mirror of
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2270 lines
95 KiB
C
2270 lines
95 KiB
C
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/* pngpriv.h - private declarations for use inside libpng
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*
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* Last changed in libpng 1.7.0 [(PENDING RELEASE)]
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* Copyright (c) 1998-2002,2004,2006-2016 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 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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/* Feature Test Macros. The following are defined here to ensure that correctly
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* implemented libraries reveal the APIs libpng needs to build and hide those
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* that are not needed and potentially damaging to the compilation.
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*
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* Feature Test Macros must be defined before any system header is included (see
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* POSIX 1003.1 2.8.2 "POSIX Symbols."
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*
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* These macros only have an effect if the operating system supports either
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* POSIX 1003.1 or C99, or both. On other operating systems (particularly
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* Windows/Visual Studio) there is no effect; the OS specific tests below are
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* still required (as of 2011-05-02.)
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*/
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#define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
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#ifndef PNG_VERSION_INFO_ONLY
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/* Keep standard libraries at the top of this file */
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/* Standard library headers not required by png.h: */
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# include <stdlib.h>
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# include <string.h>
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/* For headers only required with some build configurations see the lines after
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* pnglibconf.h is included!
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*/
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#endif /* VERSION_INFO_ONLY */
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#define PNGLIB_BUILD /*libpng is being built, not used*/
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/* If HAVE_CONFIG_H is defined during the build then the build system must
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* provide an appropriate "config.h" file on the include path. The header file
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* must provide definitions as required below (search for "HAVE_CONFIG_H");
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* see configure.ac for more details of the requirements. The macro
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* "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on
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* 'configure'; define this macro to prevent the configure build including the
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* configure generated config.h. Libpng is expected to compile without *any*
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* special build system support on a reasonably ANSI-C compliant system.
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*/
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#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
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# include <config.h>
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/* Pick up the definition of 'restrict' from config.h if it was read: */
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# define PNG_RESTRICT restrict
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#endif
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/* To support symbol prefixing it is necessary to know *before* including png.h
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* whether the fixed point (and maybe other) APIs are exported, because if they
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* are not internal definitions may be required. This is handled below just
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* before png.h is included, but load the configuration now if it is available.
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*/
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#ifndef PNGLCONF_H
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# include "pnglibconf.h"
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#endif
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/* Local renames may change non-exported API functions from png.h */
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#if defined(PNG_PREFIX) && !defined(PNGPREFIX_H)
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# include "pngprefix.h"
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#endif
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#ifdef PNG_USER_CONFIG
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# include "pngusr.h"
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/* These should have been defined in pngusr.h */
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# ifndef PNG_USER_PRIVATEBUILD
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# define PNG_USER_PRIVATEBUILD "Custom libpng build"
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# endif
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# ifndef PNG_USER_DLLFNAME_POSTFIX
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# define PNG_USER_DLLFNAME_POSTFIX "Cb"
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# endif
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#endif
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#ifndef PNG_VERSION_INFO_ONLY
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/* Additional standard libaries required in certain cases, put only standard
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* ANSI-C89 headers here. If not available, or non-functional, the problem
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* should be fixed by writing a wrapper for the header and the file on your
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* include path.
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*/
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#if defined(PNG_sCAL_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
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/* png.c requires the following ANSI-C constants if the conversion of
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* floating point to ASCII is implemented therein:
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*
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* DBL_MIN_10_EXP Minimum negative integer such that 10^integer is a
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* normalized (double) value.
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* DBL_DIG Maximum number of decimal digits (can be set to any constant)
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* DBL_MIN Smallest 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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#endif /* sCAL && FLOATING_POINT */
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#if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) ||\
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defined(PNG_FLOATING_POINT_SUPPORTED)
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/* ANSI-C90 math functions are required. Full compliance with the standard
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* is probably not a requirement, but the functions must exist and be
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* declared in <math.h>
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*/
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# include <math.h>
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#endif /* FLOATING_ARITHMETIC || FLOATING_POINT */
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#endif /* VERSION_INFO_ONLY */
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/* Is this a build of a DLL where compilation of the object modules requires
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* different preprocessor settings to those required for a simple library? If
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* so PNG_BUILD_DLL must be set.
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*
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* If libpng is used inside a DLL but that DLL does not export the libpng APIs
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* PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
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* static library of libpng then link the DLL against that.
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*/
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#ifndef PNG_BUILD_DLL
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# ifdef DLL_EXPORT
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/* This is set by libtool when files are compiled for a DLL; libtool
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* always compiles twice, even on systems where it isn't necessary. Set
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* PNG_BUILD_DLL in case it is necessary:
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*/
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# define PNG_BUILD_DLL
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# else
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# ifdef _WINDLL
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/* This is set by the Microsoft Visual Studio IDE in projects that
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* build a DLL. It can't easily be removed from those projects (it
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* isn't visible in the Visual Studio UI) so it is a fairly reliable
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* indication that PNG_IMPEXP needs to be set to the DLL export
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* attributes.
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*/
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# define PNG_BUILD_DLL
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# else
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# ifdef __DLL__
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/* This is set by the Borland C system when compiling for a DLL
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* (as above.)
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*/
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# define PNG_BUILD_DLL
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# else
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/* Add additional compiler cases here. */
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# endif
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# endif
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# endif
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#endif /* Setting PNG_BUILD_DLL if required */
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/* See pngconf.h for more details: the builder of the library may set this on
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* the command line to the right thing for the specific compilation system or it
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* may be automagically set above (at present we know of no system where it does
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* need to be set on the command line.)
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*
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* PNG_IMPEXP must be set here when building the library to prevent pngconf.h
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* setting it to the "import" setting for a DLL build.
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*/
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#ifndef PNG_IMPEXP
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# ifdef PNG_BUILD_DLL
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# define PNG_IMPEXP PNG_DLL_EXPORT
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# else
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/* Not building a DLL, or the DLL doesn't require specific export
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* definitions.
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*/
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# define PNG_IMPEXP
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# endif
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#endif
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/* No warnings for private or deprecated functions in the build: */
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#ifndef PNG_DEPRECATED
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# define PNG_DEPRECATED
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#endif
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#ifndef PNG_PRIVATE
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# define PNG_PRIVATE
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#endif
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/* Symbol preprocessing support.
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*
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* To enable listing global, but internal, symbols the following macros should
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* always be used to declare an extern data or function object in this file.
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*/
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#ifndef PNG_INTERNAL_DATA
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# define PNG_INTERNAL_DATA(type, name, array) extern type name array
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#endif
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#ifndef PNG_INTERNAL_FUNCTION
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# define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
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extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
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#endif
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#ifndef PNG_INTERNAL_CALLBACK
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# define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\
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extern PNG_FUNCTION(type, (PNGCBAPI name), args, PNG_EMPTY attributes)
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#endif
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/* If floating or fixed point APIs are disabled they may still be compiled
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* internally. To handle this make sure they are declared as the appropriate
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* internal extern function (otherwise the symbol prefixing stuff won't work and
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* the functions will be used without definitions.)
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*
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* NOTE: although all the API functions are declared here they are not all
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* actually built! Because the declarations are still made it is necessary to
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* fake out types that they depend on.
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*/
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#ifndef PNG_FP_EXPORT
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# ifndef PNG_FLOATING_POINT_SUPPORTED
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# define PNG_FP_EXPORT(ordinal, type, name, args)\
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PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
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# ifndef PNG_VERSION_INFO_ONLY
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typedef struct png_incomplete png_double;
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typedef png_double* png_doublep;
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typedef const png_double* png_const_doublep;
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typedef png_double** png_doublepp;
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# endif
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# endif
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#endif
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#ifndef PNG_FIXED_EXPORT
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# ifndef PNG_FIXED_POINT_SUPPORTED
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# define PNG_FIXED_EXPORT(ordinal, type, name, args)\
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PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
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# endif
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#endif
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/* Include png.h here to get the version info and other macros, pngstruct.h and
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* pnginfo.h are included later under the protection of !PNG_VERSION_INFO_ONLY
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*/
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#include "png.h"
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/* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
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#ifndef PNG_DLL_EXPORT
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# define PNG_DLL_EXPORT
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#endif
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/* This is a global switch to set the compilation for an installed system
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* (a release build). It can be set for testing debug builds to ensure that
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* they will compile when the build type is switched to RC or STABLE, the
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* default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS
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* with either:
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*
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* -DPNG_RELEASE_BUILD Turns on the release compile path
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* -DPNG_RELEASE_BUILD=0 Turns it off
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* or in your pngusr.h with
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* #define PNG_RELEASE_BUILD=1 Turns on the release compile path
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* #define PNG_RELEASE_BUILD=0 Turns it off
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*/
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#ifndef PNG_RELEASE_BUILD
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# define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC)
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#endif
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/* General purpose macros avoid the need to put #if PNG_RELEASE_BUILD
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* macro blocks around function declarations and definitions when the
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* parameter number varies. Using these results in slightly cleaner code.
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*/
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#if PNG_RELEASE_BUILD
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# define only_rel(text) text
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# define only_deb(text)
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# define param_rel(param) param,
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# define param_deb(param)
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#else
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# define only_rel(text)
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# define only_deb(text) text
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# define param_rel(param)
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# define param_deb(param) param,
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#endif
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/* The affirm mechanism results in a minimal png_error() in released versions
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* ('STABLE' versions) and a more descriptive PNG_ABORT in all other cases,
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* when the "condition" is false (zero). If "condition" is true (nonzero),
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* then the affirm mechanism does nothing.
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*
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* The PNG_RELEASE_BUILD macro, defined above, controls the behavior of
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* 'affirm': if set to 1 affirm will call png_error (or png_err) rather than
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* abort. The png_error text is the minimal (file location) text in this case,
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* if it is produced. This flag indicates a STABLE (or RC) build.
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*
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* The macros rely on the naming convention throughout this code - png_ptr
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* exists and is of type png_const_structrp or a compatible type - and the
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* presence in each file of a uniquely defined macro PNG_SRC_FILE; a number
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* indicating which file this is (this is to save space in released versions).
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*
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* 'affirm' is intended to look like the ANSI-C <assert.h> macro; note that
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* this macro can coexist with the assert macro if <assert.h> is
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* included.
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*
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* PNG_SRC_LINE is the position of the affirm macro. There are currently 15
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* main source files (4 bits) and the biggest (pngrtran.c) has more than 4095
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* lines (12 bits). However, to ensure the number will fit into 16-bits in the
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* future and to allow hardware files to use affirm, the encoding is a bit-wise
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* encoding based on the current number of lines.
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*
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* 'debug' is a version of 'affirm' that is completely removed from RELEASE
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* builds. This is used when either an unexpected condition is completely
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* handled or when it can't be handled even by png_error, for example after a
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* memory overwrite.
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*
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* UNTESTED is used to mark code that has not been tested; it causes an assert
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* if the code is executed and (therefore) tested. UNTESTED should not remain
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* in release candidate code.
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*
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* PNG_AFFIRM_TEXT is set to 1 if affirm text should be produced, either
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* the minimal text or, if PNG_RELEASE_BUILD is 0, the more verbose text
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* including the 'condition' string. This value depends on whether the
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* build supports an appropriate way of outputting the message.
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*
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* Note that PNG_AFFIRM_TEXT is not configurable but is worked out here: this
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* is just the affirm code; there's no reason to allow configuration of this
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* option.
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*/
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#if PNG_RELEASE_BUILD ?\
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(defined PNG_ERROR_TEXT_SUPPORTED) :\
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(defined PNG_WARNINGS_SUPPORTED) || (defined PNG_CONSOLE_IO_SUPPORTED)
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# define PNG_AFFIRM_TEXT 1
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#else
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# define PNG_AFFIRM_TEXT 0
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#endif /* PNG_AFFIRM_TEXT definition */
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#define PNG_SRC_LINE (PNG_SRC_FILE + __LINE__)
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/* png_affirmpp and png_impossiblepp are macros to make the correct call to the
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* png_affirm function; these macros do not assume that the png_structp is
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* called png_ptr.
