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1
2/* pngpriv.h - private declarations for use inside libpng
3 *
4 * libpng version 1.4.4 - September 23, 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#ifndef PNG_EXTERN
32/* The functions exported by PNG_EXTERN are internal functions, which
33 * aren't usually used outside the library (as far as I know), so it is
34 * debatable if they should be exported at all. In the future, when it
35 * is possible to have run-time registry of chunk-handling functions,
36 * some of these will be made available again.
37# define PNG_EXTERN extern
38 */
39# define PNG_EXTERN
40#endif
41
42/* Other defines specific to compilers can go here. Try to keep
43 * them inside an appropriate ifdef/endif pair for portability.
44 */
45
46#ifdef PNG_FLOATING_POINT_SUPPORTED
47# if defined(MACOS) && !wxOSX_USE_IPHONE
48 /* We need to check that <math.h> hasn't already been included earlier
49 * as it seems it doesn't agree with <fp.h>, yet we should really use
50 * <fp.h> if possible.
51 */
52# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
53# include <fp.h>
54# endif
55# else
56# include <math.h>
57# endif
58# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
59 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
60 * MATH=68881
61 */
62# include <m68881.h>
63# endif
64#endif
65
66/* Codewarrior on NT has linking problems without this. */
67#if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__)
68# define PNG_ALWAYS_EXTERN
69#endif
70
71/* This provides the non-ANSI (far) memory allocation routines. */
72#if defined(__TURBOC__) && defined(__MSDOS__)
73# include <mem.h>
74# include <alloc.h>
75#endif
76
77#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
78 defined(_WIN32) || defined(__WIN32__)
79# include <windows.h> /* defines _WINDOWS_ macro */
80#endif
81
82/* Various modes of operation. Note that after an init, mode is set to
83 * zero automatically when the structure is created.
84 */
85#define PNG_HAVE_IHDR 0x01
86#define PNG_HAVE_PLTE 0x02
87#define PNG_HAVE_IDAT 0x04
88#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
89#define PNG_HAVE_IEND 0x10
90#define PNG_HAVE_gAMA 0x20
91#define PNG_HAVE_cHRM 0x40
92#define PNG_HAVE_sRGB 0x80
93#define PNG_HAVE_CHUNK_HEADER 0x100
94#define PNG_WROTE_tIME 0x200
95#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
96#define PNG_BACKGROUND_IS_GRAY 0x800
97#define PNG_HAVE_PNG_SIGNATURE 0x1000
98#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
99
100/* Flags for the transformations the PNG library does on the image data */
101#define PNG_BGR 0x0001
102#define PNG_INTERLACE 0x0002
103#define PNG_PACK 0x0004
104#define PNG_SHIFT 0x0008
105#define PNG_SWAP_BYTES 0x0010
106#define PNG_INVERT_MONO 0x0020
107#define PNG_QUANTIZE 0x0040 /* formerly PNG_DITHER */
108#define PNG_BACKGROUND 0x0080
109#define PNG_BACKGROUND_EXPAND 0x0100
110 /* 0x0200 unused */
111#define PNG_16_TO_8 0x0400
112#define PNG_RGBA 0x0800
113#define PNG_EXPAND 0x1000
114#define PNG_GAMMA 0x2000
115#define PNG_GRAY_TO_RGB 0x4000
116#define PNG_FILLER 0x8000L
117#define PNG_PACKSWAP 0x10000L
118#define PNG_SWAP_ALPHA 0x20000L
119#define PNG_STRIP_ALPHA 0x40000L
120#define PNG_INVERT_ALPHA 0x80000L
121#define PNG_USER_TRANSFORM 0x100000L
122#define PNG_RGB_TO_GRAY_ERR 0x200000L
123#define PNG_RGB_TO_GRAY_WARN 0x400000L
124#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
125 /* 0x800000L Unused */
126#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
127#define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
128 /* 0x4000000L unused */
129 /* 0x8000000L unused */
130 /* 0x10000000L unused */
131 /* 0x20000000L unused */
132 /* 0x40000000L unused */
133
134/* Flags for png_create_struct */
135#define PNG_STRUCT_PNG 0x0001
136#define PNG_STRUCT_INFO 0x0002
137
138/* Scaling factor for filter heuristic weighting calculations */
139#define PNG_WEIGHT_SHIFT 8
140#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
141#define PNG_COST_SHIFT 3
142#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
143
144/* Flags for the png_ptr->flags rather than declaring a byte for each one */
145#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
146#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
147#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
148#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
149#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
150#define PNG_FLAG_ZLIB_FINISHED 0x0020
151#define PNG_FLAG_ROW_INIT 0x0040
152#define PNG_FLAG_FILLER_AFTER 0x0080
153#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
