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1/* pngpriv.h - private declarations for use inside libpng
2 *
3 * For conditions of distribution and use, see copyright notice in png.h
4 * Copyright (c) 1998-2013 Glenn Randers-Pehrson
5 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
6 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
7 *
8 * Last changed in libpng 1.6.2 [April 25, 2013]
9 *
10 * This code is released under the libpng license.
11 * For conditions of distribution and use, see the disclaimer
12 * and license in png.h
13 */
14
15/* The symbols declared in this file (including the functions declared
16 * as extern) are PRIVATE. They are not part of the libpng public
17 * interface, and are not recommended for use by regular applications.
18 * Some of them may become public in the future; others may stay private,
19 * change in an incompatible way, or even disappear.
20 * Although the libpng users are not forbidden to include this header,
21 * they should be well aware of the issues that may arise from doing so.
22 */
23
24#ifndef PNGPRIV_H
25#define PNGPRIV_H
26
27/* Feature Test Macros. The following are defined here to ensure that correctly
28 * implemented libraries reveal the APIs libpng needs to build and hide those
29 * that are not needed and potentially damaging to the compilation.
30 *
31 * Feature Test Macros must be defined before any system header is included (see
32 * POSIX 1003.1 2.8.2 "POSIX Symbols."
33 *
34 * These macros only have an effect if the operating system supports either
35 * POSIX 1003.1 or C99, or both. On other operating systems (particularly
36 * Windows/Visual Studio) there is no effect; the OS specific tests below are
37 * still required (as of 2011-05-02.)
38 */
39#define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
40
41#ifndef PNG_VERSION_INFO_ONLY
42/* Standard library headers not required by png.h: */
43# include <stdlib.h>
44# include <string.h>
45#endif
46
47#define PNGLIB_BUILD /*libpng is being built, not used*/
48
49/* If HAVE_CONFIG_H is defined during the build then the build system must
50 * provide an appropriate "config.h" file on the include path. The header file
51 * must provide definitions as required below (search for "HAVE_CONFIG_H");
52 * see configure.ac for more details of the requirements. The macro
53 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on
54 * 'configure'; define this macro to prevent the configure build including the
55 * configure generated config.h. Libpng is expected to compile without *any*
56 * special build system support on a reasonably ANSI-C compliant system.
57 */
58#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
59# include <config.h>
60
61 /* Pick up the definition of 'restrict' from config.h if it was read: */
62# define PNG_RESTRICT restrict
63#endif
64
65/* To support symbol prefixing it is necessary to know *before* including png.h
66 * whether the fixed point (and maybe other) APIs are exported, because if they
67 * are not internal definitions may be required. This is handled below just
68 * before png.h is included, but load the configuration now if it is available.
69 */
70#ifndef PNGLCONF_H
71# include "pnglibconf.h"
72#endif
73
74/* Local renames may change non-exported API functions from png.h */
75#if defined(PNG_PREFIX) && !defined(PNGPREFIX_H)
76# include "pngprefix.h"
77#endif
78
79#ifdef PNG_USER_CONFIG
80# include "pngusr.h"
81 /* These should have been defined in pngusr.h */
82# ifndef PNG_USER_PRIVATEBUILD
83# define PNG_USER_PRIVATEBUILD "Custom libpng build"
84# endif
85# ifndef PNG_USER_DLLFNAME_POSTFIX
86# define PNG_USER_DLLFNAME_POSTFIX "Cb"
87# endif
88#endif
89
90/* Is this a build of a DLL where compilation of the object modules requires
91 * different preprocessor settings to those required for a simple library? If
92 * so PNG_BUILD_DLL must be set.
93 *
94 * If libpng is used inside a DLL but that DLL does not export the libpng APIs
95 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
96 * static library of libpng then link the DLL against that.
97 */
98#ifndef PNG_BUILD_DLL
99# ifdef DLL_EXPORT
100 /* This is set by libtool when files are compiled for a DLL; libtool
101 * always compiles twice, even on systems where it isn't necessary. Set
102 * PNG_BUILD_DLL in case it is necessary:
103 */
104# define PNG_BUILD_DLL
105# else
106# ifdef _WINDLL
107 /* This is set by the Microsoft Visual Studio IDE in projects that
108 * build a DLL. It can't easily be removed from those projects (it
109 * isn't visible in the Visual Studio UI) so it is a fairly reliable
110 * indication that PNG_IMPEXP needs to be set to the DLL export
111 * attributes.
112 */
113# define PNG_BUILD_DLL
114# else
115# ifdef __DLL__
116 /* This is set by the Borland C system when compiling for a DLL
117 * (as above.)
118 */
119# define PNG_BUILD_DLL
120# else
121 /* Add additional compiler cases here. */
122# endif
123# endif
124# endif
125#endif /* Setting PNG_BUILD_DLL if required */
126
127/* See pngconf.h for more details: the builder of the library may set this on
128 * the command line to the right thing for the specific compilation system or it
129 * may be automagically set above (at present we know of no system where it does
130 * need to be set on the command line.)
131 *
132 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
133 * setting it to the "import" setting for a DLL build.
134 */
135#ifndef PNG_IMPEXP
136# ifdef PNG_BUILD_DLL
137# define PNG_IMPEXP PNG_DLL_EXPORT
138# else
139 /* Not building a DLL, or the DLL doesn't require specific export
140 * definitions.
141 */
142# define PNG_IMPEXP
143# endif
144#endif
145
146/* No warnings for private or deprecated functions in the build: */
147#ifndef PNG_DEPRECATED
148# define PNG_DEPRECATED
149#endif
150#ifndef PNG_PRIVATE
151# define PNG_PRIVATE
152#endif
153
154/* Symbol preprocessing support.
155 *
156 * To enable listing global, but internal, symbols the following macros should
157 * always be used to declare an extern data or function object in this file.
158 */
159#ifndef PNG_INTERNAL_DATA
160# define PNG_INTERNAL_DATA(type, name, array) extern type name array
161#endif
162
163#ifndef PNG_INTERNAL_FUNCTION
164# define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
165 extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
166#endif
167
168/* If floating or fixed point APIs are disabled they may still be compiled
169 * internally. To handle this make sure they are declared as the appropriate
170 * internal extern function (otherwise the symbol prefixing stuff won't work and
171 * the functions will be used without definitions.)
172 *
173 * NOTE: although all the API functions are declared here they are not all
174 * actually built! Because the declarations are still made it is necessary to
175 * fake out types that they depend on.
176 */
177#ifndef PNG_FP_EXPORT
178# ifndef PNG_FLOATING_POINT_SUPPORTED
179# define PNG_FP_EXPORT(ordinal, type, name, args)\
180 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
181# ifndef PNG_VERSION_INFO_ONLY
182 typedef struct png_incomplete png_double;
183 typedef png_double* png_doublep;
184 typedef const png_double* png_const_doublep;
185 typedef png_double** png_doublepp;
186# endif
187# endif
188#endif
189#ifndef PNG_FIXED_EXPORT
190# ifndef PNG_FIXED_POINT_SUPPORTED
191# define PNG_FIXED_EXPORT(ordinal, type, name, args)\
192 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
193# endif
194#endif
195
196#include "png.h"
197
198/* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
199#ifndef PNG_DLL_EXPORT
200# define PNG_DLL_EXPORT
201#endif
202
203/* SECURITY and SAFETY:
204 *
205 * By default libpng is built without any internal limits on image size,
206 * individual heap (png_malloc) allocations or the total amount of memory used.
207 * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used
208 * (unless individually overridden). These limits are believed to be fairly
209 * safe, but builders of secure systems should verify the values against the
210 * real system capabilities.
