4 * This file was part of the Independent JPEG Group's software:
5 * Copyright (C) 1991-1998, Thomas G. Lane.
6 * Modified 2002-2009 by Guido Vollbeding.
7 * libjpeg-turbo Modifications:
8 * Copyright (C) 2009-2011, 2013-2014, 2016-2017, D. R. Commander.
9 * Copyright (C) 2015, Google, Inc.
10 * For conditions of distribution and use, see the accompanying README.ijg
13 * This file defines the application interface for the JPEG library.
14 * Most applications using the library need only include this file,
15 * and perhaps jerror.h if they want to know the exact error codes.
22 * First we include the configuration files that record how this
23 * installation of the JPEG library is set up. jconfig.h can be
24 * generated automatically for many systems. jmorecfg.h contains
25 * manual configuration options that most people need not worry about.
28 #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */
29 #include "jconfig.h" /* widely used configuration options */
31 #include "jmorecfg.h" /* seldom changed options */
35 #ifndef DONT_USE_EXTERN_C
41 /* Various constants determining the sizes of things.
42 * All of these are specified by the JPEG standard, so don't change them
43 * if you want to be compatible.
46 #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */
47 #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */
48 #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */
49 #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */
50 #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */
51 #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */
52 #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */
53 /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
54 * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
55 * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
56 * to handle it. We even let you do this from the jconfig.h file. However,
57 * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
58 * sometimes emits noncompliant files doesn't mean you should too.
60 #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */
61 #ifndef D_MAX_BLOCKS_IN_MCU
62 #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */
66 /* Data structures for images (arrays of samples and of DCT coefficients).
69 typedef JSAMPLE *JSAMPROW; /* ptr to one image row of pixel samples. */
70 typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */
71 typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */
73 typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */
74 typedef JBLOCK *JBLOCKROW; /* pointer to one row of coefficient blocks */
75 typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */
76 typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */
78 typedef JCOEF *JCOEFPTR; /* useful in a couple of places */
81 /* Types for JPEG compression parameters and working tables. */
84 /* DCT coefficient quantization tables. */
87 /* This array gives the coefficient quantizers in natural array order
88 * (not the zigzag order in which they are stored in a JPEG DQT marker).
89 * CAUTION: IJG versions prior to v6a kept this array in zigzag order.
91 UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */
92 /* This field is used only during compression. It's initialized FALSE when
93 * the table is created, and set TRUE when it's been output to the file.
94 * You could suppress output of a table by setting this to TRUE.
95 * (See jpeg_suppress_tables for an example.)
97 boolean sent_table; /* TRUE when table has been output */
101 /* Huffman coding tables. */
104 /* These two fields directly represent the contents of a JPEG DHT marker */
105 UINT8 bits[17]; /* bits[k] = # of symbols with codes of */
106 /* length k bits; bits[0] is unused */
107 UINT8 huffval[256]; /* The symbols, in order of incr code length */
108 /* This field is used only during compression. It's initialized FALSE when
109 * the table is created, and set TRUE when it's been output to the file.
110 * You could suppress output of a table by setting this to TRUE.
111 * (See jpeg_suppress_tables for an example.)
113 boolean sent_table; /* TRUE when table has been output */
117 /* Basic info about one component (color channel). */
120 /* These values are fixed over the whole image. */
121 /* For compression, they must be supplied by parameter setup; */
122 /* for decompression, they are read from the SOF marker. */
123 int component_id; /* identifier for this component (0..255) */
124 int component_index; /* its index in SOF or cinfo->comp_info[] */
125 int h_samp_factor; /* horizontal sampling factor (1..4) */
126 int v_samp_factor; /* vertical sampling factor (1..4) */
127 int quant_tbl_no; /* quantization table selector (0..3) */
128 /* These values may vary between scans. */
129 /* For compression, they must be supplied by parameter setup; */
130 /* for decompression, they are read from the SOS marker. */
131 /* The decompressor output side may not use these variables. */
132 int dc_tbl_no; /* DC entropy table selector (0..3) */
133 int ac_tbl_no; /* AC entropy table selector (0..3) */
135 /* Remaining fields should be treated as private by applications. */
137 /* These values are computed during compression or decompression startup: */
138 /* Component's size in DCT blocks.
139 * Any dummy blocks added to complete an MCU are not counted; therefore
140 * these values do not depend on whether a scan is interleaved or not.
142 JDIMENSION width_in_blocks;
143 JDIMENSION height_in_blocks;
144 /* Size of a DCT block in samples. Always DCTSIZE for compression.
145 * For decompression this is the size of the output from one DCT block,
146 * reflecting any scaling we choose to apply during the IDCT step.
147 * Values from 1 to 16 are supported.
148 * Note that different components may receive different IDCT scalings.
150 #if JPEG_LIB_VERSION >= 70
151 int DCT_h_scaled_size;
152 int DCT_v_scaled_size;
156 /* The downsampled dimensions are the component's actual, unpadded number
157 * of samples at the main buffer (preprocessing/compression interface), thus
158 * downsampled_width = ceil(image_width * Hi/Hmax)
159 * and similarly for height. For decompression, IDCT scaling is included, so
160 * downsampled_width = ceil(image_width * Hi/Hmax * DCT_[h_]scaled_size/DCTSIZE)
162 JDIMENSION downsampled_width; /* actual width in samples */
163 JDIMENSION downsampled_height; /* actual height in samples */
164 /* This flag is used only for decompression. In cases where some of the
165 * components will be ignored (eg grayscale output from YCbCr image),
166 * we can skip most computations for the unused components.
