scalos/include/pngconf.h

   1
   2 /* pngconf.h - machine configurable file for libpng
   3  *
   4  * libpng version 1.6.7 - November 14, 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 // AMIGA BEGIN
  26 #undef  PNG_CONSOLE_IO_SUPPORTED
  27 #undef  PNG_MNG_FEATURES_SUPPORTED
  28 #undef  PNG_FLOATING_POINT_SUPPORTED
  29 #undef  PNG_FLOATING_ARITHMETIC_SUPPORTED
  30 #undef  PNG_PROGRESSIVE_READ_SUPPORTED
  31 #undef  PNG_STDIO_SUPPORTED
  32 #define PNG_NO_MNG_FEATURES
  33 #define PNG_NO_FLOATING_POINT_SUPPORTED
  34 #define PNG_NO_CONSOLE_IO
  35 #define PNG_NO_STDIO
  36 #define PNG_NO_PROGRESSIVE_READ
  37 #undef  PNG_WRITE_FLUSH_SUPPORTED
  38 // AMIGA END
  39
  40 /* To do: Do all of this in scripts/pnglibconf.dfa */
  41 #ifdef PNG_SAFE_LIMITS_SUPPORTED
  42 #  ifdef PNG_USER_WIDTH_MAX
  43 #    undef PNG_USER_WIDTH_MAX
  44 #    define PNG_USER_WIDTH_MAX 1000000L
  45 #  endif
  46 #  ifdef PNG_USER_HEIGHT_MAX
  47 #    undef PNG_USER_HEIGHT_MAX
  48 #    define PNG_USER_HEIGHT_MAX 1000000L
  49 #  endif
  50 #  ifdef PNG_USER_CHUNK_MALLOC_MAX
  51 #    undef PNG_USER_CHUNK_MALLOC_MAX
  52 #    define PNG_USER_CHUNK_MALLOC_MAX 4000000L
  53 #  endif
  54 #  ifdef PNG_USER_CHUNK_CACHE_MAX
  55 #    undef PNG_USER_CHUNK_CACHE_MAX
  56 #    define PNG_USER_CHUNK_CACHE_MAX 128
  57 #  endif
  58 #endif
  59
  60 #ifndef PNG_BUILDING_SYMBOL_TABLE /* else includes may cause problems */
  61
  62 /* From libpng 1.6.0 libpng requires an ANSI X3.159-1989 ("ISOC90") compliant C
  63  * compiler for correct compilation.  The following header files are required by
  64  * the standard.  If your compiler doesn't provide these header files, or they
  65  * do not match the standard, you will need to provide/improve them.
  66  */
  67 #include <limits.h>
  68 #include <stddef.h>
  69
  70 /* Library header files.  These header files are all defined by ISOC90; libpng
  71  * expects conformant implementations, however, an ISOC90 conformant system need
  72  * not provide these header files if the functionality cannot be implemented.
  73  * In this case it will be necessary to disable the relevant parts of libpng in
  74  * the build of pnglibconf.h.
  75  *
  76  * Prior to 1.6.0 string.h was included here; the API changes in 1.6.0 to not
  77  * include this unnecessary header file.
  78  */
  79
  80 #ifdef PNG_STDIO_SUPPORTED
  81    /* Required for the definition of FILE: */
  82 #  include <stdio.h>
  83 #endif
  84
  85 #ifdef PNG_SETJMP_SUPPORTED
  86    /* Required for the definition of jmp_buf and the declaration of longjmp: */
  87 #  include <setjmp.h>
  88 #endif
  89
  90 #ifdef PNG_CONVERT_tIME_SUPPORTED
  91    /* Required for struct tm: */
  92 #  include <time.h>
  93 #endif
  94
  95 #endif /* PNG_BUILDING_SYMBOL_TABLE */
  96
  97 /* Prior to 1.6.0 it was possible to turn off 'const' in declarations using
  98  * PNG_NO_CONST; this is no longer supported except for data declarations which
  99  * apparently still cause problems in 2011 on some compilers.
