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| 1 | /* pngstruct.h - header file for PNG reference library |
1 | /* pngstruct.h - header file for PNG reference library |
| 2 | * |
2 | * |
| 3 | * Copyright (c) 1998-2011 Glenn Randers-Pehrson |
3 | * Copyright (c) 1998-2013 Glenn Randers-Pehrson |
| 4 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
4 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 5 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
5 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
| 6 | * |
6 | * |
| 7 | * Last changed in libpng 1.5.0 [January 6, 2011] |
7 | * Last changed in libpng 1.6.1 [March 28, 2013] |
| 8 | * |
8 | * |
| 9 | * This code is released under the libpng license. |
9 | * This code is released under the libpng license. |
| 10 | * For conditions of distribution and use, see the disclaimer |
10 | * For conditions of distribution and use, see the disclaimer |
| 11 | * and license in png.h |
11 | * and license in png.h |
| 12 | */ |
12 | */ |
| Line 22... | Line 22... | ||
| 22 | /* zlib.h defines the structure z_stream, an instance of which is included |
22 | /* zlib.h defines the structure z_stream, an instance of which is included |
| 23 | * in this structure and is required for decompressing the LZ compressed |
23 | * in this structure and is required for decompressing the LZ compressed |
| 24 | * data in PNG files. |
24 | * data in PNG files. |
| 25 | */ |
25 | */ |
| 26 | #include "zlib.h" |
26 | #ifndef ZLIB_CONST |
| - | 27 | /* We must ensure that zlib uses 'const' in declarations. */ |
|
| - | 28 | # define ZLIB_CONST |
|
| - | 29 | #endif |
|
| - | 30 | #include "zlib.h" |
|
| 27 | 31 | #ifdef const |
|
| - | 32 | /* zlib.h sometimes #defines const to nothing, undo this. */ |
|
| - | 33 | # undef const |
|
| - | 34 | #endif |
|
| - | 35 | ||
| - | 36 | /* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility |
|
| - | 37 | * with older builds. |
|
| - | 38 | */ |
|
| - | 39 | #if ZLIB_VERNUM < 0x1260 |
|
| - | 40 | # define PNGZ_MSG_CAST(s) png_constcast(char*,s) |
|
| - | 41 | # define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b) |
|
| - | 42 | #else |
|
| - | 43 | # define PNGZ_MSG_CAST(s) (s) |
|
| - | 44 | # define PNGZ_INPUT_CAST(b) (b) |
|
| - | 45 | #endif |
|
| - | 46 | ||
| - | 47 | /* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib |
|
| - | 48 | * can handle at once. This type need be no larger than 16 bits (so maximum of |
|
| - | 49 | * 65535), this define allows us to discover how big it is, but limited by the |
|
| - | 50 | * maximuum for png_size_t. The value can be overriden in a library build |
|
| - | 51 | * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably |
|
| - | 52 | * lower value (e.g. 255 works). A lower value may help memory usage (slightly) |
|
| - | 53 | * and may even improve performance on some systems (and degrade it on others.) |
|
| - | 54 | */ |
|
| - | 55 | #ifndef ZLIB_IO_MAX |
|
| - | 56 | # define ZLIB_IO_MAX ((uInt)-1) |
|
| - | 57 | #endif |
|
| - | 58 | ||
| - | 59 | #ifdef PNG_WRITE_SUPPORTED |
|
| - | 60 | /* The type of a compression buffer list used by the write code. */ |
|
| - | 61 | typedef struct png_compression_buffer |
|
| - | 62 | { |
|
| - | 63 | struct png_compression_buffer *next; |
|
| - | 64 | png_byte output[1]; /* actually zbuf_size */ |
|
| - | 65 | } png_compression_buffer, *png_compression_bufferp; |
|
| - | 66 | ||
| - | 67 | #define PNG_COMPRESSION_BUFFER_SIZE(pp)\ |
|
| - | 68 | (offsetof(png_compression_buffer, output) + (pp)->zbuffer_size) |