168 boolean component_needed; /* do we need the value of this component? */
170 /* These values are computed before starting a scan of the component. */
171 /* The decompressor output side may not use these variables. */
172 int MCU_width; /* number of blocks per MCU, horizontally */
173 int MCU_height; /* number of blocks per MCU, vertically */
174 int MCU_blocks; /* MCU_width * MCU_height */
175 int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_[h_]scaled_size */
176 int last_col_width; /* # of non-dummy blocks across in last MCU */
177 int last_row_height; /* # of non-dummy blocks down in last MCU */
179 /* Saved quantization table for component; NULL if none yet saved.
180 * See jdinput.c comments about the need for this information.
181 * This field is currently used only for decompression.
183 JQUANT_TBL *quant_table;
185 /* Private per-component storage for DCT or IDCT subsystem. */
187 } jpeg_component_info;
190 /* The script for encoding a multiple-scan file is an array of these: */
193 int comps_in_scan; /* number of components encoded in this scan */
194 int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */
195 int Ss, Se; /* progressive JPEG spectral selection parms */
196 int Ah, Al; /* progressive JPEG successive approx. parms */
199 /* The decompressor can save APPn and COM markers in a list of these: */
201 typedef struct jpeg_marker_struct *jpeg_saved_marker_ptr;
203 struct jpeg_marker_struct {
204 jpeg_saved_marker_ptr next; /* next in list, or NULL */
205 UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */
206 unsigned int original_length; /* # bytes of data in the file */
207 unsigned int data_length; /* # bytes of data saved at data[] */
208 JOCTET *data; /* the data contained in the marker */
209 /* the marker length word is not counted in data_length or original_length */
212 /* Known color spaces. */
214 #define JCS_EXTENSIONS 1
215 #define JCS_ALPHA_EXTENSIONS 1
218 JCS_UNKNOWN, /* error/unspecified */
219 JCS_GRAYSCALE, /* monochrome */
220 JCS_RGB, /* red/green/blue as specified by the RGB_RED,
221 RGB_GREEN, RGB_BLUE, and RGB_PIXELSIZE macros */
222 JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */
223 JCS_CMYK, /* C/M/Y/K */
224 JCS_YCCK, /* Y/Cb/Cr/K */
225 JCS_EXT_RGB, /* red/green/blue */
226 JCS_EXT_RGBX, /* red/green/blue/x */
227 JCS_EXT_BGR, /* blue/green/red */
228 JCS_EXT_BGRX, /* blue/green/red/x */
229 JCS_EXT_XBGR, /* x/blue/green/red */
230 JCS_EXT_XRGB, /* x/red/green/blue */
231 /* When out_color_space it set to JCS_EXT_RGBX, JCS_EXT_BGRX, JCS_EXT_XBGR,
232 or JCS_EXT_XRGB during decompression, the X byte is undefined, and in
233 order to ensure the best performance, libjpeg-turbo can set that byte to
234 whatever value it wishes. Use the following colorspace constants to
235 ensure that the X byte is set to 0xFF, so that it can be interpreted as an
236 opaque alpha channel. */
237 JCS_EXT_RGBA, /* red/green/blue/alpha */
238 JCS_EXT_BGRA, /* blue/green/red/alpha */
239 JCS_EXT_ABGR, /* alpha/blue/green/red */
240 JCS_EXT_ARGB, /* alpha/red/green/blue */
241 JCS_RGB565 /* 5-bit red/6-bit green/5-bit blue */
244 /* DCT/IDCT algorithm options. */
247 JDCT_ISLOW, /* slow but accurate integer algorithm */
248 JDCT_IFAST, /* faster, less accurate integer method */
249 JDCT_FLOAT /* floating-point: accurate, fast on fast HW */
252 #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */
253 #define JDCT_DEFAULT JDCT_ISLOW
255 #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */
256 #define JDCT_FASTEST JDCT_IFAST
259 /* Dithering options for decompression. */
262 JDITHER_NONE, /* no dithering */
263 JDITHER_ORDERED, /* simple ordered dither */
264 JDITHER_FS /* Floyd-Steinberg error diffusion dither */
268 /* Common fields between JPEG compression and decompression master structs. */
270 #define jpeg_common_fields \
271 struct jpeg_error_mgr *err; /* Error handler module */ \
272 struct jpeg_memory_mgr *mem; /* Memory manager module */ \
273 struct jpeg_progress_mgr *progress; /* Progress monitor, or NULL if none */ \
274 void *client_data; /* Available for use by application */ \
275 boolean is_decompressor; /* So common code can tell which is which */ \
276 int global_state /* For checking call sequence validity */
278 /* Routines that are to be used by both halves of the library are declared
279 * to receive a pointer to this structure. There are no actual instances of
280 * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
282 struct jpeg_common_struct {
283 jpeg_common_fields; /* Fields common to both master struct types */
284 /* Additional fields follow in an actual jpeg_compress_struct or
285 * jpeg_decompress_struct. All three structs must agree on these
286 * initial fields! (This would be a lot cleaner in C++.)
290 typedef struct jpeg_common_struct *j_common_ptr;
291 typedef struct jpeg_compress_struct *j_compress_ptr;
292 typedef struct jpeg_decompress_struct *j_decompress_ptr;
294 typedef struct _Pick_Color_
307 /* Master record for a compression instance */
309 struct jpeg_compress_struct {
310 jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */
312 /* Destination for compressed data */
313 struct jpeg_destination_mgr *dest;
315 /* Description of source image --- these fields must be filled in by
316 * outer application before starting compression. in_color_space must
317 * be correct before you can even call jpeg_set_defaults().
320 JDIMENSION image_width; /* input image width */
321 JDIMENSION image_height; /* input image height */
322 int input_components; /* # of color components in input image */
323 J_COLOR_SPACE in_color_space; /* colorspace of input image */
325 double input_gamma; /* image gamma of input image */
327 /* Compression parameters --- these fields must be set before calling
328 * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to
329 * initialize everything to reasonable defaults, then changing anything
330 * the application specifically wants to change. That way you won't get
331 * burnt when new parameters are added. Also note that there are several
332 * helper routines to simplify changing parameters.
