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.
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.
21 * First we include the configuration files that record how this
22 * installation of the JPEG library is set up. jconfig.h can be
23 * generated automatically for many systems. jmorecfg.h contains
24 * manual configuration options that most people need not worry about.
27 #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */
28 #include "jconfig.h" /* widely used configuration options */
30 #include "jmorecfg.h" /* seldom changed options */
34 #endif /* __cplusplus */
36 /* Version ID for the JPEG library.
37 * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60".
40 #define JPEG_LIB_VERSION 62 /* Version 6b */
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.
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.
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 */
68 /* Data structures for images (arrays of samples and of DCT coefficients).
69 * On 80x86 machines, the image arrays are too big for near pointers,
70 * but the pointer arrays can fit in near memory.
73 typedef JSAMPLE FAR
*JSAMPROW
; /* ptr to one image row of pixel samples. */
74 typedef JSAMPROW
*JSAMPARRAY
; /* ptr to some rows (a 2-D sample array) */
75 typedef JSAMPARRAY
*JSAMPIMAGE
; /* a 3-D sample array: top index is color */
77 typedef JCOEF JBLOCK
[DCTSIZE2
]; /* one block of coefficients */
78 typedef JBLOCK FAR
*JBLOCKROW
; /* pointer to one row of coefficient blocks */
79 typedef JBLOCKROW
*JBLOCKARRAY
; /* a 2-D array of coefficient blocks */
80 typedef JBLOCKARRAY
*JBLOCKIMAGE
; /* a 3-D array of coefficient blocks */
82 typedef JCOEF FAR
*JCOEFPTR
; /* useful in a couple of places */
85 /* Types for JPEG compression parameters and working tables. */
88 /* DCT coefficient quantization tables. */
91 /* This array gives the coefficient quantizers in natural array order
92 * (not the zigzag order in which they are stored in a JPEG DQT marker).
93 * CAUTION: IJG versions prior to v6a kept this array in zigzag order.
95 UINT16 quantval
[DCTSIZE2
]; /* quantization step for each coefficient */
96 /* This field is used only during compression. It's initialized FALSE when
97 * the table is created, and set TRUE when it's been output to the file.
98 * You could suppress output of a table by setting this to TRUE.
99 * (See jpeg_suppress_tables for an example.)
101 boolean sent_table
; /* TRUE when table has been output */
105 /* Huffman coding tables. */
108 /* These two fields directly represent the contents of a JPEG DHT marker */
109 UINT8 bits
[17]; /* bits[k] = # of symbols with codes of */
110 /* length k bits; bits[0] is unused */
111 UINT8 huffval
[256]; /* The symbols, in order of incr code length */
112 /* This field is used only during compression. It's initialized FALSE when
113 * the table is created, and set TRUE when it's been output to the file.
114 * You could suppress output of a table by setting this to TRUE.
115 * (See jpeg_suppress_tables for an example.)
117 boolean sent_table
; /* TRUE when table has been output */
121 /* Basic info about one component (color channel). */
124 /* These values are fixed over the whole image. */
125 /* For compression, they must be supplied by parameter setup; */
126 /* for decompression, they are read from the SOF marker. */
127 int component_id
; /* identifier for this component (0..255) */
128 int component_index
; /* its index in SOF or cinfo->comp_info[] */
129 int h_samp_factor
; /* horizontal sampling factor (1..4) */
130 int v_samp_factor
; /* vertical sampling factor (1..4) */
131 int quant_tbl_no
; /* quantization table selector (0..3) */
132 /* These values may vary between scans. */
133 /* For compression, they must be supplied by parameter setup; */
134 /* for decompression, they are read from the SOS marker. */
135 /* The decompressor output side may not use these variables. */
136 int dc_tbl_no
; /* DC entropy table selector (0..3) */
137 int ac_tbl_no
; /* AC entropy table selector (0..3) */
139 /* Remaining fields should be treated as private by applications. */
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.
146 JDIMENSION width_in_blocks
;
147 JDIMENSION height_in_blocks
;
148 /* Size of a DCT block in samples. Always DCTSIZE for compression.
149 * For decompression this is the size of the output from one DCT block,
150 * reflecting any scaling we choose to apply during the IDCT step.
151 * Values of 1,2,4,8 are likely to be supported. Note that different
152 * components may receive different IDCT scalings.
155 /* The downsampled dimensions are the component's actual, unpadded number
156 * of samples at the main buffer (preprocessing/compression interface), thus
157 * downsampled_width = ceil(image_width * Hi/Hmax)
158 * and similarly for height. For decompression, IDCT scaling is included, so
159 * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE)
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.
167 boolean component_needed
; /* do we need the value of this component? */
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 */
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.
182 JQUANT_TBL
* quant_table
;
184 /* Private per-component storage for DCT or IDCT subsystem. */
186 } jpeg_component_info
;
189 /* The script for encoding a multiple-scan file is an array of these: */
192 int comps_in_scan
; /* number of components encoded in this scan */
193 int component_index
[MAX_COMPS_IN_SCAN
]; /* their SOF/comp_info[] indexes */
194 int Ss
, Se
; /* progressive JPEG spectral selection parms */
195 int Ah
, Al
; /* progressive JPEG successive approx. parms */
198 /* The decompressor can save APPn and COM markers in a list of these: */
200 typedef struct jpeg_marker_struct FAR
* jpeg_saved_marker_ptr
;
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 */
211 /* Known color spaces. */
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 */
222 /* DCT/IDCT algorithm options. */
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 */
230 #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */
231 #define JDCT_DEFAULT JDCT_ISLOW
233 #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */
234 #define JDCT_FASTEST JDCT_IFAST
237 /* Dithering options for decompression. */
240 JDITHER_NONE
, /* no dithering */
241 JDITHER_ORDERED
, /* simple ordered dither */
242 JDITHER_FS
/* Floyd-Steinberg error diffusion dither */
246 /* Common fields between JPEG compression and decompression master structs. */
248 #define jpeg_common_fields \
249 struct jpeg_error_mgr * err; /* Error handler module */\
250 struct jpeg_memory_mgr * mem; /* Memory manager module */\
251 struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\
252 void * client_data; /* Available for use by application */\
253 boolean is_decompressor; /* So common code can tell which is which */\
254 int global_state /* For checking call sequence validity */
256 /* Routines that are to be used by both halves of the library are declared
257 * to receive a pointer to this structure. There are no actual instances of
258 * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
260 struct jpeg_common_struct
{
261 jpeg_common_fields
; /* Fields common to both master struct types */
262 /* Additional fields follow in an actual jpeg_compress_struct or
263 * jpeg_decompress_struct. All three structs must agree on these
264 * initial fields! (This would be a lot cleaner in C++.)
