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pngconf.h
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/* pngconf.h - machine configurable file for libpng * * libpng version 1.5.26, December 17, 2015 * * Copyright (c) 1998-2002,2004,2006-2013 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * * This code is released under the libpng license. * For conditions of distribution and use, see the disclaimer * and license in png.h * * 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 #ifndef PNG_BUILDING_SYMBOL_TABLE /* PNG_NO_LIMITS_H may be used to turn off the use of the standard C * definition file for machine specific limits, this may impact the * correctness of the definitions below (see uses of INT_MAX). */ # ifndef PNG_NO_LIMITS_H # include <limits.h> # endif /* For the memory copy APIs (i.e. the standard definitions of these), * because this file defines png_memcpy and so on the base APIs must * be defined here. */ # ifdef BSD # include <strings.h> # else # include <string.h> # endif /* For png_FILE_p - this provides the standard definition of a * FILE */ # ifdef PNG_STDIO_SUPPORTED # include <stdio.h> # endif #endif /* This controls optimization of the reading of 16 and 32 bit values * from PNG files. It can be set on a per-app-file basis - it * just changes whether a macro is used when the function is called. * The library builder sets the default; if read functions are not * built into the library the macro implementation is forced on. */ #ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED # define PNG_USE_READ_MACROS #endif #if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS) # if PNG_DEFAULT_READ_MACROS # define PNG_USE_READ_MACROS # endif #endif /* COMPILER SPECIFIC OPTIONS. * * These options are provided so that a variety of difficult compilers * can be used. Some are fixed at build time (e.g. PNG_API_RULE * below) but still have compiler specific implementations, others * may be changed on a per-file basis when compiling against libpng. */ /* The PNGARG 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 */ /* Function calling conventions. * ============================= * Normally it is not necessary to specify to the compiler how to call * a function - it just does it - however on x86 systems derived from * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems * and some others) there are multiple ways to call a function and the * default can be changed on the compiler command line. For this reason * libpng specifies the calling convention of every exported function and * every function called via a user supplied function pointer. This is * done in this file by defining the following macros: * * PNGAPI Calling convention for exported functions. * PNGCBAPI Calling convention for user provided (callback) functions. * PNGCAPI Calling convention used by the ANSI-C library (required * for longjmp callbacks and sometimes used internally to * specify the calling convention for zlib). * * These macros should never be overridden. If it is necessary to * change calling convention in a private build this can be done * by setting PNG_API_RULE (which defaults to 0) to one of the values * below to select the correct 'API' variants. * * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout. * This is correct in every known environment. * PNG_API_RULE=1 Use the operating system convention for PNGAPI and * the 'C' calling convention (from PNGCAPI) for * callbacks (PNGCBAPI). This is no longer required * in any known environment - if it has to be used * please post an explanation of the problem to the * libpng mailing list. * * These cases only differ if the operating system does not use the C * calling convention, at present this just means the above cases * (x86 DOS/Windows sytems) and, even then, this does not apply to * Cygwin running on those systems. * * Note that the value must be defined in pnglibconf.h so that what * the application uses to call the library matches the conventions * set when building the library. */ /* Symbol export * ============= * When building a shared library it is almost always necessary to tell * the compiler which symbols to export. The png.h macro 'PNG_EXPORT' * is used to mark the symbols. On some systems these symbols can be * extracted at link time and need no special