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/src/FreeImage/Source/LibPNG/pngstruct.h

https://bitbucket.org/cabalistic/ogredeps/
C++ Header | 358 lines | 242 code | 52 blank | 64 comment | 14 complexity | a164b0901061bd0da48fd7c1da1e24bf MD5 | raw file
  1
  2/* pngstruct.h - header file for PNG reference library
  3 *
  4 * Copyright (c) 1998-2011 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 1.5.9 [February 18, 2012]
  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#include "zlib.h"
 28
 29struct png_struct_def
 30{
 31#ifdef PNG_SETJMP_SUPPORTED
 32   jmp_buf longjmp_buffer;    /* used in png_error */
 33   png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */
 34#endif
 35   png_error_ptr error_fn;    /* function for printing errors and aborting */
 36#ifdef PNG_WARNINGS_SUPPORTED
 37   png_error_ptr warning_fn;  /* function for printing warnings */
 38#endif
 39   png_voidp error_ptr;       /* user supplied struct for error functions */
 40   png_rw_ptr write_data_fn;  /* function for writing output data */
 41   png_rw_ptr read_data_fn;   /* function for reading input data */
 42   png_voidp io_ptr;          /* ptr to application struct for I/O functions */
 43
 44#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
 45   png_user_transform_ptr read_user_transform_fn; /* user read transform */
 46#endif
 47
 48#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
 49   png_user_transform_ptr write_user_transform_fn; /* user write transform */
 50#endif
 51
 52/* These were added in libpng-1.0.2 */
 53#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
 54#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
 55    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
 56   png_voidp user_transform_ptr; /* user supplied struct for user transform */
 57   png_byte user_transform_depth;    /* bit depth of user transformed pixels */
 58   png_byte user_transform_channels; /* channels in user transformed pixels */
 59#endif
 60#endif
 61
 62   png_uint_32 mode;          /* tells us where we are in the PNG file */
 63   png_uint_32 flags;         /* flags indicating various things to libpng */
 64   png_uint_32 transformations; /* which transformations to perform */
 65
 66   z_stream zstream;          /* pointer to decompression structure (below) */
 67   png_bytep zbuf;            /* buffer for zlib */
 68   uInt zbuf_size;            /* size of zbuf (typically 65536) */
 69#ifdef PNG_WRITE_SUPPORTED
 70
 71/* Added in 1.5.4: state to keep track of whether the zstream has been
 72 * initialized and if so whether it is for IDAT or some other chunk.
 73 */
 74#define PNG_ZLIB_UNINITIALIZED 0
 75#define PNG_ZLIB_FOR_IDAT      1
 76#define PNG_ZLIB_FOR_TEXT      2 /* anything other than IDAT */
 77#define PNG_ZLIB_USE_MASK      3 /* bottom two bits */
 78#define PNG_ZLIB_IN_USE        4 /* a flag value */
 79
 80   png_uint_32 zlib_state;       /* State of zlib initialization */
 81/* End of material added at libpng 1.5.4 */
 82
 83   int zlib_level;            /* holds zlib compression level */
 84   int zlib_method;           /* holds zlib compression method */
 85   int zlib_window_bits;      /* holds zlib compression window bits */
 86   int zlib_mem_level;        /* holds zlib compression memory level */
 87   int zlib_strategy;         /* holds zlib compression strategy */
 88#endif
 89/* Added at libpng 1.5.4 */
 90#if defined(PNG_WRITE_COMPRESSED_TEXT_SUPPORTED) || \
 91    defined(PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED)
 92   int zlib_text_level;            /* holds zlib compression level */
 93   int zlib_text_method;           /* holds zlib compression method */
 94   int zlib_text_window_bits;      /* holds zlib compression window bits */
 95   int zlib_text_mem_level;        /* holds zlib compression memory level */
 96   int zlib_text_strategy;         /* holds zlib compression strategy */
 97#endif
 98/* End of material added at libpng 1.5.4 */
 99
100   png_uint_32 width;         /* width of image in pixels */
101   png_uint_32 height;        /* height of image in pixels */
102   png_uint_32 num_rows;      /* number of rows in current pass */
103   png_uint_32 usr_width;     /* width of row at start of write */
104   png_size_t rowbytes;       /* size of row in bytes */
105   png_uint_32 iwidth;        /* width of current interlaced row in pixels */
106   png_uint_32 row_number;    /* current row in interlace pass */
107   png_uint_32 chunk_name;    /* PNG_CHUNK() id of current chunk */
108   png_bytep prev_row;        /* buffer to save previous (unfiltered) row.
109                               * This is a pointer into big_prev_row
110                               */
111   png_bytep row_buf;         /* buffer to save current (unfiltered) row.