268 typedef struct jpeg_common_struct
* j_common_ptr
;
269 typedef struct jpeg_compress_struct
* j_compress_ptr
;
270 typedef struct jpeg_decompress_struct
* j_decompress_ptr
;
273 /* Master record for a compression instance */
275 struct jpeg_compress_struct
{
276 jpeg_common_fields
; /* Fields shared with jpeg_decompress_struct */
278 /* Destination for compressed data */
279 struct jpeg_destination_mgr
* dest
;
281 /* Description of source image --- these fields must be filled in by
282 * outer application before starting compression. in_color_space must
283 * be correct before you can even call jpeg_set_defaults().
286 JDIMENSION image_width
; /* input image width */
287 JDIMENSION image_height
; /* input image height */
288 int input_components
; /* # of color components in input image */
289 J_COLOR_SPACE in_color_space
; /* colorspace of input image */
291 double input_gamma
; /* image gamma of input image */
293 /* Compression parameters --- these fields must be set before calling
294 * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to
295 * initialize everything to reasonable defaults, then changing anything
296 * the application specifically wants to change. That way you won't get
297 * burnt when new parameters are added. Also note that there are several
298 * helper routines to simplify changing parameters.
301 int data_precision
; /* bits of precision in image data */
303 int num_components
; /* # of color components in JPEG image */
304 J_COLOR_SPACE jpeg_color_space
; /* colorspace of JPEG image */
306 jpeg_component_info
* comp_info
;
307 /* comp_info[i] describes component that appears i'th in SOF */
309 JQUANT_TBL
* quant_tbl_ptrs
[NUM_QUANT_TBLS
];
310 /* ptrs to coefficient quantization tables, or NULL if not defined */
312 JHUFF_TBL
* dc_huff_tbl_ptrs
[NUM_HUFF_TBLS
];
313 JHUFF_TBL
* ac_huff_tbl_ptrs
[NUM_HUFF_TBLS
];
314 /* ptrs to Huffman coding tables, or NULL if not defined */
316 UINT8 arith_dc_L
[NUM_ARITH_TBLS
]; /* L values for DC arith-coding tables */
317 UINT8 arith_dc_U
[NUM_ARITH_TBLS
]; /* U values for DC arith-coding tables */
318 UINT8 arith_ac_K
[NUM_ARITH_TBLS
]; /* Kx values for AC arith-coding tables */
320 int num_scans
; /* # of entries in scan_info array */
321 const jpeg_scan_info
* scan_info
; /* script for multi-scan file, or NULL */
322 /* The default value of scan_info is NULL, which causes a single-scan
323 * sequential JPEG file to be emitted. To create a multi-scan file,
324 * set num_scans and scan_info to point to an array of scan definitions.
327 boolean raw_data_in
; /* TRUE=caller supplies downsampled data */
328 boolean arith_code
; /* TRUE=arithmetic coding, FALSE=Huffman */
329 boolean optimize_coding
; /* TRUE=optimize entropy encoding parms */
330 boolean CCIR601_sampling
; /* TRUE=first samples are cosited */
331 int smoothing_factor
; /* 1..100, or 0 for no input smoothing */
332 J_DCT_METHOD dct_method
; /* DCT algorithm selector */
334 /* The restart interval can be specified in absolute MCUs by setting
335 * restart_interval, or in MCU rows by setting restart_in_rows
336 * (in which case the correct restart_interval will be figured
339 unsigned int restart_interval
; /* MCUs per restart, or 0 for no restart */
340 int restart_in_rows
; /* if > 0, MCU rows per restart interval */
342 /* Parameters controlling emission of special markers. */
344 boolean write_JFIF_header
; /* should a JFIF marker be written? */
345 UINT8 JFIF_major_version
; /* What to write for the JFIF version number */
346 UINT8 JFIF_minor_version
;
347 /* These three values are not used by the JPEG code, merely copied */
348 /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */
349 /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */
350 /* ratio is defined by X_density/Y_density even when density_unit=0. */
351 UINT8 density_unit
; /* JFIF code for pixel size units */
352 UINT16 X_density
; /* Horizontal pixel density */
353 UINT16 Y_density
; /* Vertical pixel density */
354 boolean write_Adobe_marker
; /* should an Adobe marker be written? */
356 /* State variable: index of next scanline to be written to
357 * jpeg_write_scanlines(). Application may use this to control its
358 * processing loop, e.g., "while (next_scanline < image_height)".
361 JDIMENSION next_scanline
; /* 0 .. image_height-1 */
363 /* Remaining fields are known throughout compressor, but generally
364 * should not be touched by a surrounding application.
