1 2 /* pngconf.h - machine configurable file for libpng 3 * 4 * libpng version 1.5.13 - September 27, 2012 5 * 6 * Copyright (c) 1998-2012 Glenn Randers-Pehrson 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 9 * 10 * This code is released under the libpng license. 11 * For conditions of distribution and use, see the disclaimer 12 * and license in png.h 13 * 14 */ 15 16 /* Any machine specific code is near the front of this file, so if you 17 * are configuring libpng for a machine, you may want to read the section 18 * starting here down to where it starts to typedef png_color, png_text, 19 * and png_info. 20 */ 21 22 #ifndef PNGCONF_H 23 #define PNGCONF_H 24 25 #ifndef PNG_BUILDING_SYMBOL_TABLE 26 /* PNG_NO_LIMITS_H may be used to turn off the use of the standard C 27 * definition file for machine specific limits, this may impact the 28 * correctness of the definitions below (see uses of INT_MAX). 29 */ 30 # ifndef PNG_NO_LIMITS_H 31 # include <limits.h> 32 # endif 33 34 /* For the memory copy APIs (i.e. the standard definitions of these), 35 * because this file defines png_memcpy and so on the base APIs must 36 * be defined here. 37 */ 38 # ifdef BSD 39 # include <strings.h> 40 # else 41 # include <string.h> 42 # endif 43 44 /* For png_FILE_p - this provides the standard definition of a 45 * FILE 46 */ 47 # ifdef PNG_STDIO_SUPPORTED 48 # include <stdio.h> 49 # endif 50 #endif 51 52 /* This controls optimization of the reading of 16 and 32 bit values 53 * from PNG files. It can be set on a per-app-file basis - it 54 * just changes whether a macro is used when the function is called. 55 * The library builder sets the default; if read functions are not 56 * built into the library the macro implementation is forced on. 57 */ 58 #ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED 59 # define PNG_USE_READ_MACROS 60 #endif 61 #if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS) 62 # if PNG_DEFAULT_READ_MACROS 63 # define PNG_USE_READ_MACROS 64 # endif 65 #endif 66 67 /* COMPILER SPECIFIC OPTIONS. 68 * 69 * These options are provided so that a variety of difficult compilers 70 * can be used. Some are fixed at build time (e.g. PNG_API_RULE 71 * below) but still have compiler specific implementations, others 72 * may be changed on a per-file basis when compiling against libpng. 73 */ 74 75 /* The PNGARG macro protects us against machines that don't have function 76 * prototypes (ie K&R style headers). If your compiler does not handle 77 * function prototypes, define this macro and use the included ansi2knr. 78 * I've always been able to use _NO_PROTO as the indicator, but you may 79 * need to drag the empty declaration out in front of here, or change the 80 * ifdef to suit your own needs. 81 */ 82 #ifndef PNGARG 83 84 # ifdef OF /* zlib prototype munger */ 85 # define PNGARG(arglist) OF(arglist) 86 # else 87 88 # ifdef _NO_PROTO 89 # define PNGARG(arglist) () 90 # else 91 # define PNGARG(arglist) arglist 92 # endif /* _NO_PROTO */ 93 94 # endif /* OF */ 95 96 #endif /* PNGARG */ 97 98 /* Function calling conventions. 99 * ============================= 100 * Normally it is not necessary to specify to the compiler how to call 101 * a function - it just does it - however on x86 systems derived from 102 * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems 103 * and some others) there are multiple ways to call a function and the 104 * default can be changed on the compiler command line. For this reason 105 * libpng specifies the calling convention of every exported function and 106 * every function called via a user supplied function pointer. This is 107 * done in this file by defining the following macros: 108 * 109 * PNGAPI Calling convention for exported functions. 