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1629 lines
62 KiB
1629 lines
62 KiB
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/* pngpriv.h - private declarations for use inside libpng |
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* |
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* For conditions of distribution and use, see copyright notice in png.h |
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* Copyright (c) 1998-2011 Glenn Randers-Pehrson |
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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* |
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* Last changed in libpng 1.5.7 [December 15, 2011] |
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* |
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* This code is released under the libpng license. |
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* For conditions of distribution and use, see the disclaimer |
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* and license in png.h |
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*/ |
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/* The symbols declared in this file (including the functions declared |
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* as PNG_EXTERN) are PRIVATE. They are not part of the libpng public |
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* interface, and are not recommended for use by regular applications. |
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* Some of them may become public in the future; others may stay private, |
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* change in an incompatible way, or even disappear. |
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* Although the libpng users are not forbidden to include this header, |
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* they should be well aware of the issues that may arise from doing so. |
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*/ |
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#ifndef PNGPRIV_H |
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#define PNGPRIV_H |
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/* 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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/* This is required for the definition of abort(), used as a last ditch |
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* error handler when all else fails. |
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*/ |
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#include <stdlib.h> |
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/* This is used to find 'offsetof', used below for alignment tests. */ |
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#include <stddef.h> |
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#define PNGLIB_BUILD /*libpng is being built, not used*/ |
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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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/* 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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#include "png.h" |
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#include "pnginfo.h" |
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#include "pngstruct.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 used for 16 bit gamma tables - only the top level pointers are const, |
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* this could be changed: |
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*/ |
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typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp; |
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/* Added at libpng-1.2.9 */ |
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/* Moved to pngpriv.h at libpng-1.5.0 */ |
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/* config.h is created by and PNG_CONFIGURE_LIBPNG is set by the "configure" |
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* script. We may need it here to get the correct configuration on things |
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* like limits. |
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*/ |
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#ifdef PNG_CONFIGURE_LIBPNG |
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# ifdef HAVE_CONFIG_H |
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# include "config.h" |
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# endif |
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#endif |
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/* Moved to pngpriv.h at libpng-1.5.0 */ |
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/* NOTE: some of these may have been used in external applications as |
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* these definitions were exposed in pngconf.h prior to 1.5. |
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*/ |
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/* If you are running on a machine where you cannot allocate more |
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* than 64K of memory at once, uncomment this. While libpng will not |
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* normally need that much memory in a chunk (unless you load up a very |
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* large file), zlib needs to know how big of a chunk it can use, and |
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* libpng thus makes sure to check any memory allocation to verify it |
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* will fit into memory. |
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* |
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* zlib provides 'MAXSEG_64K' which, if defined, indicates the |
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* same limit and pngconf.h (already included) sets the limit |
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* if certain operating systems are detected. |
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*/ |
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#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) |
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# define PNG_MAX_MALLOC_64K |
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#endif |
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#ifndef PNG_UNUSED |
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/* Unused formal parameter warnings are silenced using the following macro |
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* which is expected to have no bad effects on performance (optimizing |
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* compilers will probably remove it entirely). Note that if you replace |
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* it with something other than whitespace, you must include the terminating |
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* semicolon. |
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*/ |
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# define PNG_UNUSED(param) (void)param; |
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#endif |
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/* Just a little check that someone hasn't tried to define something |
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* contradictory. |
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*/ |
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#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) |
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# undef PNG_ZBUF_SIZE |
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# define PNG_ZBUF_SIZE 65536L |
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#endif |
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/* PNG_STATIC is used to mark internal file scope functions if they need to be |
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* accessed for implementation tests (see the code in tests/?*). |
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*/ |
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#ifndef PNG_STATIC |
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# define PNG_STATIC static |
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#endif |
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/* C99 restrict is used where possible, to do this 'restrict' is defined as |
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* empty if we can't be sure it is supported. configure builds have already |
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* done this work. |
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*/ |
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#ifdef PNG_CONFIGURE_LIBPNG |
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# define PNG_RESTRICT restrict |
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#else |
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/* Modern compilers support restrict, but assume not for anything not |
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* recognized here: |
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*/ |
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# if defined __GNUC__ || defined _MSC_VER || defined __WATCOMC__ |
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# define PNG_RESTRICT restrict |
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# else |
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# define PNG_RESTRICT |
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# endif |
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#endif |
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/* If warnings or errors are turned off the code is disabled or redirected here. |
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* From 1.5.4 functions have been added to allow very limited formatting of |
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* error and warning messages - this code will also be disabled here. |
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*/ |
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#ifdef PNG_WARNINGS_SUPPORTED |
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# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; |
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#else |
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# define png_warning(s1,s2) ((void)(s1)) |
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# define png_chunk_warning(s1,s2) ((void)(s1)) |