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*/
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#if PNG_RELEASE_BUILD
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# define png_affirmpp(pp, cond)\
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do\
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if (!(cond)) png_affirm(pp, PNG_SRC_LINE);\
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while (0)
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# define png_affirmexp(pp, cond)\
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((cond) ? (void)0 : png_affirm(pp, PNG_SRC_LINE))
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# define png_handled(pp, m) ((void)0)
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# define png_impossiblepp(pp, reason) png_affirm(pp, PNG_SRC_LINE)
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# define debug(cond) do {} while (0)
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# define debug_handled(cond) do {} while (0)
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# if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC
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/* Make sure there are no 'UNTESTED' macros in released code: */
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# define UNTESTED libpng untested code
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# endif
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# define NOT_REACHED do {} while (0)
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#else
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# define png_affirmpp(pp, cond)\
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do\
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if (!(cond)) png_affirm(pp, #cond, PNG_SRC_LINE);\
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while (0)
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# define png_affirmexp(pp, cond)\
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((cond) ? (void)0 : png_affirm(pp, #cond, PNG_SRC_LINE))
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# define png_handled(pp, m) (png_handled_affirm((pp), (m), PNG_SRC_LINE))
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# define png_impossiblepp(pp, reason) png_affirm(pp, reason, PNG_SRC_LINE)
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# define debug(cond) png_affirmpp(png_ptr, cond)
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# define debug_handled(cond)\
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do\
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if (!(cond)) png_handled(png_ptr, #cond);\
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while (0)
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# define UNTESTED png_affirm(png_ptr, "untested code", PNG_SRC_LINE);
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# define NOT_REACHED png_affirm(png_ptr, "NOT REACHED", PNG_SRC_LINE)
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#endif
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#define affirm(cond) png_affirmpp(png_ptr, cond)
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#define affirmexp(cond) png_affirmexp(png_ptr, cond)
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#define handled(m) png_handled(png_ptr, (m))
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#define impossible(cond) png_impossiblepp(png_ptr, cond)
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#define implies(a, b) debug(!(a) || (b))
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/* The defines for PNG_SRC_FILE: */
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#define PNG_SRC_FILE_(f,lines) PNG_SRC_FILE_ ## f + lines
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#define PNG_SRC_FILE_png 0
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#define PNG_SRC_FILE_pngerror (PNG_SRC_FILE_png +8192)
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#define PNG_SRC_FILE_pngget (PNG_SRC_FILE_pngerror +2048)
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#define PNG_SRC_FILE_pngmem (PNG_SRC_FILE_pngget +2048)
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#define PNG_SRC_FILE_pngpread (PNG_SRC_FILE_pngmem +1024)
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#define PNG_SRC_FILE_pngread (PNG_SRC_FILE_pngpread +2048)
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#define PNG_SRC_FILE_pngrio (PNG_SRC_FILE_pngread +8192)
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#define PNG_SRC_FILE_pngrtran (PNG_SRC_FILE_pngrio +1024)
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#define PNG_SRC_FILE_pngrutil (PNG_SRC_FILE_pngrtran +8192)
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#define PNG_SRC_FILE_pngset (PNG_SRC_FILE_pngrutil +8192)
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#define PNG_SRC_FILE_pngtrans (PNG_SRC_FILE_pngset +2048)
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#define PNG_SRC_FILE_pngwio (PNG_SRC_FILE_pngtrans +4096)
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#define PNG_SRC_FILE_pngwrite (PNG_SRC_FILE_pngwio +1024)
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#define PNG_SRC_FILE_pngwtran (PNG_SRC_FILE_pngwrite +4096)
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#define PNG_SRC_FILE_pngwutil (PNG_SRC_FILE_pngwtran +1024)
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#define PNG_SRC_FILE_arm_arm_init (PNG_SRC_FILE_pngwutil +8192)
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#define PNG_SRC_FILE_arm_filter_neon_intrinsics\
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(PNG_SRC_FILE_arm_arm_init +1024)
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/* Add new files by changing the following line: */
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#define PNG_SRC_FILE_LAST (PNG_SRC_FILE_arm_filter_neon_intrinsics +1024)
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/* The following #define must list the files in exactly the same order as
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* the above.
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*/
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#define PNG_FILES\
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PNG_apply(png)\
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PNG_apply(pngerror)\
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PNG_apply(pngget)\
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PNG_apply(pngmem)\
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PNG_apply(pngpread)\
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PNG_apply(pngread)\
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PNG_apply(pngrio)\
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PNG_apply(pngrtran)\
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PNG_apply(pngrutil)\
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PNG_apply(pngset)\
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PNG_apply(pngtrans)\
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PNG_apply(pngwio)\
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PNG_apply(pngwrite)\
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PNG_apply(pngwtran)\
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PNG_apply(pngwutil)\
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PNG_apply(arm_arm_init)\
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PNG_apply(arm_filter_neon_intrinsics)\
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PNG_end
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/* SECURITY and SAFETY:
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*
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* libpng is built with support for internal limits on image dimensions and
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* memory usage. These are documented in scripts/pnglibconf.dfa of the
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* source and recorded in the machine generated header file pnglibconf.h.
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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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*/
|
|
#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
|
|
# define PNG_MAX_MALLOC_64K
|
|
#endif
|
|
|
|
#ifndef PNG_UNUSED
|
|
/* Unused formal parameter warnings are silenced using the following macro
|
|
* which is expected to have no bad effects on performance (optimizing
|
|
* compilers will probably remove it entirely). Note that if you replace
|
|
* it with something other than whitespace, you must include the terminating
|
|
* semicolon.
|
|
*/
|
|
# define PNG_UNUSED(param) (void)param;
|
|
#endif
|
|
|
|
/* This is a convenience for parameters which are not used in release
|
|
* builds.
|
|
*/
|
|
#define PNG_UNUSEDRC(param) only_rel(PNG_UNUSED(param))
|
|
|
|
/* Just a little check that someone hasn't tried to define something
|
|
* contradictory.
|
|
*/
|
|
#if (PNG_ZBUF_SIZE > 32768) && defined(PNG_MAX_MALLOC_64K)
|
|
# undef PNG_ZBUF_SIZE
|
|
# define PNG_ZBUF_SIZE 32768
|
|
#endif
|
|
|
|
/* If warnings or errors are turned off the code is disabled or redirected here.
|
|
* From 1.5.4 functions have been added to allow very limited formatting of
|
|
* error and warning messages - this code will also be disabled here.
|
|
*/
|
|
#ifdef PNG_WARNINGS_SUPPORTED
|
|
# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
|
|
#else
|
|
# define png_warning_parameter(p,number,string) ((void)0)
|
|
# define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
|
|
# define png_warning_parameter_signed(p,number,format,value) ((void)0)
|
|
# define png_formatted_warning(pp,p,message) ((void)(pp))
|
|
# define PNG_WARNING_PARAMETERS(p)
|
|
#endif
|
|
#ifndef PNG_ERROR_TEXT_SUPPORTED
|
|
# define png_fixed_error(s1,s2) png_err(s1)
|
|
#endif
|
|
|
|
/* C allows up-casts from (void*) to any pointer and (const void*) to any
|
|
* pointer to a const object. C++ regards this as a type error and requires an
|
|
* explicit, static, cast and provides the static_cast<> rune to ensure that
|
|
* const is not cast away.
|
|
*/
|
|
#ifdef __cplusplus
|
|
# define png_voidcast(type, value) static_cast<type>(value)
|
|
# define png_upcast(type, value) static_cast<type>(value)
|
|
# define png_constcast(type, value) const_cast<type>(value)
|
|
# define png_aligncast(type, value) \
|
|
static_cast<type>(static_cast<void*>(value))
|
|
# define png_aligncastconst(type, value) \
|
|
static_cast<type>(static_cast<const void*>(value))
|
|
#else
|
|
# define png_voidcast(type, value) (value)
|
|
# define png_upcast(type, value) ((type)(value))
|
|
# define png_constcast(type, value) ((type)(value))
|
|
# define png_aligncast(type, value) ((void*)(value))
|
|
# define png_aligncastconst(type, value) ((const void*)(value))
|
|
#endif /* __cplusplus */
|
|
|
|
/* Some fixed point APIs are still required even if not exported because
|
|
* they get used by the corresponding floating point APIs. This magic
|
|
* deals with this:
|
|
*/
|
|
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
# define PNGFAPI PNGAPI
|
|
#else
|
|
# define PNGFAPI /* PRIVATE */
|
|
#endif
|
|
|
|
/* These macros may need to be architecture dependent. */
|
|
#define PNG_ALIGN_NONE 0 /* do not use data alignment */
|
|
#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
|
|
#ifdef offsetof
|
|
# define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
|
|
#else
|
|
# define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
|
|
#endif
|
|
#define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
|
|
|
|
#ifndef PNG_ALIGN_TYPE
|
|
/* Default to using aligned access optimizations and requiring alignment to a
|
|
* multiple of the data type size. Override in a compiler specific fashion
|
|
* if necessary by inserting tests here:
|
|
*/
|
|
# define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
|
|
#endif
|
|
|
|
#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
|
|
/* This is used because in some compiler implementations non-aligned
|
|
* structure members are supported, so the offsetof approach below fails.
|
|
* Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
|
|
* is good for performance. Do not do this unless you have tested the result
|
|
* and understand it.
|
|
*/
|
|
# define png_alignof(type) (sizeof (type))
|
|
#else
|
|
# if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
|
|
# define png_alignof(type) offsetof(struct{char c; type t;}, t)
|
|
# else
|
|
# if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
|
|
# define png_alignof(type) (1)
|
|
# endif
|
|
/* Else leave png_alignof undefined to prevent use thereof */
|
|
# endif
|
|
#endif
|
|
|
|
/* This implicitly assumes alignment is always to a power of 2. */
|
|
#ifdef png_alignof
|
|
# define png_isaligned(ptr, type)\
|
|
((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0)
|
|
#else
|
|
# define png_isaligned(ptr, type) 0
|
|
#endif
|
|
|
|
/* Buffer alignment control. These #defines control how the buffers used during
|
|
* read are aligned and how big they are.
|
|
*/
|
|
#ifndef PNG_ROW_BUFFER_ALIGN_TYPE
|
|
/* The absolute minimum alignment for a row buffer is that required for
|
|
* png_uint_32 direct access. The #define is of a legal C type that can be
|
|
* used as the type in the definition of the first member of a C union; give
|
|
* a typedef name if in doubt.
|
|
*/
|
|
# define PNG_ROW_BUFFER_ALIGN_TYPE png_uint_32
|
|
#endif /* !ROW_BUFFER_ALIGN_TYPE */
|
|
#ifndef PNG_ROW_BUFFER_BYTE_ALIGN
|
|
/* This is the minimum size in bytes of the buffer used while processing
|
|
* parts of row. Except at the end of the row pixels will always be
|
|
* processed in blocks such that the block size is a multiple of this number
|
|
*/
|
|
# define PNG_ROW_BUFFER_BYTE_ALIGN\
|
|
((unsigned int)/*SAFE*/(sizeof (PNG_ROW_BUFFER_ALIGN_TYPE)))
|
|
#endif /* !ROW_BUFFER_BYTE_ALIGN */
|
|
#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
|
|
# define PNG_MAX_PIXEL_BYTES 16U /* 4x32-bit channels */
|
|
#else /* !READ_USER_TRANSFORM */
|
|
# define PNG_MAX_PIXEL_BYTES 8U /* 4x16-bit channels */
|
|
#endif /* !READ_USER_TRANSFORM */
|
|
/* PNG_ROW_BUFFER_SIZE is a compile time constant for the size of the row
|
|
* buffer. The minimum size of 2048 bytes is intended to allow the buffer to
|
|
* hold a complete 256 entry color map of 64-bit (8-byte) pixels. This is a
|
|
* requirement at some points of the colormap handling code.
