text: 
  /* pngconf.h - machine configurable file for libpng
   *
   * libpng version 1.4.0 - January 3, 2010
   * For conditions of distribution and use, see copyright notice in png.h
   * Copyright (c) 1998-2010 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.)
   *
   * This code is released under the libpng license.
   * For conditions of distribution and use, see the disclaimer
   * and license in png.h
   *
   */
  
  /* 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
  
  #ifndef PNG_NO_LIMITS_H
  #  include <limits.h>
  #endif
  
  /* Added at libpng-1.2.9 */
  
  /* config.h is created by and 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
   *
   * 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
  
  /*
   * 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__ */
  
  /* End of material added to libpng-1.2.8 */
  
  #ifndef PNG_VERSION_INFO_ONLY
  
  /* 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 in 1.4.0. */
  #ifdef PNG_ALLOW_BENIGN_ERRORS
  #  define png_benign_error png_warning
  #  define png_chunk_benign_error png_chunk_warning
  #else
  #  ifndef PNG_BENIGN_ERRORS_SUPPORTED
  #    define png_benign_error png_error
  #    define png_chunk_benign_error png_chunk_error
  #  endif
  #endif
  
  /* Added at libpng version 1.4.0 */
  #if !defined(PNG_NO_WARNINGS) && !defined(PNG_WARNINGS_SUPPORTED)
  #  define PNG_WARNINGS_SUPPORTED
  #endif
  
  /* Added at libpng version 1.4.0 */
  #if !defined(PNG_NO_ERROR_TEXT) && !defined(PNG_ERROR_TEXT_SUPPORTED)
  #  define PNG_ERROR_TEXT_SUPPORTED
  #endif
  
  /* Added at libpng version 1.4.0 */
  #if !defined(PNG_NO_CHECK_cHRM) && !defined(PNG_CHECK_cHRM_SUPPORTED)
  #  define PNG_CHECK_cHRM_SUPPORTED
  #endif
  
  /* Added at libpng version 1.4.0 */
  #if !defined(PNG_NO_ALIGNED_MEMORY) && !defined(PNG_ALIGNED_MEMORY_SUPPORTED)
  #  define PNG_ALIGNED_MEMORY_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 */
  #ifndef PNG_NO_MNG_FEATURES
  #  ifndef PNG_MNG_FEATURES_SUPPORTED
  #    define PNG_MNG_FEATURES_SUPPORTED
  #  endif
  #endif
  
  /* Added at libpng version 1.4.0 */
  #ifndef PNG_NO_FLOATING_POINT_SUPPORTED
  #  ifndef PNG_FLOATING_POINT_SUPPORTED
  #    define PNG_FLOATING_POINT_SUPPORTED
  #  endif
  #endif
  
  /* Added at libpng-1.4.0beta49 for testing (this test is no longer used
     in libpng and png_calloc() is always present)
   */
  #define PNG_CALLOC_SUPPORTED
  
  /* 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.
   */
  #ifdef __CYGWIN__
  #  ifdef ALL_STATIC
  #    ifdef PNG_BUILD_DLL
  #      undef PNG_BUILD_DLL
  #    endif
  #    ifdef PNG_USE_DLL
  #      undef PNG_USE_DLL
  #    endif
  #    ifdef PNG_DLL
  #      undef PNG_DLL
  #    endif
  #    ifndef PNG_STATIC
  #      define PNG_STATIC
  #    endif
  #  else
  #    ifdef PNG_BUILD_DLL
  #      ifdef PNG_STATIC
  #        undef PNG_STATIC
  #      endif
  #      ifdef PNG_USE_DLL
  #        undef PNG_USE_DLL
  #      endif
  #      ifndef PNG_DLL
  #        define PNG_DLL
  #      endif
  #    else
  #      ifdef PNG_STATIC
  #        ifdef PNG_USE_DLL
  #          undef PNG_USE_DLL
  #        endif
  #        ifdef PNG_DLL
  #          undef PNG_DLL
  #        endif
  #      else
  #        ifndef PNG_USE_DLL
  #          define PNG_USE_DLL
  #        endif
  #        ifndef 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(PNG_NO_STDIO) && !defined(PNG_STDIO_SUPPORTED)
  #  define PNG_STDIO_SUPPORTED
  #endif
  
