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1 | /* | ||
2 | * jpeglib.h | ||
3 | * | ||
4 | * Copyright (C) 1991-1998, Thomas G. Lane. | ||
5 | * This file is part of the Independent JPEG Group's software. | ||
6 | * For conditions of distribution and use, see the accompanying README file. | ||
7 | * | ||
8 | * This file defines the application interface for the JPEG library. | ||
9 | * Most applications using the library need only include this file, | ||
10 | * and perhaps jerror.h if they want to know the exact error codes. | ||
11 | */ | ||
12 | |||
13 | #ifndef JPEGLIB_H | ||
14 | #define JPEGLIB_H | ||
15 | |||
16 | /* | ||
17 | * First we include the configuration files that record how this | ||
18 | * installation of the JPEG library is set up. jconfig.h can be | ||
19 | * generated automatically for many systems. jmorecfg.h contains | ||
20 | * manual configuration options that most people need not worry about. | ||
21 | */ | ||
22 | |||
23 | #ifndef JCONFIG_INCLUDED/* in case jinclude.h already did */ | ||
24 | #include "jconfig.h" /* widely used configuration options */ | ||
25 | #endif | ||
26 | #include "jmorecfg.h" /* seldom changed options */ | ||
27 | |||
28 | |||
29 | /* Version ID for the JPEG library. | ||
30 | * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60". | ||
31 | */ | ||
32 | |||
33 | #define JPEG_LIB_VERSION 62/* Version 6b */ | ||
34 | |||
35 | |||
36 | /* Various constants determining the sizes of things. | ||
37 | * All of these are specified by the JPEG standard, so don't change them | ||
38 | * if you want to be compatible. | ||
39 | */ | ||
40 | |||
41 | #define DCTSIZE 8/* The basic DCT block is 8x8 samples */ | ||
42 | #define DCTSIZE2 64/* DCTSIZE squared; # of elements in a block */ | ||
43 | #define NUM_QUANT_TBLS 4/* Quantization tables are numbered 0..3 */ | ||
44 | #define NUM_HUFF_TBLS 4/* Huffman tables are numbered 0..3 */ | ||
45 | #define NUM_ARITH_TBLS 16/* Arith-coding tables are numbered 0..15 */ | ||
46 | #define MAX_COMPS_IN_SCAN 4/* JPEG limit on # of components in one scan */ | ||
47 | #define MAX_SAMP_FACTOR 4/* JPEG limit on sampling factors */ | ||
48 | /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard; | ||
49 | * the PostScript DCT filter can emit files with many more than 10 blocks/MCU. | ||
50 | * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU | ||
51 | * to handle it. We even let you do this from the jconfig.h file. However, | ||
52 | * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe | ||
53 | * sometimes emits noncompliant files doesn't mean you should too. | ||
54 | */ | ||
55 | #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */ | ||
56 | #ifndef D_MAX_BLOCKS_IN_MCU | ||
57 | #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */ | ||
58 | #endif | ||
59 | |||
60 | |||
61 | /* Data structures for images (arrays of samples and of DCT coefficients). | ||
62 | * On 80x86 machines, the image arrays are too big for near pointers, | ||
63 | * but the pointer arrays can fit in near memory. | ||
64 | */ | ||
65 | |||
66 | typedef JSAMPLE FAR *JSAMPROW;/* ptr to one image row of pixel samples. */ | ||
67 | typedef JSAMPROW *JSAMPARRAY;/* ptr to some rows (a 2-D sample array) */ | ||
68 | typedef JSAMPARRAY *JSAMPIMAGE;/* a 3-D sample array: top index is color */ | ||
69 | |||
70 | typedef JCOEF JBLOCK[DCTSIZE2];/* one block of coefficients */ | ||
71 | typedef JBLOCK FAR *JBLOCKROW;/* pointer to one row of coefficient blocks */ | ||
72 | typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ | ||
73 | typedef JBLOCKARRAY *JBLOCKIMAGE;/* a 3-D array of coefficient blocks */ | ||
74 | |||
75 | typedef JCOEF FAR *JCOEFPTR;/* useful in a couple of places */ | ||
76 | |||
77 | |||
78 | /* Types for JPEG compression parameters and working tables. */ | ||
79 | |||
80 | |||
81 | /* DCT coefficient quantization tables. */ | ||
82 | |||
83 | typedef struct { | ||
84 | /* This array gives the coefficient quantizers in natural array order | ||
85 | * (not the zigzag order in which they are stored in a JPEG DQT marker). | ||
86 | * CAUTION: IJG versions prior to v6a kept this array in zigzag order. | ||
87 | */ | ||
88 | UINT16 quantval[DCTSIZE2];/* quantization step for each coefficient */ | ||
89 | /* This field is used only during compression. It's initialized FALSE when | ||
90 | * the table is created, and set TRUE when it's been output to the file. | ||
91 | * You could suppress output of a table by setting this to TRUE. | ||
92 | * (See jpeg_suppress_tables for an example.) | ||
93 | */ | ||
94 | boolean sent_table; /* TRUE when table has been output */ | ||
95 | } JQUANT_TBL; | ||
96 | |||
97 | |||
98 | /* Huffman coding tables. */ | ||
99 | |||
100 | typedef struct { | ||
101 | /* These two fields directly represent the contents of a JPEG DHT marker */ | ||
102 | UINT8 bits[17]; /* bits[k] = # of symbols with codes of */ | ||
103 | /* length k bits; bits[0] is unused */ | ||
104 | UINT8 huffval[256]; /* The symbols, in order of incr code length */ | ||
105 | /* This field is used only during compression. It's initialized FALSE when | ||
106 | * the table is created, and set TRUE when it's been output to the file. | ||
107 | * You could suppress output of a table by setting this to TRUE. | ||
108 | * (See jpeg_suppress_tables for an example.) | ||
109 | */ | ||
110 | boolean sent_table; /* TRUE when table has been output */ | ||
111 | } JHUFF_TBL; | ||
112 | |||
113 | |||
114 | /* Basic info about one component (color channel). */ | ||
115 | |||
116 | typedef struct { | ||
117 | /* These values are fixed over the whole image. */ | ||
118 | /* For compression, they must be supplied by parameter setup; */ | ||
119 | /* for decompression, they are read from the SOF marker. */ | ||
120 | int component_id; /* identifier for this component (0..255) */ | ||
121 | int component_index; /* its index in SOF or cinfo->comp_info[] */ | ||
122 | int h_samp_factor; /* horizontal sampling factor (1..4) */ | ||
123 | int v_samp_factor; /* vertical sampling factor (1..4) */ | ||
124 | int quant_tbl_no; /* quantization table selector (0..3) */ | ||
125 | /* These values may vary between scans. */ | ||
126 | /* For compression, they must be supplied by parameter setup; */ | ||
127 | /* for decompression, they are read from the SOS marker. */ | ||
128 | /* The decompressor output side may not use these variables. */ | ||
129 | int dc_tbl_no; /* DC entropy table selector (0..3) */ | ||
130 | int ac_tbl_no; /* AC entropy table selector (0..3) */ | ||
131 | |||
132 | /* Remaining fields should be treated as private by applications. */ | ||
133 | |||
134 | /* These values are computed during compression or decompression startup: */ | ||
135 | /* Component's size in DCT blocks. | ||
136 | * Any dummy blocks added to complete an MCU are not counted; therefore | ||
