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Carla/source/modules/juce_graphics/image_formats/pnglib/pngpriv.h

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  1. 

  2. /* pngpriv.h - private declarations for use inside libpng

  3.  *

  4.  * Copyright (c) 2018-2019 Cosmin Truta

  5.  * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson

  6.  * Copyright (c) 1996-1997 Andreas Dilger

  7.  * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.

  8.  *

  9.  * This code is released under the libpng license.

  10.  * For conditions of distribution and use, see the disclaimer

  11.  * and license in png.h

  12.  */

  13. 

  14. /* The symbols declared in this file (including the functions declared

  15.  * as extern) are PRIVATE.  They are not part of the libpng public

  16.  * interface, and are not recommended for use by regular applications.

  17.  * Some of them may become public in the future; others may stay private,

  18.  * change in an incompatible way, or even disappear.

  19.  * Although the libpng users are not forbidden to include this header,

  20.  * they should be well aware of the issues that may arise from doing so.

  21.  */

  22. 

  23. #ifndef PNGPRIV_H

  24. #define PNGPRIV_H

  25. 

  26. /* Feature Test Macros.  The following are defined here to ensure that correctly

  27.  * implemented libraries reveal the APIs libpng needs to build and hide those

  28.  * that are not needed and potentially damaging to the compilation.

  29.  *

  30.  * Feature Test Macros must be defined before any system header is included (see

  31.  * POSIX 1003.1 2.8.2 "POSIX Symbols."

  32.  *

  33.  * These macros only have an effect if the operating system supports either

  34.  * POSIX 1003.1 or C99, or both.  On other operating systems (particularly

  35.  * Windows/Visual Studio) there is no effect; the OS specific tests below are

  36.  * still required (as of 2011-05-02.)

  37.  */

  38. #ifndef _POSIX_SOURCE

  39. # define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */

  40. #endif

  41. 

  42. #ifndef PNG_VERSION_INFO_ONLY

  43. /* Standard library headers not required by png.h: */

  44. #  include <stdlib.h>

  45. #  include <string.h>

  46. #endif

  47. 

  48. #define PNGLIB_BUILD /*libpng is being built, not used*/

  49. 

  50. /* If HAVE_CONFIG_H is defined during the build then the build system must

  51.  * provide an appropriate "config.h" file on the include path.  The header file

  52.  * must provide definitions as required below (search for "HAVE_CONFIG_H");

  53.  * see configure.ac for more details of the requirements.  The macro

  54.  * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on

  55.  * 'configure'; define this macro to prevent the configure build including the

  56.  * configure generated config.h.  Libpng is expected to compile without *any*

  57.  * special build system support on a reasonably ANSI-C compliant system.

  58.  */

  59. #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)

  60. #  include <config.h>

  61. 

  62.    /* Pick up the definition of 'restrict' from config.h if it was read: */

  63. #  define PNG_RESTRICT restrict

  64. #endif

  65. 

  66. /* To support symbol prefixing it is necessary to know *before* including png.h

  67.  * whether the fixed point (and maybe other) APIs are exported, because if they

  68.  * are not internal definitions may be required.  This is handled below just

  69.  * before png.h is included, but load the configuration now if it is available.

  70.  */

  71. #ifndef PNGLCONF_H

  72. #  include "pnglibconf.h"

  73. #endif

  74. 

  75. /* Local renames may change non-exported API functions from png.h */

  76. #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H)

  77. #  include "pngprefix.h"

  78. #endif

  79. 

  80. #ifdef PNG_USER_CONFIG

  81. #  include "pngusr.h"

  82.    /* These should have been defined in pngusr.h */

  83. #  ifndef PNG_USER_PRIVATEBUILD

  84. #    define PNG_USER_PRIVATEBUILD "Custom libpng build"

  85. #  endif

  86. #  ifndef PNG_USER_DLLFNAME_POSTFIX

  87. #    define PNG_USER_DLLFNAME_POSTFIX "Cb"

  88. #  endif

  89. #endif

  90. 

  91. /* Compile time options.

  92.  * =====================

  93.  * In a multi-arch build the compiler may compile the code several times for the

  94.  * same object module, producing different binaries for different architectures.

  95.  * When this happens configure-time setting of the target host options cannot be

  96.  * done and this interferes with the handling of the ARM NEON optimizations, and

  97.  * possibly other similar optimizations.  Put additional tests here; in general

  98.  * this is needed when the same option can be changed at both compile time and

  99.  * run time depending on the target OS (i.e. iOS vs Android.)

  100.  *

  101.  * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because

  102.  * this is not possible with certain compilers (Oracle SUN OS CC), as a result

  103.  * it is necessary to ensure that all extern functions that *might* be used

  104.  * regardless of $(CFLAGS) get declared in this file.  The test on __ARM_NEON__

  105.  * below is one example of this behavior because it is controlled by the

  106.  * presence or not of -mfpu=neon on the GCC command line, it is possible to do

  107.  * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely

  108.  * do this.

  109.  */

  110. #ifndef PNG_ARM_NEON_OPT

  111.    /* ARM NEON optimizations are being controlled by the compiler settings,

  112.     * typically the target FPU.  If the FPU has been set to NEON (-mfpu=neon

  113.     * with GCC) then the compiler will define __ARM_NEON__ and we can rely

  114.     * unconditionally on NEON instructions not crashing, otherwise we must

  115.     * disable use of NEON instructions.

  116.     *

  117.     * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they

  118.     * can only be turned on automatically if that is supported too.  If

  119.     * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail

  120.     * to compile with an appropriate #error if ALIGNED_MEMORY has been turned

  121.     * off.

  122.     *

  123.     * Note that gcc-4.9 defines __ARM_NEON instead of the deprecated

  124.     * __ARM_NEON__, so we check both variants.

  125.     *

  126.     * To disable ARM_NEON optimizations entirely, and skip compiling the

  127.     * associated assembler code, pass --enable-arm-neon=no to configure

  128.     * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS.

  129.     */

  130. #  if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \

  131.    defined(PNG_ALIGNED_MEMORY_SUPPORTED)

  132. #     define PNG_ARM_NEON_OPT 2

  133. #  else

  134. #     define PNG_ARM_NEON_OPT 0

  135. #  endif

  136. #endif

  137. 

  138. #if PNG_ARM_NEON_OPT > 0

  139.    /* NEON optimizations are to be at least considered by libpng, so enable the

  140.     * callbacks to do this.

  141.     */

  142. #  define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon

  143. 

  144.    /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used

  145.     * if possible - if __ARM_NEON__ is set and the compiler version is not known

  146.     * to be broken.  This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can

  147.     * be:

  148.     *

  149.     *    1  The intrinsics code (the default with __ARM_NEON__)

  150.     *    2  The hand coded assembler (the default without __ARM_NEON__)

  151.     *

  152.     * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however

  153.     * this is *NOT* supported and may cease to work even after a minor revision

  154.     * to libpng.  It *is* valid to do this for testing purposes, e.g. speed

  155.     * testing or a new compiler, but the results should be communicated to the

  156.     * libpng implementation list for incorporation in the next minor release.

  157.     */

  158. #  ifndef PNG_ARM_NEON_IMPLEMENTATION

  159. #     if defined(__ARM_NEON__) || defined(__ARM_NEON)

  160. #        if defined(__clang__)

  161.             /* At present it is unknown by the libpng developers which versions

  162.              * of clang support the intrinsics, however some or perhaps all

  163.              * versions do not work with the assembler so this may be

  164.              * irrelevant, so just use the default (do nothing here.)

  165.              */

  166. #        elif defined(__GNUC__)

  167.             /* GCC 4.5.4 NEON support is known to be broken.  4.6.3 is known to

  168.              * work, so if this *is* GCC, or G++, look for a version >4.5

  169.              */

  170. #           if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)

  171. #              define PNG_ARM_NEON_IMPLEMENTATION 2

  172. #           endif /* no GNUC support */

  173. #        endif /* __GNUC__ */

  174. #     else /* !defined __ARM_NEON__ */

  175.          /* The 'intrinsics' code simply won't compile without this -mfpu=neon:

  176.           */

  177. #        if !defined(__aarch64__)

  178.             /* The assembler code currently does not work on ARM64 */

  179. #          define PNG_ARM_NEON_IMPLEMENTATION 2

  180. #        endif /* __aarch64__ */

  181. #     endif /* __ARM_NEON__ */

  182. #  endif /* !PNG_ARM_NEON_IMPLEMENTATION */

  183. 

  184. #  ifndef PNG_ARM_NEON_IMPLEMENTATION

  185.       /* Use the intrinsics code by default. */

  186. #     define PNG_ARM_NEON_IMPLEMENTATION 1

  187. #  endif

  188. #endif /* PNG_ARM_NEON_OPT > 0 */

  189. 

  190. #ifndef PNG_MIPS_MSA_OPT

  191. #  if defined(__mips_msa) && (__mips_isa_rev >= 5) && defined(PNG_ALIGNED_MEMORY_SUPPORTED)

  192. #     define PNG_MIPS_MSA_OPT 2

  193. #  else

  194. #     define PNG_MIPS_MSA_OPT 0

  195. #  endif

  196. #endif

  197. 

  198. #ifndef PNG_POWERPC_VSX_OPT

  199. #  if defined(__PPC64__) && defined(__ALTIVEC__) && defined(__VSX__)

  200. #     define PNG_POWERPC_VSX_OPT 2

  201. #  else

  202. #     define PNG_POWERPC_VSX_OPT 0

  203. #  endif

  204. #endif

  205. 

  206. #ifndef PNG_INTEL_SSE_OPT

  207. #   ifdef PNG_INTEL_SSE

  208.       /* Only check for SSE if the build configuration has been modified to

  209.        * enable SSE optimizations.  This means that these optimizations will

  210.        * be off by default.  See contrib/intel for more details.

  211.        */

  212. #     if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \

  213.        defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \

  214.        (defined(_M_IX86_FP) && _M_IX86_FP >= 2)

  215. #         define PNG_INTEL_SSE_OPT 1

  216. #      else

  217. #         define PNG_INTEL_SSE_OPT 0

  218. #      endif

  219. #   else

  220. #      define PNG_INTEL_SSE_OPT 0

  221. #   endif

  222. #endif

  223. 

  224. #if PNG_INTEL_SSE_OPT > 0

  225. #   ifndef PNG_INTEL_SSE_IMPLEMENTATION

  226. #      if defined(__SSE4_1__) || defined(__AVX__)

  227.           /* We are not actually using AVX, but checking for AVX is the best

  228.              way we can detect SSE4.1 and SSSE3 on MSVC.

  229.           */

  230. #         define PNG_INTEL_SSE_IMPLEMENTATION 3

  231. #      elif defined(__SSSE3__)

  232. #         define PNG_INTEL_SSE_IMPLEMENTATION 2

  233. #      elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \

  234.        (defined(_M_IX86_FP) && _M_IX86_FP >= 2)

  235. #         define PNG_INTEL_SSE_IMPLEMENTATION 1

  236. #      else

  237. #         define PNG_INTEL_SSE_IMPLEMENTATION 0

  238. #      endif

  239. #   endif

  240. 

  241. #   if PNG_INTEL_SSE_IMPLEMENTATION > 0

  242. #      define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2

  243. #   endif

  244. #else

  245. #   define PNG_INTEL_SSE_IMPLEMENTATION 0

  246. #endif

  247. 