|
|
*
|
|
* The maximum size is intended to allow (unsigned int) indexing of the buffer,
|
|
* it only affects systems with a 16-bit unsigned value where it limits the
|
|
* maximum to 4096 bytes.
|
|
*/
|
|
#define PNG_MIN_ROW_BUFFER_SIZE\
|
|
(PNG_MAX_PIXEL_BYTES * PNG_ROW_BUFFER_BYTE_ALIGN * 8U)
|
|
#define PNG_MAX_ROW_BUFFER_SIZE ((UINT_MAX / 16U) + 1U)
|
|
#ifndef PNG_ROW_BUFFER_SIZE
|
|
# define PNG_ROW_BUFFER_SIZE\
|
|
(PNG_MIN_ROW_BUFFER_SIZE < 2048U ? 2048U : PNG_MIN_ROW_BUFFER_SIZE)
|
|
#endif /* ROW_BUFFER_SIZE */
|
|
|
|
/* End of memory model/platform independent support */
|
|
/* End of 1.5.0beta36 move from pngconf.h */
|
|
|
|
/* CONSTANTS and UTILITY MACROS
|
|
* These are used internally by libpng and not exposed in the API
|
|
*/
|
|
|
|
/* Various modes of operation. Note that after an init, mode is set to
|
|
* zero automatically when the structure is created. Three of these
|
|
* are defined in png.h because they need to be visible to applications
|
|
* that call png_set_unknown_chunk().
|
|
*/
|
|
/* #define PNG_HAVE_IHDR 0x01 (defined as (int) in png.h) */
|
|
/* #define PNG_HAVE_PLTE 0x02 (defined as (int) in png.h) */
|
|
#define PNG_HAVE_IDAT 0x04U
|
|
/* #define PNG_AFTER_IDAT 0x08 (defined as (int) in png.h) */
|
|
#define PNG_HAVE_IEND 0x10U
|
|
#define PNG_HAVE_PNG_SIGNATURE 0x20U
|
|
|
|
#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
|
|
defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
|
|
/* See below for the definitions of the tables used in these macros */
|
|
#define PNG_sRGB_FROM_LINEAR(pp, linear) png_check_byte(pp,\
|
|
(png_sRGB_base[(linear)>>15] +\
|
|
((((linear)&0x7fffU)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)
|
|
/* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
|
|
* encoded value with maximum error 0.646365. Note that the input is not a
|
|
* 16-bit value; it has been multiplied by 255! */
|
|
#endif /* PNG_SIMPLIFIED_READ/WRITE */
|
|
|
|
/* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
|
|
* by dividing by 257 *with rounding*. This macro is exact for the given range.
|
|
* See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
|
|
* macro were established by experiment (modifying the added value). The macro
|
|
* has a second variant that takes a value already scaled by 255 and divides by
|
|
* 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
|
|
* only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
|
|
*/
|
|
#define PNG_DIV65535(v24) (((v24) + 32895U) >> 16)
|
|
#define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255U)
|
|
|
|
/* Added to libpng-1.2.6 JB
|
|
* Modified in libpng-1.7.0 to avoid the intermediate calculation overflow
|
|
* when:
|
|
*
|
|
* pixel_bits == 4: any width over 0x3FFFFFFEU overflows
|
|
* pixel_bits == 2: any width over 0x7FFFFFFCU overflows
|
|
*
|
|
* In both these cases any width results in a rowbytes that fits in 32 bits.
|
|
* The problem arose in previous versions because the calculation used was
|
|
* simply ((width x pixel-bit-depth)+7)/8. At the cost of more calculations
|
|
* on pixel_depth this avoids the problem.
|
|
*/
|
|
#define PNG_SHIFTOF(pixel_bits/*<8*/) \
|
|
( (pixel_bits) == 1 ? 3 : \
|
|
( (pixel_bits) == 2 ? 2 : \
|
|
( (pixel_bits) == 4 ? 1 : \
|
|
0/*force bytes*/ ) ) )
|
|
#define PNG_ADDOF(pixel_bits/*<8*/) ((1U<<PNG_SHIFTOF(pixel_bits))-1)
|
|
#define PNG_ROWBYTES(pixel_bits, width) \
|
|
((pixel_bits) >= 8 ? \
|
|
((png_alloc_size_t)(width) * ((pixel_bits) >> 3)) : \
|
|
(((png_alloc_size_t)(width) + PNG_ADDOF(pixel_bits)) >> \
|
|
PNG_SHIFTOF(pixel_bits)) )
|
|
|
|
/* This macros, added in 1.7.0, makes it easy to deduce the number of channels
|
|
* and therefore the pixel depth from the color type. The PNG specification
|
|
* numbers are used in preference to the png.h constants to make it more clear
|
|
* why the macro works.
|
|
*/
|
|
#define PNG_COLOR_TYPE_CHANNELS(ct)\
|
|
(((ct) & PNG_COLOR_MASK_PALETTE) ?\
|
|
1U : 1U+((ct) & 2U/*COLOR*/)+(((ct)>>2)&1U/*ALPHA*/))
|
|
#define PNG_CHANNELS(ps) PNG_COLOR_TYPE_CHANNELS((ps).color_type)
|
|
#define PNG_PIXEL_DEPTH(ps) (PNG_CHANNELS(ps) * (ps).bit_depth)
|
|
|
|
/* 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) )
|
|
|
|
/* Handling of bit-field masks. Because the expression:
|
|
*
|
|
* bit_field & ~mask
|
|
*
|
|
* has implementation defined behavior in ANSI C-90 for many (int) values of
|
|
* 'mask' and because some of these are defined in png.h and passed in (int)
|
|
* parameters use of '~' has been expunged in libpng 1.7 and replaced by this
|
|
* macro, which is well defined in ANSI C-90 (there is a similar, 16-bit,
|
|
* version in pngstruct.h for the colorspace flags.)
|
|
*/
|
|
#define PNG_BIC_MASK(flags) (0xFFFFFFFFU - (flags))
|
|
|
|
/* Conversions 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 conversion 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 conversion 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 (21474.83 is roughly
|
|
* (2^31-1) * 100000). '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),0))
|
|
#endif
|
|
/* else the corresponding function is defined below, inside the scope of the
|
|
* cplusplus test.
|
|
*/
|
|
#endif
|
|
|
|
/* Gamma values (new at libpng-1.5.4): */
|
|
#define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
|
|
#define PNG_GAMMA_MAC_INVERSE 65909
|
|
#define PNG_GAMMA_sRGB_INVERSE 45455
|
|
|
|
/* Almost everything below is C specific; the #defines above can be used in
|
|
* non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
|
|
*/
|
|
#ifndef PNG_VERSION_INFO_ONLY
|
|
|
|
#include "pngstruct.h"
|
|
#include "pnginfo.h"
|
|
|
|
/* Validate the include paths - the include path used to generate pnglibconf.h
|
|
* must match that used in the build, or we must be using pnglibconf.h.prebuilt:
|
|
*/
|
|
#if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
|
|
# error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
|
|
"-I (include path) error: see the notes in pngpriv.h"
|
|
/* This means that when pnglibconf.h was built the copy of zlib.h that it
|
|
* used is not the same as the one being used here. Because the build of
|
|
* libpng makes decisions to use inflateInit2 and inflateReset2 based on the
|
|
* zlib version number and because this affects handling of certain broken
|
|
* PNG files the -I directives must match.
|
|
*
|
|
* The most likely explanation is that you passed a -I in CFLAGS. This will
|
|
* not work; all the preprocessor directories and in particular all the -I
|
|
* directives must be in CPPFLAGS.
|
|
*/
|
|
#endif
|
|
|
|
/* This is used for 16 bit gamma tables -- only the top level pointers are
|
|
* const; this could be changed:
|
|
*/
|
|
typedef const png_uint_16p * png_const_uint_16pp;
|
|
|
|
/* Added to libpng-1.5.7: sRGB conversion tables */
|
|
#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
|
|
defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
|
|
#ifdef PNG_SIMPLIFIED_READ_SUPPORTED
|
|
PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
|
|
/* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
|
|
* 0..65535. This table gives the closest 16-bit answers (no errors).
|
|
*/
|
|
#endif
|
|
|
|
PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
|
|
PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
|
|
#endif /* PNG_SIMPLIFIED_READ/WRITE */
|
|
|
|
|
|
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif /* __cplusplus */
|
|
|
|
/* Internal functions; these are not exported from a DLL however because they
|
|
* are used within several of the C source files they have to be C extern.
|
|
*
|
|
* All of these functions must be declared with PNG_INTERNAL_FUNCTION.
|
|
*/
|
|
/* Affirm handling */
|
|
PNG_INTERNAL_FUNCTION(void, png_affirm,(png_const_structrp png_ptr,
|
|
param_deb(png_const_charp condition) unsigned int position), PNG_NORETURN);
|
|
|
|
#if !PNG_RELEASE_BUILD
|
|
PNG_INTERNAL_FUNCTION(void, png_handled_affirm,(png_const_structrp png_ptr,
|
|
png_const_charp message, unsigned int position), PNG_EMPTY);
|
|
/* This is not marked PNG_NORETURN because in PNG_RELEASE_BUILD it will
|
|
* disappear and control will pass through it.
|
|
*/
|
|
#endif /* !RELEASE_BUILD */
|
|
|
|
/* Character/byte range checking. */
|
|
/* GCC complains about assignments of an (int) expression to a (char) even when
|
|
* it can readily determine that the value is in range. This makes arithmetic
|
|
* on (char) or (png_byte) values tedious. The warning is not issued by
|
|
* default, but libpng coding rules require no warnings leading to excessive,
|
|
* ridiculous and dangerous expressions of the form:
|
|
*
|
|
* <char> = (char)(expression & 0xff)
|
|
*
|
|
* They are dangerous because they hide the warning, which might actually be
|
|
* valid, and therefore merely enable introduction of undetected overflows when
|
|
* code is modified.
|
|
*
|
|
* The following macros exist to reliably detect any overflow in non-release
|
|
* builds. The theory here is that we really want to know about overflows, not
|
|
* merely hide a basically flawed compiler warning by throwing unnecessary casts
|
|
* into the code. The warnings disappear in RC builds so that the released
|
|
* (STABLE) version just assigns the value (with, possibly, a warning if someone
|
|
* turns on the -Wconversion GCC warning.)
|
|
*
|
|
* Doing it this way ensures that the code meets two very important aims:
|
|
*
|
|
* 1) Overflows are detected in pre-release tests; previously versions of libpng
|
|
* have been released that really did have overflows in the RGB calculations.
|
|
* 2) In release builds GCC specific operations, which may reduce the ability
|
|
* of other compilers and even GCC to optimize the code, are avoided.
|
|
*
|
|
* There is one important extra consequence for pre-release code; it is
|
|
* performing a lot of checks in pixel arithmetic that the release code won't
|
|
* perform. As a consequence a build time option, RANGE_CHECK, is provided
|
|
* to allow the checks to be turned off in pre-release when building for
|
|
* performance testing. This is a standard "_SUPPORTED" option except that it
|
|
* cannot be set in the system configuration (pnglibconf.h, pnglibconf.dfa).
|
|
*
|
|
* A separate macro PNG_BYTE() is provided to safely convert an unsigned value
|
|
* to the PNG byte range 0..255. This handles the fact that, technically,
|
|
* an ANSI-C (unsigned char), hence a (png_byte), may be able to store values
|
|
* outside this range. Note that if you are building on a system where this is
|
|
* true libpng is almost certainly going to produce errors; it has never been
|
|
* tested on such a system. For the moment pngconf.h ensures that this will
|
|
* not happen.
|
|
*
|
|
* PNG_UINT_16 does the same thing for a 16-bit value passed in an (int) or
|
|
* (png_uint_32) (where checking is not expected.)
