pngconf.h

It was built with libpng version 1.2.35, and is running with libpng version 1.2.35

/* 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
*/