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# define png_warning_parameter(p,number,string) ((void)0) |
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# define png_warning_parameter_unsigned(p,number,format,value) ((void)0) |
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# define png_warning_parameter_signed(p,number,format,value) ((void)0) |
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# define png_formatted_warning(pp,p,message) ((void)(pp)) |
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# define PNG_WARNING_PARAMETERS(p) |
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#endif |
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#ifndef PNG_ERROR_TEXT_SUPPORTED |
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# define png_error(s1,s2) png_err(s1) |
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# define png_chunk_error(s1,s2) png_err(s1) |
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# define png_fixed_error(s1,s2) png_err(s1) |
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#endif |
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/* C allows up-casts from (void*) to any pointer and (const void*) to any |
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* pointer to a const object. C++ regards this as a type error and requires an |
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* explicit, static, cast and provides the static_cast<> rune to ensure that |
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* const is not cast away. |
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*/ |
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#ifdef __cplusplus |
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# define png_voidcast(type, value) static_cast<type>(value) |
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#else |
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# define png_voidcast(type, value) (value) |
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#endif /* __cplusplus */ |
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#ifndef PNG_EXTERN |
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/* The functions exported by PNG_EXTERN are internal functions, which |
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* aren't usually used outside the library (as far as I know), so it is |
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* debatable if they should be exported at all. In the future, when it |
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* is possible to have run-time registry of chunk-handling functions, |
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* some of these might be made available again. |
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* |
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* 1.5.7: turned the use of 'extern' back on, since it is localized to pngpriv.h |
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* it should be safe now (it is unclear why it was turned off.) |
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*/ |
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# define PNG_EXTERN extern |
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#endif |
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/* Some fixed point APIs are still required even if not exported because |
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* they get used by the corresponding floating point APIs. This magic |
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* deals with this: |
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*/ |
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#ifdef PNG_FIXED_POINT_SUPPORTED |
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# define PNGFAPI PNGAPI |
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#else |
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# define PNGFAPI /* PRIVATE */ |
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#endif |
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/* Other defines specific to compilers can go here. Try to keep |
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* them inside an appropriate ifdef/endif pair for portability. |
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*/ |
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#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ |
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defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) |
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/* 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_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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# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ |
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defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) |
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/* We need to check that <math.h> hasn't already been included earlier |
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* as it seems it doesn't agree with <fp.h>, yet we should really use |
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* <fp.h> if possible. |
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*/ |
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# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) |
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# include <fp.h> |
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# endif |
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# else |
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# include <math.h> |
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# endif |
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# if defined(_AMIGA) && defined(__SASC) && defined(_M68881) |
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/* Amiga SAS/C: We must include builtin FPU functions when compiling using |
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* MATH=68881 |
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*/ |
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# include <m68881.h> |
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# endif |
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#endif |
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/* This provides the non-ANSI (far) memory allocation routines. */ |
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#if defined(__TURBOC__) && defined(__MSDOS__) |
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# include <mem.h> |
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# include <alloc.h> |
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#endif |
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#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ |
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defined(_WIN32) || defined(__WIN32__) |
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# include <windows.h> /* defines _WINDOWS_ macro */ |
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#endif |
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/* Moved here around 1.5.0beta36 from pngconf.h */ |
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/* Users may want to use these so they are not private. Any library |
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* functions that are passed far data must be model-independent. |
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*/ |
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/* Memory model/platform independent fns */ |
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#ifndef PNG_ABORT |
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# ifdef _WINDOWS_ |
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# define PNG_ABORT() ExitProcess(0) |
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# else |
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# define PNG_ABORT() abort() |
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# endif |
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#endif |
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#ifdef USE_FAR_KEYWORD |
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/* Use this to make far-to-near assignments */ |
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# define CHECK 1 |
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# define NOCHECK 0 |
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# define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK)) |
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# define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK)) |
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# define png_strlen _fstrlen |
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# define png_memcmp _fmemcmp /* SJT: added */ |
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# define png_memcpy _fmemcpy |
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# define png_memset _fmemset |
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#else |
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# ifdef _WINDOWS_ /* Favor Windows over C runtime fns */ |
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# define CVT_PTR(ptr) (ptr) |
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# define CVT_PTR_NOCHECK(ptr) (ptr) |
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# define png_strlen lstrlenA |
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# define png_memcmp memcmp |
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# define png_memcpy CopyMemory |
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# define png_memset memset |
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# else |
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# define CVT_PTR(ptr) (ptr) |
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# define CVT_PTR_NOCHECK(ptr) (ptr) |
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# define png_strlen strlen |
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# define png_memcmp memcmp /* SJT: added */ |
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# define png_memcpy memcpy |
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# define png_memset memset |
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# endif |
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#endif |
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/* These macros may need to be architecture dependent. */ |
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#define PNG_ALIGN_NONE 0 /* do not use data alignment */ |
