source: trunk/libjpeg/jpeglib.h @ 15

Last change on this file since 15 was 15, checked in by Eugene Romanenko, 16 years ago

needed libs update

File size: 46.3 KB
Line 
1/*
2 * jpeglib.h
3 *
4 * Copyright (C) 1991-1998, Thomas G. Lane.
5 * This file is part of the Independent JPEG Group's software.
6 * For conditions of distribution and use, see the accompanying README file.
7 *
8 * This file defines the application interface for the JPEG library.
9 * Most applications using the library need only include this file,
10 * and perhaps jerror.h if they want to know the exact error codes.
11 */
12
13#ifndef JPEGLIB_H
14#define JPEGLIB_H
15
16/*
17 * First we include the configuration files that record how this
18 * installation of the JPEG library is set up.  jconfig.h can be
19 * generated automatically for many systems.  jmorecfg.h contains
20 * manual configuration options that most people need not worry about.
21 */
22
23#ifndef JCONFIG_INCLUDED        /* in case jinclude.h already did */
24#include "jconfig.h"            /* widely used configuration options */
25#endif
26#include "jmorecfg.h"           /* seldom changed options */
27
28
29/* Version ID for the JPEG library.
30 * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60".
31 */
32
33#define JPEG_LIB_VERSION  62    /* Version 6b */
34
35
36/* Various constants determining the sizes of things.
37 * All of these are specified by the JPEG standard, so don't change them
38 * if you want to be compatible.
39 */
40
41#define DCTSIZE             8   /* The basic DCT block is 8x8 samples */
42#define DCTSIZE2            64  /* DCTSIZE squared; # of elements in a block */
43#define NUM_QUANT_TBLS      4   /* Quantization tables are numbered 0..3 */
44#define NUM_HUFF_TBLS       4   /* Huffman tables are numbered 0..3 */
45#define NUM_ARITH_TBLS      16  /* Arith-coding tables are numbered 0..15 */
46#define MAX_COMPS_IN_SCAN   4   /* JPEG limit on # of components in one scan */
47#define MAX_SAMP_FACTOR     4   /* JPEG limit on sampling factors */
48/* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
49 * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
50 * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
51 * to handle it.  We even let you do this from the jconfig.h file.  However,
52 * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
53 * sometimes emits noncompliant files doesn't mean you should too.
54 */
55#define C_MAX_BLOCKS_IN_MCU   10 /* compressor's limit on blocks per MCU */
56#ifndef D_MAX_BLOCKS_IN_MCU
57#define D_MAX_BLOCKS_IN_MCU   10 /* decompressor's limit on blocks per MCU */
58#endif
59
60
61/* Data structures for images (arrays of samples and of DCT coefficients).
62 * On 80x86 machines, the image arrays are too big for near pointers,
63 * but the pointer arrays can fit in near memory.
64 */
65
66typedef JSAMPLE FAR *JSAMPROW;  /* ptr to one image row of pixel samples. */
67typedef JSAMPROW *JSAMPARRAY;   /* ptr to some rows (a 2-D sample array) */
68typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */
69
70typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */
71typedef JBLOCK FAR *JBLOCKROW;  /* pointer to one row of coefficient blocks */
72typedef JBLOCKROW *JBLOCKARRAY;         /* a 2-D array of coefficient blocks */
73typedef JBLOCKARRAY *JBLOCKIMAGE;       /* a 3-D array of coefficient blocks */
74
75typedef JCOEF FAR *JCOEFPTR;    /* useful in a couple of places */
76
77
78/* Types for JPEG compression parameters and working tables. */
79
80
81/* DCT coefficient quantization tables. */
82
83typedef struct {
84  /* This array gives the coefficient quantizers in natural array order
85   * (not the zigzag order in which they are stored in a JPEG DQT marker).
86   * CAUTION: IJG versions prior to v6a kept this array in zigzag order.
87   */
88  UINT16 quantval[DCTSIZE2];    /* quantization step for each coefficient */
89  /* This field is used only during compression.  It's initialized FALSE when
90   * the table is created, and set TRUE when it's been output to the file.
91   * You could suppress output of a table by setting this to TRUE.
92   * (See jpeg_suppress_tables for an example.)
93   */
94  boolean sent_table;           /* TRUE when table has been output */
95} JQUANT_TBL;
96
97
98/* Huffman coding tables. */
99
100typedef struct {
101  /* These two fields directly represent the contents of a JPEG DHT marker */
102  UINT8 bits[17];               /* bits[k] = # of symbols with codes of */
103                                /* length k bits; bits[0] is unused */
104  UINT8 huffval[256];           /* The symbols, in order of incr code length */
105  /* This field is used only during compression.  It's initialized FALSE when
106   * the table is created, and set TRUE when it's been output to the file.
107   * You could suppress output of a table by setting this to TRUE.
108   * (See jpeg_suppress_tables for an example.)
109   */
110  boolean sent_table;           /* TRUE when table has been output */
111} JHUFF_TBL;
112
113
114/* Basic info about one component (color channel). */
115
116typedef struct {
117  /* These values are fixed over the whole image. */
118  /* For compression, they must be supplied by parameter setup; */
119  /* for decompression, they are read from the SOF marker. */
120  int component_id;             /* identifier for this component (0..255) */
121  int component_index;          /* its index in SOF or cinfo->comp_info[] */
122  int h_samp_factor;            /* horizontal sampling factor (1..4) */
123  int v_samp_factor;            /* vertical sampling factor (1..4) */
124  int quant_tbl_no;             /* quantization table selector (0..3) */
125  /* These values may vary between scans. */
126  /* For compression, they must be supplied by parameter setup; */
127  /* for decompression, they are read from the SOS marker. */
128  /* The decompressor output side may not use these variables. */
129  int dc_tbl_no;                /* DC entropy table selector (0..3) */
130  int ac_tbl_no;                /* AC entropy table selector (0..3) */
131 
132  /* Remaining fields should be treated as private by applications. */
133 
134  /* These values are computed during compression or decompression startup: */
135  /* Component's size in DCT blocks.
