source: trunk/third/libpng/pngconf.h @ 20647

Revision 20647, 40.0 KB checked in by zacheiss, 20 years ago (diff)
Assorted security patches.
Line 
1/* pngconf.h - machine configurable file for libpng
2 *
3 * libpng 1.2.5 - October 3, 2002
4 * For conditions of distribution and use, see copyright notice in png.h
5 * Copyright (c) 1998-2002 Glenn Randers-Pehrson
6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
8 */
9
10/* Any machine specific code is near the front of this file, so if you
11 * are configuring libpng for a machine, you may want to read the section
12 * starting here down to where it starts to typedef png_color, png_text,
13 * and png_info.
14 */
15
16#ifndef PNGCONF_H
17#define PNGCONF_H
18
19/* This is the size of the compression buffer, and thus the size of
20 * an IDAT chunk.  Make this whatever size you feel is best for your
21 * machine.  One of these will be allocated per png_struct.  When this
22 * is full, it writes the data to the disk, and does some other
23 * calculations.  Making this an extremely small size will slow
24 * the library down, but you may want to experiment to determine
25 * where it becomes significant, if you are concerned with memory
26 * usage.  Note that zlib allocates at least 32Kb also.  For readers,
27 * this describes the size of the buffer available to read the data in.
28 * Unless this gets smaller than the size of a row (compressed),
29 * it should not make much difference how big this is.
30 */
31
32#ifndef PNG_ZBUF_SIZE
33#  define PNG_ZBUF_SIZE 8192
34#endif
35
36/* Enable if you want a write-only libpng */
37
38#ifndef PNG_NO_READ_SUPPORTED
39#  define PNG_READ_SUPPORTED
40#endif
41
42/* Enable if you want a read-only libpng */
43
44#ifndef PNG_NO_WRITE_SUPPORTED
45#  define PNG_WRITE_SUPPORTED
46#endif
47
48/* Enabled by default in 1.2.0.  You can disable this if you don't need to
49   support PNGs that are embedded in MNG datastreams */
50#if !defined(PNG_1_0_X) && !defined(PNG_NO_MNG_FEATURES)
51#  ifndef PNG_MNG_FEATURES_SUPPORTED
52#    define PNG_MNG_FEATURES_SUPPORTED
53#  endif
54#endif
55
56#ifndef PNG_NO_FLOATING_POINT_SUPPORTED
57#  ifndef PNG_FLOATING_POINT_SUPPORTED
58#    define PNG_FLOATING_POINT_SUPPORTED
59#  endif
60#endif
61
62/* If you are running on a machine where you cannot allocate more
63 * than 64K of memory at once, uncomment this.  While libpng will not
64 * normally need that much memory in a chunk (unless you load up a very
65 * large file), zlib needs to know how big of a chunk it can use, and
66 * libpng thus makes sure to check any memory allocation to verify it
67 * will fit into memory.
68#define PNG_MAX_MALLOC_64K
69 */
70#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
71#  define PNG_MAX_MALLOC_64K
72#endif
73
74/* Special munging to support doing things the 'cygwin' way:
75 * 'Normal' png-on-win32 defines/defaults:
76 *   PNG_BUILD_DLL -- building dll
77 *   PNG_USE_DLL   -- building an application, linking to dll
78 *   (no define)   -- building static library, or building an
79 *                    application and linking to the static lib
80 * 'Cygwin' defines/defaults:
81 *   PNG_BUILD_DLL -- (ignored) building the dll
82 *   (no define)   -- (ignored) building an application, linking to the dll
83 *   PNG_STATIC    -- (ignored) building the static lib, or building an
84 *                    application that links to the static lib.
85 *   ALL_STATIC    -- (ignored) building various static libs, or building an
86 *                    application that links to the static libs.
87 * Thus,
88 * a cygwin user should define either PNG_BUILD_DLL or PNG_STATIC, and
89 * this bit of #ifdefs will define the 'correct' config variables based on
90 * that. If a cygwin user *wants* to define 'PNG_USE_DLL' that's okay, but
91 * unnecessary.
92 *
93 * Also, the precedence order is:
94 *   ALL_STATIC (since we can't #undef something outside our namespace)
95 *   PNG_BUILD_DLL
96 *   PNG_STATIC
97 *   (nothing) == PNG_USE_DLL
98 *
99 * CYGWIN (2002-01-20): The preceding is now obsolete. With the advent
100 *   of auto-import in binutils, we no longer need to worry about
101 *   __declspec(dllexport) / __declspec(dllimport) and friends.  Therefore,
102 *   we don't need to worry about PNG_STATIC or ALL_STATIC when it comes
103 *   to __declspec() stuff.  However, we DO need to worry about
104 *   PNG_BUILD_DLL and PNG_STATIC because those change some defaults
105 *   such as CONSOLE_IO and whether GLOBAL_ARRAYS are allowed.
106 */
107#if defined(__CYGWIN__)
108#  if defined(ALL_STATIC)
109#    if defined(PNG_BUILD_DLL)
110#      undef PNG_BUILD_DLL
111#    endif
112#    if defined(PNG_USE_DLL)
113#      undef PNG_USE_DLL
114#    endif
115#    if defined(PNG_DLL)
116#      undef PNG_DLL
117#    endif
118#    if !defined(PNG_STATIC)
119#      define PNG_STATIC
120#    endif
121#  else
122#    if defined (PNG_BUILD_DLL)
123#      if defined(PNG_STATIC)
124#        undef PNG_STATIC
125#      endif
126#      if defined(PNG_USE_DLL)
127#        undef PNG_USE_DLL
128#      endif
129#      if !defined(PNG_DLL)
130#        define PNG_DLL
131#      endif
132#    else
133#      if defined(PNG_STATIC)
134#        if defined(PNG_USE_DLL)
135#          undef PNG_USE_DLL
136#        endif
137#        if defined(PNG_DLL)
138#          undef PNG_DLL
139#        endif
140#      else
141#        if !defined(PNG_USE_DLL)
142#          define PNG_USE_DLL
143#        endif
144#        if !defined(PNG_DLL)
145#          define PNG_DLL
146#        endif
147#      endif 
148#    endif 
149#  endif
150#endif
151
152/* This protects us against compilers that run on a windowing system
153 * and thus don't have or would rather us not use the stdio types:
154 * stdin, stdout, and stderr.  The only one currently used is stderr
155 * in png_error() and png_warning().  #defining PNG_NO_CONSOLE_IO will
156 * prevent these from being compiled and used. #defining PNG_NO_STDIO
157 * will also prevent these, plus will prevent the entire set of stdio
158 * macros and functions (FILE *, printf, etc.) from being compiled and used,
159 * unless (PNG_DEBUG > 0) has been #defined.
