31aee0d0c0
Fixed point APIs are now supported throughout (no missing APIs).
Internal fixed point arithmetic support exists for all internal floating
point operations.
sCAL validates the floating point strings it is passed.
Safe, albeit rudimentary, Watcom support is provided by PNG_API_RULE==2
Two new APIs exist to get the number of passes without turning on the
PNG_INTERLACE transform and to get the number of rows in the current
pass.
A new test program, pngvalid.c, validates the gamma code.
Errors in the 16 bit gamma correction (overflows) have been corrected.
cHRM chunk testing is done consistently (previously the floating point
API bypassed it, because the test really didn't work on FP, now the test
is performed on the actual values to be stored in the PNG file so it
works in the FP case too.)
Most floating point APIs now simply call the fixed point APIs after
converting the values to the fixed point form used in the PNG file.
The standard headers no longer include zlib.h, which is currently only
required for pngstruct.h and can therefore be internal.
(Patches by John Bowler)
1183 lines
44 KiB
C
1183 lines
44 KiB
C
|
|
/* pngpriv.h - private declarations for use inside libpng
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*
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* libpng version 1.5.0beta36 - July 29, 2010
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* For conditions of distribution and use, see copyright notice in png.h
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* Copyright (c) 1998-2010 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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*
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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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*/
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/* The symbols declared in this file (including the functions declared
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* as PNG_EXTERN) are PRIVATE. They are not part of the libpng public
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* 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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*/
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#ifndef PNGPRIV_H
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#define PNGPRIV_H
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#define PNGLIB_BUILD
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#ifdef PNG_USER_CONFIG
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# include "pngusr.h"
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#endif
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#include "png.h"
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#include "pnginfo.h"
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#include "pngstruct.h"
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/* This is required for the definition of abort(), used as a last ditch
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* error handler when all else fails.
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*/
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#include <stdlib.h>
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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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* like limits.
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*/
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#ifdef PNG_CONFIGURE_LIBPNG
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# ifdef HAVE_CONFIG_H
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# include "config.h"
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# endif
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#endif
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|
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/* Moved to pngpriv.h at libpng-1.5.0 */
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/* NOTE: some of these may be used in external applications as these definitions
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* were exposed in pngconf.h prior to 1.5.
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*/
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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
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* normally need that much memory in a chunk (unless you load up a very
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* 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
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* will fit into memory.
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*
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* zlib provides 'MAXSEG_64K' which, if defined, indicates the
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* same limit and pngconf.h (already included) sets the limit
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* if certain operating systems are detected.
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*/
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#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
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# define PNG_MAX_MALLOC_64K
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#endif
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/* Just a little check that someone hasn't tried to define something
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* contradictory.
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*/
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#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
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# undef PNG_ZBUF_SIZE
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# define PNG_ZBUF_SIZE 65536L
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#endif
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/* If warnings or errors are turned off the code is disabled
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* or redirected here.
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*/
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#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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#endif
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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,s3) png_err(s1)
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#endif
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#ifndef PNG_EXTERN
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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
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* 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 will be made available again.
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# define PNG_EXTERN extern
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*/
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# define PNG_EXTERN
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#endif
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|
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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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* deals with this:
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*/
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#ifdef PNG_FIXED_POINT_SUPPORTED
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# define PNGFAPI PNGAPI
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#else
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# define PNGFAPI /* PRIVATE */
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#endif
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|
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/* Other defines specific to compilers can go here. Try to keep
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* them inside an appropriate ifdef/endif pair for portability.
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*/
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#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
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defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
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/* pngarith.c requires the following ANSI-C constants if the convertion of
|
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* floating point to ASCII is implemented therein:
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*
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* DBL_DIG Maximum number of decimal digits (can be set to any constant)
|
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* DBL_MIN Smalles normalized fp number (can be set to an arbitrary value)
|
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* DBL_MAX Maximum floating point number (can be set to an arbitrary value)
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*/
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# include <float.h>
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|
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# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
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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
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* as it seems it doesn't agree with <fp.h>, yet we should really use
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* <fp.h> if possible.
