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| 1 /* |
| 2 * jpeglib.h |
| 3 * |
| 4 * Copyright (C) 1991-1998, Thomas G. Lane. |
| 5 * Copyright (C) 2009, D. R. Commander. |
| 6 * This file is part of the Independent JPEG Group's software. |
| 7 * For conditions of distribution and use, see the accompanying README file. |
| 8 * |
| 9 * This file defines the application interface for the JPEG library. |
| 10 * Most applications using the library need only include this file, |
| 11 * and perhaps jerror.h if they want to know the exact error codes. |
| 12 */ |
| 13 |
| 14 #ifndef JPEGLIB_H |
| 15 #define JPEGLIB_H |
| 16 |
| 17 #ifdef __cplusplus |
| 18 extern "C" { |
| 19 #endif |
| 20 |
| 21 /* |
| 22 * First we include the configuration files that record how this |
| 23 * installation of the JPEG library is set up. jconfig.h can be |
| 24 * generated automatically for many systems. jmorecfg.h contains |
| 25 * manual configuration options that most people need not worry about. |
| 26 */ |
| 27 |
| 28 #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */ |
| 29 #include "jconfig.h" /* widely used configuration options */ |
| 30 #endif |
| 31 #include "jmorecfg.h" /* seldom changed options */ |
| 32 |
| 33 |
| 34 /* Version ID for the JPEG library. |
| 35 * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60". |
| 36 */ |
| 37 |
| 38 #define JPEG_LIB_VERSION 62 /* Version 6b */ |
| 39 |
| 40 |
| 41 /* Various constants determining the sizes of things. |
| 42 * All of these are specified by the JPEG standard, so don't change them |
| 43 * if you want to be compatible. |
| 44 */ |
| 45 |
| 46 #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */ |
| 47 #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */ |
| 48 #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */ |
| 49 #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */ |
| 50 #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */ |
| 51 #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */ |
| 52 #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */ |
| 53 /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard; |
| 54 * the PostScript DCT filter can emit files with many more than 10 blocks/MCU. |
| 55 * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU |
| 56 * to handle it. We even let you do this from the jconfig.h file. However, |
| 57 * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe |
| 58 * sometimes emits noncompliant files doesn't mean you should too. |
| 59 */ |
| 60 #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */ |
| 61 #ifndef D_MAX_BLOCKS_IN_MCU |
| 62 #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */ |
| 63 #endif |
| 64 |
| 65 |
| 66 /* Data structures for images (arrays of samples and of DCT coefficients). |
| 67 * On 80x86 machines, the image arrays are too big for near pointers, |
| 68 * but the pointer arrays can fit in near memory. |
| 69 */ |
| 70 |
| 71 typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */ |
| 72 typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */ |
| 73 typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */ |
| 74 |
| 75 typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */ |
| 76 typedef JBLOCK FAR *JBLOCKROW; /* pointer to one row of coefficient blocks */ |
| 77 typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ |
| 78 typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */ |
| 79 |
| 80 typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */ |
| 81 |
| 82 |
| 83 /* Types for JPEG compression parameters and working tables. */ |
| 84 |
| 85 |
| 86 /* DCT coefficient quantization tables. */ |
| 87 |
| 88 typedef struct { |
| 89 /* This array gives the coefficient quantizers in natural array order |
| 90 * (not the zigzag order in which they are stored in a JPEG DQT marker). |
| 91 * CAUTION: IJG versions prior to v6a kept this array in zigzag order. |
| 92 */ |
| 93 UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */ |
| 94 /* This field is used only during compression. It's initialized FALSE when |
| 95 * the table is created, and set TRUE when it's been output to the file. |
| 96 * You could suppress output of a table by setting this to TRUE. |
| 97 * (See jpeg_suppress_tables for an example.) |
| 98 */ |
| 99 boolean sent_table; /* TRUE when table has been output */ |
| 100 } JQUANT_TBL; |
| 101 |
| 102 |
| 103 /* Huffman coding tables. */ |
| 104 |
| 105 typedef struct { |
| 106 /* These two fields directly represent the contents of a JPEG DHT marker */ |
| 107 UINT8 bits[17]; /* bits[k] = # of symbols with codes of */ |
| 108 /* length k bits; bits[0] is unused */ |
| 109 UINT8 huffval[256]; /* The symbols, in order of incr code length */ |
| 110 /* This field is used only during compression. It's initialized FALSE when |
| 111 * the table is created, and set TRUE when it's been output to the file. |
| 112 * You could suppress output of a table by setting this to TRUE. |
| 113 * (See jpeg_suppress_tables for an example.) |
| 114 */ |
| 115 boolean sent_table; /* TRUE when table has been output */ |
| 116 } JHUFF_TBL; |
| 117 |
| 118 |
| 119 /* Basic info about one component (color channel). */ |
| 120 |
| 121 typedef struct { |
| 122 /* These values are fixed over the whole image. */ |
| 123 /* For compression, they must be supplied by parameter setup; */ |
| 124 /* for decompression, they are read from the SOF marker. */ |
| 125 int component_id; /* identifier for this component (0..255) */ |
| 126 int component_index; /* its index in SOF or cinfo->comp_info[] */ |
| 127 int h_samp_factor; /* horizontal sampling factor (1..4) */ |
| 128 int v_samp_factor; /* vertical sampling factor (1..4) */ |
| 129 int quant_tbl_no; /* quantization table selector (0..3) */ |
| 130 /* These values may vary between scans. */ |
| 131 /* For compression, they must be supplied by parameter setup; */ |
| 132 /* for decompression, they are read from the SOS marker. */ |
| 133 /* The decompressor output side may not use these variables. */ |
| 134 int dc_tbl_no; /* DC entropy table selector (0..3) */ |
| 135 int ac_tbl_no; /* AC entropy table selector (0..3) */ |
| 136 |
| 137 /* Remaining fields should be treated as private by applications. */ |
| 138 |
| 139 /* These values are computed during compression or decompression startup: */ |
| 140 /* Component's size in DCT blocks. |
| 141 * Any dummy blocks added to complete an MCU are not counted; therefore |
| 142 * these values do not depend on whether a scan is interleaved or not. |
