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annotate CSP2/CSP2_env/env-d9b9114564458d9d-741b3de822f2aaca6c6caa4325c4afce/include/jpeglib.h @ 69:33d812a61356

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planemo upload commit 2e9511a184a1ca667c7be0c6321a36dc4e3d116d
author jpayne
date Tue, 18 Mar 2025 17:55:14 -0400
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jpayne@69 1 /*
jpayne@69 2 * jpeglib.h
jpayne@69 3 *
jpayne@69 4 * Copyright (C) 1991-1998, Thomas G. Lane.
jpayne@69 5 * Modified 2002-2020 by Guido Vollbeding.
jpayne@69 6 * This file is part of the Independent JPEG Group's software.
jpayne@69 7 * For conditions of distribution and use, see the accompanying README file.
jpayne@69 8 *
jpayne@69 9 * This file defines the application interface for the JPEG library.
jpayne@69 10 * Most applications using the library need only include this file,
jpayne@69 11 * and perhaps jerror.h if they want to know the exact error codes.
jpayne@69 12 */
jpayne@69 13
jpayne@69 14 #ifndef JPEGLIB_H
jpayne@69 15 #define JPEGLIB_H
jpayne@69 16
jpayne@69 17 /*
jpayne@69 18 * First we include the configuration files that record how this
jpayne@69 19 * installation of the JPEG library is set up. jconfig.h can be
jpayne@69 20 * generated automatically for many systems. jmorecfg.h contains
jpayne@69 21 * manual configuration options that most people need not worry about.
jpayne@69 22 */
jpayne@69 23
jpayne@69 24 #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */
jpayne@69 25 #include "jconfig.h" /* widely used configuration options */
jpayne@69 26 #endif
jpayne@69 27 #include "jmorecfg.h" /* seldom changed options */
jpayne@69 28
jpayne@69 29
jpayne@69 30 #ifdef __cplusplus
jpayne@69 31 #ifndef DONT_USE_EXTERN_C
jpayne@69 32 extern "C" {
jpayne@69 33 #endif
jpayne@69 34 #endif
jpayne@69 35
jpayne@69 36 /* Version IDs for the JPEG library.
jpayne@69 37 * Might be useful for tests like "#if JPEG_LIB_VERSION >= 90".
jpayne@69 38 */
jpayne@69 39
jpayne@69 40 #define JPEG_LIB_VERSION 90 /* Compatibility version 9.0 */
jpayne@69 41 #define JPEG_LIB_VERSION_MAJOR 9
jpayne@69 42 #define JPEG_LIB_VERSION_MINOR 5
jpayne@69 43
jpayne@69 44
jpayne@69 45 /* Various constants determining the sizes of things.
jpayne@69 46 * All of these are specified by the JPEG standard,
jpayne@69 47 * so don't change them if you want to be compatible.
jpayne@69 48 */
jpayne@69 49
jpayne@69 50 #define DCTSIZE 8 /* The basic DCT block is 8x8 coefficients */
jpayne@69 51 #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */
jpayne@69 52 #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */
jpayne@69 53 #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */
jpayne@69 54 #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */
jpayne@69 55 #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */
jpayne@69 56 #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */
jpayne@69 57 /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
jpayne@69 58 * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
jpayne@69 59 * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
jpayne@69 60 * to handle it. We even let you do this from the jconfig.h file. However,
jpayne@69 61 * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
jpayne@69 62 * sometimes emits noncompliant files doesn't mean you should too.
jpayne@69 63 */
jpayne@69 64 #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */
jpayne@69 65 #ifndef D_MAX_BLOCKS_IN_MCU
jpayne@69 66 #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */
jpayne@69 67 #endif
jpayne@69 68
jpayne@69 69
jpayne@69 70 /* Data structures for images (arrays of samples and of DCT coefficients).
jpayne@69 71 * On 80x86 machines, the image arrays are too big for near pointers,
jpayne@69 72 * but the pointer arrays can fit in near memory.
jpayne@69 73 */
jpayne@69 74
jpayne@69 75 typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */
jpayne@69 76 typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */
jpayne@69 77 typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */
jpayne@69 78
jpayne@69 79 typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */
jpayne@69 80 typedef JBLOCK FAR *JBLOCKROW; /* pointer to one row of coefficient blocks */
jpayne@69 81 typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */
jpayne@69 82 typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */
jpayne@69 83
jpayne@69 84 typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */
jpayne@69 85
jpayne@69 86
jpayne@69 87 /* Types for JPEG compression parameters and working tables. */
jpayne@69 88
jpayne@69 89
jpayne@69 90 /* DCT coefficient quantization tables. */
jpayne@69 91
jpayne@69 92 typedef struct {
jpayne@69 93 /* This array gives the coefficient quantizers in natural array order
jpayne@69 94 * (not the zigzag order in which they are stored in a JPEG DQT marker).
jpayne@69 95 * CAUTION: IJG versions prior to v6a kept this array in zigzag order.
jpayne@69 96 */
jpayne@69 97 UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */
jpayne@69 98 /* This field is used only during compression. It's initialized FALSE when
jpayne@69 99 * the table is created, and set TRUE when it's been output to the file.
jpayne@69 100 * You could suppress output of a table by setting this to TRUE.
jpayne@69 101 * (See jpeg_suppress_tables for an example.)
jpayne@69 102 */
jpayne@69 103 boolean sent_table; /* TRUE when table has been output */
jpayne@69 104 } JQUANT_TBL;
jpayne@69 105
jpayne@69 106
jpayne@69 107 /* Huffman coding tables. */
jpayne@69 108
jpayne@69 109 typedef struct {
jpayne@69 110 /* These two fields directly represent the contents of a JPEG DHT marker */
jpayne@69 111 UINT8 bits[17]; /* bits[k] = # of symbols with codes of */
jpayne@69 112 /* length k bits; bits[0] is unused */
jpayne@69 113 UINT8 huffval[256]; /* The symbols, in order of incr code length */
jpayne@69 114 /* This field is used only during compression. It's initialized FALSE when
jpayne@69 115 * the table is created, and set TRUE when it's been output to the file.
jpayne@69 116 * You could suppress output of a table by setting this to TRUE.
jpayne@69 117 * (See jpeg_suppress_tables for an example.)
jpayne@69 118 */
jpayne@69 119 boolean sent_table; /* TRUE when table has been output */
jpayne@69 120 } JHUFF_TBL;
jpayne@69 121
jpayne@69 122
jpayne@69 123 /* Basic info about one component (color channel). */
jpayne@69 124
jpayne@69 125 typedef struct {
jpayne@69 126 /* These values are fixed over the whole image. */
jpayne@69 127 /* For compression, they must be supplied by parameter setup; */
jpayne@69 128 /* for decompression, they are read from the SOF marker. */
jpayne@69 129 int component_id; /* identifier for this component (0..255) */
jpayne@69 130 int component_index; /* its index in SOF or cinfo->comp_info[] */
jpayne@69 131 int h_samp_factor; /* horizontal sampling factor (1..4) */
jpayne@69 132 int v_samp_factor; /* vertical sampling factor (1..4) */
jpayne@69 133 int quant_tbl_no; /* quantization table selector (0..3) */
jpayne@69 134 /* These values may vary between scans. */
jpayne@69 135 /* For compression, they must be supplied by parameter setup; */
jpayne@69 136 /* for decompression, they are read from the SOS marker. */
jpayne@69 137 /* The decompressor output side may not use these variables. */
jpayne@69 138 int dc_tbl_no; /* DC entropy table selector (0..3) */
jpayne@69 139 int ac_tbl_no; /* AC entropy table selector (0..3) */
jpayne@69 140
jpayne@69 141 /* Remaining fields should be treated as private by applications. */
jpayne@69 142
jpayne@69 143 /* These values are computed during compression or decompression startup: */
jpayne@69 144 /* Component's size in DCT blocks.
jpayne@69 145 * Any dummy blocks added to complete an MCU are not counted; therefore
jpayne@69 146 * these values do not depend on whether a scan is interleaved or not.
jpayne@69 147 */
jpayne@69 148 JDIMENSION width_in_blocks;
jpayne@69 149 JDIMENSION height_in_blocks;
jpayne@69 150 /* Size of a DCT block in samples,
jpayne@69 151 * reflecting any scaling we choose to apply during the DCT step.