110 * PNGCBAPI Calling convention for user provided (callback) functions. 111 * PNGCAPI Calling convention used by the ANSI-C library (required 112 * for longjmp callbacks and sometimes used internally to 113 * specify the calling convention for zlib). 114 * 115 * These macros should never be overridden. If it is necessary to 116 * change calling convention in a private build this can be done 117 * by setting PNG_API_RULE (which defaults to 0) to one of the values 118 * below to select the correct 'API' variants. 119 * 120 * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout. 121 * This is correct in every known environment. 122 * PNG_API_RULE=1 Use the operating system convention for PNGAPI and 123 * the 'C' calling convention (from PNGCAPI) for 124 * callbacks (PNGCBAPI). This is no longer required 125 * in any known environment - if it has to be used 126 * please post an explanation of the problem to the 127 * libpng mailing list. 128 * 129 * These cases only differ if the operating system does not use the C 130 * calling convention, at present this just means the above cases 131 * (x86 DOS/Windows sytems) and, even then, this does not apply to 132 * Cygwin running on those systems. 133 * 134 * Note that the value must be defined in pnglibconf.h so that what 135 * the application uses to call the library matches the conventions 136 * set when building the library. 137 */ 138 139 /* Symbol export 140 * ============= 141 * When building a shared library it is almost always necessary to tell 142 * the compiler which symbols to export. The png.h macro 'PNG_EXPORT' 143 * is used to mark the symbols. On some systems these symbols can be 144 * extracted at link time and need no special processing by the compiler, 145 * on other systems the symbols are flagged by the compiler and just 146 * the declaration requires a special tag applied (unfortunately) in a 147 * compiler dependent way. Some systems can do either. 148 * 149 * A small number of older systems also require a symbol from a DLL to 150 * be flagged to the program that calls it. This is a problem because 151 * we do not know in the header file included by application code that 152 * the symbol will come from a shared library, as opposed to a statically 153 * linked one. For this reason the application must tell us by setting 154 * the magic flag PNG_USE_DLL to turn on the special processing before 155 * it includes png.h. 156 * 157 * Four additional macros are used to make this happen: 158 * 159 * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from 160 * the build or imported if PNG_USE_DLL is set - compiler 161 * and system specific. 162 * 163 * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to 164 * 'type', compiler specific. 165 * 166 * PNG_DLL_EXPORT Set to the magic to use during a libpng build to 167 * make a symbol exported from the DLL. Not used in the 168 * public header files; see pngpriv.h for how it is used 169 * in the libpng build. 170 * 171 * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come 172 * from a DLL - used to define PNG_IMPEXP when 173 * PNG_USE_DLL is set. 174 */ 175 176 /* System specific discovery. 177 * ========================== 178 * This code is used at build time to find PNG_IMPEXP, the API settings 179 * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL 180 * import processing is possible. On Windows/x86 systems it also sets 181 * compiler-specific macros to the values required to change the calling 182 * conventions of the various functions. 