136   * Any dummy blocks added to complete an MCU are not counted; therefore
137   * these values do not depend on whether a scan is interleaved or not.
138   */
139  JDIMENSION width_in_blocks;
140  JDIMENSION height_in_blocks;
141  /* Size of a DCT block in samples.  Always DCTSIZE for compression.
142   * For decompression this is the size of the output from one DCT block,
143   * reflecting any scaling we choose to apply during the IDCT step.
144   * Values of 1,2,4,8 are likely to be supported.  Note that different
145   * components may receive different IDCT scalings.
146   */
147  int DCT_scaled_size;
148  /* The downsampled dimensions are the component's actual, unpadded number
149   * of samples at the main buffer (preprocessing/compression interface), thus
150   * downsampled_width = ceil(image_width * Hi/Hmax)
151   * and similarly for height.  For decompression, IDCT scaling is included, so
152   * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE)
153   */
154  JDIMENSION downsampled_width;  /* actual width in samples */
155  JDIMENSION downsampled_height; /* actual height in samples */
156  /* This flag is used only for decompression.  In cases where some of the
157   * components will be ignored (eg grayscale output from YCbCr image),
158   * we can skip most computations for the unused components.
159   */
160  boolean component_needed;     /* do we need the value of this component? */
161
162  /* These values are computed before starting a scan of the component. */
163  /* The decompressor output side may not use these variables. */
164  int MCU_width;                /* number of blocks per MCU, horizontally */
165  int MCU_height;               /* number of blocks per MCU, vertically */
166  int MCU_blocks;               /* MCU_width * MCU_height */
167  int MCU_sample_width;         /* MCU width in samples, MCU_width*DCT_scaled_size */
168  int last_col_width;           /* # of non-dummy blocks across in last MCU */
169  int last_row_height;          /* # of non-dummy blocks down in last MCU */
170
171  /* Saved quantization table for component; NULL if none yet saved.
172   * See jdinput.c comments about the need for this information.
173   * This field is currently used only for decompression.
174   */
175  JQUANT_TBL * quant_table;
176
177  /* Private per-component storage for DCT or IDCT subsystem. */
178  void * dct_table;
179} jpeg_component_info;
180
181
182/* The script for encoding a multiple-scan file is an array of these: */
183
184typedef struct {
185  int comps_in_scan;            /* number of components encoded in this scan */
186  int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */
187  int Ss, Se;                   /* progressive JPEG spectral selection parms */
188  int Ah, Al;                   /* progressive JPEG successive approx. parms */
189} jpeg_scan_info;
190
191/* The decompressor can save APPn and COM markers in a list of these: */
192
193typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr;
194
195struct jpeg_marker_struct {
196  jpeg_saved_marker_ptr next;   /* next in list, or NULL */
197  UINT8 marker;                 /* marker code: JPEG_COM, or JPEG_APP0+n */
198  unsigned int original_length; /* # bytes of data in the file */
199  unsigned int data_length;     /* # bytes of data saved at data[] */
200  JOCTET FAR * data;            /* the data contained in the marker */
201  /* the marker length word is not counted in data_length or original_length */
202};
203
204/* Known color spaces. */
205
206typedef enum {
207        JCS_UNKNOWN,            /* error/unspecified */
208        JCS_GRAYSCALE,          /* monochrome */
209        JCS_RGB,                /* red/green/blue */
210        JCS_YCbCr,              /* Y/Cb/Cr (also known as YUV) */
211        JCS_CMYK,               /* C/M/Y/K */
212        JCS_YCCK                /* Y/Cb/Cr/K */
213} J_COLOR_SPACE;
214
215/* DCT/IDCT algorithm options. */
216
217typedef enum {
218        JDCT_ISLOW,             /* slow but accurate integer algorithm */
219        JDCT_IFAST,             /* faster, less accurate integer method */
220        JDCT_FLOAT              /* floating-point: accurate, fast on fast HW */
221} J_DCT_METHOD;
222
223#ifndef JDCT_DEFAULT            /* may be overridden in jconfig.h */
224#define JDCT_DEFAULT  JDCT_ISLOW
225#endif
226#ifndef JDCT_FASTEST            /* may be overridden in jconfig.h */
227#define JDCT_FASTEST  JDCT_IFAST
228#endif
229
230/* Dithering options for decompression. */
231
232typedef enum {
233        JDITHER_NONE,           /* no dithering */
234        JDITHER_ORDERED,        /* simple ordered dither */
235        JDITHER_FS              /* Floyd-Steinberg error diffusion dither */
236} J_DITHER_MODE;
237
238
239/* Common fields between JPEG compression and decompression master structs. */
240
241#define jpeg_common_fields \
242  struct jpeg_error_mgr * err;  /* Error handler module */\
243  struct jpeg_memory_mgr * mem; /* Memory manager module */\
244  struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\
245  void * client_data;           /* Available for use by application */\
246  boolean is_decompressor;      /* So common code can tell which is which */\
247  int global_state              /* For checking call sequence validity */
248
249/* Routines that are to be used by both halves of the library are declared
250 * to receive a pointer to this structure.  There are no actual instances of
251 * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
252 */
253struct jpeg_common_struct {
254  jpeg_common_fields;           /* Fields common to both master struct types */
255  /* Additional fields follow in an actual jpeg_compress_struct or
256   * jpeg_decompress_struct.  All three structs must agree on these
257   * initial fields!  (This would be a lot cleaner in C++.)
