michael@0: 
michael@0: /* pngconf.h - machine configurable file for libpng
michael@0:  *
michael@0:  * libpng version 1.6.10 - March 6, 2014
michael@0:  *
michael@0:  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
michael@0:  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
michael@0:  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
michael@0:  *
michael@0:  * This code is released under the libpng license.
michael@0:  * For conditions of distribution and use, see the disclaimer
michael@0:  * and license in png.h
michael@0:  *
michael@0:  */
michael@0: 
michael@0: /* Any machine specific code is near the front of this file, so if you
michael@0:  * are configuring libpng for a machine, you may want to read the section
michael@0:  * starting here down to where it starts to typedef png_color, png_text,
michael@0:  * and png_info.
michael@0:  */
michael@0: 
michael@0: #ifndef PNGCONF_H
michael@0: #define PNGCONF_H
michael@0: 
michael@0: /* To do: Do all of this in scripts/pnglibconf.dfa */
michael@0: #ifdef PNG_SAFE_LIMITS_SUPPORTED
michael@0: #  ifdef PNG_USER_WIDTH_MAX
michael@0: #    undef PNG_USER_WIDTH_MAX
michael@0: #    define PNG_USER_WIDTH_MAX 1000000L
michael@0: #  endif
michael@0: #  ifdef PNG_USER_HEIGHT_MAX
michael@0: #    undef PNG_USER_HEIGHT_MAX
michael@0: #    define PNG_USER_HEIGHT_MAX 1000000L
michael@0: #  endif
michael@0: #  ifdef PNG_USER_CHUNK_MALLOC_MAX
michael@0: #    undef PNG_USER_CHUNK_MALLOC_MAX
michael@0: #    define PNG_USER_CHUNK_MALLOC_MAX 4000000L
michael@0: #  endif
michael@0: #  ifdef PNG_USER_CHUNK_CACHE_MAX
michael@0: #    undef PNG_USER_CHUNK_CACHE_MAX
michael@0: #    define PNG_USER_CHUNK_CACHE_MAX 128
michael@0: #  endif
michael@0: #endif
michael@0: 
michael@0: #ifndef PNG_BUILDING_SYMBOL_TABLE /* else includes may cause problems */
michael@0: 
michael@0: /* From libpng 1.6.0 libpng requires an ANSI X3.159-1989 ("ISOC90") compliant C
michael@0:  * compiler for correct compilation.  The following header files are required by
michael@0:  * the standard.  If your compiler doesn't provide these header files, or they
michael@0:  * do not match the standard, you will need to provide/improve them.
michael@0:  */
michael@0: #include <limits.h>
michael@0: #include <stddef.h>
michael@0: 
michael@0: /* Library header files.  These header files are all defined by ISOC90; libpng
michael@0:  * expects conformant implementations, however, an ISOC90 conformant system need
michael@0:  * not provide these header files if the functionality cannot be implemented.
michael@0:  * In this case it will be necessary to disable the relevant parts of libpng in
michael@0:  * the build of pnglibconf.h.
michael@0:  *
michael@0:  * Prior to 1.6.0 string.h was included here; the API changes in 1.6.0 to not
michael@0:  * include this unnecessary header file.
michael@0:  */
michael@0: 
michael@0: #ifdef PNG_STDIO_SUPPORTED
michael@0:    /* Required for the definition of FILE: */
michael@0: #  include <stdio.h>
michael@0: #endif
michael@0: 
michael@0: #ifdef PNG_SETJMP_SUPPORTED
michael@0:    /* Required for the definition of jmp_buf and the declaration of longjmp: */
michael@0: #  include <setjmp.h>
michael@0: #endif
michael@0: 
michael@0: #ifdef PNG_CONVERT_tIME_SUPPORTED
michael@0:    /* Required for struct tm: */
michael@0: #  include <time.h>
michael@0: #endif
michael@0: 
michael@0: #endif /* PNG_BUILDING_SYMBOL_TABLE */
michael@0: 
michael@0: /* Prior to 1.6.0 it was possible to turn off 'const' in declarations using
michael@0:  * PNG_NO_CONST; this is no longer supported except for data declarations which
michael@0:  * apparently still cause problems in 2011 on some compilers.