jpayne@69 152 * Values from 1 to 16 are supported.
jpayne@69 153 * Note that different components may receive different DCT scalings.
jpayne@69 154 */
jpayne@69 155 int DCT_h_scaled_size;
jpayne@69 156 int DCT_v_scaled_size;
jpayne@69 157 /* The downsampled dimensions are the component's actual, unpadded number
jpayne@69 158 * of samples at the main buffer (preprocessing/compression interface);
jpayne@69 159 * DCT scaling is included, so
jpayne@69 160 * downsampled_width =
jpayne@69 161 * ceil(image_width * Hi/Hmax * DCT_h_scaled_size/block_size)
jpayne@69 162 * and similarly for height.
jpayne@69 163 */
jpayne@69 164 JDIMENSION downsampled_width; /* actual width in samples */
jpayne@69 165 JDIMENSION downsampled_height; /* actual height in samples */
jpayne@69 166 /* For decompression, in cases where some of the components will be
jpayne@69 167 * ignored (eg grayscale output from YCbCr image), we can skip most
jpayne@69 168 * computations for the unused components.
jpayne@69 169 * For compression, some of the components will need further quantization
jpayne@69 170 * scale by factor of 2 after DCT (eg BG_YCC output from normal RGB input).
jpayne@69 171 * The field is first set TRUE for decompression, FALSE for compression
jpayne@69 172 * in initial_setup, and then adapted in color conversion setup.
jpayne@69 173 */
jpayne@69 174 boolean component_needed;
jpayne@69 175
jpayne@69 176 /* These values are computed before starting a scan of the component. */
jpayne@69 177 /* The decompressor output side may not use these variables. */
jpayne@69 178 int MCU_width; /* number of blocks per MCU, horizontally */
jpayne@69 179 int MCU_height; /* number of blocks per MCU, vertically */
jpayne@69 180 int MCU_blocks; /* MCU_width * MCU_height */
jpayne@69 181 int MCU_sample_width; /* MCU width in samples: MCU_width * DCT_h_scaled_size */
jpayne@69 182 int last_col_width; /* # of non-dummy blocks across in last MCU */
jpayne@69 183 int last_row_height; /* # of non-dummy blocks down in last MCU */
jpayne@69 184
jpayne@69 185 /* Saved quantization table for component; NULL if none yet saved.
jpayne@69 186 * See jdinput.c comments about the need for this information.
jpayne@69 187 * This field is currently used only for decompression.
jpayne@69 188 */
jpayne@69 189 JQUANT_TBL * quant_table;
jpayne@69 190
jpayne@69 191 /* Private per-component storage for DCT or IDCT subsystem. */
jpayne@69 192 void * dct_table;
jpayne@69 193 } jpeg_component_info;
jpayne@69 194
jpayne@69 195
jpayne@69 196 /* The script for encoding a multiple-scan file is an array of these: */
jpayne@69 197
jpayne@69 198 typedef struct {
jpayne@69 199 int comps_in_scan; /* number of components encoded in this scan */
jpayne@69 200 int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */
jpayne@69 201 int Ss, Se; /* progressive JPEG spectral selection parms */
jpayne@69 202 int Ah, Al; /* progressive JPEG successive approx. parms */
jpayne@69 203 } jpeg_scan_info;
jpayne@69 204
jpayne@69 205 /* The decompressor can save APPn and COM markers in a list of these: */
jpayne@69 206
jpayne@69 207 typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr;
jpayne@69 208
jpayne@69 209 struct jpeg_marker_struct {
jpayne@69 210 jpeg_saved_marker_ptr next; /* next in list, or NULL */
jpayne@69 211 UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */
jpayne@69 212 unsigned int original_length; /* # bytes of data in the file */
jpayne@69 213 unsigned int data_length; /* # bytes of data saved at data[] */
jpayne@69 214 JOCTET FAR * data; /* the data contained in the marker */
jpayne@69 215 /* the marker length word is not counted in data_length or original_length */
jpayne@69 216 };
jpayne@69 217
jpayne@69 218 /* Known color spaces. */
jpayne@69 219
jpayne@69 220 typedef enum {
jpayne@69 221 JCS_UNKNOWN, /* error/unspecified */
jpayne@69 222 JCS_GRAYSCALE, /* monochrome */
jpayne@69 223 JCS_RGB, /* red/green/blue, standard RGB (sRGB) */
jpayne@69 224 JCS_YCbCr, /* Y/Cb/Cr (also known as YUV), standard YCC */
jpayne@69 225 JCS_CMYK, /* C/M/Y/K */
jpayne@69 226 JCS_YCCK, /* Y/Cb/Cr/K */
jpayne@69 227 JCS_BG_RGB, /* big gamut red/green/blue, bg-sRGB */
jpayne@69 228 JCS_BG_YCC /* big gamut Y/Cb/Cr, bg-sYCC */
jpayne@69 229 } J_COLOR_SPACE;
jpayne@69 230
jpayne@69 231 /* Supported color transforms. */
jpayne@69 232
jpayne@69 233 typedef enum {
jpayne@69 234 JCT_NONE = 0,
jpayne@69 235 JCT_SUBTRACT_GREEN = 1
jpayne@69 236 } J_COLOR_TRANSFORM;
jpayne@69 237
jpayne@69 238 /* DCT/IDCT algorithm options. */
jpayne@69 239
jpayne@69 240 typedef enum {
jpayne@69 241 JDCT_ISLOW, /* slow but accurate integer algorithm */
jpayne@69 242 JDCT_IFAST, /* faster, less accurate integer method */
jpayne@69 243 JDCT_FLOAT /* floating-point: accurate, fast on fast HW */
jpayne@69 244 } J_DCT_METHOD;
jpayne@69 245
jpayne@69 246 #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */
jpayne@69 247 #define JDCT_DEFAULT JDCT_ISLOW
jpayne@69 248 #endif
jpayne@69 249 #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */
jpayne@69 250 #define JDCT_FASTEST JDCT_IFAST
jpayne@69 251 #endif
jpayne@69 252
jpayne@69 253 /* Dithering options for decompression. */
jpayne@69 254
jpayne@69 255 typedef enum {
jpayne@69 256 JDITHER_NONE, /* no dithering */
jpayne@69 257 JDITHER_ORDERED, /* simple ordered dither */
jpayne@69 258 JDITHER_FS /* Floyd-Steinberg error diffusion dither */
jpayne@69 259 } J_DITHER_MODE;
jpayne@69 260
jpayne@69 261
jpayne@69 262 /* Common fields between JPEG compression and decompression master structs. */
jpayne@69 263
jpayne@69 264 #define jpeg_common_fields \
jpayne@69 265 struct jpeg_error_mgr * err; /* Error handler module */\
jpayne@69 266 struct jpeg_memory_mgr * mem; /* Memory manager module */\
jpayne@69 267 struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\
jpayne@69 268 void * client_data; /* Available for use by application */\
jpayne@69 269 boolean is_decompressor; /* So common code can tell which is which */\
jpayne@69 270 int global_state /* For checking call sequence validity */
jpayne@69 271
jpayne@69 272 /* Routines that are to be used by both halves of the library are declared
jpayne@69 273 * to receive a pointer to this structure. There are no actual instances of
jpayne@69 274 * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
jpayne@69 275 */
jpayne@69 276 struct jpeg_common_struct {
jpayne@69 277 jpeg_common_fields; /* Fields common to both master struct types */
jpayne@69 278 /* Additional fields follow in an actual jpeg_compress_struct or
jpayne@69 279 * jpeg_decompress_struct. All three structs must agree on these
jpayne@69 280 * initial fields! (This would be a lot cleaner in C++.)
jpayne@69 281 */
jpayne@69 282 };
jpayne@69 283
jpayne@69 284 typedef struct jpeg_common_struct * j_common_ptr;
jpayne@69 285 typedef struct jpeg_compress_struct * j_compress_ptr;
jpayne@69 286 typedef struct jpeg_decompress_struct * j_decompress_ptr;
jpayne@69 287
jpayne@69 288
jpayne@69 289 /* Master record for a compression instance */
jpayne@69 290
jpayne@69 291 struct jpeg_compress_struct {
jpayne@69 292 jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */
jpayne@69 293
jpayne@69 294 /* Destination for compressed data */
jpayne@69 295 struct jpeg_destination_mgr * dest;
jpayne@69 296
jpayne@69 297 /* Description of source image --- these fields must be filled in by
jpayne@69 298 * outer application before starting compression. in_color_space must
jpayne@69 299 * be correct before you can even call jpeg_set_defaults().