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#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ |
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#ifdef offsetof |
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# define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ |
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#else |
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# define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ |
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#endif |
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#define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ |
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#ifndef PNG_ALIGN_TYPE |
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/* Default to using aligned access optimizations and requiring alignment to a |
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* multiple of the data type size. Override in a compiler specific fashion |
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* if necessary by inserting tests here: |
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*/ |
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# define PNG_ALIGN_TYPE PNG_ALIGN_SIZE |
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#endif |
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#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE |
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/* This is used because in some compiler implementations non-aligned |
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* structure members are supported, so the offsetof approach below fails. |
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* Set PNG_ALIGN_TO_SIZE=0 for compiler combinations where unaligned access |
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* is good for performance. Do not do this unless you have tested the result |
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* and understand it. |
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*/ |
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# define png_alignof(type) (sizeof (type)) |
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#else |
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# if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET |
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# define png_alignof(type) offsetof(struct{char c; type t;}, t) |
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# else |
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# if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS |
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# define png_alignof(type) (1) |
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# endif |
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/* Else leave png_alignof undefined to prevent use thereof */ |
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# endif |
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#endif |
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/* This implicitly assumes alignment is always to a power of 2. */ |
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#ifdef png_alignof |
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# define png_isaligned(ptr, type)\ |
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((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) |
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#else |
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# define png_isaligned(ptr, type) 0 |
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#endif |
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/* End of memory model/platform independent support */ |
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/* End of 1.5.0beta36 move from pngconf.h */ |
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/* CONSTANTS and UTILITY MACROS |
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* These are used internally by libpng and not exposed in the API |
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*/ |
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/* Various modes of operation. Note that after an init, mode is set to |
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* zero automatically when the structure is created. Three of these |
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* are defined in png.h because they need to be visible to applications |
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* that call png_set_unknown_chunk(). |
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*/ |
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/* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ |
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/* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ |
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#define PNG_HAVE_IDAT 0x04 |
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/* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ |
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#define PNG_HAVE_IEND 0x10 |
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#define PNG_HAVE_gAMA 0x20 |
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#define PNG_HAVE_cHRM 0x40 |
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#define PNG_HAVE_sRGB 0x80 |
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#define PNG_HAVE_CHUNK_HEADER 0x100 |
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#define PNG_WROTE_tIME 0x200 |
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#define PNG_WROTE_INFO_BEFORE_PLTE 0x400 |
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#define PNG_BACKGROUND_IS_GRAY 0x800 |
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#define PNG_HAVE_PNG_SIGNATURE 0x1000 |
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#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ |
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/* Flags for the transformations the PNG library does on the image data */ |
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#define PNG_BGR 0x0001 |
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#define PNG_INTERLACE 0x0002 |
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#define PNG_PACK 0x0004 |
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#define PNG_SHIFT 0x0008 |
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#define PNG_SWAP_BYTES 0x0010 |
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#define PNG_INVERT_MONO 0x0020 |
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#define PNG_QUANTIZE 0x0040 |
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#define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ |
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#define PNG_BACKGROUND_EXPAND 0x0100 |
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#define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ |
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#define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ |
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#define PNG_RGBA 0x0800 |
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#define PNG_EXPAND 0x1000 |
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#define PNG_GAMMA 0x2000 |
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#define PNG_GRAY_TO_RGB 0x4000 |
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#define PNG_FILLER 0x8000 |
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#define PNG_PACKSWAP 0x10000 |
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#define PNG_SWAP_ALPHA 0x20000 |
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#define PNG_STRIP_ALPHA 0x40000 |
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#define PNG_INVERT_ALPHA 0x80000 |
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#define PNG_USER_TRANSFORM 0x100000 |
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#define PNG_RGB_TO_GRAY_ERR 0x200000 |
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#define PNG_RGB_TO_GRAY_WARN 0x400000 |
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#define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ |
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#define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ |
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#define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ |
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#define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ |
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#define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ |
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/* 0x8000000 unused */ |
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/* 0x10000000 unused */ |
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/* 0x20000000 unused */ |
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/* 0x40000000 unused */ |
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/* Flags for png_create_struct */ |
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#define PNG_STRUCT_PNG 0x0001 |
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#define PNG_STRUCT_INFO 0x0002 |
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|
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/* Scaling factor for filter heuristic weighting calculations */ |
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#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) |
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#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) |
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|
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/* Flags for the png_ptr->flags rather than declaring a byte for each one */ |
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#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 |
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#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 |
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#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 |
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#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 |
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#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 |
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#define PNG_FLAG_ZLIB_FINISHED 0x0020 |
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#define PNG_FLAG_ROW_INIT 0x0040 |
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#define PNG_FLAG_FILLER_AFTER 0x0080 |
