root/src/jpeg-6/jpeglib.h @ 121:8a250ae917ed

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import tremulous r1086
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1/*
2 * jpeglib.h
3 *
4 * Copyright (C) 1991-1995, 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
16typedef unsigned char boolean;
17/*
18 * First we include the configuration files that record how this
19 * installation of the JPEG library is set up.  jconfig.h can be
20 * generated automatically for many systems.  jmorecfg.h contains
21 * manual configuration options that most people need not worry about.
22 */
23
24#ifndef JCONFIG_INCLUDED        /* in case jinclude.h already did */
25#include "../jpeg-6/jconfig.h"          /* widely used configuration options */
26#endif
27#include "../jpeg-6/jmorecfg.h"         /* seldom changed options */
28
29
30/* Version ID for the JPEG library.
31 * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60".
32 */
33
34#define JPEG_LIB_VERSION  60    /* Version 6 */
35
36
37/* Various constants determining the sizes of things.
38 * All of these are specified by the JPEG standard, so don't change them
39 * if you want to be compatible.
40 */
41
42#define DCTSIZE             8   /* The basic DCT block is 8x8 samples */
43#define DCTSIZE2            64  /* DCTSIZE squared; # of elements in a block */
44#define NUM_QUANT_TBLS      4   /* Quantization tables are numbered 0..3 */
45#define NUM_HUFF_TBLS       4   /* Huffman tables are numbered 0..3 */
46#define NUM_ARITH_TBLS      16  /* Arith-coding tables are numbered 0..15 */
47#define MAX_COMPS_IN_SCAN   4   /* JPEG limit on # of components in one scan */
48#define MAX_SAMP_FACTOR     4   /* JPEG limit on sampling factors */
49/* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
50 * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
51 * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
52 * to handle it.  We even let you do this from the jconfig.h file.  However,
53 * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
54 * sometimes emits noncompliant files doesn't mean you should too.
55 */
56#define C_MAX_BLOCKS_IN_MCU   10 /* compressor's limit on blocks per MCU */
57#ifndef D_MAX_BLOCKS_IN_MCU
58#define D_MAX_BLOCKS_IN_MCU   10 /* decompressor's limit on blocks per MCU */
59#endif
60
61
62/* This macro is used to declare a "method", that is, a function pointer.
63 * We want to supply prototype parameters if the compiler can cope.
64 * Note that the arglist parameter must be parenthesized!
65 */
66
67#ifdef HAVE_PROTOTYPES
68#define JMETHOD(type,methodname,arglist)  type (*methodname) arglist
69#else
70#define JMETHOD(type,methodname,arglist)  type (*methodname) ()
71#endif
72
73
74/* Data structures for images (arrays of samples and of DCT coefficients).
75 * On 80x86 machines, the image arrays are too big for near pointers,
76 * but the pointer arrays can fit in near memory.
77 */
78
79typedef JSAMPLE FAR *JSAMPROW;  /* ptr to one image row of pixel samples. */
80typedef JSAMPROW *JSAMPARRAY;   /* ptr to some rows (a 2-D sample array) */
81typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */
82
83typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */
84typedef JBLOCK FAR *JBLOCKROW;  /* pointer to one row of coefficient blocks */
85typedef JBLOCKROW *JBLOCKARRAY;         /* a 2-D array of coefficient blocks */
86typedef JBLOCKARRAY *JBLOCKIMAGE;       /* a 3-D array of coefficient blocks */
87
88typedef JCOEF FAR *JCOEFPTR;    /* useful in a couple of places */
89
90
91/* Types for JPEG compression parameters and working tables. */
92
93
94/* DCT coefficient quantization tables. */
95
96typedef struct {
97  /* This field directly represents the contents of a JPEG DQT marker.
98   * Note: the values are always given in zigzag order.
99   */
100  UINT16 quantval[DCTSIZE2];    /* quantization step for each coefficient */
101  /* This field is used only during compression.  It's initialized FALSE when
102   * the table is created, and set TRUE when it's been output to the file.
103   * You could suppress output of a table by setting this to TRUE.
104   * (See jpeg_suppress_tables for an example.)
105   */
106  boolean sent_table;           /* TRUE when table has been output */
107} JQUANT_TBL;
108
109
110/* Huffman coding tables. */
111
112typedef struct {
113  /* These two fields directly represent the contents of a JPEG DHT marker */
114  UINT8 bits[17];               /* bits[k] = # of symbols with codes of */
115                                /* length k bits; bits[0] is unused */
116  UINT8 huffval[256];           /* The symbols, in order of incr code length */
117  /* This field is used only during compression.  It's initialized FALSE when
118   * the table is created, and set TRUE when it's been output to the file.
119   * You could suppress output of a table by setting this to TRUE.
120   * (See jpeg_suppress_tables for an example.)
121   */
122  boolean sent_table;           /* TRUE when table has been output */
123} JHUFF_TBL;
124
125
126/* Basic info about one component (color channel). */
127
128typedef struct {
129  /* These values are fixed over the whole image. */
130  /* For compression, they must be supplied by parameter setup; */
131  /* for decompression, they are read from the SOF marker. */
132  int component_id;             /* identifier for this component (0..255) */
133  int component_index;          /* its index in SOF or cinfo->comp_info[] */
134  int h_samp_factor;            /* horizontal sampling factor (1..4) */
135  int v_samp_factor;            /* vertical sampling factor (1..4) */
136  int quant_tbl_no;             /* quantization table selector (0..3) */
137  /* These values may vary between scans. */
138  /* For compression, they must be supplied by parameter setup; */
139  /* for decompression, they are read from the SOS marker. */
140  /* The decompressor output side may not use these variables. */
141  int dc_tbl_no;                /* DC entropy table selector (0..3) */
142  int ac_tbl_no;                /* AC entropy table selector (0..3) */
143 
144  /* Remaining fields should be treated as private by applications. */
145 
146  /* These values are computed during compression or decompression startup: */
147  /* Component's size in DCT blocks.
