;
980 png_uint_32 splt_palettes_num;
981 #endif
982
983 #if defined(PNG_sCAL_SUPPORTED)
984 /* The sCAL chunk describes the actual physical dimensions of the
985 * subject matter of the graphic. The chunk contains a unit specification
986 * a byte value, and two ASCII strings representing floating-point
987 * values. The values are width and height corresponsing to one pixel
988 * in the image. This external representation is converted to double
989 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
990 */
991 png_byte scal_unit; /* unit of physical scale */
992 #ifdef PNG_FLOATING_POINT_SUPPORTED
993 double scal_pixel_width; /* width of one pixel */
994 double scal_pixel_height; /* height of one pixel */
995 #endif
996 #ifdef PNG_FIXED_POINT_SUPPORTED
997 png_charp scal_s_width; /* string containing height */
998 png_charp scal_s_height; /* string containing width */
999 #endif
1000 #endif
1001
1002 #if defined(PNG_INFO_IMAGE_SUPPORTED)
1003 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
1004 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
1005 png_bytepp row_pointers; /* the image bits */
1006 #endif
1007
1008 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
1009 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
1010 #endif
1011
1012 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
1013 png_fixed_point int_x_white;
1014 png_fixed_point int_y_white;
1015 png_fixed_point int_x_red;
1016 png_fixed_point int_y_red;
1017 png_fixed_point int_x_green;
1018 png_fixed_point int_y_green;
1019 png_fixed_point int_x_blue;
1020 png_fixed_point int_y_blue;
1021 #endif
1022
1023 } png_info;
1024
1025 typedef png_info FAR * png_infop;
1026 typedef png_info FAR * FAR * png_infopp;
1027
1028 /* Maximum positive integer used in PNG is (2^31)-1 */
1029 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
1030 #define PNG_UINT_32_MAX ((png_uint_32)(-1))
1031 #define PNG_SIZE_MAX ((png_size_t)(-1))
1032 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1033 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
1034 #define PNG_MAX_UINT PNG_UINT_31_MAX
1035 #endif
1036
1037 /* These describe the color_type field in png_info. */
1038 /* color type masks */
1039 #define PNG_COLOR_MASK_PALETTE 1
1040 #define PNG_COLOR_MASK_COLOR 2
1041 #define PNG_COLOR_MASK_ALPHA 4
1042
1043 /* color types. Note that not all combinations are legal */
1044 #define PNG_COLOR_TYPE_GRAY 0
1045 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
1046 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
1047 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
1048 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
1049 /* aliases */
1050 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
1051 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
1052
1053 /* This is for compression type. PNG 1.0-1.2 only define the single type. */
1054 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
1055 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
1056
1057 /* This is for filter type. PNG 1.0-1.2 only define the single type. */
1058 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
1059 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
1060 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
1061
1062 /* These are for the interlacing type. These values should NOT be changed. */
1063 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
1064 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
1065 #define PNG_INTERLACE_LAST 2 /* Not a valid value */
1066
1067 /* These are for the oFFs chunk. These values should NOT be changed. */
1068 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
1069 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
1070 #define PNG_OFFSET_LAST 2 /* Not a valid value */
1071
1072 /* These are for the pCAL chunk. These values should NOT be changed. */
1073 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */
1074 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
1075 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
1076 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
1077 #define PNG_EQUATION_LAST 4 /* Not a valid value */
1078
1079 /* These are for the sCAL chunk. These values should NOT be changed. */
1080 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
1081 #define PNG_SCALE_METER 1 /* meters per pixel */
1082 #define PNG_SCALE_RADIAN 2 /* radians per pixel */
1083 #define PNG_SCALE_LAST 3 /* Not a valid value */
1084
1085 /* These are for the pHYs chunk. These values should NOT be changed. */
1086 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
1087 #define PNG_RESOLUTION_METER 1 /* pixels/meter */
1088 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */
1089
1090 /* These are for the sRGB chunk. These values should NOT be changed. */
1091 #define PNG_sRGB_INTENT_PERCEPTUAL 0
1092 #define PNG_sRGB_INTENT_RELATIVE 1
1093 #define PNG_sRGB_INTENT_SATURATION 2
1094 #define PNG_sRGB_INTENT_ABSOLUTE 3
1095 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
1096
1097 /* This is for text chunks */
1098 #define PNG_KEYWORD_MAX_LENGTH 79
1099
1100 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */
1101 #define PNG_MAX_PALETTE_LENGTH 256
1102
1103 /* These determine if an ancillary chunk's data has been successfully read
1104 * from the PNG header, or if the application has filled in the corresponding
1105 * data in the info_struct to be written into the output file. The values
1106 * of the PNG_INFO_<chunk> defines should NOT be changed.
1107 */
1108 #define PNG_INFO_gAMA 0x0001
1109 #define PNG_INFO_sBIT 0x0002
1110 #define PNG_INFO_cHRM 0x0004
1111 #define PNG_INFO_PLTE 0x0008
1112 #define PNG_INFO_tRNS 0x0010
1113 #define PNG_INFO_bKGD 0x0020
1114 #define PNG_INFO_hIST 0x0040
1115 #define PNG_INFO_pHYs 0x0080
1116 #define PNG_INFO_oFFs 0x0100
1117 #define PNG_INFO_tIME 0x0200
1118 #define PNG_INFO_pCAL 0x0400
1119 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
1120 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
1121 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
1122 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
1123 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
1124
1125 /* This is used for the transformation routines, as some of them
1126 * change these values for the row. It also should enable using
1127 * the routines for other purposes.
1128 */
1129 typedef struct png_row_info_struct
1130 {
1131 png_uint_32 width; /* width of row */
1132 png_uint_32 rowbytes; /* number of bytes in row */
1133 png_byte color_type; /* color type of row */
1134 png_byte bit_depth; /* bit depth of row */
1135 png_byte channels; /* number of channels (1, 2, 3, or 4) */
1136 png_byte pixel_depth; /* bits per pixel (depth * channels) */
1137 } png_row_info;
1138
1139 typedef png_row_info FAR * png_row_infop;
1140 typedef png_row_info FAR * FAR * png_row_infopp;
1141
1142 /* These are the function types for the I/O functions and for the functions
1143 * that allow the user to override the default I/O functions with his or her
1144 * own. The png_error_ptr type should match that of user-supplied warning
1145 * and error functions, while the png_rw_ptr type should match that of the
1146 * user read/write data functions.
1147 */
1148 typedef struct png_struct_def png_struct;
1149 typedef png_struct FAR * png_structp;
1150
1151 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
1152 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
1153 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
1154 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
1155 int));
1156 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
1157 int));
1158
1159 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1160 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
1161 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
1162 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
1163 png_uint_32, int));
1164 #endif
1165
1166 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1167 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1168 defined(PNG_LEGACY_SUPPORTED)
1169 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
1170 png_row_infop, png_bytep));
1171 #endif
1172
1173 #if defined(PNG_USER_CHUNKS_SUPPORTED)
1174 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
1175 #endif
1176 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1177 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
1178 #endif
1179
1180 /* Transform masks for the high-level interface */
1181 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
1182 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
1183 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
1184 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
1185 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
1186 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
1187 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
1188 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
1189 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */
1190 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
1191 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
1192 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
1193 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only, deprecated */
1194 /* Added to libpng-1.2.34 */
1195 #define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* WRITE only */
1196 #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* WRITE only */
1197
1198 /* Flags for MNG supported features */
1199 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01
1200 #define PNG_FLAG_MNG_FILTER_64 0x04
1201 #define PNG_ALL_MNG_FEATURES 0x05
1202
1203 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
1204 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
1205
1206 /* The structure that holds the information to read and write PNG files.
1207 * The only people who need to care about what is inside of this are the
1208 * people who will be modifying the library for their own special needs.
1209 * It should NOT be accessed directly by an application, except to store
1210 * the jmp_buf.