160 *
161 * #define PNG_NO_CONSOLE_IO
162 * #define PNG_NO_STDIO
163 */
164
165#if defined(_WIN32_WCE)
166#  include <windows.h>
167   /* Console I/O functions are not supported on WindowsCE */
168#  define PNG_NO_CONSOLE_IO
169#  ifdef PNG_DEBUG
170#    undef PNG_DEBUG
171#  endif
172#endif
173
174#ifdef PNG_BUILD_DLL
175#  ifndef PNG_CONSOLE_IO_SUPPORTED
176#    ifndef PNG_NO_CONSOLE_IO
177#      define PNG_NO_CONSOLE_IO
178#    endif
179#  endif
180#endif
181
182#  ifdef PNG_NO_STDIO
183#    ifndef PNG_NO_CONSOLE_IO
184#      define PNG_NO_CONSOLE_IO
185#    endif
186#    ifdef PNG_DEBUG
187#      if (PNG_DEBUG > 0)
188#        include <stdio.h>
189#      endif
190#    endif
191#  else
192#    if !defined(_WIN32_WCE)
193/* "stdio.h" functions are not supported on WindowsCE */
194#      include <stdio.h>
195#    endif
196#  endif
197
198/* This macro protects us against machines that don't have function
199 * prototypes (ie K&R style headers).  If your compiler does not handle
200 * function prototypes, define this macro and use the included ansi2knr.
201 * I've always been able to use _NO_PROTO as the indicator, but you may
202 * need to drag the empty declaration out in front of here, or change the
203 * ifdef to suit your own needs.
204 */
205#ifndef PNGARG
206
207#ifdef OF /* zlib prototype munger */
208#  define PNGARG(arglist) OF(arglist)
209#else
210
211#ifdef _NO_PROTO
212#  define PNGARG(arglist) ()
213#  ifndef PNG_TYPECAST_NULL
214#     define PNG_TYPECAST_NULL
215#  endif
216#else
217#  define PNGARG(arglist) arglist
218#endif /* _NO_PROTO */
219
220#endif /* OF */
221
222#endif /* PNGARG */
223
224/* Try to determine if we are compiling on a Mac.  Note that testing for
225 * just __MWERKS__ is not good enough, because the Codewarrior is now used
226 * on non-Mac platforms.
227 */
228#ifndef MACOS
229#  if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
230      defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
231#    define MACOS
232#  endif
233#endif
234
235/* enough people need this for various reasons to include it here */
236#if !defined(MACOS) && !defined(RISCOS) && !defined(_WIN32_WCE)
237#  include <sys/types.h>
238#endif
239
240#if !defined(PNG_SETJMP_NOT_SUPPORTED) && !defined(PNG_NO_SETJMP_SUPPORTED)
241#  define PNG_SETJMP_SUPPORTED
242#endif
243
244#ifdef PNG_SETJMP_SUPPORTED
245/* This is an attempt to force a single setjmp behaviour on Linux.  If
246 * the X config stuff didn't define _BSD_SOURCE we wouldn't need this.
247 */
248
249#  ifdef __linux__
250#    ifdef _BSD_SOURCE
251#      define PNG_SAVE_BSD_SOURCE
252#      undef _BSD_SOURCE
253#    endif
254#    ifdef _SETJMP_H
255      __png.h__ already includes setjmp.h;
256      __dont__ include it again.;
257#    endif
258#  endif /* __linux__ */
259
260   /* include setjmp.h for error handling */
261#  include <setjmp.h>
262
263#  ifdef __linux__
264#    ifdef PNG_SAVE_BSD_SOURCE
265#      define _BSD_SOURCE
266#      undef PNG_SAVE_BSD_SOURCE
267#    endif
268#  endif /* __linux__ */
269#endif /* PNG_SETJMP_SUPPORTED */
270
271#ifdef BSD
272#  include <strings.h>
273#else
274#  include <string.h>
275#endif
276
277/* Other defines for things like memory and the like can go here.  */
278#ifdef PNG_INTERNAL
279
280#include <stdlib.h>
281
282/* The functions exported by PNG_EXTERN are PNG_INTERNAL functions, which
283 * aren't usually used outside the library (as far as I know), so it is
284 * debatable if they should be exported at all.  In the future, when it is
285 * possible to have run-time registry of chunk-handling functions, some of
286 * these will be made available again.
287#define PNG_EXTERN extern
288 */
289#define PNG_EXTERN
290
291/* Other defines specific to compilers can go here.  Try to keep
292 * them inside an appropriate ifdef/endif pair for portability.
293 */
294
295#if defined(PNG_FLOATING_POINT_SUPPORTED)
296#  if defined(MACOS)
297     /* We need to check that <math.h> hasn't already been included earlier
298      * as it seems it doesn't agree with <fp.h>, yet we should really use
299      * <fp.h> if possible.
300      */
301#    if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
302#      include <fp.h>
303#    endif
304#  else
305#    include <math.h>
306#  endif
307#  if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
308     /* Amiga SAS/C: We must include builtin FPU functions when compiling using
309      * MATH=68881
310      */
311#    include <m68881.h>
312#  endif
313#endif
314
315/* Codewarrior on NT has linking problems without this. */
316#if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__)
317#  define PNG_ALWAYS_EXTERN
318#endif
319
320/* For some reason, Borland C++ defines memcmp, etc. in mem.h, not
321 * stdlib.h like it should (I think).  Or perhaps this is a C++
322 * "feature"?
323 */
324#ifdef __TURBOC__
325#  include <mem.h>
326#  include "alloc.h"
327#endif
328
329#if defined(_MSC_VER) && (defined(WIN32) || defined(_Windows) || \
330    defined(_WINDOWS) || defined(_WIN32) || defined(__WIN32__))
331#  include <malloc.h>
332#endif
333
334/* This controls how fine the dithering gets.  As this allocates
335 * a largish chunk of memory (32K), those who are not as concerned
336 * with dithering quality can decrease some or all of these.
337 */
338#ifndef PNG_DITHER_RED_BITS
339#  define PNG_DITHER_RED_BITS 5
340#endif
341#ifndef PNG_DITHER_GREEN_BITS
342#  define PNG_DITHER_GREEN_BITS 5
343#endif
344#ifndef PNG_DITHER_BLUE_BITS
345#  define PNG_DITHER_BLUE_BITS 5
346#endif
347
348/* This controls how fine the gamma correction becomes when you
349 * are only interested in 8 bits anyway.  Increasing this value
350 * results in more memory being used, and more pow() functions
351 * being called to fill in the gamma tables.  Don't set this value
352 * less then 8, and even that may not work (I haven't tested it).
353 */
354
355#ifndef PNG_MAX_GAMMA_8
356#  define PNG_MAX_GAMMA_8 11
357#endif
358
359/* This controls how much a difference in gamma we can tolerate before
360 * we actually start doing gamma conversion.
361 */
362#ifndef PNG_GAMMA_THRESHOLD
363#  define PNG_GAMMA_THRESHOLD 0.05
364#endif
365
366#endif /* PNG_INTERNAL */
367
368/* The following uses const char * instead of char * for error
369 * and warning message functions, so some compilers won't complain.
370 * If you do not want to use const, define PNG_NO_CONST here.