137 | * these values do not depend on whether a scan is interleaved or not. | ||
138 | */ | ||
139 | JDIMENSION width_in_blocks; | ||
140 | JDIMENSION height_in_blocks; | ||
141 | /* Size of a DCT block in samples. Always DCTSIZE for compression. | ||
142 | * For decompression this is the size of the output from one DCT block, | ||
143 | * reflecting any scaling we choose to apply during the IDCT step. | ||
144 | * Values of 1,2,4,8 are likely to be supported. Note that different | ||
145 | * components may receive different IDCT scalings. | ||
146 | */ | ||
147 | int DCT_scaled_size; | ||
148 | /* The downsampled dimensions are the component's actual, unpadded number | ||
149 | * of samples at the main buffer (preprocessing/compression interface), thus | ||
150 | * downsampled_width = ceil(image_width * Hi/Hmax) | ||
151 | * and similarly for height. For decompression, IDCT scaling is included, so | ||
152 | * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE) | ||
153 | */ | ||
154 | JDIMENSION downsampled_width; /* actual width in samples */ | ||
155 | JDIMENSION downsampled_height; /* actual height in samples */ | ||
156 | /* This flag is used only for decompression. In cases where some of the | ||
157 | * components will be ignored (eg grayscale output from YCbCr image), | ||
158 | * we can skip most computations for the unused components. | ||
159 | */ | ||
160 | boolean component_needed;/* do we need the value of this component? */ | ||
161 | |||
162 | /* These values are computed before starting a scan of the component. */ | ||
163 | /* The decompressor output side may not use these variables. */ | ||
164 | int MCU_width; /* number of blocks per MCU, horizontally */ | ||
165 | int MCU_height; /* number of blocks per MCU, vertically */ | ||
166 | int MCU_blocks; /* MCU_width * MCU_height */ | ||
167 | int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */ | ||
168 | int last_col_width; /* # of non-dummy blocks across in last MCU */ | ||
169 | int last_row_height; /* # of non-dummy blocks down in last MCU */ | ||
170 | |||
171 | /* Saved quantization table for component; NULL if none yet saved. | ||
172 | * See jdinput.c comments about the need for this information. | ||
173 | * This field is currently used only for decompression. | ||
174 | */ | ||
175 | JQUANT_TBL * quant_table; | ||
176 | |||
177 | /* Private per-component storage for DCT or IDCT subsystem. */ | ||
178 | void * dct_table; | ||
179 | } jpeg_component_info; | ||
180 | |||
181 | |||
182 | /* The script for encoding a multiple-scan file is an array of these: */ | ||
183 | |||
184 | typedef struct { | ||
185 | int comps_in_scan; /* number of components encoded in this scan */ | ||
186 | int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */ | ||
187 | int Ss, Se; /* progressive JPEG spectral selection parms */ | ||
188 | int Ah, Al; /* progressive JPEG successive approx. parms */ | ||
189 | } jpeg_scan_info; | ||
190 | |||
191 | /* The decompressor can save APPn and COM markers in a list of these: */ | ||
192 | |||
193 | typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr; | ||
194 | |||
195 | struct jpeg_marker_struct { | ||
196 | jpeg_saved_marker_ptr next;/* next in list, or NULL */ | ||
197 | UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */ | ||
198 | unsigned int original_length;/* # bytes of data in the file */ | ||
199 | unsigned int data_length;/* # bytes of data saved at data[] */ | ||
200 | JOCTET FAR * data; /* the data contained in the marker */ | ||
201 | /* the marker length word is not counted in data_length or original_length */ | ||
202 | }; | ||
203 | |||
204 | /* Known color spaces. */ | ||
205 | |||
206 | typedef enum { | ||
207 | JCS_UNKNOWN, /* error/unspecified */ | ||
208 | JCS_GRAYSCALE, /* monochrome */ | ||
209 | JCS_RGB, /* red/green/blue */ | ||
210 | JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */ | ||
211 | JCS_CMYK, /* C/M/Y/K */ | ||
212 | JCS_YCCK /* Y/Cb/Cr/K */ | ||
213 | } J_COLOR_SPACE; | ||
214 | |||
215 | /* DCT/IDCT algorithm options. */ | ||
216 | |||
217 | typedef enum { | ||
218 | JDCT_ISLOW, /* slow but accurate integer algorithm */ | ||
219 | JDCT_IFAST, /* faster, less accurate integer method */ | ||
220 | JDCT_FLOAT /* floating-point: accurate, fast on fast HW */ | ||
221 | } J_DCT_METHOD; | ||
222 | |||
223 | #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */ | ||
224 | #define JDCT_DEFAULT JDCT_ISLOW | ||
225 | #endif | ||
226 | #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */ | ||
227 | #define JDCT_FASTEST JDCT_IFAST | ||
228 | #endif | ||
229 | |||
230 | /* Dithering options for decompression. */ | ||
231 | |||
232 | typedef enum { | ||
233 | JDITHER_NONE, /* no dithering */ | ||
234 | JDITHER_ORDERED,/* simple ordered dither */ | ||
235 | JDITHER_FS /* Floyd-Steinberg error diffusion dither */ | ||
236 | } J_DITHER_MODE; | ||
237 | |||
238 | |||
239 | /* Common fields between JPEG compression and decompression master structs. */ | ||
240 | |||
241 | #define jpeg_common_fields \ | ||
242 | struct jpeg_error_mgr * err;/* Error handler module */\ | ||
243 | struct jpeg_memory_mgr * mem;/* Memory manager module */\ | ||
244 | struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\ | ||
245 | void * client_data; /* Available for use by application */\ | ||
246 | boolean is_decompressor;/* So common code can tell which is which */\ | ||
247 | int global_state /* For checking call sequence validity */ | ||
248 | |||
249 | /* Routines that are to be used by both halves of the library are declared | ||
250 | * to receive a pointer to this structure. There are no actual instances of | ||
251 | * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct. | ||
252 | */ | ||
253 | struct jpeg_common_struct { | ||
254 | jpeg_common_fields; /* Fields common to both master struct types */ | ||
255 | /* Additional fields follow in an actual jpeg_compress_struct or | ||
256 | * jpeg_decompress_struct. All three structs must agree on these | ||
257 | * initial fields! (This would be a lot cleaner in C++.) | ||
258 | */ | ||
259 | }; | ||
260 | |||
261 | typedef struct jpeg_common_struct * j_common_ptr; | ||
262 | typedef struct jpeg_compress_struct * j_compress_ptr; | ||
263 | typedef struct jpeg_decompress_struct * j_decompress_ptr; | ||
264 | |||
265 | |||
266 | /* Master record for a compression instance */ | ||
267 | |||
268 | struct jpeg_compress_struct { | ||
269 | jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */ | ||
270 | |||
271 | /* Destination for compressed data */ | ||
272 | struct jpeg_destination_mgr * dest; | ||
273 | |||
274 | /* Description of source image --- these fields must be filled in by | ||
275 | * outer application before starting compression. in_color_space must | ||
276 | * be correct before you can even call jpeg_set_defaults(). | ||
277 | */ | ||
278 | |||