1211 */
1212
1213 struct png_struct_def
1214 {
1215 #ifdef PNG_SETJMP_SUPPORTED
1216 jmp_buf jmpbuf; /* used in png_error */
1217 #endif
1218 png_error_ptr error_fn; /* function for printing errors and aborting */
1219 png_error_ptr warning_fn; /* function for printing warnings */
1220 png_voidp error_ptr; /* user supplied struct for error functions */
1221 png_rw_ptr write_data_fn; /* function for writing output data */
1222 png_rw_ptr read_data_fn; /* function for reading input data */
1223 png_voidp io_ptr; /* ptr to application struct for I/O functions */
1224
1225 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
1226 png_user_transform_ptr read_user_transform_fn; /* user read transform */
1227 #endif
1228
1229 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1230 png_user_transform_ptr write_user_transform_fn; /* user write transform */
1231 #endif
1232
1233 /* These were added in libpng-1.0.2 */
1234 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
1235 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1236 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1237 png_voidp user_transform_ptr; /* user supplied struct for user transform */
1238 png_byte user_transform_depth; /* bit depth of user transformed pixels */
1239 png_byte user_transform_channels; /* channels in user transformed pixels */
1240 #endif
1241 #endif
1242
1243 png_uint_32 mode; /* tells us where we are in the PNG file */
1244 png_uint_32 flags; /* flags indicating various things to libpng */
1245 png_uint_32 transformations; /* which transformations to perform */
1246
1247 z_stream zstream; /* pointer to decompression structure (below) */
1248 png_bytep zbuf; /* buffer for zlib */
1249 png_size_t zbuf_size; /* size of zbuf */
1250 int zlib_level; /* holds zlib compression level */
1251 int zlib_method; /* holds zlib compression method */
1252 int zlib_window_bits; /* holds zlib compression window bits */
1253 int zlib_mem_level; /* holds zlib compression memory level */
1254 int zlib_strategy; /* holds zlib compression strategy */
1255
1256 png_uint_32 width; /* width of image in pixels */
1257 png_uint_32 height; /* height of image in pixels */
1258 png_uint_32 num_rows; /* number of rows in current pass */
1259 png_uint_32 usr_width; /* width of row at start of write */
1260 png_uint_32 rowbytes; /* size of row in bytes */
1261 png_uint_32 irowbytes; /* size of current interlaced row in bytes */
1262 png_uint_32 iwidth; /* width of current interlaced row in pixels */
1263 png_uint_32 row_number; /* current row in interlace pass */
1264 png_bytep prev_row; /* buffer to save previous (unfiltered) row */
1265 png_bytep row_buf; /* buffer to save current (unfiltered) row */
1266 #ifndef PNG_NO_WRITE_FILTER
1267 png_bytep sub_row; /* buffer to save "sub" row when filtering */
1268 png_bytep up_row; /* buffer to save "up" row when filtering */
1269 png_bytep avg_row; /* buffer to save "avg" row when filtering */
1270 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
1271 #endif
1272 png_row_info row_info; /* used for transformation routines */
1273
1274 png_uint_32 idat_size; /* current IDAT size for read */
1275 png_uint_32 crc; /* current chunk CRC value */
1276 png_colorp palette; /* palette from the input file */
1277 png_uint_16 num_palette; /* number of color entries in palette */
1278 png_uint_16 num_trans; /* number of transparency values */
1279 png_byte chunk_name[5]; /* null-terminated name of current chunk */
1280 png_byte compression; /* file compression type (always 0) */
1281 png_byte filter; /* file filter type (always 0) */
1282 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
1283 png_byte pass; /* current interlace pass (0 - 6) */
1284 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
1285 png_byte color_type; /* color type of file */
1286 png_byte bit_depth; /* bit depth of file */
1287 png_byte usr_bit_depth; /* bit depth of users row */
1288 png_byte pixel_depth; /* number of bits per pixel */
1289 png_byte channels; /* number of channels in file */
1290 png_byte usr_channels; /* channels at start of write */
1291 png_byte sig_bytes; /* magic bytes read/written from start of file */
1292
1293 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1294 #ifdef PNG_LEGACY_SUPPORTED
1295 png_byte filler; /* filler byte for pixel expansion */
1296 #else
1297 png_uint_16 filler; /* filler bytes for pixel expansion */
1298 #endif
1299 #endif
1300
1301 #if defined(PNG_bKGD_SUPPORTED)
1302 png_byte background_gamma_type;
1303 # ifdef PNG_FLOATING_POINT_SUPPORTED
1304 float background_gamma;
1305 # endif
1306 png_color_16 background; /* background color in screen gamma space */
1307 #if defined(PNG_READ_GAMMA_SUPPORTED)
1308 png_color_16 background_1; /* background normalized to gamma 1.0 */
1309 #endif
1310 #endif /* PNG_bKGD_SUPPORTED */
1311
1312 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
1313 png_flush_ptr output_flush_fn; /* Function for flushing output */
1314 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
1315 png_uint_32 flush_rows; /* number of rows written since last flush */
1316 #endif
1317
1318 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1319 int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
1320 #ifdef PNG_FLOATING_POINT_SUPPORTED
1321 float gamma; /* file gamma value */
1322 float screen_gamma; /* screen gamma value (display_exponent) */
1323 #endif
1324 #endif
1325
1326 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1327 png_bytep gamma_table; /* gamma table for 8-bit depth files */
1328 png_bytep gamma_from_1; /* converts from 1.0 to screen */
1329 png_bytep gamma_to_1; /* converts from file to 1.0 */
1330 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
1331 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
1332 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
1333 #endif
1334
1335 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
1336 png_color_8 sig_bit; /* significant bits in each available channel */
1337 #endif
1338
1339 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1340 png_color_8 shift; /* shift for significant bit tranformation */
1341 #endif
1342
1343 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
1344 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1345 png_bytep trans; /* transparency values for paletted files */
1346 png_color_16 trans_values; /* transparency values for non-paletted files */
1347 #endif
1348
1349 png_read_status_ptr read_row_fn; /* called after each row is decoded */
1350 png_write_status_ptr write_row_fn; /* called after each row is encoded */
1351 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1352 png_progressive_info_ptr info_fn; /* called after header data fully read */
1353 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */
1354 png_progressive_end_ptr end_fn; /* called after image is complete */
1355 png_bytep save_buffer_ptr; /* current location in save_buffer */
1356 png_bytep save_buffer; /* buffer for previously read data */
1357 png_bytep current_buffer_ptr; /* current location in current_buffer */
1358 png_bytep current_buffer; /* buffer for recently used data */
1359 png_uint_32 push_length; /* size of current input chunk */
1360 png_uint_32 skip_length; /* bytes to skip in input data */
1361 png_size_t save_buffer_size; /* amount of data now in save_buffer */
1362 png_size_t save_buffer_max; /* total size of save_buffer */
1363 png_size_t buffer_size; /* total amount of available input data */
1364 png_size_t current_buffer_size; /* amount of data now in current_buffer */
1365 int process_mode; /* what push library is currently doing */
1366 int cur_palette; /* current push library palette index */
1367
1368 # if defined(PNG_TEXT_SUPPORTED)
1369 png_size_t current_text_size; /* current size of text input data */
1370 png_size_t current_text_left; /* how much text left to read in input */
1371 png_charp current_text; /* current text chunk buffer */
1372 png_charp current_text_ptr; /* current location in current_text */
1373 # endif /* PNG_TEXT_SUPPORTED */
1374 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1375
1376 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
1377 /* for the Borland special 64K segment handler */
1378 png_bytepp offset_table_ptr;
1379 png_bytep offset_table;
1380 png_uint_16 offset_table_number;
1381 png_uint_16 offset_table_count;
1382 png_uint_16 offset_table_count_free;
1383 #endif
1384
1385 #if defined(PNG_READ_DITHER_SUPPORTED)
1386 png_bytep palette_lookup; /* lookup table for dithering */
1387 png_bytep dither_index; /* index translation for palette files */
1388 #endif
1389
1390 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
1391 png_uint_16p hist; /* histogram */
1392 #endif
1393
1394 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
1395 png_byte heuristic_method; /* heuristic for row filter selection */
1396 png_byte num_prev_filters; /* number of weights for previous rows */
1397 png_bytep prev_filters; /* filter type(s) of previous row(s) */
1398 png_uint_16p filter_weights; /* weight(s) for previous line(s) */
1399 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
1400 png_uint_16p filter_costs; /* relative filter calculation cost */
1401 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
1402 #endif
1403
1404 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1405 png_charp time_buffer; /* String to hold RFC 1123 time text */
1406 #endif
1407
1408 /* New members added in libpng-1.0.6 */
1409
1410 #ifdef PNG_FREE_ME_SUPPORTED
1411 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
1412 #endif
1413
1414 #if defined(PNG_USER_CHUNKS_SUPPORTED)
1415 png_voidp user_chunk_ptr;
1416 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
1417 #endif
1418
1419 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1420 int num_chunk_list;
1421 png_bytep chunk_list;
1422 #endif
1423
1424 /* New members added in libpng-1.0.3 */
1425 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1426 png_byte rgb_to_gray_status;
1427 /* These were changed from png_byte in libpng-1.0.6 */
1428 png_uint_16 rgb_to_gray_red_coeff;
1429 png_uint_16 rgb_to_gray_green_coeff;
1430 png_uint_16 rgb_to_gray_blue_coeff;
1431 #endif
1432
1433 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
1434 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \
1435 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1436 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1437 /* changed from png_byte to png_uint_32 at version 1.2.0 */
1438 #ifdef PNG_1_0_X
1439 png_byte mng_features_permitted;
1440 #else
1441 png_uint_32 mng_features_permitted;
1442 #endif /* PNG_1_0_X */
1443 #endif
1444
1445 /* New member added in libpng-1.0.7 */
1446 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1447 png_fixed_point int_gamma;
1448 #endif
1449
1450 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
1451 #if defined(PNG_MNG_FEATURES_SUPPORTED)
1452 png_byte filter_type;
1453 #endif
1454
1455 #if defined(PNG_1_0_X)
1456 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
1457 png_uint_32 row_buf_size;
1458 #endif
1459
1460 /* New members added in libpng-1.2.0 */
1461 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
1462 # if !defined(PNG_1_0_X)
1463 # if defined(PNG_MMX_CODE_SUPPORTED)
1464 png_byte mmx_bitdepth_threshold;
1465 png_uint_32 mmx_rowbytes_threshold;
1466 # endif
1467 png_uint_32 asm_flags;
1468 # endif
1469 #endif
1470
1471 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
1472 #ifdef PNG_USER_MEM_SUPPORTED
1473 png_voidp mem_ptr; /* user supplied struct for mem functions */
1474 png_malloc_ptr malloc_fn; /* function for allocating memory */
1475 png_free_ptr free_fn; /* function for freeing memory */
1476 #endif
1477
1478 /* New member added in libpng-1.0.13 and 1.2.0 */
1479 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
1480
1481 #if defined(PNG_READ_DITHER_SUPPORTED)
1482 /* The following three members were added at version 1.0.14 and 1.2.4 */
1483 png_bytep dither_sort; /* working sort array */
1484 png_bytep index_to_palette; /* where the original index currently is */
1485 /* in the palette */
1486 png_bytep palette_to_index; /* which original index points to this */
1487 /* palette color */
1488 #endif
1489
1490 /* New members added in libpng-1.0.16 and 1.2.6 */
1491 png_byte compression_type;
1492
1493 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1494 png_uint_32 user_width_max;
1495 png_uint_32 user_height_max;
1496 #endif
1497
1498 /* New member added in libpng-1.0.25 and 1.2.17 */
1499 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1500 /* Storage for unknown chunk that the library doesn't recognize. */
1501 png_unknown_chunk unknown_chunk;
1502 #endif
1503
1504 /* New members added in libpng-1.2.26 */
1505 png_uint_32 old_big_row_buf_size, old_prev_row_size;
1506
1507 /* New member added in libpng-1.2.30 */
1508 png_charp chunkdata; /* buffer for reading chunk data */
1509
1510 };
1511
1512
1513 /* This triggers a compiler error in png.c, if png.c and png.h
1514 * do not agree upon the version number.
1515 */
1516 typedef png_structp version_1_2_39;
1517
1518 typedef png_struct FAR * FAR * png_structpp;
1519
1520 /* Here are the function definitions most commonly used. This is not
1521 * the place to find out how to use libpng. See libpng.txt for the
1522 * full explanation, see example.c for the summary. This just provides
1523 * a simple one line description of the use of each function.
1524 */
1525
1526 /* Returns the version number of the library */
1527 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
1528
1529 /* Tell lib we have already handled the first <num_bytes> magic bytes.
1530 * Handling more than 8 bytes from the beginning of the file is an error.
1531 */
1532 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
1533 int num_bytes));
1534
1535 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
1536 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG
1537 * signature, and non-zero otherwise. Having num_to_check == 0 or
1538 * start > 7 will always fail (ie return non-zero).