154#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
155#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
156#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
157 /* 0x1000 unused */
158 /* 0x2000 unused */
159 /* 0x4000 unused */
160#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
161#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
162#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
163#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
164#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
165#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
166#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
167#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
168#define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000L /* Added to libpng-1.4.0 */
169 /* 0x1000000L unused */
170 /* 0x2000000L unused */
171 /* 0x4000000L unused */
172 /* 0x8000000L unused */
173 /* 0x10000000L unused */
174 /* 0x20000000L unused */
175 /* 0x40000000L unused */
176
177#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
178 PNG_FLAG_CRC_ANCILLARY_NOWARN)
179
180#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
181 PNG_FLAG_CRC_CRITICAL_IGNORE)
182
183#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
184 PNG_FLAG_CRC_CRITICAL_MASK)
185
186/* Save typing and make code easier to understand */
187
188#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
189 abs((int)((c1).green) - (int)((c2).green)) + \
190 abs((int)((c1).blue) - (int)((c2).blue)))
191
192/* Added to libpng-1.2.6 JB */
193#define PNG_ROWBYTES(pixel_bits, width) \
194 ((pixel_bits) >= 8 ? \
195 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
196 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
197
198/* PNG_OUT_OF_RANGE returns true if value is outside the range
199 * ideal-delta..ideal+delta. Each argument is evaluated twice.
200 * "ideal" and "delta" should be constants, normally simple
201 * integers, "value" a variable. Added to libpng-1.2.6 JB
202 */
203#define PNG_OUT_OF_RANGE(value, ideal, delta) \
204 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
205
206/* Constant strings for known chunk types. If you need to add a chunk,
207 * define the name here, and add an invocation of the macro wherever it's
208 * needed.
209 */
210#define PNG_IHDR PNG_CONST png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
211#define PNG_IDAT PNG_CONST png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
212#define PNG_IEND PNG_CONST png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
213#define PNG_PLTE PNG_CONST png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
214#define PNG_bKGD PNG_CONST png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
215#define PNG_cHRM PNG_CONST png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
216#define PNG_gAMA PNG_CONST png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
217#define PNG_hIST PNG_CONST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
218#define PNG_iCCP PNG_CONST png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
219#define PNG_iTXt PNG_CONST png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
220#define PNG_oFFs PNG_CONST png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
221#define PNG_pCAL PNG_CONST png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
222#define PNG_sCAL PNG_CONST png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
223#define PNG_pHYs PNG_CONST png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
224#define PNG_sBIT PNG_CONST png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
225#define PNG_sPLT PNG_CONST png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
226#define PNG_sRGB PNG_CONST png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
227#define PNG_sTER PNG_CONST png_byte png_sTER[5] = {115, 84, 69, 82, '\0'}
228#define PNG_tEXt PNG_CONST png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
229#define PNG_tIME PNG_CONST png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
230#define PNG_tRNS PNG_CONST png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
231#define PNG_zTXt PNG_CONST png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
232
233
234/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
235#ifdef __cplusplus
236extern "C" {
237#endif /* __cplusplus */
238
239/* These functions are used internally in the code. They generally
240 * shouldn't be used unless you are writing code to add or replace some
241 * functionality in libpng. More information about most functions can
242 * be found in the files where the functions are located.