371 */
372
373#ifndef PNG_NO_CONST
374#  define PNG_CONST const
375#else
376#  define PNG_CONST
377#endif
378
379/* The following defines give you the ability to remove code from the
380 * library that you will not be using.  I wish I could figure out how to
381 * automate this, but I can't do that without making it seriously hard
382 * on the users.  So if you are not using an ability, change the #define
383 * to and #undef, and that part of the library will not be compiled.  If
384 * your linker can't find a function, you may want to make sure the
385 * ability is defined here.  Some of these depend upon some others being
386 * defined.  I haven't figured out all the interactions here, so you may
387 * have to experiment awhile to get everything to compile.  If you are
388 * creating or using a shared library, you probably shouldn't touch this,
389 * as it will affect the size of the structures, and this will cause bad
390 * things to happen if the library and/or application ever change.
391 */
392
393/* Any features you will not be using can be undef'ed here */
394
395/* GR-P, 0.96a: Set "*TRANSFORMS_SUPPORTED as default but allow user
396 * to turn it off with "*TRANSFORMS_NOT_SUPPORTED" or *PNG_NO_*_TRANSFORMS
397 * on the compile line, then pick and choose which ones to define without
398 * having to edit this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED
399 * if you only want to have a png-compliant reader/writer but don't need
400 * any of the extra transformations.  This saves about 80 kbytes in a
401 * typical installation of the library. (PNG_NO_* form added in version
402 * 1.0.1c, for consistency)
403 */
404
405/* The size of the png_text structure changed in libpng-1.0.6 when
406 * iTXt is supported.  It is turned off by default, to support old apps
407 * that malloc the png_text structure instead of calling png_set_text()
408 * and letting libpng malloc it.  It will be turned on by default in
409 * libpng-1.3.0.
410 */
411
412#ifndef PNG_iTXt_SUPPORTED
413#  if !defined(PNG_READ_iTXt_SUPPORTED) && !defined(PNG_NO_READ_iTXt)
414#    define PNG_NO_READ_iTXt
415#  endif
416#  if !defined(PNG_WRITE_iTXt_SUPPORTED) && !defined(PNG_NO_WRITE_iTXt)
417#    define PNG_NO_WRITE_iTXt
418#  endif
419#endif
420
421/* The following support, added after version 1.0.0, can be turned off here en
422 * masse by defining PNG_LEGACY_SUPPORTED in case you need binary compatibility
423 * with old applications that require the length of png_struct and png_info
424 * to remain unchanged.
425 */
426
427#ifdef PNG_LEGACY_SUPPORTED
428#  define PNG_NO_FREE_ME
429#  define PNG_NO_READ_UNKNOWN_CHUNKS
430#  define PNG_NO_WRITE_UNKNOWN_CHUNKS
431#  define PNG_NO_READ_USER_CHUNKS
432#  define PNG_NO_READ_iCCP
433#  define PNG_NO_WRITE_iCCP
434#  define PNG_NO_READ_iTXt
435#  define PNG_NO_WRITE_iTXt
436#  define PNG_NO_READ_sCAL
437#  define PNG_NO_WRITE_sCAL
438#  define PNG_NO_READ_sPLT
439#  define PNG_NO_WRITE_sPLT
440#  define PNG_NO_INFO_IMAGE
441#  define PNG_NO_READ_RGB_TO_GRAY
442#  define PNG_NO_READ_USER_TRANSFORM
443#  define PNG_NO_WRITE_USER_TRANSFORM
444#  define PNG_NO_USER_MEM
445#  define PNG_NO_READ_EMPTY_PLTE
446#  define PNG_NO_MNG_FEATURES
447#  define PNG_NO_FIXED_POINT_SUPPORTED
448#endif
449
450/* Ignore attempt to turn off both floating and fixed point support */
451#if !defined(PNG_FLOATING_POINT_SUPPORTED) || \
452    !defined(PNG_NO_FIXED_POINT_SUPPORTED)
453#  define PNG_FIXED_POINT_SUPPORTED
454#endif
455
456#ifndef PNG_NO_FREE_ME
457#  define PNG_FREE_ME_SUPPORTED
458#endif
459
460#if defined(PNG_READ_SUPPORTED)
461
462#if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \
463      !defined(PNG_NO_READ_TRANSFORMS)
464#  define PNG_READ_TRANSFORMS_SUPPORTED
465#endif
466
467#ifdef PNG_READ_TRANSFORMS_SUPPORTED
468#  ifndef PNG_NO_READ_EXPAND
469#    define PNG_READ_EXPAND_SUPPORTED
470#  endif
471#  ifndef PNG_NO_READ_SHIFT
472#    define PNG_READ_SHIFT_SUPPORTED
473#  endif
474#  ifndef PNG_NO_READ_PACK
475#    define PNG_READ_PACK_SUPPORTED
476#  endif
477#  ifndef PNG_NO_READ_BGR
478#    define PNG_READ_BGR_SUPPORTED
479#  endif
480#  ifndef PNG_NO_READ_SWAP
481#    define PNG_READ_SWAP_SUPPORTED
482#  endif
483#  ifndef PNG_NO_READ_PACKSWAP
484#    define PNG_READ_PACKSWAP_SUPPORTED
485#  endif
486#  ifndef PNG_NO_READ_INVERT
487#    define PNG_READ_INVERT_SUPPORTED
488#  endif
489#  ifndef PNG_NO_READ_DITHER
490#    define PNG_READ_DITHER_SUPPORTED
491#  endif
492#  ifndef PNG_NO_READ_BACKGROUND
493#    define PNG_READ_BACKGROUND_SUPPORTED
494#  endif
495#  ifndef PNG_NO_READ_16_TO_8
496#    define PNG_READ_16_TO_8_SUPPORTED
497#  endif
498#  ifndef PNG_NO_READ_FILLER
499#    define PNG_READ_FILLER_SUPPORTED
500#  endif
501#  ifndef PNG_NO_READ_GAMMA
502#    define PNG_READ_GAMMA_SUPPORTED
503#  endif
504#  ifndef PNG_NO_READ_GRAY_TO_RGB
505#    define PNG_READ_GRAY_TO_RGB_SUPPORTED
506#  endif
507#  ifndef PNG_NO_READ_SWAP_ALPHA
508#    define PNG_READ_SWAP_ALPHA_SUPPORTED
509#  endif
510#  ifndef PNG_NO_READ_INVERT_ALPHA
511#    define PNG_READ_INVERT_ALPHA_SUPPORTED
512#  endif
513#  ifndef PNG_NO_READ_STRIP_ALPHA
514#    define PNG_READ_STRIP_ALPHA_SUPPORTED
515#  endif
516#  ifndef PNG_NO_READ_USER_TRANSFORM
517#    define PNG_READ_USER_TRANSFORM_SUPPORTED
518#  endif
519#  ifndef PNG_NO_READ_RGB_TO_GRAY
520#    define PNG_READ_RGB_TO_GRAY_SUPPORTED
521#  endif
522#endif /* PNG_READ_TRANSFORMS_SUPPORTED */
523
524#if !defined(PNG_NO_PROGRESSIVE_READ) && \
525 !defined(PNG_PROGRESSIVE_READ_NOT_SUPPORTED)  /* if you don't do progressive */
526#  define PNG_PROGRESSIVE_READ_SUPPORTED     /* reading.  This is not talking */
527#endif                               /* about interlacing capability!  You'll */
528              /* still have interlacing unless you change the following line: */
529
530#define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */
531
532#ifndef PNG_NO_READ_COMPOSITE_NODIV
533#  ifndef PNG_NO_READ_COMPOSITED_NODIV  /* libpng-1.0.x misspelling */
534#    define PNG_READ_COMPOSITE_NODIV_SUPPORTED   /* well tested on Intel, SGI */
535#  endif
536#endif
537
538/* Deprecated, will be removed from version 2.0.0.
