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0.4.16-dev-306-g647d351
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Examples
jmorecfg.h
Go to the documentation of this file.
1
/*
2
* jmorecfg.h
3
*
4
* Copyright (C) 1991-1997, Thomas G. Lane.
5
* Modified 1997-2013 by Guido Vollbeding.
6
* This file is part of the Independent JPEG Group's software.
7
* For conditions of distribution and use, see the accompanying README file.
8
*
9
* This file contains additional configuration options that customize the
10
* JPEG software for special applications or support machine-dependent
11
* optimizations. Most users will not need to touch this file.
12
*/
13
14
15
/*
16
* Define BITS_IN_JSAMPLE as either
17
* 8 for 8-bit sample values (the usual setting)
18
* 9 for 9-bit sample values
19
* 10 for 10-bit sample values
20
* 11 for 11-bit sample values
21
* 12 for 12-bit sample values
22
* Only 8, 9, 10, 11, and 12 bits sample data precision are supported for
23
* full-feature DCT processing. Further depths up to 16-bit may be added
24
* later for the lossless modes of operation.
25
* Run-time selection and conversion of data precision will be added later
26
* and are currently not supported, sorry.
27
* Exception: The transcoding part (jpegtran) supports all settings in a
28
* single instance, since it operates on the level of DCT coefficients and
29
* not sample values. The DCT coefficients are of the same type (16 bits)
30
* in all cases (see below).
31
*/
32
33
#define BITS_IN_JSAMPLE 8
/* use 8, 9, 10, 11, or 12 */
34
35
36
/*
37
* Maximum number of components (color channels) allowed in JPEG image.
38
* To meet the letter of the JPEG spec, set this to 255. However, darn
39
* few applications need more than 4 channels (maybe 5 for CMYK + alpha
40
* mask). We recommend 10 as a reasonable compromise; use 4 if you are
41
* really short on memory. (Each allowed component costs a hundred or so
42
* bytes of storage, whether actually used in an image or not.)
43
*/
44
45
#define MAX_COMPONENTS 10
/* maximum number of image components */
46
47
48
/*
49
* Basic data types.
50
* You may need to change these if you have a machine with unusual data
51
* type sizes; for example, "char" not 8 bits, "short" not 16 bits,
52
* or "long" not 32 bits. We don't care whether "int" is 16 or 32 bits,
53
* but it had better be at least 16.
54
*/
55
56
/* Representation of a single sample (pixel element value).
57
* We frequently allocate large arrays of these, so it's important to keep
58
* them small. But if you have memory to burn and access to char or short
59
* arrays is very slow on your hardware, you might want to change these.
60
*/
61
62
#if BITS_IN_JSAMPLE == 8
63
/* JSAMPLE should be the smallest type that will hold the values 0..255.
64
* You can use a signed char by having GETJSAMPLE mask it with 0xFF.
65
*/
66
67
#ifdef HAVE_UNSIGNED_CHAR
68
69
typedef
unsigned
char
JSAMPLE
;
70
#define GETJSAMPLE(value) ((int) (value))
71
72
#else
/* not HAVE_UNSIGNED_CHAR */
73
74
typedef
char
JSAMPLE
;
75
#ifdef CHAR_IS_UNSIGNED
76
#define GETJSAMPLE(value) ((int) (value))
77
#else
78
#define GETJSAMPLE(value) ((int) (value) & 0xFF)
79
#endif
/* CHAR_IS_UNSIGNED */
80
81
#endif
/* HAVE_UNSIGNED_CHAR */
82
83
#define MAXJSAMPLE 255
84
#define CENTERJSAMPLE 128
85
86
#endif
/* BITS_IN_JSAMPLE == 8 */
87
88
89
#if BITS_IN_JSAMPLE == 9
90
/* JSAMPLE should be the smallest type that will hold the values 0..511.
91
* On nearly all machines "short" will do nicely.
92
*/
93
94
typedef
short
JSAMPLE
;
95
#define GETJSAMPLE(value) ((int) (value))
96
97
#define MAXJSAMPLE 511
98
#define CENTERJSAMPLE 256
99
100
#endif
/* BITS_IN_JSAMPLE == 9 */
101
102
103
#if BITS_IN_JSAMPLE == 10
104
/* JSAMPLE should be the smallest type that will hold the values 0..1023.
