493 lines
16 KiB
C
493 lines
16 KiB
C
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/* pngconf.c - machine configurable file for libpng
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*
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* libpng 1.00.97
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* For conditions of distribution and use, see copyright notice in png.h
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* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
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* Copyright (c) 1996, 1997 Andreas Dilger
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* May 28, 1997
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*/
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/* Any machine specific code is near the front of this file, so if you
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* are configuring libpng for a machine, you may want to read the section
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* starting here down to where it starts to typedef png_color, png_text,
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* and png_info.
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*/
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#ifndef PNGCONF_H
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#define PNGCONF_H
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/* This is the size of the compression buffer, and thus the size of
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* an IDAT chunk. Make this whatever size you feel is best for your
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* machine. One of these will be allocated per png_struct. When this
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* is full, it writes the data to the disk, and does some other
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* calculations. Making this an extreamly small size will slow
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* the library down, but you may want to experiment to determine
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* where it becomes significant, if you are concerned with memory
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* usage. Note that zlib allocates at least 32Kb also. For readers,
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* this describes the size of the buffer available to read the data in.
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* Unless this gets smaller then the size of a row (compressed),
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* it should not make much difference how big this is.
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*/
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#define PNG_ZBUF_SIZE 8192
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/* If you are running on a machine where you cannot allocate more
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* than 64K of memory at once, uncomment this. While libpng will not
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* normally need that much memory in a chunk (unless you load up a very
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* large file), zlib needs to know how big of a chunk it can use, and
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* libpng thus makes sure to check any memory allocation to verify it
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* will fit into memory.
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#define PNG_MAX_MALLOC_64K
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*/
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#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
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#define PNG_MAX_MALLOC_64K
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#endif
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/* This protects us against compilers which run on a windowing system
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* and thus don't have or would rather us not use the stdio types:
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* stdin, stdout, and stderr. The only one currently used is stderr
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* in png_error() and png_warning(). #defining PNG_NO_STDIO will
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* prevent these from being compiled and used.
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* #define PNG_NO_STDIO
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*/
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/* We still need stdio.h for FILE even when PNG_NO_STDIO is defined.
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*/
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#include <stdio.h>
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/* This macro protects us against machines that don't have function
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* prototypes (ie K&R style headers). If your compiler does not handle
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* function prototypes, define this macro and use the included ansi2knr.
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* I've always been able to use _NO_PROTO as the indicator, but you may
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* need to drag the empty declaration out in front of here, or change the
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* ifdef to suit your own needs.
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*/
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#ifndef PNGARG
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#ifdef OF /* zlib prototype munger */
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#define PNGARG(arglist) OF(arglist)
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#else
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#ifdef _NO_PROTO
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#define PNGARG(arglist) ()
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#else
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#define PNGARG(arglist) arglist
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#endif /* _NO_PROTO */
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#endif /* OF */
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#endif /* PNGARG */
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/* Try to determine if we are compiling on a Mac. Note that testing for
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* just __MWERKS__ is not good enough, because the Codewarrior is now used
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* on non-Mac platforms.
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*/
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#if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
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defined(THINK_C) || defined(__SC__)
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#define MACOS
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#endif
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/* enough people need this for various reasons to include it here */
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#if !defined(MACOS) && !defined(RISCOS)
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#include <sys/types.h>
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#endif
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/* This is an attempt to force a single setjmp behaviour on Linux. If
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* the X config stuff didn't define _BSD_SOURCE we wouldn't need this.
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*/
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#ifdef __linux__
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#ifdef _BSD_SOURCE
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#define _PNG_SAVE_BSD_SOURCE
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#undef _BSD_SOURCE
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#endif
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#ifdef _SETJMP_H
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__png.h__ already includes setjmp.h
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__dont__ include it again
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#endif
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#endif /* __linux__ */
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/* include setjmp.h for error handling */
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#include <setjmp.h>
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#ifdef __linux__
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#ifdef _PNG_SAVE_BSD_SOURCE
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#define _BSD_SOURCE
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#undef _PNG_SAVE_BSD_SOURCE
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#endif
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#endif /* __linux__ */
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#ifdef BSD
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#include <strings.h>
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#else
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#include <string.h>
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#endif
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/* Other defines for things like memory and the like can go here. */
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#ifdef PNG_INTERNAL
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#include <stdlib.h>
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/* The functions exported by PNG_EXTERN are PNG_INTERNAL functions, which
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* aren't usually used outside the library (as far as I know), so it is
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* debatable if they should be exported at all. In the future, when it is
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* possible to have run-time registry of chunk-handling functions, some of
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* these will be made available again.
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#define PNG_EXTERN extern
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*/
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#define PNG_EXTERN
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/* Other defines specific to compilers can go here. Try to keep
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* them inside an appropriate ifdef/endif pair for portability.