michael@0:  */
michael@0: #define PNG_CONST const /* backward compatibility only */
michael@0: 
michael@0: /* This controls optimization of the reading of 16 and 32 bit values
michael@0:  * from PNG files.  It can be set on a per-app-file basis - it
michael@0:  * just changes whether a macro is used when the function is called.
michael@0:  * The library builder sets the default; if read functions are not
michael@0:  * built into the library the macro implementation is forced on.
michael@0:  */
michael@0: #ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED
michael@0: #  define PNG_USE_READ_MACROS
michael@0: #endif
michael@0: #if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS)
michael@0: #  if PNG_DEFAULT_READ_MACROS
michael@0: #    define PNG_USE_READ_MACROS
michael@0: #  endif
michael@0: #endif
michael@0: 
michael@0: /* COMPILER SPECIFIC OPTIONS.
michael@0:  *
michael@0:  * These options are provided so that a variety of difficult compilers
michael@0:  * can be used.  Some are fixed at build time (e.g. PNG_API_RULE
michael@0:  * below) but still have compiler specific implementations, others
michael@0:  * may be changed on a per-file basis when compiling against libpng.
michael@0:  */
michael@0: 
michael@0: /* The PNGARG macro was used in versions of libpng prior to 1.6.0 to protect
michael@0:  * against legacy (pre ISOC90) compilers that did not understand function
michael@0:  * prototypes.  It is not required for modern C compilers.
michael@0:  */
michael@0: #ifndef PNGARG
michael@0: #  define PNGARG(arglist) arglist
michael@0: #endif
michael@0: 
michael@0: /* Function calling conventions.
michael@0:  * =============================
michael@0:  * Normally it is not necessary to specify to the compiler how to call
michael@0:  * a function - it just does it - however on x86 systems derived from
michael@0:  * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems
michael@0:  * and some others) there are multiple ways to call a function and the
michael@0:  * default can be changed on the compiler command line.  For this reason
michael@0:  * libpng specifies the calling convention of every exported function and
michael@0:  * every function called via a user supplied function pointer.  This is
michael@0:  * done in this file by defining the following macros:
michael@0:  *
michael@0:  * PNGAPI    Calling convention for exported functions.
michael@0:  * PNGCBAPI  Calling convention for user provided (callback) functions.
michael@0:  * PNGCAPI   Calling convention used by the ANSI-C library (required
michael@0:  *           for longjmp callbacks and sometimes used internally to
michael@0:  *           specify the calling convention for zlib).
michael@0:  *
michael@0:  * These macros should never be overridden.  If it is necessary to
michael@0:  * change calling convention in a private build this can be done
michael@0:  * by setting PNG_API_RULE (which defaults to 0) to one of the values
michael@0:  * below to select the correct 'API' variants.
michael@0:  *
michael@0:  * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout.
michael@0:  *                This is correct in every known environment.
michael@0:  * PNG_API_RULE=1 Use the operating system convention for PNGAPI and
michael@0:  *                the 'C' calling convention (from PNGCAPI) for
michael@0:  *                callbacks (PNGCBAPI).  This is no longer required
michael@0:  *                in any known environment - if it has to be used
michael@0:  *                please post an explanation of the problem to the
michael@0:  *                libpng mailing list.
michael@0:  *
michael@0:  * These cases only differ if the operating system does not use the C
michael@0:  * calling convention, at present this just means the above cases
michael@0:  * (x86 DOS/Windows sytems) and, even then, this does not apply to
michael@0:  * Cygwin running on those systems.
michael@0:  *
michael@0:  * Note that the value must be defined in pnglibconf.h so that what
michael@0:  * the application uses to call the library matches the conventions
michael@0:  * set when building the library.