jpayne@69 300 */
jpayne@69 301
jpayne@69 302 JDIMENSION image_width; /* input image width */
jpayne@69 303 JDIMENSION image_height; /* input image height */
jpayne@69 304 int input_components; /* # of color components in input image */
jpayne@69 305 J_COLOR_SPACE in_color_space; /* colorspace of input image */
jpayne@69 306
jpayne@69 307 double input_gamma; /* image gamma of input image */
jpayne@69 308
jpayne@69 309 /* Compression parameters --- these fields must be set before calling
jpayne@69 310 * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to
jpayne@69 311 * initialize everything to reasonable defaults, then changing anything
jpayne@69 312 * the application specifically wants to change. That way you won't get
jpayne@69 313 * burnt when new parameters are added. Also note that there are several
jpayne@69 314 * helper routines to simplify changing parameters.
jpayne@69 315 */
jpayne@69 316
jpayne@69 317 unsigned int scale_num, scale_denom; /* fraction by which to scale image */
jpayne@69 318
jpayne@69 319 JDIMENSION jpeg_width; /* scaled JPEG image width */
jpayne@69 320 JDIMENSION jpeg_height; /* scaled JPEG image height */
jpayne@69 321 /* Dimensions of actual JPEG image that will be written to file,
jpayne@69 322 * derived from input dimensions by scaling factors above.
jpayne@69 323 * These fields are computed by jpeg_start_compress().
jpayne@69 324 * You can also use jpeg_calc_jpeg_dimensions() to determine these values
jpayne@69 325 * in advance of calling jpeg_start_compress().
jpayne@69 326 */
jpayne@69 327
jpayne@69 328 int data_precision; /* bits of precision in image data */
jpayne@69 329
jpayne@69 330 int num_components; /* # of color components in JPEG image */
jpayne@69 331 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
jpayne@69 332
jpayne@69 333 jpeg_component_info * comp_info;
jpayne@69 334 /* comp_info[i] describes component that appears i'th in SOF */
jpayne@69 335
jpayne@69 336 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
jpayne@69 337 int q_scale_factor[NUM_QUANT_TBLS];
jpayne@69 338 /* ptrs to coefficient quantization tables, or NULL if not defined,
jpayne@69 339 * and corresponding scale factors (percentage, initialized 100).
jpayne@69 340 */
jpayne@69 341
jpayne@69 342 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
jpayne@69 343 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
jpayne@69 344 /* ptrs to Huffman coding tables, or NULL if not defined */
jpayne@69 345
jpayne@69 346 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
jpayne@69 347 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
jpayne@69 348 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
jpayne@69 349
jpayne@69 350 int num_scans; /* # of entries in scan_info array */
jpayne@69 351 const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */
jpayne@69 352 /* The default value of scan_info is NULL, which causes a single-scan
jpayne@69 353 * sequential JPEG file to be emitted. To create a multi-scan file,
jpayne@69 354 * set num_scans and scan_info to point to an array of scan definitions.
jpayne@69 355 */
jpayne@69 356
jpayne@69 357 boolean raw_data_in; /* TRUE=caller supplies downsampled data */
jpayne@69 358 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
jpayne@69 359 boolean optimize_coding; /* TRUE=optimize entropy encoding parms */
jpayne@69 360 boolean CCIR601_sampling; /* TRUE=first samples are cosited */
jpayne@69 361 boolean do_fancy_downsampling; /* TRUE=apply fancy downsampling */
jpayne@69 362 int smoothing_factor; /* 1..100, or 0 for no input smoothing */
jpayne@69 363 J_DCT_METHOD dct_method; /* DCT algorithm selector */
jpayne@69 364
jpayne@69 365 /* The restart interval can be specified in absolute MCUs by setting
jpayne@69 366 * restart_interval, or in MCU rows by setting restart_in_rows
jpayne@69 367 * (in which case the correct restart_interval will be figured
jpayne@69 368 * for each scan).
jpayne@69 369 */
jpayne@69 370 unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
jpayne@69 371 int restart_in_rows; /* if > 0, MCU rows per restart interval */
jpayne@69 372
jpayne@69 373 /* Parameters controlling emission of special markers. */
jpayne@69 374
jpayne@69 375 boolean write_JFIF_header; /* should a JFIF marker be written? */
jpayne@69 376 UINT8 JFIF_major_version; /* What to write for the JFIF version number */
jpayne@69 377 UINT8 JFIF_minor_version;
jpayne@69 378 /* These three values are not used by the JPEG code, merely copied */
jpayne@69 379 /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */
jpayne@69 380 /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */
jpayne@69 381 /* ratio is defined by X_density/Y_density even when density_unit=0. */
jpayne@69 382 UINT8 density_unit; /* JFIF code for pixel size units */
jpayne@69 383 UINT16 X_density; /* Horizontal pixel density */
jpayne@69 384 UINT16 Y_density; /* Vertical pixel density */
jpayne@69 385 boolean write_Adobe_marker; /* should an Adobe marker be written? */
jpayne@69 386
jpayne@69 387 J_COLOR_TRANSFORM color_transform;
jpayne@69 388 /* Color transform identifier, writes LSE marker if nonzero */
jpayne@69 389
jpayne@69 390 /* State variable: index of next scanline to be written to
jpayne@69 391 * jpeg_write_scanlines(). Application may use this to control its
jpayne@69 392 * processing loop, e.g., "while (next_scanline < image_height)".
jpayne@69 393 */
jpayne@69 394
jpayne@69 395 JDIMENSION next_scanline; /* 0 .. image_height-1 */
jpayne@69 396
jpayne@69 397 /* Remaining fields are known throughout compressor, but generally
jpayne@69 398 * should not be touched by a surrounding application.
jpayne@69 399 */
jpayne@69 400
jpayne@69 401 /*
jpayne@69 402 * These fields are computed during compression startup
jpayne@69 403 */
jpayne@69 404 boolean progressive_mode; /* TRUE if scan script uses progressive mode */
jpayne@69 405 int max_h_samp_factor; /* largest h_samp_factor */
jpayne@69 406 int max_v_samp_factor; /* largest v_samp_factor */
jpayne@69 407
jpayne@69 408 int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
jpayne@69 409 int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
jpayne@69 410
jpayne@69 411 JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */
jpayne@69 412 /* The coefficient controller receives data in units of MCU rows as defined
jpayne@69 413 * for fully interleaved scans (whether the JPEG file is interleaved or not).
jpayne@69 414 * There are v_samp_factor * DCT_v_scaled_size sample rows of each component
jpayne@69 415 * in an "iMCU" (interleaved MCU) row.
jpayne@69 416 */
jpayne@69 417
jpayne@69 418 /*
jpayne@69 419 * These fields are valid during any one scan.
jpayne@69 420 * They describe the components and MCUs actually appearing in the scan.