183 */ 184 #if ( defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\ 185 defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) ) &&\ 186 ( defined(_X86_) || defined(_X64_) || defined(_M_IX86) ||\ 187 defined(_M_X64) || defined(_M_IA64) ) 188 /* Windows system (DOS doesn't support DLLs) running on x86/x64. Includes 189 * builds under Cygwin or MinGW. Also includes Watcom builds but these need 190 * special treatment because they are not compatible with GCC or Visual C 191 * because of different calling conventions. 192 */ 193 # if PNG_API_RULE == 2 194 /* If this line results in an error, either because __watcall is not 195 * understood or because of a redefine just below you cannot use *this* 196 * build of the library with the compiler you are using. *This* build was 197 * build using Watcom and applications must also be built using Watcom! 198 */ 199 # define PNGCAPI __watcall 200 # endif 201 202 # if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800)) 203 # define PNGCAPI __cdecl 204 # if PNG_API_RULE == 1 205 # define PNGAPI __stdcall 206 # endif 207 # else 208 /* An older compiler, or one not detected (erroneously) above, 209 * if necessary override on the command line to get the correct 210 * variants for the compiler. 211 */ 212 # ifndef PNGCAPI 213 # define PNGCAPI _cdecl 214 # endif 215 # if PNG_API_RULE == 1 && !defined(PNGAPI) 216 # define PNGAPI _stdcall 217 # endif 218 # endif /* compiler/api */ 219 /* NOTE: PNGCBAPI always defaults to PNGCAPI. */ 220 221 # if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD) 222 ERROR: PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed 223 # endif 224 225 # if (defined(_MSC_VER) && _MSC_VER < 800) ||\ 226 (defined(__BORLANDC__) && __BORLANDC__ < 0x500) 227 /* older Borland and MSC 228 * compilers used '__export' and required this to be after 229 * the type. 230 */ 231 # ifndef PNG_EXPORT_TYPE 232 # define PNG_EXPORT_TYPE(type) type PNG_IMPEXP 233 # endif 234 # define PNG_DLL_EXPORT __export 235 # else /* newer compiler */ 236 # define PNG_DLL_EXPORT __declspec(dllexport) 237 # ifndef PNG_DLL_IMPORT 238 # define PNG_DLL_IMPORT __declspec(dllimport) 239 # endif 240 # endif /* compiler */ 241 242 #else /* !Windows/x86 */ 243 # if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__) 244 # define PNGAPI _System 245 # else /* !Windows/x86 && !OS/2 */ 246 /* Use the defaults, or define PNG*API on the command line (but 247 * this will have to be done for every compile!) 248 */ 249 # endif /* other system, !OS/2 */ 250 #endif /* !Windows/x86 */ 251 252 /* Now do all the defaulting . */ 253 #ifndef PNGCAPI 254 # define PNGCAPI 255 #endif 256 #ifndef PNGCBAPI 257 # define PNGCBAPI PNGCAPI 258 #endif 259 #ifndef PNGAPI 260 # define PNGAPI PNGCAPI 261 #endif 262 263 /* PNG_IMPEXP may be set on the compilation system command line or (if not set) 264 * then in an internal header file when building the library, otherwise (when 265 * using the library) it is set here. 266 */ 267 #ifndef PNG_IMPEXP 268 # if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT) 269 /* This forces use of a DLL, disallowing static linking */ 270 # define PNG_IMPEXP PNG_DLL_IMPORT 271 # endif 272 273 # ifndef PNG_IMPEXP 274 # define PNG_IMPEXP 275 # endif 276 #endif 277 278 /* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat 279 * 'attributes' as a storage class - the attributes go at the start of the 280 * function definition, and attributes are always appended regardless of the 281 * compiler. This considerably simplifies these macros but may cause problems 282 * if any compilers both need function attributes and fail to handle them as 283 * a storage class (this is unlikely.) 