  248. #if PNG_MIPS_MSA_OPT > 0

  249. #  define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_msa

  250. #  ifndef PNG_MIPS_MSA_IMPLEMENTATION

  251. #     if defined(__mips_msa)

  252. #        if defined(__clang__)

  253. #        elif defined(__GNUC__)

  254. #           if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)

  255. #              define PNG_MIPS_MSA_IMPLEMENTATION 2

  256. #           endif /* no GNUC support */

  257. #        endif /* __GNUC__ */

  258. #     else /* !defined __mips_msa */

  259. #        define PNG_MIPS_MSA_IMPLEMENTATION 2

  260. #     endif /* __mips_msa */

  261. #  endif /* !PNG_MIPS_MSA_IMPLEMENTATION */

  262. 

  263. #  ifndef PNG_MIPS_MSA_IMPLEMENTATION

  264. #     define PNG_MIPS_MSA_IMPLEMENTATION 1

  265. #  endif

  266. #endif /* PNG_MIPS_MSA_OPT > 0 */

  267. 

  268. #if PNG_POWERPC_VSX_OPT > 0

  269. #  define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_vsx

  270. #  define PNG_POWERPC_VSX_IMPLEMENTATION 1

  271. #endif

  272. 

  273. 

  274. /* Is this a build of a DLL where compilation of the object modules requires

  275.  * different preprocessor settings to those required for a simple library?  If

  276.  * so PNG_BUILD_DLL must be set.

  277.  *

  278.  * If libpng is used inside a DLL but that DLL does not export the libpng APIs

  279.  * PNG_BUILD_DLL must not be set.  To avoid the code below kicking in build a

  280.  * static library of libpng then link the DLL against that.

  281.  */

  282. #ifndef PNG_BUILD_DLL

  283. #  ifdef DLL_EXPORT

  284.       /* This is set by libtool when files are compiled for a DLL; libtool

  285.        * always compiles twice, even on systems where it isn't necessary.  Set

  286.        * PNG_BUILD_DLL in case it is necessary:

  287.        */

  288. #     define PNG_BUILD_DLL

  289. #  else

  290. #     ifdef _WINDLL

  291.          /* This is set by the Microsoft Visual Studio IDE in projects that

  292.           * build a DLL.  It can't easily be removed from those projects (it

  293.           * isn't visible in the Visual Studio UI) so it is a fairly reliable

  294.           * indication that PNG_IMPEXP needs to be set to the DLL export

  295.           * attributes.

  296.           */

  297. #        define PNG_BUILD_DLL

  298. #     else

  299. #        ifdef __DLL__

  300.             /* This is set by the Borland C system when compiling for a DLL

  301.              * (as above.)

  302.              */

  303. #           define PNG_BUILD_DLL

  304. #        else

  305.             /* Add additional compiler cases here. */

  306. #        endif

  307. #     endif

  308. #  endif

  309. #endif /* Setting PNG_BUILD_DLL if required */

  310. 

  311. /* See pngconf.h for more details: the builder of the library may set this on

  312.  * the command line to the right thing for the specific compilation system or it

  313.  * may be automagically set above (at present we know of no system where it does

  314.  * need to be set on the command line.)

  315.  *

  316.  * PNG_IMPEXP must be set here when building the library to prevent pngconf.h

  317.  * setting it to the "import" setting for a DLL build.

  318.  */

  319. #ifndef PNG_IMPEXP

  320. #  ifdef PNG_BUILD_DLL

  321. #     define PNG_IMPEXP PNG_DLL_EXPORT

  322. #  else

  323.       /* Not building a DLL, or the DLL doesn't require specific export

  324.        * definitions.

  325.        */

  326. #     define PNG_IMPEXP

  327. #  endif

  328. #endif

  329. 

  330. /* No warnings for private or deprecated functions in the build: */

  331. #ifndef PNG_DEPRECATED

  332. #  define PNG_DEPRECATED

  333. #endif

  334. #ifndef PNG_PRIVATE

  335. #  define PNG_PRIVATE

  336. #endif

  337. 

  338. /* Symbol preprocessing support.

  339.  *

  340.  * To enable listing global, but internal, symbols the following macros should

  341.  * always be used to declare an extern data or function object in this file.

  342.  */

  343. #ifndef PNG_INTERNAL_DATA

  344. #  define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array

  345. #endif

  346. 

  347. #ifndef PNG_INTERNAL_FUNCTION

  348. #  define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\

  349.       PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)

  350. #endif

  351. 

  352. #ifndef PNG_INTERNAL_CALLBACK

  353. #  define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\

  354.       PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\

  355.          PNG_EMPTY attributes)

  356. #endif

  357. 

  358. /* If floating or fixed point APIs are disabled they may still be compiled

  359.  * internally.  To handle this make sure they are declared as the appropriate

  360.  * internal extern function (otherwise the symbol prefixing stuff won't work and

  361.  * the functions will be used without definitions.)

  362.  *

  363.  * NOTE: although all the API functions are declared here they are not all

  364.  * actually built!  Because the declarations are still made it is necessary to

  365.  * fake out types that they depend on.

  366.  */

  367. #ifndef PNG_FP_EXPORT

  368. #  ifndef PNG_FLOATING_POINT_SUPPORTED

  369. #     define PNG_FP_EXPORT(ordinal, type, name, args)\

  370.          PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);

  371. #     ifndef PNG_VERSION_INFO_ONLY

  372.          typedef struct png_incomplete png_double;

  373.          typedef png_double*           png_doublep;

  374.          typedef const png_double*     png_const_doublep;

  375.          typedef png_double**          png_doublepp;

  376. #     endif

  377. #  endif

  378. #endif

  379. #ifndef PNG_FIXED_EXPORT

  380. #  ifndef PNG_FIXED_POINT_SUPPORTED

  381. #     define PNG_FIXED_EXPORT(ordinal, type, name, args)\

  382.          PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);

  383. #  endif

  384. #endif

  385. 

  386. #include "png.h"

  387. 

  388. /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */

  389. #ifndef PNG_DLL_EXPORT

  390. #  define PNG_DLL_EXPORT

  391. #endif

  392. 

  393. /* This is a global switch to set the compilation for an installed system

  394.  * (a release build).  It can be set for testing debug builds to ensure that

  395.  * they will compile when the build type is switched to RC or STABLE, the

  396.  * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE.  Set this in CPPFLAGS

  397.  * with either:

  398.  *

  399.  *   -DPNG_RELEASE_BUILD Turns on the release compile path

  400.  *   -DPNG_RELEASE_BUILD=0 Turns it off

  401.  * or in your pngusr.h with

  402.  *   #define PNG_RELEASE_BUILD=1 Turns on the release compile path

  403.  *   #define PNG_RELEASE_BUILD=0 Turns it off

  404.  */

  405. #ifndef PNG_RELEASE_BUILD

  406. #  define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC)

  407. #endif

  408. 

  409. /* SECURITY and SAFETY:

  410.  *

  411.  * libpng is built with support for internal limits on image dimensions and

  412.  * memory usage.  These are documented in scripts/pnglibconf.dfa of the

  413.  * source and recorded in the machine generated header file pnglibconf.h.

  414.  */

  415. 

  416. /* If you are running on a machine where you cannot allocate more

  417.  * than 64K of memory at once, uncomment this.  While libpng will not

  418.  * normally need that much memory in a chunk (unless you load up a very

  419.  * large file), zlib needs to know how big of a chunk it can use, and

  420.  * libpng thus makes sure to check any memory allocation to verify it

  421.  * will fit into memory.

  422.  *

  423.  * zlib provides 'MAXSEG_64K' which, if defined, indicates the

  424.  * same limit and pngconf.h (already included) sets the limit

  425.  * if certain operating systems are detected.

  426.  */

  427. #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)

  428. #  define PNG_MAX_MALLOC_64K

  429. #endif

  430. 

  431. #ifndef PNG_UNUSED

  432. /* Unused formal parameter warnings are silenced using the following macro

  433.  * which is expected to have no bad effects on performance (optimizing

  434.  * compilers will probably remove it entirely).  Note that if you replace

  435.  * it with something other than whitespace, you must include the terminating

  436.  * semicolon.

  437.  */

  438. #  define PNG_UNUSED(param) (void)param;

  439. #endif

  440. 

  441. /* Just a little check that someone hasn't tried to define something

  442.  * contradictory.

  443.  */

  444. #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)

  445. #  undef PNG_ZBUF_SIZE

  446. #  define PNG_ZBUF_SIZE 65536L

  447. #endif

  448. 

  449. /* If warnings or errors are turned off the code is disabled or redirected here.

  450.  * From 1.5.4 functions have been added to allow very limited formatting of

  451.  * error and warning messages - this code will also be disabled here.

  452.  */

  453. #ifdef PNG_WARNINGS_SUPPORTED

  454. #  define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;

  455. #else

  456. #  define png_warning_parameter(p,number,string) ((void)0)

  457. #  define png_warning_parameter_unsigned(p,number,format,value) ((void)0)

  458. #  define png_warning_parameter_signed(p,number,format,value) ((void)0)

  459. #  define png_formatted_warning(pp,p,message) ((void)(pp))

  460. #  define PNG_WARNING_PARAMETERS(p)

  461. #endif

  462. #ifndef PNG_ERROR_TEXT_SUPPORTED

  463. #  define png_fixed_error(s1,s2) png_err(s1)

  464. #endif

  465. 

  466. /* Some fixed point APIs are still required even if not exported because

  467.  * they get used by the corresponding floating point APIs.  This magic

  468.  * deals with this:

  469.  */

  470. #ifdef PNG_FIXED_POINT_SUPPORTED

  471. #  define PNGFAPI PNGAPI

  472. #else

  473. #  define PNGFAPI /* PRIVATE */

  474. #endif

  475. 

  476. #ifndef PNG_VERSION_INFO_ONLY

  477. /* Other defines specific to compilers can go here.  Try to keep

  478.  * them inside an appropriate ifdef/endif pair for portability.

  479.  */

  480. 

  481. /* C allows up-casts from (void*) to any pointer and (const void*) to any

  482.  * pointer to a const object.  C++ regards this as a type error and requires an

  483.  * explicit, static, cast and provides the static_cast<> rune to ensure that

  484.  * const is not cast away.

  485.  */

  486. #ifdef __cplusplus

  487. #  define png_voidcast(type, value) static_cast<type>(value)

  488. #  define png_constcast(type, value) const_cast<type>(value)

  489. #  define png_aligncast(type, value) \

  490.    static_cast<type>(static_cast<void*>(value))

  491. #  define png_aligncastconst(type, value) \

  492.    static_cast<type>(static_cast<const void*>(value))

  493. #else

  494. #  define png_voidcast(type, value) (value)

  495. #  ifdef _WIN64

  496. #     ifdef __GNUC__

  497.          typedef unsigned long long png_ptruint;

  498. #     else

  499.          typedef unsigned __int64 png_ptruint;

  500. #     endif

  501. #  else

  502.       typedef unsigned long png_ptruint;

  503. #  endif

  504. #  define png_constcast(type, value) ((type)(png_ptruint)(const void*)(value))

  505. #  define png_aligncast(type, value) ((void*)(value))

  506. #  define png_aligncastconst(type, value) ((const void*)(value))

  507. #endif /* __cplusplus */

  508. 

  509. #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\

  510.     defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)

  511.    /* png.c requires the following ANSI-C constants if the conversion of

  512.     * floating point to ASCII is implemented therein:

  513.     *

  514.     *  DBL_DIG  Maximum number of decimal digits (can be set to any constant)

  515.     *  DBL_MIN  Smallest normalized fp number (can be set to an arbitrary value)

  516.     *  DBL_MAX  Maximum floating point number (can be set to an arbitrary value)

  517.     */

  518. #  include <float.h>

  519. 