211 */
212#ifdef PNG_SAFE_LIMITS_SUPPORTED
213 /* 'safe' limits */
214# ifndef PNG_USER_WIDTH_MAX
215# define PNG_USER_WIDTH_MAX 1000000
216# endif
217# ifndef PNG_USER_HEIGHT_MAX
218# define PNG_USER_HEIGHT_MAX 1000000
219# endif
220# ifndef PNG_USER_CHUNK_CACHE_MAX
221# define PNG_USER_CHUNK_CACHE_MAX 128
222# endif
223# ifndef PNG_USER_CHUNK_MALLOC_MAX
224# define PNG_USER_CHUNK_MALLOC_MAX 8000000
225# endif
226#else
227 /* values for no limits */
228# ifndef PNG_USER_WIDTH_MAX
229# define PNG_USER_WIDTH_MAX 0x7fffffff
230# endif
231# ifndef PNG_USER_HEIGHT_MAX
232# define PNG_USER_HEIGHT_MAX 0x7fffffff
233# endif
234# ifndef PNG_USER_CHUNK_CACHE_MAX
235# define PNG_USER_CHUNK_CACHE_MAX 0
236# endif
237# ifndef PNG_USER_CHUNK_MALLOC_MAX
238# define PNG_USER_CHUNK_MALLOC_MAX 0
239# endif
240#endif
241
242/* Moved to pngpriv.h at libpng-1.5.0 */
243/* NOTE: some of these may have been used in external applications as
244 * these definitions were exposed in pngconf.h prior to 1.5.
245 */
246
247/* If you are running on a machine where you cannot allocate more
248 * than 64K of memory at once, uncomment this. While libpng will not
249 * normally need that much memory in a chunk (unless you load up a very
250 * large file), zlib needs to know how big of a chunk it can use, and
251 * libpng thus makes sure to check any memory allocation to verify it
252 * will fit into memory.
253 *
254 * zlib provides 'MAXSEG_64K' which, if defined, indicates the
255 * same limit and pngconf.h (already included) sets the limit
256 * if certain operating systems are detected.
257 */
258#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
259# define PNG_MAX_MALLOC_64K
260#endif
261
262#ifndef PNG_UNUSED
263/* Unused formal parameter warnings are silenced using the following macro
264 * which is expected to have no bad effects on performance (optimizing
265 * compilers will probably remove it entirely). Note that if you replace
266 * it with something other than whitespace, you must include the terminating
267 * semicolon.
268 */
269# define PNG_UNUSED(param) (void)param;
270#endif
271
272/* Just a little check that someone hasn't tried to define something
273 * contradictory.
274 */
275#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
276# undef PNG_ZBUF_SIZE
277# define PNG_ZBUF_SIZE 65536L
278#endif
279
280/* If warnings or errors are turned off the code is disabled or redirected here.
281 * From 1.5.4 functions have been added to allow very limited formatting of
282 * error and warning messages - this code will also be disabled here.
283 */
284#ifdef PNG_WARNINGS_SUPPORTED
285# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
286#else
287# define png_warning(s1,s2) ((void)(s1))
288# define png_chunk_warning(s1,s2) ((void)(s1))
289# define png_warning_parameter(p,number,string) ((void)0)
290# define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
291# define png_warning_parameter_signed(p,number,format,value) ((void)0)
292# define png_formatted_warning(pp,p,message) ((void)(pp))
293# define PNG_WARNING_PARAMETERS(p)
294#endif
295#ifndef PNG_ERROR_TEXT_SUPPORTED
296# define png_error(s1,s2) png_err(s1)
297# define png_chunk_error(s1,s2) png_err(s1)
298# define png_fixed_error(s1,s2) png_err(s1)
299#endif
300
301/* C allows up-casts from (void*) to any pointer and (const void*) to any
302 * pointer to a const object. C++ regards this as a type error and requires an
303 * explicit, static, cast and provides the static_cast<> rune to ensure that
304 * const is not cast away.
305 */
306#ifdef __cplusplus
307# define png_voidcast(type, value) static_cast<type>(value)
308# define png_constcast(type, value) const_cast<type>(value)
309# define png_aligncast(type, value) \
310 static_cast<type>(static_cast<void*>(value))
311# define png_aligncastconst(type, value) \
312 static_cast<type>(static_cast<const void*>(value))
313#else
314# define png_voidcast(type, value) (value)
315# define png_constcast(type, value) ((type)(value))
316# define png_aligncast(type, value) ((void*)(value))
317# define png_aligncastconst(type, value) ((const void*)(value))
318#endif /* __cplusplus */
319
320/* Some fixed point APIs are still required even if not exported because
321 * they get used by the corresponding floating point APIs. This magic
322 * deals with this:
323 */
324#ifdef PNG_FIXED_POINT_SUPPORTED
325# define PNGFAPI PNGAPI
326#else
327# define PNGFAPI /* PRIVATE */
328#endif
329
330#ifndef PNG_VERSION_INFO_ONLY
331/* Other defines specific to compilers can go here. Try to keep
332 * them inside an appropriate ifdef/endif pair for portability.
333 */
334#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
335 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
336 /* png.c requires the following ANSI-C constants if the conversion of
337 * floating point to ASCII is implemented therein:
338 *
339 * DBL_DIG Maximum number of decimal digits (can be set to any constant)
340 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
341 * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
342 */
343# include <float.h>
344
345# if ( ( (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
346 defined(THINK_C) || defined(TARGET_OS_MAC) ) && !wxOSX_USE_IPHONE ) || defined(__SC__)
347 /* We need to check that <math.h> hasn't already been included earlier
348 * as it seems it doesn't agree with <fp.h>, yet we should really use
349 * <fp.h> if possible.
350 */
351# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
352# include <fp.h>
353# endif
354# else
355# include <math.h>
356# endif
357# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
358 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
359 * MATH=68881
360 */
361# include <m68881.h>
362# endif
363#endif
364
365/* This provides the non-ANSI (far) memory allocation routines. */
366#if defined(__TURBOC__) && defined(__MSDOS__)
367# include <mem.h>
368# include <alloc.h>
369#endif
370
371#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
372 defined(_WIN32) || defined(__WIN32__)
373# include <windows.h> /* defines _WINDOWS_ macro */
374#endif
375#endif /* PNG_VERSION_INFO_ONLY */
376
377/* Moved here around 1.5.0beta36 from pngconf.h */
378/* Users may want to use these so they are not private. Any library
379 * functions that are passed far data must be model-independent.
380 */
381
382/* Memory model/platform independent fns */
383#ifndef PNG_ABORT
384# ifdef _WINDOWS_
385# define PNG_ABORT() ExitProcess(0)
386# else
387# define PNG_ABORT() abort()
388# endif
389#endif
390
391/* These macros may need to be architecture dependent. */
392#define PNG_ALIGN_NONE 0 /* do not use data alignment */
393#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
394#ifdef offsetof
395# define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
396#else
397# define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
398#endif
399#define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
400
401#ifndef PNG_ALIGN_TYPE
402 /* Default to using aligned access optimizations and requiring alignment to a
403 * multiple of the data type size. Override in a compiler specific fashion
404 * if necessary by inserting tests here:
405 */
406# define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
407#endif
408
409#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
410 /* This is used because in some compiler implementations non-aligned
411 * structure members are supported, so the offsetof approach below fails.
412 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
413 * is good for performance. Do not do this unless you have tested the result
414 * and understand it.
415 */
416# define png_alignof(type) (sizeof (type))
417#else
418# if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
419# define png_alignof(type) offsetof(struct{char c; type t;}, t)
420# else
421# if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
422# define png_alignof(type) (1)
423# endif
424 /* Else leave png_alignof undefined to prevent use thereof */
425# endif
426#endif
427
428/* This implicitly assumes alignment is always to a power of 2. */
429#ifdef png_alignof
430# define png_isaligned(ptr, type)\
431 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0)
432#else
433# define png_isaligned(ptr, type) 0
434#endif
435
436/* End of memory model/platform independent support */
437/* End of 1.5.0beta36 move from pngconf.h */
438
439/* CONSTANTS and UTILITY MACROS
440 * These are used internally by libpng and not exposed in the API
441 */
442
443/* Various modes of operation. Note that after an init, mode is set to
444 * zero automatically when the structure is created. Three of these
445 * are defined in png.h because they need to be visible to applications
446 * that call png_set_unknown_chunk().