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*/
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# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
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# include <fp.h>
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# endif
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# else
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# include <math.h>
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# endif
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# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
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/* Amiga SAS/C: We must include builtin FPU functions when compiling using
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* MATH=68881
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*/
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# include <m68881.h>
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# endif
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#endif
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|
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/* This provides the non-ANSI (far) memory allocation routines. */
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#if defined(__TURBOC__) && defined(__MSDOS__)
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# include <mem.h>
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# include <alloc.h>
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#endif
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|
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#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
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defined(_WIN32) || defined(__WIN32__)
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# include <windows.h> /* defines _WINDOWS_ macro */
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/* I have no idea why is this necessary... */
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# ifdef _MSC_VER
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# include <malloc.h>
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# endif
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#endif
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|
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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
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* functions that are passed far data must be model-independent.
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*/
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/* Memory model/platform independent fns */
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#ifndef PNG_ABORT
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# ifdef _WINDOWS_
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# define PNG_ABORT() ExitProcess(0)
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# else
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# define PNG_ABORT() abort()
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# endif
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#endif
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#ifdef USE_FAR_KEYWORD
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/* Use this to make far-to-near assignments */
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# define CHECK 1
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# define NOCHECK 0
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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 */
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# define png_strlen _fstrlen
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# define png_memcmp _fmemcmp /* SJT: added */
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# define png_memcpy _fmemcpy
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# define png_memset _fmemset
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# define png_sprintf sprintf
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#else
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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
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# define png_strncpy lstrcpynA
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# 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
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# else
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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 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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# endif
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#endif
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/* End of memory model/platform independent support */
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#ifndef PNG_NO_SNPRINTF
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# ifdef _MSC_VER
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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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# else
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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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# endif
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#else
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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
|
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* 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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* Portable OpenSSH).
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*/
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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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#endif
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/* End of 1.5.0beta36 move from pngconf.h */
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|
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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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*/
|
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/* Various modes of operation. Note that after an init, mode is set to
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* zero automatically when the structure is created.
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*/
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#define PNG_HAVE_IHDR 0x01
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#define PNG_HAVE_PLTE 0x02
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#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
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#define PNG_HAVE_CHUNK_HEADER 0x100
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#define PNG_WROTE_tIME 0x200
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#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
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#define PNG_BACKGROUND_IS_GRAY 0x800
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#define PNG_HAVE_PNG_SIGNATURE 0x1000
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#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
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|
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/* Flags for the transformations the PNG library does on the image data */
|
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#define PNG_BGR 0x0001
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#define PNG_INTERLACE 0x0002
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#define PNG_PACK 0x0004
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#define PNG_SHIFT 0x0008
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#define PNG_SWAP_BYTES 0x0010
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#define PNG_INVERT_MONO 0x0020
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#define PNG_QUANTIZE 0x0040
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#define PNG_BACKGROUND 0x0080
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#define PNG_BACKGROUND_EXPAND 0x0100
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/* 0x0200 unused */
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#define PNG_16_TO_8 0x0400
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#define PNG_RGBA 0x0800
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#define PNG_EXPAND 0x1000
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#define PNG_GAMMA 0x2000
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#define PNG_GRAY_TO_RGB 0x4000
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#define PNG_FILLER 0x8000L
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#define PNG_PACKSWAP 0x10000L
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#define PNG_SWAP_ALPHA 0x20000L
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#define PNG_STRIP_ALPHA 0x40000L
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#define PNG_INVERT_ALPHA 0x80000L
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#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
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#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
|
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/* 0x800000L Unused */
|
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#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
|
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#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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|
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/* Flags for png_create_struct */
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#define PNG_STRUCT_PNG 0x0001
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#define PNG_STRUCT_INFO 0x0002
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|
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/* Scaling factor for filter heuristic weighting calculations */
|
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#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
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#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
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|
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/* Flags for the png_ptr->flags rather than declaring a byte for each one */
|
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#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
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#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
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#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
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#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
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#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
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#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
|
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/* 0x1000 unused */
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/* 0x2000 unused */
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/* 0x4000 unused */
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#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
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#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
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#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
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#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
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#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
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#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
|
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#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
|
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#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
|
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#define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000L /* Added to libpng-1.4.0 */
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/* 0x1000000L unused */
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/* 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 */
|
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|
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#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
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PNG_FLAG_CRC_ANCILLARY_NOWARN)
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|
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#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
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PNG_FLAG_CRC_CRITICAL_IGNORE)
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|
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#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
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PNG_FLAG_CRC_CRITICAL_MASK)
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|
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/* Save typing and make code easier to understand */
|
|
|
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#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
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abs((int)((c1).green) - (int)((c2).green)) + \
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abs((int)((c1).blue) - (int)((c2).blue)))
|
|
|
|
/* Added to libpng-1.2.6 JB */
|
|
#define PNG_ROWBYTES(pixel_bits, width) \
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((pixel_bits) >= 8 ? \
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((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
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(( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
|
|
|
|
/* PNG_OUT_OF_RANGE returns true if value is outside the range
|
|
* ideal-delta..ideal+delta. Each argument is evaluated twice.
