Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
4349 | Serge | 1 | |
2 | * |
||
3 | * For conditions of distribution and use, see copyright notice in png.h |
||
4 | * Copyright (c) 1998-2013 Glenn Randers-Pehrson |
||
5 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
||
6 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
||
7 | * |
||
8 | * Last changed in libpng 1.6.3 [July 18, 2013] |
||
9 | * |
||
10 | * This code is released under the libpng license. |
||
11 | * For conditions of distribution and use, see the disclaimer |
||
12 | * and license in png.h |
||
13 | */ |
||
14 | |||
15 | |||
16 | * as extern) are PRIVATE. They are not part of the libpng public |
||
17 | * interface, and are not recommended for use by regular applications. |
||
18 | * Some of them may become public in the future; others may stay private, |
||
19 | * change in an incompatible way, or even disappear. |
||
20 | * Although the libpng users are not forbidden to include this header, |
||
21 | * they should be well aware of the issues that may arise from doing so. |
||
22 | */ |
||
23 | |||
24 | |||
25 | #define PNGPRIV_H |
||
26 | |||
27 | |||
28 | * implemented libraries reveal the APIs libpng needs to build and hide those |
||
29 | * that are not needed and potentially damaging to the compilation. |
||
30 | * |
||
31 | * Feature Test Macros must be defined before any system header is included (see |
||
32 | * POSIX 1003.1 2.8.2 "POSIX Symbols." |
||
33 | * |
||
34 | * These macros only have an effect if the operating system supports either |
||
35 | * POSIX 1003.1 or C99, or both. On other operating systems (particularly |
||
36 | * Windows/Visual Studio) there is no effect; the OS specific tests below are |
||
37 | * still required (as of 2011-05-02.) |
||
38 | */ |
||
39 | #define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ |
||
40 | |||
41 | |||
42 | /* Standard library headers not required by png.h: */ |
||
43 | # include |
||
44 | # include |
||
45 | #endif |
||
46 | |||
47 | |||
48 | |||
49 | |||
50 | * provide an appropriate "config.h" file on the include path. The header file |
||
51 | * must provide definitions as required below (search for "HAVE_CONFIG_H"); |
||
52 | * see configure.ac for more details of the requirements. The macro |
||
53 | * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on |
||
54 | * 'configure'; define this macro to prevent the configure build including the |
||
55 | * configure generated config.h. Libpng is expected to compile without *any* |
||
56 | * special build system support on a reasonably ANSI-C compliant system. |
||
57 | */ |
||
58 | #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) |
||
59 | # include |
||
60 | |||
61 | |||
62 | # define PNG_RESTRICT restrict |
||
63 | #endif |
||
64 | |||
65 | |||
66 | * whether the fixed point (and maybe other) APIs are exported, because if they |
||
67 | * are not internal definitions may be required. This is handled below just |
||
68 | * before png.h is included, but load the configuration now if it is available. |
||
69 | */ |
||
70 | #ifndef PNGLCONF_H |
||
71 | # include "pnglibconf.h" |
||
72 | #endif |
||
73 | |||
74 | |||
75 | #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H) |
||
76 | # include "pngprefix.h" |
||
77 | #endif |
||
78 | |||
79 | |||
80 | # include "pngusr.h" |
||
81 | /* These should have been defined in pngusr.h */ |
||
82 | # ifndef PNG_USER_PRIVATEBUILD |
||
83 | # define PNG_USER_PRIVATEBUILD "Custom libpng build" |
||
84 | # endif |
||
85 | # ifndef PNG_USER_DLLFNAME_POSTFIX |
||
86 | # define PNG_USER_DLLFNAME_POSTFIX "Cb" |
||
87 | # endif |
||
88 | #endif |
||
89 | |||
90 | |||
91 | * ===================== |
||
92 | * In a multi-arch build the compiler may compile the code several times for the |
||
93 | * same object module, producing different binaries for different architectures. |
||
94 | * When this happens configure-time setting of the target host options cannot be |
||
95 | * done and this interferes with the handling of the ARM NEON optimizations, and |
||
96 | * possibly other similar optimizations. Put additional tests here; in general |
||
97 | * this is needed when the same option can be changed at both compile time and |
||
98 | * run time depending on the target OS (i.e. iOS vs Android.) |
||
99 | * |
||
100 | * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because |
||
101 | * this is not possible with certain compilers (Oracle SUN OS CC), as a result |
||
102 | * it is necessary to ensure that all extern functions that *might* be used |
||
103 | * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__ |
||
104 | * below is one example of this behavior because it is controlled by the |
||
105 | * presence or not of -mfpu=neon on the GCC command line, it is possible to do |
||
106 | * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely |
||
107 | * do this. |
||
108 | */ |
||
109 | #ifndef PNG_ARM_NEON_OPT |
||
110 | /* ARM NEON optimizations are being controlled by the compiler settings, |
||
111 | * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon |
||
112 | * with GCC) then the compiler will define __ARM_NEON__ and we can rely |
||
113 | * unconditionally on NEON instructions not crashing, otherwise we must |
||
114 | * disable use of NEON instructions: |
||
115 | */ |
||
116 | # ifdef __ARM_NEON__ |
||
117 | # define PNG_ARM_NEON_OPT 2 |
||
118 | # else |
||
119 | # define PNG_ARM_NEON_OPT 0 |
||
120 | # endif |
||
121 | #endif |
||
122 | |||
123 | |||
124 | /* NEON optimizations are to be at least considered by libpng, so enable the |
||
125 | * callbacks to do this. |
||
126 | */ |
||
127 | # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon |
||
128 | #endif |
||
129 | |||
130 | |||
131 | * different preprocessor settings to those required for a simple library? If |
||
132 | * so PNG_BUILD_DLL must be set. |
||
133 | * |
||
134 | * If libpng is used inside a DLL but that DLL does not export the libpng APIs |
||
135 | * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a |
||
136 | * static library of libpng then link the DLL against that. |
||
137 | */ |
||
138 | #ifndef PNG_BUILD_DLL |
||
139 | # ifdef DLL_EXPORT |
||
140 | /* This is set by libtool when files are compiled for a DLL; libtool |
||
141 | * always compiles twice, even on systems where it isn't necessary. Set |
||
142 | * PNG_BUILD_DLL in case it is necessary: |
||
143 | */ |
||
144 | # define PNG_BUILD_DLL |
||
145 | # else |
||
146 | # ifdef _WINDLL |
||
147 | /* This is set by the Microsoft Visual Studio IDE in projects that |
||
148 | * build a DLL. It can't easily be removed from those projects (it |
||
149 | * isn't visible in the Visual Studio UI) so it is a fairly reliable |
||
150 | * indication that PNG_IMPEXP needs to be set to the DLL export |
||
151 | * attributes. |
||
152 | */ |
||
153 | # define PNG_BUILD_DLL |
||
154 | # else |
||
155 | # ifdef __DLL__ |
||
156 | /* This is set by the Borland C system when compiling for a DLL |
||
157 | * (as above.) |
||
158 | */ |
||
159 | # define PNG_BUILD_DLL |
||
160 | # else |
||
161 | /* Add additional compiler cases here. */ |
||
162 | # endif |
||
163 | # endif |
||
164 | # endif |
||
165 | #endif /* Setting PNG_BUILD_DLL if required */ |
||
166 | |||
167 | |||
168 | * the command line to the right thing for the specific compilation system or it |
||
169 | * may be automagically set above (at present we know of no system where it does |
||
170 | * need to be set on the command line.) |
||
171 | * |
||
172 | * PNG_IMPEXP must be set here when building the library to prevent pngconf.h |
||
173 | * setting it to the "import" setting for a DLL build. |
||
174 | */ |
||
175 | #ifndef PNG_IMPEXP |
||
176 | # ifdef PNG_BUILD_DLL |
||
177 | # define PNG_IMPEXP PNG_DLL_EXPORT |
||
178 | # else |
||
179 | /* Not building a DLL, or the DLL doesn't require specific export |
||
180 | * definitions. |
||
181 | */ |
||
182 | # define PNG_IMPEXP |
||
183 | # endif |
||
184 | #endif |
||
185 | |||
186 | |||
187 | #ifndef PNG_DEPRECATED |
||
188 | # define PNG_DEPRECATED |
||
189 | #endif |
||
190 | #ifndef PNG_PRIVATE |
||
191 | # define PNG_PRIVATE |
||
192 | #endif |
||
193 | |||
194 | |||
195 | * |
||
196 | * To enable listing global, but internal, symbols the following macros should |
||
197 | * always be used to declare an extern data or function object in this file. |
||
198 | */ |
||
199 | #ifndef PNG_INTERNAL_DATA |
||
200 | # define PNG_INTERNAL_DATA(type, name, array) extern type name array |
||
201 | #endif |
||
202 | |||
203 | |||
204 | # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ |
||
205 | extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) |
||
206 | #endif |
||
207 | |||
208 | |||
209 | * internally. To handle this make sure they are declared as the appropriate |
||
210 | * internal extern function (otherwise the symbol prefixing stuff won't work and |
||
211 | * the functions will be used without definitions.) |
||
212 | * |
||
213 | * NOTE: although all the API functions are declared here they are not all |
||
214 | * actually built! Because the declarations are still made it is necessary to |
||
215 | * fake out types that they depend on. |
||
216 | */ |
||
217 | #ifndef PNG_FP_EXPORT |
||
218 | # ifndef PNG_FLOATING_POINT_SUPPORTED |
||
219 | # define PNG_FP_EXPORT(ordinal, type, name, args)\ |
||
220 | PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); |
||
221 | # ifndef PNG_VERSION_INFO_ONLY |
||
222 | typedef struct png_incomplete png_double; |
||
223 | typedef png_double* png_doublep; |
||
224 | typedef const png_double* png_const_doublep; |
||
225 | typedef png_double** png_doublepp; |
||
226 | # endif |
||
227 | # endif |
||
228 | #endif |
||
229 | #ifndef PNG_FIXED_EXPORT |
||
230 | # ifndef PNG_FIXED_POINT_SUPPORTED |
||
231 | # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ |
||
232 | PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); |
||
233 | # endif |
||
234 | #endif |
||
235 | |||
236 | |||
237 | |||
238 | |||
239 | #ifndef PNG_DLL_EXPORT |
||
240 | # define PNG_DLL_EXPORT |
||
241 | #endif |
||
242 | |||
243 | |||
244 | * |
||
245 | * By default libpng is built without any internal limits on image size, |
||
246 | * individual heap (png_malloc) allocations or the total amount of memory used. |
||
247 | * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used |
||
248 | * (unless individually overridden). These limits are believed to be fairly |
||
249 | * safe, but builders of secure systems should verify the values against the |
