1 /*
2 * jpeglib.h
3 *
4 * Copyright (C) 1991-1998, Thomas G. Lane.
5 * Modified 2002-2009 by Guido Vollbeding.
6 * This file is part of the Independent JPEG Group's software.
7 * For conditions of distribution and use, see the accompanying README file.
8 *
9 * This file defines the application interface for the JPEG library.
10 * Most applications using the library need only include this file,
11 * and perhaps jerror.h if they want to know the exact error codes.
12 */
13
14 #ifndef JPEGLIB_H
15 #define JPEGLIB_H
16
17 /*
18 * First we include the configuration files that record how this
19 * installation of the JPEG library is set up. jconfig.h can be
20 * generated automatically for many systems. jmorecfg.h contains
21 * manual configuration options that most people need not worry about.
22 */
23
24 #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */
25 #include "jconfig.h" /* widely used configuration options */
26 #endif
27 #include "jmorecfg.h" /* seldom changed options */
28
29
30 #ifdef __cplusplus
31 #ifndef DONT_USE_EXTERN_C
32 extern "C" {
33 #endif
34 #endif
35
36 /* Version ID for the JPEG library.
37 * Might be useful for tests like "#if JPEG_LIB_VERSION >= 70".
38 */
39
40 #define JPEG_LIB_VERSION 70 /* Version 7.0 */
41
42
43 /* Various constants determining the sizes of things.
44 * All of these are specified by the JPEG standard, so don't change them
45 * if you want to be compatible.
46 */
47
48 #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */
49 #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */
50 #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */
51 #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */
52 #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */
53 #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */
54 #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */
55 /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
56 * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
57 * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
58 * to handle it. We even let you do this from the jconfig.h file. However,
59 * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
60 * sometimes emits noncompliant files doesn't mean you should too.
61 */
62 #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */
63 #ifndef D_MAX_BLOCKS_IN_MCU
64 #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */
65 #endif
66
67
68 /* Data structures for images (arrays of samples and of DCT coefficients).
138
139 /* Remaining fields should be treated as private by applications. */
140
141 /* These values are computed during compression or decompression startup: */
142 /* Component's size in DCT blocks.
143 * Any dummy blocks added to complete an MCU are not counted; therefore
144 * these values do not depend on whether a scan is interleaved or not.
145 */
146 JDIMENSION width_in_blocks;
147 JDIMENSION height_in_blocks;
148 /* Size of a DCT block in samples,
149 * reflecting any scaling we choose to apply during the DCT step.
150 * Values from 1 to 16 are supported.
151 * Note that different components may receive different DCT scalings.
152 */
153 int DCT_h_scaled_size;
154 int DCT_v_scaled_size;
155 /* The downsampled dimensions are the component's actual, unpadded number
156 * of samples at the main buffer (preprocessing/compression interface);
157 * DCT scaling is included, so
158 * downsampled_width = ceil(image_width * Hi/Hmax * DCT_h_scaled_size/DCTSIZE)
159 * and similarly for height.
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 blocks per MCU, horizontally */
172 int MCU_height; /* number of blocks per MCU, vertically */
173 int MCU_blocks; /* MCU_width * MCU_height */
174 int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */
175 int last_col_width; /* # of non-dummy blocks across in last MCU */
176 int last_row_height; /* # of non-dummy blocks 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;
186 } jpeg_component_info;
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 */
196 } jpeg_scan_info;
197
198 /* The decompressor can save APPn and COM markers in a list of these: */
199
200 typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr;
201
202 struct jpeg_marker_struct {
203 jpeg_saved_marker_ptr next; /* next in list, or NULL */
204 UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */
205 unsigned int original_length; /* # bytes of data in the file */
206 unsigned int data_length; /* # bytes of data saved at data[] */
207 JOCTET FAR * data; /* the data contained in the marker */
208 /* the marker length word is not counted in data_length or original_length */
209 };
210
211 /* Known color spaces. */
212
213 typedef enum {
214 JCS_UNKNOWN, /* error/unspecified */
215 JCS_GRAYSCALE, /* monochrome */
216 JCS_RGB, /* red/green/blue */
217 JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */
218 JCS_CMYK, /* C/M/Y/K */
219 JCS_YCCK /* Y/Cb/Cr/K */
220 } J_COLOR_SPACE;
221
222 /* DCT/IDCT algorithm options. */
223
224 typedef enum {
225 JDCT_ISLOW, /* slow but accurate integer algorithm */
226 JDCT_IFAST, /* faster, less accurate integer method */
227 JDCT_FLOAT /* floating-point: accurate, fast on fast HW */
228 } J_DCT_METHOD;
229
230 #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */
231 #define JDCT_DEFAULT JDCT_ISLOW
232 #endif
233 #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */
234 #define JDCT_FASTEST JDCT_IFAST
235 #endif
236
237 /* Dithering options for decompression. */
238
239 typedef enum {
240 JDITHER_NONE, /* no dithering */
241 JDITHER_ORDERED, /* simple ordered dither */
351 * (in which case the correct restart_interval will be figured
352 * for each scan).
