/*
 * pngconf.h - machine configurable file for libpng
 * *
 * * libpng 1.2.5 - October 3, 2002
 * * For conditions of distribution and use, see copyright notice in png.h
 * * Copyright (c) 1998-2002 Glenn Randers-Pehrson
 * * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 */

/*
 * Any machine specific code is near the front of this file, so if you
 * * are configuring libpng for a machine, you may want to read the section
 * * starting here down to where it starts to typedef png_color, png_text,
 * * and png_info.
 */

#ifndef PNGCONF_H
#  define PNGCONF_H

/*
 * This is the size of the compression buffer, and thus the size of
 * * an IDAT chunk.  Make this whatever size you feel is best for your
 * * machine.  One of these will be allocated per png_struct.  When this
 * * is full, it writes the data to the disk, and does some other
 * * calculations.  Making this an extremely small size will slow
 * * the library down, but you may want to experiment to determine
 * * where it becomes significant, if you are concerned with memory
 * * usage.  Note that zlib allocates at least 32Kb also.  For readers,
 * * this describes the size of the buffer available to read the data in.
 * * Unless this gets smaller than the size of a row (compressed),
 * * it should not make much difference how big this is.
 */

#  ifndef PNG_ZBUF_SIZE
#    define PNG_ZBUF_SIZE 8192
#  endif

/*
 * Enable if you want a write-only libpng 
 */

#  ifndef PNG_NO_READ_SUPPORTED
#    define PNG_READ_SUPPORTED
#  endif

/*
 * Enable if you want a read-only libpng 
 */

#  ifndef PNG_NO_WRITE_SUPPORTED
#    define PNG_WRITE_SUPPORTED
#  endif

/*
 * Enabled by default in 1.2.0.  You can disable this if you don't need to
 * support PNGs that are embedded in MNG datastreams 
 */
#  if !defined(PNG_1_0_X) && !defined(PNG_NO_MNG_FEATURES)
#    ifndef PNG_MNG_FEATURES_SUPPORTED
#      define PNG_MNG_FEATURES_SUPPORTED
#    endif
#  endif

#  ifndef PNG_NO_FLOATING_POINT_SUPPORTED
#    ifndef PNG_FLOATING_POINT_SUPPORTED
#      define PNG_FLOATING_POINT_SUPPORTED
#    endif
#  endif

/*
 * If you are running on a machine where you cannot allocate more
 * * than 64K of memory at once, uncomment this.  While libpng will not
 * * normally need that much memory in a chunk (unless you load up a very
 * * large file), zlib needs to know how big of a chunk it can use, and
 * * libpng thus makes sure to check any memory allocation to verify it
 * * will fit into memory.
 * #define PNG_MAX_MALLOC_64K
 */
#  if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
#    define PNG_MAX_MALLOC_64K
#  endif

/*
 * Special munging to support doing things the 'cygwin' way:
 * * 'Normal' png-on-win32 defines/defaults:
 * *   PNG_BUILD_DLL -- building dll
 * *   PNG_USE_DLL   -- building an application, linking to dll
 * *   (no define)   -- building static library, or building an
 * *                    application and linking to the static lib
 * * 'Cygwin' defines/defaults:
 * *   PNG_BUILD_DLL -- (ignored) building the dll
 * *   (no define)   -- (ignored) building an application, linking to the dll
 * *   PNG_STATIC    -- (ignored) building the static lib, or building an
 * *                    application that links to the static lib.
 * *   ALL_STATIC    -- (ignored) building various static libs, or building an
 * *                    application that links to the static libs.
 * * Thus,
 * * a cygwin user should define either PNG_BUILD_DLL or PNG_STATIC, and
 * * this bit of #ifdefs will define the 'correct' config variables based on
 * * that. If a cygwin user *wants* to define 'PNG_USE_DLL' that's okay, but
 * * unnecessary.
 * *
 * * Also, the precedence order is:
 * *   ALL_STATIC (since we can't #undef something outside our namespace)
 * *   PNG_BUILD_DLL
 * *   PNG_STATIC
 * *   (nothing) == PNG_USE_DLL
 * *
 * * CYGWIN (2002-01-20): The preceding is now obsolete. With the advent
 * *   of auto-import in binutils, we no longer need to worry about
 * *   __declspec(dllexport) / __declspec(dllimport) and friends.  Therefore,
 * *   we don't need to worry about PNG_STATIC or ALL_STATIC when it comes
 * *   to __declspec() stuff.  However, we DO need to worry about
 * *   PNG_BUILD_DLL and PNG_STATIC because those change some defaults
 * *   such as CONSOLE_IO and whether GLOBAL_ARRAYS are allowed.
 */
#  if defined(__CYGWIN__)
#    if defined(ALL_STATIC)
#      if defined(PNG_BUILD_DLL)
#        undef PNG_BUILD_DLL
#      endif
#      if defined(PNG_USE_DLL)
#        undef PNG_USE_DLL
#      endif
#      if defined(PNG_DLL)
#        undef PNG_DLL
#      endif
#      if !defined(PNG_STATIC)
#        define PNG_STATIC
#      endif
#    else
#      if defined (PNG_BUILD_DLL)
#        if defined(PNG_STATIC)
#          undef PNG_STATIC
#        endif
#        if defined(PNG_USE_DLL)
#          undef PNG_USE_DLL
#        endif
#        if !defined(PNG_DLL)
#          define PNG_DLL
#        endif
#      else
#        if defined(PNG_STATIC)
#          if defined(PNG_USE_DLL)
#            undef PNG_USE_DLL
#          endif
#          if defined(PNG_DLL)
#            undef PNG_DLL
#          endif
#        else
#          if !defined(PNG_USE_DLL)
#            define PNG_USE_DLL
#          endif
#          if !defined(PNG_DLL)
#            define PNG_DLL
#          endif
#        endif
#      endif
#    endif
#  endif