539   Use PNG_MNG_FEATURES_SUPPORTED instead. */
540#ifndef PNG_NO_READ_EMPTY_PLTE
541#  define PNG_READ_EMPTY_PLTE_SUPPORTED
542#endif
543
544#endif /* PNG_READ_SUPPORTED */
545
546#if defined(PNG_WRITE_SUPPORTED)
547
548# if !defined(PNG_WRITE_TRANSFORMS_NOT_SUPPORTED) && \
549    !defined(PNG_NO_WRITE_TRANSFORMS)
550#  define PNG_WRITE_TRANSFORMS_SUPPORTED
551#endif
552
553#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
554#  ifndef PNG_NO_WRITE_SHIFT
555#    define PNG_WRITE_SHIFT_SUPPORTED
556#  endif
557#  ifndef PNG_NO_WRITE_PACK
558#    define PNG_WRITE_PACK_SUPPORTED
559#  endif
560#  ifndef PNG_NO_WRITE_BGR
561#    define PNG_WRITE_BGR_SUPPORTED
562#  endif
563#  ifndef PNG_NO_WRITE_SWAP
564#    define PNG_WRITE_SWAP_SUPPORTED
565#  endif
566#  ifndef PNG_NO_WRITE_PACKSWAP
567#    define PNG_WRITE_PACKSWAP_SUPPORTED
568#  endif
569#  ifndef PNG_NO_WRITE_INVERT
570#    define PNG_WRITE_INVERT_SUPPORTED
571#  endif
572#  ifndef PNG_NO_WRITE_FILLER
573#    define PNG_WRITE_FILLER_SUPPORTED   /* same as WRITE_STRIP_ALPHA */
574#  endif
575#  ifndef PNG_NO_WRITE_SWAP_ALPHA
576#    define PNG_WRITE_SWAP_ALPHA_SUPPORTED
577#  endif
578#  ifndef PNG_NO_WRITE_INVERT_ALPHA
579#    define PNG_WRITE_INVERT_ALPHA_SUPPORTED
580#  endif
581#  ifndef PNG_NO_WRITE_USER_TRANSFORM
582#    define PNG_WRITE_USER_TRANSFORM_SUPPORTED
583#  endif
584#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */
585
586#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
587    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
588#  ifndef PNG_NO_USER_TRANSFORM_PTR
589#    define PNG_USER_TRANSFORM_PTR_SUPPORTED
590#  endif
591#endif
592
593#define PNG_WRITE_INTERLACING_SUPPORTED  /* not required for PNG-compliant
594                                            encoders, but can cause trouble
595                                            if left undefined */
596
597#if !defined(PNG_NO_WRITE_WEIGHTED_FILTER) && \
598     defined(PNG_FLOATING_POINT_SUPPORTED)
599#  define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
600#endif
601
602#ifndef PNG_1_0_X
603#ifndef PNG_NO_ERROR_NUMBERS
604#define PNG_ERROR_NUMBERS_SUPPORTED
605#endif
606#endif /* PNG_1_0_X */
607
608#ifndef PNG_NO_WRITE_FLUSH
609#  define PNG_WRITE_FLUSH_SUPPORTED
610#endif
611
612/* Deprecated, see PNG_MNG_FEATURES_SUPPORTED, above */
613#ifndef PNG_NO_WRITE_EMPTY_PLTE
614#  define PNG_WRITE_EMPTY_PLTE_SUPPORTED
615#endif
616
617#endif /* PNG_WRITE_SUPPORTED */
618
619#ifndef PNG_NO_STDIO
620#  define PNG_TIME_RFC1123_SUPPORTED
621#endif
622
623/* This adds extra functions in pngget.c for accessing data from the
624 * info pointer (added in version 0.99)
625 * png_get_image_width()
626 * png_get_image_height()
627 * png_get_bit_depth()
628 * png_get_color_type()
629 * png_get_compression_type()
630 * png_get_filter_type()
631 * png_get_interlace_type()
632 * png_get_pixel_aspect_ratio()
633 * png_get_pixels_per_meter()
634 * png_get_x_offset_pixels()
635 * png_get_y_offset_pixels()
636 * png_get_x_offset_microns()
637 * png_get_y_offset_microns()
638 */
639#if !defined(PNG_NO_EASY_ACCESS) && !defined(PNG_EASY_ACCESS_SUPPORTED)
640#  define PNG_EASY_ACCESS_SUPPORTED
641#endif
642
643/* PNG_ASSEMBLER_CODE was enabled by default in version 1.2.0
644   even when PNG_USE_PNGVCRD or PNG_USE_PNGGCCRD is not defined */
645#if defined(PNG_READ_SUPPORTED) && !defined(PNG_NO_ASSEMBLER_CODE)
646#  ifndef PNG_ASSEMBLER_CODE_SUPPORTED
647#    define PNG_ASSEMBLER_CODE_SUPPORTED
648#  endif
649#  if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
650#    define PNG_MMX_CODE_SUPPORTED
651#  endif
652#endif
653
654/* If you are sure that you don't need thread safety and you are compiling
655   with PNG_USE_PNGCCRD for an MMX application, you can define this for
656   faster execution.  See pnggccrd.c.
657#define PNG_THREAD_UNSAFE_OK
658*/
659
660#if !defined(PNG_1_0_X)
661#if !defined(PNG_NO_USER_MEM) && !defined(PNG_USER_MEM_SUPPORTED)
662#  define PNG_USER_MEM_SUPPORTED
663#endif
664#endif /* PNG_1_0_X */
665
666#ifndef PNG_USER_WIDTH_MAX
667#  define PNG_USER_WIDTH_MAX 1000000L
668#endif
669#ifndef PNG_USER_HEIGHT_MAX
670#  define PNG_USER_HEIGHT_MAX 1000000L
671#endif
672
673/* These are currently experimental features, define them if you want */
674
675/* very little testing */
676/*
677#ifdef PNG_READ_SUPPORTED
678#  ifndef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
679#    define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
680#  endif
681#endif
682*/
683
684/* This is only for PowerPC big-endian and 680x0 systems */
685/* some testing */
686/*
687#ifdef PNG_READ_SUPPORTED
688#  ifndef PNG_PNG_READ_BIG_ENDIAN_SUPPORTED
689#    define PNG_READ_BIG_ENDIAN_SUPPORTED
690#  endif
691#endif
692*/
693
694/* Buggy compilers (e.g., gcc 2.7.2.2) need this */
695/*
696#define PNG_NO_POINTER_INDEXING
697*/
698
699/* These functions are turned off by default, as they will be phased out. */
700/*
701#define  PNG_USELESS_TESTS_SUPPORTED
702#define  PNG_CORRECT_PALETTE_SUPPORTED
703*/
704
705/* Any chunks you are not interested in, you can undef here.  The
706 * ones that allocate memory may be expecially important (hIST,
707 * tEXt, zTXt, tRNS, pCAL).  Others will just save time and make png_info
708 * a bit smaller.