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*/
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#if defined(MACOS)
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/* We need to check that <math.h> hasn't already been included earlier
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* as it seems it doesn't agree with <fp.h>, yet we should really use
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* <fp.h> if possible.
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*/
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#if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
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#include <fp.h>
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#endif
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#else
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#include <math.h>
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#endif
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/* For some reason, Borland C++ defines memcmp, etc. in mem.h, not
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* stdlib.h like it should (I think). Or perhaps this is a C++
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* "feature"?
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*/
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#ifdef __TURBOC__
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#include <mem.h>
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#include "alloc.h"
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#endif
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#ifdef _MSC_VER
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#include <malloc.h>
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#endif
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/* This controls how fine the dithering gets. As this allocates
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* a largish chunk of memory (32K), those who are not as concerned
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* with dithering quality can decrease some or all of these.
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*/
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#define PNG_DITHER_RED_BITS 5
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#define PNG_DITHER_GREEN_BITS 5
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#define PNG_DITHER_BLUE_BITS 5
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/* This controls how fine the gamma correction becomes when you
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* are only interested in 8 bits anyway. Increasing this value
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* results in more memory being used, and more pow() functions
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* being called to fill in the gamma tables. Don't set this value
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* less then 8, and even that may not work (I haven't tested it).
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*/
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#define PNG_MAX_GAMMA_8 11
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/* This controls how much a difference in gamma we can tolerate before
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* we actually start doing gamma conversion.
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*/
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#define PNG_GAMMA_THRESHOLD 0.05
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#endif /* PNG_INTERNAL */
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/* The following uses const char * instead of char * for error
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* and warning message functions, so some compilers won't complain.
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* If you want to use const, define PNG_USE_CONST here. It is not
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* normally defined to make configuration easier, as it is not a
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* critical part of the code.
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*/
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#define PNG_USE_CONST
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#ifdef PNG_USE_CONST
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# define PNG_CONST const
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#else
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# define PNG_CONST
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#endif
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/* The following defines give you the ability to remove code from the
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* library that you will not be using. I wish I could figure out how to
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* automate this, but I can't do that without making it seriously hard
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* on the users. So if you are not using an ability, change the #define
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* to and #undef, and that part of the library will not be compiled. If
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* your linker can't find a function, you may want to make sure the
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* ability is defined here. Some of these depend upon some others being
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* defined. I haven't figured out all the interactions here, so you may
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* have to experiment awhile to get everything to compile. If you are
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* creating or using a shared library, you probably shouldn't touch this,
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* as it will affect the size of the structures, and this will cause bad
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* things to happen if the library and/or application ever change.
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*/
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/* Any transformations you will not be using can be undef'ed here */
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/* GR-P, 0.96a: Set "*FULLY_SUPPORTED as default but allow user
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to turn it off with "*NOT_FULLY_SUPPORTED" on the compile line,
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then pick and choose which ones to define without having to edit
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this file */
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#ifndef PNG_READ_NOT_FULLY_SUPPORTED
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#define PNG_READ_FULLY_SUPPORTED
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#endif
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#ifndef PNG_WRITE_NOT_FULLY_SUPPORTED
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#define PNG_WRITE_FULLY_SUPPORTED
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#endif
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#ifdef PNG_READ_FULLY_SUPPORTED
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#define PNG_PROGRESSIVE_READ_SUPPORTED
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#define PNG_READ_OPT_PLTE_SUPPORTED
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#define PNG_READ_INTERLACING_SUPPORTED
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#define PNG_READ_EXPAND_SUPPORTED
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#define PNG_READ_SHIFT_SUPPORTED
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#define PNG_READ_PACK_SUPPORTED
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#define PNG_READ_BGR_SUPPORTED
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#define PNG_READ_SWAP_SUPPORTED
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#define PNG_READ_PACKSWAP_SUPPORTED
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#define PNG_READ_INVERT_SUPPORTED
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#define PNG_READ_DITHER_SUPPORTED
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#define PNG_READ_BACKGROUND_SUPPORTED
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#define PNG_READ_16_TO_8_SUPPORTED
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#define PNG_READ_FILLER_SUPPORTED
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#define PNG_READ_GAMMA_SUPPORTED
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#define PNG_READ_GRAY_TO_RGB_SUPPORTED
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#define PNG_READ_SWAP_ALPHA_SUPPORTED
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#define PNG_READ_STRIP_ALPHA_SUPPORTED
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#endif /* PNG_READ_FULLY_SUPPORTED */
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#ifdef PNG_WRITE_FULLY_SUPPORTED
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#define PNG_WRITE_INTERLACING_SUPPORTED
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#define PNG_WRITE_SHIFT_SUPPORTED
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#define PNG_WRITE_PACK_SUPPORTED
