2
/* pngpriv.h - private declarations for use inside libpng
4
* For conditions of distribution and use, see copyright notice in png.h
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* Copyright (c) 1998-2011 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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* Last changed in libpng 1.5.0 [January 6, 2011]
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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/* The symbols declared in this file (including the functions declared
17
* as PNG_EXTERN) are PRIVATE. They are not part of the libpng public
18
* interface, and are not recommended for use by regular applications.
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* Some of them may become public in the future; others may stay private,
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* change in an incompatible way, or even disappear.
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* Although the libpng users are not forbidden to include this header,
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* they should be well aware of the issues that may arise from doing so.
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/* This is required for the definition of abort(), used as a last ditch
29
* error handler when all else fails.
34
#ifdef PNG_USER_CONFIG
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/* These should have been defined in pngusr.h */
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# ifndef PNG_USER_PRIVATEBUILD
38
# define PNG_USER_PRIVATEBUILD "Custom libpng build"
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# ifndef PNG_USER_DLLFNAME_POSTFIX
41
# define PNG_USER_DLLFNAME_POSTFIX "Cb"
46
#include "pngstruct.h"
48
/* This is used for 16 bit gamma tables - only the top level pointers are const,
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* this could be changed:
51
typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;
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/* Added at libpng-1.2.9 */
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/* Moved to pngpriv.h at libpng-1.5.0 */
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/* config.h is created by and PNG_CONFIGURE_LIBPNG is set by the "configure"
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* script. We may need it here to get the correct configuration on things
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#ifdef PNG_CONFIGURE_LIBPNG
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/* Moved to pngpriv.h at libpng-1.5.0 */
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/* NOTE: some of these may have been used in external applications as
68
* these definitions were exposed in pngconf.h prior to 1.5.
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/* If you are running on a machine where you cannot allocate more
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* than 64K of memory at once, uncomment this. While libpng will not
73
* normally need that much memory in a chunk (unless you load up a very
74
* large file), zlib needs to know how big of a chunk it can use, and
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* libpng thus makes sure to check any memory allocation to verify it
76
* will fit into memory.
78
* zlib provides 'MAXSEG_64K' which, if defined, indicates the
79
* same limit and pngconf.h (already included) sets the limit
80
* if certain operating systems are detected.
82
#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
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# define PNG_MAX_MALLOC_64K
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/* Unused formal parameter warnings are silenced using the following macro
87
* which is expected to have no bad effects on performance (optimizing
88
* compilers will probably remove it entirely). Note that if you replace
89
* it with something other than whitespace, you must include the terminating
92
#define PNG_UNUSED(param) (void)param;
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/* Just a little check that someone hasn't tried to define something
97
#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
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# define PNG_ZBUF_SIZE 65536L
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/* If warnings or errors are turned off the code is disabled
103
* or redirected here.
105
#ifndef PNG_WARNINGS_SUPPORTED
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# define png_warning(s1,s2) ((void)0)
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# define png_chunk_warning(s1,s2) ((void)0)
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#ifndef PNG_ERROR_TEXT_SUPPORTED
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# define png_error(s1,s2) png_err(s1)
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# define png_chunk_error(s1,s2) png_err(s1)
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# define png_fixed_error(s1,s2) png_err(s1)
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/* The functions exported by PNG_EXTERN are internal functions, which
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* aren't usually used outside the library (as far as I know), so it is
118
* debatable if they should be exported at all. In the future, when it
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* is possible to have run-time registry of chunk-handling functions,
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* some of these might be made available again.
121
# define PNG_EXTERN extern
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/* Some fixed point APIs are still required even if not exported because
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* they get used by the corresponding floating point APIs. This magic
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#ifdef PNG_FIXED_POINT_SUPPORTED
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# define PNGFAPI PNGAPI
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# define PNGFAPI /* PRIVATE */
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/* Other defines specific to compilers can go here. Try to keep
137
* them inside an appropriate ifdef/endif pair for portability.
139
#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
140
defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
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/* png.c requires the following ANSI-C constants if the conversion of
142
* floating point to ASCII is implemented therein:
144
* DBL_DIG Maximum number of decimal digits (can be set to any constant)
145
* DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
146
* DBL_MAX Maximum floating point number (can be set to an arbitrary value)
150
# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
151
defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
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/* We need to check that <math.h> hasn't already been included earlier
153
* as it seems it doesn't agree with <fp.h>, yet we should really use
154
* <fp.h> if possible.