/*
 * This protects us against compilers that run on a windowing system
 * * and thus don't have or would rather us not use the stdio types:
 * * stdin, stdout, and stderr.  The only one currently used is stderr
 * * in png_error() and png_warning().  #defining PNG_NO_CONSOLE_IO will
 * * prevent these from being compiled and used. #defining PNG_NO_STDIO
 * * will also prevent these, plus will prevent the entire set of stdio
 * * macros and functions (FILE *, printf, etc.) from being compiled and used,
 * * unless (PNG_DEBUG > 0) has been #defined.
 * *
 * * #define PNG_NO_CONSOLE_IO
 * * #define PNG_NO_STDIO
 */

#  if defined(_WIN32_WCE)
#    include <windows.h>
   /*
    * Console I/O functions are not supported on WindowsCE 
    */
#    define PNG_NO_CONSOLE_IO
#    ifdef PNG_DEBUG
#      undef PNG_DEBUG
#    endif
#  endif

#  ifdef PNG_BUILD_DLL
#    ifndef PNG_CONSOLE_IO_SUPPORTED
#      ifndef PNG_NO_CONSOLE_IO
#        define PNG_NO_CONSOLE_IO
#      endif
#    endif
#  endif

#  ifdef PNG_NO_STDIO
#    ifndef PNG_NO_CONSOLE_IO
#      define PNG_NO_CONSOLE_IO
#    endif
#    ifdef PNG_DEBUG
#      if (PNG_DEBUG > 0)
#        include <stdio.h>
#      endif
#    endif
#  else
#    if !defined(_WIN32_WCE)
/*
 * "stdio.h" functions are not supported on WindowsCE 
 */
#      include <stdio.h>
#    endif
#  endif

/*
 * This macro protects us against machines that don't have function
 * * prototypes (ie K&R style headers).  If your compiler does not handle
 * * function prototypes, define this macro and use the included ansi2knr.
 * * I've always been able to use _NO_PROTO as the indicator, but you may
 * * need to drag the empty declaration out in front of here, or change the
 * * ifdef to suit your own needs.
 */
#  ifndef PNGARG

#    ifdef OF                          /* zlib prototype munger */
#      define PNGARG(arglist) OF(arglist)
#    else

#      ifdef _NO_PROTO
#        define PNGARG(arglist) ()
#        ifndef PNG_TYPECAST_NULL
#          define PNG_TYPECAST_NULL
#        endif
#      else
#        define PNGARG(arglist) arglist
#      endif                           /* _NO_PROTO */

#    endif                             /* OF */

#  endif                               /* PNGARG */

/*
 * Try to determine if we are compiling on a Mac.  Note that testing for
 * * just __MWERKS__ is not good enough, because the Codewarrior is now used
 * * on non-Mac platforms.
 */
#  ifndef MACOS
#    if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
      defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
#      define MACOS
#    endif
#  endif

/*
 * enough people need this for various reasons to include it here 
 */
#  if !defined(MACOS) && !defined(RISCOS) && !defined(_WIN32_WCE)
#    include <sys/types.h>
#  endif

#  if !defined(PNG_SETJMP_NOT_SUPPORTED) && !defined(PNG_NO_SETJMP_SUPPORTED)
#    define PNG_SETJMP_SUPPORTED
#  endif

#  ifdef PNG_SETJMP_SUPPORTED
/*
 * This is an attempt to force a single setjmp behaviour on Linux.  If
 * * the X config stuff didn't define _BSD_SOURCE we wouldn't need this.
 */

#    ifdef _LINUX
#      ifdef _BSD_SOURCE
#        define PNG_SAVE_BSD_SOURCE
#        undef _BSD_SOURCE
#      endif
#      ifdef _SETJMP_H
__png.h__ already includes setjmp.h;
__dont__ include it again.;
#      endif
#    endif                             /* _LINUX */

   /*
    * include setjmp.h for error handling 
    */
#    include <setjmp.h>

#    ifdef _LINUX
#      ifdef PNG_SAVE_BSD_SOURCE
#        define _BSD_SOURCE
#        undef PNG_SAVE_BSD_SOURCE
#      endif
#    endif                             /* _LINUX */
#  endif                               /* PNG_SETJMP_SUPPORTED */

#  ifdef BSD
#    include <strings.h>
#  else
#    include <string.h>
#  endif

/*
 * Other defines for things like memory and the like can go here.  
 */
#  ifdef PNG_INTERNAL

#    include <stdlib.h>

/*
 * The functions exported by PNG_EXTERN are PNG_INTERNAL functions, which
 * * aren't usually used outside the library (as far as I know), so it is
 * * debatable if they should be exported at all.  In the future, when it is
 * * possible to have run-time registry of chunk-handling functions, some of
 * * these will be made available again.
 * #define PNG_EXTERN extern
 */
#    define PNG_EXTERN

/*
 * Other defines specific to compilers can go here.  Try to keep
 * * them inside an appropriate ifdef/endif pair for portability.
 */

#    if defined(PNG_FLOATING_POINT_SUPPORTED)
#      if defined(MACOS)
     /*
      * We need to check that <math.h> hasn't already been included earlier
      * * as it seems it doesn't agree with <fp.h>, yet we should really use
      * * <fp.h> if possible.
      */
#        if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
#          include <fp.h>
#        endif
#      else
#        include <math.h>
#      endif
#      if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
     /*
      * Amiga SAS/C: We must include builtin FPU functions when compiling using
      * * MATH=68881
      */
#        include <m68881.h>
#      endif
#    endif

/*
 * Codewarrior on NT has linking problems without this. 
 */
#    if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__)
#      define PNG_ALWAYS_EXTERN
#    endif

/*
 * For some reason, Borland C++ defines memcmp, etc. in mem.h, not
 * * stdlib.h like it should (I think).  Or perhaps this is a C++
 * * "feature"?
 */
#    ifdef __TURBOC__
#      include <mem.h>
#      include "alloc.h"
#    endif