||
250 | * real system capabilities. |
||
251 | */ |
||
252 | #ifdef PNG_SAFE_LIMITS_SUPPORTED |
||
253 | /* 'safe' limits */ |
||
254 | # ifndef PNG_USER_WIDTH_MAX |
||
255 | # define PNG_USER_WIDTH_MAX 1000000 |
||
256 | # endif |
||
257 | # ifndef PNG_USER_HEIGHT_MAX |
||
258 | # define PNG_USER_HEIGHT_MAX 1000000 |
||
259 | # endif |
||
260 | # ifndef PNG_USER_CHUNK_CACHE_MAX |
||
261 | # define PNG_USER_CHUNK_CACHE_MAX 128 |
||
262 | # endif |
||
263 | # ifndef PNG_USER_CHUNK_MALLOC_MAX |
||
264 | # define PNG_USER_CHUNK_MALLOC_MAX 8000000 |
||
265 | # endif |
||
266 | #else |
||
267 | /* values for no limits */ |
||
268 | # ifndef PNG_USER_WIDTH_MAX |
||
269 | # define PNG_USER_WIDTH_MAX 0x7fffffff |
||
270 | # endif |
||
271 | # ifndef PNG_USER_HEIGHT_MAX |
||
272 | # define PNG_USER_HEIGHT_MAX 0x7fffffff |
||
273 | # endif |
||
274 | # ifndef PNG_USER_CHUNK_CACHE_MAX |
||
275 | # define PNG_USER_CHUNK_CACHE_MAX 0 |
||
276 | # endif |
||
277 | # ifndef PNG_USER_CHUNK_MALLOC_MAX |
||
278 | # define PNG_USER_CHUNK_MALLOC_MAX 0 |
||
279 | # endif |
||
280 | #endif |
||
281 | |||
282 | |||
283 | /* NOTE: some of these may have been used in external applications as |
||
284 | * these definitions were exposed in pngconf.h prior to 1.5. |
||
285 | */ |
||
286 | |||
287 | |||
288 | * than 64K of memory at once, uncomment this. While libpng will not |
||
289 | * normally need that much memory in a chunk (unless you load up a very |
||
290 | * large file), zlib needs to know how big of a chunk it can use, and |
||
291 | * libpng thus makes sure to check any memory allocation to verify it |
||
292 | * will fit into memory. |
||
293 | * |
||
294 | * zlib provides 'MAXSEG_64K' which, if defined, indicates the |
||
295 | * same limit and pngconf.h (already included) sets the limit |
||
296 | * if certain operating systems are detected. |
||
297 | */ |
||
298 | #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) |
||
299 | # define PNG_MAX_MALLOC_64K |
||
300 | #endif |
||
301 | |||
302 | |||
303 | /* Unused formal parameter warnings are silenced using the following macro |
||
304 | * which is expected to have no bad effects on performance (optimizing |
||
305 | * compilers will probably remove it entirely). Note that if you replace |
||
306 | * it with something other than whitespace, you must include the terminating |
||
307 | * semicolon. |
||
308 | */ |
||
309 | # define PNG_UNUSED(param) (void)param; |
||
310 | #endif |
||
311 | |||
312 | |||
313 | * contradictory. |
||
314 | */ |
||
315 | #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) |
||
316 | # undef PNG_ZBUF_SIZE |
||
317 | # define PNG_ZBUF_SIZE 65536L |
||
318 | #endif |
||
319 | |||
320 | |||
321 | * From 1.5.4 functions have been added to allow very limited formatting of |
||
322 | * error and warning messages - this code will also be disabled here. |
||
323 | */ |
||
324 | #ifdef PNG_WARNINGS_SUPPORTED |
||
325 | # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; |
||
326 | #else |
||
327 | # define png_warning(s1,s2) ((void)(s1)) |
||
328 | # define png_chunk_warning(s1,s2) ((void)(s1)) |
||
329 | # define png_warning_parameter(p,number,string) ((void)0) |
||
330 | # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) |
||
331 | # define png_warning_parameter_signed(p,number,format,value) ((void)0) |
||
332 | # define png_formatted_warning(pp,p,message) ((void)(pp)) |
||
333 | # define PNG_WARNING_PARAMETERS(p) |
||
334 | #endif |
||
335 | #ifndef PNG_ERROR_TEXT_SUPPORTED |
||
336 | # define png_error(s1,s2) png_err(s1) |
||
337 | # define png_chunk_error(s1,s2) png_err(s1) |
||
338 | # define png_fixed_error(s1,s2) png_err(s1) |
||
339 | #endif |
||
340 | |||
341 | |||
342 | * pointer to a const object. C++ regards this as a type error and requires an |
||
343 | * explicit, static, cast and provides the static_cast<> rune to ensure that |
||
344 | * const is not cast away. |
||
345 | */ |
||
346 | #ifdef __cplusplus |
||
347 | # define png_voidcast(type, value) static_cast |
||
348 | # define png_constcast(type, value) const_cast |
||
349 | # define png_aligncast(type, value) \ |
||
350 | static_cast |
||
351 | # define png_aligncastconst(type, value) \ |
||
352 | static_cast |
||
353 | #else |
||
354 | # define png_voidcast(type, value) (value) |
||
355 | # define png_constcast(type, value) ((type)(value)) |
||
356 | # define png_aligncast(type, value) ((void*)(value)) |
||
357 | # define png_aligncastconst(type, value) ((const void*)(value)) |
||
358 | #endif /* __cplusplus */ |
||
359 | |||
360 | |||
361 | * they get used by the corresponding floating point APIs. This magic |
||
362 | * deals with this: |
||
363 | */ |
||
364 | #ifdef PNG_FIXED_POINT_SUPPORTED |
||
365 | # define PNGFAPI PNGAPI |
||
366 | #else |
||
367 | # define PNGFAPI /* PRIVATE */ |
||
368 | #endif |
||
369 | |||
370 | |||
371 | /* Other defines specific to compilers can go here. Try to keep |
||
372 | * them inside an appropriate ifdef/endif pair for portability. |
||
373 | */ |
||
374 | #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ |
||
375 | defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) |
||
376 | /* png.c requires the following ANSI-C constants if the conversion of |
||
377 | * floating point to ASCII is implemented therein: |
||
378 | * |
||
379 | * DBL_DIG Maximum number of decimal digits (can be set to any constant) |
||
380 | * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) |
||
381 | * DBL_MAX Maximum floating point number (can be set to an arbitrary value) |
||
382 | */ |
||
383 | # include |
||
384 | |||
385 | |||
386 | defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) |
||
387 | /* We need to check that |
||
388 | * as it seems it doesn't agree with |
||
389 | * |
||
390 | */ |
||
391 | # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) |
||
392 | # include |
||
393 | # endif |
||
394 | # else |
||
395 | # include |
||
396 | # endif |
||
397 | # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) |
||
398 | /* Amiga SAS/C: We must include builtin FPU functions when compiling using |
||
399 | * MATH=68881 |
||
400 | */ |
||
401 | # include |
||
402 | # endif |
||
403 | #endif |
||
404 | |||
405 | |||
406 | #if defined(__TURBOC__) && defined(__MSDOS__) |
||
407 | # include |
||
408 | # include |
||
409 | #endif |
||
410 | |||
411 | |||
412 | defined(_WIN32) || defined(__WIN32__) |
||
413 | # include |
||
414 | #endif |
||
415 | #endif /* PNG_VERSION_INFO_ONLY */ |
||
416 | |||
417 | |||
418 | /* Users may want to use these so they are not private. Any library |
||
419 | * functions that are passed far data must be model-independent. |
||
420 | */ |
||
421 | |||
422 | |||
423 | #ifndef PNG_ABORT |
||
424 | # ifdef _WINDOWS_ |
||
425 | # define PNG_ABORT() ExitProcess(0) |
||
426 | # else |
||
427 | # define PNG_ABORT() abort() |
||
428 | # endif |
||
429 | #endif |
||
430 | |||
431 | |||
432 | #define PNG_ALIGN_NONE 0 /* do not use data alignment */ |
||
433 | #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ |
||
434 | #ifdef offsetof |
||
435 | # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ |
||
436 | #else |
||
437 | # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ |
||
438 | #endif |
||
439 | #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ |
||
440 | |||
441 | |||
442 | /* Default to using aligned access optimizations and requiring alignment to a |
||
443 | * multiple of the data type size. Override in a compiler specific fashion |
||
444 | * if necessary by inserting tests here: |
||
445 | */ |
||
446 | # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE |
||
447 | #endif |
||
448 | |||
449 | |||
450 | /* This is used because in some compiler implementations non-aligned |
||
451 | * structure members are supported, so the offsetof approach below fails. |
||
452 | * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access |
||
453 | * is good for performance. Do not do this unless you have tested the result |
||
454 | * and understand it. |
||
455 | */ |
||
456 | # define png_alignof(type) (sizeof (type)) |
||
457 | #else |
||
458 | # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET |
||
459 | # define png_alignof(type) offsetof(struct{char c; type t;}, t) |
||
460 | # else |
||
461 | # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS |
||
462 | # define png_alignof(type) (1) |
||
463 | # endif |
||
464 | /* Else leave png_alignof undefined to prevent use thereof */ |
||
465 | # endif |
||
466 | #endif |
||
467 | |||
468 | |||
469 | #ifdef png_alignof |
||
470 | # define png_isaligned(ptr, type)\ |
||
471 | ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) |
||
472 | #else |
||
473 | # define png_isaligned(ptr, type) 0 |
||
474 | #endif |
||
475 | |||
476 | |||
477 | /* End of 1.5.0beta36 move from pngconf.h */ |
||
478 | |||
479 | |||
480 | * These are used internally by libpng and not exposed in the API |
||
481 | */ |
||
482 | |||
483 | |||
484 | * zero automatically when the structure is created. Three of these |
||
485 | * are defined in png.h because they need to be visible to applications |
||
486 | * that call png_set_unknown_chunk(). |
||
487 | */ |
||
488 | /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ |
||
489 | /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ |
||
490 | #define PNG_HAVE_IDAT 0x04 |
||
491 | /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ |
||
492 | #define PNG_HAVE_IEND 0x10 |
||
493 | /* 0x20 (unused) */ |
||
494 | /* 0x40 (unused) */ |
||
495 | /* 0x80 (unused) */ |
||
496 | #define PNG_HAVE_CHUNK_HEADER 0x100 |
||
497 | #define PNG_WROTE_tIME 0x200 |
||
498 | #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 |
||
499 | #define PNG_BACKGROUND_IS_GRAY 0x800 |
||
500 | #define PNG_HAVE_PNG_SIGNATURE 0x1000 |
||
501 | #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ |
||
502 | /* 0x4000 (unused) */ |
||
503 | #define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */ |
||
504 | |||
505 | |||
506 | #define PNG_BGR 0x0001 |
||
507 | #define PNG_INTERLACE 0x0002 |
||
508 | #define PNG_PACK 0x0004 |
||
509 | #define PNG_SHIFT 0x0008 |
||
510 | #define PNG_SWAP_BYTES 0x0010 |
||
511 | #define PNG_INVERT_MONO 0x0020 |
||
512 | #define PNG_QUANTIZE 0x0040 |
||
513 | #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ |
||
514 | #define PNG_BACKGROUND_EXPAND 0x0100 |
||
515 | #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ |
||
516 | #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ |
||
517 | #define PNG_RGBA 0x0800 |
||