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#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 |
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#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 |
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#define PNG_FLAG_CRC_CRITICAL_USE 0x0400 |
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#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 |
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#define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ |
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#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ |
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#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ |
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#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 |
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#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 |
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#define PNG_FLAG_LIBRARY_MISMATCH 0x20000 |
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#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 |
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#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 |
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#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000 |
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/* 0x200000 unused */ |
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/* 0x400000 unused */ |
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#define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000 /* Added to libpng-1.4.0 */ |
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#define PNG_FLAG_ZTXT_CUSTOM_STRATEGY 0x1000000 /* 5 lines added */ |
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#define PNG_FLAG_ZTXT_CUSTOM_LEVEL 0x2000000 /* to libpng-1.5.4 */ |
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#define PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL 0x4000000 |
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#define PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS 0x8000000 |
|
#define PNG_FLAG_ZTXT_CUSTOM_METHOD 0x10000000 |
|
/* 0x20000000 unused */ |
|
/* 0x40000000 unused */ |
|
|
|
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ |
|
PNG_FLAG_CRC_ANCILLARY_NOWARN) |
|
|
|
#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ |
|
PNG_FLAG_CRC_CRITICAL_IGNORE) |
|
|
|
#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ |
|
PNG_FLAG_CRC_CRITICAL_MASK) |
|
|
|
/* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib |
|
* can handle at once. This type need be no larger than 16 bits (so maximum of |
|
* 65535), this define allows us to discover how big it is, but limited by the |
|
* maximuum for png_size_t. The value can be overriden in a library build |
|
* (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably |
|
* lower value (e.g. 255 works). A lower value may help memory usage (slightly) |
|
* and may even improve performance on some systems (and degrade it on others.) |
|
*/ |
|
#ifndef ZLIB_IO_MAX |
|
# define ZLIB_IO_MAX ((uInt)-1) |
|
#endif |
|
|
|
/* Save typing and make code easier to understand */ |
|
|
|
#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ |
|
abs((int)((c1).green) - (int)((c2).green)) + \ |
|
abs((int)((c1).blue) - (int)((c2).blue))) |
|
|
|
/* Added to libpng-1.2.6 JB */ |
|
#define PNG_ROWBYTES(pixel_bits, width) \ |
|
((pixel_bits) >= 8 ? \ |
|
((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ |
|
(( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) |
|
|
|
/* PNG_OUT_OF_RANGE returns true if value is outside the range |
|
* ideal-delta..ideal+delta. Each argument is evaluated twice. |
|
* "ideal" and "delta" should be constants, normally simple |
|
* integers, "value" a variable. Added to libpng-1.2.6 JB |
|
*/ |
|
#define PNG_OUT_OF_RANGE(value, ideal, delta) \ |
|
( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) |
|
|
|
/* 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)) |
|
#else |
|
PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp, |
|
png_const_charp text)); |
|
#endif |
|
#endif |
|
|
|
/* Constants for known chunk types. If you need to add a chunk, define the name |
|
* here. For historical reasons these constants have the form png_<name>; i.e. |
|
* the prefix is lower case. Please use decimal values as the parameters to |
|
* match the ISO PNG specification and to avoid relying on the C locale |
|
* interpretation of character values. |
|
* |
|
* Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values |
|
* are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string |
|
* to be generated if required. |
|
* |
|
* PNG_32b correctly produces a value shifted by up to 24 bits, even on |
|
* architectures where (int) is only 16 bits. |
|
*/ |
|
#define PNG_32b(b,s) ((png_uint_32)(b) << (s)) |
|
#define PNG_CHUNK(b1,b2,b3,b4) \ |
|
(PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) |
|
|
|
#define png_IHDR PNG_CHUNK( 73, 72, 68, 82) |
|
#define png_IDAT PNG_CHUNK( 73, 68, 65, 84) |
|
#define png_IEND PNG_CHUNK( 73, 69, 78, 68) |
|
#define png_PLTE PNG_CHUNK( 80, 76, 84, 69) |
|
#define png_bKGD PNG_CHUNK( 98, 75, 71, 68) |
|
#define png_cHRM PNG_CHUNK( 99, 72, 82, 77) |
|
#define png_gAMA PNG_CHUNK(103, 65, 77, 65) |
|
#define png_hIST PNG_CHUNK(104, 73, 83, 84) |
|
#define png_iCCP PNG_CHUNK(105, 67, 67, 80) |
|
#define png_iTXt PNG_CHUNK(105, 84, 88, 116) |
|
#define png_oFFs PNG_CHUNK(111, 70, 70, 115) |
|
#define png_pCAL PNG_CHUNK(112, 67, 65, 76) |
|
#define png_sCAL PNG_CHUNK(115, 67, 65, 76) |
|
#define png_pHYs PNG_CHUNK(112, 72, 89, 115) |
|
#define png_sBIT PNG_CHUNK(115, 66, 73, 84) |
|
#define png_sPLT PNG_CHUNK(115, 80, 76, 84) |
|
#define png_sRGB PNG_CHUNK(115, 82, 71, 66) |
|
#define png_sTER PNG_CHUNK(115, 84, 69, 82) |
|
#define png_tEXt PNG_CHUNK(116, 69, 88, 116) |
|
#define png_tIME PNG_CHUNK(116, 73, 77, 69) |
|
#define png_tRNS PNG_CHUNK(116, 82, 78, 83) |
|
#define png_zTXt PNG_CHUNK(122, 84, 88, 116) |
|
|
|
/* The following will work on (signed char*) strings, whereas the get_uint_32 |
|
* macro will fail on top-bit-set values because of the sign extension. |
|
*/ |
|
#define PNG_CHUNK_FROM_STRING(s)\ |
|
PNG_CHUNK(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3]) |
|
|
|
/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is |
|
* signed and the argument is a (char[]) This macro will fail miserably on |
|
* systems where (char) is more than 8 bits. |
|
*/ |
|
#define PNG_STRING_FROM_CHUNK(s,c)\ |
|
(void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\ |
|
((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c))) |
|
|
|
/* Do the same but terminate with a null character. */ |
|
#define PNG_CSTRING_FROM_CHUNK(s,c)\ |
|
(void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) |
|
|
|
/* Test on flag values as defined in the spec (section 5.4): */ |
|
#define PNG_CHUNK_ANCILLIARY(c) (1 & ((c) >> 29)) |
|
#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLIARY(c)) |
|
#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) |
|
#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) |
|
#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) |
|
|
|
/* 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 |
|
|
|
|
|
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */ |
|
#ifdef __cplusplus |
|
extern "C" { |
|
#endif /* __cplusplus */ |
|
|
|
/* These functions are used internally in the code. They generally |
|
* shouldn't be used unless you are writing code to add or replace some |
|
* functionality in libpng. More information about most functions can |
|
* be found in the files where the functions are located. |
|
*/ |
|
|
|
/* Check the user version string for compatibility, returns false if the version |
|
* numbers aren't compatible. |
|
*/ |
|
PNG_EXTERN int png_user_version_check(png_structp png_ptr, |
|
png_const_charp user_png_ver); |
|
|
|
/* Allocate memory for an internal libpng struct */ |
|
PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct,PNGARG((int type)), |
|
PNG_ALLOCATED); |
|
|
|
/* Free memory from internal libpng struct */ |
|
PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); |
|
|
|
PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct_2, |
|
PNGARG((int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)), |
|
PNG_ALLOCATED); |
|
PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, |
|
png_free_ptr free_fn, png_voidp mem_ptr)); |
|
|
|
/* Free any memory that info_ptr points to and reset struct. */ |
|
PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, |
|
png_infop info_ptr)); |
|
|
|
/* Function to allocate memory for zlib. PNGAPI is disallowed. */ |
|
PNG_EXTERN PNG_FUNCTION(voidpf,png_zalloc,PNGARG((voidpf png_ptr, uInt items, |
|
uInt size)),PNG_ALLOCATED); |
|
|
|
/* Function to free memory for zlib. PNGAPI is disallowed. */ |
|
PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); |
|
|
|
/* Next four functions are used internally as callbacks. PNGCBAPI is required |
|
* but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to |
|
* PNGCBAPI at 1.5.0 |
|
*/ |
|
|
|
PNG_EXTERN void PNGCBAPI png_default_read_data PNGARG((png_structp png_ptr, |
|
png_bytep data, png_size_t length)); |
|
|
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
|
PNG_EXTERN void PNGCBAPI png_push_fill_buffer PNGARG((png_structp png_ptr, |
|
png_bytep buffer, png_size_t length)); |
|
#endif |
|
|
|
PNG_EXTERN void PNGCBAPI png_default_write_data PNGARG((png_structp png_ptr, |
|
png_bytep data, png_size_t length)); |
|
|
|
#ifdef PNG_WRITE_FLUSH_SUPPORTED |
|
# ifdef PNG_STDIO_SUPPORTED |
|
PNG_EXTERN void PNGCBAPI png_default_flush PNGARG((png_structp png_ptr)); |
|
# endif |
|
#endif |
|
|
|
/* Reset the CRC variable */ |
|
PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); |
|
|
|
/* Write the "data" buffer to whatever output you are using */ |
|
PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, |
|
png_const_bytep data, png_size_t length)); |
|
|
|
/* Read and check the PNG file signature */ |
|
PNG_EXTERN void png_read_sig PNGARG((png_structp png_ptr, png_infop info_ptr)); |
|
|
|
/* Read the chunk header (length + type name) */ |
|
PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr)); |
|
|
|
/* Read data from whatever input you are using into the "data" buffer */ |
|
PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, |
|
png_size_t length)); |
|
|
|
/* Read bytes into buf, and update png_ptr->crc */ |
|
PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, |
|
png_size_t length)); |
|
|
|
