openshot-audio  0.1.6
png.h
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1 
2 /* png.h - header file for PNG reference library
3  *
4  * libpng version 1.6.1 - March 28, 2013
5  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
6  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
8  *
9  * This code is released under the libpng license (See LICENSE, below)
10  *
11  * Authors and maintainers:
12  * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
13  * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
14  * libpng versions 0.97, January 1998, through 1.6.1 - March 28, 2013: Glenn
15  * See also "Contributing Authors", below.
16  *
17  * Note about libpng version numbers:
18  *
19  * Due to various miscommunications, unforeseen code incompatibilities
20  * and occasional factors outside the authors' control, version numbering
21  * on the library has not always been consistent and straightforward.
22  * The following table summarizes matters since version 0.89c, which was
23  * the first widely used release:
24  *
25  * source png.h png.h shared-lib
26  * version string int version
27  * ------- ------ ----- ----------
28  * 0.89c "1.0 beta 3" 0.89 89 1.0.89
29  * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
30  * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
31  * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
32  * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
33  * 0.97c 0.97 97 2.0.97
34  * 0.98 0.98 98 2.0.98
35  * 0.99 0.99 98 2.0.99
36  * 0.99a-m 0.99 99 2.0.99
37  * 1.00 1.00 100 2.1.0 [100 should be 10000]
38  * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
39  * 1.0.1 png.h string is 10001 2.1.0
40  * 1.0.1a-e identical to the 10002 from here on, the shared library
41  * 1.0.2 source version) 10002 is 2.V where V is the source code
42  * 1.0.2a-b 10003 version, except as noted.
43  * 1.0.3 10003
44  * 1.0.3a-d 10004
45  * 1.0.4 10004
46  * 1.0.4a-f 10005
47  * 1.0.5 (+ 2 patches) 10005
48  * 1.0.5a-d 10006
49  * 1.0.5e-r 10100 (not source compatible)
50  * 1.0.5s-v 10006 (not binary compatible)
51  * 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
52  * 1.0.6d-f 10007 (still binary incompatible)
53  * 1.0.6g 10007
54  * 1.0.6h 10007 10.6h (testing xy.z so-numbering)
55  * 1.0.6i 10007 10.6i
56  * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
57  * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
58  * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
59  * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
60  * 1.0.7 1 10007 (still compatible)
61  * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
62  * 1.0.8rc1 1 10008 2.1.0.8rc1
63  * 1.0.8 1 10008 2.1.0.8
64  * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
65  * 1.0.9rc1 1 10009 2.1.0.9rc1
66  * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
67  * 1.0.9rc2 1 10009 2.1.0.9rc2
68  * 1.0.9 1 10009 2.1.0.9
69  * 1.0.10beta1 1 10010 2.1.0.10beta1
70  * 1.0.10rc1 1 10010 2.1.0.10rc1
71  * 1.0.10 1 10010 2.1.0.10
72  * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
73  * 1.0.11rc1 1 10011 2.1.0.11rc1
74  * 1.0.11 1 10011 2.1.0.11
75  * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
76  * 1.0.12rc1 2 10012 2.1.0.12rc1
77  * 1.0.12 2 10012 2.1.0.12
78  * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
79  * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
80  * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
81  * 1.2.0rc1 3 10200 3.1.2.0rc1
82  * 1.2.0 3 10200 3.1.2.0
83  * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
84  * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
85  * 1.2.1 3 10201 3.1.2.1
86  * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
87  * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
88  * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
89  * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
90  * 1.0.13 10 10013 10.so.0.1.0.13
91  * 1.2.2 12 10202 12.so.0.1.2.2
92  * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
93  * 1.2.3 12 10203 12.so.0.1.2.3
94  * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
95  * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
96  * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
97  * 1.0.14 10 10014 10.so.0.1.0.14
98  * 1.2.4 13 10204 12.so.0.1.2.4
99  * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2
100  * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3
101  * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3
102  * 1.0.15 10 10015 10.so.0.1.0.15
103  * 1.2.5 13 10205 12.so.0.1.2.5
104  * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4
105  * 1.0.16 10 10016 10.so.0.1.0.16
106  * 1.2.6 13 10206 12.so.0.1.2.6
107  * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2
108  * 1.0.17rc1 10 10017 12.so.0.1.0.17rc1
109  * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1
110  * 1.0.17 10 10017 12.so.0.1.0.17
111  * 1.2.7 13 10207 12.so.0.1.2.7
112  * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5
113  * 1.0.18rc1-5 10 10018 12.so.0.1.0.18rc1-5
114  * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5
115  * 1.0.18 10 10018 12.so.0.1.0.18
116  * 1.2.8 13 10208 12.so.0.1.2.8
117  * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3
118  * 1.2.9beta4-11 13 10209 12.so.0.9[.0]
119  * 1.2.9rc1 13 10209 12.so.0.9[.0]
120  * 1.2.9 13 10209 12.so.0.9[.0]
121  * 1.2.10beta1-7 13 10210 12.so.0.10[.0]
122  * 1.2.10rc1-2 13 10210 12.so.0.10[.0]
123  * 1.2.10 13 10210 12.so.0.10[.0]
124  * 1.4.0beta1-5 14 10400 14.so.0.0[.0]
125  * 1.2.11beta1-4 13 10211 12.so.0.11[.0]
126  * 1.4.0beta7-8 14 10400 14.so.0.0[.0]
127  * 1.2.11 13 10211 12.so.0.11[.0]
128  * 1.2.12 13 10212 12.so.0.12[.0]
129  * 1.4.0beta9-14 14 10400 14.so.0.0[.0]
130  * 1.2.13 13 10213 12.so.0.13[.0]
131  * 1.4.0beta15-36 14 10400 14.so.0.0[.0]
132  * 1.4.0beta37-87 14 10400 14.so.14.0[.0]
133  * 1.4.0rc01 14 10400 14.so.14.0[.0]
134  * 1.4.0beta88-109 14 10400 14.so.14.0[.0]
135  * 1.4.0rc02-08 14 10400 14.so.14.0[.0]
136  * 1.4.0 14 10400 14.so.14.0[.0]
137  * 1.4.1beta01-03 14 10401 14.so.14.1[.0]
138  * 1.4.1rc01 14 10401 14.so.14.1[.0]
139  * 1.4.1beta04-12 14 10401 14.so.14.1[.0]
140  * 1.4.1 14 10401 14.so.14.1[.0]
141  * 1.4.2 14 10402 14.so.14.2[.0]
142  * 1.4.3 14 10403 14.so.14.3[.0]
143  * 1.4.4 14 10404 14.so.14.4[.0]
144  * 1.5.0beta01-58 15 10500 15.so.15.0[.0]
145  * 1.5.0rc01-07 15 10500 15.so.15.0[.0]
146  * 1.5.0 15 10500 15.so.15.0[.0]
147  * 1.5.1beta01-11 15 10501 15.so.15.1[.0]
148  * 1.5.1rc01-02 15 10501 15.so.15.1[.0]
149  * 1.5.1 15 10501 15.so.15.1[.0]
150  * 1.5.2beta01-03 15 10502 15.so.15.2[.0]
151  * 1.5.2rc01-03 15 10502 15.so.15.2[.0]
152  * 1.5.2 15 10502 15.so.15.2[.0]
153  * 1.5.3beta01-10 15 10503 15.so.15.3[.0]
154  * 1.5.3rc01-02 15 10503 15.so.15.3[.0]
155  * 1.5.3beta11 15 10503 15.so.15.3[.0]
156  * 1.5.3 [omitted]
157  * 1.5.4beta01-08 15 10504 15.so.15.4[.0]
158  * 1.5.4rc01 15 10504 15.so.15.4[.0]
159  * 1.5.4 15 10504 15.so.15.4[.0]
160  * 1.5.5beta01-08 15 10505 15.so.15.5[.0]
161  * 1.5.5rc01 15 10505 15.so.15.5[.0]
162  * 1.5.5 15 10505 15.so.15.5[.0]
163  * 1.5.6beta01-07 15 10506 15.so.15.6[.0]
164  * 1.5.6rc01-03 15 10506 15.so.15.6[.0]
165  * 1.5.6 15 10506 15.so.15.6[.0]
166  * 1.5.7beta01-05 15 10507 15.so.15.7[.0]
167  * 1.5.7rc01-03 15 10507 15.so.15.7[.0]
168  * 1.5.7 15 10507 15.so.15.7[.0]
169  * 1.6.0beta01-40 16 10600 16.so.16.0[.0]
170  * 1.6.0rc01-08 16 10600 16.so.16.0[.0]
171  * 1.6.0 16 10600 16.so.16.0[.0]
172  * 1.6.1beta01-10 16 10601 16.so.16.1[.0]
173  * 1.6.1rc01 16 10601 16.so.16.1[.0]
174  * 1.6.1 16 10601 16.so.16.1[.0]
175  *
176  * Henceforth the source version will match the shared-library major
177  * and minor numbers; the shared-library major version number will be
178  * used for changes in backward compatibility, as it is intended. The
179  * PNG_LIBPNG_VER macro, which is not used within libpng but is available
180  * for applications, is an unsigned integer of the form xyyzz corresponding
181  * to the source version x.y.z (leading zeros in y and z). Beta versions
182  * were given the previous public release number plus a letter, until
183  * version 1.0.6j; from then on they were given the upcoming public
184  * release number plus "betaNN" or "rcNN".
185  *
186  * Binary incompatibility exists only when applications make direct access
187  * to the info_ptr or png_ptr members through png.h, and the compiled
188  * application is loaded with a different version of the library.
189  *
190  * DLLNUM will change each time there are forward or backward changes
191  * in binary compatibility (e.g., when a new feature is added).
192  *
193  * See libpng-manual.txt or libpng.3 for more information. The PNG
194  * specification is available as a W3C Recommendation and as an ISO
195  * Specification, <http://www.w3.org/TR/2003/REC-PNG-20031110/
196  */
197 
198 /*
199  * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
200  *
201  * If you modify libpng you may insert additional notices immediately following
202  * this sentence.
203  *
204  * This code is released under the libpng license.
205  *
206  * libpng versions 1.2.6, August 15, 2004, through 1.6.1, March 28, 2013, are
207  * Copyright (c) 2004, 2006-2013 Glenn Randers-Pehrson, and are
208  * distributed according to the same disclaimer and license as libpng-1.2.5
209  * with the following individual added to the list of Contributing Authors:
210  *
211  * Cosmin Truta
212  *
213  * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
214  * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
215  * distributed according to the same disclaimer and license as libpng-1.0.6
216  * with the following individuals added to the list of Contributing Authors:
217  *
218  * Simon-Pierre Cadieux
219  * Eric S. Raymond
220  * Gilles Vollant
221  *
222  * and with the following additions to the disclaimer:
223  *
224  * There is no warranty against interference with your enjoyment of the
225  * library or against infringement. There is no warranty that our
226  * efforts or the library will fulfill any of your particular purposes
227  * or needs. This library is provided with all faults, and the entire
228  * risk of satisfactory quality, performance, accuracy, and effort is with
229  * the user.
230  *
231  * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
232  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
233  * distributed according to the same disclaimer and license as libpng-0.96,
234  * with the following individuals added to the list of Contributing Authors:
235  *
236  * Tom Lane
237  * Glenn Randers-Pehrson
238  * Willem van Schaik
239  *
240  * libpng versions 0.89, June 1996, through 0.96, May 1997, are
241  * Copyright (c) 1996, 1997 Andreas Dilger
242  * Distributed according to the same disclaimer and license as libpng-0.88,
243  * with the following individuals added to the list of Contributing Authors:
244  *
245  * John Bowler
246  * Kevin Bracey
247  * Sam Bushell
248  * Magnus Holmgren
249  * Greg Roelofs
250  * Tom Tanner
251  *
252  * libpng versions 0.5, May 1995, through 0.88, January 1996, are
253  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
254  *
255  * For the purposes of this copyright and license, "Contributing Authors"
256  * is defined as the following set of individuals:
257  *
258  * Andreas Dilger
259  * Dave Martindale
260  * Guy Eric Schalnat
261  * Paul Schmidt
262  * Tim Wegner
263  *
264  * The PNG Reference Library is supplied "AS IS". The Contributing Authors
265  * and Group 42, Inc. disclaim all warranties, expressed or implied,
266  * including, without limitation, the warranties of merchantability and of
267  * fitness for any purpose. The Contributing Authors and Group 42, Inc.
268  * assume no liability for direct, indirect, incidental, special, exemplary,
269  * or consequential damages, which may result from the use of the PNG
270  * Reference Library, even if advised of the possibility of such damage.
271  *
272  * Permission is hereby granted to use, copy, modify, and distribute this
273  * source code, or portions hereof, for any purpose, without fee, subject
274  * to the following restrictions:
275  *
276  * 1. The origin of this source code must not be misrepresented.
277  *
278  * 2. Altered versions must be plainly marked as such and must not
279  * be misrepresented as being the original source.
280  *
281  * 3. This Copyright notice may not be removed or altered from
282  * any source or altered source distribution.
283  *
284  * The Contributing Authors and Group 42, Inc. specifically permit, without
285  * fee, and encourage the use of this source code as a component to
286  * supporting the PNG file format in commercial products. If you use this
287  * source code in a product, acknowledgment is not required but would be
288  * appreciated.
289  */
290 
291 /*
292  * A "png_get_copyright" function is available, for convenient use in "about"
293  * boxes and the like:
294  *
295  * printf("%s", png_get_copyright(NULL));
296  *
297  * Also, the PNG logo (in PNG format, of course) is supplied in the
298  * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
299  */
300 
301 /*
302  * Libpng is OSI Certified Open Source Software. OSI Certified is a
303  * certification mark of the Open Source Initiative.
304  */
305 
306 /*
307  * The contributing authors would like to thank all those who helped
308  * with testing, bug fixes, and patience. This wouldn't have been
309  * possible without all of you.
310  *
311  * Thanks to Frank J. T. Wojcik for helping with the documentation.
312  */
313 
314 /*
315  * Y2K compliance in libpng:
316  * =========================
317  *
318  * March 28, 2013
319  *
320  * Since the PNG Development group is an ad-hoc body, we can't make
321  * an official declaration.
322  *
323  * This is your unofficial assurance that libpng from version 0.71 and
324  * upward through 1.6.1 are Y2K compliant. It is my belief that
325  * earlier versions were also Y2K compliant.
326  *
327  * Libpng only has two year fields. One is a 2-byte unsigned integer
328  * that will hold years up to 65535. The other, which is deprecated,
329  * holds the date in text format, and will hold years up to 9999.
330  *
331  * The integer is
332  * "png_uint_16 year" in png_time_struct.
333  *
334  * The string is
335  * "char time_buffer[29]" in png_struct. This is no longer used
336  * in libpng-1.6.x and will be removed from libpng-1.7.0.
337  *
338  * There are seven time-related functions:
339  * png.c: png_convert_to_rfc_1123_buffer() in png.c
340  * (formerly png_convert_to_rfc_1123() prior to libpng-1.5.x and
341  * png_convert_to_rfc_1152() in error prior to libpng-0.98)
342  * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
343  * png_convert_from_time_t() in pngwrite.c
344  * png_get_tIME() in pngget.c
345  * png_handle_tIME() in pngrutil.c, called in pngread.c
346  * png_set_tIME() in pngset.c
347  * png_write_tIME() in pngwutil.c, called in pngwrite.c
348  *
349  * All handle dates properly in a Y2K environment. The
350  * png_convert_from_time_t() function calls gmtime() to convert from system
351  * clock time, which returns (year - 1900), which we properly convert to
352  * the full 4-digit year. There is a possibility that libpng applications
353  * are not passing 4-digit years into the png_convert_to_rfc_1123_buffer()
354  * function, or that they are incorrectly passing only a 2-digit year
355  * instead of "year - 1900" into the png_convert_from_struct_tm() function,
356  * but this is not under our control. The libpng documentation has always
357  * stated that it works with 4-digit years, and the APIs have been
358  * documented as such.
359  *
360  * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
361  * integer to hold the year, and can hold years as large as 65535.
362  *
363  * zlib, upon which libpng depends, is also Y2K compliant. It contains
364  * no date-related code.
365  *
366  * Glenn Randers-Pehrson
367  * libpng maintainer
368  * PNG Development Group
369  */
370 
371 #ifndef PNG_H
372 #define PNG_H
373 
374 /* This is not the place to learn how to use libpng. The file libpng-manual.txt
375  * describes how to use libpng, and the file example.c summarizes it
376  * with some code on which to build. This file is useful for looking
377  * at the actual function definitions and structure components.
378  *
379  * If you just need to read a PNG file and don't want to read the documentation
380  * skip to the end of this file and read the section entitled 'simplified API'.
381  */
382 
383 /* Version information for png.h - this should match the version in png.c */
384 #define PNG_LIBPNG_VER_STRING "1.6.1"
385 #define PNG_HEADER_VERSION_STRING \
386  " libpng version 1.6.1 - March 28, 2013\n"
387 
388 #define PNG_LIBPNG_VER_SONUM 16
389 #define PNG_LIBPNG_VER_DLLNUM 16
390 
391 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
392 #define PNG_LIBPNG_VER_MAJOR 1
393 #define PNG_LIBPNG_VER_MINOR 6
394 #define PNG_LIBPNG_VER_RELEASE 1
395 
396 /* This should match the numeric part of the final component of
397  * PNG_LIBPNG_VER_STRING, omitting any leading zero:
398  */
399 
400 #define PNG_LIBPNG_VER_BUILD 0
401 
402 /* Release Status */
403 #define PNG_LIBPNG_BUILD_ALPHA 1
404 #define PNG_LIBPNG_BUILD_BETA 2
405 #define PNG_LIBPNG_BUILD_RC 3
406 #define PNG_LIBPNG_BUILD_STABLE 4
407 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
408 
409 /* Release-Specific Flags */
410 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
411  PNG_LIBPNG_BUILD_STABLE only */
412 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
413  PNG_LIBPNG_BUILD_SPECIAL */
414 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
415  PNG_LIBPNG_BUILD_PRIVATE */
416 
417 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
418 
419 /* Careful here. At one time, Guy wanted to use 082, but that would be octal.
420  * We must not include leading zeros.
421  * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
422  * version 1.0.0 was mis-numbered 100 instead of 10000). From
423  * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release
424  */
425 #define PNG_LIBPNG_VER 10601 /* 1.6.1 */
426 
427 /* Library configuration: these options cannot be changed after
428  * the library has been built.
429  */
430 #ifndef PNGLCONF_H
431  /* If pnglibconf.h is missing, you can
432  * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h
433  */
434 # include "pnglibconf.h"
435 #endif
436 
437 #ifndef PNG_VERSION_INFO_ONLY
438  /* Machine specific configuration. */
439 # include "pngconf.h"
440 #endif
441 
442 /*
443  * Added at libpng-1.2.8
444  *
445  * Ref MSDN: Private as priority over Special
446  * VS_FF_PRIVATEBUILD File *was not* built using standard release
447  * procedures. If this value is given, the StringFileInfo block must
448  * contain a PrivateBuild string.
449  *
450  * VS_FF_SPECIALBUILD File *was* built by the original company using
451  * standard release procedures but is a variation of the standard
452  * file of the same version number. If this value is given, the
453  * StringFileInfo block must contain a SpecialBuild string.
454  */
455 
456 #ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */
457 # define PNG_LIBPNG_BUILD_TYPE \
458  (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
459 #else
460 # ifdef PNG_LIBPNG_SPECIALBUILD
461 # define PNG_LIBPNG_BUILD_TYPE \
462  (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
463 # else
464 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
465 # endif
466 #endif
467 
468 #ifndef PNG_VERSION_INFO_ONLY
469 
470 /* Version information for C files, stored in png.c. This had better match
471  * the version above.
472  */
473 #define png_libpng_ver png_get_header_ver(NULL)
474 
475 /* This file is arranged in several sections:
476  *
477  * 1. Any configuration options that can be specified by for the application
478  * code when it is built. (Build time configuration is in pnglibconf.h)
479  * 2. Type definitions (base types are defined in pngconf.h), structure
480  * definitions.
481  * 3. Exported library functions.
482  * 4. Simplified API.
483  *
484  * The library source code has additional files (principally pngpriv.h) that
485  * allow configuration of the library.
486  */
487 /* Section 1: run time configuration
488  * See pnglibconf.h for build time configuration
489  *
490  * Run time configuration allows the application to choose between
491  * implementations of certain arithmetic APIs. The default is set
492  * at build time and recorded in pnglibconf.h, but it is safe to
493  * override these (and only these) settings. Note that this won't
494  * change what the library does, only application code, and the
495  * settings can (and probably should) be made on a per-file basis
496  * by setting the #defines before including png.h
497  *
498  * Use macros to read integers from PNG data or use the exported
499  * functions?
500  * PNG_USE_READ_MACROS: use the macros (see below) Note that
501  * the macros evaluate their argument multiple times.
502  * PNG_NO_USE_READ_MACROS: call the relevant library function.
503  *
504  * Use the alternative algorithm for compositing alpha samples that
505  * does not use division?
506  * PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division'
507  * algorithm.
508  * PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm.
509  *
510  * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is
511  * false?
512  * PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error
513  * APIs to png_warning.
514  * Otherwise the calls are mapped to png_error.
515  */
516 
517 /* Section 2: type definitions, including structures and compile time
518  * constants.
519  * See pngconf.h for base types that vary by machine/system
520  */
521 
522 /* This triggers a compiler error in png.c, if png.c and png.h
523  * do not agree upon the version number.
524  */
526 
527 /* Basic control structions. Read libpng-manual.txt or libpng.3 for more info.
