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1/*
2 * jpeglib.h
3 *
4 * Copyright (C) 1991-1998, Thomas G. Lane.
5 * Modified 2002-2011 by Guido Vollbeding.
6 * This file is part of the Independent JPEG Group's software.
7 * For conditions of distribution and use, see the accompanying README file.
8 *
9 * This file defines the application interface for the JPEG library.
10 * Most applications using the library need only include this file,
11 * and perhaps jerror.h if they want to know the exact error codes.
12 */
13
14#ifndef JPEGLIB_H
15#define JPEGLIB_H
16
17/*
18 * First we include the configuration files that record how this
19 * installation of the JPEG library is set up. jconfig.h can be
20 * generated automatically for many systems. jmorecfg.h contains
21 * manual configuration options that most people need not worry about.
22 */
23
24#ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */
25#include "jconfig.h" /* widely used configuration options */
26#endif
27#include "jmorecfg.h" /* seldom changed options */
28
29
30#ifdef __cplusplus
31#ifndef DONT_USE_EXTERN_C
32extern "C" {
33#endif
34#endif
35
36/* Version IDs for the JPEG library.
37 * Might be useful for tests like "#if JPEG_LIB_VERSION >= 80".
38 */
39
40#define JPEG_LIB_VERSION 80 /* Compatibility version 8.0 */
41#define JPEG_LIB_VERSION_MAJOR 8
42#define JPEG_LIB_VERSION_MINOR 4
43
44
45/* Various constants determining the sizes of things.
46 * All of these are specified by the JPEG standard, so don't change them
47 * if you want to be compatible.
48 */
49
50#define DCTSIZE 8 /* The basic DCT block is 8x8 coefficients */
51#define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */
52#define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */
53#define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */
54#define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */
55#define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */
56#define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */
57/* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
58 * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
59 * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
60 * to handle it. We even let you do this from the jconfig.h file. However,
61 * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
62 * sometimes emits noncompliant files doesn't mean you should too.
63 */
64#define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */
65#ifndef D_MAX_BLOCKS_IN_MCU
66#define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */
67#endif
68
69
70/* Data structures for images (arrays of samples and of DCT coefficients).
71 * On 80x86 machines, the image arrays are too big for near pointers,
72 * but the pointer arrays can fit in near memory.
73 */
74
75typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */
76typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */
77typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */
78
79typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */
80typedef JBLOCK FAR *JBLOCKROW; /* pointer to one row of coefficient blocks */
81typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */
82typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */
83
84typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */
85
86
87/* Types for JPEG compression parameters and working tables. */
88
89
90/* DCT coefficient quantization tables. */
91
92typedef struct {
93 /* This array gives the coefficient quantizers in natural array order
94 * (not the zigzag order in which they are stored in a JPEG DQT marker).
95 * CAUTION: IJG versions prior to v6a kept this array in zigzag order.
96 */
97 UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */
98 /* This field is used only during compression. It's initialized FALSE when
99 * the table is created, and set TRUE when it's been output to the file.
100 * You could suppress output of a table by setting this to TRUE.
101 * (See jpeg_suppress_tables for an example.)
102 */
103 boolean sent_table; /* TRUE when table has been output */
104} JQUANT_TBL;
105
106
107/* Huffman coding tables. */
108
109typedef struct {
110 /* These two fields directly represent the contents of a JPEG DHT marker */
111 UINT8 bits[17]; /* bits[k] = # of symbols with codes of */
112 /* length k bits; bits[0] is unused */
113 UINT8 huffval[256]; /* The symbols, in order of incr code length */
114 /* This field is used only during compression. It's initialized FALSE when
115 * the table is created, and set TRUE when it's been output to the file.
116 * You could suppress output of a table by setting this to TRUE.
117 * (See jpeg_suppress_tables for an example.)
118 */
119 boolean sent_table; /* TRUE when table has been output */
120} JHUFF_TBL;
121
122
123/* Basic info about one component (color channel). */
124
125typedef struct {
126 /* These values are fixed over the whole image. */
127 /* For compression, they must be supplied by parameter setup; */
128 /* for decompression, they are read from the SOF marker. */
129 int component_id; /* identifier for this component (0..255) */
130 int component_index; /* its index in SOF or cinfo->comp_info[] */
131 int h_samp_factor; /* horizontal sampling factor (1..4) */
132 int v_samp_factor; /* vertical sampling factor (1..4) */
133 int quant_tbl_no; /* quantization table selector (0..3) */
134 /* These values may vary between scans. */
135 /* For compression, they must be supplied by parameter setup; */
136 /* for decompression, they are read from the SOS marker. */
137 /* The decompressor output side may not use these variables. */
138 int dc_tbl_no; /* DC entropy table selector (0..3) */
139 int ac_tbl_no; /* AC entropy table selector (0..3) */
140
141 /* Remaining fields should be treated as private by applications. */
142
143 /* These values are computed during compression or decompression startup: */
144 /* Component's size in DCT blocks.
145 * Any dummy blocks added to complete an MCU are not counted; therefore
146 * these values do not depend on whether a scan is interleaved or not.
147 */
148 JDIMENSION width_in_blocks;
149 JDIMENSION height_in_blocks;
150 /* Size of a DCT block in samples,
151 * reflecting any scaling we choose to apply during the DCT step.
152 * Values from 1 to 16 are supported.
153 * Note that different components may receive different DCT scalings.
