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0001 0002 /* pngconf.h - machine-configurable file for libpng 0003 * 0004 * libpng version 1.6.39 0005 * 0006 * Copyright (c) 2018-2022 Cosmin Truta 0007 * Copyright (c) 1998-2002,2004,2006-2016,2018 Glenn Randers-Pehrson 0008 * Copyright (c) 1996-1997 Andreas Dilger 0009 * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc. 0010 * 0011 * This code is released under the libpng license. 0012 * For conditions of distribution and use, see the disclaimer 0013 * and license in png.h 0014 * 0015 * Any machine specific code is near the front of this file, so if you 0016 * are configuring libpng for a machine, you may want to read the section 0017 * starting here down to where it starts to typedef png_color, png_text, 0018 * and png_info. 0019 */ 0020 0021 #ifndef PNGCONF_H 0022 #define PNGCONF_H 0023 0024 #ifndef PNG_BUILDING_SYMBOL_TABLE /* else includes may cause problems */ 0025 0026 /* From libpng 1.6.0 libpng requires an ANSI X3.159-1989 ("ISOC90") compliant C 0027 * compiler for correct compilation. The following header files are required by 0028 * the standard. If your compiler doesn't provide these header files, or they 0029 * do not match the standard, you will need to provide/improve them. 0030 */ 0031 #include <limits.h> 0032 #include <stddef.h> 0033 0034 /* Library header files. These header files are all defined by ISOC90; libpng 0035 * expects conformant implementations, however, an ISOC90 conformant system need 0036 * not provide these header files if the functionality cannot be implemented. 0037 * In this case it will be necessary to disable the relevant parts of libpng in 0038 * the build of pnglibconf.h. 0039 * 0040 * Prior to 1.6.0 string.h was included here; the API changes in 1.6.0 to not 0041 * include this unnecessary header file. 0042 */ 0043 0044 #ifdef PNG_STDIO_SUPPORTED 0045 /* Required for the definition of FILE: */ 0046 # include <stdio.h> 0047 #endif 0048 0049 #ifdef PNG_SETJMP_SUPPORTED 0050 /* Required for the definition of jmp_buf and the declaration of longjmp: */ 0051 # include <setjmp.h> 0052 #endif 0053 0054 #ifdef PNG_CONVERT_tIME_SUPPORTED 0055 /* Required for struct tm: */ 0056 # include <time.h> 0057 #endif 0058 0059 #endif /* PNG_BUILDING_SYMBOL_TABLE */ 0060 0061 /* Prior to 1.6.0, it was possible to turn off 'const' in declarations, 0062 * using PNG_NO_CONST. This is no longer supported. 0063 */ 0064 #define PNG_CONST const /* backward compatibility only */ 0065 0066 /* This controls optimization of the reading of 16-bit and 32-bit 0067 * values from PNG files. It can be set on a per-app-file basis: it 0068 * just changes whether a macro is used when the function is called. 0069 * The library builder sets the default; if read functions are not 0070 * built into the library the macro implementation is forced on. 0071 */ 0072 #ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED 0073 # define PNG_USE_READ_MACROS 0074 #endif 0075 #if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS) 0076 # if PNG_DEFAULT_READ_MACROS 0077 # define PNG_USE_READ_MACROS 0078 # endif 0079 #endif 0080 0081 /* COMPILER SPECIFIC OPTIONS. 0082 * 0083 * These options are provided so that a variety of difficult compilers 0084 * can be used. Some are fixed at build time (e.g. PNG_API_RULE 0085 * below) but still have compiler specific implementations, others 0086 * may be changed on a per-file basis when compiling against libpng. 