processing by the compiler, * on other systems the symbols are flagged by the compiler and just * the declaration requires a special tag applied (unfortunately) in a * compiler dependent way. Some systems can do either. * * A small number of older systems also require a symbol from a DLL to * be flagged to the program that calls it. This is a problem because * we do not know in the header file included by application code that * the symbol will come from a shared library, as opposed to a statically * linked one. For this reason the application must tell us by setting * the magic flag PNG_USE_DLL to turn on the special processing before * it includes png.h. * * Four additional macros are used to make this happen: * * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from * the build or imported if PNG_USE_DLL is set - compiler * and system specific. * * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to * 'type', compiler specific. * * PNG_DLL_EXPORT Set to the magic to use during a libpng build to * make a symbol exported from the DLL. Not used in the * public header files; see pngpriv.h for how it is used * in the libpng build. * * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come * from a DLL - used to define PNG_IMPEXP when * PNG_USE_DLL is set. */ /* System specific discovery. * ========================== * This code is used at build time to find PNG_IMPEXP, the API settings * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL * import processing is possible. On Windows systems it also sets * compiler-specific macros to the values required to change the calling * conventions of the various functions. */ #if defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\ defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) /* Windows system (DOS doesn't support DLLs). Includes builds under Cygwin or * MinGW on any architecture currently supported by Windows. Also includes * Watcom builds but these need special treatment because they are not * compatible with GCC or Visual C because of different calling conventions. */ # if PNG_API_RULE == 2 /* If this line results in an error, either because __watcall is not * understood or because of a redefine just below you cannot use *this* * build of the library with the compiler you are using. *This* build was * build using Watcom and applications must also be built using Watcom! */ # define PNGCAPI __watcall # endif # if defined(__GNUC__) || (defined(_MSC_VER) && (_MSC_VER >= 800)) # define PNGCAPI __cdecl # if PNG_API_RULE == 1 /* If this line results in an error __stdcall is not understood and * PNG_API_RULE should not have been set to '1'. */ # define PNGAPI __stdcall # endif # else /* An older compiler, or one not detected (erroneously) above, * if necessary override on the command line to get the correct * variants for the compiler. */ # ifndef PNGCAPI # define PNGCAPI _cdecl # endif # if PNG_API_RULE == 1 && !defined(PNGAPI) # define PNGAPI _stdcall # endif # endif /* compiler/api */ /* NOTE: PNGCBAPI always defaults to PNGCAPI. */ # if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD) ERROR: PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed # endif # if (defined(_MSC_VER) && _MSC_VER < 800) ||\ (defined(__BORLANDC__) && __BORLANDC__ < 0x500) /* older Borland and MSC * compilers used '__export' and required this to be after * the type. */ # ifndef PNG_EXPORT_TYPE # define PNG_EXPORT_TYPE(type) type PNG_IMPEXP # endif # define PNG_DLL_EXPORT __export # else /* newer compiler */ # define PNG_DLL_EXPORT __declspec(dllexport) # ifndef PNG_DLL_IMPORT # define PNG_DLL_IMPORT __declspec(dllimport) # endif # endif /* compiler */ #else /* !Windows */ # if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__) # define PNGAPI _System # else /* !Windows/x86 && !OS/2 */ /* Use the defaults, or define PNG*API on the command line (but * this will have to be done for every compile!) */ # endif /* other system, !OS/2 */ #endif /* !Windows/x86 */ /* Now do all the defaulting . */ #ifndef PNGCAPI # define PNGCAPI #endif #ifndef PNGCBAPI # define PNGCBAPI PNGCAPI #endif #ifndef PNGAPI # define PNGAPI PNGCAPI #endif /* PNG_IMPEXP may be set on the compilation system command line or (if not set) * then in an internal header file when building the library, otherwise (when * using the library) it