528  *
529  * png_struct is the cache of information used while reading or writing a single
530  * PNG file. One of these is always required, although the simplified API
531  * (below) hides the creation and destruction of it.
532  */
533 typedef struct png_struct_def png_struct;
537 
538 /* png_info contains information read from or to be written to a PNG file. One
539  * or more of these must exist while reading or creating a PNG file. The
540  * information is not used by libpng during read but is used to control what
541  * gets written when a PNG file is created. "png_get_" function calls read
542  * information during read and "png_set_" functions calls write information
543  * when creating a PNG.
544  * been moved into a separate header file that is not accessible to
545  * applications. Read libpng-manual.txt or libpng.3 for more info.
546  */
547 typedef struct png_info_def png_info;
548 typedef png_info * png_infop;
549 typedef const png_info * png_const_infop;
550 typedef png_info * * png_infopp;
551 
552 /* Types with names ending 'p' are pointer types. The corresponding types with
553  * names ending 'rp' are identical pointer types except that the pointer is
554  * marked 'restrict', which means that it is the only pointer to the object
555  * passed to the function. Applications should not use the 'restrict' types;
556  * it is always valid to pass 'p' to a pointer with a function argument of the
557  * corresponding 'rp' type. Different compilers have different rules with
558  * regard to type matching in the presence of 'restrict'. For backward
559  * compatibility libpng callbacks never have 'restrict' in their parameters and,
560  * consequentially, writing portable application code is extremely difficult if
561  * an attempt is made to use 'restrict'.
562  */
567 
568 /* Three color definitions. The order of the red, green, and blue, (and the
569  * exact size) is not important, although the size of the fields need to
570  * be png_byte or png_uint_16 (as defined below).
571  */
572 typedef struct png_color_struct
573 {
574  png_byte red;
575  png_byte green;
576  png_byte blue;
577 } png_color;
579 typedef const png_color * png_const_colorp;
580 typedef png_color * * png_colorpp;
581 
582 typedef struct png_color_16_struct
583 {
584  png_byte index; /* used for palette files */
585  png_uint_16 red; /* for use in red green blue files */
588  png_uint_16 gray; /* for use in grayscale files */
589 } png_color_16;
593 
594 typedef struct png_color_8_struct
595 {
596  png_byte red; /* for use in red green blue files */
597  png_byte green;
598  png_byte blue;
599  png_byte gray; /* for use in grayscale files */
600  png_byte alpha; /* for alpha channel files */
601 } png_color_8;
605 
606 /*
607  * The following two structures are used for the in-core representation
608  * of sPLT chunks.
609  */
610 typedef struct png_sPLT_entry_struct
611 {
621 
622 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples
623  * occupy the LSB of their respective members, and the MSB of each member
624  * is zero-filled. The frequency member always occupies the full 16 bits.
625  */
626 
627 typedef struct png_sPLT_struct
628 {
629  png_charp name; /* palette name */
630  png_byte depth; /* depth of palette samples */
631  png_sPLT_entryp entries; /* palette entries */
632  png_int_32 nentries; /* number of palette entries */
633 } png_sPLT_t;
637 
638 #ifdef PNG_TEXT_SUPPORTED
639 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
640  * and whether that contents is compressed or not. The "key" field
641  * points to a regular zero-terminated C string. The "text" fields can be a
642  * regular C string, an empty string, or a NULL pointer.
643  * However, the structure returned by png_get_text() will always contain
644  * the "text" field as a regular zero-terminated C string (possibly
645  * empty), never a NULL pointer, so it can be safely used in printf() and
646  * other string-handling functions. Note that the "itxt_length", "lang", and
647  * "lang_key" members of the structure only exist when the library is built
648  * with iTXt chunk support. Prior to libpng-1.4.0 the library was built by
649  * default without iTXt support. Also note that when iTXt *is* supported,
650  * the "lang" and "lang_key" fields contain NULL pointers when the
651  * "compression" field contains * PNG_TEXT_COMPRESSION_NONE or
652  * PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the
653  * same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag"
654  * which is always 0 or 1, or its "compression method" which is always 0.
655  */
656 typedef struct png_text_struct
657 {
658  int compression; /* compression value:
659  -1: tEXt, none
660  0: zTXt, deflate
661  1: iTXt, none
662  2: iTXt, deflate */
663  png_charp key; /* keyword, 1-79 character description of "text" */
664  png_charp text; /* comment, may be an empty string (ie "")
665  or a NULL pointer */
666  png_size_t text_length; /* length of the text string */
667  png_size_t itxt_length; /* length of the itxt string */
668  png_charp lang; /* language code, 0-79 characters
669  or a NULL pointer */
670  png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
671  chars or a NULL pointer */
672 } png_text;
673 typedef png_text * png_textp;
674 typedef const png_text * png_const_textp;
675 typedef png_text * * png_textpp;
676 #endif
677 
678 /* Supported compression types for text in PNG files (tEXt, and zTXt).
679  * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
680 #define PNG_TEXT_COMPRESSION_NONE_WR -3
681 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
682 #define PNG_TEXT_COMPRESSION_NONE -1
683 #define PNG_TEXT_COMPRESSION_zTXt 0
684 #define PNG_ITXT_COMPRESSION_NONE 1
685 #define PNG_ITXT_COMPRESSION_zTXt 2
686 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
687 
688 /* png_time is a way to hold the time in an machine independent way.
689  * Two conversions are provided, both from time_t and struct tm. There
690  * is no portable way to convert to either of these structures, as far
691  * as I know. If you know of a portable way, send it to me. As a side
692  * note - PNG has always been Year 2000 compliant!
693  */
694 typedef struct png_time_struct
695 {
696  png_uint_16 year; /* full year, as in, 1995 */
697  png_byte month; /* month of year, 1 - 12 */
698  png_byte day; /* day of month, 1 - 31 */
699  png_byte hour; /* hour of day, 0 - 23 */
700  png_byte minute; /* minute of hour, 0 - 59 */
701  png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
702 } png_time;
703 typedef png_time * png_timep;
704 typedef const png_time * png_const_timep;
705 typedef png_time * * png_timepp;
706 
707 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
708 /* png_unknown_chunk is a structure to hold queued chunks for which there is
709  * no specific support. The idea is that we can use this to queue
710  * up private chunks for output even though the library doesn't actually
711  * know about their semantics.
712  *
713  * The data in the structure is set by libpng on read and used on write.
714  */
715 typedef struct png_unknown_chunk_t
716 {
717  png_byte name[5]; /* Textual chunk name with '\0' terminator */
718  png_byte *data; /* Data, should not be modified on read! */
719  png_size_t size;
720 
721  /* On write 'location' must be set using the flag values listed below.
722  * Notice that on read it is set by libpng however the values stored have
723  * more bits set than are listed below. Always treat the value as a
724  * bitmask. On write set only one bit - setting multiple bits may cause the
725  * chunk to be written in multiple places.
726  */
727  png_byte location; /* mode of operation at read time */
728 }
730 
734 #endif
735 
736 /* Flag values for the unknown chunk location byte. */
737 #define PNG_HAVE_IHDR 0x01
738 #define PNG_HAVE_PLTE 0x02
739 #define PNG_AFTER_IDAT 0x08
740 
741 /* Maximum positive integer used in PNG is (2^31)-1 */
742 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
743 #define PNG_UINT_32_MAX ((png_uint_32)(-1))
744 #define PNG_SIZE_MAX ((png_size_t)(-1))
745 
746 /* These are constants for fixed point values encoded in the
747  * PNG specification manner (x100000)
748  */
749 #define PNG_FP_1 100000
750 #define PNG_FP_HALF 50000
751 #define PNG_FP_MAX ((png_fixed_point)0x7fffffffL)
752 #define PNG_FP_MIN (-PNG_FP_MAX)
753 
754 /* These describe the color_type field in png_info. */
755 /* color type masks */
756 #define PNG_COLOR_MASK_PALETTE 1
757 #define PNG_COLOR_MASK_COLOR 2
758 #define PNG_COLOR_MASK_ALPHA 4
759 
760 /* color types. Note that not all combinations are legal */
761 #define PNG_COLOR_TYPE_GRAY 0
762 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
763 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
764 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
765 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
766 /* aliases */
767 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
768 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
769 
770 /* This is for compression type. PNG 1.0-1.2 only define the single type. */
771 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
772 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
773 
774 /* This is for filter type. PNG 1.0-1.2 only define the single type. */
775 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
776 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
777 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
778 
779 /* These are for the interlacing type. These values should NOT be changed. */
780 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
781 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
782 #define PNG_INTERLACE_LAST 2 /* Not a valid value */
783 
784 /* These are for the oFFs chunk. These values should NOT be changed. */
785 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
786 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
787 #define PNG_OFFSET_LAST 2 /* Not a valid value */
788 
789 /* These are for the pCAL chunk. These values should NOT be changed. */
790 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */
791 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
792 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
793 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
794 #define PNG_EQUATION_LAST 4 /* Not a valid value */
795 
796 /* These are for the sCAL chunk. These values should NOT be changed. */
797 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
798 #define PNG_SCALE_METER 1 /* meters per pixel */
799 #define PNG_SCALE_RADIAN 2 /* radians per pixel */
800 #define PNG_SCALE_LAST 3 /* Not a valid value */
801 
802 /* These are for the pHYs chunk. These values should NOT be changed. */
803 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
804 #define PNG_RESOLUTION_METER 1 /* pixels/meter */
805 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */
806 
807 /* These are for the sRGB chunk. These values should NOT be changed. */
808 #define PNG_sRGB_INTENT_PERCEPTUAL 0
809 #define PNG_sRGB_INTENT_RELATIVE 1
810 #define PNG_sRGB_INTENT_SATURATION 2
811 #define PNG_sRGB_INTENT_ABSOLUTE 3
812 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
813 
814 /* This is for text chunks */
815 #define PNG_KEYWORD_MAX_LENGTH 79
816 
817 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */
818 #define PNG_MAX_PALETTE_LENGTH 256
819 
820 /* These determine if an ancillary chunk's data has been successfully read
821  * from the PNG header, or if the application has filled in the corresponding
822  * data in the info_struct to be written into the output file. The values
823  * of the PNG_INFO_<chunk> defines should NOT be changed.
824  */
825 #define PNG_INFO_gAMA 0x0001
826 #define PNG_INFO_sBIT 0x0002
827 #define PNG_INFO_cHRM 0x0004
828 #define PNG_INFO_PLTE 0x0008
829 #define PNG_INFO_tRNS 0x0010
830 #define PNG_INFO_bKGD 0x0020
831 #define PNG_INFO_hIST 0x0040
832 #define PNG_INFO_pHYs 0x0080
833 #define PNG_INFO_oFFs 0x0100
834 #define PNG_INFO_tIME 0x0200
835 #define PNG_INFO_pCAL 0x0400
836 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
837 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
838 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
839 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
840 #define PNG_INFO_IDAT 0x8000 /* ESR, 1.0.6 */
841 
842 /* This is used for the transformation routines, as some of them
843  * change these values for the row. It also should enable using
844  * the routines for other purposes.
845  */
846 typedef struct png_row_info_struct
847 {
848  png_uint_32 width; /* width of row */
849  png_size_t rowbytes; /* number of bytes in row */
850  png_byte color_type; /* color type of row */
851  png_byte bit_depth; /* bit depth of row */
852  png_byte channels; /* number of channels (1, 2, 3, or 4) */
853  png_byte pixel_depth; /* bits per pixel (depth * channels) */
854 } png_row_info;
855 
858 
859 /* These are the function types for the I/O functions and for the functions
860  * that allow the user to override the default I/O functions with his or her
861  * own. The png_error_ptr type should match that of user-supplied warning
862  * and error functions, while the png_rw_ptr type should match that of the
863  * user read/write data functions. Note that the 'write' function must not
864  * modify the buffer it is passed. The 'read' function, on the other hand, is
865  * expected to return the read data in the buffer.
866  */
867 typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp));
868 typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t));
869 typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp));
870 typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32,
871  int));
872 typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32,
873  int));
874 
875 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
876 typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop));
877 typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop));
878 
879 /* The following callback receives png_uint_32 row_number, int pass for the
880  * png_bytep data of the row. When transforming an interlaced image the
881  * row number is the row number within the sub-image of the interlace pass, so
882  * the value will increase to the height of the sub-image (not the full image)
883  * then reset to 0 for the next pass.
884  *
885  * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
886  * find the output pixel (x,y) given an interlaced sub-image pixel
887  * (row,col,pass). (See below for these macros.)
888  */
889 typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep,
890  png_uint_32, int));
891 #endif
892 
893 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
894  defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
895 typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop,
896  png_bytep));
897 #endif
898 
899 #ifdef PNG_USER_CHUNKS_SUPPORTED
900 typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp,
902 #endif
903 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
904 /* not used anywhere */
905 /* typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp)); */
906 #endif
907 
908 #ifdef PNG_SETJMP_SUPPORTED
909 /* This must match the function definition in <setjmp.h>, and the application
910  * must include this before png.h to obtain the definition of jmp_buf. The
911  * function is required to be PNG_NORETURN, but this is not checked. If the
912  * function does return the application will crash via an abort() or similar
913  * system level call.
914  *
915  * If you get a warning here while building the library you may need to make
916  * changes to ensure that pnglibconf.h records the calling convention used by
917  * your compiler. This may be very difficult - try using a different compiler
918  * to build the library!
919  */
920 PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef);
921 #endif
922 
923 /* Transform masks for the high-level interface */
924 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
925 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
926 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
927 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
928 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
929 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
930 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
931 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
932 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */
933 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
934 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
935 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
936 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only */
937 /* Added to libpng-1.2.34 */
938 #define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER
939 #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */
940 /* Added to libpng-1.4.0 */
941 #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */
942 /* Added to libpng-1.5.4 */
943 #define PNG_TRANSFORM_EXPAND_16 0x4000 /* read only */
944 #define PNG_TRANSFORM_SCALE_16 0x8000 /* read only */
945 
946 /* Flags for MNG supported features */
947 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01
948 #define PNG_FLAG_MNG_FILTER_64 0x04
949 #define PNG_ALL_MNG_FEATURES 0x05
950 
951 /* NOTE: prior to 1.5 these functions had no 'API' style declaration,
952  * this allowed the zlib default functions to be used on Windows
953  * platforms. In 1.5 the zlib default malloc (which just calls malloc and
954  * ignores the first argument) should be completely compatible with the
955  * following.
956  */
957 typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp,
959 typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp));
960 
961 /* Section 3: exported functions
962  * Here are the function definitions most commonly used. This is not
963  * the place to find out how to use libpng. See libpng-manual.txt for the
964  * full explanation, see example.c for the summary. This just provides
965  * a simple one line description of the use of each function.
966  *
967  * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in
968  * pngconf.h and in the *.dfn files in the scripts directory.
969  *
970  * PNG_EXPORT(ordinal, type, name, (args));
971  *
972  * ordinal: ordinal that is used while building
973  * *.def files. The ordinal value is only
974  * relevant when preprocessing png.h with
975  * the *.dfn files for building symbol table
976  * entries, and are removed by pngconf.h.
977  * type: return type of the function
978  * name: function name
979  * args: function arguments, with types
980  *
981  * When we wish to append attributes to a function prototype we use
982  * the PNG_EXPORTA() macro instead.
983  *
984  * PNG_EXPORTA(ordinal, type, name, (args), attributes);
985  *
986  * ordinal, type, name, and args: same as in PNG_EXPORT().
987  * attributes: function attributes
988  */
989 
990 /* Returns the version number of the library */
992 
993 /* Tell lib we have already handled the first <num_bytes> magic bytes.
994  * Handling more than 8 bytes from the beginning of the file is an error.
995  */
996 PNG_EXPORT(2, void, png_set_sig_bytes, (png_structrp png_ptr, int num_bytes));
997 
998 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
999  * PNG file. Returns zero if the supplied bytes match the 8-byte PNG
1000  * signature, and non-zero otherwise. Having num_to_check == 0 or
1001  * start > 7 will always fail (ie return non-zero).
1002  */
1003 PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start,
1004  png_size_t num_to_check));
1005 
1006 /* Simple signature checking function. This is the same as calling
1007  * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1008  */
1009 #define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n))
1010 
1011 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
1012 PNG_EXPORTA(4, png_structp, png_create_read_struct,
1013  (png_const_charp user_png_ver, png_voidp error_ptr,
1014  png_error_ptr error_fn, png_error_ptr warn_fn),
1015  PNG_ALLOCATED);
1016 
1017 /* Allocate and initialize png_ptr struct for writing, and any other memory */
1018 PNG_EXPORTA(5, png_structp, png_create_write_struct,
1019  (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
1020  png_error_ptr warn_fn),
1021  PNG_ALLOCATED);
1022 
1025 
1027  png_size_t size));
1028 
1029 /* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp
1030  * match up.
1031  */
1032 #ifdef PNG_SETJMP_SUPPORTED
1033 /* This function returns the jmp_buf built in to *png_ptr. It must be
1034  * supplied with an appropriate 'longjmp' function to use on that jmp_buf
1035  * unless the default error function is overridden in which case NULL is
1036  * acceptable. The size of the jmp_buf is checked against the actual size
1037  * allocated by the library - the call will return NULL on a mismatch
1038  * indicating an ABI mismatch.
1039  */
1040 PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structrp png_ptr,
1041  png_longjmp_ptr longjmp_fn, size_t jmp_buf_size));
1042 # define png_jmpbuf(png_ptr) \
1043  (*png_set_longjmp_fn((png_ptr), longjmp, (sizeof (jmp_buf))))
1044 #else
1045 # define png_jmpbuf(png_ptr) \
1046  (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP)
1047 #endif
1048 /* This function should be used by libpng applications in place of
1049  * longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it
1050  * will use it; otherwise it will call PNG_ABORT(). This function was
1051  * added in libpng-1.5.0.
1052  */
1053 PNG_EXPORTA(9, void, png_longjmp, (png_const_structrp png_ptr, int val),
1054  PNG_NORETURN);
1055 
1056 #ifdef PNG_READ_SUPPORTED
1057 /* Reset the compression stream */
1059 #endif
1060 
1061 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1062 #ifdef PNG_USER_MEM_SUPPORTED
1063 PNG_EXPORTA(11, png_structp, png_create_read_struct_2,
1064  (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
1065  png_error_ptr warn_fn,
1066  png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
1067  PNG_ALLOCATED);
1068 PNG_EXPORTA(12, png_structp, png_create_write_struct_2,
1069  (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
1070  png_error_ptr warn_fn,
1071  png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
1072  PNG_ALLOCATED);
1073 #endif
1074 
1075 /* Write the PNG file signature. */
1077 
1078 /* Write a PNG chunk - size, type, (optional) data, CRC. */
1080  chunk_name, png_const_bytep data, png_size_t length));
1081 
1082 /* Write the start of a PNG chunk - length and chunk name. */
1084  png_const_bytep chunk_name, png_uint_32 length));
1085 
1086 /* Write the data of a PNG chunk started with png_write_chunk_start(). */
1089 
1090 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1092 
1093 /* Allocate and initialize the info structure */
1094 PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_const_structrp png_ptr),
1095  PNG_ALLOCATED);
1096 
1097 /* DEPRECATED: this function allowed init structures to be created using the
1098  * default allocation method (typically malloc). Use is deprecated in 1.6.0 and
1099  * the API will be removed in the future.
1100  */
1101 PNG_EXPORTA(19, void, png_info_init_3, (png_infopp info_ptr,
1102  png_size_t png_info_struct_size), PNG_DEPRECATED);
1103 
1104 /* Writes all the PNG information before the image. */
1107 PNG_EXPORT(21, void, png_write_info,
1109 
1110 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1111 /* Read the information before the actual image data. */
1112 PNG_EXPORT(22, void, png_read_info,
1114 #endif
1115 
1116 #ifdef PNG_TIME_RFC1123_SUPPORTED
1117  /* Convert to a US string format: there is no localization support in this
1118  * routine. The original implementation used a 29 character buffer in
1119  * png_struct, this will be removed in future versions.
1120  */
1121 #if PNG_LIBPNG_VER < 10700
1122 /* To do: remove this from libpng17 (and from libpng17/png.c and pngstruct.h) */
1125 #endif
1126 PNG_EXPORT(241, int, png_convert_to_rfc1123_buffer, (char out[29],
1127  png_const_timep ptime));
1128 #endif
1129 
1130 #ifdef PNG_CONVERT_tIME_SUPPORTED
1131 /* Convert from a struct tm to png_time */
1132 PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime,
1133  const struct tm * ttime));
1134 
1135 /* Convert from time_t to png_time. Uses gmtime() */
1136 PNG_EXPORT(25, void, png_convert_from_time_t, (png_timep ptime, time_t ttime));
1137 #endif /* PNG_CONVERT_tIME_SUPPORTED */
1138 
1139 #ifdef PNG_READ_EXPAND_SUPPORTED
1140 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1145 #endif
1146 
1147 #ifdef PNG_READ_EXPAND_16_SUPPORTED
1148 /* Expand to 16-bit channels, forces conversion of palette to RGB and expansion
1149  * of a tRNS chunk if present.
