618 lines
22 KiB
C
618 lines
22 KiB
C
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/* pngconf.h - machine configurable file for libpng
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*
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* libpng version 1.5.4beta02 - June 14, 2011
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*
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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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* 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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*/
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/* Any machine specific code is near the front of this file, so if you
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* are configuring libpng for a machine, you may want to read the section
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* starting here down to where it starts to typedef png_color, png_text,
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* and png_info.
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*/
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#ifndef PNGCONF_H
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#define PNGCONF_H
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#ifndef PNG_BUILDING_SYMBOL_TABLE
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/* PNG_NO_LIMITS_H may be used to turn off the use of the standard C
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* definition file for machine specific limits, this may impact the
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* correctness of the definitons below (see uses of INT_MAX).
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*/
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# ifndef PNG_NO_LIMITS_H
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# include <limits.h>
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# endif
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/* For the memory copy APIs (i.e. the standard definitions of these),
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* because this file defines png_memcpy and so on the base APIs must
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* be defined here.
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*/
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# ifdef BSD
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# include <strings.h>
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# else
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# include <string.h>
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# endif
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/* For png_FILE_p - this provides the standard definition of a
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* FILE
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*/
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# ifdef PNG_STDIO_SUPPORTED
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# include <stdio.h>
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# endif
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#endif
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/* This controls optimization of the reading of 16 and 32 bit values
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* from PNG files. It can be set on a per-app-file basis - it
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* just changes whether a macro is used to the function is called.
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* The library builder sets the default, if read functions are not
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* built into the library the macro implementation is forced on.
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*/
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#ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED
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# define PNG_USE_READ_MACROS
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#endif
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#if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS)
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# if PNG_DEFAULT_READ_MACROS
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# define PNG_USE_READ_MACROS
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# endif
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#endif
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/* COMPILER SPECIFIC OPTIONS.
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*
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* These options are provided so that a variety of difficult compilers
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* can be used. Some are fixed at build time (e.g. PNG_API_RULE
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* below) but still have compiler specific implementations, others
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* may be changed on a per-file basis when compiling against libpng.
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*/
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/* The PNGARG macro protects us against machines that don't have function
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* prototypes (ie K&R style headers). If your compiler does not handle
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* function prototypes, define this macro and use the included ansi2knr.
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* I've always been able to use _NO_PROTO as the indicator, but you may
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* need to drag the empty declaration out in front of here, or change the
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* ifdef to suit your own needs.
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*/
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#ifndef PNGARG
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# ifdef OF /* zlib prototype munger */
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# define PNGARG(arglist) OF(arglist)
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# else
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# ifdef _NO_PROTO
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# define PNGARG(arglist) ()
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# else
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# define PNGARG(arglist) arglist
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# endif /* _NO_PROTO */
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# endif /* OF */
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#endif /* PNGARG */
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/* Function calling conventions.
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* =============================
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* Normally it is not necessary to specify to the compiler how to call
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* a function - it just does it - however on x86 systems derived from
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* Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems
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* and some others) there are multiple ways to call a function and the
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* default can be changed on the compiler command line. For this reason
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* libpng specifies the calling convention of every exported function and
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* every function called via a user supplied function pointer. This is
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* done in this file by defining the following macros:
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*
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* PNGAPI Calling convention for exported functions.
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* PNGCBAPI Calling convention for user provided (callback) functions.
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* PNGCAPI Calling convention used by the ANSI-C library (required
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* for longjmp callbacks and sometimes used internally to
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* specify the calling convention for zlib).
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*
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* These macros should never be overridden. If it is necessary to
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* change calling convention in a private build this can be done
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* by setting PNG_API_RULE (which defaults to 0) to one of the values
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* below to select the correct 'API' variants.
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*
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* PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout.
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* This is correct in every known environment.
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* PNG_API_RULE=1 Use the operating system convention for PNGAPI and
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* the 'C' calling convention (from PNGCAPI) for
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* callbacks (PNGCBAPI). This is no longer required
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* in any known environment - if it has to be used
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* please post an explanation of the problem to the
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* libpng mailing list.
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*
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* These cases only differ if the operating system does not use the C
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* calling convention, at present this just means the above cases
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* (x86 DOS/Windows sytems) and, even then, this does not apply to
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* Cygwin running on those systems.
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*
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* Note that the value must be defined in pnglibconf.h so that what
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* the application uses to call the library matches the conventions
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* set when building the library.