284 */ 285 #ifndef PNG_FUNCTION 286 # define PNG_FUNCTION(type, name, args, attributes) attributes type name args 287 #endif 288 289 #ifndef PNG_EXPORT_TYPE 290 # define PNG_EXPORT_TYPE(type) PNG_IMPEXP type 291 #endif 292 293 /* The ordinal value is only relevant when preprocessing png.h for symbol 294 * table entries, so we discard it here. See the .dfn files in the 295 * scripts directory. 296 */ 297 #ifndef PNG_EXPORTA 298 299 # define PNG_EXPORTA(ordinal, type, name, args, attributes)\ 300 PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args), \ 301 extern attributes) 302 #endif 303 304 /* ANSI-C (C90) does not permit a macro to be invoked with an empty argument, 305 * so make something non-empty to satisfy the requirement: 306 */ 307 #define PNG_EMPTY /*empty list*/ 308 309 #define PNG_EXPORT(ordinal, type, name, args)\ 310 PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY) 311 312 /* Use PNG_REMOVED to comment out a removed interface. */ 313 #ifndef PNG_REMOVED 314 # define PNG_REMOVED(ordinal, type, name, args, attributes) 315 #endif 316 317 #ifndef PNG_CALLBACK 318 # define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args) 319 #endif 320 321 /* Support for compiler specific function attributes. These are used 322 * so that where compiler support is available incorrect use of API 323 * functions in png.h will generate compiler warnings. 324 * 325 * Added at libpng-1.2.41. 326 */ 327 328 #ifndef PNG_NO_PEDANTIC_WARNINGS 329 # ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED 330 # define PNG_PEDANTIC_WARNINGS_SUPPORTED 331 # endif 332 #endif 333 334 #ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED 335 /* Support for compiler specific function attributes. These are used 336 * so that where compiler support is available incorrect use of API 337 * functions in png.h will generate compiler warnings. Added at libpng 338 * version 1.2.41. 339 */ 340 # if defined(__GNUC__) 341 # ifndef PNG_USE_RESULT 342 # define PNG_USE_RESULT __attribute__((__warn_unused_result__)) 343 # endif 344 # ifndef PNG_NORETURN 345 # define PNG_NORETURN __attribute__((__noreturn__)) 346 # endif 347 # if __GNUC__ >= 3 348 # ifndef PNG_ALLOCATED 349 # define PNG_ALLOCATED __attribute__((__malloc__)) 350 # endif 351 # ifndef PNG_DEPRECATED 352 # define PNG_DEPRECATED __attribute__((__deprecated__)) 353 # endif 354 # ifndef PNG_PRIVATE 355 # if 0 /* Doesn't work so we use deprecated instead*/ 356 # define PNG_PRIVATE \ 357 __attribute__((warning("This function is not exported by libpng."))) 358 # else 359 # define PNG_PRIVATE \ 360 __attribute__((__deprecated__)) 361 # endif 362 # endif 363 # endif /* __GNUC__ >= 3 */ 364 # endif /* __GNUC__ */ 365 366 # if defined(_MSC_VER) && (_MSC_VER >= 1300) 367 # ifndef PNG_USE_RESULT 368 # define PNG_USE_RESULT /* not supported */ 369 # endif 370 # ifndef PNG_NORETURN 371 # define PNG_NORETURN __declspec(noreturn) 372 # endif 373 # ifndef PNG_ALLOCATED 374 # if (_MSC_VER >= 1400) 375 # define PNG_ALLOCATED __declspec(restrict) 376 # endif 377 # endif 378 # ifndef PNG_DEPRECATED 379 # define PNG_DEPRECATED __declspec(deprecated) 380 # endif 381 # ifndef PNG_PRIVATE 382 # define PNG_PRIVATE __declspec(deprecated) 383 # endif 384 # endif /* _MSC_VER */ 385 #endif /* PNG_PEDANTIC_WARNINGS */ 386 387 #ifndef PNG_DEPRECATED 388 # define PNG_DEPRECATED /* Use of this function is deprecated */ 389 #endif 390 #ifndef PNG_USE_RESULT 391 # define PNG_USE_RESULT /* The result of this function must be checked */ 392 #endif 393 #ifndef PNG_NORETURN 394 # define PNG_NORETURN /* This function does not return */ 395 #endif 396 #ifndef PNG_ALLOCATED 397 # define PNG_ALLOCATED /* The result of the