0087 */ 0088 0089 /* The PNGARG macro was used in versions of libpng prior to 1.6.0 to protect 0090 * against legacy (pre ISOC90) compilers that did not understand function 0091 * prototypes. It is not required for modern C compilers. 0092 */ 0093 #ifndef PNGARG 0094 # define PNGARG(arglist) arglist 0095 #endif 0096 0097 /* Function calling conventions. 0098 * ============================= 0099 * Normally it is not necessary to specify to the compiler how to call 0100 * a function - it just does it - however on x86 systems derived from 0101 * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems 0102 * and some others) there are multiple ways to call a function and the 0103 * default can be changed on the compiler command line. For this reason 0104 * libpng specifies the calling convention of every exported function and 0105 * every function called via a user supplied function pointer. This is 0106 * done in this file by defining the following macros: 0107 * 0108 * PNGAPI Calling convention for exported functions. 0109 * PNGCBAPI Calling convention for user provided (callback) functions. 0110 * PNGCAPI Calling convention used by the ANSI-C library (required 0111 * for longjmp callbacks and sometimes used internally to 0112 * specify the calling convention for zlib). 0113 * 0114 * These macros should never be overridden. If it is necessary to 0115 * change calling convention in a private build this can be done 0116 * by setting PNG_API_RULE (which defaults to 0) to one of the values 0117 * below to select the correct 'API' variants. 0118 * 0119 * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout. 0120 * This is correct in every known environment. 0121 * PNG_API_RULE=1 Use the operating system convention for PNGAPI and 0122 * the 'C' calling convention (from PNGCAPI) for 0123 * callbacks (PNGCBAPI). This is no longer required 0124 * in any known environment - if it has to be used 0125 * please post an explanation of the problem to the 0126 * libpng mailing list. 0127 * 0128 * These cases only differ if the operating system does not use the C 0129 * calling convention, at present this just means the above cases 0130 * (x86 DOS/Windows systems) and, even then, this does not apply to 0131 * Cygwin running on those systems. 0132 * 0133 * Note that the value must be defined in pnglibconf.h so that what 0134 * the application uses to call the library matches the conventions 0135 * set when building the library. 0136 */ 0137 0138 /* Symbol export 0139 * ============= 0140 * When building a shared library it is almost always necessary to tell 0141 * the compiler which symbols to export. The png.h macro 'PNG_EXPORT' 0142 * is used to mark the symbols. On some systems these symbols can be 0143 * extracted at link time and need no special processing by the compiler, 0144 * on other systems the symbols are flagged by the compiler and just 0145 * the declaration requires a special tag applied (unfortunately) in a 0146 * compiler dependent way. Some systems can do either. 0147 * 0148 * A small number of older systems also require a symbol from a DLL to 0149 * be flagged to the program that calls it. This is a problem because 0150 * we do not know in the header file included by application code that 0151 * the symbol will come from a shared library, as opposed to a statically 0152 * linked one. For this reason the application must tell us by setting 0153 * the magic flag PNG_USE_DLL to turn on the special processing before 0154 * it includes png.h. 0155 * 0156 * Four additional macros are used to make this happen: 0157 * 0158 * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from 0159 * the build or imported if PNG_USE_DLL is set - compiler 0160 * and system specific. 