Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * jpeglib.h |
| 3 | * |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 4 | * Copyright (C) 1991-1998, Thomas G. Lane. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 5 | * This file is part of the Independent JPEG Group's software. |
| 6 | * For conditions of distribution and use, see the accompanying README file. |
| 7 | * |
| 8 | * This file defines the application interface for the JPEG library. |
| 9 | * Most applications using the library need only include this file, |
| 10 | * and perhaps jerror.h if they want to know the exact error codes. |
| 11 | */ |
| 12 | |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 13 | #ifndef JPEGLIB_H |
| 14 | #define JPEGLIB_H |
| 15 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 16 | /* |
| 17 | * First we include the configuration files that record how this |
| 18 | * installation of the JPEG library is set up. jconfig.h can be |
| 19 | * generated automatically for many systems. jmorecfg.h contains |
| 20 | * manual configuration options that most people need not worry about. |
| 21 | */ |
| 22 | |
| 23 | #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */ |
| 24 | #include "jconfig.h" /* widely used configuration options */ |
| 25 | #endif |
| 26 | #include "jmorecfg.h" /* seldom changed options */ |
| 27 | |
| 28 | |
| 29 | /* Version ID for the JPEG library. |
| 30 | * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60". |
| 31 | */ |
| 32 | |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 33 | #define JPEG_LIB_VERSION 62 /* Version 6b */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 34 | |
| 35 | |
| 36 | /* Various constants determining the sizes of things. |
| 37 | * All of these are specified by the JPEG standard, so don't change them |
| 38 | * if you want to be compatible. |
| 39 | */ |
| 40 | |
| 41 | #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */ |
| 42 | #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */ |
| 43 | #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */ |
| 44 | #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */ |
| 45 | #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */ |
| 46 | #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */ |
| 47 | #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 48 | /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard; |
| 49 | * the PostScript DCT filter can emit files with many more than 10 blocks/MCU. |
| 50 | * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU |
| 51 | * to handle it. We even let you do this from the jconfig.h file. However, |
| 52 | * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe |
| 53 | * sometimes emits noncompliant files doesn't mean you should too. |
| 54 | */ |
| 55 | #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */ |
| 56 | #ifndef D_MAX_BLOCKS_IN_MCU |
| 57 | #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */ |
| 58 | #endif |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 59 | |
| 60 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 61 | /* Data structures for images (arrays of samples and of DCT coefficients). |
| 62 | * On 80x86 machines, the image arrays are too big for near pointers, |
| 63 | * but the pointer arrays can fit in near memory. |
| 64 | */ |
| 65 | |
| 66 | typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */ |
| 67 | typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */ |
| 68 | typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */ |
| 69 | |
| 70 | typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */ |
| 71 | typedef JBLOCK FAR *JBLOCKROW; /* pointer to one row of coefficient blocks */ |
| 72 | typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ |
| 73 | typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */ |
| 74 | |
| 75 | typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */ |
| 76 | |
| 77 | |
| 78 | /* Types for JPEG compression parameters and working tables. */ |
| 79 | |
| 80 | |
| 81 | /* DCT coefficient quantization tables. */ |
| 82 | |
| 83 | typedef struct { |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 84 | /* This array gives the coefficient quantizers in natural array order |
| 85 | * (not the zigzag order in which they are stored in a JPEG DQT marker). |
| 86 | * CAUTION: IJG versions prior to v6a kept this array in zigzag order. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 87 | */ |
| 88 | UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */ |
| 89 | /* This field is used only during compression. It's initialized FALSE when |
| 90 | * the table is created, and set TRUE when it's been output to the file. |
| 91 | * You could suppress output of a table by setting this to TRUE. |
| 92 | * (See jpeg_suppress_tables for an example.) |
| 93 | */ |
| 94 | boolean sent_table; /* TRUE when table has been output */ |
| 95 | } JQUANT_TBL; |
| 96 | |
| 97 | |
| 98 | /* Huffman coding tables. */ |
| 99 | |
| 100 | typedef struct { |
| 101 | /* These two fields directly represent the contents of a JPEG DHT marker */ |
| 102 | UINT8 bits[17]; /* bits[k] = # of symbols with codes of */ |
| 103 | /* length k bits; bits[0] is unused */ |
| 104 | UINT8 huffval[256]; /* The symbols, in order of incr code length */ |
| 105 | /* This field is used only during compression. It's initialized FALSE when |
| 106 | * the table is created, and set TRUE when it's been output to the file. |
| 107 | * You could suppress output of a table by setting this to TRUE. |
| 108 | * (See jpeg_suppress_tables for an example.) |
| 109 | */ |
| 110 | boolean sent_table; /* TRUE when table has been output */ |
| 111 | } JHUFF_TBL; |
| 112 | |
| 113 | |
| 114 | /* Basic info about one component (color channel). */ |
| 115 | |
| 116 | typedef struct { |
| 117 | /* These values are fixed over the whole image. */ |
| 118 | /* For compression, they must be supplied by parameter setup; */ |
| 119 | /* for decompression, they are read from the SOF marker. */ |
| 120 | int component_id; /* identifier for this component (0..255) */ |
| 121 | int component_index; /* its index in SOF or cinfo->comp_info[] */ |
| 122 | int h_samp_factor; /* horizontal sampling factor (1..4) */ |
| 123 | int v_samp_factor; /* vertical sampling factor (1..4) */ |
| 124 | int quant_tbl_no; /* quantization table selector (0..3) */ |
| 125 | /* These values may vary between scans. */ |
| 126 | /* For compression, they must be supplied by parameter setup; */ |
| 127 | /* for decompression, they are read from the SOS marker. */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 128 | /* The decompressor output side may not use these variables. */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 129 | int dc_tbl_no; /* DC entropy table selector (0..3) */ |
| 130 | int ac_tbl_no; /* AC entropy table selector (0..3) */ |
| 131 | |
| 132 | /* Remaining fields should be treated as private by applications. */ |
| 133 | |
| 134 | /* These values are computed during compression or decompression startup: */ |
| 135 | /* Component's size in DCT blocks. |
| 136 | * Any dummy blocks added to complete an MCU are not counted; therefore |
| 137 | * these values do not depend on whether a scan is interleaved or not. |
| 138 | */ |
| 139 | JDIMENSION width_in_blocks; |
| 140 | JDIMENSION height_in_blocks; |
| 141 | /* Size of a DCT block in samples. Always DCTSIZE for compression. |
| 142 | * For decompression this is the size of the output from one DCT block, |
| 143 | * reflecting any scaling we choose to apply during the IDCT step. |