518 | #define PNG_EXPAND 0x1000 |
||
519 | #define PNG_GAMMA 0x2000 |
||
520 | #define PNG_GRAY_TO_RGB 0x4000 |
||
521 | #define PNG_FILLER 0x8000 |
||
522 | #define PNG_PACKSWAP 0x10000 |
||
523 | #define PNG_SWAP_ALPHA 0x20000 |
||
524 | #define PNG_STRIP_ALPHA 0x40000 |
||
525 | #define PNG_INVERT_ALPHA 0x80000 |
||
526 | #define PNG_USER_TRANSFORM 0x100000 |
||
527 | #define PNG_RGB_TO_GRAY_ERR 0x200000 |
||
528 | #define PNG_RGB_TO_GRAY_WARN 0x400000 |
||
529 | #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ |
||
530 | #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ |
||
531 | #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ |
||
532 | #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ |
||
533 | #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ |
||
534 | /* 0x8000000 unused */ |
||
535 | /* 0x10000000 unused */ |
||
536 | /* 0x20000000 unused */ |
||
537 | /* 0x40000000 unused */ |
||
538 | /* Flags for png_create_struct */ |
||
539 | #define PNG_STRUCT_PNG 0x0001 |
||
540 | #define PNG_STRUCT_INFO 0x0002 |
||
541 | |||
542 | |||
543 | #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) |
||
544 | #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) |
||
545 | |||
546 | |||
547 | #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 |
||
548 | #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */ |
||
549 | /* 0x0004 unused */ |
||
550 | #define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */ |
||
551 | /* 0x0010 unused */ |
||
552 | /* 0x0020 unused */ |
||
553 | #define PNG_FLAG_ROW_INIT 0x0040 |
||
554 | #define PNG_FLAG_FILLER_AFTER 0x0080 |
||
555 | #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 |
||
556 | #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 |
||
557 | #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 |
||
558 | #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 |
||
559 | #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ |
||
560 | #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ |
||
561 | #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ |
||
562 | /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */ |
||
563 | /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */ |
||
564 | #define PNG_FLAG_LIBRARY_MISMATCH 0x20000 |
||
565 | #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 |
||
566 | #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 |
||
567 | #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */ |
||
568 | #define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */ |
||
569 | #define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */ |
||
570 | /* 0x800000 unused */ |
||
571 | /* 0x1000000 unused */ |
||
572 | /* 0x2000000 unused */ |
||
573 | /* 0x4000000 unused */ |
||
574 | /* 0x8000000 unused */ |
||
575 | /* 0x10000000 unused */ |
||
576 | /* 0x20000000 unused */ |
||
577 | /* 0x40000000 unused */ |
||
578 | |||
579 | |||
580 | PNG_FLAG_CRC_ANCILLARY_NOWARN) |
||
581 | |||
582 | |||
583 | PNG_FLAG_CRC_CRITICAL_IGNORE) |
||
584 | |||
585 | |||
586 | PNG_FLAG_CRC_CRITICAL_MASK) |
||
587 | |||
588 | |||
589 | |||
590 | |||
591 | abs((int)((c1).green) - (int)((c2).green)) + \ |
||
592 | abs((int)((c1).blue) - (int)((c2).blue))) |
||
593 | |||
594 | |||
595 | * by dividing by 257 *with rounding*. This macro is exact for the given range. |
||
596 | * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the |
||
597 | * macro were established by experiment (modifying the added value). The macro |
||
598 | * has a second variant that takes a value already scaled by 255 and divides by |
||
599 | * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it |
||
600 | * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. |
||
601 | */ |
||
602 | #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) |
||
603 | #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) |
||
604 | |||
605 | |||
606 | #define PNG_ROWBYTES(pixel_bits, width) \ |
||
607 | ((pixel_bits) >= 8 ? \ |
||
608 | ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ |
||
609 | (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) |
||
610 | |||
611 | |||
612 | * ideal-delta..ideal+delta. Each argument is evaluated twice. |
||
613 | * "ideal" and "delta" should be constants, normally simple |
||
614 | * integers, "value" a variable. Added to libpng-1.2.6 JB |
||
615 | */ |
||
616 | #define PNG_OUT_OF_RANGE(value, ideal, delta) \ |
||
617 | ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) |
||
618 | |||
619 | |||
620 | * required (to make sure the code doesn't accidentally use float |
||
621 | * when it is supposedly disabled.) |
||
622 | */ |
||
623 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
||
624 | /* The floating point conversion can't overflow, though it can and |
||
625 | * does lose accuracy relative to the original fixed point value. |
||
626 | * In practice this doesn't matter because png_fixed_point only |
||
627 | * stores numbers with very low precision. The png_ptr and s |
||
628 | * arguments are unused by default but are there in case error |
||
629 | * checking becomes a requirement. |
||
630 | */ |
||
631 | #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) |
||
632 | |||
633 | |||
634 | * its argument multiple times, so must be used with care. The |
||
635 | * range checking uses the PNG specification values for a signed |
||
636 | * 32 bit fixed point value except that the values are deliberately |
||
637 | * rounded-to-zero to an integral value - 21474 (21474.83 is roughly |
||
638 | * (2^31-1) * 100000). 's' is a string that describes the value being |
||
639 | * converted. |
||
640 | * |
||
641 | * NOTE: this macro will raise a png_error if the range check fails, |
||
642 | * therefore it is normally only appropriate to use this on values |
||
643 | * that come from API calls or other sources where an out of range |
||
644 | * error indicates a programming error, not a data error! |
||
645 | * |
||
646 | * NOTE: by default this is off - the macro is not used - because the |
||
647 | * function call saves a lot of code. |
||
648 | */ |
||
649 | #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED |
||
650 | #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ |
||
651 | ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) |
||
652 | #endif |
||
653 | /* else the corresponding function is defined below, inside the scope of the |
||
654 | * cplusplus test. |
||
655 | */ |
||
656 | #endif |
||
657 | |||
658 | |||
659 | * here. For historical reasons these constants have the form png_ |
||
660 | * the prefix is lower case. Please use decimal values as the parameters to |
||
661 | * match the ISO PNG specification and to avoid relying on the C locale |
||
662 | * interpretation of character values. |
||
663 | * |
||
664 | * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values |
||
665 | * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string |
||
666 | * to be generated if required. |
||
667 | * |
||
668 | * PNG_32b correctly produces a value shifted by up to 24 bits, even on |
||
669 | * architectures where (int) is only 16 bits. |
||
670 | */ |
||
671 | #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) |
||
672 | #define PNG_U32(b1,b2,b3,b4) \ |
||
673 | (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) |
||
674 | |||
675 | |||
676 | * |
||
677 | * MAINTAINERS: If you need to add a chunk, define the name here. |
||
678 | * For historical reasons these constants have the form png_ |
||
679 | * the prefix is lower case. Please use decimal values as the parameters to |
||
680 | * match the ISO PNG specification and to avoid relying on the C locale |
||
681 | * interpretation of character values. Please keep the list sorted. |
||
682 | * |
||
683 | * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk |
||
684 | * type. In fact the specification does not express chunk types this way, |
||
685 | * however using a 32-bit value means that the chunk type can be read from the |
||
686 | * stream using exactly the same code as used for a 32-bit unsigned value and |
||
687 | * can be examined far more efficiently (using one arithmetic compare). |
||
688 | * |
||
689 | * Prior to 1.5.6 the chunk type constants were expressed as C strings. The |
||
690 | * libpng API still uses strings for 'unknown' chunks and a macro, |
||
691 | * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice |
||
692 | * that for portable code numeric values must still be used; the string "IHDR" |
||
693 | * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). |
||
694 | * |
||
695 | * In 1.7.0 the definitions will be made public in png.h to avoid having to |
||
696 | * duplicate the same definitions in application code. |
||
697 | */ |
||
698 | #define png_IDAT PNG_U32( 73, 68, 65, 84) |
||
699 | #define png_IEND PNG_U32( 73, 69, 78, 68) |
||
700 | #define png_IHDR PNG_U32( 73, 72, 68, 82) |
||
701 | #define png_PLTE PNG_U32( 80, 76, 84, 69) |
||
702 | #define png_bKGD PNG_U32( 98, 75, 71, 68) |
||
703 | #define png_cHRM PNG_U32( 99, 72, 82, 77) |
||
704 | #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ |
||
705 | #define png_gAMA PNG_U32(103, 65, 77, 65) |
||
706 | #define png_gIFg PNG_U32(103, 73, 70, 103) |
||
707 | #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ |
||
708 | #define png_gIFx PNG_U32(103, 73, 70, 120) |
||
709 | #define png_hIST PNG_U32(104, 73, 83, 84) |
||
710 | #define png_iCCP PNG_U32(105, 67, 67, 80) |
||
711 | #define png_iTXt PNG_U32(105, 84, 88, 116) |
||
712 | #define png_oFFs PNG_U32(111, 70, 70, 115) |
||
713 | #define png_pCAL PNG_U32(112, 67, 65, 76) |
||
714 | #define png_pHYs PNG_U32(112, 72, 89, 115) |
||
715 | #define png_sBIT PNG_U32(115, 66, 73, 84) |
||
716 | #define png_sCAL PNG_U32(115, 67, 65, 76) |
||
717 | #define png_sPLT PNG_U32(115, 80, 76, 84) |
||
718 | #define png_sRGB PNG_U32(115, 82, 71, 66) |
||
719 | #define png_sTER PNG_U32(115, 84, 69, 82) |
||
720 | #define png_tEXt PNG_U32(116, 69, 88, 116) |
||
721 | #define png_tIME PNG_U32(116, 73, 77, 69) |
||
722 | #define png_tRNS PNG_U32(116, 82, 78, 83) |
||
723 | #define png_zTXt PNG_U32(122, 84, 88, 116) |
||
724 | |||
725 | |||
726 | * macro will fail on top-bit-set values because of the sign extension. |
||
727 | */ |
||
728 | #define PNG_CHUNK_FROM_STRING(s)\ |
||
729 | PNG_U32(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3]) |
||
730 | |||
731 | |||
732 | * signed and the argument is a (char[]) This macro will fail miserably on |
||
733 | * systems where (char) is more than 8 bits. |
||
734 | */ |
||