447 */
448/* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */
449/* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */
450#define PNG_HAVE_IDAT 0x04
451/* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */
452#define PNG_HAVE_IEND 0x10
453 /* 0x20 (unused) */
454 /* 0x40 (unused) */
455 /* 0x80 (unused) */
456#define PNG_HAVE_CHUNK_HEADER 0x100
457#define PNG_WROTE_tIME 0x200
458#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
459#define PNG_BACKGROUND_IS_GRAY 0x800
460#define PNG_HAVE_PNG_SIGNATURE 0x1000
461#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
462 /* 0x4000 (unused) */
463#define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */
464
465/* Flags for the transformations the PNG library does on the image data */
466#define PNG_BGR 0x0001
467#define PNG_INTERLACE 0x0002
468#define PNG_PACK 0x0004
469#define PNG_SHIFT 0x0008
470#define PNG_SWAP_BYTES 0x0010
471#define PNG_INVERT_MONO 0x0020
472#define PNG_QUANTIZE 0x0040
473#define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */
474#define PNG_BACKGROUND_EXPAND 0x0100
475#define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */
476#define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */
477#define PNG_RGBA 0x0800
478#define PNG_EXPAND 0x1000
479#define PNG_GAMMA 0x2000
480#define PNG_GRAY_TO_RGB 0x4000
481#define PNG_FILLER 0x8000
482#define PNG_PACKSWAP 0x10000
483#define PNG_SWAP_ALPHA 0x20000
484#define PNG_STRIP_ALPHA 0x40000
485#define PNG_INVERT_ALPHA 0x80000
486#define PNG_USER_TRANSFORM 0x100000
487#define PNG_RGB_TO_GRAY_ERR 0x200000
488#define PNG_RGB_TO_GRAY_WARN 0x400000
489#define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */
490#define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */
491#define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */
492#define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */
493#define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */
494 /* 0x8000000 unused */
495 /* 0x10000000 unused */
496 /* 0x20000000 unused */
497 /* 0x40000000 unused */
498/* Flags for png_create_struct */
499#define PNG_STRUCT_PNG 0x0001
500#define PNG_STRUCT_INFO 0x0002
501
502/* Scaling factor for filter heuristic weighting calculations */
503#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
504#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
505
506/* Flags for the png_ptr->flags rather than declaring a byte for each one */
507#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
508#define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */
509 /* 0x0004 unused */
510#define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */
511 /* 0x0010 unused */
512 /* 0x0020 unused */
513#define PNG_FLAG_ROW_INIT 0x0040
514#define PNG_FLAG_FILLER_AFTER 0x0080
515#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
516#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
517#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
518#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
519#define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */
520#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */
521#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */
522/* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */
523/* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */
524#define PNG_FLAG_LIBRARY_MISMATCH 0x20000
525#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000
526#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000
527#define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */
528#define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */
529#define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */
530 /* 0x800000 unused */
531 /* 0x1000000 unused */
532 /* 0x2000000 unused */
533 /* 0x4000000 unused */
534 /* 0x8000000 unused */
535 /* 0x10000000 unused */
536 /* 0x20000000 unused */
537 /* 0x40000000 unused */
538
539#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
540 PNG_FLAG_CRC_ANCILLARY_NOWARN)
541
542#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
543 PNG_FLAG_CRC_CRITICAL_IGNORE)
544
545#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
546 PNG_FLAG_CRC_CRITICAL_MASK)
547
548/* Save typing and make code easier to understand */
549
550#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
551 abs((int)((c1).green) - (int)((c2).green)) + \
552 abs((int)((c1).blue) - (int)((c2).blue)))
553
554/* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
555 * by dividing by 257 *with rounding*. This macro is exact for the given range.
556 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
557 * macro were established by experiment (modifying the added value). The macro
558 * has a second variant that takes a value already scaled by 255 and divides by
559 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
560 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
561 */
562#define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
563#define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
564
565/* Added to libpng-1.2.6 JB */
566#define PNG_ROWBYTES(pixel_bits, width) \
567 ((pixel_bits) >= 8 ? \
568 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
569 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
570
571/* PNG_OUT_OF_RANGE returns true if value is outside the range
572 * ideal-delta..ideal+delta. Each argument is evaluated twice.
573 * "ideal" and "delta" should be constants, normally simple
574 * integers, "value" a variable. Added to libpng-1.2.6 JB
575 */
576#define PNG_OUT_OF_RANGE(value, ideal, delta) \
577 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
578
579/* Conversions between fixed and floating point, only defined if
580 * required (to make sure the code doesn't accidentally use float
581 * when it is supposedly disabled.)
582 */
583#ifdef PNG_FLOATING_POINT_SUPPORTED
584/* The floating point conversion can't overflow, though it can and
585 * does lose accuracy relative to the original fixed point value.
586 * In practice this doesn't matter because png_fixed_point only
587 * stores numbers with very low precision. The png_ptr and s
588 * arguments are unused by default but are there in case error
589 * checking becomes a requirement.
590 */
591#define png_float(png_ptr, fixed, s) (.00001 * (fixed))
592
593/* The fixed point conversion performs range checking and evaluates
594 * its argument multiple times, so must be used with care. The
595 * range checking uses the PNG specification values for a signed
596 * 32 bit fixed point value except that the values are deliberately
597 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
598 * (2^31-1) * 100000). 's' is a string that describes the value being
599 * converted.
600 *
601 * NOTE: this macro will raise a png_error if the range check fails,
602 * therefore it is normally only appropriate to use this on values
603 * that come from API calls or other sources where an out of range
604 * error indicates a programming error, not a data error!
605 *
606 * NOTE: by default this is off - the macro is not used - because the
607 * function call saves a lot of code.
608 */
609#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
610#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
611 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
612#endif
613/* else the corresponding function is defined below, inside the scope of the
614 * cplusplus test.
615 */
616#endif
617
618/* Constants for known chunk types. If you need to add a chunk, define the name
619 * here. For historical reasons these constants have the form png_<name>; i.e.
620 * the prefix is lower case. Please use decimal values as the parameters to
621 * match the ISO PNG specification and to avoid relying on the C locale
622 * interpretation of character values.
623 *
624 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
625 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
626 * to be generated if required.
627 *
628 * PNG_32b correctly produces a value shifted by up to 24 bits, even on
629 * architectures where (int) is only 16 bits.
630 */
631#define PNG_32b(b,s) ((png_uint_32)(b) << (s))
632#define PNG_CHUNK(b1,b2,b3,b4) \
633 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
634
635#define png_IHDR PNG_CHUNK( 73, 72, 68, 82)
636#define png_IDAT PNG_CHUNK( 73, 68, 65, 84)
637#define png_IEND PNG_CHUNK( 73, 69, 78, 68)
638#define png_PLTE PNG_CHUNK( 80, 76, 84, 69)
639#define png_bKGD PNG_CHUNK( 98, 75, 71, 68)
640#define png_cHRM PNG_CHUNK( 99, 72, 82, 77)
641#define png_gAMA PNG_CHUNK(103, 65, 77, 65)
642#define png_hIST PNG_CHUNK(104, 73, 83, 84)
643#define png_iCCP PNG_CHUNK(105, 67, 67, 80)
644#define png_iTXt PNG_CHUNK(105, 84, 88, 116)
645#define png_oFFs PNG_CHUNK(111, 70, 70, 115)
646#define png_pCAL PNG_CHUNK(112, 67, 65, 76)
647#define png_sCAL PNG_CHUNK(115, 67, 65, 76)
648#define png_pHYs PNG_CHUNK(112, 72, 89, 115)
649#define png_sBIT PNG_CHUNK(115, 66, 73, 84)
650#define png_sPLT PNG_CHUNK(115, 80, 76, 84)
651#define png_sRGB PNG_CHUNK(115, 82, 71, 66)
652#define png_sTER PNG_CHUNK(115, 84, 69, 82)
653#define png_tEXt PNG_CHUNK(116, 69, 88, 116)
654#define png_tIME PNG_CHUNK(116, 73, 77, 69)
655#define png_tRNS PNG_CHUNK(116, 82, 78, 83)
656#define png_zTXt PNG_CHUNK(122, 84, 88, 116)
657
658/* The following will work on (signed char*) strings, whereas the get_uint_32
659 * macro will fail on top-bit-set values because of the sign extension.
660 */
661#define PNG_CHUNK_FROM_STRING(s)\
662 PNG_CHUNK(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3])
663
664/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
665 * signed and the argument is a (char[]) This macro will fail miserably on
666 * systems where (char) is more than 8 bits.