| 144 | * Values of 1,2,4,8 are likely to be supported. Note that different |
| 145 | * components may receive different IDCT scalings. |
| 146 | */ |
| 147 | int DCT_scaled_size; |
| 148 | /* The downsampled dimensions are the component's actual, unpadded number |
| 149 | * of samples at the main buffer (preprocessing/compression interface), thus |
| 150 | * downsampled_width = ceil(image_width * Hi/Hmax) |
| 151 | * and similarly for height. For decompression, IDCT scaling is included, so |
| 152 | * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE) |
| 153 | */ |
| 154 | JDIMENSION downsampled_width; /* actual width in samples */ |
| 155 | JDIMENSION downsampled_height; /* actual height in samples */ |
| 156 | /* This flag is used only for decompression. In cases where some of the |
| 157 | * components will be ignored (eg grayscale output from YCbCr image), |
| 158 | * we can skip most computations for the unused components. |
| 159 | */ |
| 160 | boolean component_needed; /* do we need the value of this component? */ |
| 161 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 162 | /* These values are computed before starting a scan of the component. */ |
| 163 | /* The decompressor output side may not use these variables. */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 164 | int MCU_width; /* number of blocks per MCU, horizontally */ |
| 165 | int MCU_height; /* number of blocks per MCU, vertically */ |
| 166 | int MCU_blocks; /* MCU_width * MCU_height */ |
| 167 | int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */ |
| 168 | int last_col_width; /* # of non-dummy blocks across in last MCU */ |
| 169 | int last_row_height; /* # of non-dummy blocks down in last MCU */ |
| 170 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 171 | /* Saved quantization table for component; NULL if none yet saved. |
| 172 | * See jdinput.c comments about the need for this information. |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 173 | * This field is currently used only for decompression. |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 174 | */ |
| 175 | JQUANT_TBL * quant_table; |
| 176 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 177 | /* Private per-component storage for DCT or IDCT subsystem. */ |
| 178 | void * dct_table; |
| 179 | } jpeg_component_info; |
| 180 | |
| 181 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 182 | /* The script for encoding a multiple-scan file is an array of these: */ |
| 183 | |
| 184 | typedef struct { |
| 185 | int comps_in_scan; /* number of components encoded in this scan */ |
| 186 | int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */ |
| 187 | int Ss, Se; /* progressive JPEG spectral selection parms */ |
| 188 | int Ah, Al; /* progressive JPEG successive approx. parms */ |
| 189 | } jpeg_scan_info; |
| 190 | |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 191 | /* The decompressor can save APPn and COM markers in a list of these: */ |
| 192 | |
| 193 | typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr; |
| 194 | |
| 195 | struct jpeg_marker_struct { |
| 196 | jpeg_saved_marker_ptr next; /* next in list, or NULL */ |
| 197 | UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */ |
| 198 | unsigned int original_length; /* # bytes of data in the file */ |
| 199 | unsigned int data_length; /* # bytes of data saved at data[] */ |
| 200 | JOCTET FAR * data; /* the data contained in the marker */ |
| 201 | /* the marker length word is not counted in data_length or original_length */ |
| 202 | }; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 203 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 204 | /* Known color spaces. */ |
| 205 | |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 206 | #define JCS_EXTENSIONS 1 |
| 207 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 208 | typedef enum { |
| 209 | JCS_UNKNOWN, /* error/unspecified */ |
| 210 | JCS_GRAYSCALE, /* monochrome */ |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 211 | JCS_RGB, /* red/green/blue as specified by the RGB_RED, RGB_GREEN, |
| 212 | RGB_BLUE, and RGB_PIXELSIZE macros */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 213 | JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */ |
| 214 | JCS_CMYK, /* C/M/Y/K */ |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 215 | JCS_YCCK, /* Y/Cb/Cr/K */ |
| 216 | JCS_EXT_RGB, /* red/green/blue */ |
| 217 | JCS_EXT_RGBX, /* red/green/blue/x */ |
| 218 | JCS_EXT_BGR, /* blue/green/red */ |
| 219 | JCS_EXT_BGRX, /* blue/green/red/x */ |
| 220 | JCS_EXT_XBGR, /* x/blue/green/red */ |
| 221 | JCS_EXT_XRGB, /* x/red/green/blue */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 222 | } J_COLOR_SPACE; |
| 223 | |
| 224 | /* DCT/IDCT algorithm options. */ |
| 225 | |
| 226 | typedef enum { |
| 227 | JDCT_ISLOW, /* slow but accurate integer algorithm */ |
| 228 | JDCT_IFAST, /* faster, less accurate integer method */ |
| 229 | JDCT_FLOAT /* floating-point: accurate, fast on fast HW */ |
| 230 | } J_DCT_METHOD; |
| 231 | |
| 232 | #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */ |
| 233 | #define JDCT_DEFAULT JDCT_ISLOW |
| 234 | #endif |
| 235 | #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */ |
| 236 | #define JDCT_FASTEST JDCT_IFAST |
| 237 | #endif |
| 238 | |
| 239 | /* Dithering options for decompression. */ |
| 240 | |
| 241 | typedef enum { |
| 242 | JDITHER_NONE, /* no dithering */ |
| 243 | JDITHER_ORDERED, /* simple ordered dither */ |
| 244 | JDITHER_FS /* Floyd-Steinberg error diffusion dither */ |
| 245 | } J_DITHER_MODE; |
| 246 | |
| 247 | |
| 248 | /* Common fields between JPEG compression and decompression master structs. */ |
| 249 | |
| 250 | #define jpeg_common_fields \ |
| 251 | struct jpeg_error_mgr * err; /* Error handler module */\ |
| 252 | struct jpeg_memory_mgr * mem; /* Memory manager module */\ |
| 253 | struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\ |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 254 | void * client_data; /* Available for use by application */\ |
| 255 | boolean is_decompressor; /* So common code can tell which is which */\ |
| 256 | int global_state /* For checking call sequence validity */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 257 | |
| 258 | /* Routines that are to be used by both halves of the library are declared |
| 259 | * to receive a pointer to this structure. There are no actual instances of |
| 260 | * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct. |
| 261 | */ |
| 262 | struct jpeg_common_struct { |
| 263 | jpeg_common_fields; /* Fields common to both master struct types */ |
| 264 | /* Additional fields follow in an actual jpeg_compress_struct or |
| 265 | * jpeg_decompress_struct. All three structs must agree on these |
| 266 | * initial fields! (This would be a lot cleaner in C++.) |
| 267 | */ |
| 268 | }; |
| 269 | |
| 270 | typedef struct jpeg_common_struct * j_common_ptr; |
| 271 | typedef struct jpeg_compress_struct * j_compress_ptr; |
| 272 | typedef struct jpeg_decompress_struct * j_decompress_ptr; |
| 273 | |
| 274 | |
| 275 | /* Master record for a compression instance */ |
| 276 | |
| 277 | struct jpeg_compress_struct { |
| 278 | jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */ |
| 279 | |
| 280 | /* Destination for compressed data */ |
| 281 | struct jpeg_destination_mgr * dest; |
| 282 | |
| 283 | /* Description of source image --- these fields must be filled in by |
| 284 | * outer application before starting compression. in_color_space must |
| 285 | * be correct before you can even call jpeg_set_defaults(). |
| 286 | */ |
| 287 | |