| 143 */ |
| 144 JDIMENSION width_in_blocks; |
| 145 JDIMENSION height_in_blocks; |
| 146 /* Size of a DCT block in samples. Always DCTSIZE for compression. |
| 147 * For decompression this is the size of the output from one DCT block, |
| 148 * reflecting any scaling we choose to apply during the IDCT step. |
| 149 * Values of 1,2,4,8 are likely to be supported. Note that different |
| 150 * components may receive different IDCT scalings. |
| 151 */ |
| 152 int DCT_scaled_size; |
| 153 /* The downsampled dimensions are the component's actual, unpadded number |
| 154 * of samples at the main buffer (preprocessing/compression interface), thus |
| 155 * downsampled_width = ceil(image_width * Hi/Hmax) |
| 156 * and similarly for height. For decompression, IDCT scaling is included, so |
| 157 * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE) |
| 158 */ |
| 159 JDIMENSION downsampled_width; /* actual width in samples */ |
| 160 JDIMENSION downsampled_height; /* actual height in samples */ |
| 161 /* This flag is used only for decompression. In cases where some of the |
| 162 * components will be ignored (eg grayscale output from YCbCr image), |
| 163 * we can skip most computations for the unused components. |
| 164 */ |
| 165 boolean component_needed; /* do we need the value of this component? */ |
| 166 |
| 167 /* These values are computed before starting a scan of the component. */ |
| 168 /* The decompressor output side may not use these variables. */ |
| 169 int MCU_width; /* number of blocks per MCU, horizontally */ |
| 170 int MCU_height; /* number of blocks per MCU, vertically */ |
| 171 int MCU_blocks; /* MCU_width * MCU_height */ |
| 172 int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_si
ze */ |
| 173 int last_col_width; /* # of non-dummy blocks across in last MCU */ |
| 174 int last_row_height; /* # of non-dummy blocks down in last MCU */ |
| 175 |
| 176 /* Saved quantization table for component; NULL if none yet saved. |
| 177 * See jdinput.c comments about the need for this information. |
| 178 * This field is currently used only for decompression. |
| 179 */ |
| 180 JQUANT_TBL * quant_table; |
| 181 |
| 182 /* Private per-component storage for DCT or IDCT subsystem. */ |
| 183 void * dct_table; |
| 184 } jpeg_component_info; |
| 185 |
| 186 |
| 187 /* The script for encoding a multiple-scan file is an array of these: */ |
| 188 |
| 189 typedef struct { |
| 190 int comps_in_scan; /* number of components encoded in this scan */ |
| 191 int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */ |
| 192 int Ss, Se; /* progressive JPEG spectral selection parms */ |
| 193 int Ah, Al; /* progressive JPEG successive approx. parms */ |
| 194 } jpeg_scan_info; |
| 195 |
| 196 /* The decompressor can save APPn and COM markers in a list of these: */ |
| 197 |
| 198 typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr; |
| 199 |
| 200 struct jpeg_marker_struct { |
| 201 jpeg_saved_marker_ptr next; /* next in list, or NULL */ |
| 202 UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */ |
| 203 unsigned int original_length; /* # bytes of data in the file */ |
| 204 unsigned int data_length; /* # bytes of data saved at data[] */ |
| 205 JOCTET FAR * data; /* the data contained in the marker */ |
| 206 /* the marker length word is not counted in data_length or original_length */ |
| 207 }; |
| 208 |
| 209 /* Known color spaces. */ |
| 210 |
| 211 #define JCS_EXTENSIONS 1 |
| 212 |
| 213 typedef enum { |
| 214 JCS_UNKNOWN, /* error/unspecified */ |
| 215 JCS_GRAYSCALE, /* monochrome */ |
| 216 JCS_RGB, /* red/green/blue as specified by the RGB_RED, R
GB_GREEN, |
| 217 RGB_BLUE, and RGB_PIXELSIZE macros */ |
| 218 JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */ |
| 219 JCS_CMYK, /* C/M/Y/K */ |
| 220 JCS_YCCK, /* Y/Cb/Cr/K */ |
| 221 JCS_EXT_RGB, /* red/green/blue */ |
| 222 JCS_EXT_RGBX, /* red/green/blue/x */ |
| 223 JCS_EXT_BGR, /* blue/green/red */ |
| 224 JCS_EXT_BGRX, /* blue/green/red/x */ |
| 225 JCS_EXT_XBGR, /* x/blue/green/red */ |
| 226 JCS_EXT_XRGB /* x/red/green/blue */ |
| 227 } J_COLOR_SPACE; |
| 228 |
| 229 /* DCT/IDCT algorithm options. */ |
| 230 |
| 231 typedef enum { |
| 232 JDCT_ISLOW, /* slow but accurate integer algorithm */ |
| 233 JDCT_IFAST, /* faster, less accurate integer method */ |
| 234 JDCT_FLOAT /* floating-point: accurate, fast on fast HW */ |
| 235 } J_DCT_METHOD; |
| 236 |
| 237 #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */ |
| 238 #define JDCT_DEFAULT JDCT_ISLOW |
| 239 #endif |
| 240 #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */ |
| 241 #define JDCT_FASTEST JDCT_IFAST |
| 242 #endif |
| 243 |
| 244 /* Dithering options for decompression. */ |
| 245 |
| 246 typedef enum { |
| 247 JDITHER_NONE, /* no dithering */ |
| 248 JDITHER_ORDERED, /* simple ordered dither */ |
| 249 JDITHER_FS /* Floyd-Steinberg error diffusion dither */ |
| 250 } J_DITHER_MODE; |
| 251 |
| 252 |
| 253 /* Common fields between JPEG compression and decompression master structs. */ |
| 254 |
| 255 #define jpeg_common_fields \ |
| 256 struct jpeg_error_mgr * err; /* Error handler module */\ |
| 257 struct jpeg_memory_mgr * mem; /* Memory manager module */\ |
| 258 struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\ |
| 259 void * client_data; /* Available for use by application */\ |
| 260 boolean is_decompressor; /* So common code can tell which is which */\ |
| 261 int global_state /* For checking call sequence validity */ |
| 262 |
| 263 /* Routines that are to be used by both halves of the library are declared |
| 264 * to receive a pointer to this structure. There are no actual instances of |
| 265 * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct. |
| 266 */ |
| 267 struct jpeg_common_struct { |
| 268 jpeg_common_fields; /* Fields common to both master struct types */ |
| 269 /* Additional fields follow in an actual jpeg_compress_struct or |
| 270 * jpeg_decompress_struct. All three structs must agree on these |
| 271 * initial fields! (This would be a lot cleaner in C++.) |
| 272 */ |
| 273 }; |
| 274 |
| 275 typedef struct jpeg_common_struct * j_common_ptr; |
| 276 typedef struct jpeg_compress_struct * j_compress_ptr; |
| 277 typedef struct jpeg_decompress_struct * j_decompress_ptr; |
| 278 |
| 279 |
| 280 /* Master record for a compression instance */ |
| 281 |
| 282 struct jpeg_compress_struct { |
| 283 jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */ |
| 284 |
| 285 /* Destination for compressed data */ |