154 */
155 int DCT_h_scaled_size;
156 int DCT_v_scaled_size;
157 /* The downsampled dimensions are the component's actual, unpadded number
158 * of samples at the main buffer (preprocessing/compression interface);
159 * DCT scaling is included, so
160 * downsampled_width = ceil(image_width * Hi/Hmax * DCT_h_scaled_size/DCTSIZE)
161 * and similarly for height.
162 */
163 JDIMENSION downsampled_width; /* actual width in samples */
164 JDIMENSION downsampled_height; /* actual height in samples */
165 /* This flag is used only for decompression. In cases where some of the
166 * components will be ignored (eg grayscale output from YCbCr image),
167 * we can skip most computations for the unused components.
168 */
169 boolean component_needed; /* do we need the value of this component? */
170
171 /* These values are computed before starting a scan of the component. */
172 /* The decompressor output side may not use these variables. */
173 int MCU_width; /* number of blocks per MCU, horizontally */
174 int MCU_height; /* number of blocks per MCU, vertically */
175 int MCU_blocks; /* MCU_width * MCU_height */
176 int MCU_sample_width; /* MCU width in samples: MCU_width * DCT_h_scaled_size */
177 int last_col_width; /* # of non-dummy blocks across in last MCU */
178 int last_row_height; /* # of non-dummy blocks down in last MCU */
179
180 /* Saved quantization table for component; NULL if none yet saved.
181 * See jdinput.c comments about the need for this information.
182 * This field is currently used only for decompression.
183 */
184 JQUANT_TBL * quant_table;
185
186 /* Private per-component storage for DCT or IDCT subsystem. */
187 void * dct_table;
188} jpeg_component_info;
189
190
191/* The script for encoding a multiple-scan file is an array of these: */
192
193typedef struct {
194 int comps_in_scan; /* number of components encoded in this scan */
195 int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */
196 int Ss, Se; /* progressive JPEG spectral selection parms */
197 int Ah, Al; /* progressive JPEG successive approx. parms */
198} jpeg_scan_info;
199
200/* The decompressor can save APPn and COM markers in a list of these: */
201
202typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr;
203
204struct jpeg_marker_struct {
205 jpeg_saved_marker_ptr next; /* next in list, or NULL */
206 UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */
207 unsigned int original_length; /* # bytes of data in the file */
208 unsigned int data_length; /* # bytes of data saved at data[] */
209 JOCTET FAR * data; /* the data contained in the marker */
210 /* the marker length word is not counted in data_length or original_length */
211};
212
213/* Known color spaces. */
214
215typedef enum {
216 JCS_UNKNOWN, /* error/unspecified */
217 JCS_GRAYSCALE, /* monochrome */
218 JCS_RGB, /* red/green/blue */
219 JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */
220 JCS_CMYK, /* C/M/Y/K */
221 JCS_YCCK /* Y/Cb/Cr/K */
222} J_COLOR_SPACE;
223
224/* DCT/IDCT algorithm options. */
225
226typedef enum {
227 JDCT_ISLOW, /* slow but accurate integer algorithm */
228 JDCT_IFAST, /* faster, less accurate integer method */
229 JDCT_FLOAT /* floating-point: accurate, fast on fast HW */
230} J_DCT_METHOD;
231
232#ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */
233#define JDCT_DEFAULT JDCT_ISLOW
234#endif
235#ifndef JDCT_FASTEST /* may be overridden in jconfig.h */
236#define JDCT_FASTEST JDCT_IFAST
237#endif
238
239/* Dithering options for decompression. */
240
241typedef enum {
242 JDITHER_NONE, /* no dithering */
243 JDITHER_ORDERED, /* simple ordered dither */
244 JDITHER_FS /* Floyd-Steinberg error diffusion dither */
245} J_DITHER_MODE;
246
247
248/* Common fields between JPEG compression and decompression master structs. */
249
250#define jpeg_common_fields \
251 struct jpeg_error_mgr * err; /* Error handler module */\
252 struct jpeg_memory_mgr * mem; /* Memory manager module */\
253 struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\
254 void * client_data; /* Available for use by application */\
255 boolean is_decompressor; /* So common code can tell which is which */\
256 int global_state /* For checking call sequence validity */
257
258/* Routines that are to be used by both halves of the library are declared
259 * to receive a pointer to this structure. There are no actual instances of
260 * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
261 */
262struct jpeg_common_struct {
263 jpeg_common_fields; /* Fields common to both master struct types */
264 /* Additional fields follow in an actual jpeg_compress_struct or
265 * jpeg_decompress_struct. All three structs must agree on these
266 * initial fields! (This would be a lot cleaner in C++.)
267 */
268};
269
270typedef struct jpeg_common_struct * j_common_ptr;
271typedef struct jpeg_compress_struct * j_compress_ptr;
272typedef struct jpeg_decompress_struct * j_decompress_ptr;
273
274
275/* Master record for a compression instance */
276
277struct jpeg_compress_struct {
278 jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */
279
280 /* Destination for compressed data */
281 struct jpeg_destination_mgr * dest;
282
283 /* Description of source image --- these fields must be filled in by
284 * outer application before starting compression. in_color_space must
285 * be correct before you can even call jpeg_set_defaults().
286 */
287
288 JDIMENSION image_width; /* input image width */
289 JDIMENSION image_height; /* input image height */
290 int input_components; /* # of color components in input image */
291 J_COLOR_SPACE in_color_space; /* colorspace of input image */
292
293 double input_gamma; /* image gamma of input image */
294
295 /* Compression parameters --- these fields must be set before calling
296 * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to
297 * initialize everything to reasonable defaults, then changing anything
298 * the application specifically wants to change. That way you won't get
299 * burnt when new parameters are added. Also note that there are several
300 * helper routines to simplify changing parameters.