  520. #  if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \

  521.     defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)

  522.    /* We need to check that <math.h> hasn't already been included earlier

  523.     * as it seems it doesn't agree with <fp.h>, yet we should really use

  524.     * <fp.h> if possible.

  525.     */

  526. #    if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)

  527. #      include <fp.h>

  528. #    endif

  529. #  else

  530. #    include <math.h>

  531. #  endif

  532. #  if defined(_AMIGA) && defined(__SASC) && defined(_M68881)

  533.    /* Amiga SAS/C: We must include builtin FPU functions when compiling using

  534.     * MATH=68881

  535.     */

  536. #    include <m68881.h>

  537. #  endif

  538. #endif

  539. 

  540. /* This provides the non-ANSI (far) memory allocation routines. */

  541. #if defined(__TURBOC__) && defined(__MSDOS__)

  542. #  include <mem.h>

  543. #  include <alloc.h>

  544. #endif

  545. 

  546. #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \

  547.     defined(_WIN32) || defined(__WIN32__)

  548. #  include <windows.h>  /* defines _WINDOWS_ macro */

  549. #endif

  550. #endif /* PNG_VERSION_INFO_ONLY */

  551. 

  552. /* Moved here around 1.5.0beta36 from pngconf.h */

  553. /* Users may want to use these so they are not private.  Any library

  554.  * functions that are passed far data must be model-independent.

  555.  */

  556. 

  557. /* Memory model/platform independent fns */

  558. #ifndef PNG_ABORT

  559. #  ifdef _WINDOWS_

  560. #    define PNG_ABORT() ExitProcess(0)

  561. #  else

  562. #    define PNG_ABORT() abort()

  563. #  endif

  564. #endif

  565. 

  566. /* These macros may need to be architecture dependent. */

  567. #define PNG_ALIGN_NONE   0 /* do not use data alignment */

  568. #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */

  569. #ifdef offsetof

  570. #  define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */

  571. #else

  572. #  define PNG_ALIGN_OFFSET -1 /* prevent the use of this */

  573. #endif

  574. #define PNG_ALIGN_SIZE   3 /* use sizeof to determine alignment */

  575. 

  576. #ifndef PNG_ALIGN_TYPE

  577.    /* Default to using aligned access optimizations and requiring alignment to a

  578.     * multiple of the data type size.  Override in a compiler specific fashion

  579.     * if necessary by inserting tests here:

  580.     */

  581. #  define PNG_ALIGN_TYPE PNG_ALIGN_SIZE

  582. #endif

  583. 

  584. #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE

  585.    /* This is used because in some compiler implementations non-aligned

  586.     * structure members are supported, so the offsetof approach below fails.

  587.     * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access

  588.     * is good for performance.  Do not do this unless you have tested the result

  589.     * and understand it.

  590.     */

  591. #  define png_alignof(type) (sizeof (type))

  592. #else

  593. #  if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET

  594. #     define png_alignof(type) offsetof(struct{char c; type t;}, t)

  595. #  else

  596. #     if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS

  597. #        define png_alignof(type) (1)

  598. #     endif

  599.       /* Else leave png_alignof undefined to prevent use thereof */

  600. #  endif

  601. #endif

  602. 

  603. /* This implicitly assumes alignment is always to a power of 2. */

  604. #ifdef png_alignof

  605. #  define png_isaligned(ptr, type)\

  606.    (((type)((const char*)ptr-(const char*)0) & \

  607.    (type)(png_alignof(type)-1)) == 0)

  608. #else

  609. #  define png_isaligned(ptr, type) 0

  610. #endif

  611. 

  612. /* End of memory model/platform independent support */

  613. /* End of 1.5.0beta36 move from pngconf.h */

  614. 

  615. /* CONSTANTS and UTILITY MACROS

  616.  * These are used internally by libpng and not exposed in the API

  617.  */

  618. 

  619. /* Various modes of operation.  Note that after an init, mode is set to

  620.  * zero automatically when the structure is created.  Three of these

  621.  * are defined in png.h because they need to be visible to applications

  622.  * that call png_set_unknown_chunk().

  623.  */

  624. /* #define PNG_HAVE_IHDR            0x01U (defined in png.h) */

  625. /* #define PNG_HAVE_PLTE            0x02U (defined in png.h) */

  626. #define PNG_HAVE_IDAT               0x04U

  627. /* #define PNG_AFTER_IDAT           0x08U (defined in png.h) */

  628. #define PNG_HAVE_IEND               0x10U

  629.                    /*               0x20U (unused) */

  630.                    /*               0x40U (unused) */

  631.                    /*               0x80U (unused) */

  632. #define PNG_HAVE_CHUNK_HEADER      0x100U

  633. #define PNG_WROTE_tIME             0x200U

  634. #define PNG_WROTE_INFO_BEFORE_PLTE 0x400U

  635. #define PNG_BACKGROUND_IS_GRAY     0x800U

  636. #define PNG_HAVE_PNG_SIGNATURE    0x1000U

  637. #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000U /* Have another chunk after IDAT */

  638.                    /*             0x4000U (unused) */

  639. #define PNG_IS_READ_STRUCT        0x8000U /* Else is a write struct */

  640. 

  641. /* Flags for the transformations the PNG library does on the image data */

  642. #define PNG_BGR                 0x0001U

  643. #define PNG_INTERLACE           0x0002U

  644. #define PNG_PACK                0x0004U

  645. #define PNG_SHIFT               0x0008U

  646. #define PNG_SWAP_BYTES          0x0010U

  647. #define PNG_INVERT_MONO         0x0020U

  648. #define PNG_QUANTIZE            0x0040U

  649. #define PNG_COMPOSE             0x0080U    /* Was PNG_BACKGROUND */

  650. #define PNG_BACKGROUND_EXPAND   0x0100U

  651. #define PNG_EXPAND_16           0x0200U    /* Added to libpng 1.5.2 */

  652. #define PNG_16_TO_8             0x0400U    /* Becomes 'chop' in 1.5.4 */

  653. #define PNG_RGBA                0x0800U

  654. #define PNG_EXPAND              0x1000U

  655. #define PNG_GAMMA               0x2000U

  656. #define PNG_GRAY_TO_RGB         0x4000U

  657. #define PNG_FILLER              0x8000U

  658. #define PNG_PACKSWAP           0x10000U

  659. #define PNG_SWAP_ALPHA         0x20000U

  660. #define PNG_STRIP_ALPHA        0x40000U

  661. #define PNG_INVERT_ALPHA       0x80000U

  662. #define PNG_USER_TRANSFORM    0x100000U

  663. #define PNG_RGB_TO_GRAY_ERR   0x200000U

  664. #define PNG_RGB_TO_GRAY_WARN  0x400000U

  665. #define PNG_RGB_TO_GRAY       0x600000U /* two bits, RGB_TO_GRAY_ERR|WARN */

  666. #define PNG_ENCODE_ALPHA      0x800000U /* Added to libpng-1.5.4 */

  667. #define PNG_ADD_ALPHA        0x1000000U /* Added to libpng-1.2.7 */

  668. #define PNG_EXPAND_tRNS      0x2000000U /* Added to libpng-1.2.9 */

  669. #define PNG_SCALE_16_TO_8    0x4000000U /* Added to libpng-1.5.4 */

  670.                        /*    0x8000000U unused */

  671.                        /*   0x10000000U unused */

  672.                        /*   0x20000000U unused */

  673.                        /*   0x40000000U unused */

  674. /* Flags for png_create_struct */

  675. #define PNG_STRUCT_PNG   0x0001U

  676. #define PNG_STRUCT_INFO  0x0002U

  677. 

  678. /* Flags for the png_ptr->flags rather than declaring a byte for each one */

  679. #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001U

  680. #define PNG_FLAG_ZSTREAM_INITIALIZED      0x0002U /* Added to libpng-1.6.0 */

  681.                                   /*      0x0004U    unused */

  682. #define PNG_FLAG_ZSTREAM_ENDED            0x0008U /* Added to libpng-1.6.0 */

  683.                                   /*      0x0010U    unused */

  684.                                   /*      0x0020U    unused */

  685. #define PNG_FLAG_ROW_INIT                 0x0040U

  686. #define PNG_FLAG_FILLER_AFTER             0x0080U

  687. #define PNG_FLAG_CRC_ANCILLARY_USE        0x0100U

  688. #define PNG_FLAG_CRC_ANCILLARY_NOWARN     0x0200U

  689. #define PNG_FLAG_CRC_CRITICAL_USE         0x0400U

  690. #define PNG_FLAG_CRC_CRITICAL_IGNORE      0x0800U

  691. #define PNG_FLAG_ASSUME_sRGB              0x1000U /* Added to libpng-1.5.4 */

  692. #define PNG_FLAG_OPTIMIZE_ALPHA           0x2000U /* Added to libpng-1.5.4 */

  693. #define PNG_FLAG_DETECT_UNINITIALIZED     0x4000U /* Added to libpng-1.5.4 */

  694. /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS      0x8000U */

  695. /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS      0x10000U */

  696. #define PNG_FLAG_LIBRARY_MISMATCH        0x20000U

  697. #define PNG_FLAG_STRIP_ERROR_NUMBERS     0x40000U

  698. #define PNG_FLAG_STRIP_ERROR_TEXT        0x80000U

  699. #define PNG_FLAG_BENIGN_ERRORS_WARN     0x100000U /* Added to libpng-1.4.0 */

  700. #define PNG_FLAG_APP_WARNINGS_WARN      0x200000U /* Added to libpng-1.6.0 */

  701. #define PNG_FLAG_APP_ERRORS_WARN        0x400000U /* Added to libpng-1.6.0 */

  702.                                   /*    0x800000U    unused */

  703.                                   /*   0x1000000U    unused */

  704.                                   /*   0x2000000U    unused */

  705.                                   /*   0x4000000U    unused */

  706.                                   /*   0x8000000U    unused */

  707.                                   /*  0x10000000U    unused */

  708.                                   /*  0x20000000U    unused */

  709.                                   /*  0x40000000U    unused */

  710. 

  711. #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \

  712.                                      PNG_FLAG_CRC_ANCILLARY_NOWARN)

  713. 

  714. #define PNG_FLAG_CRC_CRITICAL_MASK  (PNG_FLAG_CRC_CRITICAL_USE | \

  715.                                      PNG_FLAG_CRC_CRITICAL_IGNORE)

  716. 

  717. #define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \

  718.                                      PNG_FLAG_CRC_CRITICAL_MASK)

  719. 

  720. /* Save typing and make code easier to understand */

  721. 

  722. #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \

  723.    abs((int)((c1).green) - (int)((c2).green)) + \

  724.    abs((int)((c1).blue) - (int)((c2).blue)))

  725. 

  726. /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255

  727.  * by dividing by 257 *with rounding*.  This macro is exact for the given range.

  728.  * See the discourse in pngrtran.c png_do_scale_16_to_8.  The values in the

  729.  * macro were established by experiment (modifying the added value).  The macro

  730.  * has a second variant that takes a value already scaled by 255 and divides by

  731.  * 65535 - this has a maximum error of .502.  Over the range 0..65535*65535 it

  732.  * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.

  733.  */

  734. #define PNG_DIV65535(v24) (((v24) + 32895) >> 16)

  735. #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)

  736. 

  737. /* Added to libpng-1.2.6 JB */

  738. #define PNG_ROWBYTES(pixel_bits, width) \

  739.     ((pixel_bits) >= 8 ? \

  740.     ((size_t)(width) * (((size_t)(pixel_bits)) >> 3)) : \

  741.     (( ((size_t)(width) * ((size_t)(pixel_bits))) + 7) >> 3) )

  742. 