|
| - | 69 | #endif |
|
| - | 70 | ||
| - | 71 | /* Colorspace support; structures used in png_struct, png_info and in internal |
|
| - | 72 | * functions to hold and communicate information about the color space. |
|
| - | 73 | * |
|
| - | 74 | * PNG_COLORSPACE_SUPPORTED is only required if the application will perform |
|
| - | 75 | * colorspace corrections, otherwise all the colorspace information can be |
|
| - | 76 | * skipped and the size of libpng can be reduced (significantly) by compiling |
|
| - | 77 | * out the colorspace support. |
|
| - | 78 | */ |
|
| - | 79 | #ifdef PNG_COLORSPACE_SUPPORTED |
|
| - | 80 | /* The chromaticities of the red, green and blue colorants and the chromaticity |
|
| - | 81 | * of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)). |
|
| - | 82 | */ |
|
| - | 83 | typedef struct png_xy |
|
| - | 84 | { |
|
| - | 85 | png_fixed_point redx, redy; |
|
| - | 86 | png_fixed_point greenx, greeny; |
|
| - | 87 | png_fixed_point bluex, bluey; |
|
| - | 88 | png_fixed_point whitex, whitey; |
|
| - | 89 | } png_xy; |
|
| - | 90 | ||
| - | 91 | /* The same data as above but encoded as CIE XYZ values. When this data comes |
|
| - | 92 | * from chromaticities the sum of the Y values is assumed to be 1.0 |
|
| - | 93 | */ |
|
| - | 94 | typedef struct png_XYZ |
|
| - | 95 | { |
|
| - | 96 | png_fixed_point red_X, red_Y, red_Z; |
|
| - | 97 | png_fixed_point green_X, green_Y, green_Z; |
|
| - | 98 | png_fixed_point blue_X, blue_Y, blue_Z; |
|
| - | 99 | } png_XYZ; |
|
| - | 100 | #endif /* COLORSPACE */ |
|
| - | 101 | ||
| - | 102 | #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED) |
|
| - | 103 | /* A colorspace is all the above plus, potentially, profile information, |
|
| - | 104 | * however at present libpng does not use the profile internally so it is only |
|
| - | 105 | * stored in the png_info struct (if iCCP is supported.) The rendering intent |
|
| - | 106 | * is retained here and is checked. |
|
| - | 107 | * |
|
| - | 108 | * The file gamma encoding information is also stored here and gamma correction |
|
| - | 109 | * is done by libpng, whereas color correction must currently be done by the |
|
| - | 110 | * application. |
|
| - | 111 | */ |
|
| - | 112 | typedef struct png_colorspace |
|
| - | 113 | { |
|
| - | 114 | #ifdef PNG_GAMMA_SUPPORTED |
|
| - | 115 | png_fixed_point gamma; /* File gamma */ |
|
| - | 116 | #endif |
|
| - | 117 | ||
| - | 118 | #ifdef PNG_COLORSPACE_SUPPORTED |
|
| - | 119 | png_xy end_points_xy; /* End points as chromaticities */ |
|
| - | 120 | png_XYZ end_points_XYZ; /* End points as CIE XYZ colorant values */ |
|
| - | 121 | png_uint_16 rendering_intent; /* Rendering intent of a profile */ |
|
| - | 122 | #endif |
|
| - | 123 | ||
| - | 124 | /* Flags are always defined to simplify the code. */ |
|
| - | 125 | png_uint_16 flags; /* As defined below */ |
|
| - | 126 | } png_colorspace, * PNG_RESTRICT png_colorspacerp; |
|
| - | 127 | ||
| - | 128 | typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp; |
|
| - | 129 | ||
| - | 130 | /* General flags for the 'flags' field */ |
|
| - | 131 | #define PNG_COLORSPACE_HAVE_GAMMA 0x0001 |
|
| - | 132 | #define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002 |
|
| - | 133 | #define PNG_COLORSPACE_HAVE_INTENT 0x0004 |
|
| - | 134 | #define PNG_COLORSPACE_FROM_gAMA 0x0008 |
|
| - | 135 | #define PNG_COLORSPACE_FROM_cHRM 0x0010 |
|
| - | 136 | #define PNG_COLORSPACE_FROM_sRGB 0x0020 |
|
| - | 137 | #define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040 |