#    if defined(_MSC_VER) && (defined(WIN32) || defined(_Windows) || \
    defined(_WINDOWS) || defined(_WIN32) || defined(__WIN32__))
#      include <malloc.h>
#    endif

/*
 * This controls how fine the dithering gets.  As this allocates
 * * a largish chunk of memory (32K), those who are not as concerned
 * * with dithering quality can decrease some or all of these.
 */
#    ifndef PNG_DITHER_RED_BITS
#      define PNG_DITHER_RED_BITS 5
#    endif
#    ifndef PNG_DITHER_GREEN_BITS
#      define PNG_DITHER_GREEN_BITS 5
#    endif
#    ifndef PNG_DITHER_BLUE_BITS
#      define PNG_DITHER_BLUE_BITS 5
#    endif

/*
 * This controls how fine the gamma correction becomes when you
 * * are only interested in 8 bits anyway.  Increasing this value
 * * results in more memory being used, and more pow() functions
 * * being called to fill in the gamma tables.  Don't set this value
 * * less then 8, and even that may not work (I haven't tested it).
 */

#    ifndef PNG_MAX_GAMMA_8
#      define PNG_MAX_GAMMA_8 11
#    endif

/*
 * This controls how much a difference in gamma we can tolerate before
 * * we actually start doing gamma conversion.
 */
#    ifndef PNG_GAMMA_THRESHOLD
#      define PNG_GAMMA_THRESHOLD 0.05
#    endif

#  endif                               /* PNG_INTERNAL */

/*
 * The following uses const char * instead of char * for error
 * * and warning message functions, so some compilers won't complain.
 * * If you do not want to use const, define PNG_NO_CONST here.
 */

#  ifndef PNG_NO_CONST
#    define PNG_CONST const
#  else
#    define PNG_CONST
#  endif

/*
 * The following defines give you the ability to remove code from the
 * * library that you will not be using.  I wish I could figure out how to
 * * automate this, but I can't do that without making it seriously hard
 * * on the users.  So if you are not using an ability, change the #define
 * * to and #undef, and that part of the library will not be compiled.  If
 * * your linker can't find a function, you may want to make sure the
 * * ability is defined here.  Some of these depend upon some others being
 * * defined.  I haven't figured out all the interactions here, so you may
 * * have to experiment awhile to get everything to compile.  If you are
 * * creating or using a shared library, you probably shouldn't touch this,
 * * as it will affect the size of the structures, and this will cause bad
 * * things to happen if the library and/or application ever change.
 */

/*
 * Any features you will not be using can be undef'ed here 
 */

/*
 * GR-P, 0.96a: Set "*TRANSFORMS_SUPPORTED as default but allow user
 * * to turn it off with "*TRANSFORMS_NOT_SUPPORTED" or *PNG_NO_*_TRANSFORMS
 * * on the compile line, then pick and choose which ones to define without
 * * having to edit this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED
 * * if you only want to have a png-compliant reader/writer but don't need
 * * any of the extra transformations.  This saves about 80 kbytes in a
 * * typical installation of the library. (PNG_NO_* form added in version
 * * 1.0.1c, for consistency)
 */

/*
 * The size of the png_text structure changed in libpng-1.0.6 when
 * * iTXt is supported.  It is turned off by default, to support old apps
 * * that malloc the png_text structure instead of calling png_set_text()
 * * and letting libpng malloc it.  It will be turned on by default in
 * * libpng-1.3.0.
 */

#  ifndef PNG_iTXt_SUPPORTED
#    if !defined(PNG_READ_iTXt_SUPPORTED) && !defined(PNG_NO_READ_iTXt)
#      define PNG_NO_READ_iTXt
#    endif
#    if !defined(PNG_WRITE_iTXt_SUPPORTED) && !defined(PNG_NO_WRITE_iTXt)
#      define PNG_NO_WRITE_iTXt
#    endif
#  endif

/*
 * The following support, added after version 1.0.0, can be turned off here en
 * * masse by defining PNG_LEGACY_SUPPORTED in case you need binary compatibility
 * * with old applications that require the length of png_struct and png_info
 * * to remain unchanged.
 */

#  ifdef PNG_LEGACY_SUPPORTED
#    define PNG_NO_FREE_ME
#    define PNG_NO_READ_UNKNOWN_CHUNKS
#    define PNG_NO_WRITE_UNKNOWN_CHUNKS
#    define PNG_NO_READ_USER_CHUNKS
#    define PNG_NO_READ_iCCP
#    define PNG_NO_WRITE_iCCP
#    define PNG_NO_READ_iTXt
#    define PNG_NO_WRITE_iTXt
#    define PNG_NO_READ_sCAL
#    define PNG_NO_WRITE_sCAL
#    define PNG_NO_READ_sPLT
#    define PNG_NO_WRITE_sPLT
#    define PNG_NO_INFO_IMAGE
#    define PNG_NO_READ_RGB_TO_GRAY
#    define PNG_NO_READ_USER_TRANSFORM
#    define PNG_NO_WRITE_USER_TRANSFORM
#    define PNG_NO_USER_MEM
#    define PNG_NO_READ_EMPTY_PLTE
#    define PNG_NO_MNG_FEATURES
#    define PNG_NO_FIXED_POINT_SUPPORTED
#  endif

/*
 * Ignore attempt to turn off both floating and fixed point support 
 */
#  if !defined(PNG_FLOATING_POINT_SUPPORTED) || \
    !defined(PNG_NO_FIXED_POINT_SUPPORTED)
#    define PNG_FIXED_POINT_SUPPORTED
#  endif

#  ifndef PNG_NO_FREE_ME
#    define PNG_FREE_ME_SUPPORTED
#  endif

#  if defined(PNG_READ_SUPPORTED)

#    if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \
      !defined(PNG_NO_READ_TRANSFORMS)
#      define PNG_READ_TRANSFORMS_SUPPORTED
#    endif

