source: trunk/src/3rdparty/libpng/pngpriv.h@ 1163

Last change on this file since 1163 was 846, checked in by Dmitry A. Kuminov, 15 years ago

trunk: Merged in qt 4.7.2 sources from branches/vendor/nokia/qt.
File size: 34.4 KB
Line 
1
2/* pngpriv.h - private declarations for use inside libpng
3 *
4 * libpng version 1.4.0 - January 3, 2010
5 * For conditions of distribution and use, see copyright notice in png.h
6 * Copyright (c) 1998-2010 Glenn Randers-Pehrson
7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
9 *
10 * This code is released under the libpng license.
11 * For conditions of distribution and use, see the disclaimer
12 * and license in png.h
13 */
14
15/* The symbols declared in this file (including the functions declared
16 * as PNG_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#ifndef PNGPRIV_H
25#define PNGPRIV_H
26
27#ifndef PNG_VERSION_INFO_ONLY
28
29#include <stdlib.h>
30
31/* The functions exported by PNG_EXTERN are internal functions, which
32 * aren't usually used outside the library (as far as I know), so it is
33 * debatable if they should be exported at all. In the future, when it
34 * is possible to have run-time registry of chunk-handling functions,
35 * some of these will be made available again.
36#define PNG_EXTERN extern
37 */
38#define PNG_EXTERN
39
40/* Other defines specific to compilers can go here. Try to keep
41 * them inside an appropriate ifdef/endif pair for portability.
42 */
43
44#ifdef PNG_FLOATING_POINT_SUPPORTED
45# ifdef MACOS
46 /* We need to check that <math.h> hasn't already been included earlier
47 * as it seems it doesn't agree with <fp.h>, yet we should really use
48 * <fp.h> if possible.
49 */
50# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
51# include <fp.h>
52# endif
53# else
54# include <math.h>
55# endif
56# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
57 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
58 * MATH=68881
59 */
60# include <m68881.h>
61# endif
62#endif
63
64/* Codewarrior on NT has linking problems without this. */
65#if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__)
66# define PNG_ALWAYS_EXTERN
67#endif
68
69/* This provides the non-ANSI (far) memory allocation routines. */
70#if defined(__TURBOC__) && defined(__MSDOS__)
71# include <mem.h>
72# include <alloc.h>
73#endif
74
75#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
76 defined(_WIN32) || defined(__WIN32__)
77# if !defined(__SYMBIAN32__)
78# include <windows.h> /* defines _WINDOWS_ macro */
79# endif
80/* I have no idea why is this necessary... */
81# ifdef _MSC_VER
82# include <malloc.h>
83# endif
84#endif
85
86/* Various modes of operation. Note that after an init, mode is set to
87 * zero automatically when the structure is created.
88 */
89#define PNG_HAVE_IHDR 0x01
90#define PNG_HAVE_PLTE 0x02
91#define PNG_HAVE_IDAT 0x04
92#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
93#define PNG_HAVE_IEND 0x10
94#define PNG_HAVE_gAMA 0x20
95#define PNG_HAVE_cHRM 0x40
96#define PNG_HAVE_sRGB 0x80
97#define PNG_HAVE_CHUNK_HEADER 0x100
98#define PNG_WROTE_tIME 0x200
99#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
100#define PNG_BACKGROUND_IS_GRAY 0x800
101#define PNG_HAVE_PNG_SIGNATURE 0x1000
102#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
103
104/* Flags for the transformations the PNG library does on the image data */
105#define PNG_BGR 0x0001
106#define PNG_INTERLACE 0x0002
107#define PNG_PACK 0x0004
108#define PNG_SHIFT 0x0008
109#define PNG_SWAP_BYTES 0x0010
110#define PNG_INVERT_MONO 0x0020
111#define PNG_DITHER 0x0040
112#define PNG_BACKGROUND 0x0080
113#define PNG_BACKGROUND_EXPAND 0x0100
114 /* 0x0200 unused */
115#define PNG_16_TO_8 0x0400
116#define PNG_RGBA 0x0800
117#define PNG_EXPAND 0x1000
118#define PNG_GAMMA 0x2000
119#define PNG_GRAY_TO_RGB 0x4000
120#define PNG_FILLER 0x8000L
121#define PNG_PACKSWAP 0x10000L
122#define PNG_SWAP_ALPHA 0x20000L
123#define PNG_STRIP_ALPHA 0x40000L
124#define PNG_INVERT_ALPHA 0x80000L
125#define PNG_USER_TRANSFORM 0x100000L
126#define PNG_RGB_TO_GRAY_ERR 0x200000L
127#define PNG_RGB_TO_GRAY_WARN 0x400000L
128#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
129 /* 0x800000L Unused */
130#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
131#define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
132 /* 0x4000000L unused */
133 /* 0x8000000L unused */
134 /* 0x10000000L unused */
135 /* 0x20000000L unused */
136 /* 0x40000000L unused */
137
138/* Flags for png_create_struct */
139#define PNG_STRUCT_PNG 0x0001
140#define PNG_STRUCT_INFO 0x0002
141
142/* Scaling factor for filter heuristic weighting calculations */
143#define PNG_WEIGHT_SHIFT 8
144#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
145#define PNG_COST_SHIFT 3
146#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
147
148/* Flags for the png_ptr->flags rather than declaring a byte for each one */
149#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