is set here. */ #ifndef PNG_IMPEXP # if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT) /* This forces use of a DLL, disallowing static linking */ # define PNG_IMPEXP PNG_DLL_IMPORT # endif # ifndef PNG_IMPEXP # define PNG_IMPEXP # endif #endif /* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat * 'attributes' as a storage class - the attributes go at the start of the * function definition, and attributes are always appended regardless of the * compiler. This considerably simplifies these macros but may cause problems * if any compilers both need function attributes and fail to handle them as * a storage class (this is unlikely.) */ #ifndef PNG_FUNCTION # define PNG_FUNCTION(type, name, args, attributes) attributes type name args #endif #ifndef PNG_EXPORT_TYPE # define PNG_EXPORT_TYPE(type) PNG_IMPEXP type #endif /* The ordinal value is only relevant when preprocessing png.h for symbol * table entries, so we discard it here. See the .dfn files in the * scripts directory. */ #ifndef PNG_EXPORTA # define PNG_EXPORTA(ordinal, type, name, args, attributes)\ PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args), \ extern attributes) #endif /* ANSI-C (C90) does not permit a macro to be invoked with an empty argument, * so make something non-empty to satisfy the requirement: */ #define PNG_EMPTY /*empty list*/ #define PNG_EXPORT(ordinal, type, name, args)\ PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY) /* Use PNG_REMOVED to comment out a removed interface. */ #ifndef PNG_REMOVED # define PNG_REMOVED(ordinal, type, name, args, attributes) #endif #ifndef PNG_CALLBACK # define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args) #endif /* Support for compiler specific function attributes. These are used * so that where compiler support is available incorrect use of API * functions in png.h will generate compiler warnings. * * Added at libpng-1.2.41. */ #ifndef PNG_NO_PEDANTIC_WARNINGS # ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED # define PNG_PEDANTIC_WARNINGS_SUPPORTED # endif #endif #ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED /* Support for compiler specific function attributes. These are used * so that where compiler support is available incorrect use of API * functions in png.h will generate compiler warnings. Added at libpng * version 1.2.41. */ # if defined(__GNUC__) # ifndef PNG_USE_RESULT # define PNG_USE_RESULT __attribute__((__warn_unused_result__)) # endif # ifndef PNG_NORETURN # define PNG_NORETURN __attribute__((__noreturn__)) # endif # if __GNUC__ >= 3 # ifndef PNG_ALLOCATED # define PNG_ALLOCATED __attribute__((__malloc__)) # endif # ifndef PNG_DEPRECATED # define PNG_DEPRECATED __attribute__((__deprecated__)) # endif # ifndef PNG_PRIVATE # if 0 /* Doesn't work so we use deprecated instead*/ # define PNG_PRIVATE \ __attribute__((warning("This function is not exported by libpng."))) # else # define PNG_PRIVATE \ __attribute__((__deprecated__)) # endif # endif # endif /* __GNUC__ >= 3 */ # endif /* __GNUC__ */ # if defined(_MSC_VER) && (_MSC_VER >= 1300) # ifndef PNG_USE_RESULT # define PNG_USE_RESULT /* not supported */ # endif # ifndef PNG_NORETURN # define PNG_NORETURN __declspec(noreturn) # endif # ifndef PNG_ALLOCATED # if (_MSC_VER >= 1400) # define PNG_ALLOCATED __declspec(restrict) # endif # endif # ifndef PNG_DEPRECATED # define PNG_DEPRECATED __declspec(deprecated) # endif # ifndef PNG_PRIVATE # define PNG_PRIVATE __declspec(deprecated) # endif # endif /* _MSC_VER */ #endif /* PNG_PEDANTIC_WARNINGS */ #ifndef PNG_DEPRECATED # define PNG_DEPRECATED /* Use of this function is deprecated */ #endif #ifndef PNG_USE_RESULT # define PNG_USE_RESULT /* The result of this function must be checked */ #endif #ifndef PNG_NORETURN # define PNG_NORETURN /* This function does not return */ #endif #ifndef PNG_ALLOCATED # define PNG_ALLOCATED /* The result of the function is new memory */ #endif #ifndef PNG_PRIVATE # define PNG_PRIVATE /* This is a private libpng function */ #endif #ifndef PNG_FP_EXPORT /* A floating point API. */ # ifdef PNG_FLOATING_POINT_SUPPORTED # define PNG_FP_EXPORT(ordinal, type, name, args)\ PNG_EXPORT(ordinal, type, name, args); # else /* No floating point APIs */ # define PNG_FP_EXPORT(ordinal, type, name, args) # endif #endif #ifndef PNG_FIXED_EXPORT /* A