105
* On nearly all machines "short" will do nicely.
106
*/
107
108
typedef
short
JSAMPLE
;
109
#define GETJSAMPLE(value) ((int) (value))
110
111
#define MAXJSAMPLE 1023
112
#define CENTERJSAMPLE 512
113
114
#endif
/* BITS_IN_JSAMPLE == 10 */
115
116
117
#if BITS_IN_JSAMPLE == 11
118
/* JSAMPLE should be the smallest type that will hold the values 0..2047.
119
* On nearly all machines "short" will do nicely.
120
*/
121
122
typedef
short
JSAMPLE
;
123
#define GETJSAMPLE(value) ((int) (value))
124
125
#define MAXJSAMPLE 2047
126
#define CENTERJSAMPLE 1024
127
128
#endif
/* BITS_IN_JSAMPLE == 11 */
129
130
131
#if BITS_IN_JSAMPLE == 12
132
/* JSAMPLE should be the smallest type that will hold the values 0..4095.
133
* On nearly all machines "short" will do nicely.
134
*/
135
136
typedef
short
JSAMPLE
;
137
#define GETJSAMPLE(value) ((int) (value))
138
139
#define MAXJSAMPLE 4095
140
#define CENTERJSAMPLE 2048
141
142
#endif
/* BITS_IN_JSAMPLE == 12 */
143
144
145
/* Representation of a DCT frequency coefficient.
146
* This should be a signed value of at least 16 bits; "short" is usually OK.
147
* Again, we allocate large arrays of these, but you can change to int
148
* if you have memory to burn and "short" is really slow.
149
*/
150
151
typedef
short
JCOEF
;
152
153
154
/* Compressed datastreams are represented as arrays of JOCTET.
155
* These must be EXACTLY 8 bits wide, at least once they are written to
156
* external storage. Note that when using the stdio data source/destination
157
* managers, this is also the data type passed to fread/fwrite.
158
*/
159
160
#ifdef HAVE_UNSIGNED_CHAR
161
162
typedef
unsigned
char
JOCTET
;
163
#define GETJOCTET(value) (value)
164
165
#else
/* not HAVE_UNSIGNED_CHAR */
166
167
typedef
char
JOCTET
;
168
#ifdef CHAR_IS_UNSIGNED
169
#define GETJOCTET(value) (value)
170
#else
171
#define GETJOCTET(value) ((value) & 0xFF)
172
#endif
/* CHAR_IS_UNSIGNED */
173
174
#endif
/* HAVE_UNSIGNED_CHAR */
175
176
177
/* These typedefs are used for various table entries and so forth.
178
* They must be at least as wide as specified; but making them too big
179
* won't cost a huge amount of memory, so we don't provide special
180
* extraction code like we did for JSAMPLE. (In other words, these
181
* typedefs live at a different point on the speed/space tradeoff curve.)
182
*/
183
184
/* UINT8 must hold at least the values 0..255. */
185
186
#ifdef HAVE_UNSIGNED_CHAR
187
typedef
unsigned
char
UINT8
;
188
#else
/* not HAVE_UNSIGNED_CHAR */
189
#ifdef CHAR_IS_UNSIGNED
190
typedef
char
UINT8
;
191
#else
/* not CHAR_IS_UNSIGNED */
192
typedef
short
UINT8
;
193
#endif
/* CHAR_IS_UNSIGNED */
194
#endif
/* HAVE_UNSIGNED_CHAR */
195
196
/* UINT16 must hold at least the values 0..65535. */
197
198
#ifdef HAVE_UNSIGNED_SHORT
199
typedef
unsigned
short
UINT16
;
200
#else
/* not HAVE_UNSIGNED_SHORT */
201
typedef
unsigned
int
UINT16
;
202
#endif
/* HAVE_UNSIGNED_SHORT */
203
204
/* INT16 must hold at least the values -32768..32767. */
205
206
#ifndef XMD_H
/* X11/xmd.h correctly defines INT16 */
207
typedef
short
INT16
;
208
#endif
209
210
/* INT32 must hold at least signed 32-bit values. */
211
212
#ifndef XMD_H
/* X11/xmd.h correctly defines INT32 */
213
#ifndef _BASETSD_H_
/* Microsoft defines it in basetsd.h */
214
#ifndef _BASETSD_H
/* MinGW is slightly different */
215
#ifndef QGLOBAL_H
/* Qt defines it in qglobal.h */
216
typedef
long
INT32
;
217
#endif
218
#endif
219
#endif
220
#endif
221
222
/* Datatype used for image dimensions. The JPEG standard only supports
223
* images up to 64K*64K due to 16-bit fields in SOF markers. Therefore
224
* "unsigned int" is sufficient on all machines. However, if you need to
225
* handle larger images and you don't mind deviating from the spec, you
226
* can change this datatype.