258   */
259};
260
261typedef struct jpeg_common_struct * j_common_ptr;
262typedef struct jpeg_compress_struct * j_compress_ptr;
263typedef struct jpeg_decompress_struct * j_decompress_ptr;
264
265
266/* Master record for a compression instance */
267
268struct jpeg_compress_struct {
269  jpeg_common_fields;           /* Fields shared with jpeg_decompress_struct */
270
271  /* Destination for compressed data */
272  struct jpeg_destination_mgr * dest;
273
274  /* Description of source image --- these fields must be filled in by
275   * outer application before starting compression.  in_color_space must
276   * be correct before you can even call jpeg_set_defaults().
277   */
278
279  JDIMENSION image_width;       /* input image width */
280  JDIMENSION image_height;      /* input image height */
281  int input_components;         /* # of color components in input image */
282  J_COLOR_SPACE in_color_space; /* colorspace of input image */
283
284  double input_gamma;           /* image gamma of input image */
285
286  /* Compression parameters --- these fields must be set before calling
287   * jpeg_start_compress().  We recommend calling jpeg_set_defaults() to
288   * initialize everything to reasonable defaults, then changing anything
289   * the application specifically wants to change.  That way you won't get
290   * burnt when new parameters are added.  Also note that there are several
291   * helper routines to simplify changing parameters.
292   */
293
294  int data_precision;           /* bits of precision in image data */
295
296  int num_components;           /* # of color components in JPEG image */
297  J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
298
299  jpeg_component_info * comp_info;
300  /* comp_info[i] describes component that appears i'th in SOF */
301 
302  JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
303  /* ptrs to coefficient quantization tables, or NULL if not defined */
304 
305  JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
306  JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
307  /* ptrs to Huffman coding tables, or NULL if not defined */
308 
309  UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
310  UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
311  UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
312
313  int num_scans;                /* # of entries in scan_info array */
314  const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */
315  /* The default value of scan_info is NULL, which causes a single-scan
316   * sequential JPEG file to be emitted.  To create a multi-scan file,
317   * set num_scans and scan_info to point to an array of scan definitions.
318   */
319
320  boolean raw_data_in;          /* TRUE=caller supplies downsampled data */
321  boolean arith_code;           /* TRUE=arithmetic coding, FALSE=Huffman */
322  boolean optimize_coding;      /* TRUE=optimize entropy encoding parms */
323  boolean CCIR601_sampling;     /* TRUE=first samples are cosited */
324  int smoothing_factor;         /* 1..100, or 0 for no input smoothing */
325  J_DCT_METHOD dct_method;      /* DCT algorithm selector */
326
327  /* The restart interval can be specified in absolute MCUs by setting
328   * restart_interval, or in MCU rows by setting restart_in_rows
329   * (in which case the correct restart_interval will be figured
330   * for each scan).
331   */
332  unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
333  int restart_in_rows;          /* if > 0, MCU rows per restart interval */
334
335  /* Parameters controlling emission of special markers. */
336
337  boolean write_JFIF_header;    /* should a JFIF marker be written? */
338  UINT8 JFIF_major_version;     /* What to write for the JFIF version number */
339  UINT8 JFIF_minor_version;
340  /* These three values are not used by the JPEG code, merely copied */
341  /* into the JFIF APP0 marker.  density_unit can be 0 for unknown, */
342  /* 1 for dots/inch, or 2 for dots/cm.  Note that the pixel aspect */
343  /* ratio is defined by X_density/Y_density even when density_unit=0. */
344  UINT8 density_unit;           /* JFIF code for pixel size units */
345  UINT16 X_density;             /* Horizontal pixel density */
346  UINT16 Y_density;             /* Vertical pixel density */
347  boolean write_Adobe_marker;   /* should an Adobe marker be written? */
348 
349  /* State variable: index of next scanline to be written to
350   * jpeg_write_scanlines().  Application may use this to control its
351   * processing loop, e.g., "while (next_scanline < image_height)".
352   */
353
354  JDIMENSION next_scanline;     /* 0 .. image_height-1  */
355
356  /* Remaining fields are known throughout compressor, but generally
357   * should not be touched by a surrounding application.
358   */
359
360  /*
361   * These fields are computed during compression startup
362   */
363  boolean progressive_mode;     /* TRUE if scan script uses progressive mode */
364  int max_h_samp_factor;        /* largest h_samp_factor */
365  int max_v_samp_factor;        /* largest v_samp_factor */
366
367  JDIMENSION total_iMCU_rows;   /* # of iMCU rows to be input to coef ctlr */
368  /* The coefficient controller receives data in units of MCU rows as defined
369   * for fully interleaved scans (whether the JPEG file is interleaved or not).
370   * There are v_samp_factor * DCTSIZE sample rows of each component in an
371   * "iMCU" (interleaved MCU) row.
372   */
373 
374  /*
375   * These fields are valid during any one scan.
376   * They describe the components and MCUs actually appearing in the scan.
