jpeglib.h
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1 /*
2  * jpeglib.h
3  *
4  * Copyright (C) 1991-1998, Thomas G. Lane.
5  * This file is part of the Independent JPEG Group's software.
6  * For conditions of distribution and use, see the accompanying README file.
7  *
8  * This file defines the application interface for the JPEG library.
9  * Most applications using the library need only include this file,
10  * and perhaps jerror.h if they want to know the exact error codes.
11  */
12 
13 #ifndef JPEGLIB_H
14 #define JPEGLIB_H
15 
16 /*
17  * First we include the configuration files that record how this
18  * installation of the JPEG library is set up. jconfig.h can be
19  * generated automatically for many systems. jmorecfg.h contains
20  * manual configuration options that most people need not worry about.
21  */
22 
23 #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */
24 #include "jconfig.h" /* widely used configuration options */
25 #endif
26 #include "jmorecfg.h" /* seldom changed options */
27 
28 
29 /* Version ID for the JPEG library.
30  * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60".
31  */
32 
33 #define JPEG_LIB_VERSION 62 /* Version 6b */
34 
35 
36 /* Various constants determining the sizes of things.
37  * All of these are specified by the JPEG standard, so don't change them
38  * if you want to be compatible.
39  */
40 
41 #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */
42 #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */
43 #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */
44 #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */
45 #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */
46 #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */
47 #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */
48 /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
49  * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
50  * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
51  * to handle it. We even let you do this from the jconfig.h file. However,
52  * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
53  * sometimes emits noncompliant files doesn't mean you should too.
54  */
55 #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */
56 #ifndef D_MAX_BLOCKS_IN_MCU
57 #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */
58 #endif
59 
60 
61 /* Data structures for images (arrays of samples and of DCT coefficients).
62  * On 80x86 machines, the image arrays are too big for near pointers,
63  * but the pointer arrays can fit in near memory.
64  */
65 
66 typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */
67 typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */
68 typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */
69 
70 typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */
71 typedef JBLOCK FAR *JBLOCKROW; /* pointer to one row of coefficient blocks */
72 typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */
73 typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */
74 
75 typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */
76 
77 
78 /* Types for JPEG compression parameters and working tables. */
79 
80 
81 /* DCT coefficient quantization tables. */
82 
83 typedef struct {
84  /* This array gives the coefficient quantizers in natural array order
85  * (not the zigzag order in which they are stored in a JPEG DQT marker).
86  * CAUTION: IJG versions prior to v6a kept this array in zigzag order.
87  */
88  UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */
89  /* This field is used only during compression. It's initialized FALSE when
90  * the table is created, and set TRUE when it's been output to the file.
91  * You could suppress output of a table by setting this to TRUE.
92  * (See jpeg_suppress_tables for an example.)
93  */
94  boolean sent_table; /* TRUE when table has been output */
95 } JQUANT_TBL;
96 
97 
98 /* Huffman coding tables. */
99 
100 typedef struct {
101  /* These two fields directly represent the contents of a JPEG DHT marker */
102  UINT8 bits[17]; /* bits[k] = # of symbols with codes of */
103  /* length k bits; bits[0] is unused */
104  UINT8 huffval[256]; /* The symbols, in order of incr code length */
105  /* This field is used only during compression. It's initialized FALSE when
106  * the table is created, and set TRUE when it's been output to the file.
107  * You could suppress output of a table by setting this to TRUE.
108  * (See jpeg_suppress_tables for an example.)
109  */
110  boolean sent_table; /* TRUE when table has been output */
111 } JHUFF_TBL;
112 
113 
114 /* Basic info about one component (color channel). */
115 
116 typedef struct {
117  /* These values are fixed over the whole image. */
118  /* For compression, they must be supplied by parameter setup; */
119  /* for decompression, they are read from the SOF marker. */
120  int component_id; /* identifier for this component (0..255) */
121  int component_index; /* its index in SOF or cinfo->comp_info[] */
122  int h_samp_factor; /* horizontal sampling factor (1..4) */
123  int v_samp_factor; /* vertical sampling factor (1..4) */
124  int quant_tbl_no; /* quantization table selector (0..3) */
125  /* These values may vary between scans. */
126  /* For compression, they must be supplied by parameter setup; */
127  /* for decompression, they are read from the SOS marker. */
128  /* The decompressor output side may not use these variables. */
129  int dc_tbl_no; /* DC entropy table selector (0..3) */
130  int ac_tbl_no; /* AC entropy table selector (0..3) */
131 
132  /* Remaining fields should be treated as private by applications. */
133 
134  /* These values are computed during compression or decompression startup: */
135  /* Component's size in DCT blocks.
136  * Any dummy blocks added to complete an MCU are not counted; therefore
137  * these values do not depend on whether a scan is interleaved or not.
138  */
141  /* Size of a DCT block in samples. Always DCTSIZE for compression.
142  * For decompression this is the size of the output from one DCT block,
143  * reflecting any scaling we choose to apply during the IDCT step.
144  * Values of 1,2,4,8 are likely to be supported. Note that different
145  * components may receive different IDCT scalings.
146  */
148  /* The downsampled dimensions are the component's actual, unpadded number
149  * of samples at the main buffer (preprocessing/compression interface), thus
150  * downsampled_width = ceil(image_width * Hi/Hmax)
151  * and similarly for height. For decompression, IDCT scaling is included, so
152  * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE)
153  */
154  JDIMENSION downsampled_width; /* actual width in samples */
155  JDIMENSION downsampled_height; /* actual height in samples */
156  /* This flag is used only for decompression. In cases where some of the
157  * components will be ignored (eg grayscale output from YCbCr image),
158  * we can skip most computations for the unused components.