0161 * 0162 * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to 0163 * 'type', compiler specific. 0164 * 0165 * PNG_DLL_EXPORT Set to the magic to use during a libpng build to 0166 * make a symbol exported from the DLL. Not used in the 0167 * public header files; see pngpriv.h for how it is used 0168 * in the libpng build. 0169 * 0170 * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come 0171 * from a DLL - used to define PNG_IMPEXP when 0172 * PNG_USE_DLL is set. 0173 */ 0174 0175 /* System specific discovery. 0176 * ========================== 0177 * This code is used at build time to find PNG_IMPEXP, the API settings 0178 * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL 0179 * import processing is possible. On Windows systems it also sets 0180 * compiler-specific macros to the values required to change the calling 0181 * conventions of the various functions. 0182 */ 0183 #if defined(_WIN32) || defined(__WIN32__) || defined(__NT__) || \ 0184 defined(__CYGWIN__) 0185 /* Windows system (DOS doesn't support DLLs). Includes builds under Cygwin or 0186 * MinGW on any architecture currently supported by Windows. Also includes 0187 * Watcom builds but these need special treatment because they are not 0188 * compatible with GCC or Visual C because of different calling conventions. 0189 */ 0190 # if PNG_API_RULE == 2 0191 /* If this line results in an error, either because __watcall is not 0192 * understood or because of a redefine just below you cannot use *this* 0193 * build of the library with the compiler you are using. *This* build was 0194 * build using Watcom and applications must also be built using Watcom! 0195 */ 0196 # define PNGCAPI __watcall 0197 # endif 0198 0199 # if defined(__GNUC__) || (defined(_MSC_VER) && (_MSC_VER >= 800)) 0200 # define PNGCAPI __cdecl 0201 # if PNG_API_RULE == 1 0202 /* If this line results in an error __stdcall is not understood and 0203 * PNG_API_RULE should not have been set to '1'. 0204 */ 0205 # define PNGAPI __stdcall 0206 # endif 0207 # else 0208 /* An older compiler, or one not detected (erroneously) above, 0209 * if necessary override on the command line to get the correct 0210 * variants for the compiler. 0211 */ 0212 # ifndef PNGCAPI 0213 # define PNGCAPI _cdecl 0214 # endif 0215 # if PNG_API_RULE == 1 && !defined(PNGAPI) 0216 # define PNGAPI _stdcall 0217 # endif 0218 # endif /* compiler/api */ 0219 0220 /* NOTE: PNGCBAPI always defaults to PNGCAPI. */ 0221 0222 # if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD) 0223 # error "PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed" 0224 # endif 0225 0226 # if (defined(_MSC_VER) && _MSC_VER < 800) ||\ 0227 (defined(__BORLANDC__) && __BORLANDC__ < 0x500) 0228 /* older Borland and MSC 0229 * compilers used '__export' and required this to be after 0230 * the type. 0231 */ 0232 # ifndef PNG_EXPORT_TYPE 0233 # define PNG_EXPORT_TYPE(type) type PNG_IMPEXP 0234 # endif 0235 # define PNG_DLL_EXPORT __export 0236 # else /* newer compiler */ 0237 # define PNG_DLL_EXPORT __declspec(dllexport) 0238 # ifndef PNG_DLL_IMPORT 0239 # define PNG_DLL_IMPORT __declspec(dllimport) 0240 # endif 0241 # endif /* compiler */ 0242 0243 #else /* !Windows */ 0244 # if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__) 0245 # define PNGAPI _System 0246 # else /* !Windows/x86 && !OS/2 */ 0247 /* Use the defaults, or define PNG*API on the command line (but 0248 * this will have to be done for every compile!) 