1539 */
1540 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
1541 png_size_t num_to_check));
1542
1543 /* Simple signature checking function. This is the same as calling
1544 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1545 */
1546 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
1547
1548 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
1549 extern PNG_EXPORT(png_structp,png_create_read_struct)
1550 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1551 png_error_ptr error_fn, png_error_ptr warn_fn));
1552
1553 /* Allocate and initialize png_ptr struct for writing, and any other memory */
1554 extern PNG_EXPORT(png_structp,png_create_write_struct)
1555 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1556 png_error_ptr error_fn, png_error_ptr warn_fn));
1557
1558 #ifdef PNG_WRITE_SUPPORTED
1559 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
1560 PNGARG((png_structp png_ptr));
1561 #endif
1562
1563 #ifdef PNG_WRITE_SUPPORTED
1564 extern PNG_EXPORT(void,png_set_compression_buffer_size)
1565 PNGARG((png_structp png_ptr, png_uint_32 size));
1566 #endif
1567
1568 /* Reset the compression stream */
1569 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
1570
1571 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1572 #ifdef PNG_USER_MEM_SUPPORTED
1573 extern PNG_EXPORT(png_structp,png_create_read_struct_2)
1574 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1575 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1576 png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1577 extern PNG_EXPORT(png_structp,png_create_write_struct_2)
1578 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1579 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1580 png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1581 #endif
1582
1583 /* Write a PNG chunk - size, type, (optional) data, CRC. */
1584 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
1585 png_bytep chunk_name, png_bytep data, png_size_t length));
1586
1587 /* Write the start of a PNG chunk - length and chunk name. */
1588 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
1589 png_bytep chunk_name, png_uint_32 length));
1590
1591 /* Write the data of a PNG chunk started with png_write_chunk_start(). */
1592 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
1593 png_bytep data, png_size_t length));
1594
1595 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1596 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
1597
1598 /* Allocate and initialize the info structure */
1599 extern PNG_EXPORT(png_infop,png_create_info_struct)
1600 PNGARG((png_structp png_ptr));
1601
1602 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1603 /* Initialize the info structure (old interface - DEPRECATED) */
1604 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
1605 #undef png_info_init
1606 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
1607 png_sizeof(png_info));
1608 #endif
1609
1610 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
1611 png_size_t png_info_struct_size));
1612
1613 /* Writes all the PNG information before the image. */
1614 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
1615 png_infop info_ptr));
1616 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
1617 png_infop info_ptr));
1618
1619 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1620 /* Read the information before the actual image data. */
1621 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
1622 png_infop info_ptr));
1623 #endif
1624
1625 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1626 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
1627 PNGARG((png_structp png_ptr, png_timep ptime));
1628 #endif
1629
1630 #if !defined(_WIN32_WCE)
1631 /* "time.h" functions are not supported on WindowsCE */
1632 #if defined(PNG_WRITE_tIME_SUPPORTED)
1633 /* Convert from a struct tm to png_time */
1634 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
1635 struct tm FAR * ttime));
1636
1637 /* Convert from time_t to png_time. Uses gmtime() */
1638 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
1639 time_t ttime));
1640 #endif /* PNG_WRITE_tIME_SUPPORTED */
1641 #endif /* _WIN32_WCE */
1642
1643 #if defined(PNG_READ_EXPAND_SUPPORTED)
1644 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1645 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
1646 #if !defined(PNG_1_0_X)
1647 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
1648 png_ptr));
1649 #endif
1650 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
1651 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
1652 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1653 /* Deprecated */
1654 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
1655 #endif
1656 #endif
1657
1658 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1659 /* Use blue, green, red order for pixels. */
1660 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
1661 #endif
1662
1663 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
1664 /* Expand the grayscale to 24-bit RGB if necessary. */
1665 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
1666 #endif
1667
1668 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1669 /* Reduce RGB to grayscale. */
1670 #ifdef PNG_FLOATING_POINT_SUPPORTED
1671 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
1672 int error_action, double red, double green ));
1673 #endif
1674 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
1675 int error_action, png_fixed_point red, png_fixed_point green ));
1676 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
1677 png_ptr));
1678 #endif
1679
1680 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
1681 png_colorp palette));
1682
1683 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1684 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
1685 #endif
1686
1687 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
1688 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1689 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
1690 #endif
1691
1692 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
1693 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1694 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
1695 #endif
1696
1697 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1698 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
1699 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
1700 png_uint_32 filler, int flags));
1701 /* The values of the PNG_FILLER_ defines should NOT be changed */
1702 #define PNG_FILLER_BEFORE 0
1703 #define PNG_FILLER_AFTER 1
1704 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
1705 #if !defined(PNG_1_0_X)
1706 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
1707 png_uint_32 filler, int flags));
1708 #endif
1709 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
1710
1711 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1712 /* Swap bytes in 16-bit depth files. */
1713 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
1714 #endif
1715
1716 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
1717 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
1718 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
1719 #endif
1720
1721 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1722 /* Swap packing order of pixels in bytes. */
1723 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
1724 #endif
1725
1726 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1727 /* Converts files to legal bit depths. */
1728 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
1729 png_color_8p true_bits));
1730 #endif
1731
1732 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1733 defined(PNG_WRITE_INTERLACING_SUPPORTED)
1734 /* Have the code handle the interlacing. Returns the number of passes. */
1735 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
1736 #endif
1737
1738 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1739 /* Invert monochrome files */
1740 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
1741 #endif
1742
1743 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
1744 /* Handle alpha and tRNS by replacing with a background color. */
1745 #ifdef PNG_FLOATING_POINT_SUPPORTED
1746 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
1747 png_color_16p background_color, int background_gamma_code,
1748 int need_expand, double background_gamma));
1749 #endif
1750 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0
1751 #define PNG_BACKGROUND_GAMMA_SCREEN 1
1752 #define PNG_BACKGROUND_GAMMA_FILE 2
1753 #define PNG_BACKGROUND_GAMMA_UNIQUE 3
1754 #endif
1755
1756 #if defined(PNG_READ_16_TO_8_SUPPORTED)
1757 /* Strip the second byte of information from a 16-bit depth file. */
1758 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
1759 #endif
1760
1761 #if defined(PNG_READ_DITHER_SUPPORTED)
1762 /* Turn on dithering, and reduce the palette to the number of colors available. */
1763 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
1764 png_colorp palette, int num_palette, int maximum_colors,
1765 png_uint_16p histogram, int full_dither));
1766 #endif
1767
1768 #if defined(PNG_READ_GAMMA_SUPPORTED)
1769 /* Handle gamma correction. Screen_gamma=(display_exponent) */
1770 #ifdef PNG_FLOATING_POINT_SUPPORTED
1771 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
1772 double screen_gamma, double default_file_gamma));
1773 #endif
1774 #endif
1775
1776 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1777 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1778 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1779 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
1780 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */
1781 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
1782 int empty_plte_permitted));
1783 #endif
1784 #endif
1785
1786 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
1787 /* Set how many lines between output flushes - 0 for no flushing */
1788 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
1789 /* Flush the current PNG output buffer */
1790 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
1791 #endif
1792
1793 /* Optional update palette with requested transformations */
1794 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
1795
1796 /* Optional call to update the users info structure */
1797 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
1798 png_infop info_ptr));
1799
1800 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1801 /* Read one or more rows of image data. */
1802 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
1803 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
1804 #endif
1805
1806 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1807 /* Read a row of data. */
1808 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
1809 png_bytep row,
1810 png_bytep display_row));
1811 #endif
1812
1813 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1814 /* Read the whole image into memory at once. */
1815 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
1816 png_bytepp image));
1817 #endif
1818
1819 /* Write a row of image data */
1820 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
1821 png_bytep row));
1822
1823 /* Write a few rows of image data */
1824 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
1825 png_bytepp row, png_uint_32 num_rows));
1826
1827 /* Write the image data */
1828 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
1829 png_bytepp image));
1830
1831 /* Writes the end of the PNG file. */
1832 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
1833 png_infop info_ptr));
1834
1835 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1836 /* Read the end of the PNG file. */
1837 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
1838 png_infop info_ptr));
1839 #endif
1840
1841 /* Free any memory associated with the png_info_struct */
1842 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
1843 png_infopp info_ptr_ptr));
1844
1845 /* Free any memory associated with the png_struct and the png_info_structs */
1846 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
1847 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
1848
1849 /* Free all memory used by the read (old method - NOT DLL EXPORTED) */
1850 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
1851 png_infop end_info_ptr));
1852
1853 /* Free any memory associated with the png_struct and the png_info_structs */
1854 extern PNG_EXPORT(void,png_destroy_write_struct)
1855 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
1856
1857 /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1858 extern void png_write_destroy PNGARG((png_structp png_ptr));
1859
1860 /* Set the libpng method of handling chunk CRC errors */
1861 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
1862 int crit_action, int ancil_action));
1863
1864 /* Values for png_set_crc_action() to say how to handle CRC errors in
1865 * ancillary and critical chunks, and whether to use the data contained
1866 * therein. Note that it is impossible to "discard" data in a critical
1867 * chunk. For versions prior to 0.90, the action was always error/quit,
1868 * whereas in version 0.90 and later, the action for CRC errors in ancillary
1869 * chunks is warn/discard. These values should NOT be changed.
1870 *
1871 * value action:critical action:ancillary
1872 */
1873 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
1874 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
1875 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
1876 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
1877 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
1878 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
1879
1880 /* These functions give the user control over the scan-line filtering in
1881 * libpng and the compression methods used by zlib. These functions are
1882 * mainly useful for testing, as the defaults should work with most users.
1883 * Those users who are tight on memory or want faster performance at the
1884 * expense of compression can modify them. See the compression library
1885 * header file (zlib.h) for an explination of the compression functions.
1886 */
1887
1888 /* Set the filtering method(s) used by libpng. Currently, the only valid
1889 * value for "method" is 0.
1890 */
1891 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
1892 int filters));
1893
1894 /* Flags for png_set_filter() to say which filters to use. The flags
1895 * are chosen so that they don't conflict with real filter types
1896 * below, in case they are supplied instead of the #defined constants.
1897 * These values should NOT be changed.
1898 */
1899 #define PNG_NO_FILTERS 0x00
1900 #define PNG_FILTER_NONE 0x08
1901 #define PNG_FILTER_SUB 0x10
1902 #define PNG_FILTER_UP 0x20
1903 #define PNG_FILTER_AVG 0x40
1904 #define PNG_FILTER_PAETH 0x80
1905 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
1906 PNG_FILTER_AVG | PNG_FILTER_PAETH)
1907
1908 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
1909 * These defines should NOT be changed.
1910 */
1911 #define PNG_FILTER_VALUE_NONE 0
1912 #define PNG_FILTER_VALUE_SUB 1
1913 #define PNG_FILTER_VALUE_UP 2
1914 #define PNG_FILTER_VALUE_AVG 3
1915 #define PNG_FILTER_VALUE_PAETH 4
1916 #define PNG_FILTER_VALUE_LAST 5
1917
1918 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
1919 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
1920 * defines, either the default (minimum-sum-of-absolute-differences), or
1921 * the experimental method (weighted-minimum-sum-of-absolute-differences).
1922 *
1923 * Weights are factors >= 1.0, indicating how important it is to keep the
1924 * filter type consistent between rows. Larger numbers mean the current
1925 * filter is that many times as likely to be the same as the "num_weights"
1926 * previous filters. This is cumulative for each previous row with a weight.
1927 * There needs to be "num_weights" values in "filter_weights", or it can be
1928 * NULL if the weights aren't being specified. Weights have no influence on
1929 * the selection of the first row filter. Well chosen weights can (in theory)
1930 * improve the compression for a given image.
