OFFIS DCMTK  Version 3.6.0
jpeglib16.h
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 "jconfig16.h" /* widely used configuration options */
25 #endif
26 #include "jmorecfg16.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 data units
50  * per MCU.
51  * If you happen to run across such a file, you can up D_MAX_DATA_UNITS_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_DATA_UNITS_IN_MCU; just because Adobe
54  * sometimes emits noncompliant files doesn't mean you should too.
55  */
56 #define C_MAX_DATA_UNITS_IN_MCU 10 /* compressor's limit on data units/MCU */
57 #ifndef D_MAX_DATA_UNITS_IN_MCU
58 #define D_MAX_DATA_UNITS_IN_MCU 10 /* decompressor's limit on data units/MCU */
59 #endif
60 
61 
62 /* Data structures for images (arrays of samples and of DCT coefficients).
63  * On 80x86 machines, the image arrays are too big for near pointers,
64  * but the pointer arrays can fit in near memory.
65  */
66 
67 typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */
68 typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */
69 typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */
70 
71 typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */
72 typedef JBLOCK FAR *JBLOCKROW; /* pointer to one row of coefficient blocks */
73 typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */
74 typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */
75 
76 typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */
77 
78 typedef JDIFF FAR *JDIFFROW; /* pointer to one row of difference values */
79 typedef JDIFFROW *JDIFFARRAY; /* ptr to some rows (a 2-D diff array) */
80 typedef JDIFFARRAY *JDIFFIMAGE; /* a 3-D diff array: top index is color */
81 
82 
83 /* Types for JPEG compression parameters and working tables. */
84 
85 
86 /* DCT coefficient quantization tables. */
87 
88 typedef struct {
89  /* This array gives the coefficient quantizers in natural array order
90  * (not the zigzag order in which they are stored in a JPEG DQT marker).
91  * CAUTION: IJG versions prior to v6a kept this array in zigzag order.
92  */
93  UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */
94  /* This field is used only during compression. It's initialized FALSE when
95  * the table is created, and set TRUE when it's been output to the file.
96  * You could suppress output of a table by setting this to TRUE.
97  * (See jpeg_suppress_tables for an example.)
98  */
99  boolean sent_table; /* TRUE when table has been output */
100 } JQUANT_TBL;
101 
102 
103 /* Huffman coding tables. */
104 
105 typedef struct {
106  /* These two fields directly represent the contents of a JPEG DHT marker */
107  UINT8 bits[17]; /* bits[k] = # of symbols with codes of */
108  /* length k bits; bits[0] is unused */
109  UINT8 huffval[256]; /* The symbols, in order of incr code length */
110  /* This field is used only during compression. It's initialized FALSE when
111  * the table is created, and set TRUE when it's been output to the file.
112  * You could suppress output of a table by setting this to TRUE.
113  * (See jpeg_suppress_tables for an example.)
114  */
115  boolean sent_table; /* TRUE when table has been output */
116 } JHUFF_TBL;
117 
118 
119 /* Basic info about one component (color channel). */
120 
121 typedef struct {
122  /* These values are fixed over the whole image. */
123  /* For compression, they must be supplied by parameter setup; */
124  /* for decompression, they are read from the SOF marker. */
125  int component_id; /* identifier for this component (0..255) */
126  int component_index; /* its index in SOF or cinfo->comp_info[] */
127  int h_samp_factor; /* horizontal sampling factor (1..4) */
128  int v_samp_factor; /* vertical sampling factor (1..4) */
129  int quant_tbl_no; /* quantization table selector (0..3) */
130  /* These values may vary between scans. */
131  /* For compression, they must be supplied by parameter setup; */
132  /* for decompression, they are read from the SOS marker. */
133  /* The decompressor output side may not use these variables. */
134  int dc_tbl_no; /* DC entropy table selector (0..3) */
135  int ac_tbl_no; /* AC entropy table selector (0..3) */
136 
137  /* Remaining fields should be treated as private by applications. */
138 
139  /* These values are computed during compression or decompression startup: */
140  /* Component's size in data units.
141  * Any dummy data units added to complete an MCU are not counted; therefore
142  * these values do not depend on whether a scan is interleaved or not.
143  */
144  JDIMENSION width_in_data_units;
145  JDIMENSION height_in_data_units;
146  /* Size of a data unit in/output by the codec (in samples). Always
147  * data_unit for compression. For decompression this is the size of the
148  * output from one data_unit, reflecting any processing performed by the
149  * codec. For example, in the DCT-based codec, scaling may be applied
150  * during the IDCT step. Values of 1,2,4,8 are likely to be supported.
151  * Note that different components may have different codec_data_unit sizes.
152  */
153  int codec_data_unit;
154  /* The downsampled dimensions are the component's actual, unpadded number
155  * of samples at the main buffer (preprocessing/compression interface), thus
156  * downsampled_width = ceil(image_width * Hi/Hmax)
157  * and similarly for height. For decompression, codec-based processing is
158  * included (ie, IDCT scaling), so
159  * downsampled_width = ceil(image_width * Hi/Hmax * codec_data_unit/data_unit)
160  */
161  JDIMENSION downsampled_width; /* actual width in samples */
162  JDIMENSION downsampled_height; /* actual height in samples */
163  /* This flag is used only for decompression. In cases where some of the
164  * components will be ignored (eg grayscale output from YCbCr image),
165  * we can skip most computations for the unused components.
166  */
167  boolean component_needed; /* do we need the value of this component? */
168 
169  /* These values are computed before starting a scan of the component. */
170  /* The decompressor output side may not use these variables. */
171  int MCU_width; /* number of data units per MCU, horizontally */
172  int MCU_height; /* number of data units per MCU, vertically */
173  int MCU_data_units; /* MCU_width * MCU_height */
174  int MCU_sample_width; /* MCU width in samples, MCU_width*codec_data_unit */
175  int last_col_width; /* # of non-dummy data_units across in last MCU */
176  int last_row_height; /* # of non-dummy data_units down in last MCU */
177 
178  /* Saved quantization table for component; NULL if none yet saved.