159  */
160  boolean component_needed; /* do we need the value of this component? */
161 
162  /* These values are computed before starting a scan of the component. */
163  /* The decompressor output side may not use these variables. */
164  int MCU_width; /* number of blocks per MCU, horizontally */
165  int MCU_height; /* number of blocks per MCU, vertically */
166  int MCU_blocks; /* MCU_width * MCU_height */
167  int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */
168  int last_col_width; /* # of non-dummy blocks across in last MCU */
169  int last_row_height; /* # of non-dummy blocks down in last MCU */
170 
171  /* Saved quantization table for component; NULL if none yet saved.
172  * See jdinput.c comments about the need for this information.
173  * This field is currently used only for decompression.
174  */
176 
177  /* Private per-component storage for DCT or IDCT subsystem. */
178  void * dct_table;
180 
181 
182 /* The script for encoding a multiple-scan file is an array of these: */
183 
184 typedef struct {
185  int comps_in_scan; /* number of components encoded in this scan */
186  int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */
187  int Ss, Se; /* progressive JPEG spectral selection parms */
188  int Ah, Al; /* progressive JPEG successive approx. parms */
190 
191 /* The decompressor can save APPn and COM markers in a list of these: */
192 
194 
196  jpeg_saved_marker_ptr next; /* next in list, or NULL */
197  UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */
198  unsigned int original_length; /* # bytes of data in the file */
199  unsigned int data_length; /* # bytes of data saved at data[] */
200  JOCTET FAR * data; /* the data contained in the marker */
201  /* the marker length word is not counted in data_length or original_length */
202 };
203 
204 /* Known color spaces. */
205 
206 typedef 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 
217 typedef 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 
232 typedef enum {
233  JDITHER_NONE, /* no dithering */
234  JDITHER_ORDERED, /* simple ordered dither */
235  JDITHER_FS /* Floyd-Steinberg error diffusion dither */
236 } J_DITHER_MODE;
237 
238 
239 /* Common fields between JPEG compression and decompression master structs. */
240 
241 #define jpeg_common_fields \
242  struct jpeg_error_mgr * err; /* Error handler module */\
243  struct jpeg_memory_mgr * mem; /* Memory manager module */\
244  struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\
245  void * client_data; /* Available for use by application */\
246  boolean is_decompressor; /* So common code can tell which is which */\
247  int global_state /* For checking call sequence validity */
248 
249 /* Routines that are to be used by both halves of the library are declared
250  * to receive a pointer to this structure. There are no actual instances of
251  * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
252  */
254  jpeg_common_fields; /* Fields common to both master struct types */
255  /* Additional fields follow in an actual jpeg_compress_struct or
256  * jpeg_decompress_struct. All three structs must agree on these
257  * initial fields! (This would be a lot cleaner in C++.)
258  */
259 };
260 
264 
265 
266 /* Master record for a compression instance */
267 
269  jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */
270 
271  /* Destination for compressed data */
273 
274  /* Description of source image --- these fields must be filled in by
275  * outer application before starting compression. in_color_space must
276  * be correct before you can even call jpeg_set_defaults().
277  */
278 
279  JDIMENSION image_width; /* input image width */
280  JDIMENSION image_height; /* input image height */
281  int input_components; /* # of color components in input image */
282  J_COLOR_SPACE in_color_space; /* colorspace of input image */
283 
284  double input_gamma; /* image gamma of input image */
285 
286  /* Compression parameters --- these fields must be set before calling
287  * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to
288  * initialize everything to reasonable defaults, then changing anything
289  * the application specifically wants to change. That way you won't get
290  * burnt when new parameters are added. Also note that there are several
291  * helper routines to simplify changing parameters.
292  */
293 
294  int data_precision; /* bits of precision in image data */
295 
296  int num_components; /* # of color components in JPEG image */
297  J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
298 
300  /* comp_info[i] describes component that appears i'th in SOF */
301 
303  /* ptrs to coefficient quantization tables, or NULL if not defined */
304 
307  /* ptrs to Huffman coding tables, or NULL if not defined */
308 
309  UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
310  UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
311  UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
312 
313  int num_scans; /* # of entries in scan_info array */
314  const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */
315  /* The default value of scan_info is NULL, which causes a single-scan
316  * sequential JPEG file to be emitted. To create a multi-scan file,
317  * set num_scans and scan_info to point to an array of scan definitions.
318  */
319 
320  boolean raw_data_in; /* TRUE=caller supplies downsampled data */
321  boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
322  boolean optimize_coding; /* TRUE=optimize entropy encoding parms */
323  boolean CCIR601_sampling; /* TRUE=first samples are cosited */
324  int smoothing_factor; /* 1..100, or 0 for no input smoothing */
325  J_DCT_METHOD dct_method; /* DCT algorithm selector */
326 
327  /* The restart interval can be specified in absolute MCUs by setting
328  * restart_interval, or in MCU rows by setting restart_in_rows
329  * (in which case the correct restart_interval will be figured
330  * for each scan).