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*/
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/* Symbol export
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* =============
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* When building a shared library it is almost always necessary to tell
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* the compiler which symbols to export. The png.h macro 'PNG_EXPORT'
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* is used to mark the symbols. On some systems these symbols can be
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* extracted at link time and need no special processing by the compiler,
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* on other systems the symbols are flagged by the compiler and just
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* the declaration requires a special tag applied (unfortunately) in a
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* compiler dependent way. Some systems can do either.
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*
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* A small number of older systems also require a symbol from a DLL to
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* be flagged to the program that calls it. This is a problem because
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* we do not know in the header file included by application code that
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* the symbol will come from a shared library, as opposed to a statically
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* linked one. For this reason the application must tell us by setting
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* the magic flag PNG_USE_DLL to turn on the special processing before
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* it includes png.h.
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*
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* Four additional macros are used to make this happen:
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*
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* PNG_IMPEXP The magic (if any) to cause a symbol to be exported from
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* the build or imported if PNG_USE_DLL is set - compiler
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* and system specific.
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*
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* PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to
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* 'type', compiler specific.
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*
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* PNG_DLL_EXPORT Set to the magic to use during a libpng build to
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* make a symbol exported from the DLL.
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*
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* PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come
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* from a DLL - used to define PNG_IMPEXP when
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* PNG_USE_DLL is set.
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*/
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/* System specific discovery.
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* ==========================
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* This code is used at build time to find PNG_IMPEXP, the API settings
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* and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL
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* import processing is possible. On Windows/x86 systems it also sets
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* compiler-specific macros to the values required to change the calling
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* conventions of the various functions.
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*/
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#if ( defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\
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defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) ) &&\
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( defined(_X86_) || defined(_X64_) || defined(_M_IX86) ||\
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defined(_M_X64) || defined(_M_IA64) )
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/* Windows system (DOS doesn't support DLLs) running on x86/x64. Includes
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* builds under Cygwin or MinGW. Also includes Watcom builds but these need
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* special treatment because they are not compatible with GCC or Visual C
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* because of different calling conventions.
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*/
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# if PNG_API_RULE == 2
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/* If this line results in an error, either because __watcall is not
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* understood or because of a redefine just below you cannot use *this*
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* build of the library with the compiler you are using. *This* build was
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* build using Watcom and applications must also be built using Watcom!
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*/
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# define PNGCAPI __watcall
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# endif
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# if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
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# define PNGCAPI __cdecl
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# if PNG_API_RULE == 1
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# define PNGAPI __stdcall
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# endif
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# else
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/* An older compiler, or one not detected (erroneously) above,
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* if necessary override on the command line to get the correct
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* variants for the compiler.
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*/
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# ifndef PNGCAPI
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# define PNGCAPI _cdecl
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# endif
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# if PNG_API_RULE == 1 && !defined(PNGAPI)
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# define PNGAPI _stdcall
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# endif
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# endif /* compiler/api */
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/* NOTE: PNGCBAPI always defaults to PNGCAPI. */
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# if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD)
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ERROR: PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed
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# endif
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# if (defined(_MSC_VER) && _MSC_VER < 800) ||\
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(defined(__BORLANDC__) && __BORLANDC__ < 0x500)
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/* older Borland and MSC
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* compilers used '__export' and required this to be after
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* the type.
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*/
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# ifndef PNG_EXPORT_TYPE
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# define PNG_EXPORT_TYPE(type) type PNG_IMPEXP
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# endif
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# define PNG_DLL_EXPORT __export
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# else /* newer compiler */
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# define PNG_DLL_EXPORT __declspec(dllexport)
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# ifndef PNG_DLL_IMPORT
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# define PNG_DLL_IMPORT __declspec(dllimport)
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# endif
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# endif /* compiler */
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#else /* !Windows/x86 */
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# if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
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# define PNGAPI _System
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# else /* !Windows/x86 && !OS/2 */
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/* Use the defaults, or define PNG*API on the command line (but
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* this will have to be done for every compile!)
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*/
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# endif /* other system, !OS/2 */
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#endif /* !Windows/x86 */
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/* Now do all the defaulting . */
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#ifndef PNGCAPI
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# define PNGCAPI
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#endif
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#ifndef PNGCBAPI
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# define PNGCBAPI PNGCAPI
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#endif
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#ifndef PNGAPI
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# define PNGAPI PNGCAPI
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#endif
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/* The default for PNG_IMPEXP depends on whether the library is
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* being built or used.