|
|
* "ideal" and "delta" should be constants, normally simple
|
|
* integers, "value" a variable. Added to libpng-1.2.6 JB
|
|
*/
|
|
#define PNG_OUT_OF_RANGE(value, ideal, delta) \
|
|
( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
|
|
|
|
/* Convertions between fixed and floating point, only defined if
|
|
* required (to make sure the code doesn't accidentally use float
|
|
* when it is supposedly disabled.)
|
|
*/
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
/* The floating point convertion can't overflow, though it can and
|
|
* does lose accuracy relative to the original fixed point value.
|
|
* In practice this doesn't matter because png_fixed_point only
|
|
* stores numbers with very low precision. The png_ptr and s
|
|
* arguments are unused by default but are there in case error
|
|
* checking becomes a requirement.
|
|
*/
|
|
#define png_float(png_ptr, fixed, s) (.00001 * (fixed))
|
|
|
|
/* The fixed point convertion performs range checking and evaluates
|
|
* its argument multiple times, so must be used with care. The
|
|
* range checking uses the PNG specification values for a signed
|
|
* 32 bit fixed point value except that the values are deliberately
|
|
* rounded-to-zero to an integral value - 21474. 's' is a string
|
|
* that describes the value being converted.
|
|
*
|
|
* NOTE: this macro will raise a png_error if the range check fails,
|
|
* therefore it is normally only appropriate to use this on values
|
|
* that come from API calls or other sources where an out of range
|
|
* error indicates a programming error, not a data error!
|
|
*
|
|
* NOTE: by default this is off - the macro is not used - because the
|
|
* function call saves a lot of code.
|
|
*/
|
|
#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
|
|
#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
|
|
((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s, fp),0))
|
|
#else
|
|
PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp,
|
|
png_const_charp text));
|
|
#endif
|
|
#endif
|
|
|
|
/* Constant strings for known chunk types. If you need to add a chunk,
|
|
* define the name here, and add an invocation of the macro wherever it's
|
|
* needed.
|
|
*/
|
|
#define PNG_IHDR PNG_CONST png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
|
|
#define PNG_IDAT PNG_CONST png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
|
|
#define PNG_IEND PNG_CONST png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
|
|
#define PNG_PLTE PNG_CONST png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
|
|
#define PNG_bKGD PNG_CONST png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
|
|
#define PNG_cHRM PNG_CONST png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
|
|
#define PNG_gAMA PNG_CONST png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
|
|
#define PNG_hIST PNG_CONST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
|
|
#define PNG_iCCP PNG_CONST png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
|
|
#define PNG_iTXt PNG_CONST png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
|
|
#define PNG_oFFs PNG_CONST png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
|
|
#define PNG_pCAL PNG_CONST png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
|
|
#define PNG_sCAL PNG_CONST png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
|
|
#define PNG_pHYs PNG_CONST png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
|
|
#define PNG_sBIT PNG_CONST png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
|
|
#define PNG_sPLT PNG_CONST png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
|
|
#define PNG_sRGB PNG_CONST png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
|
|
#define PNG_sTER PNG_CONST png_byte png_sTER[5] = {115, 84, 69, 82, '\0'}
|
|
#define PNG_tEXt PNG_CONST png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
|
|
#define PNG_tIME PNG_CONST png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
|
|
#define PNG_tRNS PNG_CONST png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
|
|
#define PNG_zTXt PNG_CONST png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
|
|
|
|
|
|
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif /* __cplusplus */
|
|
|
|
/* These functions are used internally in the code. They generally
|
|
* shouldn't be used unless you are writing code to add or replace some
|
|
* functionality in libpng. More information about most functions can
|
|
* be found in the files where the functions are located.