353 */
354 unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
355 int restart_in_rows; /* if > 0, MCU rows per restart interval */
356
357 /* Parameters controlling emission of special markers. */
358
359 boolean write_JFIF_header; /* should a JFIF marker be written? */
360 UINT8 JFIF_major_version; /* What to write for the JFIF version number */
361 UINT8 JFIF_minor_version;
362 /* These three values are not used by the JPEG code, merely copied */
363 /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */
364 /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */
365 /* ratio is defined by X_density/Y_density even when density_unit=0. */
366 UINT8 density_unit; /* JFIF code for pixel size units */
367 UINT16 X_density; /* Horizontal pixel density */
368 UINT16 Y_density; /* Vertical pixel density */
369 boolean write_Adobe_marker; /* should an Adobe marker be written? */
370
371 /* State variable: index of next scanline to be written to
372 * jpeg_write_scanlines(). Application may use this to control its
373 * processing loop, e.g., "while (next_scanline < image_height)".
374 */
375
376 JDIMENSION next_scanline; /* 0 .. image_height-1 */
377
378 /* Remaining fields are known throughout compressor, but generally
379 * should not be touched by a surrounding application.
380 */
381
382 /*
383 * These fields are computed during compression startup
384 */
385 boolean progressive_mode; /* TRUE if scan script uses progressive mode */
386 int max_h_samp_factor; /* largest h_samp_factor */
387 int max_v_samp_factor; /* largest v_samp_factor */
388
389 int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
390 int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
391
392 JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */
393 /* The coefficient controller receives data in units of MCU rows as defined
394 * for fully interleaved scans (whether the JPEG file is interleaved or not).
395 * There are v_samp_factor * DCTSIZE sample rows of each component in an
396 * "iMCU" (interleaved MCU) row.
397 */
398
399 /*
400 * These fields are valid during any one scan.
401 * They describe the components and MCUs actually appearing in the scan.
402 */
403 int comps_in_scan; /* # of JPEG components in this scan */
404 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
405 /* *cur_comp_info[i] describes component that appears i'th in SOS */
406
407 JDIMENSION MCUs_per_row; /* # of MCUs across the image */
408 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
409
410 int blocks_in_MCU; /* # of DCT blocks per MCU */
411 int MCU_membership[C_MAX_BLOCKS_IN_MCU];
412 /* MCU_membership[i] is index in cur_comp_info of component owning */
413 /* i'th block in an MCU */
414
415 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
416
417 /*
418 * Links to compression subobjects (methods and private variables of modules)
419 */
420 struct jpeg_comp_master * master;
421 struct jpeg_c_main_controller * main;
422 struct jpeg_c_prep_controller * prep;
423 struct jpeg_c_coef_controller * coef;
424 struct jpeg_marker_writer * marker;
425 struct jpeg_color_converter * cconvert;
426 struct jpeg_downsampler * downsample;
427 struct jpeg_forward_dct * fdct;
428 struct jpeg_entropy_encoder * entropy;
429 jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */
430 int script_space_size;
431 };
432
433
434 /* Master record for a decompression instance */
435
436 struct jpeg_decompress_struct {
543 /* Quantization and Huffman tables are carried forward across input
544 * datastreams when processing abbreviated JPEG datastreams.
545 */
546
547 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
548 /* ptrs to coefficient quantization tables, or NULL if not defined */
549
550 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
551 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
552 /* ptrs to Huffman coding tables, or NULL if not defined */
553
554 /* These parameters are never carried across datastreams, since they
555 * are given in SOF/SOS markers or defined to be reset by SOI.
556 */
557
558 int data_precision; /* bits of precision in image data */
559
560 jpeg_component_info * comp_info;
561 /* comp_info[i] describes component that appears i'th in SOF */
562
563 boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */
564 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
565
566 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
567 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
568 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
569
570 unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */
571
572 /* These fields record data obtained from optional markers recognized by
573 * the JPEG library.
574 */
575 boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */
576 /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
577 UINT8 JFIF_major_version; /* JFIF version number */
578 UINT8 JFIF_minor_version;
579 UINT8 density_unit; /* JFIF code for pixel size units */
580 UINT16 X_density; /* Horizontal pixel density */
581 UINT16 Y_density; /* Vertical pixel density */
582 boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */
583 UINT8 Adobe_transform; /* Color transform code from Adobe marker */
584
585 boolean CCIR601_sampling; /* TRUE=first samples are cosited */
586
587 /* Aside from the specific data retained from APPn markers known to the
588 * library, the uninterpreted contents of any or all APPn and COM markers
589 * can be saved in a list for examination by the application.
590 */
591 jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */
592
593 /* Remaining fields are known throughout decompressor, but generally
594 * should not be touched by a surrounding application.
595 */
596
597 /*
598 * These fields are computed during decompression startup
599 */
600 int max_h_samp_factor; /* largest h_samp_factor */
601 int max_v_samp_factor; /* largest v_samp_factor */
602
603 int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
604 int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
605
606 JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */
607 /* The coefficient controller's input and output progress is measured in
608 * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows
609 * in fully interleaved JPEG scans, but are used whether the scan is
610 * interleaved or not. We define an iMCU row as v_samp_factor DCT block
611 * rows of each component. Therefore, the IDCT output contains
612 * v_samp_factor*DCT_v_scaled_size sample rows of a component per iMCU row.
613 */
614
615 JSAMPLE * sample_range_limit; /* table for fast range-limiting */
616
617 /*
618 * These fields are valid during any one scan.
619 * They describe the components and MCUs actually appearing in the scan.