|
| - | 138 | #define PNG_COLORSPACE_MATCHES_sRGB 0x0080 /* exact match on profile */ |
|
| - | 139 | #define PNG_COLORSPACE_INVALID 0x8000 |
|
| - | 140 | #define PNG_COLORSPACE_CANCEL(flags) (0xffff ^ (flags)) |
|
| - | 141 | #endif /* COLORSPACE || GAMMA */ |
|
| - | 142 | ||
| Line 28... | Line 143... | ||
| 28 | struct png_struct_def |
143 | struct png_struct_def |
| 29 | { |
144 | { |
| 30 | #ifdef PNG_SETJMP_SUPPORTED |
145 | #ifdef PNG_SETJMP_SUPPORTED |
| 31 | jmp_buf png_jmpbuf; /* used in png_error */ |
146 | jmp_buf jmp_buf_local; /* New name in 1.6.0 for jmp_buf in png_struct */ |
| 32 | png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */ |
147 | png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */ |
| - | 148 | jmp_buf *jmp_buf_ptr; /* passed to longjmp_fn */ |
|
| - | 149 | size_t jmp_buf_size; /* size of the above, if allocated */ |
|
| 33 | #endif |
150 | #endif |
| 34 | png_error_ptr error_fn; /* function for printing errors and aborting */ |
151 | png_error_ptr error_fn; /* function for printing errors and aborting */ |
| - | 152 | #ifdef PNG_WARNINGS_SUPPORTED |
|
| 35 | png_error_ptr warning_fn; /* function for printing warnings */ |
153 | png_error_ptr warning_fn; /* function for printing warnings */ |
| - | 154 | #endif |
|
| 36 | png_voidp error_ptr; /* user supplied struct for error functions */ |
155 | png_voidp error_ptr; /* user supplied struct for error functions */ |
| 37 | png_rw_ptr write_data_fn; /* function for writing output data */ |
156 | png_rw_ptr write_data_fn; /* function for writing output data */ |
| 38 | png_rw_ptr read_data_fn; /* function for reading input data */ |
157 | png_rw_ptr read_data_fn; /* function for reading input data */ |
| 39 | png_voidp io_ptr; /* ptr to application struct for I/O functions */ |
158 | png_voidp io_ptr; /* ptr to application struct for I/O functions */ |
| Line 59... | Line 178... | ||
| 59 | png_uint_32 mode; /* tells us where we are in the PNG file */ |
178 | png_uint_32 mode; /* tells us where we are in the PNG file */ |
| 60 | png_uint_32 flags; /* flags indicating various things to libpng */ |
179 | png_uint_32 flags; /* flags indicating various things to libpng */ |
| 61 | png_uint_32 transformations; /* which transformations to perform */ |
180 | png_uint_32 transformations; /* which transformations to perform */ |
| Line -... | Line 181... | ||
| - | 181 | ||
| 62 | 182 | png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */ |
|
| - | 183 | z_stream zstream; /* decompression structure */ |
|
| - | 184 | ||
| 63 | z_stream zstream; /* pointer to decompression structure (below) */ |
185 | #ifdef PNG_WRITE_SUPPORTED |
| 64 | png_bytep zbuf; /* buffer for zlib */ |
186 | png_compression_bufferp zbuffer_list; /* Created on demand during write */ |
| - | 187 | uInt zbuffer_size; /* size of the actual buffer */ |
|
| 65 | uInt zbuf_size; /* size of zbuf (typically 65536) */ |
188 | |
| 66 | int zlib_level; /* holds zlib compression level */ |
189 | int zlib_level; /* holds zlib compression level */ |
| 67 | int zlib_method; /* holds zlib compression method */ |
190 | int zlib_method; /* holds zlib compression method */ |
| 68 | int zlib_window_bits; /* holds zlib compression window bits */ |
191 | int zlib_window_bits; /* holds zlib compression window bits */ |
| 69 | int zlib_mem_level; /* holds zlib compression memory level */ |
192 | int zlib_mem_level; /* holds zlib compression memory level */ |
| - | 193 | int zlib_strategy; /* holds zlib compression strategy */ |