| 286 struct jpeg_destination_mgr * dest; |
| 287 |
| 288 /* Description of source image --- these fields must be filled in by |
| 289 * outer application before starting compression. in_color_space must |
| 290 * be correct before you can even call jpeg_set_defaults(). |
| 291 */ |
| 292 |
| 293 JDIMENSION image_width; /* input image width */ |
| 294 JDIMENSION image_height; /* input image height */ |
| 295 int input_components; /* # of color components in input image */ |
| 296 J_COLOR_SPACE in_color_space; /* colorspace of input image */ |
| 297 |
| 298 double input_gamma; /* image gamma of input image */ |
| 299 |
| 300 /* Compression parameters --- these fields must be set before calling |
| 301 * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to |
| 302 * initialize everything to reasonable defaults, then changing anything |
| 303 * the application specifically wants to change. That way you won't get |
| 304 * burnt when new parameters are added. Also note that there are several |
| 305 * helper routines to simplify changing parameters. |
| 306 */ |
| 307 |
| 308 int data_precision; /* bits of precision in image data */ |
| 309 |
| 310 int num_components; /* # of color components in JPEG image */ |
| 311 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ |
| 312 |
| 313 jpeg_component_info * comp_info; |
| 314 /* comp_info[i] describes component that appears i'th in SOF */ |
| 315 |
| 316 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; |
| 317 /* ptrs to coefficient quantization tables, or NULL if not defined */ |
| 318 |
| 319 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| 320 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| 321 /* ptrs to Huffman coding tables, or NULL if not defined */ |
| 322 |
| 323 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ |
| 324 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ |
| 325 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ |
| 326 |
| 327 int num_scans; /* # of entries in scan_info array */ |
| 328 const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */ |
| 329 /* The default value of scan_info is NULL, which causes a single-scan |
| 330 * sequential JPEG file to be emitted. To create a multi-scan file, |
| 331 * set num_scans and scan_info to point to an array of scan definitions. |
| 332 */ |
| 333 |
| 334 boolean raw_data_in; /* TRUE=caller supplies downsampled data */ |
| 335 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ |
| 336 boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ |
| 337 boolean CCIR601_sampling; /* TRUE=first samples are cosited */ |
| 338 int smoothing_factor; /* 1..100, or 0 for no input smoothing */ |
| 339 J_DCT_METHOD dct_method; /* DCT algorithm selector */ |
| 340 |
| 341 /* The restart interval can be specified in absolute MCUs by setting |
| 342 * restart_interval, or in MCU rows by setting restart_in_rows |
| 343 * (in which case the correct restart_interval will be figured |
| 344 * for each scan). |
| 345 */ |
| 346 unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */ |
| 347 int restart_in_rows; /* if > 0, MCU rows per restart interval */ |
| 348 |
| 349 /* Parameters controlling emission of special markers. */ |
| 350 |
| 351 boolean write_JFIF_header; /* should a JFIF marker be written? */ |
| 352 UINT8 JFIF_major_version; /* What to write for the JFIF version number */ |
| 353 UINT8 JFIF_minor_version; |
| 354 /* These three values are not used by the JPEG code, merely copied */ |
| 355 /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */ |
| 356 /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */ |
| 357 /* ratio is defined by X_density/Y_density even when density_unit=0. */ |
| 358 UINT8 density_unit; /* JFIF code for pixel size units */ |
| 359 UINT16 X_density; /* Horizontal pixel density */ |
| 360 UINT16 Y_density; /* Vertical pixel density */ |
| 361 boolean write_Adobe_marker; /* should an Adobe marker be written? */ |
| 362 |
| 363 /* State variable: index of next scanline to be written to |
| 364 * jpeg_write_scanlines(). Application may use this to control its |
| 365 * processing loop, e.g., "while (next_scanline < image_height)". |
| 366 */ |
| 367 |
| 368 JDIMENSION next_scanline; /* 0 .. image_height-1 */ |
| 369 |
| 370 /* Remaining fields are known throughout compressor, but generally |
| 371 * should not be touched by a surrounding application. |
| 372 */ |
| 373 |
| 374 /* |
| 375 * These fields are computed during compression startup |
| 376 */ |
| 377 boolean progressive_mode; /* TRUE if scan script uses progressive mode */ |
| 378 int max_h_samp_factor; /* largest h_samp_factor */ |
| 379 int max_v_samp_factor; /* largest v_samp_factor */ |
| 380 |
| 381 JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */ |
| 382 /* The coefficient controller receives data in units of MCU rows as defined |
| 383 * for fully interleaved scans (whether the JPEG file is interleaved or not). |
| 384 * There are v_samp_factor * DCTSIZE sample rows of each component in an |
| 385 * "iMCU" (interleaved MCU) row. |
| 386 */ |
| 387 |
| 388 /* |
| 389 * These fields are valid during any one scan. |
| 390 * They describe the components and MCUs actually appearing in the scan. |
| 391 */ |
| 392 int comps_in_scan; /* # of JPEG components in this scan */ |
| 393 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; |
| 394 /* *cur_comp_info[i] describes component that appears i'th in SOS */ |
| 395 |
| 396 JDIMENSION MCUs_per_row; /* # of MCUs across the image */ |
| 397 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ |
| 398 |
| 399 int blocks_in_MCU; /* # of DCT blocks per MCU */ |
| 400 int MCU_membership[C_MAX_BLOCKS_IN_MCU]; |
| 401 /* MCU_membership[i] is index in cur_comp_info of component owning */ |
| 402 /* i'th block in an MCU */ |
| 403 |
| 404 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ |
| 405 |
| 406 /* |
| 407 * Links to compression subobjects (methods and private variables of modules) |
| 408 */ |
| 409 struct jpeg_comp_master * master; |
| 410 struct jpeg_c_main_controller * main; |
| 411 struct jpeg_c_prep_controller * prep; |
| 412 struct jpeg_c_coef_controller * coef; |
| 413 struct jpeg_marker_writer * marker; |
| 414 struct jpeg_color_converter * cconvert; |
| 415 struct jpeg_downsampler * downsample; |
| 416 struct jpeg_forward_dct * fdct; |
| 417 struct jpeg_entropy_encoder * entropy; |
| 418 jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */ |
| 419 int script_space_size; |
| 420 }; |
| 421 |
| 422 |
