src/png/pngconf.h

   1
   2 /* pngconf.h - machine configurable file for libpng
   3  *
   4  * libpng version 1.6.2 - April 25, 2013
   5  *
   6  * Copyright (c) 1998-2013 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 /* To do: Do all of this in scripts/pnglibconf.dfa */
  26 #ifdef PNG_SAFE_LIMITS_SUPPORTED
  27 #  ifdef PNG_USER_WIDTH_MAX
  28 #    undef PNG_USER_WIDTH_MAX
  29 #    define PNG_USER_WIDTH_MAX 1000000L
  30 #  endif
  31 #  ifdef PNG_USER_HEIGHT_MAX
  32 #    undef PNG_USER_HEIGHT_MAX
  33 #    define PNG_USER_HEIGHT_MAX 1000000L
  34 #  endif
  35 #  ifdef PNG_USER_CHUNK_MALLOC_MAX
  36 #    undef PNG_USER_CHUNK_MALLOC_MAX
  37 #    define PNG_USER_CHUNK_MALLOC_MAX 4000000L
  38 #  endif
  39 #  ifdef PNG_USER_CHUNK_CACHE_MAX
  40 #    undef PNG_USER_CHUNK_CACHE_MAX
  41 #    define PNG_USER_CHUNK_CACHE_MAX 128
  42 #  endif
  43 #endif
  44
  45 #ifndef PNG_BUILDING_SYMBOL_TABLE /* else includes may cause problems */
  46
  47 /* From libpng 1.6.0 libpng requires an ANSI X3.159-1989 ("ISOC90") compliant C
  48  * compiler for correct compilation.  The following header files are required by
  49  * the standard.  If your compiler doesn't provide these header files, or they
  50  * do not match the standard, you will need to provide/improve them.
  51  */
  52 #include <limits.h>
  53 #include <stddef.h>
  54
  55 /* Library header files.  These header files are all defined by ISOC90; libpng
  56  * expects conformant implementations, however, an ISOC90 conformant system need
  57  * not provide these header files if the functionality cannot be implemented.
  58  * In this case it will be necessary to disable the relevant parts of libpng in
  59  * the build of pnglibconf.h.
  60  *
  61  * Prior to 1.6.0 string.h was included here; the API changes in 1.6.0 to not
  62  * include this unnecessary header file.
  63  */
  64
  65 #ifdef PNG_STDIO_SUPPORTED
  66    /* Required for the definition of FILE: */
  67 #  include <stdio.h>
  68 #endif
  69
  70 #ifdef PNG_SETJMP_SUPPORTED
  71    /* Required for the definition of jmp_buf and the declaration of longjmp: */
  72 #  include <setjmp.h>
  73 #endif
  74
  75 #ifdef PNG_CONVERT_tIME_SUPPORTED
  76    /* Required for struct tm: */
  77 #  include <time.h>
  78 #endif
  79
  80 #endif /* PNG_BUILDING_SYMBOL_TABLE */
  81
  82 /* Prior to 1.6.0 it was possible to turn off 'const' in declarations using
  83  * PNG_NO_CONST; this is no longer supported except for data declarations which
  84  * apparently still cause problems in 2011 on some compilers.
  85  */
  86 #define PNG_CONST const /* backward compatibility only */
  87
  88 /* This controls optimization of the reading of 16 and 32 bit values
  89  * from PNG files.  It can be set on a per-app-file basis - it
  90  * just changes whether a macro is used when the function is called.
  91  * The library builder sets the default; if read functions are not
  92  * built into the library the macro implementation is forced on.
  93  */
  94 #ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED
  95 #  define PNG_USE_READ_MACROS
  96 #endif
  97 #if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS)
  98 #  if PNG_DEFAULT_READ_MACROS
  99 #    define PNG_USE_READ_MACROS
 100 #  endif
 101 #endif
 102
 103 /* COMPILER SPECIFIC OPTIONS.
 104  *
 105  * These options are provided so that a variety of difficult compilers
 106  * can be used.  Some are fixed at build time (e.g. PNG_API_RULE
 107  * below) but still have compiler specific implementations, others
 108  * may be changed on a per-file basis when compiling against libpng.
 109  */
 110
 111 /* The PNGARG macro was used in versions of libpng prior to 1.6.0 to protect
 112  * against legacy (pre ISOC90) compilers that did not understand function
 113  * prototypes.  It is not required for modern C compilers.