150#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
151#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
152#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
153#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
154#define PNG_FLAG_ZLIB_FINISHED 0x0020
155#define PNG_FLAG_ROW_INIT 0x0040
156#define PNG_FLAG_FILLER_AFTER 0x0080
157#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
158#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
159#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
160#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
161 /* 0x1000 unused */
162 /* 0x2000 unused */
163 /* 0x4000 unused */
164#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
165#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
166#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
167#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
168#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
169#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
170#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
171#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
172#define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000L /* Added to libpng-1.4.0 */
173 /* 0x1000000L unused */
174 /* 0x2000000L unused */
175 /* 0x4000000L unused */
176 /* 0x8000000L unused */
177 /* 0x10000000L unused */
178 /* 0x20000000L unused */
179 /* 0x40000000L unused */
180
181#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
182 PNG_FLAG_CRC_ANCILLARY_NOWARN)
183
184#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
185 PNG_FLAG_CRC_CRITICAL_IGNORE)
186
187#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
188 PNG_FLAG_CRC_CRITICAL_MASK)
189
190/* Save typing and make code easier to understand */
191
192#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
193 abs((int)((c1).green) - (int)((c2).green)) + \
194 abs((int)((c1).blue) - (int)((c2).blue)))
195
196/* Added to libpng-1.2.6 JB */
197#define PNG_ROWBYTES(pixel_bits, width) \
198 ((pixel_bits) >= 8 ? \
199 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
200 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
201
202/* PNG_OUT_OF_RANGE returns true if value is outside the range
203 * ideal-delta..ideal+delta. Each argument is evaluated twice.
204 * "ideal" and "delta" should be constants, normally simple
205 * integers, "value" a variable. Added to libpng-1.2.6 JB
206 */
207#define PNG_OUT_OF_RANGE(value, ideal, delta) \
208 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
209
210/* Constant strings for known chunk types. If you need to add a chunk,
211 * define the name here, and add an invocation of the macro wherever it's
212 * needed.
213 */
214#define PNG_IHDR PNG_CONST png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
215#define PNG_IDAT PNG_CONST png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
216#define PNG_IEND PNG_CONST png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
217#define PNG_PLTE PNG_CONST png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
218#define PNG_bKGD PNG_CONST png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
219#define PNG_cHRM PNG_CONST png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
220#define PNG_gAMA PNG_CONST png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
221#define PNG_hIST PNG_CONST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
222#define PNG_iCCP PNG_CONST png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
223#define PNG_iTXt PNG_CONST png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
224#define PNG_oFFs PNG_CONST png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
225#define PNG_pCAL PNG_CONST png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
226#define PNG_sCAL PNG_CONST png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
227#define PNG_pHYs PNG_CONST png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
228#define PNG_sBIT PNG_CONST png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
229#define PNG_sPLT PNG_CONST png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
230#define PNG_sRGB PNG_CONST png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
231#define PNG_sTER PNG_CONST png_byte png_sTER[5] = {115, 84, 69, 82, '\0'}
232#define PNG_tEXt PNG_CONST png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
233#define PNG_tIME PNG_CONST png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
234#define PNG_tRNS PNG_CONST png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
235#define PNG_zTXt PNG_CONST png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
236
237
238/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
239#ifdef __cplusplus
240extern "C" {
241#endif /* __cplusplus */
242
243/* These functions are used internally in the code. They generally
244 * shouldn't be used unless you are writing code to add or replace some
245 * functionality in libpng. More information about most functions can
246 * be found in the files where the functions are located.
