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Fix harmless warning about NULL in wxStyledTextCtrl code.
[wxWidgets.git] / src / png / pngpriv.h
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b61cc19c
PC		 1/* pngpriv.h - private declarations for use inside libpng
2 *
b61cc19c 3 * For conditions of distribution and use, see copyright notice in png.h
9c0d9ce3 4 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
b61cc19c
PC		 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 *
72281370 8 * Last changed in libpng 1.5.7 [December 15, 2011]
9c0d9ce3 9 *
b61cc19c
PC		 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 PNG_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
9c0d9ce3
DS		 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 */
b61cc19c 40
9c0d9ce3
DS		 41/* This is required for the definition of abort(), used as a last ditch
42 * error handler when all else fails.
43 */
b61cc19c
PC		 44#include <stdlib.h>
45
9c0d9ce3
DS		 46/* This is used to find 'offsetof', used below for alignment tests. */
47#include <stddef.h>
48
49#define PNGLIB_BUILD /*libpng is being built, not used*/
50
51#ifdef PNG_USER_CONFIG
52# include "pngusr.h"
53 /* These should have been defined in pngusr.h */
54# ifndef PNG_USER_PRIVATEBUILD
55# define PNG_USER_PRIVATEBUILD "Custom libpng build"
56# endif
57# ifndef PNG_USER_DLLFNAME_POSTFIX
58# define PNG_USER_DLLFNAME_POSTFIX "Cb"
59# endif
60#endif
61
62/* Is this a build of a DLL where compilation of the object modules requires
63 * different preprocessor settings to those required for a simple library? If
64 * so PNG_BUILD_DLL must be set.
65 *
66 * If libpng is used inside a DLL but that DLL does not export the libpng APIs
67 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
68 * static library of libpng then link the DLL against that.
69 */
70#ifndef PNG_BUILD_DLL
71# ifdef DLL_EXPORT
72 /* This is set by libtool when files are compiled for a DLL; libtool
73 * always compiles twice, even on systems where it isn't necessary. Set
74 * PNG_BUILD_DLL in case it is necessary:
75 */
76# define PNG_BUILD_DLL
77# else
78# ifdef _WINDLL
79 /* This is set by the Microsoft Visual Studio IDE in projects that
80 * build a DLL. It can't easily be removed from those projects (it
81 * isn't visible in the Visual Studio UI) so it is a fairly reliable
82 * indication that PNG_IMPEXP needs to be set to the DLL export
83 * attributes.
84 */
85# define PNG_BUILD_DLL
86# else
87# ifdef __DLL__
88 /* This is set by the Borland C system when compiling for a DLL
89 * (as above.)
90 */
91# define PNG_BUILD_DLL
92# else
93 /* Add additional compiler cases here. */
94# endif
95# endif
96# endif
97#endif /* Setting PNG_BUILD_DLL if required */
98
99/* See pngconf.h for more details: the builder of the library may set this on
100 * the command line to the right thing for the specific compilation system or it
101 * may be automagically set above (at present we know of no system where it does
102 * need to be set on the command line.)
103 *
104 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
105 * setting it to the "import" setting for a DLL build.
106 */
107#ifndef PNG_IMPEXP
108# ifdef PNG_BUILD_DLL
109# define PNG_IMPEXP PNG_DLL_EXPORT
110# else
111 /* Not building a DLL, or the DLL doesn't require specific export
112 * definitions.
113 */
114# define PNG_IMPEXP
115# endif
116#endif
117
118/* No warnings for private or deprecated functions in the build: */
119#ifndef PNG_DEPRECATED
120# define PNG_DEPRECATED
121#endif
122#ifndef PNG_PRIVATE
123# define PNG_PRIVATE
124#endif
125
126#include "png.h"
127#include "pnginfo.h"
128#include "pngstruct.h"
129
130/* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
131#ifndef PNG_DLL_EXPORT
132# define PNG_DLL_EXPORT
133#endif
134
135/* This is used for 16 bit gamma tables - only the top level pointers are const,
136 * this could be changed:
137 */
138typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;
139
140/* Added at libpng-1.2.9 */
141/* Moved to pngpriv.h at libpng-1.5.0 */
142
143/* config.h is created by and PNG_CONFIGURE_LIBPNG is set by the "configure"
144 * script. We may need it here to get the correct configuration on things
145 * like limits.
146 */
147#ifdef PNG_CONFIGURE_LIBPNG
148# ifdef HAVE_CONFIG_H
149# include "config.h"
150# endif
151#endif
152
153/* Moved to pngpriv.h at libpng-1.5.0 */
154/* NOTE: some of these may have been used in external applications as
155 * these definitions were exposed in pngconf.h prior to 1.5.
156 */
157
158/* If you are running on a machine where you cannot allocate more
159 * than 64K of memory at once, uncomment this. While libpng will not
160 * normally need that much memory in a chunk (unless you load up a very
161 * large file), zlib needs to know how big of a chunk it can use, and
162 * libpng thus makes sure to check any memory allocation to verify it
163 * will fit into memory.
164 *
165 * zlib provides 'MAXSEG_64K' which, if defined, indicates the
166 * same limit and pngconf.h (already included) sets the limit
167 * if certain operating systems are detected.
168 */
169#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
170# define PNG_MAX_MALLOC_64K
171#endif
172
173#ifndef PNG_UNUSED
174/* Unused formal parameter warnings are silenced using the following macro
175 * which is expected to have no bad effects on performance (optimizing
176 * compilers will probably remove it entirely). Note that if you replace
177 * it with something other than whitespace, you must include the terminating
178 * semicolon.
179 */
180# define PNG_UNUSED(param) (void)param;
181#endif
182
183/* Just a little check that someone hasn't tried to define something
184 * contradictory.
185 */
186#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
187# undef PNG_ZBUF_SIZE
188# define PNG_ZBUF_SIZE 65536L
189#endif
190
191/* PNG_STATIC is used to mark internal file scope functions if they need to be
192 * accessed for implementation tests (see the code in tests/?*).
193 */
194#ifndef PNG_STATIC
195# define PNG_STATIC static
196#endif
197
72281370
DS		 198/* C99 restrict is used where possible, to do this 'restrict' is defined as
199 * empty if we can't be sure it is supported. configure builds have already
200 * done this work.
201 */
202#ifdef PNG_CONFIGURE_LIBPNG
203# define PNG_RESTRICT restrict
204#else
205 /* Modern compilers support restrict, but assume not for anything not
206 * recognized here:
207 */
208# if defined __GNUC__ || defined _MSC_VER || defined __WATCOMC__
209# define PNG_RESTRICT restrict
210# else
211# define PNG_RESTRICT
212# endif
213#endif
214
9c0d9ce3
DS		 215/* If warnings or errors are turned off the code is disabled or redirected here.
216 * From 1.5.4 functions have been added to allow very limited formatting of
217 * error and warning messages - this code will also be disabled here.
218 */
219#ifdef PNG_WARNINGS_SUPPORTED
220# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
221#else
222# define png_warning(s1,s2) ((void)(s1))
223# define png_chunk_warning(s1,s2) ((void)(s1))
224# define png_warning_parameter(p,number,string) ((void)0)
225# define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
226# define png_warning_parameter_signed(p,number,format,value) ((void)0)
227# define png_formatted_warning(pp,p,message) ((void)(pp))
228# define PNG_WARNING_PARAMETERS(p)
229#endif
230#ifndef PNG_ERROR_TEXT_SUPPORTED
231# define png_error(s1,s2) png_err(s1)
232# define png_chunk_error(s1,s2) png_err(s1)
233# define png_fixed_error(s1,s2) png_err(s1)
234#endif
235
72281370
DS		 236/* C allows up-casts from (void*) to any pointer and (const void*) to any
237 * pointer to a const object. C++ regards this as a type error and requires an
238 * explicit, static, cast and provides the static_cast<> rune to ensure that
239 * const is not cast away.
