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00001 /* 00002 * jpeglib.h 00003 * 00004 * Copyright (C) 1991-1995, Thomas G. Lane. 00005 * This file is part of the Independent JPEG Group's software. 00006 * For conditions of distribution and use, see the accompanying README file. 00007 * 00008 * This file defines the application interface for the JPEG library. 00009 * Most applications using the library need only include this file, 00010 * and perhaps jerror.h if they want to know the exact error codes. 00011 */ 00012 00013 #ifndef JPEGLIB_H 00014 #define JPEGLIB_H 00015 00016 #ifdef __cplusplus 00017 extern "C" 00018 { 00019 #endif 00020 00021 00022 00023 #ifdef __MACOS__ 00024 00025 // JDC: stuff to make mac version compile 00026 #define boolean qboolean 00027 #define register 00028 #define INT32 int 00029 00030 #endif 00031 00032 // rad additions 00033 // 11.29.99 00034 00035 //#include "cmdlib.h" 00036 #ifdef _WIN32 00037 #include "windows.h" 00038 #include "stdio.h" 00039 #endif 00040 00041 #ifndef INT32 00042 #define INT32 int 00043 #endif 00044 00045 00046 /* 00047 * First we include the configuration files that record how this 00048 * installation of the JPEG library is set up. jconfig.h can be 00049 * generated automatically for many systems. jmorecfg.h contains 00050 * manual configuration options that most people need not worry about. 00051 */ 00052 00053 #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */ 00054 #include "jconfig.h" /* widely used configuration options */ 00055 #endif 00056 #include "jmorecfg.h" /* seldom changed options */ 00057 00058 00059 /* Version ID for the JPEG library. 00060 * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60". 00061 */ 00062 00063 #define JPEG_LIB_VERSION 60 /* Version 6 */ 00064 00065 00066 /* Various constants determining the sizes of things. 00067 * All of these are specified by the JPEG standard, so don't change them 00068 * if you want to be compatible. 00069 */ 00070 00071 #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */ 00072 #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */ 00073 #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */ 00074 #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */ 00075 #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */ 00076 #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */ 00077 #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */ 00078 /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard; 00079 * the PostScript DCT filter can emit files with many more than 10 blocks/MCU. 00080 * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU 00081 * to handle it. We even let you do this from the jconfig.h file. However, 00082 * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe 00083 * sometimes emits noncompliant files doesn't mean you should too. 00084 */ 00085 #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */ 00086 #ifndef D_MAX_BLOCKS_IN_MCU 00087 #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */ 00088 #endif 00089 00090 00091 /* This macro is used to declare a "method", that is, a function pointer. 00092 * We want to supply prototype parameters if the compiler can cope. 00093 * Note that the arglist parameter must be parenthesized! 00094 */ 00095 00096 #ifdef HAVE_PROTOTYPES 00097 #define JMETHOD(type,methodname,arglist) type (*methodname) arglist 00098 #else 00099 #define JMETHOD(type,methodname,arglist) type (*methodname) () 00100 #endif 00101 00102 00103 /* Data structures for images (arrays of samples and of DCT coefficients). 00104 * On 80x86 machines, the image arrays are too big for near pointers, 00105 * but the pointer arrays can fit in near memory. 00106 */ 00107 00108 typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */ 00109 typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */ 00110 typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */ 00111 00112 typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */ 00113 typedef JBLOCK FAR *JBLOCKROW; /* pointer to one row of coefficient blocks */ 00114 typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ 00115 typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */ 00116 00117 typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */ 00118 00119 00120 /* Types for JPEG compression parameters and working tables. */ 00121 00122 00123 /* DCT coefficient quantization tables. */ 00124 00125 typedef struct 00126 { 00127 /* This field directly represents the contents of a JPEG DQT marker. 00128 * Note: the values are always given in zigzag order. 00129 */ 00130 UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */ 00131 /* This field is used only during compression. It's initialized FALSE when 00132 * the table is created, and set TRUE when it's been output to the file. 00133 * You could suppress output of a table by setting this to TRUE. 00134 * (See jpeg_suppress_tables for an example.) 00135 */ 00136 boolean sent_table; /* TRUE when table has been output */ 00137 } JQUANT_TBL; 00138 00139 00140 /* Huffman coding tables. */ 00141 00142 typedef struct 00143 { 00144 /* These two fields directly represent the contents of a JPEG DHT marker */ 00145 UINT8 bits[17]; /* bits[k] = # of symbols with codes of */ 00146 /* length k bits; bits[0] is unused */ 00147 UINT8 huffval[256]; /* The symbols, in order of incr code length */ 00148 /* This field is used only during compression. It's initialized FALSE when 00149 * the table is created, and set TRUE when it's been output to the file. 00150 * You could suppress output of a table by setting this to TRUE. 00151 * (See jpeg_suppress_tables for an example.) 