#    ifdef PNG_READ_TRANSFORMS_SUPPORTED
#      ifndef PNG_NO_READ_EXPAND
#        define PNG_READ_EXPAND_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_SHIFT
#        define PNG_READ_SHIFT_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_PACK
#        define PNG_READ_PACK_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_BGR
#        define PNG_READ_BGR_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_SWAP
#        define PNG_READ_SWAP_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_PACKSWAP
#        define PNG_READ_PACKSWAP_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_INVERT
#        define PNG_READ_INVERT_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_DITHER
#        define PNG_READ_DITHER_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_BACKGROUND
#        define PNG_READ_BACKGROUND_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_16_TO_8
#        define PNG_READ_16_TO_8_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_FILLER
#        define PNG_READ_FILLER_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_GAMMA
#        define PNG_READ_GAMMA_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_GRAY_TO_RGB
#        define PNG_READ_GRAY_TO_RGB_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_SWAP_ALPHA
#        define PNG_READ_SWAP_ALPHA_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_INVERT_ALPHA
#        define PNG_READ_INVERT_ALPHA_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_STRIP_ALPHA
#        define PNG_READ_STRIP_ALPHA_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_USER_TRANSFORM
#        define PNG_READ_USER_TRANSFORM_SUPPORTED
#      endif
#      ifndef PNG_NO_READ_RGB_TO_GRAY
#        define PNG_READ_RGB_TO_GRAY_SUPPORTED
#      endif
#    endif                             /* PNG_READ_TRANSFORMS_SUPPORTED */

#    if !defined(PNG_NO_PROGRESSIVE_READ) && \
 !defined(PNG_PROGRESSIVE_READ_NOT_SUPPORTED)   /* if you don't do progressive */
#      define PNG_PROGRESSIVE_READ_SUPPORTED    /* reading.  This is not talking */
#    endif                             /* about interlacing capability!  You'll */
              /*
               * still have interlacing unless you change the following line: 
               */

#    define PNG_READ_INTERLACING_SUPPORTED
                                       /* required for PNG-compliant decoders */

#    ifndef PNG_NO_READ_COMPOSITE_NODIV
#      ifndef PNG_NO_READ_COMPOSITED_NODIV
                                       /* libpng-1.0.x misspelling */
#        define PNG_READ_COMPOSITE_NODIV_SUPPORTED
                                                /* well tested on Intel, SGI */
#      endif
#    endif

/*
 * Deprecated, will be removed from version 2.0.0.
 * Use PNG_MNG_FEATURES_SUPPORTED instead. 
 */
#    ifndef PNG_NO_READ_EMPTY_PLTE
#      define PNG_READ_EMPTY_PLTE_SUPPORTED
#    endif

#  endif                               /* PNG_READ_SUPPORTED */

#  if defined(PNG_WRITE_SUPPORTED)

#    if !defined(PNG_WRITE_TRANSFORMS_NOT_SUPPORTED) && \
    !defined(PNG_NO_WRITE_TRANSFORMS)
#      define PNG_WRITE_TRANSFORMS_SUPPORTED
#    endif

#    ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
#      ifndef PNG_NO_WRITE_SHIFT
#        define PNG_WRITE_SHIFT_SUPPORTED
#      endif
#      ifndef PNG_NO_WRITE_PACK
#        define PNG_WRITE_PACK_SUPPORTED
#      endif
#      ifndef PNG_NO_WRITE_BGR
#        define PNG_WRITE_BGR_SUPPORTED
#      endif
#      ifndef PNG_NO_WRITE_SWAP
#        define PNG_WRITE_SWAP_SUPPORTED
#      endif
#      ifndef PNG_NO_WRITE_PACKSWAP
#        define PNG_WRITE_PACKSWAP_SUPPORTED
#      endif
#      ifndef PNG_NO_WRITE_INVERT
#        define PNG_WRITE_INVERT_SUPPORTED
#      endif
#      ifndef PNG_NO_WRITE_FILLER
#        define PNG_WRITE_FILLER_SUPPORTED
                                       /* same as WRITE_STRIP_ALPHA */
#      endif
#      ifndef PNG_NO_WRITE_SWAP_ALPHA
#        define PNG_WRITE_SWAP_ALPHA_SUPPORTED
#      endif
#      ifndef PNG_NO_WRITE_INVERT_ALPHA
#        define PNG_WRITE_INVERT_ALPHA_SUPPORTED
#      endif
#      ifndef PNG_NO_WRITE_USER_TRANSFORM
#        define PNG_WRITE_USER_TRANSFORM_SUPPORTED
#      endif
#    endif                             /* PNG_WRITE_TRANSFORMS_SUPPORTED */

#    if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
#      ifndef PNG_NO_USER_TRANSFORM_PTR
#        define PNG_USER_TRANSFORM_PTR_SUPPORTED
#      endif
#    endif

#    define PNG_WRITE_INTERLACING_SUPPORTED
                                        /* not required for PNG-compliant
                                         * encoders, but can cause trouble
                                         * if left undefined */

#    if !defined(PNG_NO_WRITE_WEIGHTED_FILTER) && \
     defined(PNG_FLOATING_POINT_SUPPORTED)
#      define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
#    endif

#    ifndef PNG_1_0_X
#      ifndef PNG_NO_ERROR_NUMBERS
#        define PNG_ERROR_NUMBERS_SUPPORTED
#      endif
#    endif                             /* PNG_1_0_X */

#    ifndef PNG_NO_WRITE_FLUSH
#      define PNG_WRITE_FLUSH_SUPPORTED
#    endif

/*
 * Deprecated, see PNG_MNG_FEATURES_SUPPORTED, above 
 */
#    ifndef PNG_NO_WRITE_EMPTY_PLTE
#      define PNG_WRITE_EMPTY_PLTE_SUPPORTED
#    endif

