www.pudn.com > Image_png.rar > pngconf.h
/* pngconf.h - machine configurable file for libpng * * libpng 1.0.1 * For conditions of distribution and use, see copyright notice in png.h * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. * Copyright (c) 1996, 1997 Andreas Dilger * Copyright (c) 1998, Glenn Randers-Pehrson * March 15, 1998 */ /* Any machine specific code is near the front of this file, so if you * are configuring libpng for a machine, you may want to read the section * starting here down to where it starts to typedef png_color, png_text, * and png_info. */ #ifndef PNGCONF_H #define PNGCONF_H /* This is the size of the compression buffer, and thus the size of * an IDAT chunk. Make this whatever size you feel is best for your * machine. One of these will be allocated per png_struct. When this * is full, it writes the data to the disk, and does some other * calculations. Making this an extremely small size will slow * the library down, but you may want to experiment to determine * where it becomes significant, if you are concerned with memory * usage. Note that zlib allocates at least 32Kb also. For readers, * this describes the size of the buffer available to read the data in. * Unless this gets smaller than the size of a row (compressed), * it should not make much difference how big this is. */ #ifndef PNG_ZBUF_SIZE #define PNG_ZBUF_SIZE 8192 #endif /* If you are running on a machine where you cannot allocate more * than 64K of memory at once, uncomment this. While libpng will not * normally need that much memory in a chunk (unless you load up a very * large file), zlib needs to know how big of a chunk it can use, and * libpng thus makes sure to check any memory allocation to verify it * will fit into memory. #define PNG_MAX_MALLOC_64K */ #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) #define PNG_MAX_MALLOC_64K #endif /* This protects us against compilers which run on a windowing system * and thus don't have or would rather us not use the stdio types: * stdin, stdout, and stderr. The only one currently used is stderr * in png_error() and png_warning(). #defining PNG_NO_STDIO will * prevent these from being compiled and used. * #define PNG_NO_STDIO */ #ifndef PNG_NO_STDIO #include#endif /* This macro protects us against machines that don't have function * prototypes (ie K&R style headers). If your compiler does not handle * function prototypes, define this macro and use the included ansi2knr. * I've always been able to use _NO_PROTO as the indicator, but you may * need to drag the empty declaration out in front of here, or change the * ifdef to suit your own needs. */ #ifndef PNGARG #ifdef OF /* zlib prototype munger */ #define PNGARG(arglist) OF(arglist) #else #ifdef _NO_PROTO #define PNGARG(arglist) () #else #define PNGARG(arglist) arglist #endif /* _NO_PROTO */ #endif /* OF */ #endif /* PNGARG */ /* Try to determine if we are compiling on a Mac. Note that testing for * just __MWERKS__ is not good enough, because the Codewarrior is now used * on non-Mac platforms. */ #ifndef MACOS #if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) #define MACOS #endif #endif /* enough people need this for various reasons to include it here */ #if !defined(MACOS) && !defined(RISCOS) #include #endif /* This is an attempt to force a single setjmp behaviour on Linux. If * the X config stuff didn't define _BSD_SOURCE we wouldn't need this. */ #ifdef __linux__ #ifdef _BSD_SOURCE #define _PNG_SAVE_BSD_SOURCE #undef _BSD_SOURCE #endif #ifdef _SETJMP_H __png.h__ already includes setjmp.h __dont__ include it again #endif #endif /* __linux__ */ /* include setjmp.h for error handling */ #include #ifdef __linux__ #ifdef _PNG_SAVE_BSD_SOURCE #define _BSD_SOURCE #undef _PNG_SAVE_BSD_SOURCE #endif #endif /* __linux__ */ #ifdef BSD #include #else #include #endif /* Other defines for things like memory and the like can go here. */ #ifdef PNG_INTERNAL #include /* The functions exported by PNG_EXTERN are PNG_INTERNAL functions, which * aren't usually used outside the library (as far as I know), so it is * debatable if they should be exported at all. In the future, when it is * possible to have run-time registry of chunk-handling functions, some of * these will be made available again. #define PNG_EXTERN extern */ #define PNG_EXTERN /* Other defines specific to compilers can go here. Try to keep * them inside an appropriate