 100  */
 101 #define PNG_CONST const /* backward compatibility only */
 102
 103 /* This controls optimization of the reading of 16 and 32 bit values
 104  * from PNG files.  It can be set on a per-app-file basis - it
 105  * just changes whether a macro is used when the function is called.
 106  * The library builder sets the default; if read functions are not
 107  * built into the library the macro implementation is forced on.
 108  */
 109 #ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED
 110 #  define PNG_USE_READ_MACROS
 111 #endif
 112 #if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS)
 113 #  if PNG_DEFAULT_READ_MACROS
 114 #    define PNG_USE_READ_MACROS
 115 #  endif
 116 #endif
 117
 118 /* COMPILER SPECIFIC OPTIONS.
 119  *
 120  * These options are provided so that a variety of difficult compilers
 121  * can be used.  Some are fixed at build time (e.g. PNG_API_RULE
 122  * below) but still have compiler specific implementations, others
 123  * may be changed on a per-file basis when compiling against libpng.
 124  */
 125
 126 /* The PNGARG macro was used in versions of libpng prior to 1.6.0 to protect
 127  * against legacy (pre ISOC90) compilers that did not understand function
 128  * prototypes.  It is not required for modern C compilers.
 129  */
 130 #ifndef PNGARG
 131 #  define PNGARG(arglist) arglist
 132 #endif
 133
 134 /* Function calling conventions.
 135  * =============================
 136  * Normally it is not necessary to specify to the compiler how to call
 137  * a function - it just does it - however on x86 systems derived from
 138  * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems
 139  * and some others) there are multiple ways to call a function and the
 140  * default can be changed on the compiler command line.  For this reason
 141  * libpng specifies the calling convention of every exported function and
 142  * every function called via a user supplied function pointer.  This is
 143  * done in this file by defining the following macros:
 144  *
 145  * PNGAPI    Calling convention for exported functions.
 146  * PNGCBAPI  Calling convention for user provided (callback) functions.
 147  * PNGCAPI   Calling convention used by the ANSI-C library (required
 148  *           for longjmp callbacks and sometimes used internally to
 149  *           specify the calling convention for zlib).
 150  *
 151  * These macros should never be overridden.  If it is necessary to
 152  * change calling convention in a private build this can be done
 153  * by setting PNG_API_RULE (which defaults to 0) to one of the values
 154  * below to select the correct 'API' variants.
 155  *
 156  * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout.
 157  *                This is correct in every known environment.
 158  * PNG_API_RULE=1 Use the operating system convention for PNGAPI and
 159  *                the 'C' calling convention (from PNGCAPI) for
 160  *                callbacks (PNGCBAPI).  This is no longer required
 161  *                in any known environment - if it has to be used
 162  *                please post an explanation of the problem to the
 163  *                libpng mailing list.
 164  *
 165  * These cases only differ if the operating system does not use the C
 166  * calling convention, at present this just means the above cases
 167  * (x86 DOS/Windows sytems) and, even then, this does not apply to
 168  * Cygwin running on those systems.
 169  *
 170  * Note that the value must be defined in pnglibconf.h so that what
 171  * the application uses to call the library matches the conventions
 172  * set when building the library.
 173  */
 174
 175 /* Symbol export
 176  * =============
 177  * When building a shared library it is almost always necessary to tell
 178  * the compiler which symbols to export.  The png.h macro 'PNG_EXPORT'
 179  * is used to mark the symbols.  On some systems these symbols can be
 180  * extracted at link time and need no special processing by the compiler,
 181  * on other systems the symbols are flagged by the compiler and just
 182  * the declaration requires a special tag applied (unfortunately) in a
 183  * compiler dependent way.  Some systems can do either.