735 | #define PNG_STRING_FROM_CHUNK(s,c)\ |
||
736 | (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\ |
||
737 | ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c))) |
||
738 | |||
739 | |||
740 | #define PNG_CSTRING_FROM_CHUNK(s,c)\ |
||
741 | (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) |
||
742 | |||
743 | |||
744 | #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) |
||
745 | #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) |
||
746 | #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) |
||
747 | #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) |
||
748 | #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) |
||
749 | |||
750 | |||
751 | #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ |
||
752 | #define PNG_GAMMA_MAC_INVERSE 65909 |
||
753 | #define PNG_GAMMA_sRGB_INVERSE 45455 |
||
754 | |||
755 | |||
756 | * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. |
||
757 | */ |
||
758 | #ifndef PNG_VERSION_INFO_ONLY |
||
759 | |||
760 | |||
761 | #include "pnginfo.h" |
||
762 | |||
763 | |||
764 | * must match that used in the build, or we must be using pnglibconf.h.prebuilt: |
||
765 | */ |
||
766 | #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM |
||
767 | # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ |
||
768 | "-I (include path) error: see the notes in pngpriv.h" |
||
769 | /* This means that when pnglibconf.h was built the copy of zlib.h that it |
||
770 | * used is not the same as the one being used here. Because the build of |
||
771 | * libpng makes decisions to use inflateInit2 and inflateReset2 based on the |
||
772 | * zlib version number and because this affects handling of certain broken |
||
773 | * PNG files the -I directives must match. |
||
774 | * |
||
775 | * The most likely explanation is that you passed a -I in CFLAGS, this will |
||
776 | * not work; all the preprocessor directories and in particular all the -I |
||
777 | * directives must be in CPPFLAGS. |
||
778 | */ |
||
779 | #endif |
||
780 | |||
781 | |||
782 | * const; this could be changed: |
||
783 | */ |
||
784 | typedef const png_uint_16p * png_const_uint_16pp; |
||
785 | |||
786 | |||
787 | #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ |
||
788 | defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) |
||
789 | #ifdef PNG_SIMPLIFIED_READ_SUPPORTED |
||
790 | PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); |
||
791 | /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, |
||
792 | * 0..65535. This table gives the closest 16-bit answers (no errors). |
||
793 | */ |
||
794 | #endif |
||
795 | |||
796 | |||
797 | PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); |
||
798 | |||
799 | |||
800 | ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)) |
||
801 | /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB |
||
802 | * encoded value with maximum error 0.646365. Note that the input is not a |
||
803 | * 16-bit value; it has been multiplied by 255! */ |
||
804 | #endif /* PNG_SIMPLIFIED_READ/WRITE */ |
||
805 | |||
806 | |||
807 | |||
808 | #ifdef __cplusplus |
||
809 | extern "C" { |
||
810 | #endif /* __cplusplus */ |
||
811 | |||
812 | |||
813 | * are used within several of the C source files they have to be C extern. |
||
814 | * |
||
815 | * All of these functions must be declared with PNG_INTERNAL_FUNCTION. |
||
816 | */ |
||
817 | |||
818 | |||
819 | #define PNG_UNEXPECTED_ZLIB_RETURN (-7) |
||
820 | PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), |
||
821 | PNG_EMPTY); |
||
822 | /* Used by the zlib handling functions to ensure that z_stream::msg is always |
||
823 | * set before they return. |
||
824 | */ |
||
825 | |||
826 | |||
827 | PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, |
||
828 | png_compression_bufferp *list),PNG_EMPTY); |
||
829 | /* Free the buffer list used by the compressed write code. */ |
||
830 | #endif |
||
831 | |||
832 | |||
833 | !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ |
||
834 | (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ |
||
835 | defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ |
||
836 | defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ |
||
837 | (defined(PNG_sCAL_SUPPORTED) && \ |
||
838 | defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) |
||
839 | PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, |
||
840 | double fp, png_const_charp text),PNG_EMPTY); |
||
841 | #endif |
||
842 | |||
843 | |||
844 | * numbers aren't compatible. |
||
845 | */ |
||
846 | PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, |
||
847 | png_const_charp user_png_ver),PNG_EMPTY); |
||
848 | |||
849 | |||
850 | * does, however, call the application provided allocator and that could call |
||
851 | * png_error (although that would be a bug in the application implementation.) |
||
852 | */ |
||
853 | PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, |
||
854 | png_alloc_size_t size),PNG_ALLOCATED); |
||
855 | |||
856 | |||
857 | defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) |
||
858 | /* Internal array allocator, outputs no error or warning messages on failure, |
||
859 | * just returns NULL. |
||
860 | */ |
||
861 | PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, |
||
862 | int nelements, size_t element_size),PNG_ALLOCATED); |
||
863 | |||
864 | |||
865 | * also memsets the new elements to 0 and copies the old elements. The old |
||
866 | * array is not freed or altered. |
||
867 | */ |
||
868 | PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, |
||
869 | png_const_voidp array, int old_elements, int add_elements, |
||
870 | size_t element_size),PNG_ALLOCATED); |
||
871 | #endif /* text, sPLT or unknown chunks */ |
||
872 | |||
873 | |||
874 | * memory allocators. Because error handling has not been set up the memory |
||
875 | * handlers can't safely call png_error, but this is an obscure and undocumented |
||
876 | * restriction so libpng has to assume that the 'free' handler, at least, might |
||
877 | * call png_error. |
||
878 | */ |
||
879 | PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, |
||
880 | (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, |
||
881 | png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, |
||
882 | png_free_ptr free_fn),PNG_ALLOCATED); |
||
883 | |||
884 | |||
885 | PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), |
||
886 | PNG_EMPTY); |
||
887 | |||
888 | |||
889 | PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); |
||
890 | |||
891 | |||
892 | PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), |
||
893 | PNG_ALLOCATED); |
||
894 | |||
895 | |||
896 | PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); |
||
897 | |||
898 | |||
899 | * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to |
||
900 | * PNGCBAPI at 1.5.0 |
||
901 | */ |
||
902 | |||
903 | |||
904 | png_bytep data, png_size_t length),PNG_EMPTY); |
||
905 | |||
906 | |||
907 | PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, |
||
908 | png_bytep buffer, png_size_t length),PNG_EMPTY); |
||
909 | #endif |
||
910 | |||
911 | |||
912 | png_bytep data, png_size_t length),PNG_EMPTY); |
||
913 | |||
914 | |||
915 | # ifdef PNG_STDIO_SUPPORTED |
||
916 | PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), |
||
917 | PNG_EMPTY); |
||
918 | # endif |
||
919 | #endif |
||
920 | |||
921 | |||
922 | PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); |
||
923 | |||
924 | |||
925 | PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, |
||
926 | png_const_bytep data, png_size_t length),PNG_EMPTY); |
||
927 | |||
928 | |||
929 | PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, |
||
930 | png_inforp info_ptr),PNG_EMPTY); |
||
931 | |||
932 | |||
933 | PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), |
||
934 | PNG_EMPTY); |
||
935 | |||
936 | |||
937 | PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, |
||
938 | png_size_t length),PNG_EMPTY); |
||
939 | |||
940 | |||
941 | PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, |
||
942 | png_uint_32 length),PNG_EMPTY); |
||
943 | |||
944 | |||
945 | PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, |
||
946 | png_uint_32 skip),PNG_EMPTY); |
||
947 | |||
948 | |||
949 | PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); |
||
950 | |||
951 | |||
952 | * passing a maximum of 64K on systems that have this as a memory limit, |
||
953 | * since this is the maximum buffer size we can specify. |
||
954 | */ |
||
955 | PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, |
||
956 | png_const_bytep ptr, png_size_t length),PNG_EMPTY); |
||
957 | |||
958 | |||
959 | PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); |
||
960 | #endif |
||
961 | |||
962 | |||
963 | |||
964 | |||
965 | * information. |
||
966 | */ |
||
967 | PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, |
||
968 | png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, |
||
969 | int compression_method, int filter_method, int interlace_method),PNG_EMPTY); |
||
970 | |||
971 | |||
972 | png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); |
||
973 | |||
974 | |||
975 | png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), |
||
976 | PNG_EMPTY); |
||
977 | |||
978 | |||
979 | |||
980 | |||
981 | PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, |
||
982 | png_fixed_point file_gamma),PNG_EMPTY); |
||
983 | #endif |
||
984 | |||
985 | |||
986 | PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, |
||
987 | png_const_color_8p sbit, int color_type),PNG_EMPTY); |
||
988 | #endif |
||
989 | |||
990 | |||
991 | PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, |
||
992 | const png_xy *xy), PNG_EMPTY); |
||
993 | /* The xy value must have been previously validated */ |
||
994 | #endif |
||
995 | |||
996 | |||
997 | PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, |
||
998 | int intent),PNG_EMPTY); |
||
999 | #endif |
||
1000 | |||
1001 | |||
1002 | PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, |
||
1003 | png_const_charp name, png_const_bytep profile), PNG_EMPTY); |
||
1004 | /* The profile must have been previously validated for correctness, the |
||
1005 | * length comes from the first four bytes. Only the base, deflate, |
||
1006 | * compression is supported. |
||
1007 | */ |
||
1008 | #endif |
||
1009 | |||
1010 | |||
1011 | PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, |
||
1012 | png_const_sPLT_tp palette),PNG_EMPTY); |
||
1013 | #endif |
||
1014 | |||
1015 | |||
1016 | PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, |
||