243 */
244
245/* Allocate memory for an internal libpng struct */
246PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
247
248/* Free memory from internal libpng struct */
249PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
250
251PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
252 malloc_fn, png_voidp mem_ptr));
253PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
254 png_free_ptr free_fn, png_voidp mem_ptr));
255
256/* Free any memory that info_ptr points to and reset struct. */
257PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
258 png_infop info_ptr));
259
260/* Function to allocate memory for zlib. PNGAPI is disallowed. */
261PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
262
263/* Function to free memory for zlib. PNGAPI is disallowed. */
264PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
265
266/* Next four functions are used internally as callbacks. PNGAPI is required
267 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
268
269PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
270 png_bytep data, png_size_t length));
271
272#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
273PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
274 png_bytep buffer, png_size_t length));
275#endif
276
277PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
278 png_bytep data, png_size_t length));
279
280#ifdef PNG_WRITE_FLUSH_SUPPORTED
281#ifdef PNG_STDIO_SUPPORTED
282PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
283#endif
284#endif
285
286/* Reset the CRC variable */
287PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
288
289/* Write the "data" buffer to whatever output you are using */
290PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
291 png_size_t length));
292
293/* Read the chunk header (length + type name) */
294PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
295
296/* Read data from whatever input you are using into the "data" buffer */
297PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
298 png_size_t length));
299
300/* Read bytes into buf, and update png_ptr->crc */
301PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
302 png_size_t length));
303
304/* Decompress data in a chunk that uses compression */
305#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
306 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
307PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
308 int comp_type, png_size_t chunklength, png_size_t prefix_length,
309 png_size_t *data_length));
310#endif
311
312/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
313PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
314
315/* Read the CRC from the file and compare it to the libpng calculated CRC */
316PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
317
318/* Calculate the CRC over a section of data. Note that we are only
319 * passing a maximum of 64K on systems that have this as a memory limit,
320 * since this is the maximum buffer size we can specify.
321 */
322PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
323 png_size_t length));
324
325#ifdef PNG_WRITE_FLUSH_SUPPORTED
326PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
327#endif
328
329/* Write various chunks */
330
331/* Write the IHDR chunk, and update the png_struct with the necessary
332 * information.
333 */
334PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
335 png_uint_32 height,
336 int bit_depth, int color_type, int compression_method, int filter_method,
337 int interlace_method));
338
339PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
340 png_uint_32 num_pal));
341
342PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
343 png_size_t length));
344
345PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
346
347#ifdef PNG_WRITE_gAMA_SUPPORTED
348#ifdef PNG_FLOATING_POINT_SUPPORTED
349PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
350#endif
351#ifdef PNG_FIXED_POINT_SUPPORTED
352PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr,
353 png_fixed_point file_gamma));
354#endif
355#endif
356
357#ifdef PNG_WRITE_sBIT_SUPPORTED
358PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
359 int color_type));
360#endif
361
362#ifdef PNG_WRITE_cHRM_SUPPORTED
363#ifdef PNG_FLOATING_POINT_SUPPORTED
364PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
365 double white_x, double white_y,
366 double red_x, double red_y, double green_x, double green_y,
367 double blue_x, double blue_y));
368#endif
369PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
370 png_fixed_point int_white_x, png_fixed_point int_white_y,
371 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
372 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
373 png_fixed_point int_blue_y));
374#endif
375
376#ifdef PNG_WRITE_sRGB_SUPPORTED
377PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
378 int intent));
379#endif
380
381#ifdef PNG_WRITE_iCCP_SUPPORTED
382PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
383 png_charp name, int compression_type,
384 png_charp profile, int proflen));
385 /* Note to maintainer: profile should be png_bytep */
386#endif
387
388#ifdef PNG_WRITE_sPLT_SUPPORTED
389PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
390 png_sPLT_tp palette));
391#endif
392
393#ifdef PNG_WRITE_tRNS_SUPPORTED
394PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
395 png_color_16p values, int number, int color_type));
396#endif
397
398#ifdef PNG_WRITE_bKGD_SUPPORTED
399PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
400 png_color_16p values, int color_type));
401#endif
402
403#ifdef PNG_WRITE_hIST_SUPPORTED
404PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
405 int num_hist));
406#endif
407
408#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
409 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
410PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
411 png_charp key, png_charpp new_key));
412#endif
413
414#ifdef PNG_WRITE_tEXt_SUPPORTED
415PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
416 png_charp text, png_size_t text_len));
417#endif
418
419#ifdef PNG_WRITE_zTXt_SUPPORTED
420PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
421 png_charp text, png_size_t text_len, int compression));
422#endif
423
424#ifdef PNG_WRITE_iTXt_SUPPORTED
425PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
426 int compression, png_charp key, png_charp lang, png_charp lang_key,
427 png_charp text));
428#endif
429
430#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
431PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
432 png_infop info_ptr, png_textp text_ptr, int num_text));
433#endif
434
435#ifdef PNG_WRITE_oFFs_SUPPORTED
436PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
437 png_int_32 x_offset, png_int_32 y_offset, int unit_type));
438#endif
439
440#ifdef PNG_WRITE_pCAL_SUPPORTED
441PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
442 png_int_32 X0, png_int_32 X1, int type, int nparams,
443 png_charp units, png_charpp params));
444#endif
445
446#ifdef PNG_WRITE_pHYs_SUPPORTED
447PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
448 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
449 int unit_type));
450#endif
451
452#ifdef PNG_WRITE_tIME_SUPPORTED
453PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
454 png_timep mod_time));
455#endif
456
457#ifdef PNG_WRITE_sCAL_SUPPORTED
458#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
459PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
460 int unit, double width, double height));
461#else
462#ifdef PNG_FIXED_POINT_SUPPORTED
463PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
464 int unit, png_charp width, png_charp height));
465#endif
466#endif
467#endif
468
469/* Called when finished processing a row of data */
470PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
471
472/* Internal use only. Called before first row of data */
473PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
474
475#ifdef PNG_READ_GAMMA_SUPPORTED
476PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
477 png_byte bit_depth));
478#endif
479
480/* Combine a row of data, dealing with alpha, etc. if requested */
481PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
482 int mask));
483
484#ifdef PNG_READ_INTERLACING_SUPPORTED
485/* Expand an interlaced row */
486/* OLD pre-1.0.9 interface:
487PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
488 png_bytep row, int pass, png_uint_32 transformations));
489 */
490PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
491#endif
492
493/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
494
495#ifdef PNG_WRITE_INTERLACING_SUPPORTED
496/* Grab pixels out of a row for an interlaced pass */
497PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
498 png_bytep row, int pass));
499#endif
500
501/* Unfilter a row */
502PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
503 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
504
505/* Choose the best filter to use and filter the row data */
506PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
507 png_row_infop row_info));
508
509/* Write out the filtered row. */
510PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
511 png_bytep filtered_row));
512/* Finish a row while reading, dealing with interlacing passes, etc. */
513PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
514
515/* Initialize the row buffers, etc. */
516PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
517/* Optional call to update the users info structure */
518PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
519 png_infop info_ptr));
520
521/* These are the functions that do the transformations */
522#ifdef PNG_READ_FILLER_SUPPORTED
523PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
524 png_bytep row, png_uint_32 filler, png_uint_32 flags));
525#endif
526
527#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
528PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
529 png_bytep row));
530#endif
531
532#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
533PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
534 png_bytep row));
535#endif
536
537#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
538PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
539 png_bytep row));
540#endif
541
542#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
543PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
544 png_bytep row));
545#endif
546
547#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
548 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
549PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
550 png_bytep row, png_uint_32 flags));
551#endif
552
553#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
554PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
555#endif
556
557#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
558 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
559PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
560#endif
561
562#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
563PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
564 row_info, png_bytep row));
565#endif
566
567#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
568PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
569 png_bytep row));
570#endif
571
572#ifdef PNG_READ_PACK_SUPPORTED
573PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
574#endif
575
576#ifdef PNG_READ_SHIFT_SUPPORTED
577PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
578 png_color_8p sig_bits));
579#endif
580
581#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
582PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
583#endif
584
585#ifdef PNG_READ_16_TO_8_SUPPORTED
586PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
587#endif
588
589#ifdef PNG_READ_QUANTIZE_SUPPORTED
590PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info,
591 png_bytep row, png_bytep palette_lookup, png_bytep quantize_lookup));
592
593# ifdef PNG_CORRECT_PALETTE_SUPPORTED
594PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
595 png_colorp palette, int num_palette));
596# endif
597#endif
598
599#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
600PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
601#endif
602
603#ifdef PNG_WRITE_PACK_SUPPORTED
604PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
605 png_bytep row, png_uint_32 bit_depth));
606#endif
607
608#ifdef PNG_WRITE_SHIFT_SUPPORTED
609PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
610 png_color_8p bit_depth));
611#endif
612
613#ifdef PNG_READ_BACKGROUND_SUPPORTED
614#ifdef PNG_READ_GAMMA_SUPPORTED
615PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
616 png_color_16p trans_color, png_color_16p background,
617 png_color_16p background_1,
618 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
619 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
620 png_uint_16pp gamma_16_to_1, int gamma_shift));
621#else
622PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
623 png_color_16p trans_color, png_color_16p background));
624#endif
625#endif
626
627#ifdef PNG_READ_GAMMA_SUPPORTED
628PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
629 png_bytep gamma_table, png_uint_16pp gamma_16_table,
630 int gamma_shift));
631#endif
632
633#ifdef PNG_READ_EXPAND_SUPPORTED
634PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
635 png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
636PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
637 png_bytep row, png_color_16p trans_value));
638#endif
639
640/* The following decodes the appropriate chunks, and does error correction,
641 * then calls the appropriate callback for the chunk if it is valid.
