/[pcsx2_0.9.7]/trunk/3rdparty/wxWidgets/src/png/png.h
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Revision 31 - (hide annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (10 years, 5 months ago) by william
File MIME type: text/plain
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committing r3113 initial commit again...
1 william 31 /* 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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