| 423 /* Master record for a decompression instance */ |
| 424 |
| 425 struct jpeg_decompress_struct { |
| 426 jpeg_common_fields; /* Fields shared with jpeg_compress_struct */ |
| 427 |
| 428 /* Source of compressed data */ |
| 429 struct jpeg_source_mgr * src; |
| 430 |
| 431 /* Basic description of image --- filled in by jpeg_read_header(). */ |
| 432 /* Application may inspect these values to decide how to process image. */ |
| 433 |
| 434 JDIMENSION image_width; /* nominal image width (from SOF marker) */ |
| 435 JDIMENSION image_height; /* nominal image height */ |
| 436 int num_components; /* # of color components in JPEG image */ |
| 437 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ |
| 438 |
| 439 /* Decompression processing parameters --- these fields must be set before |
| 440 * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes |
| 441 * them to default values. |
| 442 */ |
| 443 |
| 444 J_COLOR_SPACE out_color_space; /* colorspace for output */ |
| 445 |
| 446 unsigned int scale_num, scale_denom; /* fraction by which to scale image */ |
| 447 |
| 448 double output_gamma; /* image gamma wanted in output */ |
| 449 |
| 450 boolean buffered_image; /* TRUE=multiple output passes */ |
| 451 boolean raw_data_out; /* TRUE=downsampled data wanted */ |
| 452 |
| 453 J_DCT_METHOD dct_method; /* IDCT algorithm selector */ |
| 454 boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */ |
| 455 boolean do_block_smoothing; /* TRUE=apply interblock smoothing */ |
| 456 |
| 457 boolean quantize_colors; /* TRUE=colormapped output wanted */ |
| 458 /* the following are ignored if not quantize_colors: */ |
| 459 J_DITHER_MODE dither_mode; /* type of color dithering to use */ |
| 460 boolean two_pass_quantize; /* TRUE=use two-pass color quantization */ |
| 461 int desired_number_of_colors; /* max # colors to use in created colormap */ |
| 462 /* these are significant only in buffered-image mode: */ |
| 463 boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ |
| 464 boolean enable_external_quant;/* enable future use of external colormap */ |
| 465 boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ |
| 466 |
| 467 /* Description of actual output image that will be returned to application. |
| 468 * These fields are computed by jpeg_start_decompress(). |
| 469 * You can also use jpeg_calc_output_dimensions() to determine these values |
| 470 * in advance of calling jpeg_start_decompress(). |
| 471 */ |
| 472 |
| 473 JDIMENSION output_width; /* scaled image width */ |
| 474 JDIMENSION output_height; /* scaled image height */ |
| 475 int out_color_components; /* # of color components in out_color_space */ |
| 476 int output_components; /* # of color components returned */ |
| 477 /* output_components is 1 (a colormap index) when quantizing colors; |
| 478 * otherwise it equals out_color_components. |
| 479 */ |
| 480 int rec_outbuf_height; /* min recommended height of scanline buffer */ |
| 481 /* If the buffer passed to jpeg_read_scanlines() is less than this many rows |
| 482 * high, space and time will be wasted due to unnecessary data copying. |
| 483 * Usually rec_outbuf_height will be 1 or 2, at most 4. |
| 484 */ |
| 485 |
| 486 /* When quantizing colors, the output colormap is described by these fields. |
| 487 * The application can supply a colormap by setting colormap non-NULL before |
| 488 * calling jpeg_start_decompress; otherwise a colormap is created during |
| 489 * jpeg_start_decompress or jpeg_start_output. |
| 490 * The map has out_color_components rows and actual_number_of_colors columns. |
| 491 */ |
| 492 int actual_number_of_colors; /* number of entries in use */ |
| 493 JSAMPARRAY colormap; /* The color map as a 2-D pixel array */ |
| 494 |
| 495 /* State variables: these variables indicate the progress of decompression. |
| 496 * The application may examine these but must not modify them. |
| 497 */ |
| 498 |
| 499 /* Row index of next scanline to be read from jpeg_read_scanlines(). |
| 500 * Application may use this to control its processing loop, e.g., |
| 501 * "while (output_scanline < output_height)". |
| 502 */ |
| 503 JDIMENSION output_scanline; /* 0 .. output_height-1 */ |
| 504 |
| 505 /* Current input scan number and number of iMCU rows completed in scan. |
| 506 * These indicate the progress of the decompressor input side. |
| 507 */ |
| 508 int input_scan_number; /* Number of SOS markers seen so far */ |
| 509 JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */ |
| 510 |
| 511 /* The "output scan number" is the notional scan being displayed by the |
| 512 * output side. The decompressor will not allow output scan/row number |
| 513 * to get ahead of input scan/row, but it can fall arbitrarily far behind. |
| 514 */ |
| 515 int output_scan_number; /* Nominal scan number being displayed */ |
| 516 JDIMENSION output_iMCU_row; /* Number of iMCU rows read */ |
| 517 |
| 518 /* Current progression status. coef_bits[c][i] indicates the precision |
| 519 * with which component c's DCT coefficient i (in zigzag order) is known. |
| 520 * It is -1 when no data has yet been received, otherwise it is the point |
| 521 * transform (shift) value for the most recent scan of the coefficient |
| 522 * (thus, 0 at completion of the progression). |
| 523 * This pointer is NULL when reading a non-progressive file. |
| 524 */ |
| 525 int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */ |
| 526 |
| 527 /* Internal JPEG parameters --- the application usually need not look at |
| 528 * these fields. Note that the decompressor output side may not use |
| 529 * any parameters that can change between scans. |
| 530 */ |
| 531 |
| 532 /* Quantization and Huffman tables are carried forward across input |
| 533 * datastreams when processing abbreviated JPEG datastreams. |
| 534 */ |
| 535 |
| 536 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; |
| 537 /* ptrs to coefficient quantization tables, or NULL if not defined */ |
| 538 |
| 539 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| 540 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; |
| 541 /* ptrs to Huffman coding tables, or NULL if not defined */ |
| 542 |
| 543 /* These parameters are never carried across datastreams, since they |
| 544 * are given in SOF/SOS markers or defined to be reset by SOI. |
| 545 */ |
| 546 |
| 547 int data_precision; /* bits of precision in image data */ |
| 548 |
| 549 jpeg_component_info * comp_info; |
| 550 /* comp_info[i] describes component that appears i'th in SOF */ |
| 551 |