00152 */ 00153 boolean sent_table; /* TRUE when table has been output */ 00154 } JHUFF_TBL; 00155 00156 00157 /* Basic info about one component (color channel). */ 00158 00159 typedef struct 00160 { 00161 /* These values are fixed over the whole image. */ 00162 /* For compression, they must be supplied by parameter setup; */ 00163 /* for decompression, they are read from the SOF marker. */ 00164 int component_id; /* identifier for this component (0..255) */ 00165 int component_index; /* its index in SOF or cinfo->comp_info[] */ 00166 int h_samp_factor; /* horizontal sampling factor (1..4) */ 00167 int v_samp_factor; /* vertical sampling factor (1..4) */ 00168 int quant_tbl_no; /* quantization table selector (0..3) */ 00169 /* These values may vary between scans. */ 00170 /* For compression, they must be supplied by parameter setup; */ 00171 /* for decompression, they are read from the SOS marker. */ 00172 /* The decompressor output side may not use these variables. */ 00173 int dc_tbl_no; /* DC entropy table selector (0..3) */ 00174 int ac_tbl_no; /* AC entropy table selector (0..3) */ 00175 00176 /* Remaining fields should be treated as private by applications. */ 00177 00178 /* These values are computed during compression or decompression startup: */ 00179 /* Component's size in DCT blocks. 00180 * Any dummy blocks added to complete an MCU are not counted; therefore 00181 * these values do not depend on whether a scan is interleaved or not. 00182 */ 00183 JDIMENSION width_in_blocks; 00184 JDIMENSION height_in_blocks; 00185 /* Size of a DCT block in samples. Always DCTSIZE for compression. 00186 * For decompression this is the size of the output from one DCT block, 00187 * reflecting any scaling we choose to apply during the IDCT step. 00188 * Values of 1,2,4,8 are likely to be supported. Note that different 00189 * components may receive different IDCT scalings. 00190 */ 00191 int DCT_scaled_size; 00192 /* The downsampled dimensions are the component's actual, unpadded number 00193 * of samples at the main buffer (preprocessing/compression interface), thus 00194 * downsampled_width = ceil(image_width * Hi/Hmax) 00195 * and similarly for height. For decompression, IDCT scaling is included, so 00196 * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE) 00197 */ 00198 JDIMENSION downsampled_width; /* actual width in samples */ 00199 JDIMENSION downsampled_height; /* actual height in samples */ 00200 /* This flag is used only for decompression. In cases where some of the 00201 * components will be ignored (eg grayscale output from YCbCr image), 00202 * we can skip most computations for the unused components. 00203 */ 00204 boolean component_needed; /* do we need the value of this component? */ 00205 00206 /* These values are computed before starting a scan of the component. */ 00207 /* The decompressor output side may not use these variables. */ 00208 int MCU_width; /* number of blocks per MCU, horizontally */ 00209 int MCU_height; /* number of blocks per MCU, vertically */ 00210 int MCU_blocks; /* MCU_width * MCU_height */ 00211 int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */ 00212 int last_col_width; /* # of non-dummy blocks across in last MCU */ 00213 int last_row_height; /* # of non-dummy blocks down in last MCU */ 00214 00215 /* Saved quantization table for component; NULL if none yet saved. 00216 * See jdinput.c comments about the need for this information. 00217 * This field is not currently used by the compressor. 00218 */ 00219 JQUANT_TBL * quant_table; 00220 00221 /* Private per-component storage for DCT or IDCT subsystem. */ 00222 void * dct_table; 00223 } jpeg_component_info; 00224 00225 00226 /* The script for encoding a multiple-scan file is an array of these: */ 00227 00228 typedef struct 00229 { 00230 int comps_in_scan; /* number of components encoded in this scan */ 00231 int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */ 00232 int Ss, Se; /* progressive JPEG spectral selection parms */ 00233 int Ah, Al; /* progressive JPEG successive approx. parms */ 00234 } jpeg_scan_info; 00235 00236 00237 /* Known color spaces. */ 00238 00239 typedef enum 00240 { 00241 JCS_UNKNOWN, /* error/unspecified */ 00242 JCS_GRAYSCALE, /* monochrome */ 00243 JCS_RGB, /* red/green/blue */ 00244 JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */ 00245 JCS_CMYK, /* C/M/Y/K */ 00246 JCS_YCCK /* Y/Cb/Cr/K */ 00247 } J_COLOR_SPACE; 00248 00249 /* DCT/IDCT algorithm options. */ 00250 00251 typedef enum 00252 { 00253 JDCT_ISLOW, /* slow but accurate integer algorithm */ 00254 JDCT_IFAST, /* faster, less accurate integer method */ 00255 JDCT_FLOAT /* floating-point: accurate, fast on fast HW */ 00256 } J_DCT_METHOD; 00257 00258 #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */ 00259 #define JDCT_DEFAULT JDCT_ISLOW 00260 #endif 00261 #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */ 00262 #define JDCT_FASTEST JDCT_IFAST 00263 #endif 00264 00265 /* Dithering options for decompression. */ 00266 00267 typedef enum 00268 { 00269 JDITHER_NONE, /* no dithering */ 00270 JDITHER_ORDERED, /* simple ordered dither */ 00271 JDITHER_FS /* Floyd-Steinberg error diffusion dither */ 00272 } J_DITHER_MODE; 00273 00274 00275 /* Common fields between JPEG compression and decompression master structs. */ 00276 00277 #define jpeg_common_fields \ 00278 struct jpeg_error_mgr * err; /* Error handler module */\ 00279 struct jpeg_memory_mgr * mem; /* Memory manager module */\ 00280 struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\ 00281 boolean is_decompressor; /* so common code can tell which is which */\ 00282 int global_state /* for checking call sequence validity */ 00283 00284 /* Routines that are to be used by both halves of the library are declared 00285 * to receive a pointer to this structure. There are no actual instances of 00286 * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct. 00287 */ 00288 struct jpeg_common_struct 00289 { 00290 jpeg_common_fields; /* Fields common to both master struct types */ 00291 /* Additional fields follow in an actual jpeg_compress_struct or 00292 * jpeg_decompress_struct. All three structs must agree on these 00293 * initial fields! (This would be a lot cleaner in C++.) 