709 */
710
711#if defined(PNG_READ_SUPPORTED) && \
712    !defined(PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
713    !defined(PNG_NO_READ_ANCILLARY_CHUNKS)
714#  define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
715#endif
716
717#if defined(PNG_WRITE_SUPPORTED) && \
718    !defined(PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
719    !defined(PNG_NO_WRITE_ANCILLARY_CHUNKS)
720#  define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
721#endif
722
723#ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
724
725#ifdef PNG_NO_READ_TEXT
726#  define PNG_NO_READ_iTXt
727#  define PNG_NO_READ_tEXt
728#  define PNG_NO_READ_zTXt
729#endif
730#ifndef PNG_NO_READ_bKGD
731#  define PNG_READ_bKGD_SUPPORTED
732#  define PNG_bKGD_SUPPORTED
733#endif
734#ifndef PNG_NO_READ_cHRM
735#  define PNG_READ_cHRM_SUPPORTED
736#  define PNG_cHRM_SUPPORTED
737#endif
738#ifndef PNG_NO_READ_gAMA
739#  define PNG_READ_gAMA_SUPPORTED
740#  define PNG_gAMA_SUPPORTED
741#endif
742#ifndef PNG_NO_READ_hIST
743#  define PNG_READ_hIST_SUPPORTED
744#  define PNG_hIST_SUPPORTED
745#endif
746#ifndef PNG_NO_READ_iCCP
747#  define PNG_READ_iCCP_SUPPORTED
748#  define PNG_iCCP_SUPPORTED
749#endif
750#ifndef PNG_NO_READ_iTXt
751#  ifndef PNG_READ_iTXt_SUPPORTED
752#    define PNG_READ_iTXt_SUPPORTED
753#  endif
754#  ifndef PNG_iTXt_SUPPORTED
755#    define PNG_iTXt_SUPPORTED
756#  endif
757#endif
758#ifndef PNG_NO_READ_oFFs
759#  define PNG_READ_oFFs_SUPPORTED
760#  define PNG_oFFs_SUPPORTED
761#endif
762#ifndef PNG_NO_READ_pCAL
763#  define PNG_READ_pCAL_SUPPORTED
764#  define PNG_pCAL_SUPPORTED
765#endif
766#ifndef PNG_NO_READ_sCAL
767#  define PNG_READ_sCAL_SUPPORTED
768#  define PNG_sCAL_SUPPORTED
769#endif
770#ifndef PNG_NO_READ_pHYs
771#  define PNG_READ_pHYs_SUPPORTED
772#  define PNG_pHYs_SUPPORTED
773#endif
774#ifndef PNG_NO_READ_sBIT
775#  define PNG_READ_sBIT_SUPPORTED
776#  define PNG_sBIT_SUPPORTED
777#endif
778#ifndef PNG_NO_READ_sPLT
779#  define PNG_READ_sPLT_SUPPORTED
780#  define PNG_sPLT_SUPPORTED
781#endif
782#ifndef PNG_NO_READ_sRGB
783#  define PNG_READ_sRGB_SUPPORTED
784#  define PNG_sRGB_SUPPORTED
785#endif
786#ifndef PNG_NO_READ_tEXt
787#  define PNG_READ_tEXt_SUPPORTED
788#  define PNG_tEXt_SUPPORTED
789#endif
790#ifndef PNG_NO_READ_tIME
791#  define PNG_READ_tIME_SUPPORTED
792#  define PNG_tIME_SUPPORTED
793#endif
794#ifndef PNG_NO_READ_tRNS
795#  define PNG_READ_tRNS_SUPPORTED
796#  define PNG_tRNS_SUPPORTED
797#endif
798#ifndef PNG_NO_READ_zTXt
799#  define PNG_READ_zTXt_SUPPORTED
800#  define PNG_zTXt_SUPPORTED
801#endif
802#ifndef PNG_NO_READ_UNKNOWN_CHUNKS
803#  define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
804#  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
805#    define PNG_UNKNOWN_CHUNKS_SUPPORTED
806#  endif
807#  ifndef PNG_NO_HANDLE_AS_UNKNOWN
808#    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
809#  endif
810#endif
811#if !defined(PNG_NO_READ_USER_CHUNKS) && \
812     defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
813#  define PNG_READ_USER_CHUNKS_SUPPORTED
814#  define PNG_USER_CHUNKS_SUPPORTED
815#  ifdef PNG_NO_READ_UNKNOWN_CHUNKS
816#    undef PNG_NO_READ_UNKNOWN_CHUNKS
817#  endif
818#  ifdef PNG_NO_HANDLE_AS_UNKNOWN
819#    undef PNG_NO_HANDLE_AS_UNKNOWN
820#  endif
821#endif
822#ifndef PNG_NO_READ_OPT_PLTE
823#  define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */
824#endif                      /* optional PLTE chunk in RGB and RGBA images */
825#if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
826    defined(PNG_READ_zTXt_SUPPORTED)
827#  define PNG_READ_TEXT_SUPPORTED
828#  define PNG_TEXT_SUPPORTED
829#endif
830
831#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
832
833#ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
834
835#ifdef PNG_NO_WRITE_TEXT
836#  define PNG_NO_WRITE_iTXt
837#  define PNG_NO_WRITE_tEXt
838#  define PNG_NO_WRITE_zTXt
839#endif
840#ifndef PNG_NO_WRITE_bKGD
841#  define PNG_WRITE_bKGD_SUPPORTED
842#  ifndef PNG_bKGD_SUPPORTED
843#    define PNG_bKGD_SUPPORTED
844#  endif
845#endif
846#ifndef PNG_NO_WRITE_cHRM
847#  define PNG_WRITE_cHRM_SUPPORTED
848#  ifndef PNG_cHRM_SUPPORTED
849#    define PNG_cHRM_SUPPORTED
850#  endif
851#endif
852#ifndef PNG_NO_WRITE_gAMA
853#  define PNG_WRITE_gAMA_SUPPORTED
854#  ifndef PNG_gAMA_SUPPORTED
855#    define PNG_gAMA_SUPPORTED
856#  endif
857#endif
858#ifndef PNG_NO_WRITE_hIST
859#  define PNG_WRITE_hIST_SUPPORTED
860#  ifndef PNG_hIST_SUPPORTED
861#    define PNG_hIST_SUPPORTED
862#  endif
863#endif
864#ifndef PNG_NO_WRITE_iCCP
865#  define PNG_WRITE_iCCP_SUPPORTED
866#  ifndef PNG_iCCP_SUPPORTED
867#    define PNG_iCCP_SUPPORTED
868#  endif
869#endif
870#ifndef PNG_NO_WRITE_iTXt
871#  ifndef PNG_WRITE_iTXt_SUPPORTED
872#    define PNG_WRITE_iTXt_SUPPORTED
873#  endif
874#  ifndef PNG_iTXt_SUPPORTED
875#    define PNG_iTXt_SUPPORTED
876#  endif
877#endif
878#ifndef PNG_NO_WRITE_oFFs