112                               * This is a pointer into big_row_buf
113                               */
114   png_bytep sub_row;         /* buffer to save "sub" row when filtering */
115   png_bytep up_row;          /* buffer to save "up" row when filtering */
116   png_bytep avg_row;         /* buffer to save "avg" row when filtering */
117   png_bytep paeth_row;       /* buffer to save "Paeth" row when filtering */
118   png_size_t info_rowbytes;  /* Added in 1.5.4: cache of updated row bytes */
119
120   png_uint_32 idat_size;     /* current IDAT size for read */
121   png_uint_32 crc;           /* current chunk CRC value */
122   png_colorp palette;        /* palette from the input file */
123   png_uint_16 num_palette;   /* number of color entries in palette */
124   png_uint_16 num_trans;     /* number of transparency values */
125   png_byte compression;      /* file compression type (always 0) */
126   png_byte filter;           /* file filter type (always 0) */
127   png_byte interlaced;       /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
128   png_byte pass;             /* current interlace pass (0 - 6) */
129   png_byte do_filter;        /* row filter flags (see PNG_FILTER_ below ) */
130   png_byte color_type;       /* color type of file */
131   png_byte bit_depth;        /* bit depth of file */
132   png_byte usr_bit_depth;    /* bit depth of users row: write only */
133   png_byte pixel_depth;      /* number of bits per pixel */
134   png_byte channels;         /* number of channels in file */
135   png_byte usr_channels;     /* channels at start of write: write only */
136   png_byte sig_bytes;        /* magic bytes read/written from start of file */
137   png_byte maximum_pixel_depth;
138                              /* pixel depth used for the row buffers */
139   png_byte transformed_pixel_depth;
140                              /* pixel depth after read/write transforms */
141   png_byte io_chunk_string[5];
142                              /* string name of chunk */
143
144#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
145   png_uint_16 filler;           /* filler bytes for pixel expansion */
146#endif
147
148#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
149   defined(PNG_READ_ALPHA_MODE_SUPPORTED)
150   png_byte background_gamma_type;
151   png_fixed_point background_gamma;
152   png_color_16 background;   /* background color in screen gamma space */
153#ifdef PNG_READ_GAMMA_SUPPORTED
154   png_color_16 background_1; /* background normalized to gamma 1.0 */
155#endif
156#endif /* PNG_bKGD_SUPPORTED */
157
158#ifdef PNG_WRITE_FLUSH_SUPPORTED
159   png_flush_ptr output_flush_fn; /* Function for flushing output */
160   png_uint_32 flush_dist;    /* how many rows apart to flush, 0 - no flush */
161   png_uint_32 flush_rows;    /* number of rows written since last flush */
162#endif
163
164#ifdef PNG_READ_GAMMA_SUPPORTED
165   int gamma_shift;      /* number of "insignificant" bits in 16-bit gamma */
166   png_fixed_point gamma;        /* file gamma value */
167   png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */
168
169   png_bytep gamma_table;     /* gamma table for 8-bit depth files */
170   png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
171#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
172   defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
173   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
174   png_bytep gamma_from_1;    /* converts from 1.0 to screen */
175   png_bytep gamma_to_1;      /* converts from file to 1.0 */
176   png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
177   png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
178#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
179#endif
180
181#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
182   png_color_8 sig_bit;       /* significant bits in each available channel */
183#endif
184
185#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
186   png_color_8 shift;         /* shift for significant bit tranformation */
187#endif
188
189#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
190 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
191   png_bytep trans_alpha;           /* alpha values for paletted files */
192   png_color_16 trans_color;  /* transparent color for non-paletted files */
193#endif
194
195   png_read_status_ptr read_row_fn;   /* called after each row is decoded */
196   png_write_status_ptr write_row_fn; /* called after each row is encoded */
197#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
198   png_progressive_info_ptr info_fn; /* called after header data fully read */
199   png_progressive_row_ptr row_fn;   /* called after a prog. row is decoded */
200   png_progressive_end_ptr end_fn;   /* called after image is complete */
201   png_bytep save_buffer_ptr;        /* current location in save_buffer */
202   png_bytep save_buffer;            /* buffer for previously read data */
203   png_bytep current_buffer_ptr;     /* current location in current_buffer */
204   png_bytep current_buffer;         /* buffer for recently used data */
205   png_uint_32 push_length;          /* size of current input chunk */
206   png_uint_32 skip_length;          /* bytes to skip in input data */
207   png_size_t save_buffer_size;      /* amount of data now in save_buffer */
208   png_size_t save_buffer_max;       /* total size of save_buffer */
209   png_size_t buffer_size;           /* total amount of available input data */
210   png_size_t current_buffer_size;   /* amount of data now in current_buffer */
211   int process_mode;                 /* what push library is currently doing */