michael@0:  */
michael@0: 
michael@0: /* Symbol export
michael@0:  * =============
michael@0:  * When building a shared library it is almost always necessary to tell
michael@0:  * the compiler which symbols to export.  The png.h macro 'PNG_EXPORT'
michael@0:  * is used to mark the symbols.  On some systems these symbols can be
michael@0:  * extracted at link time and need no special processing by the compiler,
michael@0:  * on other systems the symbols are flagged by the compiler and just
michael@0:  * the declaration requires a special tag applied (unfortunately) in a
michael@0:  * compiler dependent way.  Some systems can do either.
michael@0:  *
michael@0:  * A small number of older systems also require a symbol from a DLL to
michael@0:  * be flagged to the program that calls it.  This is a problem because
michael@0:  * we do not know in the header file included by application code that
michael@0:  * the symbol will come from a shared library, as opposed to a statically
michael@0:  * linked one.  For this reason the application must tell us by setting
michael@0:  * the magic flag PNG_USE_DLL to turn on the special processing before
michael@0:  * it includes png.h.
michael@0:  *
michael@0:  * Four additional macros are used to make this happen:
michael@0:  *
michael@0:  * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from
michael@0:  *            the build or imported if PNG_USE_DLL is set - compiler
michael@0:  *            and system specific.
michael@0:  *
michael@0:  * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to
michael@0:  *                       'type', compiler specific.
michael@0:  *
michael@0:  * PNG_DLL_EXPORT Set to the magic to use during a libpng build to
michael@0:  *                make a symbol exported from the DLL.  Not used in the
michael@0:  *                public header files; see pngpriv.h for how it is used
michael@0:  *                in the libpng build.
michael@0:  *
michael@0:  * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come
michael@0:  *                from a DLL - used to define PNG_IMPEXP when
michael@0:  *                PNG_USE_DLL is set.
michael@0:  */
michael@0: 
michael@0: /* System specific discovery.
michael@0:  * ==========================
michael@0:  * This code is used at build time to find PNG_IMPEXP, the API settings
michael@0:  * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL
michael@0:  * import processing is possible.  On Windows systems it also sets
michael@0:  * compiler-specific macros to the values required to change the calling
michael@0:  * conventions of the various functions.
michael@0:  */
michael@0: #if defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\
michael@0:     defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
michael@0:   /* Windows system (DOS doesn't support DLLs).  Includes builds under Cygwin or
michael@0:    * MinGW on any architecture currently supported by Windows.  Also includes
michael@0:    * Watcom builds but these need special treatment because they are not
michael@0:    * compatible with GCC or Visual C because of different calling conventions.
michael@0:    */
michael@0: #  if PNG_API_RULE == 2
michael@0:     /* If this line results in an error, either because __watcall is not
michael@0:      * understood or because of a redefine just below you cannot use *this*
michael@0:      * build of the library with the compiler you are using.  *This* build was
michael@0:      * build using Watcom and applications must also be built using Watcom!
michael@0:      */
michael@0: #    define PNGCAPI __watcall
michael@0: #  endif
michael@0: 
michael@0: #  if defined(__GNUC__) || (defined(_MSC_VER) && (_MSC_VER >= 800))
michael@0: #    define PNGCAPI __cdecl
michael@0: #    if PNG_API_RULE == 1
michael@0:        /* If this line results in an error __stdcall is not understood and
michael@0:         * PNG_API_RULE should not have been set to '1'.
michael@0:         */
michael@0: #      define PNGAPI __stdcall
michael@0: #    endif
michael@0: #  else
michael@0:     /* An older compiler, or one not detected (erroneously) above,
michael@0:      * if necessary override on the command line to get the correct
michael@0:      * variants for the compiler.
michael@0:      */
michael@0: #    ifndef PNGCAPI
michael@0: #      define PNGCAPI _cdecl
michael@0: #    endif
michael@0: #    if PNG_API_RULE == 1 && !defined(PNGAPI)
michael@0: #      define PNGAPI _stdcall
michael@0: #    endif
michael@0: #  endif /* compiler/api */
michael@0: 
michael@0:   /* NOTE: PNGCBAPI always defaults to PNGCAPI. */
michael@0: 
michael@0: #  if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD)
michael@0: #     error "PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed"
michael@0: #  endif
michael@0: 
michael@0: #  if (defined(_MSC_VER) && _MSC_VER < 800) ||\
michael@0:       (defined(__BORLANDC__) && __BORLANDC__ < 0x500)
michael@0:     /* older Borland and MSC
michael@0:      * compilers used '__export' and required this to be after
michael@0:      * the type.