279 | JDIMENSION image_width;/* input image width */ | ||
280 | JDIMENSION image_height;/* input image height */ | ||
281 | int input_components; /* # of color components in input image */ | ||
282 | J_COLOR_SPACE in_color_space;/* colorspace of input image */ | ||
283 | |||
284 | double input_gamma; /* image gamma of input image */ | ||
285 | |||
286 | /* Compression parameters --- these fields must be set before calling | ||
287 | * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to | ||
288 | * initialize everything to reasonable defaults, then changing anything | ||
289 | * the application specifically wants to change. That way you won't get | ||
290 | * burnt when new parameters are added. Also note that there are several | ||
291 | * helper routines to simplify changing parameters. | ||
292 | */ | ||
293 | |||
294 | int data_precision; /* bits of precision in image data */ | ||
295 | |||
296 | int num_components; /* # of color components in JPEG image */ | ||
297 | J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ | ||
298 | |||
299 | jpeg_component_info * comp_info; | ||
300 | /* comp_info[i] describes component that appears i'th in SOF */ | ||
301 | |||
302 | JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; | ||
303 | /* ptrs to coefficient quantization tables, or NULL if not defined */ | ||
304 | |||
305 | JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; | ||
306 | JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; | ||
307 | /* ptrs to Huffman coding tables, or NULL if not defined */ | ||
308 | |||
309 | UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ | ||
310 | UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ | ||
311 | UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ | ||
312 | |||
313 | int num_scans; /* # of entries in scan_info array */ | ||
314 | const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */ | ||
315 | /* The default value of scan_info is NULL, which causes a single-scan | ||
316 | * sequential JPEG file to be emitted. To create a multi-scan file, | ||
317 | * set num_scans and scan_info to point to an array of scan definitions. | ||
318 | */ | ||
319 | |||
320 | boolean raw_data_in; /* TRUE=caller supplies downsampled data */ | ||
321 | boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ | ||
322 | boolean optimize_coding;/* TRUE=optimize entropy encoding parms */ | ||
323 | boolean CCIR601_sampling;/* TRUE=first samples are cosited */ | ||
324 | int smoothing_factor; /* 1..100, or 0 for no input smoothing */ | ||
325 | J_DCT_METHOD dct_method;/* DCT algorithm selector */ | ||
326 | |||
327 | /* The restart interval can be specified in absolute MCUs by setting | ||
328 | * restart_interval, or in MCU rows by setting restart_in_rows | ||
329 | * (in which case the correct restart_interval will be figured | ||
330 | * for each scan). | ||
331 | */ | ||
332 | unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */ | ||
333 | int restart_in_rows; /* if > 0, MCU rows per restart interval */ | ||
334 | |||
335 | /* Parameters controlling emission of special markers. */ | ||
336 | |||
337 | boolean write_JFIF_header;/* should a JFIF marker be written? */ | ||
338 | UINT8 JFIF_major_version;/* What to write for the JFIF version number */ | ||
339 | UINT8 JFIF_minor_version; | ||
340 | /* These three values are not used by the JPEG code, merely copied */ | ||
341 | /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */ | ||
342 | /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */ | ||
343 | /* ratio is defined by X_density/Y_density even when density_unit=0. */ | ||
344 | UINT8 density_unit; /* JFIF code for pixel size units */ | ||
345 | UINT16 X_density; /* Horizontal pixel density */ | ||
346 | UINT16 Y_density; /* Vertical pixel density */ | ||
347 | boolean write_Adobe_marker;/* should an Adobe marker be written? */ | ||
348 | |||
349 | /* State variable: index of next scanline to be written to | ||
350 | * jpeg_write_scanlines(). Application may use this to control its | ||
351 | * processing loop, e.g., "while (next_scanline < image_height)". | ||
352 | */ | ||
353 | |||
354 | JDIMENSION next_scanline;/* 0 .. image_height-1 */ | ||
355 | |||
356 | /* Remaining fields are known throughout compressor, but generally | ||
357 | * should not be touched by a surrounding application. | ||
358 | */ | ||
359 | |||
360 | /* | ||
361 | * These fields are computed during compression startup | ||
362 | */ | ||
363 | boolean progressive_mode;/* TRUE if scan script uses progressive mode */ | ||
364 | int max_h_samp_factor;/* largest h_samp_factor */ | ||
365 | int max_v_samp_factor;/* largest v_samp_factor */ | ||
366 | |||
367 | JDIMENSION total_iMCU_rows;/* # of iMCU rows to be input to coef ctlr */ | ||
368 | /* The coefficient controller receives data in units of MCU rows as defined | ||
369 | * for fully interleaved scans (whether the JPEG file is interleaved or not). | ||
370 | * There are v_samp_factor * DCTSIZE sample rows of each component in an | ||
371 | * "iMCU" (interleaved MCU) row. | ||
372 | */ | ||
373 | |||
374 | /* | ||
375 | * These fields are valid during any one scan. | ||
376 | * They describe the components and MCUs actually appearing in the scan. | ||
377 | */ | ||
378 | int comps_in_scan; /* # of JPEG components in this scan */ | ||
379 | jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; | ||
380 | /* *cur_comp_info[i] describes component that appears i'th in SOS */ | ||
381 | |||
382 | JDIMENSION MCUs_per_row;/* # of MCUs across the image */ | ||
383 | JDIMENSION MCU_rows_in_scan;/* # of MCU rows in the image */ | ||
384 | |||
385 | int blocks_in_MCU; /* # of DCT blocks per MCU */ | ||
386 | int MCU_membership[C_MAX_BLOCKS_IN_MCU]; | ||
387 | /* MCU_membership[i] is index in cur_comp_info of component owning */ | ||
388 | /* i'th block in an MCU */ | ||
389 | |||
390 | int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ | ||
391 | |||
392 | /* | ||
393 | * Links to compression subobjects (methods and private variables of modules) | ||
394 | */ | ||
395 | struct jpeg_comp_master * master; | ||
396 | struct jpeg_c_main_controller * main; | ||
397 | struct jpeg_c_prep_controller * prep; | ||
398 | struct jpeg_c_coef_controller * coef; | ||
399 | struct jpeg_marker_writer * marker; | ||
400 | struct jpeg_color_converter * cconvert; | ||
401 | struct jpeg_downsampler * downsample; | ||
402 | struct jpeg_forward_dct * fdct; | ||
403 | struct jpeg_entropy_encoder * entropy; | ||
404 | jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */ | ||
405 | int script_space_size; | ||
406 | }; | ||
407 | |||
408 | |||
409 | /* Master record for a decompression instance */ | ||
410 | |||
411 | struct jpeg_decompress_struct { | ||
412 | jpeg_common_fields; /* Fields shared with jpeg_compress_struct */ | ||
413 | |||
414 | /* Source of compressed data */ | ||