335 #if JPEG_LIB_VERSION >= 70
336 unsigned int scale_num, scale_denom; /* fraction by which to scale image */
338 JDIMENSION jpeg_width; /* scaled JPEG image width */
339 JDIMENSION jpeg_height; /* scaled JPEG image height */
340 /* Dimensions of actual JPEG image that will be written to file,
341 * derived from input dimensions by scaling factors above.
342 * These fields are computed by jpeg_start_compress().
343 * You can also use jpeg_calc_jpeg_dimensions() to determine these values
344 * in advance of calling jpeg_start_compress().
348 int data_precision; /* bits of precision in image data */
350 int num_components; /* # of color components in JPEG image */
351 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
353 jpeg_component_info *comp_info;
354 /* comp_info[i] describes component that appears i'th in SOF */
356 JQUANT_TBL *quant_tbl_ptrs[NUM_QUANT_TBLS];
357 #if JPEG_LIB_VERSION >= 70
358 int q_scale_factor[NUM_QUANT_TBLS];
360 /* ptrs to coefficient quantization tables, or NULL if not defined,
361 * and corresponding scale factors (percentage, initialized 100).
364 JHUFF_TBL *dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
365 JHUFF_TBL *ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
366 /* ptrs to Huffman coding tables, or NULL if not defined */
368 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
369 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
370 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
372 int num_scans; /* # of entries in scan_info array */
373 const jpeg_scan_info *scan_info; /* script for multi-scan file, or NULL */
374 /* The default value of scan_info is NULL, which causes a single-scan
375 * sequential JPEG file to be emitted. To create a multi-scan file,
376 * set num_scans and scan_info to point to an array of scan definitions.
379 boolean raw_data_in; /* TRUE=caller supplies downsampled data */
380 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
381 boolean optimize_coding; /* TRUE=optimize entropy encoding parms */
382 boolean CCIR601_sampling; /* TRUE=first samples are cosited */
383 #if JPEG_LIB_VERSION >= 70
384 boolean do_fancy_downsampling; /* TRUE=apply fancy downsampling */
386 int smoothing_factor; /* 1..100, or 0 for no input smoothing */
387 J_DCT_METHOD dct_method; /* DCT algorithm selector */
389 /* The restart interval can be specified in absolute MCUs by setting
390 * restart_interval, or in MCU rows by setting restart_in_rows
391 * (in which case the correct restart_interval will be figured
394 unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */
395 int restart_in_rows; /* if > 0, MCU rows per restart interval */
397 /* Parameters controlling emission of special markers. */
399 boolean write_JFIF_header; /* should a JFIF marker be written? */
400 UINT8 JFIF_major_version; /* What to write for the JFIF version number */
401 UINT8 JFIF_minor_version;
402 /* These three values are not used by the JPEG code, merely copied */
403 /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */
404 /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */
405 /* ratio is defined by X_density/Y_density even when density_unit=0. */
406 UINT8 density_unit; /* JFIF code for pixel size units */
407 UINT16 X_density; /* Horizontal pixel density */
408 UINT16 Y_density; /* Vertical pixel density */
409 boolean write_Adobe_marker; /* should an Adobe marker be written? */
411 /* State variable: index of next scanline to be written to
412 * jpeg_write_scanlines(). Application may use this to control its
413 * processing loop, e.g., "while (next_scanline < image_height)".
416 JDIMENSION next_scanline; /* 0 .. image_height-1 */
418 /* Remaining fields are known throughout compressor, but generally
419 * should not be touched by a surrounding application.
423 * These fields are computed during compression startup
425 boolean progressive_mode; /* TRUE if scan script uses progressive mode */
426 int max_h_samp_factor; /* largest h_samp_factor */
427 int max_v_samp_factor; /* largest v_samp_factor */
429 #if JPEG_LIB_VERSION >= 70
430 int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
431 int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
434 JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */
435 /* The coefficient controller receives data in units of MCU rows as defined
436 * for fully interleaved scans (whether the JPEG file is interleaved or not).
437 * There are v_samp_factor * DCTSIZE sample rows of each component in an
438 * "iMCU" (interleaved MCU) row.
442 * These fields are valid during any one scan.
443 * They describe the components and MCUs actually appearing in the scan.
445 int comps_in_scan; /* # of JPEG components in this scan */
446 jpeg_component_info *cur_comp_info[MAX_COMPS_IN_SCAN];
447 /* *cur_comp_info[i] describes component that appears i'th in SOS */
449 JDIMENSION MCUs_per_row; /* # of MCUs across the image */
450 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
452 int blocks_in_MCU; /* # of DCT blocks per MCU */
453 int MCU_membership[C_MAX_BLOCKS_IN_MCU];
454 /* MCU_membership[i] is index in cur_comp_info of component owning */
455 /* i'th block in an MCU */
457 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
459 #if JPEG_LIB_VERSION >= 80
460 int block_size; /* the basic DCT block size: 1..16 */
461 const int *natural_order; /* natural-order position array */
462 int lim_Se; /* min( Se, DCTSIZE2-1 ) */
466 * Links to compression subobjects (methods and private variables of modules)
468 struct jpeg_comp_master *master;
469 struct jpeg_c_main_controller *main;
470 struct jpeg_c_prep_controller *prep;
471 struct jpeg_c_coef_controller *coef;
472 struct jpeg_marker_writer *marker;
473 struct jpeg_color_converter *cconvert;
474 struct jpeg_downsampler *downsample;
475 struct jpeg_forward_dct *fdct;
476 struct jpeg_entropy_encoder *entropy;
477 jpeg_scan_info *script_space; /* workspace for jpeg_simple_progression */
478 int script_space_size;
482 /* Master record for a decompression instance */
484 struct jpeg_decompress_struct {
485 jpeg_common_fields; /* Fields shared with jpeg_compress_struct */
487 /* Source of compressed data */
488 struct jpeg_source_mgr *src;
490 /* Basic description of image --- filled in by jpeg_read_header(). */
491 /* Application may inspect these values to decide how to process image. */
493 JDIMENSION image_width; /* nominal image width (from SOF marker) */
494 JDIMENSION image_height; /* nominal image height */
495 int num_components; /* # of color components in JPEG image */
496 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */
498 /* Decompression processing parameters --- these fields must be set before
499 * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes
500 * them to default values.