642 */
643
644/* Decode the IHDR chunk */
645PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
646 png_uint_32 length));
647PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
648 png_uint_32 length));
649PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
650 png_uint_32 length));
651
652#ifdef PNG_READ_bKGD_SUPPORTED
653PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
654 png_uint_32 length));
655#endif
656
657#ifdef PNG_READ_cHRM_SUPPORTED
658PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
659 png_uint_32 length));
660#endif
661
662#ifdef PNG_READ_gAMA_SUPPORTED
663PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
664 png_uint_32 length));
665#endif
666
667#ifdef PNG_READ_hIST_SUPPORTED
668PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
669 png_uint_32 length));
670#endif
671
672#ifdef PNG_READ_iCCP_SUPPORTED
673PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
674 png_uint_32 length));
675#endif /* PNG_READ_iCCP_SUPPORTED */
676
677#ifdef PNG_READ_iTXt_SUPPORTED
678PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
679 png_uint_32 length));
680#endif
681
682#ifdef PNG_READ_oFFs_SUPPORTED
683PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
684 png_uint_32 length));
685#endif
686
687#ifdef PNG_READ_pCAL_SUPPORTED
688PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
689 png_uint_32 length));
690#endif
691
692#ifdef PNG_READ_pHYs_SUPPORTED
693PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
694 png_uint_32 length));
695#endif
696
697#ifdef PNG_READ_sBIT_SUPPORTED
698PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
699 png_uint_32 length));
700#endif
701
702#ifdef PNG_READ_sCAL_SUPPORTED
703PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
704 png_uint_32 length));
705#endif
706
707#ifdef PNG_READ_sPLT_SUPPORTED
708PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
709 png_uint_32 length));
710#endif /* PNG_READ_sPLT_SUPPORTED */
711
712#ifdef PNG_READ_sRGB_SUPPORTED
713PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
714 png_uint_32 length));
715#endif
716
717#ifdef PNG_READ_tEXt_SUPPORTED
718PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
719 png_uint_32 length));
720#endif
721
722#ifdef PNG_READ_tIME_SUPPORTED
723PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
724 png_uint_32 length));
725#endif
726
727#ifdef PNG_READ_tRNS_SUPPORTED
728PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
729 png_uint_32 length));
730#endif
731
732#ifdef PNG_READ_zTXt_SUPPORTED
733PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
734 png_uint_32 length));
735#endif
736
737PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
738 png_infop info_ptr, png_uint_32 length));
739
740PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
741 png_bytep chunk_name));
742
743/* Handle the transformations for reading and writing */
744PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
745PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
746
747PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
748
749#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
750PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
751 png_infop info_ptr));
752PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
753 png_infop info_ptr));
754PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
755PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
756 png_uint_32 length));
757PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
758PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
759PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
760 png_bytep buffer, png_size_t buffer_length));
761PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
762PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
763 png_bytep buffer, png_size_t buffer_length));
764PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
765PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
766 png_infop info_ptr, png_uint_32 length));
767PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
768 png_infop info_ptr));
769PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
770 png_infop info_ptr));
771PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
772PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
773 png_infop info_ptr));
774PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
775 png_infop info_ptr));
776PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
777#ifdef PNG_READ_tEXt_SUPPORTED
778PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
779 png_infop info_ptr, png_uint_32 length));
780PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
781 png_infop info_ptr));
782#endif
783#ifdef PNG_READ_zTXt_SUPPORTED
784PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
785 png_infop info_ptr, png_uint_32 length));
786PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
787 png_infop info_ptr));
788#endif
789#ifdef PNG_READ_iTXt_SUPPORTED
790PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