 114  */
 115 #ifndef PNGARG
 116 #  define PNGARG(arglist) arglist
 117 #endif
 118
 119 /* Function calling conventions.
 120  * =============================
 121  * Normally it is not necessary to specify to the compiler how to call
 122  * a function - it just does it - however on x86 systems derived from
 123  * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems
 124  * and some others) there are multiple ways to call a function and the
 125  * default can be changed on the compiler command line.  For this reason
 126  * libpng specifies the calling convention of every exported function and
 127  * every function called via a user supplied function pointer.  This is
 128  * done in this file by defining the following macros:
 129  *
 130  * PNGAPI    Calling convention for exported functions.
 131  * PNGCBAPI  Calling convention for user provided (callback) functions.
 132  * PNGCAPI   Calling convention used by the ANSI-C library (required
 133  *           for longjmp callbacks and sometimes used internally to
 134  *           specify the calling convention for zlib).
 135  *
 136  * These macros should never be overridden.  If it is necessary to
 137  * change calling convention in a private build this can be done
 138  * by setting PNG_API_RULE (which defaults to 0) to one of the values
 139  * below to select the correct 'API' variants.
 140  *
 141  * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout.
 142  *                This is correct in every known environment.
 143  * PNG_API_RULE=1 Use the operating system convention for PNGAPI and
 144  *                the 'C' calling convention (from PNGCAPI) for
 145  *                callbacks (PNGCBAPI).  This is no longer required
 146  *                in any known environment - if it has to be used
 147  *                please post an explanation of the problem to the
 148  *                libpng mailing list.
 149  *
 150  * These cases only differ if the operating system does not use the C
 151  * calling convention, at present this just means the above cases
 152  * (x86 DOS/Windows sytems) and, even then, this does not apply to
 153  * Cygwin running on those systems.
 154  *
 155  * Note that the value must be defined in pnglibconf.h so that what
 156  * the application uses to call the library matches the conventions
 157  * set when building the library.
 158  */
 159
 160 /* Symbol export
 161  * =============
 162  * When building a shared library it is almost always necessary to tell
 163  * the compiler which symbols to export.  The png.h macro 'PNG_EXPORT'
 164  * is used to mark the symbols.  On some systems these symbols can be
 165  * extracted at link time and need no special processing by the compiler,
 166  * on other systems the symbols are flagged by the compiler and just
 167  * the declaration requires a special tag applied (unfortunately) in a
 168  * compiler dependent way.  Some systems can do either.
 169  *
 170  * A small number of older systems also require a symbol from a DLL to
 171  * be flagged to the program that calls it.  This is a problem because
 172  * we do not know in the header file included by application code that
 173  * the symbol will come from a shared library, as opposed to a statically
 174  * linked one.  For this reason the application must tell us by setting
 175  * the magic flag PNG_USE_DLL to turn on the special processing before
 176  * it includes png.h.
 177  *
 178  * Four additional macros are used to make this happen:
 179  *
 180  * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from
 181  *            the build or imported if PNG_USE_DLL is set - compiler
 182  *            and system specific.
 183  *
 184  * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to
 185  *                       'type', compiler specific.
 186  *
 187  * PNG_DLL_EXPORT Set to the magic to use during a libpng build to
 188  *                make a symbol exported from the DLL.  Not used in the
 189  *                public header files; see pngpriv.h for how it is used
 190  *                in the libpng build.
 191  *
 192  * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come
 193  *                from a DLL - used to define PNG_IMPEXP when
 194  *                PNG_USE_DLL is set.
 195  */
 196
 197 /* System specific discovery.
 198  * ==========================
 199  * This code is used at build time to find PNG_IMPEXP, the API settings
 200  * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL
 201  * import processing is possible.  On Windows systems it also sets
 202  * compiler-specific macros to the values required to change the calling
 203  * conventions of the various functions.
 204  */
 205 #if defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\
 206     defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
 207   /* Windows system (DOS doesn't support DLLs).  Includes builds under Cygwin or
 208    * MinGW on any architecture currently supported by Windows.  Also includes
 209    * Watcom builds but these need special treatment because they are not
 210    * compatible with GCC or Visual C because of different calling conventions.
 211    */
 212 #  if PNG_API_RULE == 2
 213     /* If this line results in an error, either because __watcall is not
 214      * understood or because of a redefine just below you cannot use *this*
 215      * build of the library with the compiler you are using.  *This* build was
 216      * build using Watcom and applications must also be built using Watcom!