| 552 boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */ |
| 553 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ |
| 554 |
| 555 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ |
| 556 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ |
| 557 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ |
| 558 |
| 559 unsigned int restart_interval; /* MCUs per restart interval, or 0 for no resta
rt */ |
| 560 |
| 561 /* These fields record data obtained from optional markers recognized by |
| 562 * the JPEG library. |
| 563 */ |
| 564 boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */ |
| 565 /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */ |
| 566 UINT8 JFIF_major_version; /* JFIF version number */ |
| 567 UINT8 JFIF_minor_version; |
| 568 UINT8 density_unit; /* JFIF code for pixel size units */ |
| 569 UINT16 X_density; /* Horizontal pixel density */ |
| 570 UINT16 Y_density; /* Vertical pixel density */ |
| 571 boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */ |
| 572 UINT8 Adobe_transform; /* Color transform code from Adobe marker */ |
| 573 |
| 574 boolean CCIR601_sampling; /* TRUE=first samples are cosited */ |
| 575 |
| 576 /* Aside from the specific data retained from APPn markers known to the |
| 577 * library, the uninterpreted contents of any or all APPn and COM markers |
| 578 * can be saved in a list for examination by the application. |
| 579 */ |
| 580 jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */ |
| 581 |
| 582 /* Remaining fields are known throughout decompressor, but generally |
| 583 * should not be touched by a surrounding application. |
| 584 */ |
| 585 |
| 586 /* |
| 587 * These fields are computed during decompression startup |
| 588 */ |
| 589 int max_h_samp_factor; /* largest h_samp_factor */ |
| 590 int max_v_samp_factor; /* largest v_samp_factor */ |
| 591 |
| 592 int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */ |
| 593 |
| 594 JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */ |
| 595 /* The coefficient controller's input and output progress is measured in |
| 596 * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows |
| 597 * in fully interleaved JPEG scans, but are used whether the scan is |
| 598 * interleaved or not. We define an iMCU row as v_samp_factor DCT block |
| 599 * rows of each component. Therefore, the IDCT output contains |
| 600 * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row. |
| 601 */ |
| 602 |
| 603 JSAMPLE * sample_range_limit; /* table for fast range-limiting */ |
| 604 |
| 605 /* |
| 606 * These fields are valid during any one scan. |
| 607 * They describe the components and MCUs actually appearing in the scan. |
| 608 * Note that the decompressor output side must not use these fields. |
| 609 */ |
| 610 int comps_in_scan; /* # of JPEG components in this scan */ |
| 611 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; |
| 612 /* *cur_comp_info[i] describes component that appears i'th in SOS */ |
| 613 |
| 614 JDIMENSION MCUs_per_row; /* # of MCUs across the image */ |
| 615 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ |
| 616 |
| 617 int blocks_in_MCU; /* # of DCT blocks per MCU */ |
| 618 int MCU_membership[D_MAX_BLOCKS_IN_MCU]; |
| 619 /* MCU_membership[i] is index in cur_comp_info of component owning */ |
| 620 /* i'th block in an MCU */ |
| 621 |
| 622 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ |
| 623 |
| 624 /* This field is shared between entropy decoder and marker parser. |
| 625 * It is either zero or the code of a JPEG marker that has been |
| 626 * read from the data source, but has not yet been processed. |
| 627 */ |
| 628 int unread_marker; |
| 629 |
| 630 /* |
| 631 * Links to decompression subobjects (methods, private variables of modules) |
| 632 */ |
| 633 struct jpeg_decomp_master * master; |
| 634 struct jpeg_d_main_controller * main; |
| 635 struct jpeg_d_coef_controller * coef; |
| 636 struct jpeg_d_post_controller * post; |
| 637 struct jpeg_input_controller * inputctl; |
| 638 struct jpeg_marker_reader * marker; |
| 639 struct jpeg_entropy_decoder * entropy; |
| 640 struct jpeg_inverse_dct * idct; |
| 641 struct jpeg_upsampler * upsample; |
| 642 struct jpeg_color_deconverter * cconvert; |
| 643 struct jpeg_color_quantizer * cquantize; |
| 644 }; |
| 645 |
| 646 |
| 647 /* "Object" declarations for JPEG modules that may be supplied or called |
| 648 * directly by the surrounding application. |
| 649 * As with all objects in the JPEG library, these structs only define the |
| 650 * publicly visible methods and state variables of a module. Additional |
| 651 * private fields may exist after the public ones. |
| 652 */ |
| 653 |
| 654 |
| 655 /* Error handler object */ |
| 656 |
| 657 struct jpeg_error_mgr { |
| 658 /* Error exit handler: does not return to caller */ |
| 659 JMETHOD(void, error_exit, (j_common_ptr cinfo)); |
| 660 /* Conditionally emit a trace or warning message */ |
| 661 JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level)); |
| 662 /* Routine that actually outputs a trace or error message */ |
| 663 JMETHOD(void, output_message, (j_common_ptr cinfo)); |
| 664 /* Format a message string for the most recent JPEG error or message */ |
| 665 JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer)); |
| 666 #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */ |
| 667 /* Reset error state variables at start of a new image */ |
| 668 JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo)); |
| 669 |
| 670 /* The message ID code and any parameters are saved here. |
| 671 * A message can have one string parameter or up to 8 int parameters. |
| 672 */ |
| 673 int msg_code; |
| 674 #define JMSG_STR_PARM_MAX 80 |
| 675 union { |
| 676 int i[8]; |
| 677 char s[JMSG_STR_PARM_MAX]; |
| 678 } msg_parm; |
| 679 |
| 680 /* Standard state variables for error facility */ |
| 681 |
| 682 int trace_level; /* max msg_level that will be displayed */ |
| 683 |
| 684 /* For recoverable corrupt-data errors, we emit a warning message, |
| 685 * but keep going unless emit_message chooses to abort. emit_message |
| 686 * should count warnings in num_warnings. The surrounding application |
| 687 * can check for bad data by seeing if num_warnings is nonzero at the |
| 688 * end of processing. |
| 689 */ |
| 690 long num_warnings; /* number of corrupt-data warnings */ |
| 691 |
| 692 /* These fields point to the table(s) of error message strings. |
| 693 * An application can change the table pointer to switch to a different |