879#  define PNG_WRITE_oFFs_SUPPORTED
880#  ifndef PNG_oFFs_SUPPORTED
881#    define PNG_oFFs_SUPPORTED
882#  endif
883#endif
884#ifndef PNG_NO_WRITE_pCAL
885#  define PNG_WRITE_pCAL_SUPPORTED
886#  ifndef PNG_pCAL_SUPPORTED
887#    define PNG_pCAL_SUPPORTED
888#  endif
889#endif
890#ifndef PNG_NO_WRITE_sCAL
891#  define PNG_WRITE_sCAL_SUPPORTED
892#  ifndef PNG_sCAL_SUPPORTED
893#    define PNG_sCAL_SUPPORTED
894#  endif
895#endif
896#ifndef PNG_NO_WRITE_pHYs
897#  define PNG_WRITE_pHYs_SUPPORTED
898#  ifndef PNG_pHYs_SUPPORTED
899#    define PNG_pHYs_SUPPORTED
900#  endif
901#endif
902#ifndef PNG_NO_WRITE_sBIT
903#  define PNG_WRITE_sBIT_SUPPORTED
904#  ifndef PNG_sBIT_SUPPORTED
905#    define PNG_sBIT_SUPPORTED
906#  endif
907#endif
908#ifndef PNG_NO_WRITE_sPLT
909#  define PNG_WRITE_sPLT_SUPPORTED
910#  ifndef PNG_sPLT_SUPPORTED
911#    define PNG_sPLT_SUPPORTED
912#  endif
913#endif
914#ifndef PNG_NO_WRITE_sRGB
915#  define PNG_WRITE_sRGB_SUPPORTED
916#  ifndef PNG_sRGB_SUPPORTED
917#    define PNG_sRGB_SUPPORTED
918#  endif
919#endif
920#ifndef PNG_NO_WRITE_tEXt
921#  define PNG_WRITE_tEXt_SUPPORTED
922#  ifndef PNG_tEXt_SUPPORTED
923#    define PNG_tEXt_SUPPORTED
924#  endif
925#endif
926#ifndef PNG_NO_WRITE_tIME
927#  define PNG_WRITE_tIME_SUPPORTED
928#  ifndef PNG_tIME_SUPPORTED
929#    define PNG_tIME_SUPPORTED
930#  endif
931#endif
932#ifndef PNG_NO_WRITE_tRNS
933#  define PNG_WRITE_tRNS_SUPPORTED
934#  ifndef PNG_tRNS_SUPPORTED
935#    define PNG_tRNS_SUPPORTED
936#  endif
937#endif
938#ifndef PNG_NO_WRITE_zTXt
939#  define PNG_WRITE_zTXt_SUPPORTED
940#  ifndef PNG_zTXt_SUPPORTED
941#    define PNG_zTXt_SUPPORTED
942#  endif
943#endif
944#ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
945#  define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
946#  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
947#    define PNG_UNKNOWN_CHUNKS_SUPPORTED
948#  endif
949#  ifndef PNG_NO_HANDLE_AS_UNKNOWN
950#     ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
951#       define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
952#     endif
953#  endif
954#endif
955#if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
956    defined(PNG_WRITE_zTXt_SUPPORTED)
957#  define PNG_WRITE_TEXT_SUPPORTED
958#  ifndef PNG_TEXT_SUPPORTED
959#    define PNG_TEXT_SUPPORTED
960#  endif
961#endif
962
963#endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
964
965/* Turn this off to disable png_read_png() and
966 * png_write_png() and leave the row_pointers member
967 * out of the info structure.
968 */
969#ifndef PNG_NO_INFO_IMAGE
970#  define PNG_INFO_IMAGE_SUPPORTED
971#endif
972
973/* need the time information for reading tIME chunks */
974#if defined(PNG_tIME_SUPPORTED)
975#  if !defined(_WIN32_WCE)
976     /* "time.h" functions are not supported on WindowsCE */
977#    include <time.h>
978#  endif
979#endif
980
981/* Some typedefs to get us started.  These should be safe on most of the
982 * common platforms.  The typedefs should be at least as large as the
983 * numbers suggest (a png_uint_32 must be at least 32 bits long), but they
984 * don't have to be exactly that size.  Some compilers dislike passing
985 * unsigned shorts as function parameters, so you may be better off using
986 * unsigned int for png_uint_16.  Likewise, for 64-bit systems, you may
987 * want to have unsigned int for png_uint_32 instead of unsigned long.
988 */
989
990typedef unsigned long png_uint_32;
991typedef long png_int_32;
992typedef unsigned short png_uint_16;
993typedef short png_int_16;
994typedef unsigned char png_byte;
995
996/* This is usually size_t.  It is typedef'ed just in case you need it to
997   change (I'm not sure if you will or not, so I thought I'd be safe) */
998typedef size_t png_size_t;
999
1000/* The following is needed for medium model support.  It cannot be in the
1001 * PNG_INTERNAL section.  Needs modification for other compilers besides
1002 * MSC.  Model independent support declares all arrays and pointers to be
1003 * large using the far keyword.  The zlib version used must also support
1004 * model independent data.  As of version zlib 1.0.4, the necessary changes
1005 * have been made in zlib.  The USE_FAR_KEYWORD define triggers other
1006 * changes that are needed. (Tim Wegner)
1007 */
1008
1009/* Separate compiler dependencies (problem here is that zlib.h always
1010   defines FAR. (SJT) */
1011#ifdef __BORLANDC__
1012#  if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__)
1013#    define LDATA 1
1014#  else
1015#    define LDATA 0
1016#  endif
1017   /* GRR:  why is Cygwin in here?  Cygwin is not Borland C... */
1018#  if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__)
1019#    define PNG_MAX_MALLOC_64K
1020#    if (LDATA != 1)
1021#      ifndef FAR
1022#        define FAR __far
1023#      endif
1024#      define USE_FAR_KEYWORD
1025#    endif   /* LDATA != 1 */
1026     /* Possibly useful for moving data out of default segment.