function is new memory */ 398 #endif 399 #ifndef PNG_PRIVATE 400 # define PNG_PRIVATE /* This is a private libpng function */ 401 #endif 402 #ifndef PNG_FP_EXPORT /* A floating point API. */ 403 # ifdef PNG_FLOATING_POINT_SUPPORTED 404 # define PNG_FP_EXPORT(ordinal, type, name, args)\ 405 PNG_EXPORT(ordinal, type, name, args); 406 # else /* No floating point APIs */ 407 # define PNG_FP_EXPORT(ordinal, type, name, args) 408 # endif 409 #endif 410 #ifndef PNG_FIXED_EXPORT /* A fixed point API. */ 411 # ifdef PNG_FIXED_POINT_SUPPORTED 412 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 413 PNG_EXPORT(ordinal, type, name, args); 414 # else /* No fixed point APIs */ 415 # define PNG_FIXED_EXPORT(ordinal, type, name, args) 416 # endif 417 #endif 418 419 /* The following uses const char * instead of char * for error 420 * and warning message functions, so some compilers won't complain. 421 * If you do not want to use const, define PNG_NO_CONST here. 422 * 423 * This should not change how the APIs are called, so it can be done 424 * on a per-file basis in the application. 425 */ 426 #ifndef PNG_CONST 427 # ifndef PNG_NO_CONST 428 # define PNG_CONST const 429 # else 430 # define PNG_CONST 431 # endif 432 #endif 433 434 /* Some typedefs to get us started. These should be safe on most of the 435 * common platforms. The typedefs should be at least as large as the 436 * numbers suggest (a png_uint_32 must be at least 32 bits long), but they 437 * don't have to be exactly that size. Some compilers dislike passing 438 * unsigned shorts as function parameters, so you may be better off using 439 * unsigned int for png_uint_16. 440 */ 441 442 #if defined(INT_MAX) && (INT_MAX > 0x7ffffffeL) 443 typedef unsigned int png_uint_32; 444 typedef int png_int_32; 445 #else 446 typedef unsigned long png_uint_32; 447 typedef long png_int_32; 448 #endif 449 typedef unsigned short png_uint_16; 450 typedef short png_int_16; 451 typedef unsigned char png_byte; 452 453 #ifdef PNG_NO_SIZE_T 454 typedef unsigned int png_size_t; 455 #else 456 typedef size_t png_size_t; 457 #endif 458 #define png_sizeof(x) (sizeof (x)) 459 460 /* The following is needed for medium model support. It cannot be in the 461 * pngpriv.h header. Needs modification for other compilers besides 462 * MSC. Model independent support declares all arrays and pointers to be 463 * large using the far keyword. The zlib version used must also support 464 * model independent data. As of version zlib 1.0.4, the necessary changes 465 * have been made in zlib. The USE_FAR_KEYWORD define triggers other 466 * changes that are needed. (Tim Wegner) 467 */ 468 469 /* Separate compiler dependencies (problem here is that zlib.h always 470 * defines FAR. (SJT) 471 */ 472 #ifdef __BORLANDC__ 473 # if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__) 474 # define LDATA 1 475 # else 476 # define LDATA 0 477 # endif 478 /* GRR: why is Cygwin in here? Cygwin is not Borland C... */ 479 # if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__) 480 # define PNG_MAX_MALLOC_64K /* only used in build */ 481 # if (LDATA != 1) 482 # ifndef FAR 483 # define FAR __far 484 # endif 485 # define USE_FAR_KEYWORD 486 # endif /* LDATA != 1 */ 487 /* Possibly useful for moving data out of default segment. 