156
# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
162
# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
163
/* Amiga SAS/C: We must include builtin FPU functions when compiling using
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/* This provides the non-ANSI (far) memory allocation routines. */
171
#if defined(__TURBOC__) && defined(__MSDOS__)
176
#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
177
defined(_WIN32) || defined(__WIN32__)
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# include <windows.h> /* defines _WINDOWS_ macro */
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/* Moved here around 1.5.0beta36 from pngconf.h */
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/* Users may want to use these so they are not private. Any library
183
* functions that are passed far data must be model-independent.
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/* Memory model/platform independent fns */
189
# define PNG_ABORT() ExitProcess(0)
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# define PNG_ABORT() abort()
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#ifdef USE_FAR_KEYWORD
196
/* Use this to make far-to-near assignments */
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# define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
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# define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
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# define png_strcpy _fstrcpy
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# define png_strncpy _fstrncpy /* Added to v 1.2.6 */
203
# define png_strlen _fstrlen
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# define png_memcmp _fmemcmp /* SJT: added */
205
# define png_memcpy _fmemcpy
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# define png_memset _fmemset
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# define png_sprintf sprintf
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# ifdef _WINDOWS_ /* Favor Windows over C runtime fns */
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# define CVT_PTR(ptr) (ptr)
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# define CVT_PTR_NOCHECK(ptr) (ptr)
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# define png_strcpy lstrcpyA
213
# define png_strncpy lstrcpynA
214
# define png_strlen lstrlenA
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# define png_memcmp memcmp
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# define png_memcpy CopyMemory
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# define png_memset memset
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# define png_sprintf wsprintfA
220
# define CVT_PTR(ptr) (ptr)
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# define CVT_PTR_NOCHECK(ptr) (ptr)
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# define png_strcpy strcpy
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# define png_strncpy strncpy /* Added to v 1.2.6 */
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# define png_strlen strlen
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# define png_memcmp memcmp /* SJT: added */
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# define png_memcpy memcpy
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# define png_memset memset
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# define png_sprintf sprintf
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/* End of memory model/platform independent support */
233
#ifndef PNG_NO_SNPRINTF
235
# define png_snprintf _snprintf /* Added to v 1.2.19 */
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# define png_snprintf2 _snprintf
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# define png_snprintf6 _snprintf
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# define png_snprintf snprintf /* Added to v 1.2.19 */
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# define png_snprintf2 snprintf
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# define png_snprintf6 snprintf
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/* You don't have or don't want to use snprintf(). Caution: Using
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* sprintf instead of snprintf exposes your application to accidental
246
* or malevolent buffer overflows. If you don't have snprintf()
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* as a general rule you should provide one (you can get one from
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# define png_snprintf(s1,n,fmt,x1) png_sprintf(s1,fmt,x1)
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# define png_snprintf2(s1,n,fmt,x1,x2) png_sprintf(s1,fmt,x1,x2)
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# define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \
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png_sprintf(s1,fmt,x1,x2,x3,x4,x5,x6)
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/* End of 1.5.0beta36 move from pngconf.h */
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/* CONSTANTS and UTILITY MACROS
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* These are used internally by libpng and not exposed in the API
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/* Various modes of operation. Note that after an init, mode is set to
262
* zero automatically when the structure is created.
264
#define PNG_HAVE_IHDR 0x01
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#define PNG_HAVE_PLTE 0x02
266
#define PNG_HAVE_IDAT 0x04
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#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
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#define PNG_HAVE_IEND 0x10
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#define PNG_HAVE_gAMA 0x20
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#define PNG_HAVE_cHRM 0x40
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#define PNG_HAVE_sRGB 0x80
272
#define PNG_HAVE_CHUNK_HEADER 0x100
273
#define PNG_WROTE_tIME 0x200
274
#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
275
#define PNG_BACKGROUND_IS_GRAY 0x800
276
#define PNG_HAVE_PNG_SIGNATURE 0x1000
277
#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
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/* Flags for the transformations the PNG library does on the image data */
280
#define PNG_BGR 0x0001
281
#define PNG_INTERLACE 0x0002
282
#define PNG_PACK 0x0004
283
#define PNG_SHIFT 0x0008
284
#define PNG_SWAP_BYTES 0x0010
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#define PNG_INVERT_MONO 0x0020
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#define PNG_QUANTIZE 0x0040
287
#define PNG_BACKGROUND 0x0080
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#define PNG_BACKGROUND_EXPAND 0x0100
290
#define PNG_16_TO_8 0x0400
291
#define PNG_RGBA 0x0800
292
#define PNG_EXPAND 0x1000
293
#define PNG_GAMMA 0x2000
294