148   * Any dummy blocks added to complete an MCU are not counted; therefore
149   * these values do not depend on whether a scan is interleaved or not.
150   */
151  JDIMENSION width_in_blocks;
152  JDIMENSION height_in_blocks;
153  /* Size of a DCT block in samples.  Always DCTSIZE for compression.
154   * For decompression this is the size of the output from one DCT block,
155   * reflecting any scaling we choose to apply during the IDCT step.
156   * Values of 1,2,4,8 are likely to be supported.  Note that different
157   * components may receive different IDCT scalings.
158   */
159  int DCT_scaled_size;
160  /* The downsampled dimensions are the component's actual, unpadded number
161   * of samples at the main buffer (preprocessing/compression interface), thus
162   * downsampled_width = ceil(image_width * Hi/Hmax)
163   * and similarly for height.  For decompression, IDCT scaling is included, so
164   * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE)
165   */
166  JDIMENSION downsampled_width;  /* actual width in samples */
167  JDIMENSION downsampled_height; /* actual height in samples */
168  /* This flag is used only for decompression.  In cases where some of the
169   * components will be ignored (eg grayscale output from YCbCr image),
170   * we can skip most computations for the unused components.
171   */
172  boolean component_needed;     /* do we need the value of this component? */
173
174  /* These values are computed before starting a scan of the component. */
175  /* The decompressor output side may not use these variables. */
176  int MCU_width;                /* number of blocks per MCU, horizontally */
177  int MCU_height;               /* number of blocks per MCU, vertically */
178  int MCU_blocks;               /* MCU_width * MCU_height */
179  int MCU_sample_width;         /* MCU width in samples, MCU_width*DCT_scaled_size */
180  int last_col_width;           /* # of non-dummy blocks across in last MCU */
181  int last_row_height;          /* # of non-dummy blocks down in last MCU */
182
183  /* Saved quantization table for component; NULL if none yet saved.
184   * See jdinput.c comments about the need for this information.
185   * This field is not currently used by the compressor.
186   */
187  JQUANT_TBL * quant_table;
188
189  /* Private per-component storage for DCT or IDCT subsystem. */
190  void * dct_table;
191} jpeg_component_info;
192
193
194/* The script for encoding a multiple-scan file is an array of these: */
195
196typedef struct {
197  int comps_in_scan;            /* number of components encoded in this scan */
198  int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */
199  int Ss, Se;                   /* progressive JPEG spectral selection parms */
200  int Ah, Al;                   /* progressive JPEG successive approx. parms */
201} jpeg_scan_info;
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  boolean is_decompressor;      /* so common code can tell which is which */\
246  int global_state              /* for checking call sequence validity */
247
248/* Routines that are to be used by both halves of the library are declared
249 * to receive a pointer to this structure.  There are no actual instances of
250 * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
251 */
252struct jpeg_common_struct {
253  jpeg_common_fields;           /* Fields common to both master struct types */
254  /* Additional fields follow in an actual jpeg_compress_struct or
255   * jpeg_decompress_struct.  All three structs must agree on these
256   * initial fields!  (This would be a lot cleaner in C++.)
257   */
258};
259
260typedef struct jpeg_common_struct * j_common_ptr;
261typedef struct jpeg_compress_struct * j_compress_ptr;
262typedef struct jpeg_decompress_struct * j_decompress_ptr;
263
264
265/* Master record for a compression instance */
266
267struct jpeg_compress_struct {
268  jpeg_common_fields;           /* Fields shared with jpeg_decompress_struct */
269
270  /* Destination for compressed data */
271  struct jpeg_destination_mgr * dest;
272
273  /* Description of source image --- these fields must be filled in by
274   * outer application before starting compression.  in_color_space must
275   * be correct before you can even call jpeg_set_defaults().
276   */
277
278  JDIMENSION image_width;       /* input image width */
279  JDIMENSION image_height;      /* input image height */
280  int input_components;         /* # of color components in input image */
281  J_COLOR_SPACE in_color_space; /* colorspace of input image */
282
283  double input_gamma;           /* image gamma of input image */
284
285  /* Compression parameters --- these fields must be set before calling
286   * jpeg_start_compress().  We recommend calling jpeg_set_defaults() to
287   * initialize everything to reasonable defaults, then changing anything
288   * the application specifically wants to change.  That way you won't get
289   * burnt when new parameters are added.  Also note that there are several
290   * helper routines to simplify changing parameters.
291   */
292
293  int data_precision;           /* bits of precision in image data */
294
295  int num_components;           /* # of color components in JPEG image */
296  J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
297
298  jpeg_component_info * comp_info;
299  /* comp_info[i] describes component that appears i'th in SOF */
300 
301  JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
302  /* ptrs to coefficient quantization tables, or NULL if not defined */
303 
304  JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
305  JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
306  /* ptrs to Huffman coding tables, or NULL if not defined */
307 
308  UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
309  UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
310  UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
311
312  int num_scans;                /* # of entries in scan_info array */
313  const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */
314  /* The default value of scan_info is NULL, which causes a single-scan
315   * sequential JPEG file to be emitted.  To create a multi-scan file,
316   * set num_scans and scan_info to point to an array of scan definitions.