368 * These fields are computed during compression startup
370 boolean progressive_mode
; /* TRUE if scan script uses progressive mode */
371 int max_h_samp_factor
; /* largest h_samp_factor */
372 int max_v_samp_factor
; /* largest v_samp_factor */
374 JDIMENSION total_iMCU_rows
; /* # of iMCU rows to be input to coef ctlr */
375 /* The coefficient controller receives data in units of MCU rows as defined
376 * for fully interleaved scans (whether the JPEG file is interleaved or not).
377 * There are v_samp_factor * DCTSIZE sample rows of each component in an
378 * "iMCU" (interleaved MCU) row.
382 * These fields are valid during any one scan.
383 * They describe the components and MCUs actually appearing in the scan.
385 int comps_in_scan
; /* # of JPEG components in this scan */
386 jpeg_component_info
* cur_comp_info
[MAX_COMPS_IN_SCAN
];
387 /* *cur_comp_info[i] describes component that appears i'th in SOS */
389 JDIMENSION MCUs_per_row
; /* # of MCUs across the image */
390 JDIMENSION MCU_rows_in_scan
; /* # of MCU rows in the image */
392 int blocks_in_MCU
; /* # of DCT blocks per MCU */
393 int MCU_membership
[C_MAX_BLOCKS_IN_MCU
];
394 /* MCU_membership[i] is index in cur_comp_info of component owning */
395 /* i'th block in an MCU */
397 int Ss
, Se
, Ah
, Al
; /* progressive JPEG parameters for scan */
400 * Links to compression subobjects (methods and private variables of modules)
402 struct jpeg_comp_master
* master
;
403 struct jpeg_c_main_controller
* main
;
404 struct jpeg_c_prep_controller
* prep
;
405 struct jpeg_c_coef_controller
* coef
;
406 struct jpeg_marker_writer
* marker
;
407 struct jpeg_color_converter
* cconvert
;
408 struct jpeg_downsampler
* downsample
;
409 struct jpeg_forward_dct
* fdct
;
410 struct jpeg_entropy_encoder
* entropy
;
411 jpeg_scan_info
* script_space
; /* workspace for jpeg_simple_progression */
412 int script_space_size
;
416 /* Master record for a decompression instance */
418 struct jpeg_decompress_struct
{
419 jpeg_common_fields
; /* Fields shared with jpeg_compress_struct */
421 /* Source of compressed data */
422 struct jpeg_source_mgr
* src
;
424 /* Basic description of image --- filled in by jpeg_read_header(). */
425 /* Application may inspect these values to decide how to process image. */
427 JDIMENSION image_width
; /* nominal image width (from SOF marker) */
428 JDIMENSION image_height
; /* nominal image height */
429 int num_components
; /* # of color components in JPEG image */
430 J_COLOR_SPACE jpeg_color_space
; /* colorspace of JPEG image */
432 /* Decompression processing parameters --- these fields must be set before
433 * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes
434 * them to default values.
437 J_COLOR_SPACE out_color_space
; /* colorspace for output */
439 unsigned int scale_num
, scale_denom
; /* fraction by which to scale image */
441 double output_gamma
; /* image gamma wanted in output */
443 boolean buffered_image
; /* TRUE=multiple output passes */
444 boolean raw_data_out
; /* TRUE=downsampled data wanted */
446 J_DCT_METHOD dct_method
; /* IDCT algorithm selector */
447 boolean do_fancy_upsampling
; /* TRUE=apply fancy upsampling */
448 boolean do_block_smoothing
; /* TRUE=apply interblock smoothing */
450 boolean quantize_colors
; /* TRUE=colormapped output wanted */
451 /* the following are ignored if not quantize_colors: */
452 J_DITHER_MODE dither_mode
; /* type of color dithering to use */
453 boolean two_pass_quantize
; /* TRUE=use two-pass color quantization */
454 int desired_number_of_colors
; /* max # colors to use in created colormap */
455 /* these are significant only in buffered-image mode: */
456 boolean enable_1pass_quant
; /* enable future use of 1-pass quantizer */
457 boolean enable_external_quant
;/* enable future use of external colormap */
458 boolean enable_2pass_quant
; /* enable future use of 2-pass quantizer */
460 /* Description of actual output image that will be returned to application.
461 * These fields are computed by jpeg_start_decompress().
462 * You can also use jpeg_calc_output_dimensions() to determine these values
463 * in advance of calling jpeg_start_decompress().
466 JDIMENSION output_width
; /* scaled image width */
467 JDIMENSION output_height
; /* scaled image height */
468 int out_color_components
; /* # of color components in out_color_space */
469 int output_components
; /* # of color components returned */
470 /* output_components is 1 (a colormap index) when quantizing colors;
471 * otherwise it equals out_color_components.
473 int rec_outbuf_height
; /* min recommended height of scanline buffer */
474 /* If the buffer passed to jpeg_read_scanlines() is less than this many rows
475 * high, space and time will be wasted due to unnecessary data copying.
476 * Usually rec_outbuf_height will be 1 or 2, at most 4.
479 /* When quantizing colors, the output colormap is described by these fields.
480 * The application can supply a colormap by setting colormap non-NULL before
481 * calling jpeg_start_decompress; otherwise a colormap is created during
482 * jpeg_start_decompress or jpeg_start_output.
483 * The map has out_color_components rows and actual_number_of_colors columns.
485 int actual_number_of_colors
; /* number of entries in use */
486 JSAMPARRAY colormap
; /* The color map as a 2-D pixel array */
488 /* State variables: these variables indicate the progress of decompression.
489 * The application may examine these but must not modify them.
492 /* Row index of next scanline to be read from jpeg_read_scanlines().
493 * Application may use this to control its processing loop, e.g.,
494 * "while (output_scanline < output_height)".
496 JDIMENSION output_scanline
; /* 0 .. output_height-1 */
498 /* Current input scan number and number of iMCU rows completed in scan.