1931 *
1932 * Costs are factors >= 1.0 indicating the relative decoding costs of a
1933 * filter type. Higher costs indicate more decoding expense, and are
1934 * therefore less likely to be selected over a filter with lower computational
1935 * costs. There needs to be a value in "filter_costs" for each valid filter
1936 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
1937 * setting the costs. Costs try to improve the speed of decompression without
1938 * unduly increasing the compressed image size.
1939 *
1940 * A negative weight or cost indicates the default value is to be used, and
1941 * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
1942 * The default values for both weights and costs are currently 1.0, but may
1943 * change if good general weighting/cost heuristics can be found. If both
1944 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
1945 * to the UNWEIGHTED method, but with added encoding time/computation.
1946 */
1947 #ifdef PNG_FLOATING_POINT_SUPPORTED
1948 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
1949 int heuristic_method, int num_weights, png_doublep filter_weights,
1950 png_doublep filter_costs));
1951 #endif
1952 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1953
1954 /* Heuristic used for row filter selection. These defines should NOT be
1955 * changed.
1956 */
1957 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
1958 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
1959 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
1960 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
1961
1962 /* Set the library compression level. Currently, valid values range from
1963 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
1964 * (0 - no compression, 9 - "maximal" compression). Note that tests have
1965 * shown that zlib compression levels 3-6 usually perform as well as level 9
1966 * for PNG images, and do considerably fewer caclulations. In the future,
1967 * these values may not correspond directly to the zlib compression levels.
1968 */
1969 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
1970 int level));
1971
1972 extern PNG_EXPORT(void,png_set_compression_mem_level)
1973 PNGARG((png_structp png_ptr, int mem_level));
1974
1975 extern PNG_EXPORT(void,png_set_compression_strategy)
1976 PNGARG((png_structp png_ptr, int strategy));
1977
1978 extern PNG_EXPORT(void,png_set_compression_window_bits)
1979 PNGARG((png_structp png_ptr, int window_bits));
1980
1981 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
1982 int method));
1983
1984 /* These next functions are called for input/output, memory, and error
1985 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
1986 * and call standard C I/O routines such as fread(), fwrite(), and
1987 * fprintf(). These functions can be made to use other I/O routines
1988 * at run time for those applications that need to handle I/O in a
1989 * different manner by calling png_set_???_fn(). See libpng.txt for
1990 * more information.
1991 */
1992
1993 #if !defined(PNG_NO_STDIO)
1994 /* Initialize the input/output for the PNG file to the default functions. */
1995 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
1996 #endif
1997
1998 /* Replace the (error and abort), and warning functions with user
1999 * supplied functions. If no messages are to be printed you must still
2000 * write and use replacement functions. The replacement error_fn should
2001 * still do a longjmp to the last setjmp location if you are using this
2002 * method of error handling. If error_fn or warning_fn is NULL, the
2003 * default function will be used.
2004 */
2005
2006 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
2007 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
2008
2009 /* Return the user pointer associated with the error functions */
2010 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
2011
2012 /* Replace the default data output functions with a user supplied one(s).
2013 * If buffered output is not used, then output_flush_fn can be set to NULL.
2014 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
2015 * output_flush_fn will be ignored (and thus can be NULL).
2016 * It is probably a mistake to use NULL for output_flush_fn if
2017 * write_data_fn is not also NULL unless you have built libpng with
2018 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
2019 * default flush function, which uses the standard *FILE structure, will
2020 * be used.
2021 */
2022 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
2023 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
2024
2025 /* Replace the default data input function with a user supplied one. */
2026 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
2027 png_voidp io_ptr, png_rw_ptr read_data_fn));
2028
2029 /* Return the user pointer associated with the I/O functions */
2030 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
2031
2032 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
2033 png_read_status_ptr read_row_fn));
2034
2035 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
2036 png_write_status_ptr write_row_fn));
2037
2038 #ifdef PNG_USER_MEM_SUPPORTED
2039 /* Replace the default memory allocation functions with user supplied one(s). */
2040 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
2041 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
2042 /* Return the user pointer associated with the memory functions */
2043 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
2044 #endif
2045
2046 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
2047 defined(PNG_LEGACY_SUPPORTED)
2048 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
2049 png_ptr, png_user_transform_ptr read_user_transform_fn));
2050 #endif
2051
2052 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
2053 defined(PNG_LEGACY_SUPPORTED)
2054 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
2055 png_ptr, png_user_transform_ptr write_user_transform_fn));
2056 #endif
2057
2058 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
2059 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
2060 defined(PNG_LEGACY_SUPPORTED)
2061 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
2062 png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
2063 int user_transform_channels));
2064 /* Return the user pointer associated with the user transform functions */
2065 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
2066 PNGARG((png_structp png_ptr));
2067 #endif
2068
2069 #ifdef PNG_USER_CHUNKS_SUPPORTED
2070 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
2071 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
2072 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
2073 png_ptr));
2074 #endif
2075
2076 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2077 /* Sets the function callbacks for the push reader, and a pointer to a
2078 * user-defined structure available to the callback functions.
2079 */
2080 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
2081 png_voidp progressive_ptr,
2082 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
2083 png_progressive_end_ptr end_fn));
2084
2085 /* Returns the user pointer associated with the push read functions */
2086 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
2087 PNGARG((png_structp png_ptr));
2088
2089 /* Function to be called when data becomes available */
2090 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
2091 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
2092
2093 /* function that combines rows. Not very much different than the
2094 * png_combine_row() call. Is this even used?????
2095 */
2096 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
2097 png_bytep old_row, png_bytep new_row));
2098 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
2099
2100 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
2101 png_uint_32 size));
2102
2103 #if defined(PNG_1_0_X)
2104 # define png_malloc_warn png_malloc
2105 #else
2106 /* Added at libpng version 1.2.4 */
2107 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
2108 png_uint_32 size));
2109 #endif
2110
2111 /* Frees a pointer allocated by png_malloc() */
2112 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
2113
2114 #if defined(PNG_1_0_X)
2115 /* Function to allocate memory for zlib. */
2116 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
2117 uInt size));
2118
2119 /* Function to free memory for zlib */
2120 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
2121 #endif
2122
2123 /* Free data that was allocated internally */
2124 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
2125 png_infop info_ptr, png_uint_32 free_me, int num));
2126 #ifdef PNG_FREE_ME_SUPPORTED
2127 /* Reassign responsibility for freeing existing data, whether allocated
2128 * by libpng or by the application
2129 */
2130 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
2131 png_infop info_ptr, int freer, png_uint_32 mask));
2132 #endif
2133 /* Assignments for png_data_freer */
2134 #define PNG_DESTROY_WILL_FREE_DATA 1
2135 #define PNG_SET_WILL_FREE_DATA 1
2136 #define PNG_USER_WILL_FREE_DATA 2
2137 /* Flags for png_ptr->free_me and info_ptr->free_me */
2138 #define PNG_FREE_HIST 0x0008
2139 #define PNG_FREE_ICCP 0x0010
2140 #define PNG_FREE_SPLT 0x0020
2141 #define PNG_FREE_ROWS 0x0040
2142 #define PNG_FREE_PCAL 0x0080
2143 #define PNG_FREE_SCAL 0x0100
2144 #define PNG_FREE_UNKN 0x0200
2145 #define PNG_FREE_LIST 0x0400
2146 #define PNG_FREE_PLTE 0x1000
2147 #define PNG_FREE_TRNS 0x2000
2148 #define PNG_FREE_TEXT 0x4000
2149 #define PNG_FREE_ALL 0x7fff
2150 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
2151
2152 #ifdef PNG_USER_MEM_SUPPORTED
2153 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
2154 png_uint_32 size));
2155 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
2156 png_voidp ptr));
2157 #endif
2158
2159 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
2160 png_voidp s1, png_voidp s2, png_uint_32 size));
2161
2162 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
2163 png_voidp s1, int value, png_uint_32 size));
2164
2165 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */
2166 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
2167 int check));
2168 #endif /* USE_FAR_KEYWORD */
2169
2170 #ifndef PNG_NO_ERROR_TEXT
2171 /* Fatal error in PNG image of libpng - can't continue */
2172 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
2173 png_const_charp error_message));
2174
2175 /* The same, but the chunk name is prepended to the error string. */
2176 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
2177 png_const_charp error_message));
2178 #else
2179 /* Fatal error in PNG image of libpng - can't continue */
2180 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
2181 #endif
2182
2183 #ifndef PNG_NO_WARNINGS
2184 /* Non-fatal error in libpng. Can continue, but may have a problem. */
2185 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
2186 png_const_charp warning_message));
2187
2188 #ifdef PNG_READ_SUPPORTED
2189 /* Non-fatal error in libpng, chunk name is prepended to message. */
2190 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
2191 png_const_charp warning_message));
2192 #endif /* PNG_READ_SUPPORTED */
2193 #endif /* PNG_NO_WARNINGS */
2194
2195 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
2196 * Similarly, the png_get_<chunk> calls are used to read values from the
2197 * png_info_struct, either storing the parameters in the passed variables, or
2198 * setting pointers into the png_info_struct where the data is stored. The
2199 * png_get_<chunk> functions return a non-zero value if the data was available
2200 * in info_ptr, or return zero and do not change any of the parameters if the
2201 * data was not available.
2202 *
2203 * These functions should be used instead of directly accessing png_info
2204 * to avoid problems with future changes in the size and internal layout of
2205 * png_info_struct.
2206 */
2207 /* Returns "flag" if chunk data is valid in info_ptr. */
2208 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
2209 png_infop info_ptr, png_uint_32 flag));
2210
2211 /* Returns number of bytes needed to hold a transformed row. */
2212 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
2213 png_infop info_ptr));
2214
2215 #if defined(PNG_INFO_IMAGE_SUPPORTED)
2216 /* Returns row_pointers, which is an array of pointers to scanlines that was
2217 * returned from png_read_png().
2218 */
2219 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
2220 png_infop info_ptr));
2221 /* Set row_pointers, which is an array of pointers to scanlines for use
2222 * by png_write_png().