240 */
241#ifdef __cplusplus
242# define png_voidcast(type, value) static_cast<type>(value)
243#else
244# define png_voidcast(type, value) (value)
245#endif /* __cplusplus */
246
b61cc19c
PC		 247#ifndef PNG_EXTERN
248/* The functions exported by PNG_EXTERN are internal functions, which
249 * aren't usually used outside the library (as far as I know), so it is
250 * debatable if they should be exported at all. In the future, when it
251 * is possible to have run-time registry of chunk-handling functions,
9c0d9ce3 252 * some of these might be made available again.
72281370
DS		 253 *
254 * 1.5.7: turned the use of 'extern' back on, since it is localized to pngpriv.h
255 * it should be safe now (it is unclear why it was turned off.)
b61cc19c 256 */
72281370 257# define PNG_EXTERN extern
b61cc19c
PC		 258#endif
259
9c0d9ce3
DS		 260/* Some fixed point APIs are still required even if not exported because
261 * they get used by the corresponding floating point APIs. This magic
262 * deals with this:
263 */
264#ifdef PNG_FIXED_POINT_SUPPORTED
265# define PNGFAPI PNGAPI
266#else
267# define PNGFAPI /* PRIVATE */
268#endif
269
b61cc19c
PC		 270/* Other defines specific to compilers can go here. Try to keep
271 * them inside an appropriate ifdef/endif pair for portability.
272 */
9c0d9ce3
DS		 273#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
274 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
275 /* png.c requires the following ANSI-C constants if the conversion of
276 * floating point to ASCII is implemented therein:
277 *
278 * DBL_DIG Maximum number of decimal digits (can be set to any constant)
279 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
280 * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
281 */
282# include <float.h>
283
284# if ( ( (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
285 defined(THINK_C) || defined(TARGET_OS_MAC) ) && !wxOSX_USE_IPHONE ) || defined(__SC__)
b61cc19c
PC		 286 /* We need to check that <math.h> hasn't already been included earlier
287 * as it seems it doesn't agree with <fp.h>, yet we should really use
288 * <fp.h> if possible.
289 */
290# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
291# include <fp.h>
292# endif
293# else
294# include <math.h>
295# endif
296# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
297 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
298 * MATH=68881
299 */
300# include <m68881.h>
301# endif
302#endif
303
b61cc19c
PC		 304/* This provides the non-ANSI (far) memory allocation routines. */
305#if defined(__TURBOC__) && defined(__MSDOS__)
306# include <mem.h>
307# include <alloc.h>
308#endif
309
310#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
311 defined(_WIN32) || defined(__WIN32__)
312# include <windows.h> /* defines _WINDOWS_ macro */
313#endif
314
9c0d9ce3
DS		 315/* Moved here around 1.5.0beta36 from pngconf.h */
316/* Users may want to use these so they are not private. Any library
317 * functions that are passed far data must be model-independent.
318 */
319
320/* Memory model/platform independent fns */
321#ifndef PNG_ABORT
322# ifdef _WINDOWS_
323# define PNG_ABORT() ExitProcess(0)
324# else
325# define PNG_ABORT() abort()
326# endif
327#endif
328
329#ifdef USE_FAR_KEYWORD
330/* Use this to make far-to-near assignments */
331# define CHECK 1
332# define NOCHECK 0
333# define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
334# define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
335# define png_strlen _fstrlen
336# define png_memcmp _fmemcmp /* SJT: added */
337# define png_memcpy _fmemcpy
338# define png_memset _fmemset
339#else
340# ifdef _WINDOWS_ /* Favor Windows over C runtime fns */
341# define CVT_PTR(ptr) (ptr)
342# define CVT_PTR_NOCHECK(ptr) (ptr)
343# define png_strlen lstrlenA
344# define png_memcmp memcmp
345# define png_memcpy CopyMemory
346# define png_memset memset
347# else
348# define CVT_PTR(ptr) (ptr)
349# define CVT_PTR_NOCHECK(ptr) (ptr)
350# define png_strlen strlen
351# define png_memcmp memcmp /* SJT: added */
352# define png_memcpy memcpy
353# define png_memset memset
354# endif
355#endif
356
357/* These macros may need to be architecture dependent. */
358#define PNG_ALIGN_NONE 0 /* do not use data alignment */
359#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
360#ifdef offsetof
361# define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
362#else
363# define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
364#endif
365#define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
366
367#ifndef PNG_ALIGN_TYPE
368 /* Default to using aligned access optimizations and requiring alignment to a
369 * multiple of the data type size. Override in a compiler specific fashion
370 * if necessary by inserting tests here:
371 */
372# define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
373#endif
374
375#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
376 /* This is used because in some compiler implementations non-aligned
377 * structure members are supported, so the offsetof approach below fails.
378 * Set PNG_ALIGN_TO_SIZE=0 for compiler combinations where unaligned access
379 * is good for performance. Do not do this unless you have tested the result
380 * and understand it.
381 */
382# define png_alignof(type) (sizeof (type))
383#else
384# if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
385# define png_alignof(type) offsetof(struct{char c; type t;}, t)
386# else
387# if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
388# define png_alignof(type) (1)
389# endif
390 /* Else leave png_alignof undefined to prevent use thereof */
391# endif
392#endif
393
394/* This implicitly assumes alignment is always to a power of 2. */
395#ifdef png_alignof
396# define png_isaligned(ptr, type)\
397 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0)
398#else
399# define png_isaligned(ptr, type) 0
400#endif
401
402/* End of memory model/platform independent support */
403/* End of 1.5.0beta36 move from pngconf.h */
404
405/* CONSTANTS and UTILITY MACROS
406 * These are used internally by libpng and not exposed in the API
407 */
408
b61cc19c 409/* Various modes of operation. Note that after an init, mode is set to
9c0d9ce3
DS		 410 * zero automatically when the structure is created. Three of these
411 * are defined in png.h because they need to be visible to applications
412 * that call png_set_unknown_chunk().