317   */
318
319  boolean raw_data_in;          /* TRUE=caller supplies downsampled data */
320  boolean arith_code;           /* TRUE=arithmetic coding, FALSE=Huffman */
321  boolean optimize_coding;      /* TRUE=optimize entropy encoding parms */
322  boolean CCIR601_sampling;     /* TRUE=first samples are cosited */
323  int smoothing_factor;         /* 1..100, or 0 for no input smoothing */
324  J_DCT_METHOD dct_method;      /* DCT algorithm selector */
325
326  /* The restart interval can be specified in absolute MCUs by setting
327   * restart_interval, or in MCU rows by setting restart_in_rows
328   * (in which case the correct restart_interval will be figured
329   * for each scan).
330   */
331  unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
332  int restart_in_rows;          /* if > 0, MCU rows per restart interval */
333
334  /* Parameters controlling emission of special markers. */
335
336  boolean write_JFIF_header;    /* should a JFIF marker be written? */
337  /* These three values are not used by the JPEG code, merely copied */
338  /* into the JFIF APP0 marker.  density_unit can be 0 for unknown, */
339  /* 1 for dots/inch, or 2 for dots/cm.  Note that the pixel aspect */
340  /* ratio is defined by X_density/Y_density even when density_unit=0. */
341  UINT8 density_unit;           /* JFIF code for pixel size units */
342  UINT16 X_density;             /* Horizontal pixel density */
343  UINT16 Y_density;             /* Vertical pixel density */
344  boolean write_Adobe_marker;   /* should an Adobe marker be written? */
345 
346  /* State variable: index of next scanline to be written to
347   * jpeg_write_scanlines().  Application may use this to control its
348   * processing loop, e.g., "while (next_scanline < image_height)".
349   */
350
351  JDIMENSION next_scanline;     /* 0 .. image_height-1  */
352
353  /* Remaining fields are known throughout compressor, but generally
354   * should not be touched by a surrounding application.
355   */
356
357  /*
358   * These fields are computed during compression startup
359   */
360  boolean progressive_mode;     /* TRUE if scan script uses progressive mode */
361  int max_h_samp_factor;        /* largest h_samp_factor */
362  int max_v_samp_factor;        /* largest v_samp_factor */
363
364  JDIMENSION total_iMCU_rows;   /* # of iMCU rows to be input to coef ctlr */
365  /* The coefficient controller receives data in units of MCU rows as defined
366   * for fully interleaved scans (whether the JPEG file is interleaved or not).
367   * There are v_samp_factor * DCTSIZE sample rows of each component in an
368   * "iMCU" (interleaved MCU) row.
369   */
370 
371  /*
372   * These fields are valid during any one scan.
373   * They describe the components and MCUs actually appearing in the scan.
374   */
375  int comps_in_scan;            /* # of JPEG components in this scan */
376  jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
377  /* *cur_comp_info[i] describes component that appears i'th in SOS */
378 
379  JDIMENSION MCUs_per_row;      /* # of MCUs across the image */
380  JDIMENSION MCU_rows_in_scan;  /* # of MCU rows in the image */
381 
382  int blocks_in_MCU;            /* # of DCT blocks per MCU */
383  int MCU_membership[C_MAX_BLOCKS_IN_MCU];
384  /* MCU_membership[i] is index in cur_comp_info of component owning */
385  /* i'th block in an MCU */
386
387  int Ss, Se, Ah, Al;           /* progressive JPEG parameters for scan */
388
389  /*
390   * Links to compression subobjects (methods and private variables of modules)
391   */
392  struct jpeg_comp_master * master;
393  struct jpeg_c_main_controller * main;
394  struct jpeg_c_prep_controller * prep;
395  struct jpeg_c_coef_controller * coef;
396  struct jpeg_marker_writer * marker;
397  struct jpeg_color_converter * cconvert;
398  struct jpeg_downsampler * downsample;
399  struct jpeg_forward_dct * fdct;
400  struct jpeg_entropy_encoder * entropy;
401};
402
403
404/* Master record for a decompression instance */
405
406struct jpeg_decompress_struct {
407  jpeg_common_fields;           /* Fields shared with jpeg_compress_struct */
408
409  /* Source of compressed data */
410  struct jpeg_source_mgr * src;
411
412  /* Basic description of image --- filled in by jpeg_read_header(). */
413  /* Application may inspect these values to decide how to process image. */
414
415  JDIMENSION image_width;       /* nominal image width (from SOF marker) */
416  JDIMENSION image_height;      /* nominal image height */
417  int num_components;           /* # of color components in JPEG image */
418  J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
419
420  /* Decompression processing parameters --- these fields must be set before
421   * calling jpeg_start_decompress().  Note that jpeg_read_header() initializes
422   * them to default values.
423   */
424
425  J_COLOR_SPACE out_color_space; /* colorspace for output */
426
427  unsigned int scale_num, scale_denom; /* fraction by which to scale image */
428
429  double output_gamma;          /* image gamma wanted in output */
430
431  boolean buffered_image;       /* TRUE=multiple output passes */
432  boolean raw_data_out;         /* TRUE=downsampled data wanted */
433
434  J_DCT_METHOD dct_method;      /* IDCT algorithm selector */
435  boolean do_fancy_upsampling;  /* TRUE=apply fancy upsampling */
436  boolean do_block_smoothing;   /* TRUE=apply interblock smoothing */
437
438  boolean quantize_colors;      /* TRUE=colormapped output wanted */
439  /* the following are ignored if not quantize_colors: */
440  J_DITHER_MODE dither_mode;    /* type of color dithering to use */
441  boolean two_pass_quantize;    /* TRUE=use two-pass color quantization */
442  int desired_number_of_colors; /* max # colors to use in created colormap */
443  /* these are significant only in buffered-image mode: */
444  boolean enable_1pass_quant;   /* enable future use of 1-pass quantizer */
445  boolean enable_external_quant;/* enable future use of external colormap */
446  boolean enable_2pass_quant;   /* enable future use of 2-pass quantizer */
447
448  /* Description of actual output image that will be returned to application.
