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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 */ | |
3442c078 | 24 | #include "jconfig.h" /* widely used configuration options */ |
e1929140 RR |
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 | */ | |
e604ac79 | 94 | wxjpeg_boolean sent_table; /* TRUE when table has been output */ |
e1929140 RR |
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 | */ | |
e604ac79 | 110 | wxjpeg_boolean sent_table; /* TRUE when table has been output */ |
e1929140 RR |
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) */ | |
50c375d3 | 131 | |
e1929140 | 132 | /* Remaining fields should be treated as private by applications. */ |
50c375d3 | 133 | |
e1929140 RR |
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 | */ | |
e604ac79 | 160 | wxjpeg_boolean component_needed; /* do we need the value of this component? */ |
e1929140 RR |
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 */\ | |
e604ac79 | 246 | wxjpeg_boolean is_decompressor; /* So common code can tell which is which */\ |
e1929140 RR |
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 */ | |
50c375d3 | 301 | |
e1929140 RR |
302 | JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; |
303 | /* ptrs to coefficient quantization tables, or NULL if not defined */ | |
50c375d3 | 304 | |
e1929140 RR |
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 */ | |
50c375d3 | 308 | |
e1929140 RR |
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 | ||
e604ac79 MW |
320 | wxjpeg_boolean raw_data_in; /* TRUE=caller supplies downsampled data */ |
321 | wxjpeg_boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ | |
322 | wxjpeg_boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ | |
323 | wxjpeg_boolean CCIR601_sampling; /* TRUE=first samples are cosited */ | |
e1929140 RR |
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 | ||
e604ac79 | 337 | wxjpeg_boolean write_JFIF_header; /* should a JFIF marker be written? */ |
e1929140 RR |
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 */ | |
e604ac79 | 347 | wxjpeg_boolean write_Adobe_marker; /* should an Adobe marker be written? */ |
50c375d3 | 348 | |
e1929140 RR |
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 | */ | |
e604ac79 | 363 | wxjpeg_boolean progressive_mode; /* TRUE if scan script uses progressive mode */ |
e1929140 RR |
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 | */ | |
50c375d3 | 373 | |
e1929140 RR |
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 */ | |
50c375d3 | 381 | |
e1929140 RR |
382 | JDIMENSION MCUs_per_row; /* # of MCUs across the image */ |
383 | JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ | |
50c375d3 | 384 | |
e1929140 RR |
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 | ||
e604ac79 MW |
436 | wxjpeg_boolean buffered_image; /* TRUE=multiple output passes */ |
437 | wxjpeg_boolean raw_data_out; /* TRUE=downsampled data wanted */ | |
e1929140 RR |
438 | |
439 | J_DCT_METHOD dct_method; /* IDCT algorithm selector */ | |
e604ac79 MW |
440 | wxjpeg_boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */ |
441 | wxjpeg_boolean do_block_smoothing; /* TRUE=apply interblock smoothing */ | |
e1929140 | 442 | |
e604ac79 | 443 | wxjpeg_boolean quantize_colors; /* TRUE=colormapped output wanted */ |
e1929140 RR |
444 | /* the following are ignored if not quantize_colors: */ |
445 | J_DITHER_MODE dither_mode; /* type of color dithering to use */ | |
e604ac79 | 446 | wxjpeg_boolean two_pass_quantize; /* TRUE=use two-pass color quantization */ |
e1929140 RR |
447 | int desired_number_of_colors; /* max # colors to use in created colormap */ |
448 | /* these are significant only in buffered-image mode: */ | |
e604ac79 MW |
449 | wxjpeg_boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ |
450 | wxjpeg_boolean enable_external_quant;/* enable future use of external colormap */ | |
451 | wxjpeg_boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ | |
e1929140 RR |
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 | ||
e604ac79 MW |
538 | wxjpeg_boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */ |
539 | wxjpeg_boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ | |
e1929140 RR |
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 | */ | |
e604ac79 | 550 | wxjpeg_boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */ |
e1929140 RR |
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 */ | |
e604ac79 | 557 | wxjpeg_boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */ |
e1929140 RR |
558 | UINT8 Adobe_transform; /* Color transform code from Adobe marker */ |
559 | ||
e604ac79 | 560 | wxjpeg_boolean CCIR601_sampling; /* TRUE=first samples are cosited */ |
e1929140 RR |
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)); | |
50c375d3 | 655 | |
e1929140 RR |
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; | |
50c375d3 | 665 | |
e1929140 | 666 | /* Standard state variables for error facility */ |
50c375d3 | 667 | |
e1929140 | 668 | int trace_level; /* max msg_level that will be displayed */ |
50c375d3 | 669 | |
e1929140 RR |
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)); | |
e604ac79 | 718 | JMETHOD(wxjpeg_boolean, empty_output_buffer, (j_compress_ptr cinfo)); |
e1929140 RR |
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)); | |
e604ac79 | 730 | JMETHOD(wxjpeg_boolean, fill_input_buffer, (j_decompress_ptr cinfo)); |
e1929140 | 731 | JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes)); |
e604ac79 | 732 | JMETHOD(wxjpeg_boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired)); |
e1929140 RR |
733 | JMETHOD(void, term_source, (j_decompress_ptr cinfo)); |
734 | }; | |
735 | ||
736 | ||
737 | /* Memory manager object. | |
738 | * Allocates "small" objects (a few K total), "large" objects (tens of K), | |
739 | * and "really big" objects (virtual arrays with backing store if needed). | |
740 | * The memory manager does not allow individual objects to be freed; rather, | |
741 | * each created object is assigned to a pool, and whole pools can be freed | |
742 | * at once. This is faster and more convenient than remembering exactly what | |
743 | * to free, especially where malloc()/free() are not too speedy. | |
744 | * NB: alloc routines never return NULL. They exit to error_exit if not | |
745 | * successful. | |
746 | */ | |
747 | ||
748 | #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */ | |
749 | #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */ | |
750 | #define JPOOL_NUMPOOLS 2 | |
751 | ||
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, | |
e604ac79 | 770 | wxjpeg_boolean pre_zero, |
e1929140 RR |
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, | |
e604ac79 | 776 | wxjpeg_boolean pre_zero, |
e1929140 RR |
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, | |
e604ac79 | 785 | wxjpeg_boolean writable)); |
e1929140 RR |
786 | JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo, |
787 | jvirt_barray_ptr ptr, | |
788 | JDIMENSION start_row, | |
789 | JDIMENSION num_rows, | |
e604ac79 | 790 | wxjpeg_boolean writable)); |
e1929140 RR |
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 | */ | |
e604ac79 | 809 | typedef JMETHOD(wxjpeg_boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo)); |
e1929140 RR |
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. | |
50c375d3 | 827 | * (If your compiler itself needs names to be unique in less than 15 |
e1929140 RR |
828 | * characters, you are out of luck. Get a better compiler.) |
829 | */ | |
830 | ||
831 | #ifdef NEED_SHORT_EXTERNAL_NAMES | |
832 | #define jpeg_std_error jStdError | |
833 | #define jpeg_CreateCompress jCreaCompress | |
834 | #define jpeg_CreateDecompress jCreaDecompress | |
835 | #define jpeg_destroy_compress jDestCompress | |
836 | #define jpeg_destroy_decompress jDestDecompress | |
837 | #define jpeg_stdio_dest jStdDest | |
838 | #define jpeg_stdio_src jStdSrc | |
839 | #define jpeg_set_defaults jSetDefaults | |
840 | #define jpeg_set_colorspace jSetColorspace | |
841 | #define jpeg_default_colorspace jDefColorspace | |
842 | #define jpeg_set_quality jSetQuality | |
843 | #define jpeg_set_linear_quality jSetLQuality | |
844 | #define jpeg_add_quant_table jAddQuantTable | |
845 | #define jpeg_quality_scaling jQualityScaling | |
846 | #define jpeg_simple_progression jSimProgress | |
847 | #define jpeg_suppress_tables jSuppressTables | |
848 | #define jpeg_alloc_quant_table jAlcQTable | |
849 | #define jpeg_alloc_huff_table jAlcHTable | |
850 | #define jpeg_start_compress jStrtCompress | |
851 | #define jpeg_write_scanlines jWrtScanlines | |
852 | #define jpeg_finish_compress jFinCompress | |
853 | #define jpeg_write_raw_data jWrtRawData | |
