4
* Copyright (C) 1991-1998, Thomas G. Lane.
5
* Modified 2002-2012 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.
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.
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.
24
#ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */
25
#include "jconfig.h" /* widely used configuration options */
27
#include "jmorecfg.h" /* seldom changed options */
31
#ifndef DONT_USE_EXTERN_C
36
/* Version IDs for the JPEG library.
37
* Might be useful for tests like "#if JPEG_LIB_VERSION >= 90".
40
#define JPEG_LIB_VERSION 90 /* Compatibility version 9.0 */
41
#define JPEG_LIB_VERSION_MAJOR 9
42
#define JPEG_LIB_VERSION_MINOR 0
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.
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.
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 */
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.
75
typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */
76
typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */
77
typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */
79
typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */
80
typedef JBLOCK FAR *JBLOCKROW; /* pointer to one row of coefficient blocks */
81
typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */
82
typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */
84
typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */
87
/* Types for JPEG compression parameters and working tables. */
90
/* DCT coefficient quantization tables. */
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.
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.)
103
boolean sent_table; /* TRUE when table has been output */
107
/* Huffman coding tables. */
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.)
119
boolean sent_table; /* TRUE when table has been output */
123
/* Basic info about one component (color channel). */
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) */
141
/* Remaining fields should be treated as private by applications. */
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.
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.
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.
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.
169
boolean component_needed; /* do we need the value of this component? */
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 */
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.
184
JQUANT_TBL * quant_table;
186
/* Private per-component storage for DCT or IDCT subsystem. */
188
} jpeg_component_info;
191
/* The script for encoding a multiple-scan file is an array of these: */
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 */
200
/* The decompressor can save APPn and COM markers in a list of these: */
202
typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr;
204
struct 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 */
213
/* Known color spaces. */
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 */
224
/* Supported color transforms. */
228
JCT_SUBTRACT_GREEN = 1
231
/* DCT/IDCT algorithm options. */
234
JDCT_ISLOW, /* slow but accurate integer algorithm */
235
JDCT_IFAST, /* faster, less accurate integer method */
236
JDCT_FLOAT /* floating-point: accurate, fast on fast HW */
239
#ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */
240
#define JDCT_DEFAULT JDCT_ISLOW
242
#ifndef JDCT_FASTEST /* may be overridden in jconfig.h */
243
#define JDCT_FASTEST JDCT_IFAST
246
/* Dithering options for decompression. */
249
JDITHER_NONE, /* no dithering */
250
JDITHER_ORDERED, /* simple ordered dither */
251
JDITHER_FS /* Floyd-Steinberg error diffusion dither */
255
/* Common fields between JPEG compression and decompression master structs. */
257
#define jpeg_common_fields \
258
struct jpeg_error_mgr * err; /* Error handler module */\
259
struct jpeg_memory_mgr * mem; /* Memory manager module */\
260
struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\
261
void * client_data; /* Available for use by application */\
262
boolean is_decompressor; /* So common code can tell which is which */\
263
int global_state /* For checking call sequence validity */
265
/* Routines that are to be used by both halves of the library are declared
266
* to receive a pointer to this structure. There are no actual instances of
267
* jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
269
struct jpeg_common_struct {
270
jpeg_common_fields; /* Fields common to both master struct types */
271
/* Additional fields follow in an actual jpeg_compress_struct or
272
* jpeg_decompress_struct. All three structs must agree on these
273
* initial fields! (This would be a lot cleaner in C++.)
277
typedef struct jpeg_common_struct * j_common_ptr;
278
typedef struct jpeg_compress_struct * j_compress_ptr;
279
typedef struct jpeg_decompress_struct * j_decompress_ptr;
282
/* Master record for a compression instance */
284
struct jpeg_compress_struct {
285
jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */
287
/* Destination for compressed data */
288
struct jpeg_destination_mgr * dest;
290
/* Description of source image --- these fields must be filled in by
291
* outer application before starting compression. in_color_space must
292
* be correct before you can even call jpeg_set_defaults().
295
JDIMENSION image_width; /* input image width */
296
JDIMENSION image_height; /* input image height */
297
int input_components; /* # of color components in input image */
298
J_COLOR_SPACE in_color_space; /* colorspace of input image */
300
double input_gamma; /* image gamma of input image */
302
/* Compression parameters --- these fields must be set before calling
303
* jpeg_start_compress(). We recommend calling jpeg_set_defaults() to
304
* initialize everything to reasonable defaults, then changing anything
305
* the application specifically wants to change. That way you won't get
306
* burnt when new parameters are added. Also note that there are several
307
* helper routines to simplify changing parameters.