|
|
*/
|
|
|
|
/* Allocate memory for an internal libpng struct */
|
|
PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
|
|
|
|
/* Free memory from internal libpng struct */
|
|
PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
|
|
|
|
PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
|
|
malloc_fn, png_voidp mem_ptr));
|
|
PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
|
|
png_free_ptr free_fn, png_voidp mem_ptr));
|
|
|
|
/* Free any memory that info_ptr points to and reset struct. */
|
|
PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
/* Function to allocate memory for zlib. PNGAPI is disallowed. */
|
|
PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
|
|
|
|
/* Function to free memory for zlib. PNGAPI is disallowed. */
|
|
PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
|
|
|
|
/* Next four functions are used internally as callbacks. PNGCBAPI is required
|
|
* but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
|
|
* PNGCBAPI at 1.5.0
|
|
*/
|
|
|
|
PNG_EXTERN void PNGCBAPI png_default_read_data PNGARG((png_structp png_ptr,
|
|
png_bytep data, png_size_t length));
|
|
|
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
PNG_EXTERN void PNGCBAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
|
|
png_bytep buffer, png_size_t length));
|
|
#endif
|
|
|
|
PNG_EXTERN void PNGCBAPI png_default_write_data PNGARG((png_structp png_ptr,
|
|
png_bytep data, png_size_t length));
|
|
|
|
#ifdef PNG_WRITE_FLUSH_SUPPORTED
|
|
# ifdef PNG_STDIO_SUPPORTED
|
|
PNG_EXTERN void PNGCBAPI png_default_flush PNGARG((png_structp png_ptr));
|
|
# endif
|
|
#endif
|
|
|
|
/* Reset the CRC variable */
|
|
PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
|
|
|
|
/* Write the "data" buffer to whatever output you are using */
|
|
PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
|
|
png_size_t length));
|
|
|
|
/* Read the chunk header (length + type name) */
|
|
PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
|
|
|
|
/* Read data from whatever input you are using into the "data" buffer */
|
|
PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
|
|
png_size_t length));
|
|
|
|
/* Read bytes into buf, and update png_ptr->crc */
|
|
PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
|
|
png_size_t length));
|
|
|
|
/* Decompress data in a chunk that uses compression */
|
|
#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
|
|
defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
|
|
PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
|
|
int comp_type, png_size_t chunklength, png_size_t prefix_length,
|
|
png_size_t *data_length));
|
|
#endif
|
|
|
|
/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
|
|
PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
|
|
|
|
/* Read the CRC from the file and compare it to the libpng calculated CRC */
|
|
PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
|
|
|
|
/* Calculate the CRC over a section of data. Note that we are only
|
|
* passing a maximum of 64K on systems that have this as a memory limit,
|
|
* since this is the maximum buffer size we can specify.
|
|
*/
|
|
PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
|
|
png_size_t length));
|
|
|
|
#ifdef PNG_WRITE_FLUSH_SUPPORTED
|
|
PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
/* Write various chunks */
|
|
|
|
/* Write the IHDR chunk, and update the png_struct with the necessary
|
|
* information.
