|
2296
|
1
|
|
|
2 /* pngstruct.h - header file for PNG reference library
|
|
|
3 *
|
|
|
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 1.6.1 [March 28, 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 /* The structure that holds the information to read and write PNG files.
|
|
|
16 * The only people who need to care about what is inside of this are the
|
|
|
17 * people who will be modifying the library for their own special needs.
|
|
|
18 * It should NOT be accessed directly by an application.
|
|
|
19 */
|
|
|
20
|
|
|
21 #ifndef PNGSTRUCT_H
|
|
|
22 #define PNGSTRUCT_H
|
|
|
23 /* zlib.h defines the structure z_stream, an instance of which is included
|
|
|
24 * in this structure and is required for decompressing the LZ compressed
|
|
|
25 * data in PNG files.
|
|
|
26 */
|
|
|
27 #ifndef ZLIB_CONST
|
|
|
28 /* We must ensure that zlib uses 'const' in declarations. */
|
|
|
29 # define ZLIB_CONST
|
|
|
30 #endif
|
|
|
31 #include "../../lib/zlib/zlib.h"
|
|
|
32 #ifdef const
|
|
|
33 /* zlib.h sometimes #defines const to nothing, undo this. */
|
|
|
34 # undef const
|
|
|
35 #endif
|
|
|
36
|
|
|
37 /* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility
|
|
|
38 * with older builds.
|
|
|
39 */
|
|
|
40 #if ZLIB_VERNUM < 0x1260
|
|
|
41 # define PNGZ_MSG_CAST(s) png_constcast(char*,s)
|
|
|
42 # define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b)
|
|
|
43 #else
|
|
|
44 # define PNGZ_MSG_CAST(s) (s)
|
|
|
45 # define PNGZ_INPUT_CAST(b) (b)
|
|
|
46 #endif
|
|
|
47
|
|
|
48 /* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib
|
|
|
49 * can handle at once. This type need be no larger than 16 bits (so maximum of
|
|
|
50 * 65535), this define allows us to discover how big it is, but limited by the
|
|
|
51 * maximuum for png_size_t. The value can be overriden in a library build
|
|
|
52 * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably
|
|
|
53 * lower value (e.g. 255 works). A lower value may help memory usage (slightly)
|
|
|
54 * and may even improve performance on some systems (and degrade it on others.)
|
|
|
55 */
|
|
|
56 #ifndef ZLIB_IO_MAX
|
|
|
57 # define ZLIB_IO_MAX ((uInt)-1)
|
|
|
58 #endif
|
|
|
59
|
|
|
60 #ifdef PNG_WRITE_SUPPORTED
|
|
|
61 /* The type of a compression buffer list used by the write code. */
|
|
|
62 typedef struct png_compression_buffer
|
|
|
63 {
|
|
|
64 struct png_compression_buffer *next;
|
|
|
65 png_byte output[1]; /* actually zbuf_size */
|
|
|
66 } png_compression_buffer, *png_compression_bufferp;
|
|
|
67
|
|
|
68 #define PNG_COMPRESSION_BUFFER_SIZE(pp)\
|
|
|
69 (offsetof(png_compression_buffer, output) + (pp)->zbuffer_size)
|
|
|
70 #endif
|
|
|
71
|
|
|
72 /* Colorspace support; structures used in png_struct, png_info and in internal
|
|
|
73 * functions to hold and communicate information about the color space.
|
|
|
74 *
|
|
|
75 * PNG_COLORSPACE_SUPPORTED is only required if the application will perform
|
|
|
76 * colorspace corrections, otherwise all the colorspace information can be
|
|
|
77 * skipped and the size of libpng can be reduced (significantly) by compiling
|
|
|
78 * out the colorspace support.
|
|
|
79 */
|
|
|
80 #ifdef PNG_COLORSPACE_SUPPORTED
|
|
|
81 /* The chromaticities of the red, green and blue colorants and the chromaticity
|
|
|
82 * of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)).