499 * These indicate the progress of the decompressor input side.
501 int input_scan_number
; /* Number of SOS markers seen so far */
502 JDIMENSION input_iMCU_row
; /* Number of iMCU rows completed */
504 /* The "output scan number" is the notional scan being displayed by the
505 * output side. The decompressor will not allow output scan/row number
506 * to get ahead of input scan/row, but it can fall arbitrarily far behind.
508 int output_scan_number
; /* Nominal scan number being displayed */
509 JDIMENSION output_iMCU_row
; /* Number of iMCU rows read */
511 /* Current progression status. coef_bits[c][i] indicates the precision
512 * with which component c's DCT coefficient i (in zigzag order) is known.
513 * It is -1 when no data has yet been received, otherwise it is the point
514 * transform (shift) value for the most recent scan of the coefficient
515 * (thus, 0 at completion of the progression).
516 * This pointer is NULL when reading a non-progressive file.
518 int (*coef_bits
)[DCTSIZE2
]; /* -1 or current Al value for each coef */
520 /* Internal JPEG parameters --- the application usually need not look at
521 * these fields. Note that the decompressor output side may not use
522 * any parameters that can change between scans.
525 /* Quantization and Huffman tables are carried forward across input
526 * datastreams when processing abbreviated JPEG datastreams.
529 JQUANT_TBL
* quant_tbl_ptrs
[NUM_QUANT_TBLS
];
530 /* ptrs to coefficient quantization tables, or NULL if not defined */
532 JHUFF_TBL
* dc_huff_tbl_ptrs
[NUM_HUFF_TBLS
];
533 JHUFF_TBL
* ac_huff_tbl_ptrs
[NUM_HUFF_TBLS
];
534 /* ptrs to Huffman coding tables, or NULL if not defined */
536 /* These parameters are never carried across datastreams, since they
537 * are given in SOF/SOS markers or defined to be reset by SOI.
540 int data_precision
; /* bits of precision in image data */
542 jpeg_component_info
* comp_info
;
543 /* comp_info[i] describes component that appears i'th in SOF */
545 boolean progressive_mode
; /* TRUE if SOFn specifies progressive mode */
546 boolean arith_code
; /* TRUE=arithmetic coding, FALSE=Huffman */
548 UINT8 arith_dc_L
[NUM_ARITH_TBLS
]; /* L values for DC arith-coding tables */
549 UINT8 arith_dc_U
[NUM_ARITH_TBLS
]; /* U values for DC arith-coding tables */
550 UINT8 arith_ac_K
[NUM_ARITH_TBLS
]; /* Kx values for AC arith-coding tables */
552 unsigned int restart_interval
; /* MCUs per restart interval, or 0 for no restart */
554 /* These fields record data obtained from optional markers recognized by
557 boolean saw_JFIF_marker
; /* TRUE iff a JFIF APP0 marker was found */
558 /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
559 UINT8 JFIF_major_version
; /* JFIF version number */
560 UINT8 JFIF_minor_version
;
561 UINT8 density_unit
; /* JFIF code for pixel size units */
562 UINT16 X_density
; /* Horizontal pixel density */
563 UINT16 Y_density
; /* Vertical pixel density */
564 boolean saw_Adobe_marker
; /* TRUE iff an Adobe APP14 marker was found */
565 UINT8 Adobe_transform
; /* Color transform code from Adobe marker */
567 boolean CCIR601_sampling
; /* TRUE=first samples are cosited */
569 /* Aside from the specific data retained from APPn markers known to the
570 * library, the uninterpreted contents of any or all APPn and COM markers
571 * can be saved in a list for examination by the application.
573 jpeg_saved_marker_ptr marker_list
; /* Head of list of saved markers */
575 /* Remaining fields are known throughout decompressor, but generally
576 * should not be touched by a surrounding application.
580 * These fields are computed during decompression startup
582 int max_h_samp_factor
; /* largest h_samp_factor */
583 int max_v_samp_factor
; /* largest v_samp_factor */
585 int min_DCT_scaled_size
; /* smallest DCT_scaled_size of any component */
587 JDIMENSION total_iMCU_rows
; /* # of iMCU rows in image */
588 /* The coefficient controller's input and output progress is measured in
589 * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows
590 * in fully interleaved JPEG scans, but are used whether the scan is
591 * interleaved or not. We define an iMCU row as v_samp_factor DCT block
592 * rows of each component. Therefore, the IDCT output contains
593 * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row.
596 JSAMPLE
* sample_range_limit
; /* table for fast range-limiting */
599 * These fields are valid during any one scan.
600 * They describe the components and MCUs actually appearing in the scan.
601 * Note that the decompressor output side must not use these fields.
603 int comps_in_scan
; /* # of JPEG components in this scan */
604 jpeg_component_info
* cur_comp_info
[MAX_COMPS_IN_SCAN
];
605 /* *cur_comp_info[i] describes component that appears i'th in SOS */
607 JDIMENSION MCUs_per_row
; /* # of MCUs across the image */
608 JDIMENSION MCU_rows_in_scan
; /* # of MCU rows in the image */
610 int blocks_in_MCU
; /* # of DCT blocks per MCU */
611 int MCU_membership
[D_MAX_BLOCKS_IN_MCU
];
612 /* MCU_membership[i] is index in cur_comp_info of component owning */
613 /* i'th block in an MCU */
615 int Ss
, Se
, Ah
, Al
; /* progressive JPEG parameters for scan */
617 /* This field is shared between entropy decoder and marker parser.
618 * It is either zero or the code of a JPEG marker that has been
619 * read from the data source, but has not yet been processed.