 217      */
 218 #    define PNGCAPI __watcall
 219 #  endif
 220
 221 #  if defined(__GNUC__) || (defined(_MSC_VER) && (_MSC_VER >= 800))
 222 #    define PNGCAPI __cdecl
 223 #    if PNG_API_RULE == 1
 224        /* If this line results in an error __stdcall is not understood and
 225         * PNG_API_RULE should not have been set to '1'.
 226         */
 227 #      define PNGAPI __stdcall
 228 #    endif
 229 #  else
 230     /* An older compiler, or one not detected (erroneously) above,
 231      * if necessary override on the command line to get the correct
 232      * variants for the compiler.
 233      */
 234 #    ifndef PNGCAPI
 235 #      define PNGCAPI _cdecl
 236 #    endif
 237 #    if PNG_API_RULE == 1 && !defined(PNGAPI)
 238 #      define PNGAPI _stdcall
 239 #    endif
 240 #  endif /* compiler/api */
 241   /* NOTE: PNGCBAPI always defaults to PNGCAPI. */
 242
 243 #  if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD)
 244 #     error "PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed"
 245 #  endif
 246
 247 #  if (defined(_MSC_VER) && _MSC_VER < 800) ||\
 248       (defined(__BORLANDC__) && __BORLANDC__ < 0x500)
 249     /* older Borland and MSC
 250      * compilers used '__export' and required this to be after
 251      * the type.
 252      */
 253 #    ifndef PNG_EXPORT_TYPE
 254 #      define PNG_EXPORT_TYPE(type) type PNG_IMPEXP
 255 #    endif
 256 #    define PNG_DLL_EXPORT __export
 257 #  else /* newer compiler */
 258 #    define PNG_DLL_EXPORT __declspec(dllexport)
 259 #    ifndef PNG_DLL_IMPORT
 260 #      define PNG_DLL_IMPORT __declspec(dllimport)
 261 #    endif
 262 #  endif /* compiler */
 263
 264 #else /* !Windows */
 265 #  if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
 266 #    define PNGAPI _System
 267 #  else /* !Windows/x86 && !OS/2 */
 268     /* Use the defaults, or define PNG*API on the command line (but
 269      * this will have to be done for every compile!)
 270      */
 271 #  endif /* other system, !OS/2 */
 272 #endif /* !Windows/x86 */
 273
 274 /* Now do all the defaulting . */
 275 #ifndef PNGCAPI
 276 #  define PNGCAPI
 277 #endif
 278 #ifndef PNGCBAPI
 279 #  define PNGCBAPI PNGCAPI
 280 #endif
 281 #ifndef PNGAPI
 282 #  define PNGAPI PNGCAPI
 283 #endif
 284
 285 /* PNG_IMPEXP may be set on the compilation system command line or (if not set)
 286  * then in an internal header file when building the library, otherwise (when
 287  * using the library) it is set here.
 288  */
 289 #ifndef PNG_IMPEXP
 290 #  if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT)
 291      /* This forces use of a DLL, disallowing static linking */
 292 #    define PNG_IMPEXP PNG_DLL_IMPORT
 293 #  endif
 294
 295 #  ifndef PNG_IMPEXP
 296 #    define PNG_IMPEXP
 297 #  endif
 298 #endif
 299
 300 /* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat
 301  * 'attributes' as a storage class - the attributes go at the start of the
 302  * function definition, and attributes are always appended regardless of the
 303  * compiler.  This considerably simplifies these macros but may cause problems
 304  * if any compilers both need function attributes and fail to handle them as
 305  * a storage class (this is unlikely.)
 306  */
 307 #ifndef PNG_FUNCTION
 308 #  define PNG_FUNCTION(type, name, args, attributes) attributes type name args
 309 #endif
 310
 311 #ifndef PNG_EXPORT_TYPE
 312 #  define PNG_EXPORT_TYPE(type) PNG_IMPEXP type
 313 #endif
 314
 315    /* The ordinal value is only relevant when preprocessing png.h for symbol
 316     * table entries, so we discard it here.  See the .dfn files in the
 317     * scripts directory.