#  endif                               /* PNG_WRITE_SUPPORTED */

#  ifndef PNG_NO_STDIO
#    define PNG_TIME_RFC1123_SUPPORTED
#  endif

/*
 * This adds extra functions in pngget.c for accessing data from the
 * * info pointer (added in version 0.99)
 * * png_get_image_width()
 * * png_get_image_height()
 * * png_get_bit_depth()
 * * png_get_color_type()
 * * png_get_compression_type()
 * * png_get_filter_type()
 * * png_get_interlace_type()
 * * png_get_pixel_aspect_ratio()
 * * png_get_pixels_per_meter()
 * * png_get_x_offset_pixels()
 * * png_get_y_offset_pixels()
 * * png_get_x_offset_microns()
 * * png_get_y_offset_microns()
 */
#  if !defined(PNG_NO_EASY_ACCESS) && !defined(PNG_EASY_ACCESS_SUPPORTED)
#    define PNG_EASY_ACCESS_SUPPORTED
#  endif

/*
 * PNG_ASSEMBLER_CODE was enabled by default in version 1.2.0
 * even when PNG_USE_PNGVCRD or PNG_USE_PNGGCCRD is not defined 
 */
#  if defined(PNG_READ_SUPPORTED) && !defined(PNG_NO_ASSEMBLER_CODE)
#    ifndef PNG_ASSEMBLER_CODE_SUPPORTED
#      define PNG_ASSEMBLER_CODE_SUPPORTED
#    endif
#    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
#      define PNG_MMX_CODE_SUPPORTED
#    endif
#  endif

/*
 * If you are sure that you don't need thread safety and you are compiling
 * with PNG_USE_PNGCCRD for an MMX application, you can define this for
 * faster execution.  See pnggccrd.c.
 * #define PNG_THREAD_UNSAFE_OK
 */

#  if !defined(PNG_1_0_X)
#    if !defined(PNG_NO_USER_MEM) && !defined(PNG_USER_MEM_SUPPORTED)
#      define PNG_USER_MEM_SUPPORTED
#    endif
#  endif                               /* PNG_1_0_X */

/*
 * These are currently experimental features, define them if you want 
 */

/*
 * very little testing 
 */
/*
 * #ifdef PNG_READ_SUPPORTED
 * #  ifndef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
 * #    define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
 * #  endif
 * #endif
 */

/*
 * This is only for PowerPC big-endian and 680x0 systems 
 */
/*
 * some testing 
 */
/*
 * #ifdef PNG_READ_SUPPORTED
 * #  ifndef PNG_PNG_READ_BIG_ENDIAN_SUPPORTED
 * #    define PNG_READ_BIG_ENDIAN_SUPPORTED
 * #  endif
 * #endif
 */

/*
 * Buggy compilers (e.g., gcc 2.7.2.2) need this 
 */
/*
 * #define PNG_NO_POINTER_INDEXING
 */

/*
 * These functions are turned off by default, as they will be phased out. 
 */
/*
 * #define  PNG_USELESS_TESTS_SUPPORTED
 * #define  PNG_CORRECT_PALETTE_SUPPORTED
 */

/*
 * Any chunks you are not interested in, you can undef here.  The
 * * ones that allocate memory may be expecially important (hIST,
 * * tEXt, zTXt, tRNS, pCAL).  Others will just save time and make png_info
 * * a bit smaller.
 */

#  if defined(PNG_READ_SUPPORTED) && \
    !defined(PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
    !defined(PNG_NO_READ_ANCILLARY_CHUNKS)
#    define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
#  endif

#  if defined(PNG_WRITE_SUPPORTED) && \
    !defined(PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
    !defined(PNG_NO_WRITE_ANCILLARY_CHUNKS)
#    define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
#  endif

#  ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED

#    ifdef PNG_NO_READ_TEXT
#      define PNG_NO_READ_iTXt
#      define PNG_NO_READ_tEXt
#      define PNG_NO_READ_zTXt
#    endif
#    ifndef PNG_NO_READ_bKGD
#      define PNG_READ_bKGD_SUPPORTED
#      define PNG_bKGD_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_cHRM
#      define PNG_READ_cHRM_SUPPORTED
#      define PNG_cHRM_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_gAMA
#      define PNG_READ_gAMA_SUPPORTED
#      define PNG_gAMA_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_hIST
#      define PNG_READ_hIST_SUPPORTED
#      define PNG_hIST_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_iCCP
#      define PNG_READ_iCCP_SUPPORTED
#      define PNG_iCCP_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_iTXt
#      ifndef PNG_READ_iTXt_SUPPORTED
#        define PNG_READ_iTXt_SUPPORTED
#      endif
#      ifndef PNG_iTXt_SUPPORTED
#        define PNG_iTXt_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_READ_oFFs
#      define PNG_READ_oFFs_SUPPORTED
#      define PNG_oFFs_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_pCAL
#      define PNG_READ_pCAL_SUPPORTED
#      define PNG_pCAL_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_sCAL
#      define PNG_READ_sCAL_SUPPORTED
#      define PNG_sCAL_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_pHYs
#      define PNG_READ_pHYs_SUPPORTED
#      define PNG_pHYs_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_sBIT
#      define PNG_READ_sBIT_SUPPORTED
#      define PNG_sBIT_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_sPLT
#      define PNG_READ_sPLT_SUPPORTED
#      define PNG_sPLT_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_sRGB
#      define PNG_READ_sRGB_SUPPORTED
#      define PNG_sRGB_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_tEXt
#      define PNG_READ_tEXt_SUPPORTED
#      define PNG_tEXt_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_tIME
#      define PNG_READ_tIME_SUPPORTED
#      define PNG_tIME_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_tRNS
#      define PNG_READ_tRNS_SUPPORTED
#      define PNG_tRNS_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_zTXt
#      define PNG_READ_zTXt_SUPPORTED
#      define PNG_zTXt_SUPPORTED
#    endif
#    ifndef PNG_NO_READ_UNKNOWN_CHUNKS
#      define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
#      ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
#        define PNG_UNKNOWN_CHUNKS_SUPPORTED
#      endif
#      ifndef PNG_NO_HANDLE_AS_UNKNOWN
#        define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
#      endif
#    endif
#    if !defined(PNG_NO_READ_USER_CHUNKS) && \
     defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
#      define PNG_READ_USER_CHUNKS_SUPPORTED
#      define PNG_USER_CHUNKS_SUPPORTED
#      ifdef PNG_NO_READ_UNKNOWN_CHUNKS
#        undef PNG_NO_READ_UNKNOWN_CHUNKS
#      endif
#      ifdef PNG_NO_HANDLE_AS_UNKNOWN
#        undef PNG_NO_HANDLE_AS_UNKNOWN
#      endif
#    endif
#    ifndef PNG_NO_READ_OPT_PLTE
#      define PNG_READ_OPT_PLTE_SUPPORTED
                                       /* only affects support of the */
#    endif                             /* optional PLTE chunk in RGB and RGBA images */
#    if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
    defined(PNG_READ_zTXt_SUPPORTED)
#      define PNG_READ_TEXT_SUPPORTED
#      define PNG_TEXT_SUPPORTED
#    endif