449   * These fields are computed by jpeg_start_decompress().
450   * You can also use jpeg_calc_output_dimensions() to determine these values
451   * in advance of calling jpeg_start_decompress().
452   */
453
454  JDIMENSION output_width;      /* scaled image width */
455  JDIMENSION output_height;     /* scaled image height */
456  int out_color_components;     /* # of color components in out_color_space */
457  int output_components;        /* # of color components returned */
458  /* output_components is 1 (a colormap index) when quantizing colors;
459   * otherwise it equals out_color_components.
460   */
461  int rec_outbuf_height;        /* min recommended height of scanline buffer */
462  /* If the buffer passed to jpeg_read_scanlines() is less than this many rows
463   * high, space and time will be wasted due to unnecessary data copying.
464   * Usually rec_outbuf_height will be 1 or 2, at most 4.
465   */
466
467  /* When quantizing colors, the output colormap is described by these fields.
468   * The application can supply a colormap by setting colormap non-NULL before
469   * calling jpeg_start_decompress; otherwise a colormap is created during
470   * jpeg_start_decompress or jpeg_start_output.
471   * The map has out_color_components rows and actual_number_of_colors columns.
472   */
473  int actual_number_of_colors;  /* number of entries in use */
474  JSAMPARRAY colormap;          /* The color map as a 2-D pixel array */
475
476  /* State variables: these variables indicate the progress of decompression.
477   * The application may examine these but must not modify them.
478   */
479
480  /* Row index of next scanline to be read from jpeg_read_scanlines().
481   * Application may use this to control its processing loop, e.g.,
482   * "while (output_scanline < output_height)".
483   */
484  JDIMENSION output_scanline;   /* 0 .. output_height-1  */
485
486  /* Current input scan number and number of iMCU rows completed in scan.
487   * These indicate the progress of the decompressor input side.
488   */
489  int input_scan_number;        /* Number of SOS markers seen so far */
490  JDIMENSION input_iMCU_row;    /* Number of iMCU rows completed */
491
492  /* The "output scan number" is the notional scan being displayed by the
493   * output side.  The decompressor will not allow output scan/row number
494   * to get ahead of input scan/row, but it can fall arbitrarily far behind.
495   */
496  int output_scan_number;       /* Nominal scan number being displayed */
497  JDIMENSION output_iMCU_row;   /* Number of iMCU rows read */
498
499  /* Current progression status.  coef_bits[c][i] indicates the precision
500   * with which component c's DCT coefficient i (in zigzag order) is known.
501   * It is -1 when no data has yet been received, otherwise it is the point
502   * transform (shift) value for the most recent scan of the coefficient
503   * (thus, 0 at completion of the progression).
504   * This pointer is NULL when reading a non-progressive file.
505   */
506  int (*coef_bits)[DCTSIZE2];   /* -1 or current Al value for each coef */
507
508  /* Internal JPEG parameters --- the application usually need not look at
509   * these fields.  Note that the decompressor output side may not use
510   * any parameters that can change between scans.
511   */
512
513  /* Quantization and Huffman tables are carried forward across input
514   * datastreams when processing abbreviated JPEG datastreams.
515   */
516
517  JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
518  /* ptrs to coefficient quantization tables, or NULL if not defined */
519
520  JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
521  JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
522  /* ptrs to Huffman coding tables, or NULL if not defined */
523
524  /* These parameters are never carried across datastreams, since they
525   * are given in SOF/SOS markers or defined to be reset by SOI.
526   */
527
528  int data_precision;           /* bits of precision in image data */
529
530  jpeg_component_info * comp_info;
531  /* comp_info[i] describes component that appears i'th in SOF */
532
533  boolean progressive_mode;     /* TRUE if SOFn specifies progressive mode */
534  boolean arith_code;           /* TRUE=arithmetic coding, FALSE=Huffman */
535
536  UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
537  UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
538  UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
539
540  unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */
541
542  /* These fields record data obtained from optional markers recognized by
543   * the JPEG library.
544   */
545  boolean saw_JFIF_marker;      /* TRUE iff a JFIF APP0 marker was found */
546  /* Data copied from JFIF marker: */
547  UINT8 density_unit;           /* JFIF code for pixel size units */
548  UINT16 X_density;             /* Horizontal pixel density */
549  UINT16 Y_density;             /* Vertical pixel density */
550  boolean saw_Adobe_marker;     /* TRUE iff an Adobe APP14 marker was found */
551  UINT8 Adobe_transform;        /* Color transform code from Adobe marker */
552
553  boolean CCIR601_sampling;     /* TRUE=first samples are cosited */
554
555  /* Remaining fields are known throughout decompressor, but generally
556   * should not be touched by a surrounding application.