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#define PNG_WRITE_BGR_SUPPORTED
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#define PNG_WRITE_SWAP_SUPPORTED
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#define PNG_WRITE_PACKSWAP_SUPPORTED
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#define PNG_WRITE_INVERT_SUPPORTED
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#define PNG_WRITE_FILLER_SUPPORTED /* This is the same as WRITE_STRIP_ALPHA */
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#define PNG_WRITE_FLUSH_SUPPORTED
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#define PNG_WRITE_SWAP_ALPHA_SUPPORTED
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#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
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#endif /*PNG_WRITE_FULLY_SUPPORTED */
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#define PNG_TIME_RFC1152_SUPPORTED
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/* These are currently experimental features */
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#undef PNG_READ_16_TO_8_ACCURATE_SHIFT_SUPPORTED /* very little testing */
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#undef PNG_READ_COMPOSITE_NODIV_SUPPORTED /* very little testing */
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/* This is only for PowerPC big-endian and 680x0 systems */
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#undef PNG_READ_BIG_ENDIAN_SUPPORTED /* some testing */
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/* These functions are turned off by default, as they will be phased out. */
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#undef PNG_USELESS_TESTS_SUPPORTED
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#undef PNG_CORRECT_PALETTE_SUPPORTED
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/* Any chunks you are not interested in, you can undef here. The
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* ones that allocate memory may be expecially important (hIST,
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* tEXt, zTXt, tRNS, pCAL). Others will just save time and make png_info
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* a bit smaller. OPT_PLTE only disables the optional palette in RGB
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* and RGBA images.
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*/
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#ifdef PNG_READ_FULLY_SUPPORTED
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#define PNG_READ_bKGD_SUPPORTED
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#define PNG_READ_cHRM_SUPPORTED
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#define PNG_READ_gAMA_SUPPORTED
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#define PNG_READ_hIST_SUPPORTED
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#define PNG_READ_oFFs_SUPPORTED
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#define PNG_READ_pCAL_SUPPORTED
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#define PNG_READ_pHYs_SUPPORTED
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#define PNG_READ_sBIT_SUPPORTED
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#define PNG_READ_sRGB_SUPPORTED
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#define PNG_READ_tEXt_SUPPORTED
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#define PNG_READ_tIME_SUPPORTED
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#define PNG_READ_tRNS_SUPPORTED
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#define PNG_READ_zTXt_SUPPORTED
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#endif /* PNG_READ_FULLY_SUPPORTED */
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#ifdef PNG_WRITE_FULLY_SUPPORTED
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#define PNG_WRITE_bKGD_SUPPORTED
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#define PNG_WRITE_cHRM_SUPPORTED
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#define PNG_WRITE_gAMA_SUPPORTED
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#define PNG_WRITE_hIST_SUPPORTED
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#define PNG_WRITE_oFFs_SUPPORTED
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#define PNG_WRITE_pCAL_SUPPORTED
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#define PNG_WRITE_pHYs_SUPPORTED
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#define PNG_WRITE_sBIT_SUPPORTED
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#define PNG_WRITE_sRGB_SUPPORTED
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#define PNG_WRITE_tEXt_SUPPORTED
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#define PNG_WRITE_tIME_SUPPORTED
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#define PNG_WRITE_tRNS_SUPPORTED
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#define PNG_WRITE_zTXt_SUPPORTED
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#endif /* PNG_WRITE_FULLY_SUPPORTED */
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/* need the time information for reading tIME chunks */
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#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
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#include <time.h>
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#endif
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/* Some typedefs to get us started. These should be safe on most of the
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* common platforms. The typedefs should be at least as large as the
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* numbers suggest (a png_uint_32 must be at least 32 bits long), but they
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* don't have to be exactly that size. Some compilers dislike passing
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* unsigned shorts as function parameters, so you may be better off using
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* unsigned int for png_uint_16. Likewise, for 64-bit systems, you may
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* want to have unsigned int for png_uint_32 instead of unsigned long.
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*/
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typedef unsigned long png_uint_32;
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typedef long png_int_32;
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typedef unsigned short png_uint_16;
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typedef short png_int_16;
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typedef unsigned char png_byte;
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/* This is usually size_t. It is typedef'ed just in case you need it to
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change (I'm not sure if you will or not, so I thought I'd be safe) */
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typedef size_t png_size_t;
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/* The following is needed for medium model support. It cannot be in the
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* PNG_INTERNAL section. Needs modification for other compilers besides
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* MSC. Model independent support declares all arrays and pointers to be
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* large using the far keyword. The zlib version used must also support
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* model independent data. As of version zlib 1.0.4, the necessary changes
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* have been made in zlib. The USE_FAR_KEYWORD define triggers other
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* changes that are needed. (Tim Wegner)
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*/
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/* Separate compiler dependencies (problem here is that zlib.h always
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defines FAR. (SJT) */
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#ifdef __BORLANDC__
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#if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__)
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#define LDATA 1
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#else
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#define LDATA 0
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#endif
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#if !defined(__WIN32__) && !defined(__FLAT__)
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#define PNG_MAX_MALLOC_64K
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#if (LDATA != 1)
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#ifndef FAR
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#define FAR __far
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#endif
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#define USE_FAR_KEYWORD
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#endif /* LDATA != 1 */
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/* Possibly useful for moving data out of default segment.