michael@0:      */
michael@0: #    ifndef PNG_EXPORT_TYPE
michael@0: #      define PNG_EXPORT_TYPE(type) type PNG_IMPEXP
michael@0: #    endif
michael@0: #    define PNG_DLL_EXPORT __export
michael@0: #  else /* newer compiler */
michael@0: #    define PNG_DLL_EXPORT __declspec(dllexport)
michael@0: #    ifndef PNG_DLL_IMPORT
michael@0: #      define PNG_DLL_IMPORT __declspec(dllimport)
michael@0: #    endif
michael@0: #  endif /* compiler */
michael@0: 
michael@0: #else /* !Windows */
michael@0: #  if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
michael@0: #    define PNGAPI _System
michael@0: #  else /* !Windows/x86 && !OS/2 */
michael@0:     /* Use the defaults, or define PNG*API on the command line (but
michael@0:      * this will have to be done for every compile!)
michael@0:      */
michael@0: #  endif /* other system, !OS/2 */
michael@0: #endif /* !Windows/x86 */
michael@0: 
michael@0: /* Now do all the defaulting . */
michael@0: #ifndef PNGCAPI
michael@0: #  define PNGCAPI
michael@0: #endif
michael@0: #ifndef PNGCBAPI
michael@0: #  define PNGCBAPI PNGCAPI
michael@0: #endif
michael@0: #ifndef PNGAPI
michael@0: #  define PNGAPI PNGCAPI
michael@0: #endif
michael@0: 
michael@0: /* PNG_IMPEXP may be set on the compilation system command line or (if not set)
michael@0:  * then in an internal header file when building the library, otherwise (when
michael@0:  * using the library) it is set here.
michael@0:  */
michael@0: #ifndef PNG_IMPEXP
michael@0: #  if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT)
michael@0:      /* This forces use of a DLL, disallowing static linking */
michael@0: #    define PNG_IMPEXP PNG_DLL_IMPORT
michael@0: #  endif
michael@0: 
michael@0: #  ifndef PNG_IMPEXP
michael@0: #    define PNG_IMPEXP
michael@0: #  endif
michael@0: #endif
michael@0: 
michael@0: /* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat
michael@0:  * 'attributes' as a storage class - the attributes go at the start of the
michael@0:  * function definition, and attributes are always appended regardless of the
michael@0:  * compiler.  This considerably simplifies these macros but may cause problems
michael@0:  * if any compilers both need function attributes and fail to handle them as
michael@0:  * a storage class (this is unlikely.)
michael@0:  */
michael@0: #ifndef PNG_FUNCTION
michael@0: #  define PNG_FUNCTION(type, name, args, attributes) attributes type name args
michael@0: #endif
michael@0: 
michael@0: #ifndef PNG_EXPORT_TYPE
michael@0: #  define PNG_EXPORT_TYPE(type) PNG_IMPEXP type
michael@0: #endif
michael@0: 
michael@0:    /* The ordinal value is only relevant when preprocessing png.h for symbol
michael@0:     * table entries, so we discard it here.  See the .dfn files in the
michael@0:     * scripts directory.