 318     */
 319 #ifndef PNG_EXPORTA
 320
 321 #  define PNG_EXPORTA(ordinal, type, name, args, attributes)\
 322       PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args), \
 323         extern attributes)
 324 #endif
 325
 326 /* ANSI-C (C90) does not permit a macro to be invoked with an empty argument,
 327  * so make something non-empty to satisfy the requirement:
 328  */
 329 #define PNG_EMPTY /*empty list*/
 330
 331 #define PNG_EXPORT(ordinal, type, name, args)\
 332    PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY)
 333
 334 /* Use PNG_REMOVED to comment out a removed interface. */
 335 #ifndef PNG_REMOVED
 336 #  define PNG_REMOVED(ordinal, type, name, args, attributes)
 337 #endif
 338
 339 #ifndef PNG_CALLBACK
 340 #  define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args)
 341 #endif
 342
 343 /* Support for compiler specific function attributes.  These are used
 344  * so that where compiler support is available incorrect use of API
 345  * functions in png.h will generate compiler warnings.
 346  *
 347  * Added at libpng-1.2.41.
 348  */
 349
 350 #ifndef PNG_NO_PEDANTIC_WARNINGS
 351 #  ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
 352 #    define PNG_PEDANTIC_WARNINGS_SUPPORTED
 353 #  endif
 354 #endif
 355
 356 #ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
 357   /* Support for compiler specific function attributes.  These are used
 358    * so that where compiler support is available, incorrect use of API
 359    * functions in png.h will generate compiler warnings.  Added at libpng
 360    * version 1.2.41.  Disabling these removes the warnings but may also produce
 361    * less efficient code.
 362    */
 363 #  if defined(__GNUC__)
 364 #    ifndef PNG_USE_RESULT
 365 #      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
 366 #    endif
 367 #    ifndef PNG_NORETURN
 368 #      define PNG_NORETURN   __attribute__((__noreturn__))
 369 #    endif
 370 #    if __GNUC__ >= 3
 371 #      ifndef PNG_ALLOCATED
 372 #        define PNG_ALLOCATED  __attribute__((__malloc__))
 373 #      endif
 374 #      ifndef PNG_DEPRECATED
 375 #        define PNG_DEPRECATED __attribute__((__deprecated__))
 376 #      endif
 377 #      ifndef PNG_PRIVATE
 378 #        if 0 /* Doesn't work so we use deprecated instead*/
 379 #          define PNG_PRIVATE \
 380             __attribute__((warning("This function is not exported by libpng.")))
 381 #        else
 382 #          define PNG_PRIVATE \
 383             __attribute__((__deprecated__))
 384 #        endif
 385 #      endif
 386 #      if ((__GNUC__ != 3) || !defined(__GNUC_MINOR__) || (__GNUC_MINOR__ >= 1))
 387 #        ifndef PNG_RESTRICT
 388 #          define PNG_RESTRICT __restrict
 389 #        endif
 390 #      endif /*  __GNUC__ == 3.0 */
 391 #    endif /*  __GNUC__ >= 3 */
 392
 393 #  elif defined(_MSC_VER)  && (_MSC_VER >= 1300)
 394 #    ifndef PNG_USE_RESULT
 395 #      define PNG_USE_RESULT /* not supported */
 396 #    endif
 397 #    ifndef PNG_NORETURN
 398 #      define PNG_NORETURN   __declspec(noreturn)
 399 #    endif
 400 #    ifndef PNG_ALLOCATED
 401 #      if (_MSC_VER >= 1400)
 402 #        define PNG_ALLOCATED __declspec(restrict)
 403 #      endif
 404 #    endif
 405 #    ifndef PNG_DEPRECATED
 406 #      define PNG_DEPRECATED __declspec(deprecated)
 407 #    endif
 408 #    ifndef PNG_PRIVATE
 409 #      define PNG_PRIVATE __declspec(deprecated)
 410 #    endif
 411 #    ifndef PNG_RESTRICT
 412 #      if (_MSC_VER >= 1400)
 413 #        define PNG_RESTRICT __restrict
 414 #      endif
 415 #    endif
 416
 417 #  elif defined(__WATCOMC__)
 418 #    ifndef PNG_RESTRICT
 419 #      define PNG_RESTRICT __restrict
 420 #    endif
 421 #  endif /* _MSC_VER */
 422 #endif /* PNG_PEDANTIC_WARNINGS */
 423
 424 #ifndef PNG_DEPRECATED
 425 #  define PNG_DEPRECATED  /* Use of this function is deprecated */