503 J_COLOR_SPACE out_color_space; /* colorspace for output */
505 unsigned int scale_num, scale_denom; /* fraction by which to scale image */
507 #ifdef COLOR_PICKER_ENABLE
508 unsigned int region_x, region_y, region_w, region_h; /* if region_w && region_h > 0, then use this region to decode. scale above is done prior to region select */
511 double output_gamma; /* image gamma wanted in output */
513 boolean buffered_image; /* TRUE=multiple output passes */
514 boolean raw_data_out; /* TRUE=downsampled data wanted */
516 J_DCT_METHOD dct_method; /* IDCT algorithm selector */
517 boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */
518 boolean do_block_smoothing; /* TRUE=apply interblock smoothing */
520 boolean quantize_colors; /* TRUE=colormapped output wanted */
521 /* the following are ignored if not quantize_colors: */
522 J_DITHER_MODE dither_mode; /* type of color dithering to use */
523 boolean two_pass_quantize; /* TRUE=use two-pass color quantization */
524 int desired_number_of_colors; /* max # colors to use in created colormap */
525 /* these are significant only in buffered-image mode: */
526 boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */
527 boolean enable_external_quant;/* enable future use of external colormap */
528 boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */
530 /* Description of actual output image that will be returned to application.
531 * These fields are computed by jpeg_start_decompress().
532 * You can also use jpeg_calc_output_dimensions() to determine these values
533 * in advance of calling jpeg_start_decompress().
536 JDIMENSION output_width; /* scaled image width */
537 JDIMENSION output_height; /* scaled image height */
538 int out_color_components; /* # of color components in out_color_space */
539 int output_components; /* # of color components returned */
540 /* output_components is 1 (a colormap index) when quantizing colors;
541 * otherwise it equals out_color_components.
543 int rec_outbuf_height; /* min recommended height of scanline buffer */
544 /* If the buffer passed to jpeg_read_scanlines() is less than this many rows
545 * high, space and time will be wasted due to unnecessary data copying.
546 * Usually rec_outbuf_height will be 1 or 2, at most 4.
549 /* When quantizing colors, the output colormap is described by these fields.
550 * The application can supply a colormap by setting colormap non-NULL before
551 * calling jpeg_start_decompress; otherwise a colormap is created during
552 * jpeg_start_decompress or jpeg_start_output.
553 * The map has out_color_components rows and actual_number_of_colors columns.
555 int actual_number_of_colors; /* number of entries in use */
556 JSAMPARRAY colormap; /* The color map as a 2-D pixel array */
558 /* State variables: these variables indicate the progress of decompression.
559 * The application may examine these but must not modify them.
562 /* Row index of next scanline to be read from jpeg_read_scanlines().
563 * Application may use this to control its processing loop, e.g.,
564 * "while (output_scanline < output_height)".
566 JDIMENSION output_scanline; /* 0 .. output_height-1 */
568 /* Current input scan number and number of iMCU rows completed in scan.
569 * These indicate the progress of the decompressor input side.
571 int input_scan_number; /* Number of SOS markers seen so far */
572 JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */
574 /* The "output scan number" is the notional scan being displayed by the
575 * output side. The decompressor will not allow output scan/row number
576 * to get ahead of input scan/row, but it can fall arbitrarily far behind.
578 int output_scan_number; /* Nominal scan number being displayed */
579 JDIMENSION output_iMCU_row; /* Number of iMCU rows read */
581 /* Current progression status. coef_bits[c][i] indicates the precision
582 * with which component c's DCT coefficient i (in zigzag order) is known.
583 * It is -1 when no data has yet been received, otherwise it is the point
584 * transform (shift) value for the most recent scan of the coefficient
585 * (thus, 0 at completion of the progression).
586 * This pointer is NULL when reading a non-progressive file.
588 int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */
590 /* Internal JPEG parameters --- the application usually need not look at
591 * these fields. Note that the decompressor output side may not use
592 * any parameters that can change between scans.
595 /* Quantization and Huffman tables are carried forward across input
596 * datastreams when processing abbreviated JPEG datastreams.
599 JQUANT_TBL *quant_tbl_ptrs[NUM_QUANT_TBLS];
600 /* ptrs to coefficient quantization tables, or NULL if not defined */
602 JHUFF_TBL *dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
603 JHUFF_TBL *ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
604 /* ptrs to Huffman coding tables, or NULL if not defined */
606 /* These parameters are never carried across datastreams, since they
607 * are given in SOF/SOS markers or defined to be reset by SOI.