310
unsigned int scale_num, scale_denom; /* fraction by which to scale image */
312
JDIMENSION jpeg_width; /* scaled JPEG image width */
313
JDIMENSION jpeg_height; /* scaled JPEG image height */
314
/* Dimensions of actual JPEG image that will be written to file,
315
* derived from input dimensions by scaling factors above.
316
* These fields are computed by jpeg_start_compress().
317
* You can also use jpeg_calc_jpeg_dimensions() to determine these values
318
* in advance of calling jpeg_start_compress().
321
int data_precision; /* bits of precision in image data */
323
int num_components; /* # of color components in JPEG image */
324
J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
326
jpeg_component_info * comp_info;
327
/* comp_info[i] describes component that appears i'th in SOF */
329
JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
330
int q_scale_factor[NUM_QUANT_TBLS];
331
/* ptrs to coefficient quantization tables, or NULL if not defined,
332
* and corresponding scale factors (percentage, initialized 100).
335
JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
336
JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
337
/* ptrs to Huffman coding tables, or NULL if not defined */
339
UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
340
UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
341
UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
343
int num_scans; /* # of entries in scan_info array */
344
const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */
345
/* The default value of scan_info is NULL, which causes a single-scan
346
* sequential JPEG file to be emitted. To create a multi-scan file,
347
* set num_scans and scan_info to point to an array of scan definitions.
350
boolean raw_data_in; /* TRUE=caller supplies downsampled data */
351
boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
352
boolean optimize_coding; /* TRUE=optimize entropy encoding parms */
353
boolean CCIR601_sampling; /* TRUE=first samples are cosited */
354
boolean do_fancy_downsampling; /* TRUE=apply fancy downsampling */
355
int smoothing_factor; /* 1..100, or 0 for no input smoothing */
356
J_DCT_METHOD dct_method; /* DCT algorithm selector */
358
/* The restart interval can be specified in absolute MCUs by setting
359
* restart_interval, or in MCU rows by setting restart_in_rows
360
* (in which case the correct restart_interval will be figured
363
unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
364
int restart_in_rows; /* if > 0, MCU rows per restart interval */
366
/* Parameters controlling emission of special markers. */
368
boolean write_JFIF_header; /* should a JFIF marker be written? */
369
UINT8 JFIF_major_version; /* What to write for the JFIF version number */
370
UINT8 JFIF_minor_version;
371
/* These three values are not used by the JPEG code, merely copied */
372
/* into the JFIF APP0 marker. density_unit can be 0 for unknown, */
373
/* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */
374
/* ratio is defined by X_density/Y_density even when density_unit=0. */
375
UINT8 density_unit; /* JFIF code for pixel size units */
376
UINT16 X_density; /* Horizontal pixel density */
377
UINT16 Y_density; /* Vertical pixel density */
378
boolean write_Adobe_marker; /* should an Adobe marker be written? */
380
J_COLOR_TRANSFORM color_transform;
381
/* Color transform identifier, writes LSE marker if nonzero */
383
/* State variable: index of next scanline to be written to
384
* jpeg_write_scanlines(). Application may use this to control its
385
* processing loop, e.g., "while (next_scanline < image_height)".
388
JDIMENSION next_scanline; /* 0 .. image_height-1 */
390
/* Remaining fields are known throughout compressor, but generally
391
* should not be touched by a surrounding application.
395
* These fields are computed during compression startup
397
boolean progressive_mode; /* TRUE if scan script uses progressive mode */
398
int max_h_samp_factor; /* largest h_samp_factor */
399
int max_v_samp_factor; /* largest v_samp_factor */
401
int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
402
int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
404
JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */
405
/* The coefficient controller receives data in units of MCU rows as defined
406
* for fully interleaved scans (whether the JPEG file is interleaved or not).
407
* There are v_samp_factor * DCTSIZE sample rows of each component in an
408
* "iMCU" (interleaved MCU) row.
412
* These fields are valid during any one scan.
413
* They describe the components and MCUs actually appearing in the scan.