michael@0:     */
michael@0: #ifndef PNG_EXPORTA
michael@0: 
michael@0: #  define PNG_EXPORTA(ordinal, type, name, args, attributes)\
michael@0:       PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args), \
michael@0:         extern attributes)
michael@0: #endif
michael@0: 
michael@0: /* ANSI-C (C90) does not permit a macro to be invoked with an empty argument,
michael@0:  * so make something non-empty to satisfy the requirement:
michael@0:  */
michael@0: #define PNG_EMPTY /*empty list*/
michael@0: 
michael@0: #define PNG_EXPORT(ordinal, type, name, args)\
michael@0:    PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY)
michael@0: 
michael@0: /* Use PNG_REMOVED to comment out a removed interface. */
michael@0: #ifndef PNG_REMOVED
michael@0: #  define PNG_REMOVED(ordinal, type, name, args, attributes)
michael@0: #endif
michael@0: 
michael@0: #ifndef PNG_CALLBACK
michael@0: #  define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args)
michael@0: #endif
michael@0: 
michael@0: /* Support for compiler specific function attributes.  These are used
michael@0:  * so that where compiler support is available incorrect use of API
michael@0:  * functions in png.h will generate compiler warnings.
michael@0:  *
michael@0:  * Added at libpng-1.2.41.
michael@0:  */
michael@0: 
michael@0: #ifndef PNG_NO_PEDANTIC_WARNINGS
michael@0: #  ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
michael@0: #    define PNG_PEDANTIC_WARNINGS_SUPPORTED
michael@0: #  endif
michael@0: #endif
michael@0: 
michael@0: #ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
michael@0:   /* Support for compiler specific function attributes.  These are used
michael@0:    * so that where compiler support is available, incorrect use of API
michael@0:    * functions in png.h will generate compiler warnings.  Added at libpng
michael@0:    * version 1.2.41.  Disabling these removes the warnings but may also produce
michael@0:    * less efficient code.
michael@0:    */
michael@0: #  if defined(__clang__)
michael@0:      /* Clang defines both __clang__ and __GNUC__. Check __clang__ first. */
michael@0: #    if !defined(PNG_USE_RESULT) && __has_attribute(__warn_unused_result__)
michael@0: #      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
michael@0: #    endif
michael@0: #    if !defined(PNG_NORETURN) && __has_attribute(__noreturn__)
michael@0: #      define PNG_NORETURN __attribute__((__noreturn__))
michael@0: #    endif
michael@0: #    if !defined(PNG_ALLOCATED) && __has_attribute(__malloc__)
michael@0: #      define PNG_ALLOCATED __attribute__((__malloc__))
michael@0: #    endif
michael@0: #    if !defined(PNG_DEPRECATED) && __has_attribute(__deprecated__)
michael@0: #      define PNG_DEPRECATED __attribute__((__deprecated__))
michael@0: #    endif
michael@0: #    if !defined(PNG_PRIVATE)
michael@0: #      ifdef __has_extension
michael@0: #        if __has_extension(attribute_unavailable_with_message)
michael@0: #          define PNG_PRIVATE __attribute__((__unavailable__(\
michael@0:              "This function is not exported by libpng.")))
michael@0: #        endif
michael@0: #      endif
michael@0: #    endif
michael@0: #    ifndef PNG_RESTRICT
michael@0: #      define PNG_RESTRICT __restrict
michael@0: #    endif
michael@0: 
michael@0: #  elif defined(__GNUC__)
michael@0: #    ifndef PNG_USE_RESULT
michael@0: #      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
michael@0: #    endif
michael@0: #    ifndef PNG_NORETURN
michael@0: #      define PNG_NORETURN   __attribute__((__noreturn__))
michael@0: #    endif
michael@0: #    if __GNUC__ >= 3
michael@0: #      ifndef PNG_ALLOCATED
michael@0: #        define PNG_ALLOCATED  __attribute__((__malloc__))
michael@0: #      endif
michael@0: #      ifndef PNG_DEPRECATED
michael@0: #        define PNG_DEPRECATED __attribute__((__deprecated__))
michael@0: #      endif
michael@0: #      ifndef PNG_PRIVATE
michael@0: #        if 0 /* Doesn't work so we use deprecated instead*/
michael@0: #          define PNG_PRIVATE \
michael@0:             __attribute__((warning("This function is not exported by libpng.")))