415 | struct jpeg_source_mgr * src; | ||
416 | |||
417 | /* Basic description of image --- filled in by jpeg_read_header(). */ | ||
418 | /* Application may inspect these values to decide how to process image. */ | ||
419 | |||
420 | JDIMENSION image_width;/* nominal image width (from SOF marker) */ | ||
421 | JDIMENSION image_height;/* nominal image height */ | ||
422 | int num_components; /* # of color components in JPEG image */ | ||
423 | J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ | ||
424 | |||
425 | /* Decompression processing parameters --- these fields must be set before | ||
426 | * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes | ||
427 | * them to default values. | ||
428 | */ | ||
429 | |||
430 | J_COLOR_SPACE out_color_space; /* colorspace for output */ | ||
431 | |||
432 | unsigned int scale_num, scale_denom; /* fraction by which to scale image */ | ||
433 | |||
434 | double output_gamma; /* image gamma wanted in output */ | ||
435 | |||
436 | boolean buffered_image;/* TRUE=multiple output passes */ | ||
437 | boolean raw_data_out; /* TRUE=downsampled data wanted */ | ||
438 | |||
439 | J_DCT_METHOD dct_method;/* IDCT algorithm selector */ | ||
440 | boolean do_fancy_upsampling;/* TRUE=apply fancy upsampling */ | ||
441 | boolean do_block_smoothing;/* TRUE=apply interblock smoothing */ | ||
442 | |||
443 | boolean quantize_colors;/* TRUE=colormapped output wanted */ | ||
444 | /* the following are ignored if not quantize_colors: */ | ||
445 | J_DITHER_MODE dither_mode;/* type of color dithering to use */ | ||
446 | boolean two_pass_quantize;/* TRUE=use two-pass color quantization */ | ||
447 | int desired_number_of_colors;/* max # colors to use in created colormap */ | ||
448 | /* these are significant only in buffered-image mode: */ | ||
449 | boolean enable_1pass_quant;/* enable future use of 1-pass quantizer */ | ||
450 | boolean enable_external_quant;/* enable future use of external colormap */ | ||
451 | boolean enable_2pass_quant;/* enable future use of 2-pass quantizer */ | ||
452 | |||
453 | /* Description of actual output image that will be returned to application. | ||
454 | * These fields are computed by jpeg_start_decompress(). | ||
455 | * You can also use jpeg_calc_output_dimensions() to determine these values | ||
456 | * in advance of calling jpeg_start_decompress(). | ||
457 | */ | ||
458 | |||
459 | JDIMENSION output_width;/* scaled image width */ | ||
460 | JDIMENSION output_height;/* scaled image height */ | ||
461 | int out_color_components;/* # of color components in out_color_space */ | ||
462 | int output_components;/* # of color components returned */ | ||
463 | /* output_components is 1 (a colormap index) when quantizing colors; | ||
464 | * otherwise it equals out_color_components. | ||
465 | */ | ||
466 | int rec_outbuf_height;/* min recommended height of scanline buffer */ | ||
467 | /* If the buffer passed to jpeg_read_scanlines() is less than this many rows | ||
468 | * high, space and time will be wasted due to unnecessary data copying. | ||
469 | * Usually rec_outbuf_height will be 1 or 2, at most 4. | ||
470 | */ | ||
471 | |||
472 | /* When quantizing colors, the output colormap is described by these fields. | ||
473 | * The application can supply a colormap by setting colormap non-NULL before | ||
474 | * calling jpeg_start_decompress; otherwise a colormap is created during | ||
475 | * jpeg_start_decompress or jpeg_start_output. | ||
476 | * The map has out_color_components rows and actual_number_of_colors columns. | ||
477 | */ | ||
478 | int actual_number_of_colors;/* number of entries in use */ | ||
479 | JSAMPARRAY colormap; /* The color map as a 2-D pixel array */ | ||
480 | |||
481 | /* State variables: these variables indicate the progress of decompression. | ||
482 | * The application may examine these but must not modify them. | ||
483 | */ | ||
484 | |||
485 | /* Row index of next scanline to be read from jpeg_read_scanlines(). | ||
486 | * Application may use this to control its processing loop, e.g., | ||
487 | * "while (output_scanline < output_height)". | ||
488 | */ | ||
489 | JDIMENSION output_scanline;/* 0 .. output_height-1 */ | ||
490 | |||
491 | /* Current input scan number and number of iMCU rows completed in scan. | ||
492 | * These indicate the progress of the decompressor input side. | ||
493 | */ | ||
494 | int input_scan_number;/* Number of SOS markers seen so far */ | ||
495 | JDIMENSION input_iMCU_row;/* Number of iMCU rows completed */ | ||
496 | |||
497 | /* The "output scan number" is the notional scan being displayed by the | ||
498 | * output side. The decompressor will not allow output scan/row number | ||
499 | * to get ahead of input scan/row, but it can fall arbitrarily far behind. | ||
500 | */ | ||
501 | int output_scan_number;/* Nominal scan number being displayed */ | ||
502 | JDIMENSION output_iMCU_row;/* Number of iMCU rows read */ | ||
503 | |||
504 | /* Current progression status. coef_bits[c][i] indicates the precision | ||
505 | * with which component c's DCT coefficient i (in zigzag order) is known. | ||
506 | * It is -1 when no data has yet been received, otherwise it is the point | ||
507 | * transform (shift) value for the most recent scan of the coefficient | ||
508 | * (thus, 0 at completion of the progression). | ||
509 | * This pointer is NULL when reading a non-progressive file. | ||
510 | */ | ||
511 | int (*coef_bits)[DCTSIZE2];/* -1 or current Al value for each coef */ | ||
512 | |||
513 | /* Internal JPEG parameters --- the application usually need not look at | ||
514 | * these fields. Note that the decompressor output side may not use | ||
515 | * any parameters that can change between scans. | ||
516 | */ | ||
517 | |||
518 | /* Quantization and Huffman tables are carried forward across input | ||
519 | * datastreams when processing abbreviated JPEG datastreams. | ||
520 | */ | ||
521 | |||
522 | JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; | ||
523 | /* ptrs to coefficient quantization tables, or NULL if not defined */ | ||
524 | |||
525 | JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; | ||
526 | JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; | ||
527 | /* ptrs to Huffman coding tables, or NULL if not defined */ | ||
528 | |||
529 | /* These parameters are never carried across datastreams, since they | ||
530 | * are given in SOF/SOS markers or defined to be reset by SOI. | ||
531 | */ | ||
532 | |||
533 | int data_precision; /* bits of precision in image data */ | ||
534 | |||
535 | jpeg_component_info * comp_info; | ||
536 | /* comp_info[i] describes component that appears i'th in SOF */ | ||
537 | |||
538 | boolean progressive_mode;/* TRUE if SOFn specifies progressive mode */ | ||
539 | boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ | ||
540 | |||