  743. /* This returns the number of trailing bits in the last byte of a row, 0 if the

  744.  * last byte is completely full of pixels.  It is, in principle, (pixel_bits x

  745.  * width) % 8, but that would overflow for large 'width'.  The second macro is

  746.  * the same except that it returns the number of unused bits in the last byte;

  747.  * (8-TRAILBITS), but 0 when TRAILBITS is 0.

  748.  *

  749.  * NOTE: these macros are intended to be self-evidently correct and never

  750.  * overflow on the assumption that pixel_bits is in the range 0..255.  The

  751.  * arguments are evaluated only once and they can be signed (e.g. as a result of

  752.  * the integral promotions).  The result of the expression always has type

  753.  * (png_uint_32), however the compiler always knows it is in the range 0..7.

  754.  */

  755. #define PNG_TRAILBITS(pixel_bits, width) \

  756.     (((pixel_bits) * ((width) % (png_uint_32)8)) % 8)

  757. 

  758. #define PNG_PADBITS(pixel_bits, width) \

  759.     ((8 - PNG_TRAILBITS(pixel_bits, width)) % 8)

  760. 

  761. /* PNG_OUT_OF_RANGE returns true if value is outside the range

  762.  * ideal-delta..ideal+delta.  Each argument is evaluated twice.

  763.  * "ideal" and "delta" should be constants, normally simple

  764.  * integers, "value" a variable. Added to libpng-1.2.6 JB

  765.  */

  766. #define PNG_OUT_OF_RANGE(value, ideal, delta) \

  767.    ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )

  768. 

  769. /* Conversions between fixed and floating point, only defined if

  770.  * required (to make sure the code doesn't accidentally use float

  771.  * when it is supposedly disabled.)

  772.  */

  773. #ifdef PNG_FLOATING_POINT_SUPPORTED

  774. /* The floating point conversion can't overflow, though it can and

  775.  * does lose accuracy relative to the original fixed point value.

  776.  * In practice this doesn't matter because png_fixed_point only

  777.  * stores numbers with very low precision.  The png_ptr and s

  778.  * arguments are unused by default but are there in case error

  779.  * checking becomes a requirement.

  780.  */

  781. #define png_float(png_ptr, fixed, s) (.00001 * (fixed))

  782. 

  783. /* The fixed point conversion performs range checking and evaluates

  784.  * its argument multiple times, so must be used with care.  The

  785.  * range checking uses the PNG specification values for a signed

  786.  * 32-bit fixed point value except that the values are deliberately

  787.  * rounded-to-zero to an integral value - 21474 (21474.83 is roughly

  788.  * (2^31-1) * 100000). 's' is a string that describes the value being

  789.  * converted.

  790.  *

  791.  * NOTE: this macro will raise a png_error if the range check fails,

  792.  * therefore it is normally only appropriate to use this on values

  793.  * that come from API calls or other sources where an out of range

  794.  * error indicates a programming error, not a data error!

  795.  *

  796.  * NOTE: by default this is off - the macro is not used - because the

  797.  * function call saves a lot of code.

  798.  */

  799. #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED

  800. #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\

  801.     ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))

  802. #endif

  803. /* else the corresponding function is defined below, inside the scope of the

  804.  * cplusplus test.

  805.  */

  806. #endif

  807. 

  808. /* Constants for known chunk types.  If you need to add a chunk, define the name

  809.  * here.  For historical reasons these constants have the form png_<name>; i.e.

  810.  * the prefix is lower case.  Please use decimal values as the parameters to

  811.  * match the ISO PNG specification and to avoid relying on the C locale

  812.  * interpretation of character values.

  813.  *

  814.  * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values

  815.  * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string

  816.  * to be generated if required.

  817.  *

  818.  * PNG_32b correctly produces a value shifted by up to 24 bits, even on

  819.  * architectures where (int) is only 16 bits.

  820.  */

  821. #define PNG_32b(b,s) ((png_uint_32)(b) << (s))

  822. #define PNG_U32(b1,b2,b3,b4) \

  823.    (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))

  824. 

  825. /* Constants for known chunk types.

  826.  *

  827.  * MAINTAINERS: If you need to add a chunk, define the name here.

  828.  * For historical reasons these constants have the form png_<name>; i.e.

  829.  * the prefix is lower case.  Please use decimal values as the parameters to

  830.  * match the ISO PNG specification and to avoid relying on the C locale

  831.  * interpretation of character values.  Please keep the list sorted.

  832.  *

  833.  * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk

  834.  * type.  In fact the specification does not express chunk types this way,

  835.  * however using a 32-bit value means that the chunk type can be read from the

  836.  * stream using exactly the same code as used for a 32-bit unsigned value and

  837.  * can be examined far more efficiently (using one arithmetic compare).

  838.  *

  839.  * Prior to 1.5.6 the chunk type constants were expressed as C strings.  The

  840.  * libpng API still uses strings for 'unknown' chunks and a macro,

  841.  * PNG_STRING_FROM_CHUNK, allows a string to be generated if required.  Notice

  842.  * that for portable code numeric values must still be used; the string "IHDR"

  843.  * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').

  844.  *

  845.  * In 1.7.0 the definitions will be made public in png.h to avoid having to

  846.  * duplicate the same definitions in application code.

  847.  */

  848. #define png_IDAT PNG_U32( 73,  68,  65,  84)

  849. #define png_IEND PNG_U32( 73,  69,  78,  68)

  850. #define png_IHDR PNG_U32( 73,  72,  68,  82)

  851. #define png_PLTE PNG_U32( 80,  76,  84,  69)

  852. #define png_bKGD PNG_U32( 98,  75,  71,  68)

  853. #define png_cHRM PNG_U32( 99,  72,  82,  77)

  854. #define png_eXIf PNG_U32(101,  88,  73, 102) /* registered July 2017 */

  855. #define png_fRAc PNG_U32(102,  82,  65,  99) /* registered, not defined */

  856. #define png_gAMA PNG_U32(103,  65,  77,  65)

  857. #define png_gIFg PNG_U32(103,  73,  70, 103)

  858. #define png_gIFt PNG_U32(103,  73,  70, 116) /* deprecated */

  859. #define png_gIFx PNG_U32(103,  73,  70, 120)

  860. #define png_hIST PNG_U32(104,  73,  83,  84)

  861. #define png_iCCP PNG_U32(105,  67,  67,  80)

  862. #define png_iTXt PNG_U32(105,  84,  88, 116)

  863. #define png_oFFs PNG_U32(111,  70,  70, 115)

  864. #define png_pCAL PNG_U32(112,  67,  65,  76)

  865. #define png_pHYs PNG_U32(112,  72,  89, 115)

  866. #define png_sBIT PNG_U32(115,  66,  73,  84)

  867. #define png_sCAL PNG_U32(115,  67,  65,  76)

  868. #define png_sPLT PNG_U32(115,  80,  76,  84)

  869. #define png_sRGB PNG_U32(115,  82,  71,  66)

  870. #define png_sTER PNG_U32(115,  84,  69,  82)

  871. #define png_tEXt PNG_U32(116,  69,  88, 116)

  872. #define png_tIME PNG_U32(116,  73,  77,  69)

  873. #define png_tRNS PNG_U32(116,  82,  78,  83)

  874. #define png_zTXt PNG_U32(122,  84,  88, 116)

  875. 

  876. /* The following will work on (signed char*) strings, whereas the get_uint_32

  877.  * macro will fail on top-bit-set values because of the sign extension.

  878.  */

  879. #define PNG_CHUNK_FROM_STRING(s)\

  880.    PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3])

  881. 

  882. /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is

  883.  * signed and the argument is a (char[])  This macro will fail miserably on

  884.  * systems where (char) is more than 8 bits.

  885.  */

  886. #define PNG_STRING_FROM_CHUNK(s,c)\

  887.    (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \

  888.    ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\

  889.    ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \

  890.    ((char*)(s))[3]=(char)((c & 0xff)))

  891. 

  892. /* Do the same but terminate with a null character. */

  893. #define PNG_CSTRING_FROM_CHUNK(s,c)\

  894.    (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)

  895. 

  896. /* Test on flag values as defined in the spec (section 5.4): */

  897. #define PNG_CHUNK_ANCILLARY(c)   (1 & ((c) >> 29))

  898. #define PNG_CHUNK_CRITICAL(c)     (!PNG_CHUNK_ANCILLARY(c))

  899. #define PNG_CHUNK_PRIVATE(c)      (1 & ((c) >> 21))

  900. #define PNG_CHUNK_RESERVED(c)     (1 & ((c) >> 13))

  901. #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >>  5))

  902. 

  903. /* Gamma values (new at libpng-1.5.4): */

  904. #define PNG_GAMMA_MAC_OLD 151724  /* Assume '1.8' is really 2.2/1.45! */

  905. #define PNG_GAMMA_MAC_INVERSE 65909

  906. #define PNG_GAMMA_sRGB_INVERSE 45455

  907. 

  908. /* Almost everything below is C specific; the #defines above can be used in

  909.  * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.

  910.  */

  911. #ifndef PNG_VERSION_INFO_ONLY

  912. 

  913. #include "pngstruct.h"

  914. #include "pnginfo.h"

  915. 

  916. /* Validate the include paths - the include path used to generate pnglibconf.h

  917.  * must match that used in the build, or we must be using pnglibconf.h.prebuilt:

  918.  */

  919. #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM

  920. #  error ZLIB_VERNUM != PNG_ZLIB_VERNUM \

  921.       "-I (include path) error: see the notes in pngpriv.h"

  922.    /* This means that when pnglibconf.h was built the copy of zlib.h that it

  923.     * used is not the same as the one being used here.  Because the build of

  924.     * libpng makes decisions to use inflateInit2 and inflateReset2 based on the

  925.     * zlib version number and because this affects handling of certain broken

  926.     * PNG files the -I directives must match.

  927.     *

  928.     * The most likely explanation is that you passed a -I in CFLAGS. This will

  929.     * not work; all the preprocessor directives and in particular all the -I

  930.     * directives must be in CPPFLAGS.

  931.     */

  932. #endif

  933. 

  934. /* This is used for 16-bit gamma tables -- only the top level pointers are

  935.  * const; this could be changed:

  936.  */

  937. typedef const png_uint_16p * png_const_uint_16pp;

  938. 

  939. /* Added to libpng-1.5.7: sRGB conversion tables */

  940. #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\

  941.    defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)

  942. #ifdef PNG_SIMPLIFIED_READ_SUPPORTED

  943. PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);

  944.    /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,

  945.     * 0..65535.  This table gives the closest 16-bit answers (no errors).

  946.     */

  947. #endif

  948. 

  949. PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);

  950. PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);

  951. 

  952. #define PNG_sRGB_FROM_LINEAR(linear) \

  953.   ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \

  954.    + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)))

  955.    /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB

  956.     * encoded value with maximum error 0.646365.  Note that the input is not a

  957.     * 16-bit value; it has been multiplied by 255! */

  958. #endif /* SIMPLIFIED_READ/WRITE */

  959. 

  960. 

  961. // JUCE CHANGE STARTS HERE

  962. ///* Inhibit C++ name-mangling for libpng functions but not for system calls. */

  963. //#ifdef __cplusplus

  964. //extern "C" {

  965. //#endif /* __cplusplus */

  966. // JUCE CHANGE ENDS HERE

  967. 

  968. /* Internal functions; these are not exported from a DLL however because they

  969.  * are used within several of the C source files they have to be C extern.

  970.  *

  971.  * All of these functions must be declared with PNG_INTERNAL_FUNCTION.

  972.  */

  973. 

  974. /* Zlib support */

  975. #define PNG_UNEXPECTED_ZLIB_RETURN (-7)

  976. PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),

  977.    PNG_EMPTY);

  978.    /* Used by the zlib handling functions to ensure that z_stream::msg is always

  979.     * set before they return.