 184  *
 185  * A small number of older systems also require a symbol from a DLL to
 186  * be flagged to the program that calls it.  This is a problem because
 187  * we do not know in the header file included by application code that
 188  * the symbol will come from a shared library, as opposed to a statically
 189  * linked one.  For this reason the application must tell us by setting
 190  * the magic flag PNG_USE_DLL to turn on the special processing before
 191  * it includes png.h.
 192  *
 193  * Four additional macros are used to make this happen:
 194  *
 195  * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from
 196  *            the build or imported if PNG_USE_DLL is set - compiler
 197  *            and system specific.
 198  *
 199  * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to
 200  *                       'type', compiler specific.
 201  *
 202  * PNG_DLL_EXPORT Set to the magic to use during a libpng build to
 203  *                make a symbol exported from the DLL.  Not used in the
 204  *                public header files; see pngpriv.h for how it is used
 205  *                in the libpng build.
 206  *
 207  * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come
 208  *                from a DLL - used to define PNG_IMPEXP when
 209  *                PNG_USE_DLL is set.
 210  */
 211
 212 /* System specific discovery.
 213  * ==========================
 214  * This code is used at build time to find PNG_IMPEXP, the API settings
 215  * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL
 216  * import processing is possible.  On Windows systems it also sets
 217  * compiler-specific macros to the values required to change the calling
 218  * conventions of the various functions.
 219  */
 220 #if defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\
 221     defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
 222   /* Windows system (DOS doesn't support DLLs).  Includes builds under Cygwin or
 223    * MinGW on any architecture currently supported by Windows.  Also includes
 224    * Watcom builds but these need special treatment because they are not
 225    * compatible with GCC or Visual C because of different calling conventions.
 226    */
 227 #  if PNG_API_RULE == 2
 228     /* If this line results in an error, either because __watcall is not
 229      * understood or because of a redefine just below you cannot use *this*
 230      * build of the library with the compiler you are using.  *This* build was
 231      * build using Watcom and applications must also be built using Watcom!
 232      */
 233 #    define PNGCAPI __watcall
 234 #  endif
 235
 236 #  if defined(__GNUC__) || (defined(_MSC_VER) && (_MSC_VER >= 800))
 237 #    define PNGCAPI __cdecl
 238 #    if PNG_API_RULE == 1
 239        /* If this line results in an error __stdcall is not understood and
 240         * PNG_API_RULE should not have been set to '1'.
 241         */
 242 #      define PNGAPI __stdcall
 243 #    endif
 244 #  else
 245     /* An older compiler, or one not detected (erroneously) above,
 246      * if necessary override on the command line to get the correct
 247      * variants for the compiler.
 248      */
 249 #    ifndef PNGCAPI
 250 #      define PNGCAPI _cdecl
 251 #    endif
 252 #    if PNG_API_RULE == 1 && !defined(PNGAPI)
 253 #      define PNGAPI _stdcall
 254 #    endif
 255 #  endif /* compiler/api */
 256
 257   /* NOTE: PNGCBAPI always defaults to PNGCAPI. */
 258
 259 #  if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD)
 260 #     error "PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed"
 261 #  endif
 262
 263 #  if (defined(_MSC_VER) && _MSC_VER < 800) ||\
 264       (defined(__BORLANDC__) && __BORLANDC__ < 0x500)
 265     /* older Borland and MSC
 266      * compilers used '__export' and required this to be after
 267      * the type.
 268      */
 269 #    ifndef PNG_EXPORT_TYPE
 270 #      define PNG_EXPORT_TYPE(type) type PNG_IMPEXP
 271 #    endif
 272 #    define PNG_DLL_EXPORT __export
 273 #  else /* newer compiler */
 274 #    define PNG_DLL_EXPORT __declspec(dllexport)
 275 #    ifndef PNG_DLL_IMPORT
 276 #      define PNG_DLL_IMPORT __declspec(dllimport)
 277 #    endif
 278 #  endif /* compiler */
 279
 280 #else /* !Windows */
 281 #  if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
 282 #    define PNGAPI _System
 283 #  else /* !Windows/x86 && !OS/2 */
 284     /* Use the defaults, or define PNG*API on the command line (but
 285      * this will have to be done for every compile!)
