text: 
  /* pngconf.h - machine configurable file for libpng
   *
   * libpng version 1.2.29 - May 8, 2008
   * For conditions of distribution and use, see copyright notice in png.h
   * Copyright (c) 1998-2008 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
  
  #define PNG_1_2_X
  
  /* 
   * PNG_USER_CONFIG has to be defined on the compiler command line. This
   * includes the resource compiler for Windows DLL configurations.
   */
  #ifdef PNG_USER_CONFIG
  #  ifndef PNG_USER_PRIVATEBUILD
  #    define PNG_USER_PRIVATEBUILD
  #  endif
  #include "pngusr.h"
  #endif
  
  /* PNG_CONFIGURE_LIBPNG is set by the "configure" script. */
  #ifdef PNG_CONFIGURE_LIBPNG
  #ifdef HAVE_CONFIG_H
  #include "config.h"
  #endif
  #endif
  
  /*
   * Added at libpng-1.2.8
   *  
   * If you create a private DLL you need to define in "pngusr.h" the followings:
   * #define PNG_USER_PRIVATEBUILD <Describes by whom and why this version of
   *        the DLL was built>
   *  e.g. #define PNG_USER_PRIVATEBUILD "Build by MyCompany for xyz reasons."
   * #define PNG_USER_DLLFNAME_POSTFIX <two-letter postfix that serve to
   *        distinguish your DLL from those of the official release. These
   *        correspond to the trailing letters that come after the version
   *        number and must match your private DLL name>
   *  e.g. // private DLL "libpng13gx.dll"
   *       #define PNG_USER_DLLFNAME_POSTFIX "gx"
   * 
   * The following macros are also at your disposal if you want to complete the 
   * DLL VERSIONINFO structure.
   * - PNG_USER_VERSIONINFO_COMMENTS
   * - PNG_USER_VERSIONINFO_COMPANYNAME
   * - PNG_USER_VERSIONINFO_LEGALTRADEMARKS
   */
  
  #ifdef __STDC__
  #ifdef SPECIALBUILD
  #  pragma message("PNG_LIBPNG_SPECIALBUILD (and deprecated SPECIALBUILD)\
   are now LIBPNG reserved macros. Use PNG_USER_PRIVATEBUILD instead.")
  #endif
  
  #ifdef PRIVATEBUILD
  # pragma message("PRIVATEBUILD is deprecated.\
   Use PNG_USER_PRIVATEBUILD instead.")
  # define PNG_USER_PRIVATEBUILD PRIVATEBUILD
  #endif
  #endif /* __STDC__ */
  
  #ifndef PNG_VERSION_INFO_ONLY
  
  /* End of material added to libpng-1.2.8 */
  
  /* Added at libpng-1.2.19, removed at libpng-1.2.20 because it caused trouble
     Restored at libpng-1.2.21 */
  #if !defined(PNG_NO_WARN_UNINITIALIZED_ROW) && \
      !defined(PNG_WARN_UNINITIALIZED_ROW)
  #  define PNG_WARN_UNINITIALIZED_ROW 1
  #endif
  /* End of material added at libpng-1.2.19/1.2.21 */
  
  /* 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
       /* If you encounter a compiler error here, see the explanation
        * near the end of INSTALL.
        */
           __pngconf.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
  #      ifndef _BSD_SOURCE
  #        define _BSD_SOURCE
  #      endif
  #      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
  
  /* This provides the non-ANSI (far) memory allocation routines. */
  #if defined(__TURBOC__) && defined(__MSDOS__)
  #  include <mem.h>
  #  include <alloc.h>
  #endif
  
  /* I have no idea why is this necessary... */
  #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 support was added.  iTXt support was turned off by default through
   * libpng-1.2.x, to support old apps that malloc the png_text structure
   * instead of calling png_set_text() and letting libpng malloc it.  It
   * was turned on by default in libpng-1.3.0.
   */
  
