1 2/* pngconf.h - machine configurable file for libpng 3 * 4 * libpng version 1.6.22rc01, May 14, 2016 5 * 6 * Copyright (c) 1998-2002,2004,2006-2015 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 * Any machine specific code is near the front of this file, so if you 15 * are configuring libpng for a machine, you may want to read the section 16 * starting here down to where it starts to typedef png_color, png_text, 17 * and png_info. 18 */ 19 20#ifndef PNGCONF_H 21#define PNGCONF_H 22 23#ifndef PNG_BUILDING_SYMBOL_TABLE /* else includes may cause problems */ 24 25/* From libpng 1.6.0 libpng requires an ANSI X3.159-1989 ("ISOC90") compliant C 26 * compiler for correct compilation. The following header files are required by 27 * the standard. If your compiler doesn't provide these header files, or they 28 * do not match the standard, you will need to provide/improve them. 29 */ 30#include <limits.h> 31#include <stddef.h> 32 33/* Library header files. These header files are all defined by ISOC90; libpng 34 * expects conformant implementations, however, an ISOC90 conformant system need 35 * not provide these header files if the functionality cannot be implemented. 36 * In this case it will be necessary to disable the relevant parts of libpng in 37 * the build of pnglibconf.h. 38 * 39 * Prior to 1.6.0 string.h was included here; the API changes in 1.6.0 to not 40 * include this unnecessary header file. 41 */ 42 43#ifdef PNG_STDIO_SUPPORTED 44 /* Required for the definition of FILE: */ 45# include <stdio.h> 46#endif 47 48#ifdef PNG_SETJMP_SUPPORTED 49 /* Required for the definition of jmp_buf and the declaration of longjmp: */ 50# include <setjmp.h> 51#endif 52 53#ifdef PNG_CONVERT_tIME_SUPPORTED 54 /* Required for struct tm: */ 55# include <time.h> 56#endif 57 58#endif /* PNG_BUILDING_SYMBOL_TABLE */ 59 60/* Prior to 1.6.0 it was possible to turn off 'const' in declarations using 61 * PNG_NO_CONST; this is no longer supported except for data declarations which 62 * apparently still cause problems in 2011 on some compilers. 63 */ 64#define PNG_CONST const /* backward compatibility only */ 65 66/* This controls optimization of the reading of 16-bit and 32-bit values 67 * from PNG files. It can be set on a per-app-file basis - it 68 * just changes whether a macro is used when the function is called. 69 * The library builder sets the default; if read functions are not 70 * built into the library the macro implementation is forced on. 71 */ 72#ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED 73# define PNG_USE_READ_MACROS 74#endif 75#if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS) 76# if PNG_DEFAULT_READ_MACROS 77# define PNG_USE_READ_MACROS 78# endif 79#endif 80 81/* COMPILER SPECIFIC OPTIONS. 82 * 83 * These options are provided so that a variety of difficult compilers 84 * can be used. Some are fixed at build time (e.g. PNG_API_RULE 85 * below) but still have compiler specific implementations, others 86 * may be changed on a per-file basis when compiling against libpng. 87 */ 88 89/* The PNGARG macro was used in versions of libpng prior to 1.6.0 to protect 90 * against legacy (pre ISOC90) compilers that did not understand function 91 * prototypes. It is not required for modern C compilers. 92 */ 93#ifndef PNGARG 94# define PNGARG(arglist) arglist 95#endif 96 97/* Function calling conventions. 98 * ============================= 99 * Normally it is not necessary to specify to the compiler how to call 100 * a function - it just does it - however on x86 systems derived from 101 * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems 102 * and some others) there are multiple ways to call a function and the 103 * default can be changed on the compiler command line. For this reason 104 * libpng specifies the calling convention of every exported function and 105 * every function called via a user supplied function pointer. This is 106 * done in this file by defining the following macros: 107 * 108 * PNGAPI Calling convention for exported functions. 