00294 */ 00295 }; 00296 00297 typedef struct jpeg_common_struct * j_common_ptr; 00298 typedef struct jpeg_compress_struct * j_compress_ptr; 00299 typedef struct jpeg_decompress_struct * j_decompress_ptr; 00300 00301 00302 /* Master record for a compression instance */ 00303 00304 struct jpeg_compress_struct 00305 { 00306 jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */ 00307 00308 /* Destination for compressed data */ 00309 struct jpeg_destination_mgr * dest; 00310 00311 /* Description of source image --- these fields must be filled in by 00312 * outer application before starting compression. in_color_space must 00313 * be correct before you can even call jpeg_set_defaults(). 00314 */ 00315 00316 JDIMENSION image_width; /* input image width */ 00317 JDIMENSION image_height; /* input image height */ 00318 int input_components; /* # of color components in input image */ 00319 J_COLOR_SPACE in_color_space; /* colorspace of input image */ 00320 00321 double input_gamma; /* image gamma of input image */ 00322 00323 /* Compression parameters --- these fields must be set before calling 00324 * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to 00325 * initialize everything to reasonable defaults, then changing anything 00326 * the application specifically wants to change. That way you won't get 00327 * burnt when new parameters are added. Also note that there are several 00328 * helper routines to simplify changing parameters. 00329 */ 00330 00331 int data_precision; /* bits of precision in image data */ 00332 00333 int num_components; /* # of color components in JPEG image */ 00334 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ 00335 00336 jpeg_component_info * comp_info; 00337 /* comp_info[i] describes component that appears i'th in SOF */ 00338 00339 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; 00340 /* ptrs to coefficient quantization tables, or NULL if not defined */ 00341 00342 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; 00343 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; 00344 /* ptrs to Huffman coding tables, or NULL if not defined */ 00345 00346 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ 00347 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ 00348 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ 00349 00350 int num_scans; /* # of entries in scan_info array */ 00351 const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */ 00352 /* The default value of scan_info is NULL, which causes a single-scan 00353 * sequential JPEG file to be emitted. To create a multi-scan file, 00354 * set num_scans and scan_info to point to an array of scan definitions. 00355 */ 00356 00357 boolean raw_data_in; /* TRUE=caller supplies downsampled data */ 00358 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ 00359 boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ 00360 boolean CCIR601_sampling; /* TRUE=first samples are cosited */ 00361 int smoothing_factor; /* 1..100, or 0 for no input smoothing */ 00362 J_DCT_METHOD dct_method; /* DCT algorithm selector */ 00363 00364 /* The restart interval can be specified in absolute MCUs by setting 00365 * restart_interval, or in MCU rows by setting restart_in_rows 00366 * (in which case the correct restart_interval will be figured 00367 * for each scan). 00368 */ 00369 unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */ 00370 int restart_in_rows; /* if > 0, MCU rows per restart interval */ 00371 00372 /* Parameters controlling emission of special markers. */ 00373 00374 boolean write_JFIF_header; /* should a JFIF marker be written? */ 00375 /* These three values are not used by the JPEG code, merely copied */ 00376 /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */ 00377 /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */ 00378 /* ratio is defined by X_density/Y_density even when density_unit=0. */ 00379 UINT8 density_unit; /* JFIF code for pixel size units */ 00380 UINT16 X_density; /* Horizontal pixel density */ 00381 UINT16 Y_density; /* Vertical pixel density */ 00382 boolean write_Adobe_marker; /* should an Adobe marker be written? */ 00383 00384 /* State variable: index of next scanline to be written to 00385 * jpeg_write_scanlines(). Application may use this to control its 00386 * processing loop, e.g., "while (next_scanline < image_height)". 00387 */ 00388 00389 JDIMENSION next_scanline; /* 0 .. image_height-1 */ 00390 00391 /* Remaining fields are known throughout compressor, but generally 00392 * should not be touched by a surrounding application. 00393 */ 00394 00395 /* 00396 * These fields are computed during compression startup 00397 */ 00398 boolean progressive_mode; /* TRUE if scan script uses progressive mode */ 00399 int max_h_samp_factor; /* largest h_samp_factor */ 00400 int max_v_samp_factor; /* largest v_samp_factor */ 00401 00402 JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */ 00403 /* The coefficient controller receives data in units of MCU rows as defined 00404 * for fully interleaved scans (whether the JPEG file is interleaved or not). 00405 * There are v_samp_factor * DCTSIZE sample rows of each component in an 00406 * "iMCU" (interleaved MCU) row. 00407 */ 00408 00409 /* 00410 * These fields are valid during any one scan. 00411 * They describe the components and MCUs actually appearing in the scan. 00412 */ 00413 int comps_in_scan; /* # of JPEG components in this scan */ 00414 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; 00415 /* *cur_comp_info[i] describes component that appears i'th in SOS */ 00416 00417 JDIMENSION MCUs_per_row; /* # of MCUs across the image */ 00418 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ 00419 00420 int blocks_in_MCU; /* # of DCT blocks per MCU */ 00421 int MCU_membership[C_MAX_BLOCKS_IN_MCU]; 00422 /* MCU_membership[i] is index in cur_comp_info of component owning */ 00423 /* i'th block in an MCU */ 00424 00425 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ 00426 00427 /* 00428 * Links to compression subobjects (methods and private variables of modules) 00429 */ 00430 struct jpeg_comp_master * master; 00431 struct jpeg_c_main_controller * main; 00432 struct jpeg_c_prep_controller * prep; 00433 struct jpeg_c_coef_controller * coef; 00434 struct