179  * See jdinput.c comments about the need for this information.
180  * This field is currently used only for decompression.
181  */
182  JQUANT_TBL * quant_table;
183 
184  /* Private per-component storage for DCT or IDCT subsystem. */
185  void * dct_table;
187 
188 
189 /* The script for encoding a multiple-scan file is an array of these: */
190 
191 typedef struct {
192  int comps_in_scan; /* number of components encoded in this scan */
193  int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */
194  int Ss, Se; /* progressive JPEG spectral selection parms
195  lossless JPEG predictor select parm (Ss) */
196  int Ah, Al; /* progressive JPEG successive approx. parms
197  lossless JPEG point transform parm (Al) */
199 
200 /* The decompressor can save APPn and COM markers in a list of these: */
201 
202 typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr;
203 
204 struct jpeg_marker_struct {
205  jpeg_saved_marker_ptr next; /* next in list, or NULL */
206  UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */
207  unsigned int original_length; /* # bytes of data in the file */
208  unsigned int data_length; /* # bytes of data saved at data[] */
209  JOCTET FAR * data; /* the data contained in the marker */
210  /* the marker length word is not counted in data_length or original_length */
211 };
212 
213 /* Known codec processes. */
214 
215 typedef enum {
216  JPROC_SEQUENTIAL, /* baseline/extended sequential DCT */
217  JPROC_PROGRESSIVE, /* progressive DCT */
218  JPROC_LOSSLESS /* lossless (sequential) */
219 } J_CODEC_PROCESS;
220 
221 /* Known color spaces. */
222 
223 typedef enum {
224  JCS_UNKNOWN, /* error/unspecified */
225  JCS_GRAYSCALE, /* monochrome */
226  JCS_RGB, /* red/green/blue */
227  JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */
228  JCS_CMYK, /* C/M/Y/K */
229  JCS_YCCK /* Y/Cb/Cr/K */
230 } J_COLOR_SPACE;
231 
232 /* DCT/IDCT algorithm options. */
233 
234 typedef enum {
235  JDCT_ISLOW, /* slow but accurate integer algorithm */
236  JDCT_IFAST, /* faster, less accurate integer method */
237  JDCT_FLOAT /* floating-point: accurate, fast on fast HW */
238 } J_DCT_METHOD;
239 
240 #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */
241 #define JDCT_DEFAULT JDCT_ISLOW
242 #endif
243 #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */
244 #define JDCT_FASTEST JDCT_IFAST
245 #endif
246 
247 /* Dithering options for decompression. */
248 
249 typedef enum {
250  JDITHER_NONE, /* no dithering */
251  JDITHER_ORDERED, /* simple ordered dither */
252  JDITHER_FS /* Floyd-Steinberg error diffusion dither */
253 } J_DITHER_MODE;
254 
255 
256 /* Common fields between JPEG compression and decompression master structs. */
257 
258 #define jpeg_common_fields \
259  struct jpeg_error_mgr * err; /* Error handler module */\
260  struct jpeg_memory_mgr * mem; /* Memory manager module */\
261  struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\
262  void * client_data; /* Available for use by application */\
263  boolean is_decompressor; /* So common code can tell which is which */\
264  int global_state /* For checking call sequence validity */
265 
266 /* Routines that are to be used by both halves of the library are declared
267  * to receive a pointer to this structure. There are no actual instances of
268  * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
269  */
270 struct jpeg_common_struct {
271  jpeg_common_fields; /* Fields common to both master struct types */
272  /* Additional fields follow in an actual jpeg_compress_struct or
273  * jpeg_decompress_struct. All three structs must agree on these
274  * initial fields! (This would be a lot cleaner in C++.)
275  */
276 };
277 
278 typedef struct jpeg_common_struct * j_common_ptr;
279 typedef struct jpeg_compress_struct * j_compress_ptr;
281 
282 
283 /* Master record for a compression instance */
284 
285 struct jpeg_compress_struct {
286  jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */
287 
288  /* Destination for compressed data */
289  struct jpeg_destination_mgr * dest;
290 
291  /* Description of source image --- these fields must be filled in by
292  * outer application before starting compression. in_color_space must
293  * be correct before you can even call jpeg_set_defaults().
294  */
295 
296  JDIMENSION image_width; /* input image width */
297  JDIMENSION image_height; /* input image height */
298  int input_components; /* # of color components in input image */
299  J_COLOR_SPACE in_color_space; /* colorspace of input image */
300 
301  double input_gamma; /* image gamma of input image */
302 
303  /* Compression parameters --- these fields must be set before calling
304  * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to
305  * initialize everything to reasonable defaults, then changing anything
306  * the application specifically wants to change. That way you won't get
307  * burnt when new parameters are added. Also note that there are several
308  * helper routines to simplify changing parameters.
309  */
310 
311  boolean lossless; /* TRUE=lossless encoding, FALSE=lossy */
312 
313  int data_precision; /* bits of precision in image data */
314 
315  int num_components; /* # of color components in JPEG image */
316  J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
317 
318  jpeg_component_info * comp_info;
319  /* comp_info[i] describes component that appears i'th in SOF */
320 
321  JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
322  /* ptrs to coefficient quantization tables, or NULL if not defined */
323 
324  JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
325  JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
326  /* ptrs to Huffman coding tables, or NULL if not defined */
327 
328  UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
329  UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
330  UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
331 
332  int num_scans; /* # of entries in scan_info array */
333  const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */
334  /* The default value of scan_info is NULL, which causes a single-scan
335  * sequential JPEG file to be emitted. To create a multi-scan file,
336  * set num_scans and scan_info to point to an array of scan definitions.
337  */
338 
339  boolean raw_data_in; /* TRUE=caller supplies downsampled data */
340  boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
341  boolean optimize_coding; /* TRUE=optimize entropy encoding parms */
342  boolean CCIR601_sampling; /* TRUE=first samples are cosited */
343  int smoothing_factor; /* 1..100, or 0 for no input smoothing */
344  J_DCT_METHOD dct_method; /* DCT algorithm selector */
345 
346  /* The restart interval can be specified in absolute MCUs by setting
347  * restart_interval, or in MCU rows by setting restart_in_rows
348  * (in which case the correct restart_interval will be figured
349  * for each scan).