  #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
  #  ifndef PNG_NO_iTXt_SUPPORTED
  #    define PNG_NO_iTXt_SUPPORTED
  #  endif
  #  ifndef PNG_NO_READ_iTXt
  #    define PNG_NO_READ_iTXt
  #  endif
  #  ifndef PNG_NO_WRITE_iTXt
  #    define PNG_NO_WRITE_iTXt
  #  endif
  #endif
  
  #if !defined(PNG_NO_iTXt_SUPPORTED)
  #  if !defined(PNG_READ_iTXt_SUPPORTED) && !defined(PNG_NO_READ_iTXt)
  #    define PNG_READ_iTXt
  #  endif
  #  if !defined(PNG_WRITE_iTXt_SUPPORTED) && !defined(PNG_NO_WRITE_iTXt)
  #    define PNG_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_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 in 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
  
  #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
  /* 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
  
  #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_NO_WRITE_INTERLACING_SUPPORTED) && \
      !defined(PNG_WRITE_INTERLACING_SUPPORTED)
  #define PNG_WRITE_INTERLACING_SUPPORTED  /* not required for PNG-compliant
                                              encoders, but can cause trouble
                                              if left undefined */
  #endif
  
  #if !defined(PNG_NO_WRITE_WEIGHTED_FILTER) && \
      !defined(PNG_WRITE_WEIGHTED_FILTER) && \
       defined(PNG_FLOATING_POINT_SUPPORTED)
  #  define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
  #endif
  
  #ifndef PNG_NO_WRITE_FLUSH
  #  define PNG_WRITE_FLUSH_SUPPORTED
  #endif
  
  #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
  /* Deprecated, see PNG_MNG_FEATURES_SUPPORTED, above */
  #ifndef PNG_NO_WRITE_EMPTY_PLTE
  #  define PNG_WRITE_EMPTY_PLTE_SUPPORTED
  #endif
  #endif
  
  #endif /* PNG_WRITE_SUPPORTED */
  
  #ifndef PNG_1_0_X
  #  ifndef PNG_NO_ERROR_NUMBERS
  #    define PNG_ERROR_NUMBERS_SUPPORTED
  #  endif
  #endif /* PNG_1_0_X */
  
  #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
  
  #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 
   * and removed from version 1.2.20.  The following will be removed
   * from libpng-1.4.0
  */
  
  #if defined(PNG_READ_SUPPORTED) && !defined(PNG_NO_OPTIMIZED_CODE)
  #  ifndef PNG_OPTIMIZED_CODE_SUPPORTED
  #    define PNG_OPTIMIZED_CODE_SUPPORTED
  #  endif
  #endif
  
  #if defined(PNG_READ_SUPPORTED) && !defined(PNG_NO_ASSEMBLER_CODE)
  #  ifndef PNG_ASSEMBLER_CODE_SUPPORTED
  #    define PNG_ASSEMBLER_CODE_SUPPORTED
  #  endif
  
  #  if defined(__GNUC__) && defined(__x86_64__) && (__GNUC__ < 4)
       /* work around 64-bit gcc compiler bugs in gcc-3.x */
  #    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
  #      define PNG_NO_MMX_CODE
  #    endif
  #  endif
  
  #  if defined(__APPLE__)
  #    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
  #      define PNG_NO_MMX_CODE
  #    endif
  #  endif
  
  #  if (defined(__MWERKS__) && ((__MWERKS__ < 0x0900) || macintosh))
  #    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
  #      define PNG_NO_MMX_CODE
  #    endif
  #  endif
  
  #  if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
  #    define PNG_MMX_CODE_SUPPORTED
  #  endif
  
  #endif
  /* end of obsolete code to be removed from libpng-1.4.0 */
  
  #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 */
  
  /* Added at libpng-1.2.6 */
  #if !defined(PNG_1_0_X)
  #ifndef PNG_SET_USER_LIMITS_SUPPORTED
  #if !defined(PNG_NO_SET_USER_LIMITS) && !defined(PNG_SET_USER_LIMITS_SUPPORTED)
  #  define PNG_SET_USER_LIMITS_SUPPORTED
  #endif
  #endif
  #endif /* PNG_1_0_X */
  