jpeg_marker_writer * marker; 00435 struct jpeg_color_converter * cconvert; 00436 struct jpeg_downsampler * downsample; 00437 struct jpeg_forward_dct * fdct; 00438 struct jpeg_entropy_encoder * entropy; 00439 }; 00440 00441 00442 /* Master record for a decompression instance */ 00443 00444 struct jpeg_decompress_struct 00445 { 00446 jpeg_common_fields; /* Fields shared with jpeg_compress_struct */ 00447 00448 /* Source of compressed data */ 00449 struct jpeg_source_mgr * src; 00450 00451 /* Basic description of image --- filled in by jpeg_read_header(). */ 00452 /* Application may inspect these values to decide how to process image. */ 00453 00454 JDIMENSION image_width; /* nominal image width (from SOF marker) */ 00455 JDIMENSION image_height; /* nominal image height */ 00456 int num_components; /* # of color components in JPEG image */ 00457 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ 00458 00459 /* Decompression processing parameters --- these fields must be set before 00460 * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes 00461 * them to default values. 00462 */ 00463 00464 J_COLOR_SPACE out_color_space; /* colorspace for output */ 00465 00466 unsigned int scale_num, scale_denom; /* fraction by which to scale image */ 00467 00468 double output_gamma; /* image gamma wanted in output */ 00469 00470 boolean buffered_image; /* TRUE=multiple output passes */ 00471 boolean raw_data_out; /* TRUE=downsampled data wanted */ 00472 00473 J_DCT_METHOD dct_method; /* IDCT algorithm selector */ 00474 boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */ 00475 boolean do_block_smoothing; /* TRUE=apply interblock smoothing */ 00476 00477 boolean quantize_colors; /* TRUE=colormapped output wanted */ 00478 /* the following are ignored if not quantize_colors: */ 00479 J_DITHER_MODE dither_mode; /* type of color dithering to use */ 00480 boolean two_pass_quantize; /* TRUE=use two-pass color quantization */ 00481 int desired_number_of_colors; /* max # colors to use in created colormap */ 00482 /* these are significant only in buffered-image mode: */ 00483 boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ 00484 boolean enable_external_quant;/* enable future use of external colormap */ 00485 boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ 00486 00487 /* Description of actual output image that will be returned to application. 00488 * These fields are computed by jpeg_start_decompress(). 00489 * You can also use jpeg_calc_output_dimensions() to determine these values 00490 * in advance of calling jpeg_start_decompress(). 00491 */ 00492 00493 JDIMENSION output_width; /* scaled image width */ 00494 JDIMENSION output_height; /* scaled image height */ 00495 int out_color_components; /* # of color components in out_color_space */ 00496 int output_components; /* # of color components returned */ 00497 /* output_components is 1 (a colormap index) when quantizing colors; 00498 * otherwise it equals out_color_components. 00499 */ 00500 int rec_outbuf_height; /* min recommended height of scanline buffer */ 00501 /* If the buffer passed to jpeg_read_scanlines() is less than this many rows 00502 * high, space and time will be wasted due to unnecessary data copying. 00503 * Usually rec_outbuf_height will be 1 or 2, at most 4. 00504 */ 00505 00506 /* When quantizing colors, the output colormap is described by these fields. 00507 * The application can supply a colormap by setting colormap non-NULL before 00508 * calling jpeg_start_decompress; otherwise a colormap is created during 00509 * jpeg_start_decompress or jpeg_start_output. 00510 * The map has out_color_components rows and actual_number_of_colors columns. 00511 */ 00512 int actual_number_of_colors; /* number of entries in use */ 00513 JSAMPARRAY colormap; /* The color map as a 2-D pixel array */ 00514 00515 /* State variables: these variables indicate the progress of decompression. 00516 * The application may examine these but must not modify them. 00517 */ 00518 00519 /* Row index of next scanline to be read from jpeg_read_scanlines(). 00520 * Application may use this to control its processing loop, e.g., 00521 * "while (output_scanline < output_height)". 00522 */ 00523 JDIMENSION output_scanline; /* 0 .. output_height-1 */ 00524 00525 /* Current input scan number and number of iMCU rows completed in scan. 00526 * These indicate the progress of the decompressor input side. 00527 */ 00528 int input_scan_number; /* Number of SOS markers seen so far */ 00529 JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */ 00530 00531 /* The "output scan number" is the notional scan being displayed by the 00532 * output side. The decompressor will not allow output scan/row number 00533 * to get ahead of input scan/row, but it can fall arbitrarily far behind. 00534 */ 00535 int output_scan_number; /* Nominal scan number being displayed */ 00536 JDIMENSION output_iMCU_row; /* Number of iMCU rows read */ 00537 00538 /* Current progression status. coef_bits[c][i] indicates the precision 00539 * with which component c's DCT coefficient i (in zigzag order) is known. 00540 * It is -1 when no data has yet been received, otherwise it is the point 00541 * transform (shift) value for the most recent scan of the coefficient 00542 * (thus, 0 at completion of the progression). 00543 * This pointer is NULL when reading a non-progressive file. 00544 */ 00545 int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */ 00546 00547 /* Internal JPEG parameters --- the application usually need not look at 00548 * these fields. Note that the decompressor output side may not use 00549 * any parameters that can change between scans. 00550 */ 00551 00552 /* Quantization and Huffman tables are carried forward across input 00553 * datastreams when processing abbreviated JPEG datastreams. 