0249 */ 0250 # endif /* other system, !OS/2 */ 0251 #endif /* !Windows/x86 */ 0252 0253 /* Now do all the defaulting . */ 0254 #ifndef PNGCAPI 0255 # define PNGCAPI 0256 #endif 0257 #ifndef PNGCBAPI 0258 # define PNGCBAPI PNGCAPI 0259 #endif 0260 #ifndef PNGAPI 0261 # define PNGAPI PNGCAPI 0262 #endif 0263 0264 /* PNG_IMPEXP may be set on the compilation system command line or (if not set) 0265 * then in an internal header file when building the library, otherwise (when 0266 * using the library) it is set here. 0267 */ 0268 #ifndef PNG_IMPEXP 0269 # if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT) 0270 /* This forces use of a DLL, disallowing static linking */ 0271 # define PNG_IMPEXP PNG_DLL_IMPORT 0272 # endif 0273 0274 # ifndef PNG_IMPEXP 0275 # define PNG_IMPEXP 0276 # endif 0277 #endif 0278 0279 /* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat 0280 * 'attributes' as a storage class - the attributes go at the start of the 0281 * function definition, and attributes are always appended regardless of the 0282 * compiler. This considerably simplifies these macros but may cause problems 0283 * if any compilers both need function attributes and fail to handle them as 0284 * a storage class (this is unlikely.) 0285 */ 0286 #ifndef PNG_FUNCTION 0287 # define PNG_FUNCTION(type, name, args, attributes) attributes type name args 0288 #endif 0289 0290 #ifndef PNG_EXPORT_TYPE 0291 # define PNG_EXPORT_TYPE(type) PNG_IMPEXP type 0292 #endif 0293 0294 /* The ordinal value is only relevant when preprocessing png.h for symbol 0295 * table entries, so we discard it here. See the .dfn files in the 0296 * scripts directory. 0297 */ 0298 0299 #ifndef PNG_EXPORTA 0300 # define PNG_EXPORTA(ordinal, type, name, args, attributes) \ 0301 PNG_FUNCTION(PNG_EXPORT_TYPE(type), (PNGAPI name), PNGARG(args), \ 0302 PNG_LINKAGE_API attributes) 0303 #endif 0304 0305 /* ANSI-C (C90) does not permit a macro to be invoked with an empty argument, 0306 * so make something non-empty to satisfy the requirement: 0307 */ 0308 #define PNG_EMPTY /*empty list*/ 0309 0310 #define PNG_EXPORT(ordinal, type, name, args) \ 0311 PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY) 0312 0313 /* Use PNG_REMOVED to comment out a removed interface. */ 0314 #ifndef PNG_REMOVED 0315 # define PNG_REMOVED(ordinal, type, name, args, attributes) 0316 #endif 0317 0318 #ifndef PNG_CALLBACK 0319 # define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args) 0320 #endif 0321 0322 /* Support for compiler specific function attributes. These are used 0323 * so that where compiler support is available incorrect use of API 0324 * functions in png.h will generate compiler warnings. 0325 * 0326 * Added at libpng-1.2.41. 0327 */ 0328 0329 #ifndef PNG_NO_PEDANTIC_WARNINGS 0330 # ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED 0331 # define PNG_PEDANTIC_WARNINGS_SUPPORTED 0332 # endif 0333 #endif 0334 0335 #ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED 0336 /* Support for compiler specific function attributes. These are used 0337 * so that where compiler support is available, incorrect use of API 0338 * functions in png.h will generate compiler warnings. Added at libpng 0339 * version 1.2.41. Disabling these removes the warnings but may also produce 0340 * less efficient code. 0341 */ 0342 # if defined(__clang__) && defined(__has_attribute) 0343 /* Clang defines both __clang__ and __GNUC__. Check __clang__ first. */ 0344 # if !defined(PNG_USE_RESULT) && __has_attribute(__warn_unused_result__) 0345 # define PNG_USE_RESULT __attribute__((__warn_unused_result__)) 0346 # endif 0347 # if !defined(PNG_NORETURN) && __has_attribute(__noreturn__) 0348 # define PNG_NORETURN __attribute__((__noreturn__)) 0349 # endif 0350 # if !defined(PNG_ALLOCATED) && __has_attribute(__malloc__) 0351 # define PNG_ALLOCATED __attribute__((__malloc__)) 0352 # endif 0353 # if !defined(PNG_DEPRECATED) && __has_attribute(__deprecated__) 0354 # define PNG_DEPRECATED __attribute__((__deprecated__)) 0355 # endif 0356 # if !defined(PNG_PRIVATE) 0357 # ifdef __has_extension 0358 # if __has_extension(attribute_unavailable_with_message) 0359 # define PNG_PRIVATE __attribute__((__unavailable__(\ 0360 "This function is not exported by libpng."))) 0361 # endif 0362 # endif 0363 # endif 0364 # ifndef PNG_RESTRICT 0365 # define PNG_RESTRICT __restrict 0366 # endif 0367 0368 # elif defined(__GNUC__) 0369 # ifndef PNG_USE_RESULT 0370 # define PNG_USE_RESULT __attribute__((__warn_unused_result__)) 0371 # endif 0372 # ifndef PNG_NORETURN 0373 # define PNG_NORETURN __attribute__((__noreturn__)) 0374 # endif 0375 # if __GNUC__ >= 3 0376 # ifndef PNG_ALLOCATED 0377 # define PNG_ALLOCATED __attribute__((__malloc__)) 0378 # endif 0379 # ifndef PNG_DEPRECATED 0380 # define PNG_DEPRECATED __attribute__((__deprecated__)) 0381 # endif 0382 # ifndef PNG_PRIVATE 0383 # if 0 /* Doesn't work so we use deprecated instead*/ 0384 # define PNG_PRIVATE \ 0385 __attribute__((warning("This function is not exported by libpng."))) 0386 # else 0387 # define PNG_PRIVATE \ 0388 __attribute__((__deprecated__)) 0389 # endif 0390 # endif 0391 # if ((__GNUC__ > 3) || !defined(__GNUC_MINOR__) || (__GNUC_MINOR__ >= 1)) 0392 # ifndef PNG_RESTRICT 0393 # define PNG_RESTRICT __restrict 0394 # endif 0395 # endif /* __GNUC__.__GNUC_MINOR__ > 3.0 */ 0396 # endif /* __GNUC__ >= 3 */ 0397 0398 # elif defined(_MSC_VER) && (_MSC_VER >= 1300) 0399 # ifndef PNG_USE_RESULT 0400 # define PNG_USE_RESULT /* not supported */ 0401 # endif 0402 # ifndef PNG_NORETURN 0403 # define PNG_NORETURN __declspec(noreturn) 0404 # endif 0405 # ifndef PNG_ALLOCATED 0406 # if (_MSC_VER >= 1400) 0407 # define PNG_ALLOCATED __declspec(restrict) 0408 # endif 0409 # endif 0410 # ifndef PNG_DEPRECATED 0411 # define PNG_DEPRECATED __declspec(deprecated) 0412 # endif 0413 # ifndef PNG_PRIVATE 0414 # define PNG_PRIVATE __declspec(deprecated) 0415 # endif 0416 # ifndef PNG_RESTRICT 0417 # if (_MSC_VER >= 1400) 0418 # define PNG_RESTRICT __restrict 0419 # endif 0420 # endif 0421 0422 # elif defined(__WATCOMC__) 0423 # ifndef PNG_RESTRICT 0424 # define PNG_RESTRICT __restrict 0425 # endif 0426 # endif 0427 #endif /* PNG_PEDANTIC_WARNINGS */ 0428 0429 #ifndef PNG_DEPRECATED 0430 # define PNG_DEPRECATED /* Use of this function is deprecated */ 0431 #endif 0432 #ifndef PNG_USE_RESULT 0433 # define PNG_USE_RESULT /* The result of this function must be checked */ 0434 #endif 0435 #ifndef PNG_NORETURN 0436 # define PNG_NORETURN /* This function does not return */ 0437 #endif 0438 #ifndef PNG_ALLOCATED 0439 # define PNG_ALLOCATED /* The result of the function is new memory */ 0440 #endif 0441 #ifndef PNG_PRIVATE 0442 # define PNG_PRIVATE /* This is a private libpng function */ 0443 #endif 0444 #ifndef PNG_RESTRICT 0445 # define PNG_RESTRICT /* The C99 "restrict" feature */ 0446 #endif 0447 0448 #ifndef PNG_FP_EXPORT /* A floating point API. */ 0449 # ifdef PNG_FLOATING_POINT_SUPPORTED 0450 # define PNG_FP_EXPORT(ordinal, type, name, args)\ 0451 PNG_EXPORT(ordinal, type, name, args); 0452 # else /* No floating point APIs */ 0453 # define PNG_FP_EXPORT(ordinal, type, name, args) 0454 # endif 0455 #endif 0456 #ifndef PNG_FIXED_EXPORT /* A fixed point API. */ 0457 # ifdef PNG_FIXED_POINT_SUPPORTED 0458 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 0459 PNG_EXPORT(ordinal, type, name, args); 0460 # else /* No fixed point APIs */ 0461 # define PNG_FIXED_EXPORT(ordinal, type, name, args) 0462 # endif 0463 #endif 0464 0465 #ifndef PNG_BUILDING_SYMBOL_TABLE 0466 /* Some typedefs to get us started. These should be safe on most of the common 0467 * platforms. 0468 * 0469 * png_uint_32 and png_int_32 may, currently, be larger than required to hold a 0470 * 32-bit value however this is not normally advisable. 0471 * 0472 * png_uint_16 and png_int_16 should always be two bytes in size - this is 0473 * verified at library build time. 0474 * 0475 * png_byte must always be one byte in size. 0476 * 0477 * The checks below use constants from limits.h, as defined by the ISOC90 0478 * standard. 0479 */ 0480 #if CHAR_BIT == 8 && UCHAR_MAX == 255 0481 typedef unsigned char png_byte; 0482 #else 0483 # error "libpng requires 8-bit bytes" 0484 #endif 0485 0486 #if INT_MIN == -32768 && INT_MAX == 32767 0487 typedef int png_int_16; 0488 #elif SHRT_MIN == -32768 && SHRT_MAX == 32767 0489 typedef short png_int_16; 0490 #else 0491 # error "libpng requires a signed 16-bit type" 0492 #endif 0493 0494 #if UINT_MAX == 65535 0495 typedef unsigned int png_uint_16; 0496 #elif USHRT_MAX == 65535 0497 typedef unsigned short png_uint_16; 0498 #else 0499 # error "libpng requires an unsigned 16-bit type" 0500 #endif 0501 0502 #if INT_MIN < -2147483646 && INT_MAX > 2147483646 0503 typedef int png_int_32; 0504 #elif LONG_MIN < -2147483646 && LONG_MAX > 2147483646 0505 typedef long int png_int_32; 0506 #else 0507 # error "libpng requires a signed 32-bit (or more) type" 0508 #endif 0509 0510 #if UINT_MAX > 4294967294U 0511 typedef unsigned int png_uint_32; 0512 #elif ULONG_MAX > 4294967294U 0513 typedef unsigned long int png_uint_32; 0514 #else 0515 # error "libpng requires an unsigned 32-bit (or more) type" 0516 #endif 0517 0518 /* Prior to 1.6.0, it was possible to disable the use of size_t and ptrdiff_t. 0519 * From 1.6.0 onwards, an ISO C90 compiler, as well as a standard-compliant 0520 * behavior of sizeof and ptrdiff_t are required. 0521 * The legacy typedefs are provided here for backwards compatibility. 0522 */ 0523 typedef size_t png_size_t; 0524 typedef ptrdiff_t png_ptrdiff_t; 0525 0526 /* libpng needs to know the maximum value of 'size_t' and this controls the 0527 * definition of png_alloc_size_t, below. This maximum value of size_t limits 0528 * but does not control the maximum allocations the library makes - there is 0529 * direct application control of this through png_set_user_limits(). 0530 */ 0531 #ifndef PNG_SMALL_SIZE_T 0532 /* Compiler specific tests for systems where size_t is known to be less than 0533 * 32 bits (some of these systems may no longer work because of the lack of 0534 * 'far' support; see above.) 