610 int data_precision; /* bits of precision in image data */
612 jpeg_component_info *comp_info;
613 /* comp_info[i] describes component that appears i'th in SOF */
615 #if JPEG_LIB_VERSION >= 80
616 boolean is_baseline; /* TRUE if Baseline SOF0 encountered */
618 boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */
619 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */
621 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */
622 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */
623 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */
625 unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */
627 /* These fields record data obtained from optional markers recognized by
630 boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */
631 /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
632 UINT8 JFIF_major_version; /* JFIF version number */
633 UINT8 JFIF_minor_version;
634 UINT8 density_unit; /* JFIF code for pixel size units */
635 UINT16 X_density; /* Horizontal pixel density */
636 UINT16 Y_density; /* Vertical pixel density */
637 boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */
638 UINT8 Adobe_transform; /* Color transform code from Adobe marker */
640 boolean CCIR601_sampling; /* TRUE=first samples are cosited */
642 /* Aside from the specific data retained from APPn markers known to the
643 * library, the uninterpreted contents of any or all APPn and COM markers
644 * can be saved in a list for examination by the application.
646 jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */
648 /* Remaining fields are known throughout decompressor, but generally
649 * should not be touched by a surrounding application.
653 * These fields are computed during decompression startup
655 int max_h_samp_factor; /* largest h_samp_factor */
656 int max_v_samp_factor; /* largest v_samp_factor */
658 #if JPEG_LIB_VERSION >= 70
659 int min_DCT_h_scaled_size; /* smallest DCT_h_scaled_size of any component */
660 int min_DCT_v_scaled_size; /* smallest DCT_v_scaled_size of any component */
662 int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */
665 JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */
666 /* The coefficient controller's input and output progress is measured in
667 * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows
668 * in fully interleaved JPEG scans, but are used whether the scan is
669 * interleaved or not. We define an iMCU row as v_samp_factor DCT block
670 * rows of each component. Therefore, the IDCT output contains
671 * v_samp_factor*DCT_[v_]scaled_size sample rows of a component per iMCU row.
674 JSAMPLE *sample_range_limit; /* table for fast range-limiting */
677 * These fields are valid during any one scan.
678 * They describe the components and MCUs actually appearing in the scan.
679 * Note that the decompressor output side must not use these fields.
681 int comps_in_scan; /* # of JPEG components in this scan */
682 jpeg_component_info *cur_comp_info[MAX_COMPS_IN_SCAN];
683 /* *cur_comp_info[i] describes component that appears i'th in SOS */
685 JDIMENSION MCUs_per_row; /* # of MCUs across the image */
686 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */
688 int blocks_in_MCU; /* # of DCT blocks per MCU */
689 int MCU_membership[D_MAX_BLOCKS_IN_MCU];
690 /* MCU_membership[i] is index in cur_comp_info of component owning */
691 /* i'th block in an MCU */
693 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */
695 #if JPEG_LIB_VERSION >= 80
696 /* These fields are derived from Se of first SOS marker.
698 int block_size; /* the basic DCT block size: 1..16 */
699 const int *natural_order; /* natural-order position array for entropy decode */
700 int lim_Se; /* min( Se, DCTSIZE2-1 ) for entropy decode */
703 /* This field is shared between entropy decoder and marker parser.
704 * It is either zero or the code of a JPEG marker that has been
705 * read from the data source, but has not yet been processed.
710 * Links to decompression subobjects (methods, private variables of modules)
712 struct jpeg_decomp_master *master;
713 struct jpeg_d_main_controller *main;
714 struct jpeg_d_coef_controller *coef;
715 struct jpeg_d_post_controller *post;
716 struct jpeg_input_controller *inputctl;
717 struct jpeg_marker_reader *marker;
718 struct jpeg_entropy_decoder *entropy;
719 struct jpeg_inverse_dct *idct;
720 struct jpeg_upsampler *upsample;
721 struct jpeg_color_deconverter *cconvert;
722 struct jpeg_color_quantizer *cquantize;
724 #ifdef COLOR_PICKER_ENABLE
725 struct _Pick_Color_ *pick_color_data;
730 /* "Object" declarations for JPEG modules that may be supplied or called
731 * directly by the surrounding application.
732 * As with all objects in the JPEG library, these structs only define the
733 * publicly visible methods and state variables of a module. Additional
734 * private fields may exist after the public ones.
738 /* Error handler object */
740 struct jpeg_error_mgr {
741 /* Error exit handler: does not return to caller */
742 void (*error_exit) (j_common_ptr cinfo);
743 /* Conditionally emit a trace or warning message */
744 void (*emit_message) (j_common_ptr cinfo, int msg_level);
745 /* Routine that actually outputs a trace or error message */
746 void (*output_message) (j_common_ptr cinfo);
747 /* Format a message string for the most recent JPEG error or message */
748 void (*format_message) (j_common_ptr cinfo, char *buffer);
749 #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */
750 /* Reset error state variables at start of a new image */
751 void (*reset_error_mgr) (j_common_ptr cinfo);
753 /* The message ID code and any parameters are saved here.
754 * A message can have one string parameter or up to 8 int parameters.
757 #define JMSG_STR_PARM_MAX 80
760 char s[JMSG_STR_PARM_MAX];
763 /* Standard state variables for error facility */
765 int trace_level; /* max msg_level that will be displayed */
767 /* For recoverable corrupt-data errors, we emit a warning message,
768 * but keep going unless emit_message chooses to abort. emit_message
769 * should count warnings in num_warnings. The surrounding application
770 * can check for bad data by seeing if num_warnings is nonzero at the
773 long num_warnings; /* number of corrupt-data warnings */
775 /* These fields point to the table(s) of error message strings.
776 * An application can change the table pointer to switch to a different
777 * message list (typically, to change the language in which errors are
778 * reported). Some applications may wish to add additional error codes
779 * that will be handled by the JPEG library error mechanism; the second
780 * table pointer is used for this purpose.
782 * First table includes all errors generated by JPEG library itself.
783 * Error code 0 is reserved for a "no such error string" message.
785 const char * const *jpeg_message_table; /* Library errors */
786 int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */
787 /* Second table can be added by application (see cjpeg/djpeg for example).