331  */
332  unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
333  int restart_in_rows; /* if > 0, MCU rows per restart interval */
334 
335  /* Parameters controlling emission of special markers. */
336 
337  boolean write_JFIF_header; /* should a JFIF marker be written? */
338  UINT8 JFIF_major_version; /* What to write for the JFIF version number */
340  /* These three values are not used by the JPEG code, merely copied */
341  /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */
342  /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */
343  /* ratio is defined by X_density/Y_density even when density_unit=0. */
344  UINT8 density_unit; /* JFIF code for pixel size units */
345  UINT16 X_density; /* Horizontal pixel density */
346  UINT16 Y_density; /* Vertical pixel density */
347  boolean write_Adobe_marker; /* should an Adobe marker be written? */
348 
349  /* State variable: index of next scanline to be written to
350  * jpeg_write_scanlines(). Application may use this to control its
351  * processing loop, e.g., "while (next_scanline < image_height)".
352  */
353 
354  JDIMENSION next_scanline; /* 0 .. image_height-1 */
355 
356  /* Remaining fields are known throughout compressor, but generally
357  * should not be touched by a surrounding application.
358  */
359 
360  /*
361  * These fields are computed during compression startup
362  */
363  boolean progressive_mode; /* TRUE if scan script uses progressive mode */
364  int max_h_samp_factor; /* largest h_samp_factor */
365  int max_v_samp_factor; /* largest v_samp_factor */
366 
367  JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */
368  /* The coefficient controller receives data in units of MCU rows as defined
369  * for fully interleaved scans (whether the JPEG file is interleaved or not).
370  * There are v_samp_factor * DCTSIZE sample rows of each component in an
371  * "iMCU" (interleaved MCU) row.
372  */
373 
374  /*
375  * These fields are valid during any one scan.
376  * They describe the components and MCUs actually appearing in the scan.
377  */
378  int comps_in_scan; /* # of JPEG components in this scan */
380  /* *cur_comp_info[i] describes component that appears i'th in SOS */
381 
382  JDIMENSION MCUs_per_row; /* # of MCUs across the image */
383  JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
384 
385  int blocks_in_MCU; /* # of DCT blocks per MCU */
387  /* MCU_membership[i] is index in cur_comp_info of component owning */
388  /* i'th block in an MCU */
389 
390  int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
391 
392  /*
393  * Links to compression subobjects (methods and private variables of modules)
394  */
404  jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */
406 };
407 
408 
409 /* Master record for a decompression instance */
410 
412  jpeg_common_fields; /* Fields shared with jpeg_compress_struct */
413 
414  /* Source of compressed data */
416 
417  /* Basic description of image --- filled in by jpeg_read_header(). */
418  /* Application may inspect these values to decide how to process image. */
419 
420  JDIMENSION image_width; /* nominal image width (from SOF marker) */
421  JDIMENSION image_height; /* nominal image height */
422  int num_components; /* # of color components in JPEG image */
423  J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
424 
425  /* Decompression processing parameters --- these fields must be set before
426  * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes
427  * them to default values.
428  */
429 
430  J_COLOR_SPACE out_color_space; /* colorspace for output */
431 
432  unsigned int scale_num, scale_denom; /* fraction by which to scale image */
433 
434  double output_gamma; /* image gamma wanted in output */
435 
436  boolean buffered_image; /* TRUE=multiple output passes */
437  boolean raw_data_out; /* TRUE=downsampled data wanted */
438 
439  J_DCT_METHOD dct_method; /* IDCT algorithm selector */
440  boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */
441  boolean do_block_smoothing; /* TRUE=apply interblock smoothing */
442 
443  boolean quantize_colors; /* TRUE=colormapped output wanted */
444  /* the following are ignored if not quantize_colors: */
445  J_DITHER_MODE dither_mode; /* type of color dithering to use */
446  boolean two_pass_quantize; /* TRUE=use two-pass color quantization */
447  int desired_number_of_colors; /* max # colors to use in created colormap */
448  /* these are significant only in buffered-image mode: */
449  boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */
450  boolean enable_external_quant;/* enable future use of external colormap */
451  boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */
452 
453  /* Description of actual output image that will be returned to application.
454  * These fields are computed by jpeg_start_decompress().
455  * You can also use jpeg_calc_output_dimensions() to determine these values
456  * in advance of calling jpeg_start_decompress().
457  */
458 
459  JDIMENSION output_width; /* scaled image width */
460  JDIMENSION output_height; /* scaled image height */
461  int out_color_components; /* # of color components in out_color_space */
462  int output_components; /* # of color components returned */
463  /* output_components is 1 (a colormap index) when quantizing colors;
464  * otherwise it equals out_color_components.
465  */
466  int rec_outbuf_height; /* min recommended height of scanline buffer */
467  /* If the buffer passed to jpeg_read_scanlines() is less than this many rows
468  * high, space and time will be wasted due to unnecessary data copying.
469  * Usually rec_outbuf_height will be 1 or 2, at most 4.
470  */
471 
472  /* When quantizing colors, the output colormap is described by these fields.
473  * The application can supply a colormap by setting colormap non-NULL before
474  * calling jpeg_start_decompress; otherwise a colormap is created during
475  * jpeg_start_decompress or jpeg_start_output.
476  * The map has out_color_components rows and actual_number_of_colors columns.
477  */
478  int actual_number_of_colors; /* number of entries in use */
479  JSAMPARRAY colormap; /* The color map as a 2-D pixel array */
480 
481  /* State variables: these variables indicate the progress of decompression.
482  * The application may examine these but must not modify them.
483  */
484 
485  /* Row index of next scanline to be read from jpeg_read_scanlines().
486  * Application may use this to control its processing loop, e.g.,
487  * "while (output_scanline < output_height)".
488  */
489  JDIMENSION output_scanline; /* 0 .. output_height-1 */
490 
491  /* Current input scan number and number of iMCU rows completed in scan.
492  * These indicate the progress of the decompressor input side.