667 */
668#define PNG_STRING_FROM_CHUNK(s,c)\
669 (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\
670 ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c)))
671
672/* Do the same but terminate with a null character. */
673#define PNG_CSTRING_FROM_CHUNK(s,c)\
674 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
675
676/* Test on flag values as defined in the spec (section 5.4): */
677#define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))
678#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))
679#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
680#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
681#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
682
683/* Gamma values (new at libpng-1.5.4): */
684#define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
685#define PNG_GAMMA_MAC_INVERSE 65909
686#define PNG_GAMMA_sRGB_INVERSE 45455
687
688/* Almost everything below is C specific; the #defines above can be used in
689 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
690 */
691#ifndef PNG_VERSION_INFO_ONLY
692
693#include "pngstruct.h"
694#include "pnginfo.h"
695
696/* This is used for 16 bit gamma tables -- only the top level pointers are
697 * const; this could be changed:
698 */
699typedef const png_uint_16p * png_const_uint_16pp;
700
701/* Added to libpng-1.5.7: sRGB conversion tables */
702#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
703 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
704#ifdef PNG_SIMPLIFIED_READ_SUPPORTED
705PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
706 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
707 * 0..65535. This table gives the closest 16-bit answers (no errors).
708 */
709#endif
710
711PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
712PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
713
714#define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\
715 ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))
716 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
717 * encoded value with maximum error 0.646365. Note that the input is not a
718 * 16-bit value; it has been multiplied by 255! */
719#endif /* PNG_SIMPLIFIED_READ/WRITE */
720
721
722/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
723#ifdef __cplusplus
724extern "C" {
725#endif /* __cplusplus */
726
727/* Internal functions; these are not exported from a DLL however because they
728 * are used within several of the C source files they have to be C extern.
729 *
730 * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
731 */
732
733/* Zlib support */
734#define PNG_UNEXPECTED_ZLIB_RETURN (-7)
735PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
736 PNG_EMPTY);
737 /* Used by the zlib handling functions to ensure that z_stream::msg is always
738 * set before they return.
739 */
740
741#ifdef PNG_WRITE_SUPPORTED
742PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
743 png_compression_bufferp *list),PNG_EMPTY);
744 /* Free the buffer list used by the compressed write code. */
745#endif
746
747#if defined(PNG_FLOATING_POINT_SUPPORTED) && \
748 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
749 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
750 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
751 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
752 (defined(PNG_sCAL_SUPPORTED) && \
753 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
754PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
755 double fp, png_const_charp text),PNG_EMPTY);
756#endif
757
758/* Check the user version string for compatibility, returns false if the version
759 * numbers aren't compatible.
760 */
761PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
762 png_const_charp user_png_ver),PNG_EMPTY);
763
764/* Internal base allocator - no messages, NULL on failure to allocate. This
765 * does, however, call the application provided allocator and that could call
766 * png_error (although that would be a bug in the application implementation.)
767 */
768PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
769 png_alloc_size_t size),PNG_ALLOCATED);
770
771#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
772 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
773/* Internal array allocator, outputs no error or warning messages on failure,
774 * just returns NULL.
775 */
776PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,
777 int nelements, size_t element_size),PNG_ALLOCATED);
778
779/* The same but an existing array is extended by add_elements. This function
780 * also memsets the new elements to 0 and copies the old elements. The old
781 * array is not freed or altered.
782 */
783PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,
784 png_const_voidp array, int old_elements, int add_elements,
785 size_t element_size),PNG_ALLOCATED);
786#endif /* text, sPLT or unknown chunks */
787
788/* Magic to create a struct when there is no struct to call the user supplied
789 * memory allocators. Because error handling has not been set up the memory
790 * handlers can't safely call png_error, but this is an obscure and undocumented
791 * restriction so libpng has to assume that the 'free' handler, at least, might
792 * call png_error.
793 */
794PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
795 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
796 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
797 png_free_ptr free_fn),PNG_ALLOCATED);
798
799/* Free memory from internal libpng struct */
800PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
801 PNG_EMPTY);
802
803/* Free an allocated jmp_buf (always succeeds) */
804PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
805
806/* Function to allocate memory for zlib. PNGAPI is disallowed. */
807PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
808 PNG_ALLOCATED);
809
810/* Function to free memory for zlib. PNGAPI is disallowed. */
811PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
812
813/* Next four functions are used internally as callbacks. PNGCBAPI is required
814 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
815 * PNGCBAPI at 1.5.0
816 */
817
818PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
819 png_bytep data, png_size_t length),PNG_EMPTY);
820
821#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
822PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
823 png_bytep buffer, png_size_t length),PNG_EMPTY);
824#endif
825
826PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
827 png_bytep data, png_size_t length),PNG_EMPTY);
828
829#ifdef PNG_WRITE_FLUSH_SUPPORTED
830# ifdef PNG_STDIO_SUPPORTED
831PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
832 PNG_EMPTY);
833# endif
834#endif
835
836/* Reset the CRC variable */
837PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
838
839/* Write the "data" buffer to whatever output you are using */
840PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
841 png_const_bytep data, png_size_t length),PNG_EMPTY);
842
843/* Read and check the PNG file signature */
844PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
845 png_inforp info_ptr),PNG_EMPTY);
846
847/* Read the chunk header (length + type name) */
848PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
849 PNG_EMPTY);
850
851/* Read data from whatever input you are using into the "data" buffer */
852PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
853 png_size_t length),PNG_EMPTY);
854
855/* Read bytes into buf, and update png_ptr->crc */
856PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
857 png_uint_32 length),PNG_EMPTY);
858
859/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
860PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
861 png_uint_32 skip),PNG_EMPTY);
862
863/* Read the CRC from the file and compare it to the libpng calculated CRC */
864PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
865
866/* Calculate the CRC over a section of data. Note that we are only
867 * passing a maximum of 64K on systems that have this as a memory limit,
868 * since this is the maximum buffer size we can specify.
869 */
870PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
871 png_const_bytep ptr, png_size_t length),PNG_EMPTY);
872
873#ifdef PNG_WRITE_FLUSH_SUPPORTED
874PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
875#endif
876
877/* Write various chunks */
878
879/* Write the IHDR chunk, and update the png_struct with the necessary
880 * information.
881 */
882PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
883 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
884 int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
885
886PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
887 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
888
889PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
890 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
891 PNG_EMPTY);
892
893PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
894
895#ifdef PNG_WRITE_gAMA_SUPPORTED
896PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
897 png_fixed_point file_gamma),PNG_EMPTY);
898#endif
899
900#ifdef PNG_WRITE_sBIT_SUPPORTED
901PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
902 png_const_color_8p sbit, int color_type),PNG_EMPTY);
903#endif
904
905#ifdef PNG_WRITE_cHRM_SUPPORTED
906PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
907 const png_xy *xy), PNG_EMPTY);
908 /* The xy value must have been previously validated */
909#endif
910
911#ifdef PNG_WRITE_sRGB_SUPPORTED
912PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
913 int intent),PNG_EMPTY);
914#endif
915
916#ifdef PNG_WRITE_iCCP_SUPPORTED
917PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
918 png_const_charp name, png_const_bytep profile), PNG_EMPTY);
919 /* The profile must have been previously validated for correctness, the
920 * length comes from the first four bytes. Only the base, deflate,
921 * compression is supported.