541 | UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ | ||
542 | UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ | ||
543 | UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ | ||
544 | |||
545 | unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */ | ||
546 | |||
547 | /* These fields record data obtained from optional markers recognized by | ||
548 | * the JPEG library. | ||
549 | */ | ||
550 | boolean saw_JFIF_marker;/* TRUE iff a JFIF APP0 marker was found */ | ||
551 | /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */ | ||
552 | UINT8 JFIF_major_version;/* JFIF version number */ | ||
553 | UINT8 JFIF_minor_version; | ||
554 | UINT8 density_unit; /* JFIF code for pixel size units */ | ||
555 | UINT16 X_density; /* Horizontal pixel density */ | ||
556 | UINT16 Y_density; /* Vertical pixel density */ | ||
557 | boolean saw_Adobe_marker;/* TRUE iff an Adobe APP14 marker was found */ | ||
558 | UINT8 Adobe_transform;/* Color transform code from Adobe marker */ | ||
559 | |||
560 | boolean CCIR601_sampling;/* TRUE=first samples are cosited */ | ||
561 | |||
562 | /* Aside from the specific data retained from APPn markers known to the | ||
563 | * library, the uninterpreted contents of any or all APPn and COM markers | ||
564 | * can be saved in a list for examination by the application. | ||
565 | */ | ||
566 | jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */ | ||
567 | |||
568 | /* Remaining fields are known throughout decompressor, but generally | ||
569 | * should not be touched by a surrounding application. | ||
570 | */ | ||
571 | |||
572 | /* | ||
573 | * These fields are computed during decompression startup | ||
574 | */ | ||
575 | int max_h_samp_factor;/* largest h_samp_factor */ | ||
576 | int max_v_samp_factor;/* largest v_samp_factor */ | ||
577 | |||
578 | int min_DCT_scaled_size;/* smallest DCT_scaled_size of any component */ | ||
579 | |||
580 | JDIMENSION total_iMCU_rows;/* # of iMCU rows in image */ | ||
581 | /* The coefficient controller's input and output progress is measured in | ||
582 | * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows | ||
583 | * in fully interleaved JPEG scans, but are used whether the scan is | ||
584 | * interleaved or not. We define an iMCU row as v_samp_factor DCT block | ||
585 | * rows of each component. Therefore, the IDCT output contains | ||
586 | * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row. | ||
587 | */ | ||
588 | |||
589 | JSAMPLE * sample_range_limit; /* table for fast range-limiting */ | ||
590 | |||
591 | /* | ||
592 | * These fields are valid during any one scan. | ||
593 | * They describe the components and MCUs actually appearing in the scan. | ||
594 | * Note that the decompressor output side must not use these fields. | ||
595 | */ | ||
596 | int comps_in_scan; /* # of JPEG components in this scan */ | ||
597 | jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; | ||
598 | /* *cur_comp_info[i] describes component that appears i'th in SOS */ | ||
599 | |||
600 | JDIMENSION MCUs_per_row;/* # of MCUs across the image */ | ||
601 | JDIMENSION MCU_rows_in_scan;/* # of MCU rows in the image */ | ||
602 | |||
603 | int blocks_in_MCU; /* # of DCT blocks per MCU */ | ||
604 | int MCU_membership[D_MAX_BLOCKS_IN_MCU]; | ||
605 | /* MCU_membership[i] is index in cur_comp_info of component owning */ | ||
606 | /* i'th block in an MCU */ | ||
607 | |||
608 | int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ | ||
609 | |||
610 | /* This field is shared between entropy decoder and marker parser. | ||
611 | * It is either zero or the code of a JPEG marker that has been | ||
612 | * read from the data source, but has not yet been processed. | ||
613 | */ | ||
614 | int unread_marker; | ||
615 | |||
616 | /* | ||
617 | * Links to decompression subobjects (methods, private variables of modules) | ||
618 | */ | ||
619 | struct jpeg_decomp_master * master; | ||
620 | struct jpeg_d_main_controller * main; | ||
621 | struct jpeg_d_coef_controller * coef; | ||
622 | struct jpeg_d_post_controller * post; | ||
623 | struct jpeg_input_controller * inputctl; | ||
624 | struct jpeg_marker_reader * marker; | ||
625 | struct jpeg_entropy_decoder * entropy; | ||
626 | struct jpeg_inverse_dct * idct; | ||
627 | struct jpeg_upsampler * upsample; | ||
628 | struct jpeg_color_deconverter * cconvert; | ||
629 | struct jpeg_color_quantizer * cquantize; | ||
630 | }; | ||
631 | |||
632 | |||
633 | /* "Object" declarations for JPEG modules that may be supplied or called | ||
634 | * directly by the surrounding application. | ||
635 | * As with all objects in the JPEG library, these structs only define the | ||
636 | * publicly visible methods and state variables of a module. Additional | ||
637 | * private fields may exist after the public ones. | ||
638 | */ | ||
639 | |||
640 | |||
641 | /* Error handler object */ | ||
642 | |||
643 | struct jpeg_error_mgr { | ||
644 | /* Error exit handler: does not return to caller */ | ||
645 | JMETHOD(void, error_exit, (j_common_ptr cinfo)); | ||
646 | /* Conditionally emit a trace or warning message */ | ||
647 | JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level)); | ||
648 | /* Routine that actually outputs a trace or error message */ | ||
649 | JMETHOD(void, output_message, (j_common_ptr cinfo)); | ||
650 | /* Format a message string for the most recent JPEG error or message */ | ||
651 | JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer)); | ||
652 | #define JMSG_LENGTH_MAX 200/* recommended size of format_message buffer */ | ||
653 | /* Reset error state variables at start of a new image */ | ||
654 | JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo)); | ||
655 | |||
656 | /* The message ID code and any parameters are saved here. | ||
657 | * A message can have one string parameter or up to 8 int parameters. | ||
658 | */ | ||
659 | int msg_code; | ||
660 | #define JMSG_STR_PARM_MAX 80 | ||
661 | union { | ||
662 | int i[8]; | ||
663 | char s[JMSG_STR_PARM_MAX]; | ||
664 | } msg_parm; | ||
665 | |||
666 | /* Standard state variables for error facility */ | ||
667 | |||
668 | int trace_level; /* max msg_level that will be displayed */ | ||
669 | |||
670 | /* For recoverable corrupt-data errors, we emit a warning message, | ||
671 | * but keep going unless emit_message chooses to abort. emit_message | ||
672 | * should count warnings in num_warnings. The surrounding application | ||
673 | * can check for bad data by seeing if num_warnings is nonzero at the | ||
674 | * end of processing. | ||
675 | */ | ||
676 | long num_warnings; /* number of corrupt-data warnings */ | ||
677 | |||
678 | /* These fields point to the table(s) of error message strings. | ||
679 | * An application can change the table pointer to switch to a different | ||
680 | * message list (typically, to change the language in which errors are | ||