488 * Uncomment it if you want. Could also define FARDATA as 489 * const if your compiler supports it. (SJT) 490 # define FARDATA FAR 491 */ 492 # endif /* __WIN32__, __FLAT__, __CYGWIN__ */ 493 #endif /* __BORLANDC__ */ 494 495 496 /* Suggest testing for specific compiler first before testing for 497 * FAR. The Watcom compiler defines both __MEDIUM__ and M_I86MM, 498 * making reliance oncertain keywords suspect. (SJT) 499 */ 500 501 /* MSC Medium model */ 502 #ifdef FAR 503 # ifdef M_I86MM 504 # define USE_FAR_KEYWORD 505 # define FARDATA FAR 506 # include <dos.h> 507 # endif 508 #endif 509 510 /* SJT: default case */ 511 #ifndef FAR 512 # define FAR 513 #endif 514 515 /* At this point FAR is always defined */ 516 #ifndef FARDATA 517 # define FARDATA 518 #endif 519 520 /* Typedef for floating-point numbers that are converted 521 * to fixed-point with a multiple of 100,000, e.g., gamma 522 */ 523 typedef png_int_32 png_fixed_point; 524 525 /* Add typedefs for pointers */ 526 typedef void FAR * png_voidp; 527 typedef PNG_CONST void FAR * png_const_voidp; 528 typedef png_byte FAR * png_bytep; 529 typedef PNG_CONST png_byte FAR * png_const_bytep; 530 typedef png_uint_32 FAR * png_uint_32p; 531 typedef PNG_CONST png_uint_32 FAR * png_const_uint_32p; 532 typedef png_int_32 FAR * png_int_32p; 533 typedef PNG_CONST png_int_32 FAR * png_const_int_32p; 534 typedef png_uint_16 FAR * png_uint_16p; 535 typedef PNG_CONST png_uint_16 FAR * png_const_uint_16p; 536 typedef png_int_16 FAR * png_int_16p; 537 typedef PNG_CONST png_int_16 FAR * png_const_int_16p; 538 typedef char FAR * png_charp; 539 typedef PNG_CONST char FAR * png_const_charp; 540 typedef png_fixed_point FAR * png_fixed_point_p; 541 typedef PNG_CONST png_fixed_point FAR * png_const_fixed_point_p; 542 typedef png_size_t FAR * png_size_tp; 543 typedef PNG_CONST png_size_t FAR * png_const_size_tp; 544 545 #ifdef PNG_STDIO_SUPPORTED 546 typedef FILE * png_FILE_p; 547 #endif 548 549 #ifdef PNG_FLOATING_POINT_SUPPORTED 550 typedef double FAR * png_doublep; 551 typedef PNG_CONST double FAR * png_const_doublep; 552 #endif 553 554 /* Pointers to pointers; i.e. arrays */ 555 typedef png_byte FAR * FAR * png_bytepp; 556 typedef png_uint_32 FAR * FAR * png_uint_32pp; 557 typedef png_int_32 FAR * FAR * png_int_32pp; 558 typedef png_uint_16 FAR * FAR * png_uint_16pp; 559 typedef png_int_16 FAR * FAR * png_int_16pp; 560 typedef PNG_CONST char FAR * FAR * png_const_charpp; 561 typedef char FAR * FAR * png_charpp; 562 typedef png_fixed_point FAR * FAR * png_fixed_point_pp; 563 #ifdef PNG_FLOATING_POINT_SUPPORTED 564 typedef double FAR * FAR * png_doublepp; 565 #endif 566 567 /* Pointers to pointers to pointers; i.e., pointer to array */ 568 typedef char FAR * FAR * FAR * png_charppp; 569 570 /* png_alloc_size_t is guaranteed to be no smaller than png_size_t, 571 * and no smaller than png_uint_32. Casts from png_size_t or png_uint_32 572 * to png_alloc_size_t are not necessary; in fact, it is recommended 573 * not to use them at all so that the compiler can complain when something 574 * turns out to be problematic. 575 * Casts in the other direction (from png_alloc_size_t to png_size_t or 576 * png_uint_32) should be explicitly applied; however, we do not expect 577 * to encounter practical situations that require such conversions. 578 */ 579 #if defined(__TURBOC__) && !defined(__FLAT__) 580 typedef unsigned long png_alloc_size_t; 581 #else 582 # if defined(_MSC_VER) && defined(MAXSEG_64K) 583 typedef unsigned long png_alloc_size_t; 584 # else 585 /* This is an attempt to detect an old Windows system where (int) is 586 * actually 16 bits, in that case png_malloc must have an argument with a 587 * bigger size to accomodate the requirements of the library. 588 */ 589 # if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) && \ 590 (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL) 591 typedef DWORD png_alloc_size_t; 592 # else 593 typedef png_size_t png_alloc_size_t; 594 # endif 595 # endif 596 #endif 597 598 #endif /* PNGCONF_H */ 599