|
| - | 194 | #endif |
|
| - | 195 | /* Added at libpng 1.5.4 */ |
|
| - | 196 | #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED |
|
| - | 197 | int zlib_text_level; /* holds zlib compression level */ |
|
| - | 198 | int zlib_text_method; /* holds zlib compression method */ |
|
| - | 199 | int zlib_text_window_bits; /* holds zlib compression window bits */ |
|
| - | 200 | int zlib_text_mem_level; /* holds zlib compression memory level */ |
|
| - | 201 | int zlib_text_strategy; /* holds zlib compression strategy */ |
|
| - | 202 | #endif |
|
| - | 203 | /* End of material added at libpng 1.5.4 */ |
|
| - | 204 | /* Added at libpng 1.6.0 */ |
|
| - | 205 | #ifdef PNG_WRITE_SUPPORTED |
|
| - | 206 | int zlib_set_level; /* Actual values set into the zstream on write */ |
|
| - | 207 | int zlib_set_method; |
|
| - | 208 | int zlib_set_window_bits; |
|
| - | 209 | int zlib_set_mem_level; |
|
| - | 210 | int zlib_set_strategy; |
|
| Line 70... | Line 211... | ||
| 70 | int zlib_strategy; /* holds zlib compression strategy */ |
211 | #endif |
| 71 | 212 | ||
| 72 | png_uint_32 width; /* width of image in pixels */ |
213 | png_uint_32 width; /* width of image in pixels */ |
| 73 | png_uint_32 height; /* height of image in pixels */ |
214 | png_uint_32 height; /* height of image in pixels */ |
| 74 | png_uint_32 num_rows; /* number of rows in current pass */ |
215 | png_uint_32 num_rows; /* number of rows in current pass */ |
| 75 | png_uint_32 usr_width; /* width of row at start of write */ |
216 | png_uint_32 usr_width; /* width of row at start of write */ |
| 76 | png_size_t rowbytes; /* size of row in bytes */ |
217 | png_size_t rowbytes; /* size of row in bytes */ |
| - | 218 | png_uint_32 iwidth; /* width of current interlaced row in pixels */ |
|
| 77 | png_uint_32 iwidth; /* width of current interlaced row in pixels */ |
219 | png_uint_32 row_number; /* current row in interlace pass */ |
| - | 220 | png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */ |
|
| - | 221 | png_bytep prev_row; /* buffer to save previous (unfiltered) row. |
|
| 78 | png_uint_32 row_number; /* current row in interlace pass */ |
222 | * This is a pointer into big_prev_row |
| - | 223 | */ |
|
| - | 224 | png_bytep row_buf; /* buffer to save current (unfiltered) row. |
|
| - | 225 | * This is a pointer into big_row_buf |
|
| 79 | png_bytep prev_row; /* buffer to save previous (unfiltered) row */ |
226 | */ |
| 80 | png_bytep row_buf; /* buffer to save current (unfiltered) row */ |
227 | #ifdef PNG_WRITE_SUPPORTED |
| 81 | png_bytep sub_row; /* buffer to save "sub" row when filtering */ |
228 | png_bytep sub_row; /* buffer to save "sub" row when filtering */ |
| 82 | png_bytep up_row; /* buffer to save "up" row when filtering */ |
229 | png_bytep up_row; /* buffer to save "up" row when filtering */ |
| - | 230 | png_bytep avg_row; /* buffer to save "avg" row when filtering */ |
|
| 83 | png_bytep avg_row; /* buffer to save "avg" row when filtering */ |
231 | png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ |
| Line 84... | Line 232... | ||
| 84 | png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ |
232 | #endif |
| 85 | png_row_info row_info; /* used for transformation routines */ |
233 | png_size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */ |
| 86 | 234 | ||
| 87 | png_uint_32 idat_size; /* current IDAT size for read */ |
235 | png_uint_32 idat_size; /* current IDAT size for read */ |
| - | 236 | png_uint_32 crc; /* current chunk CRC value */ |
|