681 | * reported). Some applications may wish to add additional error codes | ||
682 | * that will be handled by the JPEG library error mechanism; the second | ||
683 | * table pointer is used for this purpose. | ||
684 | * | ||
685 | * First table includes all errors generated by JPEG library itself. | ||
686 | * Error code 0 is reserved for a "no such error string" message. | ||
687 | */ | ||
688 | const char * const * jpeg_message_table; /* Library errors */ | ||
689 | int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */ | ||
690 | /* Second table can be added by application (see cjpeg/djpeg for example). | ||
691 | * It contains strings numbered first_addon_message..last_addon_message. | ||
692 | */ | ||
693 | const char * const * addon_message_table; /* Non-library errors */ | ||
694 | int first_addon_message;/* code for first string in addon table */ | ||
695 | int last_addon_message;/* code for last string in addon table */ | ||
696 | }; | ||
697 | |||
698 | |||
699 | /* Progress monitor object */ | ||
700 | |||
701 | struct jpeg_progress_mgr { | ||
702 | JMETHOD(void, progress_monitor, (j_common_ptr cinfo)); | ||
703 | |||
704 | long pass_counter; /* work units completed in this pass */ | ||
705 | long pass_limit; /* total number of work units in this pass */ | ||
706 | int completed_passes; /* passes completed so far */ | ||
707 | int total_passes; /* total number of passes expected */ | ||
708 | }; | ||
709 | |||
710 | |||
711 | /* Data destination object for compression */ | ||
712 | |||
713 | struct jpeg_destination_mgr { | ||
714 | JOCTET * next_output_byte;/* => next byte to write in buffer */ | ||
715 | size_t free_in_buffer;/* # of byte spaces remaining in buffer */ | ||
716 | |||
717 | JMETHOD(void, init_destination, (j_compress_ptr cinfo)); | ||
718 | JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo)); | ||
719 | JMETHOD(void, term_destination, (j_compress_ptr cinfo)); | ||
720 | }; | ||
721 | |||
722 | |||
723 | /* Data source object for decompression */ | ||
724 | |||
725 | struct jpeg_source_mgr { | ||
726 | const JOCTET * next_input_byte; /* => next byte to read from buffer */ | ||
727 | size_t bytes_in_buffer;/* # of bytes remaining in buffer */ | ||
728 | |||
729 | JMETHOD(void, init_source, (j_decompress_ptr cinfo)); | ||
730 | JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo)); | ||
731 | JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes)); | ||
732 | JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired)); | ||
733 | JMETHOD(void, term_source, (j_decompress_ptr cinfo)); | ||
734 | }; | ||
735 | |||
736 | |||
737 | /* Memory manager object. | ||
738 | * Allocates "small" objects (a few K total), "large" objects (tens of K), | ||
739 | * and "really big" objects (virtual arrays with backing store if needed). | ||
740 | * The memory manager does not allow individual objects to be freed; rather, | ||
741 | * each created object is assigned to a pool, and whole pools can be freed | ||
742 | * at once. This is faster and more convenient than remembering exactly what | ||
743 | * to free, especially where malloc()/free() are not too speedy. | ||
744 | * NB: alloc routines never return NULL. They exit to error_exit if not | ||
745 | * successful. | ||
746 | */ | ||
747 | |||
748 | #define JPOOL_PERMANENT 0/* lasts until master record is destroyed */ | ||
749 | #define JPOOL_IMAGE 1/* lasts until done with image/datastream */ | ||
750 | #define JPOOL_NUMPOOLS2 | ||
751 | |||
752 | typedef struct jvirt_sarray_control * jvirt_sarray_ptr; | ||
753 | typedef struct jvirt_barray_control * jvirt_barray_ptr; | ||
754 | |||
755 | |||
756 | struct jpeg_memory_mgr { | ||
757 | /* Method pointers */ | ||
758 | JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id, | ||
759 | size_t sizeofobject)); | ||
760 | JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id, | ||
761 | size_t sizeofobject)); | ||
762 | JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id, | ||
763 | JDIMENSION samplesperrow, | ||
764 | JDIMENSION numrows)); | ||
765 | JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id, | ||
766 | JDIMENSION blocksperrow, | ||
767 | JDIMENSION numrows)); | ||
768 | JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo, | ||
769 | int pool_id, | ||
770 | boolean pre_zero, | ||
771 | JDIMENSION samplesperrow, | ||
772 | JDIMENSION numrows, | ||
773 | JDIMENSION maxaccess)); | ||
774 | JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo, | ||
775 | int pool_id, | ||
776 | boolean pre_zero, | ||
777 | JDIMENSION blocksperrow, | ||
778 | JDIMENSION numrows, | ||
779 | JDIMENSION maxaccess)); | ||
780 | JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo)); | ||
781 | JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo, | ||
782 | jvirt_sarray_ptr ptr, | ||
783 | JDIMENSION start_row, | ||
784 | JDIMENSION num_rows, | ||
785 | boolean writable)); | ||
786 | JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo, | ||
787 | jvirt_barray_ptr ptr, | ||
788 | JDIMENSION start_row, | ||
789 | JDIMENSION num_rows, | ||
790 | boolean writable)); | ||
791 | JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id)); | ||
792 | JMETHOD(void, self_destruct, (j_common_ptr cinfo)); | ||
793 | |||
794 | /* Limit on memory allocation for this JPEG object. (Note that this is | ||
795 | * merely advisory, not a guaranteed maximum; it only affects the space | ||
796 | * used for virtual-array buffers.) May be changed by outer application | ||
797 | * after creating the JPEG object. | ||
798 | */ | ||
799 | long max_memory_to_use; | ||
800 | |||
801 | /* Maximum allocation request accepted by alloc_large. */ | ||
802 | long max_alloc_chunk; | ||
803 | }; | ||
804 | |||
805 | |||
806 | /* Routine signature for application-supplied marker processing methods. | ||
807 | * Need not pass marker code since it is stored in cinfo->unread_marker. | ||
808 | */ | ||
809 | typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo)); | ||
810 | |||
811 | |||
812 | /* Declarations for routines called by application. | ||
813 | * The JPP macro hides prototype parameters from compilers that can't cope. | ||
814 | * Note JPP requires double parentheses. | ||
815 | */ | ||
816 | |||
817 | #ifdef HAVE_PROTOTYPES | ||
818 | #define JPP(arglist)arglist | ||
819 | #else | ||
820 | #define JPP(arglist)() | ||
821 | #endif | ||
822 | |||
823 | |||
824 | /* Short forms of external names for systems with brain-damaged linkers. | ||
825 | * We shorten external names to be unique in the first six letters, which | ||
826 | * is good enough for all known systems. | ||
827 | * (If your compiler itself needs names to be unique in less than 15 | ||
828 | * characters, you are out of luck. Get a better compiler.) | ||
829 | */ | ||
830 | |||
831 | #ifdef NEED_SHORT_EXTERNAL_NAMES | ||