| 288 | JDIMENSION image_width; /* input image width */ |
| 289 | JDIMENSION image_height; /* input image height */ |
| 290 | int input_components; /* # of color components in input image */ |
| 291 | J_COLOR_SPACE in_color_space; /* colorspace of input image */ |
| 292 | |
| 293 | double input_gamma; /* image gamma of input image */ |
| 294 | |
| 295 | /* Compression parameters --- these fields must be set before calling |
| 296 | * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to |
| 297 | * initialize everything to reasonable defaults, then changing anything |
| 298 | * the application specifically wants to change. That way you won't get |
| 299 | * burnt when new parameters are added. Also note that there are several |
| 300 | * helper routines to simplify changing parameters. |
| 301 | */ |
| 302 | |
| 303 | int data_precision; /* bits of precision in image data */ |
| 304 | |
| 305 | int num_components; /* # of color components in JPEG image */ |
| 306 | J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ |
| 307 | |
| 308 | jpeg_component_info * comp_info; |
| 309 | /* comp_info[i] describes component that appears i'th in SOF */ |
| 310 | |
| 311 | JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; |
| 312 | /* ptrs to coefficient quantization tables, or NULL if not defined */ |
| 313 | |
| 314 | JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| 315 | JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| 316 | /* ptrs to Huffman coding tables, or NULL if not defined */ |
| 317 | |
| 318 | UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ |
| 319 | UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ |
| 320 | UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ |
| 321 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 322 | int num_scans; /* # of entries in scan_info array */ |
| 323 | const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */ |
| 324 | /* The default value of scan_info is NULL, which causes a single-scan |
| 325 | * sequential JPEG file to be emitted. To create a multi-scan file, |
| 326 | * set num_scans and scan_info to point to an array of scan definitions. |
| 327 | */ |
| 328 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 329 | boolean raw_data_in; /* TRUE=caller supplies downsampled data */ |
| 330 | boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 331 | boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ |
| 332 | boolean CCIR601_sampling; /* TRUE=first samples are cosited */ |
| 333 | int smoothing_factor; /* 1..100, or 0 for no input smoothing */ |
| 334 | J_DCT_METHOD dct_method; /* DCT algorithm selector */ |
| 335 | |
| 336 | /* The restart interval can be specified in absolute MCUs by setting |
| 337 | * restart_interval, or in MCU rows by setting restart_in_rows |
| 338 | * (in which case the correct restart_interval will be figured |
| 339 | * for each scan). |
| 340 | */ |
| 341 | unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */ |
| 342 | int restart_in_rows; /* if > 0, MCU rows per restart interval */ |
| 343 | |
| 344 | /* Parameters controlling emission of special markers. */ |
| 345 | |
| 346 | boolean write_JFIF_header; /* should a JFIF marker be written? */ |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 347 | UINT8 JFIF_major_version; /* What to write for the JFIF version number */ |
| 348 | UINT8 JFIF_minor_version; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 349 | /* These three values are not used by the JPEG code, merely copied */ |
| 350 | /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */ |
| 351 | /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */ |
| 352 | /* ratio is defined by X_density/Y_density even when density_unit=0. */ |
| 353 | UINT8 density_unit; /* JFIF code for pixel size units */ |
| 354 | UINT16 X_density; /* Horizontal pixel density */ |
| 355 | UINT16 Y_density; /* Vertical pixel density */ |
| 356 | boolean write_Adobe_marker; /* should an Adobe marker be written? */ |
| 357 | |
| 358 | /* State variable: index of next scanline to be written to |
| 359 | * jpeg_write_scanlines(). Application may use this to control its |
| 360 | * processing loop, e.g., "while (next_scanline < image_height)". |
| 361 | */ |
| 362 | |
| 363 | JDIMENSION next_scanline; /* 0 .. image_height-1 */ |
| 364 | |
| 365 | /* Remaining fields are known throughout compressor, but generally |
| 366 | * should not be touched by a surrounding application. |
| 367 | */ |
| 368 | |
| 369 | /* |
| 370 | * These fields are computed during compression startup |
| 371 | */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 372 | boolean progressive_mode; /* TRUE if scan script uses progressive mode */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 373 | int max_h_samp_factor; /* largest h_samp_factor */ |
| 374 | int max_v_samp_factor; /* largest v_samp_factor */ |
| 375 | |
| 376 | JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */ |
| 377 | /* The coefficient controller receives data in units of MCU rows as defined |
| 378 | * for fully interleaved scans (whether the JPEG file is interleaved or not). |
| 379 | * There are v_samp_factor * DCTSIZE sample rows of each component in an |
| 380 | * "iMCU" (interleaved MCU) row. |
| 381 | */ |
| 382 | |
| 383 | /* |
| 384 | * These fields are valid during any one scan. |
| 385 | * They describe the components and MCUs actually appearing in the scan. |
| 386 | */ |
| 387 | int comps_in_scan; /* # of JPEG components in this scan */ |
| 388 | jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; |
| 389 | /* *cur_comp_info[i] describes component that appears i'th in SOS */ |
| 390 | |
| 391 | JDIMENSION MCUs_per_row; /* # of MCUs across the image */ |
| 392 | JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ |
| 393 | |
| 394 | int blocks_in_MCU; /* # of DCT blocks per MCU */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 395 | int MCU_membership[C_MAX_BLOCKS_IN_MCU]; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 396 | /* MCU_membership[i] is index in cur_comp_info of component owning */ |
| 397 | /* i'th block in an MCU */ |
| 398 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 399 | int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ |
| 400 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 401 | /* |
| 402 | * Links to compression subobjects (methods and private variables of modules) |
| 403 | */ |
| 404 | struct jpeg_comp_master * master; |
| 405 | struct jpeg_c_main_controller * main; |
| 406 | struct jpeg_c_prep_controller * prep; |
| 407 | struct jpeg_c_coef_controller * coef; |
| 408 | struct jpeg_marker_writer * marker; |
| 409 | struct jpeg_color_converter * cconvert; |
| 410 | struct jpeg_downsampler * downsample; |
| 411 | struct jpeg_forward_dct * fdct; |
| 412 | struct jpeg_entropy_encoder * entropy; |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 413 | jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */ |
| 414 | int script_space_size; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 415 | }; |
| 416 | |
| 417 | |
| 418 | /* Master record for a decompression instance */ |
| 419 | |
| 420 | struct jpeg_decompress_struct { |
| 421 | jpeg_common_fields; /* Fields shared with jpeg_compress_struct */ |
| 422 | |
| 423 | /* Source of compressed data */ |
| 424 | struct jpeg_source_mgr * src; |
| 425 | |
| 426 | /* Basic description of image --- filled in by jpeg_read_header(). */ |
| 427 | /* Application may inspect these values to decide how to process image. */ |
| 428 | |
| 429 | JDIMENSION image_width; /* nominal image width (from SOF marker) */ |