109 * PNGCBAPI Calling convention for user provided (callback) functions. 110 * PNGCAPI Calling convention used by the ANSI-C library (required 111 * for longjmp callbacks and sometimes used internally to 112 * specify the calling convention for zlib). 113 * 114 * These macros should never be overridden. If it is necessary to 115 * change calling convention in a private build this can be done 116 * by setting PNG_API_RULE (which defaults to 0) to one of the values 117 * below to select the correct 'API' variants. 118 * 119 * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout. 120 * This is correct in every known environment. 121 * PNG_API_RULE=1 Use the operating system convention for PNGAPI and 122 * the 'C' calling convention (from PNGCAPI) for 123 * callbacks (PNGCBAPI). This is no longer required 124 * in any known environment - if it has to be used 125 * please post an explanation of the problem to the 126 * libpng mailing list. 127 * 128 * These cases only differ if the operating system does not use the C 129 * calling convention, at present this just means the above cases 130 * (x86 DOS/Windows sytems) and, even then, this does not apply to 131 * Cygwin running on those systems. 132 * 133 * Note that the value must be defined in pnglibconf.h so that what 134 * the application uses to call the library matches the conventions 135 * set when building the library. 136 */ 137 138/* Symbol export 139 * ============= 140 * When building a shared library it is almost always necessary to tell 141 * the compiler which symbols to export. The png.h macro 'PNG_EXPORT' 142 * is used to mark the symbols. On some systems these symbols can be 143 * extracted at link time and need no special processing by the compiler, 144 * on other systems the symbols are flagged by the compiler and just 145 * the declaration requires a special tag applied (unfortunately) in a 146 * compiler dependent way. Some systems can do either. 147 * 148 * A small number of older systems also require a symbol from a DLL to 149 * be flagged to the program that calls it. This is a problem because 150 * we do not know in the header file included by application code that 151 * the symbol will come from a shared library, as opposed to a statically 152 * linked one. For this reason the application must tell us by setting 153 * the magic flag PNG_USE_DLL to turn on the special processing before 154 * it includes png.h. 155 * 156 * Four additional macros are used to make this happen: 157 * 158 * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from 159 * the build or imported if PNG_USE_DLL is set - compiler 160 * and system specific. 161 * 162 * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to 163 * 'type', compiler specific. 164 * 165 * PNG_DLL_EXPORT Set to the magic to use during a libpng build to 166 * make a symbol exported from the DLL. Not used in the 167 * public header files; see pngpriv.h for how it is used 168 * in the libpng build. 169 * 170 * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come 171 * from a DLL - used to define PNG_IMPEXP when 172 * PNG_USE_DLL is set. 173 */ 174 175/* System specific discovery. 176 * ========================== 177 * This code is used at build time to find PNG_IMPEXP, the API settings 178 * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL 179 * import processing is possible. On Windows systems it also sets 180 * compiler-specific macros to the values required to change the calling 181 * conventions of the various functions. 