624 * Links to decompression subobjects (methods, private variables of modules)
626 struct jpeg_decomp_master
* master
;
627 struct jpeg_d_main_controller
* main
;
628 struct jpeg_d_coef_controller
* coef
;
629 struct jpeg_d_post_controller
* post
;
630 struct jpeg_input_controller
* inputctl
;
631 struct jpeg_marker_reader
* marker
;
632 struct jpeg_entropy_decoder
* entropy
;
633 struct jpeg_inverse_dct
* idct
;
634 struct jpeg_upsampler
* upsample
;
635 struct jpeg_color_deconverter
* cconvert
;
636 struct jpeg_color_quantizer
* cquantize
;
640 /* "Object" declarations for JPEG modules that may be supplied or called
641 * directly by the surrounding application.
642 * As with all objects in the JPEG library, these structs only define the
643 * publicly visible methods and state variables of a module. Additional
644 * private fields may exist after the public ones.
648 /* Error handler object */
650 struct jpeg_error_mgr
{
651 /* Error exit handler: does not return to caller */
652 JMETHOD(void, error_exit
, (j_common_ptr cinfo
));
653 /* Conditionally emit a trace or warning message */
654 JMETHOD(void, emit_message
, (j_common_ptr cinfo
, int msg_level
));
655 /* Routine that actually outputs a trace or error message */
656 JMETHOD(void, output_message
, (j_common_ptr cinfo
));
657 /* Format a message string for the most recent JPEG error or message */
658 JMETHOD(void, format_message
, (j_common_ptr cinfo
, char * buffer
));
659 #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */
660 /* Reset error state variables at start of a new image */
661 JMETHOD(void, reset_error_mgr
, (j_common_ptr cinfo
));
663 /* The message ID code and any parameters are saved here.
664 * A message can have one string parameter or up to 8 int parameters.
667 #define JMSG_STR_PARM_MAX 80
670 char s
[JMSG_STR_PARM_MAX
];
673 /* Standard state variables for error facility */
675 int trace_level
; /* max msg_level that will be displayed */
677 /* For recoverable corrupt-data errors, we emit a warning message,
678 * but keep going unless emit_message chooses to abort. emit_message
679 * should count warnings in num_warnings. The surrounding application
680 * can check for bad data by seeing if num_warnings is nonzero at the
683 long num_warnings
; /* number of corrupt-data warnings */
685 /* These fields point to the table(s) of error message strings.
686 * An application can change the table pointer to switch to a different
687 * message list (typically, to change the language in which errors are
688 * reported). Some applications may wish to add additional error codes
689 * that will be handled by the JPEG library error mechanism; the second
690 * table pointer is used for this purpose.
692 * First table includes all errors generated by JPEG library itself.
693 * Error code 0 is reserved for a "no such error string" message.
695 const char * const * jpeg_message_table
; /* Library errors */
696 int last_jpeg_message
; /* Table contains strings 0..last_jpeg_message */
697 /* Second table can be added by application (see cjpeg/djpeg for example).
698 * It contains strings numbered first_addon_message..last_addon_message.
700 const char * const * addon_message_table
; /* Non-library errors */
701 int first_addon_message
; /* code for first string in addon table */
702 int last_addon_message
; /* code for last string in addon table */
706 /* Progress monitor object */
708 struct jpeg_progress_mgr
{
709 JMETHOD(void, progress_monitor
, (j_common_ptr cinfo
));
711 long pass_counter
; /* work units completed in this pass */
712 long pass_limit
; /* total number of work units in this pass */
713 int completed_passes
; /* passes completed so far */
714 int total_passes
; /* total number of passes expected */
718 /* Data destination object for compression */
720 struct jpeg_destination_mgr
{
721 JOCTET
* next_output_byte
; /* => next byte to write in buffer */
722 size_t free_in_buffer
; /* # of byte spaces remaining in buffer */
724 JMETHOD(void, init_destination
, (j_compress_ptr cinfo
));
725 JMETHOD(boolean
, empty_output_buffer
, (j_compress_ptr cinfo
));
726 JMETHOD(void, term_destination
, (j_compress_ptr cinfo
));
730 /* Data source object for decompression */
732 struct jpeg_source_mgr
{
733 const JOCTET
* next_input_byte
; /* => next byte to read from buffer */
734 size_t bytes_in_buffer
; /* # of bytes remaining in buffer */
736 JMETHOD(void, init_source
, (j_decompress_ptr cinfo
));
737 JMETHOD(boolean
, fill_input_buffer
, (j_decompress_ptr cinfo
));
738 JMETHOD(void, skip_input_data
, (j_decompress_ptr cinfo
, long num_bytes
));
739 JMETHOD(boolean
, resync_to_restart
, (j_decompress_ptr cinfo
, int desired
));
740 JMETHOD(void, term_source
, (j_decompress_ptr cinfo
));
744 /* Memory manager object.
745 * Allocates "small" objects (a few K total), "large" objects (tens of K),
746 * and "really big" objects (virtual arrays with backing store if needed).
747 * The memory manager does not allow individual objects to be freed; rather,
748 * each created object is assigned to a pool, and whole pools can be freed
749 * at once. This is faster and more convenient than remembering exactly what
750 * to free, especially where malloc()/free() are not too speedy.