b61cc19c 413 */
9c0d9ce3
DS		 414/* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */
415/* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */
b61cc19c 416#define PNG_HAVE_IDAT 0x04
9c0d9ce3 417/* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */
b61cc19c
PC		 418#define PNG_HAVE_IEND 0x10
419#define PNG_HAVE_gAMA 0x20
420#define PNG_HAVE_cHRM 0x40
421#define PNG_HAVE_sRGB 0x80
422#define PNG_HAVE_CHUNK_HEADER 0x100
423#define PNG_WROTE_tIME 0x200
424#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
425#define PNG_BACKGROUND_IS_GRAY 0x800
426#define PNG_HAVE_PNG_SIGNATURE 0x1000
427#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
428
429/* Flags for the transformations the PNG library does on the image data */
430#define PNG_BGR 0x0001
431#define PNG_INTERLACE 0x0002
432#define PNG_PACK 0x0004
433#define PNG_SHIFT 0x0008
434#define PNG_SWAP_BYTES 0x0010
435#define PNG_INVERT_MONO 0x0020
9c0d9ce3
DS		 436#define PNG_QUANTIZE 0x0040
437#define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */
b61cc19c 438#define PNG_BACKGROUND_EXPAND 0x0100
9c0d9ce3
DS		 439#define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */
440#define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */
b61cc19c
PC		 441#define PNG_RGBA 0x0800
442#define PNG_EXPAND 0x1000
443#define PNG_GAMMA 0x2000
444#define PNG_GRAY_TO_RGB 0x4000
9c0d9ce3
DS		 445#define PNG_FILLER 0x8000
446#define PNG_PACKSWAP 0x10000
447#define PNG_SWAP_ALPHA 0x20000
448#define PNG_STRIP_ALPHA 0x40000
449#define PNG_INVERT_ALPHA 0x80000
450#define PNG_USER_TRANSFORM 0x100000
451#define PNG_RGB_TO_GRAY_ERR 0x200000
452#define PNG_RGB_TO_GRAY_WARN 0x400000
453#define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */
454#define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */
455#define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */
456#define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */
457#define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */
458 /* 0x8000000 unused */
459 /* 0x10000000 unused */
460 /* 0x20000000 unused */
461 /* 0x40000000 unused */
b61cc19c
PC		 462/* Flags for png_create_struct */
463#define PNG_STRUCT_PNG 0x0001
464#define PNG_STRUCT_INFO 0x0002
465
466/* Scaling factor for filter heuristic weighting calculations */
b61cc19c 467#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
b61cc19c
PC		 468#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
469
470/* Flags for the png_ptr->flags rather than declaring a byte for each one */
471#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
472#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
473#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
474#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
475#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
476#define PNG_FLAG_ZLIB_FINISHED 0x0020
477#define PNG_FLAG_ROW_INIT 0x0040
478#define PNG_FLAG_FILLER_AFTER 0x0080
479#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
480#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
481#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
482#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
9c0d9ce3
DS		 483#define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */
484#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */
485#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */
486#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000
487#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000
488#define PNG_FLAG_LIBRARY_MISMATCH 0x20000
489#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000
490#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000
491#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000
492 /* 0x200000 unused */
493 /* 0x400000 unused */
494#define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000 /* Added to libpng-1.4.0 */
495#define PNG_FLAG_ZTXT_CUSTOM_STRATEGY 0x1000000 /* 5 lines added */
496#define PNG_FLAG_ZTXT_CUSTOM_LEVEL 0x2000000 /* to libpng-1.5.4 */
497#define PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL 0x4000000
498#define PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS 0x8000000
499#define PNG_FLAG_ZTXT_CUSTOM_METHOD 0x10000000
500 /* 0x20000000 unused */
501 /* 0x40000000 unused */
b61cc19c
PC		 502
503#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
504 PNG_FLAG_CRC_ANCILLARY_NOWARN)
505
506#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
507 PNG_FLAG_CRC_CRITICAL_IGNORE)
508
509#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
510 PNG_FLAG_CRC_CRITICAL_MASK)
511
9c0d9ce3
DS		 512/* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib
513 * can handle at once. This type need be no larger than 16 bits (so maximum of
514 * 65535), this define allows us to discover how big it is, but limited by the
515 * maximuum for png_size_t. The value can be overriden in a library build
516 * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably
517 * lower value (e.g. 255 works). A lower value may help memory usage (slightly)
518 * and may even improve performance on some systems (and degrade it on others.)
519 */
520#ifndef ZLIB_IO_MAX
521# define ZLIB_IO_MAX ((uInt)-1)
522#endif
523
b61cc19c
PC		 524/* Save typing and make code easier to understand */
525
526#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
527 abs((int)((c1).green) - (int)((c2).green)) + \
528 abs((int)((c1).blue) - (int)((c2).blue)))
529
530/* Added to libpng-1.2.6 JB */
531#define PNG_ROWBYTES(pixel_bits, width) \
532 ((pixel_bits) >= 8 ? \
533 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
534 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
535
536/* PNG_OUT_OF_RANGE returns true if value is outside the range
537 * ideal-delta..ideal+delta. Each argument is evaluated twice.
538 * "ideal" and "delta" should be constants, normally simple
539 * integers, "value" a variable. Added to libpng-1.2.6 JB
540 */
541#define PNG_OUT_OF_RANGE(value, ideal, delta) \
9c0d9ce3
DS		 542 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
543
544/* Conversions between fixed and floating point, only defined if
545 * required (to make sure the code doesn't accidentally use float
546 * when it is supposedly disabled.)
547 */
548#ifdef PNG_FLOATING_POINT_SUPPORTED
549/* The floating point conversion can't overflow, though it can and
550 * does lose accuracy relative to the original fixed point value.
551 * In practice this doesn't matter because png_fixed_point only
552 * stores numbers with very low precision. The png_ptr and s
553 * arguments are unused by default but are there in case error
554 * checking becomes a requirement.
555 */
556#define png_float(png_ptr, fixed, s) (.00001 * (fixed))
557
558/* The fixed point conversion performs range checking and evaluates
559 * its argument multiple times, so must be used with care. The
560 * range checking uses the PNG specification values for a signed
561 * 32 bit fixed point value except that the values are deliberately
562 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
563 * (2^31-1) * 100000). 's' is a string that describes the value being
564 * converted.
565 *
566 * NOTE: this macro will raise a png_error if the range check fails,
567 * therefore it is normally only appropriate to use this on values
568 * that come from API calls or other sources where an out of range
569 * error indicates a programming error, not a data error!
570 *
571 * NOTE: by default this is off - the macro is not used - because the
572 * function call saves a lot of code.
573 */
574#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
575#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
576 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
577#else
578PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp,
579 png_const_charp text));
580#endif
581#endif
582
583/* Constants for known chunk types. If you need to add a chunk, define the name
584 * here. For historical reasons these constants have the form png_<name>; i.e.
585 * the prefix is lower case. Please use decimal values as the parameters to
586 * match the ISO PNG specification and to avoid relying on the C locale
587 * interpretation of character values.
588 *
589 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
590 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
591 * to be generated if required.
592 *
593 * PNG_32b correctly produces a value shifted by up to 24 bits, even on
594 * architectures where (int) is only 16 bits.
595 */
596#define PNG_32b(b,s) ((png_uint_32)(b) << (s))
597#define PNG_CHUNK(b1,b2,b3,b4) \
598 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
599
600#define png_IHDR PNG_CHUNK( 73, 72, 68, 82)
601#define png_IDAT PNG_CHUNK( 73, 68, 65, 84)
602#define png_IEND PNG_CHUNK( 73, 69, 78, 68)
603#define png_PLTE PNG_CHUNK( 80, 76, 84, 69)
604#define png_bKGD PNG_CHUNK( 98, 75, 71, 68)
605#define png_cHRM PNG_CHUNK( 99, 72, 82, 77)
606#define png_gAMA PNG_CHUNK(103, 65, 77, 65)
607#define png_hIST PNG_CHUNK(104, 73, 83, 84)
608#define png_iCCP PNG_CHUNK(105, 67, 67, 80)
609#define png_iTXt PNG_CHUNK(105, 84, 88, 116)
610#define png_oFFs PNG_CHUNK(111, 70, 70, 115)
611#define png_pCAL PNG_CHUNK(112, 67, 65, 76)
612#define png_sCAL PNG_CHUNK(115, 67, 65, 76)
613#define png_pHYs PNG_CHUNK(112, 72, 89, 115)
614#define png_sBIT PNG_CHUNK(115, 66, 73, 84)
615#define png_sPLT PNG_CHUNK(115, 80, 76, 84)
616#define png_sRGB PNG_CHUNK(115, 82, 71, 66)
617#define png_sTER PNG_CHUNK(115, 84, 69, 82)
618#define png_tEXt PNG_CHUNK(116, 69, 88, 116)
619#define png_tIME PNG_CHUNK(116, 73, 77, 69)
620#define png_tRNS PNG_CHUNK(116, 82, 78, 83)
621#define png_zTXt PNG_CHUNK(122, 84, 88, 116)
622
623/* The following will work on (signed char*) strings, whereas the get_uint_32
624 * macro will fail on top-bit-set values because of the sign extension.
625 */
626#define PNG_CHUNK_FROM_STRING(s)\
627 PNG_CHUNK(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3])
628
629/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
630 * signed and the argument is a (char[]) This macro will fail miserably on
631 * systems where (char) is more than 8 bits.
632 */
633#define PNG_STRING_FROM_CHUNK(s,c)\
634 (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\
635 ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c)))
636
637/* Do the same but terminate with a null character. */
638#define PNG_CSTRING_FROM_CHUNK(s,c)\
639 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
640
641/* Test on flag values as defined in the spec (section 5.4): */
642#define PNG_CHUNK_ANCILLIARY(c) (1 & ((c) >> 29))
643#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLIARY(c))
644#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
645#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
646#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
647
648/* Gamma values (new at libpng-1.5.4): */
649#define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
650#define PNG_GAMMA_MAC_INVERSE 65909
651#define PNG_GAMMA_sRGB_INVERSE 45455
b61cc19c
PC		 652
653
654/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
655#ifdef __cplusplus
656extern "C" {
657#endif /* __cplusplus */
658
659/* These functions are used internally in the code. They generally
660 * shouldn't be used unless you are writing code to add or replace some
661 * functionality in libpng. More information about most functions can
662 * be found in the files where the functions are located.