788 * It contains strings numbered first_addon_message..last_addon_message.
790 const char * const *addon_message_table; /* Non-library errors */
791 int first_addon_message; /* code for first string in addon table */
792 int last_addon_message; /* code for last string in addon table */
796 /* Progress monitor object */
798 struct jpeg_progress_mgr {
799 void (*progress_monitor) (j_common_ptr cinfo);
801 long pass_counter; /* work units completed in this pass */
802 long pass_limit; /* total number of work units in this pass */
803 int completed_passes; /* passes completed so far */
804 int total_passes; /* total number of passes expected */
808 /* Data destination object for compression */
810 struct jpeg_destination_mgr {
811 JOCTET *next_output_byte; /* => next byte to write in buffer */
812 size_t free_in_buffer; /* # of byte spaces remaining in buffer */
814 void (*init_destination) (j_compress_ptr cinfo);
815 boolean (*empty_output_buffer) (j_compress_ptr cinfo);
816 void (*term_destination) (j_compress_ptr cinfo);
820 /* Data source object for decompression */
822 struct jpeg_source_mgr {
823 const JOCTET *next_input_byte; /* => next byte to read from buffer */
824 size_t bytes_in_buffer; /* # of bytes remaining in buffer */
826 void (*init_source) (j_decompress_ptr cinfo);
827 boolean (*fill_input_buffer) (j_decompress_ptr cinfo);
828 void (*skip_input_data) (j_decompress_ptr cinfo, long num_bytes);
829 boolean (*resync_to_restart) (j_decompress_ptr cinfo, int desired);
830 void (*term_source) (j_decompress_ptr cinfo);
834 /* Memory manager object.
835 * Allocates "small" objects (a few K total), "large" objects (tens of K),
836 * and "really big" objects (virtual arrays with backing store if needed).
837 * The memory manager does not allow individual objects to be freed; rather,
838 * each created object is assigned to a pool, and whole pools can be freed
839 * at once. This is faster and more convenient than remembering exactly what
840 * to free, especially where malloc()/free() are not too speedy.
841 * NB: alloc routines never return NULL. They exit to error_exit if not
845 #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */
846 #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */
847 #define JPOOL_NUMPOOLS 2
849 typedef struct jvirt_sarray_control *jvirt_sarray_ptr;
850 typedef struct jvirt_barray_control *jvirt_barray_ptr;
853 struct jpeg_memory_mgr {
854 /* Method pointers */
855 void *(*alloc_small) (j_common_ptr cinfo, int pool_id, size_t sizeofobject);
856 void *(*alloc_large) (j_common_ptr cinfo, int pool_id,
857 size_t sizeofobject);
858 JSAMPARRAY (*alloc_sarray) (j_common_ptr cinfo, int pool_id,
859 JDIMENSION samplesperrow, JDIMENSION numrows);
860 JBLOCKARRAY (*alloc_barray) (j_common_ptr cinfo, int pool_id,
861 JDIMENSION blocksperrow, JDIMENSION numrows);
862 jvirt_sarray_ptr (*request_virt_sarray) (j_common_ptr cinfo, int pool_id,
864 JDIMENSION samplesperrow,
866 JDIMENSION maxaccess);
867 jvirt_barray_ptr (*request_virt_barray) (j_common_ptr cinfo, int pool_id,
869 JDIMENSION blocksperrow,
871 JDIMENSION maxaccess);
872 void (*realize_virt_arrays) (j_common_ptr cinfo);
873 JSAMPARRAY (*access_virt_sarray) (j_common_ptr cinfo, jvirt_sarray_ptr ptr,
874 JDIMENSION start_row, JDIMENSION num_rows,
876 JBLOCKARRAY (*access_virt_barray) (j_common_ptr cinfo, jvirt_barray_ptr ptr,
877 JDIMENSION start_row, JDIMENSION num_rows,
879 void (*free_pool) (j_common_ptr cinfo, int pool_id);
880 void (*self_destruct) (j_common_ptr cinfo);
882 /* Limit on memory allocation for this JPEG object. (Note that this is
883 * merely advisory, not a guaranteed maximum; it only affects the space
884 * used for virtual-array buffers.) May be changed by outer application
885 * after creating the JPEG object.
887 long max_memory_to_use;
889 /* Maximum allocation request accepted by alloc_large. */
890 long max_alloc_chunk;
894 /* Routine signature for application-supplied marker processing methods.
895 * Need not pass marker code since it is stored in cinfo->unread_marker.
897 typedef boolean (*jpeg_marker_parser_method) (j_decompress_ptr cinfo);
900 /* Originally, this macro was used as a way of defining function prototypes
901 * for both modern compilers as well as older compilers that did not support
902 * prototype parameters. libjpeg-turbo has never supported these older,
903 * non-ANSI compilers, but the macro is still included because there is some
904 * software out there that uses it.
907 #define JPP(arglist) arglist
910 /* Default error-management setup */
911 EXTERN(struct jpeg_error_mgr *) jpeg_std_error(struct jpeg_error_mgr *err);
913 /* Initialization of JPEG compression objects.
914 * jpeg_create_compress() and jpeg_create_decompress() are the exported
915 * names that applications should call. These expand to calls on
916 * jpeg_CreateCompress and jpeg_CreateDecompress with additional information
917 * passed for version mismatch checking.