247 */
248
249/* Allocate memory for an internal libpng struct */
250PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
251
252/* Free memory from internal libpng struct */
253PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
254
255PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
256 malloc_fn, png_voidp mem_ptr));
257PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
258 png_free_ptr free_fn, png_voidp mem_ptr));
259
260/* Free any memory that info_ptr points to and reset struct. */
261PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
262 png_infop info_ptr));
263
264/* Function to allocate memory for zlib. PNGAPI is disallowed. */
265PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
266
267/* Function to free memory for zlib. PNGAPI is disallowed. */
268PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
269
270/* Next four functions are used internally as callbacks. PNGAPI is required
271 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
272
273PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
274 png_bytep data, png_size_t length));
275
276#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
277PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
278 png_bytep buffer, png_size_t length));
279#endif
280
281PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
282 png_bytep data, png_size_t length));
283
284#ifdef PNG_WRITE_FLUSH_SUPPORTED
285#ifdef PNG_STDIO_SUPPORTED
286PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
287#endif
288#endif
289
290/* Reset the CRC variable */
291PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
292
293/* Write the "data" buffer to whatever output you are using */
294PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
295 png_size_t length));
296
297/* Read the chunk header (length + type name) */
298PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
299
300/* Read data from whatever input you are using into the "data" buffer */
301PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
302 png_size_t length));
303
304/* Read bytes into buf, and update png_ptr->crc */
305PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
306 png_size_t length));
307
308/* Decompress data in a chunk that uses compression */
309#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
310 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
311PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
312 int comp_type, png_size_t chunklength, png_size_t prefix_length,
313 png_size_t *data_length));
314#endif
315
316/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
317PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
318
319/* Read the CRC from the file and compare it to the libpng calculated CRC */
320PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
321
322/* Calculate the CRC over a section of data. Note that we are only
323 * passing a maximum of 64K on systems that have this as a memory limit,
324 * since this is the maximum buffer size we can specify.
325 */
326PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
327 png_size_t length));
328
329#ifdef PNG_WRITE_FLUSH_SUPPORTED
330PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
331#endif
332
333/* Write various chunks */
334
335/* Write the IHDR chunk, and update the png_struct with the necessary
336 * information.
337 */
338PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
339 png_uint_32 height,
340 int bit_depth, int color_type, int compression_method, int filter_method,
341 int interlace_method));
342
343PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
344 png_uint_32 num_pal));
345
346PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
347 png_size_t length));
348
349PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
350
351#ifdef PNG_WRITE_gAMA_SUPPORTED
352#ifdef PNG_FLOATING_POINT_SUPPORTED
353PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
354#endif
355#ifdef PNG_FIXED_POINT_SUPPORTED
356PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
357 file_gamma));
358#endif
359#endif
360
361#ifdef PNG_WRITE_sBIT_SUPPORTED
362PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
363 int color_type));
364#endif
365
366#ifdef PNG_WRITE_cHRM_SUPPORTED
367#ifdef PNG_FLOATING_POINT_SUPPORTED
368PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
369 double white_x, double white_y,
370 double red_x, double red_y, double green_x, double green_y,
371 double blue_x, double blue_y));
372#endif
373PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
374 png_fixed_point int_white_x, png_fixed_point int_white_y,
375 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
376 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
377 png_fixed_point int_blue_y));
378#endif
379
380#ifdef PNG_WRITE_sRGB_SUPPORTED
381PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
382 int intent));
383#endif
384
385#ifdef PNG_WRITE_iCCP_SUPPORTED
386PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
387 png_charp name, int compression_type,
388 png_charp profile, int proflen));
389 /* Note to maintainer: profile should be png_bytep */
390#endif
391
392#ifdef PNG_WRITE_sPLT_SUPPORTED
393PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
394 png_sPLT_tp palette));
395#endif
396
397#ifdef PNG_WRITE_tRNS_SUPPORTED
398PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
399 png_color_16p values, int number, int color_type));
400#endif
401
402#ifdef PNG_WRITE_bKGD_SUPPORTED
403PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
404 png_color_16p values, int color_type));
405#endif
406
407#ifdef PNG_WRITE_hIST_SUPPORTED
408PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
409 int num_hist));
410#endif
411
412#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
413 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
414PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
415 png_charp key, png_charpp new_key));
416#endif
417
418#ifdef PNG_WRITE_tEXt_SUPPORTED
419PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
420 png_charp text, png_size_t text_len));
421#endif
422
423#ifdef PNG_WRITE_zTXt_SUPPORTED
424PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
425 png_charp text, png_size_t text_len, int compression));
426#endif
427
428#ifdef PNG_WRITE_iTXt_SUPPORTED
429PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
430 int compression, png_charp key, png_charp lang, png_charp lang_key,
431 png_charp text));
432#endif
433
434#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
435PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
436 png_infop info_ptr, png_textp text_ptr, int num_text));
437#endif
438
439#ifdef PNG_WRITE_oFFs_SUPPORTED
440PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
441 png_int_32 x_offset, png_int_32 y_offset, int unit_type));
442#endif
443