0535 */ 0536 # if (defined(__TURBOC__) && !defined(__FLAT__)) ||\ 0537 (defined(_MSC_VER) && defined(MAXSEG_64K)) 0538 # define PNG_SMALL_SIZE_T 0539 # endif 0540 #endif 0541 0542 /* png_alloc_size_t is guaranteed to be no smaller than size_t, and no smaller 0543 * than png_uint_32. Casts from size_t or png_uint_32 to png_alloc_size_t are 0544 * not necessary; in fact, it is recommended not to use them at all, so that 0545 * the compiler can complain when something turns out to be problematic. 0546 * 0547 * Casts in the other direction (from png_alloc_size_t to size_t or 0548 * png_uint_32) should be explicitly applied; however, we do not expect to 0549 * encounter practical situations that require such conversions. 0550 * 0551 * PNG_SMALL_SIZE_T must be defined if the maximum value of size_t is less than 0552 * 4294967295 - i.e. less than the maximum value of png_uint_32. 0553 */ 0554 #ifdef PNG_SMALL_SIZE_T 0555 typedef png_uint_32 png_alloc_size_t; 0556 #else 0557 typedef size_t png_alloc_size_t; 0558 #endif 0559 0560 /* Prior to 1.6.0 libpng offered limited support for Microsoft C compiler 0561 * implementations of Intel CPU specific support of user-mode segmented address 0562 * spaces, where 16-bit pointers address more than 65536 bytes of memory using 0563 * separate 'segment' registers. The implementation requires two different 0564 * types of pointer (only one of which includes the segment value.) 0565 * 0566 * If required this support is available in version 1.2 of libpng and may be 0567 * available in versions through 1.5, although the correctness of the code has 0568 * not been verified recently. 0569 */ 0570 0571 /* Typedef for floating-point numbers that are converted to fixed-point with a 0572 * multiple of 100,000, e.g., gamma 0573 */ 0574 typedef png_int_32 png_fixed_point; 0575 0576 /* Add typedefs for pointers */ 0577 typedef void * png_voidp; 0578 typedef const void * png_const_voidp; 0579 typedef png_byte * png_bytep; 0580 typedef const png_byte * png_const_bytep; 0581 typedef png_uint_32 * png_uint_32p; 0582 typedef const png_uint_32 * png_const_uint_32p; 0583 typedef png_int_32 * png_int_32p; 0584 typedef const png_int_32 * png_const_int_32p; 0585 typedef png_uint_16 * png_uint_16p; 0586 typedef const png_uint_16 * png_const_uint_16p; 0587 typedef png_int_16 * png_int_16p; 0588 typedef const png_int_16 * png_const_int_16p; 0589 typedef char * png_charp; 0590 typedef const char * png_const_charp; 0591 typedef png_fixed_point * png_fixed_point_p; 0592 typedef const png_fixed_point * png_const_fixed_point_p; 0593 typedef size_t * png_size_tp; 0594 typedef const size_t * png_const_size_tp; 0595 0596 #ifdef PNG_STDIO_SUPPORTED 0597 typedef FILE * png_FILE_p; 0598 #endif 0599 0600 #ifdef PNG_FLOATING_POINT_SUPPORTED 0601 typedef double * png_doublep; 0602 typedef const double * png_const_doublep; 0603 #endif 0604 0605 /* Pointers to pointers; i.e. arrays */ 0606 typedef png_byte * * png_bytepp; 0607 typedef png_uint_32 * * png_uint_32pp; 0608 typedef png_int_32 * * png_int_32pp; 0609 typedef png_uint_16 * * png_uint_16pp; 0610 typedef png_int_16 * * png_int_16pp; 0611 typedef const char * * png_const_charpp; 0612 typedef char * * png_charpp; 0613 typedef png_fixed_point * * png_fixed_point_pp; 0614 #ifdef PNG_FLOATING_POINT_SUPPORTED 0615 typedef double * * png_doublepp; 0616 #endif 0617 0618 /* Pointers to pointers to pointers; i.e., pointer to array */ 0619 typedef char * * * png_charppp; 0620 0621 #endif /* PNG_BUILDING_SYMBOL_TABLE */ 0622 0623 #endif /* PNGCONF_H */
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