620 * Note that the decompressor output side must not use these fields.
621 */
622 int comps_in_scan; /* # of JPEG components in this scan */
623 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
624 /* *cur_comp_info[i] describes component that appears i'th in SOS */
625
626 JDIMENSION MCUs_per_row; /* # of MCUs across the image */
627 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
628
629 int blocks_in_MCU; /* # of DCT blocks per MCU */
630 int MCU_membership[D_MAX_BLOCKS_IN_MCU];
631 /* MCU_membership[i] is index in cur_comp_info of component owning */
632 /* i'th block in an MCU */
633
634 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
635
636 /* This field is shared between entropy decoder and marker parser.
637 * It is either zero or the code of a JPEG marker that has been
638 * read from the data source, but has not yet been processed.
639 */
640 int unread_marker;
641
642 /*
643 * Links to decompression subobjects (methods, private variables of modules)
644 */
645 struct jpeg_decomp_master * master;
646 struct jpeg_d_main_controller * main;
647 struct jpeg_d_coef_controller * coef;
648 struct jpeg_d_post_controller * post;
649 struct jpeg_input_controller * inputctl;
650 struct jpeg_marker_reader * marker;
651 struct jpeg_entropy_decoder * entropy;
652 struct jpeg_inverse_dct * idct;
653 struct jpeg_upsampler * upsample;
654 struct jpeg_color_deconverter * cconvert;
655 struct jpeg_color_quantizer * cquantize;
656 };
657
658
659 /* "Object" declarations for JPEG modules that may be supplied or called
660 * directly by the surrounding application.
661 * As with all objects in the JPEG library, these structs only define the
662 * publicly visible methods and state variables of a module. Additional
663 * private fields may exist after the public ones.
664 */
665
666
667 /* Error handler object */
668
669 struct jpeg_error_mgr {
670 /* Error exit handler: does not return to caller */
671 JMETHOD(void, error_exit, (j_common_ptr cinfo));
672 /* Conditionally emit a trace or warning message */
673 JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
674 /* Routine that actually outputs a trace or error message */
675 JMETHOD(void, output_message, (j_common_ptr cinfo));
676 /* Format a message string for the most recent JPEG error or message */
677 JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer));
678 #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */
679 /* Reset error state variables at start of a new image */
680 JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));
681
682 /* The message ID code and any parameters are saved here.
683 * A message can have one string parameter or up to 8 int parameters.
684 */
685 int msg_code;
686 #define JMSG_STR_PARM_MAX 80
687 union {
688 int i[8];
689 char s[JMSG_STR_PARM_MAX];
690 } msg_parm;
691
845 #else
846 #define JPP(arglist) ()
847 #endif
848
849
850 /* Short forms of external names for systems with brain-damaged linkers.
851 * We shorten external names to be unique in the first six letters, which
852 * is good enough for all known systems.
853 * (If your compiler itself needs names to be unique in less than 15
854 * characters, you are out of luck. Get a better compiler.)
855 */
856
857 #ifdef NEED_SHORT_EXTERNAL_NAMES
858 #define jpeg_std_error jStdError
859 #define jpeg_CreateCompress jCreaCompress
860 #define jpeg_CreateDecompress jCreaDecompress
861 #define jpeg_destroy_compress jDestCompress
862 #define jpeg_destroy_decompress jDestDecompress
863 #define jpeg_stdio_dest jStdDest
864 #define jpeg_stdio_src jStdSrc
865 #define jpeg_set_defaults jSetDefaults
866 #define jpeg_set_colorspace jSetColorspace
867 #define jpeg_default_colorspace jDefColorspace
868 #define jpeg_set_quality jSetQuality
869 #define jpeg_set_linear_quality jSetLQuality
870 #define jpeg_default_qtables jDefQTables
871 #define jpeg_add_quant_table jAddQuantTable
872 #define jpeg_quality_scaling jQualityScaling
873 #define jpeg_simple_progression jSimProgress
874 #define jpeg_suppress_tables jSuppressTables
875 #define jpeg_alloc_quant_table jAlcQTable
876 #define jpeg_alloc_huff_table jAlcHTable
877 #define jpeg_start_compress jStrtCompress
878 #define jpeg_write_scanlines jWrtScanlines
879 #define jpeg_finish_compress jFinCompress
880 #define jpeg_calc_jpeg_dimensions jCjpegDimensions
881 #define jpeg_write_raw_data jWrtRawData
882 #define jpeg_write_marker jWrtMarker
883 #define jpeg_write_m_header jWrtMHeader
884 #define jpeg_write_m_byte jWrtMByte
885 #define jpeg_write_tables jWrtTables
886 #define jpeg_read_header jReadHeader
887 #define jpeg_start_decompress jStrtDecompress
888 #define jpeg_read_scanlines jReadScanlines
889 #define jpeg_finish_decompress jFinDecompress
890 #define jpeg_read_raw_data jReadRawData
891 #define jpeg_has_multiple_scans jHasMultScn
892 #define jpeg_start_output jStrtOutput
893 #define jpeg_finish_output jFinOutput
894 #define jpeg_input_complete jInComplete
895 #define jpeg_new_colormap jNewCMap
896 #define jpeg_consume_input jConsumeInput
897 #define jpeg_calc_output_dimensions jCalcDimensions
898 #define jpeg_save_markers jSaveMarkers
899 #define jpeg_set_marker_processor jSetMarker
900 #define jpeg_read_coefficients jReadCoefs
901 #define jpeg_write_coefficients jWrtCoefs
902 #define jpeg_copy_critical_parameters jCopyCrit
903 #define jpeg_abort_compress jAbrtCompress
904 #define jpeg_abort_decompress jAbrtDecompress
905 #define jpeg_abort jAbort
906 #define jpeg_destroy jDestroy
907 #define jpeg_resync_to_restart jResyncRestart
908 #endif /* NEED_SHORT_EXTERNAL_NAMES */
909
910
911 /* Default error-management setup */
912 EXTERN(struct jpeg_error_mgr *) jpeg_std_error
913 JPP((struct jpeg_error_mgr * err));
914
915 /* Initialization of JPEG compression objects.