 286      */
 287 #  endif /* other system, !OS/2 */
 288 #endif /* !Windows/x86 */
 289
 290 /* Now do all the defaulting . */
 291 #ifndef PNGCAPI
 292 #  define PNGCAPI
 293 #endif
 294 #ifndef PNGCBAPI
 295 #  define PNGCBAPI PNGCAPI
 296 #endif
 297 #ifndef PNGAPI
 298 #  define PNGAPI PNGCAPI
 299 #endif
 300
 301 /* PNG_IMPEXP may be set on the compilation system command line or (if not set)
 302  * then in an internal header file when building the library, otherwise (when
 303  * using the library) it is set here.
 304  */
 305 #ifndef PNG_IMPEXP
 306 #  if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT)
 307      /* This forces use of a DLL, disallowing static linking */
 308 #    define PNG_IMPEXP PNG_DLL_IMPORT
 309 #  endif
 310
 311 #  ifndef PNG_IMPEXP
 312 #    define PNG_IMPEXP
 313 #  endif
 314 #endif
 315
 316 /* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat
 317  * 'attributes' as a storage class - the attributes go at the start of the
 318  * function definition, and attributes are always appended regardless of the
 319  * compiler.  This considerably simplifies these macros but may cause problems
 320  * if any compilers both need function attributes and fail to handle them as
 321  * a storage class (this is unlikely.)
 322  */
 323 #ifndef PNG_FUNCTION
 324 #  define PNG_FUNCTION(type, name, args, attributes) attributes type name args
 325 #endif
 326
 327 #ifndef PNG_EXPORT_TYPE
 328 #  define PNG_EXPORT_TYPE(type) PNG_IMPEXP type
 329 #endif
 330
 331    /* The ordinal value is only relevant when preprocessing png.h for symbol
 332     * table entries, so we discard it here.  See the .dfn files in the
 333     * scripts directory.
 334     */
 335 #ifndef PNG_EXPORTA
 336
 337 #  define PNG_EXPORTA(ordinal, type, name, args, attributes)\
 338       PNG_FUNCTION(PNG_EXPORT_TYPE(type),(PNGAPI name),PNGARG(args), \
 339         extern attributes)
 340 #endif
 341
 342 /* ANSI-C (C90) does not permit a macro to be invoked with an empty argument,
 343  * so make something non-empty to satisfy the requirement:
 344  */
 345 #define PNG_EMPTY /*empty list*/
 346
 347 #define PNG_EXPORT(ordinal, type, name, args)\
 348    PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY)
 349
 350 /* Use PNG_REMOVED to comment out a removed interface. */
 351 #ifndef PNG_REMOVED
 352 #  define PNG_REMOVED(ordinal, type, name, args, attributes)
 353 #endif
 354
 355 #ifndef PNG_CALLBACK
 356 #  define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args)
 357 #endif
 358
 359 /* Support for compiler specific function attributes.  These are used
 360  * so that where compiler support is available incorrect use of API
 361  * functions in png.h will generate compiler warnings.
 362  *
 363  * Added at libpng-1.2.41.
 364  */
 365
 366 #ifndef PNG_NO_PEDANTIC_WARNINGS
 367 #  ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
 368 #    define PNG_PEDANTIC_WARNINGS_SUPPORTED
 369 #  endif
 370 #endif
 371
 372 #ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
 373   /* Support for compiler specific function attributes.  These are used
 374    * so that where compiler support is available, incorrect use of API
 375    * functions in png.h will generate compiler warnings.  Added at libpng
 376    * version 1.2.41.  Disabling these removes the warnings but may also produce
 377    * less efficient code.