00554 */ 00555 00556 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; 00557 /* ptrs to coefficient quantization tables, or NULL if not defined */ 00558 00559 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; 00560 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; 00561 /* ptrs to Huffman coding tables, or NULL if not defined */ 00562 00563 /* These parameters are never carried across datastreams, since they 00564 * are given in SOF/SOS markers or defined to be reset by SOI. 00565 */ 00566 00567 int data_precision; /* bits of precision in image data */ 00568 00569 jpeg_component_info * comp_info; 00570 /* comp_info[i] describes component that appears i'th in SOF */ 00571 00572 boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */ 00573 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ 00574 00575 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ 00576 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ 00577 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ 00578 00579 unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */ 00580 00581 /* These fields record data obtained from optional markers recognized by 00582 * the JPEG library. 00583 */ 00584 boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */ 00585 /* Data copied from JFIF marker: */ 00586 UINT8 density_unit; /* JFIF code for pixel size units */ 00587 UINT16 X_density; /* Horizontal pixel density */ 00588 UINT16 Y_density; /* Vertical pixel density */ 00589 boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */ 00590 UINT8 Adobe_transform; /* Color transform code from Adobe marker */ 00591 00592 boolean CCIR601_sampling; /* TRUE=first samples are cosited */ 00593 00594 /* Remaining fields are known throughout decompressor, but generally 00595 * should not be touched by a surrounding application. 00596 */ 00597 00598 /* 00599 * These fields are computed during decompression startup 00600 */ 00601 int max_h_samp_factor; /* largest h_samp_factor */ 00602 int max_v_samp_factor; /* largest v_samp_factor */ 00603 00604 int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */ 00605 00606 JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */ 00607 /* The coefficient controller's input and output progress is measured in 00608 * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows 00609 * in fully interleaved JPEG scans, but are used whether the scan is 00610 * interleaved or not. We define an iMCU row as v_samp_factor DCT block 00611 * rows of each component. Therefore, the IDCT output contains 00612 * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row. 00613 */ 00614 00615 JSAMPLE * sample_range_limit; /* table for fast range-limiting */ 00616 00617 /* 00618 * These fields are valid during any one scan. 00619 * They describe the components and MCUs actually appearing in the scan. 00620 * Note that the decompressor output side must not use these fields. 00621 */ 00622 int comps_in_scan; /* # of JPEG components in this scan */ 00623 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; 00624 /* *cur_comp_info[i] describes component that appears i'th in SOS */ 00625 00626 JDIMENSION MCUs_per_row; /* # of MCUs across the image */ 00627 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ 00628 00629 int blocks_in_MCU; /* # of DCT blocks per MCU */ 00630 int MCU_membership[D_MAX_BLOCKS_IN_MCU]; 00631 /* MCU_membership[i] is index in cur_comp_info of component owning */ 00632 /* i'th block in an MCU */ 00633 00634 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ 00635 00636 /* This field is shared between entropy decoder and marker parser. 00637 * It is either zero or the code of a JPEG marker that has been 00638 * read from the data source, but has not yet been processed. 00639 */ 00640 int unread_marker; 00641 00642 /* 00643 * Links to decompression subobjects (methods, private variables of modules) 00644 */ 00645 struct jpeg_decomp_master * master; 00646 struct jpeg_d_main_controller * main; 00647 struct jpeg_d_coef_controller * coef; 00648 struct jpeg_d_post_controller * post; 00649 struct jpeg_input_controller * inputctl; 00650 struct jpeg_marker_reader * marker; 00651 struct jpeg_entropy_decoder * entropy; 00652 struct jpeg_inverse_dct * idct; 00653 struct jpeg_upsampler * upsample; 00654 struct jpeg_color_deconverter * cconvert; 00655 struct jpeg_color_quantizer * cquantize; 00656 }; 00657 00658 00659 /* "Object" declarations for JPEG modules that may be supplied or called 00660 * directly by the surrounding application. 00661 * As with all objects in the JPEG library, these structs only define the 00662 * publicly visible methods and state variables of a module. Additional 00663 * private fields may exist after the public ones. 00664 */ 00665 00666 00667 /* Error handler object */ 00668 00669 struct jpeg_error_mgr 00670 { 00671 /* Error exit handler: does not return to caller */ 00672 JMETHOD(void, error_exit, (j_common_ptr cinfo)); 00673 /* Conditionally emit a trace or warning message */ 00674 JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level)); 00675 /* Routine that actually outputs a trace or error message */ 00676 JMETHOD(void, output_message, (j_common_ptr cinfo)); 00677 /* Format a message string for the most recent JPEG error or message */ 00678 JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer)); 00679 #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */ 00680 /* Reset error state variables at start of a new image */ 00681 JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo)); 00682 00683 /* The message ID code and any parameters are saved here. 00684 * A message can have one string parameter or up to 8 int parameters. 00685 */ 00686 int msg_code; 00687 #define JMSG_STR_PARM_MAX 80 00688 union 00689 { 00690 int i[8]; 00691 char s[JMSG_STR_PARM_MAX]; 00692 } msg_parm; 00693 00694 /* Standard state variables for error facility */ 00695 00696 int trace_level; /* max msg_level that will be displayed */ 00697 00698 /* For recoverable corrupt-data errors, we emit a warning message, 00699 * but keep going unless emit_message chooses to abort. emit_message 00700 * should count warnings in num_warnings. The surrounding application 00701 * can check for bad data by seeing if num_warnings is nonzero at the 00702 * end of processing. 