jpayne@69 421 */
jpayne@69 422 int comps_in_scan; /* # of JPEG components in this scan */
jpayne@69 423 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
jpayne@69 424 /* *cur_comp_info[i] describes component that appears i'th in SOS */
jpayne@69 425
jpayne@69 426 JDIMENSION MCUs_per_row; /* # of MCUs across the image */
jpayne@69 427 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
jpayne@69 428
jpayne@69 429 int blocks_in_MCU; /* # of DCT blocks per MCU */
jpayne@69 430 int MCU_membership[C_MAX_BLOCKS_IN_MCU];
jpayne@69 431 /* MCU_membership[i] is index in cur_comp_info of component owning */
jpayne@69 432 /* i'th block in an MCU */
jpayne@69 433
jpayne@69 434 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
jpayne@69 435
jpayne@69 436 int block_size; /* the basic DCT block size: 1..16 */
jpayne@69 437 const int * natural_order; /* natural-order position array */
jpayne@69 438 int lim_Se; /* min( Se, DCTSIZE2-1 ) */
jpayne@69 439
jpayne@69 440 /*
jpayne@69 441 * Links to compression subobjects (methods and private variables of modules)
jpayne@69 442 */
jpayne@69 443 struct jpeg_comp_master * master;
jpayne@69 444 struct jpeg_c_main_controller * main;
jpayne@69 445 struct jpeg_c_prep_controller * prep;
jpayne@69 446 struct jpeg_c_coef_controller * coef;
jpayne@69 447 struct jpeg_marker_writer * marker;
jpayne@69 448 struct jpeg_color_converter * cconvert;
jpayne@69 449 struct jpeg_downsampler * downsample;
jpayne@69 450 struct jpeg_forward_dct * fdct;
jpayne@69 451 struct jpeg_entropy_encoder * entropy;
jpayne@69 452 jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */
jpayne@69 453 int script_space_size;
jpayne@69 454 };
jpayne@69 455
jpayne@69 456
jpayne@69 457 /* Master record for a decompression instance */
jpayne@69 458
jpayne@69 459 struct jpeg_decompress_struct {
jpayne@69 460 jpeg_common_fields; /* Fields shared with jpeg_compress_struct */
jpayne@69 461
jpayne@69 462 /* Source of compressed data */
jpayne@69 463 struct jpeg_source_mgr * src;
jpayne@69 464
jpayne@69 465 /* Basic description of image --- filled in by jpeg_read_header(). */
jpayne@69 466 /* Application may inspect these values to decide how to process image. */
jpayne@69 467
jpayne@69 468 JDIMENSION image_width; /* nominal image width (from SOF marker) */
jpayne@69 469 JDIMENSION image_height; /* nominal image height */
jpayne@69 470 int num_components; /* # of color components in JPEG image */
jpayne@69 471 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
jpayne@69 472
jpayne@69 473 /* Decompression processing parameters --- these fields must be set before
jpayne@69 474 * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes
jpayne@69 475 * them to default values.
jpayne@69 476 */
jpayne@69 477
jpayne@69 478 J_COLOR_SPACE out_color_space; /* colorspace for output */
jpayne@69 479
jpayne@69 480 unsigned int scale_num, scale_denom; /* fraction by which to scale image */
jpayne@69 481
jpayne@69 482 double output_gamma; /* image gamma wanted in output */
jpayne@69 483
jpayne@69 484 boolean buffered_image; /* TRUE=multiple output passes */
jpayne@69 485 boolean raw_data_out; /* TRUE=downsampled data wanted */
jpayne@69 486
jpayne@69 487 J_DCT_METHOD dct_method; /* IDCT algorithm selector */
jpayne@69 488 boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */
jpayne@69 489 boolean do_block_smoothing; /* TRUE=apply interblock smoothing */
jpayne@69 490
jpayne@69 491 boolean quantize_colors; /* TRUE=colormapped output wanted */
jpayne@69 492 /* the following are ignored if not quantize_colors: */
jpayne@69 493 J_DITHER_MODE dither_mode; /* type of color dithering to use */
jpayne@69 494 boolean two_pass_quantize; /* TRUE=use two-pass color quantization */
jpayne@69 495 int desired_number_of_colors; /* max # colors to use in created colormap */
jpayne@69 496 /* these are significant only in buffered-image mode: */
jpayne@69 497 boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */
jpayne@69 498 boolean enable_external_quant;/* enable future use of external colormap */
jpayne@69 499 boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */
jpayne@69 500
jpayne@69 501 /* Description of actual output image that will be returned to application.
jpayne@69 502 * These fields are computed by jpeg_start_decompress().
jpayne@69 503 * You can also use jpeg_calc_output_dimensions() to determine these values
jpayne@69 504 * in advance of calling jpeg_start_decompress().
jpayne@69 505 */
jpayne@69 506
jpayne@69 507 JDIMENSION output_width; /* scaled image width */
jpayne@69 508 JDIMENSION output_height; /* scaled image height */
jpayne@69 509 int out_color_components; /* # of color components in out_color_space */
jpayne@69 510 int output_components; /* # of color components returned */
jpayne@69 511 /* output_components is 1 (a colormap index) when quantizing colors;
jpayne@69 512 * otherwise it equals out_color_components.
jpayne@69 513 */
jpayne@69 514 int rec_outbuf_height; /* min recommended height of scanline buffer */
jpayne@69 515 /* If the buffer passed to jpeg_read_scanlines() is less than this many rows
jpayne@69 516 * high, space and time will be wasted due to unnecessary data copying.
jpayne@69 517 * Usually rec_outbuf_height will be 1 or 2, at most 4.
jpayne@69 518 */
jpayne@69 519
jpayne@69 520 /* When quantizing colors, the output colormap is described by these fields.
jpayne@69 521 * The application can supply a colormap by setting colormap non-NULL before
jpayne@69 522 * calling jpeg_start_decompress; otherwise a colormap is created during
jpayne@69 523 * jpeg_start_decompress or jpeg_start_output.
jpayne@69 524 * The map has out_color_components rows and actual_number_of_colors columns.
jpayne@69 525 */
jpayne@69 526 int actual_number_of_colors; /* number of entries in use */
jpayne@69 527 JSAMPARRAY colormap; /* The color map as a 2-D pixel array */
jpayne@69 528
jpayne@69 529 /* State variables: these variables indicate the progress of decompression.
jpayne@69 530 * The application may examine these but must not modify them.
jpayne@69 531 */
jpayne@69 532
jpayne@69 533 /* Row index of next scanline to be read from jpeg_read_scanlines().
jpayne@69 534 * Application may use this to control its processing loop, e.g.,
jpayne@69 535 * "while (output_scanline < output_height)".
jpayne@69 536 */
jpayne@69 537 JDIMENSION output_scanline; /* 0 .. output_height-1 */
jpayne@69 538
jpayne@69 539 /* Current input scan number and number of iMCU rows completed in scan.
jpayne@69 540 * These indicate the progress of the decompressor input side.
jpayne@69 541 */
jpayne@69 542 int input_scan_number; /* Number of SOS markers seen so far */
jpayne@69 543 JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */
jpayne@69 544
jpayne@69 545 /* The "output scan number" is the notional scan being displayed by the
jpayne@69 546 * output side. The decompressor will not allow output scan/row number
jpayne@69 547 * to get ahead of input scan/row, but it can fall arbitrarily far behind.
jpayne@69 548 */
jpayne@69 549 int output_scan_number; /* Nominal scan number being displayed */
jpayne@69 550 JDIMENSION output_iMCU_row; /* Number of iMCU rows read */
jpayne@69 551
jpayne@69 552 /* Current progression status. coef_bits[c][i] indicates the precision
jpayne@69 553 * with which component c's DCT coefficient i (in zigzag order) is known.
jpayne@69 554 * It is -1 when no data has yet been received, otherwise it is the point
jpayne@69 555 * transform (shift) value for the most recent scan of the coefficient
jpayne@69 556 * (thus, 0 at completion of the progression).
jpayne@69 557 * This pointer is NULL when reading a non-progressive file.
jpayne@69 558 */
jpayne@69 559 int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */
jpayne@69 560
jpayne@69 561 /* Internal JPEG parameters --- the application usually need not look at
jpayne@69 562 * these fields. Note that the decompressor output side may not use
jpayne@69 563 * any parameters that can change between scans.
jpayne@69 564 */
jpayne@69 565
jpayne@69 566 /* Quantization and Huffman tables are carried forward across input
jpayne@69 567 * datastreams when processing abbreviated JPEG datastreams.
jpayne@69 568 */
jpayne@69 569
jpayne@69 570 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
jpayne@69 571 /* ptrs to coefficient quantization tables, or NULL if not defined */
jpayne@69 572
jpayne@69 573 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
jpayne@69 574 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
jpayne@69 575 /* ptrs to Huffman coding tables, or NULL if not defined */
jpayne@69 576
jpayne@69 577 /* These parameters are never carried across datastreams, since they
jpayne@69 578 * are given in SOF/SOS markers or defined to be reset by SOI.
jpayne@69 579 */
jpayne@69 580
jpayne@69 581 int data_precision; /* bits of precision in image data */
jpayne@69 582
jpayne@69 583 jpeg_component_info * comp_info;
jpayne@69 584 /* comp_info[i] describes component that appears i'th in SOF */
jpayne@69 585
jpayne@69 586 boolean is_baseline; /* TRUE if Baseline SOF0 encountered */
jpayne@69 587 boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */
jpayne@69 588 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
jpayne@69 589
jpayne@69 590 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
jpayne@69 591 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
jpayne@69 592 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
jpayne@69 593
jpayne@69 594 unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */
jpayne@69 595
jpayne@69 596 /* These fields record data obtained from optional markers recognized by
jpayne@69 597 * the JPEG library.