918 * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
920 #define jpeg_create_compress(cinfo) \
921 jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
922 (size_t)sizeof(struct jpeg_compress_struct))
923 #define jpeg_create_decompress(cinfo) \
924 jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
925 (size_t)sizeof(struct jpeg_decompress_struct))
926 EXTERN(void) jpeg_CreateCompress(j_compress_ptr cinfo, int version,
928 EXTERN(void) jpeg_CreateDecompress(j_decompress_ptr cinfo, int version,
930 /* Destruction of JPEG compression objects */
931 EXTERN(void) jpeg_destroy_compress(j_compress_ptr cinfo);
932 EXTERN(void) jpeg_destroy_decompress(j_decompress_ptr cinfo);
934 /* Standard data source and destination managers: stdio streams. */
935 /* Caller is responsible for opening the file before and closing after. */
936 EXTERN(void) jpeg_stdio_dest(j_compress_ptr cinfo, FILE *outfile);
937 EXTERN(void) jpeg_stdio_src(j_decompress_ptr cinfo, FILE *infile);
939 #if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
940 /* Data source and destination managers: memory buffers. */
941 EXTERN(void) jpeg_mem_dest(j_compress_ptr cinfo, unsigned char **outbuffer,
942 unsigned long *outsize);
943 EXTERN(void) jpeg_mem_src(j_decompress_ptr cinfo,
944 const unsigned char *inbuffer, unsigned long insize);
947 /* Default parameter setup for compression */
948 EXTERN(void) jpeg_set_defaults(j_compress_ptr cinfo);
949 /* Compression parameter setup aids */
950 EXTERN(void) jpeg_set_colorspace(j_compress_ptr cinfo,
951 J_COLOR_SPACE colorspace);
952 EXTERN(void) jpeg_default_colorspace(j_compress_ptr cinfo);
953 EXTERN(void) jpeg_set_quality(j_compress_ptr cinfo, int quality,
954 boolean force_baseline);
955 EXTERN(void) jpeg_set_linear_quality(j_compress_ptr cinfo, int scale_factor,
956 boolean force_baseline);
957 #if JPEG_LIB_VERSION >= 70
958 EXTERN(void) jpeg_default_qtables(j_compress_ptr cinfo,
959 boolean force_baseline);
961 EXTERN(void) jpeg_add_quant_table(j_compress_ptr cinfo, int which_tbl,
962 const unsigned int *basic_table,
963 int scale_factor, boolean force_baseline);
964 EXTERN(int) jpeg_quality_scaling(int quality);
965 EXTERN(void) jpeg_simple_progression(j_compress_ptr cinfo);
966 EXTERN(void) jpeg_suppress_tables(j_compress_ptr cinfo, boolean suppress);
967 EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table(j_common_ptr cinfo);
968 EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table(j_common_ptr cinfo);
970 /* Main entry points for compression */
971 EXTERN(void) jpeg_start_compress(j_compress_ptr cinfo,
972 boolean write_all_tables);
973 EXTERN(JDIMENSION) jpeg_write_scanlines(j_compress_ptr cinfo,
974 JSAMPARRAY scanlines,
975 JDIMENSION num_lines);
976 EXTERN(void) jpeg_finish_compress(j_compress_ptr cinfo);
978 #if JPEG_LIB_VERSION >= 70
979 /* Precalculate JPEG dimensions for current compression parameters. */
980 EXTERN(void) jpeg_calc_jpeg_dimensions(j_compress_ptr cinfo);
983 /* Replaces jpeg_write_scanlines when writing raw downsampled data. */
984 EXTERN(JDIMENSION) jpeg_write_raw_data(j_compress_ptr cinfo, JSAMPIMAGE data,
985 JDIMENSION num_lines);
987 /* Write a special marker. See libjpeg.txt concerning safe usage. */
988 EXTERN(void) jpeg_write_marker(j_compress_ptr cinfo, int marker,
989 const JOCTET *dataptr, unsigned int datalen);
990 /* Same, but piecemeal. */
991 EXTERN(void) jpeg_write_m_header(j_compress_ptr cinfo, int marker,
992 unsigned int datalen);
993 EXTERN(void) jpeg_write_m_byte(j_compress_ptr cinfo, int val);
995 /* Alternate compression function: just write an abbreviated table file */
996 EXTERN(void) jpeg_write_tables(j_compress_ptr cinfo);
998 /* Write ICC profile. See libjpeg.txt for usage information. */
999 EXTERN(void) jpeg_write_icc_profile(j_compress_ptr cinfo,
1000 const JOCTET *icc_data_ptr,
1001 unsigned int icc_data_len);
1004 /* Decompression startup: read start of JPEG datastream to see what's there */
1005 EXTERN(int) jpeg_read_header(j_decompress_ptr cinfo, boolean require_image);
1006 /* Return value is one of: */
1007 #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */
1008 #define JPEG_HEADER_OK 1 /* Found valid image datastream */
1009 #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */
1010 /* If you pass require_image = TRUE (normal case), you need not check for
1011 * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
1012 * JPEG_SUSPENDED is only possible if you use a data source module that can
1013 * give a suspension return (the stdio source module doesn't).