415
int comps_in_scan; /* # of JPEG components in this scan */
416
jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
417
/* *cur_comp_info[i] describes component that appears i'th in SOS */
419
JDIMENSION MCUs_per_row; /* # of MCUs across the image */
420
JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
422
int blocks_in_MCU; /* # of DCT blocks per MCU */
423
int MCU_membership[C_MAX_BLOCKS_IN_MCU];
424
/* MCU_membership[i] is index in cur_comp_info of component owning */
425
/* i'th block in an MCU */
427
int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
429
int block_size; /* the basic DCT block size: 1..16 */
430
const int * natural_order; /* natural-order position array */
431
int lim_Se; /* min( Se, DCTSIZE2-1 ) */
434
* Links to compression subobjects (methods and private variables of modules)
436
struct jpeg_comp_master * master;
437
struct jpeg_c_main_controller * main;
438
struct jpeg_c_prep_controller * prep;
439
struct jpeg_c_coef_controller * coef;
440
struct jpeg_marker_writer * marker;
441
struct jpeg_color_converter * cconvert;
442
struct jpeg_downsampler * downsample;
443
struct jpeg_forward_dct * fdct;
444
struct jpeg_entropy_encoder * entropy;
445
jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */
446
int script_space_size;
450
/* Master record for a decompression instance */
452
struct jpeg_decompress_struct {
453
jpeg_common_fields; /* Fields shared with jpeg_compress_struct */
455
/* Source of compressed data */
456
struct jpeg_source_mgr * src;
458
/* Basic description of image --- filled in by jpeg_read_header(). */
459
/* Application may inspect these values to decide how to process image. */
461
JDIMENSION image_width; /* nominal image width (from SOF marker) */
462
JDIMENSION image_height; /* nominal image height */
463
int num_components; /* # of color components in JPEG image */
464
J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
466
/* Decompression processing parameters --- these fields must be set before
467
* calling jpeg_start_decompress(). Note that jpeg_read_header() initializes
468
* them to default values.
471
J_COLOR_SPACE out_color_space; /* colorspace for output */
473
unsigned int scale_num, scale_denom; /* fraction by which to scale image */
475
double output_gamma; /* image gamma wanted in output */
477
boolean buffered_image; /* TRUE=multiple output passes */
478
boolean raw_data_out; /* TRUE=downsampled data wanted */
480
J_DCT_METHOD dct_method; /* IDCT algorithm selector */
481
boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */
482
boolean do_block_smoothing; /* TRUE=apply interblock smoothing */
484
boolean quantize_colors; /* TRUE=colormapped output wanted */
485
/* the following are ignored if not quantize_colors: */
486
J_DITHER_MODE dither_mode; /* type of color dithering to use */
487
boolean two_pass_quantize; /* TRUE=use two-pass color quantization */
488
int desired_number_of_colors; /* max # colors to use in created colormap */
489
/* these are significant only in buffered-image mode: */
490
boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */
491
boolean enable_external_quant;/* enable future use of external colormap */
492
boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */
494
/* Description of actual output image that will be returned to application.
495
* These fields are computed by jpeg_start_decompress().
496
* You can also use jpeg_calc_output_dimensions() to determine these values
497
* in advance of calling jpeg_start_decompress().
500
JDIMENSION output_width; /* scaled image width */
501
JDIMENSION output_height; /* scaled image height */
502
int out_color_components; /* # of color components in out_color_space */
503
int output_components; /* # of color components returned */
504
/* output_components is 1 (a colormap index) when quantizing colors;
505
* otherwise it equals out_color_components.
507
int rec_outbuf_height; /* min recommended height of scanline buffer */
508
/* If the buffer passed to jpeg_read_scanlines() is less than this many rows
509
* high, space and time will be wasted due to unnecessary data copying.
510
* Usually rec_outbuf_height will be 1 or 2, at most 4.
513
/* When quantizing colors, the output colormap is described by these fields.
514
* The application can supply a colormap by setting colormap non-NULL before
515
* calling jpeg_start_decompress; otherwise a colormap is created during
516
* jpeg_start_decompress or jpeg_start_output.
517
* The map has out_color_components rows and actual_number_of_colors columns.
519
int actual_number_of_colors; /* number of entries in use */
520
JSAMPARRAY colormap; /* The color map as a 2-D pixel array */
522
/* State variables: these variables indicate the progress of decompression.
523
* The application may examine these but must not modify them.
526
/* Row index of next scanline to be read from jpeg_read_scanlines().
527
* Application may use this to control its processing loop, e.g.,
528
* "while (output_scanline < output_height)".
530
JDIMENSION output_scanline; /* 0 .. output_height-1 */
532
/* Current input scan number and number of iMCU rows completed in scan.
533
* These indicate the progress of the decompressor input side.
535
int input_scan_number; /* Number of SOS markers seen so far */
536
JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */
538
/* The "output scan number" is the notional scan being displayed by the
539
* output side. The decompressor will not allow output scan/row number
540
* to get ahead of input scan/row, but it can fall arbitrarily far behind.