| 430 | JDIMENSION image_height; /* nominal image height */ |
| 431 | int num_components; /* # of color components in JPEG image */ |
| 432 | J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ |
| 433 | |
| 434 | /* Decompression processing parameters --- these fields must be set before |
| 435 | * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes |
| 436 | * them to default values. |
| 437 | */ |
| 438 | |
| 439 | J_COLOR_SPACE out_color_space; /* colorspace for output */ |
| 440 | |
| 441 | unsigned int scale_num, scale_denom; /* fraction by which to scale image */ |
| 442 | |
| 443 | double output_gamma; /* image gamma wanted in output */ |
| 444 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 445 | boolean buffered_image; /* TRUE=multiple output passes */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 446 | boolean raw_data_out; /* TRUE=downsampled data wanted */ |
| 447 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 448 | J_DCT_METHOD dct_method; /* IDCT algorithm selector */ |
| 449 | boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */ |
| 450 | boolean do_block_smoothing; /* TRUE=apply interblock smoothing */ |
| 451 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 452 | boolean quantize_colors; /* TRUE=colormapped output wanted */ |
| 453 | /* the following are ignored if not quantize_colors: */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 454 | J_DITHER_MODE dither_mode; /* type of color dithering to use */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 455 | boolean two_pass_quantize; /* TRUE=use two-pass color quantization */ |
| 456 | int desired_number_of_colors; /* max # colors to use in created colormap */ |
| 457 | /* these are significant only in buffered-image mode: */ |
| 458 | boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ |
| 459 | boolean enable_external_quant;/* enable future use of external colormap */ |
| 460 | boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 461 | |
| 462 | /* Description of actual output image that will be returned to application. |
| 463 | * These fields are computed by jpeg_start_decompress(). |
| 464 | * You can also use jpeg_calc_output_dimensions() to determine these values |
| 465 | * in advance of calling jpeg_start_decompress(). |
| 466 | */ |
| 467 | |
| 468 | JDIMENSION output_width; /* scaled image width */ |
| 469 | JDIMENSION output_height; /* scaled image height */ |
| 470 | int out_color_components; /* # of color components in out_color_space */ |
| 471 | int output_components; /* # of color components returned */ |
| 472 | /* output_components is 1 (a colormap index) when quantizing colors; |
| 473 | * otherwise it equals out_color_components. |
| 474 | */ |
| 475 | int rec_outbuf_height; /* min recommended height of scanline buffer */ |
| 476 | /* If the buffer passed to jpeg_read_scanlines() is less than this many rows |
| 477 | * high, space and time will be wasted due to unnecessary data copying. |
| 478 | * Usually rec_outbuf_height will be 1 or 2, at most 4. |
| 479 | */ |
| 480 | |
| 481 | /* When quantizing colors, the output colormap is described by these fields. |
| 482 | * The application can supply a colormap by setting colormap non-NULL before |
| 483 | * calling jpeg_start_decompress; otherwise a colormap is created during |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 484 | * jpeg_start_decompress or jpeg_start_output. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 485 | * The map has out_color_components rows and actual_number_of_colors columns. |
| 486 | */ |
| 487 | int actual_number_of_colors; /* number of entries in use */ |
| 488 | JSAMPARRAY colormap; /* The color map as a 2-D pixel array */ |
| 489 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 490 | /* State variables: these variables indicate the progress of decompression. |
| 491 | * The application may examine these but must not modify them. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 492 | */ |
| 493 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 494 | /* Row index of next scanline to be read from jpeg_read_scanlines(). |
| 495 | * Application may use this to control its processing loop, e.g., |
| 496 | * "while (output_scanline < output_height)". |
| 497 | */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 498 | JDIMENSION output_scanline; /* 0 .. output_height-1 */ |
| 499 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 500 | /* Current input scan number and number of iMCU rows completed in scan. |
| 501 | * These indicate the progress of the decompressor input side. |
| 502 | */ |
| 503 | int input_scan_number; /* Number of SOS markers seen so far */ |
| 504 | JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */ |
| 505 | |
| 506 | /* The "output scan number" is the notional scan being displayed by the |
| 507 | * output side. The decompressor will not allow output scan/row number |
| 508 | * to get ahead of input scan/row, but it can fall arbitrarily far behind. |
| 509 | */ |
| 510 | int output_scan_number; /* Nominal scan number being displayed */ |
| 511 | JDIMENSION output_iMCU_row; /* Number of iMCU rows read */ |
| 512 | |
| 513 | /* Current progression status. coef_bits[c][i] indicates the precision |
| 514 | * with which component c's DCT coefficient i (in zigzag order) is known. |
| 515 | * It is -1 when no data has yet been received, otherwise it is the point |
| 516 | * transform (shift) value for the most recent scan of the coefficient |
| 517 | * (thus, 0 at completion of the progression). |
| 518 | * This pointer is NULL when reading a non-progressive file. |
| 519 | */ |
| 520 | int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */ |
| 521 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 522 | /* Internal JPEG parameters --- the application usually need not look at |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 523 | * these fields. Note that the decompressor output side may not use |
| 524 | * any parameters that can change between scans. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 525 | */ |
| 526 | |
| 527 | /* Quantization and Huffman tables are carried forward across input |
| 528 | * datastreams when processing abbreviated JPEG datastreams. |
| 529 | */ |
| 530 | |
| 531 | JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; |
| 532 | /* ptrs to coefficient quantization tables, or NULL if not defined */ |
| 533 | |
| 534 | JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| 535 | JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| 536 | /* ptrs to Huffman coding tables, or NULL if not defined */ |
| 537 | |
| 538 | /* These parameters are never carried across datastreams, since they |
| 539 | * are given in SOF/SOS markers or defined to be reset by SOI. |
| 540 | */ |
| 541 | |
| 542 | int data_precision; /* bits of precision in image data */ |
| 543 | |
| 544 | jpeg_component_info * comp_info; |
| 545 | /* comp_info[i] describes component that appears i'th in SOF */ |
| 546 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 547 | boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */ |
| 548 | boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ |
| 549 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 550 | UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ |
| 551 | UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ |
| 552 | UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ |
| 553 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 554 | unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */ |
| 555 | |