1150  */
1152 #endif
1153 
1154 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1155 /* Use blue, green, red order for pixels. */
1157 #endif
1158 
1159 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
1160 /* Expand the grayscale to 24-bit RGB if necessary. */
1162 #endif
1163 
1164 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1165 /* Reduce RGB to grayscale. */
1166 #define PNG_ERROR_ACTION_NONE 1
1167 #define PNG_ERROR_ACTION_WARN 2
1168 #define PNG_ERROR_ACTION_ERROR 3
1169 #define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/
1170 
1172  int error_action, double red, double green))
1175 
1177  png_ptr));
1178 #endif
1179 
1180 #ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED
1181 PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth,
1182  png_colorp palette));
1183 #endif
1184 
1185 #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
1186 /* How the alpha channel is interpreted - this affects how the color channels of
1187  * a PNG file are returned when an alpha channel, or tRNS chunk in a palette
1188  * file, is present.
1189  *
1190  * This has no effect on the way pixels are written into a PNG output
1191  * datastream. The color samples in a PNG datastream are never premultiplied
1192  * with the alpha samples.
1193  *
1194  * The default is to return data according to the PNG specification: the alpha
1195  * channel is a linear measure of the contribution of the pixel to the
1196  * corresponding composited pixel. The gamma encoded color channels must be
1197  * scaled according to the contribution and to do this it is necessary to undo
1198  * the encoding, scale the color values, perform the composition and reencode
1199  * the values. This is the 'PNG' mode.
1200  *
1201  * The alternative is to 'associate' the alpha with the color information by
1202  * storing color channel values that have been scaled by the alpha. The
1203  * advantage is that the color channels can be resampled (the image can be
1204  * scaled) in this form. The disadvantage is that normal practice is to store
1205  * linear, not (gamma) encoded, values and this requires 16-bit channels for
1206  * still images rather than the 8-bit channels that are just about sufficient if
1207  * gamma encoding is used. In addition all non-transparent pixel values,
1208  * including completely opaque ones, must be gamma encoded to produce the final
1209  * image. This is the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' mode (the
1210  * latter being the two common names for associated alpha color channels.)
1211  *
1212  * Since it is not necessary to perform arithmetic on opaque color values so
1213  * long as they are not to be resampled and are in the final color space it is
1214  * possible to optimize the handling of alpha by storing the opaque pixels in
1215  * the PNG format (adjusted for the output color space) while storing partially
1216  * opaque pixels in the standard, linear, format. The accuracy required for
1217  * standard alpha composition is relatively low, because the pixels are
1218  * isolated, therefore typically the accuracy loss in storing 8-bit linear
1219  * values is acceptable. (This is not true if the alpha channel is used to
1220  * simulate transparency over large areas - use 16 bits or the PNG mode in
1221  * this case!) This is the 'OPTIMIZED' mode. For this mode a pixel is
1222  * treated as opaque only if the alpha value is equal to the maximum value.
1223  *
1224  * The final choice is to gamma encode the alpha channel as well. This is
1225  * broken because, in practice, no implementation that uses this choice
1226  * correctly undoes the encoding before handling alpha composition. Use this
1227  * choice only if other serious errors in the software or hardware you use
1228  * mandate it; the typical serious error is for dark halos to appear around
1229  * opaque areas of the composited PNG image because of arithmetic overflow.
1230  *
1231  * The API function png_set_alpha_mode specifies which of these choices to use
1232  * with an enumerated 'mode' value and the gamma of the required output:
1233  */
1234 #define PNG_ALPHA_PNG 0 /* according to the PNG standard */
1235 #define PNG_ALPHA_STANDARD 1 /* according to Porter/Duff */
1236 #define PNG_ALPHA_ASSOCIATED 1 /* as above; this is the normal practice */
1237 #define PNG_ALPHA_PREMULTIPLIED 1 /* as above */
1238 #define PNG_ALPHA_OPTIMIZED 2 /* 'PNG' for opaque pixels, else 'STANDARD' */
1239 #define PNG_ALPHA_BROKEN 3 /* the alpha channel is gamma encoded */
1240 
1242  double output_gamma))
1244  int mode, png_fixed_point output_gamma))
1245 #endif
1246 
1247 #if defined(PNG_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED)
1248 /* The output_gamma value is a screen gamma in libpng terminology: it expresses
1249  * how to decode the output values, not how they are encoded. The values used
1250  * correspond to the normal numbers used to describe the overall gamma of a
1251  * computer display system; for example 2.2 for an sRGB conformant system. The
1252  * values are scaled by 100000 in the _fixed version of the API (so 220000 for
1253  * sRGB.)
1254  *
1255  * The inverse of the value is always used to provide a default for the PNG file
1256  * encoding if it has no gAMA chunk and if png_set_gamma() has not been called
1257  * to override the PNG gamma information.
1258  *
1259  * When the ALPHA_OPTIMIZED mode is selected the output gamma is used to encode
1260  * opaque pixels however pixels with lower alpha values are not encoded,
1261  * regardless of the output gamma setting.
1262  *
1263  * When the standard Porter Duff handling is requested with mode 1 the output
1264  * encoding is set to be linear and the output_gamma value is only relevant
1265  * as a default for input data that has no gamma information. The linear output
1266  * encoding will be overridden if png_set_gamma() is called - the results may be
1267  * highly unexpected!
1268  *
1269  * The following numbers are derived from the sRGB standard and the research
1270  * behind it. sRGB is defined to be approximated by a PNG gAMA chunk value of
1271  * 0.45455 (1/2.2) for PNG. The value implicitly includes any viewing
1272  * correction required to take account of any differences in the color
1273  * environment of the original scene and the intended display environment; the
1274  * value expresses how to *decode* the image for display, not how the original
1275  * data was *encoded*.
1276  *
1277  * sRGB provides a peg for the PNG standard by defining a viewing environment.
1278  * sRGB itself, and earlier TV standards, actually use a more complex transform
1279  * (a linear portion then a gamma 2.4 power law) than PNG can express. (PNG is
1280  * limited to simple power laws.) By saying that an image for direct display on
1281  * an sRGB conformant system should be stored with a gAMA chunk value of 45455
1282  * (11.3.3.2 and 11.3.3.5 of the ISO PNG specification) the PNG specification
1283  * makes it possible to derive values for other display systems and
1284  * environments.
1285  *
1286  * The Mac value is deduced from the sRGB based on an assumption that the actual
1287  * extra viewing correction used in early Mac display systems was implemented as
1288  * a power 1.45 lookup table.
1289  *
1290  * Any system where a programmable lookup table is used or where the behavior of
1291  * the final display device characteristics can be changed requires system
1292  * specific code to obtain the current characteristic. However this can be
1293  * difficult and most PNG gamma correction only requires an approximate value.
1294  *
1295  * By default, if png_set_alpha_mode() is not called, libpng assumes that all
1296  * values are unencoded, linear, values and that the output device also has a
1297  * linear characteristic. This is only very rarely correct - it is invariably
1298  * better to call png_set_alpha_mode() with PNG_DEFAULT_sRGB than rely on the
1299  * default if you don't know what the right answer is!
1300  *
1301  * The special value PNG_GAMMA_MAC_18 indicates an older Mac system (pre Mac OS
1302  * 10.6) which used a correction table to implement a somewhat lower gamma on an
1303  * otherwise sRGB system.
1304  *
1305  * Both these values are reserved (not simple gamma values) in order to allow
1306  * more precise correction internally in the future.
1307  *
1308  * NOTE: the following values can be passed to either the fixed or floating
1309  * point APIs, but the floating point API will also accept floating point
1310  * values.
1311  */
1312 #define PNG_DEFAULT_sRGB -1 /* sRGB gamma and color space */
1313 #define PNG_GAMMA_MAC_18 -2 /* Old Mac '1.8' gamma and color space */
1314 #define PNG_GAMMA_sRGB 220000 /* Television standards--matches sRGB gamma */
1315 #define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */
1316 #endif
1317 
1318 /* The following are examples of calls to png_set_alpha_mode to achieve the
1319  * required overall gamma correction and, where necessary, alpha
1320  * premultiplication.
1321  *
1322  * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);
1323  * This is the default libpng handling of the alpha channel - it is not
1324  * pre-multiplied into the color components. In addition the call states
1325  * that the output is for a sRGB system and causes all PNG files without gAMA
1326  * chunks to be assumed to be encoded using sRGB.
1327  *
1328  * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
1329  * In this case the output is assumed to be something like an sRGB conformant
1330  * display preceeded by a power-law lookup table of power 1.45. This is how
1331  * early Mac systems behaved.
1332  *
1333  * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR);
1334  * This is the classic Jim Blinn approach and will work in academic
1335  * environments where everything is done by the book. It has the shortcoming
1336  * of assuming that input PNG data with no gamma information is linear - this
1337  * is unlikely to be correct unless the PNG files where generated locally.
1338  * Most of the time the output precision will be so low as to show
1339  * significant banding in dark areas of the image.
1340  *
1341  * png_set_expand_16(pp);
1342  * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB);
1343  * This is a somewhat more realistic Jim Blinn inspired approach. PNG files
1344  * are assumed to have the sRGB encoding if not marked with a gamma value and
1345  * the output is always 16 bits per component. This permits accurate scaling
1346  * and processing of the data. If you know that your input PNG files were
1347  * generated locally you might need to replace PNG_DEFAULT_sRGB with the
1348  * correct value for your system.
1349  *
1350  * png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB);
1351  * If you just need to composite the PNG image onto an existing background
1352  * and if you control the code that does this you can use the optimization
1353  * setting. In this case you just copy completely opaque pixels to the
1354  * output. For pixels that are not completely transparent (you just skip
1355  * those) you do the composition math using png_composite or png_composite_16
1356  * below then encode the resultant 8-bit or 16-bit values to match the output
1357  * encoding.
1358  *
1359  * Other cases
1360  * If neither the PNG nor the standard linear encoding work for you because
1361  * of the software or hardware you use then you have a big problem. The PNG
1362  * case will probably result in halos around the image. The linear encoding
1363  * will probably result in a washed out, too bright, image (it's actually too
1364  * contrasty.) Try the ALPHA_OPTIMIZED mode above - this will probably
1365  * substantially reduce the halos. Alternatively try:
1366  *
1367  * png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB);
1368  * This option will also reduce the halos, but there will be slight dark
1369  * halos round the opaque parts of the image where the background is light.
1370  * In the OPTIMIZED mode the halos will be light halos where the background
1371  * is dark. Take your pick - the halos are unavoidable unless you can get
1372  * your hardware/software fixed! (The OPTIMIZED approach is slightly
1373  * faster.)
1374  *
1375  * When the default gamma of PNG files doesn't match the output gamma.
1376  * If you have PNG files with no gamma information png_set_alpha_mode allows
1377  * you to provide a default gamma, but it also sets the ouput gamma to the
1378  * matching value. If you know your PNG files have a gamma that doesn't
1379  * match the output you can take advantage of the fact that
1380  * png_set_alpha_mode always sets the output gamma but only sets the PNG
1381  * default if it is not already set:
1382  *
1383  * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);
1384  * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
1385  * The first call sets both the default and the output gamma values, the
1386  * second call overrides the output gamma without changing the default. This
1387  * is easier than achieving the same effect with png_set_gamma. You must use
1388  * PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will
1389  * fire if more than one call to png_set_alpha_mode and png_set_background is
1390  * made in the same read operation, however multiple calls with PNG_ALPHA_PNG
1391  * are ignored.
1392  */
1393 
1394 #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
1395 PNG_EXPORT(36, void, png_set_strip_alpha, (png_structrp png_ptr));
1396 #endif
1397 
1398 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
1399  defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1400 PNG_EXPORT(37, void, png_set_swap_alpha, (png_structrp png_ptr));
1401 #endif
1402 
1403 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
1404  defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1405 PNG_EXPORT(38, void, png_set_invert_alpha, (png_structrp png_ptr));
1406 #endif
1407 
1408 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1409 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
1410 PNG_EXPORT(39, void, png_set_filler, (png_structrp png_ptr, png_uint_32 filler,
1411  int flags));
1412 /* The values of the PNG_FILLER_ defines should NOT be changed */
1413 # define PNG_FILLER_BEFORE 0
1414 # define PNG_FILLER_AFTER 1
1415 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
1416 PNG_EXPORT(40, void, png_set_add_alpha, (png_structrp png_ptr,
1417  png_uint_32 filler, int flags));
1418 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
1419 
1420 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1421 /* Swap bytes in 16-bit depth files. */
1422 PNG_EXPORT(41, void, png_set_swap, (png_structrp png_ptr));
1423 #endif
1424 
1425 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
1426 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
1427 PNG_EXPORT(42, void, png_set_packing, (png_structrp png_ptr));
1428 #endif
1429 
1430 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1431  defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1432 /* Swap packing order of pixels in bytes. */
1433 PNG_EXPORT(43, void, png_set_packswap, (png_structrp png_ptr));
1434 #endif
1435 
1436 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1437 /* Converts files to legal bit depths. */
1439  true_bits));
1440 #endif
1441 
1442 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1443  defined(PNG_WRITE_INTERLACING_SUPPORTED)
1444 /* Have the code handle the interlacing. Returns the number of passes.
1445  * MUST be called before png_read_update_info or png_start_read_image,
1446  * otherwise it will not have the desired effect. Note that it is still
1447  * necessary to call png_read_row or png_read_rows png_get_image_height
1448  * times for each pass.
1449 */
1451 #endif
1452 
1453 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1454 /* Invert monochrome files */
1455 PNG_EXPORT(46, void, png_set_invert_mono, (png_structrp png_ptr));
1456 #endif
1457 
1458 #ifdef PNG_READ_BACKGROUND_SUPPORTED
1459 /* Handle alpha and tRNS by replacing with a background color. Prior to
1460  * libpng-1.5.4 this API must not be called before the PNG file header has been
1461  * read. Doing so will result in unexpected behavior and possible warnings or
1462  * errors if the PNG file contains a bKGD chunk.
1463  */
1464 PNG_FP_EXPORT(47, void, png_set_background, (png_structrp png_ptr,
1466  int need_expand, double background_gamma))
1469  int need_expand, png_fixed_point background_gamma))
1470 #endif
1471 #ifdef PNG_READ_BACKGROUND_SUPPORTED
1472 # define PNG_BACKGROUND_GAMMA_UNKNOWN 0
1473 # define PNG_BACKGROUND_GAMMA_SCREEN 1
1474 # define PNG_BACKGROUND_GAMMA_FILE 2
1475 # define PNG_BACKGROUND_GAMMA_UNIQUE 3
1476 #endif
1477 
1478 #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
1479 /* Scale a 16-bit depth file down to 8-bit, accurately. */
1480 PNG_EXPORT(229, void, png_set_scale_16, (png_structrp png_ptr));
1481 #endif
1482 
1483 #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
1484 #define PNG_READ_16_TO_8 SUPPORTED /* Name prior to 1.5.4 */
1485 /* Strip the second byte of information from a 16-bit depth file. */
1486 PNG_EXPORT(48, void, png_set_strip_16, (png_structrp png_ptr));
1487 #endif
1488 
1489 #ifdef PNG_READ_QUANTIZE_SUPPORTED
1490 /* Turn on quantizing, and reduce the palette to the number of colors
1491  * available.
1492  */
1493 PNG_EXPORT(49, void, png_set_quantize, (png_structrp png_ptr,
1494  png_colorp palette, int num_palette, int maximum_colors,
1495  png_const_uint_16p histogram, int full_quantize));
1496 #endif
1497 
1498 #ifdef PNG_READ_GAMMA_SUPPORTED
1499 /* The threshold on gamma processing is configurable but hard-wired into the
1500  * library. The following is the floating point variant.
1501  */
1502 #define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001)
1503 
1504 /* Handle gamma correction. Screen_gamma=(display_exponent).
1505  * NOTE: this API simply sets the screen and file gamma values. It will
1506  * therefore override the value for gamma in a PNG file if it is called after
1507  * the file header has been read - use with care - call before reading the PNG
1508  * file for best results!
1509  *
1510  * These routines accept the same gamma values as png_set_alpha_mode (described
1511  * above). The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either
1512  * API (floating point or fixed.) Notice, however, that the 'file_gamma' value
1513  * is the inverse of a 'screen gamma' value.
1514  */
1515 PNG_FP_EXPORT(50, void, png_set_gamma, (png_structrp png_ptr,
1516  double screen_gamma, double override_file_gamma))
1518  png_fixed_point screen_gamma, png_fixed_point override_file_gamma))
1519 #endif
1520 
1521 #ifdef PNG_WRITE_FLUSH_SUPPORTED
1522 /* Set how many lines between output flushes - 0 for no flushing */
1523 PNG_EXPORT(51, void, png_set_flush, (png_structrp png_ptr, int nrows));
1524 /* Flush the current PNG output buffer */
1525 PNG_EXPORT(52, void, png_write_flush, (png_structrp png_ptr));
1526 #endif
1527 
1528 /* Optional update palette with requested transformations */
1529 PNG_EXPORT(53, void, png_start_read_image, (png_structrp png_ptr));
1530 
1531 /* Optional call to update the users info structure */
1532 PNG_EXPORT(54, void, png_read_update_info, (png_structrp png_ptr,
1533  png_inforp info_ptr));
1534 
1535 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1536 /* Read one or more rows of image data. */
1537 PNG_EXPORT(55, void, png_read_rows, (png_structrp png_ptr, png_bytepp row,
1538  png_bytepp display_row, png_uint_32 num_rows));
1539 #endif
1540 
1541 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1542 /* Read a row of data. */
1543 PNG_EXPORT(56, void, png_read_row, (png_structrp png_ptr, png_bytep row,
1544  png_bytep display_row));
1545 #endif
1546 
1547 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1548 /* Read the whole image into memory at once. */
1549 PNG_EXPORT(57, void, png_read_image, (png_structrp png_ptr, png_bytepp image));
1550 #endif
1551 
1552 /* Write a row of image data */
1553 PNG_EXPORT(58, void, png_write_row, (png_structrp png_ptr,
1554  png_const_bytep row));
1555 
1556 /* Write a few rows of image data: (*row) is not written; however, the type
1557  * is declared as writeable to maintain compatibility with previous versions
1558  * of libpng and to allow the 'display_row' array from read_rows to be passed
1559  * unchanged to write_rows.
1560  */
1561 PNG_EXPORT(59, void, png_write_rows, (png_structrp png_ptr, png_bytepp row,
1563 
1564 /* Write the image data */
1565 PNG_EXPORT(60, void, png_write_image, (png_structrp png_ptr, png_bytepp image));
1566 
1567 /* Write the end of the PNG file. */
1568 PNG_EXPORT(61, void, png_write_end, (png_structrp png_ptr,
1569  png_inforp info_ptr));
1570 
1571 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1572 /* Read the end of the PNG file. */
1573 PNG_EXPORT(62, void, png_read_end, (png_structrp png_ptr, png_inforp info_ptr));
1574 #endif
1575 
1576 /* Free any memory associated with the png_info_struct */
1578  png_infopp info_ptr_ptr));
1579 
1580 /* Free any memory associated with the png_struct and the png_info_structs */
1581 PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr,
1582  png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
1583 
1584 /* Free any memory associated with the png_struct and the png_info_structs */
1585 PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr,
1586  png_infopp info_ptr_ptr));
1587 
1588 /* Set the libpng method of handling chunk CRC errors */
1589 PNG_EXPORT(66, void, png_set_crc_action, (png_structrp png_ptr, int crit_action,
1590  int ancil_action));
1591 
1592 /* Values for png_set_crc_action() say how to handle CRC errors in
1593  * ancillary and critical chunks, and whether to use the data contained
1594  * therein. Note that it is impossible to "discard" data in a critical
1595  * chunk. For versions prior to 0.90, the action was always error/quit,
1596  * whereas in version 0.90 and later, the action for CRC errors in ancillary
1597  * chunks is warn/discard. These values should NOT be changed.
1598  *
1599  * value action:critical action:ancillary
1600  */
1601 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
1602 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
1603 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
1604 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
1605 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
1606 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
1607 
1608 /* These functions give the user control over the scan-line filtering in
1609  * libpng and the compression methods used by zlib. These functions are
1610  * mainly useful for testing, as the defaults should work with most users.
1611  * Those users who are tight on memory or want faster performance at the
1612  * expense of compression can modify them. See the compression library
1613  * header file (zlib.h) for an explination of the compression functions.
1614  */
1615 
1616 /* Set the filtering method(s) used by libpng. Currently, the only valid
1617  * value for "method" is 0.
1618  */
1619 PNG_EXPORT(67, void, png_set_filter, (png_structrp png_ptr, int method,
1620  int filters));
1621 
1622 /* Flags for png_set_filter() to say which filters to use. The flags
1623  * are chosen so that they don't conflict with real filter types
1624  * below, in case they are supplied instead of the #defined constants.
1625  * These values should NOT be changed.
1626  */
1627 #define PNG_NO_FILTERS 0x00
1628 #define PNG_FILTER_NONE 0x08
1629 #define PNG_FILTER_SUB 0x10
1630 #define PNG_FILTER_UP 0x20
1631 #define PNG_FILTER_AVG 0x40
1632 #define PNG_FILTER_PAETH 0x80
1633 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
1634  PNG_FILTER_AVG | PNG_FILTER_PAETH)
1635 
1636 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
1637  * These defines should NOT be changed.
1638  */
1639 #define PNG_FILTER_VALUE_NONE 0
1640 #define PNG_FILTER_VALUE_SUB 1
1641 #define PNG_FILTER_VALUE_UP 2
1642 #define PNG_FILTER_VALUE_AVG 3
1643 #define PNG_FILTER_VALUE_PAETH 4
1644 #define PNG_FILTER_VALUE_LAST 5
1645 
1646 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */
1647 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
1648  * defines, either the default (minimum-sum-of-absolute-differences), or
1649  * the experimental method (weighted-minimum-sum-of-absolute-differences).
