OFFIS DCMTK  Version 3.6.0
jmorecfg8.h
1 /*
2  * jmorecfg.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 contains additional configuration options that customize the
9  * JPEG software for special applications or support machine-dependent
10  * optimizations. Most users will not need to touch this file.
11  */
12 
13 
14 /*
15  * Define BITS_IN_JSAMPLE as either
16  * 8 for 8-bit sample values (the usual setting)
17  * 12 for 12-bit sample values
18  * Only 8 and 12 are legal data precisions for lossy JPEG according to the
19  * JPEG standard, and the IJG code does not support anything else!
20  * We do not support run-time selection of data precision, sorry.
21  */
22 
23 #define BITS_IN_JSAMPLE 8 /* use 8 or 12 (or 16 for lossless) */
24 
25 
26 /*
27  * Maximum number of components (color channels) allowed in JPEG image.
28  * To meet the letter of the JPEG spec, set this to 255. However, darn
29  * few applications need more than 4 channels (maybe 5 for CMYK + alpha
30  * mask). We recommend 10 as a reasonable compromise; use 4 if you are
31  * really short on memory. (Each allowed component costs a hundred or so
32  * bytes of storage, whether actually used in an image or not.)
33  */
34 
35 #define MAX_COMPONENTS 10 /* maximum number of image components */
36 
37 
38 /*
39  * Basic data types.
40  * You may need to change these if you have a machine with unusual data
41  * type sizes; for example, "char" not 8 bits, "short" not 16 bits,
42  * or "long" not 32 bits. We don't care whether "int" is 16 or 32 bits,
43  * but it had better be at least 16.
44  */
45 
46 /* Representation of a single sample (pixel element value).
47  * We frequently allocate large arrays of these, so it's important to keep
48  * them small. But if you have memory to burn and access to char or short
49  * arrays is very slow on your hardware, you might want to change these.
50  */
51 
52 #if BITS_IN_JSAMPLE == 8
53 /* JSAMPLE should be the smallest type that will hold the values 0..255.
54  * You can use a signed char by having GETJSAMPLE mask it with 0xFF.
55  */
56 
57 #ifdef HAVE_UNSIGNED_CHAR
58 
59 typedef unsigned char JSAMPLE;
60 #define GETJSAMPLE(value) ((int) (value))
61 
62 #else /* not HAVE_UNSIGNED_CHAR */
63 
64 typedef char JSAMPLE;
65 #ifdef CHAR_IS_UNSIGNED
66 #define GETJSAMPLE(value) ((int) (value))
67 #else
68 #define GETJSAMPLE(value) ((int) (value) & 0xFF)
69 #endif /* CHAR_IS_UNSIGNED */
70 
71 #endif /* HAVE_UNSIGNED_CHAR */
72 
73 #define MAXJSAMPLE 255
74 #define CENTERJSAMPLE 128
75 
76 #endif /* BITS_IN_JSAMPLE == 8 */
77 
78 
79 #if BITS_IN_JSAMPLE == 12
80 /* JSAMPLE should be the smallest type that will hold the values 0..4095.
81  * On nearly all machines "short" will do nicely.
82  */
83 
84 typedef short JSAMPLE;
85 #define GETJSAMPLE(value) ((int) (value))
86 
87 #define MAXJSAMPLE 4095
88 #define CENTERJSAMPLE 2048
89 
90 #endif /* BITS_IN_JSAMPLE == 12 */
91 
92 
93 #if BITS_IN_JSAMPLE == 16
94 /* JSAMPLE should be the smallest type that will hold the values 0..65535.
95  * You can use a signed short by having GETJSAMPLE mask it with 0xFFFF.
96  */
97 
98 #ifdef HAVE_UNSIGNED_SHORT
99 
100 typedef unsigned short JSAMPLE;
101 #define GETJSAMPLE(value) ((int) (value))
102 
103 #else /* not HAVE_UNSIGNED_SHORT */
104 
105 typedef short JSAMPLE;
106 #ifdef SHORT_IS_UNSIGNED
107 #define GETJSAMPLE(value) ((int) (value))
108 #else
109 #define GETJSAMPLE(value) ((int) (value) & 0xFFFF)
110 #endif /* SHORT_IS_UNSIGNED */
111 
112 #endif /* HAVE_UNSIGNED_SHORT */
113 
114 #define MAXJSAMPLE 65535
115 #define CENTERJSAMPLE 32768
116 
117 #endif /* BITS_IN_JSAMPLE == 16 */
118 
119 
120 /* Representation of a DCT frequency coefficient.
121  * This should be a signed value of at least 16 bits; "short" is usually OK.
122  * Again, we allocate large arrays of these, but you can change to int
123  * if you have memory to burn and "short" is really slow.