#define PNG_GRAY_TO_RGB 0x4000
295
#define PNG_FILLER 0x8000L
296
#define PNG_PACKSWAP 0x10000L
297
#define PNG_SWAP_ALPHA 0x20000L
298
#define PNG_STRIP_ALPHA 0x40000L
299
#define PNG_INVERT_ALPHA 0x80000L
300
#define PNG_USER_TRANSFORM 0x100000L
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#define PNG_RGB_TO_GRAY_ERR 0x200000L
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#define PNG_RGB_TO_GRAY_WARN 0x400000L
303
#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
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/* 0x800000L Unused */
305
#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
306
#define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
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/* 0x4000000L unused */
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/* 0x8000000L unused */
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/* 0x10000000L unused */
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/* 0x20000000L unused */
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/* 0x40000000L unused */
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/* Flags for png_create_struct */
314
#define PNG_STRUCT_PNG 0x0001
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#define PNG_STRUCT_INFO 0x0002
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/* Scaling factor for filter heuristic weighting calculations */
318
#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
319
#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
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/* Flags for the png_ptr->flags rather than declaring a byte for each one */
322
#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
323
#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
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#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
325
#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
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#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
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#define PNG_FLAG_ZLIB_FINISHED 0x0020
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#define PNG_FLAG_ROW_INIT 0x0040
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#define PNG_FLAG_FILLER_AFTER 0x0080
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#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
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#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
332
#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
333
#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
337
#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
338
#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
339
#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
340
#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
341
#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
342
#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
343
#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
344
#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
345
#define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000L /* Added to libpng-1.4.0 */
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/* 0x1000000L unused */
347
/* 0x2000000L unused */
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/* 0x4000000L unused */
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/* 0x8000000L unused */
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/* 0x10000000L unused */
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/* 0x20000000L unused */
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/* 0x40000000L unused */
354
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
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PNG_FLAG_CRC_ANCILLARY_NOWARN)
357
#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
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PNG_FLAG_CRC_CRITICAL_IGNORE)
360
#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
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PNG_FLAG_CRC_CRITICAL_MASK)
363
/* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib
364
* can handle at once. This type need be no larger than 16 bits (so maximum of
365
* 65535), this define allows us to discover how big it is, but limited by the
366
* maximuum for png_size_t. The value can be overriden in a library build
367
* (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably
368
* lower value (e.g. 255 works). A lower value may help memory usage (slightly)
369
* and may even improve performance on some systems (and degrade it on others.)
372
# define ZLIB_IO_MAX ((uInt)-1)
375
/* Save typing and make code easier to understand */
377
#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
378
abs((int)((c1).green) - (int)((c2).green)) + \
379
abs((int)((c1).blue) - (int)((c2).blue)))
381
/* Added to libpng-1.2.6 JB */
382
#define PNG_ROWBYTES(pixel_bits, width) \
383
((pixel_bits) >= 8 ? \
384
((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
385
(( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
387
/* PNG_OUT_OF_RANGE returns true if value is outside the range
388
* ideal-delta..ideal+delta. Each argument is evaluated twice.
389
* "ideal" and "delta" should be constants, normally simple
390
* integers, "value" a variable. Added to libpng-1.2.6 JB
392
#define PNG_OUT_OF_RANGE(value, ideal, delta) \
393
( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
395
/* Conversions between fixed and floating point, only defined if
396
* required (to make sure the code doesn't accidentally use float
397
* when it is supposedly disabled.)
399
#ifdef PNG_FLOATING_POINT_SUPPORTED
400
/* The floating point conversion can't overflow, though it can and
401
* does lose accuracy relative to the original fixed point value.
402
* In practice this doesn't matter because png_fixed_point only
403
* stores numbers with very low precision. The png_ptr and s
404
* arguments are unused by default but are there in case error
405
* checking becomes a requirement.
407
#define png_float(png_ptr, fixed, s) (.00001 * (fixed))
409
/* The fixed point conversion performs range checking and evaluates
410
* its argument multiple times, so must be used with care. The
411
* range checking uses the PNG specification values for a signed
412
* 32 bit fixed point value except that the values are deliberately
413
* rounded-to-zero to an integral value - 21474 (21474.83 is roughly
414
* (2^31-1) * 100000). 's' is a string that describes the value being
417
* NOTE: this macro will raise a png_error if the range check fails,
418
* therefore it is normally only appropriate to use this on values
419
* that come from API calls or other sources where an out of range
420
* error indicates a programming error, not a data error!
422
* NOTE: by default this is off - the macro is not used - because the
423
* function call saves a lot of code.