|
|
*/
|
|
#if !PNG_RELEASE_BUILD
|
|
# ifndef PNG_NO_RANGE_CHECK /* Turn off even in pre-release */
|
|
# define PNG_RANGE_CHECK_SUPPORTED
|
|
# endif
|
|
#endif
|
|
|
|
#ifdef PNG_RANGE_CHECK_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(unsigned int, png_bit_affirm,(png_const_structrp png_ptr,
|
|
unsigned int position, unsigned int u, unsigned int bits), PNG_EMPTY);
|
|
|
|
PNG_INTERNAL_FUNCTION(char, png_char_affirm,(png_const_structrp png_ptr,
|
|
unsigned int position, int c), PNG_EMPTY);
|
|
|
|
PNG_INTERNAL_FUNCTION(png_byte, png_byte_affirm,(png_const_structrp png_ptr,
|
|
unsigned int position, int b), PNG_EMPTY);
|
|
|
|
#if INT_MAX >= 65535
|
|
PNG_INTERNAL_FUNCTION(png_uint_16, png_u16_affirm,(png_const_structrp png_ptr,
|
|
unsigned int position, int u), PNG_EMPTY);
|
|
# define png_check_u16(pp, u) (png_u16_affirm((pp), PNG_SRC_LINE, (u)))
|
|
#else
|
|
/* (int) cannot hold a (png_uint_16) so the above function just won't
|
|
* compile correctly, for the moment just do this:
|
|
*/
|
|
# define png_check_u16(pp, u) (u)
|
|
#endif
|
|
|
|
# define png_check_bits(pp, u, bits)\
|
|
(((1U<<(bits))-1) & png_bit_affirm((pp), PNG_SRC_LINE, (u), (bits)))
|
|
# define png_check_char(pp, c) (png_char_affirm((pp), PNG_SRC_LINE, (c)))
|
|
# define png_check_byte(pp, b) (png_byte_affirm((pp), PNG_SRC_LINE, (b)))
|
|
# define PNG_BYTE(b) ((png_byte)((b) & 0xFFU))
|
|
# define PNG_UINT_16(u) ((png_uint_16)((u) & 0xFFFFU))
|
|
#elif !(defined PNG_REMOVE_CASTS) /* && !RANGE_CHECK */
|
|
# define png_check_bits(pp, u, bits) (((1U<<(bits))-1U) & (u))
|
|
# define png_check_char(pp, c) ((char)(c))
|
|
# define png_check_byte(pp, b) ((png_byte)(b))
|
|
# define png_check_u16(pp, u) ((png_uint_16)(u))
|
|
# define PNG_BYTE(b) ((png_byte)((b) & 0xFFU))
|
|
# define PNG_UINT_16(u) ((png_uint_16)((u) & 0xFFFFU))
|
|
#else /* !RANGE_CHECK */
|
|
/* This is somewhat trust-me-it-works: if PNG_REMOVE_CASTS is defined then
|
|
* the casts, which might otherwise change the values, are completely
|
|
* removed. Use this to test your compiler to see if it makes *any*
|
|
* difference (code size or speed.) Currently NOT SUPPORTED.
|
|
*
|
|
* It also makes the PNG_BYTE and PNG_UINT_16 macros do nothing either
|
|
* NOTE: this seems safe at present but might lead to unexpected results
|
|
* if someone writes code to depend on the truncation.
|
|
*/
|
|
# define png_check_bits(pp, u, bits) (u)
|
|
# define png_check_char(pp, c) (c)
|
|
# define png_check_byte(pp, b) (b)
|
|
# define png_check_u16(pp, u) (u)
|
|
# define PNG_BYTE(b) (b)
|
|
# define PNG_UINT_16(u) (u)
|
|
#endif /* RANGE_CHECK */
|
|
|
|
/* Safe calculation of a rowbytes value; does a png_error if the system limits
|
|
* are exceeded.
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(png_alloc_size_t,png_calc_rowbytes,
|
|
(png_const_structrp png_ptr, unsigned int pixel_depth,
|
|
png_uint_32 row_width),PNG_EMPTY);
|
|
|
|
/* Common code to calculate the maximum number of pixels to transform or filter
|
|
* at one time; controlled by PNG_ROW_BUFFER_SIZE above:
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(unsigned int,png_max_pixel_block,
|
|
(png_const_structrp png_ptr),PNG_EMPTY);
|
|
|
|
/* Copy the row in row_buffer; this is the non-interlaced copy used in both the
|
|
* read and write code. 'x_in_dest' specifies whether the 'x' applies to
|
|
* the destination (sp->dp[x], x_in_dest tru) or the source (sp[x]->dp,
|
|
* x_in_dest false).
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(void, png_copy_row,(png_const_structrp png_ptr,
|
|
png_bytep dp, png_const_bytep sp, png_uint_32 x/*in INPUT*/,
|
|
png_uint_32 width/*of INPUT*/, unsigned int pixel_depth,
|
|
int clear/*clear the final byte*/, int x_in_dest),PNG_EMPTY);
|
|
|
|
/* Zlib support */
|
|
#define PNG_UNEXPECTED_ZLIB_RETURN (-7)
|
|
PNG_INTERNAL_FUNCTION(void, png_zstream_error,(z_stream *zstream, int ret),
|
|
PNG_EMPTY);
|
|
/* Used by the zlib handling functions to ensure that z_stream::msg is always
|
|
* set before they return.
|
|
*/
|
|
|
|
#if defined(PNG_FLOATING_POINT_SUPPORTED) && \
|
|
!defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
|
|
(defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
|
|
defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
|
|
defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
|
|
(defined(PNG_sCAL_SUPPORTED) && \
|
|
defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
|
|
PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
|
|
double fp, png_const_charp text),PNG_EMPTY);
|
|
#endif
|
|
|
|
/* Internal base allocator - no messages, NULL on failure to allocate. This
|
|
* does, however, call the application provided allocator and that could call
|
|
* png_error (although that would be a bug in the application implementation.)
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
|
|
png_alloc_size_t size),PNG_ALLOCATED);
|
|
|
|
#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
|
|
defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
|
|
/* Internal array allocator, outputs no error or warning messages on failure,
|
|
* just returns NULL.
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,
|
|
int nelements, size_t element_size),PNG_ALLOCATED);
|
|
|
|
/* The same but an existing array is extended by add_elements. This function
|
|
* also memsets the new elements to 0 and copies the old elements. The old
|
|
* array is not freed or altered.
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_structrp png_ptr,
|
|
png_const_voidp array, int old_elements, int add_elements,
|
|
size_t element_size),PNG_ALLOCATED);
|
|
#endif /* text, sPLT or unknown chunks */
|
|
|
|
/* Magic to create a struct when there is no struct to call the user supplied
|
|
* memory allocators. Because error handling has not been set up the memory
|
|
* handlers can't safely call png_error, but this is an obscure and undocumented
|
|
* restriction so libpng has to assume that the 'free' handler, at least, might
|
|
* call png_error.
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
|
|
(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
|
|
png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
|
|
png_free_ptr free_fn),PNG_ALLOCATED);
|
|
|
|
/* Free memory from internal libpng struct */
|
|
PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
|
|
PNG_EMPTY);
|
|
|
|
/* Free an allocated jmp_buf (always succeeds) */
|
|
PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
|
|
|
|
/* Function to allocate memory for zlib. PNGAPI is disallowed. */
|
|
PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
|
|
PNG_ALLOCATED);
|
|
|
|
/* Function to free memory for zlib. PNGAPI is disallowed. */
|
|
PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
|
|
|
|
/* The next three functions are used by png_init_io to set the default
|
|
* implementations for reading or writing to a stdio (png_FILE_p) stream.
|
|
* They can't be static because in 1.7 png_init_io needs to reference them.
|
|
*/
|
|
#ifdef PNG_STDIO_SUPPORTED
|
|
# ifdef PNG_READ_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
|
|
png_bytep data, png_size_t length),PNG_EMPTY);
|
|
# endif /* READ */
|
|
|
|
# ifdef PNG_WRITE_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
|
|
png_bytep data, png_size_t length),PNG_EMPTY);
|
|
|
|
# ifdef PNG_WRITE_FLUSH_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
|
|
PNG_EMPTY);
|
|
# endif /* WRITE_FLUSH */
|
|
# endif /* WRITE */
|
|
#endif /* STDIO */
|
|
|
|
/* Reset the CRC variable. The CRC is initialized with the chunk tag (4 bytes).
|
|
* NOTE: at present png_struct::chunk_name MUST be set before this as well so
|
|
* that png_struct::current_crc is initialized correctly!
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr,
|
|
png_const_bytep chunk_tag), PNG_EMPTY);
|
|
|
|
/* Write the "data" buffer to whatever output you are using */
|
|
PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
|
|
png_const_voidp data, png_size_t length),PNG_EMPTY);
|
|
|
|
/* Read and check the PNG file signature */
|
|
PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
|
|
png_inforp info_ptr),PNG_EMPTY);
|
|
|
|
/* Read data from whatever input you are using into the "data" buffer */
|
|
PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_voidp data,
|
|
png_size_t length),PNG_EMPTY);
|
|
|
|
/* Read bytes into buf, and update png_ptr->crc */
|
|
PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_voidp buf,
|
|
png_uint_32 length),PNG_EMPTY);
|
|
|
|
/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
|
|
PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
|
|
png_uint_32 skip),PNG_EMPTY);
|
|
|
|
/* 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_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
|
|
png_const_voidp ptr, png_size_t length),PNG_EMPTY);
|
|
|
|
/* Write various chunks */
|
|
|
|
/* Write the IHDR chunk, and update the png_struct with the necessary
|
|
* information.
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp 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_EMPTY);
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
|
|
png_const_colorp palette, unsigned int num_pal),PNG_EMPTY);
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
|
|
|
|
#ifdef PNG_WRITE_gAMA_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
|
|
png_fixed_point file_gamma),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_sBIT_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
|
|
png_const_color_8p sbit, int color_type),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_cHRM_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
|
|
const png_xy *xy), PNG_EMPTY);
|
|
/* The xy value must have been previously validated */
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_sRGB_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
|
|
int intent),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_iCCP_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
|
|
png_const_charp name, png_const_voidp profile), PNG_EMPTY);
|
|
/* The profile must have been previously validated for correctness, the
|
|
* length comes from the first four bytes. Only the base, deflate,
|
|
* compression is supported.
|
|
*/
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_sPLT_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
|
|
png_const_sPLT_tp palette),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_tRNS_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
|
|
png_const_bytep trans, png_const_color_16p values, int number,
|
|
int color_type),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_bKGD_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
|
|
png_const_color_16p values, int color_type),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_hIST_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
|
|
png_const_uint_16p hist, int num_hist),PNG_EMPTY);
|
|
#endif
|
|
|
|
/* Chunks that have keywords */
|
|
#ifdef PNG_WRITE_tEXt_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
|
|
png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_zTXt_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr,
|
|
png_const_charp key, png_const_charp text, int compression),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_iTXt_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
|
|
int compression, png_const_charp key, png_const_charp lang,
|
|
png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
|
|
PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_structrp png_ptr,
|
|
png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_oFFs_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
|
|
png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_pCAL_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
|
|
png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
|
|
png_const_charp units, png_charpp params),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_pHYs_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
|
|
png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
|
|
int unit_type),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_tIME_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
|
|
png_const_timep mod_time),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_sCAL_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
|
|
int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_write_start_IDAT,(png_structrp png_ptr),
|
|
PNG_EMPTY);
|
|
/* Do any required initialization before IDAT or row processing starts. */
|
|
|
|
/* Choose the best filter to use and filter the row data then write it out. If
|
|
* WRITE_FILTERING is not supported this just writes the data out with a zero
|
|
* (NONE) filter byte.
|
|
*
|
|
* This may be called multiple times per row, but calls must be in 'x' order;
|
|
* first a call with x 0 to mark the start of the row and, at the end, one with
|
|
* PNG_ROW_END set (this can be done in the same function call if the whole row
|
|
* is passed.) The following flags are used internally to control pass
|
|
* filtering and deflate:
|
|
*/
|
|
enum
|
|
{
|
|
png_pass_last =0x1U, /* This is the last pass in the image */
|
|
png_pass_last_row =0x2U, /* This is the last row in a pass */
|
|
png_pass_first_row =0x4U, /* This is the first row in a pass */
|
|
png_row_end =0x8U, /* This is the last block in the row */
|
|
png_no_row_info =0x0U /* Placeholder */
|
|
|
|
/* A useful macro; return true if this is the last block of the last row in
|
|
* the image.
