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   png_color_16p *trans_values));
#endif

#if defined(PNG_tRNS_SUPPORTED)
extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
   png_infop info_ptr, png_bytep trans, int num_trans,
   png_color_16p trans_values));
#endif

#if defined(PNG_tRNS_SUPPORTED)
#endif

#if defined(PNG_sCAL_SUPPORTED)
#ifdef PNG_FLOATING_POINT_SUPPORTED
extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
   png_infop info_ptr, int *unit, double *width, double *height));
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
   png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
#endif
#endif
#endif /* PNG_sCAL_SUPPORTED */

#if defined(PNG_sCAL_SUPPORTED)
#ifdef PNG_FLOATING_POINT_SUPPORTED
extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
   png_infop info_ptr, int unit, double width, double height));
#else
#ifdef PNG_FIXED_POINT_SUPPORTED
extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
   png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
#endif
#endif
#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */

#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
/* provide a list of chunks and how they are to be handled, if the built-in
   handling or default unknown chunk handling is not desired.  Any chunks not
   listed will be handled in the default manner.  The IHDR and IEND chunks
   must not be listed.
      keep = 0: follow default behaviour
           = 1: do not keep
           = 2: keep only if safe-to-copy
           = 3: keep even if unsafe-to-copy
*/
extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
   png_ptr, int keep, png_bytep chunk_list, int num_chunks));
extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
extern PNG_EXPORT(void, png_set_unknown_chunk_location)
   PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
   png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
#endif
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
   chunk_name));
#endif

/* Png_free_data() will turn off the "valid" flag for anything it frees.
   If you need to turn it off for a chunk that your application has freed,
   you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
   png_infop info_ptr, int mask));

#if defined(PNG_INFO_IMAGE_SUPPORTED)
/* The "params" pointer is currently not used and is for future expansion. */
extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
                        png_infop info_ptr,
                        int transforms,
                        png_voidp params));
extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
                        png_infop info_ptr,
                        int transforms,
                        png_voidp params));
#endif

/* Define PNG_DEBUG at compile time for debugging information.  Higher
 * numbers for PNG_DEBUG mean more debugging information.  This has
 * only been added since version 0.95 so it is not implemented throughout
 * libpng yet, but more support will be added as needed.
 */
#ifdef PNG_DEBUG
#if (PNG_DEBUG > 0)
#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
#include <crtdbg.h>
#if (PNG_DEBUG > 1)
#define png_debug(l,m)  _RPT0(_CRT_WARN,m)
#define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m,p1)
#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
#endif
#else /* PNG_DEBUG_FILE || !_MSC_VER */
#ifndef PNG_DEBUG_FILE
#define PNG_DEBUG_FILE stderr
#endif /* PNG_DEBUG_FILE */
#if (PNG_DEBUG > 1)
#define png_debug(l,m) \
{ \
     int num_tabs=l; \
     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
}
#define png_debug1(l,m,p1) \
{ \
     int num_tabs=l; \
     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
}
#define png_debug2(l,m,p1,p2) \
{ \
     int num_tabs=l; \
     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
}
#endif /* (PNG_DEBUG > 1) */
#endif /* _MSC_VER */
#endif /* (PNG_DEBUG > 0) */
#endif /* PNG_DEBUG */
#ifndef png_debug
#define png_debug(l, m)