301 */
302
303 unsigned int scale_num, scale_denom; /* fraction by which to scale image */
304
305 JDIMENSION jpeg_width; /* scaled JPEG image width */
306 JDIMENSION jpeg_height; /* scaled JPEG image height */
307 /* Dimensions of actual JPEG image that will be written to file,
308 * derived from input dimensions by scaling factors above.
309 * These fields are computed by jpeg_start_compress().
310 * You can also use jpeg_calc_jpeg_dimensions() to determine these values
311 * in advance of calling jpeg_start_compress().
312 */
313
314 int data_precision; /* bits of precision in image data */
315
316 int num_components; /* # of color components in JPEG image */
317 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
318
319 jpeg_component_info * comp_info;
320 /* comp_info[i] describes component that appears i'th in SOF */
321
322 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
323 int q_scale_factor[NUM_QUANT_TBLS];
324 /* ptrs to coefficient quantization tables, or NULL if not defined,
325 * and corresponding scale factors (percentage, initialized 100).
326 */
327
328 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
329 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
330 /* ptrs to Huffman coding tables, or NULL if not defined */
331
332 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
333 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
334 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
335
336 int num_scans; /* # of entries in scan_info array */
337 const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */
338 /* The default value of scan_info is NULL, which causes a single-scan
339 * sequential JPEG file to be emitted. To create a multi-scan file,
340 * set num_scans and scan_info to point to an array of scan definitions.
341 */
342
343 boolean raw_data_in; /* TRUE=caller supplies downsampled data */
344 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
345 boolean optimize_coding; /* TRUE=optimize entropy encoding parms */
346 boolean CCIR601_sampling; /* TRUE=first samples are cosited */
347 boolean do_fancy_downsampling; /* TRUE=apply fancy downsampling */
348 int smoothing_factor; /* 1..100, or 0 for no input smoothing */
349 J_DCT_METHOD dct_method; /* DCT algorithm selector */
350
351 /* The restart interval can be specified in absolute MCUs by setting
352 * restart_interval, or in MCU rows by setting restart_in_rows
353 * (in which case the correct restart_interval will be figured
354 * for each scan).
355 */
356 unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
357 int restart_in_rows; /* if > 0, MCU rows per restart interval */
358
359 /* Parameters controlling emission of special markers. */
360
361 boolean write_JFIF_header; /* should a JFIF marker be written? */
362 UINT8 JFIF_major_version; /* What to write for the JFIF version number */
363 UINT8 JFIF_minor_version;
364 /* These three values are not used by the JPEG code, merely copied */
365 /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */
366 /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */
367 /* ratio is defined by X_density/Y_density even when density_unit=0. */
368 UINT8 density_unit; /* JFIF code for pixel size units */
369 UINT16 X_density; /* Horizontal pixel density */
370 UINT16 Y_density; /* Vertical pixel density */
371 boolean write_Adobe_marker; /* should an Adobe marker be written? */
372
373 /* State variable: index of next scanline to be written to
374 * jpeg_write_scanlines(). Application may use this to control its
375 * processing loop, e.g., "while (next_scanline < image_height)".
376 */
377
378 JDIMENSION next_scanline; /* 0 .. image_height-1 */
379
380 /* Remaining fields are known throughout compressor, but generally
381 * should not be touched by a surrounding application.
382 */
383
384 /*
385 * These fields are computed during compression startup
386 */
387 boolean progressive_mode; /* TRUE if scan script uses progressive mode */
388 int max_h_samp_factor; /* largest h_samp_factor */
389 int max_v_samp_factor; /* largest v_samp_factor */
390
391 int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
392 int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
393
394 JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */
395 /* The coefficient controller receives data in units of MCU rows as defined
396 * for fully interleaved scans (whether the JPEG file is interleaved or not).
397 * There are v_samp_factor * DCTSIZE sample rows of each component in an
398 * "iMCU" (interleaved MCU) row.
399 */
400
401 /*
402 * These fields are valid during any one scan.
403 * They describe the components and MCUs actually appearing in the scan.
404 */
405 int comps_in_scan; /* # of JPEG components in this scan */
406 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
407 /* *cur_comp_info[i] describes component that appears i'th in SOS */
408
409 JDIMENSION MCUs_per_row; /* # of MCUs across the image */
410 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
411
412 int blocks_in_MCU; /* # of DCT blocks per MCU */
413 int MCU_membership[C_MAX_BLOCKS_IN_MCU];
414 /* MCU_membership[i] is index in cur_comp_info of component owning */
415 /* i'th block in an MCU */
416
417 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
418
419 int block_size; /* the basic DCT block size: 1..16 */
420 const int * natural_order; /* natural-order position array */
421 int lim_Se; /* min( Se, DCTSIZE2-1 ) */
422
423 /*
424 * Links to compression subobjects (methods and private variables of modules)
425 */
426 struct jpeg_comp_master * master;
427 struct jpeg_c_main_controller * main;
428 struct jpeg_c_prep_controller * prep;
429 struct jpeg_c_coef_controller * coef;
430 struct jpeg_marker_writer * marker;
431 struct jpeg_color_converter * cconvert;
432 struct jpeg_downsampler * downsample;
433 struct jpeg_forward_dct * fdct;
434 struct jpeg_entropy_encoder * entropy;
435 jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */
436 int script_space_size;
437};
438
439
440/* Master record for a decompression instance */
441
442struct jpeg_decompress_struct {
443 jpeg_common_fields; /* Fields shared with jpeg_compress_struct */
444
445 /* Source of compressed data */
446 struct jpeg_source_mgr * src;
447
448 /* Basic description of image --- filled in by jpeg_read_header(). */
449 /* Application may inspect these values to decide how to process image. */
450
451 JDIMENSION image_width; /* nominal image width (from SOF marker) */
452 JDIMENSION image_height; /* nominal image height */
453 int num_components; /* # of color components in JPEG image */
454 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
455
456 /* Decompression processing parameters --- these fields must be set before
457 * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes
458 * them to default values.