  /* Added at libpng-1.0.16 and 1.2.6.  To accept all valid PNGS no matter
   * how large, set these limits to 0x7fffffffL
   */
  #ifndef PNG_USER_WIDTH_MAX
  #  define PNG_USER_WIDTH_MAX 1000000L
  #endif
  #ifndef PNG_USER_HEIGHT_MAX
  #  define PNG_USER_HEIGHT_MAX 1000000L
  #endif
  
  /* 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 */
  /*
  #ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
  #  define PNG_READ_BIG_ENDIAN_SUPPORTED
  #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) */
  #ifdef PNG_SIZE_T
     typedef PNG_SIZE_T png_size_t;
  #  define png_sizeof(x) png_convert_size(sizeof (x))
  #else
     typedef size_t png_size_t;
  #  define png_sizeof(x) sizeof (x)
  #endif
  
  /* 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;
  
  #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
  /* SPC -  Is this stuff deprecated? */
  /* It'll be removed as of libpng-1.3.0 - GR-P */
  /* 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;
  #endif /* (PNG_1_0_X) || defined(PNG_1_2_X) */
  
  /*
   * 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)) || defined(_MSC_VER)
  #    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.
   */
  
  #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__) ))
  
  #  ifndef PNGAPI
  #     if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
  #        define PNGAPI __cdecl
  #     else
  #        define PNGAPI _cdecl
  #     endif
  #  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__)
  #      ifndef PNGAPI
  #         define PNGAPI _System
  #      endif
  #   else
  #      if 0 /* ... other platforms, with other meanings */
  #      endif
  #   endif
  #endif
  
  #ifndef PNGAPI
  #  define PNGAPI
  #endif
  #ifndef PNG_IMPEXP
  #  define PNG_IMPEXP
  #endif
  
  #ifdef PNG_BUILDSYMS
  #  ifndef PNG_EXPORT
  #    define PNG_EXPORT(type,symbol) PNG_FUNCTION_EXPORT symbol END
  #  endif
  #  ifdef PNG_USE_GLOBAL_ARRAYS
  #    ifndef PNG_EXPORT_VAR
  #      define PNG_EXPORT_VAR(type) PNG_DATA_EXPORT
  #    endif
  #  endif
  #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_snprintf _fsnprintf   /* Added to v 1.2.19 */
  #  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)
  #  ifndef PNG_NO_SNPRINTF
  #    ifdef _MSC_VER
  #      define png_snprintf _snprintf   /* Added to v 1.2.19 */
  #      define png_snprintf2 _snprintf
  #      define png_snprintf6 _snprintf
  #    else
  #      define png_snprintf snprintf   /* Added to v 1.2.19 */
  #      define png_snprintf2 snprintf
  #      define png_snprintf6 snprintf
  #    endif
  #  else
       /* You don't have or don't want to use snprintf().  Caution: Using
        * sprintf instead of snprintf exposes your application to accidental
        * or malevolent buffer overflows.  If you don't have snprintf()
        * as a general rule you should provide one (you can get one from
        * Portable OpenSSH). */
  #    define png_snprintf(s1,n,fmt,x1) sprintf(s1,fmt,x1)
  #    define png_snprintf2(s1,n,fmt,x1,x2) sprintf(s1,fmt,x1,x2)
  #    define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \
          sprintf(s1,fmt,x1,x2,x3,x4,x5,x6)
  #  endif
  #  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 > 65536L) && defined(PNG_MAX_MALLOC_64K)
  #  undef PNG_ZBUF_SIZE
  #  define PNG_ZBUF_SIZE 65536L
  #endif
  
  /* Added at libpng-1.2.8 */
  #endif /* PNG_VERSION_INFO_ONLY */
  
  #endif /* PNGCONF_H */
  