|
|
*/
|
|
PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
|
|
png_uint_32 height,
|
|
int bit_depth, int color_type, int compression_method, int filter_method,
|
|
int interlace_method));
|
|
|
|
PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
|
|
png_uint_32 num_pal));
|
|
|
|
PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
|
|
png_size_t length));
|
|
|
|
PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
|
|
|
|
#ifdef PNG_WRITE_gAMA_SUPPORTED
|
|
# ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
|
|
# endif
|
|
# ifdef PNG_FIXED_POINT_SUPPORTED
|
|
PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr,
|
|
png_fixed_point file_gamma));
|
|
# endif
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_sBIT_SUPPORTED
|
|
PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
|
|
int color_type));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_cHRM_SUPPORTED
|
|
# ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
|
|
double white_x, double white_y,
|
|
double red_x, double red_y, double green_x, double green_y,
|
|
double blue_x, double blue_y));
|
|
# endif
|
|
PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
|
|
png_fixed_point int_white_x, png_fixed_point int_white_y,
|
|
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
|
|
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
|
|
png_fixed_point int_blue_y));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_sRGB_SUPPORTED
|
|
PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
|
|
int intent));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_iCCP_SUPPORTED
|
|
PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
|
|
png_charp name, int compression_type,
|
|
png_charp profile, int proflen));
|
|
/* Note to maintainer: profile should be png_bytep */
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_sPLT_SUPPORTED
|
|
PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
|
|
png_sPLT_tp palette));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_tRNS_SUPPORTED
|
|
PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
|
|
png_color_16p values, int number, int color_type));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_bKGD_SUPPORTED
|
|
PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
|
|
png_color_16p values, int color_type));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_hIST_SUPPORTED
|
|
PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
|
|
int num_hist));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
|
|
defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
|
|
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
|
|
png_charp key, png_charpp new_key));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_tEXt_SUPPORTED
|
|
PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
|
|
png_charp text, png_size_t text_len));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_zTXt_SUPPORTED
|
|
PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
|
|
png_charp text, png_size_t text_len, int compression));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_iTXt_SUPPORTED
|
|
PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
|
|
int compression, png_charp key, png_charp lang, png_charp lang_key,
|
|
png_charp text));
|
|
#endif
|
|
|
|
#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
|
|
PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_textp text_ptr, int num_text));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_oFFs_SUPPORTED
|
|
PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
|
|
png_int_32 x_offset, png_int_32 y_offset, int unit_type));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_pCAL_SUPPORTED
|
|
PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
|
|
png_int_32 X0, png_int_32 X1, int type, int nparams,
|
|
png_charp units, png_charpp params));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_pHYs_SUPPORTED
|
|
PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
|
|
png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
|
|
int unit_type));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_tIME_SUPPORTED
|
|
PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
|
|
png_timep mod_time));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_sCAL_SUPPORTED
|
|
PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
|
|
int unit, png_charp width, png_charp height));
|
|
#endif
|
|
|
|
/* Called when finished processing a row of data */
|
|
PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
|
|
|
|
/* Internal use only. Called before first row of data */
|
|
PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
|
|
|
|
#ifdef PNG_READ_GAMMA_SUPPORTED
|
|
PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
|
|
png_byte bit_depth));
|
|
#endif
|
|
|
|
/* Combine a row of data, dealing with alpha, etc. if requested */
|
|
PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
|
|
int mask));
|
|
|
|
#ifdef PNG_READ_INTERLACING_SUPPORTED
|
|
/* Expand an interlaced row */
|
|
/* OLD pre-1.0.9 interface:
|
|
PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
|
|
png_bytep row, int pass, png_uint_32 transformations));
|
|
*/
|
|
PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
|
|
|
|
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
|
|
/* Grab pixels out of a row for an interlaced pass */
|
|
PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
|
|
png_bytep row, int pass));
|
|
#endif
|
|
|
|
/* Unfilter a row */
|
|
PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
|
|
png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
|
|
|
|
/* Choose the best filter to use and filter the row data */
|
|
PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
|
|
png_row_infop row_info));
|
|
|
|
/* Write out the filtered row. */
|
|
PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
|
|
png_bytep filtered_row));
|
|
/* Finish a row while reading, dealing with interlacing passes, etc. */
|
|
PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
|
|
|
|
/* Initialize the row buffers, etc. */
|
|
PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
|
|
/* Optional call to update the users info structure */
|
|
PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
/* These are the functions that do the transformations */
|
|
#ifdef PNG_READ_FILLER_SUPPORTED
|
|
PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
|
|
png_bytep row, png_uint_32 filler, png_uint_32 flags));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
|
|
PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
|
|
png_bytep row));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
|
|
PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
|
|
png_bytep row));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
|
|
PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
|
|
png_bytep row));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
|
|
PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
|
|
png_bytep row));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
|
|
defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
|
|
PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
|
|
png_bytep row, png_uint_32 flags));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
|
|
PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
|
|
defined(PNG_WRITE_PACKSWAP_SUPPORTED)
|
|
PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
|
|
PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
|
|
row_info, png_bytep row));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
|
|
PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
|
|
png_bytep row));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_PACK_SUPPORTED
|
|
PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_SHIFT_SUPPORTED
|
|
PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
|
|
png_color_8p sig_bits));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
|
|
PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_16_TO_8_SUPPORTED
|
|
PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_QUANTIZE_SUPPORTED
|
|
PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info,
|
|
png_bytep row, png_bytep palette_lookup, png_bytep quantize_lookup));
|
|
|
|
# ifdef PNG_CORRECT_PALETTE_SUPPORTED
|
|
PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
|
|
png_colorp palette, int num_palette));
|
|
# endif
|
|
#endif
|
|
|
|
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
|
|
PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_PACK_SUPPORTED
|
|
PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
|
|
png_bytep row, png_uint_32 bit_depth));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_SHIFT_SUPPORTED
|
|
PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
|
|
png_color_8p bit_depth));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_BACKGROUND_SUPPORTED
|
|
# ifdef PNG_READ_GAMMA_SUPPORTED
|
|
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
|
|
png_color_16p trans_color, png_color_16p background,
|
|
png_color_16p background_1,
|
|
png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
|
|
png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
|
|
png_uint_16pp gamma_16_to_1, int gamma_shift));
|
|
# else
|
|
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
|
|
png_color_16p trans_color, png_color_16p background));
|
|
# endif
|
|
#endif
|
|
|
|
#ifdef PNG_READ_GAMMA_SUPPORTED
|
|
PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
|
|
png_bytep gamma_table, png_uint_16pp gamma_16_table,
|
|
int gamma_shift));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_EXPAND_SUPPORTED
|
|
PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
|
|
png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
|
|
PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
|
|
png_bytep row, png_color_16p trans_value));
|
|
#endif
|
|
|
|
/* The following decodes the appropriate chunks, and does error correction,
|
|
* then calls the appropriate callback for the chunk if it is valid.
|
|
*/
|
|
|
|
/* Decode the IHDR chunk */
|
|
PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
|
|
#ifdef PNG_READ_bKGD_SUPPORTED
|
|
PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_cHRM_SUPPORTED
|
|
PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_gAMA_SUPPORTED
|
|
PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_hIST_SUPPORTED
|
|
PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_iCCP_SUPPORTED
|
|
PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif /* PNG_READ_iCCP_SUPPORTED */
|
|
|
|
#ifdef PNG_READ_iTXt_SUPPORTED
|
|
PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_oFFs_SUPPORTED
|
|
PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_pCAL_SUPPORTED
|
|
PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_pHYs_SUPPORTED
|
|
PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_sBIT_SUPPORTED
|
|
PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_sCAL_SUPPORTED
|
|
PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_sPLT_SUPPORTED
|
|
PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif /* PNG_READ_sPLT_SUPPORTED */
|
|
|
|
#ifdef PNG_READ_sRGB_SUPPORTED
|
|
PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_tEXt_SUPPORTED
|
|
PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_tIME_SUPPORTED
|
|
PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_tRNS_SUPPORTED
|
|
PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_zTXt_SUPPORTED
|
|
PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_uint_32 length));
|
|
#endif
|
|
|
|
PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 length));
|
|
|
|
PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
|
|
png_bytep chunk_name));
|
|
|
|
/* Handle the transformations for reading and writing */
|
|
PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
|
|
PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
|
|
|
|
PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