916 * jpeg_create_compress() and jpeg_create_decompress() are the exported
921 */
922 #define jpeg_create_compress(cinfo) \
923 jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
924 (size_t) sizeof(struct jpeg_compress_struct))
925 #define jpeg_create_decompress(cinfo) \
926 jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
927 (size_t) sizeof(struct jpeg_decompress_struct))
928 EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo,
929 int version, size_t structsize));
930 EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo,
931 int version, size_t structsize));
932 /* Destruction of JPEG compression objects */
933 EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo));
934 EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));
935
936 /* Standard data source and destination managers: stdio streams. */
937 /* Caller is responsible for opening the file before and closing after. */
938 EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
939 EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile));
940
941 /* Default parameter setup for compression */
942 EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo));
943 /* Compression parameter setup aids */
944 EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo,
945 J_COLOR_SPACE colorspace));
946 EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo));
947 EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality,
948 boolean force_baseline));
949 EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo,
950 int scale_factor,
951 boolean force_baseline));
952 EXTERN(void) jpeg_default_qtables JPP((j_compress_ptr cinfo,
953 boolean force_baseline));
954 EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl,
955 const unsigned int *basic_table,
956 int scale_factor,
957 boolean force_baseline));
958 EXTERN(int) jpeg_quality_scaling JPP((int quality));
959 EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo));
960 EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo,
1015 EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo,
1016 JSAMPIMAGE data,
1017 JDIMENSION max_lines));
1018
1019 /* Additional entry points for buffered-image mode. */
1020 EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo));
1021 EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo,
1022 int scan_number));
1023 EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo));
1024 EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo));
1025 EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo));
1026 EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo));
1027 /* Return value is one of: */
1028 /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */
1029 #define JPEG_REACHED_SOS 1 /* Reached start of new scan */
1030 #define JPEG_REACHED_EOI 2 /* Reached end of image */
1031 #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */
1032 #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */
1033
1034 /* Precalculate output dimensions for current decompression parameters. */
1035 EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
1036
1037 /* Control saving of COM and APPn markers into marker_list. */
1038 EXTERN(void) jpeg_save_markers
1039 JPP((j_decompress_ptr cinfo, int marker_code,
1040 unsigned int length_limit));
1041
1042 /* Install a special processing method for COM or APPn markers. */
1043 EXTERN(void) jpeg_set_marker_processor
1044 JPP((j_decompress_ptr cinfo, int marker_code,
1045 jpeg_marker_parser_method routine));
1046
1047 /* Read or write raw DCT coefficients --- useful for lossless transcoding. */
1048 EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
1049 EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo,
1050 jvirt_barray_ptr * coef_arrays));
1051 EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo,
1052 j_compress_ptr dstinfo));
1053
1054 /* If you choose to abort compression or decompression before completing
|
1 /*
2 * jpeglib.h
3 *
4 * Copyright (C) 1991-1998, Thomas G. Lane.
5 * Modified 2002-2017 by Guido Vollbeding.
6 * This file is part of the Independent JPEG Group's software.
7 * For conditions of distribution and use, see the accompanying README file.
8 *
9 * This file defines the application interface for the JPEG library.
10 * Most applications using the library need only include this file,
11 * and perhaps jerror.h if they want to know the exact error codes.
12 */
13
14 #ifndef JPEGLIB_H
15 #define JPEGLIB_H
16
17 /*
18 * First we include the configuration files that record how this
19 * installation of the JPEG library is set up. jconfig.h can be
20 * generated automatically for many systems. jmorecfg.h contains
21 * manual configuration options that most people need not worry about.
22 */
23
24 #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */
25 #include "jconfig.h" /* widely used configuration options */
26 #endif
27 #include "jmorecfg.h" /* seldom changed options */
28
29
30 #ifdef __cplusplus
31 #ifndef DONT_USE_EXTERN_C
32 extern "C" {
33 #endif
34 #endif
35
36 /* Version IDs for the JPEG library.
37 * Might be useful for tests like "#if JPEG_LIB_VERSION >= 90".
38 */
39
40 #define JPEG_LIB_VERSION 90 /* Compatibility version 9.0 */
41 #define JPEG_LIB_VERSION_MAJOR 9
42 #define JPEG_LIB_VERSION_MINOR 3
43
44
45 /* Various constants determining the sizes of things.
46 * All of these are specified by the JPEG standard,
47 * so don't change them if you want to be compatible.