ifdef/endif pair for portability. */ #if defined(MACOS) /* We need to check that hasn't already been included earlier * as it seems it doesn't agree with , yet we should really use * if possible. */ #if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) #include #endif #else #include #endif /* Codewarrior on NT has linking problems without this. */ #if defined(__MWERKS__) && defined(WIN32) #define PNG_ALWAYS_EXTERN #endif /* For some reason, Borland C++ defines memcmp, etc. in mem.h, not * stdlib.h like it should (I think). Or perhaps this is a C++ * "feature"? */ #ifdef __TURBOC__ #include #include "alloc.h" #endif #ifdef _MSC_VER #include #endif /* This controls how fine the dithering gets. As this allocates * a largish chunk of memory (32K), those who are not as concerned * with dithering quality can decrease some or all of these. */ #ifndef PNG_DITHER_RED_BITS #define PNG_DITHER_RED_BITS 5 #endif #ifndef PNG_DITHER_GREEN_BITS #define PNG_DITHER_GREEN_BITS 5 #endif #ifndef PNG_DITHER_BLUE_BITS #define PNG_DITHER_BLUE_BITS 5 #endif /* This controls how fine the gamma correction becomes when you * are only interested in 8 bits anyway. Increasing this value * results in more memory being used, and more pow() functions * being called to fill in the gamma tables. Don't set this value * less then 8, and even that may not work (I haven't tested it). */ #ifndef PNG_MAX_GAMMA_8 #define PNG_MAX_GAMMA_8 11 #endif /* This controls how much a difference in gamma we can tolerate before * we actually start doing gamma conversion. */ #ifndef PNG_GAMMA_THRESHOLD #define PNG_GAMMA_THRESHOLD 0.05 #endif #endif /* PNG_INTERNAL */ /* The following uses const char * instead of char * for error * and warning message functions, so some compilers won't complain. * If you do not want to use const, define PNG_NO_CONST here. */ #ifndef PNG_NO_CONST # define PNG_CONST const #else # define PNG_CONST #endif /* The following defines give you the ability to remove code from the * library that you will not be using. I wish I could figure out how to * automate this, but I can't do that without making it seriously hard * on the users. So if you are not using an ability, change the #define * to and #undef, and that part of the library will not be compiled. If * your linker can't find a function, you may want to make sure the * ability is defined here. Some of these depend upon some others being * defined. I haven't figured out all the interactions here, so you may * have to experiment awhile to get everything to compile. If you are * creating or using a shared library, you probably shouldn't touch this, * as it will affect the size of the structures, and this will cause bad * things to happen if the library and/or application ever change. */ /* Any transformations you will not be using can be undef'ed here */ /* GR-P, 0.96a: Set "*TRANSFORMS_SUPPORTED as default but allow user to turn it off with "*TRANSFORMS_NOT_SUPPORTED" on the compile line, then pick and choose which ones to define without having to edit this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED if you only want to have a png-compliant reader/writer but don't need any of the extra transformations. This saves about 80 kbytes in a typical installation of the library. */ #ifndef PNG_READ_TRANSFORMS_NOT_SUPPORTED #define PNG_READ_TRANSFORMS_SUPPORTED #endif #ifndef PNG_WRITE_TRANSFORMS_NOT_SUPPORTED #define PNG_WRITE_TRANSFORMS_SUPPORTED #endif #ifdef PNG_READ_TRANSFORMS_SUPPORTED #define PNG_READ_EXPAND_SUPPORTED #define PNG_READ_SHIFT_SUPPORTED #define PNG_READ_PACK_SUPPORTED #define PNG_READ_BGR_SUPPORTED #define PNG_READ_SWAP_SUPPORTED #define PNG_READ_PACKSWAP_SUPPORTED #define PNG_READ_INVERT_SUPPORTED #define PNG_READ_DITHER_SUPPORTED #define PNG_READ_BACKGROUND_SUPPORTED #define PNG_READ_16_TO_8_SUPPORTED #define PNG_READ_FILLER_SUPPORTED #define PNG_READ_GAMMA_SUPPORTED #define PNG_READ_GRAY_TO_RGB_SUPPORTED #define PNG_READ_SWAP_ALPHA_SUPPORTED #define PNG_READ_INVERT_ALPHA_SUPPORTED #define PNG_READ_STRIP_ALPHA_SUPPORTED #define PNG_READ_USER_TRANSFORM_SUPPORTED /* the following aren't implemented yet #define PNG_READ_RGB_TO_GRAY_SUPPORTED */ #endif /* PNG_READ_TRANSFORMS_SUPPORTED */ #ifndef PNG_PROGRESSIVE_READ_NOT_SUPPORTED /* if you don't do progressive */ #define PNG_PROGRESSIVE_READ_SUPPORTED /* reading. This is not talking */ #endif /* about interlacing