124  */
125 
126 typedef short JCOEF;
127 
128 
129 /* Representation of a spatial difference value.
130  * This should be a signed value of at least 16 bits; int is usually OK.
131  */
132 
133 typedef int JDIFF;
134 
135 
136 /* Compressed datastreams are represented as arrays of JOCTET.
137  * These must be EXACTLY 8 bits wide, at least once they are written to
138  * external storage. Note that when using the stdio data source/destination
139  * managers, this is also the data type passed to fread/fwrite.
140  */
141 
142 #ifdef HAVE_UNSIGNED_CHAR
143 
144 typedef unsigned char JOCTET;
145 #define GETJOCTET(value) (value)
146 
147 #else /* not HAVE_UNSIGNED_CHAR */
148 
149 typedef char JOCTET;
150 #ifdef CHAR_IS_UNSIGNED
151 #define GETJOCTET(value) (value)
152 #else
153 #define GETJOCTET(value) ((value) & 0xFF)
154 #endif /* CHAR_IS_UNSIGNED */
155 
156 #endif /* HAVE_UNSIGNED_CHAR */
157 
158 
159 /* These typedefs are used for various table entries and so forth.
160  * They must be at least as wide as specified; but making them too big
161  * won't cost a huge amount of memory, so we don't provide special
162  * extraction code like we did for JSAMPLE. (In other words, these
163  * typedefs live at a different point on the speed/space tradeoff curve.)
164  */
165 
166 /* UINT8 must hold at least the values 0..255. */
167 
168 #ifdef HAVE_UNSIGNED_CHAR
169 typedef unsigned char UINT8;
170 #else /* not HAVE_UNSIGNED_CHAR */
171 #ifdef CHAR_IS_UNSIGNED
172 typedef char UINT8;
173 #else /* not CHAR_IS_UNSIGNED */
174 typedef short UINT8;
175 #endif /* CHAR_IS_UNSIGNED */
176 #endif /* HAVE_UNSIGNED_CHAR */
177 
178 /* UINT16 must hold at least the values 0..65535. */
179 
180 #ifdef HAVE_UNSIGNED_SHORT
181 typedef unsigned short UINT16;
182 #else /* not HAVE_UNSIGNED_SHORT */
183 typedef unsigned int UINT16;
184 #endif /* HAVE_UNSIGNED_SHORT */
185 
186 /* INT16 must hold at least the values -32768..32767. */
187 
188 #ifndef XMD_H /* X11/xmd.h correctly defines INT16 */
189 typedef short INT16;
190 #endif
191 
192 /* IJG_INT32 must hold at least signed 32-bit values. */
193 typedef long IJG_INT32;
194 
195 /* Datatype used for image dimensions. The JPEG standard only supports
196  * images up to 64K*64K due to 16-bit fields in SOF markers. Therefore
197  * "unsigned int" is sufficient on all machines. However, if you need to
198  * handle larger images and you don't mind deviating from the spec, you
199  * can change this datatype.
200  */
201 
202 typedef unsigned int JDIMENSION;
203 
204 #define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */
205 
206 
207 /* These macros are used in all function definitions and extern declarations.
208  * You could modify them if you need to change function linkage conventions;
209  * in particular, you'll need to do that to make the library a Windows DLL.
210  * Another application is to make all functions global for use with debuggers
211  * or code profilers that require it.
212  */
213 
214 /* a function called through method pointers: */
215 #define METHODDEF(type) static type
216 /* a function used only in its module: */
217 #define LOCAL(type) static type
218 /* a function referenced thru EXTERNs: */
219 #define GLOBAL(type) type
220 /* a reference to a GLOBAL function: */
221 #define EXTERN(type) extern type
222 
223 
224 /* This macro is used to declare a "method", that is, a function pointer.
225  * We want to supply prototype parameters if the compiler can cope.
226  * Note that the arglist parameter must be parenthesized!
227  * Again, you can customize this if you need special linkage keywords.
228  */
229 
230 #ifdef HAVE_PROTOTYPES
231 #define JMETHOD(type,methodname,arglist) type (*methodname) arglist
232 #else
233 #define JMETHOD(type,methodname,arglist) type (*methodname) ()
234 #endif
235 
236 
237 /* Here is the pseudo-keyword for declaring pointers that must be "far"
238  * on 80x86 machines. Most of the specialized coding for 80x86 is handled
239  * by just saying "FAR *" where such a pointer is needed. In a few places
240  * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
241  */
242 
243 #undef FAR
244 #ifdef NEED_FAR_POINTERS
245 #define FAR far
246 #else
247 #define FAR
248 #endif
249 
250 
251 /*
252  * On a few systems, type boolean and/or its values FALSE, TRUE may appear
253  * in standard header files. Or you may have conflicts with application-
254  * specific header files that you want to include together with these files.