425
#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
426
#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
427
((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
429
PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp,
430
png_const_charp text));
434
/* Constant strings for known chunk types. If you need to add a chunk,
435
* define the name here, and add an invocation of the macro wherever it's
438
#define PNG_IHDR PNG_CONST png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
439
#define PNG_IDAT PNG_CONST png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
440
#define PNG_IEND PNG_CONST png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
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#define PNG_PLTE PNG_CONST png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
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#define PNG_bKGD PNG_CONST png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
443
#define PNG_cHRM PNG_CONST png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
444
#define PNG_gAMA PNG_CONST png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
445
#define PNG_hIST PNG_CONST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
446
#define PNG_iCCP PNG_CONST png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
447
#define PNG_iTXt PNG_CONST png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
448
#define PNG_oFFs PNG_CONST png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
449
#define PNG_pCAL PNG_CONST png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
450
#define PNG_sCAL PNG_CONST png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
451
#define PNG_pHYs PNG_CONST png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
452
#define PNG_sBIT PNG_CONST png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
453
#define PNG_sPLT PNG_CONST png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
454
#define PNG_sRGB PNG_CONST png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
455
#define PNG_sTER PNG_CONST png_byte png_sTER[5] = {115, 84, 69, 82, '\0'}
456
#define PNG_tEXt PNG_CONST png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
457
#define PNG_tIME PNG_CONST png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
458
#define PNG_tRNS PNG_CONST png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
459
#define PNG_zTXt PNG_CONST png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
462
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
465
#endif /* __cplusplus */
467
/* These functions are used internally in the code. They generally
468
* shouldn't be used unless you are writing code to add or replace some
469
* functionality in libpng. More information about most functions can
470
* be found in the files where the functions are located.
473
/* Allocate memory for an internal libpng struct */
474
PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct,PNGARG((int type)),
477
/* Free memory from internal libpng struct */
478
PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
480
PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct_2,
481
PNGARG((int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)),
483
PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
484
png_free_ptr free_fn, png_voidp mem_ptr));
486
/* Free any memory that info_ptr points to and reset struct. */
487
PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
488
png_infop info_ptr));
490
/* Function to allocate memory for zlib. PNGAPI is disallowed. */
491
PNG_EXTERN PNG_FUNCTION(voidpf,png_zalloc,PNGARG((voidpf png_ptr, uInt items,
492
uInt size)),PNG_ALLOCATED);
494
/* Function to free memory for zlib. PNGAPI is disallowed. */
495
PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
497
/* Next four functions are used internally as callbacks. PNGCBAPI is required
498
* but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
502
PNG_EXTERN void PNGCBAPI png_default_read_data PNGARG((png_structp png_ptr,
503
png_bytep data, png_size_t length));
505
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
506
PNG_EXTERN void PNGCBAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
507
png_bytep buffer, png_size_t length));
510
PNG_EXTERN void PNGCBAPI png_default_write_data PNGARG((png_structp png_ptr,
511
png_bytep data, png_size_t length));
513
#ifdef PNG_WRITE_FLUSH_SUPPORTED
514
# ifdef PNG_STDIO_SUPPORTED
515
PNG_EXTERN void PNGCBAPI png_default_flush PNGARG((png_structp png_ptr));
519
/* Reset the CRC variable */
520
PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
522
/* Write the "data" buffer to whatever output you are using */
523
PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr,
524
png_const_bytep data, png_size_t length));
526
/* Read and check the PNG file signature */
527
PNG_EXTERN void png_read_sig PNGARG((png_structp png_ptr, png_infop info_ptr));
529
/* Read the chunk header (length + type name) */
530
PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
532
/* Read data from whatever input you are using into the "data" buffer */
533
PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
536
/* Read bytes into buf, and update png_ptr->crc */
537
PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
540
/* Decompress data in a chunk that uses compression */
541
#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
542
defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
543
PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
544
int comp_type, png_size_t chunklength, png_size_t prefix_length,
545
png_size_t *data_length));
548
/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
549
PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
551
/* Read the CRC from the file and compare it to the libpng calculated CRC */
552
PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
554
/* Calculate the CRC over a section of data. Note that we are only
555
* passing a maximum of 64K on systems that have this as a memory limit,
556
* since this is the maximum buffer size we can specify.