557   */
558
559  /*
560   * These fields are computed during decompression startup
561   */
562  int max_h_samp_factor;        /* largest h_samp_factor */
563  int max_v_samp_factor;        /* largest v_samp_factor */
564
565  int min_DCT_scaled_size;      /* smallest DCT_scaled_size of any component */
566
567  JDIMENSION total_iMCU_rows;   /* # of iMCU rows in image */
568  /* The coefficient controller's input and output progress is measured in
569   * units of "iMCU" (interleaved MCU) rows.  These are the same as MCU rows
570   * in fully interleaved JPEG scans, but are used whether the scan is
571   * interleaved or not.  We define an iMCU row as v_samp_factor DCT block
572   * rows of each component.  Therefore, the IDCT output contains
573   * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row.
574   */
575
576  JSAMPLE * sample_range_limit; /* table for fast range-limiting */
577
578  /*
579   * These fields are valid during any one scan.
580   * They describe the components and MCUs actually appearing in the scan.
581   * Note that the decompressor output side must not use these fields.
582   */
583  int comps_in_scan;            /* # of JPEG components in this scan */
584  jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
585  /* *cur_comp_info[i] describes component that appears i'th in SOS */
586
587  JDIMENSION MCUs_per_row;      /* # of MCUs across the image */
588  JDIMENSION MCU_rows_in_scan;  /* # of MCU rows in the image */
589
590  int blocks_in_MCU;            /* # of DCT blocks per MCU */
591  int MCU_membership[D_MAX_BLOCKS_IN_MCU];
592  /* MCU_membership[i] is index in cur_comp_info of component owning */
593  /* i'th block in an MCU */
594
595  int Ss, Se, Ah, Al;           /* progressive JPEG parameters for scan */
596
597  /* This field is shared between entropy decoder and marker parser.
598   * It is either zero or the code of a JPEG marker that has been
599   * read from the data source, but has not yet been processed.
600   */
601  int unread_marker;
602
603  /*
604   * Links to decompression subobjects (methods, private variables of modules)
605   */
606  struct jpeg_decomp_master * master;
607  struct jpeg_d_main_controller * main;
608  struct jpeg_d_coef_controller * coef;
609  struct jpeg_d_post_controller * post;
610  struct jpeg_input_controller * inputctl;
611  struct jpeg_marker_reader * marker;
612  struct jpeg_entropy_decoder * entropy;
613  struct jpeg_inverse_dct * idct;
614  struct jpeg_upsampler * upsample;
615  struct jpeg_color_deconverter * cconvert;
616  struct jpeg_color_quantizer * cquantize;
617};
618
619
620/* "Object" declarations for JPEG modules that may be supplied or called
621 * directly by the surrounding application.
622 * As with all objects in the JPEG library, these structs only define the
623 * publicly visible methods and state variables of a module.  Additional
624 * private fields may exist after the public ones.
625 */
626
627
628/* Error handler object */
629
630struct jpeg_error_mgr {
631  /* Error exit handler: does not return to caller */
632  JMETHOD(void, error_exit, (j_common_ptr cinfo));
633  /* Conditionally emit a trace or warning message */
634  JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
635  /* Routine that actually outputs a trace or error message */
636  JMETHOD(void, output_message, (j_common_ptr cinfo));
637  /* Format a message string for the most recent JPEG error or message */
638  JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer));
639#define JMSG_LENGTH_MAX  200    /* recommended size of format_message buffer */
640  /* Reset error state variables at start of a new image */
641  JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));
642 
643  /* The message ID code and any parameters are saved here.
644   * A message can have one string parameter or up to 8 int parameters.
645   */
646  int msg_code;
647#define JMSG_STR_PARM_MAX  80
648  union {
649    int i[8];
650    char s[JMSG_STR_PARM_MAX];
651  } msg_parm;
652 
653  /* Standard state variables for error facility */
654 
655  int trace_level;              /* max msg_level that will be displayed */
656 
657  /* For recoverable corrupt-data errors, we emit a warning message,
658   * but keep going unless emit_message chooses to abort.  emit_message
659   * should count warnings in num_warnings.  The surrounding application
660   * can check for bad data by seeing if num_warnings is nonzero at the
661   * end of processing.
662   */
663  long num_warnings;            /* number of corrupt-data warnings */
664
665  /* These fields point to the table(s) of error message strings.
666   * An application can change the table pointer to switch to a different
667   * message list (typically, to change the language in which errors are
668   * reported).  Some applications may wish to add additional error codes
669   * that will be handled by the JPEG library error mechanism; the second
670   * table pointer is used for this purpose.
671   *
672   * First table includes all errors generated by JPEG library itself.
673   * Error code 0 is reserved for a "no such error string" message.
674   */
675  const char * const * jpeg_message_table; /* Library errors */
676  int last_jpeg_message;    /* Table contains strings 0..last_jpeg_message */
677  /* Second table can be added by application (see cjpeg/djpeg for example).
678   * It contains strings numbered first_addon_message..last_addon_message.
679   */
680  const char * const * addon_message_table; /* Non-library errors */
681  int first_addon_message;      /* code for first string in addon table */
682  int last_addon_message;       /* code for last string in addon table */
683};
684
685
686/* Progress monitor object */
687
688struct jpeg_progress_mgr {
689  JMETHOD(void, progress_monitor, (j_common_ptr cinfo));
690
691  long pass_counter;            /* work units completed in this pass */
692  long pass_limit;              /* total number of work units in this pass */
693  int completed_passes;         /* passes completed so far */
694  int total_passes;             /* total number of passes expected */
695};
696
697
698/* Data destination object for compression */
699
700struct jpeg_destination_mgr {
701  JOCTET * next_output_byte;    /* => next byte to write in buffer */
702  size_t free_in_buffer;        /* # of byte spaces remaining in buffer */
703
704  JMETHOD(void, init_destination, (j_compress_ptr cinfo));
705  JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo));
706  JMETHOD(void, term_destination, (j_compress_ptr cinfo));
707};
708
709
710/* Data source object for decompression */
711
712struct jpeg_source_mgr {
713  const JOCTET * next_input_byte; /* => next byte to read from buffer */
714  size_t bytes_in_buffer;       /* # of bytes remaining in buffer */
715
716  JMETHOD(void, init_source, (j_decompress_ptr cinfo));
717  JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo));
718  JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes));
719  JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired));
720  JMETHOD(void, term_source, (j_decompress_ptr cinfo));
721};
722
723
724/* Memory manager object.