1017 | png_const_bytep trans, png_const_color_16p values, int number, |
||
1018 | int color_type),PNG_EMPTY); |
||
1019 | #endif |
||
1020 | |||
1021 | |||
1022 | PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, |
||
1023 | png_const_color_16p values, int color_type),PNG_EMPTY); |
||
1024 | #endif |
||
1025 | |||
1026 | |||
1027 | PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, |
||
1028 | png_const_uint_16p hist, int num_hist),PNG_EMPTY); |
||
1029 | #endif |
||
1030 | |||
1031 | |||
1032 | #ifdef PNG_WRITE_tEXt_SUPPORTED |
||
1033 | PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, |
||
1034 | png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); |
||
1035 | #endif |
||
1036 | |||
1037 | |||
1038 | PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp |
||
1039 | key, png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY); |
||
1040 | #endif |
||
1041 | |||
1042 | |||
1043 | PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, |
||
1044 | int compression, png_const_charp key, png_const_charp lang, |
||
1045 | png_const_charp lang_key, png_const_charp text),PNG_EMPTY); |
||
1046 | #endif |
||
1047 | |||
1048 | |||
1049 | PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, |
||
1050 | png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); |
||
1051 | #endif |
||
1052 | |||
1053 | |||
1054 | PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, |
||
1055 | png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); |
||
1056 | #endif |
||
1057 | |||
1058 | |||
1059 | PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, |
||
1060 | png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, |
||
1061 | png_const_charp units, png_charpp params),PNG_EMPTY); |
||
1062 | #endif |
||
1063 | |||
1064 | |||
1065 | PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, |
||
1066 | png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, |
||
1067 | int unit_type),PNG_EMPTY); |
||
1068 | #endif |
||
1069 | |||
1070 | |||
1071 | PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, |
||
1072 | png_const_timep mod_time),PNG_EMPTY); |
||
1073 | #endif |
||
1074 | |||
1075 | |||
1076 | PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, |
||
1077 | int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); |
||
1078 | #endif |
||
1079 | |||
1080 | |||
1081 | PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), |
||
1082 | PNG_EMPTY); |
||
1083 | |||
1084 | |||
1085 | PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), |
||
1086 | PNG_EMPTY); |
||
1087 | |||
1088 | |||
1089 | * array of png_ptr->width pixels. If the image is not interlaced or this |
||
1090 | * is the final pass this just does a memcpy, otherwise the "display" flag |
||
1091 | * is used to determine whether to copy pixels that are not in the current pass. |
||
1092 | * |
||
1093 | * Because 'png_do_read_interlace' (below) replicates pixels this allows this |
||
1094 | * function to achieve the documented 'blocky' appearance during interlaced read |
||
1095 | * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' |
||
1096 | * are not changed if they are not in the current pass, when display is 0. |
||
1097 | * |
||
1098 | * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. |
||
1099 | * |
||
1100 | * The API always reads from the png_struct row buffer and always assumes that |
||
1101 | * it is full width (png_do_read_interlace has already been called.) |
||
1102 | * |
||
1103 | * This function is only ever used to write to row buffers provided by the |
||
1104 | * caller of the relevant libpng API and the row must have already been |
||
1105 | * transformed by the read transformations. |
||
1106 | * |
||
1107 | * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed |
||
1108 | * bitmasks for use within the code, otherwise runtime generated masks are used. |
||
1109 | * The default is compile time masks. |
||
1110 | */ |
||
1111 | #ifndef PNG_USE_COMPILE_TIME_MASKS |
||
1112 | # define PNG_USE_COMPILE_TIME_MASKS 1 |
||
1113 | #endif |
||
1114 | PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, |
||
1115 | png_bytep row, int display),PNG_EMPTY); |
||
1116 | |||
1117 | |||
1118 | /* Expand an interlaced row: the 'row_info' describes the pass data that has |
||
1119 | * been read in and must correspond to the pixels in 'row', the pixels are |
||
1120 | * expanded (moved apart) in 'row' to match the final layout, when doing this |
||
1121 | * the pixels are *replicated* to the intervening space. This is essential for |
||
1122 | * the correct operation of png_combine_row, above. |
||
1123 | */ |
||
1124 | PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, |
||
1125 | png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); |
||
1126 | #endif |
||
1127 | |||
1128 | |||
1129 | |||
1130 | |||
1131 | /* Grab pixels out of a row for an interlaced pass */ |
||
1132 | PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, |
||
1133 | png_bytep row, int pass),PNG_EMPTY); |
||
1134 | #endif |
||
1135 | |||
1136 | |||
1137 | * calling it for PNG_FILTER_VALUE_NONE. |
||
1138 | */ |
||
1139 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop |
||
1140 | row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); |
||
1141 | |||
1142 | |||
1143 | png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
||
1144 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop |
||
1145 | row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
||
1146 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop |
||
1147 | row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
||
1148 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop |
||
1149 | row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
||
1150 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop |
||
1151 | row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
||
1152 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop |
||
1153 | row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
||
1154 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop |
||
1155 | row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
||
1156 | |||
1157 | |||
1158 | PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, |
||
1159 | png_row_infop row_info),PNG_EMPTY); |
||
1160 | |||
1161 | |||
1162 | PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, |
||
1163 | png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); |
||
1164 | /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer |
||
1165 | * is NULL the function checks, instead, for the end of the stream. In this |
||
1166 | * case a benign error will be issued if the stream end is not found or if |
||
1167 | * extra data has to be consumed. |
||
1168 | */ |
||
1169 | PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), |
||
1170 | PNG_EMPTY); |
||
1171 | /* This cleans up when the IDAT LZ stream does not end when the last image |
||
1172 | * byte is read; there is still some pending input. |
||
1173 | */ |
||
1174 | |||
1175 | |||
1176 | PNG_EMPTY); |
||
1177 | /* Finish a row while reading, dealing with interlacing passes, etc. */ |
||
1178 | #endif |
||
1179 | |||
1180 | |||
1181 | PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); |
||
1182 | |||
1183 | |||
1184 | /* Optional call to update the users info structure */ |
||
1185 | PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, |
||
1186 | png_inforp info_ptr),PNG_EMPTY); |
||
1187 | #endif |
||
1188 | |||
1189 | |||
1190 | #ifdef PNG_READ_FILLER_SUPPORTED |
||
1191 | PNG_INTERNAL_FUNCTION(void,png_do_read_filler,(png_row_infop row_info, |
||
1192 | png_bytep row, png_uint_32 filler, png_uint_32 flags),PNG_EMPTY); |
||
1193 | #endif |
||
1194 | |||
1195 | |||
1196 | PNG_INTERNAL_FUNCTION(void,png_do_read_swap_alpha,(png_row_infop row_info, |
||
1197 | png_bytep row),PNG_EMPTY); |
||
1198 | #endif |
||
1199 | |||
1200 | |||
1201 | PNG_INTERNAL_FUNCTION(void,png_do_write_swap_alpha,(png_row_infop row_info, |
||
1202 | png_bytep row),PNG_EMPTY); |
||
1203 | #endif |
||
1204 | |||
1205 | |||
1206 | PNG_INTERNAL_FUNCTION(void,png_do_read_invert_alpha,(png_row_infop row_info, |
||
1207 | png_bytep row),PNG_EMPTY); |
||
1208 | #endif |
||
1209 | |||
1210 | |||
1211 | PNG_INTERNAL_FUNCTION(void,png_do_write_invert_alpha,(png_row_infop row_info, |
||
1212 | png_bytep row),PNG_EMPTY); |
||
1213 | #endif |
||
1214 | |||
1215 | |||
1216 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
||
1217 | PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, |
||
1218 | png_bytep row, int at_start),PNG_EMPTY); |
||
1219 | #endif |
||
1220 | |||
1221 | |||
1222 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
||
1223 | PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, |
||
1224 | png_bytep row),PNG_EMPTY); |
||
1225 | #endif |
||
1226 | #endif |
||
1227 | |||
1228 | |||
1229 | defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
||
1230 | PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, |
||
1231 | png_bytep row),PNG_EMPTY); |
||
1232 | #endif |
||
1233 | |||
1234 | |||
1235 | PNG_INTERNAL_FUNCTION(int,png_do_rgb_to_gray,(png_structrp png_ptr, |
||
1236 | png_row_infop row_info, png_bytep row),PNG_EMPTY); |
||
1237 | #endif |
||
1238 | |||
1239 | |||
1240 | PNG_INTERNAL_FUNCTION(void,png_do_gray_to_rgb,(png_row_infop row_info, |
||
1241 | png_bytep row),PNG_EMPTY); |
||
1242 | #endif |
||
1243 | |||
1244 | |||
1245 | PNG_INTERNAL_FUNCTION(void,png_do_unpack,(png_row_infop row_info, |
||
1246 | png_bytep row),PNG_EMPTY); |
||
1247 | #endif |
||
1248 | |||
1249 | |||
1250 | PNG_INTERNAL_FUNCTION(void,png_do_unshift,(png_row_infop row_info, |
||
1251 | png_bytep row, png_const_color_8p sig_bits),PNG_EMPTY); |
||
1252 | #endif |
||
1253 | |||
1254 | |||
1255 | PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, |
||
1256 | png_bytep row),PNG_EMPTY); |
||
1257 | #endif |
||
1258 | |||
1259 | |||
1260 | PNG_INTERNAL_FUNCTION(void,png_do_scale_16_to_8,(png_row_infop row_info, |
||
1261 | png_bytep row),PNG_EMPTY); |
||
1262 | #endif |
||
1263 | |||
1264 | |||
1265 | PNG_INTERNAL_FUNCTION(void,png_do_chop,(png_row_infop row_info, |
||
1266 | png_bytep row),PNG_EMPTY); |
||
1267 | #endif |
||
1268 | |||
1269 | |||
1270 | PNG_INTERNAL_FUNCTION(void,png_do_quantize,(png_row_infop row_info, |
||
1271 | png_bytep row, png_const_bytep palette_lookup, |
||
1272 | png_const_bytep quantize_lookup),PNG_EMPTY); |
||
1273 | |||
1274 | |||
1275 | PNG_INTERNAL_FUNCTION(void,png_correct_palette,(png_structrp png_ptr, |
||
1276 | png_colorp palette, int num_palette),PNG_EMPTY); |
||