558
PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr,
559
png_const_bytep ptr, png_size_t length));
561
#ifdef PNG_WRITE_FLUSH_SUPPORTED
562
PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
565
/* Write various chunks */
567
/* Write the IHDR chunk, and update the png_struct with the necessary
570
PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
572
int bit_depth, int color_type, int compression_method, int filter_method,
573
int interlace_method));
575
PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr,
576
png_const_colorp palette, png_uint_32 num_pal));
578
PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
581
PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
583
#ifdef PNG_WRITE_gAMA_SUPPORTED
584
# ifdef PNG_FLOATING_POINT_SUPPORTED
585
PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
587
# ifdef PNG_FIXED_POINT_SUPPORTED
588
PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr,
589
png_fixed_point file_gamma));
593
#ifdef PNG_WRITE_sBIT_SUPPORTED
594
PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr,
595
png_const_color_8p sbit, int color_type));
598
#ifdef PNG_WRITE_cHRM_SUPPORTED
599
# ifdef PNG_FLOATING_POINT_SUPPORTED
600
PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
601
double white_x, double white_y,
602
double red_x, double red_y, double green_x, double green_y,
603
double blue_x, double blue_y));
605
PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
606
png_fixed_point int_white_x, png_fixed_point int_white_y,
607
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
608
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
609
png_fixed_point int_blue_y));
612
#ifdef PNG_WRITE_sRGB_SUPPORTED
613
PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
617
#ifdef PNG_WRITE_iCCP_SUPPORTED
618
PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
619
png_const_charp name, int compression_type,
620
png_const_charp profile, int proflen));
621
/* Note to maintainer: profile should be png_bytep */
624
#ifdef PNG_WRITE_sPLT_SUPPORTED
625
PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
626
png_const_sPLT_tp palette));
629
#ifdef PNG_WRITE_tRNS_SUPPORTED
630
PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr,
631
png_const_bytep trans, png_const_color_16p values, int number,
635
#ifdef PNG_WRITE_bKGD_SUPPORTED
636
PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
637
png_const_color_16p values, int color_type));
640
#ifdef PNG_WRITE_hIST_SUPPORTED
641
PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr,
642
png_const_uint_16p hist, int num_hist));
645
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
646
defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
647
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
648
png_const_charp key, png_charpp new_key));
651
#ifdef PNG_WRITE_tEXt_SUPPORTED
652
PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_const_charp key,
653
png_const_charp text, png_size_t text_len));
656
#ifdef PNG_WRITE_zTXt_SUPPORTED
657
PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_const_charp key,
658
png_const_charp text, png_size_t text_len, int compression));
661
#ifdef PNG_WRITE_iTXt_SUPPORTED
662
PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
663
int compression, png_const_charp key, png_const_charp lang,
664
png_const_charp lang_key, png_const_charp text));
667
#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
668
PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
669
png_infop info_ptr, png_const_textp text_ptr, int num_text));
672
#ifdef PNG_WRITE_oFFs_SUPPORTED
673
PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
674
png_int_32 x_offset, png_int_32 y_offset, int unit_type));
677
#ifdef PNG_WRITE_pCAL_SUPPORTED
678
PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
679
png_int_32 X0, png_int_32 X1, int type, int nparams,
680
png_const_charp units, png_charpp params));
683
#ifdef PNG_WRITE_pHYs_SUPPORTED
684
PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
685
png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
689
#ifdef PNG_WRITE_tIME_SUPPORTED
690
PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
691
png_const_timep mod_time));
694
#ifdef PNG_WRITE_sCAL_SUPPORTED
695
PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
696
int unit, png_const_charp width, png_const_charp height));
699
/* Called when finished processing a row of data */
700
PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
702
/* Internal use only. Called before first row of data */
703
PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
705
/* Combine a row of data, dealing with alpha, etc. if requested */
706
PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
709
#ifdef PNG_READ_INTERLACING_SUPPORTED
710
/* Expand an interlaced row */
711
/* OLD pre-1.0.9 interface:
712
PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
713
png_bytep row, int pass, png_uint_32 transformations));
715
PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
718
/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
720
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
721
/* Grab pixels out of a row for an interlaced pass */
722
PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
723
png_bytep row, int pass));
727
PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
728
png_row_infop row_info, png_bytep row, png_const_bytep prev_row,
731
/* Choose the best filter to use and filter the row data */
732
PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
733
png_row_infop row_info));
735
/* Write out the filtered row. */
736
PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
737
png_bytep filtered_row));
738
/* Finish a row while reading, dealing with interlacing passes, etc. */
739
PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
741
/* Initialize the row buffers, etc. */
742
PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
743
/* Optional call to update the users info structure */
744
PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
745
png_infop info_ptr));
747
/* These are the functions that do the transformations */
748
#ifdef PNG_READ_FILLER_SUPPORTED