|
|
*/
|
|
# define PNG_IDAT_END(f) (((f) & ~png_pass_first_row) == \
|
|
(png_row_end+png_pass_last_row+png_pass_last))
|
|
};
|
|
PNG_INTERNAL_FUNCTION(void,png_write_png_data,(png_structrp png_ptr,
|
|
png_bytep prev_pixels, png_const_bytep unfiltered_row, png_uint_32 x,
|
|
unsigned int width/*pixels*/, unsigned int row_info_flags),
|
|
PNG_EMPTY);
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_write_png_rows,(png_structrp png_ptr,
|
|
png_const_bytep *rows, png_uint_32 num_rows), PNG_EMPTY);
|
|
/* As above but rows[num_rows] of correctly (PNG) formated but unfiltered
|
|
* data are passed in. For an interlaced image the rows will be interlaced
|
|
* rows and therefore may be narrower than the image width.
|
|
*
|
|
* This function advances png_structp::pass and png_structp::row_number as
|
|
* required.
|
|
*/
|
|
|
|
/* Release memory used by the deflate mechanism */
|
|
PNG_INTERNAL_FUNCTION(void, png_deflate_destroy, (png_structp png_ptr),
|
|
PNG_EMPTY);
|
|
#endif /* WRITE */
|
|
|
|
#ifdef PNG_TRANSFORM_MECH_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_transform_free,(png_const_structrp png_ptr,
|
|
png_transformp *list),PNG_EMPTY);
|
|
/* Free the entire transform list, from the given point on. the argument is
|
|
* set to NULL.
|
|
*/
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_init_transform_control,(
|
|
png_transform_controlp out, png_structp png_ptr),PNG_EMPTY);
|
|
/* Initialize a transform control for running the transform list forward (the
|
|
* read case, and write initialization, but the write case is called within
|
|
* pngtrans.c by the above function.)
|
|
*/
|
|
|
|
#ifdef PNG_READ_TRANSFORMS_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(unsigned int,png_run_this_transform_list_forwards,
|
|
(png_transform_controlp tc, png_transformp *start, png_transformp end),
|
|
PNG_EMPTY);
|
|
/* Used by the transform cache code to run a sub-list, from *start to the
|
|
* transform end.
|
|
*/
|
|
#endif /* READ_TRANSFORMS */
|
|
|
|
#ifdef PNG_READ_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(unsigned int,png_run_transform_list_forwards,
|
|
(png_structp png_ptr, png_transform_controlp tc),PNG_EMPTY);
|
|
/* Run the transform list in the forwards direction (from PNG format to
|
|
* memory format). The transform control must be initialized completely by
|
|
* the caller. This function takes account of transforms which delete
|
|
* themselves during the run; it must be used.
|
|
*/
|
|
#endif /* READ */
|
|
|
|
#ifdef PNG_WRITE_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_run_transform_list_backwards,
|
|
(png_structp png_ptr, png_transform_controlp tc),PNG_EMPTY);
|
|
/* Run the transform list in the backwards direction (from memory format to
|
|
* PNG format). The transform control must be initialized completely by
|
|
* the caller. This function takes account of transforms which delete
|
|
* themselves during the run; it must be used.
|
|
*/
|
|
#endif /* WRITE */
|
|
|
|
PNG_INTERNAL_FUNCTION(png_transformp,png_add_transform,(png_structrp png_ptr,
|
|
size_t size, png_transform_fn fn, unsigned int order),PNG_EMPTY);
|
|
/* Add a transform, using the information in 'order' to control the position
|
|
* of the transform in the list, returning a pointer to the transform. The
|
|
* top 8 bits of 'order' control the position in the list. If a transform
|
|
* does not already exist in the list with the given value a new transform
|
|
* will be created and 'fn' and 'order' set. If there is a transform with
|
|
* that value 'fn' must match and 'order' will be updated by combining the
|
|
* new value in with a bitwise or (|). It is up to the function (fn) or the
|
|
* caller of png_add_transform to determine whether the combination is valid.
|
|
*
|
|
* 'size' is used when creating a new transform, it may be larger than
|
|
* (sizeof png_transform) if required to accomodate extra data.
|
|
*
|
|
* Prior to 1.7.0 transforms were executed in an order hard-wired into the
|
|
* code that executed the transform functions. This was summarized in the
|
|
* read case by the following comment from pngrtran.c
|
|
* (png_init_read_transformations), note that this has been marked up to
|
|
* indicate which PNG formats the transforms in the list apply to:
|
|
*
|
|
* *: applies to most formats
|
|
* A: only formats with alpha
|
|
* L: only low-bit-depth (less than 8 bits per component/pixel)
|
|
* H: only high-bit-depth (16-bits per component)
|
|
*
|
|
> From the code of png_do_read_transformations the order is:
|
|
*
|
|
* GGRR For example column: . no action
|
|
* AGG r acts on read
|
|
* BB w acts on write
|
|
* A B acts on both read and write
|
|
>
|
|
> r.r. 1) PNG_EXPAND (including PNG_EXPAND_tRNS)
|
|
> .r.r 2) PNG_STRIP_ALPHA (if no compose)
|
|
> ..rr 3) PNG_RGB_TO_GRAY
|
|
> rr.. 4) PNG_GRAY_TO_RGB iff !PNG_FLAG_BACKGROUND_IS_GRAY
|
|
> rrrr 5) PNG_COMPOSE
|
|
> rrrr 6) PNG_GAMMA
|
|
> .r.r 7) PNG_STRIP_ALPHA (if compose)
|
|
> .r.r 8) PNG_ENCODE_ALPHA
|
|
> rrrr 9) PNG_SCALE_16_TO_8
|
|
> rrrr 10) PNG_16_TO_8
|
|
> ..rr 11) PNG_QUANTIZE (converts to palette)
|
|
> rrrr 12) PNG_EXPAND_16
|
|
> rr.. 13) PNG_GRAY_TO_RGB iff PNG_FLAG_BACKGROUND_IS_GRAY
|
|
> BB.. 14) PNG_INVERT_MONO
|
|
> .B.B 15) PNG_INVERT_ALPHA
|
|
> BBBB 16) PNG_SHIFT
|
|
*
|
|
* Note that transforms from this point on are used in 1.7.0 on palette
|
|
* indices as well; a png_set_pack request (for example) packs the palette
|
|
* index values if the output will be palettized and the grayscale values
|
|
* if it will not be (if the output is low-bit-grayscale, not palette.)
|
|
*
|
|
> B... 17) PNG_PACK
|
|
> ..BB 18) PNG_BGR
|
|
> B... 19) PNG_PACKSWAP
|
|
> rwrw 20) PNG_FILLER (includes PNG_ADD_ALPHA)
|
|
> .B.B 21) PNG_SWAP_ALPHA
|
|
> BBBB 22) PNG_SWAP_BYTES
|
|
> BBBB 23) PNG_USER_TRANSFORM [must be last]
|
|
*
|
|
* Finally, outside the set of transforms prior to 1.7.0, the libpng
|
|
* interlace handling required the pixels to be replicated to match the pixel
|
|
* spacing in the image row; the first part the pre-1.7.0 interlace support,
|
|
* this is still the case when reading, but for writing the interlace is now
|
|
* a transform:
|
|
*
|
|
> BBBB 24) png_do_{read,write}_interlace (interlaced images only).
|
|
*
|
|
* First transforms are grouped according to basic function using the top 3
|
|
* bits of the order code:
|
|
*/
|
|
# define PNG_TR_START 0x0000U /* initial ops on the PNG data */
|
|
# define PNG_TR_ARITHMETIC 0x2000U /* arithmetic linear operations */
|
|
# define PNG_TR_CHANNEL 0x4000U /* PNG conformant format changes */
|
|
# define PNG_TR_QUANTIZE 0x6000U /* quantize and following operations */
|
|
# define PNG_TR_ENCODING 0x8000U /* Row encoding transforms */
|
|
# define PNG_TR_INTERLACE 0xA000U /* write interlace transform */
|
|
/*
|
|
* In libpng 1.7.0 the check on palette index values is moved to the start
|
|
* (of read, end of write, which is where it was before) immediately after
|
|
* the MNG filter handling
|
|
*/
|
|
# define PNG_TR_MNG_INTRAPIXEL (PNG_TR_START + 0x0100U)
|
|
/* Perform intra-pixel differencing (write) or un-differencing on read. */
|
|
# define PNG_TR_CHECK_PALETTE (PNG_TR_START + 0x0200U)
|
|
/* Done before at the start on read, at the end on write to give a
|
|
* consistent postion:
|
|
*
|
|
* PNG_RWTR_CHECK_PALETTE PI W11: happens in pngwrite.c last
|
|
*/
|
|
# define PNG_TR_START_CACHE (PNG_TR_START + 0x0300U)
|
|
/* Not used on a transform; this is just a marker for the point at which
|
|
* palette or low-bit-depth caching can start on read. (The previous
|
|
* operations cannot be cached).
|
|
*/
|
|
# define PNG_TR_INIT_ALPHA (PNG_TR_START + 0x0400U)
|
|
/* This just handles alpha/tRNS initialization issues to resolve the
|
|
* inter-dependencies with tRNS expansion and background composition; it
|
|
* doesn't do anything itself, just sets flags and pushes transforms.
|
|
*/
|
|
/*
|
|
* Prior to 1.7 the arithmetic operations interleaved with the RGB-to-gray
|
|
* and alpha strip byte level ops. This was done to reduce the amount of
|
|
* data processed, i.e. it was an optimization not a requirement. These
|
|
* operations were preceded by the 'expand' operations, which is the
|
|
* opposite; it was done to simplify the code and actually slows things down
|
|
* in the low bit depth gray case. The full list of operations after expand,
|
|
* in the 1.6 order, is:
|
|
*
|
|
* PNG_TR_STRIP_ALPHA png_do_strip_channel (sometimes)
|
|
* PNG_TR_RGB_TO_GRAY png_do_rgb_to_gray
|
|
* PNG_TR_GRAY_TO_RGB png_do_gray_to_rgb (sometimes)
|
|
* PNG_TR_COMPOSE png_do_compose
|
|
* PNG_TR_GAMMA png_do_gamma (if no RGB_TO_GRAY)
|
|
* PNG_TR_STRIP_ALPHA png_do_strip_channel (other times)
|
|
* PNG_TR_ENCODE_ALPHA png_do_encode_alpha
|
|
*
|
|
* In 1.7 the operations are moved round somewhat, including moving alpha and
|
|
* 16-to-8 bit reduction later. This leaves the following operations:
|
|
*
|
|
* PNG_TR_RGB_TO_GRAY png_do_rgb_to_gray
|
|
* PNG_TR_COMPOSE png_do_compose
|
|
* PNG_TR_GAMMA png_do_gamma (if no RGB_TO_GRAY)
|
|
* PNG_TR_ENCODE_ALPHA png_do_encode_alpha
|
|
*
|
|
* Prior to 1.7 some combinations of transforms would do gamma correction
|
|
* twice, the actual implementation in 1.7 is to use the following order and
|
|
* rely on the cache code to optimize gray 1,2,4,8 and (of course) palette.
|
|
*/
|
|
# define PNG_TR_COMPOSE (PNG_TR_ARITHMETIC + 0x0100U)
|
|
/* Handle background composition. This may need to push a gray-to-rgb
|
|
* transform if the background is RGB for gray input. This precedes RGB
|
|
* to gray convertion so that it can handle tRNS appropriately when the
|
|
* background is in the PNG encoding however, typically, the processing
|
|
* happens at PNG_TR_COMPOSE_ALPHA below.
|
|
*
|
|
* NOTE: this must be the first arithmetic transform because the code in
|
|
* png_init_background relies on png_transform_control::gamma being the
|
|
* original PNG gamma.
