257 lines
8.7 KiB
C
257 lines
8.7 KiB
C
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/* pngconf.c - machine configurable file for libpng
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libpng 1.0 beta 2 - version 0.81
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For conditions of distribution and use, see copyright notice in png.h
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Copyright (c) 1995 Guy Eric Schalnat, Group 42, Inc.
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August 24, 1995
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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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#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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#define PNG_ZBUF_SIZE 8192
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/* While libpng currently uses zlib for it's compression, it has been designed
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to stand on it's own. Towards this end, there are two defines that are
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used to help portability between machines. To make it simpler to
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setup libpng on a machine, this currently uses zlib's definitions, so
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any changes should be made in zlib. Libpng will check zlib's settings
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and adjust it's own accordingly. */
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/* if you are running on a machine where you cannot allocate more then
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64K of memory, uncomment this. While libpng will not normally need
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that much memory in a chunk (unless you load up a very large file),
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zlib needs to know how big of a chunk it can use, and libpng thus
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makes sure to check any memory allocation to verify it will fit
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into memory.
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#define PNG_MAX_ALLOC_64K
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*/
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#ifdef MAXSEG_64K
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#define PNG_MAX_ALLOC_64K
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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. If your compiler does not handle function prototypes,
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define this macro. I've always been able to use _NO_PROTO as the
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indicator, but you may need to drag the empty declaration out in
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front of here, or change the ifdef to suit your own needs. */
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#ifndef PNGARG
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#ifdef OF
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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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/* enough people need this for various reasons to include it here */
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#ifndef MACOS
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#include <sys/types.h>
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#endif
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/* need the time information for reading tIME chunks */
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#include <time.h>
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/* for FILE. If you are not using standard io, you don't need this */
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#include <stdio.h>
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/* include setjmp.h for error handling */
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#include <setjmp.h>
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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. These
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are the only files included in libpng, so if you need to change them,
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change them here. They are only included if PNG_INTERNAL is defined. */
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#ifdef PNG_INTERNAL
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#include <stdlib.h>
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#include <ctype.h>
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#include <math.h>
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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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/* 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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#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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#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 get this
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value less then 8, and even that may not work (I haven't tested
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it). */
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#define PNG_MAX_GAMMA_8 11
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#endif /* PNG_INTERNAL */
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/* The following defines give you the ability to remove code
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from the library that you will not be using. I wish I
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could figure out how to automate this, but I can't do
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that without making it seriously hard on the users. So
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if you are not using an ability, change the #define to
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and #undef, and that part of the library will not be
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compiled. If your linker can't find a function, you
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may want to make sure the ability is defined here.
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Some of these depend upon some others being defined.
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I haven't figured out all the interactions here, so
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you may have to experiment awhile to get everything
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to compile.
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*/
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/* Any transformations you will not be using can be undef'ed here */
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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_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_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_INVERT_SUPPORTED
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#define PNG_WRITE_FILLER_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) Others will just save time and make png_info
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smaller. OPT_PLTE only disables the optional palette in RGB
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and RGB Alpha images. */
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#define PNG_READ_gAMA_SUPPORTED
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#define PNG_READ_sBIT_SUPPORTED
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#define PNG_READ_cHRM_SUPPORTED
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#define PNG_READ_tRNS_SUPPORTED
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#define PNG_READ_bKGD_SUPPORTED
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#define PNG_READ_hIST_SUPPORTED
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#define PNG_READ_pHYs_SUPPORTED
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#define PNG_READ_oFFs_SUPPORTED
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#define PNG_READ_tIME_SUPPORTED
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#define PNG_READ_tEXt_SUPPORTED
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#define PNG_READ_zTXt_SUPPORTED
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#define PNG_READ_OPT_PLTE_SUPPORTED
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#define PNG_WRITE_gAMA_SUPPORTED
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#define PNG_WRITE_sBIT_SUPPORTED
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#define PNG_WRITE_cHRM_SUPPORTED
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#define PNG_WRITE_tRNS_SUPPORTED
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#define PNG_WRITE_bKGD_SUPPORTED
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#define PNG_WRITE_hIST_SUPPORTED
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#define PNG_WRITE_pHYs_SUPPORTED
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#define PNG_WRITE_oFFs_SUPPORTED
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#define PNG_WRITE_tIME_SUPPORTED
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#define PNG_WRITE_tEXt_SUPPORTED
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#define PNG_WRITE_zTXt_SUPPORTED
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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
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as the numbers suggest (a png_uint_32 must be at least 32 bits long),
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but they don't have to be exactly that size. */
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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 that might be very
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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 .95, 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. Most of the far keyword changes are hidden
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inside typedefs with suffix "f". Tim Wegner */
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#if defined(FAR) && defined(M_I86MM) /* MSC Medium model */
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# define USE_FAR_KEYWORD
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#else
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# define FAR
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#endif
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typedef unsigned char FAR png_bytef;
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/* End medium model changes to be in zconf.h */
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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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#if defined(USE_FAR_KEYWORD) /* memory model independent fns */
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# define png_strcpy _fstrcpy
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# define png_strcat _fstrcat
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# define png_strlen _fstrlen
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# define png_strcmp _fstrcmp
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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 png_strcpy strcpy
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# define png_strcat strcat
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# define png_strlen strlen
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# define png_strcmp strcmp
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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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#endif /* PNGCONF_H */
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