542
int output_scan_number; /* Nominal scan number being displayed */
543
JDIMENSION output_iMCU_row; /* Number of iMCU rows read */
545
/* Current progression status. coef_bits[c][i] indicates the precision
546
* with which component c's DCT coefficient i (in zigzag order) is known.
547
* It is -1 when no data has yet been received, otherwise it is the point
548
* transform (shift) value for the most recent scan of the coefficient
549
* (thus, 0 at completion of the progression).
550
* This pointer is NULL when reading a non-progressive file.
552
int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */
554
/* Internal JPEG parameters --- the application usually need not look at
555
* these fields. Note that the decompressor output side may not use
556
* any parameters that can change between scans.
559
/* Quantization and Huffman tables are carried forward across input
560
* datastreams when processing abbreviated JPEG datastreams.
563
JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
564
/* ptrs to coefficient quantization tables, or NULL if not defined */
566
JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
567
JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
568
/* ptrs to Huffman coding tables, or NULL if not defined */
570
/* These parameters are never carried across datastreams, since they
571
* are given in SOF/SOS markers or defined to be reset by SOI.
574
int data_precision; /* bits of precision in image data */
576
jpeg_component_info * comp_info;
577
/* comp_info[i] describes component that appears i'th in SOF */
579
boolean is_baseline; /* TRUE if Baseline SOF0 encountered */
580
boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */
581
boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
583
UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
584
UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
585
UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
587
unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */
589
/* These fields record data obtained from optional markers recognized by
592
boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */
593
/* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
594
UINT8 JFIF_major_version; /* JFIF version number */
595
UINT8 JFIF_minor_version;
596
UINT8 density_unit; /* JFIF code for pixel size units */
597
UINT16 X_density; /* Horizontal pixel density */
598
UINT16 Y_density; /* Vertical pixel density */
599
boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */
600
UINT8 Adobe_transform; /* Color transform code from Adobe marker */
602
J_COLOR_TRANSFORM color_transform;
603
/* Color transform identifier derived from LSE marker, otherwise zero */
605
boolean CCIR601_sampling; /* TRUE=first samples are cosited */
607
/* Aside from the specific data retained from APPn markers known to the
608
* library, the uninterpreted contents of any or all APPn and COM markers
609
* can be saved in a list for examination by the application.
611
jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */
613
/* Remaining fields are known throughout decompressor, but generally
614
* should not be touched by a surrounding application.
618
* These fields are computed during decompression startup
620
int max_h_samp_factor; /* largest h_samp_factor */
621
int max_v_samp_factor; /* largest v_samp_factor */
623
int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
624
int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
626
JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */
627
/* The coefficient controller's input and output progress is measured in
628
* units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows
629
* in fully interleaved JPEG scans, but are used whether the scan is
630
* interleaved or not. We define an iMCU row as v_samp_factor DCT block
631
* rows of each component. Therefore, the IDCT output contains
632
* v_samp_factor*DCT_v_scaled_size sample rows of a component per iMCU row.
635
JSAMPLE * sample_range_limit; /* table for fast range-limiting */
638
* These fields are valid during any one scan.
639
* They describe the components and MCUs actually appearing in the scan.
640
* Note that the decompressor output side must not use these fields.
642
int comps_in_scan; /* # of JPEG components in this scan */
643
jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
644
/* *cur_comp_info[i] describes component that appears i'th in SOS */
646
JDIMENSION MCUs_per_row; /* # of MCUs across the image */
647
JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
649
int blocks_in_MCU; /* # of DCT blocks per MCU */
650
int MCU_membership[D_MAX_BLOCKS_IN_MCU];
651
/* MCU_membership[i] is index in cur_comp_info of component owning */
652
/* i'th block in an MCU */
654
int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
656
/* These fields are derived from Se of first SOS marker.
658
int block_size; /* the basic DCT block size: 1..16 */
659
const int * natural_order; /* natural-order position array for entropy decode */
660
int lim_Se; /* min( Se, DCTSIZE2-1 ) for entropy decode */
662
/* This field is shared between entropy decoder and marker parser.
663
* It is either zero or the code of a JPEG marker that has been
664
* read from the data source, but has not yet been processed.