493  */
494  int input_scan_number; /* Number of SOS markers seen so far */
495  JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */
496 
497  /* The "output scan number" is the notional scan being displayed by the
498  * output side. The decompressor will not allow output scan/row number
499  * to get ahead of input scan/row, but it can fall arbitrarily far behind.
500  */
501  int output_scan_number; /* Nominal scan number being displayed */
502  JDIMENSION output_iMCU_row; /* Number of iMCU rows read */
503 
504  /* Current progression status. coef_bits[c][i] indicates the precision
505  * with which component c's DCT coefficient i (in zigzag order) is known.
506  * It is -1 when no data has yet been received, otherwise it is the point
507  * transform (shift) value for the most recent scan of the coefficient
508  * (thus, 0 at completion of the progression).
509  * This pointer is NULL when reading a non-progressive file.
510  */
511  int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */
512 
513  /* Internal JPEG parameters --- the application usually need not look at
514  * these fields. Note that the decompressor output side may not use
515  * any parameters that can change between scans.
516  */
517 
518  /* Quantization and Huffman tables are carried forward across input
519  * datastreams when processing abbreviated JPEG datastreams.
520  */
521 
523  /* ptrs to coefficient quantization tables, or NULL if not defined */
524 
527  /* ptrs to Huffman coding tables, or NULL if not defined */
528 
529  /* These parameters are never carried across datastreams, since they
530  * are given in SOF/SOS markers or defined to be reset by SOI.
531  */
532 
533  int data_precision; /* bits of precision in image data */
534 
536  /* comp_info[i] describes component that appears i'th in SOF */
537 
538  boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */
539  boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
540 
541  UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
542  UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
543  UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
544 
545  unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */
546 
547  /* These fields record data obtained from optional markers recognized by
548  * the JPEG library.
549  */
550  boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */
551  /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
552  UINT8 JFIF_major_version; /* JFIF version number */
554  UINT8 density_unit; /* JFIF code for pixel size units */
555  UINT16 X_density; /* Horizontal pixel density */
556  UINT16 Y_density; /* Vertical pixel density */
557  boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */
558  UINT8 Adobe_transform; /* Color transform code from Adobe marker */
559 
560  boolean CCIR601_sampling; /* TRUE=first samples are cosited */
561 
562  /* Aside from the specific data retained from APPn markers known to the
563  * library, the uninterpreted contents of any or all APPn and COM markers
564  * can be saved in a list for examination by the application.
565  */
566  jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */
567 
568  /* Remaining fields are known throughout decompressor, but generally
569  * should not be touched by a surrounding application.
570  */
571 
572  /*
573  * These fields are computed during decompression startup
574  */
575  int max_h_samp_factor; /* largest h_samp_factor */
576  int max_v_samp_factor; /* largest v_samp_factor */
577 
578  int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */
579 
580  JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */
581  /* The coefficient controller's input and output progress is measured in
582  * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows
583  * in fully interleaved JPEG scans, but are used whether the scan is
584  * interleaved or not. We define an iMCU row as v_samp_factor DCT block
585  * rows of each component. Therefore, the IDCT output contains
586  * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row.
587  */
588 
589  JSAMPLE * sample_range_limit; /* table for fast range-limiting */
590 
591  /*
592  * These fields are valid during any one scan.
593  * They describe the components and MCUs actually appearing in the scan.
594  * Note that the decompressor output side must not use these fields.
595  */
596  int comps_in_scan; /* # of JPEG components in this scan */
598  /* *cur_comp_info[i] describes component that appears i'th in SOS */
599 
600  JDIMENSION MCUs_per_row; /* # of MCUs across the image */
601  JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
602 
603  int blocks_in_MCU; /* # of DCT blocks per MCU */
605  /* MCU_membership[i] is index in cur_comp_info of component owning */
606  /* i'th block in an MCU */
607 
608  int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
609 
610  /* This field is shared between entropy decoder and marker parser.
611  * It is either zero or the code of a JPEG marker that has been
612  * read from the data source, but has not yet been processed.
613  */
615 
616  /*
617  * Links to decompression subobjects (methods, private variables of modules)
618  */
630 };
631 
632 
633 /* "Object" declarations for JPEG modules that may be supplied or called
634  * directly by the surrounding application.
635  * As with all objects in the JPEG library, these structs only define the
636  * publicly visible methods and state variables of a module. Additional
637  * private fields may exist after the public ones.
638  */
639 
640 
641 /* Error handler object */
642 
644  /* Error exit handler: does not return to caller */
645  JMETHOD(void, error_exit, (j_common_ptr cinfo));
646  /* Conditionally emit a trace or warning message */
647  JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
648  /* Routine that actually outputs a trace or error message */
649  JMETHOD(void, output_message, (j_common_ptr cinfo));
650  /* Format a message string for the most recent JPEG error or message */
651  JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer));
652 #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */
653  /* Reset error state variables at start of a new image */
654  JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));
655 
656  /* The message ID code and any parameters are saved here.
657  * A message can have one string parameter or up to 8 int parameters.
658  */
659  int msg_code;
660 #define JMSG_STR_PARM_MAX 80
661  union {
662  int i[8];
664  } msg_parm;
665 
666  /* Standard state variables for error facility */
667 
668  int trace_level; /* max msg_level that will be displayed */
669 
670  /* For recoverable corrupt-data errors, we emit a warning message,
671  * but keep going unless emit_message chooses to abort. emit_message
672  * should count warnings in num_warnings. The surrounding application
673  * can check for bad data by seeing if num_warnings is nonzero at the
674  * end of processing.