| 694 * message list (typically, to change the language in which errors are |
| 695 * reported). Some applications may wish to add additional error codes |
| 696 * that will be handled by the JPEG library error mechanism; the second |
| 697 * table pointer is used for this purpose. |
| 698 * |
| 699 * First table includes all errors generated by JPEG library itself. |
| 700 * Error code 0 is reserved for a "no such error string" message. |
| 701 */ |
| 702 const char * const * jpeg_message_table; /* Library errors */ |
| 703 int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */ |
| 704 /* Second table can be added by application (see cjpeg/djpeg for example). |
| 705 * It contains strings numbered first_addon_message..last_addon_message. |
| 706 */ |
| 707 const char * const * addon_message_table; /* Non-library errors */ |
| 708 int first_addon_message; /* code for first string in addon table */ |
| 709 int last_addon_message; /* code for last string in addon table */ |
| 710 }; |
| 711 |
| 712 |
| 713 /* Progress monitor object */ |
| 714 |
| 715 struct jpeg_progress_mgr { |
| 716 JMETHOD(void, progress_monitor, (j_common_ptr cinfo)); |
| 717 |
| 718 long pass_counter; /* work units completed in this pass */ |
| 719 long pass_limit; /* total number of work units in this pass */ |
| 720 int completed_passes; /* passes completed so far */ |
| 721 int total_passes; /* total number of passes expected */ |
| 722 }; |
| 723 |
| 724 |
| 725 /* Data destination object for compression */ |
| 726 |
| 727 struct jpeg_destination_mgr { |
| 728 JOCTET * next_output_byte; /* => next byte to write in buffer */ |
| 729 size_t free_in_buffer; /* # of byte spaces remaining in buffer */ |
| 730 |
| 731 JMETHOD(void, init_destination, (j_compress_ptr cinfo)); |
| 732 JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo)); |
| 733 JMETHOD(void, term_destination, (j_compress_ptr cinfo)); |
| 734 }; |
| 735 |
| 736 |
| 737 /* Data source object for decompression */ |
| 738 |
| 739 struct jpeg_source_mgr { |
| 740 const JOCTET * next_input_byte; /* => next byte to read from buffer */ |
| 741 size_t bytes_in_buffer; /* # of bytes remaining in buffer */ |
| 742 |
| 743 JMETHOD(void, init_source, (j_decompress_ptr cinfo)); |
| 744 JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo)); |
| 745 JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes)); |
| 746 JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired)); |
| 747 JMETHOD(void, term_source, (j_decompress_ptr cinfo)); |
| 748 }; |
| 749 |
| 750 |
| 751 /* Memory manager object. |
| 752 * Allocates "small" objects (a few K total), "large" objects (tens of K), |
| 753 * and "really big" objects (virtual arrays with backing store if needed). |
| 754 * The memory manager does not allow individual objects to be freed; rather, |
| 755 * each created object is assigned to a pool, and whole pools can be freed |
| 756 * at once. This is faster and more convenient than remembering exactly what |
| 757 * to free, especially where malloc()/free() are not too speedy. |
| 758 * NB: alloc routines never return NULL. They exit to error_exit if not |
| 759 * successful. |
| 760 */ |
| 761 |
| 762 #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */ |
| 763 #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */ |
| 764 #define JPOOL_NUMPOOLS 2 |
| 765 |
| 766 typedef struct jvirt_sarray_control * jvirt_sarray_ptr; |
| 767 typedef struct jvirt_barray_control * jvirt_barray_ptr; |
| 768 |
| 769 |
| 770 struct jpeg_memory_mgr { |
| 771 /* Method pointers */ |
| 772 JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id, |
| 773 size_t sizeofobject)); |
| 774 JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id, |
| 775 size_t sizeofobject)); |
| 776 JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id, |
| 777 JDIMENSION samplesperrow, |
| 778 JDIMENSION numrows)); |
| 779 JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id, |
| 780 JDIMENSION blocksperrow, |
| 781 JDIMENSION numrows)); |
| 782 JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo, |
| 783 int pool_id, |
| 784 boolean pre_zero, |
| 785 JDIMENSION samplesperrow, |
| 786 JDIMENSION numrows, |
| 787 JDIMENSION maxaccess)); |
| 788 JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo, |
| 789 int pool_id, |
| 790 boolean pre_zero, |
| 791 JDIMENSION blocksperrow, |
| 792 JDIMENSION numrows, |
| 793 JDIMENSION maxaccess)); |
| 794 JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo)); |
| 795 JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo, |
| 796 jvirt_sarray_ptr ptr, |
| 797 JDIMENSION start_row, |
| 798 JDIMENSION num_rows, |
| 799 boolean writable)); |
| 800 JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo, |
| 801 jvirt_barray_ptr ptr, |
| 802 JDIMENSION start_row, |
| 803 JDIMENSION num_rows, |
| 804 boolean writable)); |
| 805 JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id)); |
| 806 JMETHOD(void, self_destruct, (j_common_ptr cinfo)); |
| 807 |
| 808 /* Limit on memory allocation for this JPEG object. (Note that this is |
| 809 * merely advisory, not a guaranteed maximum; it only affects the space |
| 810 * used for virtual-array buffers.) May be changed by outer application |
| 811 * after creating the JPEG object. |
| 812 */ |
| 813 long max_memory_to_use; |
| 814 |
| 815 /* Maximum allocation request accepted by alloc_large. */ |
| 816 long max_alloc_chunk; |
| 817 }; |
| 818 |
| 819 |
| 820 /* Routine signature for application-supplied marker processing methods. |
| 821 * Need not pass marker code since it is stored in cinfo->unread_marker. |
| 822 */ |
| 823 typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo)); |
| 824 |
| 825 |
| 826 /* Declarations for routines called by application. |
| 827 * The JPP macro hides prototype parameters from compilers that can't cope. |
| 828 * Note JPP requires double parentheses. |
| 829 */ |
| 830 |
| 831 #ifdef HAVE_PROTOTYPES |
| 832 #define JPP(arglist) arglist |
| 833 #else |
| 834 #define JPP(arglist) () |
| 835 #endif |
| 836 |
| 837 |
| 838 /* Short forms of external names for systems with brain-damaged linkers. |
| 839 * We shorten external names to be unique in the first six letters, which |
| 840 * is good enough for all known systems. |
| 841 * (If your compiler itself needs names to be unique in less than 15 |
| 842 * characters, you are out of luck. Get a better compiler.) |
| 843 */ |
| 844 |
| 845 #ifdef NEED_SHORT_EXTERNAL_NAMES |
| 846 #define jpeg_std_error jStdError |
| 847 #define jpeg_CreateCompress jCreaCompress |