48 */
49
50 #define DCTSIZE 8 /* The basic DCT block is 8x8 coefficients */
51 #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */
52 #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */
53 #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */
54 #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */
55 #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */
56 #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */
57 /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
58 * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
59 * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
60 * to handle it. We even let you do this from the jconfig.h file. However,
61 * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
62 * sometimes emits noncompliant files doesn't mean you should too.
63 */
64 #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */
65 #ifndef D_MAX_BLOCKS_IN_MCU
66 #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */
67 #endif
68
69
70 /* Data structures for images (arrays of samples and of DCT coefficients).
140
141 /* Remaining fields should be treated as private by applications. */
142
143 /* These values are computed during compression or decompression startup: */
144 /* Component's size in DCT blocks.
145 * Any dummy blocks added to complete an MCU are not counted; therefore
146 * these values do not depend on whether a scan is interleaved or not.
147 */
148 JDIMENSION width_in_blocks;
149 JDIMENSION height_in_blocks;
150 /* Size of a DCT block in samples,
151 * reflecting any scaling we choose to apply during the DCT step.
152 * Values from 1 to 16 are supported.
153 * Note that different components may receive different DCT scalings.
154 */
155 int DCT_h_scaled_size;
156 int DCT_v_scaled_size;
157 /* The downsampled dimensions are the component's actual, unpadded number
158 * of samples at the main buffer (preprocessing/compression interface);
159 * DCT scaling is included, so
160 * downsampled_width =
161 * ceil(image_width * Hi/Hmax * DCT_h_scaled_size/block_size)
162 * and similarly for height.
163 */
164 JDIMENSION downsampled_width; /* actual width in samples */
165 JDIMENSION downsampled_height; /* actual height in samples */
166 /* For decompression, in cases where some of the components will be
167 * ignored (eg grayscale output from YCbCr image), we can skip most
168 * computations for the unused components.
169 * For compression, some of the components will need further quantization
170 * scale by factor of 2 after DCT (eg BG_YCC output from normal RGB input).
171 * The field is first set TRUE for decompression, FALSE for compression
172 * in initial_setup, and then adapted in color conversion setup.
173 */
174 boolean component_needed;
175
176 /* These values are computed before starting a scan of the component. */
177 /* The decompressor output side may not use these variables. */
178 int MCU_width; /* number of blocks per MCU, horizontally */
179 int MCU_height; /* number of blocks per MCU, vertically */
180 int MCU_blocks; /* MCU_width * MCU_height */
181 int MCU_sample_width; /* MCU width in samples: MCU_width * DCT_h_scaled_size */
182 int last_col_width; /* # of non-dummy blocks across in last MCU */
183 int last_row_height; /* # of non-dummy blocks down in last MCU */
184
185 /* Saved quantization table for component; NULL if none yet saved.
186 * See jdinput.c comments about the need for this information.
187 * This field is currently used only for decompression.
188 */
189 JQUANT_TBL * quant_table;
190
191 /* Private per-component storage for DCT or IDCT subsystem. */
192 void * dct_table;
193 } jpeg_component_info;
194
195
196 /* The script for encoding a multiple-scan file is an array of these: */
197
198 typedef struct {
199 int comps_in_scan; /* number of components encoded in this scan */
200 int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */
201 int Ss, Se; /* progressive JPEG spectral selection parms */
203 } jpeg_scan_info;
204
205 /* The decompressor can save APPn and COM markers in a list of these: */
206
207 typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr;
208
209 struct jpeg_marker_struct {
210 jpeg_saved_marker_ptr next; /* next in list, or NULL */
211 UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */
212 unsigned int original_length; /* # bytes of data in the file */
213 unsigned int data_length; /* # bytes of data saved at data[] */
214 JOCTET FAR * data; /* the data contained in the marker */
215 /* the marker length word is not counted in data_length or original_length */
216 };
217
218 /* Known color spaces. */
219
220 typedef enum {
221 JCS_UNKNOWN, /* error/unspecified */
222 JCS_GRAYSCALE, /* monochrome */
223 JCS_RGB, /* red/green/blue, standard RGB (sRGB) */
224 JCS_YCbCr, /* Y/Cb/Cr (also known as YUV), standard YCC */
225 JCS_CMYK, /* C/M/Y/K */
226 JCS_YCCK, /* Y/Cb/Cr/K */
227 JCS_BG_RGB, /* big gamut red/green/blue, bg-sRGB */
228 JCS_BG_YCC /* big gamut Y/Cb/Cr, bg-sYCC */
229 } J_COLOR_SPACE;
230
231 /* Supported color transforms. */
232
233 typedef enum {
234 JCT_NONE = 0,
235 JCT_SUBTRACT_GREEN = 1
236 } J_COLOR_TRANSFORM;
237
238 /* DCT/IDCT algorithm options. */
239
240 typedef enum {
241 JDCT_ISLOW, /* slow but accurate integer algorithm */
242 JDCT_IFAST, /* faster, less accurate integer method */
243 JDCT_FLOAT /* floating-point: accurate, fast on fast HW */
244 } J_DCT_METHOD;
245
246 #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */
247 #define JDCT_DEFAULT JDCT_ISLOW
248 #endif
249 #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */
250 #define JDCT_FASTEST JDCT_IFAST
251 #endif
252
253 /* Dithering options for decompression. */
254
255 typedef enum {
256 JDITHER_NONE, /* no dithering */
257 JDITHER_ORDERED, /* simple ordered dither */
367 * (in which case the correct restart_interval will be figured
368 * for each scan).