749
PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
750
png_bytep row, png_uint_32 filler, png_uint_32 flags));
753
#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
754
PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
758
#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
759
PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
763
#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
764
PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
768
#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
769
PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
773
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
774
defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
775
PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
776
png_bytep row, png_uint_32 flags));
779
#ifdef PNG_16BIT_SUPPORTED
780
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
781
PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info,
786
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
787
defined(PNG_WRITE_PACKSWAP_SUPPORTED)
788
PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info,
792
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
793
PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr,
794
png_row_infop row_info, png_bytep row));
797
#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
798
PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
802
#ifdef PNG_READ_PACK_SUPPORTED
803
PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info,
807
#ifdef PNG_READ_SHIFT_SUPPORTED
808
PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info,
809
png_bytep row, png_const_color_8p sig_bits));
812
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
813
PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info,
817
#ifdef PNG_READ_16_TO_8_SUPPORTED
818
PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info,
822
#ifdef PNG_READ_QUANTIZE_SUPPORTED
823
PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info,
824
png_bytep row, png_const_bytep palette_lookup,
825
png_const_bytep quantize_lookup));
827
# ifdef PNG_CORRECT_PALETTE_SUPPORTED
828
PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
829
png_colorp palette, int num_palette));
833
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
834
PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info,
838
#ifdef PNG_WRITE_PACK_SUPPORTED
839
PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
840
png_bytep row, png_uint_32 bit_depth));
843
#ifdef PNG_WRITE_SHIFT_SUPPORTED
844
PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info,
845
png_bytep row, png_const_color_8p bit_depth));
848
#ifdef PNG_READ_BACKGROUND_SUPPORTED
849
# ifdef PNG_READ_GAMMA_SUPPORTED
850
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info,
851
png_bytep row, png_const_color_16p trans_color,
852
png_const_color_16p background, png_const_color_16p background_1,
853
png_const_bytep gamma_table, png_const_bytep gamma_from_1,
854
png_const_bytep gamma_to_1, png_const_uint_16pp gamma_16,
855
png_const_uint_16pp gamma_16_from_1, png_const_uint_16pp gamma_16_to_1,
858
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info,
859
png_bytep row, png_const_color_16p trans_color,
860
png_const_color_16p background));
864
#ifdef PNG_READ_GAMMA_SUPPORTED
865
PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info,
866
png_bytep row, png_const_bytep gamma_table,
867
png_const_uint_16pp gamma_16_table, int gamma_shift));
870
#ifdef PNG_READ_EXPAND_SUPPORTED
871
PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
872
png_bytep row, png_const_colorp palette, png_const_bytep trans,
874
PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
875
png_bytep row, png_const_color_16p trans_color));
878
/* The following decodes the appropriate chunks, and does error correction,
879
* then calls the appropriate callback for the chunk if it is valid.
882
/* Decode the IHDR chunk */
883
PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
884
png_uint_32 length));
885
PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
886
png_uint_32 length));
887
PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
888
png_uint_32 length));
890
#ifdef PNG_READ_bKGD_SUPPORTED
891
PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
892
png_uint_32 length));
895
#ifdef PNG_READ_cHRM_SUPPORTED
896
PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
897
png_uint_32 length));
900
#ifdef PNG_READ_gAMA_SUPPORTED
901
PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
902
png_uint_32 length));
905
#ifdef PNG_READ_hIST_SUPPORTED
906
PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
907
png_uint_32 length));
910
#ifdef PNG_READ_iCCP_SUPPORTED
911
PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
912
png_uint_32 length));
913
#endif /* PNG_READ_iCCP_SUPPORTED */
915
#ifdef PNG_READ_iTXt_SUPPORTED
916
PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
917
png_uint_32 length));
920
#ifdef PNG_READ_oFFs_SUPPORTED
921
PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
922
png_uint_32 length));
925
#ifdef PNG_READ_pCAL_SUPPORTED
926
PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
927
png_uint_32 length));
930
#ifdef PNG_READ_pHYs_SUPPORTED
931
PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
932
png_uint_32 length));
935
#ifdef PNG_READ_sBIT_SUPPORTED
936
PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
937
png_uint_32 length));
940
#ifdef PNG_READ_sCAL_SUPPORTED
941
PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
942
png_uint_32 length));
945
#ifdef PNG_READ_sPLT_SUPPORTED
946
PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
947
png_uint_32 length));
948
#endif /* PNG_READ_sPLT_SUPPORTED */
950
#ifdef PNG_READ_sRGB_SUPPORTED
951
PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
952
png_uint_32 length));
955
#ifdef PNG_READ_tEXt_SUPPORTED
956
PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
957
png_uint_32 length));
960
#ifdef PNG_READ_tIME_SUPPORTED
961
PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
962
png_uint_32 length));
965
#ifdef PNG_READ_tRNS_SUPPORTED
966
PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