michael@0: #        else
michael@0: #          define PNG_PRIVATE \
michael@0:             __attribute__((__deprecated__))
michael@0: #        endif
michael@0: #      endif
michael@0: #      if ((__GNUC__ > 3) || !defined(__GNUC_MINOR__) || (__GNUC_MINOR__ >= 1))
michael@0: #        ifndef PNG_RESTRICT
michael@0: #          define PNG_RESTRICT __restrict
michael@0: #        endif
michael@0: #      endif /* __GNUC__.__GNUC_MINOR__ > 3.0 */
michael@0: #    endif /* __GNUC__ >= 3 */
michael@0: 
michael@0: #  elif defined(_MSC_VER)  && (_MSC_VER >= 1300)
michael@0: #    ifndef PNG_USE_RESULT
michael@0: #      define PNG_USE_RESULT /* not supported */
michael@0: #    endif
michael@0: #    ifndef PNG_NORETURN
michael@0: #      define PNG_NORETURN   __declspec(noreturn)
michael@0: #    endif
michael@0: #    ifndef PNG_ALLOCATED
michael@0: #      if (_MSC_VER >= 1400)
michael@0: #        define PNG_ALLOCATED __declspec(restrict)
michael@0: #      endif
michael@0: #    endif
michael@0: #    ifndef PNG_DEPRECATED
michael@0: #      define PNG_DEPRECATED __declspec(deprecated)
michael@0: #    endif
michael@0: #    ifndef PNG_PRIVATE
michael@0: #      define PNG_PRIVATE __declspec(deprecated)
michael@0: #    endif
michael@0: #    ifndef PNG_RESTRICT
michael@0: #      if (_MSC_VER >= 1400)
michael@0: #        define PNG_RESTRICT __restrict
michael@0: #      endif
michael@0: #    endif
michael@0: 
michael@0: #  elif defined(__WATCOMC__)
michael@0: #    ifndef PNG_RESTRICT
michael@0: #      define PNG_RESTRICT __restrict
michael@0: #    endif
michael@0: #  endif
michael@0: #endif /* PNG_PEDANTIC_WARNINGS */
michael@0: 
michael@0: #ifndef PNG_DEPRECATED
michael@0: #  define PNG_DEPRECATED  /* Use of this function is deprecated */
michael@0: #endif
michael@0: #ifndef PNG_USE_RESULT
michael@0: #  define PNG_USE_RESULT  /* The result of this function must be checked */
michael@0: #endif
michael@0: #ifndef PNG_NORETURN
michael@0: #  define PNG_NORETURN    /* This function does not return */
michael@0: #endif
michael@0: #ifndef PNG_ALLOCATED
michael@0: #  define PNG_ALLOCATED   /* The result of the function is new memory */
michael@0: #endif
michael@0: #ifndef PNG_PRIVATE
michael@0: #  define PNG_PRIVATE     /* This is a private libpng function */
michael@0: #endif
michael@0: #ifndef PNG_RESTRICT
michael@0: #  define PNG_RESTRICT    /* The C99 "restrict" feature */
michael@0: #endif
michael@0: 
michael@0: #ifndef PNG_FP_EXPORT     /* A floating point API. */
michael@0: #  ifdef PNG_FLOATING_POINT_SUPPORTED
michael@0: #     define PNG_FP_EXPORT(ordinal, type, name, args)\
michael@0:          PNG_EXPORT(ordinal, type, name, args);
michael@0: #  else                   /* No floating point APIs */
michael@0: #     define PNG_FP_EXPORT(ordinal, type, name, args)
michael@0: #  endif
michael@0: #endif
michael@0: #ifndef PNG_FIXED_EXPORT  /* A fixed point API. */
michael@0: #  ifdef PNG_FIXED_POINT_SUPPORTED
michael@0: #     define PNG_FIXED_EXPORT(ordinal, type, name, args)\
michael@0:          PNG_EXPORT(ordinal, type, name, args);
michael@0: #  else                   /* No fixed point APIs */
michael@0: #     define PNG_FIXED_EXPORT(ordinal, type, name, args)
michael@0: #  endif
michael@0: #endif
michael@0: 
michael@0: #ifndef PNG_BUILDING_SYMBOL_TABLE
michael@0: /* Some typedefs to get us started.  These should be safe on most of the common
michael@0:  * platforms.