182 */ 183#if defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\ 184 defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) 185 /* Windows system (DOS doesn't support DLLs). Includes builds under Cygwin or 186 * MinGW on any architecture currently supported by Windows. Also includes 187 * Watcom builds but these need special treatment because they are not 188 * compatible with GCC or Visual C because of different calling conventions. 189 */ 190# if PNG_API_RULE == 2 191 /* If this line results in an error, either because __watcall is not 192 * understood or because of a redefine just below you cannot use *this* 193 * build of the library with the compiler you are using. *This* build was 194 * build using Watcom and applications must also be built using Watcom! 195 */ 196# define PNGCAPI __watcall 197# endif 198 199# if defined(__GNUC__) || (defined(_MSC_VER) && (_MSC_VER >= 800)) 200# define PNGCAPI __cdecl 201# if PNG_API_RULE == 1 202 /* If this line results in an error __stdcall is not understood and 203 * PNG_API_RULE should not have been set to '1'. 204 */ 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 */ 219 220 /* NOTE: PNGCBAPI always defaults to PNGCAPI. */ 221 222# if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD) 223# error "PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed" 224# endif 225 226# if (defined(_MSC_VER) && _MSC_VER < 800) ||\ 227 (defined(__BORLANDC__) && __BORLANDC__ < 0x500) 228 /* older Borland and MSC 229 * compilers used '__export' and required this to be after 230 * the type. 231 */ 232# ifndef PNG_EXPORT_TYPE 233# define PNG_EXPORT_TYPE(type) type PNG_IMPEXP 234# endif 235# define PNG_DLL_EXPORT __export 236# else /* newer compiler */ 237# define PNG_DLL_EXPORT __declspec(dllexport) 238# ifndef PNG_DLL_IMPORT 239# define PNG_DLL_IMPORT __declspec(dllimport) 240# endif 241# endif /* compiler */ 242 243#else /* !Windows */ 244# if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__) 245# define PNGAPI _System 246# else /* !Windows/x86 && !OS/2 */ 247 /* Use the defaults, or define PNG*API on the command line (but 248 * this will have to be done for every compile!) 249 */ 250# endif /* other system, !OS/2 */ 251#endif /* !Windows/x86 */ 252 253/* Now do all the defaulting . */ 254#ifndef PNGCAPI 255# define PNGCAPI 256#endif 257#ifndef PNGCBAPI 258# define PNGCBAPI PNGCAPI 259#endif 260#ifndef PNGAPI 261# define PNGAPI PNGCAPI 262#endif 263 264/* PNG_IMPEXP may be set on the compilation system command line or (if not set) 265 * then in an internal header file when building the library, otherwise (when 266 * using the library) it is set here. 267 */ 268#ifndef PNG_IMPEXP 269# if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT) 270 /* This forces use of a DLL, disallowing static linking */ 271# define PNG_IMPEXP PNG_DLL_IMPORT 272# endif 273 274# ifndef PNG_IMPEXP 275# define PNG_IMPEXP 276# endif 277#endif 278 279/* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat 280 * 'attributes' as a storage class - the attributes go at the start of the 281 * function definition, and attributes are always appended regardless of the 282 * compiler. This considerably simplifies these macros but may cause problems 283 * if any compilers both need function attributes and fail to handle them as 284 * a storage class (this is unlikely.) 285 */ 286#ifndef PNG_FUNCTION 287# define PNG_FUNCTION(type, name, args, attributes) attributes type name args 288#endif 289 290#ifndef PNG_EXPORT_TYPE 291# define PNG_EXPORT_TYPE(type) PNG_IMPEXP type 292#endif 293 294 /* The ordinal value is only relevant when preprocessing png.h for symbol 295 * table entries, so we discard it here. See the .dfn files in the 296 * scripts directory. 