675  */
676  long num_warnings; /* number of corrupt-data warnings */
677 
678  /* These fields point to the table(s) of error message strings.
679  * An application can change the table pointer to switch to a different
680  * message list (typically, to change the language in which errors are
681  * reported). Some applications may wish to add additional error codes
682  * that will be handled by the JPEG library error mechanism; the second
683  * table pointer is used for this purpose.
684  *
685  * First table includes all errors generated by JPEG library itself.
686  * Error code 0 is reserved for a "no such error string" message.
687  */
688  const char * const * jpeg_message_table; /* Library errors */
689  int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */
690  /* Second table can be added by application (see cjpeg/djpeg for example).
691  * It contains strings numbered first_addon_message..last_addon_message.
692  */
693  const char * const * addon_message_table; /* Non-library errors */
694  int first_addon_message; /* code for first string in addon table */
695  int last_addon_message; /* code for last string in addon table */
696 };
697 
698 
699 /* Progress monitor object */
700 
702  JMETHOD(void, progress_monitor, (j_common_ptr cinfo));
703 
704  long pass_counter; /* work units completed in this pass */
705  long pass_limit; /* total number of work units in this pass */
706  int completed_passes; /* passes completed so far */
707  int total_passes; /* total number of passes expected */
708 };
709 
710 
711 /* Data destination object for compression */
712 
714  JOCTET * next_output_byte; /* => next byte to write in buffer */
715  size_t free_in_buffer; /* # of byte spaces remaining in buffer */
716 
717  JMETHOD(void, init_destination, (j_compress_ptr cinfo));
718  JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo));
719  JMETHOD(void, term_destination, (j_compress_ptr cinfo));
720 };
721 
722 
723 /* Data source object for decompression */
724 
726  const JOCTET * next_input_byte; /* => next byte to read from buffer */
727  size_t bytes_in_buffer; /* # of bytes remaining in buffer */
728 
729  JMETHOD(void, init_source, (j_decompress_ptr cinfo));
730  JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo));
731  JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes));
732  JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired));
733  JMETHOD(void, term_source, (j_decompress_ptr cinfo));
734 };
735 
736 
737 /* Memory manager object.
738  * Allocates "small" objects (a few K total), "large" objects (tens of K),
739  * and "really big" objects (virtual arrays with backing store if needed).
740  * The memory manager does not allow individual objects to be freed; rather,
741  * each created object is assigned to a pool, and whole pools can be freed
742  * at once. This is faster and more convenient than remembering exactly what
743  * to free, especially where malloc()/free() are not too speedy.
744  * NB: alloc routines never return NULL. They exit to error_exit if not
745  * successful.
746  */
747 
748 #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */
749 #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */
750 #define JPOOL_NUMPOOLS 2
751 
754 
755 
757  /* Method pointers */
758  JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id,
759  size_t sizeofobject));
760  JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id,
761  size_t sizeofobject));
762  JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id,
763  JDIMENSION samplesperrow,
764  JDIMENSION numrows));
765  JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id,
766  JDIMENSION blocksperrow,
767  JDIMENSION numrows));
769  int pool_id,
770  boolean pre_zero,
771  JDIMENSION samplesperrow,
772  JDIMENSION numrows,
773  JDIMENSION maxaccess));
775  int pool_id,
776  boolean pre_zero,
777  JDIMENSION blocksperrow,
778  JDIMENSION numrows,
779  JDIMENSION maxaccess));
780  JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo));
783  JDIMENSION start_row,
785  boolean writable));
788  JDIMENSION start_row,
790  boolean writable));
791  JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id));
792  JMETHOD(void, self_destruct, (j_common_ptr cinfo));
793 
794  /* Limit on memory allocation for this JPEG object. (Note that this is
795  * merely advisory, not a guaranteed maximum; it only affects the space
796  * used for virtual-array buffers.) May be changed by outer application
797  * after creating the JPEG object.
798  */
800 
801  /* Maximum allocation request accepted by alloc_large. */
803 };
804 
805 
806 /* Routine signature for application-supplied marker processing methods.
807  * Need not pass marker code since it is stored in cinfo->unread_marker.
808  */
809 typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));
810 
811 
812 /* Declarations for routines called by application.
813  * The JPP macro hides prototype parameters from compilers that can't cope.
814  * Note JPP requires double parentheses.
815  */
816 
817 #ifdef HAVE_PROTOTYPES
818 #define JPP(arglist) arglist
819 #else
820 #define JPP(arglist) ()
821 #endif
822 
823 
824 /* Short forms of external names for systems with brain-damaged linkers.
825  * We shorten external names to be unique in the first six letters, which
826  * is good enough for all known systems.
827  * (If your compiler itself needs names to be unique in less than 15
828  * characters, you are out of luck. Get a better compiler.)