1650  *
1651  * Weights are factors >= 1.0, indicating how important it is to keep the
1652  * filter type consistent between rows. Larger numbers mean the current
1653  * filter is that many times as likely to be the same as the "num_weights"
1654  * previous filters. This is cumulative for each previous row with a weight.
1655  * There needs to be "num_weights" values in "filter_weights", or it can be
1656  * NULL if the weights aren't being specified. Weights have no influence on
1657  * the selection of the first row filter. Well chosen weights can (in theory)
1658  * improve the compression for a given image.
1659  *
1660  * Costs are factors >= 1.0 indicating the relative decoding costs of a
1661  * filter type. Higher costs indicate more decoding expense, and are
1662  * therefore less likely to be selected over a filter with lower computational
1663  * costs. There needs to be a value in "filter_costs" for each valid filter
1664  * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
1665  * setting the costs. Costs try to improve the speed of decompression without
1666  * unduly increasing the compressed image size.
1667  *
1668  * A negative weight or cost indicates the default value is to be used, and
1669  * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
1670  * The default values for both weights and costs are currently 1.0, but may
1671  * change if good general weighting/cost heuristics can be found. If both
1672  * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
1673  * to the UNWEIGHTED method, but with added encoding time/computation.
1674  */
1677  png_const_doublep filter_costs))
1679  (png_structrp png_ptr, int heuristic_method, int num_weights,
1681  png_const_fixed_point_p filter_costs))
1682 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1683 
1684 /* Heuristic used for row filter selection. These defines should NOT be
1685  * changed.
1686  */
1687 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
1688 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
1689 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
1690 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
1691 
1692 #ifdef PNG_WRITE_SUPPORTED
1693 /* Set the library compression level. Currently, valid values range from
1694  * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
1695  * (0 - no compression, 9 - "maximal" compression). Note that tests have
1696  * shown that zlib compression levels 3-6 usually perform as well as level 9
1697  * for PNG images, and do considerably fewer caclulations. In the future,
1698  * these values may not correspond directly to the zlib compression levels.
1699  */
1701  int level));
1702 
1704  int mem_level));
1705 
1707  int strategy));
1708 
1709 /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
1710  * smaller value of window_bits if it can do so safely.
1711  */
1713  int window_bits));
1714 
1716  int method));
1717 #endif
1718 
1719 #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
1720 /* Also set zlib parameters for compressing non-IDAT chunks */
1722  int level));
1723 
1725  int mem_level));
1726 
1728  int strategy));
1729 
1730 /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
1731  * smaller value of window_bits if it can do so safely.
1732  */
1734  (png_structrp png_ptr, int window_bits));
1735 
1737  int method));
1738 #endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */
1739 
1740 /* These next functions are called for input/output, memory, and error
1741  * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
1742  * and call standard C I/O routines such as fread(), fwrite(), and
1743  * fprintf(). These functions can be made to use other I/O routines
1744  * at run time for those applications that need to handle I/O in a
1745  * different manner by calling png_set_???_fn(). See libpng-manual.txt for
1746  * more information.
1747  */
1748 
1749 #ifdef PNG_STDIO_SUPPORTED
1750 /* Initialize the input/output for the PNG file to the default functions. */
1751 PNG_EXPORT(74, void, png_init_io, (png_structrp png_ptr, png_FILE_p fp));
1752 #endif
1753 
1754 /* Replace the (error and abort), and warning functions with user
1755  * supplied functions. If no messages are to be printed you must still
1756  * write and use replacement functions. The replacement error_fn should
1757  * still do a longjmp to the last setjmp location if you are using this
1758  * method of error handling. If error_fn or warning_fn is NULL, the
1759  * default function will be used.
1760  */
1761 
1762 PNG_EXPORT(75, void, png_set_error_fn, (png_structrp png_ptr,
1763  png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
1764 
1765 /* Return the user pointer associated with the error functions */
1767 
1768 /* Replace the default data output functions with a user supplied one(s).
1769  * If buffered output is not used, then output_flush_fn can be set to NULL.
1770  * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
1771  * output_flush_fn will be ignored (and thus can be NULL).
1772  * It is probably a mistake to use NULL for output_flush_fn if
1773  * write_data_fn is not also NULL unless you have built libpng with
1774  * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
1775  * default flush function, which uses the standard *FILE structure, will
1776  * be used.
1777  */
1778 PNG_EXPORT(77, void, png_set_write_fn, (png_structrp png_ptr, png_voidp io_ptr,
1779  png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
1780 
1781 /* Replace the default data input function with a user supplied one. */
1782 PNG_EXPORT(78, void, png_set_read_fn, (png_structrp png_ptr, png_voidp io_ptr,
1783  png_rw_ptr read_data_fn));
1784 
1785 /* Return the user pointer associated with the I/O functions */
1787 
1788 PNG_EXPORT(80, void, png_set_read_status_fn, (png_structrp png_ptr,
1789  png_read_status_ptr read_row_fn));
1790 
1791 PNG_EXPORT(81, void, png_set_write_status_fn, (png_structrp png_ptr,
1792  png_write_status_ptr write_row_fn));
1793 
1794 #ifdef PNG_USER_MEM_SUPPORTED
1795 /* Replace the default memory allocation functions with user supplied one(s). */
1796 PNG_EXPORT(82, void, png_set_mem_fn, (png_structrp png_ptr, png_voidp mem_ptr,
1797  png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1798 /* Return the user pointer associated with the memory functions */
1799 PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structrp png_ptr));
1800 #endif
1801 
1802 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
1804  png_user_transform_ptr read_user_transform_fn));
1805 #endif
1806 
1807 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
1809  png_user_transform_ptr write_user_transform_fn));
1810 #endif
1811 
1812 #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
1814  png_voidp user_transform_ptr, int user_transform_depth,
1815  int user_transform_channels));
1816 /* Return the user pointer associated with the user transform functions */
1818  (png_const_structrp png_ptr));
1819 #endif
1820 
1821 #ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED
1822 /* Return information about the row currently being processed. Note that these
1823  * APIs do not fail but will return unexpected results if called outside a user
1824  * transform callback. Also note that when transforming an interlaced image the
1825  * row number is the row number within the sub-image of the interlace pass, so
1826  * the value will increase to the height of the sub-image (not the full image)
1827  * then reset to 0 for the next pass.
1828  *
1829  * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
1830  * find the output pixel (x,y) given an interlaced sub-image pixel
1831  * (row,col,pass). (See below for these macros.)
1832  */
1835 #endif
1836 
1837 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
1838 /* This callback is called only for *unknown* chunks. If
1839  * PNG_HANDLE_AS_UNKNOWN_SUPPORTED is set then it is possible to set known
1840  * chunks to be treated as unknown, however in this case the callback must do
1841  * any processing required by the chunk (e.g. by calling the appropriate
1842  * png_set_ APIs.)
1843  *
1844  * There is no write support - on write, by default, all the chunks in the
1845  * 'unknown' list are written in the specified position.
1846  *
1847  * The integer return from the callback function is interpreted thus:
1848  *
1849  * negative: An error occured, png_chunk_error will be called.
1850  * zero: The chunk was not handled, the chunk will be saved. A critical
1851  * chunk will cause an error at this point unless it is to be saved.
1852  * positive: The chunk was handled, libpng will ignore/discard it.
1853  *
1854  * See "INTERACTION WTIH USER CHUNK CALLBACKS" below for important notes about
1855  * how this behavior will change in libpng 1.7
1856  */
1858  png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
1859 #endif
1860 
1861 #ifdef PNG_USER_CHUNKS_SUPPORTED
1863 #endif
1864 
1865 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1866 /* Sets the function callbacks for the push reader, and a pointer to a
1867  * user-defined structure available to the callback functions.
1868  */
1870  png_voidp progressive_ptr, png_progressive_info_ptr info_fn,
1871  png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn));
1872 
1873 /* Returns the user pointer associated with the push read functions */
1875  (png_const_structrp png_ptr));
1876 
1877 /* Function to be called when data becomes available */
1878 PNG_EXPORT(92, void, png_process_data, (png_structrp png_ptr,
1879  png_inforp info_ptr, png_bytep buffer, png_size_t buffer_size));
1880 
1881 /* A function which may be called *only* within png_process_data to stop the
1882  * processing of any more data. The function returns the number of bytes
1883  * remaining, excluding any that libpng has cached internally. A subsequent
1884  * call to png_process_data must supply these bytes again. If the argument
1885  * 'save' is set to true the routine will first save all the pending data and
1886  * will always return 0.
1887  */
1889 
1890 /* A function which may be called *only* outside (after) a call to
1891  * png_process_data. It returns the number of bytes of data to skip in the
1892  * input. Normally it will return 0, but if it returns a non-zero value the
1893  * application must skip than number of bytes of input data and pass the
1894  * following data to the next call to png_process_data.
1895  */
1897 
1898 #ifdef PNG_READ_INTERLACING_SUPPORTED
1899 /* Function that combines rows. 'new_row' is a flag that should come from
1900  * the callback and be non-NULL if anything needs to be done; the library
1901  * stores its own version of the new data internally and ignores the passed
1902  * in value.
1903  */
1905  png_bytep old_row, png_const_bytep new_row));
1906 #endif /* PNG_READ_INTERLACING_SUPPORTED */
1907 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1908 
1909 PNG_EXPORTA(94, png_voidp, png_malloc, (png_const_structrp png_ptr,
1911 /* Added at libpng version 1.4.0 */
1912 PNG_EXPORTA(95, png_voidp, png_calloc, (png_const_structrp png_ptr,
1914 
1915 /* Added at libpng version 1.2.4 */
1916 PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_const_structrp png_ptr,
1918 
1919 /* Frees a pointer allocated by png_malloc() */
1920 PNG_EXPORT(97, void, png_free, (png_const_structrp png_ptr, png_voidp ptr));
1921 
1922 /* Free data that was allocated internally */
1923 PNG_EXPORT(98, void, png_free_data, (png_const_structrp png_ptr,
1924  png_inforp info_ptr, png_uint_32 free_me, int num));
1925 
1926 /* Reassign responsibility for freeing existing data, whether allocated
1927  * by libpng or by the application; this works on the png_info structure passed
1928  * in, it does not change the state for other png_info structures.
1929  *
1930  * It is unlikely that this function works correctly as of 1.6.0 and using it
1931  * may result either in memory leaks or double free of allocated data.
1932  */
1933 PNG_EXPORTA(99, void, png_data_freer, (png_const_structrp png_ptr,
1934  png_inforp info_ptr, int freer, png_uint_32 mask), PNG_DEPRECATED);
1935 
1936 /* Assignments for png_data_freer */
1937 #define PNG_DESTROY_WILL_FREE_DATA 1
1938 #define PNG_SET_WILL_FREE_DATA 1
1939 #define PNG_USER_WILL_FREE_DATA 2
1940 /* Flags for png_ptr->free_me and info_ptr->free_me */
1941 #define PNG_FREE_HIST 0x0008
1942 #define PNG_FREE_ICCP 0x0010
1943 #define PNG_FREE_SPLT 0x0020
1944 #define PNG_FREE_ROWS 0x0040
1945 #define PNG_FREE_PCAL 0x0080
1946 #define PNG_FREE_SCAL 0x0100
1947 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
1948 # define PNG_FREE_UNKN 0x0200
1949 #endif
1950 /* PNG_FREE_LIST 0x0400 removed in 1.6.0 because it is ignored */
1951 #define PNG_FREE_PLTE 0x1000
1952 #define PNG_FREE_TRNS 0x2000
1953 #define PNG_FREE_TEXT 0x4000
1954 #define PNG_FREE_ALL 0x7fff
1955 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
1956 
1957 #ifdef PNG_USER_MEM_SUPPORTED
1958 PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_const_structrp png_ptr,
1960 PNG_EXPORTA(101, void, png_free_default, (png_const_structrp png_ptr,
1961  png_voidp ptr), PNG_DEPRECATED);
1962 #endif
1963 
1964 #ifdef PNG_ERROR_TEXT_SUPPORTED
1965 /* Fatal error in PNG image of libpng - can't continue */
1966 PNG_EXPORTA(102, void, png_error, (png_const_structrp png_ptr,
1967  png_const_charp error_message), PNG_NORETURN);
1968 
1969 /* The same, but the chunk name is prepended to the error string. */
1970 PNG_EXPORTA(103, void, png_chunk_error, (png_const_structrp png_ptr,
1971  png_const_charp error_message), PNG_NORETURN);
1972 
1973 #else
1974 /* Fatal error in PNG image of libpng - can't continue */
1975 PNG_EXPORTA(104, void, png_err, (png_const_structrp png_ptr), PNG_NORETURN);
1976 #endif
1977 
1978 #ifdef PNG_WARNINGS_SUPPORTED
1979 /* Non-fatal error in libpng. Can continue, but may have a problem. */
1980 PNG_EXPORT(105, void, png_warning, (png_const_structrp png_ptr,
1981  png_const_charp warning_message));
1982 
1983 /* Non-fatal error in libpng, chunk name is prepended to message. */
1984 PNG_EXPORT(106, void, png_chunk_warning, (png_const_structrp png_ptr,
1985  png_const_charp warning_message));
1986 #endif
1987 
1988 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1989 /* Benign error in libpng. Can continue, but may have a problem.
1990  * User can choose whether to handle as a fatal error or as a warning. */
1991 PNG_EXPORT(107, void, png_benign_error, (png_const_structrp png_ptr,
1992  png_const_charp warning_message));
1993 
1994 #ifdef PNG_READ_SUPPORTED
1995 /* Same, chunk name is prepended to message (only during read) */
1997  png_const_charp warning_message));
1998 #endif
1999 
2001  (png_structrp png_ptr, int allowed));
2002 #else
2003 # ifdef PNG_ALLOW_BENIGN_ERRORS
2004 # define png_benign_error png_warning
2005 # define png_chunk_benign_error png_chunk_warning
2006 # else
2007 # define png_benign_error png_error
2008 # define png_chunk_benign_error png_chunk_error
2009 # endif
2010 #endif
2011 
2012 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
2013  * Similarly, the png_get_<chunk> calls are used to read values from the
2014  * png_info_struct, either storing the parameters in the passed variables, or
2015  * setting pointers into the png_info_struct where the data is stored. The
2016  * png_get_<chunk> functions return a non-zero value if the data was available
2017  * in info_ptr, or return zero and do not change any of the parameters if the
2018  * data was not available.
2019  *
2020  * These functions should be used instead of directly accessing png_info
2021  * to avoid problems with future changes in the size and internal layout of
2022  * png_info_struct.
2023  */
2024 /* Returns "flag" if chunk data is valid in info_ptr. */
2027 
2028 /* Returns number of bytes needed to hold a transformed row. */
2031 
2032 #ifdef PNG_INFO_IMAGE_SUPPORTED
2033 /* Returns row_pointers, which is an array of pointers to scanlines that was
2034  * returned from png_read_png().
2035  */
2038 
2039 /* Set row_pointers, which is an array of pointers to scanlines for use
2040  * by png_write_png().
2041  */
2042 PNG_EXPORT(113, void, png_set_rows, (png_const_structrp png_ptr,
2043  png_inforp info_ptr, png_bytepp row_pointers));
2044 #endif
2045 
2046 /* Returns number of color channels in image. */
2047 PNG_EXPORT(114, png_byte, png_get_channels, (png_const_structrp png_ptr,
2049 
2050 #ifdef PNG_EASY_ACCESS_SUPPORTED
2051 /* Returns image width in pixels. */
2054 
2055 /* Returns image height in pixels. */
2058 
2059 /* Returns image bit_depth. */
2060 PNG_EXPORT(117, png_byte, png_get_bit_depth, (png_const_structrp png_ptr,
2062 
2063 /* Returns image color_type. */
2064 PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structrp png_ptr,
2066 
2067 /* Returns image filter_type. */
2068 PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structrp png_ptr,
2070 
2071 /* Returns image interlace_type. */
2072 PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structrp png_ptr,
2074 
2075 /* Returns image compression_type. */
2076 PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structrp png_ptr,
2078 
2079 /* Returns image resolution in pixels per meter, from pHYs chunk data. */
2086 
2087 /* Returns pixel aspect ratio, computed from pHYs chunk data. */
2092 
2093 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
2102 
2103 #endif /* PNG_EASY_ACCESS_SUPPORTED */
2104 
2105 #ifdef PNG_READ_SUPPORTED
2106 /* Returns pointer to signature string read from PNG header */
2109 #endif
2110 
2111 #ifdef PNG_bKGD_SUPPORTED
2113  png_inforp info_ptr, png_color_16p *background));
2114 #endif
2115 
2116 #ifdef PNG_bKGD_SUPPORTED
2117 PNG_EXPORT(132, void, png_set_bKGD, (png_const_structrp png_ptr,
2118  png_inforp info_ptr, png_const_color_16p background));
2119 #endif
2120 
2121 #ifdef PNG_cHRM_SUPPORTED
2123  png_const_inforp info_ptr, double *white_x, double *white_y, double *red_x,
2124  double *red_y, double *green_x, double *green_y, double *blue_x,
2125  double *blue_y))
2127  png_const_inforp info_ptr, double *red_X, double *red_Y, double *red_Z,
2128  double *green_X, double *green_Y, double *green_Z, double *blue_X,
2129  double *blue_Y, double *blue_Z))
2132  png_fixed_point *int_white_x, png_fixed_point *int_white_y,
2133  png_fixed_point *int_red_x, png_fixed_point *int_red_y,
2134  png_fixed_point *int_green_x, png_fixed_point *int_green_y,
2135  png_fixed_point *int_blue_x, png_fixed_point *int_blue_y))
2142  png_fixed_point *int_blue_Z))
2143 #endif
2144 
2145 #ifdef PNG_cHRM_SUPPORTED
2146 PNG_FP_EXPORT(135, void, png_set_cHRM, (png_const_structrp png_ptr,
2147  png_inforp info_ptr,
2148  double white_x, double white_y, double red_x, double red_y, double green_x,
2149  double green_y, double blue_x, double blue_y))
2151  png_inforp info_ptr, double red_X, double red_Y, double red_Z,
2152  double green_X, double green_Y, double green_Z, double blue_X,
2153  double blue_Y, double blue_Z))
2155  png_inforp info_ptr, png_fixed_point int_white_x,
2156  png_fixed_point int_white_y, png_fixed_point int_red_x,
2157  png_fixed_point int_red_y, png_fixed_point int_green_x,
2158  png_fixed_point int_green_y, png_fixed_point int_blue_x,
2159  png_fixed_point int_blue_y))
2161  png_inforp info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y,
2162  png_fixed_point int_red_Z, png_fixed_point int_green_X,
2163  png_fixed_point int_green_Y, png_fixed_point int_green_Z,
2164  png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
2165  png_fixed_point int_blue_Z))
2166 #endif
2167 
2168 #ifdef PNG_gAMA_SUPPORTED
2170  png_const_inforp info_ptr, double *file_gamma))
2172  (png_const_structrp png_ptr, png_const_inforp info_ptr,
2173  png_fixed_point *int_file_gamma))
2174 #endif
2175 
2176 #ifdef PNG_gAMA_SUPPORTED
2177 PNG_FP_EXPORT(139, void, png_set_gAMA, (png_const_structrp png_ptr,
2178  png_inforp info_ptr, double file_gamma))
2180  png_inforp info_ptr, png_fixed_point int_file_gamma))
2181 #endif
2182 
2183 #ifdef PNG_hIST_SUPPORTED
2185  png_inforp info_ptr, png_uint_16p *hist));
2186 #endif
2187 
2188 #ifdef PNG_hIST_SUPPORTED
2189 PNG_EXPORT(142, void, png_set_hIST, (png_const_structrp png_ptr,
2190  png_inforp info_ptr, png_const_uint_16p hist));
2191 #endif
2192 
2194  png_const_inforp info_ptr, png_uint_32 *width, png_uint_32 *height,
2195  int *bit_depth, int *color_type, int *interlace_method,
2196  int *compression_method, int *filter_method));
2197 
2198 PNG_EXPORT(144, void, png_set_IHDR, (png_const_structrp png_ptr,
2199  png_inforp info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
2200  int color_type, int interlace_method, int compression_method,
2201  int filter_method));
2202 
2203 #ifdef PNG_oFFs_SUPPORTED
2205  png_const_inforp info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
2206  int *unit_type));
2207 #endif
2208 
2209 #ifdef PNG_oFFs_SUPPORTED
2210 PNG_EXPORT(146, void, png_set_oFFs, (png_const_structrp png_ptr,
2211  png_inforp info_ptr, png_int_32 offset_x, png_int_32 offset_y,
2212  int unit_type));
2213 #endif
2214 
2215 #ifdef PNG_pCAL_SUPPORTED
2217  png_inforp info_ptr, png_charp *purpose, png_int_32 *X0,
2218  png_int_32 *X1, int *type, int *nparams, png_charp *units,
2219  png_charpp *params));
2220 #endif
2221 
2222 #ifdef PNG_pCAL_SUPPORTED
2223 PNG_EXPORT(148, void, png_set_pCAL, (png_const_structrp png_ptr,
2224  png_inforp info_ptr, png_const_charp purpose, png_int_32 X0, png_int_32 X1,
2225  int type, int nparams, png_const_charp units, png_charpp params));
2226 #endif
2227 
2228 #ifdef PNG_pHYs_SUPPORTED
2230  png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y,
2231  int *unit_type));
2232 #endif
2233 
2234 #ifdef PNG_pHYs_SUPPORTED
2235 PNG_EXPORT(150, void, png_set_pHYs, (png_const_structrp png_ptr,
2236  png_inforp info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
2237 #endif
2238 
2240  png_inforp info_ptr, png_colorp *palette, int *num_palette));
2241 
2242 PNG_EXPORT(152, void, png_set_PLTE, (png_structrp png_ptr,
2243  png_inforp info_ptr, png_const_colorp palette, int num_palette));
2244 
2245 #ifdef PNG_sBIT_SUPPORTED
2247  png_inforp info_ptr, png_color_8p *sig_bit));
2248 #endif
2249 
2250 #ifdef PNG_sBIT_SUPPORTED
2251 PNG_EXPORT(154, void, png_set_sBIT, (png_const_structrp png_ptr,
2252  png_inforp info_ptr, png_const_color_8p sig_bit));
2253 #endif
2254 
2255 #ifdef PNG_sRGB_SUPPORTED
2257  png_const_inforp info_ptr, int *file_srgb_intent));
2258 #endif
2259 
2260 #ifdef PNG_sRGB_SUPPORTED
2261 PNG_EXPORT(156, void, png_set_sRGB, (png_const_structrp png_ptr,
2262  png_inforp info_ptr, int srgb_intent));
2264  png_inforp info_ptr, int srgb_intent));
2265 #endif
2266 
2267 #ifdef PNG_iCCP_SUPPORTED
2269  png_inforp info_ptr, png_charpp name, int *compression_type,
2270  png_bytepp profile, png_uint_32 *proflen));
2271 #endif
2272 
2273 #ifdef PNG_iCCP_SUPPORTED
2274 PNG_EXPORT(159, void, png_set_iCCP, (png_const_structrp png_ptr,
2275  png_inforp info_ptr, png_const_charp name, int compression_type,
2276  png_const_bytep profile, png_uint_32 proflen));
2277 #endif
2278 
2279 #ifdef PNG_sPLT_SUPPORTED
2280 PNG_EXPORT(160, int, png_get_sPLT, (png_const_structrp png_ptr,
2281  png_inforp info_ptr, png_sPLT_tpp entries));
2282 #endif
2283 
2284 #ifdef PNG_sPLT_SUPPORTED
2285 PNG_EXPORT(161, void, png_set_sPLT, (png_const_structrp png_ptr,
2286  png_inforp info_ptr, png_const_sPLT_tp entries, int nentries));
2287 #endif
2288 
2289 #ifdef PNG_TEXT_SUPPORTED
2290 /* png_get_text also returns the number of text chunks in *num_text */
2291 PNG_EXPORT(162, int, png_get_text, (png_const_structrp png_ptr,
2292  png_inforp info_ptr, png_textp *text_ptr, int *num_text));
2293 #endif
2294 
2295 /* Note while png_set_text() will accept a structure whose text,
2296  * language, and translated keywords are NULL pointers, the structure
2297  * returned by png_get_text will always contain regular
2298  * zero-terminated C strings. They might be empty strings but
2299  * they will never be NULL pointers.