2223 */
2224 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
2225 png_infop info_ptr, png_bytepp row_pointers));
2226 #endif
2227
2228 /* Returns number of color channels in image. */
2229 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
2230 png_infop info_ptr));
2231
2232 #ifdef PNG_EASY_ACCESS_SUPPORTED
2233 /* Returns image width in pixels. */
2234 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
2235 png_ptr, png_infop info_ptr));
2236
2237 /* Returns image height in pixels. */
2238 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
2239 png_ptr, png_infop info_ptr));
2240
2241 /* Returns image bit_depth. */
2242 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
2243 png_ptr, png_infop info_ptr));
2244
2245 /* Returns image color_type. */
2246 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
2247 png_ptr, png_infop info_ptr));
2248
2249 /* Returns image filter_type. */
2250 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
2251 png_ptr, png_infop info_ptr));
2252
2253 /* Returns image interlace_type. */
2254 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
2255 png_ptr, png_infop info_ptr));
2256
2257 /* Returns image compression_type. */
2258 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
2259 png_ptr, png_infop info_ptr));
2260
2261 /* Returns image resolution in pixels per meter, from pHYs chunk data. */
2262 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
2263 png_ptr, png_infop info_ptr));
2264 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
2265 png_ptr, png_infop info_ptr));
2266 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
2267 png_ptr, png_infop info_ptr));
2268
2269 /* Returns pixel aspect ratio, computed from pHYs chunk data. */
2270 #ifdef PNG_FLOATING_POINT_SUPPORTED
2271 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
2272 png_ptr, png_infop info_ptr));
2273 #endif
2274
2275 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
2276 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
2277 png_ptr, png_infop info_ptr));
2278 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
2279 png_ptr, png_infop info_ptr));
2280 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
2281 png_ptr, png_infop info_ptr));
2282 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
2283 png_ptr, png_infop info_ptr));
2284
2285 #endif /* PNG_EASY_ACCESS_SUPPORTED */
2286
2287 /* Returns pointer to signature string read from PNG header */
2288 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
2289 png_infop info_ptr));
2290
2291 #if defined(PNG_bKGD_SUPPORTED)
2292 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
2293 png_infop info_ptr, png_color_16p *background));
2294 #endif
2295
2296 #if defined(PNG_bKGD_SUPPORTED)
2297 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
2298 png_infop info_ptr, png_color_16p background));
2299 #endif
2300
2301 #if defined(PNG_cHRM_SUPPORTED)
2302 #ifdef PNG_FLOATING_POINT_SUPPORTED
2303 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
2304 png_infop info_ptr, double *white_x, double *white_y, double *red_x,
2305 double *red_y, double *green_x, double *green_y, double *blue_x,
2306 double *blue_y));
2307 #endif
2308 #ifdef PNG_FIXED_POINT_SUPPORTED
2309 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
2310 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
2311 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
2312 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
2313 *int_blue_x, png_fixed_point *int_blue_y));
2314 #endif
2315 #endif
2316
2317 #if defined(PNG_cHRM_SUPPORTED)
2318 #ifdef PNG_FLOATING_POINT_SUPPORTED
2319 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
2320 png_infop info_ptr, double white_x, double white_y, double red_x,
2321 double red_y, double green_x, double green_y, double blue_x, double blue_y));
2322 #endif
2323 #ifdef PNG_FIXED_POINT_SUPPORTED
2324 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
2325 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
2326 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
2327 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
2328 png_fixed_point int_blue_y));
2329 #endif
2330 #endif
2331
2332 #if defined(PNG_gAMA_SUPPORTED)
2333 #ifdef PNG_FLOATING_POINT_SUPPORTED
2334 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
2335 png_infop info_ptr, double *file_gamma));
2336 #endif
2337 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
2338 png_infop info_ptr, png_fixed_point *int_file_gamma));
2339 #endif
2340
2341 #if defined(PNG_gAMA_SUPPORTED)
2342 #ifdef PNG_FLOATING_POINT_SUPPORTED
2343 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
2344 png_infop info_ptr, double file_gamma));
2345 #endif
2346 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
2347 png_infop info_ptr, png_fixed_point int_file_gamma));
2348 #endif
2349
2350 #if defined(PNG_hIST_SUPPORTED)
2351 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
2352 png_infop info_ptr, png_uint_16p *hist));
2353 #endif
2354
2355 #if defined(PNG_hIST_SUPPORTED)
2356 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
2357 png_infop info_ptr, png_uint_16p hist));
2358 #endif
2359
2360 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
2361 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
2362 int *bit_depth, int *color_type, int *interlace_method,
2363 int *compression_method, int *filter_method));
2364
2365 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
2366 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
2367 int color_type, int interlace_method, int compression_method,
2368 int filter_method));
2369
2370 #if defined(PNG_oFFs_SUPPORTED)
2371 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
2372 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
2373 int *unit_type));
2374 #endif
2375
2376 #if defined(PNG_oFFs_SUPPORTED)
2377 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
2378 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
2379 int unit_type));
2380 #endif
2381
2382 #if defined(PNG_pCAL_SUPPORTED)
2383 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
2384 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
2385 int *type, int *nparams, png_charp *units, png_charpp *params));
2386 #endif
2387
2388 #if defined(PNG_pCAL_SUPPORTED)
2389 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
2390 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
2391 int type, int nparams, png_charp units, png_charpp params));
2392 #endif
2393
2394 #if defined(PNG_pHYs_SUPPORTED)
2395 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
2396 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
2397 #endif
2398
2399 #if defined(PNG_pHYs_SUPPORTED)
2400 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
2401 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
2402 #endif
2403
2404 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
2405 png_infop info_ptr, png_colorp *palette, int *num_palette));
2406
2407 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
2408 png_infop info_ptr, png_colorp palette, int num_palette));
2409
2410 #if defined(PNG_sBIT_SUPPORTED)
2411 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
2412 png_infop info_ptr, png_color_8p *sig_bit));
2413 #endif
2414
2415 #if defined(PNG_sBIT_SUPPORTED)
2416 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
2417 png_infop info_ptr, png_color_8p sig_bit));
2418 #endif
2419
2420 #if defined(PNG_sRGB_SUPPORTED)
2421 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
2422 png_infop info_ptr, int *intent));
2423 #endif
2424
2425 #if defined(PNG_sRGB_SUPPORTED)
2426 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
2427 png_infop info_ptr, int intent));
2428 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
2429 png_infop info_ptr, int intent));
2430 #endif
2431
2432 #if defined(PNG_iCCP_SUPPORTED)
2433 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
2434 png_infop info_ptr, png_charpp name, int *compression_type,
2435 png_charpp profile, png_uint_32 *proflen));
2436 /* Note to maintainer: profile should be png_bytepp */
2437 #endif
2438
2439 #if defined(PNG_iCCP_SUPPORTED)
2440 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
2441 png_infop info_ptr, png_charp name, int compression_type,
2442 png_charp profile, png_uint_32 proflen));
2443 /* Note to maintainer: profile should be png_bytep */
2444 #endif
2445
2446 #if defined(PNG_sPLT_SUPPORTED)
2447 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
2448 png_infop info_ptr, png_sPLT_tpp entries));
2449 #endif
2450
2451 #if defined(PNG_sPLT_SUPPORTED)
2452 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
2453 png_infop info_ptr, png_sPLT_tp entries, int nentries));
2454 #endif
2455
2456 #if defined(PNG_TEXT_SUPPORTED)
2457 /* png_get_text also returns the number of text chunks in *num_text */
2458 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
2459 png_infop info_ptr, png_textp *text_ptr, int *num_text));
2460 #endif
2461
2462 /*
2463 * Note while png_set_text() will accept a structure whose text,
2464 * language, and translated keywords are NULL pointers, the structure
2465 * returned by png_get_text will always contain regular
2466 * zero-terminated C strings. They might be empty strings but
2467 * they will never be NULL pointers.
2468 */
2469
2470 #if defined(PNG_TEXT_SUPPORTED)
2471 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
2472 png_infop info_ptr, png_textp text_ptr, int num_text));
2473 #endif
2474
2475 #if defined(PNG_tIME_SUPPORTED)
2476 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
2477 png_infop info_ptr, png_timep *mod_time));
2478 #endif
2479
2480 #if defined(PNG_tIME_SUPPORTED)
2481 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
2482 png_infop info_ptr, png_timep mod_time));
2483 #endif
2484
2485 #if defined(PNG_tRNS_SUPPORTED)
2486 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
2487 png_infop info_ptr, png_bytep *trans, int *num_trans,
2488 png_color_16p *trans_values));
2489 #endif
2490
2491 #if defined(PNG_tRNS_SUPPORTED)
2492 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
2493 png_infop info_ptr, png_bytep trans, int num_trans,
2494 png_color_16p trans_values));
2495 #endif
2496
2497 #if defined(PNG_tRNS_SUPPORTED)
2498 #endif
2499
2500 #if defined(PNG_sCAL_SUPPORTED)
2501 #ifdef PNG_FLOATING_POINT_SUPPORTED
2502 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
2503 png_infop info_ptr, int *unit, double *width, double *height));
2504 #else
2505 #ifdef PNG_FIXED_POINT_SUPPORTED
2506 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
2507 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
2508 #endif
2509 #endif
2510 #endif /* PNG_sCAL_SUPPORTED */
2511
2512 #if defined(PNG_sCAL_SUPPORTED)
2513 #ifdef PNG_FLOATING_POINT_SUPPORTED
2514 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
2515 png_infop info_ptr, int unit, double width, double height));
2516 #else
2517 #ifdef PNG_FIXED_POINT_SUPPORTED
2518 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
2519 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
2520 #endif
2521 #endif
2522 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
2523
2524 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2525 /* Provide a list of chunks and how they are to be handled, if the built-in
2526 handling or default unknown chunk handling is not desired. Any chunks not
2527 listed will be handled in the default manner. The IHDR and IEND chunks
2528 must not be listed.
2529 keep = 0: follow default behaviour
2530 = 1: do not keep
2531 = 2: keep only if safe-to-copy
2532 = 3: keep even if unsafe-to-copy
2533 */
2534 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
2535 png_ptr, int keep, png_bytep chunk_list, int num_chunks));
2536 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
2537 chunk_name));
2538 #endif
2539 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
2540 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
2541 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
2542 extern PNG_EXPORT(void, png_set_unknown_chunk_location)
2543 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
2544 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
2545 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
2546 #endif
2547
2548 /* Png_free_data() will turn off the "valid" flag for anything it frees.
2549 * If you need to turn it off for a chunk that your application has freed,
2550 * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);
2551 */
2552 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
2553 png_infop info_ptr, int mask));
2554
2555 #if defined(PNG_INFO_IMAGE_SUPPORTED)
2556 /* The "params" pointer is currently not used and is for future expansion. */
2557 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
2558 png_infop info_ptr,
2559 int transforms,
2560 png_voidp params));
2561 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
2562 png_infop info_ptr,
2563 int transforms,
2564 png_voidp params));
2565 #endif
2566
2567 /* Define PNG_DEBUG at compile time for debugging information. Higher
2568 * numbers for PNG_DEBUG mean more debugging information. This has
2569 * only been added since version 0.95 so it is not implemented throughout
2570 * libpng yet, but more support will be added as needed.
2571 */
2572 #ifdef PNG_DEBUG
2573 #if (PNG_DEBUG > 0)
2574 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
2575 #include <crtdbg.h>
2576 #if (PNG_DEBUG > 1)
2577 #ifndef _DEBUG
2578 # define _DEBUG
2579 #endif
2580 #ifndef png_debug
2581 #define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
2582 #endif
2583 #ifndef png_debug1
2584 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
2585 #endif
2586 #ifndef png_debug2
2587 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
2588 #endif
2589 #endif
2590 #else /* PNG_DEBUG_FILE || !_MSC_VER */
2591 #ifndef PNG_DEBUG_FILE
2592 #define PNG_DEBUG_FILE stderr
2593 #endif /* PNG_DEBUG_FILE */
2594
2595 #if (PNG_DEBUG > 1)
2596 /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO
2597 * compilers.