  
  #ifdef PNG_BUILD_DLL
  #  if !defined(PNG_CONSOLE_IO_SUPPORTED) && !defined(PNG_NO_CONSOLE_IO)
  #    define PNG_NO_CONSOLE_IO
  #  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
  #    include <stdio.h>
  #  endif
  
  #if !(defined PNG_NO_CONSOLE_IO) && !defined(PNG_CONSOLE_IO_SUPPORTED)
  #  define PNG_CONSOLE_IO_SUPPORTED
  #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) ()
  #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)
  #  include <sys/types.h>
  #endif
  
  /* PNG_SETJMP_NOT_SUPPORTED and PNG_NO_SETJMP_SUPPORTED are deprecated. */
  #if !defined(PNG_NO_SETJMP) && \
      !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.
   *
   * You can bypass this test if you know that your application uses exactly
   * the same setjmp.h that was included when libpng was built.  Only define
   * PNG_SKIP_SETJMP_CHECK while building your application, prior to the
   * application's '#include "png.h"'. Don't define PNG_SKIP_SETJMP_CHECK
   * while building a separate libpng library for general use.
   */
  
  #  ifndef PNG_SKIP_SETJMP_CHECK
  #    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__ in libpng already includes setjmp.h;
             __dont__ include it again.;
  #      endif
  #    endif /* __linux__ */
  #  endif /* PNG_SKIP_SETJMP_CHECK */
  
     /* Include setjmp.h for error handling */
  #  include <setjmp.h>
  
  #  ifdef __linux__
  #    ifdef PNG_SAVE_BSD_SOURCE
  #      ifdef _BSD_SOURCE
  #        undef _BSD_SOURCE
  #      endif
  #      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.  */
  
  /* 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
  
  /* 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_CONST
  #  ifndef PNG_NO_CONST
  #    define PNG_CONST const
  #  else
  #    define PNG_CONST
  #  endif
  #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 PNG_NO_READ|WRITE_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 PNG_NO_READ|WRITE_TRANSFORMS
   * 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; PNG_*_TRANSFORMS_NOT_SUPPORTED deprecated in
   * 1.4.0)
   */
  
  /* 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
  
  #ifdef PNG_READ_SUPPORTED
  
  /* PNG_READ_TRANSFORMS_NOT_SUPPORTED is deprecated. */
  #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
  #if 0 /* removed from libpng-1.4.0 */
  #  ifndef PNG_NO_READ_DITHER
  #    define PNG_READ_DITHER_SUPPORTED
  #  endif
  #endif /* 0 */
  #  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 */
  
  /* PNG_PROGRESSIVE_READ_NOT_SUPPORTED is deprecated. */
  #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 define: */
  
  #define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */
  
  /* PNG_NO_SEQUENTIAL_READ_SUPPORTED is deprecated. */
  #if !defined(PNG_NO_SEQUENTIAL_READ) && \
      !defined(PNG_SEQUENTIAL_READ_SUPPORTED) && \
      !defined(PNG_NO_SEQUENTIAL_READ_SUPPORTED)
  #  define PNG_SEQUENTIAL_READ_SUPPORTED
  #endif
  
  #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_NO_GET_INT_32) || defined(PNG_READ_oFFS_SUPPORTED) || \
      defined(PNG_READ_pCAL_SUPPORTED)
  #  ifndef PNG_GET_INT_32_SUPPORTED
  #    define PNG_GET_INT_32_SUPPORTED
  #  endif
  #endif
  
  #endif /* PNG_READ_SUPPORTED */
  
  #ifdef PNG_WRITE_SUPPORTED
  
  /* PNG_WRITE_TRANSFORMS_NOT_SUPPORTED is deprecated. */
  #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)
      /* This is not required for PNG-compliant encoders, but can cause
       * trouble if left undefined
      */
  #  define PNG_WRITE_INTERLACING_SUPPORTED
  #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_NO_SAVE_INT_32) || defined(PNG_WRITE_oFFS_SUPPORTED) || \
      defined(PNG_WRITE_pCAL_SUPPORTED)
  #  ifndef PNG_SAVE_INT_32_SUPPORTED
  #    define PNG_SAVE_INT_32_SUPPORTED
  #  endif
  #endif
  
