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565 lines
18 KiB
565 lines
18 KiB
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/* pngconf.h - machine configurable file for libpng |
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* |
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* libpng 1.0.1 |
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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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* Copyright (c) 1998, Glenn Randers-Pehrson |
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* March 9, 1998 |
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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 extremely 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 than 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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#ifndef PNG_ZBUF_SIZE |
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#define PNG_ZBUF_SIZE 8192 |
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#endif |
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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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#ifndef PNG_NO_STDIO |
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#include <stdio.h> |
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#endif |
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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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#ifndef MACOS |
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#if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ |
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defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) |
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#define MACOS |
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#endif |
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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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/* Codewarrior on NT has linking problems without this. */ |
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#if defined(__MWERKS__) && defined(WIN32) |
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#define PNG_ALWAYS_EXTERN |
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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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#ifndef PNG_DITHER_RED_BITS |
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#define PNG_DITHER_RED_BITS 5 |
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#endif |
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#ifndef PNG_DITHER_GREEN_BITS |
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#define PNG_DITHER_GREEN_BITS 5 |
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#endif |
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#ifndef PNG_DITHER_BLUE_BITS |
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#define PNG_DITHER_BLUE_BITS 5 |
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#endif |
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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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#ifndef PNG_MAX_GAMMA_8 |
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#define PNG_MAX_GAMMA_8 11 |
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#endif |
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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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#ifndef PNG_GAMMA_THRESHOLD |
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#define PNG_GAMMA_THRESHOLD 0.05 |
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#endif |
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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 do not want to use const, define PNG_NO_CONST here. |
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*/ |
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#ifndef PNG_NO_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 "*TRANSFORMS_SUPPORTED as default but allow user |
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to turn it off with "*TRANSFORMS_NOT_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. It is safe to use the *TRANSFORMS_NOT_SUPPORTED if you |
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only want to have a png-compliant reader/writer but don't need |
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any of the extra transformations. This saves about 80 kbytes in a |
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typical installation of the library. |
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*/ |
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#ifndef PNG_READ_TRANSFORMS_NOT_SUPPORTED |
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#define PNG_READ_TRANSFORMS_SUPPORTED |
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#endif |
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#ifndef PNG_WRITE_TRANSFORMS_NOT_SUPPORTED |
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#define PNG_WRITE_TRANSFORMS_SUPPORTED |
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#endif |
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#ifdef PNG_READ_TRANSFORMS_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_INVERT_ALPHA_SUPPORTED |
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#define PNG_READ_STRIP_ALPHA_SUPPORTED |
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#define PNG_READ_USER_TRANSFORM_SUPPORTED |
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/* the following aren't implemented yet |
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#define PNG_READ_RGB_TO_GRAY_SUPPORTED |
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*/ |
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#endif /* PNG_READ_TRANSFORMS_SUPPORTED */ |
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#ifndef PNG_PROGRESSIVE_READ_NOT_SUPPORTED /* if you don't do progressive */ |
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#define PNG_PROGRESSIVE_READ_SUPPORTED /* reading. This is not talking */ |
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#endif /* about interlacing capability! You'll */ |
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/* still have interlacing unless you change the following line: */ |
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#define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */ |
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#define PNG_READ_COMPOSITE_NODIV_SUPPORTED /* well tested on Intel and SGI */ |
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#ifdef PNG_WRITE_TRANSFORMS_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_INVERT_ALPHA_SUPPORTED |
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#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
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#define PNG_WRITE_USER_TRANSFORM_SUPPORTED |
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#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */ |
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#define PNG_WRITE_INTERLACING_SUPPORTED /* not required for PNG-compliant |
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encoders, but can cause trouble |
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if left undefined */ |
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#if !defined(PNG_NO_STDIO) |
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#define PNG_TIME_RFC1123_SUPPORTED |
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#endif |
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/* This adds extra functions in pngget.c for accessing data from the |
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* info pointer (added in version 0.99) |
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* png_get_image_width() |
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* png_get_image_height() |
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* png_get_bit_depth() |
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* png_get_color_type() |
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* png_get_compression_type() |
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* png_get_filter_type() |
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* png_get_interlace_type() |
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* png_get_pixel_aspect_ratio() |
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* png_get_pixels_per_meter() |
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* png_get_x_offset_pixels() |
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* png_get_y_offset_pixels() |
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* png_get_x_offset_microns() |
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* png_get_y_offset_microns() |
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*/ |
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#if !defined(PNG_NO_EASY_ACCESS) |
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#define PNG_EASY_ACCESS_SUPPORTED |
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#endif |
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/* These are currently experimental features, define them if you want */ |
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/* very little testing */ |
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/* |
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#define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED |
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*/ |
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/* This is only for PowerPC big-endian and 680x0 systems */ |
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/* some testing */ |
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/* |
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#define PNG_READ_BIG_ENDIAN_SUPPORTED |
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*/ |
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/* These functions are turned off by default, as they will be phased out. */ |
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/* |
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#define PNG_USELESS_TESTS_SUPPORTED |
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#define PNG_CORRECT_PALETTE_SUPPORTED |
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*/ |
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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. |
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*/ |
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#ifndef PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED |
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#define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED |
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#endif |
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#ifndef PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED |
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#define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED |
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#endif |
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#ifdef PNG_READ_ANCILLARY_CHUNKS_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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#define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the optional */ |
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/* PLTE chunk in RGB and RGBA images */ |
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#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */ |
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#ifdef PNG_WRITE_ANCILLARY_CHUNKS_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_ANCILLARY_CHUNKS_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(type,symbol) type _export symbol |
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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(type,symbol) type symbol |
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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) (png_far_to_near(png_ptr,ptr,CHECK)) |
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# define CVT_PTR_NOCHECK(ptr) (png_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 |
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/* End of memory model independent support */ |
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/* Just a double check that someone hasn't tried to define something |
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* contradictory. |
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*/ |
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#if (PNG_ZBUF_SIZE > 65536) && defined(PNG_MAX_MALLOC_64K) |
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#undef PNG_ZBUF_SIZE |
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#define PNG_ZBUF_SIZE 65536 |
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#endif |
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#endif /* PNGCONF_H */ |
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