377   */
378  int comps_in_scan;            /* # of JPEG components in this scan */
379  jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
380  /* *cur_comp_info[i] describes component that appears i'th in SOS */
381 
382  JDIMENSION MCUs_per_row;      /* # of MCUs across the image */
383  JDIMENSION MCU_rows_in_scan;  /* # of MCU rows in the image */
384 
385  int blocks_in_MCU;            /* # of DCT blocks per MCU */
386  int MCU_membership[C_MAX_BLOCKS_IN_MCU];
387  /* MCU_membership[i] is index in cur_comp_info of component owning */
388  /* i'th block in an MCU */
389
390  int Ss, Se, Ah, Al;           /* progressive JPEG parameters for scan */
391
392  /*
393   * Links to compression subobjects (methods and private variables of modules)
394   */
395  struct jpeg_comp_master * master;
396  struct jpeg_c_main_controller * main;
397  struct jpeg_c_prep_controller * prep;
398  struct jpeg_c_coef_controller * coef;
399  struct jpeg_marker_writer * marker;
400  struct jpeg_color_converter * cconvert;
401  struct jpeg_downsampler * downsample;
402  struct jpeg_forward_dct * fdct;
403  struct jpeg_entropy_encoder * entropy;
404  jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */
405  int script_space_size;
406};
407
408
409/* Master record for a decompression instance */
410
411struct jpeg_decompress_struct {
412  jpeg_common_fields;           /* Fields shared with jpeg_compress_struct */
413
414  /* Source of compressed data */
415  struct jpeg_source_mgr * src;
416
417  /* Basic description of image --- filled in by jpeg_read_header(). */
418  /* Application may inspect these values to decide how to process image. */
419
420  JDIMENSION image_width;       /* nominal image width (from SOF marker) */
421  JDIMENSION image_height;      /* nominal image height */
422  int num_components;           /* # of color components in JPEG image */
423  J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
424
425  /* Decompression processing parameters --- these fields must be set before
426   * calling jpeg_start_decompress().  Note that jpeg_read_header() initializes
427   * them to default values.
428   */
429
430  J_COLOR_SPACE out_color_space; /* colorspace for output */
431
432  unsigned int scale_num, scale_denom; /* fraction by which to scale image */
433
434  double output_gamma;          /* image gamma wanted in output */
435
436  boolean buffered_image;       /* TRUE=multiple output passes */
437  boolean raw_data_out;         /* TRUE=downsampled data wanted */
438
439  J_DCT_METHOD dct_method;      /* IDCT algorithm selector */
440  boolean do_fancy_upsampling;  /* TRUE=apply fancy upsampling */
441  boolean do_block_smoothing;   /* TRUE=apply interblock smoothing */
442
443  boolean quantize_colors;      /* TRUE=colormapped output wanted */
444  /* the following are ignored if not quantize_colors: */
445  J_DITHER_MODE dither_mode;    /* type of color dithering to use */
446  boolean two_pass_quantize;    /* TRUE=use two-pass color quantization */
447  int desired_number_of_colors; /* max # colors to use in created colormap */
448  /* these are significant only in buffered-image mode: */
449  boolean enable_1pass_quant;   /* enable future use of 1-pass quantizer */
450  boolean enable_external_quant;/* enable future use of external colormap */
451  boolean enable_2pass_quant;   /* enable future use of 2-pass quantizer */
452
453  /* Description of actual output image that will be returned to application.
454   * These fields are computed by jpeg_start_decompress().
455   * You can also use jpeg_calc_output_dimensions() to determine these values
456   * in advance of calling jpeg_start_decompress().
457   */
458
459  JDIMENSION output_width;      /* scaled image width */
460  JDIMENSION output_height;     /* scaled image height */
461  int out_color_components;     /* # of color components in out_color_space */
462  int output_components;        /* # of color components returned */
463  /* output_components is 1 (a colormap index) when quantizing colors;
464   * otherwise it equals out_color_components.
465   */
466  int rec_outbuf_height;        /* min recommended height of scanline buffer */
467  /* If the buffer passed to jpeg_read_scanlines() is less than this many rows
468   * high, space and time will be wasted due to unnecessary data copying.
469   * Usually rec_outbuf_height will be 1 or 2, at most 4.
470   */
471
472  /* When quantizing colors, the output colormap is described by these fields.
473   * The application can supply a colormap by setting colormap non-NULL before
474   * calling jpeg_start_decompress; otherwise a colormap is created during
475   * jpeg_start_decompress or jpeg_start_output.
476   * The map has out_color_components rows and actual_number_of_colors columns.
477   */
478  int actual_number_of_colors;  /* number of entries in use */
479  JSAMPARRAY colormap;          /* The color map as a 2-D pixel array */
480
481  /* State variables: these variables indicate the progress of decompression.
482   * The application may examine these but must not modify them.
483   */
484
485  /* Row index of next scanline to be read from jpeg_read_scanlines().
486   * Application may use this to control its processing loop, e.g.,
487   * "while (output_scanline < output_height)".
488   */
489  JDIMENSION output_scanline;   /* 0 .. output_height-1  */
490
491  /* Current input scan number and number of iMCU rows completed in scan.
492   * These indicate the progress of the decompressor input side.
493   */
494  int input_scan_number;        /* Number of SOS markers seen so far */
495  JDIMENSION input_iMCU_row;    /* Number of iMCU rows completed */
496
497  /* The "output scan number" is the notional scan being displayed by the
498   * output side.  The decompressor will not allow output scan/row number
499   * to get ahead of input scan/row, but it can fall arbitrarily far behind.
500   */
501  int output_scan_number;       /* Nominal scan number being displayed */
502  JDIMENSION output_iMCU_row;   /* Number of iMCU rows read */
503
504  /* Current progression status.  coef_bits[c][i] indicates the precision
505   * with which component c's DCT coefficient i (in zigzag order) is known.
506   * It is -1 when no data has yet been received, otherwise it is the point
507   * transform (shift) value for the most recent scan of the coefficient
508   * (thus, 0 at completion of the progression).
509   * This pointer is NULL when reading a non-progressive file.
510   */
511  int (*coef_bits)[DCTSIZE2];   /* -1 or current Al value for each coef */
512
513  /* Internal JPEG parameters --- the application usually need not look at
514   * these fields.  Note that the decompressor output side may not use
515   * any parameters that can change between scans.
516   */
517
518  /* Quantization and Huffman tables are carried forward across input
519   * datastreams when processing abbreviated JPEG datastreams.