2300  */
2301 
2302 #ifdef PNG_TEXT_SUPPORTED
2303 PNG_EXPORT(163, void, png_set_text, (png_const_structrp png_ptr,
2304  png_inforp info_ptr, png_const_textp text_ptr, int num_text));
2305 #endif
2306 
2307 #ifdef PNG_tIME_SUPPORTED
2309  png_inforp info_ptr, png_timep *mod_time));
2310 #endif
2311 
2312 #ifdef PNG_tIME_SUPPORTED
2313 PNG_EXPORT(165, void, png_set_tIME, (png_const_structrp png_ptr,
2314  png_inforp info_ptr, png_const_timep mod_time));
2315 #endif
2316 
2317 #ifdef PNG_tRNS_SUPPORTED
2319  png_inforp info_ptr, png_bytep *trans_alpha, int *num_trans,
2320  png_color_16p *trans_color));
2321 #endif
2322 
2323 #ifdef PNG_tRNS_SUPPORTED
2324 PNG_EXPORT(167, void, png_set_tRNS, (png_structrp png_ptr,
2325  png_inforp info_ptr, png_const_bytep trans_alpha, int num_trans,
2326  png_const_color_16p trans_color));
2327 #endif
2328 
2329 #ifdef PNG_sCAL_SUPPORTED
2331  png_const_inforp info_ptr, int *unit, double *width, double *height))
2332 #if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \
2333  defined(PNG_FLOATING_POINT_SUPPORTED)
2334 /* NOTE: this API is currently implemented using floating point arithmetic,
2335  * consequently it can only be used on systems with floating point support.
2336  * In any case the range of values supported by png_fixed_point is small and it
2337  * is highly recommended that png_get_sCAL_s be used instead.
2338  */
2340  (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit,
2341  png_fixed_point *width, png_fixed_point *height))
2342 #endif
2344  (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit,
2345  png_charpp swidth, png_charpp sheight));
2346 
2347 PNG_FP_EXPORT(170, void, png_set_sCAL, (png_const_structrp png_ptr,
2348  png_inforp info_ptr, int unit, double width, double height))
2350  png_inforp info_ptr, int unit, png_fixed_point width,
2351  png_fixed_point height))
2352 PNG_EXPORT(171, void, png_set_sCAL_s, (png_const_structrp png_ptr,
2353  png_inforp info_ptr, int unit,
2354  png_const_charp swidth, png_const_charp sheight));
2355 #endif /* PNG_sCAL_SUPPORTED */
2356 
2357 #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
2358 /* Provide the default handling for all unknown chunks or, optionally, for
2359  * specific unknown chunks.
2360  *
2361  * NOTE: prior to 1.6.0 the handling specified for particular chunks on read was
2362  * ignored and the default was used, the per-chunk setting only had an effect on
2363  * write. If you wish to have chunk-specific handling on read in code that must
2364  * work on earlier versions you must use a user chunk callback to specify the
2365  * desired handling (keep or discard.)
2366  *
2367  * The 'keep' parameter is a PNG_HANDLE_CHUNK_ value as listed below. The
2368  * parameter is interpreted as follows:
2369  *
2370  * READ:
2371  * PNG_HANDLE_CHUNK_AS_DEFAULT:
2372  * Known chunks: do normal libpng processing, do not keep the chunk (but
2373  * see the comments below about PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
2374  * Unknown chunks: for a specific chunk use the global default, when used
2375  * as the default discard the chunk data.
2376  * PNG_HANDLE_CHUNK_NEVER:
2377  * Discard the chunk data.
2378  * PNG_HANDLE_CHUNK_IF_SAFE:
2379  * Keep the chunk data if the chunk is not critical else raise a chunk
2380  * error.
2381  * PNG_HANDLE_CHUNK_ALWAYS:
2382  * Keep the chunk data.
2383  *
2384  * If the chunk data is saved it can be retrieved using png_get_unknown_chunks,
2385  * below. Notice that specifying "AS_DEFAULT" as a global default is equivalent
2386  * to specifying "NEVER", however when "AS_DEFAULT" is used for specific chunks
2387  * it simply resets the behavior to the libpng default.
2388  *
2389  * INTERACTION WTIH USER CHUNK CALLBACKS:
2390  * The per-chunk handling is always used when there is a png_user_chunk_ptr
2391  * callback and the callback returns 0; the chunk is then always stored *unless*
2392  * it is critical and the per-chunk setting is other than ALWAYS. Notice that
2393  * the global default is *not* used in this case. (In effect the per-chunk
2394  * value is incremented to at least IF_SAFE.)
2395  *
2396  * IMPORTANT NOTE: this behavior will change in libpng 1.7 - the global and
2397  * per-chunk defaults will be honored. If you want to preserve the current
2398  * behavior when your callback returns 0 you must set PNG_HANDLE_CHUNK_IF_SAFE
2399  * as the default - if you don't do this libpng 1.6 will issue a warning.
2400  *
2401  * If you want unhandled unknown chunks to be discarded in libpng 1.6 and
2402  * earlier simply return '1' (handled).
2403  *
2404  * PNG_HANDLE_AS_UNKNOWN_SUPPORTED:
2405  * If this is *not* set known chunks will always be handled by libpng and
2406  * will never be stored in the unknown chunk list. Known chunks listed to
2407  * png_set_keep_unknown_chunks will have no effect. If it is set then known
2408  * chunks listed with a keep other than AS_DEFAULT will *never* be processed
2409  * by libpng, in addition critical chunks must either be processed by the
2410  * callback or saved.
2411  *
2412  * The IHDR and IEND chunks must not be listed. Because this turns off the
2413  * default handling for chunks that would otherwise be recognized the
2414  * behavior of libpng transformations may well become incorrect!
2415  *
2416  * WRITE:
2417  * When writing chunks the options only apply to the chunks specified by
2418  * png_set_unknown_chunks (below), libpng will *always* write known chunks
2419  * required by png_set_ calls and will always write the core critical chunks
2420  * (as required for PLTE).
2421  *
2422  * Each chunk in the png_set_unknown_chunks list is looked up in the
2423  * png_set_keep_unknown_chunks list to find the keep setting, this is then
2424  * interpreted as follows:
2425  *
2426  * PNG_HANDLE_CHUNK_AS_DEFAULT:
2427  * Write safe-to-copy chunks and write other chunks if the global
2428  * default is set to _ALWAYS, otherwise don't write this chunk.
2429  * PNG_HANDLE_CHUNK_NEVER:
2430  * Do not write the chunk.
2431  * PNG_HANDLE_CHUNK_IF_SAFE:
2432  * Write the chunk if it is safe-to-copy, otherwise do not write it.
2433  * PNG_HANDLE_CHUNK_ALWAYS:
2434  * Write the chunk.
2435  *
2436  * Note that the default behavior is effectively the opposite of the read case -
2437  * in read unknown chunks are not stored by default, in write they are written
2438  * by default. Also the behavior of PNG_HANDLE_CHUNK_IF_SAFE is very different
2439  * - on write the safe-to-copy bit is checked, on read the critical bit is
2440  * checked and on read if the chunk is critical an error will be raised.
2441  *
2442  * num_chunks:
2443  * ===========
2444  * If num_chunks is positive, then the "keep" parameter specifies the manner
2445  * for handling only those chunks appearing in the chunk_list array,
2446  * otherwise the chunk list array is ignored.
2447  *
2448  * If num_chunks is 0 the "keep" parameter specifies the default behavior for
2449  * unknown chunks, as described above.
2450  *
2451  * If num_chunks is negative, then the "keep" parameter specifies the manner
2452  * for handling all unknown chunks plus all chunks recognized by libpng
2453  * except for the IHDR, PLTE, tRNS, IDAT, and IEND chunks (which continue to
2454  * be processed by libpng.
2455  */
2457  int keep, png_const_bytep chunk_list, int num_chunks));
2458 
2459 /* The "keep" PNG_HANDLE_CHUNK_ parameter for the specified chunk is returned;
2460  * the result is therefore true (non-zero) if special handling is required,
2461  * false for the default handling.
2462  */
2464  png_const_bytep chunk_name));
2465 #endif
2466 
2467 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED
2469  png_inforp info_ptr, png_const_unknown_chunkp unknowns,
2470  int num_unknowns));
2471  /* NOTE: prior to 1.6.0 this routine set the 'location' field of the added
2472  * unknowns to the location currently stored in the png_struct. This is
2473  * invariably the wrong value on write. To fix this call the following API
2474  * for each chunk in the list with the correct location. If you know your
2475  * code won't be compiled on earlier versions you can rely on
2476  * png_set_unknown_chunks(write-ptr, png_get_unknown_chunks(read-ptr)) doing
2477  * the correct thing.
2478  */
2479 
2481  (png_const_structrp png_ptr, png_inforp info_ptr, int chunk, int location));
2482 
2484  png_inforp info_ptr, png_unknown_chunkpp entries));
2485 #endif
2486 
2487 /* Png_free_data() will turn off the "valid" flag for anything it frees.
2488  * If you need to turn it off for a chunk that your application has freed,
2489  * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);
2490  */
2491 PNG_EXPORT(177, void, png_set_invalid, (png_const_structrp png_ptr,
2492  png_inforp info_ptr, int mask));
2493 
2494 #ifdef PNG_INFO_IMAGE_SUPPORTED
2495 /* The "params" pointer is currently not used and is for future expansion. */
2496 PNG_EXPORT(178, void, png_read_png, (png_structrp png_ptr, png_inforp info_ptr,
2497  int transforms, png_voidp params));
2498 PNG_EXPORT(179, void, png_write_png, (png_structrp png_ptr, png_inforp info_ptr,
2499  int transforms, png_voidp params));
2500 #endif
2501 
2503  (png_const_structrp png_ptr));
2505  (png_const_structrp png_ptr));
2507  (png_const_structrp png_ptr));
2509  (png_const_structrp png_ptr));
2510 
2511 #ifdef PNG_MNG_FEATURES_SUPPORTED
2513  png_uint_32 mng_features_permitted));
2514 #endif
2515 
2516 /* For use in png_set_keep_unknown, added to version 1.2.6 */
2517 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0
2518 #define PNG_HANDLE_CHUNK_NEVER 1
2519 #define PNG_HANDLE_CHUNK_IF_SAFE 2
2520 #define PNG_HANDLE_CHUNK_ALWAYS 3
2521 #define PNG_HANDLE_CHUNK_LAST 4
2522 
2523 /* Strip the prepended error numbers ("#nnn ") from error and warning
2524  * messages before passing them to the error or warning handler.
2525  */
2526 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
2527 PNG_EXPORT(185, void, png_set_strip_error_numbers, (png_structrp png_ptr,
2528  png_uint_32 strip_mode));
2529 #endif
2530 
2531 /* Added in libpng-1.2.6 */
2532 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
2533 PNG_EXPORT(186, void, png_set_user_limits, (png_structrp png_ptr,
2534  png_uint_32 user_width_max, png_uint_32 user_height_max));
2536  (png_const_structrp png_ptr));
2538  (png_const_structrp png_ptr));
2539 /* Added in libpng-1.4.0 */
2540 PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structrp png_ptr,
2541  png_uint_32 user_chunk_cache_max));
2543  (png_const_structrp png_ptr));
2544 /* Added in libpng-1.4.1 */
2545 PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structrp png_ptr,
2546  png_alloc_size_t user_chunk_cache_max));
2548  (png_const_structrp png_ptr));
2549 #endif
2550 
2551 #if defined(PNG_INCH_CONVERSIONS_SUPPORTED)
2553  (png_const_structrp png_ptr, png_const_inforp info_ptr));
2554 
2556  (png_const_structrp png_ptr, png_const_inforp info_ptr));
2557 
2559  (png_const_structrp png_ptr, png_const_inforp info_ptr));
2560 
2562  (png_const_structrp png_ptr, png_const_inforp info_ptr))
2563 #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */
2565  (png_const_structrp png_ptr, png_const_inforp info_ptr))
2566 #endif
2567 
2569  png_const_inforp info_ptr))
2570 #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */
2572  (png_const_structrp png_ptr, png_const_inforp info_ptr))
2573 #endif
2574 
2575 # ifdef PNG_pHYs_SUPPORTED
2577  png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y,
2578  int *unit_type));
2579 # endif /* PNG_pHYs_SUPPORTED */
2580 #endif /* PNG_INCH_CONVERSIONS_SUPPORTED */
2581 
2582 /* Added in libpng-1.4.0 */
2583 #ifdef PNG_IO_STATE_SUPPORTED
2585 
2586 /* Removed from libpng 1.6; use png_get_io_chunk_type. */
2587 PNG_REMOVED(200, png_const_bytep, png_get_io_chunk_name, (png_structrp png_ptr),
2589 
2591  (png_const_structrp png_ptr));
2592 
2593 /* The flags returned by png_get_io_state() are the following: */
2594 # define PNG_IO_NONE 0x0000 /* no I/O at this moment */
2595 # define PNG_IO_READING 0x0001 /* currently reading */
2596 # define PNG_IO_WRITING 0x0002 /* currently writing */
2597 # define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */
2598 # define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */
2599 # define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */
2600 # define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */
2601 # define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */
2602 # define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */
2603 #endif /* ?PNG_IO_STATE_SUPPORTED */
2604 
2605 /* Interlace support. The following macros are always defined so that if
2606  * libpng interlace handling is turned off the macros may be used to handle
2607  * interlaced images within the application.
2608  */
2609 #define PNG_INTERLACE_ADAM7_PASSES 7
2610 
2611 /* Two macros to return the first row and first column of the original,
2612  * full, image which appears in a given pass. 'pass' is in the range 0
2613  * to 6 and the result is in the range 0 to 7.
2614  */
2615 #define PNG_PASS_START_ROW(pass) (((1&~(pass))<<(3-((pass)>>1)))&7)
2616 #define PNG_PASS_START_COL(pass) (((1& (pass))<<(3-(((pass)+1)>>1)))&7)
2617 
2618 /* A macro to return the offset between pixels in the output row for a pair of
2619  * pixels in the input - effectively the inverse of the 'COL_SHIFT' macro that
2620  * follows. Note that ROW_OFFSET is the offset from one row to the next whereas
2621  * COL_OFFSET is from one column to the next, within a row.
2622  */
2623 #define PNG_PASS_ROW_OFFSET(pass) ((pass)>2?(8>>(((pass)-1)>>1)):8)
2624 #define PNG_PASS_COL_OFFSET(pass) (1<<((7-(pass))>>1))
2625 
2626 /* Two macros to help evaluate the number of rows or columns in each
2627  * pass. This is expressed as a shift - effectively log2 of the number or
2628  * rows or columns in each 8x8 tile of the original image.
2629  */
2630 #define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3)
2631 #define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3)
2632 
2633 /* Hence two macros to determine the number of rows or columns in a given
2634  * pass of an image given its height or width. In fact these macros may
2635  * return non-zero even though the sub-image is empty, because the other
2636  * dimension may be empty for a small image.
2637  */
2638 #define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\
2639  -1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass))
2640 #define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\
2641  -1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass))
2642 
2643 /* For the reader row callbacks (both progressive and sequential) it is
2644  * necessary to find the row in the output image given a row in an interlaced
2645  * image, so two more macros:
2646  */
2647 #define PNG_ROW_FROM_PASS_ROW(y_in, pass) \
2648  (((y_in)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass))
2649 #define PNG_COL_FROM_PASS_COL(x_in, pass) \
2650  (((x_in)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass))
2651 
2652 /* Two macros which return a boolean (0 or 1) saying whether the given row
2653  * or column is in a particular pass. These use a common utility macro that
2654  * returns a mask for a given pass - the offset 'off' selects the row or
2655  * column version. The mask has the appropriate bit set for each column in
2656  * the tile.
2657  */
2658 #define PNG_PASS_MASK(pass,off) ( \
2659  ((0x110145AF>>(((7-(off))-(pass))<<2)) & 0xF) | \
2660  ((0x01145AF0>>(((7-(off))-(pass))<<2)) & 0xF0))
2661 
2662 #define PNG_ROW_IN_INTERLACE_PASS(y, pass) \
2663  ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1)
2664 #define PNG_COL_IN_INTERLACE_PASS(x, pass) \
2665  ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1)
2666 
2667 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
2668 /* With these routines we avoid an integer divide, which will be slower on
2669  * most machines. However, it does take more operations than the corresponding
2670  * divide method, so it may be slower on a few RISC systems. There are two
2671  * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
2672  *
2673  * Note that the rounding factors are NOT supposed to be the same! 128 and
2674  * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
2675  * standard method.
2676  *
2677  * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
2678  */
2679 
2680  /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2681 
2682 # define png_composite(composite, fg, alpha, bg) \
2683  { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \
2684  * (png_uint_16)(alpha) \
2685  + (png_uint_16)(bg)*(png_uint_16)(255 \
2686  - (png_uint_16)(alpha)) + 128); \
2687  (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
2688 
2689 # define png_composite_16(composite, fg, alpha, bg) \
2690  { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \
2691  * (png_uint_32)(alpha) \
2692  + (png_uint_32)(bg)*(65535 \
2693  - (png_uint_32)(alpha)) + 32768); \
2694  (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
2695 
2696 #else /* Standard method using integer division */
2697 
2698 # define png_composite(composite, fg, alpha, bg) \
2699  (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
2700  (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2701  127) / 255)
2702 
2703 # define png_composite_16(composite, fg, alpha, bg) \
2704  (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
2705  (png_uint_32)(bg)*(png_uint_32)(65535 - (png_uint_32)(alpha)) + \
2706  32767) / 65535)
2707 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
2708 
2709 #ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED
2710 PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf));
2713 #endif
2714 
2715 PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_const_structrp png_ptr,
2716  png_const_bytep buf));
2717 /* No png_get_int_16 -- may be added if there's a real need for it. */
2718 
2719 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). */
2720 #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED
2721 PNG_EXPORT(205, void, png_save_uint_32, (png_bytep buf, png_uint_32 i));
2722 #endif
2723 #ifdef PNG_SAVE_INT_32_SUPPORTED
2724 PNG_EXPORT(206, void, png_save_int_32, (png_bytep buf, png_int_32 i));
2725 #endif
2726 
2727 /* Place a 16-bit number into a buffer in PNG byte order.
2728  * The parameter is declared unsigned int, not png_uint_16,
2729  * just to avoid potential problems on pre-ANSI C compilers.
2730  */
2731 #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED
2732 PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i));
2733 /* No png_save_int_16 -- may be added if there's a real need for it. */
2734 #endif
2735 
2736 #ifdef PNG_USE_READ_MACROS
2737 /* Inline macros to do direct reads of bytes from the input buffer.
2738  * The png_get_int_32() routine assumes we are using two's complement
2739  * format for negative values, which is almost certainly true.