751 * NB: alloc routines never return NULL. They exit to error_exit if not
755 #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */
756 #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */
757 #define JPOOL_NUMPOOLS 2
759 typedef struct jvirt_sarray_control
* jvirt_sarray_ptr
;
760 typedef struct jvirt_barray_control
* jvirt_barray_ptr
;
763 struct jpeg_memory_mgr
{
764 /* Method pointers */
765 JMETHOD(void *, alloc_small
, (j_common_ptr cinfo
, int pool_id
,
766 size_t sizeofobject
));
767 JMETHOD(void FAR
*, alloc_large
, (j_common_ptr cinfo
, int pool_id
,
768 size_t sizeofobject
));
769 JMETHOD(JSAMPARRAY
, alloc_sarray
, (j_common_ptr cinfo
, int pool_id
,
770 JDIMENSION samplesperrow
,
771 JDIMENSION numrows
));
772 JMETHOD(JBLOCKARRAY
, alloc_barray
, (j_common_ptr cinfo
, int pool_id
,
773 JDIMENSION blocksperrow
,
774 JDIMENSION numrows
));
775 JMETHOD(jvirt_sarray_ptr
, request_virt_sarray
, (j_common_ptr cinfo
,
778 JDIMENSION samplesperrow
,
780 JDIMENSION maxaccess
));
781 JMETHOD(jvirt_barray_ptr
, request_virt_barray
, (j_common_ptr cinfo
,
784 JDIMENSION blocksperrow
,
786 JDIMENSION maxaccess
));
787 JMETHOD(void, realize_virt_arrays
, (j_common_ptr cinfo
));
788 JMETHOD(JSAMPARRAY
, access_virt_sarray
, (j_common_ptr cinfo
,
789 jvirt_sarray_ptr ptr
,
790 JDIMENSION start_row
,
793 JMETHOD(JBLOCKARRAY
, access_virt_barray
, (j_common_ptr cinfo
,
794 jvirt_barray_ptr ptr
,
795 JDIMENSION start_row
,
798 JMETHOD(void, free_pool
, (j_common_ptr cinfo
, int pool_id
));
799 JMETHOD(void, self_destruct
, (j_common_ptr cinfo
));
801 /* Limit on memory allocation for this JPEG object. (Note that this is
802 * merely advisory, not a guaranteed maximum; it only affects the space
803 * used for virtual-array buffers.) May be changed by outer application
804 * after creating the JPEG object.
806 long max_memory_to_use
;
808 /* Maximum allocation request accepted by alloc_large. */
809 long max_alloc_chunk
;
813 /* Routine signature for application-supplied marker processing methods.
814 * Need not pass marker code since it is stored in cinfo->unread_marker.
816 typedef JMETHOD(boolean
, jpeg_marker_parser_method
, (j_decompress_ptr cinfo
));
819 /* Declarations for routines called by application.
820 * The JPP macro hides prototype parameters from compilers that can't cope.
821 * Note JPP requires double parentheses.
824 #ifdef HAVE_PROTOTYPES
825 #define JPP(arglist) arglist
827 #define JPP(arglist) ()
831 /* Short forms of external names for systems with brain-damaged linkers.
832 * We shorten external names to be unique in the first six letters, which
833 * is good enough for all known systems.
834 * (If your compiler itself needs names to be unique in less than 15
835 * characters, you are out of luck. Get a better compiler.)
838 #ifdef NEED_SHORT_EXTERNAL_NAMES
839 #define jpeg_std_error jStdError
840 #define jpeg_CreateCompress jCreaCompress
841 #define jpeg_CreateDecompress jCreaDecompress
842 #define jpeg_destroy_compress jDestCompress
843 #define jpeg_destroy_decompress jDestDecompress
844 #define jpeg_stdio_dest jStdDest
845 #define jpeg_stdio_src jStdSrc
846 #define jpeg_set_defaults jSetDefaults
847 #define jpeg_set_colorspace jSetColorspace
848 #define jpeg_default_colorspace jDefColorspace
849 #define jpeg_set_quality jSetQuality
850 #define jpeg_set_linear_quality jSetLQuality
851 #define jpeg_add_quant_table jAddQuantTable
852 #define jpeg_quality_scaling jQualityScaling
853 #define jpeg_simple_progression jSimProgress
854 #define jpeg_suppress_tables jSuppressTables
855 #define jpeg_alloc_quant_table jAlcQTable
856 #define jpeg_alloc_huff_table jAlcHTable
857 #define jpeg_start_compress jStrtCompress
858 #define jpeg_write_scanlines jWrtScanlines
859 #define jpeg_finish_compress jFinCompress
860 #define jpeg_write_raw_data jWrtRawData
861 #define jpeg_write_marker jWrtMarker
862 #define jpeg_write_m_header jWrtMHeader
863 #define jpeg_write_m_byte jWrtMByte
864 #define jpeg_write_tables jWrtTables
865 #define jpeg_read_header jReadHeader
866 #define jpeg_start_decompress jStrtDecompress
867 #define jpeg_read_scanlines jReadScanlines
868 #define jpeg_finish_decompress jFinDecompress
869 #define jpeg_read_raw_data jReadRawData
870 #define jpeg_has_multiple_scans jHasMultScn
871 #define jpeg_start_output jStrtOutput
872 #define jpeg_finish_output jFinOutput
873 #define jpeg_input_complete jInComplete
874 #define jpeg_new_colormap jNewCMap
875 #define jpeg_consume_input jConsumeInput
876 #define jpeg_calc_output_dimensions jCalcDimensions
877 #define jpeg_save_markers jSaveMarkers
878 #define jpeg_set_marker_processor jSetMarker
879 #define jpeg_read_coefficients jReadCoefs
880 #define jpeg_write_coefficients jWrtCoefs
881 #define jpeg_copy_critical_parameters jCopyCrit
882 #define jpeg_abort_compress jAbrtCompress
883 #define jpeg_abort_decompress jAbrtDecompress
884 #define jpeg_abort jAbort
885 #define jpeg_destroy jDestroy
886 #define jpeg_resync_to_restart jResyncRestart
887 #endif /* NEED_SHORT_EXTERNAL_NAMES */
890 /* Default error-management setup */
891 EXTERN(struct jpeg_error_mgr
*) jpeg_std_error
892 JPP((struct jpeg_error_mgr
* err
));
894 /* Initialization of JPEG compression objects.