255  * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
256  */
257 
258 #ifndef HAVE_BOOLEAN
259 typedef int boolean;
260 #endif
261 #ifndef FALSE /* in case these macros already exist */
262 #define FALSE 0 /* values of boolean */
263 #endif
264 #ifndef TRUE
265 #define TRUE 1
266 #endif
267 
268 
269 /*
270  * The remaining options affect code selection within the JPEG library,
271  * but they don't need to be visible to most applications using the library.
272  * To minimize application namespace pollution, the symbols won't be
273  * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
274  */
275 
276 #ifdef JPEG_INTERNALS
277 #define JPEG_INTERNAL_OPTIONS
278 #endif
279 
280 #ifdef JPEG_INTERNAL_OPTIONS
281 
282 
283 /*
284  * These defines indicate whether to include various optional functions.
285  * Undefining some of these symbols will produce a smaller but less capable
286  * library. Note that you can leave certain source files out of the
287  * compilation/linking process if you've #undef'd the corresponding symbols.
288  * (You may HAVE to do that if your compiler doesn't like null source files.)
289  */
290 
291 /* Arithmetic coding is unsupported for legal reasons. Complaints to IBM. */
292 
293 /* Capability options common to encoder and decoder: */
294 
295 #define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */
296 #define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */
297 #define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */
298 
299 /* Encoder capability options: */
300 
301 #undef C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
302 #define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
303 #define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
304 #define C_LOSSLESS_SUPPORTED /* Lossless JPEG? */
305 #define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */
306 /* Note: if you selected 12-bit data precision, it is dangerous to turn off
307  * ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit
308  * precision, so jcshuff.c normally uses entropy optimization to compute
309  * usable tables for higher precision. If you don't want to do optimization,
310  * you'll have to supply different default Huffman tables.
311  * The exact same statements apply for progressive and lossless JPEG:
312  * the default tables don't work for progressive mode or lossless mode.
313  * (This may get fixed, however.)
314  */
315 #define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */
316 
317 /* Decoder capability options: */
318 
319 #undef D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
320 #define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
321 #define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
322 #define D_LOSSLESS_SUPPORTED /* Lossless JPEG? */
323 #define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */
324 #define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */
325 #define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */
326 #undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */
327 #define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */
328 #define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */
329 #define QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */
330 
331 /* more capability options later, no doubt */
332 
333 
334 /*
335  * Ordering of RGB data in scanlines passed to or from the application.
336  * If your application wants to deal with data in the order B,G,R, just
337  * change these macros. You can also deal with formats such as R,G,B,X
338  * (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing
339  * the offsets will also change the order in which colormap data is organized.
340  * RESTRICTIONS:
341  * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
342  * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
343  * useful if you are using JPEG color spaces other than YCbCr or grayscale.
344  * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
345  * is not 3 (they don't understand about dummy color components!). So you
346  * can't use color quantization if you change that value.
347  */
348 
349 #define RGB_RED 0 /* Offset of Red in an RGB scanline element */
350 #define RGB_GREEN 1 /* Offset of Green */
351 #define RGB_BLUE 2 /* Offset of Blue */
352 #define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */
353 
354 
355 /* Definitions for speed-related optimizations. */
356 
357 
358 /* If your compiler supports inline functions, define INLINE
359  * as the inline keyword; otherwise define it as empty.
360  */
361 
362 #ifndef INLINE
363 #ifdef __GNUC__ /* for instance, GNU C knows about inline */
364 #define INLINE __inline__
365 #endif
366 #ifndef INLINE
367 #define INLINE /* default is to define it as empty */
368 #endif
369 #endif
370 
371 
372 /* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
373  * two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER
374  * as short on such a machine. MULTIPLIER must be at least 16 bits wide.
375  */
376 
377 #ifndef MULTIPLIER
378 #define MULTIPLIER int /* type for fastest integer multiply */
379 #endif
380 
381 
382 /* FAST_FLOAT should be either float or double, whichever is done faster
383  * by your compiler. (Note that this type is only used in the floating point
384  * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
385  * Typically, float is faster in ANSI C compilers, while double is faster in
386  * pre-ANSI compilers (because they insist on converting to double anyway).
387  * The code below therefore chooses float if we have ANSI-style prototypes.
388  */
389 
390 #ifndef FAST_FLOAT
391 #ifdef HAVE_PROTOTYPES
392 #define FAST_FLOAT float
393 #else
394 #define FAST_FLOAT double
395 #endif
396 #endif
397 
398 #endif /* JPEG_INTERNAL_OPTIONS */


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