669
* Links to decompression subobjects (methods, private variables of modules)
671
struct jpeg_decomp_master * master;
672
struct jpeg_d_main_controller * main;
673
struct jpeg_d_coef_controller * coef;
674
struct jpeg_d_post_controller * post;
675
struct jpeg_input_controller * inputctl;
676
struct jpeg_marker_reader * marker;
677
struct jpeg_entropy_decoder * entropy;
678
struct jpeg_inverse_dct * idct;
679
struct jpeg_upsampler * upsample;
680
struct jpeg_color_deconverter * cconvert;
681
struct jpeg_color_quantizer * cquantize;
685
/* "Object" declarations for JPEG modules that may be supplied or called
686
* directly by the surrounding application.
687
* As with all objects in the JPEG library, these structs only define the
688
* publicly visible methods and state variables of a module. Additional
689
* private fields may exist after the public ones.
693
/* Error handler object */
695
struct jpeg_error_mgr {
696
/* Error exit handler: does not return to caller */
697
JMETHOD(noreturn_t, error_exit, (j_common_ptr cinfo));
698
/* Conditionally emit a trace or warning message */
699
JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
700
/* Routine that actually outputs a trace or error message */
701
JMETHOD(void, output_message, (j_common_ptr cinfo));
702
/* Format a message string for the most recent JPEG error or message */
703
JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer));
704
#define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */
705
/* Reset error state variables at start of a new image */
706
JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));
708
/* The message ID code and any parameters are saved here.
709
* A message can have one string parameter or up to 8 int parameters.
712
#define JMSG_STR_PARM_MAX 80
715
char s[JMSG_STR_PARM_MAX];
718
/* Standard state variables for error facility */
720
int trace_level; /* max msg_level that will be displayed */
722
/* For recoverable corrupt-data errors, we emit a warning message,
723
* but keep going unless emit_message chooses to abort. emit_message
724
* should count warnings in num_warnings. The surrounding application
725
* can check for bad data by seeing if num_warnings is nonzero at the
728
long num_warnings; /* number of corrupt-data warnings */
730
/* These fields point to the table(s) of error message strings.
731
* An application can change the table pointer to switch to a different
732
* message list (typically, to change the language in which errors are
733
* reported). Some applications may wish to add additional error codes
734
* that will be handled by the JPEG library error mechanism; the second
735
* table pointer is used for this purpose.
737
* First table includes all errors generated by JPEG library itself.
738
* Error code 0 is reserved for a "no such error string" message.
740
const char * const * jpeg_message_table; /* Library errors */
741
int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */
742
/* Second table can be added by application (see cjpeg/djpeg for example).
743
* It contains strings numbered first_addon_message..last_addon_message.
745
const char * const * addon_message_table; /* Non-library errors */
746
int first_addon_message; /* code for first string in addon table */
747
int last_addon_message; /* code for last string in addon table */
751
/* Progress monitor object */
753
struct jpeg_progress_mgr {
754
JMETHOD(void, progress_monitor, (j_common_ptr cinfo));
756
long pass_counter; /* work units completed in this pass */
757
long pass_limit; /* total number of work units in this pass */
758
int completed_passes; /* passes completed so far */
759
int total_passes; /* total number of passes expected */
763
/* Data destination object for compression */
765
struct jpeg_destination_mgr {
766
JOCTET * next_output_byte; /* => next byte to write in buffer */
767
size_t free_in_buffer; /* # of byte spaces remaining in buffer */
769
JMETHOD(void, init_destination, (j_compress_ptr cinfo));
770
JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo));
771
JMETHOD(void, term_destination, (j_compress_ptr cinfo));
775
/* Data source object for decompression */
777
struct jpeg_source_mgr {
778
const JOCTET * next_input_byte; /* => next byte to read from buffer */
779
size_t bytes_in_buffer; /* # of bytes remaining in buffer */
781
JMETHOD(void, init_source, (j_decompress_ptr cinfo));
782
JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo));
783
JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes));
784
JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired));
785
JMETHOD(void, term_source, (j_decompress_ptr cinfo));
789
/* Memory manager object.
790
* Allocates "small" objects (a few K total), "large" objects (tens of K),
791
* and "really big" objects (virtual arrays with backing store if needed).
792
* The memory manager does not allow individual objects to be freed; rather,
793
* each created object is assigned to a pool, and whole pools can be freed
794
* at once. This is faster and more convenient than remembering exactly what
795
* to free, especially where malloc()/free() are not too speedy.