829  */
830 
831 #ifdef NEED_SHORT_EXTERNAL_NAMES
832 #define jpeg_std_error jStdError
833 #define jpeg_CreateCompress jCreaCompress
834 #define jpeg_CreateDecompress jCreaDecompress
835 #define jpeg_destroy_compress jDestCompress
836 #define jpeg_destroy_decompress jDestDecompress
837 #define jpeg_stdio_dest jStdDest
838 #define jpeg_stdio_src jStdSrc
839 #define jpeg_set_defaults jSetDefaults
840 #define jpeg_set_colorspace jSetColorspace
841 #define jpeg_default_colorspace jDefColorspace
842 #define jpeg_set_quality jSetQuality
843 #define jpeg_set_linear_quality jSetLQuality
844 #define jpeg_add_quant_table jAddQuantTable
845 #define jpeg_quality_scaling jQualityScaling
846 #define jpeg_simple_progression jSimProgress
847 #define jpeg_suppress_tables jSuppressTables
848 #define jpeg_alloc_quant_table jAlcQTable
849 #define jpeg_alloc_huff_table jAlcHTable
850 #define jpeg_start_compress jStrtCompress
851 #define jpeg_write_scanlines jWrtScanlines
852 #define jpeg_finish_compress jFinCompress
853 #define jpeg_write_raw_data jWrtRawData
854 #define jpeg_write_marker jWrtMarker
855 #define jpeg_write_m_header jWrtMHeader
856 #define jpeg_write_m_byte jWrtMByte
857 #define jpeg_write_tables jWrtTables
858 #define jpeg_read_header jReadHeader
859 #define jpeg_start_decompress jStrtDecompress
860 #define jpeg_read_scanlines jReadScanlines
861 #define jpeg_finish_decompress jFinDecompress
862 #define jpeg_read_raw_data jReadRawData
863 #define jpeg_has_multiple_scans jHasMultScn
864 #define jpeg_start_output jStrtOutput
865 #define jpeg_finish_output jFinOutput
866 #define jpeg_input_complete jInComplete
867 #define jpeg_new_colormap jNewCMap
868 #define jpeg_consume_input jConsumeInput
869 #define jpeg_calc_output_dimensions jCalcDimensions
870 #define jpeg_save_markers jSaveMarkers
871 #define jpeg_set_marker_processor jSetMarker
872 #define jpeg_read_coefficients jReadCoefs
873 #define jpeg_write_coefficients jWrtCoefs
874 #define jpeg_copy_critical_parameters jCopyCrit
875 #define jpeg_abort_compress jAbrtCompress
876 #define jpeg_abort_decompress jAbrtDecompress
877 #define jpeg_abort jAbort
878 #define jpeg_destroy jDestroy
879 #define jpeg_resync_to_restart jResyncRestart
880 #endif /* NEED_SHORT_EXTERNAL_NAMES */
881 
882 
883 /* Default error-management setup */
885  JPP((struct jpeg_error_mgr * err));
886 
887 /* Initialization of JPEG compression objects.
888  * jpeg_create_compress() and jpeg_create_decompress() are the exported
889  * names that applications should call. These expand to calls on
890  * jpeg_CreateCompress and jpeg_CreateDecompress with additional information
891  * passed for version mismatch checking.
892  * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
893  */
894 #define jpeg_create_compress(cinfo) \
895  jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
896  (size_t) sizeof(struct jpeg_compress_struct))
897 #define jpeg_create_decompress(cinfo) \
898  jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
899  (size_t) sizeof(struct jpeg_decompress_struct))
901  int version, size_t structsize));
903  int version, size_t structsize));
904 /* Destruction of JPEG compression objects */
907 
908 /* Standard data source and destination managers: stdio streams. */
909 /* Caller is responsible for opening the file before and closing after. */
912 
913 /* Default parameter setup for compression */
915 /* Compression parameter setup aids */
920  boolean force_baseline));
923  boolean force_baseline));
925  const unsigned int *basic_table,
926  int scale_factor,
927  boolean force_baseline));
931  boolean suppress));
934 
935 /* Main entry points for compression */
937  boolean write_all_tables));
942 
943 /* Replaces jpeg_write_scanlines when writing raw downsampled data. */
947 
948 /* Write a special marker. See libjpeg.doc concerning safe usage. */
950  JPP((j_compress_ptr cinfo, int marker,
951  const JOCTET * dataptr, unsigned int datalen));
952 /* Same, but piecemeal. */
954  JPP((j_compress_ptr cinfo, int marker, unsigned int datalen));
956  JPP((j_compress_ptr cinfo, int val));
957 
958 /* Alternate compression function: just write an abbreviated table file */
960 
961 /* Decompression startup: read start of JPEG datastream to see what's there */
963  boolean require_image));
964 /* Return value is one of: */
965 #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */
966 #define JPEG_HEADER_OK 1 /* Found valid image datastream */
967 #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */
968 /* If you pass require_image = TRUE (normal case), you need not check for
969  * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
970  * JPEG_SUSPENDED is only possible if you use a data source module that can
971  * give a suspension return (the stdio source module doesn't).
972  */
973 
974 /* Main entry points for decompression */
975 EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo));
980 
981 /* Replaces jpeg_read_scanlines when reading raw downsampled data. */
985 
986 /* Additional entry points for buffered-image mode. */
989  int scan_number));
994 /* Return value is one of: */
995 /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */
996 #define JPEG_REACHED_SOS 1 /* Reached start of new scan */
997 #define JPEG_REACHED_EOI 2 /* Reached end of image */
998 #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */
999 #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */
1000 
1001 /* Precalculate output dimensions for current decompression parameters. */
1003 
1004 /* Control saving of COM and APPn markers into marker_list. */
1007  unsigned int length_limit));
1008 
1009 /* Install a special processing method for COM or APPn markers. */
1011  JPP((j_decompress_ptr cinfo, int marker_code,
1012  jpeg_marker_parser_method routine));
1013 
1014 /* Read or write raw DCT coefficients --- useful for lossless transcoding. */
1015 EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
1016 EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo,
1020 
1021 /* If you choose to abort compression or decompression before completing
1022  * jpeg_finish_(de)compress, then you need to clean up to release memory,
1023  * temporary files, etc. You can just call jpeg_destroy_(de)compress
1024  * if you're done with the JPEG object, but if you want to clean it up and
1025  * reuse it, call this:
1026  */
1029 
1030 /* Generic versions of jpeg_abort and jpeg_destroy that work on either
1031  * flavor of JPEG object. These may be more convenient in some places.
