/[pcsx2_0.9.7]/trunk/3rdparty/libjpeg/jmorecfg.h
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Contents of /trunk/3rdparty/libjpeg/jmorecfg.h

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Revision 10 - (show annotations) (download)
Mon Sep 6 11:40:06 2010 UTC (9 years, 10 months ago) by william
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exported r3113 from ./upstream/trunk
1 /*
2 * jmorecfg.h
3 *
4 * Copyright (C) 1991-1997, Thomas G. Lane.
5 * Modified 1997-2009 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 * 12 for 12-bit sample values
19 * Only 8 and 12 are legal data precisions for lossy JPEG according to the
20 * JPEG standard, and the IJG code does not support anything else!
21 * We do not support run-time selection of data precision, sorry.
22 */
23
24 #define BITS_IN_JSAMPLE 8 /* use 8 or 12 */
25
26
27 /*
28 * Maximum number of components (color channels) allowed in JPEG image.
29 * To meet the letter of the JPEG spec, set this to 255. However, darn
30 * few applications need more than 4 channels (maybe 5 for CMYK + alpha
31 * mask). We recommend 10 as a reasonable compromise; use 4 if you are
32 * really short on memory. (Each allowed component costs a hundred or so
33 * bytes of storage, whether actually used in an image or not.)
34 */
35
36 #define MAX_COMPONENTS 10 /* maximum number of image components */
37
38
39 /*
40 * Basic data types.
41 * You may need to change these if you have a machine with unusual data
42 * type sizes; for example, "char" not 8 bits, "short" not 16 bits,
43 * or "long" not 32 bits. We don't care whether "int" is 16 or 32 bits,
44 * but it had better be at least 16.
45 */
46
47 /* Representation of a single sample (pixel element value).
48 * We frequently allocate large arrays of these, so it's important to keep
49 * them small. But if you have memory to burn and access to char or short
50 * arrays is very slow on your hardware, you might want to change these.
51 */
52
53 #if BITS_IN_JSAMPLE == 8
54 /* JSAMPLE should be the smallest type that will hold the values 0..255.
55 * You can use a signed char by having GETJSAMPLE mask it with 0xFF.
56 */
57
58 #ifdef HAVE_UNSIGNED_CHAR
59
60 typedef unsigned char JSAMPLE;
61 #define GETJSAMPLE(value) ((int) (value))
62
63 #else /* not HAVE_UNSIGNED_CHAR */
64
65 typedef char JSAMPLE;
66 #ifdef CHAR_IS_UNSIGNED
67 #define GETJSAMPLE(value) ((int) (value))
68 #else
69 #define GETJSAMPLE(value) ((int) (value) & 0xFF)
70 #endif /* CHAR_IS_UNSIGNED */
71
72 #endif /* HAVE_UNSIGNED_CHAR */
73
74 #define MAXJSAMPLE 255
75 #define CENTERJSAMPLE 128
76
77 #endif /* BITS_IN_JSAMPLE == 8 */
78
79
80 #if BITS_IN_JSAMPLE == 12
81 /* JSAMPLE should be the smallest type that will hold the values 0..4095.
82 * On nearly all machines "short" will do nicely.
83 */
84
85 typedef short JSAMPLE;
86 #define GETJSAMPLE(value) ((int) (value))
87
88 #define MAXJSAMPLE 4095
89 #define CENTERJSAMPLE 2048
90
91 #endif /* BITS_IN_JSAMPLE == 12 */
92
93
94 /* Representation of a DCT frequency coefficient.
95 * This should be a signed value of at least 16 bits; "short" is usually OK.
96 * Again, we allocate large arrays of these, but you can change to int
97 * if you have memory to burn and "short" is really slow.
98 */
99
100 typedef short JCOEF;
101
102
103 /* Compressed datastreams are represented as arrays of JOCTET.
104 * These must be EXACTLY 8 bits wide, at least once they are written to
105 * external storage. Note that when using the stdio data source/destination
106 * managers, this is also the data type passed to fread/fwrite.