1277 | # endif |
||
1278 | #endif |
||
1279 | |||
1280 | |||
1281 | PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, |
||
1282 | png_bytep row),PNG_EMPTY); |
||
1283 | #endif |
||
1284 | |||
1285 | |||
1286 | PNG_INTERNAL_FUNCTION(void,png_do_pack,(png_row_infop row_info, |
||
1287 | png_bytep row, png_uint_32 bit_depth),PNG_EMPTY); |
||
1288 | #endif |
||
1289 | |||
1290 | |||
1291 | PNG_INTERNAL_FUNCTION(void,png_do_shift,(png_row_infop row_info, |
||
1292 | png_bytep row, png_const_color_8p bit_depth),PNG_EMPTY); |
||
1293 | #endif |
||
1294 | |||
1295 | |||
1296 | defined(PNG_READ_ALPHA_MODE_SUPPORTED) |
||
1297 | PNG_INTERNAL_FUNCTION(void,png_do_compose,(png_row_infop row_info, |
||
1298 | png_bytep row, png_structrp png_ptr),PNG_EMPTY); |
||
1299 | #endif |
||
1300 | |||
1301 | |||
1302 | PNG_INTERNAL_FUNCTION(void,png_do_gamma,(png_row_infop row_info, |
||
1303 | png_bytep row, png_structrp png_ptr),PNG_EMPTY); |
||
1304 | #endif |
||
1305 | |||
1306 | |||
1307 | PNG_INTERNAL_FUNCTION(void,png_do_encode_alpha,(png_row_infop row_info, |
||
1308 | png_bytep row, png_structrp png_ptr),PNG_EMPTY); |
||
1309 | #endif |
||
1310 | |||
1311 | |||
1312 | PNG_INTERNAL_FUNCTION(void,png_do_expand_palette,(png_row_infop row_info, |
||
1313 | png_bytep row, png_const_colorp palette, png_const_bytep trans, |
||
1314 | int num_trans),PNG_EMPTY); |
||
1315 | PNG_INTERNAL_FUNCTION(void,png_do_expand,(png_row_infop row_info, |
||
1316 | png_bytep row, png_const_color_16p trans_color),PNG_EMPTY); |
||
1317 | #endif |
||
1318 | |||
1319 | |||
1320 | PNG_INTERNAL_FUNCTION(void,png_do_expand_16,(png_row_infop row_info, |
||
1321 | png_bytep row),PNG_EMPTY); |
||
1322 | #endif |
||
1323 | |||
1324 | |||
1325 | * then calls the appropriate callback for the chunk if it is valid. |
||
1326 | */ |
||
1327 | |||
1328 | |||
1329 | PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, |
||
1330 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1331 | PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, |
||
1332 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1333 | PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, |
||
1334 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1335 | |||
1336 | |||
1337 | PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, |
||
1338 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1339 | #endif |
||
1340 | |||
1341 | |||
1342 | PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, |
||
1343 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1344 | #endif |
||
1345 | |||
1346 | |||
1347 | PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, |
||
1348 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1349 | #endif |
||
1350 | |||
1351 | |||
1352 | PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, |
||
1353 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1354 | #endif |
||
1355 | |||
1356 | |||
1357 | PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, |
||
1358 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1359 | #endif /* PNG_READ_iCCP_SUPPORTED */ |
||
1360 | |||
1361 | |||
1362 | PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, |
||
1363 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1364 | #endif |
||
1365 | |||
1366 | |||
1367 | PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, |
||
1368 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1369 | #endif |
||
1370 | |||
1371 | |||
1372 | PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, |
||
1373 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1374 | #endif |
||
1375 | |||
1376 | |||
1377 | PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, |
||
1378 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1379 | #endif |
||
1380 | |||
1381 | |||
1382 | PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, |
||
1383 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1384 | #endif |
||
1385 | |||
1386 | |||
1387 | PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, |
||
1388 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1389 | #endif |
||
1390 | |||
1391 | |||
1392 | PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, |
||
1393 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1394 | #endif /* PNG_READ_sPLT_SUPPORTED */ |
||
1395 | |||
1396 | |||
1397 | PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, |
||
1398 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1399 | #endif |
||
1400 | |||
1401 | |||
1402 | PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, |
||
1403 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1404 | #endif |
||
1405 | |||
1406 | |||
1407 | PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, |
||
1408 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1409 | #endif |
||
1410 | |||
1411 | |||
1412 | PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, |
||
1413 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1414 | #endif |
||
1415 | |||
1416 | |||
1417 | PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, |
||
1418 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1419 | #endif |
||
1420 | |||
1421 | |||
1422 | png_uint_32 chunk_name),PNG_EMPTY); |
||
1423 | |||
1424 | |||
1425 | PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, |
||
1426 | png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); |
||
1427 | /* This is the function that gets called for unknown chunks. The 'keep' |
||
1428 | * argument is either non-zero for a known chunk that has been set to be |
||
1429 | * handled as unknown or zero for an unknown chunk. By default the function |
||
1430 | * just skips the chunk or errors out if it is critical. |
||
1431 | */ |
||
1432 | |||
1433 | |||
1434 | PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, |
||
1435 | (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); |
||
1436 | /* Exactly as the API png_handle_as_unknown() except that the argument is a |
||
1437 | * 32-bit chunk name, not a string. |
||
1438 | */ |
||
1439 | #endif /* PNG_HANDLE_AS_UNKNOWN_SUPPORTED */ |
||
1440 | #endif /* PNG_READ_SUPPORTED */ |
||
1441 | |||
1442 | |||
1443 | #ifdef PNG_READ_TRANSFORMS_SUPPORTED |
||
1444 | PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, |
||
1445 | png_row_infop row_info),PNG_EMPTY); |
||
1446 | #endif |
||
1447 | #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED |
||
1448 | PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, |
||
1449 | png_row_infop row_info),PNG_EMPTY); |
||
1450 | #endif |
||
1451 | |||
1452 | |||
1453 | PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), |
||
1454 | PNG_EMPTY); |
||
1455 | #endif |
||
1456 | |||
1457 | |||
1458 | PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, |
||
1459 | png_inforp info_ptr),PNG_EMPTY); |
||
1460 | PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, |
||
1461 | png_inforp info_ptr),PNG_EMPTY); |
||
1462 | PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); |
||
1463 | PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr, |
||
1464 | png_uint_32 length),PNG_EMPTY); |
||
1465 | PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr), |
||
1466 | PNG_EMPTY); |
||
1467 | PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), |
||
1468 | PNG_EMPTY); |
||
1469 | PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, |
||
1470 | png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); |
||
1471 | PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); |
||
1472 | PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, |
||
1473 | png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); |
||
1474 | PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), |
||
1475 | PNG_EMPTY); |
||
1476 | PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, |
||
1477 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1478 | PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, |
||
1479 | png_inforp info_ptr),PNG_EMPTY); |
||
1480 | PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, |
||
1481 | png_inforp info_ptr),PNG_EMPTY); |
||
1482 | PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, |
||
1483 | png_bytep row),PNG_EMPTY); |
||
1484 | PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, |
||
1485 | png_inforp info_ptr),PNG_EMPTY); |
||
1486 | PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, |
||
1487 | png_inforp info_ptr),PNG_EMPTY); |
||
1488 | PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), |
||
1489 | PNG_EMPTY); |
||
1490 | # ifdef PNG_READ_tEXt_SUPPORTED |
||
1491 | PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, |
||
1492 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1493 | PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, |
||
1494 | png_inforp info_ptr),PNG_EMPTY); |
||
1495 | # endif |
||
1496 | # ifdef PNG_READ_zTXt_SUPPORTED |
||
1497 | PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, |
||
1498 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1499 | PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, |
||
1500 | png_inforp info_ptr),PNG_EMPTY); |
||
1501 | # endif |
||
1502 | # ifdef PNG_READ_iTXt_SUPPORTED |
||
1503 | PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, |
||
1504 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
||
1505 | PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, |
||
1506 | png_inforp info_ptr),PNG_EMPTY); |
||
1507 | # endif |
||
1508 | |||
1509 | |||
1510 | |||
1511 | |||
1512 | PNG_INTERNAL_FUNCTION(void,png_do_read_intrapixel,(png_row_infop row_info, |
||
1513 | png_bytep row),PNG_EMPTY); |
||
1514 | PNG_INTERNAL_FUNCTION(void,png_do_write_intrapixel,(png_row_infop row_info, |
||
1515 | png_bytep row),PNG_EMPTY); |
||
1516 | #endif |
||
1517 | |||
1518 | |||
1519 | #ifdef PNG_GAMMA_SUPPORTED |
||
1520 | PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, |
||
1521 | png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); |
||
1522 | /* Set the colorspace gamma with a value provided by the application or by |
||
1523 | * the gAMA chunk on read. The value will override anything set by an ICC |
||
1524 | * profile. |
||
1525 | */ |
||
1526 | |||
1527 | |||
1528 | png_inforp info_ptr), PNG_EMPTY); |
||
1529 | /* Synchronize the info 'valid' flags with the colorspace */ |
||
1530 | |||
1531 | |||
1532 | png_inforp info_ptr), PNG_EMPTY); |
||
1533 | /* Copy the png_struct colorspace to the info_struct and call the above to |
||
1534 | * synchronize the flags. Checks for NULL info_ptr and does nothing. |
||
1535 | */ |
||
1536 | #endif |
||
1537 | |||
1538 | |||
1539 | #ifdef PNG_COLORSPACE_SUPPORTED |