|
|
|
83 */
|
|
|
84 typedef struct png_xy
|
|
|
85 {
|
|
|
86 png_fixed_point redx, redy;
|
|
|
87 png_fixed_point greenx, greeny;
|
|
|
88 png_fixed_point bluex, bluey;
|
|
|
89 png_fixed_point whitex, whitey;
|
|
|
90 } png_xy;
|
|
|
91
|
|
|
92 /* The same data as above but encoded as CIE XYZ values. When this data comes
|
|
|
93 * from chromaticities the sum of the Y values is assumed to be 1.0
|
|
|
94 */
|
|
|
95 typedef struct png_XYZ
|
|
|
96 {
|
|
|
97 png_fixed_point red_X, red_Y, red_Z;
|
|
|
98 png_fixed_point green_X, green_Y, green_Z;
|
|
|
99 png_fixed_point blue_X, blue_Y, blue_Z;
|
|
|
100 } png_XYZ;
|
|
|
101 #endif /* COLORSPACE */
|
|
|
102
|
|
|
103 #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
|
|
|
104 /* A colorspace is all the above plus, potentially, profile information,
|
|
|
105 * however at present libpng does not use the profile internally so it is only
|
|
|
106 * stored in the png_info struct (if iCCP is supported.) The rendering intent
|
|
|
107 * is retained here and is checked.
|
|
|
108 *
|
|
|
109 * The file gamma encoding information is also stored here and gamma correction
|
|
|
110 * is done by libpng, whereas color correction must currently be done by the
|
|
|
111 * application.
|
|
|
112 */
|
|
|
113 typedef struct png_colorspace
|
|
|
114 {
|
|
|
115 #ifdef PNG_GAMMA_SUPPORTED
|
|
|
116 png_fixed_point gamma; /* File gamma */
|
|
|
117 #endif
|
|
|
118
|
|
|
119 #ifdef PNG_COLORSPACE_SUPPORTED
|
|
|
120 png_xy end_points_xy; /* End points as chromaticities */
|
|
|
121 png_XYZ end_points_XYZ; /* End points as CIE XYZ colorant values */
|
|
|
122 png_uint_16 rendering_intent; /* Rendering intent of a profile */
|
|
|
123 #endif
|
|
|
124
|
|
|
125 /* Flags are always defined to simplify the code. */
|
|
|
126 png_uint_16 flags; /* As defined below */
|
|
|
127 } png_colorspace, * PNG_RESTRICT png_colorspacerp;
|
|
|
128
|
|
|
129 typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp;
|
|
|
130
|
|
|
131 /* General flags for the 'flags' field */
|
|
|
132 #define PNG_COLORSPACE_HAVE_GAMMA 0x0001
|
|
|
133 #define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002
|
|
|
134 #define PNG_COLORSPACE_HAVE_INTENT 0x0004
|
|
|
135 #define PNG_COLORSPACE_FROM_gAMA 0x0008
|
|
|
136 #define PNG_COLORSPACE_FROM_cHRM 0x0010
|
|
|
137 #define PNG_COLORSPACE_FROM_sRGB 0x0020
|
|
|
138 #define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040
|
|
|
139 #define PNG_COLORSPACE_MATCHES_sRGB 0x0080 /* exact match on profile */
|
|
|
140 #define PNG_COLORSPACE_INVALID 0x8000
|
|
|
141 #define PNG_COLORSPACE_CANCEL(flags) (0xffff ^ (flags))
|
|
|
142 #endif /* COLORSPACE || GAMMA */
|
|
|
143
|
|
|
144 struct png_struct_def
|
|
|
145 {
|
|
|
146 #ifdef PNG_SETJMP_SUPPORTED
|
|
|
147 jmp_buf jmp_buf_local; /* New name in 1.6.0 for jmp_buf in png_struct */
|
|
|
148 png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */
|
|
|
149 jmp_buf *jmp_buf_ptr; /* passed to longjmp_fn */
|
|
|
150 size_t jmp_buf_size; /* size of the above, if allocated */
|
|
|
151 #endif
|
|
|
152 png_error_ptr error_fn; /* function for printing errors and aborting */
|
|
|
153 #ifdef PNG_WARNINGS_SUPPORTED
|
|
|
154 png_error_ptr warning_fn; /* function for printing warnings */
|
|
|
155 #endif
|
|
|
156 png_voidp error_ptr; /* user supplied struct for error functions */
|
|
|
157 png_rw_ptr write_data_fn; /* function for writing output data */
|
|
|
158 png_rw_ptr read_data_fn; /* function for reading input data */