725 * Allocates "small" objects (a few K total), "large" objects (tens of K),
726 * and "really big" objects (virtual arrays with backing store if needed).
727 * The memory manager does not allow individual objects to be freed; rather,
728 * each created object is assigned to a pool, and whole pools can be freed
729 * at once.  This is faster and more convenient than remembering exactly what
730 * to free, especially where malloc()/free() are not too speedy.
731 * NB: alloc routines never return NULL.  They exit to error_exit if not
732 * successful.
733 */
734
735#define JPOOL_PERMANENT 0       /* lasts until master record is destroyed */
736#define JPOOL_IMAGE     1       /* lasts until done with image/datastream */
737#define JPOOL_NUMPOOLS  2
738
739typedef struct jvirt_sarray_control * jvirt_sarray_ptr;
740typedef struct jvirt_barray_control * jvirt_barray_ptr;
741
742
743struct jpeg_memory_mgr {
744  /* Method pointers */
745  JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id,
746                                size_t sizeofobject));
747  JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id,
748                                     size_t sizeofobject));
749  JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id,
750                                     JDIMENSION samplesperrow,
751                                     JDIMENSION numrows));
752  JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id,
753                                      JDIMENSION blocksperrow,
754                                      JDIMENSION numrows));
755  JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo,
756                                                  int pool_id,
757                                                  boolean pre_zero,
758                                                  JDIMENSION samplesperrow,
759                                                  JDIMENSION numrows,
760                                                  JDIMENSION maxaccess));
761  JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo,
762                                                  int pool_id,
763                                                  boolean pre_zero,
764                                                  JDIMENSION blocksperrow,
765                                                  JDIMENSION numrows,
766                                                  JDIMENSION maxaccess));
767  JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo));
768  JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo,
769                                           jvirt_sarray_ptr ptr,
770                                           JDIMENSION start_row,
771                                           JDIMENSION num_rows,
772                                           boolean writable));
773  JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo,
774                                            jvirt_barray_ptr ptr,
775                                            JDIMENSION start_row,
776                                            JDIMENSION num_rows,
777                                            boolean writable));
778  JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id));
779  JMETHOD(void, self_destruct, (j_common_ptr cinfo));
780
781  /* Limit on memory allocation for this JPEG object.  (Note that this is
782   * merely advisory, not a guaranteed maximum; it only affects the space
783   * used for virtual-array buffers.)  May be changed by outer application
784   * after creating the JPEG object.
785   */
786  long max_memory_to_use;
787};
788
789
790/* Routine signature for application-supplied marker processing methods.
791 * Need not pass marker code since it is stored in cinfo->unread_marker.
792 */
793typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
794
795
796/* Declarations for routines called by application.
797 * The JPP macro hides prototype parameters from compilers that can't cope.
798 * Note JPP requires double parentheses.
799 */
800
801#ifdef HAVE_PROTOTYPES
802#define JPP(arglist)    arglist
803#else
804#define JPP(arglist)    ()
805#endif
806
807
808/* Short forms of external names for systems with brain-damaged linkers.
809 * We shorten external names to be unique in the first six letters, which
810 * is good enough for all known systems.
811 * (If your compiler itself needs names to be unique in less than 15
812 * characters, you are out of luck.  Get a better compiler.)