832 | #define jpeg_std_error jStdError | ||
833 | #define jpeg_CreateCompressjCreaCompress | ||
834 | #define jpeg_CreateDecompressjCreaDecompress | ||
835 | #define jpeg_destroy_compressjDestCompress | ||
836 | #define jpeg_destroy_decompressjDestDecompress | ||
837 | #define jpeg_stdio_dest jStdDest | ||
838 | #define jpeg_stdio_src jStdSrc | ||
839 | #define jpeg_set_defaultsjSetDefaults | ||
840 | #define jpeg_set_colorspacejSetColorspace | ||
841 | #define jpeg_default_colorspacejDefColorspace | ||
842 | #define jpeg_set_qualityjSetQuality | ||
843 | #define jpeg_set_linear_qualityjSetLQuality | ||
844 | #define jpeg_add_quant_tablejAddQuantTable | ||
845 | #define jpeg_quality_scalingjQualityScaling | ||
846 | #define jpeg_simple_progressionjSimProgress | ||
847 | #define jpeg_suppress_tablesjSuppressTables | ||
848 | #define jpeg_alloc_quant_tablejAlcQTable | ||
849 | #define jpeg_alloc_huff_tablejAlcHTable | ||
850 | #define jpeg_start_compressjStrtCompress | ||
851 | #define jpeg_write_scanlinesjWrtScanlines | ||
852 | #define jpeg_finish_compressjFinCompress | ||
853 | #define jpeg_write_raw_datajWrtRawData | ||
854 | #define jpeg_write_markerjWrtMarker | ||
855 | #define jpeg_write_m_headerjWrtMHeader | ||
856 | #define jpeg_write_m_bytejWrtMByte | ||
857 | #define jpeg_write_tablesjWrtTables | ||
858 | #define jpeg_read_headerjReadHeader | ||
859 | #define jpeg_start_decompressjStrtDecompress | ||
860 | #define jpeg_read_scanlinesjReadScanlines | ||
861 | #define jpeg_finish_decompressjFinDecompress | ||
862 | #define jpeg_read_raw_datajReadRawData | ||
863 | #define jpeg_has_multiple_scansjHasMultScn | ||
864 | #define jpeg_start_outputjStrtOutput | ||
865 | #define jpeg_finish_outputjFinOutput | ||
866 | #define jpeg_input_completejInComplete | ||
867 | #define jpeg_new_colormapjNewCMap | ||
868 | #define jpeg_consume_inputjConsumeInput | ||
869 | #define jpeg_calc_output_dimensionsjCalcDimensions | ||
870 | #define jpeg_save_markersjSaveMarkers | ||
871 | #define jpeg_set_marker_processorjSetMarker | ||
872 | #define jpeg_read_coefficientsjReadCoefs | ||
873 | #define jpeg_write_coefficientsjWrtCoefs | ||
874 | #define jpeg_copy_critical_parametersjCopyCrit | ||
875 | #define jpeg_abort_compressjAbrtCompress | ||
876 | #define jpeg_abort_decompressjAbrtDecompress | ||
877 | #define jpeg_abort jAbort | ||
878 | #define jpeg_destroy jDestroy | ||
879 | #define jpeg_resync_to_restartjResyncRestart | ||
880 | #endif /* NEED_SHORT_EXTERNAL_NAMES */ | ||
881 | |||
882 | |||
883 | /* Default error-management setup */ | ||
884 | EXTERN(struct jpeg_error_mgr *) jpeg_std_error | ||
885 | JPP((struct jpeg_error_mgr * err)); | ||
886 | |||
887 | /* Initialization of JPEG compression objects. | ||
888 | * jpeg_create_compress() and jpeg_create_decompress() are the exported | ||
889 | * names that applications should call. These expand to calls on | ||
890 | * jpeg_CreateCompress and jpeg_CreateDecompress with additional information | ||
891 | * passed for version mismatch checking. | ||
892 | * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx. | ||
893 | */ | ||
894 | #define jpeg_create_compress(cinfo) \ | ||
895 | jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \ | ||
896 | (size_t) sizeof(struct jpeg_compress_struct)) | ||
897 | #define jpeg_create_decompress(cinfo) \ | ||
898 | jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \ | ||
899 | (size_t) sizeof(struct jpeg_decompress_struct)) | ||
900 | EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo, | ||
901 | int version, size_t structsize)); | ||
902 | EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo, | ||
903 | int version, size_t structsize)); | ||
904 | /* Destruction of JPEG compression objects */ | ||
905 | EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo)); | ||
906 | EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo)); | ||
907 | |||
908 | /* Standard data source and destination managers: stdio streams. */ | ||
909 | /* Caller is responsible for opening the file before and closing after. */ | ||
910 | EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile)); | ||
911 | EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile)); | ||
912 | |||
913 | /* Default parameter setup for compression */ | ||
914 | EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo)); | ||
915 | /* Compression parameter setup aids */ | ||
916 | EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo, | ||
917 | J_COLOR_SPACE colorspace)); | ||
918 | EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo)); | ||
919 | EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality, | ||
920 | boolean force_baseline)); | ||
921 | EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo, | ||
922 | int scale_factor, | ||
923 | boolean force_baseline)); | ||
924 | EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl, | ||
925 | const unsigned int *basic_table, | ||
926 | int scale_factor, | ||
927 | boolean force_baseline)); | ||
928 | EXTERN(int) jpeg_quality_scaling JPP((int quality)); | ||
929 | EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo)); | ||
930 | EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo, | ||
931 | boolean suppress)); | ||
932 | EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo)); | ||
933 | EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo)); | ||
934 | |||
935 | /* Main entry points for compression */ | ||
936 | EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo, | ||
937 | boolean write_all_tables)); | ||
938 | EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo, | ||
939 | JSAMPARRAY scanlines, | ||
940 | JDIMENSION num_lines)); | ||
941 | EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo)); | ||
942 | |||
943 | /* Replaces jpeg_write_scanlines when writing raw downsampled data. */ | ||
944 | EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo, | ||
945 | JSAMPIMAGE data, | ||
946 | JDIMENSION num_lines)); | ||
947 | |||
948 | /* Write a special marker. See libjpeg.doc concerning safe usage. */ | ||
949 | EXTERN(void) jpeg_write_marker | ||
950 | JPP((j_compress_ptr cinfo, int marker, | ||
951 | const JOCTET * dataptr, unsigned int datalen)); | ||
952 | /* Same, but piecemeal. */ | ||
953 | EXTERN(void) jpeg_write_m_header | ||
954 | JPP((j_compress_ptr cinfo, int marker, unsigned int datalen)); | ||
955 | EXTERN(void) jpeg_write_m_byte | ||
956 | JPP((j_compress_ptr cinfo, int val)); | ||
957 | |||
958 | /* Alternate compression function: just write an abbreviated table file */ | ||
959 | EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo)); | ||
960 | |||
961 | /* Decompression startup: read start of JPEG datastream to see what's there */ | ||
962 | EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo, | ||
963 | boolean require_image)); | ||
964 | /* Return value is one of: */ | ||