|
|
|
159 png_voidp io_ptr; /* ptr to application struct for I/O functions */
|
|
|
160
|
|
|
161 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
|
|
|
162 png_user_transform_ptr read_user_transform_fn; /* user read transform */
|
|
|
163 #endif
|
|
|
164
|
|
|
165 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
|
|
|
166 png_user_transform_ptr write_user_transform_fn; /* user write transform */
|
|
|
167 #endif
|
|
|
168
|
|
|
169 /* These were added in libpng-1.0.2 */
|
|
|
170 #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
|
|
|
171 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|
|
172 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
|
|
|
173 png_voidp user_transform_ptr; /* user supplied struct for user transform */
|
|
|
174 png_byte user_transform_depth; /* bit depth of user transformed pixels */
|
|
|
175 png_byte user_transform_channels; /* channels in user transformed pixels */
|
|
|
176 #endif
|
|
|
177 #endif
|
|
|
178
|
|
|
179 png_uint_32 mode; /* tells us where we are in the PNG file */
|
|
|
180 png_uint_32 flags; /* flags indicating various things to libpng */
|
|
|
181 png_uint_32 transformations; /* which transformations to perform */
|
|
|
182
|
|
|
183 png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */
|
|
|
184 z_stream zstream; /* decompression structure */
|
|
|
185
|
|
|
186 #ifdef PNG_WRITE_SUPPORTED
|
|
|
187 png_compression_bufferp zbuffer_list; /* Created on demand during write */
|
|
|
188 uInt zbuffer_size; /* size of the actual buffer */
|
|
|
189
|
|
|
190 int zlib_level; /* holds zlib compression level */
|
|
|
191 int zlib_method; /* holds zlib compression method */
|
|
|
192 int zlib_window_bits; /* holds zlib compression window bits */
|
|
|
193 int zlib_mem_level; /* holds zlib compression memory level */
|
|
|
194 int zlib_strategy; /* holds zlib compression strategy */
|
|
|
195 #endif
|
|
|
196 /* Added at libpng 1.5.4 */
|
|
|
197 #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
|
|
|
198 int zlib_text_level; /* holds zlib compression level */
|
|
|
199 int zlib_text_method; /* holds zlib compression method */
|
|
|
200 int zlib_text_window_bits; /* holds zlib compression window bits */
|
|
|
201 int zlib_text_mem_level; /* holds zlib compression memory level */
|
|
|
202 int zlib_text_strategy; /* holds zlib compression strategy */
|
|
|
203 #endif
|
|
|
204 /* End of material added at libpng 1.5.4 */
|
|
|
205 /* Added at libpng 1.6.0 */
|
|
|
206 #ifdef PNG_WRITE_SUPPORTED
|
|
|
207 int zlib_set_level; /* Actual values set into the zstream on write */
|
|
|
208 int zlib_set_method;
|
|
|
209 int zlib_set_window_bits;
|
|
|
210 int zlib_set_mem_level;
|
|
|
211 int zlib_set_strategy;
|
|
|
212 #endif
|
|
|
213
|
|
|
214 png_uint_32 width; /* width of image in pixels */
|
|
|
215 png_uint_32 height; /* height of image in pixels */
|
|
|
216 png_uint_32 num_rows; /* number of rows in current pass */
|
|
|
217 png_uint_32 usr_width; /* width of row at start of write */
|
|
|
218 png_size_t rowbytes; /* size of row in bytes */
|
|
|
219 png_uint_32 iwidth; /* width of current interlaced row in pixels */
|
|
|
220 png_uint_32 row_number; /* current row in interlace pass */
|
|
|
221 png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */
|
|
|
222 png_bytep prev_row; /* buffer to save previous (unfiltered) row.
|
|
|
223 * This is a pointer into big_prev_row
|
|
|
224 */
|
|
|
225 png_bytep row_buf; /* buffer to save current (unfiltered) row.