459 */
460
461 J_COLOR_SPACE out_color_space; /* colorspace for output */
462
463 unsigned int scale_num, scale_denom; /* fraction by which to scale image */
464
465 double output_gamma; /* image gamma wanted in output */
466
467 boolean buffered_image; /* TRUE=multiple output passes */
468 boolean raw_data_out; /* TRUE=downsampled data wanted */
469
470 J_DCT_METHOD dct_method; /* IDCT algorithm selector */
471 boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */
472 boolean do_block_smoothing; /* TRUE=apply interblock smoothing */
473
474 boolean quantize_colors; /* TRUE=colormapped output wanted */
475 /* the following are ignored if not quantize_colors: */
476 J_DITHER_MODE dither_mode; /* type of color dithering to use */
477 boolean two_pass_quantize; /* TRUE=use two-pass color quantization */
478 int desired_number_of_colors; /* max # colors to use in created colormap */
479 /* these are significant only in buffered-image mode: */
480 boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */
481 boolean enable_external_quant;/* enable future use of external colormap */
482 boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */
483
484 /* Description of actual output image that will be returned to application.
485 * These fields are computed by jpeg_start_decompress().
486 * You can also use jpeg_calc_output_dimensions() to determine these values
487 * in advance of calling jpeg_start_decompress().
488 */
489
490 JDIMENSION output_width; /* scaled image width */
491 JDIMENSION output_height; /* scaled image height */
492 int out_color_components; /* # of color components in out_color_space */
493 int output_components; /* # of color components returned */
494 /* output_components is 1 (a colormap index) when quantizing colors;
495 * otherwise it equals out_color_components.
496 */
497 int rec_outbuf_height; /* min recommended height of scanline buffer */
498 /* If the buffer passed to jpeg_read_scanlines() is less than this many rows
499 * high, space and time will be wasted due to unnecessary data copying.
500 * Usually rec_outbuf_height will be 1 or 2, at most 4.
501 */
502
503 /* When quantizing colors, the output colormap is described by these fields.
504 * The application can supply a colormap by setting colormap non-NULL before
505 * calling jpeg_start_decompress; otherwise a colormap is created during
506 * jpeg_start_decompress or jpeg_start_output.
507 * The map has out_color_components rows and actual_number_of_colors columns.
508 */
509 int actual_number_of_colors; /* number of entries in use */
510 JSAMPARRAY colormap; /* The color map as a 2-D pixel array */
511
512 /* State variables: these variables indicate the progress of decompression.
513 * The application may examine these but must not modify them.
514 */
515
516 /* Row index of next scanline to be read from jpeg_read_scanlines().
517 * Application may use this to control its processing loop, e.g.,
518 * "while (output_scanline < output_height)".
519 */
520 JDIMENSION output_scanline; /* 0 .. output_height-1 */
521
522 /* Current input scan number and number of iMCU rows completed in scan.
523 * These indicate the progress of the decompressor input side.
524 */
525 int input_scan_number; /* Number of SOS markers seen so far */
526 JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */
527
528 /* The "output scan number" is the notional scan being displayed by the
529 * output side. The decompressor will not allow output scan/row number
530 * to get ahead of input scan/row, but it can fall arbitrarily far behind.
531 */
532 int output_scan_number; /* Nominal scan number being displayed */
533 JDIMENSION output_iMCU_row; /* Number of iMCU rows read */
534
535 /* Current progression status. coef_bits[c][i] indicates the precision
536 * with which component c's DCT coefficient i (in zigzag order) is known.
537 * It is -1 when no data has yet been received, otherwise it is the point
538 * transform (shift) value for the most recent scan of the coefficient
539 * (thus, 0 at completion of the progression).
540 * This pointer is NULL when reading a non-progressive file.
541 */
542 int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */
543
544 /* Internal JPEG parameters --- the application usually need not look at
545 * these fields. Note that the decompressor output side may not use
546 * any parameters that can change between scans.
547 */
548
549 /* Quantization and Huffman tables are carried forward across input
550 * datastreams when processing abbreviated JPEG datastreams.
551 */
552
553 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
554 /* ptrs to coefficient quantization tables, or NULL if not defined */
555
556 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
557 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
558 /* ptrs to Huffman coding tables, or NULL if not defined */
559
560 /* These parameters are never carried across datastreams, since they
561 * are given in SOF/SOS markers or defined to be reset by SOI.
562 */
563
564 int data_precision; /* bits of precision in image data */
565
566 jpeg_component_info * comp_info;
567 /* comp_info[i] describes component that appears i'th in SOF */
568
569 boolean is_baseline; /* TRUE if Baseline SOF0 encountered */
570 boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */
571 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
572
573 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
574 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
575 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
576
577 unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */
578
579 /* These fields record data obtained from optional markers recognized by
580 * the JPEG library.