#  endif                               /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */

#  ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED

#    ifdef PNG_NO_WRITE_TEXT
#      define PNG_NO_WRITE_iTXt
#      define PNG_NO_WRITE_tEXt
#      define PNG_NO_WRITE_zTXt
#    endif
#    ifndef PNG_NO_WRITE_bKGD
#      define PNG_WRITE_bKGD_SUPPORTED
#      ifndef PNG_bKGD_SUPPORTED
#        define PNG_bKGD_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_cHRM
#      define PNG_WRITE_cHRM_SUPPORTED
#      ifndef PNG_cHRM_SUPPORTED
#        define PNG_cHRM_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_gAMA
#      define PNG_WRITE_gAMA_SUPPORTED
#      ifndef PNG_gAMA_SUPPORTED
#        define PNG_gAMA_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_hIST
#      define PNG_WRITE_hIST_SUPPORTED
#      ifndef PNG_hIST_SUPPORTED
#        define PNG_hIST_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_iCCP
#      define PNG_WRITE_iCCP_SUPPORTED
#      ifndef PNG_iCCP_SUPPORTED
#        define PNG_iCCP_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_iTXt
#      ifndef PNG_WRITE_iTXt_SUPPORTED
#        define PNG_WRITE_iTXt_SUPPORTED
#      endif
#      ifndef PNG_iTXt_SUPPORTED
#        define PNG_iTXt_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_oFFs
#      define PNG_WRITE_oFFs_SUPPORTED
#      ifndef PNG_oFFs_SUPPORTED
#        define PNG_oFFs_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_pCAL
#      define PNG_WRITE_pCAL_SUPPORTED
#      ifndef PNG_pCAL_SUPPORTED
#        define PNG_pCAL_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_sCAL
#      define PNG_WRITE_sCAL_SUPPORTED
#      ifndef PNG_sCAL_SUPPORTED
#        define PNG_sCAL_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_pHYs
#      define PNG_WRITE_pHYs_SUPPORTED
#      ifndef PNG_pHYs_SUPPORTED
#        define PNG_pHYs_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_sBIT
#      define PNG_WRITE_sBIT_SUPPORTED
#      ifndef PNG_sBIT_SUPPORTED
#        define PNG_sBIT_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_sPLT
#      define PNG_WRITE_sPLT_SUPPORTED
#      ifndef PNG_sPLT_SUPPORTED
#        define PNG_sPLT_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_sRGB
#      define PNG_WRITE_sRGB_SUPPORTED
#      ifndef PNG_sRGB_SUPPORTED
#        define PNG_sRGB_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_tEXt
#      define PNG_WRITE_tEXt_SUPPORTED
#      ifndef PNG_tEXt_SUPPORTED
#        define PNG_tEXt_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_tIME
#      define PNG_WRITE_tIME_SUPPORTED
#      ifndef PNG_tIME_SUPPORTED
#        define PNG_tIME_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_tRNS
#      define PNG_WRITE_tRNS_SUPPORTED
#      ifndef PNG_tRNS_SUPPORTED
#        define PNG_tRNS_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_zTXt
#      define PNG_WRITE_zTXt_SUPPORTED
#      ifndef PNG_zTXt_SUPPORTED
#        define PNG_zTXt_SUPPORTED
#      endif
#    endif
#    ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
#      define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
#      ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
#        define PNG_UNKNOWN_CHUNKS_SUPPORTED
#      endif
#      ifndef PNG_NO_HANDLE_AS_UNKNOWN
#        ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
#          define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
#        endif
#      endif
#    endif
#    if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
    defined(PNG_WRITE_zTXt_SUPPORTED)
#      define PNG_WRITE_TEXT_SUPPORTED
#      ifndef PNG_TEXT_SUPPORTED
#        define PNG_TEXT_SUPPORTED
#      endif
#    endif

#  endif                               /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */

/*
 * Turn this off to disable png_read_png() and
 * * png_write_png() and leave the row_pointers member
 * * out of the info structure.
 */
#  ifndef PNG_NO_INFO_IMAGE
#    define PNG_INFO_IMAGE_SUPPORTED
#  endif

/*
 * need the time information for reading tIME chunks 
 */
#  if defined(PNG_tIME_SUPPORTED)
#    if !defined(_WIN32_WCE)
     /*
      * "time.h" functions are not supported on WindowsCE 
      */
#      include <time.h>
#    endif
#  endif

/*
 * Some typedefs to get us started.  These should be safe on most of the
 * * common platforms.  The typedefs should be at least as large as the
 * * numbers suggest (a png_uint_32 must be at least 32 bits long), but they
 * * don't have to be exactly that size.  Some compilers dislike passing
 * * unsigned shorts as function parameters, so you may be better off using
 * * unsigned int for png_uint_16.  Likewise, for 64-bit systems, you may
 * * want to have unsigned int for png_uint_32 instead of unsigned long.
 */

typedef unsigned long png_uint_32;
typedef long  png_int_32;
typedef unsigned short png_uint_16;
typedef short png_int_16;
typedef unsigned char png_byte;