520   */
521
522  JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
523  /* ptrs to coefficient quantization tables, or NULL if not defined */
524
525  JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
526  JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
527  /* ptrs to Huffman coding tables, or NULL if not defined */
528
529  /* These parameters are never carried across datastreams, since they
530   * are given in SOF/SOS markers or defined to be reset by SOI.
531   */
532
533  int data_precision;           /* bits of precision in image data */
534
535  jpeg_component_info * comp_info;
536  /* comp_info[i] describes component that appears i'th in SOF */
537
538  boolean progressive_mode;     /* TRUE if SOFn specifies progressive mode */
539  boolean arith_code;           /* TRUE=arithmetic coding, FALSE=Huffman */
540
541  UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
542  UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
543  UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
544
545  unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */
546
547  /* These fields record data obtained from optional markers recognized by
548   * the JPEG library.
549   */
550  boolean saw_JFIF_marker;      /* TRUE iff a JFIF APP0 marker was found */
551  /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
552  UINT8 JFIF_major_version;     /* JFIF version number */
553  UINT8 JFIF_minor_version;
554  UINT8 density_unit;           /* JFIF code for pixel size units */
555  UINT16 X_density;             /* Horizontal pixel density */
556  UINT16 Y_density;             /* Vertical pixel density */
557  boolean saw_Adobe_marker;     /* TRUE iff an Adobe APP14 marker was found */
558  UINT8 Adobe_transform;        /* Color transform code from Adobe marker */
559
560  boolean CCIR601_sampling;     /* TRUE=first samples are cosited */
561
562  /* Aside from the specific data retained from APPn markers known to the
563   * library, the uninterpreted contents of any or all APPn and COM markers
564   * can be saved in a list for examination by the application.
565   */
566  jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */
567
568  /* Remaining fields are known throughout decompressor, but generally
569   * should not be touched by a surrounding application.
570   */
571
572  /*
573   * These fields are computed during decompression startup
574   */
575  int max_h_samp_factor;        /* largest h_samp_factor */
576  int max_v_samp_factor;        /* largest v_samp_factor */
577
578  int min_DCT_scaled_size;      /* smallest DCT_scaled_size of any component */
579
580  JDIMENSION total_iMCU_rows;   /* # of iMCU rows in image */
581  /* The coefficient controller's input and output progress is measured in
582   * units of "iMCU" (interleaved MCU) rows.  These are the same as MCU rows
583   * in fully interleaved JPEG scans, but are used whether the scan is
584   * interleaved or not.  We define an iMCU row as v_samp_factor DCT block
585   * rows of each component.  Therefore, the IDCT output contains
586   * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row.
587   */
588
589  JSAMPLE * sample_range_limit; /* table for fast range-limiting */
590
591  /*
592   * These fields are valid during any one scan.
593   * They describe the components and MCUs actually appearing in the scan.
594   * Note that the decompressor output side must not use these fields.
595   */
596  int comps_in_scan;            /* # of JPEG components in this scan */
597  jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
598  /* *cur_comp_info[i] describes component that appears i'th in SOS */
599
600  JDIMENSION MCUs_per_row;      /* # of MCUs across the image */
601  JDIMENSION MCU_rows_in_scan;  /* # of MCU rows in the image */
602
603  int blocks_in_MCU;            /* # of DCT blocks per MCU */
604  int MCU_membership[D_MAX_BLOCKS_IN_MCU];
605  /* MCU_membership[i] is index in cur_comp_info of component owning */
606  /* i'th block in an MCU */
607
608  int Ss, Se, Ah, Al;           /* progressive JPEG parameters for scan */
609
610  /* This field is shared between entropy decoder and marker parser.
611   * It is either zero or the code of a JPEG marker that has been
612   * read from the data source, but has not yet been processed.
613   */
614  int unread_marker;
615
616  /*
617   * Links to decompression subobjects (methods, private variables of modules)
618   */
619  struct jpeg_decomp_master * master;
620  struct jpeg_d_main_controller * main;
621  struct jpeg_d_coef_controller * coef;
622  struct jpeg_d_post_controller * post;
623  struct jpeg_input_controller * inputctl;
624  struct jpeg_marker_reader * marker;
625  struct jpeg_entropy_decoder * entropy;
626  struct jpeg_inverse_dct * idct;
627  struct jpeg_upsampler * upsample;
628  struct jpeg_color_deconverter * cconvert;
629  struct jpeg_color_quantizer * cquantize;
630};
631
632
633/* "Object" declarations for JPEG modules that may be supplied or called
634 * directly by the surrounding application.
635 * As with all objects in the JPEG library, these structs only define the
636 * publicly visible methods and state variables of a module.  Additional
637 * private fields may exist after the public ones.
638 */
639
640
641/* Error handler object */
642
643struct jpeg_error_mgr {
644  /* Error exit handler: does not return to caller */
645  JMETHOD(void, error_exit, (j_common_ptr cinfo));
646  /* Conditionally emit a trace or warning message */
647  JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
648  /* Routine that actually outputs a trace or error message */
649  JMETHOD(void, output_message, (j_common_ptr cinfo));
650  /* Format a message string for the most recent JPEG error or message */
651  JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer));
652#define JMSG_LENGTH_MAX  200    /* recommended size of format_message buffer */
653  /* Reset error state variables at start of a new image */
654  JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));
655 
656  /* The message ID code and any parameters are saved here.
657   * A message can have one string parameter or up to 8 int parameters.
658   */
659  int msg_code;
660#define JMSG_STR_PARM_MAX  80
661  union {
662    int i[8];
663    char s[JMSG_STR_PARM_MAX];
664  } msg_parm;
665 
666  /* Standard state variables for error facility */
667 
668  int trace_level;              /* max msg_level that will be displayed */
669 
670  /* For recoverable corrupt-data errors, we emit a warning message,
671   * but keep going unless emit_message chooses to abort.  emit_message
672   * should count warnings in num_warnings.  The surrounding application
673   * can check for bad data by seeing if num_warnings is nonzero at the
674   * end of processing.