1027      * Uncomment it if you want. Could also define FARDATA as
1028      * const if your compiler supports it. (SJT)
1029#    define FARDATA FAR
1030      */
1031#  endif  /* __WIN32__, __FLAT__, __CYGWIN__ */
1032#endif   /* __BORLANDC__ */
1033
1034
1035/* Suggest testing for specific compiler first before testing for
1036 * FAR.  The Watcom compiler defines both __MEDIUM__ and M_I86MM,
1037 * making reliance oncertain keywords suspect. (SJT)
1038 */
1039
1040/* MSC Medium model */
1041#if defined(FAR)
1042#  if defined(M_I86MM)
1043#    define USE_FAR_KEYWORD
1044#    define FARDATA FAR
1045#    include <dos.h>
1046#  endif
1047#endif
1048
1049/* SJT: default case */
1050#ifndef FAR
1051#  define FAR
1052#endif
1053
1054/* At this point FAR is always defined */
1055#ifndef FARDATA
1056#  define FARDATA
1057#endif
1058
1059/* Typedef for floating-point numbers that are converted
1060   to fixed-point with a multiple of 100,000, e.g., int_gamma */
1061typedef png_int_32 png_fixed_point;
1062
1063/* Add typedefs for pointers */
1064typedef void            FAR * png_voidp;
1065typedef png_byte        FAR * png_bytep;
1066typedef png_uint_32     FAR * png_uint_32p;
1067typedef png_int_32      FAR * png_int_32p;
1068typedef png_uint_16     FAR * png_uint_16p;
1069typedef png_int_16      FAR * png_int_16p;
1070typedef PNG_CONST char  FAR * png_const_charp;
1071typedef char            FAR * png_charp;
1072typedef png_fixed_point FAR * png_fixed_point_p;
1073
1074#ifndef PNG_NO_STDIO
1075#if defined(_WIN32_WCE)
1076typedef HANDLE                png_FILE_p;
1077#else
1078typedef FILE                * png_FILE_p;
1079#endif
1080#endif
1081
1082#ifdef PNG_FLOATING_POINT_SUPPORTED
1083typedef double          FAR * png_doublep;
1084#endif
1085
1086/* Pointers to pointers; i.e. arrays */
1087typedef png_byte        FAR * FAR * png_bytepp;
1088typedef png_uint_32     FAR * FAR * png_uint_32pp;
1089typedef png_int_32      FAR * FAR * png_int_32pp;
1090typedef png_uint_16     FAR * FAR * png_uint_16pp;
1091typedef png_int_16      FAR * FAR * png_int_16pp;
1092typedef PNG_CONST char  FAR * FAR * png_const_charpp;
1093typedef char            FAR * FAR * png_charpp;
1094typedef png_fixed_point FAR * FAR * png_fixed_point_pp;
1095#ifdef PNG_FLOATING_POINT_SUPPORTED
1096typedef double          FAR * FAR * png_doublepp;
1097#endif
1098
1099/* Pointers to pointers to pointers; i.e., pointer to array */
1100typedef char            FAR * FAR * FAR * png_charppp;
1101
1102/* libpng typedefs for types in zlib. If zlib changes
1103 * or another compression library is used, then change these.
1104 * Eliminates need to change all the source files.
1105 */
1106typedef charf *         png_zcharp;
1107typedef charf * FAR *   png_zcharpp;
1108typedef z_stream FAR *  png_zstreamp;
1109
1110/*
1111 * Define PNG_BUILD_DLL if the module being built is a Windows
1112 * LIBPNG DLL.
1113 *
1114 * Define PNG_USE_DLL if you want to *link* to the Windows LIBPNG DLL.
1115 * It is equivalent to Microsoft predefined macro _DLL that is
1116 * automatically defined when you compile using the share
1117 * version of the CRT (C Run-Time library)
1118 *
1119 * The cygwin mods make this behavior a little different:
1120 * Define PNG_BUILD_DLL if you are building a dll for use with cygwin
1121 * Define PNG_STATIC if you are building a static library for use with cygwin,
1122 *   -or- if you are building an application that you want to link to the
1123 *   static library.
1124 * PNG_USE_DLL is defined by default (no user action needed) unless one of
1125 *   the other flags is defined.
1126 */
1127
1128#if !defined(PNG_DLL) && (defined(PNG_BUILD_DLL) || defined(PNG_USE_DLL))
1129#  define PNG_DLL
1130#endif
1131/* If CYGWIN, then disallow GLOBAL ARRAYS unless building a static lib.
1132 * When building a static lib, default to no GLOBAL ARRAYS, but allow
1133 * command-line override
1134 */
1135#if defined(__CYGWIN__)
1136#  if !defined(PNG_STATIC)
1137#    if defined(PNG_USE_GLOBAL_ARRAYS)
1138#      undef PNG_USE_GLOBAL_ARRAYS
1139#    endif
1140#    if !defined(PNG_USE_LOCAL_ARRAYS)
1141#      define PNG_USE_LOCAL_ARRAYS
1142#    endif
1143#  else
1144#    if defined(PNG_USE_LOCAL_ARRAYS) || defined(PNG_NO_GLOBAL_ARRAYS)
1145#      if defined(PNG_USE_GLOBAL_ARRAYS)
1146#        undef PNG_USE_GLOBAL_ARRAYS
1147#      endif
1148#    endif
1149#  endif
1150#  if !defined(PNG_USE_LOCAL_ARRAYS) && !defined(PNG_USE_GLOBAL_ARRAYS)
1151#    define PNG_USE_LOCAL_ARRAYS
1152#  endif
1153#endif
1154
1155/* Do not use global arrays (helps with building DLL's)
1156 * They are no longer used in libpng itself, since version 1.0.5c,
1157 * but might be required for some pre-1.0.5c applications.
1158 */
1159#if !defined(PNG_USE_LOCAL_ARRAYS) && !defined(PNG_USE_GLOBAL_ARRAYS)
1160#  if defined(PNG_NO_GLOBAL_ARRAYS) || (defined(__GNUC__) && defined(PNG_DLL))
1161#    define PNG_USE_LOCAL_ARRAYS
1162#  else
1163#    define PNG_USE_GLOBAL_ARRAYS
1164#  endif
1165#endif
1166
1167#if defined(__CYGWIN__)
1168#  undef PNGAPI
1169#  define PNGAPI __cdecl
1170#  undef PNG_IMPEXP
1171#  define PNG_IMPEXP
1172#endif 
1173
1174/* If you define PNGAPI, e.g., with compiler option "-DPNGAPI=__stdcall",
1175 * you may get warnings regarding the linkage of png_zalloc and png_zfree.
1176 * Don't ignore those warnings; you must also reset the default calling
1177 * convention in your compiler to match your PNGAPI, and you must build
1178 * zlib and your applications the same way you build libpng.