/*
 * This is usually size_t.  It is typedef'ed just in case you need it to
 * change (I'm not sure if you will or not, so I thought I'd be safe) 
 */
typedef size_t png_size_t;

/*
 * The following is needed for medium model support.  It cannot be in the
 * * PNG_INTERNAL section.  Needs modification for other compilers besides
 * * MSC.  Model independent support declares all arrays and pointers to be
 * * large using the far keyword.  The zlib version used must also support
 * * model independent data.  As of version zlib 1.0.4, the necessary changes
 * * have been made in zlib.  The USE_FAR_KEYWORD define triggers other
 * * changes that are needed. (Tim Wegner)
 */

/*
 * Separate compiler dependencies (problem here is that zlib.h always
 * defines FAR. (SJT) 
 */
#  ifdef __BORLANDC__
#    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
#      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 
 */
#  if defined(FAR)
#    if defined(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., int_gamma 
 */
typedef png_int_32 png_fixed_point;

/*
 * Add typedefs for pointers 
 */
typedef void FAR *png_voidp;
typedef png_byte FAR *png_bytep;
typedef png_uint_32 FAR *png_uint_32p;
typedef png_int_32 FAR *png_int_32p;
typedef png_uint_16 FAR *png_uint_16p;
typedef png_int_16 FAR *png_int_16p;
typedef PNG_CONST char FAR *png_const_charp;
typedef char FAR *png_charp;
typedef png_fixed_point FAR *png_fixed_point_p;

#  ifndef PNG_NO_STDIO
#    if defined(_WIN32_WCE)
typedef HANDLE png_FILE_p;
#    else
typedef FILE *png_FILE_p;
#    endif
#  endif

#  ifdef PNG_FLOATING_POINT_SUPPORTED
typedef double FAR *png_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;

/*
 * libpng typedefs for types in zlib. If zlib changes
 * * or another compression library is used, then change these.
 * * Eliminates need to change all the source files.
 */
typedef charf *png_zcharp;
typedef charf *FAR * png_zcharpp;
typedef z_stream FAR *png_zstreamp;

/*
 * Define PNG_BUILD_DLL if the module being built is a Windows
 * LIBPNG DLL.
 *
 * Define PNG_USE_DLL if you want to *link* to the Windows LIBPNG DLL.
 * It is equivalent to Microsoft predefined macro _DLL that is
 * automatically defined when you compile using the share
 * version of the CRT (C Run-Time library)
 *
 * The cygwin mods make this behavior a little different:
 * Define PNG_BUILD_DLL if you are building a dll for use with cygwin
 * Define PNG_STATIC if you are building a static library for use with cygwin,
 *   -or- if you are building an application that you want to link to the
 *   static library.
 * PNG_USE_DLL is defined by default (no user action needed) unless one of
 *   the other flags is defined.
 */

#  if !defined(PNG_DLL) && (defined(PNG_BUILD_DLL) || defined(PNG_USE_DLL))
#    define PNG_DLL
#  endif
/*
 * If CYGWIN, then disallow GLOBAL ARRAYS unless building a static lib.
 * * When building a static lib, default to no GLOBAL ARRAYS, but allow
 * * command-line override
 */
#  if defined(__CYGWIN__)
#    if !defined(PNG_STATIC)
#      if defined(PNG_USE_GLOBAL_ARRAYS)
#        undef PNG_USE_GLOBAL_ARRAYS
#      endif
#      if !defined(PNG_USE_LOCAL_ARRAYS)
#        define PNG_USE_LOCAL_ARRAYS
#      endif
#    else
#      if defined(PNG_USE_LOCAL_ARRAYS) || defined(PNG_NO_GLOBAL_ARRAYS)
#        if defined(PNG_USE_GLOBAL_ARRAYS)
#          undef PNG_USE_GLOBAL_ARRAYS
#        endif
#      endif
#    endif
#    if !defined(PNG_USE_LOCAL_ARRAYS) && !defined(PNG_USE_GLOBAL_ARRAYS)
#      define PNG_USE_LOCAL_ARRAYS
#    endif
#  endif

/*
 * Do not use global arrays (helps with building DLL's)
 * * They are no longer used in libpng itself, since version 1.0.5c,
 * * but might be required for some pre-1.0.5c applications.
 */
#  if !defined(PNG_USE_LOCAL_ARRAYS) && !defined(PNG_USE_GLOBAL_ARRAYS)
#    if defined(PNG_NO_GLOBAL_ARRAYS) || (defined(__GNUC__) && defined(PNG_DLL))
#      define PNG_USE_LOCAL_ARRAYS
#    else
#      define PNG_USE_GLOBAL_ARRAYS
#    endif
#  endif

#  if defined(__CYGWIN__)
#    undef PNGAPI
#    define PNGAPI __cdecl
#    undef PNG_IMPEXP
#    define PNG_IMPEXP
#  endif

/*
 * If you define PNGAPI, e.g., with compiler option "-DPNGAPI=__stdcall",
 * * you may get warnings regarding the linkage of png_zalloc and png_zfree.
 * * Don't ignore those warnings; you must also reset the default calling
 * * convention in your compiler to match your PNGAPI, and you must build
 * * zlib and your applications the same way you build libpng.
 */

#  ifndef PNGAPI

#    if defined(__MINGW32__) && !defined(PNG_MODULEDEF)
#      ifndef PNG_NO_MODULEDEF
#        define PNG_NO_MODULEDEF
#      endif
#    endif

#    if !defined(PNG_IMPEXP) && defined(PNG_BUILD_DLL) && !defined(PNG_NO_MODULEDEF)
#      define PNG_IMPEXP
#    endif

#    if defined(PNG_DLL) || defined(_DLL) || defined(__DLL__ ) || \
    (( defined(_Windows) || defined(_WINDOWS) || \
       defined(WIN32) || defined(_WIN32) || defined(__WIN32__) ))

#      if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
#        define PNGAPI __cdecl
#      else
#        define PNGAPI _cdecl
#      endif