791 png_infop info_ptr, png_uint_32 length));
792PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
793 png_infop info_ptr));
794#endif
795
796#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
797
798#ifdef PNG_MNG_FEATURES_SUPPORTED
799PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
800 png_bytep row));
801PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
802 png_bytep row));
803#endif
804
805/* Added at libpng version 1.4.0 */
806#ifdef PNG_cHRM_SUPPORTED
807PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
808 png_fixed_point int_white_x, png_fixed_point int_white_y,
809 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
810 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
811 png_fixed_point int_blue_y));
812#endif
813
814#ifdef PNG_cHRM_SUPPORTED
815#ifdef PNG_CHECK_cHRM_SUPPORTED
816/* Added at libpng version 1.2.34 and 1.4.0 */
817PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,
818 unsigned long *hi_product, unsigned long *lo_product));
819#endif
820#endif
821
822/* Added at libpng version 1.4.0 */
823PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
824 png_uint_32 width, png_uint_32 height, int bit_depth,
825 int color_type, int interlace_type, int compression_type,
826 int filter_type));
827
828/* Free all memory used by the read (old method - NOT DLL EXPORTED) */
829PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
830 png_infop end_info_ptr));
831
832/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
833PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr));
834
835#ifdef USE_FAR_KEYWORD /* memory model conversion function */
836PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
837 int check));
838#endif /* USE_FAR_KEYWORD */
839
840/* Define PNG_DEBUG at compile time for debugging information. Higher
841 * numbers for PNG_DEBUG mean more debugging information. This has
842 * only been added since version 0.95 so it is not implemented throughout
843 * libpng yet, but more support will be added as needed.
844 */
845#ifdef PNG_DEBUG
846#if (PNG_DEBUG > 0)
847#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
848#include <crtdbg.h>
849#if (PNG_DEBUG > 1)
850#ifndef _DEBUG
851# define _DEBUG
852#endif
853#ifndef png_debug
854#define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
855#endif
856#ifndef png_debug1
857#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
858#endif
859#ifndef png_debug2
860#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
861#endif
862#endif
863#else /* PNG_DEBUG_FILE || !_MSC_VER */
864#ifndef PNG_DEBUG_FILE
865#define PNG_DEBUG_FILE stderr
866#endif /* PNG_DEBUG_FILE */
867
868#if (PNG_DEBUG > 1)
869/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on
870 * non-ISO compilers
871 */
872# ifdef __STDC__
873# ifndef png_debug
874# define png_debug(l,m) \
875 { \
876 int num_tabs=l; \
877 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
878 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
879 }
880# endif
881# ifndef png_debug1
882# define png_debug1(l,m,p1) \
883 { \
884 int num_tabs=l; \
885 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
886 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
887 }
888# endif
889# ifndef png_debug2
890# define png_debug2(l,m,p1,p2) \
891 { \
892 int num_tabs=l; \
893 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
894 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
895 }
896# endif
897# else /* __STDC __ */
898# ifndef png_debug
899# define png_debug(l,m) \
900 { \
901 int num_tabs=l; \
902 char format[256]; \
903 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
904 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
905 m,PNG_STRING_NEWLINE); \
906 fprintf(PNG_DEBUG_FILE,format); \
907 }
908# endif
909# ifndef png_debug1
910# define png_debug1(l,m,p1) \
911 { \
912 int num_tabs=l; \
913 char format[256]; \
914 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
915 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
916 m,PNG_STRING_NEWLINE); \
917 fprintf(PNG_DEBUG_FILE,format,p1); \
918 }
919# endif
920# ifndef png_debug2
921# define png_debug2(l,m,p1,p2) \
922 { \
923 int num_tabs=l; \
924 char format[256]; \
925 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
926 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
927 m,PNG_STRING_NEWLINE); \
928 fprintf(PNG_DEBUG_FILE,format,p1,p2); \
929 }
930# endif
931# endif /* __STDC __ */
932#endif /* (PNG_DEBUG > 1) */
933
934#endif /* _MSC_VER */
935#endif /* (PNG_DEBUG > 0) */
936#endif /* PNG_DEBUG */
937#ifndef png_debug
938#define png_debug(l, m)
939#endif
940#ifndef png_debug1
941#define png_debug1(l, m, p1)
942#endif
943#ifndef png_debug2
944#define png_debug2(l, m, p1, p2)
945#endif
946
947/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
948
949#ifdef __cplusplus
950}
951#endif
952
953#endif /* PNG_VERSION_INFO_ONLY */
954#endif /* PNGPRIV_H */
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