444#ifdef PNG_WRITE_pCAL_SUPPORTED
445PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
446 png_int_32 X0, png_int_32 X1, int type, int nparams,
447 png_charp units, png_charpp params));
448#endif
449
450#ifdef PNG_WRITE_pHYs_SUPPORTED
451PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
452 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
453 int unit_type));
454#endif
455
456#ifdef PNG_WRITE_tIME_SUPPORTED
457PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
458 png_timep mod_time));
459#endif
460
461#ifdef PNG_WRITE_sCAL_SUPPORTED
462#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
463PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
464 int unit, double width, double height));
465#else
466#ifdef PNG_FIXED_POINT_SUPPORTED
467PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
468 int unit, png_charp width, png_charp height));
469#endif
470#endif
471#endif
472
473/* Called when finished processing a row of data */
474PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
475
476/* Internal use only. Called before first row of data */
477PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
478
479#ifdef PNG_READ_GAMMA_SUPPORTED
480PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
481 png_byte bit_depth));
482#endif
483
484/* Combine a row of data, dealing with alpha, etc. if requested */
485PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
486 int mask));
487
488#ifdef PNG_READ_INTERLACING_SUPPORTED
489/* Expand an interlaced row */
490/* OLD pre-1.0.9 interface:
491PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
492 png_bytep row, int pass, png_uint_32 transformations));
493 */
494PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
495#endif
496
497/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
498
499#ifdef PNG_WRITE_INTERLACING_SUPPORTED
500/* Grab pixels out of a row for an interlaced pass */
501PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
502 png_bytep row, int pass));
503#endif
504
505/* Unfilter a row */
506PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
507 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
508
509/* Choose the best filter to use and filter the row data */
510PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
511 png_row_infop row_info));
512
513/* Write out the filtered row. */
514PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
515 png_bytep filtered_row));
516/* Finish a row while reading, dealing with interlacing passes, etc. */
517PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
518
519/* Initialize the row buffers, etc. */
520PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
521/* Optional call to update the users info structure */
522PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
523 png_infop info_ptr));
524
525/* These are the functions that do the transformations */
526#ifdef PNG_READ_FILLER_SUPPORTED
527PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
528 png_bytep row, png_uint_32 filler, png_uint_32 flags));
529#endif
530
531#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
532PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
533 png_bytep row));
534#endif
535
536#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
537PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
538 png_bytep row));
539#endif
540
541#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
542PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
543 png_bytep row));
544#endif
545
546#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
547PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
548 png_bytep row));
549#endif
550
551#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
552 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
553PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
554 png_bytep row, png_uint_32 flags));
555#endif
556
557#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
558PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
559#endif
560
561#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
562PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
563#endif
564
565#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
566PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
567 row_info, png_bytep row));
568#endif
569
570#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
571PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
572 png_bytep row));
573#endif
574
575#ifdef PNG_READ_PACK_SUPPORTED
576PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
577#endif
578
579#ifdef PNG_READ_SHIFT_SUPPORTED
580PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
581 png_color_8p sig_bits));
582#endif
583
584#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
585PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
586#endif
587
588#ifdef PNG_READ_16_TO_8_SUPPORTED
589PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
590#endif
591
592#ifdef PNG_READ_DITHER_SUPPORTED
593PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
594 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
595
596# ifdef PNG_CORRECT_PALETTE_SUPPORTED
597PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
598 png_colorp palette, int num_palette));
599# endif
600#endif
601
602#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
603PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
604#endif
605
606#ifdef PNG_WRITE_PACK_SUPPORTED
607PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
608 png_bytep row, png_uint_32 bit_depth));
609#endif
610
611#ifdef PNG_WRITE_SHIFT_SUPPORTED
612PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
613 png_color_8p bit_depth));
614#endif
615
616#ifdef PNG_READ_BACKGROUND_SUPPORTED
617#ifdef PNG_READ_GAMMA_SUPPORTED
618PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
619 png_color_16p trans_color, png_color_16p background,
620 png_color_16p background_1,
621 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
622 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
623 png_uint_16pp gamma_16_to_1, int gamma_shift));
624#else
625PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
626 png_color_16p trans_color, png_color_16p background));
627#endif
628#endif
629
630#ifdef PNG_READ_GAMMA_SUPPORTED
631PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
632 png_bytep gamma_table, png_uint_16pp gamma_16_table,
633 int gamma_shift));
634#endif
635
636#ifdef PNG_READ_EXPAND_SUPPORTED
637PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
638 png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
639PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
640 png_bytep row, png_color_16p trans_value));
641#endif
642
643/* The following decodes the appropriate chunks, and does error correction,
644 * then calls the appropriate callback for the chunk if it is valid.