/* Decompress data in a chunk that uses compression */ |
|
#if defined(PNG_READ_COMPRESSED_TEXT_SUPPORTED) |
|
PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, |
|
int comp_type, png_size_t chunklength, png_size_t prefix_length, |
|
png_size_t *data_length)); |
|
#endif |
|
|
|
/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ |
|
PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); |
|
|
|
/* Read the CRC from the file and compare it to the libpng calculated CRC */ |
|
PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); |
|
|
|
/* Calculate the CRC over a section of data. Note that we are only |
|
* passing a maximum of 64K on systems that have this as a memory limit, |
|
* since this is the maximum buffer size we can specify. |
|
*/ |
|
PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, |
|
png_const_bytep ptr, png_size_t length)); |
|
|
|
#ifdef PNG_WRITE_FLUSH_SUPPORTED |
|
PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); |
|
#endif |
|
|
|
/* Write various chunks */ |
|
|
|
/* Write the IHDR chunk, and update the png_struct with the necessary |
|
* information. |
|
*/ |
|
PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, |
|
png_uint_32 height, |
|
int bit_depth, int color_type, int compression_method, int filter_method, |
|
int interlace_method)); |
|
|
|
PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, |
|
png_const_colorp palette, png_uint_32 num_pal)); |
|
|
|
PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, |
|
png_size_t length)); |
|
|
|
PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); |
|
|
|
#ifdef PNG_WRITE_gAMA_SUPPORTED |
|
# ifdef PNG_FLOATING_POINT_SUPPORTED |
|
PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); |
|
# endif |
|
# ifdef PNG_FIXED_POINT_SUPPORTED |
|
PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, |
|
png_fixed_point file_gamma)); |
|
# endif |
|
#endif |
|
|
|
#ifdef PNG_WRITE_sBIT_SUPPORTED |
|
PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, |
|
png_const_color_8p sbit, int color_type)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_cHRM_SUPPORTED |
|
# ifdef PNG_FLOATING_POINT_SUPPORTED |
|
PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, |
|
double white_x, double white_y, |
|
double red_x, double red_y, double green_x, double green_y, |
|
double blue_x, double blue_y)); |
|
# endif |
|
PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, |
|
png_fixed_point int_white_x, png_fixed_point int_white_y, |
|
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
|
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
|
png_fixed_point int_blue_y)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_sRGB_SUPPORTED |
|
PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, |
|
int intent)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_iCCP_SUPPORTED |
|
PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, |
|
png_const_charp name, int compression_type, |
|
png_const_charp profile, int proflen)); |
|
/* Note to maintainer: profile should be png_bytep */ |
|
#endif |
|
|
|
#ifdef PNG_WRITE_sPLT_SUPPORTED |
|
PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, |
|
png_const_sPLT_tp palette)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_tRNS_SUPPORTED |
|
PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, |
|
png_const_bytep trans, png_const_color_16p values, int number, |
|
int color_type)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_bKGD_SUPPORTED |
|
PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, |
|
png_const_color_16p values, int color_type)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_hIST_SUPPORTED |
|
PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, |
|
png_const_uint_16p hist, int num_hist)); |
|
#endif |
|
|
|
/* Chunks that have keywords */ |
|
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ |
|
defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) |
|
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, |
|
png_const_charp key, png_charpp new_key)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_tEXt_SUPPORTED |
|
PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_const_charp key, |
|
png_const_charp text, png_size_t text_len)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_zTXt_SUPPORTED |
|
PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_const_charp key, |
|
png_const_charp text, png_size_t text_len, int compression)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_iTXt_SUPPORTED |
|
PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, |
|
int compression, png_const_charp key, png_const_charp lang, |
|
png_const_charp lang_key, png_const_charp text)); |
|
#endif |
|
|
|
#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ |
|
PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, |
|
png_infop info_ptr, png_const_textp text_ptr, int num_text)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_oFFs_SUPPORTED |
|
PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, |
|
png_int_32 x_offset, png_int_32 y_offset, int unit_type)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_pCAL_SUPPORTED |
|
PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, |
|
png_int_32 X0, png_int_32 X1, int type, int nparams, |
|
png_const_charp units, png_charpp params)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_pHYs_SUPPORTED |
|
PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, |
|
png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, |
|
int unit_type)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_tIME_SUPPORTED |
|
PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, |
|
png_const_timep mod_time)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_sCAL_SUPPORTED |
|
PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, |
|
int unit, png_const_charp width, png_const_charp height)); |
|
#endif |
|
|
|
/* Called when finished processing a row of data */ |
|
PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); |
|
|
|
/* Internal use only. Called before first row of data */ |
|
PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); |
|
|
|
/* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an |
|
* array of png_ptr->width pixels. If the image is not interlaced or this |
|
* is the final pass this just does a png_memcpy, otherwise the "display" flag |
|
* is used to determine whether to copy pixels that are not in the current pass. |
|
* |
|
* Because 'png_do_read_interlace' (below) replicates pixels this allows this |
|
* function to achieve the documented 'blocky' appearance during interlaced read |
|
* if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' |
|
* are not changed if they are not in the current pass, when display is 0. |
|
* |
|
* 'display' must be 0 or 1, otherwise the memcpy will be done regardless. |
|
* |
|
* The API always reads from the png_struct row buffer and always assumes that |
|
* it is full width (png_do_read_interlace has already been called.) |
|
* |
|
* This function is only ever used to write to row buffers provided by the |
|
* caller of the relevant libpng API and the row must have already been |
|
* transformed by the read transformations. |
|
* |
|
* The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed |
|
* bitmasks for use within the code, otherwise runtime generated masks are used. |
|
* The default is compile time masks. |
|
*/ |
|
#ifndef PNG_USE_COMPILE_TIME_MASKS |
|
# define PNG_USE_COMPILE_TIME_MASKS 1 |
|
#endif |
|
PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, |
|
int display)); |
|
|
|
#ifdef PNG_READ_INTERLACING_SUPPORTED |
|
/* Expand an interlaced row: the 'row_info' describes the pass data that has |
|
* been read in and must correspond to the pixels in 'row', the pixels are |
|
* expanded (moved apart) in 'row' to match the final layout, when doing this |
|
* the pixels are *replicated* to the intervening space. This is essential for |
|
* the correct operation of png_combine_row, above. |
|
*/ |
|
PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, |
|
png_bytep row, int pass, png_uint_32 transformations)); |
|
#endif |
|
|
|
/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ |
|
|
|
#ifdef PNG_WRITE_INTERLACING_SUPPORTED |
|
/* Grab pixels out of a row for an interlaced pass */ |
|
PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, |
|
png_bytep row, int pass)); |
|
#endif |
|
|
|
/* Unfilter a row: check the filter value before calling this, there is no point |
|
* calling it for PNG_FILTER_VALUE_NONE. |
|
*/ |
|
PNG_EXTERN void png_read_filter_row PNGARG((png_structp pp, png_row_infop row_info, |
|
png_bytep row, png_const_bytep prev_row, int filter)); |
|
|
|
PNG_EXTERN void png_read_filter_row_up_neon PNGARG((png_row_infop row_info, |
|
png_bytep row, png_const_bytep prev_row)); |
|
PNG_EXTERN void png_read_filter_row_sub3_neon PNGARG((png_row_infop row_info, |
|
png_bytep row, png_const_bytep prev_row)); |
|
PNG_EXTERN void png_read_filter_row_sub4_neon PNGARG((png_row_infop row_info, |
|
png_bytep row, png_const_bytep prev_row)); |
|
PNG_EXTERN void png_read_filter_row_avg3_neon PNGARG((png_row_infop row_info, |
|
png_bytep row, png_const_bytep prev_row)); |
|
PNG_EXTERN void png_read_filter_row_avg4_neon PNGARG((png_row_infop row_info, |
|
png_bytep row, png_const_bytep prev_row)); |
|
PNG_EXTERN void png_read_filter_row_paeth3_neon PNGARG((png_row_infop row_info, |
|
png_bytep row, png_const_bytep prev_row)); |
|
PNG_EXTERN void png_read_filter_row_paeth4_neon PNGARG((png_row_infop row_info, |
|
png_bytep row, png_const_bytep prev_row)); |
|
|
|
/* Choose the best filter to use and filter the row data */ |
|
PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, |
|
png_row_infop row_info)); |
|
|
|
/* Finish a row while reading, dealing with interlacing passes, etc. */ |
|
PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); |
|
|
|
/* Initialize the row buffers, etc. */ |
|
PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); |
|
|
|
#ifdef PNG_READ_TRANSFORMS_SUPPORTED |
|
/* Optional call to update the users info structure */ |
|
PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, |
|
png_infop info_ptr)); |
|
#endif |
|
|
|
/* These are the functions that do the transformations */ |
|
#ifdef PNG_READ_FILLER_SUPPORTED |
|
PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, |
|
png_bytep row, png_uint_32 filler, png_uint_32 flags)); |
|
#endif |
|
|
|
#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED |
|
PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED |
|
PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
#endif |
|
|
|
#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED |
|
PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED |
|
PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
#endif |
|
|
|
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
|
defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
|
PNG_EXTERN void png_do_strip_channel PNGARG((png_row_infop row_info, |
|
png_bytep row, int at_start)); |
|
#endif |
|
|
|
#ifdef PNG_16BIT_SUPPORTED |
|
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
|
PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
#endif |
|
#endif |
|
|
|
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ |
|
defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
|
PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
#endif |
|
|
|
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
|
PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, |
|
png_row_infop row_info, png_bytep row)); |
|
#endif |
|
|
|
#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED |
|
PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
#endif |
|
|
|
#ifdef PNG_READ_PACK_SUPPORTED |
|
PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
#endif |
|
|
|
#ifdef PNG_READ_SHIFT_SUPPORTED |
|
PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, |
|
png_bytep row, png_const_color_8p sig_bits)); |
|
#endif |
|
|
|
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
|
PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
#endif |
|
|
|
#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED |
|
PNG_EXTERN void png_do_scale_16_to_8 PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
#endif |
|
|
|
#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED |
|
PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
#endif |
|
|
|
#ifdef PNG_READ_QUANTIZE_SUPPORTED |
|
PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info, |
|
png_bytep row, png_const_bytep palette_lookup, |
|
png_const_bytep quantize_lookup)); |
|
|
|
# ifdef PNG_CORRECT_PALETTE_SUPPORTED |
|
PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, |
|
png_colorp palette, int num_palette)); |
|
# endif |
|
#endif |
|
|
|
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
|
PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_PACK_SUPPORTED |
|
PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, |
|
png_bytep row, png_uint_32 bit_depth)); |
|
#endif |
|
|
|
#ifdef PNG_WRITE_SHIFT_SUPPORTED |
|
PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, |
|
png_bytep row, png_const_color_8p bit_depth)); |
|
#endif |
|
|
|
#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ |
|
defined(PNG_READ_ALPHA_MODE_SUPPORTED) |
|
PNG_EXTERN void png_do_compose PNGARG((png_row_infop row_info, |
|
png_bytep row, png_structp png_ptr)); |
|
#endif |
|
|
|
#ifdef PNG_READ_GAMMA_SUPPORTED |
|
PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, |
|
png_bytep row, png_structp png_ptr)); |
|
#endif |
|
|
|
#ifdef PNG_READ_ALPHA_MODE_SUPPORTED |
|
PNG_EXTERN void png_do_encode_alpha PNGARG((png_row_infop row_info, |
|
png_bytep row, png_structp png_ptr)); |
|
#endif |
|
|
|
#ifdef PNG_READ_EXPAND_SUPPORTED |
|
PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, |
|
png_bytep row, png_const_colorp palette, png_const_bytep trans, |
|
int num_trans)); |
|
PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, |
|
png_bytep row, png_const_color_16p trans_color)); |
|
#endif |
|
|
|
#ifdef PNG_READ_EXPAND_16_SUPPORTED |
|
PNG_EXTERN void png_do_expand_16 PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
#endif |
|
|
|
/* The following decodes the appropriate chunks, and does error correction, |
|
* then calls the appropriate callback for the chunk if it is valid. |
|
*/ |
|
|
|
/* Decode the IHDR chunk */ |
|
PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
|
|
#ifdef PNG_READ_bKGD_SUPPORTED |
|
PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_READ_cHRM_SUPPORTED |
|
PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_READ_gAMA_SUPPORTED |
|
PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_READ_hIST_SUPPORTED |
|
PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_READ_iCCP_SUPPORTED |
|
PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif /* PNG_READ_iCCP_SUPPORTED */ |
|
|
|
#ifdef PNG_READ_iTXt_SUPPORTED |
|
PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_READ_oFFs_SUPPORTED |
|
PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_READ_pCAL_SUPPORTED |
|
PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_READ_pHYs_SUPPORTED |
|
PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_READ_sBIT_SUPPORTED |
|
PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_READ_sCAL_SUPPORTED |
|
PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_READ_sPLT_SUPPORTED |
|
PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif /* PNG_READ_sPLT_SUPPORTED */ |
|
|
|
#ifdef PNG_READ_sRGB_SUPPORTED |
|
PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_READ_tEXt_SUPPORTED |
|
PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_READ_tIME_SUPPORTED |
|
PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_READ_tRNS_SUPPORTED |
|
PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_READ_zTXt_SUPPORTED |
|
PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
|
png_uint_32 length)); |
|
#endif |
|
|
|
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
|
PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, |
|
png_infop info_ptr, png_uint_32 length)); |
|
#endif |
|
|
|
PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, |
|
png_uint_32 chunk_name)); |
|
|
|
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
|
/* Exactly as png_handle_as_unknown() except that the argument is a 32-bit chunk |
|
* name, not a string. |
|
*/ |
|
PNG_EXTERN int png_chunk_unknown_handling PNGARG((png_structp png_ptr, |
|
png_uint_32 chunk_name)); |
|
#endif |
|
|
|
/* Handle the transformations for reading and writing */ |
|
#ifdef PNG_READ_TRANSFORMS_SUPPORTED |
|
PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr, |
|
png_row_infop row_info)); |
|
#endif |
|
#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED |
|
PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr, |
|
png_row_infop row_info)); |
|
#endif |
|
|
|
#ifdef PNG_READ_TRANSFORMS_SUPPORTED |
|
PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); |
|
#endif |
|
|
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
|
PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, |
|
png_infop info_ptr)); |
|
PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, |
|
png_infop info_ptr)); |
|
PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); |
|
PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, |
|
png_uint_32 length)); |
|
PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); |
|
PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); |
|
PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, |
|
png_bytep buffer, png_size_t buffer_length)); |
|
PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); |
|
PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, |
|
png_bytep buffer, png_size_t buffer_length)); |
|
PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); |
|
PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, |
|
png_infop info_ptr, png_uint_32 length)); |
|
PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, |
|
png_infop info_ptr)); |
|
PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, |
|
png_infop info_ptr)); |
|
PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); |
|
PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, |
|
png_infop info_ptr)); |
|
PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, |
|
png_infop info_ptr)); |
|
PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); |
|
# ifdef PNG_READ_tEXt_SUPPORTED |
|
PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, |
|
png_infop info_ptr, png_uint_32 length)); |
|
PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, |
|
png_infop info_ptr)); |
|
# endif |
|
# ifdef PNG_READ_zTXt_SUPPORTED |
|
PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, |
|
png_infop info_ptr, png_uint_32 length)); |
|
PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, |
|
png_infop info_ptr)); |
|
# endif |
|
# ifdef PNG_READ_iTXt_SUPPORTED |
|
PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, |
|
png_infop info_ptr, png_uint_32 length)); |
|
PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, |
|
png_infop info_ptr)); |
|
# endif |
|
|
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
|
|
|
#ifdef PNG_MNG_FEATURES_SUPPORTED |
|
PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, |
|
png_bytep row)); |
|
#endif |
|
|
|
/* Added at libpng version 1.4.0 */ |
|
#ifdef PNG_CHECK_cHRM_SUPPORTED |
|
PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, |
|
png_fixed_point int_white_x, png_fixed_point int_white_y, |
|
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
|
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
|
png_fixed_point int_blue_y)); |
|
#endif |
|
|
|
#ifdef PNG_CHECK_cHRM_SUPPORTED |
|
/* Added at libpng version 1.2.34 and 1.4.0 */ |
|
/* Currently only used by png_check_cHRM_fixed */ |
|
PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2, |
|
unsigned long *hi_product, unsigned long *lo_product)); |
|
#endif |
|
|
|
#ifdef PNG_cHRM_SUPPORTED |
|
/* Added at libpng version 1.5.5 */ |
|
typedef struct png_xy |
|
{ |
|
png_fixed_point redx, redy; |
|
png_fixed_point greenx, greeny; |
|
png_fixed_point bluex, bluey; |
|
png_fixed_point whitex, whitey; |
|
} png_xy; |
|
|
|
typedef struct png_XYZ |
|
{ |
|
png_fixed_point redX, redY, redZ; |
|
png_fixed_point greenX, greenY, greenZ; |
|
png_fixed_point blueX, blueY, blueZ; |
|
} png_XYZ; |
|
|
|
/* The conversion APIs return 0 on success, non-zero on a parameter error. They |
|
* allow conversion between the above representations of a color encoding. When |
|
* converting from XYZ end points to chromaticities the absolute magnitude of |
|
* the end points is lost, when converting back the sum of the Y values of the |
|
* three end points will be 1.0 |
|
*/ |
|
PNG_EXTERN int png_xy_from_XYZ PNGARG((png_xy *xy, png_XYZ XYZ)); |
|
PNG_EXTERN int png_XYZ_from_xy PNGARG((png_XYZ *XYZ, png_xy xy)); |
|
PNG_EXTERN int png_XYZ_from_xy_checked PNGARG((png_structp png_ptr, |
|
png_XYZ *XYZ, png_xy xy)); |
|
#endif |
|
|
|
/* Added at libpng version 1.4.0 */ |
|
PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr, |
|
png_uint_32 width, png_uint_32 height, int bit_depth, |
|
int color_type, int interlace_type, int compression_type, |
|
int filter_type)); |
|
|
|
/* Free all memory used by the read (old method - NOT DLL EXPORTED) */ |
|
PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr, |
|