  #endif /* PNG_WRITE_SUPPORTED */
  
  #define PNG_NO_ERROR_NUMBERS
  
  #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
  
  #if defined(PNG_STDIO_SUPPORTED) && !defined(PNG_TIME_RFC1123_SUPPORTED)
  #  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
  
  /* Added at libpng-1.2.0 */
  #if !defined(PNG_NO_USER_MEM) && !defined(PNG_USER_MEM_SUPPORTED)
  #  define PNG_USER_MEM_SUPPORTED
  #endif
  
  /* Added at libpng-1.2.6 */
  #ifndef PNG_SET_USER_LIMITS_SUPPORTED
  #  ifndef PNG_NO_SET_USER_LIMITS
  #    define PNG_SET_USER_LIMITS_SUPPORTED
  #  endif
  #endif
  
  /* 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
  
  /* Added at libpng-1.4.0 */
  #ifndef PNG_USER_CHUNK_CACHE_MAX
  #  define PNG_USER_CHUNK_CACHE_MAX 0x7fffffffL
  #endif
  
  /* Added at libpng-1.4.0 */
  #if !defined(PNG_NO_IO_STATE) && !defined(PNG_IO_STATE_SUPPORTED)
  #  define PNG_IO_STATE_SUPPORTED
  #endif
  
  #ifndef PNG_LITERAL_SHARP
  #  define PNG_LITERAL_SHARP 0x23
  #endif
  #ifndef PNG_LITERAL_LEFT_SQUARE_BRACKET
  #  define PNG_LITERAL_LEFT_SQUARE_BRACKET 0x5b
  #endif
  #ifndef PNG_LITERAL_RIGHT_SQUARE_BRACKET
  #  define PNG_LITERAL_RIGHT_SQUARE_BRACKET 0x5d
  #endif
  #ifndef PNG_STRING_NEWLINE
  #define PNG_STRING_NEWLINE "\n"
  #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
  */
  
  #if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS)
  #  define PNG_USE_READ_MACROS
  #endif
  
  /* Buggy compilers (e.g., gcc 2.7.2.2) need PNG_NO_POINTER_INDEXING */
  
  #if !defined(PNG_NO_POINTER_INDEXING) && \
      !defined(PNG_POINTER_INDEXING_SUPPORTED)
  #  define PNG_POINTER_INDEXING_SUPPORTED
  #endif
  
  
  /* 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.
   */
  
  /* 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-1.4.0.
   */
  
  /* PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED is deprecated. */
  #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
  
  /* PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED is deprecated. */
  #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_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 */
  
  #ifndef PNG_NO_READ_UNKNOWN_CHUNKS
  #  define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
  #  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
  #    define PNG_UNKNOWN_CHUNKS_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_HANDLE_AS_UNKNOWN
  #  ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
  #    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
  #  endif
  #endif
  
  #ifdef PNG_WRITE_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
  #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
  
  #ifdef PNG_WRITE_tIME_SUPPORTED
  #  ifndef PNG_NO_CONVERT_tIME
  #    ifndef _WIN32_WCE
  /*   The "tm" structure is not supported on WindowsCE */
  #      ifndef PNG_CONVERT_tIME_SUPPORTED
  #        define PNG_CONVERT_tIME_SUPPORTED
  #      endif
  #   endif
  #  endif
  #endif
  
  #endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
  
  #if !defined(PNG_NO_WRITE_FILTER) && !defined(PNG_WRITE_FILTER_SUPPORTED)
  #  define PNG_WRITE_FILTER_SUPPORTED
  #endif
  