813 */
814
815#ifdef NEED_SHORT_EXTERNAL_NAMES
816#define jpeg_std_error          jStdError
817#define jpeg_create_compress    jCreaCompress
818#define jpeg_create_decompress  jCreaDecompress
819#define jpeg_destroy_compress   jDestCompress
820#define jpeg_destroy_decompress jDestDecompress
821#define jpeg_stdio_dest         jStdDest
822#define jpeg_stdio_src          jStdSrc
823#define jpeg_set_defaults       jSetDefaults
824#define jpeg_set_colorspace     jSetColorspace
825#define jpeg_default_colorspace jDefColorspace
826#define jpeg_set_quality        jSetQuality
827#define jpeg_set_linear_quality jSetLQuality
828#define jpeg_add_quant_table    jAddQuantTable
829#define jpeg_quality_scaling    jQualityScaling
830#define jpeg_simple_progression jSimProgress
831#define jpeg_suppress_tables    jSuppressTables
832#define jpeg_alloc_quant_table  jAlcQTable
833#define jpeg_alloc_huff_table   jAlcHTable
834#define jpeg_start_compress     jStrtCompress
835#define jpeg_write_scanlines    jWrtScanlines
836#define jpeg_finish_compress    jFinCompress
837#define jpeg_write_raw_data     jWrtRawData
838#define jpeg_write_marker       jWrtMarker
839#define jpeg_write_tables       jWrtTables
840#define jpeg_read_header        jReadHeader
841#define jpeg_start_decompress   jStrtDecompress
842#define jpeg_read_scanlines     jReadScanlines
843#define jpeg_finish_decompress  jFinDecompress
844#define jpeg_read_raw_data      jReadRawData
845#define jpeg_has_multiple_scans jHasMultScn
846#define jpeg_start_output       jStrtOutput
847#define jpeg_finish_output      jFinOutput
848#define jpeg_input_complete     jInComplete
849#define jpeg_new_colormap       jNewCMap
850#define jpeg_consume_input      jConsumeInput
851#define jpeg_calc_output_dimensions     jCalcDimensions
852#define jpeg_set_marker_processor       jSetMarker
853#define jpeg_read_coefficients  jReadCoefs
854#define jpeg_write_coefficients jWrtCoefs
855#define jpeg_copy_critical_parameters   jCopyCrit
856#define jpeg_abort_compress     jAbrtCompress
857#define jpeg_abort_decompress   jAbrtDecompress
858#define jpeg_abort              jAbort
859#define jpeg_destroy            jDestroy
860#define jpeg_resync_to_restart  jResyncRestart
861#endif /* NEED_SHORT_EXTERNAL_NAMES */
862
863
864/* Default error-management setup */
865EXTERN struct jpeg_error_mgr *jpeg_std_error JPP((struct jpeg_error_mgr *err));
866
867/* Initialization and destruction of JPEG compression objects */
868/* NB: you must set up the error-manager BEFORE calling jpeg_create_xxx */
869EXTERN void jpeg_create_compress JPP((j_compress_ptr cinfo));
870EXTERN void jpeg_create_decompress JPP((j_decompress_ptr cinfo));
871EXTERN void jpeg_destroy_compress JPP((j_compress_ptr cinfo));
872EXTERN void jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));
873
874/* Standard data source and destination managers: stdio streams. */
875/* Caller is responsible for opening the file before and closing after. */
876EXTERN void jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
877EXTERN void jpeg_mem_src JPP((j_decompress_ptr cinfo, unsigned char *buffer, size_t size));
878
879/* Default parameter setup for compression */
880EXTERN void jpeg_set_defaults JPP((j_compress_ptr cinfo));
881/* Compression parameter setup aids */
882EXTERN void jpeg_set_colorspace JPP((j_compress_ptr cinfo,
883                                     J_COLOR_SPACE colorspace));
884EXTERN void jpeg_default_colorspace JPP((j_compress_ptr cinfo));
885EXTERN void jpeg_set_quality JPP((j_compress_ptr cinfo, int quality,
886                                  boolean force_baseline));
887EXTERN void jpeg_set_linear_quality JPP((j_compress_ptr cinfo,
888                                         int scale_factor,
889                                         boolean force_baseline));
890EXTERN void jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl,
891                                      const unsigned int *basic_table,
892                                      int scale_factor,
893                                      boolean force_baseline));
894EXTERN int jpeg_quality_scaling JPP((int quality));
895EXTERN void jpeg_simple_progression JPP((j_compress_ptr cinfo));
896EXTERN void jpeg_suppress_tables JPP((j_compress_ptr cinfo,
897                                      boolean suppress));
898EXTERN JQUANT_TBL * jpeg_alloc_quant_table JPP((j_common_ptr cinfo));
899EXTERN JHUFF_TBL * jpeg_alloc_huff_table JPP((j_common_ptr cinfo));
900
901/* Main entry points for compression */
902EXTERN void jpeg_start_compress JPP((j_compress_ptr cinfo,
903                                     boolean write_all_tables));
904EXTERN JDIMENSION jpeg_write_scanlines JPP((j_compress_ptr cinfo,
905                                            JSAMPARRAY scanlines,
906                                            JDIMENSION num_lines));
907EXTERN void jpeg_finish_compress JPP((j_compress_ptr cinfo));
908
909/* Replaces jpeg_write_scanlines when writing raw downsampled data. */
910EXTERN JDIMENSION jpeg_write_raw_data JPP((j_compress_ptr cinfo,
911                                           JSAMPIMAGE data,
912                                           JDIMENSION num_lines));
913
914/* Write a special marker.  See libjpeg.doc concerning safe usage. */
915EXTERN void jpeg_write_marker JPP((j_compress_ptr cinfo, int marker,
916                                   const JOCTET *dataptr, unsigned int datalen));
917
918/* Alternate compression function: just write an abbreviated table file */
919EXTERN void jpeg_write_tables JPP((j_compress_ptr cinfo));
920
921/* Decompression startup: read start of JPEG datastream to see what's there */
922EXTERN int jpeg_read_header JPP((j_decompress_ptr cinfo,
923                                 boolean require_image));
924/* Return value is one of: */
925#define JPEG_SUSPENDED          0 /* Suspended due to lack of input data */
926#define JPEG_HEADER_OK          1 /* Found valid image datastream */
927#define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */
928/* If you pass require_image = TRUE (normal case), you need not check for
929 * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
930 * JPEG_SUSPENDED is only possible if you use a data source module that can
931 * give a suspension return (the stdio source module doesn't).