2740  */
2741 # define PNG_get_uint_32(buf) \
2742  (((png_uint_32)(*(buf)) << 24) + \
2743  ((png_uint_32)(*((buf) + 1)) << 16) + \
2744  ((png_uint_32)(*((buf) + 2)) << 8) + \
2745  ((png_uint_32)(*((buf) + 3))))
2746 
2747  /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the
2748  * function) incorrectly returned a value of type png_uint_32.
2749  */
2750 # define PNG_get_uint_16(buf) \
2751  ((png_uint_16) \
2752  (((unsigned int)(*(buf)) << 8) + \
2753  ((unsigned int)(*((buf) + 1)))))
2754 
2755 # define PNG_get_int_32(buf) \
2756  ((png_int_32)((*(buf) & 0x80) \
2757  ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \
2758  : (png_int_32)png_get_uint_32(buf)))
2759 
2760  /* If PNG_PREFIX is defined the same thing as below happens in pnglibconf.h,
2761  * but defining a macro name prefixed with PNG_PREFIX.
2762  */
2763 # ifndef PNG_PREFIX
2764 # define png_get_uint_32(buf) PNG_get_uint_32(buf)
2765 # define png_get_uint_16(buf) PNG_get_uint_16(buf)
2766 # define png_get_int_32(buf) PNG_get_int_32(buf)
2767 # endif
2768 #else
2769 # ifdef PNG_PREFIX
2770  /* No macros; revert to the (redefined) function */
2771 # define PNG_get_uint_32 (png_get_uint_32)
2772 # define PNG_get_uint_16 (png_get_uint_16)
2773 # define PNG_get_int_32 (png_get_int_32)
2774 # endif
2775 #endif
2776 
2777 /*******************************************************************************
2778  * SIMPLIFIED API
2779  *******************************************************************************
2780  *
2781  * Please read the documentation in libpng-manual.txt (TODO: write said
2782  * documentation) if you don't understand what follows.
2783  *
2784  * The simplified API hides the details of both libpng and the PNG file format
2785  * itself. It allows PNG files to be read into a very limited number of
2786  * in-memory bitmap formats or to be written from the same formats. If these
2787  * formats do not accomodate your needs then you can, and should, use the more
2788  * sophisticated APIs above - these support a wide variety of in-memory formats
2789  * and a wide variety of sophisticated transformations to those formats as well
2790  * as a wide variety of APIs to manipulate ancillary information.
2791  *
2792  * To read a PNG file using the simplified API:
2793  *
2794  * 1) Declare a 'png_image' structure (see below) on the stack and set the
2795  * version field to PNG_IMAGE_VERSION.
2796  * 2) Call the appropriate png_image_begin_read... function.
2797  * 3) Set the png_image 'format' member to the required sample format.
2798  * 4) Allocate a buffer for the image and, if required, the color-map.
2799  * 5) Call png_image_finish_read to read the image and, if required, the
2800  * color-map into your buffers.
2801  *
2802  * There are no restrictions on the format of the PNG input itself; all valid
2803  * color types, bit depths, and interlace methods are acceptable, and the
2804  * input image is transformed as necessary to the requested in-memory format
2805  * during the png_image_finish_read() step. The only caveat is that if you
2806  * request a color-mapped image from a PNG that is full-color or makes
2807  * complex use of an alpha channel the transformation is extremely lossy and the
2808  * result may look terrible.
2809  *
2810  * To write a PNG file using the simplified API:
2811  *
2812  * 1) Declare a 'png_image' structure on the stack and memset() it to all zero.
2813  * 2) Initialize the members of the structure that describe the image, setting
2814  * the 'format' member to the format of the image samples.
2815  * 3) Call the appropriate png_image_write... function with a pointer to the
2816  * image and, if necessary, the color-map to write the PNG data.
2817  *
2818  * png_image is a structure that describes the in-memory format of an image
2819  * when it is being read or defines the in-memory format of an image that you
2820  * need to write:
2821  */
2822 #define PNG_IMAGE_VERSION 1
2823 
2824 typedef struct png_control *png_controlp;
2825 typedef struct
2826 {
2827  png_controlp opaque; /* Initialize to NULL, free with png_image_free */
2828  png_uint_32 version; /* Set to PNG_IMAGE_VERSION */
2829  png_uint_32 width; /* Image width in pixels (columns) */
2830  png_uint_32 height; /* Image height in pixels (rows) */
2831  png_uint_32 format; /* Image format as defined below */
2832  png_uint_32 flags; /* A bit mask containing informational flags */
2833  png_uint_32 colormap_entries;
2834  /* Number of entries in the color-map */
2835 
2836  /* In the event of an error or warning the following field will be set to a
2837  * non-zero value and the 'message' field will contain a '\0' terminated
2838  * string with the libpng error or warning message. If both warnings and
2839  * an error were encountered, only the error is recorded. If there
2840  * are multiple warnings, only the first one is recorded.
2841  *
2842  * The upper 30 bits of this value are reserved, the low two bits contain
2843  * a value as follows:
2844  */
2845 # define PNG_IMAGE_WARNING 1
2846 # define PNG_IMAGE_ERROR 2
2847  /*
2848  * The result is a two bit code such that a value more than 1 indicates
2849  * a failure in the API just called:
2850  *
2851  * 0 - no warning or error
2852  * 1 - warning
2853  * 2 - error
2854  * 3 - error preceded by warning
2855  */
2856 # define PNG_IMAGE_FAILED(png_cntrl) ((((png_cntrl).warning_or_error)&0x03)>1)
2857 
2858  png_uint_32 warning_or_error;
2859 
2860  char message[64];
2861 } png_image, *png_imagep;
2862 
2863 /* The samples of the image have one to four channels whose components have
2864  * original values in the range 0 to 1.0:
2865  *
2866  * 1: A single gray or luminance channel (G).
2867  * 2: A gray/luminance channel and an alpha channel (GA).
2868  * 3: Three red, green, blue color channels (RGB).
2869  * 4: Three color channels and an alpha channel (RGBA).
2870  *
2871  * The components are encoded in one of two ways:
2872  *
2873  * a) As a small integer, value 0..255, contained in a single byte. For the
2874  * alpha channel the original value is simply value/255. For the color or
2875  * luminance channels the value is encoded according to the sRGB specification
2876  * and matches the 8-bit format expected by typical display devices.
2877  *
2878  * The color/gray channels are not scaled (pre-multiplied) by the alpha
2879  * channel and are suitable for passing to color management software.
2880  *
2881  * b) As a value in the range 0..65535, contained in a 2-byte integer. All
2882  * channels can be converted to the original value by dividing by 65535; all
2883  * channels are linear. Color channels use the RGB encoding (RGB end-points) of
2884  * the sRGB specification. This encoding is identified by the
2885  * PNG_FORMAT_FLAG_LINEAR flag below.
2886  *
2887  * When the simplified API needs to convert between sRGB and linear colorspaces,
2888  * the actual sRGB transfer curve defined in the sRGB specification (see the
2889  * article at http://en.wikipedia.org/wiki/SRGB) is used, not the gamma=1/2.2
2890  * approximation used elsewhere in libpng.
2891  *
2892  * When an alpha channel is present it is expected to denote pixel coverage
2893  * of the color or luminance channels and is returned as an associated alpha
2894  * channel: the color/gray channels are scaled (pre-multiplied) by the alpha
2895  * value.
2896  *
2897  * The samples are either contained directly in the image data, between 1 and 8
2898  * bytes per pixel according to the encoding, or are held in a color-map indexed
2899  * by bytes in the image data. In the case of a color-map the color-map entries
2900  * are individual samples, encoded as above, and the image data has one byte per
2901  * pixel to select the relevant sample from the color-map.
2902  */
2903 
2904 /* PNG_FORMAT_*
2905  *
2906  * #defines to be used in png_image::format. Each #define identifies a
2907  * particular layout of sample data and, if present, alpha values. There are
2908  * separate defines for each of the two component encodings.
2909  *
2910  * A format is built up using single bit flag values. All combinations are
2911  * valid. Formats can be built up from the flag values or you can use one of
2912  * the predefined values below. When testing formats always use the FORMAT_FLAG
2913  * macros to test for individual features - future versions of the library may
2914  * add new flags.
2915  *
2916  * When reading or writing color-mapped images the format should be set to the
2917  * format of the entries in the color-map then png_image_{read,write}_colormap
2918  * called to read or write the color-map and set the format correctly for the
2919  * image data. Do not set the PNG_FORMAT_FLAG_COLORMAP bit directly!
2920  *
2921  * NOTE: libpng can be built with particular features disabled, if you see
2922  * compiler errors because the definition of one of the following flags has been
2923  * compiled out it is because libpng does not have the required support. It is
2924  * possible, however, for the libpng configuration to enable the format on just
2925  * read or just write; in that case you may see an error at run time. You can
2926  * guard against this by checking for the definition of the appropriate
2927  * "_SUPPORTED" macro, one of:
2928  *
2929  * PNG_SIMPLIFIED_{READ,WRITE}_{BGR,AFIRST}_SUPPORTED
2930  */
2931 #define PNG_FORMAT_FLAG_ALPHA 0x01U /* format with an alpha channel */
2932 #define PNG_FORMAT_FLAG_COLOR 0x02U /* color format: otherwise grayscale */
2933 #define PNG_FORMAT_FLAG_LINEAR 0x04U /* 2 byte channels else 1 byte */
2934 #define PNG_FORMAT_FLAG_COLORMAP 0x08U /* image data is color-mapped */
2935 
2936 #ifdef PNG_FORMAT_BGR_SUPPORTED
2937 # define PNG_FORMAT_FLAG_BGR 0x10U /* BGR colors, else order is RGB */
2938 #endif
2939 
2940 #ifdef PNG_FORMAT_AFIRST_SUPPORTED
2941 # define PNG_FORMAT_FLAG_AFIRST 0x20U /* alpha channel comes first */
2942 #endif
2943 
2944 /* Commonly used formats have predefined macros.
2945  *
2946  * First the single byte (sRGB) formats:
2947  */
2948 #define PNG_FORMAT_GRAY 0
2949 #define PNG_FORMAT_GA PNG_FORMAT_FLAG_ALPHA
2950 #define PNG_FORMAT_AG (PNG_FORMAT_GA|PNG_FORMAT_FLAG_AFIRST)
2951 #define PNG_FORMAT_RGB PNG_FORMAT_FLAG_COLOR
2952 #define PNG_FORMAT_BGR (PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_BGR)
2953 #define PNG_FORMAT_RGBA (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_ALPHA)
2954 #define PNG_FORMAT_ARGB (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_AFIRST)
2955 #define PNG_FORMAT_BGRA (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_ALPHA)
2956 #define PNG_FORMAT_ABGR (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_AFIRST)
2957 
2958 /* Then the linear 2-byte formats. When naming these "Y" is used to
2959  * indicate a luminance (gray) channel.
2960  */
2961 #define PNG_FORMAT_LINEAR_Y PNG_FORMAT_FLAG_LINEAR
2962 #define PNG_FORMAT_LINEAR_Y_ALPHA (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_ALPHA)
2963 #define PNG_FORMAT_LINEAR_RGB (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR)
2964 #define PNG_FORMAT_LINEAR_RGB_ALPHA \
2965  (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA)
2966 
2967 /* With color-mapped formats the image data is one byte for each pixel, the byte
2968  * is an index into the color-map which is formatted as above. To obtain a
2969  * color-mapped format it is sufficient just to add the PNG_FOMAT_FLAG_COLORMAP
2970  * to one of the above definitions, or you can use one of the definitions below.
2971  */
2972 #define PNG_FORMAT_RGB_COLORMAP (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_COLORMAP)
2973 #define PNG_FORMAT_BGR_COLORMAP (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_COLORMAP)
2974 #define PNG_FORMAT_RGBA_COLORMAP (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_COLORMAP)
2975 #define PNG_FORMAT_ARGB_COLORMAP (PNG_FORMAT_ARGB|PNG_FORMAT_FLAG_COLORMAP)
2976 #define PNG_FORMAT_BGRA_COLORMAP (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_COLORMAP)
2977 #define PNG_FORMAT_ABGR_COLORMAP (PNG_FORMAT_ABGR|PNG_FORMAT_FLAG_COLORMAP)
2978 
2979 /* PNG_IMAGE macros
2980  *
2981  * These are convenience macros to derive information from a png_image
2982  * structure. The PNG_IMAGE_SAMPLE_ macros return values appropriate to the
2983  * actual image sample values - either the entries in the color-map or the
2984  * pixels in the image. The PNG_IMAGE_PIXEL_ macros return corresponding values
2985  * for the pixels and will always return 1 for color-mapped formats. The
2986  * remaining macros return information about the rows in the image and the
2987  * complete image.
2988  *
2989  * NOTE: All the macros that take a png_image::format parameter are compile time
2990  * constants if the format parameter is, itself, a constant. Therefore these
2991  * macros can be used in array declarations and case labels where required.
2992  * Similarly the macros are also pre-processor constants (sizeof is not used) so
2993  * they can be used in #if tests.
2994  *
2995  * First the information about the samples.
2996  */
2997 #define PNG_IMAGE_SAMPLE_CHANNELS(fmt)\
2998  (((fmt)&(PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA))+1)
2999  /* Return the total number of channels in a given format: 1..4 */
3000 
3001 #define PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)\
3002  ((((fmt) & PNG_FORMAT_FLAG_LINEAR) >> 2)+1)
3003  /* Return the size in bytes of a single component of a pixel or color-map
3004  * entry (as appropriate) in the image: 1 or 2.
3005  */
3006 
3007 #define PNG_IMAGE_SAMPLE_SIZE(fmt)\
3008  (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt))
3009  /* This is the size of the sample data for one sample. If the image is
3010  * color-mapped it is the size of one color-map entry (and image pixels are
3011  * one byte in size), otherwise it is the size of one image pixel.
3012  */
3013 
3014 #define PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(fmt)\
3015  (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * 256)
3016  /* The maximum size of the color-map required by the format expressed in a
3017  * count of components. This can be used to compile-time allocate a
3018  * color-map:
3019  *
3020  * png_uint_16 colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(linear_fmt)];
3021  *
3022  * png_byte colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(sRGB_fmt)];
3023  *
3024  * Alternatively use the PNG_IMAGE_COLORMAP_SIZE macro below to use the
3025  * information from one of the png_image_begin_read_ APIs and dynamically
3026  * allocate the required memory.
3027  */
3028 
3029 /* Corresponding information about the pixels */
3030 #define PNG_IMAGE_PIXEL_(test,fmt)\
3031  (((fmt)&PNG_FORMAT_FLAG_COLORMAP)?1:test(fmt))
3032 
3033 #define PNG_IMAGE_PIXEL_CHANNELS(fmt)\
3034  PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_CHANNELS,fmt)
3035  /* The number of separate channels (components) in a pixel; 1 for a
3036  * color-mapped image.
3037  */
3038 
3039 #define PNG_IMAGE_PIXEL_COMPONENT_SIZE(fmt)\
3040  PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_COMPONENT_SIZE,fmt)
3041  /* The size, in bytes, of each component in a pixel; 1 for a color-mapped
3042  * image.
3043  */
3044 
3045 #define PNG_IMAGE_PIXEL_SIZE(fmt) PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_SIZE,fmt)
3046  /* The size, in bytes, of a complete pixel; 1 for a color-mapped image. */
3047 
3048 /* Information about the whole row, or whole image */
3049 #define PNG_IMAGE_ROW_STRIDE(image)\
3050  (PNG_IMAGE_PIXEL_CHANNELS((image).format) * (image).width)
3051  /* Return the total number of components in a single row of the image; this
3052  * is the minimum 'row stride', the minimum count of components between each
3053  * row. For a color-mapped image this is the minimum number of bytes in a
3054  * row.
3055  */
3056 
3057 #define PNG_IMAGE_BUFFER_SIZE(image, row_stride)\
3058  (PNG_IMAGE_PIXEL_COMPONENT_SIZE((image).format)*(image).height*(row_stride))
3059  /* Return the size, in bytes, of an image buffer given a png_image and a row
3060  * stride - the number of components to leave space for in each row.
3061  */
3062 
3063 #define PNG_IMAGE_SIZE(image)\
3064  PNG_IMAGE_BUFFER_SIZE(image, PNG_IMAGE_ROW_STRIDE(image))
3065  /* Return the size, in bytes, of the image in memory given just a png_image;
3066  * the row stride is the minimum stride required for the image.
3067  */
3068 
3069 #define PNG_IMAGE_COLORMAP_SIZE(image)\
3070  (PNG_IMAGE_SAMPLE_SIZE((image).format) * (image).colormap_entries)
3071  /* Return the size, in bytes, of the color-map of this image. If the image
3072  * format is not a color-map format this will return a size sufficient for
3073  * 256 entries in the given format; check PNG_FORMAT_FLAG_COLORMAP if
3074  * you don't want to allocate a color-map in this case.
3075  */
3076 
3077 /* PNG_IMAGE_FLAG_*
3078  *
3079  * Flags containing additional information about the image are held in the
3080  * 'flags' field of png_image.
3081  */
3082 #define PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB 0x01
3083  /* This indicates the the RGB values of the in-memory bitmap do not
3084  * correspond to the red, green and blue end-points defined by sRGB.
3085  */
3086 
3087 #define PNG_IMAGE_FLAG_FAST 0x02
3088  /* On write emphasise speed over compression; the resultant PNG file will be
3089  * larger but will be produced significantly faster, particular for large
3090  * images. Do not use this option for images which will be distributed, only
3091  * used it when producing intermediate files that will be read back in
3092  * repeatedly. For a typical 24-bit image the option will double the read
3093  * speed at the cost of increasing the image size by 25%, however for many
3094  * more compressible images the PNG file can be 10 times larger with only a
3095  * slight speed gain.
3096  */
3097 
3098 #define PNG_IMAGE_FLAG_16BIT_sRGB 0x04
3099  /* On read if the image is a 16-bit per component image and there is no gAMA
3100  * or sRGB chunk assume that the components are sRGB encoded. Notice that
3101  * images output by the simplified API always have gamma information; setting
3102  * this flag only affects the interpretation of 16-bit images from an
3103  * external source. It is recommended that the application expose this flag
3104  * to the user; the user can normally easily recognize the difference between
3105  * linear and sRGB encoding. This flag has no effect on write - the data
3106  * passed to the write APIs must have the correct encoding (as defined
3107  * above.)
3108  *
3109  * If the flag is not set (the default) input 16-bit per component data is
3110  * assumed to be linear.
3111  *
3112  * NOTE: the flag can only be set after the png_image_begin_read_ call,
3113  * because that call initializes the 'flags' field.
3114  */
3115 
3116 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED
3117 /* READ APIs
3118  * ---------
3119  *
3120  * The png_image passed to the read APIs must have been initialized by setting
3121  * the png_controlp field 'opaque' to NULL (or, safer, memset the whole thing.)
3122  */
3123 #ifdef PNG_STDIO_SUPPORTED
3124 PNG_EXPORT(234, int, png_image_begin_read_from_file, (png_imagep image,
3125  const char *file_name));
3126  /* The named file is opened for read and the image header is filled in
3127  * from the PNG header in the file.
3128  */
3129 
3130 PNG_EXPORT(235, int, png_image_begin_read_from_stdio, (png_imagep image,
3131  FILE* file));
3132  /* The PNG header is read from the stdio FILE object. */
3133 #endif /* PNG_STDIO_SUPPORTED */
3134 
3135 PNG_EXPORT(236, int, png_image_begin_read_from_memory, (png_imagep image,
3136  png_const_voidp memory, png_size_t size));
3137  /* The PNG header is read from the given memory buffer. */
3138 
3139 PNG_EXPORT(237, int, png_image_finish_read, (png_imagep image,
3140  png_const_colorp background, void *buffer, png_int_32 row_stride,
3141  void *colormap));
3142  /* Finish reading the image into the supplied buffer and clean up the
3143  * png_image structure.
3144  *
3145  * row_stride is the step, in byte or 2-byte units as appropriate,
3146  * between adjacent rows. A positive stride indicates that the top-most row
3147  * is first in the buffer - the normal top-down arrangement. A negative
3148  * stride indicates that the bottom-most row is first in the buffer.
3149  *
3150  * background need only be supplied if an alpha channel must be removed from
3151  * a png_byte format and the removal is to be done by compositing on a solid
3152  * color; otherwise it may be NULL and any composition will be done directly
3153  * onto the buffer. The value is an sRGB color to use for the background,
3154  * for grayscale output the green channel is used.
3155  *
3156  * background must be supplied when an alpha channel must be removed from a
3157  * single byte color-mapped output format, in other words if:
3158  *
3159  * 1) The original format from png_image_begin_read_from_* had
3160  * PNG_FORMAT_FLAG_ALPHA set.
3161  * 2) The format set by the application does not.
3162  * 3) The format set by the application has PNG_FORMAT_FLAG_COLORMAP set and
3163  * PNG_FORMAT_FLAG_LINEAR *not* set.
3164  *
3165  * For linear output removing the alpha channel is always done by compositing
3166  * on black and background is ignored.
3167  *
3168  * colormap must be supplied when PNG_FORMAT_FLAG_COLORMAP is set. It must
3169  * be at least the size (in bytes) returned by PNG_IMAGE_COLORMAP_SIZE.
3170  * image->colormap_entries will be updated to the actual number of entries
3171  * written to the colormap; this may be less than the original value.
3172  */
3173 
3174 PNG_EXPORT(238, void, png_image_free, (png_imagep image));
3175  /* Free any data allocated by libpng in image->opaque, setting the pointer to
3176  * NULL. May be called at any time after the structure is initialized.