350  */
351  unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
352  int restart_in_rows; /* if > 0, MCU rows per restart interval */
353 
354  /* Parameters controlling emission of special markers. */
355 
356  boolean write_JFIF_header; /* should a JFIF marker be written? */
357  UINT8 JFIF_major_version; /* What to write for the JFIF version number */
358  UINT8 JFIF_minor_version;
359  /* These three values are not used by the JPEG code, merely copied */
360  /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */
361  /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */
362  /* ratio is defined by X_density/Y_density even when density_unit=0. */
363  UINT8 density_unit; /* JFIF code for pixel size units */
364  UINT16 X_density; /* Horizontal pixel density */
365  UINT16 Y_density; /* Vertical pixel density */
366  boolean write_Adobe_marker; /* should an Adobe marker be written? */
367 
368  /* State variable: index of next scanline to be written to
369  * jpeg_write_scanlines(). Application may use this to control its
370  * processing loop, e.g., "while (next_scanline < image_height)".
371  */
372 
373  JDIMENSION next_scanline; /* 0 .. image_height-1 */
374 
375  /* Remaining fields are known throughout compressor, but generally
376  * should not be touched by a surrounding application.
377  */
378 
379  /*
380  * These fields are computed during compression startup
381  */
382  int data_unit; /* size of data unit in samples */
383  J_CODEC_PROCESS process; /* encoding process of JPEG image */
384 
385  int max_h_samp_factor; /* largest h_samp_factor */
386  int max_v_samp_factor; /* largest v_samp_factor */
387 
388  JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to codec */
389  /* The codec receives data in units of MCU rows as defined for fully
390  * interleaved scans (whether the JPEG file is interleaved or not).
391  * There are v_samp_factor * data_unit sample rows of each component in an
392  * "iMCU" (interleaved MCU) row.
393  */
394 
395  /*
396  * These fields are valid during any one scan.
397  * They describe the components and MCUs actually appearing in the scan.
398  */
399  int comps_in_scan; /* # of JPEG components in this scan */
400  jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
401  /* *cur_comp_info[i] describes component that appears i'th in SOS */
402 
403  JDIMENSION MCUs_per_row; /* # of MCUs across the image */
404  JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
405 
406  int data_units_in_MCU; /* # of data units per MCU */
407  int MCU_membership[C_MAX_DATA_UNITS_IN_MCU];
408  /* MCU_membership[i] is index in cur_comp_info of component owning */
409  /* i'th block in an MCU */
410 
411  int Ss, Se, Ah, Al; /* progressive/lossless JPEG parameters for scan */
412 
413  /*
414  * Links to compression subobjects (methods and private variables of modules)
415  */
416  struct jpeg_comp_master * master;
417  struct jpeg_c_main_controller * main;
418  struct jpeg_c_prep_controller * prep;
419  struct jpeg_c_codec * codec;
420  struct jpeg_marker_writer * marker;
421  struct jpeg_color_converter * cconvert;
422  struct jpeg_downsampler * downsample;
423  jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */
424  int script_space_size;
425 };
426 
427 
428 /* Master record for a decompression instance */
429 
430 struct jpeg_decompress_struct {
431  jpeg_common_fields; /* Fields shared with jpeg_compress_struct */
432 
433  /* Source of compressed data */
434  struct jpeg_source_mgr * src;
435 
436  /* Basic description of image --- filled in by jpeg_read_header(). */
437  /* Application may inspect these values to decide how to process image. */
438 
439  JDIMENSION image_width; /* nominal image width (from SOF marker) */
440  JDIMENSION image_height; /* nominal image height */
441  int num_components; /* # of color components in JPEG image */
442  J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
443 
444  /* Decompression processing parameters --- these fields must be set before
445  * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes
446  * them to default values.
447  */
448 
449  J_COLOR_SPACE out_color_space; /* colorspace for output */
450 
451  unsigned int scale_num, scale_denom; /* fraction by which to scale image */
452 
453  double output_gamma; /* image gamma wanted in output */
454 
455  boolean buffered_image; /* TRUE=multiple output passes */
456  boolean raw_data_out; /* TRUE=downsampled data wanted */
457 
458  J_DCT_METHOD dct_method; /* IDCT algorithm selector */
459  boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */
460  boolean do_block_smoothing; /* TRUE=apply interblock smoothing */
461 
462  boolean quantize_colors; /* TRUE=colormapped output wanted */
463  /* the following are ignored if not quantize_colors: */
464  J_DITHER_MODE dither_mode; /* type of color dithering to use */
465  boolean two_pass_quantize; /* TRUE=use two-pass color quantization */
466  int desired_number_of_colors; /* max # colors to use in created colormap */
467  /* these are significant only in buffered-image mode: */
468  boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */
469  boolean enable_external_quant;/* enable future use of external colormap */
470  boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */
471 
472  /* Description of actual output image that will be returned to application.
473  * These fields are computed by jpeg_start_decompress().
474  * You can also use jpeg_calc_output_dimensions() to determine these values
475  * in advance of calling jpeg_start_decompress().
476  */
477 
478  JDIMENSION output_width; /* scaled image width */
479  JDIMENSION output_height; /* scaled image height */
480  int out_color_components; /* # of color components in out_color_space */
481  int output_components; /* # of color components returned */
482  /* output_components is 1 (a colormap index) when quantizing colors;
483  * otherwise it equals out_color_components.
484  */
485  int rec_outbuf_height; /* min recommended height of scanline buffer */
486  /* If the buffer passed to jpeg_read_scanlines() is less than this many rows
487  * high, space and time will be wasted due to unnecessary data copying.
488  * Usually rec_outbuf_height will be 1 or 2, at most 4.
489  */
490 
491  /* When quantizing colors, the output colormap is described by these fields.
492  * The application can supply a colormap by setting colormap non-NULL before
493  * calling jpeg_start_decompress; otherwise a colormap is created during
494  * jpeg_start_decompress or jpeg_start_output.
