pngconf.h
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2D图形编程
开发平台:
Visual C++
- /* pngconf.c - machine configurable file for libpng
- libpng 1.0 beta 3 - version 0.89
- For conditions of distribution and use, see copyright notice in png.h
- Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- May 25, 1996
- */
- /* 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
- /* 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 extreamly 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 then the size of a row (compressed),
- it should not make much difference how big this is. */
- #define PNG_ZBUF_SIZE 8192
- /* While libpng currently uses zlib for it's compression, it has been designed
- to stand on it's own. Towards this end, there are two defines that are
- used to help portability between machines. To make it simpler to
- setup libpng on a machine, this currently uses zlib's definitions, so
- any changes should be made in zlib. Libpng will check zlib's settings
- and adjust it's own accordingly. */
- /* if you are running on a machine where you cannot allocate more then
- 64K of memory, 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_ALLOC_64K
- */
- #ifdef MAXSEG_64K
- #define PNG_MAX_ALLOC_64K
- #endif
- /* this protects us against compilers which 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_STDIO will
- prevent these from being compiled and used. */
- /* #define PNG_NO_STDIO */
- /* this macro protects us against machines that don't have function
- prototypes. If your compiler does not handle function prototypes,
- define this macro. 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
- #define PNGARG(arglist) OF(arglist)
- #else
- #ifdef _NO_PROTO
- #define PNGARG(arglist) ()
- #else
- #define PNGARG(arglist) arglist
- #endif /* _NO_PROTO */
- #endif /* OF */
- #endif /* PNGARG */
- //#define MACOS
- /* enough people need this for various reasons to include it here */
- #if !defined(MACOS) && !defined(RISCOS)
- #include <sys/types.h>
- #endif
- /* need the time information for reading tIME chunks */
- #include <time.h>
- /* for FILE. If you are not using standard io, you don't need this */
- #include <stdio.h>
- /* include setjmp.h for error handling */
- #include <setjmp.h>
- #ifdef BSD
- #include <strings.h>
- #else
- #include <string.h>
- #endif
- /* other defines for things like memory and the like can go here. These
- are the only files included in libpng, so if you need to change them,
- change them here. They are only included if PNG_INTERNAL is defined. */
- #ifdef PNG_INTERNAL
- #include <stdlib.h>
- #include <ctype.h>
- #include <math.h>
- /* other defines specific to compilers can go here. Try to keep
- them inside an appropriate ifdef/endif pair for portability */
- /* for some reason, Borland C++ defines memcmp, etc. in mem.h, not
- stdlib.h like it should (I think). Or perhaps this is a C++
- feature */
- #ifdef __TURBOC__
- #include <mem.h>
- #include "alloc.h"
- #endif
- #ifdef _MSC_VER
- #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 */
- #define PNG_DITHER_RED_BITS 5
- #define PNG_DITHER_GREEN_BITS 5
- #define PNG_DITHER_BLUE_BITS 5
- /* 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 get this
- value less then 8, and even that may not work (I haven't tested
- it). */
- #define PNG_MAX_GAMMA_8 11
- #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 want to use const, define PNG_USE_CONST here. It is not
- normally defined to make configuration easier, as it is not a
- critical part of the code.
- */
- #ifdef PNG_USE_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.