297 */ 298 299#ifndef PNG_EXPORTA 300# define PNG_EXPORTA(ordinal, type, name, args, attributes) \ 301 PNG_FUNCTION(PNG_EXPORT_TYPE(type), (PNGAPI name), PNGARG(args), \ 302 PNG_LINKAGE_API attributes) 303#endif 304 305/* ANSI-C (C90) does not permit a macro to be invoked with an empty argument, 306 * so make something non-empty to satisfy the requirement: 307 */ 308#define PNG_EMPTY /*empty list*/ 309 310#define PNG_EXPORT(ordinal, type, name, args) \ 311 PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY) 312 313/* Use PNG_REMOVED to comment out a removed interface. */ 314#ifndef PNG_REMOVED 315# define PNG_REMOVED(ordinal, type, name, args, attributes) 316#endif 317 318#ifndef PNG_CALLBACK 319# define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args) 320#endif 321 322/* Support for compiler specific function attributes. These are used 323 * so that where compiler support is available incorrect use of API 324 * functions in png.h will generate compiler warnings. 325 * 326 * Added at libpng-1.2.41. 327 */ 328 329#ifndef PNG_NO_PEDANTIC_WARNINGS 330# ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED 331# define PNG_PEDANTIC_WARNINGS_SUPPORTED 332# endif 333#endif 334 335#ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED 336 /* Support for compiler specific function attributes. These are used 337 * so that where compiler support is available, incorrect use of API 338 * functions in png.h will generate compiler warnings. Added at libpng 339 * version 1.2.41. Disabling these removes the warnings but may also produce 340 * less efficient code. 341 */ 342# if defined(__clang__) && defined(__has_attribute) 343 /* Clang defines both __clang__ and __GNUC__. Check __clang__ first. */ 344# if !defined(PNG_USE_RESULT) && __has_attribute(__warn_unused_result__) 345# define PNG_USE_RESULT __attribute__((__warn_unused_result__)) 346# endif 347# if !defined(PNG_NORETURN) && __has_attribute(__noreturn__) 348# define PNG_NORETURN __attribute__((__noreturn__)) 349# endif 350# if !defined(PNG_ALLOCATED) && __has_attribute(__malloc__) 351# define PNG_ALLOCATED __attribute__((__malloc__)) 352# endif 353# if !defined(PNG_DEPRECATED) && __has_attribute(__deprecated__) 354# define PNG_DEPRECATED __attribute__((__deprecated__)) 355# endif 356# if !defined(PNG_PRIVATE) 357# ifdef __has_extension 358# if __has_extension(attribute_unavailable_with_message) 359# define PNG_PRIVATE __attribute__((__unavailable__(\ 360 "This function is not exported by libpng."))) 361# endif 362# endif 363# endif 364# ifndef PNG_RESTRICT 365# define PNG_RESTRICT __restrict 366# endif 367 368# elif defined(__GNUC__) 369# ifndef PNG_USE_RESULT 370# define PNG_USE_RESULT __attribute__((__warn_unused_result__)) 371# endif 372# ifndef PNG_NORETURN 373# define PNG_NORETURN __attribute__((__noreturn__)) 374# endif 375# if __GNUC__ >= 3 376# ifndef PNG_ALLOCATED 377# define PNG_ALLOCATED __attribute__((__malloc__)) 378# endif 379# ifndef PNG_DEPRECATED 380# define PNG_DEPRECATED __attribute__((__deprecated__)) 381# endif 382# ifndef PNG_PRIVATE 383# if 0 /* Doesn't work so we use deprecated instead*/ 384# define PNG_PRIVATE \ 385 __attribute__((warning("This function is not exported by libpng."))) 386# else 387# define PNG_PRIVATE \ 388 __attribute__((__deprecated__)) 389# endif 390# endif 391# if ((__GNUC__ > 3) || !defined(__GNUC_MINOR__) || (__GNUC_MINOR__ >= 1)) 392# ifndef PNG_RESTRICT 393# define PNG_RESTRICT __restrict 394# endif 395# endif /* __GNUC__.