495  * The map has out_color_components rows and actual_number_of_colors columns.
496  */
497  int actual_number_of_colors; /* number of entries in use */
498  JSAMPARRAY colormap; /* The color map as a 2-D pixel array */
499 
500  /* State variables: these variables indicate the progress of decompression.
501  * The application may examine these but must not modify them.
502  */
503 
504  /* Row index of next scanline to be read from jpeg_read_scanlines().
505  * Application may use this to control its processing loop, e.g.,
506  * "while (output_scanline < output_height)".
507  */
508  JDIMENSION output_scanline; /* 0 .. output_height-1 */
509 
510  /* Current input scan number and number of iMCU rows completed in scan.
511  * These indicate the progress of the decompressor input side.
512  */
513  int input_scan_number; /* Number of SOS markers seen so far */
514  JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */
515 
516  /* The "output scan number" is the notional scan being displayed by the
517  * output side. The decompressor will not allow output scan/row number
518  * to get ahead of input scan/row, but it can fall arbitrarily far behind.
519  */
520  int output_scan_number; /* Nominal scan number being displayed */
521  JDIMENSION output_iMCU_row; /* Number of iMCU rows read */
522 
523  /* Current progression status. coef_bits[c][i] indicates the precision
524  * with which component c's DCT coefficient i (in zigzag order) is known.
525  * It is -1 when no data has yet been received, otherwise it is the point
526  * transform (shift) value for the most recent scan of the coefficient
527  * (thus, 0 at completion of the progression).
528  * This pointer is NULL when reading a non-progressive file.
529  */
530  int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */
531 
532  /* Internal JPEG parameters --- the application usually need not look at
533  * these fields. Note that the decompressor output side may not use
534  * any parameters that can change between scans.
535  */
536 
537  /* Quantization and Huffman tables are carried forward across input
538  * datastreams when processing abbreviated JPEG datastreams.
539  */
540 
541  JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
542  /* ptrs to coefficient quantization tables, or NULL if not defined */
543 
544  JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
545  JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
546  /* ptrs to Huffman coding tables, or NULL if not defined */
547 
548  /* These parameters are never carried across datastreams, since they
549  * are given in SOF/SOS markers or defined to be reset by SOI.
550  */
551 
552  int data_precision; /* bits of precision in image data */
553 
554  jpeg_component_info * comp_info;
555  /* comp_info[i] describes component that appears i'th in SOF */
556 
557  boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
558 
559  UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
560  UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
561  UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
562 
563  unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */
564 
565  /* These fields record data obtained from optional markers recognized by
566  * the JPEG library.
567  */
568  boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */
569  /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
570  UINT8 JFIF_major_version; /* JFIF version number */
571  UINT8 JFIF_minor_version;
572  UINT8 density_unit; /* JFIF code for pixel size units */
573  UINT16 X_density; /* Horizontal pixel density */
574  UINT16 Y_density; /* Vertical pixel density */
575  boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */
576  UINT8 Adobe_transform; /* Color transform code from Adobe marker */
577 
578  boolean CCIR601_sampling; /* TRUE=first samples are cosited */
579 
580  /* Aside from the specific data retained from APPn markers known to the
581  * library, the uninterpreted contents of any or all APPn and COM markers
582  * can be saved in a list for examination by the application.
583  */
584  jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */
585 
586  /* Remaining fields are known throughout decompressor, but generally
587  * should not be touched by a surrounding application.
588  */
589 
590  /*
591  * These fields are computed during decompression startup
592  */
593  int data_unit; /* size of data unit in samples */
594  J_CODEC_PROCESS process; /* decoding process of JPEG image */
595 
596  int max_h_samp_factor; /* largest h_samp_factor */
597  int max_v_samp_factor; /* largest v_samp_factor */
598 
599  int min_codec_data_unit; /* smallest codec_data_unit of any component */
600 
601  JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */
602  /* The codec's input and output progress is measured in units of "iMCU"
603  * (interleaved MCU) rows. These are the same as MCU rows in fully
604  * interleaved JPEG scans, but are used whether the scan is interleaved
605  * or not. We define an iMCU row as v_samp_factor data_unit rows of each
606  * component. Therefore, the codec output contains
607  * v_samp_factor*codec_data_unit sample rows of a component per iMCU row.
608  */
609 
610  JSAMPLE * sample_range_limit; /* table for fast range-limiting */
611 
612  /*
613  * These fields are valid during any one scan.
614  * They describe the components and MCUs actually appearing in the scan.
615  * Note that the decompressor output side must not use these fields.
616  */
617  int comps_in_scan; /* # of JPEG components in this scan */
618  jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
619  /* *cur_comp_info[i] describes component that appears i'th in SOS */
620 
621  JDIMENSION MCUs_per_row; /* # of MCUs across the image */
622  JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
623 
624  int data_units_in_MCU; /* # of data _units per MCU */
625  int MCU_membership[D_MAX_DATA_UNITS_IN_MCU];
626  /* MCU_membership[i] is index in cur_comp_info of component owning */
627  /* i'th data unit in an MCU */
628 
629  int Ss, Se, Ah, Al; /* progressive/lossless JPEG parms for scan */
630 
631  /* This field is shared between entropy decoder and marker parser.
632  * It is either zero or the code of a JPEG marker that has been
633  * read from the data source, but has not yet been processed.
634  */
635  int unread_marker;
636 
637  /*
638  * Links to decompression subobjects (methods, private variables of modules)
639  */
640  struct jpeg_decomp_master * master;
641  struct jpeg_d_main_controller * main;
642  struct jpeg_d_codec * codec;
643  struct jpeg_d_post_controller * post;
644  struct jpeg_input_controller * inputctl;
645  struct jpeg_marker_reader * marker;
646  struct jpeg_upsampler * upsample;
647  struct jpeg_color_deconverter * cconvert;
648  struct jpeg_color_quantizer * cquantize;
649 
650  /* Options that enable or disable various workarounds */
651  unsigned int workaround_options;
652 };
653 
654 /* constants for workaround_options in struct jpeg_decompress_struct */
655 #define WORKAROUND_PREDICTOR6OVERFLOW 1
656 
657 /* "Object" declarations for JPEG modules that may be supplied or called
658  * directly by the surrounding application.