png_infop info_ptr, png_infop end_info_ptr)); |
|
|
|
/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ |
|
PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr)); |
|
|
|
#ifdef USE_FAR_KEYWORD /* memory model conversion function */ |
|
PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr, png_voidp ptr, |
|
int check)); |
|
#endif /* USE_FAR_KEYWORD */ |
|
|
|
#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) |
|
PNG_EXTERN PNG_FUNCTION(void, png_fixed_error, (png_structp 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_EXTERN size_t png_safecat(png_charp buffer, size_t bufsize, size_t pos, |
|
png_const_charp string); |
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/* Various internal functions to handle formatted warning messages, currently |
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* only implemented for warnings. |
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*/ |
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#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) |
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/* Utility to dump an unsigned value into a buffer, given a start pointer and |
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* and end pointer (which should point just *beyond* the end of the buffer!) |
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* Returns the pointer to the start of the formatted string. This utility only |
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* does unsigned values. |
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*/ |
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PNG_EXTERN png_charp png_format_number(png_const_charp start, png_charp end, |
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int format, png_alloc_size_t number); |
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/* Convenience macro that takes an array: */ |
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#define PNG_FORMAT_NUMBER(buffer,format,number) \ |
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png_format_number(buffer, buffer + (sizeof buffer), format, number) |
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/* Suggested size for a number buffer (enough for 64 bits and a sign!) */ |
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#define PNG_NUMBER_BUFFER_SIZE 24 |
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/* These are the integer formats currently supported, the name is formed from |
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* the standard printf(3) format string. |
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*/ |
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#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ |
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#define PNG_NUMBER_FORMAT_02u 2 |
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#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ |
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#define PNG_NUMBER_FORMAT_02d 2 |
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#define PNG_NUMBER_FORMAT_x 3 |
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#define PNG_NUMBER_FORMAT_02x 4 |
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#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ |
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#endif |
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#ifdef PNG_WARNINGS_SUPPORTED |
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/* New defines and members adding in libpng-1.5.4 */ |
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# define PNG_WARNING_PARAMETER_SIZE 32 |
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# define PNG_WARNING_PARAMETER_COUNT 8 |
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/* An l-value of this type has to be passed to the APIs below to cache the |
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* values of the parameters to a formatted warning message. |
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*/ |
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typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ |
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PNG_WARNING_PARAMETER_SIZE]; |
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PNG_EXTERN void png_warning_parameter(png_warning_parameters p, int number, |
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png_const_charp string); |
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/* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, |
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* including the trailing '\0'. |
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*/ |
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PNG_EXTERN void png_warning_parameter_unsigned(png_warning_parameters p, |
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int number, int format, png_alloc_size_t value); |
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/* Use png_alloc_size_t because it is an unsigned type as big as any we |
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* need to output. Use the following for a signed value. |
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*/ |
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PNG_EXTERN void png_warning_parameter_signed(png_warning_parameters p, |
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int number, int format, png_int_32 value); |
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PNG_EXTERN void png_formatted_warning(png_structp png_ptr, |
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png_warning_parameters p, png_const_charp message); |
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/* 'message' follows the X/Open approach of using @1, @2 to insert |
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* parameters previously supplied using the above functions. Errors in |
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* specifying the paramters will simple result in garbage substitutions. |
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*/ |
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#endif |
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/* ASCII to FP interfaces, currently only implemented if sCAL |
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* support is required. |
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*/ |
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#if defined(PNG_READ_sCAL_SUPPORTED) |
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/* MAX_DIGITS is actually the maximum number of characters in an sCAL |
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* width or height, derived from the precision (number of significant |
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* digits - a build time settable option) and assumpitions about the |
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* maximum ridiculous exponent. |
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*/ |
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#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) |
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#ifdef PNG_FLOATING_POINT_SUPPORTED |
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PNG_EXTERN void png_ascii_from_fp PNGARG((png_structp png_ptr, png_charp ascii, |
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png_size_t size, double fp, unsigned int precision)); |
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#endif /* FLOATING_POINT */ |
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#ifdef PNG_FIXED_POINT_SUPPORTED |
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PNG_EXTERN void png_ascii_from_fixed PNGARG((png_structp png_ptr, |
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png_charp ascii, png_size_t size, png_fixed_point fp)); |
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#endif /* FIXED_POINT */ |
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#endif /* READ_sCAL */ |
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#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) |
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/* An internal API to validate the format of a floating point number. |
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* The result is the index of the next character. If the number is |
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* not valid it will be the index of a character in the supposed number. |
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* |
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* The format of a number is defined in the PNG extensions specification |
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* and this API is strictly conformant to that spec, not anyone elses! |
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* |
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* The format as a regular expression is: |
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* |
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* [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? |
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* |
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* or: |
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* |
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* [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? |
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* |
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* The complexity is that either integer or fraction must be present and the |
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* fraction is permitted to have no digits only if the integer is present. |
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* |
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* NOTE: The dangling E problem. |
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* There is a PNG valid floating point number in the following: |
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* |
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* PNG floating point numb1.ers are not greedy. |
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* |
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* Working this out requires *TWO* character lookahead (because of the |
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* sign), the parser does not do this - it will fail at the 'r' - this |
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* doesn't matter for PNG sCAL chunk values, but it requires more care |
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* if the value were ever to be embedded in something more complex. Use |