| - | 237 | png_colorp palette; /* palette from the input file */ |
|
| - | 238 | png_uint_16 num_palette; /* number of color entries in palette */ |
|
| - | 239 | ||
| - | 240 | /* Added at libpng-1.5.10 */ |
|
| - | 241 | #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED |
|
| 88 | png_uint_32 crc; /* current chunk CRC value */ |
242 | int num_palette_max; /* maximum palette index found in IDAT */ |
| 89 | png_colorp palette; /* palette from the input file */ |
- | |
| 90 | png_uint_16 num_palette; /* number of color entries in palette */ |
243 | #endif |
| 91 | png_uint_16 num_trans; /* number of transparency values */ |
244 | |
| 92 | png_byte chunk_name[5]; /* null-terminated name of current chunk */ |
245 | png_uint_16 num_trans; /* number of transparency values */ |
| 93 | png_byte compression; /* file compression type (always 0) */ |
246 | png_byte compression; /* file compression type (always 0) */ |
| 94 | png_byte filter; /* file filter type (always 0) */ |
247 | png_byte filter; /* file filter type (always 0) */ |
| 95 | png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
248 | png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
| 96 | png_byte pass; /* current interlace pass (0 - 6) */ |
249 | png_byte pass; /* current interlace pass (0 - 6) */ |
| 97 | png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ |
250 | png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ |
| 98 | png_byte color_type; /* color type of file */ |
251 | png_byte color_type; /* color type of file */ |
| 99 | png_byte bit_depth; /* bit depth of file */ |
252 | png_byte bit_depth; /* bit depth of file */ |
| - | 253 | png_byte usr_bit_depth; /* bit depth of users row: write only */ |
|
| 100 | png_byte usr_bit_depth; /* bit depth of users row */ |
254 | png_byte pixel_depth; /* number of bits per pixel */ |
| - | 255 | png_byte channels; /* number of channels in file */ |
|
| 101 | png_byte pixel_depth; /* number of bits per pixel */ |
256 | #ifdef PNG_WRITE_SUPPORTED |
| 102 | png_byte channels; /* number of channels in file */ |
- | |
| - | 257 | png_byte usr_channels; /* channels at start of write: write only */ |
|
| - | 258 | #endif |
|
| - | 259 | png_byte sig_bytes; /* magic bytes read/written from start of file */ |
|
| - | 260 | png_byte maximum_pixel_depth; |
|
| 103 | png_byte usr_channels; /* channels at start of write */ |
261 | /* pixel depth used for the row buffers */ |
| 104 | png_byte sig_bytes; /* magic bytes read/written from start of file */ |
262 | png_byte transformed_pixel_depth; |
| 105 | 263 | /* pixel depth after read/write transforms */ |
|
| Line -... | Line 264... | ||
| - | 264 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
|
| 106 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
265 | png_uint_16 filler; /* filler bytes for pixel expansion */ |
| 107 | png_uint_16 filler; /* filler bytes for pixel expansion */ |
266 | #endif |
| 108 | #endif |
267 | |
| 109 | 268 | #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ |
|
| 110 | #ifdef PNG_bKGD_SUPPORTED |
269 | defined(PNG_READ_ALPHA_MODE_SUPPORTED) |
| 111 | png_byte background_gamma_type; |
270 | png_byte background_gamma_type; |
| Line 121... | Line 280... | ||
| 121 | png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ |
280 | png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ |
| 122 | png_uint_32 flush_rows; /* number of rows written since last flush */ |
281 | png_uint_32 flush_rows; /* number of rows written since last flush */ |
| 123 | #endif |
282 | #endif |