1032  */
1033 EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo));
1034 EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo));
1035 
1036 /* Default restart-marker-resync procedure for use by data source modules */
1038  int desired));
1039 
1040 
1041 /* These marker codes are exported since applications and data source modules
1042  * are likely to want to use them.
1043  */
1044 
1045 #define JPEG_RST0 0xD0 /* RST0 marker code */
1046 #define JPEG_EOI 0xD9 /* EOI marker code */
1047 #define JPEG_APP0 0xE0 /* APP0 marker code */
1048 #define JPEG_COM 0xFE /* COM marker code */
1049 
1050 
1051 /* If we have a brain-damaged compiler that emits warnings (or worse, errors)
1052  * for structure definitions that are never filled in, keep it quiet by
1053  * supplying dummy definitions for the various substructures.
1054  */
1055 
1056 #ifdef INCOMPLETE_TYPES_BROKEN
1057 #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */
1058 struct jvirt_sarray_control { long dummy; };
1059 struct jvirt_barray_control { long dummy; };
1060 struct jpeg_comp_master { long dummy; };
1061 struct jpeg_c_main_controller { long dummy; };
1062 struct jpeg_c_prep_controller { long dummy; };
1063 struct jpeg_c_coef_controller { long dummy; };
1064 struct jpeg_marker_writer { long dummy; };
1065 struct jpeg_color_converter { long dummy; };
1066 struct jpeg_downsampler { long dummy; };
1067 struct jpeg_forward_dct { long dummy; };
1068 struct jpeg_entropy_encoder { long dummy; };
1069 struct jpeg_decomp_master { long dummy; };
1070 struct jpeg_d_main_controller { long dummy; };
1071 struct jpeg_d_coef_controller { long dummy; };
1072 struct jpeg_d_post_controller { long dummy; };
1073 struct jpeg_input_controller { long dummy; };
1074 struct jpeg_marker_reader { long dummy; };
1075 struct jpeg_entropy_decoder { long dummy; };
1076 struct jpeg_inverse_dct { long dummy; };
1077 struct jpeg_upsampler { long dummy; };
1078 struct jpeg_color_deconverter { long dummy; };
1079 struct jpeg_color_quantizer { long dummy; };
1080 #endif /* JPEG_INTERNALS */
1081 #endif /* INCOMPLETE_TYPES_BROKEN */
1082 
1083 
1084 /*
1085  * The JPEG library modules define JPEG_INTERNALS before including this file.
1086  * The internal structure declarations are read only when that is true.
1087  * Applications using the library should not include jpegint.h, but may wish
1088  * to include jerror.h.
1089  */
1090 
1091 #ifdef JPEG_INTERNALS
1092 #include "jpegint.h" /* fetch private declarations */
1093 #include "jerror.h" /* fetch error codes too */
1094 #endif
1095 
1096 #endif /* JPEGLIB_H */
MAX_COMPS_IN_SCAN
#define MAX_COMPS_IN_SCAN
Definition: jpeglib.h:46
jpeg_component_info::MCU_height
int MCU_height
Definition: jpeglib.h:165
JDCT_ISLOW
@ JDCT_ISLOW
Definition: jpeglib.h:218
init_source
init_source(j_decompress_ptr cinfo)
Definition: jdatasrc.c:44
access_virt_barray
access_virt_barray(j_common_ptr cinfo, jvirt_barray_ptr ptr, JDIMENSION start_row, JDIMENSION num_rows, boolean writable)
Definition: jmemmgr.c:841
request_virt_sarray
request_virt_sarray(j_common_ptr cinfo, int pool_id, boolean pre_zero, JDIMENSION samplesperrow, JDIMENSION numrows, JDIMENSION maxaccess)
Definition: jmemmgr.c:523
jpeg_destroy
jpeg_destroy(j_common_ptr cinfo)
Definition: jcomapi.c:69
jpeg_compress_struct::JFIF_major_version
UINT8 JFIF_major_version
Definition: jpeglib.h:338
dataptr
int const JOCTET * dataptr
Definition: jpeglib.h:951
jpeg_error_mgr::s
char s[JMSG_STR_PARM_MAX]
Definition: jpeglib.h:663
jpeg_input_controller
Definition: jpegint.h:146
JDCT_FLOAT
@ JDCT_FLOAT
Definition: jpeglib.h:220
NUM_HUFF_TBLS
#define NUM_HUFF_TBLS
Definition: jpeglib.h:44
jpeg_decompress_struct::dc_huff_tbl_ptrs
JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]
Definition: jpeglib.h:525
jpeg_compress_struct::raw_data_in
boolean raw_data_in
Definition: jpeglib.h:320
jpeg_common_struct::jpeg_common_fields
jpeg_common_fields
Definition: jpeglib.h:254
alloc_small
alloc_small(j_common_ptr cinfo, int pool_id, size_t sizeofobject)
Definition: jmemmgr.c:257
jpeg_compress_struct::fdct
struct jpeg_forward_dct * fdct
Definition: jpeglib.h:402
jpeg_decompress_struct::comps_in_scan
int comps_in_scan
Definition: jpeglib.h:596
jpeg_compress_struct::prep
struct jpeg_c_prep_controller * prep
Definition: jpeglib.h:397
jpeg_progress_mgr::total_passes
int total_passes
Definition: jpeglib.h:707
jpeg_d_coef_controller
Definition: jpegint.h:166
jpeg_decompress_struct::sample_range_limit
JSAMPLE * sample_range_limit
Definition: jpeglib.h:589
jpeg_decompress_struct::output_scanline
JDIMENSION output_scanline
Definition: jpeglib.h:489
jpeg_decompress_struct::output_iMCU_row
JDIMENSION output_iMCU_row
Definition: jpeglib.h:502
jpeg_CreateCompress
jpeg_CreateCompress(j_compress_ptr cinfo, int version, size_t structsize)