675   */
676  long num_warnings;            /* number of corrupt-data warnings */
677
678  /* These fields point to the table(s) of error message strings.
679   * An application can change the table pointer to switch to a different
680   * message list (typically, to change the language in which errors are
681   * reported).  Some applications may wish to add additional error codes
682   * that will be handled by the JPEG library error mechanism; the second
683   * table pointer is used for this purpose.
684   *
685   * First table includes all errors generated by JPEG library itself.
686   * Error code 0 is reserved for a "no such error string" message.
687   */
688  const char * const * jpeg_message_table; /* Library errors */
689  int last_jpeg_message;    /* Table contains strings 0..last_jpeg_message */
690  /* Second table can be added by application (see cjpeg/djpeg for example).
691   * It contains strings numbered first_addon_message..last_addon_message.
692   */
693  const char * const * addon_message_table; /* Non-library errors */
694  int first_addon_message;      /* code for first string in addon table */
695  int last_addon_message;       /* code for last string in addon table */
696};
697
698
699/* Progress monitor object */
700
701struct jpeg_progress_mgr {
702  JMETHOD(void, progress_monitor, (j_common_ptr cinfo));
703
704  long pass_counter;            /* work units completed in this pass */
705  long pass_limit;              /* total number of work units in this pass */
706  int completed_passes;         /* passes completed so far */
707  int total_passes;             /* total number of passes expected */
708};
709
710
711/* Data destination object for compression */
712
713struct jpeg_destination_mgr {
714  JOCTET * next_output_byte;    /* => next byte to write in buffer */
715  size_t free_in_buffer;        /* # of byte spaces remaining in buffer */
716
717  JMETHOD(void, init_destination, (j_compress_ptr cinfo));
718  JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo));
719  JMETHOD(void, term_destination, (j_compress_ptr cinfo));
720};
721
722
723/* Data source object for decompression */
724
725struct jpeg_source_mgr {
726  const JOCTET * next_input_byte; /* => next byte to read from buffer */
727  size_t bytes_in_buffer;       /* # of bytes remaining in buffer */
728
729  JMETHOD(void, init_source, (j_decompress_ptr cinfo));
730  JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo));
731  JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes));
732  JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired));
733  JMETHOD(void, term_source, (j_decompress_ptr cinfo));
734};
735
736
737/* Memory manager object.
738 * Allocates "small" objects (a few K total), "large" objects (tens of K),
739 * and "really big" objects (virtual arrays with backing store if needed).
740 * The memory manager does not allow individual objects to be freed; rather,
741 * each created object is assigned to a pool, and whole pools can be freed
742 * at once.  This is faster and more convenient than remembering exactly what
743 * to free, especially where malloc()/free() are not too speedy.
744 * NB: alloc routines never return NULL.  They exit to error_exit if not
745 * successful.
746 */
747
748#define JPOOL_PERMANENT 0       /* lasts until master record is destroyed */
749#define JPOOL_IMAGE     1       /* lasts until done with image/datastream */
750#define JPOOL_NUMPOOLS  2
751
752typedef struct jvirt_sarray_control * jvirt_sarray_ptr;
753typedef struct jvirt_barray_control * jvirt_barray_ptr;
754
755
756struct jpeg_memory_mgr {
757  /* Method pointers */
758  JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id,
759                                size_t sizeofobject));
760  JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id,
761                                     size_t sizeofobject));
762  JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id,
763                                     JDIMENSION samplesperrow,
764                                     JDIMENSION numrows));
765  JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id,
766                                      JDIMENSION blocksperrow,
767                                      JDIMENSION numrows));
768  JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo,
769                                                  int pool_id,
770                                                  boolean pre_zero,
771                                                  JDIMENSION samplesperrow,
772                                                  JDIMENSION numrows,
773                                                  JDIMENSION maxaccess));
774  JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo,
775                                                  int pool_id,
776                                                  boolean pre_zero,
777                                                  JDIMENSION blocksperrow,
778                                                  JDIMENSION numrows,
779                                                  JDIMENSION maxaccess));
780  JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo));
781  JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo,
782                                           jvirt_sarray_ptr ptr,
783                                           JDIMENSION start_row,
784                                           JDIMENSION num_rows,
785                                           boolean writable));
786  JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo,
787                                            jvirt_barray_ptr ptr,
788                                            JDIMENSION start_row,
789                                            JDIMENSION num_rows,
790                                            boolean writable));
791  JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id));
792  JMETHOD(void, self_destruct, (j_common_ptr cinfo));
793
794  /* Limit on memory allocation for this JPEG object.  (Note that this is
795   * merely advisory, not a guaranteed maximum; it only affects the space
796   * used for virtual-array buffers.)  May be changed by outer application
797   * after creating the JPEG object.
798   */
799  long max_memory_to_use;
800
801  /* Maximum allocation request accepted by alloc_large. */
802  long max_alloc_chunk;
803};
804
805
806/* Routine signature for application-supplied marker processing methods.
807 * Need not pass marker code since it is stored in cinfo->unread_marker.
808 */
809typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
810
811
812/* Declarations for routines called by application.
813 * The JPP macro hides prototype parameters from compilers that can't cope.
814 * Note JPP requires double parentheses.
815 */
816
817#ifdef HAVE_PROTOTYPES
818#define JPP(arglist)    arglist
819#else
820#define JPP(arglist)    ()
821#endif
822
823
824/* Short forms of external names for systems with brain-damaged linkers.