| 124 | 283 | ||
| Line 125... | Line 284... | ||
| 125 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
284 | #ifdef PNG_READ_GAMMA_SUPPORTED |
| 126 | int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */ |
285 | int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */ |
| 127 | png_fixed_point gamma; /* file gamma value */ |
- | |
| 128 | png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */ |
286 | png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */ |
| 129 | #endif |
- | |
| Line 130... | Line -... | ||
| 130 | - | ||
| 131 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
287 | |
| - | 288 | png_bytep gamma_table; /* gamma table for 8-bit depth files */ |
|
| - | 289 | png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ |
|
| - | 290 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ |
|
| - | 291 | defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \ |
|
| 132 | png_bytep gamma_table; /* gamma table for 8-bit depth files */ |
292 | defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
| 133 | png_bytep gamma_from_1; /* converts from 1.0 to screen */ |
293 | png_bytep gamma_from_1; /* converts from 1.0 to screen */ |
| 134 | png_bytep gamma_to_1; /* converts from file to 1.0 */ |
- | |
| 135 | png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ |
294 | png_bytep gamma_to_1; /* converts from file to 1.0 */ |
| 136 | png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ |
295 | png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ |
| - | 296 | png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ |
|
| 137 | png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ |
297 | #endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */ |
| Line 138... | Line 298... | ||
| 138 | #endif |
298 | #endif |
| 139 | 299 | ||
| 140 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) |
300 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) |
| Line 169... | Line 329... | ||
| 169 | png_size_t current_buffer_size; /* amount of data now in current_buffer */ |
329 | png_size_t current_buffer_size; /* amount of data now in current_buffer */ |
| 170 | int process_mode; /* what push library is currently doing */ |
330 | int process_mode; /* what push library is currently doing */ |
| 171 | int cur_palette; /* current push library palette index */ |
331 | int cur_palette; /* current push library palette index */ |
| 172 | 332 | ||
| Line 173... | Line -... | ||
| 173 | # ifdef PNG_TEXT_SUPPORTED |
- | |
| 174 | png_size_t current_text_size; /* current size of text input data */ |
- | |
| 175 | png_size_t current_text_left; /* how much text left to read in input */ |
- | |
| 176 | png_charp current_text; /* current text chunk buffer */ |
- | |
| 177 | png_charp current_text_ptr; /* current location in current_text */ |
- | |
| 178 | # endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */ |
- | |
| 179 | - | ||
| 180 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
333 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| Line 181... | Line 334... | ||
| 181 | 334 | ||
| 182 | #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) |
335 | #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) |
| 183 | /* For the Borland special 64K segment handler */ |
336 | /* For the Borland special 64K segment handler */ |
| Line 192... | Line 345... | ||
| 192 | png_bytep palette_lookup; /* lookup table for quantizing */ |
345 | png_bytep palette_lookup; /* lookup table for quantizing */ |
| 193 | png_bytep quantize_index; /* index translation for palette files */ |