 378    */
 379 #  if defined(__GNUC__)
 380 #    ifndef PNG_USE_RESULT
 381 #      define PNG_USE_RESULT __attribute__((__warn_unused_result__))
 382 #    endif
 383 #    ifndef PNG_NORETURN
 384 #      define PNG_NORETURN   __attribute__((__noreturn__))
 385 #    endif
 386 #    if __GNUC__ >= 3
 387 #      ifndef PNG_ALLOCATED
 388 #        define PNG_ALLOCATED  __attribute__((__malloc__))
 389 #      endif
 390 #      ifndef PNG_DEPRECATED
 391 #        define PNG_DEPRECATED __attribute__((__deprecated__))
 392 #      endif
 393 #      ifndef PNG_PRIVATE
 394 #        if 0 /* Doesn't work so we use deprecated instead*/
 395 #          define PNG_PRIVATE \
 396             __attribute__((warning("This function is not exported by libpng.")))
 397 #        else
 398 #          define PNG_PRIVATE \
 399             __attribute__((__deprecated__))
 400 #        endif
 401 #      endif
 402 #      if ((__GNUC__ != 3) || !defined(__GNUC_MINOR__) || (__GNUC_MINOR__ >= 1))
 403 #        ifndef PNG_RESTRICT
 404 #          define PNG_RESTRICT __restrict
 405 #        endif
 406 #      endif /*  __GNUC__ == 3.0 */
 407 #    endif /*  __GNUC__ >= 3 */
 408
 409 #  elif defined(_MSC_VER)  && (_MSC_VER >= 1300)
 410 #    ifndef PNG_USE_RESULT
 411 #      define PNG_USE_RESULT /* not supported */
 412 #    endif
 413 #    ifndef PNG_NORETURN
 414 #      define PNG_NORETURN   __declspec(noreturn)
 415 #    endif
 416 #    ifndef PNG_ALLOCATED
 417 #      if (_MSC_VER >= 1400)
 418 #        define PNG_ALLOCATED __declspec(restrict)
 419 #      endif
 420 #    endif
 421 #    ifndef PNG_DEPRECATED
 422 #      define PNG_DEPRECATED __declspec(deprecated)
 423 #    endif
 424 #    ifndef PNG_PRIVATE
 425 #      define PNG_PRIVATE __declspec(deprecated)
 426 #    endif
 427 #    ifndef PNG_RESTRICT
 428 #      if (_MSC_VER >= 1400)
 429 #        define PNG_RESTRICT __restrict
 430 #      endif
 431 #    endif
 432
 433 #  elif defined(__WATCOMC__)
 434 #    ifndef PNG_RESTRICT
 435 #      define PNG_RESTRICT __restrict
 436 #    endif
 437 #  endif /* _MSC_VER */
 438 #endif /* PNG_PEDANTIC_WARNINGS */
 439
 440 #ifndef PNG_DEPRECATED
 441 #  define PNG_DEPRECATED  /* Use of this function is deprecated */
 442 #endif
 443 #ifndef PNG_USE_RESULT
 444 #  define PNG_USE_RESULT  /* The result of this function must be checked */
 445 #endif
 446 #ifndef PNG_NORETURN
 447 #  define PNG_NORETURN    /* This function does not return */
 448 #endif
 449 #ifndef PNG_ALLOCATED
 450 #  define PNG_ALLOCATED   /* The result of the function is new memory */
 451 #endif
 452 #ifndef PNG_PRIVATE
 453 #  define PNG_PRIVATE     /* This is a private libpng function */
 454 #endif
 455 #ifndef PNG_RESTRICT
 456 #  define PNG_RESTRICT    /* The C99 "restrict" feature */
 457 #endif
 458 #ifndef PNG_FP_EXPORT     /* A floating point API. */
 459 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 460 #     define PNG_FP_EXPORT(ordinal, type, name, args)\
 461          PNG_EXPORT(ordinal, type, name, args);
 462 #  else                   /* No floating point APIs */
 463 #     define PNG_FP_EXPORT(ordinal, type, name, args)
 464 #  endif
 465 #endif
 466 #ifndef PNG_FIXED_EXPORT  /* A fixed point API. */
 467 #  ifdef PNG_FIXED_POINT_SUPPORTED
 468 #     define PNG_FIXED_EXPORT(ordinal, type, name, args)\
 469          PNG_EXPORT(ordinal, type, name, args);
 470 #  else                   /* No fixed point APIs */
 471 #     define PNG_FIXED_EXPORT(ordinal, type, name, args)
 472 #  endif
 473 #endif
 474
 475 #ifndef PNG_BUILDING_SYMBOL_TABLE
 476 /* Some typedefs to get us started.  These should be safe on most of the common
 477  * platforms.