895 * jpeg_create_compress() and jpeg_create_decompress() are the exported
896 * names that applications should call. These expand to calls on
897 * jpeg_CreateCompress and jpeg_CreateDecompress with additional information
898 * passed for version mismatch checking.
899 * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
901 #define jpeg_create_compress(cinfo) \
902 jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
903 (size_t) sizeof(struct jpeg_compress_struct))
904 #define jpeg_create_decompress(cinfo) \
905 jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
906 (size_t) sizeof(struct jpeg_decompress_struct))
907 EXTERN(void) jpeg_CreateCompress
JPP((j_compress_ptr cinfo
,
908 int version
, size_t structsize
));
909 EXTERN(void) jpeg_CreateDecompress
JPP((j_decompress_ptr cinfo
,
910 int version
, size_t structsize
));
911 /* Destruction of JPEG compression objects */
912 EXTERN(void) jpeg_destroy_compress
JPP((j_compress_ptr cinfo
));
913 EXTERN(void) jpeg_destroy_decompress
JPP((j_decompress_ptr cinfo
));
915 /* Standard data source and destination managers: stdio streams. */
916 /* Caller is responsible for opening the file before and closing after. */
917 EXTERN(void) jpeg_stdio_dest
JPP((j_compress_ptr cinfo
, FILE * outfile
));
918 EXTERN(void) jpeg_stdio_src
JPP((j_decompress_ptr cinfo
, FILE * infile
));
920 /* Default parameter setup for compression */
921 EXTERN(void) jpeg_set_defaults
JPP((j_compress_ptr cinfo
));
922 /* Compression parameter setup aids */
923 EXTERN(void) jpeg_set_colorspace
JPP((j_compress_ptr cinfo
,
924 J_COLOR_SPACE colorspace
));
925 EXTERN(void) jpeg_default_colorspace
JPP((j_compress_ptr cinfo
));
926 EXTERN(void) jpeg_set_quality
JPP((j_compress_ptr cinfo
, int quality
,
927 boolean force_baseline
));
928 EXTERN(void) jpeg_set_linear_quality
JPP((j_compress_ptr cinfo
,
930 boolean force_baseline
));
931 EXTERN(void) jpeg_add_quant_table
JPP((j_compress_ptr cinfo
, int which_tbl
,
932 const unsigned int *basic_table
,
934 boolean force_baseline
));
935 EXTERN(int) jpeg_quality_scaling
JPP((int quality
));
936 EXTERN(void) jpeg_simple_progression
JPP((j_compress_ptr cinfo
));
937 EXTERN(void) jpeg_suppress_tables
JPP((j_compress_ptr cinfo
,
939 EXTERN(JQUANT_TBL
*) jpeg_alloc_quant_table
JPP((j_common_ptr cinfo
));
940 EXTERN(JHUFF_TBL
*) jpeg_alloc_huff_table
JPP((j_common_ptr cinfo
));
942 /* Main entry points for compression */
943 EXTERN(void) jpeg_start_compress
JPP((j_compress_ptr cinfo
,
944 boolean write_all_tables
));
945 EXTERN(JDIMENSION
) jpeg_write_scanlines
JPP((j_compress_ptr cinfo
,
946 JSAMPARRAY scanlines
,
947 JDIMENSION num_lines
));
948 EXTERN(void) jpeg_finish_compress
JPP((j_compress_ptr cinfo
));
950 /* Replaces jpeg_write_scanlines when writing raw downsampled data. */
951 EXTERN(JDIMENSION
) jpeg_write_raw_data
JPP((j_compress_ptr cinfo
,
953 JDIMENSION num_lines
));
955 /* Write a special marker. See libjpeg.doc concerning safe usage. */
956 EXTERN(void) jpeg_write_marker
957 JPP((j_compress_ptr cinfo
, int marker
,
958 const JOCTET
* dataptr
, unsigned int datalen
));
959 /* Same, but piecemeal. */
960 EXTERN(void) jpeg_write_m_header
961 JPP((j_compress_ptr cinfo
, int marker
, unsigned int datalen
));
962 EXTERN(void) jpeg_write_m_byte
963 JPP((j_compress_ptr cinfo
, int val
));
965 /* Alternate compression function: just write an abbreviated table file */
966 EXTERN(void) jpeg_write_tables
JPP((j_compress_ptr cinfo
));
968 /* Decompression startup: read start of JPEG datastream to see what's there */
969 EXTERN(int) jpeg_read_header
JPP((j_decompress_ptr cinfo
,
970 boolean require_image
));
971 /* Return value is one of: */
972 #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */
973 #define JPEG_HEADER_OK 1 /* Found valid image datastream */
974 #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */
975 /* If you pass require_image = TRUE (normal case), you need not check for
976 * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
977 * JPEG_SUSPENDED is only possible if you use a data source module that can
978 * give a suspension return (the stdio source module doesn't).