107 */
108
109 #ifdef HAVE_UNSIGNED_CHAR
110
111 typedef unsigned char JOCTET;
112 #define GETJOCTET(value) (value)
113
114 #else /* not HAVE_UNSIGNED_CHAR */
115
116 typedef char JOCTET;
117 #ifdef CHAR_IS_UNSIGNED
118 #define GETJOCTET(value) (value)
119 #else
120 #define GETJOCTET(value) ((value) & 0xFF)
121 #endif /* CHAR_IS_UNSIGNED */
122
123 #endif /* HAVE_UNSIGNED_CHAR */
124
125
126 /* These typedefs are used for various table entries and so forth.
127 * They must be at least as wide as specified; but making them too big
128 * won't cost a huge amount of memory, so we don't provide special
129 * extraction code like we did for JSAMPLE. (In other words, these
130 * typedefs live at a different point on the speed/space tradeoff curve.)
131 */
132
133 /* UINT8 must hold at least the values 0..255. */
134
135 #ifdef HAVE_UNSIGNED_CHAR
136 typedef unsigned char UINT8;
137 #else /* not HAVE_UNSIGNED_CHAR */
138 #ifdef CHAR_IS_UNSIGNED
139 typedef char UINT8;
140 #else /* not CHAR_IS_UNSIGNED */
141 typedef short UINT8;
142 #endif /* CHAR_IS_UNSIGNED */
143 #endif /* HAVE_UNSIGNED_CHAR */
144
145 /* UINT16 must hold at least the values 0..65535. */
146
147 #ifdef HAVE_UNSIGNED_SHORT
148 typedef unsigned short UINT16;
149 #else /* not HAVE_UNSIGNED_SHORT */
150 typedef unsigned int UINT16;
151 #endif /* HAVE_UNSIGNED_SHORT */
152
153 /* INT16 must hold at least the values -32768..32767. */
154
155 #ifndef XMD_H /* X11/xmd.h correctly defines INT16 */
156 typedef short INT16;
157 #endif
158
159 /* INT32 must hold at least signed 32-bit values. */
160
161 #ifndef XMD_H /* X11/xmd.h correctly defines INT32 */
162 #ifndef _BASETSD_H_ /* Microsoft defines it in basetsd.h */
163 #ifndef QGLOBAL_H /* Qt defines it in qglobal.h */
164 typedef long INT32;
165 #endif
166 #endif
167 #endif
168
169 /* Datatype used for image dimensions. The JPEG standard only supports
170 * images up to 64K*64K due to 16-bit fields in SOF markers. Therefore
171 * "unsigned int" is sufficient on all machines. However, if you need to
172 * handle larger images and you don't mind deviating from the spec, you
173 * can change this datatype.
174 */
175
176 typedef unsigned int JDIMENSION;
177
178 #define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */
179
180
181 /* These macros are used in all function definitions and extern declarations.
182 * You could modify them if you need to change function linkage conventions;
183 * in particular, you'll need to do that to make the library a Windows DLL.
184 * Another application is to make all functions global for use with debuggers
185 * or code profilers that require it.
186 */
187
188 /* a function called through method pointers: */
189 #define METHODDEF(type) static type
190 /* a function used only in its module: */
191 #define LOCAL(type) static type
192 /* a function referenced thru EXTERNs: */
193 #define GLOBAL(type) type
194 /* a reference to a GLOBAL function: */
195 #define EXTERN(type) extern type
196
197
198 /* This macro is used to declare a "method", that is, a function pointer.
199 * We want to supply prototype parameters if the compiler can cope.
200 * Note that the arglist parameter must be parenthesized!
201 * Again, you can customize this if you need special linkage keywords.
202 */
203
204 #ifdef HAVE_PROTOTYPES
205 #define JMETHOD(type,methodname,arglist) type (*methodname) arglist
206 #else
207 #define JMETHOD(type,methodname,arglist) type (*methodname) ()
208 #endif
209
210
211 /* Here is the pseudo-keyword for declaring pointers that must be "far"
212 * on 80x86 machines. Most of the specialized coding for 80x86 is handled
213 * by just saying "FAR *" where such a pointer is needed. In a few places
214 * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
215 */
216
217 #ifndef FAR
218 #ifdef NEED_FAR_POINTERS
219 #define FAR far
220 #else
221 #define FAR
222 #endif
223 #endif
224
225
226 /*
227 * On a few systems, type boolean and/or its values FALSE, TRUE may appear
228 * in standard header files. Or you may have conflicts with application-
229 * specific header files that you want to include together with these files.