645 */
646
647/* Decode the IHDR chunk */
648PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
649 png_uint_32 length));
650PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
651 png_uint_32 length));
652PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
653 png_uint_32 length));
654
655#ifdef PNG_READ_bKGD_SUPPORTED
656PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
657 png_uint_32 length));
658#endif
659
660#ifdef PNG_READ_cHRM_SUPPORTED
661PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
662 png_uint_32 length));
663#endif
664
665#ifdef PNG_READ_gAMA_SUPPORTED
666PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
667 png_uint_32 length));
668#endif
669
670#ifdef PNG_READ_hIST_SUPPORTED
671PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
672 png_uint_32 length));
673#endif
674
675#ifdef PNG_READ_iCCP_SUPPORTED
676extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
677 png_uint_32 length));
678#endif /* PNG_READ_iCCP_SUPPORTED */
679
680#ifdef PNG_READ_iTXt_SUPPORTED
681PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
682 png_uint_32 length));
683#endif
684
685#ifdef PNG_READ_oFFs_SUPPORTED
686PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
687 png_uint_32 length));
688#endif
689
690#ifdef PNG_READ_pCAL_SUPPORTED
691PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
692 png_uint_32 length));
693#endif
694
695#ifdef PNG_READ_pHYs_SUPPORTED
696PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
697 png_uint_32 length));
698#endif
699
700#ifdef PNG_READ_sBIT_SUPPORTED
701PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
702 png_uint_32 length));
703#endif
704
705#ifdef PNG_READ_sCAL_SUPPORTED
706PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
707 png_uint_32 length));
708#endif
709
710#ifdef PNG_READ_sPLT_SUPPORTED
711extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
712 png_uint_32 length));
713#endif /* PNG_READ_sPLT_SUPPORTED */
714
715#ifdef PNG_READ_sRGB_SUPPORTED
716PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
717 png_uint_32 length));
718#endif
719
720#ifdef PNG_READ_tEXt_SUPPORTED
721PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
722 png_uint_32 length));
723#endif
724
725#ifdef PNG_READ_tIME_SUPPORTED
726PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
727 png_uint_32 length));
728#endif
729
730#ifdef PNG_READ_tRNS_SUPPORTED
731PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
732 png_uint_32 length));
733#endif
734
735#ifdef PNG_READ_zTXt_SUPPORTED
736PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
737 png_uint_32 length));
738#endif
739
740PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
741 png_infop info_ptr, png_uint_32 length));
742
743PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
744 png_bytep chunk_name));
745
746/* Handle the transformations for reading and writing */
747PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
748PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
749
750PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
751
752#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
753PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
754 png_infop info_ptr));
755PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
756 png_infop info_ptr));
757PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
758PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
759 png_uint_32 length));
760PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
761PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
762PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
763 png_bytep buffer, png_size_t buffer_length));
764PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
765PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
766 png_bytep buffer, png_size_t buffer_length));
767PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
768PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
769 png_infop info_ptr, png_uint_32 length));
770PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
771 png_infop info_ptr));
772PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
773 png_infop info_ptr));
774PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
775PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
776 png_infop info_ptr));
777PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
778 png_infop info_ptr));
779PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
780#ifdef PNG_READ_tEXt_SUPPORTED
781PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
782 png_infop info_ptr, png_uint_32 length));
783PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
784 png_infop info_ptr));
785#endif
786#ifdef PNG_READ_zTXt_SUPPORTED
787PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
788 png_infop info_ptr, png_uint_32 length));
789PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
790 png_infop info_ptr));
791#endif
792#ifdef PNG_READ_iTXt_SUPPORTED
793PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