|
|
|
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
|
|
PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
|
|
png_uint_32 length));
|
|
PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
|
|
PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
|
|
PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
|
|
png_bytep buffer, png_size_t buffer_length));
|
|
PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
|
|
PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
|
|
png_bytep buffer, png_size_t buffer_length));
|
|
PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
|
|
PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 length));
|
|
PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
|
|
PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
|
|
# ifdef PNG_READ_tEXt_SUPPORTED
|
|
PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 length));
|
|
PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
# endif
|
|
# ifdef PNG_READ_zTXt_SUPPORTED
|
|
PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 length));
|
|
PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
# endif
|
|
# ifdef PNG_READ_iTXt_SUPPORTED
|
|
PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 length));
|
|
PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
# endif
|
|
|
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|
|
|
#ifdef PNG_MNG_FEATURES_SUPPORTED
|
|
PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
|
|
png_bytep row));
|
|
PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
|
|
png_bytep row));
|
|
#endif
|
|
|
|
/* Added at libpng version 1.4.0 */
|
|
#ifdef PNG_CHECK_cHRM_SUPPORTED
|
|
PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
|
|
png_fixed_point int_white_x, png_fixed_point int_white_y,
|
|
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
|
|
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
|
|
png_fixed_point int_blue_y));
|
|
#endif
|
|
|
|
#ifdef PNG_CHECK_cHRM_SUPPORTED
|
|
/* Added at libpng version 1.2.34 and 1.4.0 */
|
|
/* Currently only used by png_check_cHRM_fixed */
|
|
PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,
|
|
unsigned long *hi_product, unsigned long *lo_product));
|
|
#endif
|
|
|
|
/* Added at libpng version 1.4.0 */
|
|
PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
|
|
png_uint_32 width, png_uint_32 height, int bit_depth,
|
|
int color_type, int interlace_type, int compression_type,
|
|
int filter_type));
|
|
|
|
/* Free all memory used by the read (old method - NOT DLL EXPORTED) */
|
|
PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_infop end_info_ptr));
|
|
|
|
/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
|
|
PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr));
|
|
|
|
#ifdef USE_FAR_KEYWORD /* memory model conversion function */
|
|
PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr, png_voidp ptr,
|
|
int check));
|
|
#endif /* USE_FAR_KEYWORD */
|
|
|
|
#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
|
|
PNG_EXTERN void png_fixed_error PNGARG((png_structp png_ptr,
|
|
png_const_charp name, double value));
|
|
#endif
|
|
|
|
/* ASCII to FP interfaces, currently only implemented if sCAL
|
|
* support is required.
|
|
*/
|
|
#if defined(PNG_READ_sCAL_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
|
|
/* MAX_DIGITS is actually the maximum number of characters in an sCAL
|
|
* width or height, derived from the precision (number of significant
|
|
* digits - a build time settable option) and assumpitions about the
|
|
* maximum ridiculous exponent.
|
|
*/
|
|
#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
|
|
PNG_EXTERN void png_ascii_from_fp(png_structp png_ptr, png_charp ascii,
|
|
png_size_t size, double fp, unsigned precision);
|
|
#endif /* READ_sCAL && FLOATING_POINT */
|
|
|
|
#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
|
|
/* An internal API to validate the format of a floating point number.
|
|
* The result is the index of the next character. If the number is
|
|
* not valid it will be the index of a character in the supposed number.
|
|
*
|
|
* The format of a number is defined in the PNG extensions specification
|
|
* and this API is strictly conformant to that spec, not anyone elses!
|
|
*
|
|
* The format as a regular expression is:
|
|
*
|
|
* [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
|
|
*
|
|
* or:
|
|
*
|
|
* [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
|
|
*
|
|
* The complexity is that either integer or fraction must be present and the
|
|
* fraction is permitted to have no digits only if the integer is present.
|
|
*
|
|
* NOTE: The dangling E problem.
|
|
* There is a PNG valid floating point number in the following:
|
|
*
|
|
* PNG floating point numb1.ers are not greedy.
|
|
*
|
|
* Working this out requires *TWO* character lookahead (because of the
|
|
* sign), the parser does not do this - it will fail at the 'r' - this
|
|
* doesn't matter for PNG sCAL chunk values, but it requires more care
|
|
* if the value were ever to be embedded in something more complex. Use
|
|
* ANSI-C strtod if you need the lookahead.
|
|
*/
|
|
/* State table for the parser. */
|
|
#define PNG_FP_INTEGER 0 /* before or in integer */
|
|
#define PNG_FP_FRACTION 1 /* before or in fraction */
|
|
#define PNG_FP_EXPONENT 2 /* before or in exponent */
|
|
#define PNG_FP_STATE 3 /* mask for the above */
|
|
#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
|
|
#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
|
|
#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
|
|
#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
|
|
#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
|
|
#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
|
|
#define PNG_FP_INVALID 128 /* Available for callers as a distinct value */
|
|
|
|
/* Result codes for the parser (boolean - true meants ok, false means
|
|
* not ok yet.)