825 * We shorten external names to be unique in the first six letters, which
826 * is good enough for all known systems.
827 * (If your compiler itself needs names to be unique in less than 15
828 * characters, you are out of luck.  Get a better compiler.)
829 */
830
831#ifdef NEED_SHORT_EXTERNAL_NAMES
832#define jpeg_std_error          jStdError
833#define jpeg_CreateCompress     jCreaCompress
834#define jpeg_CreateDecompress   jCreaDecompress
835#define jpeg_destroy_compress   jDestCompress
836#define jpeg_destroy_decompress jDestDecompress
837#define jpeg_stdio_dest         jStdDest
838#define jpeg_stdio_src          jStdSrc
839#define jpeg_set_defaults       jSetDefaults
840#define jpeg_set_colorspace     jSetColorspace
841#define jpeg_default_colorspace jDefColorspace
842#define jpeg_set_quality        jSetQuality
843#define jpeg_set_linear_quality jSetLQuality
844#define jpeg_add_quant_table    jAddQuantTable
845#define jpeg_quality_scaling    jQualityScaling
846#define jpeg_simple_progression jSimProgress
847#define jpeg_suppress_tables    jSuppressTables
848#define jpeg_alloc_quant_table  jAlcQTable
849#define jpeg_alloc_huff_table   jAlcHTable
850#define jpeg_start_compress     jStrtCompress
851#define jpeg_write_scanlines    jWrtScanlines
852#define jpeg_finish_compress    jFinCompress
853#define jpeg_write_raw_data     jWrtRawData
854#define jpeg_write_marker       jWrtMarker
855#define jpeg_write_m_header     jWrtMHeader
856#define jpeg_write_m_byte       jWrtMByte
857#define jpeg_write_tables       jWrtTables
858#define jpeg_read_header        jReadHeader
859#define jpeg_start_decompress   jStrtDecompress
860#define jpeg_read_scanlines     jReadScanlines
861#define jpeg_finish_decompress  jFinDecompress
862#define jpeg_read_raw_data      jReadRawData
863#define jpeg_has_multiple_scans jHasMultScn
864#define jpeg_start_output       jStrtOutput
865#define jpeg_finish_output      jFinOutput
866#define jpeg_input_complete     jInComplete
867#define jpeg_new_colormap       jNewCMap
868#define jpeg_consume_input      jConsumeInput
869#define jpeg_calc_output_dimensions     jCalcDimensions
870#define jpeg_save_markers       jSaveMarkers
871#define jpeg_set_marker_processor       jSetMarker
872#define jpeg_read_coefficients  jReadCoefs
873#define jpeg_write_coefficients jWrtCoefs
874#define jpeg_copy_critical_parameters   jCopyCrit
875#define jpeg_abort_compress     jAbrtCompress
876#define jpeg_abort_decompress   jAbrtDecompress
877#define jpeg_abort              jAbort
878#define jpeg_destroy            jDestroy
879#define jpeg_resync_to_restart  jResyncRestart
880#endif /* NEED_SHORT_EXTERNAL_NAMES */
881
882#ifdef __cplusplus
883extern "C" {
884#endif
885
886/* Default error-management setup */
887EXTERN(struct jpeg_error_mgr *) jpeg_std_error
888        JPP((struct jpeg_error_mgr * err));
889
890/* Initialization of JPEG compression objects.
891 * jpeg_create_compress() and jpeg_create_decompress() are the exported
892 * names that applications should call.  These expand to calls on
893 * jpeg_CreateCompress and jpeg_CreateDecompress with additional information
894 * passed for version mismatch checking.
895 * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
896 */
897#define jpeg_create_compress(cinfo) \
898    jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
899                        (size_t) sizeof(struct jpeg_compress_struct))
900#define jpeg_create_decompress(cinfo) \
901    jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
902                          (size_t) sizeof(struct jpeg_decompress_struct))
903EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo,
904                                      int version, size_t structsize));
905EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo,
906                                        int version, size_t structsize));
907/* Destruction of JPEG compression objects */
908EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo));
909EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));
910
911/* Standard data source and destination managers: stdio streams. */
912/* Caller is responsible for opening the file before and closing after. */
913EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
914EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile));
915
916/* Default parameter setup for compression */
917EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo));
918/* Compression parameter setup aids */
919EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo,
920                                      J_COLOR_SPACE colorspace));
921EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo));
922EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality,
923                                   boolean force_baseline));
924EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo,
925                                          int scale_factor,
926                                          boolean force_baseline));
927EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl,
928                                       const unsigned int *basic_table,
929                                       int scale_factor,
930                                       boolean force_baseline));
931EXTERN(int) jpeg_quality_scaling JPP((int quality));
932EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo));
933EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo,
934                                       boolean suppress));
935EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo));
936EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo));
937
938/* Main entry points for compression */
939EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo,
940                                      boolean write_all_tables));
941EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo,
942                                             JSAMPARRAY scanlines,
943                                             JDIMENSION num_lines));
944EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo));
945
946/* Replaces jpeg_write_scanlines when writing raw downsampled data. */
947EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo,
948                                            JSAMPIMAGE data,
949                                            JDIMENSION num_lines));
950
951/* Write a special marker.  See libjpeg.doc concerning safe usage. */
952EXTERN(void) jpeg_write_marker
953        JPP((j_compress_ptr cinfo, int marker,
954             const JOCTET * dataptr, unsigned int datalen));
955/* Same, but piecemeal. */
956EXTERN(void) jpeg_write_m_header
957        JPP((j_compress_ptr cinfo, int marker, unsigned int datalen));
958EXTERN(void) jpeg_write_m_byte
959        JPP((j_compress_ptr cinfo, int val));
960
961/* Alternate compression function: just write an abbreviated table file */
962EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo));
963
964/* Decompression startup: read start of JPEG datastream to see what's there */
965EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo,
966                                  boolean require_image));
967/* Return value is one of: */
968#define JPEG_SUSPENDED          0 /* Suspended due to lack of input data */
969#define JPEG_HEADER_OK          1 /* Found valid image datastream */
970#define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */
971/* If you pass require_image = TRUE (normal case), you need not check for
972 * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
973 * JPEG_SUSPENDED is only possible if you use a data source module that can
974 * give a suspension return (the stdio source module doesn't).