jpayne@69 598 */
jpayne@69 599 boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */
jpayne@69 600 /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
jpayne@69 601 UINT8 JFIF_major_version; /* JFIF version number */
jpayne@69 602 UINT8 JFIF_minor_version;
jpayne@69 603 UINT8 density_unit; /* JFIF code for pixel size units */
jpayne@69 604 UINT16 X_density; /* Horizontal pixel density */
jpayne@69 605 UINT16 Y_density; /* Vertical pixel density */
jpayne@69 606 boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */
jpayne@69 607 UINT8 Adobe_transform; /* Color transform code from Adobe marker */
jpayne@69 608
jpayne@69 609 J_COLOR_TRANSFORM color_transform;
jpayne@69 610 /* Color transform identifier derived from LSE marker, otherwise zero */
jpayne@69 611
jpayne@69 612 boolean CCIR601_sampling; /* TRUE=first samples are cosited */
jpayne@69 613
jpayne@69 614 /* Aside from the specific data retained from APPn markers known to the
jpayne@69 615 * library, the uninterpreted contents of any or all APPn and COM markers
jpayne@69 616 * can be saved in a list for examination by the application.
jpayne@69 617 */
jpayne@69 618 jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */
jpayne@69 619
jpayne@69 620 /* Remaining fields are known throughout decompressor, but generally
jpayne@69 621 * should not be touched by a surrounding application.
jpayne@69 622 */
jpayne@69 623
jpayne@69 624 /*
jpayne@69 625 * These fields are computed during decompression startup
jpayne@69 626 */
jpayne@69 627 int max_h_samp_factor; /* largest h_samp_factor */
jpayne@69 628 int max_v_samp_factor; /* largest v_samp_factor */
jpayne@69 629
jpayne@69 630 int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
jpayne@69 631 int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
jpayne@69 632
jpayne@69 633 JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */
jpayne@69 634 /* The coefficient controller's input and output progress is measured in
jpayne@69 635 * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows
jpayne@69 636 * in fully interleaved JPEG scans, but are used whether the scan is
jpayne@69 637 * interleaved or not. We define an iMCU row as v_samp_factor DCT block
jpayne@69 638 * rows of each component. Therefore, the IDCT output contains
jpayne@69 639 * v_samp_factor * DCT_v_scaled_size sample rows of a component per iMCU row.
jpayne@69 640 */
jpayne@69 641
jpayne@69 642 JSAMPLE * sample_range_limit; /* table for fast range-limiting */
jpayne@69 643
jpayne@69 644 /*
jpayne@69 645 * These fields are valid during any one scan.
jpayne@69 646 * They describe the components and MCUs actually appearing in the scan.
jpayne@69 647 * Note that the decompressor output side must not use these fields.
jpayne@69 648 */
jpayne@69 649 int comps_in_scan; /* # of JPEG components in this scan */
jpayne@69 650 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
jpayne@69 651 /* *cur_comp_info[i] describes component that appears i'th in SOS */
jpayne@69 652
jpayne@69 653 JDIMENSION MCUs_per_row; /* # of MCUs across the image */
jpayne@69 654 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
jpayne@69 655
jpayne@69 656 int blocks_in_MCU; /* # of DCT blocks per MCU */
jpayne@69 657 int MCU_membership[D_MAX_BLOCKS_IN_MCU];
jpayne@69 658 /* MCU_membership[i] is index in cur_comp_info of component owning */
jpayne@69 659 /* i'th block in an MCU */
jpayne@69 660
jpayne@69 661 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
jpayne@69 662
jpayne@69 663 /* These fields are derived from Se of first SOS marker.
jpayne@69 664 */
jpayne@69 665 int block_size; /* the basic DCT block size: 1..16 */
jpayne@69 666 const int * natural_order; /* natural-order position array for entropy decode */
jpayne@69 667 int lim_Se; /* min( Se, DCTSIZE2-1 ) for entropy decode */
jpayne@69 668
jpayne@69 669 /* This field is shared between entropy decoder and marker parser.
jpayne@69 670 * It is either zero or the code of a JPEG marker that has been
jpayne@69 671 * read from the data source, but has not yet been processed.
jpayne@69 672 */
jpayne@69 673 int unread_marker;
jpayne@69 674
jpayne@69 675 /*
jpayne@69 676 * Links to decompression subobjects (methods, private variables of modules)
jpayne@69 677 */
jpayne@69 678 struct jpeg_decomp_master * master;
jpayne@69 679 struct jpeg_d_main_controller * main;
jpayne@69 680 struct jpeg_d_coef_controller * coef;
jpayne@69 681 struct jpeg_d_post_controller * post;
jpayne@69 682 struct jpeg_input_controller * inputctl;
jpayne@69 683 struct jpeg_marker_reader * marker;
jpayne@69 684 struct jpeg_entropy_decoder * entropy;
jpayne@69 685 struct jpeg_inverse_dct * idct;
jpayne@69 686 struct jpeg_upsampler * upsample;
jpayne@69 687 struct jpeg_color_deconverter * cconvert;
jpayne@69 688 struct jpeg_color_quantizer * cquantize;
jpayne@69 689 };
jpayne@69 690
jpayne@69 691
jpayne@69 692 /* "Object" declarations for JPEG modules that may be supplied or called
jpayne@69 693 * directly by the surrounding application.
jpayne@69 694 * As with all objects in the JPEG library, these structs only define the
jpayne@69 695 * publicly visible methods and state variables of a module. Additional
jpayne@69 696 * private fields may exist after the public ones.
jpayne@69 697 */
jpayne@69 698
jpayne@69 699
jpayne@69 700 /* Error handler object */
jpayne@69 701
jpayne@69 702 struct jpeg_error_mgr {
jpayne@69 703 /* Error exit handler: does not return to caller */
jpayne@69 704 JMETHOD(noreturn_t, error_exit, (j_common_ptr cinfo));
jpayne@69 705 /* Conditionally emit a trace or warning message */
jpayne@69 706 JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
jpayne@69 707 /* Routine that actually outputs a trace or error message */
jpayne@69 708 JMETHOD(void, output_message, (j_common_ptr cinfo));
jpayne@69 709 /* Format a message string for the most recent JPEG error or message */
jpayne@69 710 JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer));
jpayne@69 711 #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */
jpayne@69 712 /* Reset error state variables at start of a new image */
jpayne@69 713 JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));
jpayne@69 714
jpayne@69 715 /* The message ID code and any parameters are saved here.
jpayne@69 716 * A message can have one string parameter or up to 8 int parameters.
jpayne@69 717 */
jpayne@69 718 int msg_code;
jpayne@69 719 #define JMSG_STR_PARM_MAX 80
jpayne@69 720 union {
jpayne@69 721 int i[8];
jpayne@69 722 char s[JMSG_STR_PARM_MAX];
jpayne@69 723 } msg_parm;
jpayne@69 724
jpayne@69 725 /* Standard state variables for error facility */
jpayne@69 726
jpayne@69 727 int trace_level; /* max msg_level that will be displayed */
jpayne@69 728
jpayne@69 729 /* For recoverable corrupt-data errors, we emit a warning message,
jpayne@69 730 * but keep going unless emit_message chooses to abort. emit_message
jpayne@69 731 * should count warnings in num_warnings. The surrounding application
jpayne@69 732 * can check for bad data by seeing if num_warnings is nonzero at the
jpayne@69 733 * end of processing.
jpayne@69 734 */
jpayne@69 735 long num_warnings; /* number of corrupt-data warnings */
jpayne@69 736
jpayne@69 737 /* These fields point to the table(s) of error message strings.
jpayne@69 738 * An application can change the table pointer to switch to a different
jpayne@69 739 * message list (typically, to change the language in which errors are
jpayne@69 740 * reported). Some applications may wish to add additional error codes
jpayne@69 741 * that will be handled by the JPEG library error mechanism; the second
jpayne@69 742 * table pointer is used for this purpose.