- */
- /* Any transformations you will not be using can be undef'ed here */
- #define PNG_PROGRESSIVE_READ_SUPPORTED
- #define PNG_READ_INTERLACING_SUPPORTED
- #define PNG_READ_EXPAND_SUPPORTED
- #define PNG_READ_SHIFT_SUPPORTED
- #define PNG_READ_PACK_SUPPORTED
- #define PNG_READ_BGR_SUPPORTED
- #define PNG_READ_SWAP_SUPPORTED
- #define PNG_READ_INVERT_SUPPORTED
- #define PNG_READ_DITHER_SUPPORTED
- #define PNG_READ_BACKGROUND_SUPPORTED
- #define PNG_READ_16_TO_8_SUPPORTED
- #define PNG_READ_FILLER_SUPPORTED
- #define PNG_READ_GAMMA_SUPPORTED
- #define PNG_READ_GRAY_TO_RGB_SUPPORTED
- #undef PNG_CORRECT_PALETTE_SUPPORTED
- #define PNG_WRITE_INTERLACING_SUPPORTED
- #define PNG_WRITE_SHIFT_SUPPORTED
- #define PNG_WRITE_PACK_SUPPORTED
- #define PNG_WRITE_BGR_SUPPORTED
- #define PNG_WRITE_SWAP_SUPPORTED
- #define PNG_WRITE_INVERT_SUPPORTED
- #define PNG_WRITE_FILLER_SUPPORTED
- #define PNG_WRITE_FLUSH_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) Others will just save time and make png_info
- smaller. OPT_PLTE only disables the optional palette in RGB
- and RGB Alpha images. */
- #define PNG_READ_gAMA_SUPPORTED
- #define PNG_READ_sBIT_SUPPORTED
- #define PNG_READ_cHRM_SUPPORTED
- #define PNG_READ_tRNS_SUPPORTED
- #define PNG_READ_bKGD_SUPPORTED
- #define PNG_READ_hIST_SUPPORTED
- #define PNG_READ_pHYs_SUPPORTED
- #define PNG_READ_oFFs_SUPPORTED
- #define PNG_READ_tIME_SUPPORTED
- #define PNG_READ_tEXt_SUPPORTED
- #define PNG_READ_zTXt_SUPPORTED
- #define PNG_READ_OPT_PLTE_SUPPORTED
- #define PNG_WRITE_gAMA_SUPPORTED
- #define PNG_WRITE_sBIT_SUPPORTED
- #define PNG_WRITE_cHRM_SUPPORTED
- #define PNG_WRITE_tRNS_SUPPORTED
- #define PNG_WRITE_bKGD_SUPPORTED
- #define PNG_WRITE_hIST_SUPPORTED
- #define PNG_WRITE_pHYs_SUPPORTED
- #define PNG_WRITE_oFFs_SUPPORTED
- #define PNG_WRITE_tIME_SUPPORTED
- #define PNG_WRITE_tEXt_SUPPORTED
- #define PNG_WRITE_zTXt_SUPPORTED
- /* 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. */
- 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 that might be very
- large using the far keyword. The Zlib version used must also support
- model independent data. As of version Zlib .95, the necessary changes
- have been made in Zlib. The USE_FAR_KEYWORD define triggers other
- changes that are needed. Most of the far keyword changes are hidden
- inside typedefs with suffix "f". Tim Wegner */
- /* SJT: Separate compiler dependencies */
- /* SJT: problem here is that zlib.h always defines FAR */
- #ifdef __BORLANDC__
- #if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__)
- #define LDATA 1
- #else
- #define LDATA 0
- #endif
- #if !defined(__WIN32__) && !defined(__FLAT__)
- #define PNG_MAX_MALLOC_64K
- #if (LDATA != 1)
- #ifndef FAR
- #define FAR __far
- #endif
- #define USE_FAR_KEYWORD
- #endif /* LDATA != 1 */
- /* SJT: 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.
- # define FARDATA FAR
- */
- #endif /* __WIN32__, __FLAT__ */
- #endif /* __BORLANDC__ */
- /* SJT: Suggest testing for specific compiler first before
- testing for FAR. The Watcom compiler defines both __MEDIUM__
- and M_I86MM, making reliance oncertain keywords suspect
- */
- /* MSC Medium model */
- #if defined(FAR)
- # if defined(M_I86MM)
- # define USE_FAR_KEYWORD
- # define FARDATA FAR /* SJT: added */
- # endif
- #endif
- /* SJT: default case */
- #ifndef FAR
- # define FAR
- #endif
- /* SJT: At this point FAR is always defined */
- /* not used anymore, but kept for compatability */
- typedef unsigned char FAR png_bytef;
- /* SJT: */
- #ifndef FARDATA
- #define FARDATA
- #endif
- /* End medium model changes to be in zconf.h */
- /* SJT: More typedefs */
- typedef void FAR * png_voidp;
- /* SJT: Add typedefs for pointers */
- 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;
- /* SJT: 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;
- /* SJT: 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 * png_zstreamp; /* zlib won't accept far z_stream */
- /* User may want to use these so not in PNG_INTERNAL. Any library functions
- that are passed far data must be model independent. */
- #if defined(USE_FAR_KEYWORD) /* memory model independent fns */
- # define png_strcpy _fstrcpy
- # define png_strcat _fstrcat
- # define png_strlen _fstrlen
- # define png_strcmp _fstrcmp
- # define png_memcmp _fmemcmp /* SJT: added */
- # define png_memcpy _fmemcpy
- # define png_memset _fmemset
- #else /* use the usual functions */
- # define png_strcpy strcpy
- # define png_strcat strcat
- # define png_strlen strlen
- # define png_strcmp strcmp
- # define png_memcmp memcmp /* SJT: added */
- # define png_memcpy memcpy
- # define png_memset memset
- #endif
- /* End of memory model independent support */
- #endif /* PNGCONF_H */