922 */
923#endif
924
925#ifdef PNG_WRITE_sPLT_SUPPORTED
926PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
927 png_const_sPLT_tp palette),PNG_EMPTY);
928#endif
929
930#ifdef PNG_WRITE_tRNS_SUPPORTED
931PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
932 png_const_bytep trans, png_const_color_16p values, int number,
933 int color_type),PNG_EMPTY);
934#endif
935
936#ifdef PNG_WRITE_bKGD_SUPPORTED
937PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
938 png_const_color_16p values, int color_type),PNG_EMPTY);
939#endif
940
941#ifdef PNG_WRITE_hIST_SUPPORTED
942PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
943 png_const_uint_16p hist, int num_hist),PNG_EMPTY);
944#endif
945
946/* Chunks that have keywords */
947#ifdef PNG_WRITE_tEXt_SUPPORTED
948PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
949 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY);
950#endif
951
952#ifdef PNG_WRITE_zTXt_SUPPORTED
953PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp
954 key, png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY);
955#endif
956
957#ifdef PNG_WRITE_iTXt_SUPPORTED
958PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
959 int compression, png_const_charp key, png_const_charp lang,
960 png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
961#endif
962
963#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
964PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,
965 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
966#endif
967
968#ifdef PNG_WRITE_oFFs_SUPPORTED
969PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
970 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
971#endif
972
973#ifdef PNG_WRITE_pCAL_SUPPORTED
974PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
975 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
976 png_const_charp units, png_charpp params),PNG_EMPTY);
977#endif
978
979#ifdef PNG_WRITE_pHYs_SUPPORTED
980PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
981 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
982 int unit_type),PNG_EMPTY);
983#endif
984
985#ifdef PNG_WRITE_tIME_SUPPORTED
986PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
987 png_const_timep mod_time),PNG_EMPTY);
988#endif
989
990#ifdef PNG_WRITE_sCAL_SUPPORTED
991PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
992 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
993#endif
994
995/* Called when finished processing a row of data */
996PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),
997 PNG_EMPTY);
998
999/* Internal use only. Called before first row of data */
1000PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),
1001 PNG_EMPTY);
1002
1003/* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
1004 * array of png_ptr->width pixels. If the image is not interlaced or this
1005 * is the final pass this just does a memcpy, otherwise the "display" flag
1006 * is used to determine whether to copy pixels that are not in the current pass.
1007 *
1008 * Because 'png_do_read_interlace' (below) replicates pixels this allows this
1009 * function to achieve the documented 'blocky' appearance during interlaced read
1010 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
1011 * are not changed if they are not in the current pass, when display is 0.
1012 *
1013 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
1014 *
1015 * The API always reads from the png_struct row buffer and always assumes that
1016 * it is full width (png_do_read_interlace has already been called.)
1017 *
1018 * This function is only ever used to write to row buffers provided by the
1019 * caller of the relevant libpng API and the row must have already been
1020 * transformed by the read transformations.
1021 *
1022 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
1023 * bitmasks for use within the code, otherwise runtime generated masks are used.
1024 * The default is compile time masks.
1025 */
1026#ifndef PNG_USE_COMPILE_TIME_MASKS
1027# define PNG_USE_COMPILE_TIME_MASKS 1
1028#endif
1029PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
1030 png_bytep row, int display),PNG_EMPTY);
1031
1032#ifdef PNG_READ_INTERLACING_SUPPORTED
1033/* Expand an interlaced row: the 'row_info' describes the pass data that has
1034 * been read in and must correspond to the pixels in 'row', the pixels are
1035 * expanded (moved apart) in 'row' to match the final layout, when doing this
1036 * the pixels are *replicated* to the intervening space. This is essential for
1037 * the correct operation of png_combine_row, above.
1038 */
1039PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
1040 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
1041#endif
1042
1043/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
1044
1045#ifdef PNG_WRITE_INTERLACING_SUPPORTED
1046/* Grab pixels out of a row for an interlaced pass */
1047PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
1048 png_bytep row, int pass),PNG_EMPTY);
1049#endif
1050
1051/* Unfilter a row: check the filter value before calling this, there is no point
1052 * calling it for PNG_FILTER_VALUE_NONE.
1053 */
1054PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
1055 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
1056
1057PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
1058 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1059PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop
1060 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1061PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop
1062 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1063PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop
1064 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1065PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
1066 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1067PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop
1068 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1069PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop
1070 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1071
1072/* Choose the best filter to use and filter the row data */
1073PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
1074 png_row_infop row_info),PNG_EMPTY);
1075
1076#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1077PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
1078 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
1079 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer
1080 * is NULL the function checks, instead, for the end of the stream. In this
1081 * case a benign error will be issued if the stream end is not found or if
1082 * extra data has to be consumed.
1083 */
1084PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
1085 PNG_EMPTY);
1086 /* This cleans up when the IDAT LZ stream does not end when the last image
1087 * byte is read; there is still some pending input.
1088 */
1089
1090PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
1091 PNG_EMPTY);
1092 /* Finish a row while reading, dealing with interlacing passes, etc. */
1093#endif
1094
1095/* Initialize the row buffers, etc. */
1096PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
1097
1098#ifdef PNG_READ_TRANSFORMS_SUPPORTED
1099/* Optional call to update the users info structure */
1100PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
1101 png_inforp info_ptr),PNG_EMPTY);
1102#endif
1103
1104/* These are the functions that do the transformations */
1105#ifdef PNG_READ_FILLER_SUPPORTED
1106PNG_INTERNAL_FUNCTION(void,png_do_read_filler,(png_row_infop row_info,
1107 png_bytep row, png_uint_32 filler, png_uint_32 flags),PNG_EMPTY);
1108#endif
1109
1110#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
1111PNG_INTERNAL_FUNCTION(void,png_do_read_swap_alpha,(png_row_infop row_info,
1112 png_bytep row),PNG_EMPTY);
1113#endif
1114
1115#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
1116PNG_INTERNAL_FUNCTION(void,png_do_write_swap_alpha,(png_row_infop row_info,
1117 png_bytep row),PNG_EMPTY);
1118#endif
1119
1120#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
1121PNG_INTERNAL_FUNCTION(void,png_do_read_invert_alpha,(png_row_infop row_info,
1122 png_bytep row),PNG_EMPTY);
1123#endif
1124
1125#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
1126PNG_INTERNAL_FUNCTION(void,png_do_write_invert_alpha,(png_row_infop row_info,
1127 png_bytep row),PNG_EMPTY);
1128#endif
1129
1130#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
1131 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1132PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
1133 png_bytep row, int at_start),PNG_EMPTY);
1134#endif
1135
1136#ifdef PNG_16BIT_SUPPORTED
1137#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1138PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
1139 png_bytep row),PNG_EMPTY);
1140#endif
1141#endif
1142
1143#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1144 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1145PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
1146 png_bytep row),PNG_EMPTY);
1147#endif
1148
1149#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1150PNG_INTERNAL_FUNCTION(int,png_do_rgb_to_gray,(png_structrp png_ptr,
1151 png_row_infop row_info, png_bytep row),PNG_EMPTY);
1152#endif
1153
1154#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
1155PNG_INTERNAL_FUNCTION(void,png_do_gray_to_rgb,(png_row_infop row_info,
1156 png_bytep row),PNG_EMPTY);
1157#endif
1158
1159#ifdef PNG_READ_PACK_SUPPORTED
1160PNG_INTERNAL_FUNCTION(void,png_do_unpack,(png_row_infop row_info,
1161 png_bytep row),PNG_EMPTY);
1162#endif
1163
1164#ifdef PNG_READ_SHIFT_SUPPORTED
1165PNG_INTERNAL_FUNCTION(void,png_do_unshift,(png_row_infop row_info,
1166 png_bytep row, png_const_color_8p sig_bits),PNG_EMPTY);
1167#endif
1168
1169#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1170PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
1171 png_bytep row),PNG_EMPTY);
1172#endif
1173
1174#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
1175PNG_INTERNAL_FUNCTION(void,png_do_scale_16_to_8,(png_row_infop row_info,
1176 png_bytep row),PNG_EMPTY);
1177#endif
1178
1179#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
1180PNG_INTERNAL_FUNCTION(void,png_do_chop,(png_row_infop row_info,
1181 png_bytep row),PNG_EMPTY);
1182#endif
1183
1184#ifdef PNG_READ_QUANTIZE_SUPPORTED
1185PNG_INTERNAL_FUNCTION(void,png_do_quantize,(png_row_infop row_info,
1186 png_bytep row, png_const_bytep palette_lookup,
1187 png_const_bytep quantize_lookup),PNG_EMPTY);
1188
1189# ifdef PNG_CORRECT_PALETTE_SUPPORTED
1190PNG_INTERNAL_FUNCTION(void,png_correct_palette,(png_structrp png_ptr,
1191 png_colorp palette, int num_palette),PNG_EMPTY);
1192# endif
1193#endif
1194
1195#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1196PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
1197 png_bytep row),PNG_EMPTY);
1198#endif
1199
1200#ifdef PNG_WRITE_PACK_SUPPORTED
1201PNG_INTERNAL_FUNCTION(void,png_do_pack,(png_row_infop row_info,
1202 png_bytep row, png_uint_32 bit_depth),PNG_EMPTY);
1203#endif
1204
1205#ifdef PNG_WRITE_SHIFT_SUPPORTED
1206PNG_INTERNAL_FUNCTION(void,png_do_shift,(png_row_infop row_info,
1207 png_bytep row, png_const_color_8p bit_depth),PNG_EMPTY);
1208#endif
1209
1210#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
1211 defined(PNG_READ_ALPHA_MODE_SUPPORTED)
1212PNG_INTERNAL_FUNCTION(void,png_do_compose,(png_row_infop row_info,
1213 png_bytep row, png_structrp png_ptr),PNG_EMPTY);
1214#endif
1215
1216#ifdef PNG_READ_GAMMA_SUPPORTED
1217PNG_INTERNAL_FUNCTION(void,png_do_gamma,(png_row_infop row_info,
1218 png_bytep row, png_structrp png_ptr),PNG_EMPTY);
1219#endif
1220
1221#ifdef PNG_READ_ALPHA_MODE_SUPPORTED
1222PNG_INTERNAL_FUNCTION(void,png_do_encode_alpha,(png_row_infop row_info,
1223 png_bytep row, png_structrp png_ptr),PNG_EMPTY);
1224#endif
1225
1226#ifdef PNG_READ_EXPAND_SUPPORTED
1227PNG_INTERNAL_FUNCTION(void,png_do_expand_palette,(png_row_infop row_info,
1228 png_bytep row, png_const_colorp palette, png_const_bytep trans,
1229 int num_trans),PNG_EMPTY);
1230PNG_INTERNAL_FUNCTION(void,png_do_expand,(png_row_infop row_info,
1231 png_bytep row, png_const_color_16p trans_color),PNG_EMPTY);
1232#endif
1233
1234#ifdef PNG_READ_EXPAND_16_SUPPORTED
1235PNG_INTERNAL_FUNCTION(void,png_do_expand_16,(png_row_infop row_info,
1236 png_bytep row),PNG_EMPTY);
1237#endif
1238
1239/* The following decodes the appropriate chunks, and does error correction,
1240 * then calls the appropriate callback for the chunk if it is valid.