jpayne@69 743 *
jpayne@69 744 * First table includes all errors generated by JPEG library itself.
jpayne@69 745 * Error code 0 is reserved for a "no such error string" message.
jpayne@69 746 */
jpayne@69 747 const char * const * jpeg_message_table; /* Library errors */
jpayne@69 748 int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */
jpayne@69 749 /* Second table can be added by application (see cjpeg/djpeg for example).
jpayne@69 750 * It contains strings numbered first_addon_message..last_addon_message.
jpayne@69 751 */
jpayne@69 752 const char * const * addon_message_table; /* Non-library errors */
jpayne@69 753 int first_addon_message; /* code for first string in addon table */
jpayne@69 754 int last_addon_message; /* code for last string in addon table */
jpayne@69 755 };
jpayne@69 756
jpayne@69 757
jpayne@69 758 /* Progress monitor object */
jpayne@69 759
jpayne@69 760 struct jpeg_progress_mgr {
jpayne@69 761 JMETHOD(void, progress_monitor, (j_common_ptr cinfo));
jpayne@69 762
jpayne@69 763 long pass_counter; /* work units completed in this pass */
jpayne@69 764 long pass_limit; /* total number of work units in this pass */
jpayne@69 765 int completed_passes; /* passes completed so far */
jpayne@69 766 int total_passes; /* total number of passes expected */
jpayne@69 767 };
jpayne@69 768
jpayne@69 769
jpayne@69 770 /* Data destination object for compression */
jpayne@69 771
jpayne@69 772 struct jpeg_destination_mgr {
jpayne@69 773 JOCTET * next_output_byte; /* => next byte to write in buffer */
jpayne@69 774 size_t free_in_buffer; /* # of byte spaces remaining in buffer */
jpayne@69 775
jpayne@69 776 JMETHOD(void, init_destination, (j_compress_ptr cinfo));
jpayne@69 777 JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo));
jpayne@69 778 JMETHOD(void, term_destination, (j_compress_ptr cinfo));
jpayne@69 779 };
jpayne@69 780
jpayne@69 781
jpayne@69 782 /* Data source object for decompression */
jpayne@69 783
jpayne@69 784 struct jpeg_source_mgr {
jpayne@69 785 const JOCTET * next_input_byte; /* => next byte to read from buffer */
jpayne@69 786 size_t bytes_in_buffer; /* # of bytes remaining in buffer */
jpayne@69 787
jpayne@69 788 JMETHOD(void, init_source, (j_decompress_ptr cinfo));
jpayne@69 789 JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo));
jpayne@69 790 JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes));
jpayne@69 791 JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired));
jpayne@69 792 JMETHOD(void, term_source, (j_decompress_ptr cinfo));
jpayne@69 793 };
jpayne@69 794
jpayne@69 795
jpayne@69 796 /* Memory manager object.
jpayne@69 797 * Allocates "small" objects (a few K total), "large" objects (tens of K),
jpayne@69 798 * and "really big" objects (virtual arrays with backing store if needed).
jpayne@69 799 * The memory manager does not allow individual objects to be freed; rather,
jpayne@69 800 * each created object is assigned to a pool, and whole pools can be freed
jpayne@69 801 * at once. This is faster and more convenient than remembering exactly what
jpayne@69 802 * to free, especially where malloc()/free() are not too speedy.
jpayne@69 803 * NB: alloc routines never return NULL. They exit to error_exit if not
jpayne@69 804 * successful.
jpayne@69 805 */
jpayne@69 806
jpayne@69 807 #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */
jpayne@69 808 #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */
jpayne@69 809 #define JPOOL_NUMPOOLS 2
jpayne@69 810
jpayne@69 811 typedef struct jvirt_sarray_control * jvirt_sarray_ptr;
jpayne@69 812 typedef struct jvirt_barray_control * jvirt_barray_ptr;
jpayne@69 813
jpayne@69 814
jpayne@69 815 struct jpeg_memory_mgr {
jpayne@69 816 /* Method pointers */
jpayne@69 817 JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id,
jpayne@69 818 size_t sizeofobject));
jpayne@69 819 JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id,
jpayne@69 820 size_t sizeofobject));
jpayne@69 821 JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id,
jpayne@69 822 JDIMENSION samplesperrow,
jpayne@69 823 JDIMENSION numrows));
jpayne@69 824 JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id,
jpayne@69 825 JDIMENSION blocksperrow,
jpayne@69 826 JDIMENSION numrows));
jpayne@69 827 JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo,
jpayne@69 828 int pool_id,
jpayne@69 829 boolean pre_zero,
jpayne@69 830 JDIMENSION samplesperrow,
jpayne@69 831 JDIMENSION numrows,
jpayne@69 832 JDIMENSION maxaccess));
jpayne@69 833 JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo,
jpayne@69 834 int pool_id,
jpayne@69 835 boolean pre_zero,
jpayne@69 836 JDIMENSION blocksperrow,
jpayne@69 837 JDIMENSION numrows,
jpayne@69 838 JDIMENSION maxaccess));
jpayne@69 839 JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo));
jpayne@69 840 JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo,
jpayne@69 841 jvirt_sarray_ptr ptr,
jpayne@69 842 JDIMENSION start_row,
jpayne@69 843 JDIMENSION num_rows,
jpayne@69 844 boolean writable));
jpayne@69 845 JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo,
jpayne@69 846 jvirt_barray_ptr ptr,
jpayne@69 847 JDIMENSION start_row,
jpayne@69 848 JDIMENSION num_rows,
jpayne@69 849 boolean writable));
jpayne@69 850 JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id));
jpayne@69 851 JMETHOD(void, self_destruct, (j_common_ptr cinfo));
jpayne@69 852
jpayne@69 853 /* Limit on memory allocation for this JPEG object. (Note that this is
jpayne@69 854 * merely advisory, not a guaranteed maximum; it only affects the space
jpayne@69 855 * used for virtual-array buffers.) May be changed by outer application
jpayne@69 856 * after creating the JPEG object.
jpayne@69 857 */
jpayne@69 858 long max_memory_to_use;
jpayne@69 859
jpayne@69 860 /* Maximum allocation request accepted by alloc_large. */
jpayne@69 861 long max_alloc_chunk;
jpayne@69 862 };
jpayne@69 863
jpayne@69 864
jpayne@69 865 /* Routine signature for application-supplied marker processing methods.
jpayne@69 866 * Need not pass marker code since it is stored in cinfo->unread_marker.
jpayne@69 867 */
jpayne@69 868 typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
jpayne@69 869
jpayne@69 870
jpayne@69 871 /* Declarations for routines called by application.
jpayne@69 872 * The JPP macro hides prototype parameters from compilers that can't cope.
jpayne@69 873 * Note JPP requires double parentheses.
jpayne@69 874 */
jpayne@69 875
jpayne@69 876 #ifdef HAVE_PROTOTYPES
jpayne@69 877 #define JPP(arglist) arglist
jpayne@69 878 #else
jpayne@69 879 #define JPP(arglist) ()
jpayne@69 880 #endif
jpayne@69 881
jpayne@69 882
jpayne@69 883 /* Short forms of external names for systems with brain-damaged linkers.
jpayne@69 884 * We shorten external names to be unique in the first six letters, which
jpayne@69 885 * is good enough for all known systems.
jpayne@69 886 * (If your compiler itself needs names to be unique in less than 15
jpayne@69 887 * characters, you are out of luck. Get a better compiler.)