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*/
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#ifndef PNG_IMPEXP
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# ifdef PNGLIB_BUILD
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/* Building the library */
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# if (defined(DLL_EXPORT)/*from libtool*/ ||\
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defined(_WINDLL) || defined(_DLL) || defined(__DLL__) ||\
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defined(_USRDLL) ||\
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defined(PNG_BUILD_DLL)) && defined(PNG_DLL_EXPORT)
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/* Building a DLL. */
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# define PNG_IMPEXP PNG_DLL_EXPORT
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# endif /* DLL */
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# else
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/* Using the library */
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# if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT)
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/* This forces use of a DLL, disallowing static linking */
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# define PNG_IMPEXP PNG_DLL_IMPORT
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# endif
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# endif
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# ifndef PNG_IMPEXP
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# define PNG_IMPEXP
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# endif
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#endif
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/* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat
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* 'attributes' as a storage class - the attributes go at the start of the
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* function definition, and attributes are always appended regardless of the
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* compiler. This considerably simplifies these macros but may cause problems
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* if any compilers both need function attributes and fail to handle them as
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* a storage class (this is unlikely.)
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*/
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#ifndef PNG_FUNCTION
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# define PNG_FUNCTION(type, name, args, attributes) attributes type name args
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#endif
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#ifndef PNG_EXPORT_TYPE
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# define PNG_EXPORT_TYPE(type) PNG_IMPEXP type
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#endif
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/* The ordinal value is only relevant when preprocessing png.h for symbol
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* table entries, so we discard it here. See the .dfn files in the
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* scripts directory.
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*/
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#ifndef PNG_EXPORTA
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# define PNG_EXPORTA(ordinal, type, name, args, attributes)\
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PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args), \
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extern attributes)
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#endif
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/* ANSI-C (C90) does not permit a macro to be invoked with an empty argument,
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* so make something non-empty to satisfy the requirement:
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*/
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#define PNG_EMPTY /*empty list*/
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#define PNG_EXPORT(ordinal, type, name, args)\
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PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY)
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/* Use PNG_REMOVED to comment out a removed interface. */
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#ifndef PNG_REMOVED
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# define PNG_REMOVED(ordinal, type, name, args, attributes)
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#endif
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#ifndef PNG_CALLBACK
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# define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args)
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#endif
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/* Support for compiler specific function attributes. These are used
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* so that where compiler support is available incorrect use of API
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* functions in png.h will generate compiler warnings.
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*
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* Added at libpng-1.2.41.
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*/
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#ifndef PNG_NO_PEDANTIC_WARNINGS
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# ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
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# define PNG_PEDANTIC_WARNINGS_SUPPORTED
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# endif
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#endif
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#ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
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/* Support for compiler specific function attributes. These are used
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* so that where compiler support is available incorrect use of API
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* functions in png.h will generate compiler warnings. Added at libpng
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* version 1.2.41.
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*/
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# if defined(__GNUC__)
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# ifndef PNG_USE_RESULT
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# define PNG_USE_RESULT __attribute__((__warn_unused_result__))
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# endif
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# ifndef PNG_NORETURN
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# define PNG_NORETURN __attribute__((__noreturn__))
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# endif
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# ifndef PNG_ALLOCATED
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# define PNG_ALLOCATED __attribute__((__malloc__))
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# endif
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/* This specifically protects structure members that should only be
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* accessed from within the library, therefore should be empty during
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* a library build.
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*/
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# ifndef PNGLIB_BUILD
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# ifndef PNG_DEPRECATED
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# define PNG_DEPRECATED __attribute__((__deprecated__))
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# endif
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# ifndef PNG_PRIVATE
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# if 0 /* Doesn't work so we use deprecated instead*/
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# define PNG_PRIVATE \
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__attribute__((warning("This function is not exported by libpng.")))
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# else
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# define PNG_PRIVATE \
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__attribute__((__deprecated__))
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# endif
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# endif
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# endif /* PNGLIB_BUILD */
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# endif /* __GNUC__ */
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# if defined(_MSC_VER) && (_MSC_VER >= 1300)
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# ifndef PNG_USE_RESULT
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# define PNG_USE_RESULT /* not supported */
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# endif
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# ifndef PNG_NORETURN
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# define PNG_NORETURN __declspec(noreturn)
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# endif
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# ifndef PNG_ALLOCATED
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# define PNG_ALLOCATED __declspec(restrict)
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# endif
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/* This specifically protects structure members that should only be
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* accessed from within the library, therefore should be empty during
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* a library build.