|
|
*/
|
|
# define PNG_TR_RGB_TO_GRAY (PNG_TR_ARITHMETIC + 0x0200U) /* to gray */
|
|
/* Convert any RGB input (8/16 bit depth, RGB, RGBA) to linear gray
|
|
* 16-bit. This happens first because it cannot be cached; the input data
|
|
* has 24 or 48 bits of uncorrelated data so the transform has to happen
|
|
* pixel-by-pixel. Internally the transform may maintain an 8 or 16-bit
|
|
* gamma correction table (to 16-bit linear) to speed things up.
|
|
*
|
|
* NOTE: this transform must follow PNG_TR_COMPOSE with no intervening
|
|
* transforms; see the code in png_init_background (pngrtran.c) which
|
|
* relies on this during PNG_TC_INIT_FORMAT.
|
|
*/
|
|
# define PNG_TR_COMPOSE_ALPHA (PNG_TR_ARITHMETIC + 0x0300U)
|
|
/* Compose alpha composition and tRNS handling when the background is a
|
|
* screen color. Pushed by PNG_TR_COMPOSE as required.
|
|
*/
|
|
# define PNG_TR_GAMMA_ENCODE (PNG_TR_ARITHMETIC + 0x1F00U) /* last */
|
|
/* Gamma encode the input. This encodes the gray or RGB channels to the
|
|
* required bit depth and either scales the alpha channel or encodes it as
|
|
* well, depending on the requested alpha encoding.
|
|
*/
|
|
/*
|
|
* The 'expand' operations come after the arithmetic ones in libpng 1.7, this
|
|
* forces the arithmetic stuff to do the expand, but since arithmetic is (in
|
|
* 1.7) normally done in 16-bit linear this avoids spurious expands.
|
|
*/
|
|
# define PNG_TR_EXPAND (PNG_TR_CHANNEL + 0x0100U)
|
|
/* Includes:
|
|
*
|
|
* PNG_TR_EXPAND_PALETTE palette images only, includes tRNS
|
|
* PNG_TR_EXPAND_LBP_GRAY grayscale low-bit depth only
|
|
* PNG_TR_EXPAND_tRNS non-palette images only
|
|
*/
|
|
# define PNG_TR_SCALE_16_TO_8 (PNG_TR_CHANNEL + 0x0200U)
|
|
/* Comes after the expand and before the chop version; note that it works on
|
|
* the pixel values directly, so it is a linear transform on a non-linear
|
|
* value.
|
|
*/
|
|
/*
|
|
* To handle transforms that affect the palette entries, not the palette
|
|
* indices in the row data, libpng 1.7 reorders some of the post-quantize
|
|
* transformations to put all the "PC" transforms ahead of all the "PI"
|
|
* transforms. The "PC" transforms that came after png_do_quantize in libpng
|
|
* 1.6 cannot be ordered to be before so they are included in the
|
|
* PNG_TR_QUANTIZE section. The PI transforms are all in PNG_TR_ENCODING,
|
|
* PNG_GRAY_TO_RGB is moved before PNG_TR_QUANTIZE to avoid the unpredictable
|
|
* behavior of png_set_quantize that otherwise arises.
|
|
*
|
|
* The transforms in the PNG_TR_QUANTIZE section are:
|
|
*
|
|
* PNG_TR_EXPAND_16 !P !W
|
|
* PNG_RWTR_INVERT_MONO !P W10: invert the gray channel
|
|
* PNG_RWTR_INVERT_ALPHA PC W8: invert the alpha channel
|
|
* PNG_RWTR_SHIFT PC W6: read: down, write: scale up
|
|
* PNG_RWTR_BGR !P W9
|
|
* PNG_RWTR_FILLER !P W2: add on R, remove on W
|
|
* PNG_RWTR_SWAP_ALPHA !P W7
|
|
* PNG_RWTR_SWAP_16 !P W5
|
|
*
|
|
* The ones in PNG_TR_ENCODING are:
|
|
*
|
|
* PNG_RWTR_PACK PI W4: R: unpack bytes, W: pack
|
|
* PNG_RWTR_PIXEL_SWAP PI W3: Swap pixels in a byte
|
|
* PNG_RWTR_USER PI W1
|
|
*/
|
|
|
|
# define PNG_TR_CHANNEL_PREQ (PNG_TR_CHANNEL + 0x1F00U)
|
|
/* The channel swap transforms that must happen before PNG_TR_QUANTIZE:
|
|
*
|
|
* PNG_TR_STRIP_ALPHA
|
|
* PNG_TR_CHOP_16_TO_8
|
|
* PNG_TR_GRAY_TO_RGB
|
|
*/
|
|
# define PNG_TR_CHANNEL_POSTQ (PNG_TR_QUANTIZE + 0x0100U)
|
|
/* The post-quantize channel swap transforms:
|
|
*
|
|
* PNG_TR_EXPAND_16 !P !W
|
|
* PNG_RWTR_BGR !P W9
|
|
* PNG_RWTR_FILLER !P W2: (filler) add on R, remove on W
|
|
* PNG_RWTR_SWAP_ALPHA !P W7
|
|
* PNG_RWTR_SWAP_16 !P W5
|
|
*
|
|
* The 'CHANNEL' operation sets the transform_control channel_add flag for
|
|
* use below.
|
|
*/
|
|
# define PNG_TR_INVERT (PNG_TR_QUANTIZE + 0x0200U)
|
|
/* Invert MONO and ALPHA. If the channel_add flag is set in the transform
|
|
* control INVERT_ALPHA will not be done; the png_add_alpha/filler APIs
|
|
* happened after png_set_invert_alpha in earlier versions so the filler
|
|
* value had to include the invert.
|
|
*
|
|
* PNG_RWTR_INVERT_MONO !P W10: invert the gray channel
|
|
* PNG_RWTR_INVERT_ALPHA PC W8: invert the alpha channel
|
|
*/
|
|
# define PNG_TR_SHIFT (PNG_TR_QUANTIZE + 0x0300U)
|
|
/* The channel shift, except that if the channel_add flag has been set the
|
|
* alpha channel is not shifted.
|
|
*
|
|
* PNG_RWTR_SHIFT PC W6: read: down, write: scale up
|
|
*/
|
|
# define PNG_TR_PACK (PNG_TR_ENCODING + 0x0200U)
|
|
/* PNG_RWTR_PACK PI W4: R: unpack bytes, W: pack */
|
|
# define PNG_TR_PIXEL_SWAP (PNG_TR_ENCODING + 0x0300U)
|
|
/* PNG_RWTR_PIXEL_SWAP PI W3: Swap pixels in a byte */
|
|
# define PNG_TR_USER (PNG_TR_ENCODING + 0x1F00U)
|
|
/* The user transform; must be last before the interlace handling because it
|
|
* does unpredictable things to the format.
|
|
*
|
|
* PNG_RWTR_USER PI W1
|
|
*/
|
|
|
|
PNG_INTERNAL_FUNCTION(png_transformp,png_push_transform,(png_structrp png_ptr,
|
|
size_t size, png_transform_fn fn, png_transformp *transform,
|
|
png_transform_controlp tc),PNG_EMPTY);
|
|
/* As png_add_transform except that the new transform is inserted ahead of
|
|
* the given transform (*transform). The new transform is returned, but it
|
|
* will also invariably be in *transform. If 'tc' is not NULL the transform
|
|
* callback will also be called; it needs to be called if this function is
|
|
* called while transforms are being run.
|
|
*
|
|
* 'fn' must not be NULL.
|
|
*
|
|
* The transform is inserted with the same 'order' as the passed in
|
|
* *transform, that transform and following transforms are moved up ('order'
|
|
* is incremented) as required to make space. Consequently, unlike with
|
|
* png_add_transform, the transform will always be new. To detect loops
|
|
* (*transform)->fn must not be the same as the passed in 'fn'.
|
|
*/
|
|
|
|
PNG_INTERNAL_FUNCTION(png_voidp,png_transform_cast_check,
|
|
(png_const_structp png_ptr, unsigned int src_line, png_transformp tr,
|
|
size_t size),PNG_EMPTY);
|
|
/* Given a pointer to a transform, 'tr' validate that the underlying derived
|
|
* class has size 'size' using the tr->size field and return the same
|
|
* pointer. If there is a size mismatch the function does an affirm using
|
|
* the given line number.
|
|
*/
|
|
#define png_transform_cast(type, pointer) png_voidcast(type*,\
|
|
png_transform_cast_check(png_ptr, PNG_SRC_LINE, (pointer), sizeof (type)))
|
|
/* This takes a pointer to a transform and safely returns a pointer to a
|
|
* derived transform class (type); type must not have the pointer. It
|
|
* validates the 'size' field. Derived classes start with a png_transform
|
|
* as the first member called 'tr'.
|
|
*/
|
|
#endif /* TRANSFORM_MECH_SUPPORTED */
|
|
|
|
#ifdef PNG_READ_TRANSFORMS_SUPPORTED
|
|
/* Remove a transform from a list, moving the next transform down into
|
|
* *transform.
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(void,png_remove_transform,(png_const_structp png_ptr,
|
|
png_transformp *transform),PNG_EMPTY);
|
|
|
|
/* Initializer for read transforms that handles caching, palette update and
|
|
* palette expansion.
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(unsigned int,png_read_init_transform_mech,
|
|
(png_structp png_ptr, png_transform_control *tc),PNG_EMPTY);
|
|
|
|
/* Optional call to update the users info structure */
|
|
PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
|
|
png_inforp info_ptr),PNG_EMPTY);
|
|
#endif
|
|
|
|
/* APIs which do a tranform on both read and write but where the implementation
|
|
* is separate for each; the read and write init functions are in pngrtran.c or
|
|
* pngwtran.c, the API is in pngtrans.c
|
|
*/
|
|
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED)
|
|
PNG_INTERNAL_FUNCTION(void,png_init_read_pack,(png_transformp *transform,
|
|
png_transform_controlp tc),PNG_EMPTY);
|
|
#endif /* READ_PACK || READ_EXPAND */
|
|
#ifdef PNG_WRITE_PACK_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_init_write_pack,(png_transformp *transform,
|
|
png_transform_controlp tc),PNG_EMPTY);
|
|
#endif /* WRITE_PACK */
|
|
|
|
/* Shared transform functions, defined in pngtran.c */
|
|
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
|
|
defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
|
|
PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(
|
|
png_transform_controlp row_info, png_bytep row, int at_start),PNG_EMPTY);
|
|
#endif /* FILLER */
|
|
|
|
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
|
|
PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_transform_controlp row_info,
|
|
png_bytep row),PNG_EMPTY);
|
|
#endif /* INVERT */
|
|
|
|
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) ||\
|
|
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
|
|
PNG_INTERNAL_FUNCTION(void,png_do_invert_alpha,(png_transform_controlp row_info,
|
|
png_bytep row),PNG_EMPTY);
|
|
#endif /* INVERT_ALPHA */
|
|
|
|
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_add_rgb_to_gray_byte_ops,(png_structrp png_ptr,
|
|
png_transform_controlp tc, unsigned int index, unsigned int order),
|
|
PNG_EMPTY);
|
|
/* This is an init-time utility to add appropriate byte ops to select a given
|
|
* channel from R/G/B.
|
|
*/
|
|
#endif /* READ_RGB_TO_GRAY */
|
|
|
|
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) &&\
|
|
defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
PNG_INTERNAL_FUNCTION(void,png_push_gray_to_rgb_byte_ops,(png_transformp *tr,
|
|
png_transform_controlp tc), PNG_EMPTY);
|
|
/* This is an init-time utility to push appropriate byte ops to expand a
|
|
* grayscale PNG data set to RGB. It calls the function callback so 'tc'
|
|
* must be non-NULL.