| 848 #define jpeg_CreateDecompress jCreaDecompress |
| 849 #define jpeg_destroy_compress jDestCompress |
| 850 #define jpeg_destroy_decompress jDestDecompress |
| 851 #define jpeg_stdio_dest jStdDest |
| 852 #define jpeg_stdio_src jStdSrc |
| 853 #define jpeg_set_defaults jSetDefaults |
| 854 #define jpeg_set_colorspace jSetColorspace |
| 855 #define jpeg_default_colorspace jDefColorspace |
| 856 #define jpeg_set_quality jSetQuality |
| 857 #define jpeg_set_linear_quality jSetLQuality |
| 858 #define jpeg_add_quant_table jAddQuantTable |
| 859 #define jpeg_quality_scaling jQualityScaling |
| 860 #define jpeg_simple_progression jSimProgress |
| 861 #define jpeg_suppress_tables jSuppressTables |
| 862 #define jpeg_alloc_quant_table jAlcQTable |
| 863 #define jpeg_alloc_huff_table jAlcHTable |
| 864 #define jpeg_start_compress jStrtCompress |
| 865 #define jpeg_write_scanlines jWrtScanlines |
| 866 #define jpeg_finish_compress jFinCompress |
| 867 #define jpeg_write_raw_data jWrtRawData |
| 868 #define jpeg_write_marker jWrtMarker |
| 869 #define jpeg_write_m_header jWrtMHeader |
| 870 #define jpeg_write_m_byte jWrtMByte |
| 871 #define jpeg_write_tables jWrtTables |
| 872 #define jpeg_read_header jReadHeader |
| 873 #define jpeg_start_decompress jStrtDecompress |
| 874 #define jpeg_read_scanlines jReadScanlines |
| 875 #define jpeg_finish_decompress jFinDecompress |
| 876 #define jpeg_read_raw_data jReadRawData |
| 877 #define jpeg_has_multiple_scans jHasMultScn |
| 878 #define jpeg_start_output jStrtOutput |
| 879 #define jpeg_finish_output jFinOutput |
| 880 #define jpeg_input_complete jInComplete |
| 881 #define jpeg_new_colormap jNewCMap |
| 882 #define jpeg_consume_input jConsumeInput |
| 883 #define jpeg_calc_output_dimensions jCalcDimensions |
| 884 #define jpeg_save_markers jSaveMarkers |
| 885 #define jpeg_set_marker_processor jSetMarker |
| 886 #define jpeg_read_coefficients jReadCoefs |
| 887 #define jpeg_write_coefficients jWrtCoefs |
| 888 #define jpeg_copy_critical_parameters jCopyCrit |
| 889 #define jpeg_abort_compress jAbrtCompress |
| 890 #define jpeg_abort_decompress jAbrtDecompress |
| 891 #define jpeg_abort jAbort |
| 892 #define jpeg_destroy jDestroy |
| 893 #define jpeg_resync_to_restart jResyncRestart |
| 894 #endif /* NEED_SHORT_EXTERNAL_NAMES */ |
| 895 |
| 896 |
| 897 /* Default error-management setup */ |
| 898 EXTERN(struct jpeg_error_mgr *) jpeg_std_error |
| 899 JPP((struct jpeg_error_mgr * err)); |
| 900 |
| 901 /* Initialization of JPEG compression objects. |
| 902 * jpeg_create_compress() and jpeg_create_decompress() are the exported |
| 903 * names that applications should call. These expand to calls on |
| 904 * jpeg_CreateCompress and jpeg_CreateDecompress with additional information |
| 905 * passed for version mismatch checking. |
| 906 * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx. |
| 907 */ |
| 908 #define jpeg_create_compress(cinfo) \ |
| 909 jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \ |
| 910 (size_t) sizeof(struct jpeg_compress_struct)) |
| 911 #define jpeg_create_decompress(cinfo) \ |
| 912 jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \ |
| 913 (size_t) sizeof(struct jpeg_decompress_struct)) |
| 914 EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo, |
| 915 int version, size_t structsize)); |
| 916 EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo, |
| 917 int version, size_t structsize)); |
| 918 /* Destruction of JPEG compression objects */ |
| 919 EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo)); |
| 920 EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo)); |
| 921 |
| 922 /* Standard data source and destination managers: stdio streams. */ |
| 923 /* Caller is responsible for opening the file before and closing after. */ |
| 924 EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile)); |
| 925 EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile)); |
| 926 |
| 927 /* Default parameter setup for compression */ |
| 928 EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo)); |
| 929 /* Compression parameter setup aids */ |
| 930 EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo, |
| 931 J_COLOR_SPACE colorspace)); |
| 932 EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo)); |
| 933 EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality, |
| 934 boolean force_baseline)); |
| 935 EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo, |
| 936 int scale_factor, |
| 937 boolean force_baseline)); |
| 938 EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl, |
| 939 const unsigned int *basic_table, |
| 940 int scale_factor, |
| 941 boolean force_baseline)); |
| 942 EXTERN(int) jpeg_quality_scaling JPP((int quality)); |
| 943 EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo)); |
| 944 EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo, |
| 945 boolean suppress)); |
| 946 EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo)); |
| 947 EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo)); |
| 948 |
| 949 /* Main entry points for compression */ |
| 950 EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo, |
| 951 boolean write_all_tables)); |
| 952 EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo, |
| 953 JSAMPARRAY scanlines, |
| 954 JDIMENSION num_lines)); |
| 955 EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo)); |
| 956 |
| 957 /* Replaces jpeg_write_scanlines when writing raw downsampled data. */ |
| 958 EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo, |
| 959 JSAMPIMAGE data, |
| 960 JDIMENSION num_lines)); |
| 961 |
| 962 /* Write a special marker. See libjpeg.doc concerning safe usage. */ |
| 963 EXTERN(void) jpeg_write_marker |
| 964 JPP((j_compress_ptr cinfo, int marker, |
| 965 const JOCTET * dataptr, unsigned int datalen)); |
| 966 /* Same, but piecemeal. */ |
| 967 EXTERN(void) jpeg_write_m_header |
| 968 JPP((j_compress_ptr cinfo, int marker, unsigned int datalen)); |
| 969 EXTERN(void) jpeg_write_m_byte |
| 970 JPP((j_compress_ptr cinfo, int val)); |
| 971 |
| 972 /* Alternate compression function: just write an abbreviated table file */ |
| 973 EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo)); |
| 974 |
| 975 /* Decompression startup: read start of JPEG datastream to see what's there */ |
| 976 EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo, |
| 977 boolean require_image)); |
| 978 /* Return value is one of: */ |
| 979 #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ |
| 980 #define JPEG_HEADER_OK 1 /* Found valid image datastream */ |
| 981 #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */ |
| 982 /* If you pass require_image = TRUE (normal case), you need not check for |
| 983 * a TABLES_ONLY return code; an abbreviated file will cause an error exit. |
| 984 * JPEG_SUSPENDED is only possible if you use a data source module that can |
| 985 * give a suspension return (the stdio source module doesn't). |
| 986 */ |
| 987 |
| 988 /* Main entry points for decompression */ |
| 989 EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo)); |
| 990 EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo, |
| 991 JSAMPARRAY scanlines, |
| 992 JDIMENSION max_lines)); |
| 993 EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo)); |
| 994 |
| 995 /* Replaces jpeg_read_scanlines when reading raw downsampled data. */ |
| 996 EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo, |
| 997 JSAMPIMAGE data, |
| 998 JDIMENSION max_lines)); |
| 999 |
| 1000 /* Additional entry points for buffered-image mode. */ |
| 1001 EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo)); |
| 1002 EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo, |
| 1003 int scan_number)); |
| 1004 EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo)); |
| 1005 EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo)); |
| 1006 EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo)); |
| 1007 EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo)); |
| 1008 /* Return value is one of: */ |
| 1009 /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */ |
| 1010 #define JPEG_REACHED_SOS 1 /* Reached start of new scan */ |
| 1011 #define JPEG_REACHED_EOI 2 /* Reached end of image */ |
| 1012 #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */ |
| 1013 #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */ |
| 1014 |
| 1015 /* Precalculate output dimensions for current decompression parameters. */ |
| 1016 EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo)); |
| 1017 |
| 1018 /* Control saving of COM and APPn markers into marker_list. */ |
| 1019 EXTERN(void) jpeg_save_markers |
| 1020 JPP((j_decompress_ptr cinfo, int marker_code, |
| 1021 unsigned int length_limit)); |
| 1022 |
| 1023 /* Install a special processing method for COM or APPn markers. */ |
| 1024 EXTERN(void) jpeg_set_marker_processor |
| 1025 JPP((j_decompress_ptr cinfo, int marker_code, |
| 1026 jpeg_marker_parser_method routine)); |
| 1027 |
| 1028 /* Read or write raw DCT coefficients --- useful for lossless transcoding. */ |
| 1029 EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo)); |
| 1030 EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo, |
| 1031 jvirt_barray_ptr * coef_arrays)); |
| 1032 EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo, |
| 1033 j_compress_ptr dstinfo)); |
| 1034 |
| 1035 /* If you choose to abort compression or decompression before completing |
| 1036 * jpeg_finish_(de)compress, then you need to clean up to release memory, |
| 1037 * temporary files, etc. You can just call jpeg_destroy_(de)compress |
| 1038 * if you're done with the JPEG object, but if you want to clean it up and |
| 1039 * reuse it, call this: |
| 1040 */ |
| 1041 EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo)); |
| 1042 EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo)); |
| 1043 |
| 1044 /* Generic versions of jpeg_abort and jpeg_destroy that work on either |
| 1045 * flavor of JPEG object. These may be more convenient in some places. |
| 1046 */ |
| 1047 EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo)); |
| 1048 EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo)); |
| 1049 |
| 1050 /* Default restart-marker-resync procedure for use by data source modules */ |
| 1051 EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, |
| 1052 int desired)); |
| 1053 |
| 1054 |
| 1055 /* These marker codes are exported since applications and data source modules |
| 1056 * are likely to want to use them. |
| 1057 */ |
| 1058 |
| 1059 #define JPEG_RST0 0xD0 /* RST0 marker code */ |
| 1060 #define JPEG_EOI 0xD9 /* EOI marker code */ |
| 1061 #define JPEG_APP0 0xE0 /* APP0 marker code */ |
| 1062 #define JPEG_COM 0xFE /* COM marker code */ |
| 1063 |
| 1064 |
| 1065 /* If we have a brain-damaged compiler that emits warnings (or worse, errors) |
| 1066 * for structure definitions that are never filled in, keep it quiet by |
| 1067 * supplying dummy definitions for the various substructures. |
| 1068 */ |
| 1069 |
| 1070 #ifdef INCOMPLETE_TYPES_BROKEN |
| 1071 #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */ |
| 1072 struct jvirt_sarray_control { long dummy; }; |
| 1073 struct jvirt_barray_control { long dummy; }; |
| 1074 struct jpeg_comp_master { long dummy; }; |
| 1075 struct jpeg_c_main_controller { long dummy; }; |
| 1076 struct jpeg_c_prep_controller { long dummy; }; |
| 1077 struct jpeg_c_coef_controller { long dummy; }; |
| 1078 struct jpeg_marker_writer { long dummy; }; |
| 1079 struct jpeg_color_converter { long dummy; }; |
| 1080 struct jpeg_downsampler { long dummy; }; |
| 1081 struct jpeg_forward_dct { long dummy; }; |
| 1082 struct jpeg_entropy_encoder { long dummy; }; |
| 1083 struct jpeg_decomp_master { long dummy; }; |
| 1084 struct jpeg_d_main_controller { long dummy; }; |
| 1085 struct jpeg_d_coef_controller { long dummy; }; |
| 1086 struct jpeg_d_post_controller { long dummy; }; |
| 1087 struct jpeg_input_controller { long dummy; }; |
| 1088 struct jpeg_marker_reader { long dummy; }; |
| 1089 struct jpeg_entropy_decoder { long dummy; }; |
| 1090 struct jpeg_inverse_dct { long dummy; }; |
| 1091 struct jpeg_upsampler { long dummy; }; |
| 1092 struct jpeg_color_deconverter { long dummy; }; |
| 1093 struct jpeg_color_quantizer { long dummy; }; |
| 1094 #endif /* JPEG_INTERNALS */ |
| 1095 #endif /* INCOMPLETE_TYPES_BROKEN */ |
| 1096 |
| 1097 |
| 1098 /* |
| 1099 * The JPEG library modules define JPEG_INTERNALS before including this file. |
| 1100 * The internal structure declarations are read only when that is true. |
| 1101 * Applications using the library should not include jpegint.h, but may wish |
| 1102 * to include jerror.h. |
| 1103 */ |
| 1104 |
| 1105 #ifdef JPEG_INTERNALS |
| 1106 #include "jpegint.h" /* fetch private declarations */ |
| 1107 #include "jerror.h" /* fetch error codes too */ |
| 1108 #endif |
| 1109 |
| 1110 #ifdef __cplusplus |
| 1111 } |
| 1112 #endif |
| 1113 |
| 1114 #endif /* JPEGLIB_H */ |
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