854 | #define jpeg_write_marker jWrtMarker | |
855 | #define jpeg_write_m_header jWrtMHeader | |
856 | #define jpeg_write_m_byte jWrtMByte | |
857 | #define jpeg_write_tables jWrtTables | |
858 | #define jpeg_read_header jReadHeader | |
859 | #define jpeg_start_decompress jStrtDecompress | |
860 | #define jpeg_read_scanlines jReadScanlines | |
861 | #define jpeg_finish_decompress jFinDecompress | |
862 | #define jpeg_read_raw_data jReadRawData | |
863 | #define jpeg_has_multiple_scans jHasMultScn | |
864 | #define jpeg_start_output jStrtOutput | |
865 | #define jpeg_finish_output jFinOutput | |
866 | #define jpeg_input_complete jInComplete | |
867 | #define jpeg_new_colormap jNewCMap | |
868 | #define jpeg_consume_input jConsumeInput | |
869 | #define jpeg_calc_output_dimensions jCalcDimensions | |
870 | #define jpeg_save_markers jSaveMarkers | |
871 | #define jpeg_set_marker_processor jSetMarker | |
872 | #define jpeg_read_coefficients jReadCoefs | |
873 | #define jpeg_write_coefficients jWrtCoefs | |
874 | #define jpeg_copy_critical_parameters jCopyCrit | |
875 | #define jpeg_abort_compress jAbrtCompress | |
876 | #define jpeg_abort_decompress jAbrtDecompress | |
877 | #define jpeg_abort jAbort | |
878 | #define jpeg_destroy jDestroy | |
879 | #define jpeg_resync_to_restart jResyncRestart | |
880 | #endif /* NEED_SHORT_EXTERNAL_NAMES */ | |
881 | ||
882 | ||
883 | /* Default error-management setup */ | |
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, | |
e604ac79 | 920 | wxjpeg_boolean force_baseline)); |
e1929140 RR |
921 | EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo, |
922 | int scale_factor, | |
e604ac79 | 923 | wxjpeg_boolean force_baseline)); |
e1929140 RR |
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, | |
e604ac79 | 927 | wxjpeg_boolean force_baseline)); |
e1929140 RR |
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, | |
e604ac79 | 931 | wxjpeg_boolean suppress)); |
e1929140 RR |
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, | |
e604ac79 | 937 | wxjpeg_boolean write_all_tables)); |
e1929140 RR |
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, | |
e604ac79 | 963 | wxjpeg_boolean require_image)); |
e1929140 RR |
964 | /* Return value is one of: */ |
965 | #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ | |
966 | #define JPEG_HEADER_OK 1 /* Found valid image datastream */ | |
967 | #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */ | |
968 | /* If you pass require_image = TRUE (normal case), you need not check for | |
969 | * a TABLES_ONLY return code; an abbreviated file will cause an error exit. | |
970 | * JPEG_SUSPENDED is only possible if you use a data source module that can | |
971 | * give a suspension return (the stdio source module doesn't). | |
972 | */ | |
973 | ||
974 | /* Main entry points for decompression */ | |
e604ac79 | 975 | EXTERN(wxjpeg_boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo)); |
e1929140 RR |
976 | EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo, |
977 | JSAMPARRAY scanlines, | |
978 | JDIMENSION max_lines)); | |
e604ac79 | 979 | EXTERN(wxjpeg_boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo)); |
e1929140 RR |
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. */ | |
e604ac79 MW |
987 | EXTERN(wxjpeg_boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo)); |
988 | EXTERN(wxjpeg_boolean) jpeg_start_output JPP((j_decompress_ptr cinfo, | |
e1929140 | 989 | int scan_number)); |
e604ac79 MW |
990 | EXTERN(wxjpeg_boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo)); |
991 | EXTERN(wxjpeg_boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo)); | |
e1929140 RR |
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_SUSPENDED 0 Suspended due to lack of input data */ | |
996 | #define JPEG_REACHED_SOS 1 /* Reached start of new scan */ | |
997 | #define JPEG_REACHED_EOI 2 /* Reached end of image */ | |
998 | #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */ | |
999 | #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */ | |
1000 | ||
1001 | /* Precalculate output dimensions for current decompression parameters. */ | |
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 */ | |
e604ac79 | 1037 | EXTERN(wxjpeg_boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, |
e1929140 RR |
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 */ |