|
|
*/
|
|
#endif /* GRAY_TO_RGB && READ_BACKGROUND */
|
|
|
|
#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_add_strip_alpha_byte_ops,(png_structrp png_ptr),
|
|
PNG_EMPTY);
|
|
/* Called from pngrtran.c to add the relevant byte op. */
|
|
#endif /* READ_STRIP_ALPHA */
|
|
|
|
/* The following decodes the appropriate chunks, and does error correction,
|
|
* then calls the appropriate callback for the chunk if it is valid.
|
|
*/
|
|
|
|
#ifdef PNG_READ_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(png_bytep,png_read_buffer,(png_structrp png_ptr,
|
|
png_alloc_size_t new_size, int warn),PNG_EMPTY);
|
|
/* Manage the dynamically allocated read buffer */
|
|
|
|
/* Shared READ IDAT handling: */
|
|
PNG_INTERNAL_FUNCTION(void,png_read_start_IDAT,(png_structrp png_ptr),
|
|
PNG_EMPTY);
|
|
/* Initialize the row buffers, etc. */
|
|
|
|
typedef enum
|
|
{
|
|
png_row_incomplete,
|
|
/* more IDAT data needed for row */
|
|
png_row_process,
|
|
/* png_struct::row_buffer contains a complete row */
|
|
png_row_repeat,
|
|
/* row not in this pass, but the existing row may be used */
|
|
png_row_skip
|
|
/* row not in pass and no appropriate data; skip this row */
|
|
} png_row_op;
|
|
PNG_INTERNAL_FUNCTION(png_row_op,png_read_process_IDAT,(png_structrp png_ptr,
|
|
png_bytep transformed_row, png_bytep display_row, int save_row),
|
|
PNG_EMPTY);
|
|
/* Process a block of IDAT data; the routine returns early if it has
|
|
* obtained a row. It is valid to call this routine with no input data;
|
|
* it will return png_row_incomplete if it needs input.
|
|
*
|
|
* transformed_row: The transformed pixels of the input are written here.
|
|
* For interlaced images only the pixels in the pass will
|
|
* be written, the other pixels will not be touched.
|
|
*
|
|
* display_row: The transformed pixels but replicated to that the entire
|
|
* buffer will have been initialized. For passes after the
|
|
* first the pixels written are determined by the 'block'
|
|
* algorithm; only those *following* pixels which are
|
|
* written by *later* passes are written (with a copy of the
|
|
* pixel from the pass.)
|
|
*
|
|
* save_row: A boolean which indicates that the row (unexpanded)
|
|
* should be saved in png_struct::transformed_row. This can
|
|
* be used in a later call to png_combine_row.
|
|
*
|
|
* During reading the row is built up until png_row_process is returned. At
|
|
* this point png_struct::row_buffer contains the original PNG row from the
|
|
* file and, if save_row was set, png_struct::transformed_row contains the
|
|
* row after the selected row transforms have been performed. For interlaced
|
|
* images both are the width of the interlace pass.
|
|
*
|
|
* When png_row_repeat is returned the same is true, except that the buffers
|
|
* still contain the contents of the preceding row (the one where this
|
|
* funciton returned png_row_pricess).
|
|
*
|
|
* The row buffers should not be accessed if png_row_skip is returned; this
|
|
* row is not modified in the current pass.
|
|
*/
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_read_free_row_buffers,(png_structrp png_ptr),
|
|
PNG_EMPTY);
|
|
/* Free allocated row buffers; done as soon as possible to avoid carrying
|
|
* around all the memory for longer than necessary.
|
|
*/
|
|
|
|
PNG_INTERNAL_FUNCTION(int,png_read_finish_IDAT,(png_structrp png_ptr),
|
|
PNG_EMPTY);
|
|
/* Complete reading of the IDAT chunks. This returns 0 if more data is to
|
|
* be read, 1 if the zlib stream has terminated. Call this routine with
|
|
* zstream.avail_in greater than zero unless there is no more input data.
|
|
* When zstream_avail_in is 0 on entry and the stream does not terminate
|
|
* an "IDAT truncated" error will be output.
|
|
*
|
|
* ENTRY: png_ptr->zstream.{next,avail}_in points to more IDAT data, if
|
|
* available, otherwise avail_in should be 0.
|
|
* RET 0: the LZ stream is still active, more IDAT date is required, if
|
|
* available, the routine *must* be called again.
|
|
* RET 1: the LZ stream has been closed and an error may have been output;
|
|
* png_ptr->zstream_error says whether it has. If not and there
|
|
* is more IDAT data available the caller should output an
|
|
* appropriate (too much IDAT) error message.
|
|
*/
|
|
|
|
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_cache_known_unknown,(png_structrp png_ptr,
|
|
png_const_bytep add, int keep),PNG_EMPTY);
|
|
/* Update the png_struct::known_unknown bit cache which stores whether each
|
|
* known chunk should be treated as unknown.
|
|
*/
|
|
#endif
|
|
|
|
typedef enum
|
|
{
|
|
png_chunk_skip = 0, /* Skip this chunk */
|
|
png_chunk_unknown, /* Pass the chunk to png_handle_unknown */
|
|
png_chunk_process_all, /* Process the chunk all at once */
|
|
png_chunk_process_part /* Process the chunk in parts (for IDAT) */
|
|
} png_chunk_op;
|
|
|
|
PNG_INTERNAL_FUNCTION(png_chunk_op,png_find_chunk_op,(png_structrp png_ptr),
|
|
PNG_EMPTY);
|
|
/* Given a chunk in png_struct::{chunk_name,chunk_length} validate the name
|
|
* and work out how it should be handled. This function checks the chunk
|
|
* location using png_struct::mode and will set the mode appropriately for
|
|
* the known critical chunks but otherwise makes no changes to the stream
|
|
* read state.
|
|
*/
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr,
|
|
const png_uint_32 chunk_name),PNG_EMPTY);
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr,
|
|
const png_uint_32 chunk_length),PNG_EMPTY);
|
|
|
|
#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
|
|
png_inforp info_ptr, png_bytep chunk_data),PNG_EMPTY);
|
|
/* Handle an unknown chunk that needs to be processed. It is only valid
|
|
* to call this after png_find_chunk_op returns png_chunk_unknown. The
|
|
* data argument points to the png_struct::chunk_length bytes of the chunk
|
|
* data.
|
|
*/
|
|
#endif /* READ_UNKNOWN_CHUNKS */
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_handle_chunk,(png_structrp png_ptr,
|
|
png_inforp info_ptr),PNG_EMPTY);
|
|
/* The chunk to handle is in png_struct::chunk_name,chunk_length.
|
|
*
|
|
* NOTE: at present it is only valid to call this after png_find_chunk_op
|
|
* has returned png_chunk_process_all and all the data is available for
|
|
* png_handle_chunk (via the libpng read callback.)
|
|
*/
|
|
#endif /* READ */
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_init_row_info,(png_structrp png_ptr),PNG_EMPTY);
|
|
/* Set the png_struct::row_ members from the PNG file information, running
|
|
* transforms if required.
|
|
*/
|
|
|
|
/* Added at libpng version 1.6.0 */
|
|
#ifdef PNG_GAMMA_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
|
|
png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
|
|
/* Set the colorspace gamma with a value provided by the application or by
|
|
* the gAMA chunk on read. The value will override anything set by an ICC
|
|
* profile.
|
|
*/
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
|
|
png_inforp info_ptr), PNG_EMPTY);
|
|
/* Synchronize the info 'valid' flags with the colorspace */
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
|
|
png_inforp info_ptr), PNG_EMPTY);
|
|
/* Copy the png_struct colorspace to the info_struct and call the above to
|
|
* synchronize the flags. Checks for NULL info_ptr and does nothing.
|
|
*/
|
|
#endif
|
|
|
|
/* Added at libpng version 1.4.0 */
|
|
#ifdef PNG_COLORSPACE_SUPPORTED
|
|
/* These internal functions are for maintaining the colorspace structure within
|
|
* a png_info or png_struct (or, indeed, both).
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
|
|
(png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
|
|
int preferred), PNG_EMPTY);
|
|
|
|
PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
|
|
(png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
|
|
int preferred), PNG_EMPTY);
|
|
|
|
#ifdef PNG_sRGB_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
|
|
png_colorspacerp colorspace, int intent), PNG_EMPTY);
|
|
/* This does set the colorspace gAMA and cHRM values too, but doesn't set the
|
|
* flags to write them, if it returns false there was a problem and an error
|
|
* message has already been output (but the colorspace may still need to be
|
|
* synced to record the invalid flag).
|
|
*/
|
|
#endif /* sRGB */
|
|
|
|
#ifdef PNG_iCCP_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
|
|
png_colorspacerp colorspace, png_const_charp name,
|
|
png_uint_32 profile_length, png_const_bytep profile, int is_color),
|
|
PNG_EMPTY);
|
|
/* The 'name' is used for information only */
|
|
|
|
/* Routines for checking parts of an ICC profile. */
|
|
PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
|
|
png_colorspacerp colorspace, png_const_charp name,
|
|
png_uint_32 profile_length), PNG_EMPTY);
|
|
PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
|
|
png_colorspacerp colorspace, png_const_charp name,
|
|
png_uint_32 profile_length,
|
|
png_const_bytep profile /* first 132 bytes only */, int is_color),
|
|
PNG_EMPTY);
|
|
PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
|
|
png_colorspacerp colorspace, png_const_charp name,
|
|
png_uint_32 profile_length,
|
|
png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
|
|
#ifdef PNG_sRGB_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
|
|
png_const_structrp png_ptr, png_colorspacerp colorspace,
|
|
png_const_bytep profile, uLong adler), PNG_EMPTY);
|
|
/* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
|
|
* be zero to indicate that it is not available. It is used, if provided,
|
|
* as a fast check on the profile when checking to see if it is sRGB.
|
|
*/
|
|
#endif /* sRGB */
|
|
#endif /* iCCP */
|
|
#endif /* COLORSPACE */
|
|
|
|
/* Added at libpng version 1.4.0 */
|
|
PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp 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),PNG_EMPTY);
|
|
|
|
#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
|
|
PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
|
|
png_const_charp name),PNG_NORETURN);
|
|
#endif
|
|
|
|
/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
|
|
* the end. Always leaves the buffer nul terminated. Never errors out (and
|
|
* there is no error code.)
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
|
|
size_t pos, png_const_charp string),PNG_EMPTY);
|
|
|
|
/* Various internal functions to handle formatted warning messages, currently
|
|
* only implemented for warnings.
|
|
*/
|
|
#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
|
|
/* Utility to dump an unsigned value into a buffer, given a start pointer and
|
|
* and end pointer (which should point just *beyond* the end of the buffer!)
|
|
* Returns the pointer to the start of the formatted string. This utility only
|
|
* does unsigned values.
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
|
|
png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
|
|
|
|
/* Convenience macro that takes an array: */
|
|
#define PNG_FORMAT_NUMBER(buffer,format,number) \
|
|
png_format_number(buffer, buffer + (sizeof buffer), format, number)
|
|
|
|
/* Suggested size for a number buffer (enough for 64 bits and a sign!) */
|
|
#define PNG_NUMBER_BUFFER_SIZE 24
|
|
|
|
/* These are the integer formats currently supported, the name is formed from
|
|
* the standard printf(3) format string.
|
|
*/
|
|
#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
|
|
#define PNG_NUMBER_FORMAT_02u 2
|
|
#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
|
|
#define PNG_NUMBER_FORMAT_02d 2
|
|
#define PNG_NUMBER_FORMAT_x 3
|
|
#define PNG_NUMBER_FORMAT_02x 4
|
|
#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
|
|
#endif
|
|
|
|
#ifdef PNG_WARNINGS_SUPPORTED
|
|
/* New defines and members adding in libpng-1.5.4 */
|
|
# define PNG_WARNING_PARAMETER_SIZE 32
|
|
# define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
|
|
|
|
/* An l-value of this type has to be passed to the APIs below to cache the
|
|
* values of the parameters to a formatted warning message.
|
|
*/
|
|
typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
|
|
PNG_WARNING_PARAMETER_SIZE];
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
|
|
int number, png_const_charp string),PNG_EMPTY);
|
|
/* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
|
|
* including the trailing '\0'.