fixed point API. */ # ifdef PNG_FIXED_POINT_SUPPORTED # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ PNG_EXPORT(ordinal, type, name, args); # else /* No fixed point APIs */ # define PNG_FIXED_EXPORT(ordinal, type, name, args) # endif #endif /* 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. * * This should not change how the APIs are called, so it can be done * on a per-file basis in the application. */ #ifndef PNG_CONST # ifndef PNG_NO_CONST # define PNG_CONST const # else # define PNG_CONST # endif #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. */ #if defined(INT_MAX) && (INT_MAX > 0x7ffffffeL) typedef unsigned int png_uint_32; typedef int png_int_32; #else typedef unsigned long png_uint_32; typedef long png_int_32; #endif typedef unsigned short png_uint_16; typedef short png_int_16; typedef unsigned char png_byte; #ifdef PNG_NO_SIZE_T typedef unsigned int png_size_t; #else typedef size_t png_size_t; #endif #define png_sizeof(x) (sizeof (x)) /* The following is needed for medium model support. It cannot be in the * pngpriv.h header. 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 /* GRR: why is Cygwin in here? Cygwin is not Borland C... */ # if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__) # define PNG_MAX_MALLOC_64K /* only used in build */ # 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__, __CYGWIN__ */ #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 */ #ifdef FAR # ifdef M_I86MM # define USE_FAR_KEYWORD # define FARDATA FAR # include <dos.h> # endif #endif /* SJT: default case */ #ifndef FAR # define FAR #endif /* At this point FAR is always defined */ #ifndef FARDATA # define FARDATA #endif /* Typedef for floating-point numbers that are converted * to fixed-point with a multiple of 100,000, e.g., gamma */ typedef png_int_32 png_fixed_point; /* Add typedefs for pointers */ typedef void FAR * png_voidp; typedef PNG_CONST void FAR * png_const_voidp; typedef png_byte FAR * png_bytep; typedef PNG_CONST png_byte FAR * png_const_bytep; typedef png_uint_32 FAR * png_uint_32p; typedef PNG_CONST png_uint_32 FAR * png_const_uint_32p; typedef png_int_32 FAR * png_int_32p; typedef PNG_CONST png_int_32 FAR * png_const_int_32p; typedef png_uint_16 FAR * png_uint_16p; typedef PNG_CONST png_uint_16 FAR * png_const_uint_16p; typedef png_int_16 FAR * png_int_16p; typedef PNG_CONST png_int_16 FAR * png_const_int_16p; typedef char FAR * png_charp; typedef PNG_CONST char FAR * png_const_charp; typedef png_fixed_point FAR * png_fixed_point_p; typedef PNG_CONST png_fixed_point FAR * png_const_fixed_point_p; typedef png_size_t FAR * png_size_tp; typedef PNG_CONST png_size_t FAR * png_const_size_tp; #ifdef PNG_STDIO_SUPPORTED typedef FILE * png_FILE_p; #endif #ifdef PNG_FLOATING_POINT_SUPPORTED typedef double FAR * png_doublep; typedef PNG_CONST double FAR * png_const_doublep; #endif /* 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 png_fixed_point FAR * FAR * png_fixed_point_pp; #ifdef PNG_FLOATING_POINT_SUPPORTED typedef double FAR * FAR * png_doublepp; #endif /* Pointers to pointers to pointers; i.e., pointer to array */ typedef char FAR * FAR * FAR * png_charppp; /* png_alloc_size_t is guaranteed to be no smaller than png_size_t, * and no smaller than png_uint_32. Casts from png_size_t or png_uint_32 * to png_alloc_size_t are not necessary; in fact, it is recommended * not to use them at all so that the compiler can complain when something * turns out to be problematic. * Casts in the other direction (from png_alloc_size_t to png_size_t or * png_uint_32) should be explicitly applied; however, we do not expect * to encounter practical situations that require such conversions. */ #if defined(__TURBOC__) && !defined(__FLAT__) typedef unsigned long png_alloc_size_t; #else # if defined(_MSC_VER) && defined(MAXSEG_64K) typedef unsigned long png_alloc_size_t; # else /* This is an attempt to detect an old Windows system where (int) is * actually 16 bits, in that case png_malloc must have an argument with a * bigger size to accomodate the requirements of the library. */ # if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) && \ (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL) typedef DWORD png_alloc_size_t; # else typedef png_size_t png_alloc_size_t; # endif # endif #endif #endif /* PNGCONF_H */