227
*/
228
229
typedef
unsigned
int
JDIMENSION
;
230
231
#define JPEG_MAX_DIMENSION 65500L
/* a tad under 64K to prevent overflows */
232
233
234
/* These macros are used in all function definitions and extern declarations.
235
* You could modify them if you need to change function linkage conventions;
236
* in particular, you'll need to do that to make the library a Windows DLL.
237
* Another application is to make all functions global for use with debuggers
238
* or code profilers that require it.
239
*/
240
241
#ifdef _WIN32
242
# if defined(ALL_STATIC)
243
# if defined(JPEG_DLL)
244
# undef JPEG_DLL
245
# endif
246
# if !defined(JPEG_STATIC)
247
# define JPEG_STATIC
248
# endif
249
# endif
250
# if defined(JPEG_DLL)
251
# if defined(JPEG_STATIC)
252
# undef JPEG_STATIC
253
# endif
254
# endif
255
# if defined(JPEG_DLL)
256
/* building a DLL */
257
# define JPEG_IMPEXP __declspec(dllexport)
258
# elif defined(JPEG_STATIC)
259
/* building or linking to a static library */
260
# define JPEG_IMPEXP
261
# else
262
/* linking to the DLL */
263
# define JPEG_IMPEXP __declspec(dllimport)
264
# endif
265
# if !defined(JPEG_API)
266
# define JPEG_API __cdecl
267
# endif
268
/* The only remaining magic that is necessary for cygwin */
269
#elif defined(__CYGWIN__)
270
# if !defined(JPEG_IMPEXP)
271
# define JPEG_IMPEXP
272
# endif
273
# if !defined(JPEG_API)
274
# define JPEG_API __cdecl
275
# endif
276
#endif
277
278
/* Ensure our magic doesn't hurt other platforms */
279
#if !defined(JPEG_IMPEXP)
280
# define JPEG_IMPEXP
281
#endif
282
#if !defined(JPEG_API)
283
# define JPEG_API
284
#endif
285
286
/* a function called through method pointers: */
287
#define METHODDEF(type) static type
288
/* a function used only in its module: */
289
#define LOCAL(type) static type
290
/* a function referenced thru EXTERNs: */
291
#define GLOBAL(type) type JPEG_API
292
/* a reference to a GLOBAL function: */
293
#ifndef EXTERN
294
# define EXTERN(type) extern JPEG_IMPEXP type JPEG_API
295
/* a reference to a "GLOBAL" function exported by sourcefiles of utility progs */
296
#endif
/* EXTERN */
297
298
299
/* This macro is used to declare a "method", that is, a function pointer.
300
* We want to supply prototype parameters if the compiler can cope.
301
* Note that the arglist parameter must be parenthesized!
302
* Again, you can customize this if you need special linkage keywords.
303
*/
304
305
#ifdef HAVE_PROTOTYPES
306
#define JMETHOD(type,methodname,arglist) type (*methodname) arglist
307
#else
308
#define JMETHOD(type,methodname,arglist) type (*methodname) ()
309
#endif
310
311
312
/* The noreturn type identifier is used to declare functions
313
* which cannot return.
314
* Compilers can thus create more optimized code and perform
315
* better checks for warnings and errors.
316
* Static analyzer tools can make improved inferences about
317
* execution paths and are prevented from giving false alerts.