659  * As with all objects in the JPEG library, these structs only define the
660  * publicly visible methods and state variables of a module. Additional
661  * private fields may exist after the public ones.
662  */
663 
664 
665 /* Error handler object */
666 
667 struct jpeg_error_mgr {
668  /* Error exit handler: does not return to caller */
669  JMETHOD(void, error_exit, (j_common_ptr cinfo));
670  /* Conditionally emit a trace or warning message */
671  JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
672  /* Routine that actually outputs a trace or error message */
673  JMETHOD(void, output_message, (j_common_ptr cinfo));
674  /* Format a message string for the most recent JPEG error or message */
675  JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer));
676 #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */
677  /* Reset error state variables at start of a new image */
678  JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));
679 
680  /* The message ID code and any parameters are saved here.
681  * A message can have one string parameter or up to 8 int parameters.
682  */
683  int msg_code;
684 #define JMSG_STR_PARM_MAX 80
685  union {
686  int i[8];
687  char s[JMSG_STR_PARM_MAX];
688  } msg_parm;
689 
690  /* Standard state variables for error facility */
691 
692  int trace_level; /* max msg_level that will be displayed */
693 
694  /* For recoverable corrupt-data errors, we emit a warning message,
695  * but keep going unless emit_message chooses to abort. emit_message
696  * should count warnings in num_warnings. The surrounding application
697  * can check for bad data by seeing if num_warnings is nonzero at the
698  * end of processing.
699  */
700  long num_warnings; /* number of corrupt-data warnings */
701 
702  /* These fields point to the table(s) of error message strings.
703  * An application can change the table pointer to switch to a different
704  * message list (typically, to change the language in which errors are
705  * reported). Some applications may wish to add additional error codes
706  * that will be handled by the JPEG library error mechanism; the second
707  * table pointer is used for this purpose.
708  *
709  * First table includes all errors generated by JPEG library itself.
710  * Error code 0 is reserved for a "no such error string" message.
711  */
712  const char * const * jpeg_message_table; /* Library errors */
713  int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */
714  /* Second table can be added by application (see cjpeg/djpeg for example).
715  * It contains strings numbered first_addon_message..last_addon_message.
716  */
717  const char * const * addon_message_table; /* Non-library errors */
718  int first_addon_message; /* code for first string in addon table */
719  int last_addon_message; /* code for last string in addon table */
720 };
721 
722 
723 /* Progress monitor object */
724 
725 struct jpeg_progress_mgr {
726  JMETHOD(void, progress_monitor, (j_common_ptr cinfo));
727 
728  long pass_counter; /* work units completed in this pass */
729  long pass_limit; /* total number of work units in this pass */
730  int completed_passes; /* passes completed so far */
731  int total_passes; /* total number of passes expected */
732 };
733 
734 
735 /* Data destination object for compression */
736 
737 struct jpeg_destination_mgr {
738  JOCTET * next_output_byte; /* => next byte to write in buffer */
739  size_t free_in_buffer; /* # of byte spaces remaining in buffer */
740 
741  JMETHOD(void, init_destination, (j_compress_ptr cinfo));
742  JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo));
743  JMETHOD(void, term_destination, (j_compress_ptr cinfo));
744 };
745 
746 
747 /* Data source object for decompression */
748 
749 struct jpeg_source_mgr {
750  const JOCTET * next_input_byte; /* => next byte to read from buffer */
751  size_t bytes_in_buffer; /* # of bytes remaining in buffer */
752 
753  JMETHOD(void, init_source, (j_decompress_ptr cinfo));
754  JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo));
755  JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes));
756  JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired));
757  JMETHOD(void, term_source, (j_decompress_ptr cinfo));
758 };
759 
760 
761 /* Memory manager object.
762  * Allocates "small" objects (a few K total), "large" objects (tens of K),
763  * and "really big" objects (virtual arrays with backing store if needed).
764  * The memory manager does not allow individual objects to be freed; rather,
765  * each created object is assigned to a pool, and whole pools can be freed
766  * at once. This is faster and more convenient than remembering exactly what
767  * to free, especially where malloc()/free() are not too speedy.
768  * NB: alloc routines never return NULL. They exit to error_exit if not
769  * successful.
770  */
771 
772 #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */
773 #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */
774 #define JPOOL_NUMPOOLS 2
775 
776 typedef struct jvirt_sarray_control * jvirt_sarray_ptr;
777 typedef struct jvirt_barray_control * jvirt_barray_ptr;
778 
779 
780 #ifdef C_LOSSLESS_SUPPORTED
781 #define NEED_DARRAY
782 #else
783 #ifdef D_LOSSLESS_SUPPORTED
784 #define NEED_DARRAY
785 #endif
786 #endif
787 
788 struct jpeg_memory_mgr {
789  /* Method pointers */
790  JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id,
791  size_t sizeofobject));
792  JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id,
793  size_t sizeofobject));
794  JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id,
795  JDIMENSION samplesperrow,
796  JDIMENSION numrows));
797  JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id,
798  JDIMENSION blocksperrow,
799  JDIMENSION numrows));
800 #ifdef NEED_DARRAY
801  JMETHOD(JDIFFARRAY, alloc_darray, (j_common_ptr cinfo, int pool_id,
802  JDIMENSION diffsperrow,
803  JDIMENSION numrows));
804 #endif
805  JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo,
806  int pool_id,
807  boolean pre_zero,
808  JDIMENSION samplesperrow,
809  JDIMENSION numrows,
810  JDIMENSION maxaccess));
811  JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo,
812  int pool_id,
813  boolean pre_zero,
814  JDIMENSION blocksperrow,
815  JDIMENSION numrows,
816  JDIMENSION maxaccess));
817  JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo));
818  JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo,
819  jvirt_sarray_ptr ptr,
820  JDIMENSION start_row,
821  JDIMENSION num_rows,
822  boolean writable));
823  JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo,
824  jvirt_barray_ptr ptr,
825  JDIMENSION start_row,
826  JDIMENSION num_rows,
827  boolean writable));
828  JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id));
829  JMETHOD(void, self_destruct, (j_common_ptr cinfo));
830 
831  /* Limit on memory allocation for this JPEG object. (Note that this is
832  * merely advisory, not a guaranteed maximum; it only affects the space
833  * used for virtual-array buffers.) May be changed by outer application
834  * after creating the JPEG object.