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*/
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# ifndef PNGLIB_BUILD
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# ifndef PNG_DEPRECATED
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# define PNG_DEPRECATED __declspec(deprecated)
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# endif
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# ifndef PNG_PRIVATE
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# define PNG_PRIVATE __declspec(deprecated)
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# endif
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# endif /* PNGLIB_BUILD */
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# endif /* _MSC_VER */
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#endif /* PNG_PEDANTIC_WARNINGS */
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#ifndef PNG_DEPRECATED
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# define PNG_DEPRECATED /* Use of this function is deprecated */
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#endif
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#ifndef PNG_USE_RESULT
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# define PNG_USE_RESULT /* The result of this function must be checked */
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#endif
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#ifndef PNG_NORETURN
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# define PNG_NORETURN /* This function does not return */
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#endif
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#ifndef PNG_ALLOCATED
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# define PNG_ALLOCATED /* The result of the function is new memory */
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#endif
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#ifndef PNG_PRIVATE
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# define PNG_PRIVATE /* This is a private libpng function */
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#endif
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#ifndef PNG_FP_EXPORT /* A floating point API. */
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# ifdef PNG_FLOATING_POINT_SUPPORTED
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# define PNG_FP_EXPORT(ordinal, type, name, args)\
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PNG_EXPORT(ordinal, type, name, args)
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# else /* No floating point APIs */
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# define PNG_FP_EXPORT(ordinal, type, name, args)
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# endif
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#endif
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#ifndef PNG_FIXED_EXPORT /* A fixed point API. */
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# ifdef PNG_FIXED_POINT_SUPPORTED
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# define PNG_FIXED_EXPORT(ordinal, type, name, args)\
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PNG_EXPORT(ordinal, type, name, args)
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# else /* No fixed point APIs */
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# define PNG_FIXED_EXPORT(ordinal, type, name, args)
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# endif
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#endif
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/* The following uses const char * instead of char * for error
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* and warning message functions, so some compilers won't complain.
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* If you do not want to use const, define PNG_NO_CONST here.
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*
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* This should not change how the APIs are called, so it can be done
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* on a per-file basis in the application.
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*/
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#ifndef PNG_CONST
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# ifndef PNG_NO_CONST
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# define PNG_CONST const
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# else
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# define PNG_CONST
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# endif
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#endif
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/* Some typedefs to get us started. These should be safe on most of the
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* common platforms. The typedefs should be at least as large as the
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* numbers suggest (a png_uint_32 must be at least 32 bits long), but they
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* don't have to be exactly that size. Some compilers dislike passing
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* unsigned shorts as function parameters, so you may be better off using
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* unsigned int for png_uint_16.
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*/
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#if defined(INT_MAX) && (INT_MAX > 0x7ffffffeL)
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typedef unsigned int png_uint_32;
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typedef int png_int_32;
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#else
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typedef unsigned long png_uint_32;
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typedef long png_int_32;
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#endif
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typedef unsigned short png_uint_16;
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typedef short png_int_16;
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typedef unsigned char png_byte;
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#ifdef PNG_NO_SIZE_T
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typedef unsigned int png_size_t;
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#else
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typedef size_t png_size_t;
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#endif
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#define png_sizeof(x) (sizeof (x))
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/* The following is needed for medium model support. It cannot be in the
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* pngpriv.h header. Needs modification for other compilers besides
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* MSC. Model independent support declares all arrays and pointers to be
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* large using the far keyword. The zlib version used must also support
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* model independent data. As of version zlib 1.0.4, the necessary changes
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* have been made in zlib. The USE_FAR_KEYWORD define triggers other
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* changes that are needed. (Tim Wegner)
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*/
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/* Separate compiler dependencies (problem here is that zlib.h always
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* defines FAR. (SJT)
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*/
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#ifdef __BORLANDC__
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# if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__)
|
|
# define LDATA 1
|
|
# else
|
|
# define LDATA 0
|
|
# endif
|
|
/* GRR: why is Cygwin in here? Cygwin is not Borland C... */
|
|
# if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__)
|
|
# define PNG_MAX_MALLOC_64K /* only used in build */
|
|
# if (LDATA != 1)
|
|
# ifndef FAR
|
|
# define FAR __far
|
|
# endif
|
|
# define USE_FAR_KEYWORD
|
|
# endif /* LDATA != 1 */
|
|
/* Possibly useful for moving data out of default segment.