581 */
582 boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */
583 /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
584 UINT8 JFIF_major_version; /* JFIF version number */
585 UINT8 JFIF_minor_version;
586 UINT8 density_unit; /* JFIF code for pixel size units */
587 UINT16 X_density; /* Horizontal pixel density */
588 UINT16 Y_density; /* Vertical pixel density */
589 boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */
590 UINT8 Adobe_transform; /* Color transform code from Adobe marker */
591
592 boolean CCIR601_sampling; /* TRUE=first samples are cosited */
593
594 /* Aside from the specific data retained from APPn markers known to the
595 * library, the uninterpreted contents of any or all APPn and COM markers
596 * can be saved in a list for examination by the application.
597 */
598 jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */
599
600 /* Remaining fields are known throughout decompressor, but generally
601 * should not be touched by a surrounding application.
602 */
603
604 /*
605 * These fields are computed during decompression startup
606 */
607 int max_h_samp_factor; /* largest h_samp_factor */
608 int max_v_samp_factor; /* largest v_samp_factor */
609
610 int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
611 int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
612
613 JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */
614 /* The coefficient controller's input and output progress is measured in
615 * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows
616 * in fully interleaved JPEG scans, but are used whether the scan is
617 * interleaved or not. We define an iMCU row as v_samp_factor DCT block
618 * rows of each component. Therefore, the IDCT output contains
619 * v_samp_factor*DCT_v_scaled_size sample rows of a component per iMCU row.
620 */
621
622 JSAMPLE * sample_range_limit; /* table for fast range-limiting */
623
624 /*
625 * These fields are valid during any one scan.
626 * They describe the components and MCUs actually appearing in the scan.
627 * Note that the decompressor output side must not use these fields.
628 */
629 int comps_in_scan; /* # of JPEG components in this scan */
630 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
631 /* *cur_comp_info[i] describes component that appears i'th in SOS */
632
633 JDIMENSION MCUs_per_row; /* # of MCUs across the image */
634 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
635
636 int blocks_in_MCU; /* # of DCT blocks per MCU */
637 int MCU_membership[D_MAX_BLOCKS_IN_MCU];
638 /* MCU_membership[i] is index in cur_comp_info of component owning */
639 /* i'th block in an MCU */
640
641 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
642
643 /* These fields are derived from Se of first SOS marker.
644 */
645 int block_size; /* the basic DCT block size: 1..16 */
646 const int * natural_order; /* natural-order position array for entropy decode */
647 int lim_Se; /* min( Se, DCTSIZE2-1 ) for entropy decode */
648
649 /* This field is shared between entropy decoder and marker parser.
650 * It is either zero or the code of a JPEG marker that has been
651 * read from the data source, but has not yet been processed.
652 */
653 int unread_marker;
654
655 /*
656 * Links to decompression subobjects (methods, private variables of modules)
657 */
658 struct jpeg_decomp_master * master;
659 struct jpeg_d_main_controller * main;
660 struct jpeg_d_coef_controller * coef;
661 struct jpeg_d_post_controller * post;
662 struct jpeg_input_controller * inputctl;
663 struct jpeg_marker_reader * marker;
664 struct jpeg_entropy_decoder * entropy;
665 struct jpeg_inverse_dct * idct;
666 struct jpeg_upsampler * upsample;
667 struct jpeg_color_deconverter * cconvert;
668 struct jpeg_color_quantizer * cquantize;
669};
670
671
672/* "Object" declarations for JPEG modules that may be supplied or called
673 * directly by the surrounding application.
674 * As with all objects in the JPEG library, these structs only define the
675 * publicly visible methods and state variables of a module. Additional
676 * private fields may exist after the public ones.
677 */
678
679
680/* Error handler object */
681
682struct jpeg_error_mgr {
683 /* Error exit handler: does not return to caller */
684 JMETHOD(void, error_exit, (j_common_ptr cinfo));
685 /* Conditionally emit a trace or warning message */
686 JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
687 /* Routine that actually outputs a trace or error message */
688 JMETHOD(void, output_message, (j_common_ptr cinfo));
689 /* Format a message string for the most recent JPEG error or message */
690 JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer));
691#define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */
692 /* Reset error state variables at start of a new image */
693 JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));
694
695 /* The message ID code and any parameters are saved here.
696 * A message can have one string parameter or up to 8 int parameters.
697 */
698 int msg_code;
699#define JMSG_STR_PARM_MAX 80
700 union {
701 int i[8];
702 char s[JMSG_STR_PARM_MAX];
703 } msg_parm;
704
705 /* Standard state variables for error facility */
706
707 int trace_level; /* max msg_level that will be displayed */
708
709 /* For recoverable corrupt-data errors, we emit a warning message,
710 * but keep going unless emit_message chooses to abort. emit_message
711 * should count warnings in num_warnings. The surrounding application
712 * can check for bad data by seeing if num_warnings is nonzero at the
713 * end of processing.
714 */
715 long num_warnings; /* number of corrupt-data warnings */
716
717 /* These fields point to the table(s) of error message strings.
718 * An application can change the table pointer to switch to a different
719 * message list (typically, to change the language in which errors are
720 * reported). Some applications may wish to add additional error codes
721 * that will be handled by the JPEG library error mechanism; the second
722 * table pointer is used for this purpose.
723 *
724 * First table includes all errors generated by JPEG library itself.
725 * Error code 0 is reserved for a "no such error string" message.
726 */
727 const char * const * jpeg_message_table; /* Library errors */
728 int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */
729 /* Second table can be added by application (see cjpeg/djpeg for example).