835  */
836  long max_memory_to_use;
837 
838  /* Maximum allocation request accepted by alloc_large. */
839  long max_alloc_chunk;
840 };
841 
842 
843 /* Routine signature for application-supplied marker processing methods.
844  * Need not pass marker code since it is stored in cinfo->unread_marker.
845  */
846 typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
847 
848 
849 /* Declarations for routines called by application.
850  * The JPP macro hides prototype parameters from compilers that can't cope.
851  * Note JPP requires double parentheses.
852  */
853 
854 #ifdef HAVE_PROTOTYPES
855 #define JPP(arglist) arglist
856 #else
857 #define JPP(arglist) ()
858 #endif
859 
860 
861 /* Short forms of external names for systems with brain-damaged linkers.
862  * We shorten external names to be unique in the first six letters, which
863  * is good enough for all known systems.
864  * (If your compiler itself needs names to be unique in less than 15
865  * characters, you are out of luck. Get a better compiler.)
866  */
867 
868 /* MAKE SURE THAT ALL FUNCTIONS DECLARED GLOBAL() ARE RE-DEFINED HERE! */
869 
870 #ifdef NEED_SHORT_EXTERNAL_NAMES
871 #define jcopy_block_row jcopy16_block_row
872 #define jcopy_sample_rows jcopy16_sample_rows
873 #define jdiv_round_up jdiv16_round_up
874 #define jinit_1pass_quantizer jinit16_1pass_quantizer
875 #define jinit_2pass_quantizer jinit16_2pass_quantizer
876 #define jinit_arith_decoder jinit16_arith_decoder
877 #define jinit_arith_encoder jinit16_arith_encoder
878 #define jinit_c_codec jinit16_c_codec
879 #define jinit_c_coef_controller jinit16_c_coef_controller
880 #define jinit_c_diff_controller jinit16_c_diff_controller
881 #define jinit_c_main_controller jinit16_c_main_controller
882 #define jinit_c_master_control jinit16_c_master_control
883 #define jinit_c_prep_controller jinit16_c_prep_controller
884 #define jinit_c_scaler jinit16_c_scaler
885 #define jinit_color_converter jinit16_color_converter
886 #define jinit_color_deconverter jinit16_color_deconverter
887 #define jinit_compress_master jinit16_compress_master
888 #define jinit_d_codec jinit16_d_codec
889 #define jinit_d_coef_controller jinit16_d_coef_controller
890 #define jinit_d_diff_controller jinit16_d_diff_controller
891 #define jinit_d_main_controller jinit16_d_main_controller
892 #define jinit_d_post_controller jinit16_d_post_controller
893 #define jinit_d_post_controller jinit16_d_post_controller
894 #define jinit_d_scaler jinit16_d_scaler
895 #define jinit_differencer jinit16_differencer
896 #define jinit_downsampler jinit16_downsampler
897 #define jinit_forward_dct jinit16_forward_dct
898 #define jinit_input_controller jinit16_input_controller
899 #define jinit_inverse_dct jinit16_inverse_dct
900 #define jinit_lhuff_decoder jinit16_lhuff_decoder
901 #define jinit_lhuff_encoder jinit16_lhuff_encoder
902 #define jinit_lossless_c_codec jinit16_lossless_c_codec
903 #define jinit_lossless_d_codec jinit16_lossless_d_codec
904 #define jinit_lossy_c_codec jinit16_lossy_c_codec
905 #define jinit_lossy_d_codec jinit16_lossy_d_codec
906 #define jinit_marker_reader jinit16_marker_reader
907 #define jinit_marker_writer jinit16_marker_writer
908 #define jinit_master_decompress jinit16_master_decompress
909 #define jinit_memory_mgr jinit16_memory_mgr
910 #define jinit_merged_upsampler jinit16_merged_upsampler
911 #define jinit_phuff_decoder jinit16_phuff_decoder
912 #define jinit_phuff_encoder jinit16_phuff_encoder
913 #define jinit_shuff_decoder jinit16_shuff_decoder
914 #define jinit_shuff_encoder jinit16_shuff_encoder
915 #define jinit_undifferencer jinit16_undifferencer
916 #define jinit_upsampler jinit16_upsampler
917 #define jpeg_CreateCompress jpeg16_CreateCompress
918 #define jpeg_CreateDecompress jpeg16_CreateDecompress
919 #define jpeg_abort jpeg16_abort
920 #define jpeg_abort_compress jpeg16_abort_compress
921 #define jpeg_abort_decompress jpeg16_abort_decompress
922 #define jpeg_add_quant_table jpeg16_add_quant_table
923 #define jpeg_alloc_huff_table jpeg16_alloc_huff_table
924 #define jpeg_alloc_quant_table jpeg16_alloc_quant_table
925 #define jpeg_calc_output_dimensions jpeg16_calc_output_dimensions
926 #define jpeg_consume_input jpeg16_consume_input
927 #define jpeg_copy_critical_parameters jpeg16_copy_critical_parameters
928 #define jpeg_default_colorspace jpeg16_default_colorspace
929 #define jpeg_destroy jpeg16_destroy
930 #define jpeg_destroy_compress jpeg16_destroy_compress
931 #define jpeg_destroy_decompress jpeg16_destroy_decompress
932 #define jpeg_fdct_float jpeg16_fdct_float
933 #define jpeg_fdct_ifast jpeg16_fdct_ifast
934 #define jpeg_fdct_islow jpeg16_fdct_islow
935 #define jpeg_fill_bit_buffer jpeg16_fill_bit_buffer
936 #define jpeg_finish_compress jpeg16_finish_compress
937 #define jpeg_finish_decompress jpeg16_finish_decompress
938 #define jpeg_finish_output jpeg16_finish_output
939 #define jpeg_free_large jpeg16_free_large
940 #define jpeg_free_small jpeg16_free_small
941 #define jpeg_gen_optimal_table jpeg16_gen_optimal_table
942 #define jpeg_get_large jpeg16_get_large
943 #define jpeg_get_small jpeg16_get_small
944 #define jpeg_has_multiple_scans jpeg16_has_multiple_scans
945 #define jpeg_huff_decode jpeg16_huff_decode
946 #define jpeg_idct_1x1 jpeg16_idct_1x1
947 #define jpeg_idct_2x2 jpeg16_idct_2x2
948 #define jpeg_idct_4x4 jpeg16_idct_4x4
949 #define jpeg_idct_float jpeg16_idct_float
950 #define jpeg_idct_ifast jpeg16_idct_ifast
951 #define jpeg_idct_islow jpeg16_idct_islow
952 #define jpeg_input_complete jpeg16_input_complete
953 #define jpeg_make_c_derived_tbl jpeg16_make_c_derived_tbl
954 #define jpeg_make_d_derived_tbl jpeg16_make_d_derived_tbl
955 #define jpeg_mem_available jpeg16_mem_available
956 #define jpeg_mem_init jpeg16_mem_init
957 #define jpeg_mem_term jpeg16_mem_term
958 #define jpeg_new_colormap jpeg16_new_colormap
959 #define jpeg_open_backing_store jpeg16_open_backing_store
960 #define jpeg_quality_scaling jpeg16_quality_scaling