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
|
|
(png_warning_parameters p, int number, int format, png_alloc_size_t value),
|
|
PNG_EMPTY);
|
|
/* Use png_alloc_size_t because it is an unsigned type as big as any we
|
|
* need to output. Use the following for a signed value.
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
|
|
(png_warning_parameters p, int number, int format, png_int_32 value),
|
|
PNG_EMPTY);
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
|
|
png_warning_parameters p, png_const_charp message),PNG_EMPTY);
|
|
/* 'message' follows the X/Open approach of using @1, @2 to insert
|
|
* parameters previously supplied using the above functions. Errors in
|
|
* specifying the parameters will simply result in garbage substitutions.
|
|
*/
|
|
#endif
|
|
|
|
#ifdef PNG_BENIGN_ERRORS_SUPPORTED
|
|
/* Application errors (new in 1.6); use these functions (declared below) for
|
|
* errors in the parameters or order of API function calls on read. The
|
|
* 'warning' should be used for an error that can be handled completely; the
|
|
* 'error' for one which can be handled safely but which may lose application
|
|
* information or settings.
|
|
*
|
|
* By default these both result in a png_error call prior to release, while in a
|
|
* released version the 'warning' is just a warning. However if the application
|
|
* explicitly disables benign errors (explicitly permitting the code to lose
|
|
* information) they both turn into warnings.
|
|
*
|
|
* If benign errors aren't supported they end up as the corresponding base call
|
|
* (png_warning or png_error.)
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
|
|
png_const_charp message),PNG_EMPTY);
|
|
/* The application provided invalid parameters to an API function or called
|
|
* an API function at the wrong time, libpng can completely recover.
|
|
*/
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
|
|
png_const_charp message),PNG_EMPTY);
|
|
/* As above but libpng will ignore the call, or attempt some other partial
|
|
* recovery from the error.
|
|
*/
|
|
#else
|
|
# define png_app_warning(pp,s) png_warning(pp,s)
|
|
# define png_app_error(pp,s) png_error(pp,s)
|
|
#endif
|
|
|
|
PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
|
|
png_const_charp message, int error),PNG_EMPTY);
|
|
/* Report a recoverable issue in chunk data. On read this is used to report
|
|
* a problem found while reading a particular chunk and the
|
|
* png_chunk_benign_error or png_chunk_warning function is used as
|
|
* appropriate. On write this is used to report an error that comes from
|
|
* data set via an application call to a png_set_ API and png_app_error or
|
|
* png_app_warning is used as appropriate.
|
|
*
|
|
* With PNG_CHUNK_FATAL an error can be marked as unrecoverable, and the
|
|
* function will not return.
|
|
*
|
|
* The 'error' parameter must have one of the following values:
|
|
*/
|
|
#define PNG_CHUNK_WARNING 0 /* never an error */
|
|
#define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
|
|
#define PNG_CHUNK_ERROR 2 /* always an error */
|
|
#define PNG_CHUNK_FATAL 3 /* an unrecoverable error */
|
|
|
|
#ifndef PNG_ERROR_TEXT_SUPPORTED
|
|
# define png_chunk_report(pp,e,v) png_chunk_report(pp,NULL,v)
|
|
#endif
|
|
|
|
/* ASCII to FP interfaces, currently only implemented if sCAL
|
|
* support is required.
|
|
*/
|
|
#if defined(PNG_sCAL_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 assumptions about the
|
|
* maximum ridiculous exponent.
|
|
*/
|
|
#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
|
|
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
|
|
png_charp ascii, png_size_t size, double fp, unsigned int precision),
|
|
PNG_EMPTY);
|
|
#endif /* FLOATING_POINT */
|
|
|
|
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
|
|
png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY);
|
|
#endif /* FIXED_POINT */
|
|
#endif /* sCAL */
|
|
|
|
#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 numbers 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 */
|
|
|
|
/* These three values don't affect the parser. They are set but not used.
|
|
*/
|
|
#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
|
|
#define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
|
|
#define PNG_FP_NONZERO 256 /* A non-zero value */
|
|
#define PNG_FP_STICKY 448 /* The above three flags */
|
|
|
|
/* This is available for the caller to store in 'state' if required. Do not
|
|
* call the parser after setting it (the parser sometimes clears it.)
|
|
*/
|
|
#define PNG_FP_INVALID 512 /* 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 */
|
|
|
|
/* Tests on the sticky non-zero and negative flags. To pass these checks
|
|
* the state must also indicate that the whole number is valid - this is
|
|
* achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
|
|
* is equivalent to PNG_FP_OK above.)
|
|
*/
|
|
#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
|
|
/* NZ_MASK: the string is valid and a non-zero negative value */
|
|
#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
|
|
/* Z MASK: the string is valid and a non-zero value. */
|
|
/* PNG_FP_SAW_DIGIT: the string is valid. */
|
|
#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
|
|
#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
|
|
#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
|
|
|
|
/* The actual parser. This can be called repeatedly. It updates
|
|
* the index into the string and the state variable (which must
|
|
* be initialized 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+ and 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_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
|
|
png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
|
|
|
|
/* This is the same but it checks a complete string and returns true
|
|
* only if it just contains a floating point number. As of 1.5.4 this
|
|
* function also returns the state at the end of parsing the number if
|
|
* it was valid (otherwise it returns 0.) This can be used for testing
|
|
* for negative or zero values using the sticky flag.
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
|
|
png_size_t size),PNG_EMPTY);
|
|
#endif /* pCAL || sCAL */
|
|
|
|
#if defined(PNG_GAMMA_SUPPORTED) ||\
|
|
defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_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_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
|
|
png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
|
|
#endif /* GAMMA || INCH_CONVERSIONS || READ_pHYs */
|
|
|
|
#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.
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(unsigned int,png_gamma_nxmbit_correct,
|
|
(unsigned int value, png_fixed_point gamma_val, unsigned int n/*input bits*/,
|
|
unsigned int m/*output bits */),PNG_EMPTY);
|
|
/* In this case the value must have 'n' bits and the output will have 'm'
|
|
* bits.
|
|
*/
|
|
|
|
#if !PNG_RELEASE_BUILD
|
|
PNG_INTERNAL_FUNCTION(int,png_gamma_check,(png_const_structrp png_ptr,
|
|
png_const_transform_controlp tc),PNG_EMPTY);
|
|
/* Debugging only routine to repeat the test used above to determine if the
|
|
* gamma was insignificant.
|
|
*/
|
|
#endif /* !RELEASE_BUILD */
|
|
#endif /* READ_GAMMA */
|
|
|
|
#ifdef PNG_SIMPLIFIED_READ_SUPPORTED
|
|
/* Internal check function to saw if the gamma of the PNG data is far enough
|
|
* from the given screen gamma to require gamma correction (only needed for a
|
|
* bug work-round in the simplified API).
|
|
* TODO: it should be possible to remove the bug work-round in 1.7
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(int,png_need_gamma_correction,(png_const_structrp png_ptr,
|
|
png_fixed_point gamma, int sRGB_output),PNG_EMPTY);
|
|
#endif /* SIMPLIFIED_READ */
|
|
|
|
/* This is a utility macro to say whether a gamma value is close enough to sRGB.
|
|
* The test is now hardwired:
|
|
*
|
|
* API CHANGE: prior to 1.7 this would depend on the build-time
|
|
* PNG_GAMMA_THRESHOLD_FIXED setting, which would cause inconsistent results
|
|
* when the setting was changed. Since this setting can now be changed at
|
|
* run-time it seems more sensible to have a single fixed definition of 'sRGB'.
|
|
*
|
|
* The test is approximately +/- 1%, it allows any decimal value from 0.45 (the
|
|
* two digit rounded version of 1/2.2) to just under 0.46).
|
|
*/
|
|
#define PNG_GAMMA_IS_sRGB(g) ((g) >= 45000 && (g) < 46000)
|
|
|
|
/* SIMPLIFIED READ/WRITE SUPPORT */
|
|
#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
|
|
defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
|
|
/* The internal structure that png_image::opaque points to. */
|
|
typedef struct png_control
|
|
{
|
|
png_structp png_ptr;
|
|
png_infop info_ptr;
|
|
png_voidp error_buf; /* Always a jmp_buf at present. */
|
|
|
|
png_const_bytep memory; /* Memory buffer. */
|
|
png_size_t size; /* Size of the memory buffer. */
|
|
|
|
unsigned int for_write :1; /* Otherwise it is a read structure */
|
|
unsigned int owned_file :1; /* We own the file in io_ptr */
|
|
} png_control;
|
|
|
|
/* Return the pointer to the jmp_buf from a png_control: necessary because C
|
|
* does not reveal the type of the elements of jmp_buf.
|
|
*/
|
|
#ifdef __cplusplus
|
|
# define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
|
|
#else
|
|
# define png_control_jmp_buf(pc) ((pc)->error_buf)
|
|
#endif
|
|
|
|
/* Utility to safely execute a piece of libpng code catching and logging any
|
|
* errors that might occur. Returns true on success, false on failure (either
|
|
* of the function or as a result of a png_error.)
|
|
*/
|
|
PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr,
|
|
png_const_charp error_message),PNG_NORETURN);
|
|
|
|
#ifdef PNG_WARNINGS_SUPPORTED
|
|
PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr,
|
|
png_const_charp warning_message),PNG_EMPTY);
|
|
#else
|
|
# define png_safe_warning 0/*dummy argument*/
|
|
#endif
|
|
|
|
PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
|
|
int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
|
|
|
|
/* Utility to log an error; this also cleans up the png_image; the function
|
|
* always returns 0 (false).
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
|
|
png_const_charp error_message),PNG_EMPTY);
|
|
|
|
/* Safely initialize a stdio pointer - used by both the read and the write
|
|
* code.
|
|
*/
|
|
#ifdef PNG_STDIO_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(int,png_image_init_io,(png_imagep image, png_FILE_p file),
|
|
PNG_EMPTY);
|
|
#endif /* STDIO */
|
|
|
|
#ifndef PNG_SIMPLIFIED_READ_SUPPORTED
|
|
/* png_image_free is used by the write code but not exported */
|
|
PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
|
|
#endif /* !SIMPLIFIED_READ */
|
|
|
|
#endif /* SIMPLIFIED READ/WRITE */
|
|
|
|
#ifdef PNG_READ_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(png_int_32, png_read_setting, (png_structrp png_ptr,
|
|
png_uint_32 setting, png_uint_32 parameter, png_int_32 value), PNG_EMPTY);
|
|
#endif /* READ */
|
|
#ifdef PNG_WRITE_SUPPORTED
|
|
PNG_INTERNAL_FUNCTION(png_int_32, png_write_setting, (png_structrp png_ptr,
|
|
png_uint_32 setting, png_uint_32 parameter, png_int_32 value), PNG_EMPTY);
|
|
/* Implementations of read and write settings, in pngrutil.c and pngwutil.c
|
|
* respectively.
|
|
*/
|
|
#endif /* WRITE */
|
|
|
|
/* Maintainer: Put new private prototypes here ^ */
|
|
|
|
/* These are initialization functions for hardware specific PNG filter
|
|
* optimizations; list these here then select the appropriate one at compile
|
|
* time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined
|
|
* the generic code is used.
|
|
*/
|
|
#ifdef PNG_FILTER_OPTIMIZATIONS
|
|
PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structrp png_ptr,
|
|
unsigned int bpp), PNG_EMPTY);
|
|
/* Just declare the optimization that will be used */
|
|
#else
|
|
/* List *all* the possible optimizations here - this branch is required if
|
|
* the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in
|
|
* CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.
|
|
*/
|
|
PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
|
|
(png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
|
|
#endif
|
|
|
|
#include "pngdebug.h"
|
|
|
|
/* EXTENSION SPECIFIC FUNCTIONS */
|
|
#include "arm/neon.h"
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* PNG_VERSION_INFO_ONLY */
|
|
#endif /* PNGPRIV_H */
|