|
|
* Uncomment it if you want. Could also define FARDATA as
|
|
* const if your compiler supports it. (SJT)
|
|
# define FARDATA FAR
|
|
*/
|
|
# endif /* __WIN32__, __FLAT__, __CYGWIN__ */
|
|
#endif /* __BORLANDC__ */
|
|
|
|
|
|
/* Suggest testing for specific compiler first before testing for
|
|
* FAR. The Watcom compiler defines both __MEDIUM__ and M_I86MM,
|
|
* making reliance oncertain keywords suspect. (SJT)
|
|
*/
|
|
|
|
/* MSC Medium model */
|
|
#ifdef FAR
|
|
# ifdef M_I86MM
|
|
# define USE_FAR_KEYWORD
|
|
# define FARDATA FAR
|
|
# include <dos.h>
|
|
# endif
|
|
#endif
|
|
|
|
/* SJT: default case */
|
|
#ifndef FAR
|
|
# define FAR
|
|
#endif
|
|
|
|
/* At this point FAR is always defined */
|
|
#ifndef FARDATA
|
|
# define FARDATA
|
|
#endif
|
|
|
|
/* Typedef for floating-point numbers that are converted
|
|
* to fixed-point with a multiple of 100,000, e.g., gamma
|
|
*/
|
|
typedef png_int_32 png_fixed_point;
|
|
|
|
/* Add typedefs for pointers */
|
|
typedef void FAR * png_voidp;
|
|
typedef PNG_CONST void FAR * png_const_voidp;
|
|
typedef png_byte FAR * png_bytep;
|
|
typedef PNG_CONST png_byte FAR * png_const_bytep;
|
|
typedef png_uint_32 FAR * png_uint_32p;
|
|
typedef PNG_CONST png_uint_32 FAR * png_const_uint_32p;
|
|
typedef png_int_32 FAR * png_int_32p;
|
|
typedef PNG_CONST png_int_32 FAR * png_const_int_32p;
|
|
typedef png_uint_16 FAR * png_uint_16p;
|
|
typedef PNG_CONST png_uint_16 FAR * png_const_uint_16p;
|
|
typedef png_int_16 FAR * png_int_16p;
|
|
typedef PNG_CONST png_int_16 FAR * png_const_int_16p;
|
|
typedef char FAR * png_charp;
|
|
typedef PNG_CONST char FAR * png_const_charp;
|
|
typedef png_fixed_point FAR * png_fixed_point_p;
|
|
typedef PNG_CONST png_fixed_point FAR * png_const_fixed_point_p;
|
|
typedef png_size_t FAR * png_size_tp;
|
|
typedef PNG_CONST png_size_t FAR * png_const_size_tp;
|
|
|
|
#ifdef PNG_STDIO_SUPPORTED
|
|
typedef FILE * png_FILE_p;
|
|
#endif
|
|
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
typedef double FAR * png_doublep;
|
|
typedef PNG_CONST double FAR * png_const_doublep;
|
|
#endif
|
|
|
|
/* Pointers to pointers; i.e. arrays */
|
|
typedef png_byte FAR * FAR * png_bytepp;
|
|
typedef png_uint_32 FAR * FAR * png_uint_32pp;
|
|
typedef png_int_32 FAR * FAR * png_int_32pp;
|
|
typedef png_uint_16 FAR * FAR * png_uint_16pp;
|
|
typedef png_int_16 FAR * FAR * png_int_16pp;
|
|
typedef PNG_CONST char FAR * FAR * png_const_charpp;
|
|
typedef char FAR * FAR * png_charpp;
|
|
typedef png_fixed_point FAR * FAR * png_fixed_point_pp;
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
typedef double FAR * FAR * png_doublepp;
|
|
#endif
|
|
|
|
/* Pointers to pointers to pointers; i.e., pointer to array */
|
|
typedef char FAR * FAR * FAR * png_charppp;
|
|
|
|
/* png_alloc_size_t is guaranteed to be no smaller than png_size_t,
|
|
* and no smaller than png_uint_32. Casts from png_size_t or png_uint_32
|
|
* to png_alloc_size_t are not necessary; in fact, it is recommended
|
|
* not to use them at all so that the compiler can complain when something
|
|
* turns out to be problematic.
|
|
* Casts in the other direction (from png_alloc_size_t to png_size_t or
|
|
* png_uint_32) should be explicitly applied; however, we do not expect
|
|
* to encounter practical situations that require such conversions.
|
|
*/
|
|
#if defined(__TURBOC__) && !defined(__FLAT__)
|
|
typedef unsigned long png_alloc_size_t;
|
|
#else
|
|
# if defined(_MSC_VER) && defined(MAXSEG_64K)
|
|
typedef unsigned long png_alloc_size_t;
|
|
# else
|
|
/* This is an attempt to detect an old Windows system where (int) is
|
|
* actually 16 bits, in that case png_malloc must have an argument with a
|
|
* bigger size to accomodate the requirements of the library.
|
|
*/
|
|
# if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) && \
|
|
(!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL)
|
|
typedef DWORD png_alloc_size_t;
|
|
# else
|
|
typedef png_size_t png_alloc_size_t;
|
|
# endif
|
|
# endif
|
|
#endif
|
|
|
|
#endif /* PNGCONF_H */
|