663 */
664
9c0d9ce3
DS		 665/* Check the user version string for compatibility, returns false if the version
666 * numbers aren't compatible.
667 */
668PNG_EXTERN int png_user_version_check(png_structp png_ptr,
669 png_const_charp user_png_ver);
670
b61cc19c 671/* Allocate memory for an internal libpng struct */
9c0d9ce3
DS		 672PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct,PNGARG((int type)),
673 PNG_ALLOCATED);
b61cc19c
PC		 674
675/* Free memory from internal libpng struct */
676PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
677
9c0d9ce3
DS		 678PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct_2,
679 PNGARG((int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)),
680 PNG_ALLOCATED);
b61cc19c 681PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
9c0d9ce3 682 png_free_ptr free_fn, png_voidp mem_ptr));
b61cc19c
PC		 683
684/* Free any memory that info_ptr points to and reset struct. */
685PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
9c0d9ce3 686 png_infop info_ptr));
b61cc19c
PC		 687
688/* Function to allocate memory for zlib. PNGAPI is disallowed. */
9c0d9ce3
DS		 689PNG_EXTERN PNG_FUNCTION(voidpf,png_zalloc,PNGARG((voidpf png_ptr, uInt items,
690 uInt size)),PNG_ALLOCATED);
b61cc19c
PC		 691
692/* Function to free memory for zlib. PNGAPI is disallowed. */
693PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
694
9c0d9ce3
DS		 695/* Next four functions are used internally as callbacks. PNGCBAPI is required
696 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
697 * PNGCBAPI at 1.5.0
698 */
b61cc19c 699
9c0d9ce3
DS		 700PNG_EXTERN void PNGCBAPI png_default_read_data PNGARG((png_structp png_ptr,
701 png_bytep data, png_size_t length));
b61cc19c
PC		 702
703#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
9c0d9ce3
DS		 704PNG_EXTERN void PNGCBAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
705 png_bytep buffer, png_size_t length));
b61cc19c
PC		 706#endif
707
9c0d9ce3
DS		 708PNG_EXTERN void PNGCBAPI png_default_write_data PNGARG((png_structp png_ptr,
709 png_bytep data, png_size_t length));
b61cc19c
PC		 710
711#ifdef PNG_WRITE_FLUSH_SUPPORTED
9c0d9ce3
DS		 712# ifdef PNG_STDIO_SUPPORTED
713PNG_EXTERN void PNGCBAPI png_default_flush PNGARG((png_structp png_ptr));
714# endif
b61cc19c
PC		 715#endif
716
717/* Reset the CRC variable */
718PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
719
720/* Write the "data" buffer to whatever output you are using */
9c0d9ce3
DS		 721PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr,
722 png_const_bytep data, png_size_t length));
723
724/* Read and check the PNG file signature */
725PNG_EXTERN void png_read_sig PNGARG((png_structp png_ptr, png_infop info_ptr));
b61cc19c
PC		 726
727/* Read the chunk header (length + type name) */
728PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
729
730/* Read data from whatever input you are using into the "data" buffer */
731PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
9c0d9ce3 732 png_size_t length));
b61cc19c
PC		 733
734/* Read bytes into buf, and update png_ptr->crc */
735PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
9c0d9ce3 736 png_size_t length));
b61cc19c
PC		 737
738/* Decompress data in a chunk that uses compression */
9c0d9ce3 739#if defined(PNG_READ_COMPRESSED_TEXT_SUPPORTED)
b61cc19c 740PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
9c0d9ce3
DS		 741 int comp_type, png_size_t chunklength, png_size_t prefix_length,
742 png_size_t *data_length));
b61cc19c
PC		 743#endif
744
745/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
746PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
747
748/* Read the CRC from the file and compare it to the libpng calculated CRC */
749PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
750
751/* Calculate the CRC over a section of data. Note that we are only
752 * passing a maximum of 64K on systems that have this as a memory limit,
753 * since this is the maximum buffer size we can specify.
754 */
9c0d9ce3
DS		 755PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr,
756 png_const_bytep ptr, png_size_t length));
b61cc19c
PC		 757
758#ifdef PNG_WRITE_FLUSH_SUPPORTED
759PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
760#endif
761
762/* Write various chunks */
763
764/* Write the IHDR chunk, and update the png_struct with the necessary
765 * information.
766 */
767PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
9c0d9ce3
DS		 768 png_uint_32 height,
769 int bit_depth, int color_type, int compression_method, int filter_method,
770 int interlace_method));
b61cc19c 771
9c0d9ce3
DS		 772PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr,
773 png_const_colorp palette, png_uint_32 num_pal));
b61cc19c
PC		 774
775PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
9c0d9ce3 776 png_size_t length));
b61cc19c
PC		 777
778PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
779
780#ifdef PNG_WRITE_gAMA_SUPPORTED
9c0d9ce3 781# ifdef PNG_FLOATING_POINT_SUPPORTED
b61cc19c 782PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
9c0d9ce3
DS		 783# endif
784# ifdef PNG_FIXED_POINT_SUPPORTED
b61cc19c
PC		 785PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr,
786 png_fixed_point file_gamma));
9c0d9ce3 787# endif
b61cc19c
PC		 788#endif
789
790#ifdef PNG_WRITE_sBIT_SUPPORTED
9c0d9ce3
DS		 791PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr,
792 png_const_color_8p sbit, int color_type));
b61cc19c
PC		 793#endif
794
795#ifdef PNG_WRITE_cHRM_SUPPORTED
9c0d9ce3 796# ifdef PNG_FLOATING_POINT_SUPPORTED
b61cc19c 797PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
9c0d9ce3
DS		 798 double white_x, double white_y,
799 double red_x, double red_y, double green_x, double green_y,
800 double blue_x, double blue_y));
801# endif
b61cc19c 802PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
9c0d9ce3
DS		 803 png_fixed_point int_white_x, png_fixed_point int_white_y,
804 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
805 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
806 png_fixed_point int_blue_y));
b61cc19c
PC		 807#endif
808
809#ifdef PNG_WRITE_sRGB_SUPPORTED
810PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
9c0d9ce3 811 int intent));
b61cc19c
PC		 812#endif
813
814#ifdef PNG_WRITE_iCCP_SUPPORTED
815PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
9c0d9ce3
DS		 816 png_const_charp name, int compression_type,
817 png_const_charp profile, int proflen));
b61cc19c
PC		 818 /* Note to maintainer: profile should be png_bytep */
819#endif
820
821#ifdef PNG_WRITE_sPLT_SUPPORTED
822PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
9c0d9ce3 823 png_const_sPLT_tp palette));
b61cc19c
PC		 824#endif
825
826#ifdef PNG_WRITE_tRNS_SUPPORTED
9c0d9ce3
DS		 827PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr,
828 png_const_bytep trans, png_const_color_16p values, int number,
829 int color_type));
b61cc19c
PC		 830#endif
831
832#ifdef PNG_WRITE_bKGD_SUPPORTED
833PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
9c0d9ce3 834 png_const_color_16p values, int color_type));
b61cc19c
PC		 835#endif
836
837#ifdef PNG_WRITE_hIST_SUPPORTED
9c0d9ce3
DS		 838PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr,
839 png_const_uint_16p hist, int num_hist));
b61cc19c
PC		 840#endif
841
9c0d9ce3 842/* Chunks that have keywords */
b61cc19c
PC		 843#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
844 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
845PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
9c0d9ce3 846 png_const_charp key, png_charpp new_key));
b61cc19c
PC		 847#endif
848
849#ifdef PNG_WRITE_tEXt_SUPPORTED
9c0d9ce3
DS		 850PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_const_charp key,
851 png_const_charp text, png_size_t text_len));
b61cc19c
PC		 852#endif
853
854#ifdef PNG_WRITE_zTXt_SUPPORTED
9c0d9ce3
DS		 855PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_const_charp key,
856 png_const_charp text, png_size_t text_len, int compression));
b61cc19c
PC		 857#endif
858
859#ifdef PNG_WRITE_iTXt_SUPPORTED
860PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
9c0d9ce3
DS		 861 int compression, png_const_charp key, png_const_charp lang,
862 png_const_charp lang_key, png_const_charp text));
b61cc19c
PC		 863#endif
864
865#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
866PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
9c0d9ce3 867 png_infop info_ptr, png_const_textp text_ptr, int num_text));
b61cc19c
PC		 868#endif
869
870#ifdef PNG_WRITE_oFFs_SUPPORTED
871PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
9c0d9ce3 872 png_int_32 x_offset, png_int_32 y_offset, int unit_type));
b61cc19c
PC		 873#endif
874
875#ifdef PNG_WRITE_pCAL_SUPPORTED
876PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
9c0d9ce3
DS		 877 png_int_32 X0, png_int_32 X1, int type, int nparams,
878 png_const_charp units, png_charpp params));
b61cc19c
PC		 879#endif
880
881#ifdef PNG_WRITE_pHYs_SUPPORTED
882PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
9c0d9ce3
DS		 883 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
884 int unit_type));
b61cc19c
PC		 885#endif
886
887#ifdef PNG_WRITE_tIME_SUPPORTED
888PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
9c0d9ce3 889 png_const_timep mod_time));
b61cc19c
PC		 890#endif
891
892#ifdef PNG_WRITE_sCAL_SUPPORTED
b61cc19c 893PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
9c0d9ce3 894 int unit, png_const_charp width, png_const_charp height));
b61cc19c
PC		 895#endif
896
897/* Called when finished processing a row of data */
898PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
899
900/* Internal use only. Called before first row of data */
901PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
902
9c0d9ce3
DS		 903/* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
904 * array of png_ptr->width pixels. If the image is not interlaced or this
905 * is the final pass this just does a png_memcpy, otherwise the "display" flag
906 * is used to determine whether to copy pixels that are not in the current pass.
