pngconf.h

一个国人自己实现图像库的程序（有参考价值）

#ifndef PNG_NO_WRITE_sPLT
#  define PNG_WRITE_sPLT_SUPPORTED
#  ifndef PNG_sPLT_SUPPORTED
#    define PNG_sPLT_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_sRGB
#  define PNG_WRITE_sRGB_SUPPORTED
#  ifndef PNG_sRGB_SUPPORTED
#    define PNG_sRGB_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_tEXt
#  define PNG_WRITE_tEXt_SUPPORTED
#  ifndef PNG_tEXt_SUPPORTED
#    define PNG_tEXt_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_tIME
#  define PNG_WRITE_tIME_SUPPORTED
#  ifndef PNG_tIME_SUPPORTED
#    define PNG_tIME_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_tRNS
#  define PNG_WRITE_tRNS_SUPPORTED
#  ifndef PNG_tRNS_SUPPORTED
#    define PNG_tRNS_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_zTXt
#  define PNG_WRITE_zTXt_SUPPORTED
#  ifndef PNG_zTXt_SUPPORTED
#    define PNG_zTXt_SUPPORTED
#  endif
#endif
#ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
#  define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
#  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
#    define PNG_UNKNOWN_CHUNKS_SUPPORTED
#  endif
#  ifndef PNG_NO_HANDLE_AS_UNKNOWN
#     ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
#       define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
#     endif
#  endif
#endif
#if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
    defined(PNG_WRITE_zTXt_SUPPORTED)
#  define PNG_WRITE_TEXT_SUPPORTED
#  ifndef PNG_TEXT_SUPPORTED
#    define PNG_TEXT_SUPPORTED
#  endif
#endif

#endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */

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

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

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

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

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

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

/* Separate compiler dependencies (problem here is that zlib.h always
   defines FAR. (SJT) */
#ifdef __BORLANDC__
#  if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__)
#    define LDATA 1
#  else
#    define LDATA 0
#  endif
   /* GRR:  why is Cygwin in here?  Cygwin is not Borland C... */
#  if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__)
#    define PNG_MAX_MALLOC_64K
#    if (LDATA != 1)
#      ifndef FAR
#        define FAR __far
#      endif
#      define USE_FAR_KEYWORD
#    endif   /* LDATA != 1 */
     /* Possibly useful for moving data out of default segment.
      * Uncomment it if you want. Could also define FARDATA as
      * const if your compiler supports it. (SJT)
#    define FARDATA FAR
      */
#  endif  /* __WIN32__, __FLAT__, __CYGWIN__ */
#endif   /* __BORLANDC__ */


/* Suggest testing for specific compiler first before testing for
 * FAR.  The Watcom compiler defines both __MEDIUM__ and M_I86MM,
 * making reliance oncertain keywords suspect. (SJT)
 */

/* MSC Medium model */
#if defined(FAR)
#  if defined(M_I86MM)
#    define USE_FAR_KEYWORD
#    define FARDATA FAR
#    include <dos.h>
#  endif
#endif

/* SJT: default case */
#ifndef FAR
#  define FAR
#endif

/* At this point FAR is always defined */
#ifndef FARDATA
#  define FARDATA
#endif

/* Typedef for floating-point numbers that are converted
   to fixed-point with a multiple of 100,000, e.g., int_gamma */
typedef png_int_32 png_fixed_point;

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

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

#ifdef PNG_FLOATING_POINT_SUPPORTED
typedef double          FAR * png_doublep;
#endif

/* Pointers to pointers; i.e. arrays */
typedef png_byte        FAR * FAR * png_bytepp;
typedef png_uint_32     FAR * FAR * png_uint_32pp;
typedef png_int_32      FAR * FAR * png_int_32pp;
typedef png_uint_16     FAR * FAR * png_uint_16pp;
typedef png_int_16      FAR * FAR * png_int_16pp;
typedef PNG_CONST char  FAR * FAR * png_const_charpp;
typedef char            FAR * FAR * png_charpp;
typedef png_fixed_point FAR * FAR * png_fixed_point_pp;
#ifdef PNG_FLOATING_POINT_SUPPORTED
typedef double          FAR * FAR * png_doublepp;
#endif

/* Pointers to pointers to pointers; i.e., pointer to array */
typedef char            FAR * FAR * FAR * png_charppp;

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

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

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

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


#ifndef PNGAPI

#if defined(__MINGW32__) || defined(__CYGWIN__) && !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__) \
	  ) && !defined(__CYGWIN__))

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

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

#  if !defined(PNG_IMPEXP)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

#endif /* PNGCONF_H */