796
* NB: alloc routines never return NULL. They exit to error_exit if not
800
#define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */
801
#define JPOOL_IMAGE 1 /* lasts until done with image/datastream */
802
#define JPOOL_NUMPOOLS 2
804
typedef struct jvirt_sarray_control * jvirt_sarray_ptr;
805
typedef struct jvirt_barray_control * jvirt_barray_ptr;
808
struct jpeg_memory_mgr {
809
/* Method pointers */
810
JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id,
811
size_t sizeofobject));
812
JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id,
813
size_t sizeofobject));
814
JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id,
815
JDIMENSION samplesperrow,
816
JDIMENSION numrows));
817
JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id,
818
JDIMENSION blocksperrow,
819
JDIMENSION numrows));
820
JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo,
823
JDIMENSION samplesperrow,
825
JDIMENSION maxaccess));
826
JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo,
829
JDIMENSION blocksperrow,
831
JDIMENSION maxaccess));
832
JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo));
833
JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo,
834
jvirt_sarray_ptr ptr,
835
JDIMENSION start_row,
838
JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo,
839
jvirt_barray_ptr ptr,
840
JDIMENSION start_row,
843
JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id));
844
JMETHOD(void, self_destruct, (j_common_ptr cinfo));
846
/* Limit on memory allocation for this JPEG object. (Note that this is
847
* merely advisory, not a guaranteed maximum; it only affects the space
848
* used for virtual-array buffers.) May be changed by outer application
849
* after creating the JPEG object.
851
long max_memory_to_use;
853
/* Maximum allocation request accepted by alloc_large. */
854
long max_alloc_chunk;
858
/* Routine signature for application-supplied marker processing methods.
859
* Need not pass marker code since it is stored in cinfo->unread_marker.
861
typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
864
/* Declarations for routines called by application.
865
* The JPP macro hides prototype parameters from compilers that can't cope.
866
* Note JPP requires double parentheses.
869
#ifdef HAVE_PROTOTYPES
870
#define JPP(arglist) arglist
872
#define JPP(arglist) ()
876
/* Short forms of external names for systems with brain-damaged linkers.
877
* We shorten external names to be unique in the first six letters, which
878
* is good enough for all known systems.
879
* (If your compiler itself needs names to be unique in less than 15
880
* characters, you are out of luck. Get a better compiler.)
883
#ifdef NEED_SHORT_EXTERNAL_NAMES
884
#define jpeg_std_error jStdError
885
#define jpeg_CreateCompress jCreaCompress
886
#define jpeg_CreateDecompress jCreaDecompress
887
#define jpeg_destroy_compress jDestCompress
888
#define jpeg_destroy_decompress jDestDecompress
889
#define jpeg_stdio_dest jStdDest
890
#define jpeg_stdio_src jStdSrc
891
#define jpeg_mem_dest jMemDest
892
#define jpeg_mem_src jMemSrc
893
#define jpeg_set_defaults jSetDefaults
894
#define jpeg_set_colorspace jSetColorspace
895
#define jpeg_default_colorspace jDefColorspace
896
#define jpeg_set_quality jSetQuality
897
#define jpeg_set_linear_quality jSetLQuality
898
#define jpeg_default_qtables jDefQTables
899
#define jpeg_add_quant_table jAddQuantTable
900
#define jpeg_quality_scaling jQualityScaling
901
#define jpeg_simple_progression jSimProgress
902
#define jpeg_suppress_tables jSuppressTables
903
#define jpeg_alloc_quant_table jAlcQTable
904
#define jpeg_alloc_huff_table jAlcHTable
905
#define jpeg_start_compress jStrtCompress
906
#define jpeg_write_scanlines jWrtScanlines
907
#define jpeg_finish_compress jFinCompress
908
#define jpeg_calc_jpeg_dimensions jCjpegDimensions
909
#define jpeg_write_raw_data jWrtRawData
910
#define jpeg_write_marker jWrtMarker
911
#define jpeg_write_m_header jWrtMHeader
912
#define jpeg_write_m_byte jWrtMByte
913
#define jpeg_write_tables jWrtTables
914
#define jpeg_read_header jReadHeader
915
#define jpeg_start_decompress jStrtDecompress
916
#define jpeg_read_scanlines jReadScanlines
917
#define jpeg_finish_decompress jFinDecompress
918
#define jpeg_read_raw_data jReadRawData
919
#define jpeg_has_multiple_scans jHasMultScn
920
#define jpeg_start_output jStrtOutput
921
#define jpeg_finish_output jFinOutput
922
#define jpeg_input_complete jInComplete
923
#define jpeg_new_colormap jNewCMap
924
#define jpeg_consume_input jConsumeInput
925
#define jpeg_core_output_dimensions jCoreDimensions
926
#define jpeg_calc_output_dimensions jCalcDimensions
927
#define jpeg_save_markers jSaveMarkers
928
#define jpeg_set_marker_processor jSetMarker
929
#define jpeg_read_coefficients jReadCoefs
930
#define jpeg_write_coefficients jWrtCoefs
931
#define jpeg_copy_critical_parameters jCopyCrit
932
#define jpeg_abort_compress jAbrtCompress
933
#define jpeg_abort_decompress jAbrtDecompress
934
#define jpeg_abort jAbort
935
#define jpeg_destroy jDestroy
936
#define jpeg_resync_to_restart jResyncRestart
937
#endif /* NEED_SHORT_EXTERNAL_NAMES */
940
/* Default error-management setup */
941
EXTERN(struct jpeg_error_mgr *) jpeg_std_error
942
JPP((struct jpeg_error_mgr * err));
944
/* Initialization of JPEG compression objects.