00703 */ 00704 long num_warnings; /* number of corrupt-data warnings */ 00705 00706 /* These fields point to the table(s) of error message strings. 00707 * An application can change the table pointer to switch to a different 00708 * message list (typically, to change the language in which errors are 00709 * reported). Some applications may wish to add additional error codes 00710 * that will be handled by the JPEG library error mechanism; the second 00711 * table pointer is used for this purpose. 00712 * 00713 * First table includes all errors generated by JPEG library itself. 00714 * Error code 0 is reserved for a "no such error string" message. 00715 */ 00716 const char * const * jpeg_message_table; /* Library errors */ 00717 int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */ 00718 /* Second table can be added by application (see cjpeg/djpeg for example). 00719 * It contains strings numbered first_addon_message..last_addon_message. 00720 */ 00721 const char * const * addon_message_table; /* Non-library errors */ 00722 int first_addon_message; /* code for first string in addon table */ 00723 int last_addon_message; /* code for last string in addon table */ 00724 }; 00725 00726 00727 /* Progress monitor object */ 00728 00729 struct jpeg_progress_mgr 00730 { 00731 JMETHOD(void, progress_monitor, (j_common_ptr cinfo)); 00732 00733 long pass_counter; /* work units completed in this pass */ 00734 long pass_limit; /* total number of work units in this pass */ 00735 int completed_passes; /* passes completed so far */ 00736 int total_passes; /* total number of passes expected */ 00737 }; 00738 00739 00740 /* Data destination object for compression */ 00741 00742 struct jpeg_destination_mgr 00743 { 00744 JOCTET * next_output_byte; /* => next byte to write in buffer */ 00745 size_t free_in_buffer; /* # of byte spaces remaining in buffer */ 00746 00747 JMETHOD(void, init_destination, (j_compress_ptr cinfo)); 00748 JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo)); 00749 JMETHOD(void, term_destination, (j_compress_ptr cinfo)); 00750 }; 00751 00752 00753 /* Data source object for decompression */ 00754 00755 struct jpeg_source_mgr 00756 { 00757 const JOCTET * next_input_byte; /* => next byte to read from buffer */ 00758 size_t bytes_in_buffer; /* # of bytes remaining in buffer */ 00759 00760 JMETHOD(void, init_source, (j_decompress_ptr cinfo)); 00761 JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo)); 00762 JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes)); 00763 JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired)); 00764 JMETHOD(void, term_source, (j_decompress_ptr cinfo)); 00765 }; 00766 00767 00768 /* Memory manager object. 00769 * Allocates "small" objects (a few K total), "large" objects (tens of K), 00770 * and "really big" objects (virtual arrays with backing store if needed). 00771 * The memory manager does not allow individual objects to be freed; rather, 00772 * each created object is assigned to a pool, and whole pools can be freed 00773 * at once. This is faster and more convenient than remembering exactly what 00774 * to free, especially where malloc()/free() are not too speedy. 00775 * NB: alloc routines never return NULL. They exit to error_exit if not 00776 * successful. 00777 */ 00778 00779 #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */ 00780 #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */ 00781 #define JPOOL_NUMPOOLS 2 00782 00783 typedef struct jvirt_sarray_control * jvirt_sarray_ptr; 00784 typedef struct jvirt_barray_control * jvirt_barray_ptr; 00785 00786 00787 struct jpeg_memory_mgr 00788 { 00789 /* Method pointers */ 00790 JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id, 00791 size_t sizeofobject)); 00792 JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id, 00793 size_t sizeofobject)); 00794 JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id, 00795 JDIMENSION samplesperrow, 00796 JDIMENSION numrows)); 00797 JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id, 00798 JDIMENSION blocksperrow, 00799 JDIMENSION numrows)); 00800 JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo, 00801 int pool_id, 00802 boolean pre_zero, 00803 JDIMENSION samplesperrow, 00804 JDIMENSION numrows, 00805 JDIMENSION maxaccess)); 00806 JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo, 00807 int pool_id, 00808 boolean pre_zero, 00809 JDIMENSION blocksperrow, 00810 JDIMENSION numrows, 00811 JDIMENSION maxaccess)); 00812 JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo)); 00813 JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo, 00814 jvirt_sarray_ptr ptr, 00815 JDIMENSION start_row, 00816 JDIMENSION num_rows, 00817 boolean writable)); 00818 JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo, 00819 jvirt_barray_ptr ptr, 00820 JDIMENSION start_row, 00821 JDIMENSION num_rows, 00822 boolean writable)); 00823 JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id)); 00824 JMETHOD(void, self_destruct, (j_common_ptr cinfo)); 00825 00826 /* Limit on memory allocation for this JPEG object. (Note that this is 00827 * merely advisory, not a guaranteed maximum; it only affects the space 00828 * used for virtual-array buffers.) May be changed by outer application 00829 * after creating the JPEG object. 00830 */ 00831 long max_memory_to_use; 00832 }; 00833 00834 00835 /* Routine signature for application-supplied marker processing methods. 00836 * Need not pass marker code since it is stored in cinfo->unread_marker. 00837 */ 00838 typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo)); 00839 00840 00841 /* Declarations for routines called by application. 00842 * The JPP macro hides prototype parameters from compilers that can't cope. 00843 * Note JPP requires double parentheses. 00844 */ 00845 00846 #ifdef HAVE_PROTOTYPES 00847 #define JPP(arglist) arglist 00848 #else 00849 #define JPP(arglist) () 00850 #endif 00851 00852 00853 /* Short forms of external names for systems with brain-damaged linkers. 