jpayne@69 888 */
jpayne@69 889
jpayne@69 890 #ifdef NEED_SHORT_EXTERNAL_NAMES
jpayne@69 891 #define jpeg_std_error jStdError
jpayne@69 892 #define jpeg_CreateCompress jCreaCompress
jpayne@69 893 #define jpeg_CreateDecompress jCreaDecompress
jpayne@69 894 #define jpeg_destroy_compress jDestCompress
jpayne@69 895 #define jpeg_destroy_decompress jDestDecompress
jpayne@69 896 #define jpeg_stdio_dest jStdDest
jpayne@69 897 #define jpeg_stdio_src jStdSrc
jpayne@69 898 #define jpeg_mem_dest jMemDest
jpayne@69 899 #define jpeg_mem_src jMemSrc
jpayne@69 900 #define jpeg_set_defaults jSetDefaults
jpayne@69 901 #define jpeg_set_colorspace jSetColorspace
jpayne@69 902 #define jpeg_default_colorspace jDefColorspace
jpayne@69 903 #define jpeg_set_quality jSetQuality
jpayne@69 904 #define jpeg_set_linear_quality jSetLQuality
jpayne@69 905 #define jpeg_default_qtables jDefQTables
jpayne@69 906 #define jpeg_add_quant_table jAddQuantTable
jpayne@69 907 #define jpeg_quality_scaling jQualityScaling
jpayne@69 908 #define jpeg_simple_progression jSimProgress
jpayne@69 909 #define jpeg_suppress_tables jSuppressTables
jpayne@69 910 #define jpeg_alloc_quant_table jAlcQTable
jpayne@69 911 #define jpeg_alloc_huff_table jAlcHTable
jpayne@69 912 #define jpeg_std_huff_table jStdHTable
jpayne@69 913 #define jpeg_start_compress jStrtCompress
jpayne@69 914 #define jpeg_write_scanlines jWrtScanlines
jpayne@69 915 #define jpeg_finish_compress jFinCompress
jpayne@69 916 #define jpeg_calc_jpeg_dimensions jCjpegDimensions
jpayne@69 917 #define jpeg_write_raw_data jWrtRawData
jpayne@69 918 #define jpeg_write_marker jWrtMarker
jpayne@69 919 #define jpeg_write_m_header jWrtMHeader
jpayne@69 920 #define jpeg_write_m_byte jWrtMByte
jpayne@69 921 #define jpeg_write_tables jWrtTables
jpayne@69 922 #define jpeg_read_header jReadHeader
jpayne@69 923 #define jpeg_start_decompress jStrtDecompress
jpayne@69 924 #define jpeg_read_scanlines jReadScanlines
jpayne@69 925 #define jpeg_finish_decompress jFinDecompress
jpayne@69 926 #define jpeg_read_raw_data jReadRawData
jpayne@69 927 #define jpeg_has_multiple_scans jHasMultScn
jpayne@69 928 #define jpeg_start_output jStrtOutput
jpayne@69 929 #define jpeg_finish_output jFinOutput
jpayne@69 930 #define jpeg_input_complete jInComplete
jpayne@69 931 #define jpeg_new_colormap jNewCMap
jpayne@69 932 #define jpeg_consume_input jConsumeInput
jpayne@69 933 #define jpeg_core_output_dimensions jCoreDimensions
jpayne@69 934 #define jpeg_calc_output_dimensions jCalcDimensions
jpayne@69 935 #define jpeg_save_markers jSaveMarkers
jpayne@69 936 #define jpeg_set_marker_processor jSetMarker
jpayne@69 937 #define jpeg_read_coefficients jReadCoefs
jpayne@69 938 #define jpeg_write_coefficients jWrtCoefs
jpayne@69 939 #define jpeg_copy_critical_parameters jCopyCrit
jpayne@69 940 #define jpeg_abort_compress jAbrtCompress
jpayne@69 941 #define jpeg_abort_decompress jAbrtDecompress
jpayne@69 942 #define jpeg_abort jAbort
jpayne@69 943 #define jpeg_destroy jDestroy
jpayne@69 944 #define jpeg_resync_to_restart jResyncRestart
jpayne@69 945 #endif /* NEED_SHORT_EXTERNAL_NAMES */
jpayne@69 946
jpayne@69 947
jpayne@69 948 /* Default error-management setup */
jpayne@69 949 EXTERN(struct jpeg_error_mgr *) jpeg_std_error
jpayne@69 950 JPP((struct jpeg_error_mgr * err));
jpayne@69 951
jpayne@69 952 /* Initialization of JPEG compression objects.
jpayne@69 953 * jpeg_create_compress() and jpeg_create_decompress() are the exported
jpayne@69 954 * names that applications should call. These expand to calls on
jpayne@69 955 * jpeg_CreateCompress and jpeg_CreateDecompress with additional information
jpayne@69 956 * passed for version mismatch checking.
jpayne@69 957 * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
jpayne@69 958 */
jpayne@69 959 #define jpeg_create_compress(cinfo) \
jpayne@69 960 jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
jpayne@69 961 (size_t) sizeof(struct jpeg_compress_struct))
jpayne@69 962 #define jpeg_create_decompress(cinfo) \
jpayne@69 963 jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
jpayne@69 964 (size_t) sizeof(struct jpeg_decompress_struct))
jpayne@69 965 EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo,
jpayne@69 966 int version, size_t structsize));
jpayne@69 967 EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo,
jpayne@69 968 int version, size_t structsize));
jpayne@69 969 /* Destruction of JPEG compression objects */
jpayne@69 970 EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo));
jpayne@69 971 EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));
jpayne@69 972
jpayne@69 973 /* Standard data source and destination managers: stdio streams. */
jpayne@69 974 /* Caller is responsible for opening the file before and closing after. */
jpayne@69 975 EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
jpayne@69 976 EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile));
jpayne@69 977
jpayne@69 978 /* Data source and destination managers: memory buffers. */
jpayne@69 979 EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo,
jpayne@69 980 unsigned char ** outbuffer,
jpayne@69 981 size_t * outsize));
jpayne@69 982 EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo,
jpayne@69 983 const unsigned char * inbuffer,
jpayne@69 984 size_t insize));
jpayne@69 985
jpayne@69 986 /* Default parameter setup for compression */
jpayne@69 987 EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo));
jpayne@69 988 /* Compression parameter setup aids */
jpayne@69 989 EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo,
jpayne@69 990 J_COLOR_SPACE colorspace));
jpayne@69 991 EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo));
jpayne@69 992 EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality,
jpayne@69 993 boolean force_baseline));
jpayne@69 994 EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo,
jpayne@69 995 int scale_factor,
jpayne@69 996 boolean force_baseline));
jpayne@69 997 EXTERN(void) jpeg_default_qtables JPP((j_compress_ptr cinfo,
jpayne@69 998 boolean force_baseline));
jpayne@69 999 EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl,
jpayne@69 1000 const unsigned int *basic_table,
jpayne@69 1001 int scale_factor,
jpayne@69 1002 boolean force_baseline));
jpayne@69 1003 EXTERN(int) jpeg_quality_scaling JPP((int quality));
jpayne@69 1004 EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo));
jpayne@69 1005 EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo,
jpayne@69 1006 boolean suppress));
jpayne@69 1007 EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo));
jpayne@69 1008 EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo));
jpayne@69 1009 EXTERN(JHUFF_TBL *) jpeg_std_huff_table JPP((j_common_ptr cinfo,
jpayne@69 1010 boolean isDC, int tblno));
jpayne@69 1011
jpayne@69 1012 /* Main entry points for compression */
jpayne@69 1013 EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo,
jpayne@69 1014 boolean write_all_tables));
jpayne@69 1015 EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo,
jpayne@69 1016 JSAMPARRAY scanlines,
jpayne@69 1017 JDIMENSION num_lines));
jpayne@69 1018 EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo));
jpayne@69 1019
jpayne@69 1020 /* Precalculate JPEG dimensions for current compression parameters. */
jpayne@69 1021 EXTERN(void) jpeg_calc_jpeg_dimensions JPP((j_compress_ptr cinfo));
jpayne@69 1022
jpayne@69 1023 /* Replaces jpeg_write_scanlines when writing raw downsampled data. */
jpayne@69 1024 EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo,
jpayne@69 1025 JSAMPIMAGE data,
jpayne@69 1026 JDIMENSION num_lines));
jpayne@69 1027
jpayne@69 1028 /* Write a special marker. See libjpeg.txt concerning safe usage. */
jpayne@69 1029 EXTERN(void) jpeg_write_marker
jpayne@69 1030 JPP((j_compress_ptr cinfo, int marker,
jpayne@69 1031 const JOCTET * dataptr, unsigned int datalen));
jpayne@69 1032 /* Same, but piecemeal. */
jpayne@69 1033 EXTERN(void) jpeg_write_m_header
jpayne@69 1034 JPP((j_compress_ptr cinfo, int marker, unsigned int datalen));
jpayne@69 1035 EXTERN(void) jpeg_write_m_byte
jpayne@69 1036 JPP((j_compress_ptr cinfo, int val));
jpayne@69 1037
jpayne@69 1038 /* Alternate compression function: just write an abbreviated table file */
jpayne@69 1039 EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo));
jpayne@69 1040
jpayne@69 1041 /* Decompression startup: read start of JPEG datastream to see what's there */
jpayne@69 1042 EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo,
jpayne@69 1043 boolean require_image));
jpayne@69 1044 /* Return value is one of: */
jpayne@69 1045 #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */
jpayne@69 1046 #define JPEG_HEADER_OK 1 /* Found valid image datastream */
jpayne@69 1047 #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */
jpayne@69 1048 /* If you pass require_image = TRUE (normal case), you need not check for
jpayne@69 1049 * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
jpayne@69 1050 * JPEG_SUSPENDED is only possible if you use a data source module that can
jpayne@69 1051 * give a suspension return (the stdio source module doesn't).