capability! You'll */ /* still have interlacing unless you change the following line: */ #define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */ #define PNG_READ_COMPOSITE_NODIV_SUPPORTED /* well tested on Intel and SGI */ #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED #define PNG_WRITE_SHIFT_SUPPORTED #define PNG_WRITE_PACK_SUPPORTED #define PNG_WRITE_BGR_SUPPORTED #define PNG_WRITE_SWAP_SUPPORTED #define PNG_WRITE_PACKSWAP_SUPPORTED #define PNG_WRITE_INVERT_SUPPORTED #define PNG_WRITE_FILLER_SUPPORTED /* This is the same as WRITE_STRIP_ALPHA */ #define PNG_WRITE_FLUSH_SUPPORTED #define PNG_WRITE_SWAP_ALPHA_SUPPORTED #define PNG_WRITE_INVERT_ALPHA_SUPPORTED #define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED #define PNG_WRITE_USER_TRANSFORM_SUPPORTED #endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */ #define PNG_WRITE_INTERLACING_SUPPORTED /* not required for PNG-compliant encoders, but can cause trouble if left undefined */ #if !defined(PNG_NO_STDIO) #define PNG_TIME_RFC1123_SUPPORTED #endif /* This adds extra functions in pngget.c for accessing data from the * info pointer (added in version 0.99) * png_get_image_width() * png_get_image_height() * png_get_bit_depth() * png_get_color_type() * png_get_compression_type() * png_get_filter_type() * png_get_interlace_type() * png_get_pixel_aspect_ratio() * png_get_pixels_per_meter() * png_get_x_offset_pixels() * png_get_y_offset_pixels() * png_get_x_offset_microns() * png_get_y_offset_microns() */ #if !defined(PNG_NO_EASY_ACCESS) #define PNG_EASY_ACCESS_SUPPORTED #endif /* These are currently experimental features, define them if you want */ /* very little testing */ /* #define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED */ /* This is only for PowerPC big-endian and 680x0 systems */ /* some testing */ /* #define PNG_READ_BIG_ENDIAN_SUPPORTED */ /* These functions are turned off by default, as they will be phased out. */ /* #define PNG_USELESS_TESTS_SUPPORTED #define PNG_CORRECT_PALETTE_SUPPORTED */ /* Any chunks you are not interested in, you can undef here. The * ones that allocate memory may be expecially important (hIST, * tEXt, zTXt, tRNS, pCAL). Others will just save time and make png_info * a bit smaller. */ #ifndef PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED #define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED #endif #ifndef PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED #define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED #endif #ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED #define PNG_READ_bKGD_SUPPORTED #define PNG_READ_cHRM_SUPPORTED #define PNG_READ_gAMA_SUPPORTED #define PNG_READ_hIST_SUPPORTED #define PNG_READ_oFFs_SUPPORTED #define PNG_READ_pCAL_SUPPORTED #define PNG_READ_pHYs_SUPPORTED #define PNG_READ_sBIT_SUPPORTED #define PNG_READ_sRGB_SUPPORTED #define PNG_READ_tEXt_SUPPORTED #define PNG_READ_tIME_SUPPORTED #define PNG_READ_tRNS_SUPPORTED #define PNG_READ_zTXt_SUPPORTED #define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the optional */ /* PLTE chunk in RGB and RGBA images */ #endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */ #ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED #define PNG_WRITE_bKGD_SUPPORTED #define PNG_WRITE_cHRM_SUPPORTED #define PNG_WRITE_gAMA_SUPPORTED #define PNG_WRITE_hIST_SUPPORTED #define PNG_WRITE_oFFs_SUPPORTED #define PNG_WRITE_pCAL_SUPPORTED #define PNG_WRITE_pHYs_SUPPORTED #define PNG_WRITE_sBIT_SUPPORTED #define PNG_WRITE_sRGB_SUPPORTED #define PNG_WRITE_tEXt_SUPPORTED #define PNG_WRITE_tIME_SUPPORTED #define PNG_WRITE_tRNS_SUPPORTED #define PNG_WRITE_zTXt_SUPPORTED #endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */ /* need the time information for reading tIME chunks */ #if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED) #include #endif /* Some typedefs to get us started. These should be safe on most of the * common platforms. The typedefs should be at least as large as the * numbers suggest (a png_uint_32 must be at least 32 bits long), but they * don't have to be exactly that size. Some compilers dislike passing * unsigned shorts as function parameters, so you may be better off using * unsigned int for png_uint_16. Likewise, for 64-bit systems, you may * want to have unsigned int for png_uint_32 instead of unsigned long. */ typedef unsigned long png_uint_32; typedef long