  980.     */

  981. 

  982. #ifdef PNG_WRITE_SUPPORTED

  983. PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,

  984.    png_compression_bufferp *list),PNG_EMPTY);

  985.    /* Free the buffer list used by the compressed write code. */

  986. #endif

  987. 

  988. #if defined(PNG_FLOATING_POINT_SUPPORTED) && \

  989.    !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \

  990.    (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \

  991.    defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \

  992.    defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \

  993.    (defined(PNG_sCAL_SUPPORTED) && \

  994.    defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))

  995. PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,

  996.    double fp, png_const_charp text),PNG_EMPTY);

  997. #endif

  998. 

  999. /* Check the user version string for compatibility, returns false if the version

  1000.  * numbers aren't compatible.

  1001.  */

  1002. PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,

  1003.    png_const_charp user_png_ver),PNG_EMPTY);

  1004. 

  1005. /* Internal base allocator - no messages, NULL on failure to allocate.  This

  1006.  * does, however, call the application provided allocator and that could call

  1007.  * png_error (although that would be a bug in the application implementation.)

  1008.  */

  1009. PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,

  1010.    png_alloc_size_t size),PNG_ALLOCATED);

  1011. 

  1012. #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\

  1013.    defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)

  1014. /* Internal array allocator, outputs no error or warning messages on failure,

  1015.  * just returns NULL.

  1016.  */

  1017. PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,

  1018.    int nelements, size_t element_size),PNG_ALLOCATED);

  1019. 

  1020. /* The same but an existing array is extended by add_elements.  This function

  1021.  * also memsets the new elements to 0 and copies the old elements.  The old

  1022.  * array is not freed or altered.

  1023.  */

  1024. PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,

  1025.    png_const_voidp array, int old_elements, int add_elements,

  1026.    size_t element_size),PNG_ALLOCATED);

  1027. #endif /* text, sPLT or unknown chunks */

  1028. 

  1029. /* Magic to create a struct when there is no struct to call the user supplied

  1030.  * memory allocators.  Because error handling has not been set up the memory

  1031.  * handlers can't safely call png_error, but this is an obscure and undocumented

  1032.  * restriction so libpng has to assume that the 'free' handler, at least, might

  1033.  * call png_error.

  1034.  */

  1035. PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,

  1036.    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,

  1037.     png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,

  1038.     png_free_ptr free_fn),PNG_ALLOCATED);

  1039. 

  1040. /* Free memory from internal libpng struct */

  1041. PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),

  1042.    PNG_EMPTY);

  1043. 

  1044. /* Free an allocated jmp_buf (always succeeds) */

  1045. PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);

  1046. 

  1047. /* Function to allocate memory for zlib.  PNGAPI is disallowed. */

  1048. PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),

  1049.    PNG_ALLOCATED);

  1050. 

  1051. /* Function to free memory for zlib.  PNGAPI is disallowed. */

  1052. PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);

  1053. 

  1054. /* Next four functions are used internally as callbacks.  PNGCBAPI is required

  1055.  * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3, changed to

  1056.  * PNGCBAPI at 1.5.0

  1057.  */

  1058. 

  1059. PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,

  1060.     png_bytep data, size_t length),PNG_EMPTY);

  1061. 

  1062. #ifdef PNG_PROGRESSIVE_READ_SUPPORTED

  1063. PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,

  1064.     png_bytep buffer, size_t length),PNG_EMPTY);

  1065. #endif

  1066. 

  1067. PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,

  1068.     png_bytep data, size_t length),PNG_EMPTY);

  1069. 

  1070. #ifdef PNG_WRITE_FLUSH_SUPPORTED

  1071. #  ifdef PNG_STDIO_SUPPORTED

  1072. PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),

  1073.    PNG_EMPTY);

  1074. #  endif

  1075. #endif

  1076. 

  1077. /* Reset the CRC variable */

  1078. PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);

  1079. 

  1080. /* Write the "data" buffer to whatever output you are using */

  1081. PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,

  1082.     png_const_bytep data, size_t length),PNG_EMPTY);

  1083. 

  1084. /* Read and check the PNG file signature */

  1085. PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,

  1086.    png_inforp info_ptr),PNG_EMPTY);

  1087. 

  1088. /* Read the chunk header (length + type name) */

  1089. PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),

  1090.    PNG_EMPTY);

  1091. 

  1092. /* Read data from whatever input you are using into the "data" buffer */

  1093. PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,

  1094.     size_t length),PNG_EMPTY);

  1095. 

  1096. /* Read bytes into buf, and update png_ptr->crc */

  1097. PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,

  1098.     png_uint_32 length),PNG_EMPTY);

  1099. 

  1100. /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */

  1101. PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,

  1102.    png_uint_32 skip),PNG_EMPTY);

  1103. 

  1104. /* Read the CRC from the file and compare it to the libpng calculated CRC */

  1105. PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);

  1106. 

  1107. /* Calculate the CRC over a section of data.  Note that we are only

  1108.  * passing a maximum of 64K on systems that have this as a memory limit,

  1109.  * since this is the maximum buffer size we can specify.

  1110.  */

  1111. PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,

  1112.    png_const_bytep ptr, size_t length),PNG_EMPTY);

  1113. 

  1114. #ifdef PNG_WRITE_FLUSH_SUPPORTED

  1115. PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);

  1116. #endif

  1117. 

  1118. /* Write various chunks */

  1119. 

  1120. /* Write the IHDR chunk, and update the png_struct with the necessary

  1121.  * information.

  1122.  */

  1123. PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,

  1124.    png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,

  1125.    int compression_method, int filter_method, int interlace_method),PNG_EMPTY);

  1126. 

  1127. PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,

  1128.    png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);

  1129. 

  1130. PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,

  1131.    png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),

  1132.    PNG_EMPTY);

  1133. 

  1134. PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);

  1135. 

  1136. #ifdef PNG_WRITE_gAMA_SUPPORTED

  1137. PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,

  1138.     png_fixed_point file_gamma),PNG_EMPTY);

  1139. #endif

  1140. 

  1141. #ifdef PNG_WRITE_sBIT_SUPPORTED

  1142. PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,

  1143.     png_const_color_8p sbit, int color_type),PNG_EMPTY);

  1144. #endif

  1145. 

  1146. #ifdef PNG_WRITE_cHRM_SUPPORTED

  1147. PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,

  1148.     const png_xy *xy), PNG_EMPTY);

  1149.    /* The xy value must have been previously validated */

  1150. #endif

  1151. 

  1152. #ifdef PNG_WRITE_sRGB_SUPPORTED

  1153. PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,

  1154.     int intent),PNG_EMPTY);

  1155. #endif

  1156. 

  1157. #ifdef PNG_WRITE_eXIf_SUPPORTED

  1158. PNG_INTERNAL_FUNCTION(void,png_write_eXIf,(png_structrp png_ptr,

  1159.     png_bytep exif, int num_exif),PNG_EMPTY);

  1160. #endif

  1161. 

  1162. #ifdef PNG_WRITE_iCCP_SUPPORTED

  1163. PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,

  1164.    png_const_charp name, png_const_bytep profile), PNG_EMPTY);

  1165.    /* The profile must have been previously validated for correctness, the

  1166.     * length comes from the first four bytes.  Only the base, deflate,

  1167.     * compression is supported.

  1168.     */

  1169. #endif

  1170. 

  1171. #ifdef PNG_WRITE_sPLT_SUPPORTED

  1172. PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,

  1173.     png_const_sPLT_tp palette),PNG_EMPTY);

  1174. #endif

  1175. 

  1176. #ifdef PNG_WRITE_tRNS_SUPPORTED

  1177. PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,

  1178.     png_const_bytep trans, png_const_color_16p values, int number,

  1179.     int color_type),PNG_EMPTY);

  1180. #endif

  1181. 

  1182. #ifdef PNG_WRITE_bKGD_SUPPORTED

  1183. PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,

  1184.     png_const_color_16p values, int color_type),PNG_EMPTY);

  1185. #endif

  1186. 

  1187. #ifdef PNG_WRITE_hIST_SUPPORTED

  1188. PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,

  1189.     png_const_uint_16p hist, int num_hist),PNG_EMPTY);

  1190. #endif

  1191. 

  1192. /* Chunks that have keywords */

  1193. #ifdef PNG_WRITE_tEXt_SUPPORTED

  1194. PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,

  1195.    png_const_charp key, png_const_charp text, size_t text_len),PNG_EMPTY);

  1196. #endif

  1197. 

  1198. #ifdef PNG_WRITE_zTXt_SUPPORTED

  1199. PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp

  1200.     key, png_const_charp text, int compression),PNG_EMPTY);

  1201. #endif

  1202. 

  1203. #ifdef PNG_WRITE_iTXt_SUPPORTED

  1204. PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,

  1205.     int compression, png_const_charp key, png_const_charp lang,

  1206.     png_const_charp lang_key, png_const_charp text),PNG_EMPTY);

  1207. #endif

  1208. 

  1209. #ifdef PNG_TEXT_SUPPORTED  /* Added at version 1.0.14 and 1.2.4 */

  1210. PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,

  1211.     png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);

  1212. #endif

  1213. 

  1214. #ifdef PNG_WRITE_oFFs_SUPPORTED

  1215. PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,

  1216.     png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);

  1217. #endif

  1218. 

  1219. #ifdef PNG_WRITE_pCAL_SUPPORTED

  1220. PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,

  1221.     png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,

  1222.     png_const_charp units, png_charpp params),PNG_EMPTY);

  1223. #endif

  1224. 

  1225. #ifdef PNG_WRITE_pHYs_SUPPORTED

  1226. PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,

  1227.     png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,

  1228.     int unit_type),PNG_EMPTY);

  1229. #endif

  1230. 

  1231. #ifdef PNG_WRITE_tIME_SUPPORTED

  1232. PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,

  1233.     png_const_timep mod_time),PNG_EMPTY);

  1234. #endif

  1235. 

  1236. #ifdef PNG_WRITE_sCAL_SUPPORTED

  1237. PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,

  1238.     int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);

  1239. #endif

  1240. 

  1241. /* Called when finished processing a row of data */

  1242. PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),

  1243.     PNG_EMPTY);

  1244. 

  1245. /* Internal use only.   Called before first row of data */

  1246. PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),

  1247.     PNG_EMPTY);

  1248. 

  1249. /* Combine a row of data, dealing with alpha, etc. if requested.  'row' is an

  1250.  * array of png_ptr->width pixels.  If the image is not interlaced or this

  1251.  * is the final pass this just does a memcpy, otherwise the "display" flag

  1252.  * is used to determine whether to copy pixels that are not in the current pass.

  1253.  *

  1254.  * Because 'png_do_read_interlace' (below) replicates pixels this allows this

  1255.  * function to achieve the documented 'blocky' appearance during interlaced read

  1256.  * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'

  1257.  * are not changed if they are not in the current pass, when display is 0.

  1258.  *

  1259.  * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.

  1260.  *

  1261.  * The API always reads from the png_struct row buffer and always assumes that

  1262.  * it is full width (png_do_read_interlace has already been called.)

  1263.  *

  1264.  * This function is only ever used to write to row buffers provided by the

  1265.  * caller of the relevant libpng API and the row must have already been

  1266.  * transformed by the read transformations.

  1267.  *

  1268.  * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed

  1269.  * bitmasks for use within the code, otherwise runtime generated masks are used.

  1270.  * The default is compile time masks.