1016 /* Main entry points for decompression */
1017 EXTERN(boolean) jpeg_start_decompress(j_decompress_ptr cinfo);
1018 EXTERN(JDIMENSION) jpeg_read_scanlines(j_decompress_ptr cinfo,
1019 JSAMPARRAY scanlines,
1020 JDIMENSION max_lines);
1021 EXTERN(JDIMENSION) jpeg_skip_scanlines(j_decompress_ptr cinfo,
1022 JDIMENSION num_lines);
1023 EXTERN(void) jpeg_crop_scanline(j_decompress_ptr cinfo, JDIMENSION *xoffset,
1025 EXTERN(boolean) jpeg_finish_decompress(j_decompress_ptr cinfo);
1027 /* Replaces jpeg_read_scanlines when reading raw downsampled data. */
1028 EXTERN(JDIMENSION) jpeg_read_raw_data(j_decompress_ptr cinfo, JSAMPIMAGE data,
1029 JDIMENSION max_lines);
1031 /* Additional entry points for buffered-image mode. */
1032 EXTERN(boolean) jpeg_has_multiple_scans(j_decompress_ptr cinfo);
1033 EXTERN(boolean) jpeg_start_output(j_decompress_ptr cinfo, int scan_number);
1034 EXTERN(boolean) jpeg_finish_output(j_decompress_ptr cinfo);
1035 EXTERN(boolean) jpeg_input_complete(j_decompress_ptr cinfo);
1036 EXTERN(void) jpeg_new_colormap(j_decompress_ptr cinfo);
1037 EXTERN(int) jpeg_consume_input(j_decompress_ptr cinfo);
1038 /* Return value is one of: */
1039 /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */
1040 #define JPEG_REACHED_SOS 1 /* Reached start of new scan */
1041 #define JPEG_REACHED_EOI 2 /* Reached end of image */
1042 #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */
1043 #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */
1045 /* Precalculate output dimensions for current decompression parameters. */
1046 #if JPEG_LIB_VERSION >= 80
1047 EXTERN(void) jpeg_core_output_dimensions(j_decompress_ptr cinfo);
1049 EXTERN(void) jpeg_calc_output_dimensions(j_decompress_ptr cinfo);
1051 /* Control saving of COM and APPn markers into marker_list. */
1052 EXTERN(void) jpeg_save_markers(j_decompress_ptr cinfo, int marker_code,
1053 unsigned int length_limit);
1055 /* Install a special processing method for COM or APPn markers. */
1056 EXTERN(void) jpeg_set_marker_processor(j_decompress_ptr cinfo,
1058 jpeg_marker_parser_method routine);
1060 /* Read or write raw DCT coefficients --- useful for lossless transcoding. */
1061 EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients(j_decompress_ptr cinfo);
1062 EXTERN(void) jpeg_write_coefficients(j_compress_ptr cinfo,
1063 jvirt_barray_ptr *coef_arrays);
1064 EXTERN(void) jpeg_copy_critical_parameters(j_decompress_ptr srcinfo,
1065 j_compress_ptr dstinfo);
1067 /* If you choose to abort compression or decompression before completing
1068 * jpeg_finish_(de)compress, then you need to clean up to release memory,
1069 * temporary files, etc. You can just call jpeg_destroy_(de)compress
1070 * if you're done with the JPEG object, but if you want to clean it up and
1071 * reuse it, call this:
1073 EXTERN(void) jpeg_abort_compress(j_compress_ptr cinfo);
1074 EXTERN(void) jpeg_abort_decompress(j_decompress_ptr cinfo);
1076 /* Generic versions of jpeg_abort and jpeg_destroy that work on either
1077 * flavor of JPEG object. These may be more convenient in some places.
1079 EXTERN(void) jpeg_abort(j_common_ptr cinfo);
1080 EXTERN(void) jpeg_destroy(j_common_ptr cinfo);
1082 /* Default restart-marker-resync procedure for use by data source modules */
1083 EXTERN(boolean) jpeg_resync_to_restart(j_decompress_ptr cinfo, int desired);
1085 /* Read ICC profile. See libjpeg.txt for usage information. */
1086 EXTERN(boolean) jpeg_read_icc_profile(j_decompress_ptr cinfo,
1087 JOCTET **icc_data_ptr,
1088 unsigned int *icc_data_len);
1091 /* These marker codes are exported since applications and data source modules
1092 * are likely to want to use them.
1095 #define JPEG_RST0 0xD0 /* RST0 marker code */
1096 #define JPEG_EOI 0xD9 /* EOI marker code */
1097 #define JPEG_APP0 0xE0 /* APP0 marker code */
1098 #define JPEG_COM 0xFE /* COM marker code */
1101 /* If we have a brain-damaged compiler that emits warnings (or worse, errors)
1102 * for structure definitions that are never filled in, keep it quiet by
1103 * supplying dummy definitions for the various substructures.
1106 #ifdef INCOMPLETE_TYPES_BROKEN
1107 #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */
1108 struct jvirt_sarray_control { long dummy; };
1109 struct jvirt_barray_control { long dummy; };
1110 struct jpeg_comp_master { long dummy; };
1111 struct jpeg_c_main_controller { long dummy; };
1112 struct jpeg_c_prep_controller { long dummy; };
1113 struct jpeg_c_coef_controller { long dummy; };
1114 struct jpeg_marker_writer { long dummy; };
1115 struct jpeg_color_converter { long dummy; };
1116 struct jpeg_downsampler { long dummy; };
1117 struct jpeg_forward_dct { long dummy; };
1118 struct jpeg_entropy_encoder { long dummy; };
1119 struct jpeg_decomp_master { long dummy; };
1120 struct jpeg_d_main_controller { long dummy; };
1121 struct jpeg_d_coef_controller { long dummy; };
1122 struct jpeg_d_post_controller { long dummy; };
1123 struct jpeg_input_controller { long dummy; };
1124 struct jpeg_marker_reader { long dummy; };
1125 struct jpeg_entropy_decoder { long dummy; };
1126 struct jpeg_inverse_dct { long dummy; };
1127 struct jpeg_upsampler { long dummy; };
1128 struct jpeg_color_deconverter { long dummy; };
1129 struct jpeg_color_quantizer { long dummy; };
1130 #endif /* JPEG_INTERNALS */
1131 #endif /* INCOMPLETE_TYPES_BROKEN */
1135 * The JPEG library modules define JPEG_INTERNALS before including this file.
1136 * The internal structure declarations are read only when that is true.
1137 * Applications using the library should not include jpegint.h, but may wish
1138 * to include jerror.h.
1141 #ifdef JPEG_INTERNALS
1142 #include "jpegint.h" /* fetch private declarations */
1143 #include "jerror.h" /* fetch error codes too */
1147 #ifndef DONT_USE_EXTERN_C
1152 #endif /* JPEGLIB_H */