jpayne@69 1052 */
jpayne@69 1053
jpayne@69 1054 /* Main entry points for decompression */
jpayne@69 1055 EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo));
jpayne@69 1056 EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo,
jpayne@69 1057 JSAMPARRAY scanlines,
jpayne@69 1058 JDIMENSION max_lines));
jpayne@69 1059 EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo));
jpayne@69 1060
jpayne@69 1061 /* Replaces jpeg_read_scanlines when reading raw downsampled data. */
jpayne@69 1062 EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo,
jpayne@69 1063 JSAMPIMAGE data,
jpayne@69 1064 JDIMENSION max_lines));
jpayne@69 1065
jpayne@69 1066 /* Additional entry points for buffered-image mode. */
jpayne@69 1067 EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo));
jpayne@69 1068 EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo,
jpayne@69 1069 int scan_number));
jpayne@69 1070 EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo));
jpayne@69 1071 EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo));
jpayne@69 1072 EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo));
jpayne@69 1073 EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo));
jpayne@69 1074 /* Return value is one of: */
jpayne@69 1075 /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */
jpayne@69 1076 #define JPEG_REACHED_SOS 1 /* Reached start of new scan */
jpayne@69 1077 #define JPEG_REACHED_EOI 2 /* Reached end of image */
jpayne@69 1078 #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */
jpayne@69 1079 #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */
jpayne@69 1080
jpayne@69 1081 /* Precalculate output dimensions for current decompression parameters. */
jpayne@69 1082 EXTERN(void) jpeg_core_output_dimensions JPP((j_decompress_ptr cinfo));
jpayne@69 1083 EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
jpayne@69 1084
jpayne@69 1085 /* Control saving of COM and APPn markers into marker_list. */
jpayne@69 1086 EXTERN(void) jpeg_save_markers
jpayne@69 1087 JPP((j_decompress_ptr cinfo, int marker_code,
jpayne@69 1088 unsigned int length_limit));
jpayne@69 1089
jpayne@69 1090 /* Install a special processing method for COM or APPn markers. */
jpayne@69 1091 EXTERN(void) jpeg_set_marker_processor
jpayne@69 1092 JPP((j_decompress_ptr cinfo, int marker_code,
jpayne@69 1093 jpeg_marker_parser_method routine));
jpayne@69 1094
jpayne@69 1095 /* Read or write raw DCT coefficients --- useful for lossless transcoding. */
jpayne@69 1096 EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
jpayne@69 1097 EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo,
jpayne@69 1098 jvirt_barray_ptr * coef_arrays));
jpayne@69 1099 EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo,
jpayne@69 1100 j_compress_ptr dstinfo));
jpayne@69 1101
jpayne@69 1102 /* If you choose to abort compression or decompression before completing
jpayne@69 1103 * jpeg_finish_(de)compress, then you need to clean up to release memory,
jpayne@69 1104 * temporary files, etc. You can just call jpeg_destroy_(de)compress
jpayne@69 1105 * if you're done with the JPEG object, but if you want to clean it up and
jpayne@69 1106 * reuse it, call this:
jpayne@69 1107 */
jpayne@69 1108 EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo));
jpayne@69 1109 EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo));
jpayne@69 1110
jpayne@69 1111 /* Generic versions of jpeg_abort and jpeg_destroy that work on either
jpayne@69 1112 * flavor of JPEG object. These may be more convenient in some places.
jpayne@69 1113 */
jpayne@69 1114 EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo));
jpayne@69 1115 EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo));
jpayne@69 1116
jpayne@69 1117 /* Default restart-marker-resync procedure for use by data source modules */
jpayne@69 1118 EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo,
jpayne@69 1119 int desired));
jpayne@69 1120
jpayne@69 1121
jpayne@69 1122 /* These marker codes are exported since applications and data source modules
jpayne@69 1123 * are likely to want to use them.
jpayne@69 1124 */
jpayne@69 1125
jpayne@69 1126 #define JPEG_RST0 0xD0 /* RST0 marker code */
jpayne@69 1127 #define JPEG_EOI 0xD9 /* EOI marker code */
jpayne@69 1128 #define JPEG_APP0 0xE0 /* APP0 marker code */
jpayne@69 1129 #define JPEG_COM 0xFE /* COM marker code */
jpayne@69 1130
jpayne@69 1131
jpayne@69 1132 /* If we have a brain-damaged compiler that emits warnings (or worse, errors)
jpayne@69 1133 * for structure definitions that are never filled in, keep it quiet by
jpayne@69 1134 * supplying dummy definitions for the various substructures.
jpayne@69 1135 */
jpayne@69 1136
jpayne@69 1137 #ifdef INCOMPLETE_TYPES_BROKEN
jpayne@69 1138 #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */
jpayne@69 1139 struct jvirt_sarray_control { long dummy; };
jpayne@69 1140 struct jvirt_barray_control { long dummy; };
jpayne@69 1141 struct jpeg_comp_master { long dummy; };
jpayne@69 1142 struct jpeg_c_main_controller { long dummy; };
jpayne@69 1143 struct jpeg_c_prep_controller { long dummy; };
jpayne@69 1144 struct jpeg_c_coef_controller { long dummy; };
jpayne@69 1145 struct jpeg_marker_writer { long dummy; };
jpayne@69 1146 struct jpeg_color_converter { long dummy; };
jpayne@69 1147 struct jpeg_downsampler { long dummy; };
jpayne@69 1148 struct jpeg_forward_dct { long dummy; };
jpayne@69 1149 struct jpeg_entropy_encoder { long dummy; };
jpayne@69 1150 struct jpeg_decomp_master { long dummy; };
jpayne@69 1151 struct jpeg_d_main_controller { long dummy; };
jpayne@69 1152 struct jpeg_d_coef_controller { long dummy; };
jpayne@69 1153 struct jpeg_d_post_controller { long dummy; };
jpayne@69 1154 struct jpeg_input_controller { long dummy; };
jpayne@69 1155 struct jpeg_marker_reader { long dummy; };
jpayne@69 1156 struct jpeg_entropy_decoder { long dummy; };
jpayne@69 1157 struct jpeg_inverse_dct { long dummy; };
jpayne@69 1158 struct jpeg_upsampler { long dummy; };
jpayne@69 1159 struct jpeg_color_deconverter { long dummy; };
jpayne@69 1160 struct jpeg_color_quantizer { long dummy; };
jpayne@69 1161 #endif /* JPEG_INTERNALS */
jpayne@69 1162 #endif /* INCOMPLETE_TYPES_BROKEN */
jpayne@69 1163
jpayne@69 1164
jpayne@69 1165 /*
jpayne@69 1166 * The JPEG library modules define JPEG_INTERNALS before including this file.
jpayne@69 1167 * The internal structure declarations are read only when that is true.
jpayne@69 1168 * Applications using the library should not include jpegint.h, but may wish
jpayne@69 1169 * to include jerror.h.
jpayne@69 1170 */
jpayne@69 1171
jpayne@69 1172 #ifdef JPEG_INTERNALS
jpayne@69 1173 #include "jpegint.h" /* fetch private declarations */
jpayne@69 1174 #include "jerror.h" /* fetch error codes too */
jpayne@69 1175 #endif
jpayne@69 1176
jpayne@69 1177 #ifdef __cplusplus
jpayne@69 1178 #ifndef DONT_USE_EXTERN_C
jpayne@69 1179 }
jpayne@69 1180 #endif
jpayne@69 1181 #endif
jpayne@69 1182
jpayne@69 1183 #endif /* JPEGLIB_H */