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* Uncomment it if you want. Could also define FARDATA as
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* const if your compiler supports it. (SJT)
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# define FARDATA FAR
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*/
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#endif /* __WIN32__, __FLAT__ */
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#endif /* __BORLANDC__ */
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/* Suggest testing for specific compiler first before testing for
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* FAR. The Watcom compiler defines both __MEDIUM__ and M_I86MM,
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* making reliance oncertain keywords suspect. (SJT)
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*/
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/* MSC Medium model */
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#if defined(FAR)
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# if defined(M_I86MM)
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# define USE_FAR_KEYWORD
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# define FARDATA FAR
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# include <dos.h>
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# endif
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#endif
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/* SJT: default case */
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#ifndef FAR
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# define FAR
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#endif
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/* At this point FAR is always defined */
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#ifndef FARDATA
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#define FARDATA
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#endif
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/* Add typedefs for pointers */
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typedef void FAR * png_voidp;
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typedef png_byte FAR * png_bytep;
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typedef png_uint_32 FAR * png_uint_32p;
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typedef png_int_32 FAR * png_int_32p;
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typedef png_uint_16 FAR * png_uint_16p;
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typedef png_int_16 FAR * png_int_16p;
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typedef PNG_CONST char FAR * png_const_charp;
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typedef char FAR * png_charp;
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typedef double FAR * png_doublep;
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/* Pointers to pointers; i.e. arrays */
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typedef png_byte FAR * FAR * png_bytepp;
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typedef png_uint_32 FAR * FAR * png_uint_32pp;
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typedef png_int_32 FAR * FAR * png_int_32pp;
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typedef png_uint_16 FAR * FAR * png_uint_16pp;
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typedef png_int_16 FAR * FAR * png_int_16pp;
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typedef PNG_CONST char FAR * FAR * png_const_charpp;
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typedef char FAR * FAR * png_charpp;
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typedef double FAR * FAR * png_doublepp;
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/* Pointers to pointers to pointers; i.e. pointer to array */
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typedef char FAR * FAR * FAR * png_charppp;
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/* libpng typedefs for types in zlib. If zlib changes
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* or another compression library is used, then change these.
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* Eliminates need to change all the source files.
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*/
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typedef charf * png_zcharp;
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typedef charf * FAR * png_zcharpp;
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typedef z_stream FAR * png_zstreamp;
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/* allow for compilation as dll under MS Windows */
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#ifdef __WIN32DLL__
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#define PNG_EXPORT(type,symbol) __declspec(dllexport) type symbol
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#endif
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/* allow for compilation as dll with BORLAND C++ 5.0 */
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#if defined(__BORLANDC__) && defined(_Windows) && defined(__DLL__)
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# define PNG_EXPORT(t,s) t _export s
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#endif
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/* allow for compilation as shared lib under BeOS */
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#ifdef __BEOSDLL__
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#define PNG_EXPORT(type,symbol) __declspec(export) type symbol
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#endif
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#ifndef PNG_EXPORT
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#define PNG_EXPORT(t,s) t s
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#endif
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/* User may want to use these so not in PNG_INTERNAL. Any library functions
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* that are passed far data must be model independent.
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*/
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#if defined(USE_FAR_KEYWORD) /* memory model independent fns */
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/* use this to make far-to-near assignments */
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# define CHECK 1
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# define NOCHECK 0
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# define CVT_PTR(ptr) (far_to_near(png_ptr,ptr,CHECK))
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# define CVT_PTR_NOCHECK(ptr) (far_to_near(png_ptr,ptr,NOCHECK))
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# define png_strlen _fstrlen
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# define png_memcmp _fmemcmp /* SJT: added */
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# define png_memcpy _fmemcpy
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# define png_memset _fmemset
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#else /* use the usual functions */
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# define CVT_PTR(ptr) (ptr)
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# define CVT_PTR_NOCHECK(ptr) (ptr)
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# define png_strlen strlen
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# define png_memcmp memcmp /* SJT: added */
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# define png_memcpy memcpy
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# define png_memset memset
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#endif
|
|
/* End of memory model independent support */
|
|
|
|
/* Just a double 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
|
|
|
|
#endif /* PNGCONF_H */
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|
|