965 | #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ | ||
966 | #define JPEG_HEADER_OK 1 /* Found valid image datastream */ | ||
967 | #define JPEG_HEADER_TABLES_ONLY2 /* Found valid table-specs-only datastream */ | ||
968 | /* If you pass require_image = TRUE (normal case), you need not check for | ||
969 | * a TABLES_ONLY return code; an abbreviated file will cause an error exit. | ||
970 | * JPEG_SUSPENDED is only possible if you use a data source module that can | ||
971 | * give a suspension return (the stdio source module doesn't). | ||
972 | */ | ||
973 | |||
974 | /* Main entry points for decompression */ | ||
975 | EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo)); | ||
976 | EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo, | ||
977 | JSAMPARRAY scanlines, | ||
978 | JDIMENSION max_lines)); | ||
979 | EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo)); | ||
980 | |||
981 | /* Replaces jpeg_read_scanlines when reading raw downsampled data. */ | ||
982 | EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo, | ||
983 | JSAMPIMAGE data, | ||
984 | JDIMENSION max_lines)); | ||
985 | |||
986 | /* Additional entry points for buffered-image mode. */ | ||
987 | EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo)); | ||
988 | EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo, | ||
989 | int scan_number)); | ||
990 | EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo)); | ||
991 | EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo)); | ||
992 | EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo)); | ||
993 | EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo)); | ||
994 | /* Return value is one of: */ | ||
995 | /* #define JPEG_SUSPENDED0 Suspended due to lack of input data */ | ||
996 | #define JPEG_REACHED_SOS1 /* Reached start of new scan */ | ||
997 | #define JPEG_REACHED_EOI2 /* Reached end of image */ | ||
998 | #define JPEG_ROW_COMPLETED3 /* Completed one iMCU row */ | ||
999 | #define JPEG_SCAN_COMPLETED4 /* Completed last iMCU row of a scan */ | ||
1000 | |||
1001 | /* Precalculate output dimensions for current decompression parameters. */ | ||
1002 | EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo)); | ||
1003 | |||
1004 | /* Control saving of COM and APPn markers into marker_list. */ | ||
1005 | EXTERN(void) jpeg_save_markers | ||
1006 | JPP((j_decompress_ptr cinfo, int marker_code, | ||
1007 | unsigned int length_limit)); | ||
1008 | |||
1009 | /* Install a special processing method for COM or APPn markers. */ | ||
1010 | EXTERN(void) jpeg_set_marker_processor | ||
1011 | JPP((j_decompress_ptr cinfo, int marker_code, | ||
1012 | jpeg_marker_parser_method routine)); | ||
1013 | |||
1014 | /* Read or write raw DCT coefficients --- useful for lossless transcoding. */ | ||
1015 | EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo)); | ||
1016 | EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo, | ||
1017 | jvirt_barray_ptr * coef_arrays)); | ||
1018 | EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo, | ||
1019 | j_compress_ptr dstinfo)); | ||
1020 | |||
1021 | /* If you choose to abort compression or decompression before completing | ||
1022 | * jpeg_finish_(de)compress, then you need to clean up to release memory, | ||
1023 | * temporary files, etc. You can just call jpeg_destroy_(de)compress | ||
1024 | * if you're done with the JPEG object, but if you want to clean it up and | ||
1025 | * reuse it, call this: | ||
1026 | */ | ||
1027 | EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo)); | ||
1028 | EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo)); | ||
1029 | |||
1030 | /* Generic versions of jpeg_abort and jpeg_destroy that work on either | ||
1031 | * flavor of JPEG object. These may be more convenient in some places. | ||
1032 | */ | ||
1033 | EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo)); | ||
1034 | EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo)); | ||
1035 | |||
1036 | /* Default restart-marker-resync procedure for use by data source modules */ | ||
1037 | EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, | ||
1038 | int desired)); | ||
1039 | |||
1040 | |||
1041 | /* These marker codes are exported since applications and data source modules | ||
1042 | * are likely to want to use them. | ||
1043 | */ | ||
1044 | |||
1045 | #define JPEG_RST0 0xD0/* RST0 marker code */ | ||
1046 | #define JPEG_EOI 0xD9/* EOI marker code */ | ||
1047 | #define JPEG_APP0 0xE0/* APP0 marker code */ | ||
1048 | #define JPEG_COM 0xFE/* COM marker code */ | ||
1049 | |||
1050 | |||
1051 | /* If we have a brain-damaged compiler that emits warnings (or worse, errors) | ||
1052 | * for structure definitions that are never filled in, keep it quiet by | ||
1053 | * supplying dummy definitions for the various substructures. | ||
1054 | */ | ||
1055 | |||
1056 | #ifdef INCOMPLETE_TYPES_BROKEN | ||
1057 | #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */ | ||
1058 | struct jvirt_sarray_control { long dummy; }; | ||
1059 | struct jvirt_barray_control { long dummy; }; | ||
1060 | struct jpeg_comp_master { long dummy; }; | ||
1061 | struct jpeg_c_main_controller { long dummy; }; | ||
1062 | struct jpeg_c_prep_controller { long dummy; }; | ||
1063 | struct jpeg_c_coef_controller { long dummy; }; | ||
1064 | struct jpeg_marker_writer { long dummy; }; | ||
1065 | struct jpeg_color_converter { long dummy; }; | ||
1066 | struct jpeg_downsampler { long dummy; }; | ||
1067 | struct jpeg_forward_dct { long dummy; }; | ||
1068 | struct jpeg_entropy_encoder { long dummy; }; | ||
1069 | struct jpeg_decomp_master { long dummy; }; | ||
1070 | struct jpeg_d_main_controller { long dummy; }; | ||
1071 | struct jpeg_d_coef_controller { long dummy; }; | ||
1072 | struct jpeg_d_post_controller { long dummy; }; | ||
1073 | struct jpeg_input_controller { long dummy; }; | ||
1074 | struct jpeg_marker_reader { long dummy; }; | ||
1075 | struct jpeg_entropy_decoder { long dummy; }; | ||
1076 | struct jpeg_inverse_dct { long dummy; }; | ||
1077 | struct jpeg_upsampler { long dummy; }; | ||
1078 | struct jpeg_color_deconverter { long dummy; }; | ||
1079 | struct jpeg_color_quantizer { long dummy; }; | ||
1080 | #endif /* JPEG_INTERNALS */ | ||
1081 | #endif /* INCOMPLETE_TYPES_BROKEN */ | ||
1082 | |||
1083 | |||
1084 | /* | ||
1085 | * The JPEG library modules define JPEG_INTERNALS before including this file. | ||
1086 | * The internal structure declarations are read only when that is true. | ||
1087 | * Applications using the library should not include jpegint.h, but may wish | ||
1088 | * to include jerror.h. | ||
1089 | */ | ||
1090 | |||
1091 | #ifdef JPEG_INTERNALS | ||
1092 | #include "jpegint.h" /* fetch private declarations */ | ||
1093 | #include "jerror.h" /* fetch error codes too */ | ||
1094 | #endif | ||
1095 | |||
1096 | #endif /* JPEGLIB_H */ | ||