  1271.  */

  1272. #ifndef PNG_USE_COMPILE_TIME_MASKS

  1273. #  define PNG_USE_COMPILE_TIME_MASKS 1

  1274. #endif

  1275. PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,

  1276.     png_bytep row, int display),PNG_EMPTY);

  1277. 

  1278. #ifdef PNG_READ_INTERLACING_SUPPORTED

  1279. /* Expand an interlaced row: the 'row_info' describes the pass data that has

  1280.  * been read in and must correspond to the pixels in 'row', the pixels are

  1281.  * expanded (moved apart) in 'row' to match the final layout, when doing this

  1282.  * the pixels are *replicated* to the intervening space.  This is essential for

  1283.  * the correct operation of png_combine_row, above.

  1284.  */

  1285. PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,

  1286.     png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);

  1287. #endif

  1288. 

  1289. /* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */

  1290. 

  1291. #ifdef PNG_WRITE_INTERLACING_SUPPORTED

  1292. /* Grab pixels out of a row for an interlaced pass */

  1293. PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,

  1294.     png_bytep row, int pass),PNG_EMPTY);

  1295. #endif

  1296. 

  1297. /* Unfilter a row: check the filter value before calling this, there is no point

  1298.  * calling it for PNG_FILTER_VALUE_NONE.

  1299.  */

  1300. PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop

  1301.     row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);

  1302. 

  1303. #if PNG_ARM_NEON_OPT > 0

  1304. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,

  1305.     png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1306. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop

  1307.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1308. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop

  1309.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1310. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop

  1311.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1312. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop

  1313.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1314. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop

  1315.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1316. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop

  1317.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1318. #endif

  1319. 

  1320. #if PNG_MIPS_MSA_OPT > 0

  1321. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_msa,(png_row_infop row_info,

  1322.     png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1323. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_msa,(png_row_infop

  1324.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1325. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_msa,(png_row_infop

  1326.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1327. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_msa,(png_row_infop

  1328.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1329. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_msa,(png_row_infop

  1330.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1331. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_msa,(png_row_infop

  1332.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1333. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_msa,(png_row_infop

  1334.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1335. #endif

  1336. 

  1337. #if PNG_POWERPC_VSX_OPT > 0

  1338. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_vsx,(png_row_infop row_info,

  1339.     png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1340. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_vsx,(png_row_infop

  1341.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1342. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_vsx,(png_row_infop

  1343.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1344. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_vsx,(png_row_infop

  1345.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1346. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_vsx,(png_row_infop

  1347.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1348. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_vsx,(png_row_infop

  1349.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1350. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_vsx,(png_row_infop

  1351.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1352. #endif

  1353. 

  1354. #if PNG_INTEL_SSE_IMPLEMENTATION > 0

  1355. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop

  1356.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1357. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop

  1358.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1359. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop

  1360.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1361. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop

  1362.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1363. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop

  1364.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1365. PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(png_row_infop

  1366.     row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);

  1367. #endif

  1368. 

  1369. /* Choose the best filter to use and filter the row data */

  1370. PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,

  1371.     png_row_infop row_info),PNG_EMPTY);

  1372. 

  1373. #ifdef PNG_SEQUENTIAL_READ_SUPPORTED

  1374. PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,

  1375.    png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);

  1376.    /* Read 'avail_out' bytes of data from the IDAT stream.  If the output buffer

  1377.     * is NULL the function checks, instead, for the end of the stream.  In this

  1378.     * case a benign error will be issued if the stream end is not found or if

  1379.     * extra data has to be consumed.

  1380.     */

  1381. PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),

  1382.    PNG_EMPTY);

  1383.    /* This cleans up when the IDAT LZ stream does not end when the last image

  1384.     * byte is read; there is still some pending input.

  1385.     */

  1386. 

  1387. PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),

  1388.    PNG_EMPTY);

  1389.    /* Finish a row while reading, dealing with interlacing passes, etc. */

  1390. #endif /* SEQUENTIAL_READ */

  1391. 

  1392. /* Initialize the row buffers, etc. */

  1393. PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);

  1394. 

  1395. #if ZLIB_VERNUM >= 0x1240

  1396. PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush),

  1397.       PNG_EMPTY);

  1398. #  define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush)

  1399. #else /* Zlib < 1.2.4 */

  1400. #  define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush)

  1401. #endif /* Zlib < 1.2.4 */

  1402. 

  1403. #ifdef PNG_READ_TRANSFORMS_SUPPORTED

  1404. /* Optional call to update the users info structure */

  1405. PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,

  1406.     png_inforp info_ptr),PNG_EMPTY);

  1407. #endif

  1408. 

  1409. /* Shared transform functions, defined in pngtran.c */

  1410. #if defined(PNG_WRITE_FILLER_SUPPORTED) || \

  1411.     defined(PNG_READ_STRIP_ALPHA_SUPPORTED)

  1412. PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,

  1413.     png_bytep row, int at_start),PNG_EMPTY);

  1414. #endif

  1415. 

  1416. #ifdef PNG_16BIT_SUPPORTED

  1417. #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)

  1418. PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,

  1419.     png_bytep row),PNG_EMPTY);

  1420. #endif

  1421. #endif

  1422. 

  1423. #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \

  1424.     defined(PNG_WRITE_PACKSWAP_SUPPORTED)

  1425. PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,

  1426.     png_bytep row),PNG_EMPTY);

  1427. #endif

  1428. 

  1429. #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)

  1430. PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,

  1431.     png_bytep row),PNG_EMPTY);

  1432. #endif

  1433. 

  1434. #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)

  1435. PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,

  1436.     png_bytep row),PNG_EMPTY);

  1437. #endif

  1438. 

  1439. /* The following decodes the appropriate chunks, and does error correction,

  1440.  * then calls the appropriate callback for the chunk if it is valid.

  1441.  */

  1442. 

  1443. /* Decode the IHDR chunk */

  1444. PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,

  1445.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1446. PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,

  1447.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1448. PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,

  1449.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1450. 

  1451. #ifdef PNG_READ_bKGD_SUPPORTED

  1452. PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,

  1453.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1454. #endif

  1455. 

  1456. #ifdef PNG_READ_cHRM_SUPPORTED

  1457. PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,

  1458.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1459. #endif

  1460. 

  1461. #ifdef PNG_READ_eXIf_SUPPORTED

  1462. PNG_INTERNAL_FUNCTION(void,png_handle_eXIf,(png_structrp png_ptr,

  1463.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1464. #endif

  1465. 

  1466. #ifdef PNG_READ_gAMA_SUPPORTED

  1467. PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,

  1468.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1469. #endif

  1470. 

  1471. #ifdef PNG_READ_hIST_SUPPORTED

  1472. PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,

  1473.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1474. #endif

  1475. 

  1476. #ifdef PNG_READ_iCCP_SUPPORTED

  1477. PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,

  1478.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1479. #endif /* READ_iCCP */

  1480. 

  1481. #ifdef PNG_READ_iTXt_SUPPORTED

  1482. PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,

  1483.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1484. #endif

  1485. 

  1486. #ifdef PNG_READ_oFFs_SUPPORTED

  1487. PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,

  1488.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1489. #endif

  1490. 

  1491. #ifdef PNG_READ_pCAL_SUPPORTED

  1492. PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,

  1493.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1494. #endif

  1495. 

  1496. #ifdef PNG_READ_pHYs_SUPPORTED

  1497. PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,

  1498.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1499. #endif

  1500. 

  1501. #ifdef PNG_READ_sBIT_SUPPORTED

  1502. PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,

  1503.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1504. #endif

  1505. 

  1506. #ifdef PNG_READ_sCAL_SUPPORTED

  1507. PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,

  1508.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1509. #endif

  1510. 

  1511. #ifdef PNG_READ_sPLT_SUPPORTED

  1512. PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,

  1513.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1514. #endif /* READ_sPLT */

  1515. 

  1516. #ifdef PNG_READ_sRGB_SUPPORTED

  1517. PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,

  1518.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1519. #endif

  1520. 

  1521. #ifdef PNG_READ_tEXt_SUPPORTED

  1522. PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,

  1523.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1524. #endif

  1525. 

  1526. #ifdef PNG_READ_tIME_SUPPORTED

  1527. PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,

  1528.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1529. #endif

  1530. 

  1531. #ifdef PNG_READ_tRNS_SUPPORTED

  1532. PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,

  1533.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1534. #endif

  1535. 

  1536. #ifdef PNG_READ_zTXt_SUPPORTED

  1537. PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,

  1538.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1539. #endif

  1540. 

  1541. PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_const_structrp png_ptr,

  1542.     png_uint_32 chunk_name),PNG_EMPTY);

  1543. 

  1544. PNG_INTERNAL_FUNCTION(void,png_check_chunk_length,(png_const_structrp png_ptr,

  1545.     png_uint_32 chunk_length),PNG_EMPTY);

  1546. 

  1547. PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,

  1548.     png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);

  1549.    /* This is the function that gets called for unknown chunks.  The 'keep'

  1550.     * argument is either non-zero for a known chunk that has been set to be

  1551.     * handled as unknown or zero for an unknown chunk.  By default the function

  1552.     * just skips the chunk or errors out if it is critical.

  1553.     */

  1554. 

  1555. #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\

  1556.     defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)

  1557. PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,

  1558.     (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);

  1559.    /* Exactly as the API png_handle_as_unknown() except that the argument is a

  1560.     * 32-bit chunk name, not a string.

  1561.     */

  1562. #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */

  1563. 

  1564. /* Handle the transformations for reading and writing */

  1565. #ifdef PNG_READ_TRANSFORMS_SUPPORTED

  1566. PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,

  1567.    png_row_infop row_info),PNG_EMPTY);

  1568. #endif

  1569. #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED

  1570. PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,

  1571.    png_row_infop row_info),PNG_EMPTY);

  1572. #endif

  1573. 

  1574. #ifdef PNG_READ_TRANSFORMS_SUPPORTED

  1575. PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),

  1576.     PNG_EMPTY);

  1577. #endif

  1578. 

  1579. #ifdef PNG_PROGRESSIVE_READ_SUPPORTED

  1580. PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,

  1581.     png_inforp info_ptr),PNG_EMPTY);

  1582. PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,

  1583.     png_inforp info_ptr),PNG_EMPTY);

  1584. PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);

  1585. PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),

  1586.     PNG_EMPTY);

  1587. PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,

  1588.     png_bytep buffer, size_t buffer_length),PNG_EMPTY);

  1589. PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);

  1590. PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,

  1591.     png_bytep buffer, size_t buffer_length),PNG_EMPTY);

  1592. PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),

  1593.     PNG_EMPTY);

  1594. PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,

  1595.    png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1596. PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,

  1597.    png_inforp info_ptr),PNG_EMPTY);

  1598. PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,

  1599.    png_inforp info_ptr),PNG_EMPTY);

  1600. PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,

  1601.     png_bytep row),PNG_EMPTY);

  1602. PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,

  1603.     png_inforp info_ptr),PNG_EMPTY);

  1604. PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,

  1605.     png_inforp info_ptr),PNG_EMPTY);

  1606. PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),

  1607.     PNG_EMPTY);

  1608. #  ifdef PNG_READ_tEXt_SUPPORTED

  1609. PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,

  1610.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1611. PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,

  1612.     png_inforp info_ptr),PNG_EMPTY);

  1613. #  endif

  1614. #  ifdef PNG_READ_zTXt_SUPPORTED

  1615. PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,

  1616.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1617. PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,

  1618.     png_inforp info_ptr),PNG_EMPTY);

  1619. #  endif

  1620. #  ifdef PNG_READ_iTXt_SUPPORTED

  1621. PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,

  1622.     png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);

  1623. PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,

  1624.     png_inforp info_ptr),PNG_EMPTY);

  1625. #  endif

  1626. 