730 * It contains strings numbered first_addon_message..last_addon_message.
731 */
732 const char * const * addon_message_table; /* Non-library errors */
733 int first_addon_message; /* code for first string in addon table */
734 int last_addon_message; /* code for last string in addon table */
735};
736
737
738/* Progress monitor object */
739
740struct jpeg_progress_mgr {
741 JMETHOD(void, progress_monitor, (j_common_ptr cinfo));
742
743 long pass_counter; /* work units completed in this pass */
744 long pass_limit; /* total number of work units in this pass */
745 int completed_passes; /* passes completed so far */
746 int total_passes; /* total number of passes expected */
747};
748
749
750/* Data destination object for compression */
751
752struct jpeg_destination_mgr {
753 JOCTET * next_output_byte; /* => next byte to write in buffer */
754 size_t free_in_buffer; /* # of byte spaces remaining in buffer */
755
756 JMETHOD(void, init_destination, (j_compress_ptr cinfo));
757 JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo));
758 JMETHOD(void, term_destination, (j_compress_ptr cinfo));
759};
760
761
762/* Data source object for decompression */
763
764struct jpeg_source_mgr {
765 const JOCTET * next_input_byte; /* => next byte to read from buffer */
766 size_t bytes_in_buffer; /* # of bytes remaining in buffer */
767
768 JMETHOD(void, init_source, (j_decompress_ptr cinfo));
769 JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo));
770 JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes));
771 JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired));
772 JMETHOD(void, term_source, (j_decompress_ptr cinfo));
773};
774
775
776/* Memory manager object.
777 * Allocates "small" objects (a few K total), "large" objects (tens of K),
778 * and "really big" objects (virtual arrays with backing store if needed).
779 * The memory manager does not allow individual objects to be freed; rather,
780 * each created object is assigned to a pool, and whole pools can be freed
781 * at once. This is faster and more convenient than remembering exactly what
782 * to free, especially where malloc()/free() are not too speedy.
783 * NB: alloc routines never return NULL. They exit to error_exit if not
784 * successful.
785 */
786
787#define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */
788#define JPOOL_IMAGE 1 /* lasts until done with image/datastream */
789#define JPOOL_NUMPOOLS 2
790
791typedef struct jvirt_sarray_control * jvirt_sarray_ptr;
792typedef struct jvirt_barray_control * jvirt_barray_ptr;
793
794
795struct jpeg_memory_mgr {
796 /* Method pointers */
797 JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id,
798 size_t sizeofobject));
799 JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id,
800 size_t sizeofobject));
801 JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id,
802 JDIMENSION samplesperrow,
803 JDIMENSION numrows));
804 JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id,
805 JDIMENSION blocksperrow,
806 JDIMENSION numrows));
807 JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo,
808 int pool_id,
809 boolean pre_zero,
810 JDIMENSION samplesperrow,
811 JDIMENSION numrows,
812 JDIMENSION maxaccess));
813 JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo,
814 int pool_id,
815 boolean pre_zero,
816 JDIMENSION blocksperrow,
817 JDIMENSION numrows,
818 JDIMENSION maxaccess));
819 JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo));
820 JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo,
821 jvirt_sarray_ptr ptr,
822 JDIMENSION start_row,
823 JDIMENSION num_rows,
824 boolean writable));
825 JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo,
826 jvirt_barray_ptr ptr,
827 JDIMENSION start_row,
828 JDIMENSION num_rows,
829 boolean writable));
830 JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id));
831 JMETHOD(void, self_destruct, (j_common_ptr cinfo));
832
833 /* Limit on memory allocation for this JPEG object. (Note that this is
834 * merely advisory, not a guaranteed maximum; it only affects the space
835 * used for virtual-array buffers.) May be changed by outer application
836 * after creating the JPEG object.
837 */
838 long max_memory_to_use;
839
840 /* Maximum allocation request accepted by alloc_large. */
841 long max_alloc_chunk;
842};
843
844
845/* Routine signature for application-supplied marker processing methods.
846 * Need not pass marker code since it is stored in cinfo->unread_marker.
847 */
848typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
849
850
851/* Declarations for routines called by application.
852 * The JPP macro hides prototype parameters from compilers that can't cope.
853 * Note JPP requires double parentheses.
854 */
855
856#ifdef HAVE_PROTOTYPES
857#define JPP(arglist) arglist
858#else
859#define JPP(arglist) ()
860#endif
861
862
863/* Short forms of external names for systems with brain-damaged linkers.
864 * We shorten external names to be unique in the first six letters, which
865 * is good enough for all known systems.
866 * (If your compiler itself needs names to be unique in less than 15
867 * characters, you are out of luck. Get a better compiler.)