00854 * We shorten external names to be unique in the first six letters, which 00855 * is good enough for all known systems. 00856 * (If your compiler itself needs names to be unique in less than 15 00857 * characters, you are out of luck. Get a better compiler.) 00858 */ 00859 00860 #ifdef NEED_SHORT_EXTERNAL_NAMES 00861 #define jpeg_std_error jStdError 00862 #define jpeg_create_compress jCreaCompress 00863 #define jpeg_create_decompress jCreaDecompress 00864 #define jpeg_destroy_compress jDestCompress 00865 #define jpeg_destroy_decompress jDestDecompress 00866 #define jpeg_stdio_dest jStdDest 00867 #define jpeg_stdio_src jStdSrc 00868 #define jpeg_set_defaults jSetDefaults 00869 #define jpeg_set_colorspace jSetColorspace 00870 #define jpeg_default_colorspace jDefColorspace 00871 #define jpeg_set_quality jSetQuality 00872 #define jpeg_set_linear_quality jSetLQuality 00873 #define jpeg_add_quant_table jAddQuantTable 00874 #define jpeg_quality_scaling jQualityScaling 00875 #define jpeg_simple_progression jSimProgress 00876 #define jpeg_suppress_tables jSuppressTables 00877 #define jpeg_alloc_quant_table jAlcQTable 00878 #define jpeg_alloc_huff_table jAlcHTable 00879 #define jpeg_start_compress jStrtCompress 00880 #define jpeg_write_scanlines jWrtScanlines 00881 #define jpeg_finish_compress jFinCompress 00882 #define jpeg_write_raw_data jWrtRawData 00883 #define jpeg_write_marker jWrtMarker 00884 #define jpeg_write_tables jWrtTables 00885 #define jpeg_read_header jReadHeader 00886 #define jpeg_start_decompress jStrtDecompress 00887 #define jpeg_read_scanlines jReadScanlines 00888 #define jpeg_finish_decompress jFinDecompress 00889 #define jpeg_read_raw_data jReadRawData 00890 #define jpeg_has_multiple_scans jHasMultScn 00891 #define jpeg_start_output jStrtOutput 00892 #define jpeg_finish_output jFinOutput 00893 #define jpeg_input_complete jInComplete 00894 #define jpeg_new_colormap jNewCMap 00895 #define jpeg_consume_input jConsumeInput 00896 #define jpeg_calc_output_dimensions jCalcDimensions 00897 #define jpeg_set_marker_processor jSetMarker 00898 #define jpeg_read_coefficients jReadCoefs 00899 #define jpeg_write_coefficients jWrtCoefs 00900 #define jpeg_copy_critical_parameters jCopyCrit 00901 #define jpeg_abort_compress jAbrtCompress 00902 #define jpeg_abort_decompress jAbrtDecompress 00903 #define jpeg_abort jAbort 00904 #define jpeg_destroy jDestroy 00905 #define jpeg_resync_to_restart jResyncRestart 00906 #endif /* NEED_SHORT_EXTERNAL_NAMES */ 00907 00908 00909 /* Default error-management setup */ 00910 EXTERN struct jpeg_error_mgr *jpeg_std_error JPP((struct jpeg_error_mgr *err)); 00911 00912 /* Initialization and destruction of JPEG compression objects */ 00913 /* NB: you must set up the error-manager BEFORE calling jpeg_create_xxx */ 00914 EXTERN void jpeg_create_compress JPP((j_compress_ptr cinfo)); 00915 EXTERN void jpeg_create_decompress JPP((j_decompress_ptr cinfo)); 00916 EXTERN void jpeg_destroy_compress JPP((j_compress_ptr cinfo)); 00917 EXTERN void jpeg_destroy_decompress JPP((j_decompress_ptr cinfo)); 00918 00919 /* Standard data source and destination managers: stdio streams. */ 00920 /* Caller is responsible for opening the file before and closing after. */ 00921 EXTERN void jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile)); 00922 EXTERN void jpeg_stdio_src JPP((j_decompress_ptr cinfo, unsigned char *infile)); 00923 00924 /* Default parameter setup for compression */ 00925 EXTERN void jpeg_set_defaults JPP((j_compress_ptr cinfo)); 00926 /* Compression parameter setup aids */ 00927 EXTERN void jpeg_set_colorspace JPP((j_compress_ptr cinfo, 00928 J_COLOR_SPACE colorspace)); 00929 EXTERN void jpeg_default_colorspace JPP((j_compress_ptr cinfo)); 00930 EXTERN void jpeg_set_quality JPP((j_compress_ptr cinfo, int quality, 00931 boolean force_baseline)); 00932 EXTERN void jpeg_set_linear_quality JPP((j_compress_ptr cinfo, 00933 int scale_factor, 00934 boolean force_baseline)); 00935 EXTERN void jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl, 00936 const unsigned int *basic_table, 00937 int scale_factor, 00938 boolean force_baseline)); 00939 EXTERN int jpeg_quality_scaling JPP((int quality)); 00940 EXTERN void jpeg_simple_progression JPP((j_compress_ptr cinfo)); 00941 EXTERN void jpeg_suppress_tables JPP((j_compress_ptr cinfo, 00942 boolean suppress)); 00943 EXTERN JQUANT_TBL * jpeg_alloc_quant_table JPP((j_common_ptr cinfo)); 00944 EXTERN JHUFF_TBL * jpeg_alloc_huff_table JPP((j_common_ptr cinfo)); 00945 00946 /* Main entry points for compression */ 00947 EXTERN void jpeg_start_compress JPP((j_compress_ptr cinfo, 00948 boolean write_all_tables)); 00949 EXTERN JDIMENSION jpeg_write_scanlines JPP((j_compress_ptr cinfo, 00950 JSAMPARRAY scanlines, 00951 JDIMENSION num_lines)); 00952 EXTERN void jpeg_finish_compress JPP((j_compress_ptr cinfo)); 00953 00954 /* Replaces jpeg_write_scanlines when writing raw downsampled data. */ 00955 EXTERN JDIMENSION jpeg_write_raw_data JPP((j_compress_ptr cinfo, 00956 JSAMPIMAGE data, 00957 JDIMENSION num_lines)); 00958 00959 /* Write a special marker. See libjpeg.doc concerning safe usage. */ 00960 EXTERN void jpeg_write_marker JPP((j_compress_ptr cinfo, int marker, 00961 const JOCTET *dataptr, unsigned int datalen)); 00962 00963 /* Alternate compression function: just write an abbreviated table file */ 00964 EXTERN void jpeg_write_tables JPP((j_compress_ptr cinfo)); 00965 00966 /* Decompression startup: read start of JPEG datastream to see what's there */ 00967 EXTERN int jpeg_read_header JPP((j_decompress_ptr cinfo, 00968 boolean require_image)); 00969 /* Return value is one of: */ 00970 #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ 00971 #define JPEG_HEADER_OK 1 /* Found valid image datastream */ 00972 #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */ 00973 /* If you pass require_image = TRUE (normal case), you need not check for 00974 * a TABLES_ONLY return code; an abbreviated file will cause an error exit. 00975 * JPEG_SUSPENDED is only possible if you use a data source module that can 00976 * give a suspension return (the stdio source module doesn't). 