794 png_infop info_ptr, png_uint_32 length));
795PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
796 png_infop info_ptr));
797#endif
798
799#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
800
801#ifdef PNG_MNG_FEATURES_SUPPORTED
802PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
803 png_bytep row));
804PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
805 png_bytep row));
806#endif
807
808/* Added at libpng version 1.4.0 */
809#ifdef PNG_cHRM_SUPPORTED
810PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
811 png_fixed_point int_white_x, png_fixed_point int_white_y,
812 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
813 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
814 png_fixed_point int_blue_y));
815#endif
816
817#ifdef PNG_cHRM_SUPPORTED
818#ifdef PNG_CHECK_cHRM_SUPPORTED
819/* Added at libpng version 1.2.34 and 1.4.0 */
820PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,
821 unsigned long *hi_product, unsigned long *lo_product));
822#endif
823#endif
824
825/* Added at libpng version 1.4.0 */
826PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
827 png_uint_32 width, png_uint_32 height, int bit_depth,
828 int color_type, int interlace_type, int compression_type,
829 int filter_type));
830
831/* Free all memory used by the read (old method - NOT DLL EXPORTED) */
832extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
833 png_infop end_info_ptr));
834
835/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
836extern void png_write_destroy PNGARG((png_structp png_ptr));
837
838#ifdef USE_FAR_KEYWORD /* memory model conversion function */
839extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
840 int check));
841#endif /* USE_FAR_KEYWORD */
842
843/* Define PNG_DEBUG at compile time for debugging information. Higher
844 * numbers for PNG_DEBUG mean more debugging information. This has
845 * only been added since version 0.95 so it is not implemented throughout
846 * libpng yet, but more support will be added as needed.
847 */
848#ifdef PNG_DEBUG
849#if (PNG_DEBUG > 0)
850#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
851#include <crtdbg.h>
852#if (PNG_DEBUG > 1)
853#ifndef _DEBUG
854# define _DEBUG
855#endif
856#ifndef png_debug
857#define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
858#endif
859#ifndef png_debug1
860#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
861#endif
862#ifndef png_debug2
863#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
864#endif
865#endif
866#else /* PNG_DEBUG_FILE || !_MSC_VER */
867#ifndef PNG_DEBUG_FILE
868#define PNG_DEBUG_FILE stderr
869#endif /* PNG_DEBUG_FILE */
870
871#if (PNG_DEBUG > 1)
872/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on
873 * non-ISO compilers
874 */
875# ifdef __STDC__
876# ifndef png_debug
877# define png_debug(l,m) \
878 { \
879 int num_tabs=l; \
880 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
881 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
882 }
883# endif
884# ifndef png_debug1
885# define png_debug1(l,m,p1) \
886 { \
887 int num_tabs=l; \
888 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
889 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
890 }
891# endif
892# ifndef png_debug2
893# define png_debug2(l,m,p1,p2) \
894 { \
895 int num_tabs=l; \
896 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
897 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
898 }
899# endif
900# else /* __STDC __ */
901# ifndef png_debug
902# define png_debug(l,m) \
903 { \
904 int num_tabs=l; \
905 char format[256]; \
906 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
907 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
908 m,PNG_STRING_NEWLINE); \
909 fprintf(PNG_DEBUG_FILE,format); \
910 }
911# endif
912# ifndef png_debug1
913# define png_debug1(l,m,p1) \
914 { \
915 int num_tabs=l; \
916 char format[256]; \
917 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
918 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
919 m,PNG_STRING_NEWLINE); \
920 fprintf(PNG_DEBUG_FILE,format,p1); \
921 }
922# endif
923# ifndef png_debug2
924# define png_debug2(l,m,p1,p2) \
925 { \
926 int num_tabs=l; \
927 char format[256]; \
928 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
929 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
930 m,PNG_STRING_NEWLINE); \
931 fprintf(PNG_DEBUG_FILE,format,p1,p2); \
932 }
933# endif
934# endif /* __STDC __ */
935#endif /* (PNG_DEBUG > 1) */
936
937#endif /* _MSC_VER */
938#endif /* (PNG_DEBUG > 0) */
939#endif /* PNG_DEBUG */
940#ifndef png_debug
941#define png_debug(l, m)
942#endif
943#ifndef png_debug1
944#define png_debug1(l, m, p1)
945#endif
946#ifndef png_debug2
947#define png_debug2(l, m, p1, p2)
948#endif
949
950/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
951
952#ifdef __cplusplus
953}
954#endif
955
956#endif /* PNG_VERSION_INFO_ONLY */
957#endif /* PNGPRIV_H */
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