2598 */
2599 # ifdef __STDC__
2600 # ifndef png_debug
2601 # define png_debug(l,m) \
2602 { \
2603 int num_tabs=l; \
2604 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2605 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
2606 }
2607 # endif
2608 # ifndef png_debug1
2609 # define png_debug1(l,m,p1) \
2610 { \
2611 int num_tabs=l; \
2612 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2613 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
2614 }
2615 # endif
2616 # ifndef png_debug2
2617 # define png_debug2(l,m,p1,p2) \
2618 { \
2619 int num_tabs=l; \
2620 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2621 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
2622 }
2623 # endif
2624 # else /* __STDC __ */
2625 # ifndef png_debug
2626 # define png_debug(l,m) \
2627 { \
2628 int num_tabs=l; \
2629 char format[256]; \
2630 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2631 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2632 m,PNG_STRING_NEWLINE); \
2633 fprintf(PNG_DEBUG_FILE,format); \
2634 }
2635 # endif
2636 # ifndef png_debug1
2637 # define png_debug1(l,m,p1) \
2638 { \
2639 int num_tabs=l; \
2640 char format[256]; \
2641 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2642 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2643 m,PNG_STRING_NEWLINE); \
2644 fprintf(PNG_DEBUG_FILE,format,p1); \
2645 }
2646 # endif
2647 # ifndef png_debug2
2648 # define png_debug2(l,m,p1,p2) \
2649 { \
2650 int num_tabs=l; \
2651 char format[256]; \
2652 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2653 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2654 m,PNG_STRING_NEWLINE); \
2655 fprintf(PNG_DEBUG_FILE,format,p1,p2); \
2656 }
2657 # endif
2658 # endif /* __STDC __ */
2659 #endif /* (PNG_DEBUG > 1) */
2660
2661 #endif /* _MSC_VER */
2662 #endif /* (PNG_DEBUG > 0) */
2663 #endif /* PNG_DEBUG */
2664 #ifndef png_debug
2665 #define png_debug(l, m)
2666 #endif
2667 #ifndef png_debug1
2668 #define png_debug1(l, m, p1)
2669 #endif
2670 #ifndef png_debug2
2671 #define png_debug2(l, m, p1, p2)
2672 #endif
2673
2674 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
2675 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
2676 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
2677 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
2678
2679 #ifdef PNG_MNG_FEATURES_SUPPORTED
2680 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
2681 png_ptr, png_uint_32 mng_features_permitted));
2682 #endif
2683
2684 /* For use in png_set_keep_unknown, added to version 1.2.6 */
2685 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0
2686 #define PNG_HANDLE_CHUNK_NEVER 1
2687 #define PNG_HANDLE_CHUNK_IF_SAFE 2
2688 #define PNG_HANDLE_CHUNK_ALWAYS 3
2689
2690 /* Added to version 1.2.0 */
2691 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
2692 #if defined(PNG_MMX_CODE_SUPPORTED)
2693 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
2694 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
2695 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
2696 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
2697 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
2698 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
2699 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
2700 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
2701 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
2702
2703 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
2704 | PNG_ASM_FLAG_MMX_READ_INTERLACE \
2705 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
2706 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
2707 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
2708 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
2709 #define PNG_MMX_WRITE_FLAGS ( 0 )
2710
2711 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
2712 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
2713 | PNG_MMX_READ_FLAGS \
2714 | PNG_MMX_WRITE_FLAGS )
2715
2716 #define PNG_SELECT_READ 1
2717 #define PNG_SELECT_WRITE 2
2718 #endif /* PNG_MMX_CODE_SUPPORTED */
2719
2720 #if !defined(PNG_1_0_X)
2721 /* pngget.c */
2722 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
2723 PNGARG((int flag_select, int *compilerID));
2724
2725 /* pngget.c */
2726 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
2727 PNGARG((int flag_select));
2728
2729 /* pngget.c */
2730 extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
2731 PNGARG((png_structp png_ptr));
2732
2733 /* pngget.c */
2734 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
2735 PNGARG((png_structp png_ptr));
2736
2737 /* pngget.c */
2738 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
2739 PNGARG((png_structp png_ptr));
2740
2741 /* pngset.c */
2742 extern PNG_EXPORT(void,png_set_asm_flags)
2743 PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
2744
2745 /* pngset.c */
2746 extern PNG_EXPORT(void,png_set_mmx_thresholds)
2747 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
2748 png_uint_32 mmx_rowbytes_threshold));
2749
2750 #endif /* PNG_1_0_X */
2751
2752 #if !defined(PNG_1_0_X)
2753 /* png.c, pnggccrd.c, or pngvcrd.c */
2754 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
2755 #endif /* PNG_1_0_X */
2756 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
2757
2758 /* Strip the prepended error numbers ("#nnn ") from error and warning
2759 * messages before passing them to the error or warning handler.
2760 */
2761 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
2762 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
2763 png_ptr, png_uint_32 strip_mode));
2764 #endif
2765
2766 /* Added at libpng-1.2.6 */
2767 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
2768 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
2769 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
2770 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
2771 png_ptr));
2772 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
2773 png_ptr));
2774 #endif
2775
2776
2777 /* Maintainer: Put new public prototypes here ^, in libpng.3, and in
2778 * project defs
2779 */
2780
2781 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
2782 /* With these routines we avoid an integer divide, which will be slower on
2783 * most machines. However, it does take more operations than the corresponding
2784 * divide method, so it may be slower on a few RISC systems. There are two
2785 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
2786 *
2787 * Note that the rounding factors are NOT supposed to be the same! 128 and
2788 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
2789 * standard method.
2790 *
2791 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
2792 */
2793
2794 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2795
2796 # define png_composite(composite, fg, alpha, bg) \
2797 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
2798 + (png_uint_16)(bg)*(png_uint_16)(255 - \
2799 (png_uint_16)(alpha)) + (png_uint_16)128); \
2800 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
2801
2802 # define png_composite_16(composite, fg, alpha, bg) \
2803 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
2804 + (png_uint_32)(bg)*(png_uint_32)(65535L - \
2805 (png_uint_32)(alpha)) + (png_uint_32)32768L); \
2806 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
2807
2808 #else /* Standard method using integer division */
2809
2810 # define png_composite(composite, fg, alpha, bg) \
2811 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
2812 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2813 (png_uint_16)127) / 255)
2814
2815 # define png_composite_16(composite, fg, alpha, bg) \
2816 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
2817 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
2818 (png_uint_32)32767) / (png_uint_32)65535L)
2819
2820 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
2821
2822 /* Inline macros to do direct reads of bytes from the input buffer. These
2823 * require that you are using an architecture that uses PNG byte ordering
2824 * (MSB first) and supports unaligned data storage. I think that PowerPC
2825 * in big-endian mode and 680x0 are the only ones that will support this.
2826 * The x86 line of processors definitely do not. The png_get_int_32()
2827 * routine also assumes we are using two's complement format for negative
2828 * values, which is almost certainly true.
2829 */
2830 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
2831 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
2832 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
2833 # define png_get_int_32(buf) ( *((png_int_32p) (buf)))
2834 #else
2835 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
2836 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
2837 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
2838 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
2839 extern PNG_EXPORT(png_uint_32,png_get_uint_31)
2840 PNGARG((png_structp png_ptr, png_bytep buf));
2841 /* No png_get_int_16 -- may be added if there's a real need for it. */
2842
2843 /* Place a 32-bit number into a buffer in PNG byte order (big-endian).
2844 */
2845 extern PNG_EXPORT(void,png_save_uint_32)
2846 PNGARG((png_bytep buf, png_uint_32 i));
2847 extern PNG_EXPORT(void,png_save_int_32)
2848 PNGARG((png_bytep buf, png_int_32 i));
2849
2850 /* Place a 16-bit number into a buffer in PNG byte order.
2851 * The parameter is declared unsigned int, not png_uint_16,
2852 * just to avoid potential problems on pre-ANSI C compilers.
2853 */
2854 extern PNG_EXPORT(void,png_save_uint_16)
2855 PNGARG((png_bytep buf, unsigned int i));
2856 /* No png_save_int_16 -- may be added if there's a real need for it. */
2857
2858 /* ************************************************************************* */
2859
2860 /* These next functions are used internally in the code. They generally
2861 * shouldn't be used unless you are writing code to add or replace some
2862 * functionality in libpng. More information about most functions can
2863 * be found in the files where the functions are located.
2864 */
2865
2866
2867 /* Various modes of operation, that are visible to applications because
2868 * they are used for unknown chunk location.
2869 */
2870 #define PNG_HAVE_IHDR 0x01
2871 #define PNG_HAVE_PLTE 0x02
2872 #define PNG_HAVE_IDAT 0x04
2873 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
2874 #define PNG_HAVE_IEND 0x10
2875
2876 #if defined(PNG_INTERNAL)
2877
2878 /* More modes of operation. Note that after an init, mode is set to
2879 * zero automatically when the structure is created.