michael@0:  *
michael@0:  * png_uint_32 and png_int_32 may, currently, be larger than required to hold a
michael@0:  * 32-bit value however this is not normally advisable.
michael@0:  *
michael@0:  * png_uint_16 and png_int_16 should always be two bytes in size - this is
michael@0:  * verified at library build time.
michael@0:  *
michael@0:  * png_byte must always be one byte in size.
michael@0:  *
michael@0:  * The checks below use constants from limits.h, as defined by the ISOC90
michael@0:  * standard.
michael@0:  */
michael@0: #if CHAR_BIT == 8 && UCHAR_MAX == 255
michael@0:    typedef unsigned char png_byte;
michael@0: #else
michael@0: #  error "libpng requires 8 bit bytes"
michael@0: #endif
michael@0: 
michael@0: #if INT_MIN == -32768 && INT_MAX == 32767
michael@0:    typedef int png_int_16;
michael@0: #elif SHRT_MIN == -32768 && SHRT_MAX == 32767
michael@0:    typedef short png_int_16;
michael@0: #else
michael@0: #  error "libpng requires a signed 16 bit type"
michael@0: #endif
michael@0: 
michael@0: #if UINT_MAX == 65535
michael@0:    typedef unsigned int png_uint_16;
michael@0: #elif USHRT_MAX == 65535
michael@0:    typedef unsigned short png_uint_16;
michael@0: #else
michael@0: #  error "libpng requires an unsigned 16 bit type"
michael@0: #endif
michael@0: 
michael@0: #if INT_MIN < -2147483646 && INT_MAX > 2147483646
michael@0:    typedef int png_int_32;
michael@0: #elif LONG_MIN < -2147483646 && LONG_MAX > 2147483646
michael@0:    typedef long int png_int_32;
michael@0: #else
michael@0: #  error "libpng requires a signed 32 bit (or more) type"
michael@0: #endif
michael@0: 
michael@0: #if UINT_MAX > 4294967294
michael@0:    typedef unsigned int png_uint_32;
michael@0: #elif ULONG_MAX > 4294967294
michael@0:    typedef unsigned long int png_uint_32;
michael@0: #else
michael@0: #  error "libpng requires an unsigned 32 bit (or more) type"
michael@0: #endif
michael@0: 
michael@0: /* Prior to 1.6.0 it was possible to disable the use of size_t, 1.6.0, however,
michael@0:  * requires an ISOC90 compiler and relies on consistent behavior of sizeof.
michael@0:  */
michael@0: typedef size_t png_size_t;
michael@0: typedef ptrdiff_t png_ptrdiff_t;
michael@0: 
michael@0: /* libpng needs to know the maximum value of 'size_t' and this controls the
michael@0:  * definition of png_alloc_size_t, below.  This maximum value of size_t limits
michael@0:  * but does not control the maximum allocations the library makes - there is
michael@0:  * direct application control of this through png_set_user_limits().
michael@0:  */
michael@0: #ifndef PNG_SMALL_SIZE_T
michael@0:    /* Compiler specific tests for systems where size_t is known to be less than
michael@0:     * 32 bits (some of these systems may no longer work because of the lack of
michael@0:     * 'far' support; see above.)
michael@0:     */
michael@0: #  if (defined(__TURBOC__) && !defined(__FLAT__)) ||\
michael@0:    (defined(_MSC_VER) && defined(MAXSEG_64K))
michael@0: #     define PNG_SMALL_SIZE_T
michael@0: #  endif
michael@0: #endif
michael@0: 
michael@0: /* png_alloc_size_t is guaranteed to be no smaller than png_size_t, and no
michael@0:  * smaller than png_uint_32.  Casts from png_size_t or png_uint_32 to
michael@0:  * png_alloc_size_t are not necessary; in fact, it is recommended not to use
michael@0:  * them at all so that the compiler can complain when something turns out to be
michael@0:  * problematic.