__GNUC_MINOR__ > 3.0 */ 396# endif /* __GNUC__ >= 3 */ 397 398# elif defined(_MSC_VER) && (_MSC_VER >= 1300) 399# ifndef PNG_USE_RESULT 400# define PNG_USE_RESULT /* not supported */ 401# endif 402# ifndef PNG_NORETURN 403# define PNG_NORETURN __declspec(noreturn) 404# endif 405# ifndef PNG_ALLOCATED 406# if (_MSC_VER >= 1400) 407# define PNG_ALLOCATED __declspec(restrict) 408# endif 409# endif 410# ifndef PNG_DEPRECATED 411# define PNG_DEPRECATED __declspec(deprecated) 412# endif 413# ifndef PNG_PRIVATE 414# define PNG_PRIVATE __declspec(deprecated) 415# endif 416# ifndef PNG_RESTRICT 417# if (_MSC_VER >= 1400) 418# define PNG_RESTRICT __restrict 419# endif 420# endif 421 422# elif defined(__WATCOMC__) 423# ifndef PNG_RESTRICT 424# define PNG_RESTRICT __restrict 425# endif 426# endif 427#endif /* PNG_PEDANTIC_WARNINGS */ 428 429#ifndef PNG_DEPRECATED 430# define PNG_DEPRECATED /* Use of this function is deprecated */ 431#endif 432#ifndef PNG_USE_RESULT 433# define PNG_USE_RESULT /* The result of this function must be checked */ 434#endif 435#ifndef PNG_NORETURN 436# define PNG_NORETURN /* This function does not return */ 437#endif 438#ifndef PNG_ALLOCATED 439# define PNG_ALLOCATED /* The result of the function is new memory */ 440#endif 441#ifndef PNG_PRIVATE 442# define PNG_PRIVATE /* This is a private libpng function */ 443#endif 444#ifndef PNG_RESTRICT 445# define PNG_RESTRICT /* The C99 "restrict" feature */ 446#endif 447 448#ifndef PNG_FP_EXPORT /* A floating point API. */ 449# ifdef PNG_FLOATING_POINT_SUPPORTED 450# define PNG_FP_EXPORT(ordinal, type, name, args)\ 451 PNG_EXPORT(ordinal, type, name, args); 452# else /* No floating point APIs */ 453# define PNG_FP_EXPORT(ordinal, type, name, args) 454# endif 455#endif 456#ifndef PNG_FIXED_EXPORT /* A fixed point API. */ 457# ifdef PNG_FIXED_POINT_SUPPORTED 458# define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 459 PNG_EXPORT(ordinal, type, name, args); 460# else /* No fixed point APIs */ 461# define PNG_FIXED_EXPORT(ordinal, type, name, args) 462# endif 463#endif 464 465#ifndef PNG_BUILDING_SYMBOL_TABLE 466/* Some typedefs to get us started. These should be safe on most of the common 467 * platforms. 468 * 469 * png_uint_32 and png_int_32 may, currently, be larger than required to hold a 470 * 32-bit value however this is not normally advisable. 471 * 472 * png_uint_16 and png_int_16 should always be two bytes in size - this is 473 * verified at library build time. 474 * 475 * png_byte must always be one byte in size. 476 * 477 * The checks below use constants from limits.h, as defined by the ISOC90 478 * standard. 479 */ 480#if CHAR_BIT == 8 && UCHAR_MAX == 255 481 typedef unsigned char png_byte; 482#else 483# error "libpng requires 8-bit bytes" 484#endif 485 486#if INT_MIN == -32768 && INT_MAX == 32767 487 typedef int png_int_16; 488#elif SHRT_MIN == -32768 && SHRT_MAX == 32767 489 typedef short png_int_16; 490#else 491# error "libpng requires a signed 16-bit type" 492#endif 493 494#if UINT_MAX == 65535 495 typedef unsigned int png_uint_16; 496#elif USHRT_MAX == 65535 497 typedef unsigned short png_uint_16; 498#else 499# error "libpng requires an unsigned 16-bit type" 500#endif 501 502#if INT_MIN < -2147483646 && INT_MAX > 2147483646 503 typedef int png_int_32; 504#elif LONG_MIN < -2147483646 && LONG_MAX > 2147483646 505 typedef long int png_int_32; 506#else 507# error "libpng requires a signed 32-bit (or more) type" 508#endif 509 510#if UINT_MAX > 4294967294 511 typedef unsigned int png_uint_32; 512#elif ULONG_MAX > 4294967294 513 typedef unsigned long int png_uint_32; 514#else 515# error "libpng requires an unsigned 32-bit (or more) type" 516#endif 517 518/* Prior to 1.6.0 it was possible to disable the use of size_t, 1.6.0, however, 519 * requires an ISOC90 compiler and relies on consistent behavior of sizeof. 520 */ 521typedef size_t png_size_t; 522typedef ptrdiff_t png_ptrdiff_t; 523 524/* libpng needs to know the maximum value of 'size_t' and this controls the 525 * definition of png_alloc_size_t, below. This maximum value of size_t limits 526 * but does not control the maximum allocations the library makes - there is 527 * direct application control of this through png_set_user_limits(). 