 478  *
 479  * png_uint_32 and png_int_32 may, currently, be larger than required to hold a
 480  * 32-bit value however this is not normally advisable.
 481  *
 482  * png_uint_16 and png_int_16 should always be two bytes in size - this is
 483  * verified at library build time.
 484  *
 485  * png_byte must always be one byte in size.
 486  *
 487  * The checks below use constants from limits.h, as defined by the ISOC90
 488  * standard.
 489  */
 490 #if CHAR_BIT == 8 && UCHAR_MAX == 255
 491    typedef unsigned char png_byte;
 492 #else
 493 #  error "libpng requires 8 bit bytes"
 494 #endif
 495
 496 #if INT_MIN == -32768 && INT_MAX == 32767
 497    typedef int png_int_16;
 498 #elif SHRT_MIN == -32768 && SHRT_MAX == 32767
 499    typedef short png_int_16;
 500 #else
 501 #  error "libpng requires a signed 16 bit type"
 502 #endif
 503
 504 #if UINT_MAX == 65535
 505    typedef unsigned int png_uint_16;
 506 #elif USHRT_MAX == 65535
 507    typedef unsigned short png_uint_16;
 508 #else
 509 #  error "libpng requires an unsigned 16 bit type"
 510 #endif
 511
 512 #if INT_MIN < -2147483646 && INT_MAX > 2147483646
 513    typedef int png_int_32;
 514 #elif LONG_MIN < -2147483646 && LONG_MAX > 2147483646
 515    typedef long int png_int_32;
 516 #else
 517 #  error "libpng requires a signed 32 bit (or more) type"
 518 #endif
 519
 520 #if UINT_MAX > 4294967294
 521    typedef unsigned int png_uint_32;
 522 #elif ULONG_MAX > 4294967294
 523    typedef unsigned long int png_uint_32;
 524 #else
 525 #  error "libpng requires an unsigned 32 bit (or more) type"
 526 #endif
 527
 528 /* Prior to 1.6.0 it was possible to disable the use of size_t, 1.6.0, however,
 529  * requires an ISOC90 compiler and relies on consistent behavior of sizeof.
 530  */
 531 typedef size_t png_size_t;
 532 typedef ptrdiff_t png_ptrdiff_t;
 533
 534 /* libpng needs to know the maximum value of 'size_t' and this controls the
 535  * definition of png_alloc_size_t, below.  This maximum value of size_t limits
 536  * but does not control the maximum allocations the library makes - there is
 537  * direct application control of this through png_set_user_limits().
 538  */
 539 #ifndef PNG_SMALL_SIZE_T
 540    /* Compiler specific tests for systems where size_t is known to be less than
 541     * 32 bits (some of these systems may no longer work because of the lack of
 542     * 'far' support; see above.)
 543     */
 544 #  if (defined(__TURBOC__) && !defined(__FLAT__)) ||\
 545    (defined(_MSC_VER) && defined(MAXSEG_64K))
 546 #     define PNG_SMALL_SIZE_T
 547 #  endif
 548 #endif
 549
 550 /* png_alloc_size_t is guaranteed to be no smaller than png_size_t, and no
 551  * smaller than png_uint_32.  Casts from png_size_t or png_uint_32 to
 552  * png_alloc_size_t are not necessary; in fact, it is recommended not to use
 553  * them at all so that the compiler can complain when something turns out to be
 554  * problematic.