 426 #endif
 427 #ifndef PNG_USE_RESULT
 428 #  define PNG_USE_RESULT  /* The result of this function must be checked */
 429 #endif
 430 #ifndef PNG_NORETURN
 431 #  define PNG_NORETURN    /* This function does not return */
 432 #endif
 433 #ifndef PNG_ALLOCATED
 434 #  define PNG_ALLOCATED   /* The result of the function is new memory */
 435 #endif
 436 #ifndef PNG_PRIVATE
 437 #  define PNG_PRIVATE     /* This is a private libpng function */
 438 #endif
 439 #ifndef PNG_RESTRICT
 440 #  define PNG_RESTRICT    /* The C99 "restrict" feature */
 441 #endif
 442 #ifndef PNG_FP_EXPORT     /* A floating point API. */
 443 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 444 #     define PNG_FP_EXPORT(ordinal, type, name, args)\
 445          PNG_EXPORT(ordinal, type, name, args);
 446 #  else                   /* No floating point APIs */
 447 #     define PNG_FP_EXPORT(ordinal, type, name, args)
 448 #  endif
 449 #endif
 450 #ifndef PNG_FIXED_EXPORT  /* A fixed point API. */
 451 #  ifdef PNG_FIXED_POINT_SUPPORTED
 452 #     define PNG_FIXED_EXPORT(ordinal, type, name, args)\
 453          PNG_EXPORT(ordinal, type, name, args);
 454 #  else                   /* No fixed point APIs */
 455 #     define PNG_FIXED_EXPORT(ordinal, type, name, args)
 456 #  endif
 457 #endif
 458
 459 #ifndef PNG_BUILDING_SYMBOL_TABLE
 460 /* Some typedefs to get us started.  These should be safe on most of the common
 461  * platforms.
 462  *
 463  * png_uint_32 and png_int_32 may, currently, be larger than required to hold a
 464  * 32-bit value however this is not normally advisable.
 465  *
 466  * png_uint_16 and png_int_16 should always be two bytes in size - this is
 467  * verified at library build time.
 468  *
 469  * png_byte must always be one byte in size.
 470  *
 471  * The checks below use constants from limits.h, as defined by the ISOC90
 472  * standard.
 473  */
 474 #if CHAR_BIT == 8 && UCHAR_MAX == 255
 475    typedef unsigned char png_byte;
 476 #else
 477 #  error "libpng requires 8 bit bytes"
 478 #endif
 479
 480 #if INT_MIN == -32768 && INT_MAX == 32767
 481    typedef int png_int_16;
 482 #elif SHRT_MIN == -32768 && SHRT_MAX == 32767
 483    typedef short png_int_16;
 484 #else
 485 #  error "libpng requires a signed 16 bit type"
 486 #endif
 487
 488 #if UINT_MAX == 65535
 489    typedef unsigned int png_uint_16;
 490 #elif USHRT_MAX == 65535
 491    typedef unsigned short png_uint_16;
 492 #else
 493 #  error "libpng requires an unsigned 16 bit type"
 494 #endif
 495
 496 #if INT_MIN < -2147483646 && INT_MAX > 2147483646
 497    typedef int png_int_32;
 498 #elif LONG_MIN < -2147483646 && LONG_MAX > 2147483646
 499    typedef long int png_int_32;
 500 #else
 501 #  error "libpng requires a signed 32 bit (or more) type"
 502 #endif
 503
 504 #if UINT_MAX > 4294967294
 505    typedef unsigned int png_uint_32;
 506 #elif ULONG_MAX > 4294967294
 507    typedef unsigned long int png_uint_32;
 508 #else
 509 #  error "libpng requires an unsigned 32 bit (or more) type"
 510 #endif
 511
 512 /* Prior to 1.6.0 it was possible to disable the use of size_t, 1.6.0, however,
 513  * requires an ISOC90 compiler and relies on consistent behavior of sizeof.
 514  */
 515 typedef size_t png_size_t;
 516 typedef ptrdiff_t png_ptrdiff_t;
 517
 518 /* libpng needs to know the maximum value of 'size_t' and this controls the
 519  * definition of png_alloc_size_t, below.  This maximum value of size_t limits
 520  * but does not control the maximum allocations the library makes - there is
 521  * direct application control of this through png_set_user_limits().
 522  */
 523 #ifndef PNG_SMALL_SIZE_T
 524    /* Compiler specific tests for systems where size_t is known to be less than
 525     * 32 bits (some of these systems may no longer work because of the lack of
 526     * 'far' support; see above.)