932 */
933
934/* Main entry points for decompression */
935EXTERN boolean jpeg_start_decompress JPP((j_decompress_ptr cinfo));
936EXTERN JDIMENSION jpeg_read_scanlines JPP((j_decompress_ptr cinfo,
937                                           JSAMPARRAY scanlines,
938                                           JDIMENSION max_lines));
939EXTERN boolean jpeg_finish_decompress JPP((j_decompress_ptr cinfo));
940
941/* Replaces jpeg_read_scanlines when reading raw downsampled data. */
942EXTERN JDIMENSION jpeg_read_raw_data JPP((j_decompress_ptr cinfo,
943                                          JSAMPIMAGE data,
944                                          JDIMENSION max_lines));
945
946/* Additional entry points for buffered-image mode. */
947EXTERN boolean jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo));
948EXTERN boolean jpeg_start_output JPP((j_decompress_ptr cinfo,
949                                      int scan_number));
950EXTERN boolean jpeg_finish_output JPP((j_decompress_ptr cinfo));
951EXTERN boolean jpeg_input_complete JPP((j_decompress_ptr cinfo));
952EXTERN void jpeg_new_colormap JPP((j_decompress_ptr cinfo));
953EXTERN int jpeg_consume_input JPP((j_decompress_ptr cinfo));
954/* Return value is one of: */
955/* #define JPEG_SUSPENDED       0    Suspended due to lack of input data */
956#define JPEG_REACHED_SOS        1 /* Reached start of new scan */
957#define JPEG_REACHED_EOI        2 /* Reached end of image */
958#define JPEG_ROW_COMPLETED      3 /* Completed one iMCU row */
959#define JPEG_SCAN_COMPLETED     4 /* Completed last iMCU row of a scan */
960
961/* Precalculate output dimensions for current decompression parameters. */
962EXTERN void jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
963
964/* Install a special processing method for COM or APPn markers. */
965EXTERN void jpeg_set_marker_processor JPP((j_decompress_ptr cinfo,
966                                           int marker_code,
967                                           jpeg_marker_parser_method routine));
968
969/* Read or write raw DCT coefficients --- useful for lossless transcoding. */
970EXTERN jvirt_barray_ptr * jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
971EXTERN void jpeg_write_coefficients JPP((j_compress_ptr cinfo,
972                                         jvirt_barray_ptr * coef_arrays));
973EXTERN void jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo,
974                                               j_compress_ptr dstinfo));
975
976/* If you choose to abort compression or decompression before completing
977 * jpeg_finish_(de)compress, then you need to clean up to release memory,
978 * temporary files, etc.  You can just call jpeg_destroy_(de)compress
979 * if you're done with the JPEG object, but if you want to clean it up and
980 * reuse it, call this:
981 */
982EXTERN void jpeg_abort_compress JPP((j_compress_ptr cinfo));
983EXTERN void jpeg_abort_decompress JPP((j_decompress_ptr cinfo));
984
985/* Generic versions of jpeg_abort and jpeg_destroy that work on either
986 * flavor of JPEG object.  These may be more convenient in some places.
987 */
988EXTERN void jpeg_abort JPP((j_common_ptr cinfo));
989EXTERN void jpeg_destroy JPP((j_common_ptr cinfo));
990
991/* Default restart-marker-resync procedure for use by data source modules */
992EXTERN boolean jpeg_resync_to_restart JPP((j_decompress_ptr cinfo,
993                                           int desired));
994
995
996/* These marker codes are exported since applications and data source modules
997 * are likely to want to use them.
998 */
999
1000#define JPEG_RST0       0xD0    /* RST0 marker code */
1001#define JPEG_EOI        0xD9    /* EOI marker code */
1002#define JPEG_APP0       0xE0    /* APP0 marker code */
1003#define JPEG_COM        0xFE    /* COM marker code */
1004
1005
1006/* If we have a brain-damaged compiler that emits warnings (or worse, errors)
1007 * for structure definitions that are never filled in, keep it quiet by
1008 * supplying dummy definitions for the various substructures.
1009 */
1010
1011#ifdef INCOMPLETE_TYPES_BROKEN
1012#ifndef JPEG_INTERNALS          /* will be defined in jpegint.h */
1013struct jvirt_sarray_control { long dummy; };
1014struct jvirt_barray_control { long dummy; };
1015struct jpeg_comp_master { long dummy; };
1016struct jpeg_c_main_controller { long dummy; };
1017struct jpeg_c_prep_controller { long dummy; };
1018struct jpeg_c_coef_controller { long dummy; };
1019struct jpeg_marker_writer { long dummy; };
1020struct jpeg_color_converter { long dummy; };
1021struct jpeg_downsampler { long dummy; };
1022struct jpeg_forward_dct { long dummy; };
1023struct jpeg_entropy_encoder { long dummy; };
1024struct jpeg_decomp_master { long dummy; };
1025struct jpeg_d_main_controller { long dummy; };
1026struct jpeg_d_coef_controller { long dummy; };
1027struct jpeg_d_post_controller { long dummy; };
1028struct jpeg_input_controller { long dummy; };
1029struct jpeg_marker_reader { long dummy; };
1030struct jpeg_entropy_decoder { long dummy; };
1031struct jpeg_inverse_dct { long dummy; };
1032struct jpeg_upsampler { long dummy; };
1033struct jpeg_color_deconverter { long dummy; };
1034struct jpeg_color_quantizer { long dummy; };
1035#endif /* JPEG_INTERNALS */
1036#endif /* INCOMPLETE_TYPES_BROKEN */
1037
1038
1039/*
1040 * The JPEG library modules define JPEG_INTERNALS before including this file.
1041 * The internal structure declarations are read only when that is true.
1042 * Applications using the library should not include jpegint.h, but may wish
1043 * to include jerror.h.
1044 */
1045
1046#ifdef JPEG_INTERNALS
1047#include "../jpeg-6/jpegint.h"          /* fetch private declarations */
1048#include "../jpeg-6/jerror.h"           /* fetch error codes too */
1049#endif
1050
1051#endif /* JPEGLIB_H */
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