 555  *
 556  * Casts in the other direction (from png_alloc_size_t to png_size_t or
 557  * png_uint_32) should be explicitly applied; however, we do not expect to
 558  * encounter practical situations that require such conversions.
 559  *
 560  * PNG_SMALL_SIZE_T must be defined if the maximum value of size_t is less than
 561  * 4294967295 - i.e. less than the maximum value of png_uint_32.
 562  */
 563 #ifdef PNG_SMALL_SIZE_T
 564    typedef png_uint_32 png_alloc_size_t;
 565 #else
 566    typedef png_size_t png_alloc_size_t;
 567 #endif
 568
 569 /* Prior to 1.6.0 libpng offered limited support for Microsoft C compiler
 570  * implementations of Intel CPU specific support of user-mode segmented address
 571  * spaces, where 16-bit pointers address more than 65536 bytes of memory using
 572  * separate 'segment' registers.  The implementation requires two different
 573  * types of pointer (only one of which includes the segment value.)
 574  *
 575  * If required this support is available in version 1.2 of libpng and may be
 576  * available in versions through 1.5, although the correctness of the code has
 577  * not been verified recently.
 578  */
 579
 580 /* Typedef for floating-point numbers that are converted to fixed-point with a
 581  * multiple of 100,000, e.g., gamma
 582  */
 583 typedef png_int_32 png_fixed_point;
 584
 585 /* Add typedefs for pointers */
 586 typedef void                  * png_voidp;
 587 typedef const void            * png_const_voidp;
 588 typedef png_byte              * png_bytep;
 589 typedef const png_byte        * png_const_bytep;
 590 typedef png_uint_32           * png_uint_32p;
 591 typedef const png_uint_32     * png_const_uint_32p;
 592 typedef png_int_32            * png_int_32p;
 593 typedef const png_int_32      * png_const_int_32p;
 594 typedef png_uint_16           * png_uint_16p;
 595 typedef const png_uint_16     * png_const_uint_16p;
 596 typedef png_int_16            * png_int_16p;
 597 typedef const png_int_16      * png_const_int_16p;
 598 typedef char                  * png_charp;
 599 typedef const char            * png_const_charp;
 600 typedef png_fixed_point       * png_fixed_point_p;
 601 typedef const png_fixed_point * png_const_fixed_point_p;
 602 typedef png_size_t            * png_size_tp;
 603 typedef const png_size_t      * png_const_size_tp;
 604
 605 #ifdef PNG_STDIO_SUPPORTED
 606 typedef FILE            * png_FILE_p;
 607 #endif
 608
 609 #ifdef PNG_FLOATING_POINT_SUPPORTED
 610 typedef double       * png_doublep;
 611 typedef const double * png_const_doublep;
 612 #endif
 613
 614 /* Pointers to pointers; i.e. arrays */
 615 typedef png_byte        * * png_bytepp;
 616 typedef png_uint_32     * * png_uint_32pp;
 617 typedef png_int_32      * * png_int_32pp;
 618 typedef png_uint_16     * * png_uint_16pp;
 619 typedef png_int_16      * * png_int_16pp;
 620 typedef const char      * * png_const_charpp;
 621 typedef char            * * png_charpp;
 622 typedef png_fixed_point * * png_fixed_point_pp;
 623 #ifdef PNG_FLOATING_POINT_SUPPORTED
 624 typedef double          * * png_doublepp;
 625 #endif
 626
 627 /* Pointers to pointers to pointers; i.e., pointer to array */
 628 typedef char            * * * png_charppp;
 629
 630 #endif /* PNG_BUILDING_SYMBOL_TABLE */
 631
 632 #endif /* PNGCONF_H */