945
* jpeg_create_compress() and jpeg_create_decompress() are the exported
946
* names that applications should call. These expand to calls on
947
* jpeg_CreateCompress and jpeg_CreateDecompress with additional information
948
* passed for version mismatch checking.
949
* NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
951
#define jpeg_create_compress(cinfo) \
952
jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
953
(size_t) sizeof(struct jpeg_compress_struct))
954
#define jpeg_create_decompress(cinfo) \
955
jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
956
(size_t) sizeof(struct jpeg_decompress_struct))
957
EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo,
958
int version, size_t structsize));
959
EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo,
960
int version, size_t structsize));
961
/* Destruction of JPEG compression objects */
962
EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo));
963
EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));
965
/* Standard data source and destination managers: stdio streams. */
966
/* Caller is responsible for opening the file before and closing after. */
967
EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
968
EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile));
970
/* Data source and destination managers: memory buffers. */
971
EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo,
972
unsigned char ** outbuffer,
973
unsigned long * outsize));
974
EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo,
975
unsigned char * inbuffer,
976
unsigned long insize));
978
/* Default parameter setup for compression */
979
EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo));
980
/* Compression parameter setup aids */
981
EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo,
982
J_COLOR_SPACE colorspace));
983
EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo));
984
EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality,
985
boolean force_baseline));
986
EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo,
988
boolean force_baseline));
989
EXTERN(void) jpeg_default_qtables JPP((j_compress_ptr cinfo,
990
boolean force_baseline));
991
EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl,
992
const unsigned int *basic_table,
994
boolean force_baseline));
995
EXTERN(int) jpeg_quality_scaling JPP((int quality));
996
EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo));
997
EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo,
999
EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo));
1000
EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo));
1002
/* Main entry points for compression */
1003
EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo,
1004
boolean write_all_tables));
1005
EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo,
1006
JSAMPARRAY scanlines,
1007
JDIMENSION num_lines));
1008
EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo));
1010
/* Precalculate JPEG dimensions for current compression parameters. */
1011
EXTERN(void) jpeg_calc_jpeg_dimensions JPP((j_compress_ptr cinfo));
1013
/* Replaces jpeg_write_scanlines when writing raw downsampled data. */
1014
EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo,
1016
JDIMENSION num_lines));
1018
/* Write a special marker. See libjpeg.txt concerning safe usage. */
1019
EXTERN(void) jpeg_write_marker
1020
JPP((j_compress_ptr cinfo, int marker,
1021
const JOCTET * dataptr, unsigned int datalen));
1022
/* Same, but piecemeal. */
1023
EXTERN(void) jpeg_write_m_header
1024
JPP((j_compress_ptr cinfo, int marker, unsigned int datalen));
1025
EXTERN(void) jpeg_write_m_byte
1026
JPP((j_compress_ptr cinfo, int val));
1028
/* Alternate compression function: just write an abbreviated table file */
1029
EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo));
1031
/* Decompression startup: read start of JPEG datastream to see what's there */
1032
EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo,
1033
boolean require_image));
1034
/* Return value is one of: */
1035
#define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */
1036
#define JPEG_HEADER_OK 1 /* Found valid image datastream */
1037
#define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */
1038
/* If you pass require_image = TRUE (normal case), you need not check for
1039
* a TABLES_ONLY return code; an abbreviated file will cause an error exit.
1040
* JPEG_SUSPENDED is only possible if you use a data source module that can
1041
* give a suspension return (the stdio source module doesn't).