|
|
|
226 * This is a pointer into big_row_buf
|
|
|
227 */
|
|
|
228 #ifdef PNG_WRITE_SUPPORTED
|
|
|
229 png_bytep sub_row; /* buffer to save "sub" row when filtering */
|
|
|
230 png_bytep up_row; /* buffer to save "up" row when filtering */
|
|
|
231 png_bytep avg_row; /* buffer to save "avg" row when filtering */
|
|
|
232 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
|
|
|
233 #endif
|
|
|
234 png_size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */
|
|
|
235
|
|
|
236 png_uint_32 idat_size; /* current IDAT size for read */
|
|
|
237 png_uint_32 crc; /* current chunk CRC value */
|
|
|
238 png_colorp palette; /* palette from the input file */
|
|
|
239 png_uint_16 num_palette; /* number of color entries in palette */
|
|
|
240
|
|
|
241 /* Added at libpng-1.5.10 */
|
|
|
242 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
|
|
|
243 int num_palette_max; /* maximum palette index found in IDAT */
|
|
|
244 #endif
|
|
|
245
|
|
|
246 png_uint_16 num_trans; /* number of transparency values */
|
|
|
247 png_byte compression; /* file compression type (always 0) */
|
|
|
248 png_byte filter; /* file filter type (always 0) */
|
|
|
249 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
|
|
|
250 png_byte pass; /* current interlace pass (0 - 6) */
|
|
|
251 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
|
|
|
252 png_byte color_type; /* color type of file */
|
|
|
253 png_byte bit_depth; /* bit depth of file */
|
|
|
254 png_byte usr_bit_depth; /* bit depth of users row: write only */
|
|
|
255 png_byte pixel_depth; /* number of bits per pixel */
|
|
|
256 png_byte channels; /* number of channels in file */
|
|
|
257 #ifdef PNG_WRITE_SUPPORTED
|
|
|
258 png_byte usr_channels; /* channels at start of write: write only */
|
|
|
259 #endif
|
|
|
260 png_byte sig_bytes; /* magic bytes read/written from start of file */
|
|
|
261 png_byte maximum_pixel_depth;
|
|
|
262 /* pixel depth used for the row buffers */
|
|
|
263 png_byte transformed_pixel_depth;
|
|
|
264 /* pixel depth after read/write transforms */
|
|
|
265 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
|
|
|
266 png_uint_16 filler; /* filler bytes for pixel expansion */
|
|
|
267 #endif
|
|
|
268
|
|
|
269 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
|
|
|
270 defined(PNG_READ_ALPHA_MODE_SUPPORTED)
|
|
|
271 png_byte background_gamma_type;
|
|
|
272 png_fixed_point background_gamma;
|
|
|
273 png_color_16 background; /* background color in screen gamma space */
|
|
|
274 #ifdef PNG_READ_GAMMA_SUPPORTED
|
|
|
275 png_color_16 background_1; /* background normalized to gamma 1.0 */
|
|
|
276 #endif
|
|
|
277 #endif /* PNG_bKGD_SUPPORTED */
|
|
|
278
|
|
|
279 #ifdef PNG_WRITE_FLUSH_SUPPORTED
|
|
|
280 png_flush_ptr output_flush_fn; /* Function for flushing output */
|
|
|
281 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
|
|
|
282 png_uint_32 flush_rows; /* number of rows written since last flush */
|
|
|
283 #endif
|
|
|
284
|
|
|
285 #ifdef PNG_READ_GAMMA_SUPPORTED
|
|
|
286 int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */
|
|
|
287 png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */
|
|
|
288
|
|
|
289 png_bytep gamma_table; /* gamma table for 8-bit depth files */
|
|
|
290 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
|
|
|
291 #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
|
|
|
292 defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
|
|
|
293 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|
|
294 png_bytep gamma_from_1; /* converts from 1.0 to screen */
|
|
|
295 png_bytep gamma_to_1; /* converts from file to 1.0 */
|
|
|
296 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
|
|
|
297 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
|
|
|
298 #endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
|
|
|
299 #endif
|
|
|
300
|
|
|
301 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
|
|
|
302 png_color_8 sig_bit; /* significant bits in each available channel */
|
|
|
303 #endif
|
|
|
304
|
|
|
305 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
|
|
|