907 *
908 * Because 'png_do_read_interlace' (below) replicates pixels this allows this
909 * function to achieve the documented 'blocky' appearance during interlaced read
910 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
911 * are not changed if they are not in the current pass, when display is 0.
912 *
913 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
914 *
915 * The API always reads from the png_struct row buffer and always assumes that
916 * it is full width (png_do_read_interlace has already been called.)
917 *
918 * This function is only ever used to write to row buffers provided by the
919 * caller of the relevant libpng API and the row must have already been
920 * transformed by the read transformations.
921 *
922 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
923 * bitmasks for use within the code, otherwise runtime generated masks are used.
924 * The default is compile time masks.
925 */
926#ifndef PNG_USE_COMPILE_TIME_MASKS
927# define PNG_USE_COMPILE_TIME_MASKS 1
b61cc19c 928#endif
b61cc19c 929PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
9c0d9ce3 930 int display));
b61cc19c
PC		 931
932#ifdef PNG_READ_INTERLACING_SUPPORTED
9c0d9ce3
DS		 933/* Expand an interlaced row: the 'row_info' describes the pass data that has
934 * been read in and must correspond to the pixels in 'row', the pixels are
935 * expanded (moved apart) in 'row' to match the final layout, when doing this
936 * the pixels are *replicated* to the intervening space. This is essential for
937 * the correct operation of png_combine_row, above.
b61cc19c 938 */
9c0d9ce3
DS		 939PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
940 png_bytep row, int pass, png_uint_32 transformations));
b61cc19c
PC		 941#endif
942
943/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
944
945#ifdef PNG_WRITE_INTERLACING_SUPPORTED
946/* Grab pixels out of a row for an interlaced pass */
947PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
9c0d9ce3 948 png_bytep row, int pass));
b61cc19c
PC		 949#endif
950
9c0d9ce3
DS		 951/* Unfilter a row: check the filter value before calling this, there is no point
952 * calling it for PNG_FILTER_VALUE_NONE.
953 */
72281370 954PNG_EXTERN void png_read_filter_row PNGARG((png_structp pp, png_row_infop row_info,
9c0d9ce3 955 png_bytep row, png_const_bytep prev_row, int filter));
b61cc19c 956
72281370
DS		 957PNG_EXTERN void png_read_filter_row_up_neon PNGARG((png_row_infop row_info,
958 png_bytep row, png_const_bytep prev_row));
959PNG_EXTERN void png_read_filter_row_sub3_neon PNGARG((png_row_infop row_info,
960 png_bytep row, png_const_bytep prev_row));
961PNG_EXTERN void png_read_filter_row_sub4_neon PNGARG((png_row_infop row_info,
962 png_bytep row, png_const_bytep prev_row));
963PNG_EXTERN void png_read_filter_row_avg3_neon PNGARG((png_row_infop row_info,
964 png_bytep row, png_const_bytep prev_row));
965PNG_EXTERN void png_read_filter_row_avg4_neon PNGARG((png_row_infop row_info,
966 png_bytep row, png_const_bytep prev_row));
967PNG_EXTERN void png_read_filter_row_paeth3_neon PNGARG((png_row_infop row_info,
968 png_bytep row, png_const_bytep prev_row));
969PNG_EXTERN void png_read_filter_row_paeth4_neon PNGARG((png_row_infop row_info,
970 png_bytep row, png_const_bytep prev_row));
971
b61cc19c
PC		 972/* Choose the best filter to use and filter the row data */
973PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
9c0d9ce3 974 png_row_infop row_info));
b61cc19c 975
b61cc19c
PC		 976/* Finish a row while reading, dealing with interlacing passes, etc. */
977PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
978
979/* Initialize the row buffers, etc. */
980PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
9c0d9ce3
DS		 981
982#ifdef PNG_READ_TRANSFORMS_SUPPORTED
b61cc19c
PC		 983/* Optional call to update the users info structure */
984PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
9c0d9ce3
DS		 985 png_infop info_ptr));
986#endif
b61cc19c
PC		 987
988/* These are the functions that do the transformations */
989#ifdef PNG_READ_FILLER_SUPPORTED
990PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
9c0d9ce3 991 png_bytep row, png_uint_32 filler, png_uint_32 flags));
b61cc19c
PC		 992#endif
993
994#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
995PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
9c0d9ce3 996 png_bytep row));
b61cc19c
PC		 997#endif
998
999#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
1000PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
9c0d9ce3 1001 png_bytep row));
b61cc19c
PC		 1002#endif
1003
1004#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
1005PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
9c0d9ce3 1006 png_bytep row));
b61cc19c
PC		 1007#endif
1008
1009#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
1010PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
9c0d9ce3 1011 png_bytep row));
b61cc19c
PC		 1012#endif
1013
1014#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
1015 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
9c0d9ce3
DS		 1016PNG_EXTERN void png_do_strip_channel PNGARG((png_row_infop row_info,
1017 png_bytep row, int at_start));
b61cc19c
PC		 1018#endif
1019
9c0d9ce3 1020#ifdef PNG_16BIT_SUPPORTED
b61cc19c 1021#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
9c0d9ce3
DS		 1022PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info,
1023 png_bytep row));
1024#endif
b61cc19c
PC		 1025#endif
1026
1027#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1028 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
9c0d9ce3
DS		 1029PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info,
1030 png_bytep row));
b61cc19c
PC		 1031#endif
1032
1033#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
9c0d9ce3
DS		 1034PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr,
1035 png_row_infop row_info, png_bytep row));
b61cc19c
PC		 1036#endif
1037
1038#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
1039PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
9c0d9ce3 1040 png_bytep row));
b61cc19c
PC		 1041#endif
1042
1043#ifdef PNG_READ_PACK_SUPPORTED
9c0d9ce3
DS		 1044PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info,
1045 png_bytep row));
b61cc19c
PC		 1046#endif
1047
1048#ifdef PNG_READ_SHIFT_SUPPORTED
9c0d9ce3
DS		 1049PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info,