2880 */
2881 #define PNG_HAVE_gAMA 0x20
2882 #define PNG_HAVE_cHRM 0x40
2883 #define PNG_HAVE_sRGB 0x80
2884 #define PNG_HAVE_CHUNK_HEADER 0x100
2885 #define PNG_WROTE_tIME 0x200
2886 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
2887 #define PNG_BACKGROUND_IS_GRAY 0x800
2888 #define PNG_HAVE_PNG_SIGNATURE 0x1000
2889 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
2890
2891 /* Flags for the transformations the PNG library does on the image data */
2892 #define PNG_BGR 0x0001
2893 #define PNG_INTERLACE 0x0002
2894 #define PNG_PACK 0x0004
2895 #define PNG_SHIFT 0x0008
2896 #define PNG_SWAP_BYTES 0x0010
2897 #define PNG_INVERT_MONO 0x0020
2898 #define PNG_DITHER 0x0040
2899 #define PNG_BACKGROUND 0x0080
2900 #define PNG_BACKGROUND_EXPAND 0x0100
2901 /* 0x0200 unused */
2902 #define PNG_16_TO_8 0x0400
2903 #define PNG_RGBA 0x0800
2904 #define PNG_EXPAND 0x1000
2905 #define PNG_GAMMA 0x2000
2906 #define PNG_GRAY_TO_RGB 0x4000
2907 #define PNG_FILLER 0x8000L
2908 #define PNG_PACKSWAP 0x10000L
2909 #define PNG_SWAP_ALPHA 0x20000L
2910 #define PNG_STRIP_ALPHA 0x40000L
2911 #define PNG_INVERT_ALPHA 0x80000L
2912 #define PNG_USER_TRANSFORM 0x100000L
2913 #define PNG_RGB_TO_GRAY_ERR 0x200000L
2914 #define PNG_RGB_TO_GRAY_WARN 0x400000L
2915 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
2916 /* 0x800000L Unused */
2917 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
2918 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
2919 /* 0x4000000L unused */
2920 /* 0x8000000L unused */
2921 /* 0x10000000L unused */
2922 /* 0x20000000L unused */
2923 /* 0x40000000L unused */
2924
2925 /* Flags for png_create_struct */
2926 #define PNG_STRUCT_PNG 0x0001
2927 #define PNG_STRUCT_INFO 0x0002
2928
2929 /* Scaling factor for filter heuristic weighting calculations */
2930 #define PNG_WEIGHT_SHIFT 8
2931 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
2932 #define PNG_COST_SHIFT 3
2933 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
2934
2935 /* Flags for the png_ptr->flags rather than declaring a byte for each one */
2936 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
2937 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
2938 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
2939 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
2940 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
2941 #define PNG_FLAG_ZLIB_FINISHED 0x0020
2942 #define PNG_FLAG_ROW_INIT 0x0040
2943 #define PNG_FLAG_FILLER_AFTER 0x0080
2944 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
2945 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
2946 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
2947 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
2948 #define PNG_FLAG_FREE_PLTE 0x1000
2949 #define PNG_FLAG_FREE_TRNS 0x2000
2950 #define PNG_FLAG_FREE_HIST 0x4000
2951 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
2952 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
2953 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
2954 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
2955 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
2956 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
2957 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
2958 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
2959 /* 0x800000L unused */
2960 /* 0x1000000L unused */
2961 /* 0x2000000L unused */
2962 /* 0x4000000L unused */
2963 /* 0x8000000L unused */
2964 /* 0x10000000L unused */
2965 /* 0x20000000L unused */
2966 /* 0x40000000L unused */
2967
2968 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
2969 PNG_FLAG_CRC_ANCILLARY_NOWARN)
2970
2971 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
2972 PNG_FLAG_CRC_CRITICAL_IGNORE)
2973
2974 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
2975 PNG_FLAG_CRC_CRITICAL_MASK)
2976
2977 /* Save typing and make code easier to understand */
2978
2979 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
2980 abs((int)((c1).green) - (int)((c2).green)) + \
2981 abs((int)((c1).blue) - (int)((c2).blue)))
2982
2983 /* Added to libpng-1.2.6 JB */
2984 #define PNG_ROWBYTES(pixel_bits, width) \
2985 ((pixel_bits) >= 8 ? \
2986 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
2987 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
2988
2989 /* PNG_OUT_OF_RANGE returns true if value is outside the range
2990 * ideal-delta..ideal+delta. Each argument is evaluated twice.
2991 * "ideal" and "delta" should be constants, normally simple
2992 * integers, "value" a variable. Added to libpng-1.2.6 JB
2993 */
2994 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
2995 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
2996
2997 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
2998 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
2999 /* place to hold the signature string for a PNG file. */
3000 #ifdef PNG_USE_GLOBAL_ARRAYS
3001 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
3002 #else
3003 #endif
3004 #endif /* PNG_NO_EXTERN */
3005
3006 /* Constant strings for known chunk types. If you need to add a chunk,
3007 * define the name here, and add an invocation of the macro in png.c and
3008 * wherever it's needed.
3009 */
3010 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
3011 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
3012 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
3013 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
3014 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
3015 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
3016 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
3017 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
3018 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
3019 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
3020 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
3021 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
3022 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
3023 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
3024 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
3025 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
3026 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
3027 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
3028 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
3029 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
3030 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
3031
3032 #ifdef PNG_USE_GLOBAL_ARRAYS
3033 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
3034 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
3035 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
3036 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
3037 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
3038 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
3039 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
3040 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
3041 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
3042 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
3043 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
3044 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
3045 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
3046 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
3047 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
3048 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
3049 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
3050 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
3051 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
3052 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
3053 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
3054 #endif /* PNG_USE_GLOBAL_ARRAYS */
3055
3056 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
3057 /* Initialize png_ptr struct for reading, and allocate any other memory.
3058 * (old interface - DEPRECATED - use png_create_read_struct instead).
3059 */
3060 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
3061 #undef png_read_init
3062 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
3063 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
3064 #endif
3065
3066 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
3067 png_const_charp user_png_ver, png_size_t png_struct_size));
3068 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
3069 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
3070 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
3071 png_info_size));
3072 #endif
3073
3074 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
3075 /* Initialize png_ptr struct for writing, and allocate any other memory.
3076 * (old interface - DEPRECATED - use png_create_write_struct instead).
3077 */
3078 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
3079 #undef png_write_init
3080 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
3081 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
3082 #endif
3083
3084 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
3085 png_const_charp user_png_ver, png_size_t png_struct_size));
3086 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
3087 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
3088 png_info_size));
3089
3090 /* Allocate memory for an internal libpng struct */
3091 PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
3092
3093 /* Free memory from internal libpng struct */
3094 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
3095
3096 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
3097 malloc_fn, png_voidp mem_ptr));
3098 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
3099 png_free_ptr free_fn, png_voidp mem_ptr));
3100
3101 /* Free any memory that info_ptr points to and reset struct. */
3102 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
3103 png_infop info_ptr));
3104
3105 #ifndef PNG_1_0_X
3106 /* Function to allocate memory for zlib. */
3107 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
3108
3109 /* Function to free memory for zlib */
3110 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
3111
3112 #ifdef PNG_SIZE_T
3113 /* Function to convert a sizeof an item to png_sizeof item */
3114 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
3115 #endif
3116
3117 /* Next four functions are used internally as callbacks. PNGAPI is required
3118 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3.
3119 */
3120
3121 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
3122 png_bytep data, png_size_t length));
3123
3124 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3125 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
3126 png_bytep buffer, png_size_t length));
3127 #endif
3128
3129 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
3130 png_bytep data, png_size_t length));
3131
3132 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
3133 #if !defined(PNG_NO_STDIO)
3134 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
3135 #endif
3136 #endif
3137 #else /* PNG_1_0_X */
3138 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3139 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
3140 png_bytep buffer, png_size_t length));
3141 #endif
3142 #endif /* PNG_1_0_X */
3143
3144 /* Reset the CRC variable */
3145 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
3146
3147 /* Write the "data" buffer to whatever output you are using. */
3148 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
3149 png_size_t length));
3150
3151 /* Read data from whatever input you are using into the "data" buffer */
3152 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
3153 png_size_t length));
3154
3155 /* Read bytes into buf, and update png_ptr->crc */
3156 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
3157 png_size_t length));
3158
3159 /* Decompress data in a chunk that uses compression */
3160 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
3161 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
3162 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
3163 int comp_type, png_size_t chunklength,
3164 png_size_t prefix_length, png_size_t *data_length));
3165 #endif
3166
3167 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
3168 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
3169
3170 /* Read the CRC from the file and compare it to the libpng calculated CRC */
3171 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
3172
3173 /* Calculate the CRC over a section of data. Note that we are only
3174 * passing a maximum of 64K on systems that have this as a memory limit,
3175 * since this is the maximum buffer size we can specify.
3176 */
3177 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
3178 png_size_t length));
3179
3180 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
3181 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
3182 #endif
3183
3184 /* Simple function to write the signature */
3185 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
3186
3187 /* Write various chunks */
3188
3189 /* Write the IHDR chunk, and update the png_struct with the necessary
3190 * information.
3191 */
3192 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
3193 png_uint_32 height,
3194 int bit_depth, int color_type, int compression_method, int filter_method,
3195 int interlace_method));
3196
3197 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
3198 png_uint_32 num_pal));
3199
3200 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
3201 png_size_t length));
3202
3203 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
3204
3205 #if defined(PNG_WRITE_gAMA_SUPPORTED)
3206 #ifdef PNG_FLOATING_POINT_SUPPORTED
3207 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
3208 #endif
3209 #ifdef PNG_FIXED_POINT_SUPPORTED
3210 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
3211 file_gamma));
3212 #endif
3213 #endif
3214
3215 #if defined(PNG_WRITE_sBIT_SUPPORTED)
3216 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
3217 int color_type));
3218 #endif
3219
3220 #if defined(PNG_WRITE_cHRM_SUPPORTED)
3221 #ifdef PNG_FLOATING_POINT_SUPPORTED
3222 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
3223 double white_x, double white_y,
3224 double red_x, double red_y, double green_x, double green_y,
3225 double blue_x, double blue_y));
3226 #endif
3227 #ifdef PNG_FIXED_POINT_SUPPORTED
3228 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
3229 png_fixed_point int_white_x, png_fixed_point int_white_y,
3230 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
3231 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
3232 png_fixed_point int_blue_y));
3233 #endif
3234 #endif
3235
3236 #if defined(PNG_WRITE_sRGB_SUPPORTED)
3237 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
3238 int intent));
3239 #endif
3240
3241 #if defined(PNG_WRITE_iCCP_SUPPORTED)
3242 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
3243 png_charp name, int compression_type,
3244 png_charp profile, int proflen));
3245 /* Note to maintainer: profile should be png_bytep */
3246 #endif
3247
3248 #if defined(PNG_WRITE_sPLT_SUPPORTED)
3249 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
3250 png_sPLT_tp palette));
3251 #endif
3252
3253 #if defined(PNG_WRITE_tRNS_SUPPORTED)
3254 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
3255 png_color_16p values, int number, int color_type));
3256 #endif
3257
3258 #if defined(PNG_WRITE_bKGD_SUPPORTED)
3259 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
3260 png_color_16p values, int color_type));
3261 #endif
3262
3263 #if defined(PNG_WRITE_hIST_SUPPORTED)
3264 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
3265 int num_hist));
3266 #endif
3267
3268 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
3269 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
3270 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
3271 png_charp key, png_charpp new_key));
3272 #endif