| 556 | /* These fields record data obtained from optional markers recognized by |
| 557 | * the JPEG library. |
| 558 | */ |
| 559 | boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */ |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 560 | /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */ |
| 561 | UINT8 JFIF_major_version; /* JFIF version number */ |
| 562 | UINT8 JFIF_minor_version; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 563 | UINT8 density_unit; /* JFIF code for pixel size units */ |
| 564 | UINT16 X_density; /* Horizontal pixel density */ |
| 565 | UINT16 Y_density; /* Vertical pixel density */ |
| 566 | boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */ |
| 567 | UINT8 Adobe_transform; /* Color transform code from Adobe marker */ |
| 568 | |
| 569 | boolean CCIR601_sampling; /* TRUE=first samples are cosited */ |
| 570 | |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 571 | /* Aside from the specific data retained from APPn markers known to the |
| 572 | * library, the uninterpreted contents of any or all APPn and COM markers |
| 573 | * can be saved in a list for examination by the application. |
| 574 | */ |
| 575 | jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */ |
| 576 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 577 | /* Remaining fields are known throughout decompressor, but generally |
| 578 | * should not be touched by a surrounding application. |
| 579 | */ |
| 580 | |
| 581 | /* |
| 582 | * These fields are computed during decompression startup |
| 583 | */ |
| 584 | int max_h_samp_factor; /* largest h_samp_factor */ |
| 585 | int max_v_samp_factor; /* largest v_samp_factor */ |
| 586 | |
| 587 | int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */ |
| 588 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 589 | JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */ |
| 590 | /* The coefficient controller's input and output progress is measured in |
| 591 | * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows |
| 592 | * in fully interleaved JPEG scans, but are used whether the scan is |
| 593 | * interleaved or not. We define an iMCU row as v_samp_factor DCT block |
| 594 | * rows of each component. Therefore, the IDCT output contains |
| 595 | * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 596 | */ |
| 597 | |
| 598 | JSAMPLE * sample_range_limit; /* table for fast range-limiting */ |
| 599 | |
| 600 | /* |
| 601 | * These fields are valid during any one scan. |
| 602 | * They describe the components and MCUs actually appearing in the scan. |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 603 | * Note that the decompressor output side must not use these fields. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 604 | */ |
| 605 | int comps_in_scan; /* # of JPEG components in this scan */ |
| 606 | jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; |
| 607 | /* *cur_comp_info[i] describes component that appears i'th in SOS */ |
| 608 | |
| 609 | JDIMENSION MCUs_per_row; /* # of MCUs across the image */ |
| 610 | JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ |
| 611 | |
| 612 | int blocks_in_MCU; /* # of DCT blocks per MCU */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 613 | int MCU_membership[D_MAX_BLOCKS_IN_MCU]; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 614 | /* MCU_membership[i] is index in cur_comp_info of component owning */ |
| 615 | /* i'th block in an MCU */ |
| 616 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 617 | int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ |
| 618 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 619 | /* This field is shared between entropy decoder and marker parser. |
| 620 | * It is either zero or the code of a JPEG marker that has been |
| 621 | * read from the data source, but has not yet been processed. |
| 622 | */ |
| 623 | int unread_marker; |
| 624 | |
| 625 | /* |
| 626 | * Links to decompression subobjects (methods, private variables of modules) |
| 627 | */ |
| 628 | struct jpeg_decomp_master * master; |
| 629 | struct jpeg_d_main_controller * main; |
| 630 | struct jpeg_d_coef_controller * coef; |
| 631 | struct jpeg_d_post_controller * post; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 632 | struct jpeg_input_controller * inputctl; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 633 | struct jpeg_marker_reader * marker; |
| 634 | struct jpeg_entropy_decoder * entropy; |
| 635 | struct jpeg_inverse_dct * idct; |
| 636 | struct jpeg_upsampler * upsample; |
| 637 | struct jpeg_color_deconverter * cconvert; |
| 638 | struct jpeg_color_quantizer * cquantize; |
| 639 | }; |
| 640 | |
| 641 | |
| 642 | /* "Object" declarations for JPEG modules that may be supplied or called |
| 643 | * directly by the surrounding application. |
| 644 | * As with all objects in the JPEG library, these structs only define the |
| 645 | * publicly visible methods and state variables of a module. Additional |
| 646 | * private fields may exist after the public ones. |
| 647 | */ |
| 648 | |
| 649 | |
| 650 | /* Error handler object */ |
| 651 | |
| 652 | struct jpeg_error_mgr { |
| 653 | /* Error exit handler: does not return to caller */ |
| 654 | JMETHOD(void, error_exit, (j_common_ptr cinfo)); |
| 655 | /* Conditionally emit a trace or warning message */ |
| 656 | JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level)); |
| 657 | /* Routine that actually outputs a trace or error message */ |
| 658 | JMETHOD(void, output_message, (j_common_ptr cinfo)); |
| 659 | /* Format a message string for the most recent JPEG error or message */ |
| 660 | JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer)); |
| 661 | #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */ |
| 662 | /* Reset error state variables at start of a new image */ |
| 663 | JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo)); |
| 664 | |
| 665 | /* The message ID code and any parameters are saved here. |
| 666 | * A message can have one string parameter or up to 8 int parameters. |
| 667 | */ |
| 668 | int msg_code; |
| 669 | #define JMSG_STR_PARM_MAX 80 |
| 670 | union { |
| 671 | int i[8]; |
| 672 | char s[JMSG_STR_PARM_MAX]; |
| 673 | } msg_parm; |
| 674 | |
| 675 | /* Standard state variables for error facility */ |
| 676 | |
| 677 | int trace_level; /* max msg_level that will be displayed */ |
| 678 | |
| 679 | /* For recoverable corrupt-data errors, we emit a warning message, |
| 680 | * but keep going unless emit_message chooses to abort. emit_message |
| 681 | * should count warnings in num_warnings. The surrounding application |
| 682 | * can check for bad data by seeing if num_warnings is nonzero at the |
| 683 | * end of processing. |
| 684 | */ |
| 685 | long num_warnings; /* number of corrupt-data warnings */ |
| 686 | |
| 687 | /* These fields point to the table(s) of error message strings. |
| 688 | * An application can change the table pointer to switch to a different |
| 689 | * message list (typically, to change the language in which errors are |
| 690 | * reported). Some applications may wish to add additional error codes |
| 691 | * that will be handled by the JPEG library error mechanism; the second |
| 692 | * table pointer is used for this purpose. |
| 693 | * |
| 694 | * First table includes all errors generated by JPEG library itself. |
| 695 | * Error code 0 is reserved for a "no such error string" message. |
| 696 | */ |
| 697 | const char * const * jpeg_message_table; /* Library errors */ |
| 698 | int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */ |
| 699 | /* Second table can be added by application (see cjpeg/djpeg for example). |
| 700 | * It contains strings numbered first_addon_message..last_addon_message. |
| 701 | */ |
| 702 | const char * const * addon_message_table; /* Non-library errors */ |
| 703 | int first_addon_message; /* code for first string in addon table */ |
| 704 | int last_addon_message; /* code for last string in addon table */ |
| 705 | }; |
| 706 | |
| 707 | |
| 708 | /* Progress monitor object */ |
| 709 | |
| 710 | struct jpeg_progress_mgr { |
| 711 | JMETHOD(void, progress_monitor, (j_common_ptr cinfo)); |
| 712 | |
| 713 | long pass_counter; /* work units completed in this pass */ |
| 714 | long pass_limit; /* total number of work units in this pass */ |
| 715 | int completed_passes; /* passes completed so far */ |
| 716 | int total_passes; /* total number of passes expected */ |
| 717 | }; |
| 718 | |
| 719 | |
| 720 | /* Data destination object for compression */ |
| 721 | |
| 722 | struct jpeg_destination_mgr { |
| 723 | JOCTET * next_output_byte; /* => next byte to write in buffer */ |
| 724 | size_t free_in_buffer; /* # of byte spaces remaining in buffer */ |
| 725 | |
| 726 | JMETHOD(void, init_destination, (j_compress_ptr cinfo)); |
| 727 | JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo)); |
| 728 | JMETHOD(void, term_destination, (j_compress_ptr cinfo)); |
| 729 | }; |
| 730 | |
| 731 | |
| 732 | /* Data source object for decompression */ |
| 733 | |
| 734 | struct jpeg_source_mgr { |
| 735 | const JOCTET * next_input_byte; /* => next byte to read from buffer */ |
| 736 | size_t bytes_in_buffer; /* # of bytes remaining in buffer */ |
| 737 | |
| 738 | JMETHOD(void, init_source, (j_decompress_ptr cinfo)); |
| 739 | JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo)); |
| 740 | JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes)); |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 741 | JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 742 | JMETHOD(void, term_source, (j_decompress_ptr cinfo)); |
| 743 | }; |
| 744 | |
| 745 | |
| 746 | /* Memory manager object. |
| 747 | * Allocates "small" objects (a few K total), "large" objects (tens of K), |
| 748 | * and "really big" objects (virtual arrays with backing store if needed). |
| 749 | * The memory manager does not allow individual objects to be freed; rather, |
| 750 | * each created object is assigned to a pool, and whole pools can be freed |
| 751 | * at once. This is faster and more convenient than remembering exactly what |
| 752 | * to free, especially where malloc()/free() are not too speedy. |
| 753 | * NB: alloc routines never return NULL. They exit to error_exit if not |
| 754 | * successful. |
| 755 | */ |
| 756 | |
| 757 | #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */ |
| 758 | #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */ |
| 759 | #define JPOOL_NUMPOOLS 2 |
| 760 | |
| 761 | typedef struct jvirt_sarray_control * jvirt_sarray_ptr; |
| 762 | typedef struct jvirt_barray_control * jvirt_barray_ptr; |
| 763 | |
| 764 | |
| 765 | struct jpeg_memory_mgr { |
| 766 | /* Method pointers */ |
| 767 | JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id, |
| 768 | size_t sizeofobject)); |
| 769 | JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id, |
| 770 | size_t sizeofobject)); |
| 771 | JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id, |
| 772 | JDIMENSION samplesperrow, |
| 773 | JDIMENSION numrows)); |
| 774 | JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id, |
| 775 | JDIMENSION blocksperrow, |
| 776 | JDIMENSION numrows)); |
| 777 | JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo, |
| 778 | int pool_id, |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 779 | boolean pre_zero, |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 780 | JDIMENSION samplesperrow, |
| 781 | JDIMENSION numrows, |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 782 | JDIMENSION maxaccess)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 783 | JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo, |
| 784 | int pool_id, |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 785 | boolean pre_zero, |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 786 | JDIMENSION blocksperrow, |
| 787 | JDIMENSION numrows, |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 788 | JDIMENSION maxaccess)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 789 | JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo)); |
| 790 | JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo, |
| 791 | jvirt_sarray_ptr ptr, |
| 792 | JDIMENSION start_row, |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 793 | JDIMENSION num_rows, |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 794 | boolean writable)); |
| 795 | JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo, |
| 796 | jvirt_barray_ptr ptr, |
| 797 | JDIMENSION start_row, |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 798 | JDIMENSION num_rows, |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 799 | boolean writable)); |
| 800 | JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id)); |
| 801 | JMETHOD(void, self_destruct, (j_common_ptr cinfo)); |
| 802 | |
| 803 | /* Limit on memory allocation for this JPEG object. (Note that this is |
| 804 | * merely advisory, not a guaranteed maximum; it only affects the space |
| 805 | * used for virtual-array buffers.) May be changed by outer application |
| 806 | * after creating the JPEG object. |
| 807 | */ |
| 808 | long max_memory_to_use; |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 809 | |
| 810 | /* Maximum allocation request accepted by alloc_large. */ |
| 811 | long max_alloc_chunk; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 812 | }; |
| 813 | |
| 814 | |
| 815 | /* Routine signature for application-supplied marker processing methods. |
| 816 | * Need not pass marker code since it is stored in cinfo->unread_marker. |
| 817 | */ |
| 818 | typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo)); |
| 819 | |
| 820 | |
| 821 | /* Declarations for routines called by application. |
| 822 | * The JPP macro hides prototype parameters from compilers that can't cope. |
| 823 | * Note JPP requires double parentheses. |
| 824 | */ |
| 825 | |
| 826 | #ifdef HAVE_PROTOTYPES |
| 827 | #define JPP(arglist) arglist |
| 828 | #else |
| 829 | #define JPP(arglist) () |
| 830 | #endif |
| 831 | |
| 832 | |
| 833 | /* Short forms of external names for systems with brain-damaged linkers. |
| 834 | * We shorten external names to be unique in the first six letters, which |
| 835 | * is good enough for all known systems. |
| 836 | * (If your compiler itself needs names to be unique in less than 15 |
| 837 | * characters, you are out of luck. Get a better compiler.) |
| 838 | */ |
| 839 | |
| 840 | #ifdef NEED_SHORT_EXTERNAL_NAMES |
| 841 | #define jpeg_std_error jStdError |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 842 | #define jpeg_CreateCompress jCreaCompress |
| 843 | #define jpeg_CreateDecompress jCreaDecompress |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 844 | #define jpeg_destroy_compress jDestCompress |
| 845 | #define jpeg_destroy_decompress jDestDecompress |
| 846 | #define jpeg_stdio_dest jStdDest |
| 847 | #define jpeg_stdio_src jStdSrc |
| 848 | #define jpeg_set_defaults jSetDefaults |
| 849 | #define jpeg_set_colorspace jSetColorspace |
| 850 | #define jpeg_default_colorspace jDefColorspace |
| 851 | #define jpeg_set_quality jSetQuality |
| 852 | #define jpeg_set_linear_quality jSetLQuality |