1050 png_bytep row, png_const_color_8p sig_bits));
b61cc19c
PC		 1051#endif
1052
1053#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
9c0d9ce3
DS		 1054PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info,
1055 png_bytep row));
b61cc19c
PC		 1056#endif
1057
9c0d9ce3
DS		 1058#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
1059PNG_EXTERN void png_do_scale_16_to_8 PNGARG((png_row_infop row_info,
1060 png_bytep row));
1061#endif
1062
1063#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
1064PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info,
1065 png_bytep row));
b61cc19c
PC		 1066#endif
1067
1068#ifdef PNG_READ_QUANTIZE_SUPPORTED
1069PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info,
9c0d9ce3
DS		 1070 png_bytep row, png_const_bytep palette_lookup,
1071 png_const_bytep quantize_lookup));
b61cc19c
PC		 1072
1073# ifdef PNG_CORRECT_PALETTE_SUPPORTED
1074PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
9c0d9ce3 1075 png_colorp palette, int num_palette));
b61cc19c
PC		 1076# endif
1077#endif
1078
1079#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
9c0d9ce3
DS		 1080PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info,
1081 png_bytep row));
b61cc19c
PC		 1082#endif
1083
1084#ifdef PNG_WRITE_PACK_SUPPORTED
1085PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
1086 png_bytep row, png_uint_32 bit_depth));
1087#endif
1088
1089#ifdef PNG_WRITE_SHIFT_SUPPORTED
9c0d9ce3
DS		 1090PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info,
1091 png_bytep row, png_const_color_8p bit_depth));
b61cc19c
PC		 1092#endif
1093
9c0d9ce3
DS		 1094#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
1095 defined(PNG_READ_ALPHA_MODE_SUPPORTED)
1096PNG_EXTERN void png_do_compose PNGARG((png_row_infop row_info,
1097 png_bytep row, png_structp png_ptr));
b61cc19c
PC		 1098#endif
1099
1100#ifdef PNG_READ_GAMMA_SUPPORTED
9c0d9ce3
DS		 1101PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info,
1102 png_bytep row, png_structp png_ptr));
1103#endif
1104
1105#ifdef PNG_READ_ALPHA_MODE_SUPPORTED
1106PNG_EXTERN void png_do_encode_alpha PNGARG((png_row_infop row_info,
1107 png_bytep row, png_structp png_ptr));
b61cc19c
PC		 1108#endif
1109
1110#ifdef PNG_READ_EXPAND_SUPPORTED
1111PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
9c0d9ce3
DS		 1112 png_bytep row, png_const_colorp palette, png_const_bytep trans,
1113 int num_trans));
b61cc19c 1114PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
9c0d9ce3
DS		 1115 png_bytep row, png_const_color_16p trans_color));
1116#endif
1117
1118#ifdef PNG_READ_EXPAND_16_SUPPORTED
1119PNG_EXTERN void png_do_expand_16 PNGARG((png_row_infop row_info,
1120 png_bytep row));
b61cc19c
PC		 1121#endif
1122
1123/* The following decodes the appropriate chunks, and does error correction,
1124 * then calls the appropriate callback for the chunk if it is valid.
1125 */
1126
1127/* Decode the IHDR chunk */
1128PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1129 png_uint_32 length));
b61cc19c 1130PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1131 png_uint_32 length));
b61cc19c 1132PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1133 png_uint_32 length));
b61cc19c
PC		 1134
1135#ifdef PNG_READ_bKGD_SUPPORTED
1136PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1137 png_uint_32 length));
b61cc19c
PC		 1138#endif
1139
1140#ifdef PNG_READ_cHRM_SUPPORTED
1141PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1142 png_uint_32 length));
b61cc19c
PC		 1143#endif
1144
1145#ifdef PNG_READ_gAMA_SUPPORTED
1146PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1147 png_uint_32 length));
b61cc19c
PC		 1148#endif
1149
1150#ifdef PNG_READ_hIST_SUPPORTED
1151PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1152 png_uint_32 length));
b61cc19c
PC		 1153#endif
1154
1155#ifdef PNG_READ_iCCP_SUPPORTED
1156PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1157 png_uint_32 length));
b61cc19c
PC		 1158#endif /* PNG_READ_iCCP_SUPPORTED */
1159
1160#ifdef PNG_READ_iTXt_SUPPORTED
1161PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1162 png_uint_32 length));
b61cc19c
PC		 1163#endif
1164
1165#ifdef PNG_READ_oFFs_SUPPORTED
1166PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1167 png_uint_32 length));
b61cc19c
PC		 1168#endif
1169
1170#ifdef PNG_READ_pCAL_SUPPORTED
1171PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1172 png_uint_32 length));
b61cc19c
PC		 1173#endif
1174
1175#ifdef PNG_READ_pHYs_SUPPORTED
1176PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1177 png_uint_32 length));
b61cc19c
PC		 1178#endif
1179
1180#ifdef PNG_READ_sBIT_SUPPORTED
1181PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1182 png_uint_32 length));
b61cc19c
PC		 1183#endif
1184
1185#ifdef PNG_READ_sCAL_SUPPORTED
1186PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1187 png_uint_32 length));
b61cc19c
PC		 1188#endif
1189
1190#ifdef PNG_READ_sPLT_SUPPORTED
1191PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1192 png_uint_32 length));
b61cc19c
PC		 1193#endif /* PNG_READ_sPLT_SUPPORTED */
1194
1195#ifdef PNG_READ_sRGB_SUPPORTED
1196PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1197 png_uint_32 length));
b61cc19c
PC		 1198#endif
1199
1200#ifdef PNG_READ_tEXt_SUPPORTED
1201PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1202 png_uint_32 length));
b61cc19c
PC		 1203#endif
1204
1205#ifdef PNG_READ_tIME_SUPPORTED
1206PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1207 png_uint_32 length));
b61cc19c
PC		 1208#endif
1209
1210#ifdef PNG_READ_tRNS_SUPPORTED
1211PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1212 png_uint_32 length));
b61cc19c
PC		 1213#endif
1214
1215#ifdef PNG_READ_zTXt_SUPPORTED
1216PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
9c0d9ce3 1217 png_uint_32 length));
b61cc19c
PC		 1218#endif
1219
9c0d9ce3 1220#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
b61cc19c 1221PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
9c0d9ce3
DS		 1222 png_infop info_ptr, png_uint_32 length));
1223#endif
b61cc19c
PC		 1224
1225PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
9c0d9ce3
DS		 1226 png_uint_32 chunk_name));
1227
1228#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1229/* Exactly as png_handle_as_unknown() except that the argument is a 32-bit chunk
1230 * name, not a string.