369 */
370 unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
371 int restart_in_rows; /* if > 0, MCU rows per restart interval */
372
373 /* Parameters controlling emission of special markers. */
374
375 boolean write_JFIF_header; /* should a JFIF marker be written? */
376 UINT8 JFIF_major_version; /* What to write for the JFIF version number */
377 UINT8 JFIF_minor_version;
378 /* These three values are not used by the JPEG code, merely copied */
379 /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */
380 /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */
381 /* ratio is defined by X_density/Y_density even when density_unit=0. */
382 UINT8 density_unit; /* JFIF code for pixel size units */
383 UINT16 X_density; /* Horizontal pixel density */
384 UINT16 Y_density; /* Vertical pixel density */
385 boolean write_Adobe_marker; /* should an Adobe marker be written? */
386
387 J_COLOR_TRANSFORM color_transform;
388 /* Color transform identifier, writes LSE marker if nonzero */
389
390 /* State variable: index of next scanline to be written to
391 * jpeg_write_scanlines(). Application may use this to control its
392 * processing loop, e.g., "while (next_scanline < image_height)".
393 */
394
395 JDIMENSION next_scanline; /* 0 .. image_height-1 */
396
397 /* Remaining fields are known throughout compressor, but generally
398 * should not be touched by a surrounding application.
399 */
400
401 /*
402 * These fields are computed during compression startup
403 */
404 boolean progressive_mode; /* TRUE if scan script uses progressive mode */
405 int max_h_samp_factor; /* largest h_samp_factor */
406 int max_v_samp_factor; /* largest v_samp_factor */
407
408 int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
409 int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
410
411 JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */
412 /* The coefficient controller receives data in units of MCU rows as defined
413 * for fully interleaved scans (whether the JPEG file is interleaved or not).
414 * There are v_samp_factor * DCT_v_scaled_size sample rows of each component
415 * in an "iMCU" (interleaved MCU) row.
416 */
417
418 /*
419 * These fields are valid during any one scan.
420 * They describe the components and MCUs actually appearing in the scan.
421 */
422 int comps_in_scan; /* # of JPEG components in this scan */
423 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
424 /* *cur_comp_info[i] describes component that appears i'th in SOS */
425
426 JDIMENSION MCUs_per_row; /* # of MCUs across the image */
427 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
428
429 int blocks_in_MCU; /* # of DCT blocks per MCU */
430 int MCU_membership[C_MAX_BLOCKS_IN_MCU];
431 /* MCU_membership[i] is index in cur_comp_info of component owning */
432 /* i'th block in an MCU */
433
434 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
435
436 int block_size; /* the basic DCT block size: 1..16 */
437 const int * natural_order; /* natural-order position array */
438 int lim_Se; /* min( Se, DCTSIZE2-1 ) */
439
440 /*
441 * Links to compression subobjects (methods and private variables of modules)
442 */
443 struct jpeg_comp_master * master;
444 struct jpeg_c_main_controller * main;
445 struct jpeg_c_prep_controller * prep;
446 struct jpeg_c_coef_controller * coef;
447 struct jpeg_marker_writer * marker;
448 struct jpeg_color_converter * cconvert;
449 struct jpeg_downsampler * downsample;
450 struct jpeg_forward_dct * fdct;
451 struct jpeg_entropy_encoder * entropy;
452 jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */
453 int script_space_size;
454 };
455
456
457 /* Master record for a decompression instance */
458
459 struct jpeg_decompress_struct {
566 /* Quantization and Huffman tables are carried forward across input
567 * datastreams when processing abbreviated JPEG datastreams.
568 */
569
570 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS];
571 /* ptrs to coefficient quantization tables, or NULL if not defined */
572
573 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
574 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
575 /* ptrs to Huffman coding tables, or NULL if not defined */
576
577 /* These parameters are never carried across datastreams, since they
578 * are given in SOF/SOS markers or defined to be reset by SOI.
579 */
580
581 int data_precision; /* bits of precision in image data */
582
583 jpeg_component_info * comp_info;
584 /* comp_info[i] describes component that appears i'th in SOF */
585
586 boolean is_baseline; /* TRUE if Baseline SOF0 encountered */
587 boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */
588 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
589
590 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
591 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
592 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
593
594 unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */
595
596 /* These fields record data obtained from optional markers recognized by
597 * the JPEG library.
598 */
599 boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */
600 /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
601 UINT8 JFIF_major_version; /* JFIF version number */
602 UINT8 JFIF_minor_version;
603 UINT8 density_unit; /* JFIF code for pixel size units */
604 UINT16 X_density; /* Horizontal pixel density */
605 UINT16 Y_density; /* Vertical pixel density */
606 boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */
607 UINT8 Adobe_transform; /* Color transform code from Adobe marker */
608
609 J_COLOR_TRANSFORM color_transform;
610 /* Color transform identifier derived from LSE marker, otherwise zero */
611
612 boolean CCIR601_sampling; /* TRUE=first samples are cosited */
613
614 /* Aside from the specific data retained from APPn markers known to the
615 * library, the uninterpreted contents of any or all APPn and COM markers
616 * can be saved in a list for examination by the application.
617 */
618 jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */
619
620 /* Remaining fields are known throughout decompressor, but generally
621 * should not be touched by a surrounding application.