michael@0:  *
michael@0:  * Casts in the other direction (from png_alloc_size_t to png_size_t or
michael@0:  * png_uint_32) should be explicitly applied; however, we do not expect to
michael@0:  * encounter practical situations that require such conversions.
michael@0:  *
michael@0:  * PNG_SMALL_SIZE_T must be defined if the maximum value of size_t is less than
michael@0:  * 4294967295 - i.e. less than the maximum value of png_uint_32.
michael@0:  */
michael@0: #ifdef PNG_SMALL_SIZE_T
michael@0:    typedef png_uint_32 png_alloc_size_t;
michael@0: #else
michael@0:    typedef png_size_t png_alloc_size_t;
michael@0: #endif
michael@0: 
michael@0: /* Prior to 1.6.0 libpng offered limited support for Microsoft C compiler
michael@0:  * implementations of Intel CPU specific support of user-mode segmented address
michael@0:  * spaces, where 16-bit pointers address more than 65536 bytes of memory using
michael@0:  * separate 'segment' registers.  The implementation requires two different
michael@0:  * types of pointer (only one of which includes the segment value.)
michael@0:  *
michael@0:  * If required this support is available in version 1.2 of libpng and may be
michael@0:  * available in versions through 1.5, although the correctness of the code has
michael@0:  * not been verified recently.
michael@0:  */
michael@0: 
michael@0: /* Typedef for floating-point numbers that are converted to fixed-point with a
michael@0:  * multiple of 100,000, e.g., gamma
michael@0:  */
michael@0: typedef png_int_32 png_fixed_point;
michael@0: 
michael@0: /* Add typedefs for pointers */
michael@0: typedef void                  * png_voidp;
michael@0: typedef const void            * png_const_voidp;
michael@0: typedef png_byte              * png_bytep;
michael@0: typedef const png_byte        * png_const_bytep;
michael@0: typedef png_uint_32           * png_uint_32p;
michael@0: typedef const png_uint_32     * png_const_uint_32p;
michael@0: typedef png_int_32            * png_int_32p;
michael@0: typedef const png_int_32      * png_const_int_32p;
michael@0: typedef png_uint_16           * png_uint_16p;
michael@0: typedef const png_uint_16     * png_const_uint_16p;
michael@0: typedef png_int_16            * png_int_16p;
michael@0: typedef const png_int_16      * png_const_int_16p;
michael@0: typedef char                  * png_charp;
michael@0: typedef const char            * png_const_charp;
michael@0: typedef png_fixed_point       * png_fixed_point_p;
michael@0: typedef const png_fixed_point * png_const_fixed_point_p;
michael@0: typedef png_size_t            * png_size_tp;
michael@0: typedef const png_size_t      * png_const_size_tp;
michael@0: 
michael@0: #ifdef PNG_STDIO_SUPPORTED
michael@0: typedef FILE            * png_FILE_p;
michael@0: #endif
michael@0: 
michael@0: #ifdef PNG_FLOATING_POINT_SUPPORTED
michael@0: typedef double       * png_doublep;
michael@0: typedef const double * png_const_doublep;
michael@0: #endif
michael@0: 
michael@0: /* Pointers to pointers; i.e. arrays */
michael@0: typedef png_byte        * * png_bytepp;
michael@0: typedef png_uint_32     * * png_uint_32pp;
michael@0: typedef png_int_32      * * png_int_32pp;
michael@0: typedef png_uint_16     * * png_uint_16pp;
michael@0: typedef png_int_16      * * png_int_16pp;
michael@0: typedef const char      * * png_const_charpp;
michael@0: typedef char            * * png_charpp;
michael@0: typedef png_fixed_point * * png_fixed_point_pp;
michael@0: #ifdef PNG_FLOATING_POINT_SUPPORTED
michael@0: typedef double          * * png_doublepp;
michael@0: #endif
michael@0: 
michael@0: /* Pointers to pointers to pointers; i.e., pointer to array */
michael@0: typedef char            * * * png_charppp;
michael@0: 
michael@0: #endif /* PNG_BUILDING_SYMBOL_TABLE */
michael@0: 
michael@0: #endif /* PNGCONF_H */