| 853 | #define jpeg_add_quant_table jAddQuantTable |
| 854 | #define jpeg_quality_scaling jQualityScaling |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 855 | #define jpeg_simple_progression jSimProgress |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 856 | #define jpeg_suppress_tables jSuppressTables |
| 857 | #define jpeg_alloc_quant_table jAlcQTable |
| 858 | #define jpeg_alloc_huff_table jAlcHTable |
| 859 | #define jpeg_start_compress jStrtCompress |
| 860 | #define jpeg_write_scanlines jWrtScanlines |
| 861 | #define jpeg_finish_compress jFinCompress |
| 862 | #define jpeg_write_raw_data jWrtRawData |
| 863 | #define jpeg_write_marker jWrtMarker |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 864 | #define jpeg_write_m_header jWrtMHeader |
| 865 | #define jpeg_write_m_byte jWrtMByte |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 866 | #define jpeg_write_tables jWrtTables |
| 867 | #define jpeg_read_header jReadHeader |
| 868 | #define jpeg_start_decompress jStrtDecompress |
| 869 | #define jpeg_read_scanlines jReadScanlines |
| 870 | #define jpeg_finish_decompress jFinDecompress |
| 871 | #define jpeg_read_raw_data jReadRawData |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 872 | #define jpeg_has_multiple_scans jHasMultScn |
| 873 | #define jpeg_start_output jStrtOutput |
| 874 | #define jpeg_finish_output jFinOutput |
| 875 | #define jpeg_input_complete jInComplete |
| 876 | #define jpeg_new_colormap jNewCMap |
| 877 | #define jpeg_consume_input jConsumeInput |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 878 | #define jpeg_calc_output_dimensions jCalcDimensions |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 879 | #define jpeg_save_markers jSaveMarkers |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 880 | #define jpeg_set_marker_processor jSetMarker |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 881 | #define jpeg_read_coefficients jReadCoefs |
| 882 | #define jpeg_write_coefficients jWrtCoefs |
| 883 | #define jpeg_copy_critical_parameters jCopyCrit |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 884 | #define jpeg_abort_compress jAbrtCompress |
| 885 | #define jpeg_abort_decompress jAbrtDecompress |
| 886 | #define jpeg_abort jAbort |
| 887 | #define jpeg_destroy jDestroy |
| 888 | #define jpeg_resync_to_restart jResyncRestart |
| 889 | #endif /* NEED_SHORT_EXTERNAL_NAMES */ |
| 890 | |
| 891 | |
| 892 | /* Default error-management setup */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 893 | EXTERN(struct jpeg_error_mgr *) jpeg_std_error |
| 894 | JPP((struct jpeg_error_mgr * err)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 895 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 896 | /* Initialization of JPEG compression objects. |
| 897 | * jpeg_create_compress() and jpeg_create_decompress() are the exported |
| 898 | * names that applications should call. These expand to calls on |
| 899 | * jpeg_CreateCompress and jpeg_CreateDecompress with additional information |
| 900 | * passed for version mismatch checking. |
| 901 | * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx. |
| 902 | */ |
| 903 | #define jpeg_create_compress(cinfo) \ |
| 904 | jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \ |
| 905 | (size_t) sizeof(struct jpeg_compress_struct)) |
| 906 | #define jpeg_create_decompress(cinfo) \ |
| 907 | jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \ |
| 908 | (size_t) sizeof(struct jpeg_decompress_struct)) |
| 909 | EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo, |
| 910 | int version, size_t structsize)); |
| 911 | EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo, |
| 912 | int version, size_t structsize)); |
| 913 | /* Destruction of JPEG compression objects */ |
| 914 | EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo)); |
| 915 | EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 916 | |
| 917 | /* Standard data source and destination managers: stdio streams. */ |
| 918 | /* Caller is responsible for opening the file before and closing after. */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 919 | EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile)); |
| 920 | EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 921 | |
| 922 | /* Default parameter setup for compression */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 923 | EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 924 | /* Compression parameter setup aids */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 925 | EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo, |
| 926 | J_COLOR_SPACE colorspace)); |
| 927 | EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo)); |
| 928 | EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality, |
| 929 | boolean force_baseline)); |
| 930 | EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo, |
| 931 | int scale_factor, |
| 932 | boolean force_baseline)); |
| 933 | EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl, |
| 934 | const unsigned int *basic_table, |
| 935 | int scale_factor, |
| 936 | boolean force_baseline)); |
| 937 | EXTERN(int) jpeg_quality_scaling JPP((int quality)); |
| 938 | EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo)); |
| 939 | EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo, |
| 940 | boolean suppress)); |
| 941 | EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo)); |
| 942 | EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 943 | |
| 944 | /* Main entry points for compression */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 945 | EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo, |
| 946 | boolean write_all_tables)); |
| 947 | EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo, |
| 948 | JSAMPARRAY scanlines, |
| 949 | JDIMENSION num_lines)); |
| 950 | EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 951 | |
| 952 | /* Replaces jpeg_write_scanlines when writing raw downsampled data. */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 953 | EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo, |
| 954 | JSAMPIMAGE data, |
| 955 | JDIMENSION num_lines)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 956 | |
| 957 | /* Write a special marker. See libjpeg.doc concerning safe usage. */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 958 | EXTERN(void) jpeg_write_marker |
| 959 | JPP((j_compress_ptr cinfo, int marker, |
| 960 | const JOCTET * dataptr, unsigned int datalen)); |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 961 | /* Same, but piecemeal. */ |
| 962 | EXTERN(void) jpeg_write_m_header |
| 963 | JPP((j_compress_ptr cinfo, int marker, unsigned int datalen)); |
| 964 | EXTERN(void) jpeg_write_m_byte |
| 965 | JPP((j_compress_ptr cinfo, int val)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 966 | |
| 967 | /* Alternate compression function: just write an abbreviated table file */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 968 | EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 969 | |
| 970 | /* Decompression startup: read start of JPEG datastream to see what's there */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 971 | EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo, |
| 972 | boolean require_image)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 973 | /* Return value is one of: */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 974 | #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ |
| 975 | #define JPEG_HEADER_OK 1 /* Found valid image datastream */ |
| 976 | #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 977 | /* If you pass require_image = TRUE (normal case), you need not check for |