||
1540 | /* These internal functions are for maintaining the colorspace structure within |
||
1541 | * a png_info or png_struct (or, indeed, both). |
||
1542 | */ |
||
1543 | PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, |
||
1544 | (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, |
||
1545 | int preferred), PNG_EMPTY); |
||
1546 | |||
1547 | |||
1548 | (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, |
||
1549 | int preferred), PNG_EMPTY); |
||
1550 | |||
1551 | |||
1552 | PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, |
||
1553 | png_colorspacerp colorspace, int intent), PNG_EMPTY); |
||
1554 | /* This does set the colorspace gAMA and cHRM values too, but doesn't set the |
||
1555 | * flags to write them, if it returns false there was a problem and an error |
||
1556 | * message has already been output (but the colorspace may still need to be |
||
1557 | * synced to record the invalid flag). |
||
1558 | */ |
||
1559 | #endif /* sRGB */ |
||
1560 | |||
1561 | |||
1562 | PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, |
||
1563 | png_colorspacerp colorspace, png_const_charp name, |
||
1564 | png_uint_32 profile_length, png_const_bytep profile, int color_type), |
||
1565 | PNG_EMPTY); |
||
1566 | /* The 'name' is used for information only */ |
||
1567 | |||
1568 | |||
1569 | PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, |
||
1570 | png_colorspacerp colorspace, png_const_charp name, |
||
1571 | png_uint_32 profile_length), PNG_EMPTY); |
||
1572 | PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, |
||
1573 | png_colorspacerp colorspace, png_const_charp name, |
||
1574 | png_uint_32 profile_length, |
||
1575 | png_const_bytep profile /* first 132 bytes only */, int color_type), |
||
1576 | PNG_EMPTY); |
||
1577 | PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, |
||
1578 | png_colorspacerp colorspace, png_const_charp name, |
||
1579 | png_uint_32 profile_length, |
||
1580 | png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); |
||
1581 | #ifdef PNG_sRGB_SUPPORTED |
||
1582 | PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( |
||
1583 | png_const_structrp png_ptr, png_colorspacerp colorspace, |
||
1584 | png_const_bytep profile, uLong adler), PNG_EMPTY); |
||
1585 | /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may |
||
1586 | * be zero to indicate that it is not available. It is used, if provided, |
||
1587 | * as a fast check on the profile when checking to see if it is sRGB. |
||
1588 | */ |
||
1589 | #endif |
||
1590 | #endif /* iCCP */ |
||
1591 | |||
1592 | |||
1593 | PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, |
||
1594 | (png_structrp png_ptr), PNG_EMPTY); |
||
1595 | /* Set the rgb_to_gray coefficients from the colorspace Y values */ |
||
1596 | #endif /* READ_RGB_TO_GRAY */ |
||
1597 | #endif /* COLORSPACE */ |
||
1598 | |||
1599 | |||
1600 | PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, |
||
1601 | png_uint_32 width, png_uint_32 height, int bit_depth, |
||
1602 | int color_type, int interlace_type, int compression_type, |
||
1603 | int filter_type),PNG_EMPTY); |
||
1604 | |||
1605 | |||
1606 | #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ |
||
1607 | defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) |
||
1608 | PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, |
||
1609 | (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); |
||
1610 | #endif |
||
1611 | |||
1612 | |||
1613 | PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, |
||
1614 | png_const_charp name),PNG_NORETURN); |
||
1615 | #endif |
||
1616 | |||
1617 | |||
1618 | * the end. Always leaves the buffer nul terminated. Never errors out (and |
||
1619 | * there is no error code.) |
||
1620 | */ |
||
1621 | PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, |
||
1622 | size_t pos, png_const_charp string),PNG_EMPTY); |
||
1623 | |||
1624 | |||
1625 | * only implemented for warnings. |
||
1626 | */ |
||
1627 | #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) |
||
1628 | /* Utility to dump an unsigned value into a buffer, given a start pointer and |
||
1629 | * and end pointer (which should point just *beyond* the end of the buffer!) |
||
1630 | * Returns the pointer to the start of the formatted string. This utility only |
||
1631 | * does unsigned values. |
||
1632 | */ |
||
1633 | PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, |
||
1634 | png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); |
||
1635 | |||
1636 | |||
1637 | #define PNG_FORMAT_NUMBER(buffer,format,number) \ |
||
1638 | png_format_number(buffer, buffer + (sizeof buffer), format, number) |
||
1639 | |||
1640 | |||
1641 | #define PNG_NUMBER_BUFFER_SIZE 24 |
||
1642 | |||
1643 | |||
1644 | * the standard printf(3) format string. |
||
1645 | */ |
||
1646 | #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ |
||
1647 | #define PNG_NUMBER_FORMAT_02u 2 |
||
1648 | #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ |
||
1649 | #define PNG_NUMBER_FORMAT_02d 2 |
||
1650 | #define PNG_NUMBER_FORMAT_x 3 |
||
1651 | #define PNG_NUMBER_FORMAT_02x 4 |
||
1652 | #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ |
||
1653 | #endif |
||
1654 | |||
1655 | |||
1656 | /* New defines and members adding in libpng-1.5.4 */ |
||
1657 | # define PNG_WARNING_PARAMETER_SIZE 32 |
||
1658 | # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ |
||
1659 | |||
1660 | |||
1661 | * values of the parameters to a formatted warning message. |
||
1662 | */ |
||
1663 | typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ |
||
1664 | PNG_WARNING_PARAMETER_SIZE]; |
||
1665 | |||
1666 | |||
1667 | int number, png_const_charp string),PNG_EMPTY); |
||
1668 | /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, |
||
1669 | * including the trailing '\0'. |
||
1670 | */ |
||
1671 | PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, |
||
1672 | (png_warning_parameters p, int number, int format, png_alloc_size_t value), |
||
1673 | PNG_EMPTY); |
||
1674 | /* Use png_alloc_size_t because it is an unsigned type as big as any we |
||
1675 | * need to output. Use the following for a signed value. |
||
1676 | */ |
||
1677 | PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, |
||
1678 | (png_warning_parameters p, int number, int format, png_int_32 value), |
||
1679 | PNG_EMPTY); |
||
1680 | |||
1681 | |||
1682 | png_warning_parameters p, png_const_charp message),PNG_EMPTY); |
||
1683 | /* 'message' follows the X/Open approach of using @1, @2 to insert |
||
1684 | * parameters previously supplied using the above functions. Errors in |
||
1685 | * specifying the parameters will simply result in garbage substitutions. |
||
1686 | */ |
||
1687 | #endif |
||
1688 | |||
1689 | |||
1690 | /* Application errors (new in 1.6); use these functions (declared below) for |
||
1691 | * errors in the parameters or order of API function calls on read. The |
||
1692 | * 'warning' should be used for an error that can be handled completely; the |
||
1693 | * 'error' for one which can be handled safely but which may lose application |
||
1694 | * information or settings. |
||
1695 | * |
||
1696 | * By default these both result in a png_error call prior to release, while in a |
||
1697 | * released version the 'warning' is just a warning. However if the application |
||
1698 | * explicitly disables benign errors (explicitly permitting the code to lose |
||
1699 | * information) they both turn into warnings. |
||
1700 | * |
||
1701 | * If benign errors aren't supported they end up as the corresponding base call |
||
1702 | * (png_warning or png_error.) |
||
1703 | */ |
||
1704 | PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, |
||
1705 | png_const_charp message),PNG_EMPTY); |
||
1706 | /* The application provided invalid parameters to an API function or called |
||
1707 | * an API function at the wrong time, libpng can completely recover. |
||
1708 | */ |
||
1709 | |||
1710 | |||
1711 | png_const_charp message),PNG_EMPTY); |
||
1712 | /* As above but libpng will ignore the call, or attempt some other partial |
||
1713 | * recovery from the error. |
||
1714 | */ |
||
1715 | #else |
||
1716 | # define png_app_warning(pp,s) png_warning(pp,s) |
||
1717 | # define png_app_error(pp,s) png_error(pp,s) |
||
1718 | #endif |
||
1719 | |||
1720 | |||
1721 | png_const_charp message, int error),PNG_EMPTY); |
||
1722 | /* Report a recoverable issue in chunk data. On read this is used to report |
||
1723 | * a problem found while reading a particular chunk and the |
||
1724 | * png_chunk_benign_error or png_chunk_warning function is used as |
||
1725 | * appropriate. On write this is used to report an error that comes from |
||
1726 | * data set via an application call to a png_set_ API and png_app_error or |
||
1727 | * png_app_warning is used as appropriate. |
||
1728 | * |
||
1729 | * The 'error' parameter must have one of the following values: |
||
1730 | */ |
||
1731 | #define PNG_CHUNK_WARNING 0 /* never an error */ |
||
1732 | #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ |
||
1733 | #define PNG_CHUNK_ERROR 2 /* always an error */ |
||
1734 | |||
1735 | |||
1736 | * support is required. |
||
1737 | */ |
||
1738 | #if defined(PNG_sCAL_SUPPORTED) |
||
1739 | /* MAX_DIGITS is actually the maximum number of characters in an sCAL |
||
1740 | * width or height, derived from the precision (number of significant |
||
1741 | * digits - a build time settable option) and assumptions about the |
||
1742 | * maximum ridiculous exponent. |
||
1743 | */ |
||
1744 | #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) |
||
1745 | |||
1746 | |||
1747 | PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, |
||
1748 | png_charp ascii, png_size_t size, double fp, unsigned int precision), |
||
1749 | PNG_EMPTY); |
||
1750 | #endif /* FLOATING_POINT */ |
||
1751 | |||
1752 | |||
1753 | PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, |
||
1754 | png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); |
||
1755 | #endif /* FIXED_POINT */ |
||
1756 | #endif /* sCAL */ |
||
1757 | |||
1758 | |||
1759 | /* An internal API to validate the format of a floating point number. |
||
1760 | * The result is the index of the next character. If the number is |
||
1761 | * not valid it will be the index of a character in the supposed number. |
||
1762 | * |
||
1763 | * The format of a number is defined in the PNG extensions specification |
||
1764 | * and this API is strictly conformant to that spec, not anyone elses! |
||
1765 | * |