1179 */
1180
1181#ifndef PNGAPI
1182
1183#if defined(__MINGW32__) && !defined(PNG_MODULEDEF)
1184#  ifndef PNG_NO_MODULEDEF
1185#    define PNG_NO_MODULEDEF
1186#  endif
1187#endif
1188
1189#if !defined(PNG_IMPEXP) && defined(PNG_BUILD_DLL) && !defined(PNG_NO_MODULEDEF)
1190#  define PNG_IMPEXP
1191#endif
1192
1193#if defined(PNG_DLL) || defined(_DLL) || defined(__DLL__ ) || \
1194    (( defined(_Windows) || defined(_WINDOWS) || \
1195       defined(WIN32) || defined(_WIN32) || defined(__WIN32__) ))
1196
1197#  if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
1198#    define PNGAPI __cdecl
1199#  else
1200#    define PNGAPI _cdecl
1201#  endif
1202
1203#  if !defined(PNG_IMPEXP) && (!defined(PNG_DLL) || \
1204       0 /* WINCOMPILER_WITH_NO_SUPPORT_FOR_DECLIMPEXP */)
1205#     define PNG_IMPEXP
1206#  endif
1207
1208#  if !defined(PNG_IMPEXP)
1209
1210#     define PNG_EXPORT_TYPE1(type,symbol)  PNG_IMPEXP type PNGAPI symbol
1211#     define PNG_EXPORT_TYPE2(type,symbol)  type PNG_IMPEXP PNGAPI symbol
1212
1213      /* Borland/Microsoft */
1214#     if defined(_MSC_VER) || defined(__BORLANDC__)
1215#        if (_MSC_VER >= 800) || (__BORLANDC__ >= 0x500)
1216#           define PNG_EXPORT PNG_EXPORT_TYPE1
1217#        else
1218#           define PNG_EXPORT PNG_EXPORT_TYPE2
1219#           if defined(PNG_BUILD_DLL)
1220#              define PNG_IMPEXP __export
1221#           else
1222#              define PNG_IMPEXP /*__import */ /* doesn't exist AFAIK in
1223                                                 VC++ */
1224#           endif                             /* Exists in Borland C++ for
1225                                                 C++ classes (== huge) */
1226#        endif
1227#     endif
1228
1229#     if !defined(PNG_IMPEXP)
1230#        if defined(PNG_BUILD_DLL)
1231#           define PNG_IMPEXP __declspec(dllexport)
1232#        else
1233#           define PNG_IMPEXP __declspec(dllimport)
1234#        endif
1235#     endif
1236#  endif  /* PNG_IMPEXP */
1237#else /* !(DLL || non-cygwin WINDOWS) */
1238#    if (defined(__IBMC__) || defined(IBMCPP__)) && defined(__OS2__)
1239#      define PNGAPI _System
1240#      define PNG_IMPEXP
1241#    else
1242#      if 0 /* ... other platforms, with other meanings */
1243#      else
1244#        define PNGAPI
1245#        define PNG_IMPEXP
1246#      endif
1247#    endif
1248#endif
1249#endif
1250
1251#ifndef PNGAPI
1252#  define PNGAPI
1253#endif
1254#ifndef PNG_IMPEXP
1255#  define PNG_IMPEXP
1256#endif
1257
1258#ifndef PNG_EXPORT
1259#  define PNG_EXPORT(type,symbol) PNG_IMPEXP type PNGAPI symbol
1260#endif
1261
1262#ifdef PNG_USE_GLOBAL_ARRAYS
1263#  ifndef PNG_EXPORT_VAR
1264#    define PNG_EXPORT_VAR(type) extern PNG_IMPEXP type
1265#  endif
1266#endif
1267
1268/* User may want to use these so they are not in PNG_INTERNAL. Any library
1269 * functions that are passed far data must be model independent.
1270 */
1271
1272#ifndef PNG_ABORT
1273#  define PNG_ABORT() abort()
1274#endif
1275
1276#ifdef PNG_SETJMP_SUPPORTED
1277#  define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
1278#else
1279#  define png_jmpbuf(png_ptr) \
1280   (LIBPNG_WAS_COMPILED_WITH__PNG_SETJMP_NOT_SUPPORTED)
1281#endif
1282
1283#if defined(USE_FAR_KEYWORD)  /* memory model independent fns */
1284/* use this to make far-to-near assignments */
1285#  define CHECK   1
1286#  define NOCHECK 0
1287#  define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
1288#  define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
1289#  define png_strcpy _fstrcpy
1290#  define png_strncpy _fstrncpy    /* Added to v 1.2.6 */
1291#  define png_strlen _fstrlen
1292#  define png_memcmp _fmemcmp      /* SJT: added */
1293#  define png_memcpy _fmemcpy
1294#  define png_memset _fmemset
1295#else /* use the usual functions */
1296#  define CVT_PTR(ptr)         (ptr)
1297#  define CVT_PTR_NOCHECK(ptr) (ptr)
1298#  define png_strcpy strcpy
1299#  define png_strncpy strncpy   /* Added to v 1.2.6 */
1300#  define png_strlen strlen
1301#  define png_memcmp memcmp     /* SJT: added */
1302#  define png_memcpy memcpy
1303#  define png_memset memset
1304#endif
1305/* End of memory model independent support */
1306
1307/* Just a little check that someone hasn't tried to define something
1308 * contradictory.
1309 */
1310#if (PNG_ZBUF_SIZE > 65536) && defined(PNG_MAX_MALLOC_64K)
1311#  undef PNG_ZBUF_SIZE
1312#  define PNG_ZBUF_SIZE 65536
1313#endif
1314
1315#ifdef PNG_READ_SUPPORTED
1316/* Prior to libpng-1.0.9, this block was in pngasmrd.h */
1317#if defined(PNG_INTERNAL)
1318
1319/* These are the default thresholds before the MMX code kicks in; if either
1320 * rowbytes or bitdepth is below the threshold, plain C code is used.  These
1321 * can be overridden at runtime via the png_set_mmx_thresholds() call in
1322 * libpng 1.2.0 and later.  The values below were chosen by Intel.
1323 */
1324
1325#ifndef PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT
1326#  define PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT  128  /*  >=  */
1327#endif
1328#ifndef PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT
1329#  define PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT  9    /*  >=  */   
1330#endif
1331
1332/* Set this in the makefile for VC++ on Pentium, not here. */
1333/* Platform must be Pentium.  Makefile must assemble and load pngvcrd.c .
1334 * MMX will be detected at run time and used if present.
1335 */
1336#ifdef PNG_USE_PNGVCRD
1337#  define PNG_HAVE_ASSEMBLER_COMBINE_ROW
1338#  define PNG_HAVE_ASSEMBLER_READ_INTERLACE
1339#  define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
1340#endif
1341
1342/* Set this in the makefile for gcc/as on Pentium, not here. */
1343/* Platform must be Pentium.  Makefile must assemble and load pnggccrd.c .
1344 * MMX will be detected at run time and used if present.
1345 */
1346#ifdef PNG_USE_PNGGCCRD
1347#  define PNG_HAVE_ASSEMBLER_COMBINE_ROW
1348#  define PNG_HAVE_ASSEMBLER_READ_INTERLACE
1349#  define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
1350#endif
1351/* - see pnggccrd.c for info about what is currently enabled */
1352
1353#endif /* PNG_INTERNAL */
1354#endif /* PNG_READ_SUPPORTED */
1355
1356#endif /* PNGCONF_H */
1357
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