3177  */
3178 #endif /* PNG_SIMPLIFIED_READ_SUPPORTED */
3179 
3180 #ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED
3181 /* WRITE APIS
3182  * ----------
3183  * For write you must initialize a png_image structure to describe the image to
3184  * be written. To do this use memset to set the whole structure to 0 then
3185  * initialize fields describing your image.
3186  *
3187  * version: must be set to PNG_IMAGE_VERSION
3188  * opaque: must be initialized to NULL
3189  * width: image width in pixels
3190  * height: image height in rows
3191  * format: the format of the data (image and color-map) you wish to write
3192  * flags: set to 0 unless one of the defined flags applies; set
3193  * PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB for color format images where the RGB
3194  * values do not correspond to the colors in sRGB.
3195  * colormap_entries: set to the number of entries in the color-map (0 to 256)
3196  */
3197 PNG_EXPORT(239, int, png_image_write_to_file, (png_imagep image,
3198  const char *file, int convert_to_8bit, const void *buffer,
3199  png_int_32 row_stride, const void *colormap));
3200  /* Write the image to the named file. */
3201 
3202 PNG_EXPORT(240, int, png_image_write_to_stdio, (png_imagep image, FILE *file,
3203  int convert_to_8_bit, const void *buffer, png_int_32 row_stride,
3204  const void *colormap));
3205  /* Write the image to the given (FILE*). */
3206 
3207 /* With both write APIs if image is in one of the linear formats with 16-bit
3208  * data then setting convert_to_8_bit will cause the output to be an 8-bit PNG
3209  * gamma encoded according to the sRGB specification, otherwise a 16-bit linear
3210  * encoded PNG file is written.
3211  *
3212  * With color-mapped data formats the colormap parameter point to a color-map
3213  * with at least image->colormap_entries encoded in the specified format. If
3214  * the format is linear the written PNG color-map will be converted to sRGB
3215  * regardless of the convert_to_8_bit flag.
3216  *
3217  * With all APIs row_stride is handled as in the read APIs - it is the spacing
3218  * from one row to the next in component sized units (1 or 2 bytes) and if
3219  * negative indicates a bottom-up row layout in the buffer.
3220  *
3221  * Note that the write API does not support interlacing or sub-8-bit pixels.
3222  */
3223 #endif /* PNG_SIMPLIFIED_WRITE_SUPPORTED */
3224 /*******************************************************************************
3225  * END OF SIMPLIFIED API
3226  ******************************************************************************/
3227 
3228 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
3230  (png_structrp png_ptr, int allowed));
3231 # ifdef PNG_GET_PALETTE_MAX_SUPPORTED
3233  png_const_infop info_ptr));
3234 # endif
3235 #endif /* CHECK_FOR_INVALID_INDEX */
3236 
3237 /*******************************************************************************
3238  * IMPLEMENTATION OPTIONS
3239  *******************************************************************************
3240  *
3241  * Support for arbitrary implementation-specific optimizations. The API allows
3242  * particular options to be turned on or off. 'Option' is the number of the
3243  * option and 'onoff' is 0 (off) or non-0 (on). The value returned is given
3244  * by the PNG_OPTION_ defines below.
3245  *
3246  * HARDWARE: normally hardware capabilites, such as the Intel SSE instructions,
3247  * are detected at run time, however sometimes it may be impossible
3248  * to do this in user mode, in which case it is necessary to discover
3249  * the capabilities in an OS specific way. Such capabilities are
3250  * listed here when libpng has support for them and must be turned
3251  * ON by the application if present.
3252  *
3253  * SOFTWARE: sometimes software optimizations actually result in performance
3254  * decrease on some architectures or systems, or with some sets of
3255  * PNG images. 'Software' options allow such optimizations to be
3256  * selected at run time.
3257  */
3258 #ifdef PNG_SET_OPTION_SUPPORTED
3259 #ifdef PNG_ARM_NEON_API_SUPPORTED
3260 # define PNG_ARM_NEON 0 /* HARDWARE: ARM Neon SIMD instructions supported */
3261 #endif
3262 #define PNG_OPTION_NEXT 2 /* Next option - numbers must be even */
3263 
3264 /* Return values: NOTE: there are four values and 'off' is *not* zero */
3265 #define PNG_OPTION_UNSET 0 /* Unset - defaults to off */
3266 #define PNG_OPTION_INVALID 1 /* Option number out of range */
3267 #define PNG_OPTION_OFF 2
3268 #define PNG_OPTION_ON 3
3269 
3270 PNG_EXPORT(244, int, png_set_option, (png_structrp png_ptr, int option,
3271  int onoff));
3272 #endif
3273 
3274 /*******************************************************************************
3275  * END OF HARDWARE OPTIONS
3276  ******************************************************************************/
3277 
3278 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project
3279  * defs, scripts/pnglibconf.h, and scripts/pnglibconf.h.prebuilt
3280  */
3281 
3282 /* The last ordinal number (this is the *last* one already used; the next
3283  * one to use is one more than this.) Maintainer, remember to add an entry to
3284  * scripts/symbols.def as well.
3285  */
3286 #ifdef PNG_EXPORT_LAST_ORDINAL
3287  PNG_EXPORT_LAST_ORDINAL(244);
3288 #endif
3289 
3290 #endif /* PNG_VERSION_INFO_ONLY */
3291 /* Do not put anything past this line */
3292 #endif /* PNG_H */
void PNGAPI png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, double white_x, double white_y, double red_x, double red_y, double green_x, double green_y, double blue_x, double blue_y)
Definition: juce_PNGLoader.cpp:101
png_const_structrp png_const_inforp double double double double double double double double double *blue_Z png_const_structrp png_const_inforp png_fixed_point png_fixed_point * int_red_Y
Definition: juce_PNGLoader.cpp:2136
void PNGAPI png_set_add_alpha(png_structrp png_ptr, png_uint_32 filler, int filler_loc)
Definition: juce_PNGLoader.cpp:202
#define png_get_uint_16(buf)
Definition: png.h:2765
png_const_structrp png_const_inforp double double double * red_Z
Definition: juce_PNGLoader.cpp:2126
void PNGAPI png_read_rows(png_structrp png_ptr, png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)
Definition: juce_PNGLoader.cpp:568
png_uint_32 PNGAPI png_get_sCAL_s(png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, png_charpp width, png_charpp height)
Definition: juce_PNGLoader.cpp:889
#define png_warning(s1, s2)
Definition: pngpriv.h:288
png_byte PNGAPI png_get_rgb_to_gray_status(png_const_structrp png_ptr)
Definition: juce_PNGLoader.cpp:1082
png_byte blue
Definition: png.h:598
png_byte PNGAPI png_get_interlace_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:97
void PNGAPI png_set_crc_action(png_structrp png_ptr, int crit_action, int ancil_action)
Definition: juce_PNGLoader.cpp:25
struct png_time_struct png_time
void PNGAPI png_write_chunk_data(png_structrp png_ptr, png_const_bytep data, png_size_t length)
Definition: juce_PNGLoader.cpp:127
void PNGAPI png_save_uint_16(png_bytep buf, unsigned int i)
Definition: juce_PNGLoader.cpp:37
png_structrp png_const_color_16p int int need_expand
Definition: juce_PNGLoader.cpp:1467
Definition: png.h:846
png_structrp int png_fixed_point red
Definition: juce_PNGLoader.cpp:1173
void * png_voidp
Definition: pngconf.h:570
png_uint_32 width
Definition: png.h:2829
png_structrp png_ptr
Definition: juce_PNGLoader.cpp:1173
png_const_bytep PNGAPI png_get_signature(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:446
float PNGAPI png_get_x_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:369
void PNGAPI png_write_info_before_PLTE(png_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:84
struct png_sPLT_entry_struct png_sPLT_entry
png_structrp int heuristic_method
Definition: juce_PNGLoader.cpp:1678
int PNGAPI png_reset_zstream(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:873
void PNGAPI png_set_check_for_invalid_index(png_structrp png_ptr, int allowed)
Definition: juce_PNGLoader.cpp:1595
const char * png_const_charp
Definition: pngconf.h:583
#define PNG_ALLOCATED
#define png_get_uint_32(buf)
Definition: png.h:2764
void PNGAPI png_progressive_combine_row(png_const_structrp png_ptr, png_bytep old_row, png_const_bytep new_row)
Definition: juce_PNGLoader.cpp:1253
void PNGAPI png_set_read_status_fn(png_structrp png_ptr, png_read_status_ptr read_row_fn)
Definition: juce_PNGLoader.cpp:923
int PNGAPI png_get_unknown_chunks(png_const_structrp png_ptr, png_inforp info_ptr, png_unknown_chunkpp unknowns)
Definition: juce_PNGLoader.cpp:1067
png_set_sCAL_fixed
Definition: juce_PNGLoader.cpp:2349
void PNGFAPI png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr, png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x, png_fixed_point blue_y)
Definition: juce_PNGLoader.cpp:40
png_uint_32 PNGAPI png_permit_mng_features(png_structrp png_ptr, png_uint_32 mng_features)
Definition: juce_PNGLoader.cpp:1243
void PNGAPI png_data_freer(png_const_structrp png_ptr, png_inforp info_ptr, int freer, png_uint_32 mask)
Definition: juce_PNGLoader.cpp:420
png_byte red
Definition: png.h:596
void PNGAPI png_set_filter_heuristics(png_structrp png_ptr, int heuristic_method, int num_weights, png_const_doublep filter_weights, png_const_doublep filter_costs)
Definition: juce_PNGLoader.cpp:1174
void PNGAPI png_write_sig(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:51
png_bytepp PNGAPI png_get_rows(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:40
png_controlp opaque
Definition: png.h:2827
png_size_t PNGAPI png_get_rowbytes(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:30
png_uint_16(PNGAPI png_get_uint_16)(png_const_bytep buf)
Definition: juce_PNGLoader.cpp:98
png_const_charp PNGAPI png_get_header_ver(png_const_structrp png_ptr)
Definition: png.c:801
void PNGAPI png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
Definition: juce_PNGLoader.cpp:598
png_uint_32 PNGAPI png_get_image_width(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:52
png_uint_32 PNGAPI png_get_chunk_cache_max(png_const_structrp png_ptr)
Definition: juce_PNGLoader.cpp:1136
const png_sPLT_t * png_const_sPLT_tp
Definition: png.h:635
void PNGAPI png_set_write_fn(png_structrp png_ptr, png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
Definition: juce_PNGLoader.cpp:122
png_byte PNGAPI png_get_channels(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:436
void PNGAPI png_set_text_compression_method(png_structrp png_ptr, int method)
Definition: juce_PNGLoader.cpp:1437
void PNGAPI png_read_image(png_structrp png_ptr, png_bytepp image)
Definition: juce_PNGLoader.cpp:623
#define PNGCAPI
png_int_32 PNGAPI png_get_y_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:270
void PNGAPI png_set_expand(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:852
#define PNG_FUNCTION(type, name, args, attributes)
void PNGAPI png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)
Definition: juce_PNGLoader.cpp:897
png_uint_32 PNGAPI png_get_io_state(png_const_structrp png_ptr)
Definition: juce_PNGLoader.cpp:1152
png_structrp png_const_color_16p background_color
Definition: juce_PNGLoader.cpp:1467
png_const_structrp png_const_inforp double double double double double double double * blue_X
Definition: juce_PNGLoader.cpp:2126
void PNGAPI png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr, int chunk, int location)
Definition: juce_PNGLoader.cpp:1212
png_uint_16 blue
Definition: png.h:587
void PNGAPI png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask)
Definition: juce_PNGLoader.cpp:1520
void PNGAPI png_set_gray_to_rgb(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:935
png_text ** png_textpp
Definition: juce_PNGLoader.cpp:675
png_byte * png_bytep
Definition: pngconf.h:572
void PNGAPI png_set_text_compression_mem_level(png_structrp png_ptr, int mem_level)
Definition: juce_PNGLoader.cpp:1391
png_const_structrp png_const_inforp double double double double double double double double double *blue_Z png_const_structrp png_const_inforp png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point *int_blue_Z png_set_cHRM_XYZ
Definition: juce_PNGLoader.cpp:2150
png_uint_16 gray
Definition: png.h:588
const png_sPLT_entry * png_const_sPLT_entryp
Definition: png.h:619
void PNGAPI png_set_bgr(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:21
void PNGAPI png_write_chunk(png_structrp png_ptr, png_const_bytep chunk_string, png_const_bytep data, png_size_t length)
Definition: juce_PNGLoader.cpp:193
png_get_cHRM_XYZ
Definition: juce_PNGLoader.cpp:2126
void PNGAPI png_process_data(png_structrp png_ptr, png_inforp info_ptr, png_bytep buffer, png_size_t buffer_size)
Definition: juce_PNGLoader.cpp:30
png_get_sCAL_fixed
Definition: juce_PNGLoader.cpp:2339
png_const_charp PNGAPI png_get_copyright(png_const_structrp png_ptr)
Definition: png.c:763
png_byte green
Definition: png.h:597
png_byte red
Definition: png.h:574
png_uint_32 PNGAPI png_get_y_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:331
png_uint_32 flags
Definition: png.h:2832
char * png_charp
Definition: pngconf.h:582
png_voidp PNGAPI png_get_error_ptr(png_const_structrp png_ptr)
Definition: juce_PNGLoader.cpp:825
void PNGAPI png_set_filter(png_structrp png_ptr, int method, int filters)
Definition: juce_PNGLoader.cpp:922
png_const_structrp png_const_inforp info_ptr
Definition: juce_PNGLoader.cpp:2126
png_struct * png_structp
Definition: png.h:535
png_byte ** png_bytepp
Definition: pngconf.h:599
Definition: pngstruct.h:144
#define PNG_RESTRICT
png_const_structrp png_const_inforp double double double double double double double double double *blue_Z png_const_structrp png_const_inforp png_fixed_point png_fixed_point png_fixed_point * int_red_Z
Definition: juce_PNGLoader.cpp:2136
Definition: png.h:2825
png_uint_32 warning_or_error
Definition: png.h:2858
png_uint_16 frequency
Definition: png.h:616
#define PNG_FP_EXPORT(ordinal, type, name, args)
png_uint_32 PNGAPI png_get_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, png_color_8p *sig_bit)
Definition: juce_PNGLoader.cpp:960
png_color ** png_colorpp
Definition: png.h:580
png_voidp PNGAPI png_get_io_ptr(png_const_structrp png_ptr)
Definition: png.c:640
void PNGAPI png_set_strip_16(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:184
png_uint_32 PNGAPI png_get_current_row_number(png_const_structrp png_ptr)
Definition: juce_PNGLoader.cpp:809
png_sPLT_t * png_sPLT_tp
Definition: png.h:634
void PNGAPI png_set_text_compression_strategy(png_structrp png_ptr, int strategy)
Definition: juce_PNGLoader.cpp:1402
void PNGAPI png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr, png_const_colorp palette, int num_palette)
Definition: juce_PNGLoader.cpp:511
void PNGAPI png_set_invert_mono(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:247
#define PNG_DEPRECATED
png_color_16 ** png_color_16pp
Definition: png.h:592
void PNGAPI png_set_unknown_chunks(png_const_structrp png_ptr, png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)
Definition: juce_PNGLoader.cpp:1116
png_const_structrp png_const_inforp double double * red_Y
Definition: juce_PNGLoader.cpp:2126
png_unknown_chunk ** png_unknown_chunkpp
Definition: juce_PNGLoader.cpp:733
png_set_filter_heuristics_fixed
Definition: juce_PNGLoader.cpp:1678
png_info ** png_infopp
Definition: png.h:550
void PNGAPI png_set_compression_level(png_structrp png_ptr, int level)
Definition: juce_PNGLoader.cpp:1295
png_size_t PNGAPI png_get_compression_buffer_size(png_const_structrp png_ptr)
Definition: juce_PNGLoader.cpp:1097
JCOPY_OPTION option
Definition: transupp.h:131
void PNGAPI png_free(png_const_structrp png_ptr, png_voidp ptr)
Definition: juce_PNGLoader.cpp:225
void PNGAPI png_read_update_info(png_structrp png_ptr, png_inforp info_ptr)
Definition: juce_PNGLoader.cpp:259
void PNGAPI png_save_uint_32(png_bytep buf, png_uint_32 i)
Definition: juce_PNGLoader.cpp:24
png_int_32(PNGAPI png_get_int_32)(png_const_bytep buf)
Definition: juce_PNGLoader.cpp:86
png_uint_16 blue
Definition: png.h:614
void PNGAPI png_set_rgb_to_gray(png_structrp png_ptr, int error_action, double red, double green)
Definition: juce_PNGLoader.cpp:1040
const png_color_8 * png_const_color_8p
Definition: png.h:603
#define png_benign_error
Definition: png.h:2007
void PNGAPI png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr, png_bytepp row_pointers)
Definition: juce_PNGLoader.cpp:1448
void PNGAPI png_set_error_fn(png_structrp png_ptr, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)
Definition: juce_PNGLoader.cpp:804
Definition: pnginfo.h:56
png_uint_32 PNGAPI png_get_user_height_max(png_const_structrp png_ptr)
Definition: juce_PNGLoader.cpp:1129
PNG_EXPORT(1, png_uint_32, png_access_version_number,(void))
png_uint_32 PNGAPI png_get_gAMA(png_const_structrp png_ptr, png_const_inforp info_ptr, double *file_gamma)
Definition: juce_PNGLoader.cpp:665
png_byte hour
Definition: png.h:699
const png_time * png_const_timep
Definition: png.h:704
void PNGAPI png_set_swap_alpha(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:220
void PNGAPI png_read_info(png_structrp png_ptr, png_inforp info_ptr)
Definition: juce_PNGLoader.cpp:92
int PNGAPI png_get_palette_max(png_const_structp png_ptr, png_const_infop info_ptr)
Definition: juce_PNGLoader.cpp:1167
png_size_t png_alloc_size_t
Definition: pngconf.h:550
const png_text * png_const_textp
Definition: juce_PNGLoader.cpp:674
void PNGAPI png_free_data(png_const_structrp png_ptr, png_inforp info_ptr, png_uint_32 mask, int num)
Definition: juce_PNGLoader.cpp:439
void PNGAPI png_set_text_compression_window_bits(png_structrp png_ptr, int window_bits)
Definition: juce_PNGLoader.cpp:1416
int PNGAPI png_get_sPLT(png_const_structrp png_ptr, png_inforp info_ptr, png_sPLT_tpp spalettes)
Definition: juce_PNGLoader.cpp:730
void PNGAPI png_init_io(png_structrp png_ptr, png_FILE_p fp)
Definition: juce_PNGLoader.cpp:657
void PNGAPI png_set_compression_mem_level(png_structrp png_ptr, int mem_level)
Definition: juce_PNGLoader.cpp:1306
png_voidp PNGAPI png_get_user_transform_ptr(png_const_structrp png_ptr)
Definition: juce_PNGLoader.cpp:798
png_unknown_chunk * png_unknown_chunkp
Definition: juce_PNGLoader.cpp:731
FILE * png_FILE_p
Definition: juce_PNGLoader.cpp:591
const png_unknown_chunk * png_const_unknown_chunkp
Definition: juce_PNGLoader.cpp:732
void PNGAPI png_set_text(png_const_structrp png_ptr, png_inforp info_ptr, png_const_textp text_ptr, int num_text)
Definition: juce_PNGLoader.cpp:692
png_uint_32 width
Definition: png.h:848
void PNGAPI png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size)
Definition: juce_PNGLoader.cpp:1467
void PNGAPI png_set_read_fn(png_structrp png_ptr, png_voidp io_ptr, png_rw_ptr read_data_fn)
Definition: juce_PNGLoader.cpp:87
png_size_t PNGAPI png_process_data_pause(png_structrp png_ptr, int save)
Definition: juce_PNGLoader.cpp:45
JOCTET * buffer
Definition: juce_JPEGLoader.cpp:302
struct png_color_8_struct png_color_8
png_const_structrp png_const_inforp double double double double double double double double double *blue_Z png_const_structrp png_const_inforp png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point *int_blue_Z png_const_structrp png_inforp double double double double double double double double double blue_Z png_const_structrp png_inforp png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point int_blue_Z png_const_structrp png_const_inforp png_fixed_point *int_file_gamma png_set_gAMA_fixed
Definition: juce_PNGLoader.cpp:2179
void PNGAPI png_set_gamma(png_structrp png_ptr, double scrn_gamma, double file_gamma)
Definition: juce_PNGLoader.cpp:838
void PNGAPI png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr, png_const_timep mod_time)
Definition: juce_PNGLoader.cpp:896
void PNGAPI png_set_benign_errors(png_structrp png_ptr, int allowed)
Definition: juce_PNGLoader.cpp:1565
png_byte second
Definition: png.h:701
png_color_8 * png_color_8p
Definition: png.h:602
const png_struct *PNG_RESTRICT png_const_structrp
Definition: png.h:564
png_uint_32 format
Definition: png.h:2831
void PNGAPI png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma)
Definition: juce_PNGLoader.cpp:152
png_const_structrp png_const_inforp double double double double double * green_Y
Definition: juce_PNGLoader.cpp:2126
png_byte color_type
Definition: png.h:850
void PNGAPI png_build_grayscale_palette(int bit_depth, png_colorp palette)
Definition: juce_PNGLoader.cpp:3470
png_const_charp PNGAPI png_convert_to_rfc1123(png_structrp png_ptr, png_const_timep ptime)
Definition: juce_PNGLoader.cpp:743
png_const_structrp png_const_inforp double double double double double double double double double *blue_Z png_const_structrp png_const_inforp png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point *int_blue_Z png_const_structrp png_inforp double double double double double double double double double blue_Z png_const_structrp png_inforp png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point int_blue_Z png_get_gAMA_fixed
Definition: juce_PNGLoader.cpp:2171