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* ANSI-C strtod if you need the lookahead. |
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*/ |
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/* State table for the parser. */ |
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#define PNG_FP_INTEGER 0 /* before or in integer */ |
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#define PNG_FP_FRACTION 1 /* before or in fraction */ |
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#define PNG_FP_EXPONENT 2 /* before or in exponent */ |
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#define PNG_FP_STATE 3 /* mask for the above */ |
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#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ |
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#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ |
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#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ |
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#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ |
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#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ |
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/* These three values don't affect the parser. They are set but not used. |
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*/ |
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#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ |
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#define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ |
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#define PNG_FP_NONZERO 256 /* A non-zero value */ |
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#define PNG_FP_STICKY 448 /* The above three flags */ |
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/* This is available for the caller to store in 'state' if required. Do not |
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* call the parser after setting it (the parser sometimes clears it.) |
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*/ |
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#define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ |
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|
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/* Result codes for the parser (boolean - true meants ok, false means |
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* not ok yet.) |
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*/ |
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#define PNG_FP_MAYBE 0 /* The number may be valid in the future */ |
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#define PNG_FP_OK 1 /* The number is valid */ |
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/* Tests on the sticky non-zero and negative flags. To pass these checks |
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* the state must also indicate that the whole number is valid - this is |
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* achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this |
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* is equivalent to PNG_FP_OK above.) |
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*/ |
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#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) |
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/* NZ_MASK: the string is valid and a non-zero negative value */ |
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#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) |
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/* Z MASK: the string is valid and a non-zero value. */ |
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/* PNG_FP_SAW_DIGIT: the string is valid. */ |
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#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) |
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#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) |
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#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) |
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/* The actual parser. This can be called repeatedly, it updates |
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* the index into the string and the state variable (which must |
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* be initialzed to 0). It returns a result code, as above. There |
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* is no point calling the parser any more if it fails to advance to |
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* the end of the string - it is stuck on an invalid character (or |
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* terminated by '\0'). |
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* |
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* Note that the pointer will consume an E or even an E+ then leave |
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* a 'maybe' state even though a preceding integer.fraction is valid. |
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* The PNG_FP_WAS_VALID flag indicates that a preceding substring was |
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* a valid number. It's possible to recover from this by calling |
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* the parser again (from the start, with state 0) but with a string |
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* that omits the last character (i.e. set the size to the index of |
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* the problem character.) This has not been tested within libpng. |
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*/ |
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PNG_EXTERN int png_check_fp_number PNGARG((png_const_charp string, |
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png_size_t size, int *statep, png_size_tp whereami)); |
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|
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/* 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 |
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* function also returns the state at the end of parsing the number if |
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* it was valid (otherwise it returns 0.) This can be used for testing |
|
* for negative or zero values using the sticky flag. |
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*/ |
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PNG_EXTERN int png_check_fp_string PNGARG((png_const_charp string, |
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png_size_t size)); |
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#endif /* pCAL || sCAL */ |
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#if defined(PNG_READ_GAMMA_SUPPORTED) ||\ |
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defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) |
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/* 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. |
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*/ |
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PNG_EXTERN int png_muldiv PNGARG((png_fixed_point_p res, png_fixed_point a, |
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png_int_32 multiplied_by, png_int_32 divided_by)); |
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#endif |
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#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) |
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/* Same deal, but issue a warning on overflow and return 0. */ |
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PNG_EXTERN png_fixed_point png_muldiv_warn PNGARG((png_structp png_ptr, |
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png_fixed_point a, png_int_32 multiplied_by, png_int_32 divided_by)); |
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#endif |
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|
|
#ifdef PNG_READ_GAMMA_SUPPORTED |
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/* Calculate a reciprocal - used for gamma values. This returns |
|
* 0 if the argument is 0 in order to maintain an undefined value, |
|
* there are no warnings. |
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*/ |
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PNG_EXTERN png_fixed_point png_reciprocal PNGARG((png_fixed_point a)); |
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|
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/* The same but gives a reciprocal of the product of two fixed point |
|
* values. Accuracy is suitable for gamma calculations but this is |
|
* not exact - use png_muldiv for that. |
|
*/ |
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PNG_EXTERN png_fixed_point png_reciprocal2 PNGARG((png_fixed_point a, |
|
png_fixed_point b)); |
|
#endif |
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|
|
#ifdef PNG_READ_GAMMA_SUPPORTED |
|
/* Internal fixed point gamma correction. These APIs are called as |
|
* required to convert single values - they don't need to be fast, |
|
* they are not used when processing image pixel values. |
|
* |
|
* While the input is an 'unsigned' value it must actually be the |
|
* correct bit value - 0..255 or 0..65535 as required. |
|
*/ |
|
PNG_EXTERN png_uint_16 png_gamma_correct PNGARG((png_structp png_ptr, |
|
unsigned int value, png_fixed_point gamma_value)); |
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PNG_EXTERN int png_gamma_significant PNGARG((png_fixed_point gamma_value)); |
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PNG_EXTERN png_uint_16 png_gamma_16bit_correct PNGARG((unsigned int value, |
|
png_fixed_point gamma_value)); |
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PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned int value, |
|
png_fixed_point gamma_value)); |
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PNG_EXTERN void png_destroy_gamma_table(png_structp png_ptr); |
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PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr, |
|
int bit_depth)); |
|
#endif |
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|
|
/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ |
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|
|
#include "pngdebug.h" |
|
|
|
#ifdef __cplusplus |
|
} |
|
#endif |
|
|
|
#endif /* PNGPRIV_H */
|
|
|