1241 */
1242
1243/* Decode the IHDR chunk */
1244PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,
1245 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1246PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,
1247 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1248PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,
1249 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1250
1251#ifdef PNG_READ_bKGD_SUPPORTED
1252PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,
1253 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1254#endif
1255
1256#ifdef PNG_READ_cHRM_SUPPORTED
1257PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,
1258 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1259#endif
1260
1261#ifdef PNG_READ_gAMA_SUPPORTED
1262PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
1263 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1264#endif
1265
1266#ifdef PNG_READ_hIST_SUPPORTED
1267PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,
1268 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1269#endif
1270
1271#ifdef PNG_READ_iCCP_SUPPORTED
1272PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,
1273 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1274#endif /* PNG_READ_iCCP_SUPPORTED */
1275
1276#ifdef PNG_READ_iTXt_SUPPORTED
1277PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,
1278 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1279#endif
1280
1281#ifdef PNG_READ_oFFs_SUPPORTED
1282PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,
1283 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1284#endif
1285
1286#ifdef PNG_READ_pCAL_SUPPORTED
1287PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,
1288 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1289#endif
1290
1291#ifdef PNG_READ_pHYs_SUPPORTED
1292PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,
1293 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1294#endif
1295
1296#ifdef PNG_READ_sBIT_SUPPORTED
1297PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,
1298 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1299#endif
1300
1301#ifdef PNG_READ_sCAL_SUPPORTED
1302PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,
1303 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1304#endif
1305
1306#ifdef PNG_READ_sPLT_SUPPORTED
1307PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,
1308 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1309#endif /* PNG_READ_sPLT_SUPPORTED */
1310
1311#ifdef PNG_READ_sRGB_SUPPORTED
1312PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,
1313 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1314#endif
1315
1316#ifdef PNG_READ_tEXt_SUPPORTED
1317PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,
1318 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1319#endif
1320
1321#ifdef PNG_READ_tIME_SUPPORTED
1322PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,
1323 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1324#endif
1325
1326#ifdef PNG_READ_tRNS_SUPPORTED
1327PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,
1328 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1329#endif
1330
1331#ifdef PNG_READ_zTXt_SUPPORTED
1332PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,
1333 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1334#endif
1335
1336PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr,
1337 png_uint_32 chunk_name),PNG_EMPTY);
1338
1339#ifdef PNG_READ_SUPPORTED
1340PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
1341 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);
1342 /* This is the function that gets called for unknown chunks. The 'keep'
1343 * argument is either non-zero for a known chunk that has been set to be
1344 * handled as unknown or zero for an unknown chunk. By default the function
1345 * just skips the chunk or errors out if it is critical.
1346 */
1347
1348#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
1349#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
1350PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
1351 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);
1352 /* Exactly as the API png_handle_as_unknown() except that the argument is a
1353 * 32-bit chunk name, not a string.
1354 */
1355#endif
1356#endif /* PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */
1357#endif /* PNG_READ_SUPPORTED */
1358
1359/* Handle the transformations for reading and writing */
1360#ifdef PNG_READ_TRANSFORMS_SUPPORTED
1361PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
1362 png_row_infop row_info),PNG_EMPTY);
1363#endif
1364#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
1365PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
1366 png_row_infop row_info),PNG_EMPTY);
1367#endif
1368
1369#ifdef PNG_READ_TRANSFORMS_SUPPORTED
1370PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),
1371 PNG_EMPTY);
1372#endif
1373
1374#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1375PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
1376 png_inforp info_ptr),PNG_EMPTY);
1377PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
1378 png_inforp info_ptr),PNG_EMPTY);
1379PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
1380PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr,
1381 png_uint_32 length),PNG_EMPTY);
1382PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr),
1383 PNG_EMPTY);
1384PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
1385 PNG_EMPTY);
1386PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
1387 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
1388PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
1389PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
1390 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
1391PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
1392 PNG_EMPTY);
1393PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
1394 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1395PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
1396 png_inforp info_ptr),PNG_EMPTY);
1397PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
1398 png_inforp info_ptr),PNG_EMPTY);
1399PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,
1400 png_bytep row),PNG_EMPTY);
1401PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
1402 png_inforp info_ptr),PNG_EMPTY);
1403PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
1404 png_inforp info_ptr),PNG_EMPTY);
1405PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),
1406 PNG_EMPTY);
1407# ifdef PNG_READ_tEXt_SUPPORTED
1408PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
1409 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1410PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
1411 png_inforp info_ptr),PNG_EMPTY);
1412# endif
1413# ifdef PNG_READ_zTXt_SUPPORTED
1414PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
1415 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1416PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
1417 png_inforp info_ptr),PNG_EMPTY);
1418# endif
1419# ifdef PNG_READ_iTXt_SUPPORTED
1420PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
1421 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1422PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
1423 png_inforp info_ptr),PNG_EMPTY);
1424# endif
1425
1426#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1427
1428#ifdef PNG_MNG_FEATURES_SUPPORTED
1429PNG_INTERNAL_FUNCTION(void,png_do_read_intrapixel,(png_row_infop row_info,
1430 png_bytep row),PNG_EMPTY);
1431PNG_INTERNAL_FUNCTION(void,png_do_write_intrapixel,(png_row_infop row_info,
1432 png_bytep row),PNG_EMPTY);
1433#endif
1434
1435/* Added at libpng version 1.6.0 */
1436#ifdef PNG_GAMMA_SUPPORTED
1437PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
1438 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
1439 /* Set the colorspace gamma with a value provided by the application or by
1440 * the gAMA chunk on read. The value will override anything set by an ICC
1441 * profile.
1442 */
1443
1444PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
1445 png_inforp info_ptr), PNG_EMPTY);
1446 /* Synchronize the info 'valid' flags with the colorspace */
1447
1448PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
1449 png_inforp info_ptr), PNG_EMPTY);
1450 /* Copy the png_struct colorspace to the info_struct and call the above to
1451 * synchronize the flags. Checks for NULL info_ptr and does nothing.
1452 */
1453#endif
1454
1455/* Added at libpng version 1.4.0 */
1456#ifdef PNG_COLORSPACE_SUPPORTED
1457/* These internal functions are for maintaining the colorspace structure within
1458 * a png_info or png_struct (or, indeed, both).