230 * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
231 */
232
233 #ifndef HAVE_BOOLEAN
234 typedef int boolean;
235 #endif
236 #ifndef FALSE /* in case these macros already exist */
237 #define FALSE 0 /* values of boolean */
238 #endif
239 #ifndef TRUE
240 #define TRUE 1
241 #endif
242
243
244 /*
245 * The remaining options affect code selection within the JPEG library,
246 * but they don't need to be visible to most applications using the library.
247 * To minimize application namespace pollution, the symbols won't be
248 * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
249 */
250
251 #ifdef JPEG_INTERNALS
252 #define JPEG_INTERNAL_OPTIONS
253 #endif
254
255 #ifdef JPEG_INTERNAL_OPTIONS
256
257
258 /*
259 * These defines indicate whether to include various optional functions.
260 * Undefining some of these symbols will produce a smaller but less capable
261 * library. Note that you can leave certain source files out of the
262 * compilation/linking process if you've #undef'd the corresponding symbols.
263 * (You may HAVE to do that if your compiler doesn't like null source files.)
264 */
265
266 /* Capability options common to encoder and decoder: */
267
268 #define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */
269 #define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */
270 #define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */
271
272 /* Encoder capability options: */
273
274 #define C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
275 #define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
276 #define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
277 #define DCT_SCALING_SUPPORTED /* Input rescaling via DCT? (Requires DCT_ISLOW)*/
278 #define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */
279 /* Note: if you selected 12-bit data precision, it is dangerous to turn off
280 * ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit
281 * precision, so jchuff.c normally uses entropy optimization to compute
282 * usable tables for higher precision. If you don't want to do optimization,
283 * you'll have to supply different default Huffman tables.
284 * The exact same statements apply for progressive JPEG: the default tables
285 * don't work for progressive mode. (This may get fixed, however.)
286 */
287 #define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */
288
289 /* Decoder capability options: */
290
291 #define D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
292 #define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
293 #define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
294 #define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */
295 #define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */
296 #define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */
297 #undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */
298 #define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */
299 #define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */
300 #define QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */
301
302 /* more capability options later, no doubt */
303
304
305 /*
306 * Ordering of RGB data in scanlines passed to or from the application.
307 * If your application wants to deal with data in the order B,G,R, just
308 * change these macros. You can also deal with formats such as R,G,B,X
309 * (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing
310 * the offsets will also change the order in which colormap data is organized.
311 * RESTRICTIONS:
312 * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
313 * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
314 * useful if you are using JPEG color spaces other than YCbCr or grayscale.
315 * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
316 * is not 3 (they don't understand about dummy color components!). So you
317 * can't use color quantization if you change that value.
318 */
319
320 #define RGB_RED 0 /* Offset of Red in an RGB scanline element */
321 #define RGB_GREEN 1 /* Offset of Green */
322 #define RGB_BLUE 2 /* Offset of Blue */
323 #define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */
324
325
326 /* Definitions for speed-related optimizations. */
327
328
329 /* If your compiler supports inline functions, define INLINE
330 * as the inline keyword; otherwise define it as empty.
331 */
332
333 #ifndef INLINE
334 #ifdef __GNUC__ /* for instance, GNU C knows about inline */
335 #define INLINE __inline__
336 #endif
337 #ifndef INLINE
338 #define INLINE /* default is to define it as empty */
339 #endif
340 #endif
341
342
343 /* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
344 * two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER
345 * as short on such a machine. MULTIPLIER must be at least 16 bits wide.
346 */
347
348 #ifndef MULTIPLIER
349 #define MULTIPLIER int /* type for fastest integer multiply */
350 #endif
351
352
353 /* FAST_FLOAT should be either float or double, whichever is done faster
354 * by your compiler. (Note that this type is only used in the floating point
355 * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
356 * Typically, float is faster in ANSI C compilers, while double is faster in
357 * pre-ANSI compilers (because they insist on converting to double anyway).
358 * The code below therefore chooses float if we have ANSI-style prototypes.
359 */
360
361 #ifndef FAST_FLOAT
362 #ifdef HAVE_PROTOTYPES
363 #define FAST_FLOAT float
364 #else
365 #define FAST_FLOAT double
366 #endif
367 #endif
368
369 #endif /* JPEG_INTERNAL_OPTIONS */

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