  1627. #endif /* PROGRESSIVE_READ */

  1628. 

  1629. /* Added at libpng version 1.6.0 */

  1630. #ifdef PNG_GAMMA_SUPPORTED

  1631. PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,

  1632.     png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);

  1633.    /* Set the colorspace gamma with a value provided by the application or by

  1634.     * the gAMA chunk on read.  The value will override anything set by an ICC

  1635.     * profile.

  1636.     */

  1637. 

  1638. PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,

  1639.     png_inforp info_ptr), PNG_EMPTY);

  1640.    /* Synchronize the info 'valid' flags with the colorspace */

  1641. 

  1642. PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,

  1643.     png_inforp info_ptr), PNG_EMPTY);

  1644.    /* Copy the png_struct colorspace to the info_struct and call the above to

  1645.     * synchronize the flags.  Checks for NULL info_ptr and does nothing.

  1646.     */

  1647. #endif

  1648. 

  1649. /* Added at libpng version 1.4.0 */

  1650. #ifdef PNG_COLORSPACE_SUPPORTED

  1651. /* These internal functions are for maintaining the colorspace structure within

  1652.  * a png_info or png_struct (or, indeed, both).

  1653.  */

  1654. PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,

  1655.    (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,

  1656.     int preferred), PNG_EMPTY);

  1657. 

  1658. PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,

  1659.    (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,

  1660.     int preferred), PNG_EMPTY);

  1661. 

  1662. #ifdef PNG_sRGB_SUPPORTED

  1663. PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,

  1664.    png_colorspacerp colorspace, int intent), PNG_EMPTY);

  1665.    /* This does set the colorspace gAMA and cHRM values too, but doesn't set the

  1666.     * flags to write them, if it returns false there was a problem and an error

  1667.     * message has already been output (but the colorspace may still need to be

  1668.     * synced to record the invalid flag).

  1669.     */

  1670. #endif /* sRGB */

  1671. 

  1672. #ifdef PNG_iCCP_SUPPORTED

  1673. PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,

  1674.    png_colorspacerp colorspace, png_const_charp name,

  1675.    png_uint_32 profile_length, png_const_bytep profile, int color_type),

  1676.    PNG_EMPTY);

  1677.    /* The 'name' is used for information only */

  1678. 

  1679. /* Routines for checking parts of an ICC profile. */

  1680. #ifdef PNG_READ_iCCP_SUPPORTED

  1681. PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,

  1682.    png_colorspacerp colorspace, png_const_charp name,

  1683.    png_uint_32 profile_length), PNG_EMPTY);

  1684. #endif /* READ_iCCP */

  1685. PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,

  1686.    png_colorspacerp colorspace, png_const_charp name,

  1687.    png_uint_32 profile_length,

  1688.    png_const_bytep profile /* first 132 bytes only */, int color_type),

  1689.    PNG_EMPTY);

  1690. PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,

  1691.    png_colorspacerp colorspace, png_const_charp name,

  1692.    png_uint_32 profile_length,

  1693.    png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);

  1694. #ifdef PNG_sRGB_SUPPORTED

  1695. PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(

  1696.    png_const_structrp png_ptr, png_colorspacerp colorspace,

  1697.    png_const_bytep profile, uLong adler), PNG_EMPTY);

  1698.    /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may

  1699.     * be zero to indicate that it is not available.  It is used, if provided,

  1700.     * as a fast check on the profile when checking to see if it is sRGB.

  1701.     */

  1702. #endif

  1703. #endif /* iCCP */

  1704. 

  1705. #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED

  1706. PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,

  1707.    (png_structrp png_ptr), PNG_EMPTY);

  1708.    /* Set the rgb_to_gray coefficients from the colorspace Y values */

  1709. #endif /* READ_RGB_TO_GRAY */

  1710. #endif /* COLORSPACE */

  1711. 

  1712. /* Added at libpng version 1.4.0 */

  1713. PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,

  1714.     png_uint_32 width, png_uint_32 height, int bit_depth,

  1715.     int color_type, int interlace_type, int compression_type,

  1716.     int filter_type),PNG_EMPTY);

  1717. 

  1718. /* Added at libpng version 1.5.10 */

  1719. #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \

  1720.     defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)

  1721. PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,

  1722.    (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);

  1723. #endif

  1724. 

  1725. #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)

  1726. PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,

  1727.    png_const_charp name),PNG_NORETURN);

  1728. #endif

  1729. 

  1730. /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite

  1731.  * the end.  Always leaves the buffer nul terminated.  Never errors out (and

  1732.  * there is no error code.)

  1733.  */

  1734. PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,

  1735.    size_t pos, png_const_charp string),PNG_EMPTY);

  1736. 

  1737. /* Various internal functions to handle formatted warning messages, currently

  1738.  * only implemented for warnings.

  1739.  */

  1740. #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)

  1741. /* Utility to dump an unsigned value into a buffer, given a start pointer and

  1742.  * and end pointer (which should point just *beyond* the end of the buffer!)

  1743.  * Returns the pointer to the start of the formatted string.  This utility only

  1744.  * does unsigned values.

  1745.  */

  1746. PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,

  1747.    png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);

  1748. 

  1749. /* Convenience macro that takes an array: */

  1750. #define PNG_FORMAT_NUMBER(buffer,format,number) \

  1751.    png_format_number(buffer, buffer + (sizeof buffer), format, number)

  1752. 

  1753. /* Suggested size for a number buffer (enough for 64 bits and a sign!) */

  1754. #define PNG_NUMBER_BUFFER_SIZE 24

  1755. 

  1756. /* These are the integer formats currently supported, the name is formed from

  1757.  * the standard printf(3) format string.

  1758.  */

  1759. #define PNG_NUMBER_FORMAT_u     1 /* chose unsigned API! */

  1760. #define PNG_NUMBER_FORMAT_02u   2

  1761. #define PNG_NUMBER_FORMAT_d     1 /* chose signed API! */

  1762. #define PNG_NUMBER_FORMAT_02d   2

  1763. #define PNG_NUMBER_FORMAT_x     3

  1764. #define PNG_NUMBER_FORMAT_02x   4

  1765. #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */

  1766. #endif

  1767. 

  1768. #ifdef PNG_WARNINGS_SUPPORTED

  1769. /* New defines and members adding in libpng-1.5.4 */

  1770. #  define PNG_WARNING_PARAMETER_SIZE 32

  1771. #  define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */

  1772. 

  1773. /* An l-value of this type has to be passed to the APIs below to cache the

  1774.  * values of the parameters to a formatted warning message.

  1775.  */

  1776. typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][

  1777.    PNG_WARNING_PARAMETER_SIZE];

  1778. 

  1779. PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,

  1780.    int number, png_const_charp string),PNG_EMPTY);

  1781.    /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,

  1782.     * including the trailing '\0'.

  1783.     */

  1784. PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,

  1785.    (png_warning_parameters p, int number, int format, png_alloc_size_t value),

  1786.    PNG_EMPTY);

  1787.    /* Use png_alloc_size_t because it is an unsigned type as big as any we

  1788.     * need to output.  Use the following for a signed value.

  1789.     */

  1790. PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,

  1791.    (png_warning_parameters p, int number, int format, png_int_32 value),

  1792.    PNG_EMPTY);

  1793. 

  1794. PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,

  1795.    png_warning_parameters p, png_const_charp message),PNG_EMPTY);

  1796.    /* 'message' follows the X/Open approach of using @1, @2 to insert

  1797.     * parameters previously supplied using the above functions.  Errors in

  1798.     * specifying the parameters will simply result in garbage substitutions.

  1799.     */

  1800. #endif

  1801. 

  1802. #ifdef PNG_BENIGN_ERRORS_SUPPORTED

  1803. /* Application errors (new in 1.6); use these functions (declared below) for

  1804.  * errors in the parameters or order of API function calls on read.  The

  1805.  * 'warning' should be used for an error that can be handled completely; the

  1806.  * 'error' for one which can be handled safely but which may lose application

  1807.  * information or settings.

  1808.  *

  1809.  * By default these both result in a png_error call prior to release, while in a

  1810.  * released version the 'warning' is just a warning.  However if the application

  1811.  * explicitly disables benign errors (explicitly permitting the code to lose

  1812.  * information) they both turn into warnings.

  1813.  *

  1814.  * If benign errors aren't supported they end up as the corresponding base call

  1815.  * (png_warning or png_error.)

  1816.  */

  1817. PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,

  1818.    png_const_charp message),PNG_EMPTY);

  1819.    /* The application provided invalid parameters to an API function or called

  1820.     * an API function at the wrong time, libpng can completely recover.

  1821.     */

  1822. 

  1823. PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,

  1824.    png_const_charp message),PNG_EMPTY);

  1825.    /* As above but libpng will ignore the call, or attempt some other partial

  1826.     * recovery from the error.

  1827.     */

  1828. #else

  1829. #  define png_app_warning(pp,s) png_warning(pp,s)

  1830. #  define png_app_error(pp,s) png_error(pp,s)

  1831. #endif

  1832. 

  1833. PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,

  1834.    png_const_charp message, int error),PNG_EMPTY);

  1835.    /* Report a recoverable issue in chunk data.  On read this is used to report

  1836.     * a problem found while reading a particular chunk and the

  1837.     * png_chunk_benign_error or png_chunk_warning function is used as

  1838.     * appropriate.  On write this is used to report an error that comes from

  1839.     * data set via an application call to a png_set_ API and png_app_error or

  1840.     * png_app_warning is used as appropriate.

  1841.     *

  1842.     * The 'error' parameter must have one of the following values:

  1843.     */

  1844. #define PNG_CHUNK_WARNING     0 /* never an error */

  1845. #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */

  1846. #define PNG_CHUNK_ERROR       2 /* always an error */

  1847. 

  1848. /* ASCII to FP interfaces, currently only implemented if sCAL

  1849.  * support is required.

  1850.  */

  1851. #if defined(PNG_sCAL_SUPPORTED)

  1852. /* MAX_DIGITS is actually the maximum number of characters in an sCAL

  1853.  * width or height, derived from the precision (number of significant

  1854.  * digits - a build time settable option) and assumptions about the

  1855.  * maximum ridiculous exponent.

  1856.  */

  1857. #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)

  1858. 

  1859. #ifdef PNG_FLOATING_POINT_SUPPORTED

  1860. PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,

  1861.    png_charp ascii, size_t size, double fp, unsigned int precision),

  1862.    PNG_EMPTY);

  1863. #endif /* FLOATING_POINT */

  1864. 

  1865. #ifdef PNG_FIXED_POINT_SUPPORTED

  1866. PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,

  1867.    png_charp ascii, size_t size, png_fixed_point fp),PNG_EMPTY);

  1868. #endif /* FIXED_POINT */

  1869. #endif /* sCAL */

  1870. 

  1871. #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)

  1872. /* An internal API to validate the format of a floating point number.

  1873.  * The result is the index of the next character.  If the number is

  1874.  * not valid it will be the index of a character in the supposed number.

  1875.  *

  1876.  * The format of a number is defined in the PNG extensions specification

  1877.  * and this API is strictly conformant to that spec, not anyone elses!

  1878.  *

  1879.  * The format as a regular expression is:

  1880.  *

  1881.  * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?

  1882.  *

  1883.  * or:

  1884.  *

  1885.  * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?

  1886.  *

  1887.  * The complexity is that either integer or fraction must be present and the

  1888.  * fraction is permitted to have no digits only if the integer is present.

  1889.  *

  1890.  * NOTE: The dangling E problem.