981 /* Main entry points for decompression */
982 EXTERN(boolean
) jpeg_start_decompress
JPP((j_decompress_ptr cinfo
));
983 EXTERN(JDIMENSION
) jpeg_read_scanlines
JPP((j_decompress_ptr cinfo
,
984 JSAMPARRAY scanlines
,
985 JDIMENSION max_lines
));
986 EXTERN(boolean
) jpeg_finish_decompress
JPP((j_decompress_ptr cinfo
));
988 /* Replaces jpeg_read_scanlines when reading raw downsampled data. */
989 EXTERN(JDIMENSION
) jpeg_read_raw_data
JPP((j_decompress_ptr cinfo
,
991 JDIMENSION max_lines
));
993 /* Additional entry points for buffered-image mode. */
994 EXTERN(boolean
) jpeg_has_multiple_scans
JPP((j_decompress_ptr cinfo
));
995 EXTERN(boolean
) jpeg_start_output
JPP((j_decompress_ptr cinfo
,
997 EXTERN(boolean
) jpeg_finish_output
JPP((j_decompress_ptr cinfo
));
998 EXTERN(boolean
) jpeg_input_complete
JPP((j_decompress_ptr cinfo
));
999 EXTERN(void) jpeg_new_colormap
JPP((j_decompress_ptr cinfo
));
1000 EXTERN(int) jpeg_consume_input
JPP((j_decompress_ptr cinfo
));
1001 /* Return value is one of: */
1002 /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */
1003 #define JPEG_REACHED_SOS 1 /* Reached start of new scan */
1004 #define JPEG_REACHED_EOI 2 /* Reached end of image */
1005 #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */
1006 #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */
1008 /* Precalculate output dimensions for current decompression parameters. */
1009 EXTERN(void) jpeg_calc_output_dimensions
JPP((j_decompress_ptr cinfo
));
1011 /* Control saving of COM and APPn markers into marker_list. */
1012 EXTERN(void) jpeg_save_markers
1013 JPP((j_decompress_ptr cinfo
, int marker_code
,
1014 unsigned int length_limit
));
1016 /* Install a special processing method for COM or APPn markers. */
1017 EXTERN(void) jpeg_set_marker_processor
1018 JPP((j_decompress_ptr cinfo
, int marker_code
,
1019 jpeg_marker_parser_method routine
));
1021 /* Read or write raw DCT coefficients --- useful for lossless transcoding. */
1022 EXTERN(jvirt_barray_ptr
*) jpeg_read_coefficients
JPP((j_decompress_ptr cinfo
));
1023 EXTERN(void) jpeg_write_coefficients
JPP((j_compress_ptr cinfo
,
1024 jvirt_barray_ptr
* coef_arrays
));
1025 EXTERN(void) jpeg_copy_critical_parameters
JPP((j_decompress_ptr srcinfo
,
1026 j_compress_ptr dstinfo
));
1028 /* If you choose to abort compression or decompression before completing
1029 * jpeg_finish_(de)compress, then you need to clean up to release memory,
1030 * temporary files, etc. You can just call jpeg_destroy_(de)compress
1031 * if you're done with the JPEG object, but if you want to clean it up and
1032 * reuse it, call this:
1034 EXTERN(void) jpeg_abort_compress
JPP((j_compress_ptr cinfo
));
1035 EXTERN(void) jpeg_abort_decompress
JPP((j_decompress_ptr cinfo
));
1037 /* Generic versions of jpeg_abort and jpeg_destroy that work on either
1038 * flavor of JPEG object. These may be more convenient in some places.
1040 EXTERN(void) jpeg_abort
JPP((j_common_ptr cinfo
));
1041 EXTERN(void) jpeg_destroy
JPP((j_common_ptr cinfo
));
1043 /* Default restart-marker-resync procedure for use by data source modules */
1044 EXTERN(boolean
) jpeg_resync_to_restart
JPP((j_decompress_ptr cinfo
,
1048 /* These marker codes are exported since applications and data source modules
1049 * are likely to want to use them.
1052 #define JPEG_RST0 0xD0 /* RST0 marker code */
1053 #define JPEG_EOI 0xD9 /* EOI marker code */
1054 #define JPEG_APP0 0xE0 /* APP0 marker code */
1055 #define JPEG_COM 0xFE /* COM marker code */
1058 /* If we have a brain-damaged compiler that emits warnings (or worse, errors)
1059 * for structure definitions that are never filled in, keep it quiet by
1060 * supplying dummy definitions for the various substructures.
1063 #ifdef INCOMPLETE_TYPES_BROKEN
1064 #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */
1065 struct jvirt_sarray_control
{ long dummy
; };
1066 struct jvirt_barray_control
{ long dummy
; };
1067 struct jpeg_comp_master
{ long dummy
; };
1068 struct jpeg_c_main_controller
{ long dummy
; };
1069 struct jpeg_c_prep_controller
{ long dummy
; };
1070 struct jpeg_c_coef_controller
{ long dummy
; };
1071 struct jpeg_marker_writer
{ long dummy
; };
1072 struct jpeg_color_converter
{ long dummy
; };
1073 struct jpeg_downsampler
{ long dummy
; };
1074 struct jpeg_forward_dct
{ long dummy
; };
1075 struct jpeg_entropy_encoder
{ long dummy
; };
1076 struct jpeg_decomp_master
{ long dummy
; };
1077 struct jpeg_d_main_controller
{ long dummy
; };
1078 struct jpeg_d_coef_controller
{ long dummy
; };
1079 struct jpeg_d_post_controller
{ long dummy
; };
1080 struct jpeg_input_controller
{ long dummy
; };
1081 struct jpeg_marker_reader
{ long dummy
; };
1082 struct jpeg_entropy_decoder
{ long dummy
; };
1083 struct jpeg_inverse_dct
{ long dummy
; };
1084 struct jpeg_upsampler
{ long dummy
; };
1085 struct jpeg_color_deconverter
{ long dummy
; };
1086 struct jpeg_color_quantizer
{ long dummy
; };
1087 #endif /* JPEG_INTERNALS */
1088 #endif /* INCOMPLETE_TYPES_BROKEN */
1095 * The JPEG library modules define JPEG_INTERNALS before including this file.
1096 * The internal structure declarations are read only when that is true.
1097 * Applications using the library should not include jpegint.h, but may wish
1098 * to include jerror.h.
1101 #ifdef JPEG_INTERNALS
1102 #include "jpegint.h" /* fetch private declarations */
1103 #include "jerror.h" /* fetch error codes too */
1110 #endif /* JPEGLIB_H */