306 png_color_8 shift; /* shift for significant bit tranformation */
|
|
|
307 #endif
|
|
|
308
|
|
|
309 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
|
|
|
310 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
311 png_bytep trans_alpha; /* alpha values for paletted files */
|
|
|
312 png_color_16 trans_color; /* transparent color for non-paletted files */
|
|
|
313 #endif
|
|
|
314
|
|
|
315 png_read_status_ptr read_row_fn; /* called after each row is decoded */
|
|
|
316 png_write_status_ptr write_row_fn; /* called after each row is encoded */
|
|
|
317 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
|
318 png_progressive_info_ptr info_fn; /* called after header data fully read */
|
|
|
319 png_progressive_row_ptr row_fn; /* called after a prog. row is decoded */
|
|
|
320 png_progressive_end_ptr end_fn; /* called after image is complete */
|
|
|
321 png_bytep save_buffer_ptr; /* current location in save_buffer */
|
|
|
322 png_bytep save_buffer; /* buffer for previously read data */
|
|
|
323 png_bytep current_buffer_ptr; /* current location in current_buffer */
|
|
|
324 png_bytep current_buffer; /* buffer for recently used data */
|
|
|
325 png_uint_32 push_length; /* size of current input chunk */
|
|
|
326 png_uint_32 skip_length; /* bytes to skip in input data */
|
|
|
327 png_size_t save_buffer_size; /* amount of data now in save_buffer */
|
|
|
328 png_size_t save_buffer_max; /* total size of save_buffer */
|
|
|
329 png_size_t buffer_size; /* total amount of available input data */
|
|
|
330 png_size_t current_buffer_size; /* amount of data now in current_buffer */
|
|
|
331 int process_mode; /* what push library is currently doing */
|
|
|
332 int cur_palette; /* current push library palette index */
|
|
|
333
|
|
|
334 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|
|
335
|
|
|
336 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
|
|
|
337 /* For the Borland special 64K segment handler */
|
|
|
338 png_bytepp offset_table_ptr;
|
|
|
339 png_bytep offset_table;
|
|
|
340 png_uint_16 offset_table_number;
|
|
|
341 png_uint_16 offset_table_count;
|
|
|
342 png_uint_16 offset_table_count_free;
|
|
|
343 #endif
|
|
|
344
|
|
|
345 #ifdef PNG_READ_QUANTIZE_SUPPORTED
|
|
|
346 png_bytep palette_lookup; /* lookup table for quantizing */
|
|
|
347 png_bytep quantize_index; /* index translation for palette files */
|
|
|
348 #endif
|
|
|
349
|
|
|
350 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
|
|
|
351 png_byte heuristic_method; /* heuristic for row filter selection */
|
|
|
352 png_byte num_prev_filters; /* number of weights for previous rows */
|
|
|
353 png_bytep prev_filters; /* filter type(s) of previous row(s) */
|
|
|
354 png_uint_16p filter_weights; /* weight(s) for previous line(s) */
|
|
|
355 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
|
|
|
356 png_uint_16p filter_costs; /* relative filter calculation cost */
|
|
|
357 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
|
|
|
358 #endif
|
|
|
359
|
|
|
360 /* Options */
|
|
|
361 #ifdef PNG_SET_OPTION_SUPPORTED
|
|
|
362 png_byte options; /* On/off state (up to 4 options) */
|
|
|
363 #endif
|
|
|
364
|
|
|
365 #if PNG_LIBPNG_VER < 10700
|
|
|
366 /* To do: remove this from libpng-1.7 */
|
|
|
367 #ifdef PNG_TIME_RFC1123_SUPPORTED
|
|
|
368 char time_buffer[29]; /* String to hold RFC 1123 time text */
|
|
|
369 #endif
|
|
|
370 #endif
|
|
|
371
|
|
|
372 /* New members added in libpng-1.0.6 */
|
|
|
373
|
|
|
374 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
|
|
|
375
|
|
|
376 #ifdef PNG_USER_CHUNKS_SUPPORTED
|
|
|
377 png_voidp user_chunk_ptr;
|
|
|
378 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
|
|
|
379 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
|
|
|
380 #endif
|
|
|
381 #endif
|
|
|
382
|
|
|
383 #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
|
|
|
384 int unknown_default; /* As PNG_HANDLE_* */
|
|
|
385 unsigned int num_chunk_list; /* Number of entries in the list */
|
|
|
386 png_bytep chunk_list; /* List of png_byte[5]; the textual chunk name
|
|
|