  1891.  *   There is a PNG valid floating point number in the following:

  1892.  *

  1893.  *       PNG floating point numbers are not greedy.

  1894.  *

  1895.  *   Working this out requires *TWO* character lookahead (because of the

  1896.  *   sign), the parser does not do this - it will fail at the 'r' - this

  1897.  *   doesn't matter for PNG sCAL chunk values, but it requires more care

  1898.  *   if the value were ever to be embedded in something more complex.  Use

  1899.  *   ANSI-C strtod if you need the lookahead.

  1900.  */

  1901. /* State table for the parser. */

  1902. #define PNG_FP_INTEGER    0  /* before or in integer */

  1903. #define PNG_FP_FRACTION   1  /* before or in fraction */

  1904. #define PNG_FP_EXPONENT   2  /* before or in exponent */

  1905. #define PNG_FP_STATE      3  /* mask for the above */

  1906. #define PNG_FP_SAW_SIGN   4  /* Saw +/- in current state */

  1907. #define PNG_FP_SAW_DIGIT  8  /* Saw a digit in current state */

  1908. #define PNG_FP_SAW_DOT   16  /* Saw a dot in current state */

  1909. #define PNG_FP_SAW_E     32  /* Saw an E (or e) in current state */

  1910. #define PNG_FP_SAW_ANY   60  /* Saw any of the above 4 */

  1911. 

  1912. /* These three values don't affect the parser.  They are set but not used.

  1913.  */

  1914. #define PNG_FP_WAS_VALID 64  /* Preceding substring is a valid fp number */

  1915. #define PNG_FP_NEGATIVE 128  /* A negative number, including "-0" */

  1916. #define PNG_FP_NONZERO  256  /* A non-zero value */

  1917. #define PNG_FP_STICKY   448  /* The above three flags */

  1918. 

  1919. /* This is available for the caller to store in 'state' if required.  Do not

  1920.  * call the parser after setting it (the parser sometimes clears it.)

  1921.  */

  1922. #define PNG_FP_INVALID  512  /* Available for callers as a distinct value */

  1923. 

  1924. /* Result codes for the parser (boolean - true meants ok, false means

  1925.  * not ok yet.)

  1926.  */

  1927. #define PNG_FP_MAYBE      0  /* The number may be valid in the future */

  1928. #define PNG_FP_OK         1  /* The number is valid */

  1929. 

  1930. /* Tests on the sticky non-zero and negative flags.  To pass these checks

  1931.  * the state must also indicate that the whole number is valid - this is

  1932.  * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this

  1933.  * is equivalent to PNG_FP_OK above.)

  1934.  */

  1935. #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)

  1936.    /* NZ_MASK: the string is valid and a non-zero negative value */

  1937. #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)

  1938.    /* Z MASK: the string is valid and a non-zero value. */

  1939.    /* PNG_FP_SAW_DIGIT: the string is valid. */

  1940. #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)

  1941. #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)

  1942. #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)

  1943. 

  1944. /* The actual parser.  This can be called repeatedly. It updates

  1945.  * the index into the string and the state variable (which must

  1946.  * be initialized to 0).  It returns a result code, as above.  There

  1947.  * is no point calling the parser any more if it fails to advance to

  1948.  * the end of the string - it is stuck on an invalid character (or

  1949.  * terminated by '\0').

  1950.  *

  1951.  * Note that the pointer will consume an E or even an E+ and then leave

  1952.  * a 'maybe' state even though a preceding integer.fraction is valid.

  1953.  * The PNG_FP_WAS_VALID flag indicates that a preceding substring was

  1954.  * a valid number.  It's possible to recover from this by calling

  1955.  * the parser again (from the start, with state 0) but with a string

  1956.  * that omits the last character (i.e. set the size to the index of

  1957.  * the problem character.)  This has not been tested within libpng.

  1958.  */

  1959. PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,

  1960.    size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);

  1961. 

  1962. /* This is the same but it checks a complete string and returns true

  1963.  * only if it just contains a floating point number.  As of 1.5.4 this

  1964.  * function also returns the state at the end of parsing the number if

  1965.  * it was valid (otherwise it returns 0.)  This can be used for testing

  1966.  * for negative or zero values using the sticky flag.

  1967.  */

  1968. PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,

  1969.    size_t size),PNG_EMPTY);

  1970. #endif /* pCAL || sCAL */

  1971. 

  1972. #if defined(PNG_GAMMA_SUPPORTED) ||\

  1973.     defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)

  1974. /* Added at libpng version 1.5.0 */

  1975. /* This is a utility to provide a*times/div (rounded) and indicate

  1976.  * if there is an overflow.  The result is a boolean - false (0)

  1977.  * for overflow, true (1) if no overflow, in which case *res

  1978.  * holds the result.

  1979.  */

  1980. PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,

  1981.    png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);

  1982. #endif

  1983. 

  1984. #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)

  1985. /* Same deal, but issue a warning on overflow and return 0. */

  1986. PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,

  1987.    (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,

  1988.    png_int_32 divided_by),PNG_EMPTY);

  1989. #endif

  1990. 

  1991. #ifdef PNG_GAMMA_SUPPORTED

  1992. /* Calculate a reciprocal - used for gamma values.  This returns

  1993.  * 0 if the argument is 0 in order to maintain an undefined value;

  1994.  * there are no warnings.

  1995.  */

  1996. PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),

  1997.    PNG_EMPTY);

  1998. 

  1999. #ifdef PNG_READ_GAMMA_SUPPORTED

  2000. /* The same but gives a reciprocal of the product of two fixed point

  2001.  * values.  Accuracy is suitable for gamma calculations but this is

  2002.  * not exact - use png_muldiv for that.  Only required at present on read.

  2003.  */

  2004. PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,

  2005.    png_fixed_point b),PNG_EMPTY);

  2006. #endif

  2007. 

  2008. /* Return true if the gamma value is significantly different from 1.0 */

  2009. PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),

  2010.    PNG_EMPTY);

  2011. #endif

  2012. 

  2013. #ifdef PNG_READ_GAMMA_SUPPORTED

  2014. /* Internal fixed point gamma correction.  These APIs are called as

  2015.  * required to convert single values - they don't need to be fast,

  2016.  * they are not used when processing image pixel values.

  2017.  *

  2018.  * While the input is an 'unsigned' value it must actually be the

  2019.  * correct bit value - 0..255 or 0..65535 as required.

  2020.  */

  2021. PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,

  2022.    unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);

  2023. PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,

  2024.    png_fixed_point gamma_value),PNG_EMPTY);

  2025. PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,

  2026.    png_fixed_point gamma_value),PNG_EMPTY);

  2027. PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),

  2028.    PNG_EMPTY);

  2029. PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,

  2030.    int bit_depth),PNG_EMPTY);

  2031. #endif

  2032. 

  2033. /* SIMPLIFIED READ/WRITE SUPPORT */

  2034. #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\

  2035.    defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)

  2036. /* The internal structure that png_image::opaque points to. */

  2037. typedef struct png_control

  2038. {

  2039.    png_structp png_ptr;

  2040.    png_infop   info_ptr;

  2041.    png_voidp   error_buf;           /* Always a jmp_buf at present. */

  2042. 

  2043.    png_const_bytep memory;          /* Memory buffer. */

  2044.    size_t          size;            /* Size of the memory buffer. */

  2045. 

  2046.    unsigned int for_write       :1; /* Otherwise it is a read structure */

  2047.    unsigned int owned_file      :1; /* We own the file in io_ptr */

  2048. } png_control;

  2049. 

  2050. /* Return the pointer to the jmp_buf from a png_control: necessary because C

  2051.  * does not reveal the type of the elements of jmp_buf.

  2052.  */

  2053. #ifdef __cplusplus

  2054. #  define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])

  2055. #else

  2056. #  define png_control_jmp_buf(pc) ((pc)->error_buf)

  2057. #endif

  2058. 

  2059. /* Utility to safely execute a piece of libpng code catching and logging any

  2060.  * errors that might occur.  Returns true on success, false on failure (either

  2061.  * of the function or as a result of a png_error.)

  2062.  */

  2063. PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr,

  2064.    png_const_charp error_message),PNG_NORETURN);

  2065. 

  2066. #ifdef PNG_WARNINGS_SUPPORTED

  2067. PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr,

  2068.    png_const_charp warning_message),PNG_EMPTY);

  2069. #else

  2070. #  define png_safe_warning 0/*dummy argument*/

  2071. #endif

  2072. 

  2073. PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,

  2074.    int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);

  2075. 

  2076. /* Utility to log an error; this also cleans up the png_image; the function

  2077.  * always returns 0 (false).

  2078.  */

  2079. PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,

  2080.    png_const_charp error_message),PNG_EMPTY);

  2081. 

  2082. #ifndef PNG_SIMPLIFIED_READ_SUPPORTED

  2083. /* png_image_free is used by the write code but not exported */

  2084. PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);

  2085. #endif /* !SIMPLIFIED_READ */

  2086. 

  2087. #endif /* SIMPLIFIED READ/WRITE */

  2088. 

  2089. /* These are initialization functions for hardware specific PNG filter

  2090.  * optimizations; list these here then select the appropriate one at compile

  2091.  * time using the macro PNG_FILTER_OPTIMIZATIONS.  If the macro is not defined

  2092.  * the generic code is used.

  2093.  */

  2094. #ifdef PNG_FILTER_OPTIMIZATIONS

  2095. PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,

  2096.    unsigned int bpp), PNG_EMPTY);

  2097.    /* Just declare the optimization that will be used */

  2098. #else

  2099.    /* List *all* the possible optimizations here - this branch is required if

  2100.     * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in

  2101.     * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.

  2102.     */

  2103. #  if PNG_ARM_NEON_OPT > 0

  2104. PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,

  2105.    (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);

  2106. #endif

  2107. 

  2108. #if PNG_MIPS_MSA_OPT > 0

  2109. PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_msa,

  2110.    (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);

  2111. #endif

  2112. 

  2113. #  if PNG_INTEL_SSE_IMPLEMENTATION > 0

  2114. PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2,

  2115.    (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);

  2116. #  endif

  2117. #endif

  2118. 

  2119. PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr,

  2120.    png_const_charp key, png_bytep new_key), PNG_EMPTY);

  2121. 

  2122. #if PNG_ARM_NEON_IMPLEMENTATION == 1

  2123. PNG_INTERNAL_FUNCTION(void,

  2124.                       png_riffle_palette_neon,

  2125.                       (png_structrp),

  2126.                       PNG_EMPTY);

  2127. PNG_INTERNAL_FUNCTION(int,

  2128.                       png_do_expand_palette_rgba8_neon,

  2129.                       (png_structrp,

  2130.                        png_row_infop,

  2131.                        png_const_bytep,

  2132.                        const png_bytepp,

  2133.                        const png_bytepp),

  2134.                       PNG_EMPTY);

  2135. PNG_INTERNAL_FUNCTION(int,

  2136.                       png_do_expand_palette_rgb8_neon,

  2137.                       (png_structrp,

  2138.                        png_row_infop,

  2139.                        png_const_bytep,

  2140.                        const png_bytepp,

  2141.                        const png_bytepp),

  2142.                       PNG_EMPTY);

  2143. #endif

  2144. 

  2145. /* Maintainer: Put new private prototypes here ^ */

  2146. 

  2147. #include "pngdebug.h"

  2148. 

  2149. // JUCE CHANGE STARTS HERE

  2150. //#ifdef __cplusplus

  2151. //}

  2152. //#endif

  2153. // JUCE CHANGE ENDS HERE

  2154. 

  2155. #endif /* PNG_VERSION_INFO_ONLY */

  2156. #endif /* PNGPRIV_H */