png_int_32; typedef unsigned short png_uint_16; typedef short png_int_16; typedef unsigned char png_byte; /* This is usually size_t. It is typedef'ed just in case you need it to change (I'm not sure if you will or not, so I thought I'd be safe) */ typedef size_t png_size_t; /* The following is needed for medium model support. It cannot be in the * PNG_INTERNAL section. Needs modification for other compilers besides * MSC. Model independent support declares all arrays and pointers to be * large using the far keyword. The zlib version used must also support * model independent data. As of version zlib 1.0.4, the necessary changes * have been made in zlib. The USE_FAR_KEYWORD define triggers other * changes that are needed. (Tim Wegner) */ /* Separate compiler dependencies (problem here is that zlib.h always defines FAR. (SJT) */ #ifdef __BORLANDC__ #if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__) #define LDATA 1 #else #define LDATA 0 #endif #if !defined(__WIN32__) && !defined(__FLAT__) #define PNG_MAX_MALLOC_64K #if (LDATA != 1) #ifndef FAR #define FAR __far #endif #define USE_FAR_KEYWORD #endif /* LDATA != 1 */ /* Possibly useful for moving data out of default segment. * Uncomment it if you want. Could also define FARDATA as * const if your compiler supports it. (SJT) # define FARDATA FAR */ #endif /* __WIN32__, __FLAT__ */ #endif /* __BORLANDC__ */ /* Suggest testing for specific compiler first before testing for * FAR. The Watcom compiler defines both __MEDIUM__ and M_I86MM, * making reliance oncertain keywords suspect. (SJT) */ /* MSC Medium model */ #if defined(FAR) # if defined(M_I86MM) # define USE_FAR_KEYWORD # define FARDATA FAR # include # endif #endif /* SJT: default case */ #ifndef FAR # define FAR #endif /* At this point FAR is always defined */ #ifndef FARDATA #define FARDATA #endif /* Add typedefs for pointers */ typedef void FAR * png_voidp; typedef png_byte FAR * png_bytep; typedef png_uint_32 FAR * png_uint_32p; typedef png_int_32 FAR * png_int_32p; typedef png_uint_16 FAR * png_uint_16p; typedef png_int_16 FAR * png_int_16p; typedef PNG_CONST char FAR * png_const_charp; typedef char FAR * png_charp; typedef double FAR * png_doublep; /* Pointers to pointers; i.e. arrays */ typedef png_byte FAR * FAR * png_bytepp; typedef png_uint_32 FAR * FAR * png_uint_32pp; typedef png_int_32 FAR * FAR * png_int_32pp; typedef png_uint_16 FAR * FAR * png_uint_16pp; typedef png_int_16 FAR * FAR * png_int_16pp; typedef PNG_CONST char FAR * FAR * png_const_charpp; typedef char FAR * FAR * png_charpp; typedef double FAR * FAR * png_doublepp; /* Pointers to pointers to pointers; i.e. pointer to array */ typedef char FAR * FAR * FAR * png_charppp; /* libpng typedefs for types in zlib. If zlib changes * or another compression library is used, then change these. * Eliminates need to change all the source files. */ typedef charf * png_zcharp; typedef charf * FAR * png_zcharpp; typedef z_stream FAR * png_zstreamp; /* allow for compilation as dll under MS Windows */ #ifdef __WIN32DLL__ #define PNG_EXPORT(type,symbol) __declspec(dllexport) type symbol #endif /* allow for compilation as dll with BORLAND C++ 5.0 */ #if defined(__BORLANDC__) && defined(_Windows) && defined(__DLL__) # define PNG_EXPORT(type,symbol) type _export symbol #endif /* allow for compilation as shared lib under BeOS */ #ifdef __BEOSDLL__ #define PNG_EXPORT(type,symbol) __declspec(export) type symbol #endif #ifndef PNG_EXPORT #define PNG_EXPORT(type,symbol) type symbol #endif /* User may want to use these so not in PNG_INTERNAL. Any library functions * that are passed far data must be model independent. */ #if defined(USE_FAR_KEYWORD) /* memory model independent fns */ /* use this to make far-to-near assignments */ # define CHECK 1 # define NOCHECK 0 # define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK)) # define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK)) # define png_strlen _fstrlen # define png_memcmp _fmemcmp /* SJT: added */ # define png_memcpy _fmemcpy # define png_memset _fmemset #else /* use the usual functions */ # define CVT_PTR(ptr) (ptr) # define CVT_PTR_NOCHECK(ptr) (ptr) # define png_strlen strlen # define png_memcmp memcmp /* SJT: added */ # define png_memcpy memcpy # define png_memset memset #endif /* End of memory model independent support */ /* Just a 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 */