1044
/* Main entry points for decompression */
1045
EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo));
1046
EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo,
1047
JSAMPARRAY scanlines,
1048
JDIMENSION max_lines));
1049
EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo));
1051
/* Replaces jpeg_read_scanlines when reading raw downsampled data. */
1052
EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo,
1054
JDIMENSION max_lines));
1056
/* Additional entry points for buffered-image mode. */
1057
EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo));
1058
EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo,
1060
EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo));
1061
EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo));
1062
EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo));
1063
EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo));
1064
/* Return value is one of: */
1065
/* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */
1066
#define JPEG_REACHED_SOS 1 /* Reached start of new scan */
1067
#define JPEG_REACHED_EOI 2 /* Reached end of image */
1068
#define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */
1069
#define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */
1071
/* Precalculate output dimensions for current decompression parameters. */
1072
EXTERN(void) jpeg_core_output_dimensions JPP((j_decompress_ptr cinfo));
1073
EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
1075
/* Control saving of COM and APPn markers into marker_list. */
1076
EXTERN(void) jpeg_save_markers
1077
JPP((j_decompress_ptr cinfo, int marker_code,
1078
unsigned int length_limit));
1080
/* Install a special processing method for COM or APPn markers. */
1081
EXTERN(void) jpeg_set_marker_processor
1082
JPP((j_decompress_ptr cinfo, int marker_code,
1083
jpeg_marker_parser_method routine));
1085
/* Read or write raw DCT coefficients --- useful for lossless transcoding. */
1086
EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
1087
EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo,
1088
jvirt_barray_ptr * coef_arrays));
1089
EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo,
1090
j_compress_ptr dstinfo));
1092
/* If you choose to abort compression or decompression before completing
1093
* jpeg_finish_(de)compress, then you need to clean up to release memory,
1094
* temporary files, etc. You can just call jpeg_destroy_(de)compress
1095
* if you're done with the JPEG object, but if you want to clean it up and
1096
* reuse it, call this:
1098
EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo));
1099
EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo));
1101
/* Generic versions of jpeg_abort and jpeg_destroy that work on either
1102
* flavor of JPEG object. These may be more convenient in some places.
1104
EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo));
1105
EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo));
1107
/* Default restart-marker-resync procedure for use by data source modules */
1108
EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo,
1112
/* These marker codes are exported since applications and data source modules
1113
* are likely to want to use them.
1116
#define JPEG_RST0 0xD0 /* RST0 marker code */
1117
#define JPEG_EOI 0xD9 /* EOI marker code */
1118
#define JPEG_APP0 0xE0 /* APP0 marker code */
1119
#define JPEG_COM 0xFE /* COM marker code */
1122
/* If we have a brain-damaged compiler that emits warnings (or worse, errors)
1123
* for structure definitions that are never filled in, keep it quiet by
1124
* supplying dummy definitions for the various substructures.
1127
#ifdef INCOMPLETE_TYPES_BROKEN
1128
#ifndef JPEG_INTERNALS /* will be defined in jpegint.h */
1129
struct jvirt_sarray_control { long dummy; };
1130
struct jvirt_barray_control { long dummy; };
1131
struct jpeg_comp_master { long dummy; };
1132
struct jpeg_c_main_controller { long dummy; };
1133
struct jpeg_c_prep_controller { long dummy; };
1134
struct jpeg_c_coef_controller { long dummy; };
1135
struct jpeg_marker_writer { long dummy; };
1136
struct jpeg_color_converter { long dummy; };
1137
struct jpeg_downsampler { long dummy; };
1138
struct jpeg_forward_dct { long dummy; };
1139
struct jpeg_entropy_encoder { long dummy; };
1140
struct jpeg_decomp_master { long dummy; };
1141
struct jpeg_d_main_controller { long dummy; };
1142
struct jpeg_d_coef_controller { long dummy; };
1143
struct jpeg_d_post_controller { long dummy; };
1144
struct jpeg_input_controller { long dummy; };
1145
struct jpeg_marker_reader { long dummy; };
1146
struct jpeg_entropy_decoder { long dummy; };
1147
struct jpeg_inverse_dct { long dummy; };
1148
struct jpeg_upsampler { long dummy; };
1149
struct jpeg_color_deconverter { long dummy; };
1150
struct jpeg_color_quantizer { long dummy; };
1151
#endif /* JPEG_INTERNALS */
1152
#endif /* INCOMPLETE_TYPES_BROKEN */
1156
* The JPEG library modules define JPEG_INTERNALS before including this file.
1157
* The internal structure declarations are read only when that is true.
1158
* Applications using the library should not include jpegint.h, but may wish
1159
* to include jerror.h.
1162
#ifdef JPEG_INTERNALS
1163
#include "jpegint.h" /* fetch private declarations */
1164
#include "jerror.h" /* fetch error codes too */
1168
#ifndef DONT_USE_EXTERN_C
1173
#endif /* JPEGLIB_H */