00977 */ 00978 00979 /* Main entry points for decompression */ 00980 EXTERN boolean jpeg_start_decompress JPP((j_decompress_ptr cinfo)); 00981 EXTERN JDIMENSION jpeg_read_scanlines JPP((j_decompress_ptr cinfo, 00982 JSAMPARRAY scanlines, 00983 JDIMENSION max_lines)); 00984 EXTERN boolean jpeg_finish_decompress JPP((j_decompress_ptr cinfo)); 00985 00986 /* Replaces jpeg_read_scanlines when reading raw downsampled data. */ 00987 EXTERN JDIMENSION jpeg_read_raw_data JPP((j_decompress_ptr cinfo, 00988 JSAMPIMAGE data, 00989 JDIMENSION max_lines)); 00990 00991 /* Additional entry points for buffered-image mode. */ 00992 EXTERN boolean jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo)); 00993 EXTERN boolean jpeg_start_output JPP((j_decompress_ptr cinfo, 00994 int scan_number)); 00995 EXTERN boolean jpeg_finish_output JPP((j_decompress_ptr cinfo)); 00996 EXTERN boolean jpeg_input_complete JPP((j_decompress_ptr cinfo)); 00997 EXTERN void jpeg_new_colormap JPP((j_decompress_ptr cinfo)); 00998 EXTERN int jpeg_consume_input JPP((j_decompress_ptr cinfo)); 00999 /* Return value is one of: */ 01000 /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */ 01001 #define JPEG_REACHED_SOS 1 /* Reached start of new scan */ 01002 #define JPEG_REACHED_EOI 2 /* Reached end of image */ 01003 #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */ 01004 #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */ 01005 01006 /* Precalculate output dimensions for current decompression parameters. */ 01007 EXTERN void jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo)); 01008 01009 /* Install a special processing method for COM or APPn markers. */ 01010 EXTERN void jpeg_set_marker_processor JPP((j_decompress_ptr cinfo, 01011 int marker_code, 01012 jpeg_marker_parser_method routine)); 01013 01014 /* Read or write raw DCT coefficients --- useful for lossless transcoding. */ 01015 EXTERN jvirt_barray_ptr * jpeg_read_coefficients JPP((j_decompress_ptr cinfo)); 01016 EXTERN void jpeg_write_coefficients JPP((j_compress_ptr cinfo, 01017 jvirt_barray_ptr * coef_arrays)); 01018 EXTERN void jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo, 01019 j_compress_ptr dstinfo)); 01020 01021 /* If you choose to abort compression or decompression before completing 01022 * jpeg_finish_(de)compress, then you need to clean up to release memory, 01023 * temporary files, etc. You can just call jpeg_destroy_(de)compress 01024 * if you're done with the JPEG object, but if you want to clean it up and 01025 * reuse it, call this: 01026 */ 01027 EXTERN void jpeg_abort_compress JPP((j_compress_ptr cinfo)); 01028 EXTERN void jpeg_abort_decompress JPP((j_decompress_ptr cinfo)); 01029 01030 /* Generic versions of jpeg_abort and jpeg_destroy that work on either 01031 * flavor of JPEG object. These may be more convenient in some places. 01032 */ 01033 EXTERN void jpeg_abort JPP((j_common_ptr cinfo)); 01034 EXTERN void jpeg_destroy JPP((j_common_ptr cinfo)); 01035 01036 /* Default restart-marker-resync procedure for use by data source modules */ 01037 EXTERN boolean jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, 01038 int desired)); 01039 01040 01041 /* These marker codes are exported since applications and data source modules 01042 * are likely to want to use them. 01043 */ 01044 01045 #define JPEG_RST0 0xD0 /* RST0 marker code */ 01046 #define JPEG_EOI 0xD9 /* EOI marker code */ 01047 #define JPEG_APP0 0xE0 /* APP0 marker code */ 01048 #define JPEG_COM 0xFE /* COM marker code */ 01049 01050 01051 /* If we have a brain-damaged compiler that emits warnings (or worse, errors) 01052 * for structure definitions that are never filled in, keep it quiet by 01053 * supplying dummy definitions for the various substructures. 01054 */ 01055 01056 #ifdef INCOMPLETE_TYPES_BROKEN 01057 #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */ 01058 struct jvirt_sarray_control 01059 { 01060 long dummy; 01061 }; 01062 struct jvirt_barray_control 01063 { 01064 long dummy; 01065 }; 01066 struct jpeg_comp_master 01067 { 01068 long dummy; 01069 }; 01070 struct jpeg_c_main_controller 01071 { 01072 long dummy; 01073 }; 01074 struct jpeg_c_prep_controller 01075 { 01076 long dummy; 01077 }; 01078 struct jpeg_c_coef_controller 01079 { 01080 long dummy; 01081 }; 01082 struct jpeg_marker_writer 01083 { 01084 long dummy; 01085 }; 01086 struct jpeg_color_converter 01087 { 01088 long dummy; 01089 }; 01090 struct jpeg_downsampler 01091 { 01092 long dummy; 01093 }; 01094 struct jpeg_forward_dct 01095 { 01096 long dummy; 01097 }; 01098 struct jpeg_entropy_encoder 01099 { 01100 long dummy; 01101 }; 01102 struct jpeg_decomp_master 01103 { 01104 long dummy; 01105 }; 01106 struct jpeg_d_main_controller 01107 { 01108 long dummy; 01109 }; 01110 struct jpeg_d_coef_controller 01111 { 01112 long dummy; 01113 }; 01114 struct jpeg_d_post_controller 01115 { 01116 long dummy; 01117 }; 01118 struct jpeg_input_controller 01119 { 01120 long dummy; 01121 }; 01122 struct jpeg_marker_reader 01123 { 01124 long dummy; 01125 }; 01126 struct jpeg_entropy_decoder 01127 { 01128 long dummy; 01129 }; 01130 struct jpeg_inverse_dct 01131 { 01132 long dummy; 01133 }; 01134 struct jpeg_upsampler 01135 { 01136 long dummy; 01137 }; 01138 struct jpeg_color_deconverter 01139 { 01140 long dummy; 01141 }; 01142 struct jpeg_color_quantizer 01143 { 01144 long dummy; 01145 }; 01146 #endif /* JPEG_INTERNALS */ 01147 #endif /* INCOMPLETE_TYPES_BROKEN */ 01148 01149 01150 /* 01151 * The JPEG library modules define JPEG_INTERNALS before including this file. 01152 * The internal structure declarations are read only when that is true. 01153 * Applications using the library should not include jpegint.h, but may wish 01154 * to include jerror.h. 01155 */ 01156 01157 #ifdef JPEG_INTERNALS 01158 #include "jpegint.h" /* fetch private declarations */ 01159 #include "jerror.h" /* fetch error codes too */ 01160 #endif 01161 01162 #ifdef __cplusplus 01163 } 01164 #endif 01165 01166 #endif /* JPEGLIB_H */