212   int cur_palette;                  /* current push library palette index */
213
214#  ifdef PNG_TEXT_SUPPORTED
215     png_size_t current_text_size;   /* current size of text input data */
216     png_size_t current_text_left;   /* how much text left to read in input */
217     png_charp current_text;         /* current text chunk buffer */
218     png_charp current_text_ptr;     /* current location in current_text */
219#  endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */
220
221#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
222
223#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
224/* For the Borland special 64K segment handler */
225   png_bytepp offset_table_ptr;
226   png_bytep offset_table;
227   png_uint_16 offset_table_number;
228   png_uint_16 offset_table_count;
229   png_uint_16 offset_table_count_free;
230#endif
231
232#ifdef PNG_READ_QUANTIZE_SUPPORTED
233   png_bytep palette_lookup; /* lookup table for quantizing */
234   png_bytep quantize_index; /* index translation for palette files */
235#endif
236
237#if defined(PNG_READ_QUANTIZE_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
238   png_uint_16p hist;                /* histogram */
239#endif
240
241#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
242   png_byte heuristic_method;        /* heuristic for row filter selection */
243   png_byte num_prev_filters;        /* number of weights for previous rows */
244   png_bytep prev_filters;           /* filter type(s) of previous row(s) */
245   png_uint_16p filter_weights;      /* weight(s) for previous line(s) */
246   png_uint_16p inv_filter_weights;  /* 1/weight(s) for previous line(s) */
247   png_uint_16p filter_costs;        /* relative filter calculation cost */
248   png_uint_16p inv_filter_costs;    /* 1/relative filter calculation cost */
249#endif
250
251#ifdef PNG_TIME_RFC1123_SUPPORTED
252   char time_buffer[29]; /* String to hold RFC 1123 time text */
253#endif
254
255/* New members added in libpng-1.0.6 */
256
257   png_uint_32 free_me;    /* flags items libpng is responsible for freeing */
258
259#ifdef PNG_USER_CHUNKS_SUPPORTED
260   png_voidp user_chunk_ptr;
261   png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
262#endif
263
264#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
265   int num_chunk_list;
266   png_bytep chunk_list;
267#endif
268
269#ifdef PNG_READ_sRGB_SUPPORTED
270   /* Added in 1.5.5 to record an sRGB chunk in the png. */
271   png_byte is_sRGB;
272#endif
273
274/* New members added in libpng-1.0.3 */
275#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
276   png_byte rgb_to_gray_status;
277   /* Added in libpng 1.5.5 to record setting of coefficients: */
278   png_byte rgb_to_gray_coefficients_set;
279   /* These were changed from png_byte in libpng-1.0.6 */
280   png_uint_16 rgb_to_gray_red_coeff;
281   png_uint_16 rgb_to_gray_green_coeff;
282   /* deleted in 1.5.5: rgb_to_gray_blue_coeff; */
283#endif
284
285/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
286#if defined(PNG_MNG_FEATURES_SUPPORTED)
287/* Changed from png_byte to png_uint_32 at version 1.2.0 */
288   png_uint_32 mng_features_permitted;
289#endif
290
291/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
292#ifdef PNG_MNG_FEATURES_SUPPORTED
293   png_byte filter_type;
294#endif
295
296/* New members added in libpng-1.2.0 */
297
298/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
299#ifdef PNG_USER_MEM_SUPPORTED
300   png_voidp mem_ptr;             /* user supplied struct for mem functions */
301   png_malloc_ptr malloc_fn;      /* function for allocating memory */
302   png_free_ptr free_fn;          /* function for freeing memory */
303#endif
304
305/* New member added in libpng-1.0.13 and 1.2.0 */
306   png_bytep big_row_buf;         /* buffer to save current (unfiltered) row */
307
308#ifdef PNG_READ_QUANTIZE_SUPPORTED
309/* The following three members were added at version 1.0.14 and 1.2.4 */
310   png_bytep quantize_sort;          /* working sort array */
311   png_bytep index_to_palette;       /* where the original index currently is
312                                        in the palette */
313   png_bytep palette_to_index;       /* which original index points to this
314                                         palette color */
315#endif
316
317/* New members added in libpng-1.0.16 and 1.2.6 */
318   png_byte compression_type;
319
320#ifdef PNG_USER_LIMITS_SUPPORTED
321   png_uint_32 user_width_max;
322   png_uint_32 user_height_max;
323
324   /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
325    * chunks that can be stored (0 means unlimited).
326    */
327   png_uint_32 user_chunk_cache_max;
328
329   /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk
330    * can occupy when decompressed.  0 means unlimited.
331    */
332   png_alloc_size_t user_chunk_malloc_max;
333#endif
334
335/* New member added in libpng-1.0.25 and 1.2.17 */
336#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
337   /* Storage for unknown chunk that the library doesn't recognize. */
338   png_unknown_chunk unknown_chunk;
339#endif
340
341/* New member added in libpng-1.2.26 */
342  png_size_t old_big_row_buf_size;
343
344/* New member added in libpng-1.2.30 */
345  png_charp chunkdata;  /* buffer for reading chunk data */
346
347#ifdef PNG_IO_STATE_SUPPORTED
348/* New member added in libpng-1.4.0 */
349   png_uint_32 io_state;
350#endif
351
352/* New member added in libpng-1.5.6 */
353   png_bytep big_prev_row;
354
355   void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info,
356      png_bytep row, png_const_bytep prev_row);
357};
358#endif /* PNGSTRUCT_H */