528 */ 529#ifndef PNG_SMALL_SIZE_T 530 /* Compiler specific tests for systems where size_t is known to be less than 531 * 32 bits (some of these systems may no longer work because of the lack of 532 * 'far' support; see above.) 533 */ 534# if (defined(__TURBOC__) && !defined(__FLAT__)) ||\ 535 (defined(_MSC_VER) && defined(MAXSEG_64K)) 536# define PNG_SMALL_SIZE_T 537# endif 538#endif 539 540/* png_alloc_size_t is guaranteed to be no smaller than png_size_t, and no 541 * smaller than png_uint_32. Casts from png_size_t or png_uint_32 to 542 * png_alloc_size_t are not necessary; in fact, it is recommended not to use 543 * them at all so that the compiler can complain when something turns out to be 544 * problematic. 545 * 546 * Casts in the other direction (from png_alloc_size_t to png_size_t or 547 * png_uint_32) should be explicitly applied; however, we do not expect to 548 * encounter practical situations that require such conversions. 549 * 550 * PNG_SMALL_SIZE_T must be defined if the maximum value of size_t is less than 551 * 4294967295 - i.e. less than the maximum value of png_uint_32. 552 */ 553#ifdef PNG_SMALL_SIZE_T 554 typedef png_uint_32 png_alloc_size_t; 555#else 556 typedef png_size_t png_alloc_size_t; 557#endif 558 559/* Prior to 1.6.0 libpng offered limited support for Microsoft C compiler 560 * implementations of Intel CPU specific support of user-mode segmented address 561 * spaces, where 16-bit pointers address more than 65536 bytes of memory using 562 * separate 'segment' registers. The implementation requires two different 563 * types of pointer (only one of which includes the segment value.) 564 * 565 * If required this support is available in version 1.2 of libpng and may be 566 * available in versions through 1.5, although the correctness of the code has 567 * not been verified recently. 568 */ 569 570/* Typedef for floating-point numbers that are converted to fixed-point with a 571 * multiple of 100,000, e.g., gamma 572 */ 573typedef png_int_32 png_fixed_point; 574 575/* Add typedefs for pointers */ 576typedef void * png_voidp; 577typedef const void * png_const_voidp; 578typedef png_byte * png_bytep; 579typedef const png_byte * png_const_bytep; 580typedef png_uint_32 * png_uint_32p; 581typedef const png_uint_32 * png_const_uint_32p; 582typedef png_int_32 * png_int_32p; 583typedef const png_int_32 * png_const_int_32p; 584typedef png_uint_16 * png_uint_16p; 585typedef const png_uint_16 * png_const_uint_16p; 586typedef png_int_16 * png_int_16p; 587typedef const png_int_16 * png_const_int_16p; 588typedef char * png_charp; 589typedef const char * png_const_charp; 590typedef png_fixed_point * png_fixed_point_p; 591typedef const png_fixed_point * png_const_fixed_point_p; 592typedef png_size_t * png_size_tp; 593typedef const png_size_t * png_const_size_tp; 594 595#ifdef PNG_STDIO_SUPPORTED 596typedef FILE * png_FILE_p; 597#endif 598 599#ifdef PNG_FLOATING_POINT_SUPPORTED 600typedef double * png_doublep; 601typedef const double * png_const_doublep; 602#endif 603 604/* Pointers to pointers; i.e. arrays */ 605typedef png_byte * * png_bytepp; 606typedef png_uint_32 * * png_uint_32pp; 607typedef png_int_32 * * png_int_32pp; 608typedef png_uint_16 * * png_uint_16pp; 609typedef png_int_16 * * png_int_16pp; 610typedef const char * * png_const_charpp; 611typedef char * * png_charpp; 612typedef png_fixed_point * * png_fixed_point_pp; 613#ifdef PNG_FLOATING_POINT_SUPPORTED 614typedef double * * png_doublepp; 615#endif 616 617/* Pointers to pointers to pointers; i.e., pointer to array */ 618typedef char * * * png_charppp; 619 620#endif /* PNG_BUILDING_SYMBOL_TABLE */ 621 622#endif /* PNGCONF_H */ 623