|
|
*/
|
|
#define PNG_FP_MAYBE 0 /* The number may be valid in the future */
|
|
#define PNG_FP_OK 1 /* The number is valid */
|
|
|
|
/* The actual parser. This can be called repeatedly, it updates
|
|
* the index into the string and the state variable (which must
|
|
* be initialzed to 0). It returns a result code, as above. There
|
|
* is no point calling the parser any more if it fails to advance to
|
|
* the end of the string - it is stuck on an invalid character (or
|
|
* terminated by '\0').
|
|
*
|
|
* Note that the pointer will consume an E or even an E+ then leave
|
|
* a 'maybe' state even though a preceding integer.fraction is valid.
|
|
* The PNG_FP_WAS_VALID flag indicates that a preceding substring was
|
|
* a valid number. It's possible to recover from this by calling
|
|
* the parser again (from the start, with state 0) but with a string
|
|
* that omits the last character (i.e. set the size to the index of
|
|
* the problem character.) This has not been tested within libpng.
|
|
*/
|
|
PNG_EXTERN int png_check_fp_number(png_charp string, png_size_t size,
|
|
int *statep, png_size_tp whereami);
|
|
|
|
/* This is the same but it checks a complete string and returns true
|
|
* only if it just contains a floating point number.
|
|
*/
|
|
PNG_EXTERN int png_check_fp_string(png_charp string, png_size_t size);
|
|
#endif /* pCAL || sCAL */
|
|
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
|
|
/* Added at libpng version 1.5.0 */
|
|
/* This is a utility to provide a*times/div (rounded) and indicate
|
|
* if there is an overflow. The result is a boolean - false (0)
|
|
* for overflow, true (1) if no overflow, in which case *res
|
|
* holds the result.
|
|
*/
|
|
PNG_EXTERN int png_muldiv PNGARG((png_fixed_point_p res, png_fixed_point a,
|
|
png_int_32 times, png_int_32 div));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
|
|
/* Same deal, but issue a warning on overflow and return 0. */
|
|
PNG_EXTERN png_fixed_point png_muldiv_warn PNGARG((png_structp png_ptr,
|
|
png_fixed_point a, png_int_32 times, png_int_32 div));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_GAMMA_SUPPORTED
|
|
/* Calculate a reciprocal - used for gamma values. This returns
|
|
* 0 if the argument is 0 in order to maintain an undefined value,
|
|
* there are no warnings.
|
|
*/
|
|
PNG_EXTERN png_fixed_point png_reciprocal PNGARG((png_fixed_point a));
|
|
|
|
/* The same but gives a reciprocal of the product of two fixed point
|
|
* values. Accuracy is suitable for gamma calculations but this is
|
|
* not exact - use png_muldiv for that.
|
|
*/
|
|
PNG_EXTERN png_fixed_point png_reciprocal2 PNGARG((png_fixed_point a,
|
|
png_fixed_point b));
|
|
#endif
|
|
|
|
#ifdef PNG_READ_GAMMA_SUPPORTED
|
|
/* Internal fixed point gamma correction. These APIs are called as
|
|
* required to convert single values - they don't need to be fast,
|
|
* they are not used when processing image pixel values.
|
|
*
|
|
* While the input is an 'unsigned' value it must actually be the
|
|
* correct bit value - 0..255 or 0..65535 as required.
|
|
*/
|
|
PNG_EXTERN png_uint_16 png_gamma_correct PNGARG((png_structp png_ptr,
|
|
unsigned value, png_fixed_point gamma));
|
|
PNG_EXTERN int png_gamma_significant PNGARG((png_fixed_point gamma));
|
|
PNG_EXTERN png_uint_16 png_gamma_16bit_correct PNGARG((unsigned value,
|
|
png_fixed_point gamma));
|
|
PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned value,
|
|
png_fixed_point gamma));
|
|
PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
|
|
png_byte bit_depth));
|
|
#endif
|
|
|
|
/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
|
|
|
|
|
|
#include "pngdebug.h"
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* PNGPRIV_H */
|