3273
3274 #if defined(PNG_WRITE_tEXt_SUPPORTED)
3275 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
3276 png_charp text, png_size_t text_len));
3277 #endif
3278
3279 #if defined(PNG_WRITE_zTXt_SUPPORTED)
3280 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
3281 png_charp text, png_size_t text_len, int compression));
3282 #endif
3283
3284 #if defined(PNG_WRITE_iTXt_SUPPORTED)
3285 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
3286 int compression, png_charp key, png_charp lang, png_charp lang_key,
3287 png_charp text));
3288 #endif
3289
3290 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
3291 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
3292 png_infop info_ptr, png_textp text_ptr, int num_text));
3293 #endif
3294
3295 #if defined(PNG_WRITE_oFFs_SUPPORTED)
3296 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
3297 png_int_32 x_offset, png_int_32 y_offset, int unit_type));
3298 #endif
3299
3300 #if defined(PNG_WRITE_pCAL_SUPPORTED)
3301 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
3302 png_int_32 X0, png_int_32 X1, int type, int nparams,
3303 png_charp units, png_charpp params));
3304 #endif
3305
3306 #if defined(PNG_WRITE_pHYs_SUPPORTED)
3307 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
3308 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
3309 int unit_type));
3310 #endif
3311
3312 #if defined(PNG_WRITE_tIME_SUPPORTED)
3313 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
3314 png_timep mod_time));
3315 #endif
3316
3317 #if defined(PNG_WRITE_sCAL_SUPPORTED)
3318 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
3319 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
3320 int unit, double width, double height));
3321 #else
3322 #ifdef PNG_FIXED_POINT_SUPPORTED
3323 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
3324 int unit, png_charp width, png_charp height));
3325 #endif
3326 #endif
3327 #endif
3328
3329 /* Called when finished processing a row of data */
3330 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
3331
3332 /* Internal use only. Called before first row of data */
3333 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
3334
3335 #if defined(PNG_READ_GAMMA_SUPPORTED)
3336 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
3337 #endif
3338
3339 /* Combine a row of data, dealing with alpha, etc. if requested */
3340 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
3341 int mask));
3342
3343 #if defined(PNG_READ_INTERLACING_SUPPORTED)
3344 /* Expand an interlaced row */
3345 /* OLD pre-1.0.9 interface:
3346 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
3347 png_bytep row, int pass, png_uint_32 transformations));
3348 */
3349 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
3350 #endif
3351
3352 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
3353
3354 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
3355 /* Grab pixels out of a row for an interlaced pass */
3356 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
3357 png_bytep row, int pass));
3358 #endif
3359
3360 /* Unfilter a row */
3361 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
3362 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
3363
3364 /* Choose the best filter to use and filter the row data */
3365 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
3366 png_row_infop row_info));
3367
3368 /* Write out the filtered row. */
3369 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
3370 png_bytep filtered_row));
3371 /* Finish a row while reading, dealing with interlacing passes, etc. */
3372 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
3373
3374 /* Initialize the row buffers, etc. */
3375 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
3376 /* Optional call to update the users info structure */
3377 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
3378 png_infop info_ptr));
3379
3380 /* These are the functions that do the transformations */
3381 #if defined(PNG_READ_FILLER_SUPPORTED)
3382 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
3383 png_bytep row, png_uint_32 filler, png_uint_32 flags));
3384 #endif
3385
3386 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
3387 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
3388 png_bytep row));
3389 #endif
3390
3391 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
3392 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
3393 png_bytep row));
3394 #endif
3395
3396 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
3397 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
3398 png_bytep row));
3399 #endif
3400
3401 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
3402 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
3403 png_bytep row));
3404 #endif
3405
3406 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
3407 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
3408 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
3409 png_bytep row, png_uint_32 flags));
3410 #endif
3411
3412 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
3413 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
3414 #endif
3415
3416 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
3417 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
3418 #endif
3419
3420 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
3421 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
3422 row_info, png_bytep row));
3423 #endif
3424
3425 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
3426 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
3427 png_bytep row));
3428 #endif
3429
3430 #if defined(PNG_READ_PACK_SUPPORTED)
3431 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
3432 #endif
3433
3434 #if defined(PNG_READ_SHIFT_SUPPORTED)
3435 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
3436 png_color_8p sig_bits));
3437 #endif
3438
3439 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
3440 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
3441 #endif
3442
3443 #if defined(PNG_READ_16_TO_8_SUPPORTED)
3444 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
3445 #endif
3446
3447 #if defined(PNG_READ_DITHER_SUPPORTED)
3448 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
3449 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
3450
3451 # if defined(PNG_CORRECT_PALETTE_SUPPORTED)
3452 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
3453 png_colorp palette, int num_palette));
3454 # endif
3455 #endif
3456
3457 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
3458 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
3459 #endif
3460
3461 #if defined(PNG_WRITE_PACK_SUPPORTED)
3462 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
3463 png_bytep row, png_uint_32 bit_depth));
3464 #endif
3465
3466 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
3467 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
3468 png_color_8p bit_depth));
3469 #endif
3470
3471 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
3472 #if defined(PNG_READ_GAMMA_SUPPORTED)
3473 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3474 png_color_16p trans_values, png_color_16p background,
3475 png_color_16p background_1,
3476 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
3477 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
3478 png_uint_16pp gamma_16_to_1, int gamma_shift));
3479 #else
3480 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3481 png_color_16p trans_values, png_color_16p background));
3482 #endif
3483 #endif
3484
3485 #if defined(PNG_READ_GAMMA_SUPPORTED)
3486 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
3487 png_bytep gamma_table, png_uint_16pp gamma_16_table,
3488 int gamma_shift));
3489 #endif
3490
3491 #if defined(PNG_READ_EXPAND_SUPPORTED)
3492 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
3493 png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
3494 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
3495 png_bytep row, png_color_16p trans_value));
3496 #endif
3497
3498 /* The following decodes the appropriate chunks, and does error correction,
3499 * then calls the appropriate callback for the chunk if it is valid.
3500 */
3501
3502 /* Decode the IHDR chunk */
3503 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
3504 png_uint_32 length));
3505 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
3506 png_uint_32 length));
3507 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
3508 png_uint_32 length));
3509
3510 #if defined(PNG_READ_bKGD_SUPPORTED)
3511 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
3512 png_uint_32 length));
3513 #endif
3514
3515 #if defined(PNG_READ_cHRM_SUPPORTED)
3516 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
3517 png_uint_32 length));
3518 #endif
3519
3520 #if defined(PNG_READ_gAMA_SUPPORTED)
3521 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
3522 png_uint_32 length));
3523 #endif
3524
3525 #if defined(PNG_READ_hIST_SUPPORTED)
3526 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
3527 png_uint_32 length));
3528 #endif
3529
3530 #if defined(PNG_READ_iCCP_SUPPORTED)
3531 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
3532 png_uint_32 length));
3533 #endif /* PNG_READ_iCCP_SUPPORTED */
3534
3535 #if defined(PNG_READ_iTXt_SUPPORTED)
3536 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3537 png_uint_32 length));
3538 #endif
3539
3540 #if defined(PNG_READ_oFFs_SUPPORTED)
3541 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
3542 png_uint_32 length));
3543 #endif
3544
3545 #if defined(PNG_READ_pCAL_SUPPORTED)
3546 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3547 png_uint_32 length));
3548 #endif
3549
3550 #if defined(PNG_READ_pHYs_SUPPORTED)
3551 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
3552 png_uint_32 length));
3553 #endif
3554
3555 #if defined(PNG_READ_sBIT_SUPPORTED)
3556 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
3557 png_uint_32 length));
3558 #endif
3559
3560 #if defined(PNG_READ_sCAL_SUPPORTED)
3561 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3562 png_uint_32 length));
3563 #endif
3564
3565 #if defined(PNG_READ_sPLT_SUPPORTED)
3566 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
3567 png_uint_32 length));
3568 #endif /* PNG_READ_sPLT_SUPPORTED */
3569
3570 #if defined(PNG_READ_sRGB_SUPPORTED)
3571 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
3572 png_uint_32 length));
3573 #endif
3574
3575 #if defined(PNG_READ_tEXt_SUPPORTED)
3576 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3577 png_uint_32 length));
3578 #endif
3579
3580 #if defined(PNG_READ_tIME_SUPPORTED)
3581 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
3582 png_uint_32 length));
3583 #endif
3584
3585 #if defined(PNG_READ_tRNS_SUPPORTED)
3586 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
3587 png_uint_32 length));
3588 #endif
3589
3590 #if defined(PNG_READ_zTXt_SUPPORTED)
3591 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3592 png_uint_32 length));
3593 #endif
3594
3595 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
3596 png_infop info_ptr, png_uint_32 length));
3597
3598 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
3599 png_bytep chunk_name));
3600
3601 /* Handle the transformations for reading and writing */
3602 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
3603 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
3604
3605 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
3606
3607 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3608 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
3609 png_infop info_ptr));
3610 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
3611 png_infop info_ptr));
3612 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
3613 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
3614 png_uint_32 length));
3615 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
3616 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
3617 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
3618 png_bytep buffer, png_size_t buffer_length));
3619 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
3620 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
3621 png_bytep buffer, png_size_t buffer_length));
3622 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
3623 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
3624 png_infop info_ptr, png_uint_32 length));
3625 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
3626 png_infop info_ptr));
3627 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
3628 png_infop info_ptr));
3629 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
3630 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
3631 png_infop info_ptr));
3632 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
3633 png_infop info_ptr));
3634 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
3635 #if defined(PNG_READ_tEXt_SUPPORTED)
3636 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
3637 png_infop info_ptr, png_uint_32 length));
3638 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
3639 png_infop info_ptr));
3640 #endif
3641 #if defined(PNG_READ_zTXt_SUPPORTED)
3642 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
3643 png_infop info_ptr, png_uint_32 length));
3644 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
3645 png_infop info_ptr));
3646 #endif
3647 #if defined(PNG_READ_iTXt_SUPPORTED)
3648 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
3649 png_infop info_ptr, png_uint_32 length));
3650 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
3651 png_infop info_ptr));
3652 #endif
3653
3654 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
3655
3656 #ifdef PNG_MNG_FEATURES_SUPPORTED
3657 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
3658 png_bytep row));
3659 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
3660 png_bytep row));
3661 #endif
3662
3663 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
3664 #if defined(PNG_MMX_CODE_SUPPORTED)
3665 /* png.c */ /* PRIVATE */
3666 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
3667 #endif
3668 #endif
3669
3670 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
3671 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
3672 png_infop info_ptr));
3673
3674 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
3675 png_infop info_ptr));
3676
3677 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
3678 png_infop info_ptr));
3679
3680 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
3681 png_infop info_ptr));
3682
3683 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
3684 png_infop info_ptr));
3685
3686 #if defined(PNG_pHYs_SUPPORTED)
3687 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
3688 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
3689 #endif /* PNG_pHYs_SUPPORTED */
3690 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
3691
3692 /* Read the chunk header (length + type name) */
3693 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
3694
3695 /* Added at libpng version 1.2.34 */
3696 #if defined(PNG_cHRM_SUPPORTED)
3697 PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
3698 png_fixed_point int_white_x, png_fixed_point int_white_y,
3699 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
3700 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
3701 png_fixed_point int_blue_y));
3702 #endif
3703
3704 #if defined(PNG_cHRM_SUPPORTED)
3705 #if !defined(PNG_NO_CHECK_cHRM)
3706 /* Added at libpng version 1.2.34 */
3707 PNG_EXTERN void png_64bit_product (long v1, long v2, unsigned long *hi_product,
3708 unsigned long *lo_product);
3709 #endif
3710 #endif
3711
3712 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
3713
3714 #endif /* PNG_INTERNAL */
3715
3716 #ifdef __cplusplus
3717 }
3718 #endif
3719
3720 #endif /* PNG_VERSION_INFO_ONLY */
3721 /* Do not put anything past this line */
3722 #endif /* PNG_H */

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