1459 */
1460PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
1461 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
1462 int preferred), PNG_EMPTY);
1463
1464PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
1465 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
1466 int preferred), PNG_EMPTY);
1467
1468#ifdef PNG_sRGB_SUPPORTED
1469PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
1470 png_colorspacerp colorspace, int intent), PNG_EMPTY);
1471 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the
1472 * flags to write them, if it returns false there was a problem and an error
1473 * message has already been output (but the colorspace may still need to be
1474 * synced to record the invalid flag).
1475 */
1476#endif /* sRGB */
1477
1478#ifdef PNG_iCCP_SUPPORTED
1479PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
1480 png_colorspacerp colorspace, png_const_charp name,
1481 png_uint_32 profile_length, png_const_bytep profile, int color_type),
1482 PNG_EMPTY);
1483 /* The 'name' is used for information only */
1484
1485/* Routines for checking parts of an ICC profile. */
1486PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
1487 png_colorspacerp colorspace, png_const_charp name,
1488 png_uint_32 profile_length), PNG_EMPTY);
1489PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
1490 png_colorspacerp colorspace, png_const_charp name,
1491 png_uint_32 profile_length,
1492 png_const_bytep profile /* first 132 bytes only */, int color_type),
1493 PNG_EMPTY);
1494PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
1495 png_colorspacerp colorspace, png_const_charp name,
1496 png_uint_32 profile_length,
1497 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
1498#ifdef PNG_sRGB_SUPPORTED
1499PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
1500 png_const_structrp png_ptr, png_colorspacerp colorspace,
1501 png_const_bytep profile, uLong adler), PNG_EMPTY);
1502 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
1503 * be zero to indicate that it is not available. It is used, if provided,
1504 * as a fast check on the profile when checking to see if it is sRGB.
1505 */
1506#endif
1507#endif /* iCCP */
1508
1509#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1510PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
1511 (png_structrp png_ptr), PNG_EMPTY);
1512 /* Set the rgb_to_gray coefficients from the colorspace Y values */
1513#endif /* READ_RGB_TO_GRAY */
1514#endif /* COLORSPACE */
1515
1516/* Added at libpng version 1.4.0 */
1517PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
1518 png_uint_32 width, png_uint_32 height, int bit_depth,
1519 int color_type, int interlace_type, int compression_type,
1520 int filter_type),PNG_EMPTY);
1521
1522/* Added at libpng version 1.5.10 */
1523#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
1524 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
1525PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
1526 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
1527#endif
1528
1529#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
1530PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
1531 png_const_charp name),PNG_NORETURN);
1532#endif
1533
1534/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
1535 * the end. Always leaves the buffer nul terminated. Never errors out (and
1536 * there is no error code.)
1537 */
1538PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
1539 size_t pos, png_const_charp string),PNG_EMPTY);
1540
1541/* Various internal functions to handle formatted warning messages, currently
1542 * only implemented for warnings.
1543 */
1544#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
1545/* Utility to dump an unsigned value into a buffer, given a start pointer and
1546 * and end pointer (which should point just *beyond* the end of the buffer!)
1547 * Returns the pointer to the start of the formatted string. This utility only
1548 * does unsigned values.
1549 */
1550PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
1551 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
1552
1553/* Convenience macro that takes an array: */
1554#define PNG_FORMAT_NUMBER(buffer,format,number) \
1555 png_format_number(buffer, buffer + (sizeof buffer), format, number)
1556
1557/* Suggested size for a number buffer (enough for 64 bits and a sign!) */
1558#define PNG_NUMBER_BUFFER_SIZE 24
1559
1560/* These are the integer formats currently supported, the name is formed from
1561 * the standard printf(3) format string.
1562 */
1563#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
1564#define PNG_NUMBER_FORMAT_02u 2
1565#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
1566#define PNG_NUMBER_FORMAT_02d 2
1567#define PNG_NUMBER_FORMAT_x 3
1568#define PNG_NUMBER_FORMAT_02x 4
1569#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
1570#endif
1571
1572#ifdef PNG_WARNINGS_SUPPORTED
1573/* New defines and members adding in libpng-1.5.4 */
1574# define PNG_WARNING_PARAMETER_SIZE 32
1575# define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
1576
1577/* An l-value of this type has to be passed to the APIs below to cache the
1578 * values of the parameters to a formatted warning message.
1579 */
1580typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
1581 PNG_WARNING_PARAMETER_SIZE];
1582
1583PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
1584 int number, png_const_charp string),PNG_EMPTY);
1585 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
1586 * including the trailing '\0'.
1587 */
1588PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
1589 (png_warning_parameters p, int number, int format, png_alloc_size_t value),
1590 PNG_EMPTY);
1591 /* Use png_alloc_size_t because it is an unsigned type as big as any we
1592 * need to output. Use the following for a signed value.
1593 */
1594PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
1595 (png_warning_parameters p, int number, int format, png_int_32 value),
1596 PNG_EMPTY);
1597
1598PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
1599 png_warning_parameters p, png_const_charp message),PNG_EMPTY);
1600 /* 'message' follows the X/Open approach of using @1, @2 to insert
1601 * parameters previously supplied using the above functions. Errors in
1602 * specifying the parameters will simply result in garbage substitutions.
1603 */
1604#endif
1605
1606#ifdef PNG_BENIGN_ERRORS_SUPPORTED
1607/* Application errors (new in 1.6); use these functions (declared below) for
1608 * errors in the parameters or order of API function calls on read. The
1609 * 'warning' should be used for an error that can be handled completely; the
1610 * 'error' for one which can be handled safely but which may lose application
1611 * information or settings.
1612 *
1613 * By default these both result in a png_error call prior to release, while in a
1614 * released version the 'warning' is just a warning. However if the application
1615 * explicitly disables benign errors (explicitly permitting the code to lose
1616 * information) they both turn into warnings.
1617 *
1618 * If benign errors aren't supported they end up as the corresponding base call
1619 * (png_warning or png_error.)
1620 */
1621PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
1622 png_const_charp message),PNG_EMPTY);
1623 /* The application provided invalid parameters to an API function or called
1624 * an API function at the wrong time, libpng can completely recover.
1625 */
1626
1627PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
1628 png_const_charp message),PNG_EMPTY);
1629 /* As above but libpng will ignore the call, or attempt some other partial
1630 * recovery from the error.
1631 */
1632#else
1633# define png_app_warning(pp,s) png_warning(pp,s)
1634# define png_app_error(pp,s) png_error(pp,s)
1635#endif
1636
1637PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
1638 png_const_charp message, int error),PNG_EMPTY);
1639 /* Report a recoverable issue in chunk data. On read this is used to report
1640 * a problem found while reading a particular chunk and the
1641 * png_chunk_benign_error or png_chunk_warning function is used as
1642 * appropriate. On write this is used to report an error that comes from
1643 * data set via an application call to a png_set_ API and png_app_error or
1644 * png_app_warning is used as appropriate.
1645 *
1646 * The 'error' parameter must have one of the following values:
1647 */
1648#define PNG_CHUNK_WARNING 0 /* never an error */
1649#define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
1650#define PNG_CHUNK_ERROR 2 /* always an error */
1651
1652/* ASCII to FP interfaces, currently only implemented if sCAL
1653 * support is required.
1654 */
1655#if defined(PNG_sCAL_SUPPORTED)
1656/* MAX_DIGITS is actually the maximum number of characters in an sCAL
1657 * width or height, derived from the precision (number of significant
1658 * digits - a build time settable option) and assumptions about the
1659 * maximum ridiculous exponent.
1660 */
1661#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
1662
1663#ifdef PNG_FLOATING_POINT_SUPPORTED
1664PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
1665 png_charp ascii, png_size_t size, double fp, unsigned int precision),
1666 PNG_EMPTY);
1667#endif /* FLOATING_POINT */
1668
1669#ifdef PNG_FIXED_POINT_SUPPORTED
1670PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
1671 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY);
1672#endif /* FIXED_POINT */
1673#endif /* sCAL */
1674
1675#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1676/* An internal API to validate the format of a floating point number.
1677 * The result is the index of the next character. If the number is
1678 * not valid it will be the index of a character in the supposed number.
1679 *
1680 * The format of a number is defined in the PNG extensions specification
1681 * and this API is strictly conformant to that spec, not anyone elses!