346 | png_bytep quantize_index; /* index translation for palette files */ |
| 194 | #endif |
347 | #endif |
| 195 | 348 | ||
| Line 196... | Line -... | ||
| 196 | #if defined(PNG_READ_QUANTIZE_SUPPORTED) || defined(PNG_hIST_SUPPORTED) |
- | |
| 197 | png_uint_16p hist; /* histogram */ |
- | |
| 198 | #endif |
- | |
| 199 | - | ||
| 200 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
349 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
| 201 | png_byte heuristic_method; /* heuristic for row filter selection */ |
350 | png_byte heuristic_method; /* heuristic for row filter selection */ |
| 202 | png_byte num_prev_filters; /* number of weights for previous rows */ |
351 | png_byte num_prev_filters; /* number of weights for previous rows */ |
| 203 | png_bytep prev_filters; /* filter type(s) of previous row(s) */ |
352 | png_bytep prev_filters; /* filter type(s) of previous row(s) */ |
| 204 | png_uint_16p filter_weights; /* weight(s) for previous line(s) */ |
353 | png_uint_16p filter_weights; /* weight(s) for previous line(s) */ |
| 205 | png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ |
354 | png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ |
| 206 | png_uint_16p filter_costs; /* relative filter calculation cost */ |
355 | png_uint_16p filter_costs; /* relative filter calculation cost */ |
| 207 | png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ |
356 | png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ |
| 208 | #endif |
357 | #endif |
| Line -... | Line 358... | ||
| - | 358 | ||
| - | 359 | /* Options */ |
|
| - | 360 | #ifdef PNG_SET_OPTION_SUPPORTED |
|
| - | 361 | png_byte options; /* On/off state (up to 4 options) */ |
|
| - | 362 | #endif |
|
| - | 363 | ||
| - | 364 | #if PNG_LIBPNG_VER < 10700 |
|
| 209 | 365 | /* To do: remove this from libpng-1.7 */ |
|
| 210 | #ifdef PNG_TIME_RFC1123_SUPPORTED |
366 | #ifdef PNG_TIME_RFC1123_SUPPORTED |
| - | 367 | char time_buffer[29]; /* String to hold RFC 1123 time text */ |
|
| 211 | png_charp time_buffer; /* String to hold RFC 1123 time text */ |
368 | #endif |
| Line 212... | Line 369... | ||
| 212 | #endif |
369 | #endif |
| Line 213... | Line 370... | ||
| 213 | 370 | ||
| Line 214... | Line 371... | ||
| 214 | /* New members added in libpng-1.0.6 */ |
371 | /* New members added in libpng-1.0.6 */ |
| 215 | 372 | ||
| - | 373 | png_uint_32 free_me; /* flags items libpng is responsible for freeing */ |
|
| 216 | png_uint_32 free_me; /* flags items libpng is responsible for freeing */ |
374 | |
| 217 | 375 | #ifdef PNG_USER_CHUNKS_SUPPORTED |
|
| - | 376 | png_voidp user_chunk_ptr; |
|
| Line 218... | Line 377... | ||
| 218 | #ifdef PNG_USER_CHUNKS_SUPPORTED |
377 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED |
| - | 378 | png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ |
|
| 219 | png_voidp user_chunk_ptr; |
379 | #endif |
| 220 | png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ |
380 | #endif |
| - | 381 | ||
| 221 | #endif |
382 | #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED |
| Line 222... | Line 383... | ||
| 222 | 383 | int unknown_default; /* As PNG_HANDLE_* */ |
|
| 223 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
384 | unsigned int num_chunk_list; /* Number of entries in the list */ |
| 224 | int num_chunk_list; |
385 | png_bytep chunk_list; /* List of png_byte[5]; the textual chunk name |
| - | 386 | * followed by a PNG_HANDLE_* byte */ |
|
| - | 387 | #endif |
|
| 225 | png_bytep chunk_list; |