622 */
623
624 /*
625 * These fields are computed during decompression startup
626 */
627 int max_h_samp_factor; /* largest h_samp_factor */
628 int max_v_samp_factor; /* largest v_samp_factor */
629
630 int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
631 int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
632
633 JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */
634 /* The coefficient controller's input and output progress is measured in
635 * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows
636 * in fully interleaved JPEG scans, but are used whether the scan is
637 * interleaved or not. We define an iMCU row as v_samp_factor DCT block
638 * rows of each component. Therefore, the IDCT output contains
639 * v_samp_factor * DCT_v_scaled_size sample rows of a component per iMCU row.
640 */
641
642 JSAMPLE * sample_range_limit; /* table for fast range-limiting */
643
644 /*
645 * These fields are valid during any one scan.
646 * They describe the components and MCUs actually appearing in the scan.
647 * Note that the decompressor output side must not use these fields.
648 */
649 int comps_in_scan; /* # of JPEG components in this scan */
650 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN];
651 /* *cur_comp_info[i] describes component that appears i'th in SOS */
652
653 JDIMENSION MCUs_per_row; /* # of MCUs across the image */
654 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
655
656 int blocks_in_MCU; /* # of DCT blocks per MCU */
657 int MCU_membership[D_MAX_BLOCKS_IN_MCU];
658 /* MCU_membership[i] is index in cur_comp_info of component owning */
659 /* i'th block in an MCU */
660
661 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
662
663 /* These fields are derived from Se of first SOS marker.
664 */
665 int block_size; /* the basic DCT block size: 1..16 */
666 const int * natural_order; /* natural-order position array for entropy decode */
667 int lim_Se; /* min( Se, DCTSIZE2-1 ) for entropy decode */
668
669 /* This field is shared between entropy decoder and marker parser.
670 * It is either zero or the code of a JPEG marker that has been
671 * read from the data source, but has not yet been processed.
672 */
673 int unread_marker;
674
675 /*
676 * Links to decompression subobjects (methods, private variables of modules)
677 */
678 struct jpeg_decomp_master * master;
679 struct jpeg_d_main_controller * main;
680 struct jpeg_d_coef_controller * coef;
681 struct jpeg_d_post_controller * post;
682 struct jpeg_input_controller * inputctl;
683 struct jpeg_marker_reader * marker;
684 struct jpeg_entropy_decoder * entropy;
685 struct jpeg_inverse_dct * idct;
686 struct jpeg_upsampler * upsample;
687 struct jpeg_color_deconverter * cconvert;
688 struct jpeg_color_quantizer * cquantize;
689 };
690
691
692 /* "Object" declarations for JPEG modules that may be supplied or called
693 * directly by the surrounding application.
694 * As with all objects in the JPEG library, these structs only define the
695 * publicly visible methods and state variables of a module. Additional
696 * private fields may exist after the public ones.
697 */
698
699
700 /* Error handler object */
701
702 struct jpeg_error_mgr {
703 /* Error exit handler: does not return to caller */
704 JMETHOD(noreturn_t, error_exit, (j_common_ptr cinfo));
705 /* Conditionally emit a trace or warning message */
706 JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level));
707 /* Routine that actually outputs a trace or error message */
708 JMETHOD(void, output_message, (j_common_ptr cinfo));
709 /* Format a message string for the most recent JPEG error or message */
710 JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer));
711 #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */
712 /* Reset error state variables at start of a new image */
713 JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo));
714
715 /* The message ID code and any parameters are saved here.
716 * A message can have one string parameter or up to 8 int parameters.
717 */
718 int msg_code;
719 #define JMSG_STR_PARM_MAX 80
720 union {
721 int i[8];
722 char s[JMSG_STR_PARM_MAX];
723 } msg_parm;
724
878 #else
879 #define JPP(arglist) ()
880 #endif
881
882
883 /* Short forms of external names for systems with brain-damaged linkers.
884 * We shorten external names to be unique in the first six letters, which
885 * is good enough for all known systems.
886 * (If your compiler itself needs names to be unique in less than 15
887 * characters, you are out of luck. Get a better compiler.)