318
*
319
* Unfortunately, the proposed specifications of corresponding
320
* extensions in the Dec 2011 ISO C standard revision (C11),
321
* GCC, MSVC, etc. are not viable.
322
* Thus we introduce a user defined type to declare noreturn
323
* functions at least for clarity. A proper compiler would
324
* have a suitable noreturn type to match in place of void.
325
*/
326
327
#ifndef HAVE_NORETURN_T
328
typedef
void
noreturn_t
;
329
#endif
330
331
332
/* Here is the pseudo-keyword for declaring pointers that must be "far"
333
* on 80x86 machines. Most of the specialized coding for 80x86 is handled
334
* by just saying "FAR *" where such a pointer is needed. In a few places
335
* explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
336
*/
337
338
#ifndef FAR
339
#ifdef NEED_FAR_POINTERS
340
#define FAR far
341
#else
342
#define FAR
343
#endif
344
#endif
345
346
347
/*
348
* On a few systems, type boolean and/or its values FALSE, TRUE may appear
349
* in standard header files. Or you may have conflicts with application-
350
* specific header files that you want to include together with these files.
351
* Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
352
*/
353
354
#ifndef HAVE_BOOLEAN
355
#if defined FALSE || defined TRUE || defined QGLOBAL_H
356
/* Qt3 defines FALSE and TRUE as "const" variables in qglobal.h */
357
typedef
int
boolean
;
358
#ifndef FALSE
/* in case these macros already exist */
359
#define FALSE 0
/* values of boolean */
360
#endif
361
#ifndef TRUE
362
#define TRUE 1
363
#endif
364
#else
365
typedef
enum
{
FALSE
= 0,
TRUE
= 1 }
boolean
;
366
#endif
367
#endif
368
369
370
/*
371
* The remaining options affect code selection within the JPEG library,
372
* but they don't need to be visible to most applications using the library.
373
* To minimize application namespace pollution, the symbols won't be
374
* defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
375
*/
376
377
#ifdef JPEG_INTERNALS
378
#define JPEG_INTERNAL_OPTIONS
379
#endif
380
381
#ifdef JPEG_INTERNAL_OPTIONS
382
383
384
/*
385
* These defines indicate whether to include various optional functions.
386
* Undefining some of these symbols will produce a smaller but less capable
387
* library. Note that you can leave certain source files out of the
388
* compilation/linking process if you've #undef'd the corresponding symbols.
389
* (You may HAVE to do that if your compiler doesn't like null source files.)
390
*/
391
392
/* Capability options common to encoder and decoder: */
393
394
#define DCT_ISLOW_SUPPORTED
/* slow but accurate integer algorithm */
395
#define DCT_IFAST_SUPPORTED
/* faster, less accurate integer method */
396
#define DCT_FLOAT_SUPPORTED
/* floating-point: accurate, fast on fast HW */
397
398
/* Encoder capability options: */
399
400
#define C_ARITH_CODING_SUPPORTED
/* Arithmetic coding back end? */
401
#define C_MULTISCAN_FILES_SUPPORTED
/* Multiple-scan JPEG files? */
402
#define C_PROGRESSIVE_SUPPORTED
/* Progressive JPEG? (Requires MULTISCAN)*/
403
#define DCT_SCALING_SUPPORTED
/* Input rescaling via DCT? (Requires DCT_ISLOW)*/
404
#define ENTROPY_OPT_SUPPORTED
/* Optimization of entropy coding parms? */
405
/* Note: if you selected more than 8-bit data precision, it is dangerous to
406
* turn off ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only
407
* good for 8-bit precision, so arithmetic coding is recommended for higher
408
* precision. The Huffman encoder normally uses entropy optimization to
409
* compute usable tables for higher precision. Otherwise, you'll have to
410
* supply different default Huffman tables.
411
* The exact same statements apply for progressive JPEG: the default tables
412
* don't work for progressive mode. (This may get fixed, however.)