868 */
869
870#ifdef NEED_SHORT_EXTERNAL_NAMES
871#define jpeg_std_error jStdError
872#define jpeg_CreateCompress jCreaCompress
873#define jpeg_CreateDecompress jCreaDecompress
874#define jpeg_destroy_compress jDestCompress
875#define jpeg_destroy_decompress jDestDecompress
876#define jpeg_stdio_dest jStdDest
877#define jpeg_stdio_src jStdSrc
878#define jpeg_mem_dest jMemDest
879#define jpeg_mem_src jMemSrc
880#define jpeg_set_defaults jSetDefaults
881#define jpeg_set_colorspace jSetColorspace
882#define jpeg_default_colorspace jDefColorspace
883#define jpeg_set_quality jSetQuality
884#define jpeg_set_linear_quality jSetLQuality
885#define jpeg_default_qtables jDefQTables
886#define jpeg_add_quant_table jAddQuantTable
887#define jpeg_quality_scaling jQualityScaling
888#define jpeg_simple_progression jSimProgress
889#define jpeg_suppress_tables jSuppressTables
890#define jpeg_alloc_quant_table jAlcQTable
891#define jpeg_alloc_huff_table jAlcHTable
892#define jpeg_start_compress jStrtCompress
893#define jpeg_write_scanlines jWrtScanlines
894#define jpeg_finish_compress jFinCompress
895#define jpeg_calc_jpeg_dimensions jCjpegDimensions
896#define jpeg_write_raw_data jWrtRawData
897#define jpeg_write_marker jWrtMarker
898#define jpeg_write_m_header jWrtMHeader
899#define jpeg_write_m_byte jWrtMByte
900#define jpeg_write_tables jWrtTables
901#define jpeg_read_header jReadHeader
902#define jpeg_start_decompress jStrtDecompress
903#define jpeg_read_scanlines jReadScanlines
904#define jpeg_finish_decompress jFinDecompress
905#define jpeg_read_raw_data jReadRawData
906#define jpeg_has_multiple_scans jHasMultScn
907#define jpeg_start_output jStrtOutput
908#define jpeg_finish_output jFinOutput
909#define jpeg_input_complete jInComplete
910#define jpeg_new_colormap jNewCMap
911#define jpeg_consume_input jConsumeInput
912#define jpeg_core_output_dimensions jCoreDimensions
913#define jpeg_calc_output_dimensions jCalcDimensions
914#define jpeg_save_markers jSaveMarkers
915#define jpeg_set_marker_processor jSetMarker
916#define jpeg_read_coefficients jReadCoefs
917#define jpeg_write_coefficients jWrtCoefs
918#define jpeg_copy_critical_parameters jCopyCrit
919#define jpeg_abort_compress jAbrtCompress
920#define jpeg_abort_decompress jAbrtDecompress
921#define jpeg_abort jAbort
922#define jpeg_destroy jDestroy
923#define jpeg_resync_to_restart jResyncRestart
924#endif /* NEED_SHORT_EXTERNAL_NAMES */
925
926
927/* Default error-management setup */
928EXTERN(struct jpeg_error_mgr *) jpeg_std_error
929 JPP((struct jpeg_error_mgr * err));
930
931/* Initialization of JPEG compression objects.
932 * jpeg_create_compress() and jpeg_create_decompress() are the exported
933 * names that applications should call. These expand to calls on
934 * jpeg_CreateCompress and jpeg_CreateDecompress with additional information
935 * passed for version mismatch checking.
936 * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
937 */
938#define jpeg_create_compress(cinfo) \
939 jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
940 (size_t) sizeof(struct jpeg_compress_struct))
941#define jpeg_create_decompress(cinfo) \
942 jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
943 (size_t) sizeof(struct jpeg_decompress_struct))
944EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo,
945 int version, size_t structsize));
946EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo,
947 int version, size_t structsize));
948/* Destruction of JPEG compression objects */
949EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo));
950EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));
951
952/* Standard data source and destination managers: stdio streams. */
953/* Caller is responsible for opening the file before and closing after. */
954EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
955EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile));
956
957/* Data source and destination managers: memory buffers. */
958EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo,
959 unsigned char ** outbuffer,
960 unsigned long * outsize));
961EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo,
962 unsigned char * inbuffer,
963 unsigned long insize));
964
965/* Default parameter setup for compression */
966EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo));
967/* Compression parameter setup aids */
968EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo,
969 J_COLOR_SPACE colorspace));
970EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo));
971EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality,
972 boolean force_baseline));
973EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo,
974 int scale_factor,
975 boolean force_baseline));
976EXTERN(void) jpeg_default_qtables JPP((j_compress_ptr cinfo,
977 boolean force_baseline));
978EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl,
979 const unsigned int *basic_table,
980 int scale_factor,
981 boolean force_baseline));
982EXTERN(int) jpeg_quality_scaling JPP((int quality));
983EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo));
984EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo,
985 boolean suppress));
986EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo));
987EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo));
988
989/* Main entry points for compression */
990EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo,
991 boolean write_all_tables));
992EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo,
993 JSAMPARRAY scanlines,
994 JDIMENSION num_lines));
995EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo));
996
997/* Precalculate JPEG dimensions for current compression parameters. */
998EXTERN(void) jpeg_calc_jpeg_dimensions JPP((j_compress_ptr cinfo));
999
1000/* Replaces jpeg_write_scanlines when writing raw downsampled data. */
1001EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo,
1002 JSAMPIMAGE data,
1003 JDIMENSION num_lines));
1004
1005/* Write a special marker. See libjpeg.txt concerning safe usage. */
1006EXTERN(void) jpeg_write_marker
1007 JPP((j_compress_ptr cinfo, int marker,
1008 const JOCTET * dataptr, unsigned int datalen));
1009/* Same, but piecemeal. */
1010EXTERN(void) jpeg_write_m_header
1011 JPP((j_compress_ptr cinfo, int marker, unsigned int datalen));
1012EXTERN(void) jpeg_write_m_byte
1013 JPP((j_compress_ptr cinfo, int val));
1014
1015/* Alternate compression function: just write an abbreviated table file */
1016EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo));
1017
1018/* Decompression startup: read start of JPEG datastream to see what's there */
1019EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo,
1020 boolean require_image));
1021/* Return value is one of: */
1022#define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */
1023#define JPEG_HEADER_OK 1 /* Found valid image datastream */
1024#define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */
1025/* If you pass require_image = TRUE (normal case), you need not check for
1026 * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
1027 * JPEG_SUSPENDED is only possible if you use a data source module that can
1028 * give a suspension return (the stdio source module doesn't).