888 */
889
890 #ifdef NEED_SHORT_EXTERNAL_NAMES
891 #define jpeg_std_error jStdError
892 #define jpeg_CreateCompress jCreaCompress
893 #define jpeg_CreateDecompress jCreaDecompress
894 #define jpeg_destroy_compress jDestCompress
895 #define jpeg_destroy_decompress jDestDecompress
896 #define jpeg_stdio_dest jStdDest
897 #define jpeg_stdio_src jStdSrc
898 #define jpeg_mem_dest jMemDest
899 #define jpeg_mem_src jMemSrc
900 #define jpeg_set_defaults jSetDefaults
901 #define jpeg_set_colorspace jSetColorspace
902 #define jpeg_default_colorspace jDefColorspace
903 #define jpeg_set_quality jSetQuality
904 #define jpeg_set_linear_quality jSetLQuality
905 #define jpeg_default_qtables jDefQTables
906 #define jpeg_add_quant_table jAddQuantTable
907 #define jpeg_quality_scaling jQualityScaling
908 #define jpeg_simple_progression jSimProgress
909 #define jpeg_suppress_tables jSuppressTables
910 #define jpeg_alloc_quant_table jAlcQTable
911 #define jpeg_alloc_huff_table jAlcHTable
912 #define jpeg_start_compress jStrtCompress
913 #define jpeg_write_scanlines jWrtScanlines
914 #define jpeg_finish_compress jFinCompress
915 #define jpeg_calc_jpeg_dimensions jCjpegDimensions
916 #define jpeg_write_raw_data jWrtRawData
917 #define jpeg_write_marker jWrtMarker
918 #define jpeg_write_m_header jWrtMHeader
919 #define jpeg_write_m_byte jWrtMByte
920 #define jpeg_write_tables jWrtTables
921 #define jpeg_read_header jReadHeader
922 #define jpeg_start_decompress jStrtDecompress
923 #define jpeg_read_scanlines jReadScanlines
924 #define jpeg_finish_decompress jFinDecompress
925 #define jpeg_read_raw_data jReadRawData
926 #define jpeg_has_multiple_scans jHasMultScn
927 #define jpeg_start_output jStrtOutput
928 #define jpeg_finish_output jFinOutput
929 #define jpeg_input_complete jInComplete
930 #define jpeg_new_colormap jNewCMap
931 #define jpeg_consume_input jConsumeInput
932 #define jpeg_core_output_dimensions jCoreDimensions
933 #define jpeg_calc_output_dimensions jCalcDimensions
934 #define jpeg_save_markers jSaveMarkers
935 #define jpeg_set_marker_processor jSetMarker
936 #define jpeg_read_coefficients jReadCoefs
937 #define jpeg_write_coefficients jWrtCoefs
938 #define jpeg_copy_critical_parameters jCopyCrit
939 #define jpeg_abort_compress jAbrtCompress
940 #define jpeg_abort_decompress jAbrtDecompress
941 #define jpeg_abort jAbort
942 #define jpeg_destroy jDestroy
943 #define jpeg_resync_to_restart jResyncRestart
944 #endif /* NEED_SHORT_EXTERNAL_NAMES */
945
946
947 /* Default error-management setup */
948 EXTERN(struct jpeg_error_mgr *) jpeg_std_error
949 JPP((struct jpeg_error_mgr * err));
950
951 /* Initialization of JPEG compression objects.
952 * jpeg_create_compress() and jpeg_create_decompress() are the exported
957 */
958 #define jpeg_create_compress(cinfo) \
959 jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
960 (size_t) sizeof(struct jpeg_compress_struct))
961 #define jpeg_create_decompress(cinfo) \
962 jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
963 (size_t) sizeof(struct jpeg_decompress_struct))
964 EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo,
965 int version, size_t structsize));
966 EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo,
967 int version, size_t structsize));
968 /* Destruction of JPEG compression objects */
969 EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo));
970 EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo));
971
972 /* Standard data source and destination managers: stdio streams. */
973 /* Caller is responsible for opening the file before and closing after. */
974 EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile));
975 EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile));
976
977 /* Data source and destination managers: memory buffers. */
978 EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo,
979 unsigned char ** outbuffer,
980 unsigned long * outsize));
981 EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo,
982 const unsigned char * inbuffer,
983 unsigned long insize));
984
985 /* Default parameter setup for compression */
986 EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo));
987 /* Compression parameter setup aids */
988 EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo,
989 J_COLOR_SPACE colorspace));
990 EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo));
991 EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality,
992 boolean force_baseline));
993 EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo,
994 int scale_factor,
995 boolean force_baseline));
996 EXTERN(void) jpeg_default_qtables JPP((j_compress_ptr cinfo,
997 boolean force_baseline));
998 EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl,
999 const unsigned int *basic_table,
1000 int scale_factor,
1001 boolean force_baseline));
1002 EXTERN(int) jpeg_quality_scaling JPP((int quality));
1003 EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo));
1004 EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo,
1059 EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo,
1060 JSAMPIMAGE data,
1061 JDIMENSION max_lines));
1062
1063 /* Additional entry points for buffered-image mode. */
1064 EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo));
1065 EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo,
1066 int scan_number));
1067 EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo));
1068 EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo));
1069 EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo));
1070 EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo));
1071 /* Return value is one of: */
1072 /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */
1073 #define JPEG_REACHED_SOS 1 /* Reached start of new scan */
1074 #define JPEG_REACHED_EOI 2 /* Reached end of image */
1075 #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */
1076 #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */
1077
1078 /* Precalculate output dimensions for current decompression parameters. */
1079 EXTERN(void) jpeg_core_output_dimensions JPP((j_decompress_ptr cinfo));
1080 EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo));
1081
1082 /* Control saving of COM and APPn markers into marker_list. */
1083 EXTERN(void) jpeg_save_markers
1084 JPP((j_decompress_ptr cinfo, int marker_code,
1085 unsigned int length_limit));
1086
1087 /* Install a special processing method for COM or APPn markers. */
1088 EXTERN(void) jpeg_set_marker_processor
1089 JPP((j_decompress_ptr cinfo, int marker_code,
1090 jpeg_marker_parser_method routine));
1091
1092 /* Read or write raw DCT coefficients --- useful for lossless transcoding. */
1093 EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo));
1094 EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo,
1095 jvirt_barray_ptr * coef_arrays));
1096 EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo,
1097 j_compress_ptr dstinfo));
1098
1099 /* If you choose to abort compression or decompression before completing
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