961 #define jpeg_read_coefficients jpeg16_read_coefficients
962 #define jpeg_read_header jpeg16_read_header
963 #define jpeg_read_raw_data jpeg16_read_raw_data
964 #define jpeg_read_scanlines jpeg16_read_scanlines
965 #define jpeg_resync_to_restart jpeg16_resync_to_restart
966 #define jpeg_save_markers jpeg16_save_markers
967 #define jpeg_set_colorspace jpeg16_set_colorspace
968 #define jpeg_set_defaults jpeg16_set_defaults
969 #define jpeg_set_linear_quality jpeg16_set_linear_quality
970 #define jpeg_set_marker_processor jpeg16_set_marker_processor
971 #define jpeg_set_quality jpeg16_set_quality
972 #define jpeg_simple_lossless jpeg16_simple_lossless
973 #define jpeg_simple_progression jpeg16_simple_progression
974 #define jpeg_start_compress jpeg16_start_compress
975 #define jpeg_start_decompress jpeg16_start_decompress
976 #define jpeg_start_output jpeg16_start_output
977 #define jpeg_std_error jpeg16_std_error
978 #define jpeg_stdio_dest jpeg16_stdio_dest
979 #define jpeg_stdio_src jpeg16_stdio_src
980 #define jpeg_suppress_tables jpeg16_suppress_tables
981 #define jpeg_write_coefficients jpeg16_write_coefficients
982 #define jpeg_write_m_byte jpeg16_write_m_byte
983 #define jpeg_write_m_header jpeg16_write_m_header
984 #define jpeg_write_marker jpeg16_write_marker
985 #define jpeg_write_raw_data jpeg16_write_raw_data
986 #define jpeg_write_scanlines jpeg16_write_scanlines
987 #define jpeg_write_tables jpeg16_write_tables
988 #define jround_up jround16_up
989 #define jzero_far jzero16_far
990 #endif /* NEED_SHORT_EXTERNAL_NAMES */
991 
992 
993 /* Default error-management setup */
994 EXTERN(struct jpeg_error_mgr *) jpeg_std_error
995  JPP((struct jpeg_error_mgr * err));
996 
997 /* Initialization of JPEG compression objects.
998  * jpeg_create_compress() and jpeg_create_decompress() are the exported
999  * names that applications should call. These expand to calls on
1000  * jpeg_CreateCompress and jpeg_CreateDecompress with additional information
1001  * passed for version mismatch checking.
1002  * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
1003  */
1004 #define jpeg_create_compress(cinfo) \
1005  jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
1006  (size_t) sizeof(struct jpeg_compress_struct))
1007 #define jpeg_create_decompress(cinfo) \
1008  jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
1009  (size_t) sizeof(struct jpeg_decompress_struct))
1010 EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo,
1011  int version, size_t structsize));
1012 EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo,
1013  int version, size_t structsize));
1014 /* Destruction of JPEG compression objects */
1015 EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo));
1016 EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));
1017 
1018 /* Standard data source and destination managers: stdio streams. */
1019 /* Caller is responsible for opening the file before and closing after. */
1020 EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
1021 EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile));
1022 
1023 /* Default parameter setup for compression */
1024 EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo));
1025 /* Compression parameter setup aids */
1026 EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo,
1027  J_COLOR_SPACE colorspace));
1028 EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo));
1029 EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality,
1030  boolean force_baseline));
1031 EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo,
1032  int scale_factor,
1033  boolean force_baseline));
1034 EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl,
1035  const unsigned int *basic_table,
1036  int scale_factor,
1037  boolean force_baseline));
1038 EXTERN(int) jpeg_quality_scaling JPP((int quality));
1039 EXTERN(void) jpeg_simple_lossless JPP((j_compress_ptr cinfo,
1040  int predictor, int point_transform));
1041 EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo));
1042 EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo,
1043  boolean suppress));
1044 EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo));
1045 EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo));
1046 
1047 /* Main entry points for compression */
1048 EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo,
1049  boolean write_all_tables));
1050 EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo,
1051  JSAMPARRAY scanlines,
1052  JDIMENSION num_lines));
1053 EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo));
1054 
1055 /* Replaces jpeg_write_scanlines when writing raw downsampled data. */
1056 EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo,
1057  JSAMPIMAGE data,
1058  JDIMENSION num_lines));
1059 
1060 /* Write a special marker. See libjpeg.doc concerning safe usage. */
1061 EXTERN(void) jpeg_write_marker
1062  JPP((j_compress_ptr cinfo, int marker,
1063  const JOCTET * dataptr, unsigned int datalen));
1064 /* Same, but piecemeal. */
1065 EXTERN(void) jpeg_write_m_header
1066  JPP((j_compress_ptr cinfo, int marker, unsigned int datalen));
1067 EXTERN(void) jpeg_write_m_byte
1068  JPP((j_compress_ptr cinfo, int val));
1069 
1070 /* Alternate compression function: just write an abbreviated table file */
1071 EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo));
1072 
1073 /* Decompression startup: read start of JPEG datastream to see what's there */
1074 EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo,
1075  boolean require_image));
1076 /* Return value is one of: */
1077 #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */
1078 #define JPEG_HEADER_OK 1 /* Found valid image datastream */
1079 #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */
1080 /* If you pass require_image = TRUE (normal case), you need not check for
1081  * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
1082  * JPEG_SUSPENDED is only possible if you use a data source module that can
1083  * give a suspension return (the stdio source module doesn't).