387 * followed by a PNG_HANDLE_* byte */
|
|
|
388 #endif
|
|
|
389
|
|
|
390 /* New members added in libpng-1.0.3 */
|
|
|
391 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
|
|
|
392 png_byte rgb_to_gray_status;
|
|
|
393 /* Added in libpng 1.5.5 to record setting of coefficients: */
|
|
|
394 png_byte rgb_to_gray_coefficients_set;
|
|
|
395 /* These were changed from png_byte in libpng-1.0.6 */
|
|
|
396 png_uint_16 rgb_to_gray_red_coeff;
|
|
|
397 png_uint_16 rgb_to_gray_green_coeff;
|
|
|
398 /* deleted in 1.5.5: rgb_to_gray_blue_coeff; */
|
|
|
399 #endif
|
|
|
400
|
|
|
401 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
|
|
|
402 #if defined(PNG_MNG_FEATURES_SUPPORTED)
|
|
|
403 /* Changed from png_byte to png_uint_32 at version 1.2.0 */
|
|
|
404 png_uint_32 mng_features_permitted;
|
|
|
405 #endif
|
|
|
406
|
|
|
407 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
|
|
|
408 #ifdef PNG_MNG_FEATURES_SUPPORTED
|
|
|
409 png_byte filter_type;
|
|
|
410 #endif
|
|
|
411
|
|
|
412 /* New members added in libpng-1.2.0 */
|
|
|
413
|
|
|
414 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
|
|
|
415 #ifdef PNG_USER_MEM_SUPPORTED
|
|
|
416 png_voidp mem_ptr; /* user supplied struct for mem functions */
|
|
|
417 png_malloc_ptr malloc_fn; /* function for allocating memory */
|
|
|
418 png_free_ptr free_fn; /* function for freeing memory */
|
|
|
419 #endif
|
|
|
420
|
|
|
421 /* New member added in libpng-1.0.13 and 1.2.0 */
|
|
|
422 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
|
|
|
423
|
|
|
424 #ifdef PNG_READ_QUANTIZE_SUPPORTED
|
|
|
425 /* The following three members were added at version 1.0.14 and 1.2.4 */
|
|
|
426 png_bytep quantize_sort; /* working sort array */
|
|
|
427 png_bytep index_to_palette; /* where the original index currently is
|
|
|
428 in the palette */
|
|
|
429 png_bytep palette_to_index; /* which original index points to this
|
|
|
430 palette color */
|
|
|
431 #endif
|
|
|
432
|
|
|
433 /* New members added in libpng-1.0.16 and 1.2.6 */
|
|
|
434 png_byte compression_type;
|
|
|
435
|
|
|
436 #ifdef PNG_USER_LIMITS_SUPPORTED
|
|
|
437 png_uint_32 user_width_max;
|
|
|
438 png_uint_32 user_height_max;
|
|
|
439
|
|
|
440 /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
|
|
|
441 * chunks that can be stored (0 means unlimited).
|
|
|
442 */
|
|
|
443 png_uint_32 user_chunk_cache_max;
|
|
|
444
|
|
|
445 /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk
|
|
|
446 * can occupy when decompressed. 0 means unlimited.
|
|
|
447 */
|
|
|
448 png_alloc_size_t user_chunk_malloc_max;
|
|
|
449 #endif
|
|
|
450
|
|
|
451 /* New member added in libpng-1.0.25 and 1.2.17 */
|
|
|
452 #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
|
|
|
453 /* Temporary storage for unknown chunk that the library doesn't recognize,
|
|
|
454 * used while reading the chunk.
|
|
|
455 */
|
|
|
456 png_unknown_chunk unknown_chunk;
|
|
|
457 #endif
|
|
|
458
|
|
|
459 /* New member added in libpng-1.2.26 */
|
|
|
460 png_size_t old_big_row_buf_size;
|
|
|
461
|
|
|
462 #ifdef PNG_READ_SUPPORTED
|
|
|
463 /* New member added in libpng-1.2.30 */
|
|
|
464 png_bytep read_buffer; /* buffer for reading chunk data */
|
|
|
465 png_alloc_size_t read_buffer_size; /* current size of the buffer */
|
|
|
466 #endif
|
|
|
467 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|
|
468 uInt IDAT_read_size; /* limit on read buffer size for IDAT */
|
|
|
469 #endif
|
|
|
470
|
|
|
471 #ifdef PNG_IO_STATE_SUPPORTED
|
|
|
472 /* New member added in libpng-1.4.0 */
|
|
|
473 png_uint_32 io_state;
|
|
|
474 #endif
|
|
|
475
|
|
|
476 /* New member added in libpng-1.5.6 */
|
|
|
477 png_bytep big_prev_row;
|
|
|
478
|
|
|
479 /* New member added in libpng-1.5.7 */
|
|
|
480 void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info,
|
|
|
481 png_bytep row, png_const_bytep prev_row);
|
|
|
482
|
|
|
483 #ifdef PNG_READ_SUPPORTED
|
|
|
484 #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
|
|
|
485 png_colorspace colorspace;
|
|
|
486 #endif
|
|
|
487 #endif
|
|
|
488 };
|
|
|
489 #endif /* PNGSTRUCT_H */
|