388 | |
| 226 | #endif |
389 | /* New members added in libpng-1.0.3 */ |
| 227 | 390 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
|
| 228 | /* New members added in libpng-1.0.3 */ |
391 | png_byte rgb_to_gray_status; |
| 229 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
392 | /* Added in libpng 1.5.5 to record setting of coefficients: */ |
| Line 230... | Line 393... | ||
| 230 | png_byte rgb_to_gray_status; |
393 | png_byte rgb_to_gray_coefficients_set; |
| 231 | /* These were changed from png_byte in libpng-1.0.6 */ |
394 | /* These were changed from png_byte in libpng-1.0.6 */ |
| 232 | png_uint_16 rgb_to_gray_red_coeff; |
- | |
| 233 | png_uint_16 rgb_to_gray_green_coeff; |
- | |
| 234 | png_uint_16 rgb_to_gray_blue_coeff; |
395 | png_uint_16 rgb_to_gray_red_coeff; |
| 235 | #endif |
396 | png_uint_16 rgb_to_gray_green_coeff; |
| 236 | 397 | /* deleted in 1.5.5: rgb_to_gray_blue_coeff; */ |
|
| Line 237... | Line 398... | ||
| 237 | /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ |
398 | #endif |
| Line 286... | Line 447... | ||
| 286 | png_alloc_size_t user_chunk_malloc_max; |
447 | png_alloc_size_t user_chunk_malloc_max; |
| 287 | #endif |
448 | #endif |
| 288 | 449 | ||
| Line 289... | Line 450... | ||
| 289 | /* New member added in libpng-1.0.25 and 1.2.17 */ |
450 | /* New member added in libpng-1.0.25 and 1.2.17 */ |
| 290 | #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED |
451 | #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED |
| 291 | /* Storage for unknown chunk that the library doesn't recognize. */ |
452 | /* Temporary storage for unknown chunk that the library doesn't recognize, |
| - | 453 | * used while reading the chunk. |
|
| - | 454 | */ |
|
| 292 | png_unknown_chunk unknown_chunk; |
455 | png_unknown_chunk unknown_chunk; |
| 293 | #endif |
456 | #endif |
| Line 294... | Line 457... | ||
| 294 | 457 | ||
| 295 | /* New members added in libpng-1.2.26 */ |
458 | /* New member added in libpng-1.2.26 */ |
| 296 | png_size_t old_big_row_buf_size; |
- | |
| Line -... | Line 459... | ||
| - | 459 | png_size_t old_big_row_buf_size; |
|
| 297 | png_size_t old_prev_row_size; |
460 | |
| 298 | 461 | #ifdef PNG_READ_SUPPORTED |
|
| - | 462 | /* New member added in libpng-1.2.30 */ |
|
| - | 463 | png_bytep read_buffer; /* buffer for reading chunk data */ |
|
| - | 464 | png_alloc_size_t read_buffer_size; /* current size of the buffer */ |
|
| - | 465 | #endif |
|
| - | 466 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
|
| Line 299... | Line 467... | ||
| 299 | /* New member added in libpng-1.2.30 */ |
467 | uInt IDAT_read_size; /* limit on read buffer size for IDAT */ |
| 300 | png_charp chunkdata; /* buffer for reading chunk data */ |
468 | #endif |
| 301 | 469 | ||
| 302 | #ifdef PNG_IO_STATE_SUPPORTED |
470 | #ifdef PNG_IO_STATE_SUPPORTED |
| - | 471 | /* New member added in libpng-1.4.0 */ |
|
| - | 472 | png_uint_32 io_state; |
|
| - | 473 | #endif |
|
| - | 474 | ||
| - | 475 | /* New member added in libpng-1.5.6 */ |
|
| - | 476 | png_bytep big_prev_row; |
|
| - | 477 | ||
| - | 478 | /* New member added in libpng-1.5.7 */ |
|
| - | 479 | void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info, |
|
| - | 480 | png_bytep row, png_const_bytep prev_row); |
|
| - | 481 | ||
| - | 482 | #ifdef PNG_READ_SUPPORTED |
|
| - | 483 | #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED) |
|
| 303 | /* New member added in libpng-1.4.0 */ |
484 | png_colorspace colorspace; |
| 304 | png_uint_32 io_state; |
485 | #endif |