1084  */
1085 
1086 /* Main entry points for decompression */
1087 EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo));
1088 EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo,
1089  JSAMPARRAY scanlines,
1090  JDIMENSION max_lines));
1091 EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo));
1092 
1093 /* Replaces jpeg_read_scanlines when reading raw downsampled data. */
1094 EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo,
1095  JSAMPIMAGE data,
1096  JDIMENSION max_lines));
1097 
1098 /* Additional entry points for buffered-image mode. */
1099 EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo));
1100 EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo,
1101  int scan_number));
1102 EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo));
1103 EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo));
1104 EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo));
1105 EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo));
1106 /* Return value is one of: */
1107 /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */
1108 #define JPEG_REACHED_SOS 1 /* Reached start of new scan */
1109 #define JPEG_REACHED_EOI 2 /* Reached end of image */
1110 #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */
1111 #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */
1112 
1113 /* Precalculate output dimensions for current decompression parameters. */
1114 EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
1115 
1116 /* Control saving of COM and APPn markers into marker_list. */
1117 EXTERN(void) jpeg_save_markers
1118  JPP((j_decompress_ptr cinfo, int marker_code,
1119  unsigned int length_limit));
1120 
1121 /* Install a special processing method for COM or APPn markers. */
1122 EXTERN(void) jpeg_set_marker_processor
1123  JPP((j_decompress_ptr cinfo, int marker_code,
1124  jpeg_marker_parser_method routine));
1125 
1126 /* Read or write raw DCT coefficients --- useful for lossless transcoding. */
1127 EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
1128 EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo,
1129  jvirt_barray_ptr * coef_arrays));
1130 EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo,
1131  j_compress_ptr dstinfo));
1132 
1133 /* If you choose to abort compression or decompression before completing
1134  * jpeg_finish_(de)compress, then you need to clean up to release memory,
1135  * temporary files, etc. You can just call jpeg_destroy_(de)compress
1136  * if you're done with the JPEG object, but if you want to clean it up and
1137  * reuse it, call this:
1138  */
1139 EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo));
1140 EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo));
1141 
1142 /* Generic versions of jpeg_abort and jpeg_destroy that work on either
1143  * flavor of JPEG object. These may be more convenient in some places.
1144  */
1145 EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo));
1146 EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo));
1147 
1148 /* Default restart-marker-resync procedure for use by data source modules */
1149 EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo,
1150  int desired));
1151 
1152 
1153 /* These marker codes are exported since applications and data source modules
1154  * are likely to want to use them.
1155  */
1156 
1157 #define JPEG_RST0 0xD0 /* RST0 marker code */
1158 #define JPEG_EOI 0xD9 /* EOI marker code */
1159 #define JPEG_APP0 0xE0 /* APP0 marker code */
1160 #define JPEG_COM 0xFE /* COM marker code */
1161 
1162 
1163 /* If we have a brain-damaged compiler that emits warnings (or worse, errors)
1164  * for structure definitions that are never filled in, keep it quiet by
1165  * supplying dummy definitions for the various substructures.
1166  */
1167 
1168 #ifdef INCOMPLETE_TYPES_BROKEN
1169 #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */
1170 struct jvirt_sarray_control { long dummy; };
1171 struct jvirt_barray_control { long dummy; };
1172 struct jpeg_comp_master { long dummy; };
1173 struct jpeg_c_main_controller { long dummy; };
1174 struct jpeg_c_prep_controller { long dummy; };
1175 struct jpeg_c_coef_controller { long dummy; };
1176 struct jpeg_marker_writer { long dummy; };
1177 struct jpeg_color_converter { long dummy; };
1178 struct jpeg_downsampler { long dummy; };
1179 struct jpeg_forward_dct { long dummy; };
1180 struct jpeg_entropy_encoder { long dummy; };
1181 struct jpeg_decomp_master { long dummy; };
1182 struct jpeg_d_main_controller { long dummy; };
1183 struct jpeg_d_coef_controller { long dummy; };
1184 struct jpeg_d_post_controller { long dummy; };
1185 struct jpeg_input_controller { long dummy; };
1186 struct jpeg_marker_reader { long dummy; };
1187 struct jpeg_entropy_decoder { long dummy; };
1188 struct jpeg_inverse_dct { long dummy; };
1189 struct jpeg_upsampler { long dummy; };
1190 struct jpeg_color_deconverter { long dummy; };
1191 struct jpeg_color_quantizer { long dummy; };
1192 #endif /* JPEG_INTERNALS */
1193 #endif /* INCOMPLETE_TYPES_BROKEN */
1194 
1195 
1196 /*
1197  * The JPEG library modules define JPEG_INTERNALS before including this file.
1198  * The internal structure declarations are read only when that is true.
1199  * Applications using the library should not include jpegint.h, but may wish
1200  * to include jerror.h.
1201  */
1202 
1203 #ifdef JPEG_INTERNALS
1204 #include "jpegint16.h" /* fetch private declarations */
1205 #include "jerror16.h" /* fetch error codes too */
1206 #endif
1207 
1208 #endif /* JPEGLIB_H */


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