975 */
976
977/* Main entry points for decompression */
978EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo));
979EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo,
980                                            JSAMPARRAY scanlines,
981                                            JDIMENSION max_lines));
982EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo));
983
984/* Replaces jpeg_read_scanlines when reading raw downsampled data. */
985EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo,
986                                           JSAMPIMAGE data,
987                                           JDIMENSION max_lines));
988
989/* Additional entry points for buffered-image mode. */
990EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo));
991EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo,
992                                       int scan_number));
993EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo));
994EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo));
995EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo));
996EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo));
997/* Return value is one of: */
998/* #define JPEG_SUSPENDED       0    Suspended due to lack of input data */
999#define JPEG_REACHED_SOS        1 /* Reached start of new scan */
1000#define JPEG_REACHED_EOI        2 /* Reached end of image */
1001#define JPEG_ROW_COMPLETED      3 /* Completed one iMCU row */
1002#define JPEG_SCAN_COMPLETED     4 /* Completed last iMCU row of a scan */
1003
1004/* Precalculate output dimensions for current decompression parameters. */
1005EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
1006
1007/* Control saving of COM and APPn markers into marker_list. */
1008EXTERN(void) jpeg_save_markers
1009        JPP((j_decompress_ptr cinfo, int marker_code,
1010             unsigned int length_limit));
1011
1012/* Install a special processing method for COM or APPn markers. */
1013EXTERN(void) jpeg_set_marker_processor
1014        JPP((j_decompress_ptr cinfo, int marker_code,
1015             jpeg_marker_parser_method routine));
1016
1017/* Read or write raw DCT coefficients --- useful for lossless transcoding. */
1018EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
1019EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo,
1020                                          jvirt_barray_ptr * coef_arrays));
1021EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo,
1022                                                j_compress_ptr dstinfo));
1023
1024/* If you choose to abort compression or decompression before completing
1025 * jpeg_finish_(de)compress, then you need to clean up to release memory,
1026 * temporary files, etc.  You can just call jpeg_destroy_(de)compress
1027 * if you're done with the JPEG object, but if you want to clean it up and
1028 * reuse it, call this:
1029 */
1030EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo));
1031EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo));
1032
1033/* Generic versions of jpeg_abort and jpeg_destroy that work on either
1034 * flavor of JPEG object.  These may be more convenient in some places.
1035 */
1036EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo));
1037EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo));
1038
1039/* Default restart-marker-resync procedure for use by data source modules */
1040EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo,
1041                                            int desired));
1042
1043#ifdef __cplusplus
1044}
1045#endif
1046
1047/* These marker codes are exported since applications and data source modules
1048 * are likely to want to use them.
1049 */
1050
1051#define JPEG_RST0       0xD0    /* RST0 marker code */
1052#define JPEG_EOI        0xD9    /* EOI marker code */
1053#define JPEG_APP0       0xE0    /* APP0 marker code */
1054#define JPEG_COM        0xFE    /* COM marker code */
1055
1056
1057/* If we have a brain-damaged compiler that emits warnings (or worse, errors)
1058 * for structure definitions that are never filled in, keep it quiet by
1059 * supplying dummy definitions for the various substructures.
1060 */
1061
1062#ifdef INCOMPLETE_TYPES_BROKEN
1063#ifndef JPEG_INTERNALS          /* will be defined in jpegint.h */
1064struct jvirt_sarray_control { long dummy; };
1065struct jvirt_barray_control { long dummy; };
1066struct jpeg_comp_master { long dummy; };
1067struct jpeg_c_main_controller { long dummy; };
1068struct jpeg_c_prep_controller { long dummy; };
1069struct jpeg_c_coef_controller { long dummy; };
1070struct jpeg_marker_writer { long dummy; };
1071struct jpeg_color_converter { long dummy; };
1072struct jpeg_downsampler { long dummy; };
1073struct jpeg_forward_dct { long dummy; };
1074struct jpeg_entropy_encoder { long dummy; };
1075struct jpeg_decomp_master { long dummy; };
1076struct jpeg_d_main_controller { long dummy; };
1077struct jpeg_d_coef_controller { long dummy; };
1078struct jpeg_d_post_controller { long dummy; };
1079struct jpeg_input_controller { long dummy; };
1080struct jpeg_marker_reader { long dummy; };
1081struct jpeg_entropy_decoder { long dummy; };
1082struct jpeg_inverse_dct { long dummy; };
1083struct jpeg_upsampler { long dummy; };
1084struct jpeg_color_deconverter { long dummy; };
1085struct jpeg_color_quantizer { long dummy; };
1086#endif /* JPEG_INTERNALS */
1087#endif /* INCOMPLETE_TYPES_BROKEN */
1088
1089
1090/*
1091 * The JPEG library modules define JPEG_INTERNALS before including this file.
1092 * The internal structure declarations are read only when that is true.
1093 * Applications using the library should not include jpegint.h, but may wish
1094 * to include jerror.h.
1095 */
1096
1097#ifdef JPEG_INTERNALS
1098#include "jpegint.h"            /* fetch private declarations */
1099#include "jerror.h"             /* fetch error codes too */
1100#endif
1101
1102#endif /* JPEGLIB_H */
Note: See TracBrowser for help on using the repository browser.