1682 *
1683 * The format as a regular expression is:
1684 *
1685 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1686 *
1687 * or:
1688 *
1689 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1690 *
1691 * The complexity is that either integer or fraction must be present and the
1692 * fraction is permitted to have no digits only if the integer is present.
1693 *
1694 * NOTE: The dangling E problem.
1695 * There is a PNG valid floating point number in the following:
1696 *
1697 * PNG floating point numbers are not greedy.
1698 *
1699 * Working this out requires *TWO* character lookahead (because of the
1700 * sign), the parser does not do this - it will fail at the 'r' - this
1701 * doesn't matter for PNG sCAL chunk values, but it requires more care
1702 * if the value were ever to be embedded in something more complex. Use
1703 * ANSI-C strtod if you need the lookahead.
1704 */
1705/* State table for the parser. */
1706#define PNG_FP_INTEGER 0 /* before or in integer */
1707#define PNG_FP_FRACTION 1 /* before or in fraction */
1708#define PNG_FP_EXPONENT 2 /* before or in exponent */
1709#define PNG_FP_STATE 3 /* mask for the above */
1710#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1711#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1712#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1713#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1714#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
1715
1716/* These three values don't affect the parser. They are set but not used.
1717 */
1718#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
1719#define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
1720#define PNG_FP_NONZERO 256 /* A non-zero value */
1721#define PNG_FP_STICKY 448 /* The above three flags */
1722
1723/* This is available for the caller to store in 'state' if required. Do not
1724 * call the parser after setting it (the parser sometimes clears it.)
1725 */
1726#define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
1727
1728/* Result codes for the parser (boolean - true meants ok, false means
1729 * not ok yet.)
1730 */
1731#define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1732#define PNG_FP_OK 1 /* The number is valid */
1733
1734/* Tests on the sticky non-zero and negative flags. To pass these checks
1735 * the state must also indicate that the whole number is valid - this is
1736 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
1737 * is equivalent to PNG_FP_OK above.)
1738 */
1739#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
1740 /* NZ_MASK: the string is valid and a non-zero negative value */
1741#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
1742 /* Z MASK: the string is valid and a non-zero value. */
1743 /* PNG_FP_SAW_DIGIT: the string is valid. */
1744#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
1745#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
1746#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
1747
1748/* The actual parser. This can be called repeatedly. It updates
1749 * the index into the string and the state variable (which must
1750 * be initialized to 0). It returns a result code, as above. There
1751 * is no point calling the parser any more if it fails to advance to
1752 * the end of the string - it is stuck on an invalid character (or
1753 * terminated by '\0').
1754 *
1755 * Note that the pointer will consume an E or even an E+ and then leave
1756 * a 'maybe' state even though a preceding integer.fraction is valid.
1757 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1758 * a valid number. It's possible to recover from this by calling
1759 * the parser again (from the start, with state 0) but with a string
1760 * that omits the last character (i.e. set the size to the index of
1761 * the problem character.) This has not been tested within libpng.
1762 */
1763PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
1764 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
1765
1766/* This is the same but it checks a complete string and returns true
1767 * only if it just contains a floating point number. As of 1.5.4 this
1768 * function also returns the state at the end of parsing the number if
1769 * it was valid (otherwise it returns 0.) This can be used for testing
1770 * for negative or zero values using the sticky flag.
1771 */
1772PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
1773 png_size_t size),PNG_EMPTY);
1774#endif /* pCAL || sCAL */
1775
1776#if defined(PNG_READ_GAMMA_SUPPORTED) ||\
1777 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
1778/* Added at libpng version 1.5.0 */
1779/* This is a utility to provide a*times/div (rounded) and indicate
1780 * if there is an overflow. The result is a boolean - false (0)
1781 * for overflow, true (1) if no overflow, in which case *res
1782 * holds the result.
1783 */
1784PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
1785 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
1786#endif
1787
1788#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
1789/* Same deal, but issue a warning on overflow and return 0. */
1790PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
1791 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
1792 png_int_32 divided_by),PNG_EMPTY);
1793#endif
1794
1795#ifdef PNG_GAMMA_SUPPORTED
1796/* Calculate a reciprocal - used for gamma values. This returns
1797 * 0 if the argument is 0 in order to maintain an undefined value;
1798 * there are no warnings.
1799 */
1800PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
1801 PNG_EMPTY);
1802
1803#ifdef PNG_READ_GAMMA_SUPPORTED
1804/* The same but gives a reciprocal of the product of two fixed point
1805 * values. Accuracy is suitable for gamma calculations but this is
1806 * not exact - use png_muldiv for that. Only required at present on read.
1807 */
1808PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
1809 png_fixed_point b),PNG_EMPTY);
1810#endif
1811
1812/* Return true if the gamma value is significantly different from 1.0 */
1813PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
1814 PNG_EMPTY);
1815#endif
1816
1817#ifdef PNG_READ_GAMMA_SUPPORTED
1818/* Internal fixed point gamma correction. These APIs are called as
1819 * required to convert single values - they don't need to be fast,
1820 * they are not used when processing image pixel values.
1821 *
1822 * While the input is an 'unsigned' value it must actually be the
1823 * correct bit value - 0..255 or 0..65535 as required.
1824 */
1825PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
1826 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
1827PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
1828 png_fixed_point gamma_value),PNG_EMPTY);
1829PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
1830 png_fixed_point gamma_value),PNG_EMPTY);
1831PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
1832 PNG_EMPTY);
1833PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
1834 int bit_depth),PNG_EMPTY);
1835#endif
1836
1837/* SIMPLIFIED READ/WRITE SUPPORT */
1838#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
1839 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
1840/* The internal structure that png_image::opaque points to. */
1841typedef struct png_control
1842{
1843 png_structp png_ptr;
1844 png_infop info_ptr;
1845 png_voidp error_buf; /* Always a jmp_buf at present. */
1846
1847 png_const_bytep memory; /* Memory buffer. */
1848 png_size_t size; /* Size of the memory buffer. */
1849
1850 unsigned int for_write :1; /* Otherwise it is a read structure */
1851 unsigned int owned_file :1; /* We own the file in io_ptr */
1852} png_control;
1853
1854/* Return the pointer to the jmp_buf from a png_control: necessary because C
1855 * does not reveal the type of the elements of jmp_buf.
1856 */
1857#ifdef __cplusplus
1858# define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
1859#else
1860# define png_control_jmp_buf(pc) ((pc)->error_buf)
1861#endif
1862
1863/* Utility to safely execute a piece of libpng code catching and logging any
1864 * errors that might occur. Returns true on success, false on failure (either
1865 * of the function or as a result of a png_error.)
1866 */
1867PNG_INTERNAL_FUNCTION(void,png_safe_error,(png_structp png_ptr,
1868 png_const_charp error_message),PNG_NORETURN);
1869
1870#ifdef PNG_WARNINGS_SUPPORTED
1871PNG_INTERNAL_FUNCTION(void,png_safe_warning,(png_structp png_ptr,
1872 png_const_charp warning_message),PNG_EMPTY);
1873#else
1874# define png_safe_warning 0/*dummy argument*/
1875#endif
1876
1877PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
1878 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
1879
1880/* Utility to log an error; this also cleans up the png_image; the function
1881 * always returns 0 (false).
1882 */
1883PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
1884 png_const_charp error_message),PNG_EMPTY);
1885
1886#ifndef PNG_SIMPLIFIED_READ_SUPPORTED
1887/* png_image_free is used by the write code but not exported */
1888PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
1889#endif /* !SIMPLIFIED_READ */
1890
1891#endif /* SIMPLIFIED READ/WRITE */
1892
1893#ifdef PNG_FILTER_OPTIMIZATIONS
1894PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,
1895 unsigned int bpp), PNG_EMPTY);
1896 /* This is the initialization function for hardware specific optimizations,
1897 * one implementation (for ARM NEON machines) is contained in
1898 * arm/filter_neon.c. It need not be defined - the generic code will be used
1899 * if not.
1900 */
1901#endif
1902
1903/* Maintainer: Put new private prototypes here ^ */
1904
1905#include "pngdebug.h"
1906
1907#ifdef __cplusplus
1908}
1909#endif
1910
1911#endif /* PNG_VERSION_INFO_ONLY */
1912#endif /* PNGPRIV_H */
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