413
*/
414
#define INPUT_SMOOTHING_SUPPORTED
/* Input image smoothing option? */
415
416
/* Decoder capability options: */
417
418
#define D_ARITH_CODING_SUPPORTED
/* Arithmetic coding back end? */
419
#define D_MULTISCAN_FILES_SUPPORTED
/* Multiple-scan JPEG files? */
420
#define D_PROGRESSIVE_SUPPORTED
/* Progressive JPEG? (Requires MULTISCAN)*/
421
#define IDCT_SCALING_SUPPORTED
/* Output rescaling via IDCT? (Requires DCT_ISLOW)*/
422
#define SAVE_MARKERS_SUPPORTED
/* jpeg_save_markers() needed? */
423
#define BLOCK_SMOOTHING_SUPPORTED
/* Block smoothing? (Progressive only) */
424
#undef UPSAMPLE_SCALING_SUPPORTED
/* Output rescaling at upsample stage? */
425
#define UPSAMPLE_MERGING_SUPPORTED
/* Fast path for sloppy upsampling? */
426
#define QUANT_1PASS_SUPPORTED
/* 1-pass color quantization? */
427
#define QUANT_2PASS_SUPPORTED
/* 2-pass color quantization? */
428
429
/* more capability options later, no doubt */
430
431
432
/*
433
* Ordering of RGB data in scanlines passed to or from the application.
434
* If your application wants to deal with data in the order B,G,R, just
435
* change these macros. You can also deal with formats such as R,G,B,X
436
* (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing
437
* the offsets will also change the order in which colormap data is organized.
438
* RESTRICTIONS:
439
* 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
440
* 2. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
441
* is not 3 (they don't understand about dummy color components!). So you
442
* can't use color quantization if you change that value.
443
*/
444
445
#define RGB_RED 0
/* Offset of Red in an RGB scanline element */
446
#define RGB_GREEN 1
/* Offset of Green */
447
#define RGB_BLUE 2
/* Offset of Blue */
448
#define RGB_PIXELSIZE 3
/* JSAMPLEs per RGB scanline element */
449
450
451
/* Definitions for speed-related optimizations. */
452
453
454
/* If your compiler supports inline functions, define INLINE
455
* as the inline keyword; otherwise define it as empty.
456
*/
457
458
#ifndef INLINE
459
#ifdef __GNUC__
/* for instance, GNU C knows about inline */
460
#define INLINE __inline__
461
#endif
462
#ifndef INLINE
463
#define INLINE
/* default is to define it as empty */
464
#endif
465
#endif
466
467
468
/* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
469
* two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER
470
* as short on such a machine. MULTIPLIER must be at least 16 bits wide.
471
*/
472
473
#ifndef MULTIPLIER
474
#define MULTIPLIER int
/* type for fastest integer multiply */
475
#endif
476
477
478
/* FAST_FLOAT should be either float or double, whichever is done faster
479
* by your compiler. (Note that this type is only used in the floating point
480
* DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
481
* Typically, float is faster in ANSI C compilers, while double is faster in
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* pre-ANSI compilers (because they insist on converting to double anyway).
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* The code below therefore chooses float if we have ANSI-style prototypes.
484
*/
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486
#ifndef FAST_FLOAT
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#ifdef HAVE_PROTOTYPES
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#define FAST_FLOAT float
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#else
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#define FAST_FLOAT double
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#endif
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#endif
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#endif
/* JPEG_INTERNAL_OPTIONS */
JDIMENSION
unsigned int JDIMENSION
Definition:
jmorecfg.h:229
INT32
long INT32
Definition:
jmorecfg.h:216
JOCTET
char JOCTET
Definition:
jmorecfg.h:167
JSAMPLE
char JSAMPLE
Definition:
jmorecfg.h:74
INT16
short INT16
Definition:
jmorecfg.h:207
boolean
boolean
Definition:
jmorecfg.h:365
FALSE
@ FALSE
Definition:
jmorecfg.h:365
TRUE
@ TRUE
Definition:
jmorecfg.h:365
UINT16
unsigned int UINT16
Definition:
jmorecfg.h:201
noreturn_t
void noreturn_t
Definition:
jmorecfg.h:328
UINT8
short UINT8
Definition:
jmorecfg.h:192
JCOEF
short JCOEF
Definition:
jmorecfg.h:151
sdk
include
reactos
libs
libjpeg
jmorecfg.h
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