 527     */
 528 #  if (defined(__TURBOC__) && !defined(__FLAT__)) ||\
 529    (defined(_MSC_VER) && defined(MAXSEG_64K))
 530 #     define PNG_SMALL_SIZE_T
 531 #  endif
 532 #endif
 533
 534 /* png_alloc_size_t is guaranteed to be no smaller than png_size_t, and no
 535  * smaller than png_uint_32.  Casts from png_size_t or png_uint_32 to
 536  * png_alloc_size_t are not necessary; in fact, it is recommended not to use
 537  * them at all so that the compiler can complain when something turns out to be
 538  * problematic.
 539  *
 540  * Casts in the other direction (from png_alloc_size_t to png_size_t or
 541  * png_uint_32) should be explicitly applied; however, we do not expect to
 542  * encounter practical situations that require such conversions.
 543  *
 544  * PNG_SMALL_SIZE_T must be defined if the maximum value of size_t is less than
 545  * 4294967295 - i.e. less than the maximum value of png_uint_32.
 546  */
 547 #ifdef PNG_SMALL_SIZE_T
 548    typedef png_uint_32 png_alloc_size_t;
 549 #else
 550    typedef png_size_t png_alloc_size_t;
 551 #endif
 552
 553 /* Prior to 1.6.0 libpng offered limited support for Microsoft C compiler
 554  * implementations of Intel CPU specific support of user-mode segmented address
 555  * spaces, where 16-bit pointers address more than 65536 bytes of memory using
 556  * separate 'segment' registers.  The implementation requires two different
 557  * types of pointer (only one of which includes the segment value.)
 558  *
 559  * If required this support is available in version 1.2 of libpng and may be
 560  * available in versions through 1.5, although the correctness of the code has
 561  * not been verified recently.
 562  */
 563
 564 /* Typedef for floating-point numbers that are converted to fixed-point with a
 565  * multiple of 100,000, e.g., gamma
 566  */
 567 typedef png_int_32 png_fixed_point;
 568
 569 /* Add typedefs for pointers */
 570 typedef void                  * png_voidp;
 571 typedef const void            * png_const_voidp;
 572 typedef png_byte              * png_bytep;
 573 typedef const png_byte        * png_const_bytep;
 574 typedef png_uint_32           * png_uint_32p;
 575 typedef const png_uint_32     * png_const_uint_32p;
 576 typedef png_int_32            * png_int_32p;
 577 typedef const png_int_32      * png_const_int_32p;
 578 typedef png_uint_16           * png_uint_16p;
 579 typedef const png_uint_16     * png_const_uint_16p;
 580 typedef png_int_16            * png_int_16p;
 581 typedef const png_int_16      * png_const_int_16p;
 582 typedef char                  * png_charp;
 583 typedef const char            * png_const_charp;
 584 typedef png_fixed_point       * png_fixed_point_p;
 585 typedef const png_fixed_point * png_const_fixed_point_p;
 586 typedef png_size_t            * png_size_tp;
 587 typedef const png_size_t      * png_const_size_tp;
 588
 589 #ifdef PNG_STDIO_SUPPORTED
 590 typedef FILE            * png_FILE_p;
 591 #endif
 592
 593 #ifdef PNG_FLOATING_POINT_SUPPORTED
 594 typedef double       * png_doublep;
 595 typedef const double * png_const_doublep;
 596 #endif
 597
 598 /* Pointers to pointers; i.e. arrays */
 599 typedef png_byte        * * png_bytepp;
 600 typedef png_uint_32     * * png_uint_32pp;
 601 typedef png_int_32      * * png_int_32pp;
 602 typedef png_uint_16     * * png_uint_16pp;
 603 typedef png_int_16      * * png_int_16pp;
 604 typedef const char      * * png_const_charpp;
 605 typedef char            * * png_charpp;
 606 typedef png_fixed_point * * png_fixed_point_pp;
 607 #ifdef PNG_FLOATING_POINT_SUPPORTED
 608 typedef double          * * png_doublepp;
 609 #endif
 610
 611 /* Pointers to pointers to pointers; i.e., pointer to array */
 612 typedef char            * * * png_charppp;
 613
 614 #endif /* PNG_BUILDING_SYMBOL_TABLE */
 615
 616 #endif /* PNGCONF_H */