| 978 | * a TABLES_ONLY return code; an abbreviated file will cause an error exit. |
| 979 | * JPEG_SUSPENDED is only possible if you use a data source module that can |
| 980 | * give a suspension return (the stdio source module doesn't). |
| 981 | */ |
| 982 | |
| 983 | /* Main entry points for decompression */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 984 | EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo)); |
| 985 | EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo, |
| 986 | JSAMPARRAY scanlines, |
| 987 | JDIMENSION max_lines)); |
| 988 | EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 989 | |
| 990 | /* Replaces jpeg_read_scanlines when reading raw downsampled data. */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 991 | EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo, |
| 992 | JSAMPIMAGE data, |
| 993 | JDIMENSION max_lines)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 994 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 995 | /* Additional entry points for buffered-image mode. */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 996 | EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo)); |
| 997 | EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo, |
| 998 | int scan_number)); |
| 999 | EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo)); |
| 1000 | EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo)); |
| 1001 | EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo)); |
| 1002 | EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo)); |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 1003 | /* Return value is one of: */ |
| 1004 | /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */ |
| 1005 | #define JPEG_REACHED_SOS 1 /* Reached start of new scan */ |
| 1006 | #define JPEG_REACHED_EOI 2 /* Reached end of image */ |
| 1007 | #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */ |
| 1008 | #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */ |
| 1009 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1010 | /* Precalculate output dimensions for current decompression parameters. */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 1011 | EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1012 | |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 1013 | /* Control saving of COM and APPn markers into marker_list. */ |
| 1014 | EXTERN(void) jpeg_save_markers |
| 1015 | JPP((j_decompress_ptr cinfo, int marker_code, |
| 1016 | unsigned int length_limit)); |
| 1017 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1018 | /* Install a special processing method for COM or APPn markers. */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 1019 | EXTERN(void) jpeg_set_marker_processor |
| 1020 | JPP((j_decompress_ptr cinfo, int marker_code, |
| 1021 | jpeg_marker_parser_method routine)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1022 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 1023 | /* Read or write raw DCT coefficients --- useful for lossless transcoding. */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 1024 | EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo)); |
| 1025 | EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo, |
| 1026 | jvirt_barray_ptr * coef_arrays)); |
| 1027 | EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo, |
| 1028 | j_compress_ptr dstinfo)); |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 1029 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1030 | /* If you choose to abort compression or decompression before completing |
| 1031 | * jpeg_finish_(de)compress, then you need to clean up to release memory, |
| 1032 | * temporary files, etc. You can just call jpeg_destroy_(de)compress |
| 1033 | * if you're done with the JPEG object, but if you want to clean it up and |
| 1034 | * reuse it, call this: |
| 1035 | */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 1036 | EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo)); |
| 1037 | EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1038 | |
| 1039 | /* Generic versions of jpeg_abort and jpeg_destroy that work on either |
| 1040 | * flavor of JPEG object. These may be more convenient in some places. |
| 1041 | */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 1042 | EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo)); |
| 1043 | EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1044 | |
| 1045 | /* Default restart-marker-resync procedure for use by data source modules */ |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 1046 | EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, |
| 1047 | int desired)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1048 | |
| 1049 | |
| 1050 | /* These marker codes are exported since applications and data source modules |
| 1051 | * are likely to want to use them. |
| 1052 | */ |
| 1053 | |
| 1054 | #define JPEG_RST0 0xD0 /* RST0 marker code */ |
| 1055 | #define JPEG_EOI 0xD9 /* EOI marker code */ |
| 1056 | #define JPEG_APP0 0xE0 /* APP0 marker code */ |
| 1057 | #define JPEG_COM 0xFE /* COM marker code */ |
| 1058 | |
| 1059 | |
| 1060 | /* If we have a brain-damaged compiler that emits warnings (or worse, errors) |
| 1061 | * for structure definitions that are never filled in, keep it quiet by |
| 1062 | * supplying dummy definitions for the various substructures. |
| 1063 | */ |
| 1064 | |
| 1065 | #ifdef INCOMPLETE_TYPES_BROKEN |
| 1066 | #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */ |
| 1067 | struct jvirt_sarray_control { long dummy; }; |
| 1068 | struct jvirt_barray_control { long dummy; }; |
| 1069 | struct jpeg_comp_master { long dummy; }; |
| 1070 | struct jpeg_c_main_controller { long dummy; }; |
| 1071 | struct jpeg_c_prep_controller { long dummy; }; |
| 1072 | struct jpeg_c_coef_controller { long dummy; }; |
| 1073 | struct jpeg_marker_writer { long dummy; }; |
| 1074 | struct jpeg_color_converter { long dummy; }; |
| 1075 | struct jpeg_downsampler { long dummy; }; |
| 1076 | struct jpeg_forward_dct { long dummy; }; |
| 1077 | struct jpeg_entropy_encoder { long dummy; }; |
| 1078 | struct jpeg_decomp_master { long dummy; }; |
| 1079 | struct jpeg_d_main_controller { long dummy; }; |
| 1080 | struct jpeg_d_coef_controller { long dummy; }; |
| 1081 | struct jpeg_d_post_controller { long dummy; }; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 1082 | struct jpeg_input_controller { long dummy; }; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1083 | struct jpeg_marker_reader { long dummy; }; |
| 1084 | struct jpeg_entropy_decoder { long dummy; }; |
| 1085 | struct jpeg_inverse_dct { long dummy; }; |
| 1086 | struct jpeg_upsampler { long dummy; }; |
| 1087 | struct jpeg_color_deconverter { long dummy; }; |
| 1088 | struct jpeg_color_quantizer { long dummy; }; |
| 1089 | #endif /* JPEG_INTERNALS */ |
| 1090 | #endif /* INCOMPLETE_TYPES_BROKEN */ |
| 1091 | |
| 1092 | |
| 1093 | /* |
| 1094 | * The JPEG library modules define JPEG_INTERNALS before including this file. |
| 1095 | * The internal structure declarations are read only when that is true. |
| 1096 | * Applications using the library should not include jpegint.h, but may wish |
| 1097 | * to include jerror.h. |
| 1098 | */ |
| 1099 | |
| 1100 | #ifdef JPEG_INTERNALS |
| 1101 | #include "jpegint.h" /* fetch private declarations */ |
| 1102 | #include "jerror.h" /* fetch error codes too */ |
| 1103 | #endif |
Thomas G. Lane | 9ba2f5e | 1994-12-07 00:00:00 +0000 | [diff] [blame] | 1104 | |
| 1105 | #endif /* JPEGLIB_H */ |