#      if !defined(PNG_IMPEXP) && (!defined(PNG_DLL) || \
       0 /* WINCOMPILER_WITH_NO_SUPPORT_FOR_DECLIMPEXP */)
#        define PNG_IMPEXP
#      endif

#      if !defined(PNG_IMPEXP)

#        define PNG_EXPORT_TYPE1(type,symbol)  PNG_IMPEXP type PNGAPI symbol
#        define PNG_EXPORT_TYPE2(type,symbol)  type PNG_IMPEXP PNGAPI symbol

      /*
       * Borland/Microsoft 
       */
#        if defined(_MSC_VER) || defined(__BORLANDC__)
#          if (_MSC_VER >= 800) || (__BORLANDC__ >= 0x500)
#            define PNG_EXPORT PNG_EXPORT_TYPE1
#          else
#            define PNG_EXPORT PNG_EXPORT_TYPE2
#            if defined(PNG_BUILD_DLL)
#              define PNG_IMPEXP __export
#            else
#              define PNG_IMPEXP /*__import */  /* doesn't exist AFAIK in
                                                 * VC++ */
#            endif                     /* Exists in Borland C++ for
                                        * C++ classes (== huge) */
#          endif
#        endif

#        if !defined(PNG_IMPEXP)
#          if defined(PNG_BUILD_DLL)
#            define PNG_IMPEXP __declspec(dllexport)
#          else
#            define PNG_IMPEXP __declspec(dllimport)
#          endif
#        endif
#      endif                           /* PNG_IMPEXP */
#    else                              /* !(DLL || non-cygwin WINDOWS) */
#      if (defined(__IBMC__) || defined(IBMCPP__)) && defined(__OS2__)
#        define PNGAPI _System
#        define PNG_IMPEXP
#      else
#        if 0                          /* ... other platforms, with other meanings */
#        else
#          define PNGAPI
#          define PNG_IMPEXP
#        endif
#      endif
#    endif
#  endif

#  ifndef PNGAPI
#    define PNGAPI
#  endif
#  ifndef PNG_IMPEXP
#    define PNG_IMPEXP
#  endif

#  ifndef PNG_EXPORT
#    define PNG_EXPORT(type,symbol) PNG_IMPEXP type PNGAPI symbol
#  endif

#  ifdef PNG_USE_GLOBAL_ARRAYS
#    ifndef PNG_EXPORT_VAR
#      define PNG_EXPORT_VAR(type) extern PNG_IMPEXP type
#    endif
#  endif

/*
 * User may want to use these so they are not in PNG_INTERNAL. Any library
 * * functions that are passed far data must be model independent.
 */

#  ifndef PNG_ABORT
#    define PNG_ABORT() abort()
#  endif

#  ifdef PNG_SETJMP_SUPPORTED
#    define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
#  else
#    define png_jmpbuf(png_ptr) \
   (LIBPNG_WAS_COMPILED_WITH__PNG_SETJMP_NOT_SUPPORTED)
#  endif

#  if defined(USE_FAR_KEYWORD)         /* memory model independent fns */
/*
 * use this to make far-to-near assignments 
 */
#    define CHECK   1
#    define NOCHECK 0
#    define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
#    define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
#    define png_strcpy _fstrcpy
#    define png_strlen _fstrlen
#    define png_memcmp _fmemcmp        /* SJT: added */
#    define png_memcpy _fmemcpy
#    define png_memset _fmemset
#  else                                /* use the usual functions */
#    define CVT_PTR(ptr)         (ptr)
#    define CVT_PTR_NOCHECK(ptr) (ptr)
#    define png_strcpy strcpy
#    define png_strlen strlen
#    define png_memcmp memcmp          /* SJT: added */
#    define png_memcpy memcpy
#    define png_memset memset
#  endif
/*
 * End of memory model independent support 
 */

/*
 * Just a little check that someone hasn't tried to define something
 * * contradictory.
 */
#  if (PNG_ZBUF_SIZE > 65536) && defined(PNG_MAX_MALLOC_64K)
#    undef PNG_ZBUF_SIZE
#    define PNG_ZBUF_SIZE 65536
#  endif

#  ifdef PNG_READ_SUPPORTED
/*
 * Prior to libpng-1.0.9, this block was in pngasmrd.h 
 */
#    if defined(PNG_INTERNAL)

/*
 * These are the default thresholds before the MMX code kicks in; if either
 * * rowbytes or bitdepth is below the threshold, plain C code is used.  These
 * * can be overridden at runtime via the png_set_mmx_thresholds() call in
 * * libpng 1.2.0 and later.  The values below were chosen by Intel.
 */

#      ifndef PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT
#        define PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT  128 /*  >=  */
#      endif
#      ifndef PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT
#        define PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT  9
                                                /*  >=  */
#      endif

/*
 * Set this in the makefile for VC++ on Pentium, not here. 
 */
/*
 * Platform must be Pentium.  Makefile must assemble and load pngvcrd.c .
 * * MMX will be detected at run time and used if present.
 */
#      ifdef PNG_USE_PNGVCRD
#        define PNG_HAVE_ASSEMBLER_COMBINE_ROW
#        define PNG_HAVE_ASSEMBLER_READ_INTERLACE
#        define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
#      endif

/*
 * Set this in the makefile for gcc/as on Pentium, not here. 
 */
/*
 * Platform must be Pentium.  Makefile must assemble and load pnggccrd.c .
 * * MMX will be detected at run time and used if present.
 */
#      ifdef PNG_USE_PNGGCCRD
#        define PNG_HAVE_ASSEMBLER_COMBINE_ROW
#        define PNG_HAVE_ASSEMBLER_READ_INTERLACE
#        define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
#      endif
/*
 * - see pnggccrd.c for info about what is currently enabled 
 */

#    endif                             /* PNG_INTERNAL */
#  endif                               /* PNG_READ_SUPPORTED */

#endif                                 /* PNGCONF_H */