  #ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
  #  define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
  #  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
  #    define PNG_UNKNOWN_CHUNKS_SUPPORTED
  #  endif
  #endif
  #ifndef PNG_NO_HANDLE_AS_UNKNOWN
  #  ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
  #    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
  #  endif
  #endif
  #endif /* PNG_WRITE_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 converting tIME chunks */
  #ifdef PNG_CONVERT_tIME_SUPPORTED
       /* "time.h" functions are not supported on WindowsCE */
  #    include <time.h>
  #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.
   */
  
  #if defined(INT_MAX) && (INT_MAX > 0x7ffffffeL)
  typedef unsigned int png_uint_32;
  typedef int png_int_32;
  #else
  typedef unsigned long png_uint_32;
  typedef long png_int_32;
  #endif
  typedef unsigned short png_uint_16;
  typedef short png_int_16;
  typedef unsigned char png_byte;
  
  #ifdef PNG_NO_SIZE_T
     typedef unsigned int png_size_t;
  #else
     typedef size_t png_size_t;
  #endif
  #define png_sizeof(x) sizeof(x)
  
  /* The following is needed for medium model support.  It cannot be in the
   * pngpriv.h header.  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 */
  #ifdef FAR
  #  ifdef M_I86MM
  #    define USE_FAR_KEYWORD
  #    define FARDATA FAR
  #    include <dos.h>
  #  endif
  #endif
  
  /* SJT: default case */
  #ifndef FAR
  #  define FAR
  #endif
  
  /* At this point FAR is always defined */
  #ifndef FARDATA
  #  define FARDATA
  #endif
  
  /* Typedef for floating-point numbers that are converted
     to fixed-point with a multiple of 100,000, e.g., 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
  typedef FILE                * png_FILE_p;
  #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;
  
  /* 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
  
  #ifdef __CYGWIN__
  #  undef PNGAPI
  #  define PNGAPI __cdecl
  #  undef PNG_IMPEXP
  #  define PNG_IMPEXP
  #endif
  
  #define PNG_USE_LOCAL_ARRAYS /* Not used in libpng, defined for legacy apps */
  
  /* 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
  
  #  ifndef 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
  #         ifdef 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
  
  #    ifndef PNG_IMPEXP
  #      ifdef 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
  #endif
  
  #ifndef PNG_EXPORT
  #  define PNG_EXPORT(type,symbol) PNG_IMPEXP type PNGAPI symbol
  #endif
  
  /* Support for compiler specific function attributes.  These are used
   * so that where compiler support is available incorrect use of API
   * functions in png.h will generate compiler warnings.
   *
   * Added at libpng-1.2.41.
   */
  
  #ifndef PNG_NO_PEDANTIC_WARNINGS
  #  ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
  #    define PNG_PEDANTIC_WARNINGS_SUPPORTED
  #  endif
  #endif
  
  #ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
  /* Support for compiler specific function attributes.  These are used
   * so that where compiler support is available incorrect use of API
   * functions in png.h will generate compiler warnings.  Added at libpng
   * version 1.2.41.
   */
  #  ifdef __GNUC__
  #    ifndef PNG_USE_RESULT
  #      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
  #    endif
  #    ifndef PNG_NORETURN
  #      define PNG_NORETURN   __attribute__((__noreturn__))
  #    endif
  #    ifndef PNG_ALLOCATED
  #      define PNG_ALLOCATED  __attribute__((__malloc__))
  #    endif
  
      /* This specifically protects structure members that should only be
       * accessed from within the library, therefore should be empty during
       * a library build.
       */
  #    ifndef PNG_DEPRECATED
  #      define PNG_DEPRECATED __attribute__((__deprecated__))
  #    endif
  #    ifndef PNG_DEPSTRUCT
  #      define PNG_DEPSTRUCT  __attribute__((__deprecated__))
  #    endif
  #    ifndef PNG_PRIVATE
  #      if 0 /* Doesn't work so we use deprecated instead*/
  #        define PNG_PRIVATE \
            __attribute__((warning("This function is not exported by libpng.")))
  #      else
  #        define PNG_PRIVATE \
            __attribute__((__deprecated__))
  #      endif
  #    endif /* PNG_PRIVATE */
  #  endif /* __GNUC__ */
  #endif /* PNG_PEDANTIC_WARNINGS */
  