1231 */
1232PNG_EXTERN int png_chunk_unknown_handling PNGARG((png_structp png_ptr,
1233 png_uint_32 chunk_name));
1234#endif
b61cc19c
PC		 1235
1236/* Handle the transformations for reading and writing */
9c0d9ce3
DS		 1237#ifdef PNG_READ_TRANSFORMS_SUPPORTED
1238PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr,
1239 png_row_infop row_info));
1240#endif
1241#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
1242PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr,
1243 png_row_infop row_info));
1244#endif
b61cc19c 1245
9c0d9ce3 1246#ifdef PNG_READ_TRANSFORMS_SUPPORTED
b61cc19c 1247PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
9c0d9ce3 1248#endif
b61cc19c
PC		 1249
1250#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1251PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
9c0d9ce3 1252 png_infop info_ptr));
b61cc19c 1253PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
9c0d9ce3 1254 png_infop info_ptr));
b61cc19c
PC		 1255PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
1256PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
9c0d9ce3 1257 png_uint_32 length));
b61cc19c
PC		 1258PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
1259PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
1260PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
9c0d9ce3 1261 png_bytep buffer, png_size_t buffer_length));
b61cc19c
PC		 1262PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
1263PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
9c0d9ce3 1264 png_bytep buffer, png_size_t buffer_length));
b61cc19c
PC		 1265PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
1266PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
1267 png_infop info_ptr, png_uint_32 length));
1268PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
1269 png_infop info_ptr));
1270PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
1271 png_infop info_ptr));
1272PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
1273PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
9c0d9ce3 1274 png_infop info_ptr));
b61cc19c 1275PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
9c0d9ce3 1276 png_infop info_ptr));
b61cc19c 1277PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
9c0d9ce3 1278# ifdef PNG_READ_tEXt_SUPPORTED
b61cc19c 1279PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
9c0d9ce3 1280 png_infop info_ptr, png_uint_32 length));
b61cc19c 1281PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
9c0d9ce3
DS		 1282 png_infop info_ptr));
1283# endif
1284# ifdef PNG_READ_zTXt_SUPPORTED
b61cc19c 1285PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
9c0d9ce3 1286 png_infop info_ptr, png_uint_32 length));
b61cc19c 1287PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
9c0d9ce3
DS		 1288 png_infop info_ptr));
1289# endif
1290# ifdef PNG_READ_iTXt_SUPPORTED
b61cc19c 1291PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
9c0d9ce3 1292 png_infop info_ptr, png_uint_32 length));
b61cc19c 1293PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
9c0d9ce3
DS		 1294 png_infop info_ptr));
1295# endif
b61cc19c
PC		 1296
1297#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1298
1299#ifdef PNG_MNG_FEATURES_SUPPORTED
1300PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
9c0d9ce3 1301 png_bytep row));
b61cc19c 1302PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
9c0d9ce3 1303 png_bytep row));
b61cc19c
PC		 1304#endif
1305
1306/* Added at libpng version 1.4.0 */
9c0d9ce3 1307#ifdef PNG_CHECK_cHRM_SUPPORTED
b61cc19c 1308PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
9c0d9ce3
DS		 1309 png_fixed_point int_white_x, png_fixed_point int_white_y,
1310 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
1311 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
1312 png_fixed_point int_blue_y));
b61cc19c
PC		 1313#endif
1314
b61cc19c
PC		 1315#ifdef PNG_CHECK_cHRM_SUPPORTED
1316/* Added at libpng version 1.2.34 and 1.4.0 */
9c0d9ce3 1317/* Currently only used by png_check_cHRM_fixed */
b61cc19c 1318PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,
9c0d9ce3 1319 unsigned long *hi_product, unsigned long *lo_product));
b61cc19c 1320#endif
9c0d9ce3
DS		 1321
1322#ifdef PNG_cHRM_SUPPORTED
1323/* Added at libpng version 1.5.5 */
1324typedef struct png_xy
1325{
1326 png_fixed_point redx, redy;
1327 png_fixed_point greenx, greeny;
1328 png_fixed_point bluex, bluey;
1329 png_fixed_point whitex, whitey;
1330} png_xy;
1331
1332typedef struct png_XYZ
1333{
1334 png_fixed_point redX, redY, redZ;
1335 png_fixed_point greenX, greenY, greenZ;
1336 png_fixed_point blueX, blueY, blueZ;
1337} png_XYZ;
1338
1339/* The conversion APIs return 0 on success, non-zero on a parameter error. They
1340 * allow conversion between the above representations of a color encoding. When
1341 * converting from XYZ end points to chromaticities the absolute magnitude of
1342 * the end points is lost, when converting back the sum of the Y values of the
1343 * three end points will be 1.0
1344 */
1345PNG_EXTERN int png_xy_from_XYZ PNGARG((png_xy *xy, png_XYZ XYZ));
1346PNG_EXTERN int png_XYZ_from_xy PNGARG((png_XYZ *XYZ, png_xy xy));
1347PNG_EXTERN int png_XYZ_from_xy_checked PNGARG((png_structp png_ptr,
1348 png_XYZ *XYZ, png_xy xy));
b61cc19c
PC		 1349#endif
1350
1351/* Added at libpng version 1.4.0 */
1352PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
9c0d9ce3
DS		 1353 png_uint_32 width, png_uint_32 height, int bit_depth,
1354 int color_type, int interlace_type, int compression_type,
1355 int filter_type));
b61cc19c
PC		 1356
1357/* Free all memory used by the read (old method - NOT DLL EXPORTED) */
9c0d9ce3
DS		 1358PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr,
1359 png_infop info_ptr, png_infop end_info_ptr));
b61cc19c
PC		 1360
1361/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1362PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr));
1363
1364#ifdef USE_FAR_KEYWORD /* memory model conversion function */
9c0d9ce3
DS		 1365PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr, png_voidp ptr,
1366 int check));
b61cc19c
PC		 1367#endif /* USE_FAR_KEYWORD */
1368
9c0d9ce3
DS		 1369#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
1370PNG_EXTERN PNG_FUNCTION(void, png_fixed_error, (png_structp png_ptr,
1371 png_const_charp name),PNG_NORETURN);
1372#endif
1373
1374/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
1375 * the end. Always leaves the buffer nul terminated. Never errors out (and
1376 * there is no error code.)
1377 */
1378PNG_EXTERN size_t png_safecat(png_charp buffer, size_t bufsize, size_t pos,
1379 png_const_charp string);
1380
1381/* Various internal functions to handle formatted warning messages, currently
1382 * only implemented for warnings.
1383 */
1384#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
1385/* Utility to dump an unsigned value into a buffer, given a start pointer and
1386 * and end pointer (which should point just *beyond* the end of the buffer!)
1387 * Returns the pointer to the start of the formatted string. This utility only
1388 * does unsigned values.
1389 */
1390PNG_EXTERN png_charp png_format_number(png_const_charp start, png_charp end,
1391 int format, png_alloc_size_t number);
1392
1393/* Convenience macro that takes an array: */
1394#define PNG_FORMAT_NUMBER(buffer,format,number) \
1395 png_format_number(buffer, buffer + (sizeof buffer), format, number)
1396
1397/* Suggested size for a number buffer (enough for 64 bits and a sign!) */
1398#define PNG_NUMBER_BUFFER_SIZE 24
1399
1400/* These are the integer formats currently supported, the name is formed from
1401 * the standard printf(3) format string.
1402 */
1403#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
1404#define PNG_NUMBER_FORMAT_02u 2
1405#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
1406#define PNG_NUMBER_FORMAT_02d 2
1407#define PNG_NUMBER_FORMAT_x 3
1408#define PNG_NUMBER_FORMAT_02x 4
1409#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
1410#endif
1411
1412#ifdef PNG_WARNINGS_SUPPORTED
1413/* New defines and members adding in libpng-1.5.4 */
1414# define PNG_WARNING_PARAMETER_SIZE 32
1415# define PNG_WARNING_PARAMETER_COUNT 8
1416
1417/* An l-value of this type has to be passed to the APIs below to cache the
1418 * values of the parameters to a formatted warning message.
1419 */
1420typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
1421 PNG_WARNING_PARAMETER_SIZE];
1422
1423PNG_EXTERN void png_warning_parameter(png_warning_parameters p, int number,
1424 png_const_charp string);
1425 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
1426 * including the trailing '\0'.
1427 */
1428PNG_EXTERN void png_warning_parameter_unsigned(png_warning_parameters p,
1429 int number, int format, png_alloc_size_t value);
1430 /* Use png_alloc_size_t because it is an unsigned type as big as any we
1431 * need to output. Use the following for a signed value.
1432 */
1433PNG_EXTERN void png_warning_parameter_signed(png_warning_parameters p,
1434 int number, int format, png_int_32 value);
1435
1436PNG_EXTERN void png_formatted_warning(png_structp png_ptr,
1437 png_warning_parameters p, png_const_charp message);
1438 /* 'message' follows the X/Open approach of using @1, @2 to insert
1439 * parameters previously supplied using the above functions. Errors in
1440 * specifying the paramters will simple result in garbage substitutions.