967
png_uint_32 length));
970
#ifdef PNG_READ_zTXt_SUPPORTED
971
PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
972
png_uint_32 length));
975
PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
976
png_infop info_ptr, png_uint_32 length));
978
PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
979
png_const_bytep chunk_name));
981
/* Handle the transformations for reading and writing */
982
PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
983
PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
985
PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
987
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
988
PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
989
png_infop info_ptr));
990
PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
991
png_infop info_ptr));
992
PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
993
PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
994
png_uint_32 length));
995
PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
996
PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
997
PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
998
png_bytep buffer, png_size_t buffer_length));
999
PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
1000
PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
1001
png_bytep buffer, png_size_t buffer_length));
1002
PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
1003
PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
1004
png_infop info_ptr, png_uint_32 length));
1005
PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
1006
png_infop info_ptr));
1007
PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
1008
png_infop info_ptr));
1009
PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
1010
PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
1011
png_infop info_ptr));
1012
PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
1013
png_infop info_ptr));
1014
PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
1015
# ifdef PNG_READ_tEXt_SUPPORTED
1016
PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
1017
png_infop info_ptr, png_uint_32 length));
1018
PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
1019
png_infop info_ptr));
1021
# ifdef PNG_READ_zTXt_SUPPORTED
1022
PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
1023
png_infop info_ptr, png_uint_32 length));
1024
PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
1025
png_infop info_ptr));
1027
# ifdef PNG_READ_iTXt_SUPPORTED
1028
PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
1029
png_infop info_ptr, png_uint_32 length));
1030
PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
1031
png_infop info_ptr));
1034
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1036
#ifdef PNG_MNG_FEATURES_SUPPORTED
1037
PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
1039
PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
1043
/* Added at libpng version 1.4.0 */
1044
#ifdef PNG_CHECK_cHRM_SUPPORTED
1045
PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
1046
png_fixed_point int_white_x, png_fixed_point int_white_y,
1047
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
1048
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
1049
png_fixed_point int_blue_y));
1052
#ifdef PNG_CHECK_cHRM_SUPPORTED
1053
/* Added at libpng version 1.2.34 and 1.4.0 */
1054
/* Currently only used by png_check_cHRM_fixed */
1055
PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,
1056
unsigned long *hi_product, unsigned long *lo_product));
1059
/* Added at libpng version 1.4.0 */
1060
PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
1061
png_uint_32 width, png_uint_32 height, int bit_depth,
1062
int color_type, int interlace_type, int compression_type,
1065
/* Free all memory used by the read (old method - NOT DLL EXPORTED) */
1066
PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr,
1067
png_infop info_ptr, png_infop end_info_ptr));
1069
/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1070
PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr));
1072
#ifdef USE_FAR_KEYWORD /* memory model conversion function */
1073
PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr, png_voidp ptr,
1075
#endif /* USE_FAR_KEYWORD */
1077
#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
1078
PNG_EXTERN PNG_FUNCTION(void, png_fixed_error, (png_structp png_ptr,
1079
png_const_charp name),PNG_NORETURN);
1082
/* ASCII to FP interfaces, currently only implemented if sCAL
1083
* support is required.
1085
#if defined(PNG_READ_sCAL_SUPPORTED)
1086
/* MAX_DIGITS is actually the maximum number of characters in an sCAL
1087
* width or height, derived from the precision (number of significant
1088
* digits - a build time settable option) and assumpitions about the
1089
* maximum ridiculous exponent.
1091
#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
1093
#ifdef PNG_FLOATING_POINT_SUPPORTED
1094
PNG_EXTERN void png_ascii_from_fp PNGARG((png_structp png_ptr, png_charp ascii,
1095
png_size_t size, double fp, unsigned int precision));
1096
#endif /* FLOATING_POINT */
1098
#ifdef PNG_FIXED_POINT_SUPPORTED
1099
PNG_EXTERN void png_ascii_from_fixed PNGARG((png_structp png_ptr,
1100
png_charp ascii, png_size_t size, png_fixed_point fp));
1101
#endif /* FIXED_POINT */
1102
#endif /* READ_sCAL */
1104
#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1105
/* An internal API to validate the format of a floating point number.
1106
* The result is the index of the next character. If the number is
1107
* not valid it will be the index of a character in the supposed number.
1109
* The format of a number is defined in the PNG extensions specification
1110
* and this API is strictly conformant to that spec, not anyone elses!
1112
* The format as a regular expression is:
1114
* [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1118
* [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1120
* The complexity is that either integer or fraction must be present and the
1121
* fraction is permitted to have no digits only if the integer is present.
1123
* NOTE: The dangling E problem.