  #ifndef PNG_DEPRECATED
  #  define PNG_DEPRECATED  /* Use of this function is deprecated */
  #endif
  #ifndef PNG_USE_RESULT
  #  define PNG_USE_RESULT  /* The result of this function must be checked */
  #endif
  #ifndef PNG_NORETURN
  #  define PNG_NORETURN    /* This function does not return */
  #endif
  #ifndef PNG_ALLOCATED
  #  define PNG_ALLOCATED   /* The result of the function is new memory */
  #endif
  #ifndef PNG_DEPSTRUCT
  #  define PNG_DEPSTRUCT   /* Access to this struct member is deprecated */
  #endif
  #ifndef PNG_PRIVATE
  #  define PNG_PRIVATE     /* This is a private libpng function */
  #endif
  
  /* Users may want to use these so they are not private.  Any library
   * functions that are passed far data must be model-independent.
   */
  
  /* memory model/platform independent fns */
  #ifndef PNG_ABORT
  #  ifdef _WINDOWS_
  #     define PNG_ABORT() ExitProcess(0)
  #  else
  #     define PNG_ABORT() abort()
  #  endif
  #endif
  
  #ifdef USE_FAR_KEYWORD
  /* 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_strncpy _fstrncpy   /* Added to v 1.2.6 */
  #  define png_strlen  _fstrlen
  #  define png_memcmp  _fmemcmp    /* SJT: added */
  #  define png_memcpy  _fmemcpy
  #  define png_memset  _fmemset
  #  define png_sprintf sprintf
  #else
  #  ifdef _WINDOWS_  /* Favor Windows over C runtime fns */
  #    define CVT_PTR(ptr)         (ptr)
  #    define CVT_PTR_NOCHECK(ptr) (ptr)
  #    define png_strcpy  lstrcpyA
  #    define png_strncpy lstrcpynA
  #    define png_strlen  lstrlenA
  #    define png_memcmp  memcmp
  #    define png_memcpy  CopyMemory
  #    define png_memset  memset
  #    define png_sprintf wsprintfA
  #  else
  #    define CVT_PTR(ptr)         (ptr)
  #    define CVT_PTR_NOCHECK(ptr) (ptr)
  #    define png_strcpy  strcpy
  #    define png_strncpy strncpy     /* Added to v 1.2.6 */
  #    define png_strlen  strlen
  #    define png_memcmp  memcmp      /* SJT: added */
  #    define png_memcpy  memcpy
  #    define png_memset  memset
  #    define png_sprintf sprintf
  #    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
  #  endif
  #endif
  
  /* png_alloc_size_t is guaranteed to be no smaller than png_size_t,
   * and no smaller than png_uint_32.  Casts from png_size_t or png_uint_32
   * to png_alloc_size_t are not necessary; in fact, it is recommended
   * not to use them at all so that the compiler can complain when something
   * turns out to be problematic.
   * Casts in the other direction (from png_alloc_size_t to png_size_t or
   * png_uint_32) should be explicitly applied; however, we do not expect
   * to encounter practical situations that require such conversions.
   */
  #if defined(__TURBOC__) && !defined(__FLAT__)
  #  define  png_mem_alloc farmalloc
  #  define  png_mem_free  farfree
     typedef unsigned long png_alloc_size_t;
  #else
  #  if defined(_MSC_VER) && defined(MAXSEG_64K)
  #    define  png_mem_alloc(s) halloc(s, 1)
  #    define  png_mem_free     hfree
       typedef unsigned long    png_alloc_size_t;
  #  else
  #    if defined(_WINDOWS_) && (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL)
  #      define  png_mem_alloc(s) HeapAlloc(GetProcessHeap(), 0, s)
  #      define  png_mem_free(p)  HeapFree(GetProcessHeap(), 0, p)
         typedef DWORD            png_alloc_size_t;
  #    else
  #      define  png_mem_alloc malloc
  #      define  png_mem_free  free
         typedef png_size_t    png_alloc_size_t;
  #    endif
  #  endif
  #endif
  /* End of memory model/platform 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 */
  