1441 */
1442#endif
1443
1444/* ASCII to FP interfaces, currently only implemented if sCAL
1445 * support is required.
1446 */
1447#if defined(PNG_READ_sCAL_SUPPORTED)
1448/* MAX_DIGITS is actually the maximum number of characters in an sCAL
1449 * width or height, derived from the precision (number of significant
1450 * digits - a build time settable option) and assumpitions about the
1451 * maximum ridiculous exponent.
1452 */
1453#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
1454
1455#ifdef PNG_FLOATING_POINT_SUPPORTED
1456PNG_EXTERN void png_ascii_from_fp PNGARG((png_structp png_ptr, png_charp ascii,
1457 png_size_t size, double fp, unsigned int precision));
1458#endif /* FLOATING_POINT */
1459
1460#ifdef PNG_FIXED_POINT_SUPPORTED
1461PNG_EXTERN void png_ascii_from_fixed PNGARG((png_structp png_ptr,
1462 png_charp ascii, png_size_t size, png_fixed_point fp));
1463#endif /* FIXED_POINT */
1464#endif /* READ_sCAL */
1465
1466#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1467/* An internal API to validate the format of a floating point number.
1468 * The result is the index of the next character. If the number is
1469 * not valid it will be the index of a character in the supposed number.
1470 *
1471 * The format of a number is defined in the PNG extensions specification
1472 * and this API is strictly conformant to that spec, not anyone elses!
1473 *
1474 * The format as a regular expression is:
1475 *
1476 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1477 *
1478 * or:
1479 *
1480 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1481 *
1482 * The complexity is that either integer or fraction must be present and the
1483 * fraction is permitted to have no digits only if the integer is present.
1484 *
1485 * NOTE: The dangling E problem.
1486 * There is a PNG valid floating point number in the following:
1487 *
1488 * PNG floating point numb1.ers are not greedy.
1489 *
1490 * Working this out requires *TWO* character lookahead (because of the
1491 * sign), the parser does not do this - it will fail at the 'r' - this
1492 * doesn't matter for PNG sCAL chunk values, but it requires more care
1493 * if the value were ever to be embedded in something more complex. Use
1494 * ANSI-C strtod if you need the lookahead.
1495 */
1496/* State table for the parser. */
1497#define PNG_FP_INTEGER 0 /* before or in integer */
1498#define PNG_FP_FRACTION 1 /* before or in fraction */
1499#define PNG_FP_EXPONENT 2 /* before or in exponent */
1500#define PNG_FP_STATE 3 /* mask for the above */
1501#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1502#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1503#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1504#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1505#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
1506
1507/* These three values don't affect the parser. They are set but not used.
1508 */
1509#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
1510#define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
1511#define PNG_FP_NONZERO 256 /* A non-zero value */
1512#define PNG_FP_STICKY 448 /* The above three flags */
b61cc19c 1513
9c0d9ce3
DS		 1514/* This is available for the caller to store in 'state' if required. Do not
1515 * call the parser after setting it (the parser sometimes clears it.)
1516 */
1517#define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
1518
1519/* Result codes for the parser (boolean - true meants ok, false means
1520 * not ok yet.)
1521 */
1522#define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1523#define PNG_FP_OK 1 /* The number is valid */
1524
1525/* Tests on the sticky non-zero and negative flags. To pass these checks
1526 * the state must also indicate that the whole number is valid - this is
1527 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
1528 * is equivalent to PNG_FP_OK above.)
1529 */
1530#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
1531 /* NZ_MASK: the string is valid and a non-zero negative value */
1532#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
1533 /* Z MASK: the string is valid and a non-zero value. */
1534 /* PNG_FP_SAW_DIGIT: the string is valid. */
1535#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
1536#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
1537#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
1538
1539/* The actual parser. This can be called repeatedly, it updates
1540 * the index into the string and the state variable (which must
1541 * be initialzed to 0). It returns a result code, as above. There
1542 * is no point calling the parser any more if it fails to advance to
1543 * the end of the string - it is stuck on an invalid character (or
1544 * terminated by '\0').
1545 *
1546 * Note that the pointer will consume an E or even an E+ then leave
1547 * a 'maybe' state even though a preceding integer.fraction is valid.
1548 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1549 * a valid number. It's possible to recover from this by calling
1550 * the parser again (from the start, with state 0) but with a string
1551 * that omits the last character (i.e. set the size to the index of
1552 * the problem character.) This has not been tested within libpng.
1553 */
1554PNG_EXTERN int png_check_fp_number PNGARG((png_const_charp string,
1555 png_size_t size, int *statep, png_size_tp whereami));
1556
1557/* This is the same but it checks a complete string and returns true
1558 * only if it just contains a floating point number. As of 1.5.4 this
1559 * function also returns the state at the end of parsing the number if
1560 * it was valid (otherwise it returns 0.) This can be used for testing
1561 * for negative or zero values using the sticky flag.
1562 */
1563PNG_EXTERN int png_check_fp_string PNGARG((png_const_charp string,
1564 png_size_t size));
1565#endif /* pCAL || sCAL */
1566
1567#if defined(PNG_READ_GAMMA_SUPPORTED) ||\
1568 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
1569/* Added at libpng version 1.5.0 */
1570/* This is a utility to provide a*times/div (rounded) and indicate
1571 * if there is an overflow. The result is a boolean - false (0)
1572 * for overflow, true (1) if no overflow, in which case *res
1573 * holds the result.
1574 */
1575PNG_EXTERN int png_muldiv PNGARG((png_fixed_point_p res, png_fixed_point a,
1576 png_int_32 multiplied_by, png_int_32 divided_by));
b61cc19c 1577#endif
9c0d9ce3
DS		 1578
1579#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
1580/* Same deal, but issue a warning on overflow and return 0. */
1581PNG_EXTERN png_fixed_point png_muldiv_warn PNGARG((png_structp png_ptr,
1582 png_fixed_point a, png_int_32 multiplied_by, png_int_32 divided_by));
b61cc19c 1583#endif
9c0d9ce3
DS		 1584
1585#ifdef PNG_READ_GAMMA_SUPPORTED
1586/* Calculate a reciprocal - used for gamma values. This returns
1587 * 0 if the argument is 0 in order to maintain an undefined value,
1588 * there are no warnings.
1589 */
1590PNG_EXTERN png_fixed_point png_reciprocal PNGARG((png_fixed_point a));
1591
1592/* The same but gives a reciprocal of the product of two fixed point
1593 * values. Accuracy is suitable for gamma calculations but this is
1594 * not exact - use png_muldiv for that.
1595 */
1596PNG_EXTERN png_fixed_point png_reciprocal2 PNGARG((png_fixed_point a,
1597 png_fixed_point b));
1598#endif
1599
1600#ifdef PNG_READ_GAMMA_SUPPORTED
1601/* Internal fixed point gamma correction. These APIs are called as
1602 * required to convert single values - they don't need to be fast,
1603 * they are not used when processing image pixel values.
1604 *
1605 * While the input is an 'unsigned' value it must actually be the
1606 * correct bit value - 0..255 or 0..65535 as required.
1607 */
1608PNG_EXTERN png_uint_16 png_gamma_correct PNGARG((png_structp png_ptr,
1609 unsigned int value, png_fixed_point gamma_value));
1610PNG_EXTERN int png_gamma_significant PNGARG((png_fixed_point gamma_value));
1611PNG_EXTERN png_uint_16 png_gamma_16bit_correct PNGARG((unsigned int value,
1612 png_fixed_point gamma_value));
1613PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned int value,
1614 png_fixed_point gamma_value));
1615PNG_EXTERN void png_destroy_gamma_table(png_structp png_ptr);
1616PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
1617 int bit_depth));
b61cc19c
PC		 1618#endif
1619
1620/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
1621
9c0d9ce3
DS		 1622#include "pngdebug.h"
1623
b61cc19c
PC		 1624#ifdef __cplusplus
1625}
1626#endif
1627
b61cc19c 1628#endif /* PNGPRIV_H */
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