1029 */
1030
1031/* Main entry points for decompression */
1032EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo));
1033EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo,
1034 JSAMPARRAY scanlines,
1035 JDIMENSION max_lines));
1036EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo));
1037
1038/* Replaces jpeg_read_scanlines when reading raw downsampled data. */
1039EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo,
1040 JSAMPIMAGE data,
1041 JDIMENSION max_lines));
1042
1043/* Additional entry points for buffered-image mode. */
1044EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo));
1045EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo,
1046 int scan_number));
1047EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo));
1048EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo));
1049EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo));
1050EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo));
1051/* Return value is one of: */
1052/* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */
1053#define JPEG_REACHED_SOS 1 /* Reached start of new scan */
1054#define JPEG_REACHED_EOI 2 /* Reached end of image */
1055#define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */
1056#define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */
1057
1058/* Precalculate output dimensions for current decompression parameters. */
1059EXTERN(void) jpeg_core_output_dimensions JPP((j_decompress_ptr cinfo));
1060EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
1061
1062/* Control saving of COM and APPn markers into marker_list. */
1063EXTERN(void) jpeg_save_markers
1064 JPP((j_decompress_ptr cinfo, int marker_code,
1065 unsigned int length_limit));
1066
1067/* Install a special processing method for COM or APPn markers. */
1068EXTERN(void) jpeg_set_marker_processor
1069 JPP((j_decompress_ptr cinfo, int marker_code,
1070 jpeg_marker_parser_method routine));
1071
1072/* Read or write raw DCT coefficients --- useful for lossless transcoding. */
1073EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
1074EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo,
1075 jvirt_barray_ptr * coef_arrays));
1076EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo,
1077 j_compress_ptr dstinfo));
1078
1079/* If you choose to abort compression or decompression before completing
1080 * jpeg_finish_(de)compress, then you need to clean up to release memory,
1081 * temporary files, etc. You can just call jpeg_destroy_(de)compress
1082 * if you're done with the JPEG object, but if you want to clean it up and
1083 * reuse it, call this:
1084 */
1085EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo));
1086EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo));
1087
1088/* Generic versions of jpeg_abort and jpeg_destroy that work on either
1089 * flavor of JPEG object. These may be more convenient in some places.
1090 */
1091EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo));
1092EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo));
1093
1094/* Default restart-marker-resync procedure for use by data source modules */
1095EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo,
1096 int desired));
1097
1098
1099/* These marker codes are exported since applications and data source modules
1100 * are likely to want to use them.
1101 */
1102
1103#define JPEG_RST0 0xD0 /* RST0 marker code */
1104#define JPEG_EOI 0xD9 /* EOI marker code */
1105#define JPEG_APP0 0xE0 /* APP0 marker code */
1106#define JPEG_COM 0xFE /* COM marker code */
1107
1108
1109/* If we have a brain-damaged compiler that emits warnings (or worse, errors)
1110 * for structure definitions that are never filled in, keep it quiet by
1111 * supplying dummy definitions for the various substructures.
1112 */
1113
1114#ifdef INCOMPLETE_TYPES_BROKEN
1115#ifndef JPEG_INTERNALS /* will be defined in jpegint.h */
1116struct jvirt_sarray_control { long dummy; };
1117struct jvirt_barray_control { long dummy; };
1118struct jpeg_comp_master { long dummy; };
1119struct jpeg_c_main_controller { long dummy; };
1120struct jpeg_c_prep_controller { long dummy; };
1121struct jpeg_c_coef_controller { long dummy; };
1122struct jpeg_marker_writer { long dummy; };
1123struct jpeg_color_converter { long dummy; };
1124struct jpeg_downsampler { long dummy; };
1125struct jpeg_forward_dct { long dummy; };
1126struct jpeg_entropy_encoder { long dummy; };
1127struct jpeg_decomp_master { long dummy; };
1128struct jpeg_d_main_controller { long dummy; };
1129struct jpeg_d_coef_controller { long dummy; };
1130struct jpeg_d_post_controller { long dummy; };
1131struct jpeg_input_controller { long dummy; };
1132struct jpeg_marker_reader { long dummy; };
1133struct jpeg_entropy_decoder { long dummy; };
1134struct jpeg_inverse_dct { long dummy; };
1135struct jpeg_upsampler { long dummy; };
1136struct jpeg_color_deconverter { long dummy; };
1137struct jpeg_color_quantizer { long dummy; };
1138#endif /* JPEG_INTERNALS */
1139#endif /* INCOMPLETE_TYPES_BROKEN */
1140
1141
1142/*
1143 * The JPEG library modules define JPEG_INTERNALS before including this file.
1144 * The internal structure declarations are read only when that is true.
1145 * Applications using the library should not include jpegint.h, but may wish
1146 * to include jerror.h.
1147 */
1148
1149#ifdef JPEG_INTERNALS
1150#include "jpegint.h" /* fetch private declarations */
1151#include "jerror.h" /* fetch error codes too */
1152#endif
1153
1154#ifdef __cplusplus
1155#ifndef DONT_USE_EXTERN_C
1156}
1157#endif
1158#endif
1159
1160#endif /* JPEGLIB_H */
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