1124
* There is a PNG valid floating point number in the following:
1126
* PNG floating point numb1.ers are not greedy.
1128
* Working this out requires *TWO* character lookahead (because of the
1129
* sign), the parser does not do this - it will fail at the 'r' - this
1130
* doesn't matter for PNG sCAL chunk values, but it requires more care
1131
* if the value were ever to be embedded in something more complex. Use
1132
* ANSI-C strtod if you need the lookahead.
1134
/* State table for the parser. */
1135
#define PNG_FP_INTEGER 0 /* before or in integer */
1136
#define PNG_FP_FRACTION 1 /* before or in fraction */
1137
#define PNG_FP_EXPONENT 2 /* before or in exponent */
1138
#define PNG_FP_STATE 3 /* mask for the above */
1139
#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1140
#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1141
#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1142
#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1143
#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
1144
#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
1145
#define PNG_FP_INVALID 128 /* Available for callers as a distinct value */
1147
/* Result codes for the parser (boolean - true meants ok, false means
1150
#define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1151
#define PNG_FP_OK 1 /* The number is valid */
1153
/* The actual parser. This can be called repeatedly, it updates
1154
* the index into the string and the state variable (which must
1155
* be initialzed to 0). It returns a result code, as above. There
1156
* is no point calling the parser any more if it fails to advance to
1157
* the end of the string - it is stuck on an invalid character (or
1158
* terminated by '\0').
1160
* Note that the pointer will consume an E or even an E+ then leave
1161
* a 'maybe' state even though a preceding integer.fraction is valid.
1162
* The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1163
* a valid number. It's possible to recover from this by calling
1164
* the parser again (from the start, with state 0) but with a string
1165
* that omits the last character (i.e. set the size to the index of
1166
* the problem character.) This has not been tested within libpng.
1168
PNG_EXTERN int png_check_fp_number PNGARG((png_const_charp string,
1169
png_size_t size, int *statep, png_size_tp whereami));
1171
/* This is the same but it checks a complete string and returns true
1172
* only if it just contains a floating point number.
1174
PNG_EXTERN int png_check_fp_string PNGARG((png_const_charp string,
1176
#endif /* pCAL || sCAL */
1178
#if defined(PNG_READ_GAMMA_SUPPORTED) ||\
1179
defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
1180
/* Added at libpng version 1.5.0 */
1181
/* This is a utility to provide a*times/div (rounded) and indicate
1182
* if there is an overflow. The result is a boolean - false (0)
1183
* for overflow, true (1) if no overflow, in which case *res
1186
PNG_EXTERN int png_muldiv PNGARG((png_fixed_point_p res, png_fixed_point a,
1187
png_int_32 times, png_int_32 div));
1190
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
1191
/* Same deal, but issue a warning on overflow and return 0. */
1192
PNG_EXTERN png_fixed_point png_muldiv_warn PNGARG((png_structp png_ptr,
1193
png_fixed_point a, png_int_32 times, png_int_32 div));
1196
#ifdef PNG_READ_GAMMA_SUPPORTED
1197
/* Calculate a reciprocal - used for gamma values. This returns
1198
* 0 if the argument is 0 in order to maintain an undefined value,
1199
* there are no warnings.
1201
PNG_EXTERN png_fixed_point png_reciprocal PNGARG((png_fixed_point a));
1203
/* The same but gives a reciprocal of the product of two fixed point
1204
* values. Accuracy is suitable for gamma calculations but this is
1205
* not exact - use png_muldiv for that.
1207
PNG_EXTERN png_fixed_point png_reciprocal2 PNGARG((png_fixed_point a,
1208
png_fixed_point b));
1211
#ifdef PNG_READ_GAMMA_SUPPORTED
1212
/* Internal fixed point gamma correction. These APIs are called as
1213
* required to convert single values - they don't need to be fast,
1214
* they are not used when processing image pixel values.
1216
* While the input is an 'unsigned' value it must actually be the
1217
* correct bit value - 0..255 or 0..65535 as required.
1219
PNG_EXTERN png_uint_16 png_gamma_correct PNGARG((png_structp png_ptr,
1220
unsigned int value, png_fixed_point gamma));
1221
PNG_EXTERN int png_gamma_significant PNGARG((png_fixed_point gamma));
1222
PNG_EXTERN png_uint_16 png_gamma_16bit_correct PNGARG((unsigned int value,
1223
png_fixed_point gamma));
1224
PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned int value,
1225
png_fixed_point gamma));
1226
PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
1230
/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
1233
#include "pngdebug.h"
1239
#endif /* PNGPRIV_H */
added
removed
Externals/libpng/pngpriv.h
