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