||
1766 | * The format as a regular expression is: |
||
1767 | * |
||
1768 | * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? |
||
1769 | * |
||
1770 | * or: |
||
1771 | * |
||
1772 | * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? |
||
1773 | * |
||
1774 | * The complexity is that either integer or fraction must be present and the |
||
1775 | * fraction is permitted to have no digits only if the integer is present. |
||
1776 | * |
||
1777 | * NOTE: The dangling E problem. |
||
1778 | * There is a PNG valid floating point number in the following: |
||
1779 | * |
||
1780 | * PNG floating point numbers are not greedy. |
||
1781 | * |
||
1782 | * Working this out requires *TWO* character lookahead (because of the |
||
1783 | * sign), the parser does not do this - it will fail at the 'r' - this |
||
1784 | * doesn't matter for PNG sCAL chunk values, but it requires more care |
||
1785 | * if the value were ever to be embedded in something more complex. Use |
||
1786 | * ANSI-C strtod if you need the lookahead. |
||
1787 | */ |
||
1788 | /* State table for the parser. */ |
||
1789 | #define PNG_FP_INTEGER 0 /* before or in integer */ |
||
1790 | #define PNG_FP_FRACTION 1 /* before or in fraction */ |
||
1791 | #define PNG_FP_EXPONENT 2 /* before or in exponent */ |
||
1792 | #define PNG_FP_STATE 3 /* mask for the above */ |
||
1793 | #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ |
||
1794 | #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ |
||
1795 | #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ |
||
1796 | #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ |
||
1797 | #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ |
||
1798 | |||
1799 | |||
1800 | */ |
||
1801 | #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ |
||
1802 | #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ |
||
1803 | #define PNG_FP_NONZERO 256 /* A non-zero value */ |
||
1804 | #define PNG_FP_STICKY 448 /* The above three flags */ |
||
1805 | |||
1806 | |||
1807 | * call the parser after setting it (the parser sometimes clears it.) |
||
1808 | */ |
||
1809 | #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ |
||
1810 | |||
1811 | |||
1812 | * not ok yet.) |
||
1813 | */ |
||
1814 | #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ |
||
1815 | #define PNG_FP_OK 1 /* The number is valid */ |
||
1816 | |||
1817 | |||
1818 | * the state must also indicate that the whole number is valid - this is |
||
1819 | * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this |
||
1820 | * is equivalent to PNG_FP_OK above.) |
||
1821 | */ |
||
1822 | #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) |
||
1823 | /* NZ_MASK: the string is valid and a non-zero negative value */ |
||
1824 | #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) |
||
1825 | /* Z MASK: the string is valid and a non-zero value. */ |
||
1826 | /* PNG_FP_SAW_DIGIT: the string is valid. */ |
||
1827 | #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) |
||
1828 | #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) |
||
1829 | #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) |
||
1830 | |||
1831 | |||
1832 | * the index into the string and the state variable (which must |
||
1833 | * be initialized to 0). It returns a result code, as above. There |
||
1834 | * is no point calling the parser any more if it fails to advance to |
||
1835 | * the end of the string - it is stuck on an invalid character (or |
||
1836 | * terminated by '\0'). |
||
1837 | * |
||
1838 | * Note that the pointer will consume an E or even an E+ and then leave |
||
1839 | * a 'maybe' state even though a preceding integer.fraction is valid. |
||
1840 | * The PNG_FP_WAS_VALID flag indicates that a preceding substring was |
||
1841 | * a valid number. It's possible to recover from this by calling |
||
1842 | * the parser again (from the start, with state 0) but with a string |
||
1843 | * that omits the last character (i.e. set the size to the index of |
||
1844 | * the problem character.) This has not been tested within libpng. |
||
1845 | */ |
||
1846 | PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, |
||
1847 | png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); |
||
1848 | |||
1849 | |||
1850 | * only if it just contains a floating point number. As of 1.5.4 this |
||
1851 | * function also returns the state at the end of parsing the number if |
||
1852 | * it was valid (otherwise it returns 0.) This can be used for testing |
||
1853 | * for negative or zero values using the sticky flag. |
||
1854 | */ |
||
1855 | PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, |
||
1856 | png_size_t size),PNG_EMPTY); |
||
1857 | #endif /* pCAL || sCAL */ |
||
1858 | |||
1859 | |||
1860 | defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) |
||
1861 | /* Added at libpng version 1.5.0 */ |
||
1862 | /* This is a utility to provide a*times/div (rounded) and indicate |
||
1863 | * if there is an overflow. The result is a boolean - false (0) |
||
1864 | * for overflow, true (1) if no overflow, in which case *res |
||
1865 | * holds the result. |
||
1866 | */ |
||
1867 | PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, |
||
1868 | png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); |
||
1869 | #endif |
||
1870 | |||
1871 | |||
1872 | /* Same deal, but issue a warning on overflow and return 0. */ |
||
1873 | PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, |
||
1874 | (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, |
||
1875 | png_int_32 divided_by),PNG_EMPTY); |
||
1876 | #endif |
||
1877 | |||
1878 | |||
1879 | /* Calculate a reciprocal - used for gamma values. This returns |
||
1880 | * 0 if the argument is 0 in order to maintain an undefined value; |
||
1881 | * there are no warnings. |
||
1882 | */ |
||
1883 | PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), |
||
1884 | PNG_EMPTY); |
||
1885 | |||
1886 | |||
1887 | /* The same but gives a reciprocal of the product of two fixed point |
||
1888 | * values. Accuracy is suitable for gamma calculations but this is |
||
1889 | * not exact - use png_muldiv for that. Only required at present on read. |
||
1890 | */ |
||
1891 | PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, |
||
1892 | png_fixed_point b),PNG_EMPTY); |
||
1893 | #endif |
||
1894 | |||
1895 | |||
1896 | PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), |
||
1897 | PNG_EMPTY); |
||
1898 | #endif |
||
1899 | |||
1900 | |||
1901 | /* Internal fixed point gamma correction. These APIs are called as |
||
1902 | * required to convert single values - they don't need to be fast, |
||
1903 | * they are not used when processing image pixel values. |
||
1904 | * |
||
1905 | * While the input is an 'unsigned' value it must actually be the |
||
1906 | * correct bit value - 0..255 or 0..65535 as required. |
||
1907 | */ |
||
1908 | PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, |
||
1909 | unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); |
||
1910 | PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, |
||
1911 | png_fixed_point gamma_value),PNG_EMPTY); |
||
1912 | PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, |
||
1913 | png_fixed_point gamma_value),PNG_EMPTY); |
||
1914 | PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), |
||
1915 | PNG_EMPTY); |
||
1916 | PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, |
||
1917 | int bit_depth),PNG_EMPTY); |
||
1918 | #endif |
||
1919 | |||
1920 | |||
1921 | #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ |
||
1922 | defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) |
||
1923 | /* The internal structure that png_image::opaque points to. */ |
||
1924 | typedef struct png_control |
||
1925 | { |
||
1926 | png_structp png_ptr; |
||
1927 | png_infop info_ptr; |
||
1928 | png_voidp error_buf; /* Always a jmp_buf at present. */ |
||
1929 | |||
1930 | |||
1931 | png_size_t size; /* Size of the memory buffer. */ |
||
1932 | |||
1933 | |||
1934 | unsigned int owned_file :1; /* We own the file in io_ptr */ |
||
1935 | } png_control; |
||
1936 | |||
1937 | |||
1938 | * does not reveal the type of the elements of jmp_buf. |
||
1939 | */ |
||
1940 | #ifdef __cplusplus |
||
1941 | # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) |
||
1942 | #else |
||
1943 | # define png_control_jmp_buf(pc) ((pc)->error_buf) |
||
1944 | #endif |
||
1945 | |||
1946 | |||
1947 | * errors that might occur. Returns true on success, false on failure (either |
||
1948 | * of the function or as a result of a png_error.) |
||
1949 | */ |
||
1950 | PNG_INTERNAL_FUNCTION(void,png_safe_error,(png_structp png_ptr, |
||
1951 | png_const_charp error_message),PNG_NORETURN); |
||
1952 | |||
1953 | |||
1954 | PNG_INTERNAL_FUNCTION(void,png_safe_warning,(png_structp png_ptr, |
||
1955 | png_const_charp warning_message),PNG_EMPTY); |
||
1956 | #else |
||
1957 | # define png_safe_warning 0/*dummy argument*/ |
||
1958 | #endif |
||
1959 | |||
1960 | |||
1961 | int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); |
||
1962 | |||
1963 | |||
1964 | * always returns 0 (false). |
||
1965 | */ |
||
1966 | PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, |
||
1967 | png_const_charp error_message),PNG_EMPTY); |
||
1968 | |||
1969 | |||
1970 | /* png_image_free is used by the write code but not exported */ |
||
1971 | PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); |
||
1972 | #endif /* !SIMPLIFIED_READ */ |
||
1973 | |||
1974 | |||
1975 | |||
1976 | |||
1977 | * optimizations; list these here then select the appropriate one at compile |
||
1978 | * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined |
||
1979 | * the generic code is used. |
||
1980 | */ |
||
1981 | #ifdef PNG_FILTER_OPTIMIZATIONS |
||
1982 | PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, |
||
1983 | unsigned int bpp), PNG_EMPTY); |
||
1984 | /* Just declare the optimization that will be used */ |
||
1985 | #else |
||
1986 | /* List *all* the possible optimizations here - this branch is required if |
||
1987 | * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in |
||
1988 | * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. |
||
1989 | */ |
||
1990 | PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, |
||
1991 | (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); |
||
1992 | #endif |
||
1993 | |||
1994 | |||
1995 | |||
1996 | |||
1997 | |||
1998 | |||
1999 | } |
||
2000 | #endif |
||
2001 | |||
2002 | |||
2003 | #endif /* PNGPRIV_H */><>=>>(PNG_COST_SHIFT)) |
||
2004 |