png_uint_16 green
Definition: png.h:586
void PNGAPI png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, png_const_color_8p sig_bit)
Definition: juce_PNGLoader.cpp:571
png_byte depth
Definition: png.h:630
png_uint_32 PNGAPI png_get_image_height(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:61
const png_info *PNG_RESTRICT png_const_inforp
Definition: png.h:566
png_byte channels
Definition: png.h:852
png_uint_32 PNGAPI png_get_user_width_max(png_const_structrp png_ptr)
Definition: juce_PNGLoader.cpp:1123
png_structrp int mode
Definition: juce_PNGLoader.cpp:1243
void PNGAPI png_set_swap(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:35
png_byte PNGAPI png_get_compression_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:106
void PNGAPI png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr, png_const_uint_16p hist)
Definition: juce_PNGLoader.cpp:162
void PNGAPI png_destroy_info_struct(png_const_structrp png_ptr, png_infopp info_ptr_ptr)
Definition: juce_PNGLoader.cpp:356
there are legal restrictions on arithmetic coding Invalid progressive parameters caller expects u Cannot quantize more than d color components Adobe APP14 flags
Definition: juce_JPEGLoader.cpp:127
png_uint_32 PNGAPI png_get_iCCP(png_const_structrp png_ptr, png_inforp info_ptr, png_charpp name, int *compression_type, png_bytepp profile, png_uint_32 *proflen)
Definition: juce_PNGLoader.cpp:704
png_structrp png_fixed_point screen_gamma
Definition: juce_PNGLoader.cpp:1517
void PNGAPI png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr, png_int_32 offset_x, png_int_32 offset_y, int unit_type)
Definition: juce_PNGLoader.cpp:255
png_alloc_size_t PNGAPI png_get_chunk_malloc_max(png_const_structrp png_ptr)
Definition: juce_PNGLoader.cpp:1143
png_uint_32 PNGAPI png_get_pHYs(png_const_structrp png_ptr, png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
Definition: juce_PNGLoader.cpp:907
struct png_image * png_imagep
void PNGAPI png_write_chunk_end(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:147
png_const_structrp png_const_inforp double double double double double double double double * blue_Y
Definition: juce_PNGLoader.cpp:2126
png_get_x_offset_inches_fixed
Definition: juce_PNGLoader.cpp:2564
png_const_charp PNGAPI png_get_header_version(png_const_structrp png_ptr)
Definition: png.c:809
void PNGAPI png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr, png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, png_const_charp units, png_charpp params)
Definition: juce_PNGLoader.cpp:272
png_byte minute
Definition: png.h:700
png_const_structrp png_const_inforp double double double double double double double double double *blue_Z png_const_structrp png_const_inforp png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point * int_green_Y
Definition: juce_PNGLoader.cpp:2136
void PNGAPI png_set_expand_16(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:922
Definition: png.h:627
const png_color * png_const_colorp
Definition: png.h:579
png_uint_32 version
Definition: png.h:2828
png_get_io_chunk_type
Definition: juce_PNGLoader.cpp:2590
struct png_sPLT_struct png_sPLT_t
PNG_EXPORTA(4, png_structp, png_create_read_struct,(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn), PNG_ALLOCATED)
float PNGAPI png_get_y_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:380
png_uint_32 PNGAPI png_get_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:319
#define png_chunk_benign_error
Definition: png.h:2008
void PNGAPI png_set_flush(png_structrp png_ptr, int nrows)
Definition: juce_PNGLoader.cpp:822
const png_byte * png_const_bytep
Definition: pngconf.h:573
png_int_32 PNGAPI png_get_x_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:254
void PNGAPI png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)
Definition: juce_PNGLoader.cpp:1433
void PNGAPI png_set_scale_16(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:170
#define png_chunk_warning(s1, s2)
Definition: pngpriv.h:289
void PNGAPI png_read_png(png_structrp png_ptr, png_inforp info_ptr, int transforms, voidp params)
Definition: juce_PNGLoader.cpp:935
png_structrp png_const_color_16p int background_gamma_code
Definition: juce_PNGLoader.cpp:1467
const png_uint_16 * png_const_uint_16p
Definition: pngconf.h:579
void PNGAPI png_set_compression_strategy(png_structrp png_ptr, int strategy)
Definition: juce_PNGLoader.cpp:1317
png_uint_32 PNGAPI png_get_hIST(png_const_structrp png_ptr, png_inforp info_ptr, png_uint_16p *hist)
Definition: juce_PNGLoader.cpp:745
png_row_info * png_row_infop
Definition: png.h:856
struct png_color_16_struct png_color_16
png_const_structrp png_const_inforp double double double double double double double double double *blue_Z png_const_structrp png_const_inforp png_fixed_point png_fixed_point png_fixed_point png_fixed_point * int_green_X
Definition: juce_PNGLoader.cpp:2136
png_uint_32 PNGAPI png_get_valid(png_const_structrp png_ptr, png_const_inforp info_ptr, png_uint_32 flag)
Definition: juce_PNGLoader.cpp:20
png_int_32 PNGAPI png_get_y_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:238
#define PNG_FIXED_EXPORT(ordinal, type, name, args)
png_uint_32 PNGAPI png_get_sCAL(png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, double *width, double *height)
Definition: juce_PNGLoader.cpp:873
void PNGAPI png_set_read_user_transform_fn(png_structrp png_ptr, png_user_transform_ptr read_user_transform_fn)
Definition: juce_PNGLoader.cpp:1054
png_uint_32 PNGAPI png_get_bKGD(png_const_structrp png_ptr, png_inforp info_ptr, png_color_16p *background)
Definition: juce_PNGLoader.cpp:457
int JSAMPARRAY int int num_rows
Definition: jpegint.h:373
png_sPLT_t ** png_sPLT_tpp
Definition: png.h:636
void PNGAPI png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
Definition: juce_PNGLoader.cpp:901
int val
Definition: jpeglib.h:956
void PNGAPI png_write_rows(png_structrp png_ptr, png_bytepp row, png_uint_32 num_rows)
Definition: juce_PNGLoader.cpp:559
char * png_libpng_version_1_6_1
Definition: png.h:525
png_uint_32 PNGAPI png_get_cHRM(png_const_structrp png_ptr, png_const_inforp info_ptr, double *white_x, double *white_y, double *red_x, double *red_y, double *green_x, double *green_y, double *blue_x, double *blue_y)
Definition: juce_PNGLoader.cpp:480
void PNGAPI png_write_row(png_structrp png_ptr, png_const_bytep row)
Definition: juce_PNGLoader.cpp:613
png_byte PNGAPI png_get_bit_depth(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:70
#define PNG_NORETURN
void PNGAPI png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr, png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)
Definition: juce_PNGLoader.cpp:921
const png_double * png_const_doublep
Definition: pngpriv.h:185
png_structrp int int png_const_fixed_point_p filter_weights
Definition: juce_PNGLoader.cpp:1678
char ** png_charpp
Definition: pngconf.h:605
png_byte pixel_depth
Definition: png.h:853
Definition: png.h:694
void PNGAPI png_set_user_limits(png_structrp png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)
Definition: juce_PNGLoader.cpp:1530
void PNGAPI png_set_compression_window_bits(png_structrp png_ptr, int window_bits)
Definition: juce_PNGLoader.cpp:1334
void PNGAPI png_set_expand_gray_1_2_4_to_8(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:894
void PNGAPI png_start_read_image(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:290
png_set_rgb_to_gray_fixed
Definition: juce_PNGLoader.cpp:1173
const void * png_const_voidp
Definition: pngconf.h:571
png_uint_32 length
Definition: juce_PNGLoader.cpp:2078
png_int_32 nentries
Definition: png.h:632
Definition: png.h:572
void PNGAPI png_set_write_status_fn(png_structrp png_ptr, png_write_status_ptr write_row_fn)
Definition: juce_PNGLoader.cpp:1453
void PNGAPI png_set_write_user_transform_fn(png_structrp png_ptr, png_user_transform_ptr write_user_transform_fn)
Definition: juce_PNGLoader.cpp:1463
png_uint_32 PNGAPI png_get_uint_31(png_const_structrp png_ptr, png_const_bytep buf)
Definition: juce_PNGLoader.cpp:24
png_struct *PNG_RESTRICT png_structrp
Definition: png.h:563
struct pnglibNamespace::png_text_struct png_text
png_const_charp PNGAPI png_get_libpng_ver(png_const_structrp png_ptr)
Definition: png.c:794
void PNGAPI png_set_chunk_malloc_max(png_structrp png_ptr, png_alloc_size_t user_chunk_malloc_max)
Definition: juce_PNGLoader.cpp:1554
png_sPLT_entry * png_sPLT_entryp
Definition: png.h:618
struct pnglibNamespace::png_unknown_chunk_t png_unknown_chunk
int PNGAPI png_handle_as_unknown(png_const_structrp png_ptr, png_const_bytep chunk_name)
Definition: juce_PNGLoader.cpp:826
void PNGAPI png_write_flush(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:834
void PNGAPI png_set_tRNS_to_alpha(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:906
png_const_structrp png_const_inforp int png_fixed_point * width
Definition: juce_PNGLoader.cpp:2339
void PNGAPI png_write_chunk_start(png_structrp png_ptr, png_const_bytep chunk_string, png_uint_32 length)
Definition: juce_PNGLoader.cpp:115
#define png_error(s1, s2)
int PNGAPI png_get_text(png_const_structrp png_ptr, png_inforp info_ptr, png_textp *text_ptr, int *num_text)
Definition: juce_PNGLoader.cpp:978
int PNGAPI png_sig_cmp(png_const_bytep sig, png_size_t start, png_size_t num_to_check)
Definition: juce_PNGLoader.cpp:49
#define png_get_int_32(buf)
Definition: png.h:2766
void PNGAPI png_set_invert_alpha(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:234
Definition: png.h:594
png_uint_16 red
Definition: png.h:612
png_const_structrp png_const_inforp info_ptr png_get_y_offset_inches_fixed
Definition: juce_PNGLoader.cpp:2571
const png_info * png_const_infop
Definition: png.h:549
void PNGAPI png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, int interlace_type, int compression_type, int filter_type)
Definition: juce_PNGLoader.cpp:205
png_structrp int int num_weights
Definition: juce_PNGLoader.cpp:1678
void PNGAPI png_set_palette_to_rgb(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:882
png_time * png_timep
Definition: png.h:703
png_uint_32 PNGAPI png_get_oFFs(png_const_structrp png_ptr, png_const_inforp info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
Definition: juce_PNGLoader.cpp:801
const png_color_16 * png_const_color_16p
Definition: png.h:591
void PNGAPI png_save_int_32(png_bytep buf, png_int_32 i)
Definition: juce_PNGLoader.cpp:676
png_size_t rowbytes
Definition: png.h:849
#define png_chunk_error(s1, s2)
png_structrp int error_action
Definition: juce_PNGLoader.cpp:1173
png_byte PNGAPI png_get_current_pass_number(png_const_structrp png_ptr)
Definition: juce_PNGLoader.cpp:821
void PNGAPI png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr, png_const_color_16p background)
Definition: juce_PNGLoader.cpp:25
png_byte index
Definition: png.h:584
png_uint_32 PNGAPI png_get_pCAL(png_const_structrp png_ptr, png_inforp info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams, png_charp *units, png_charpp *params)
Definition: juce_PNGLoader.cpp:821
png_uint_32 PNGAPI png_get_IHDR(png_const_structrp png_ptr, png_const_inforp info_ptr, png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type, int *interlace_type, int *compression_type, int *filter_type)
Definition: juce_PNGLoader.cpp:762
png_const_structrp png_const_inforp double double double double double double double double double *blue_Z png_const_structrp png_const_inforp png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point * int_green_Z
Definition: juce_PNGLoader.cpp:2136
png_const_structrp png_const_inforp double double double double * green_X
Definition: juce_PNGLoader.cpp:2126
png_byte day
Definition: png.h:698
void PNGAPI png_set_progressive_read_fn(png_structrp png_ptr, png_voidp progressive_ptr, png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn)
Definition: juce_PNGLoader.cpp:1269
int PNGAPI png_set_interlace_handling(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:97
png_uint_32 PNGAPI png_get_tIME(png_const_structrp png_ptr, png_inforp info_ptr, png_timep *mod_time)
Definition: juce_PNGLoader.cpp:1004
png_uint_16 * png_uint_16p
Definition: pngconf.h:578
void PNGAPI png_read_row(png_structrp png_ptr, png_bytep row, png_bytep dsp_row)
Definition: juce_PNGLoader.cpp:309
png_uint_32 PNGAPI png_get_x_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:115
png_uint_32 PNGAPI png_get_tRNS(png_const_structrp png_ptr, png_inforp info_ptr, png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
Definition: juce_PNGLoader.cpp:1022
png_color * png_colorp
Definition: png.h:578
void PNGAPI png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent)
Definition: juce_PNGLoader.cpp:586
void PNGAPI png_write_end(png_structrp png_ptr, png_inforp info_ptr)
Definition: juce_PNGLoader.cpp:345
png_row_info ** png_row_infopp
Definition: png.h:857
void PNGAPI png_set_quantize(png_structrp png_ptr, png_colorp palette, int num_palette, int maximum_colors, png_const_uint_16p histogram, int full_quantize)
Definition: juce_PNGLoader.cpp:410
void PNGAPI png_set_background(png_structrp png_ptr, png_const_color_16p background_color, int background_gamma_code, int need_expand, double background_gamma)
Definition: juce_PNGLoader.cpp:154
png_const_structrp png_const_inforp double double double double double double double double double *blue_Z png_const_structrp png_const_inforp png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point * int_blue_Y
Definition: juce_PNGLoader.cpp:2136
void PNGAPI png_write_image(png_structrp png_ptr, png_bytepp image)
Definition: juce_PNGLoader.cpp:581
struct png_control * png_controlp
Definition: png.h:2824
png_uint_32 PNGAPI png_get_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:151
png_uint_16 alpha
Definition: png.h:615
png_get_pixel_aspect_ratio_fixed
Definition: juce_PNGLoader.cpp:2090
void PNGAPI png_set_filler(png_structrp png_ptr, png_uint_32 filler, int filler_loc)
Definition: juce_PNGLoader.cpp:118
void PNGAPI png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit, double width, double height)
Definition: juce_PNGLoader.cpp:436
typedef PNG_CALLBACK(void,*png_error_ptr,(png_structp, png_const_charp))
png_const_structrp png_const_inforp double double double double double double * green_Z
Definition: juce_PNGLoader.cpp:2126
png_int_32 png_fixed_point
Definition: pngconf.h:567
png_uint_32 PNGAPI png_get_y_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:133
void PNGAPI png_set_sPLT(png_const_structrp png_ptr, png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)
Definition: juce_PNGLoader.cpp:981
void PNGAPI png_set_packswap(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:68
png_set_gamma_fixed
Definition: juce_PNGLoader.cpp:1517
png_uint_32 height
Definition: png.h:2830
png_byte month
Definition: png.h:697
size_t png_size_t
Definition: pngconf.h:515
png_uint_16 green
Definition: png.h:613
JSAMPIMAGE data
Definition: jpeglib.h:945
png_charp name
Definition: png.h:629
void PNGAPI png_set_text_compression_level(png_structrp png_ptr, int level)
Definition: juce_PNGLoader.cpp:1380
png_byte alpha
Definition: png.h:600
png_sPLT_entry ** png_sPLT_entrypp
Definition: png.h:620
png_voidp PNGAPI png_get_user_chunk_ptr(png_const_structrp png_ptr)
Definition: juce_PNGLoader.cpp:1090
void PNGAPI png_set_compression_method(png_structrp png_ptr, int method)
Definition: juce_PNGLoader.cpp:1361
png_uint_32
Definition: juce_PNGLoader.cpp:2126
png_uint_32 colormap_entries
Definition: png.h:2833
struct png_row_info_struct png_row_info
void PNGAPI png_set_user_transform_info(png_structrp png_ptr, png_voidp user_transform_ptr, int user_transform_depth, int user_transform_channels)
Definition: juce_PNGLoader.cpp:778
Definition: png.h:610
const png_struct * png_const_structp
Definition: png.h:534
png_const_structrp png_const_inforp double * red_X
Definition: juce_PNGLoader.cpp:2126
png_uint_16 red
Definition: png.h:585
png_uint_32 PNGAPI png_get_pHYs_dpi(png_const_structrp png_ptr, png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
Definition: juce_PNGLoader.cpp:391
png_const_structrp png_const_inforp double double double double double double double double double *blue_Z png_const_structrp png_const_inforp png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point * int_blue_X
Definition: juce_PNGLoader.cpp:2136
png_const_structrp png_const_inforp int * unit
Definition: juce_PNGLoader.cpp:2339
png_info *PNG_RESTRICT png_inforp
Definition: png.h:565
void PNGAPI png_set_keep_unknown_chunks(png_structrp png_ptr, int keep, png_const_bytep chunk_list, int num_chunks_in)
Definition: juce_PNGLoader.cpp:1282
void PNGAPI png_set_packing(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:50
void PNGAPI png_read_end(png_structrp png_ptr, png_inforp info_ptr)
Definition: juce_PNGLoader.cpp:688
void PNGAPI png_write_png(png_structrp png_ptr, png_inforp info_ptr, int transforms, voidp params)
Definition: juce_PNGLoader.cpp:1479
Definition: png.h:582
int PNGAPI png_convert_to_rfc1123_buffer(char out[29], png_const_timep ptime)
Definition: juce_PNGLoader.cpp:690
void PNGAPI png_set_strip_alpha(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:197
float PNGAPI png_get_pixel_aspect_ratio(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:169
png_color_16 * png_color_16p
Definition: png.h:590
void PNGAPI png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr, png_const_charp name, int compression_type, png_const_bytep profile, png_uint_32 proflen)
Definition: juce_PNGLoader.cpp:620
png_color_8 ** png_color_8pp
Definition: png.h:604
png_byte gray
Definition: png.h:599
png_uint_32 PNGAPI png_get_cHRM_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr, png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x, png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y, png_fixed_point *blue_x, png_fixed_point *blue_y)
Definition: juce_PNGLoader.cpp:609
png_const_structrp png_const_inforp double double double double double double double double double *blue_Z png_const_structrp png_const_inforp png_fixed_point * int_red_X
Definition: juce_PNGLoader.cpp:2136
void PNGAPI png_set_alpha_mode(png_structrp png_ptr, int mode, double output_gamma)
Definition: juce_PNGLoader.cpp:382
png_set_background_fixed
Definition: juce_PNGLoader.cpp:1467
png_sPLT_entryp entries
Definition: png.h:631
#define PNGARG(arglist)
png_byte PNGAPI png_get_filter_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:88
void PNGAPI png_set_shift(png_structrp png_ptr, png_const_color_8p true_bits)
Definition: juce_PNGLoader.cpp:82
png_uint_32 PNGAPI png_get_sRGB(png_const_structrp png_ptr, png_const_inforp info_ptr, int *file_srgb_intent)
Definition: juce_PNGLoader.cpp:686
void PNGAPI png_set_chunk_cache_max(png_structrp png_ptr, png_uint_32 user_chunk_cache_max)
Definition: juce_PNGLoader.cpp:1546
png_const_structrp png_const_inforp double double double double double double double double double *blue_Z png_get_cHRM_XYZ_fixed
Definition: juce_PNGLoader.cpp:2136
png_info * png_infop
Definition: png.h:548
png_uint_32 PNGAPI png_get_x_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:325
void PNGAPI png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)
Definition: juce_PNGLoader.cpp:495
png_byte PNGAPI png_get_color_type(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:79
png_uint_16 year
Definition: png.h:696
#define PNG_REMOVED(ordinal, type, name, args, attributes)
png_voidp PNGAPI png_get_progressive_ptr(png_const_structrp png_ptr)
Definition: juce_PNGLoader.cpp:1284
png_const_structrp png_const_inforp double double double double double double double double double *blue_Z png_const_structrp png_const_inforp png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point png_fixed_point *int_blue_Z png_const_structrp png_inforp double double double double double double double double double blue_Z png_set_cHRM_XYZ_fixed
Definition: juce_PNGLoader.cpp:2160
void PNGAPI png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr, int unit, png_const_charp swidth, png_const_charp sheight)
Definition: juce_PNGLoader.cpp:371
png_set_alpha_mode_fixed
Definition: juce_PNGLoader.cpp:1243
png_byte green
Definition: png.h:575
png_uint_32 PNGAPI png_get_PLTE(png_const_structrp png_ptr, png_inforp info_ptr, png_colorp *palette, int *num_palette)
Definition: juce_PNGLoader.cpp:941
png_byte bit_depth
Definition: png.h:851
png_text * png_textp
Definition: juce_PNGLoader.cpp:673
png_byte blue
Definition: png.h:576
png_int_32 PNGAPI png_get_x_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:222
png_uint_32 PNGAPI png_process_data_skip(png_structrp png_ptr)
Definition: juce_PNGLoader.cpp:72
struct png_color_struct png_color
void PNGAPI png_set_sig_bytes(png_structrp png_ptr, int num_bytes)
Definition: juce_PNGLoader.cpp:27
png_struct ** png_structpp
Definition: png.h:536
void PNGAPI png_write_info(png_structrp png_ptr, png_const_inforp info_ptr)
Definition: juce_PNGLoader.cpp:191
png_uint_32 PNGAPI png_access_version_number(void)
Definition: png.c:885
png_time ** png_timepp
Definition: png.h:705
const png_fixed_point * png_const_fixed_point_p
Definition: pngconf.h:585