Definition: jcapimin.c:30
jpeg_compress_struct::comp_info
jpeg_component_info * comp_info
Definition: jpeglib.h:299
jpeg_compress_struct::Ss
int Ss
Definition: jpeglib.h:390
max_lines
JSAMPARRAY JDIMENSION max_lines
Definition: jpeglib.h:978
jpeg_decompress_struct::saw_Adobe_marker
boolean saw_Adobe_marker
Definition: jpeglib.h:557
format_message
format_message(j_common_ptr cinfo, char *buffer)
Definition: jerror.c:157
jpeg_std_error
jpeg_std_error(struct jpeg_error_mgr *err)
Definition: jerror.c:231
free_pool
free_pool(j_common_ptr cinfo, int pool_id)
Definition: jmemmgr.c:930
jpeg_resync_to_restart
jpeg_resync_to_restart(j_decompress_ptr cinfo, int desired)
Definition: jdmarker.c:1192
jpeg_error_mgr::num_warnings
long num_warnings
Definition: jpeglib.h:676
JCS_RGB
@ JCS_RGB
Definition: jpeglib.h:209
jpeg_set_quality
jpeg_set_quality(j_compress_ptr cinfo, int quality, boolean force_baseline)
Definition: jcparam.c:132
jpeg_compress_struct::image_width
JDIMENSION image_width
Definition: jpeglib.h:279
NUM_QUANT_TBLS
#define NUM_QUANT_TBLS
Definition: jpeglib.h:43
jpeg_decompress_struct::input_scan_number
int input_scan_number
Definition: jpeglib.h:494
jpeg_decompress_struct::actual_number_of_colors
int actual_number_of_colors
Definition: jpeglib.h:478
jpeg_decompress_struct::two_pass_quantize
boolean two_pass_quantize
Definition: jpeglib.h:446
jpeg_component_info::downsampled_width
JDIMENSION downsampled_width
Definition: jpeglib.h:154
num_rows
int JSAMPARRAY int int num_rows
Definition: jpegint.h:375
jpeg_destination_mgr::free_in_buffer
size_t free_in_buffer
Definition: jpeglib.h:715
j_common_ptr
struct jpeg_common_struct * j_common_ptr
Definition: jpeglib.h:261
jpeg_error_mgr::last_jpeg_message
int last_jpeg_message
Definition: jpeglib.h:689
jpeg_compress_struct::image_height
JDIMENSION image_height
Definition: jpeglib.h:280
jpeg_decompress_struct::saw_JFIF_marker
boolean saw_JFIF_marker
Definition: jpeglib.h:550
jpeg_source_mgr::next_input_byte
const JOCTET * next_input_byte
Definition: jpeglib.h:726
JHUFF_TBL
Definition: jpeglib.h:100
version
int version
Definition: jpeglib.h:901
jpeg_decompress_struct::num_components
int num_components
Definition: jpeglib.h:422
jpeg_decompress_struct::arith_dc_U
UINT8 arith_dc_U[NUM_ARITH_TBLS]
Definition: jpeglib.h:542
J_DCT_METHOD
J_DCT_METHOD
Definition: jpeglib.h:217
jpeg_compress_struct::next_scanline
JDIMENSION next_scanline
Definition: jpeglib.h:354
jpeg_decompress_struct::raw_data_out
boolean raw_data_out
Definition: jpeglib.h:437
jpeg_decomp_master
Definition: jpegint.h:137
request_virt_barray
request_virt_barray(j_common_ptr cinfo, int pool_id, boolean pre_zero, JDIMENSION blocksperrow, JDIMENSION numrows, JDIMENSION maxaccess)
Definition: jmemmgr.c:553
jpeg_marker_struct
Definition: jpeglib.h:195
sizeofobject
size_t sizeofobject
Definition: jmemsys.h:47
jpeg_compress_struct::cconvert
struct jpeg_color_converter * cconvert
Definition: jpeglib.h:400
jpeg_compress_struct::num_components
int num_components
Definition: jpeglib.h:296
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JDITHER_NONE
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union jpeg_error_mgr::@6 msg_parm
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jpeg_component_info::height_in_blocks
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jpeg_color_converter
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jpeg_d_post_controller
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UINT16
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jpeg_decompress_struct::scale_num
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dstinfo
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jerror.h
data
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Definition: jpeglib.h:945
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@ JDCT_IFAST
Definition: jpeglib.h:219
jpeg_decompress_struct::input_iMCU_row
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Definition: jpeglib.h:379
EXTERN
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jpeg_error_mgr::jpeg_message_table
const char *const * jpeg_message_table
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JCS_GRAYSCALE
@ JCS_GRAYSCALE
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JDIMENSION MCUs_per_row
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JCS_YCbCr
@ JCS_YCbCr
Definition: jpeglib.h:210
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JCS_CMYK
@ JCS_CMYK
Definition: jpeglib.h:211
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Definition: jpeglib.h:922
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openhrp3
Author(s): AIST, General Robotix Inc., Nakamura Lab of Dept. of Mechano Informatics at University of Tokyo
autogenerated on Wed Sep 7 2022 02:51:03