source: rtems-graphics-toolkit/jpeg-8d/jmorecfg.h @ 86b99f7

Last change on this file since 86b99f7 was 86b99f7, checked in by Alexandru-Sever Horin <alex.sever.h@…>, on Aug 1, 2012 at 10:40:32 PM

Added jpeg-8d version. Made modifications to compile for RTEMS, without man or binaries

  • Property mode set to 100644
File size: 12.3 KB
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1/*
2 * jmorecfg.h
3 *
4 * Copyright (C) 1991-1997, Thomas G. Lane.
5 * Modified 1997-2011 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
60typedef unsigned char JSAMPLE;
61#define GETJSAMPLE(value)  ((int) (value))
62
63#else /* not HAVE_UNSIGNED_CHAR */
64
65typedef 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
85typedef 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
100typedef 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
111typedef unsigned char JOCTET;
112#define GETJOCTET(value)  (value)
113
114#else /* not HAVE_UNSIGNED_CHAR */
115
116typedef 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
136typedef unsigned char UINT8;
137#else /* not HAVE_UNSIGNED_CHAR */
138#ifdef CHAR_IS_UNSIGNED
139typedef char UINT8;
140#else /* not CHAR_IS_UNSIGNED */
141typedef 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
148typedef unsigned short UINT16;
149#else /* not HAVE_UNSIGNED_SHORT */
150typedef 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 */
156typedef 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 _BASETSD_H              /* MinGW is slightly different */
164#ifndef QGLOBAL_H               /* Qt defines it in qglobal.h */
165typedef long INT32;
166#endif
167#endif
168#endif
169#endif
170
171/* Datatype used for image dimensions.  The JPEG standard only supports
172 * images up to 64K*64K due to 16-bit fields in SOF markers.  Therefore
173 * "unsigned int" is sufficient on all machines.  However, if you need to
174 * handle larger images and you don't mind deviating from the spec, you
175 * can change this datatype.
176 */
177
178typedef unsigned int JDIMENSION;
179
180#define JPEG_MAX_DIMENSION  65500L  /* a tad under 64K to prevent overflows */
181
182
183/* These macros are used in all function definitions and extern declarations.
184 * You could modify them if you need to change function linkage conventions;
185 * in particular, you'll need to do that to make the library a Windows DLL.
186 * Another application is to make all functions global for use with debuggers
187 * or code profilers that require it.
188 */
189
190/* a function called through method pointers: */
191#define METHODDEF(type)         static type
192/* a function used only in its module: */
193#define LOCAL(type)             static type
194/* a function referenced thru EXTERNs: */
195#define GLOBAL(type)            type
196/* a reference to a GLOBAL function: */
197#define EXTERN(type)            extern type
198
199
200/* This macro is used to declare a "method", that is, a function pointer.
201 * We want to supply prototype parameters if the compiler can cope.
202 * Note that the arglist parameter must be parenthesized!
203 * Again, you can customize this if you need special linkage keywords.
204 */
205
206#ifdef HAVE_PROTOTYPES
207#define JMETHOD(type,methodname,arglist)  type (*methodname) arglist
208#else
209#define JMETHOD(type,methodname,arglist)  type (*methodname) ()
210#endif
211
212
213/* Here is the pseudo-keyword for declaring pointers that must be "far"
214 * on 80x86 machines.  Most of the specialized coding for 80x86 is handled
215 * by just saying "FAR *" where such a pointer is needed.  In a few places
216 * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
217 */
218
219#ifndef FAR
220#ifdef NEED_FAR_POINTERS
221#define FAR  far
222#else
223#define FAR
224#endif
225#endif
226
227
228/*
229 * On a few systems, type boolean and/or its values FALSE, TRUE may appear
230 * in standard header files.  Or you may have conflicts with application-
231 * specific header files that you want to include together with these files.
232 * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
233 */
234
235#ifndef HAVE_BOOLEAN
236typedef int boolean;
237#endif
238#ifndef FALSE                   /* in case these macros already exist */
239#define FALSE   0               /* values of boolean */
240#endif
241#ifndef TRUE
242#define TRUE    1
243#endif
244
245
246/*
247 * The remaining options affect code selection within the JPEG library,
248 * but they don't need to be visible to most applications using the library.
249 * To minimize application namespace pollution, the symbols won't be
250 * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
251 */
252
253#ifdef JPEG_INTERNALS
254#define JPEG_INTERNAL_OPTIONS
255#endif
256
257#ifdef JPEG_INTERNAL_OPTIONS
258
259
260/*
261 * These defines indicate whether to include various optional functions.
262 * Undefining some of these symbols will produce a smaller but less capable
263 * library.  Note that you can leave certain source files out of the
264 * compilation/linking process if you've #undef'd the corresponding symbols.
265 * (You may HAVE to do that if your compiler doesn't like null source files.)
266 */
267
268/* Capability options common to encoder and decoder: */
269
270#define DCT_ISLOW_SUPPORTED     /* slow but accurate integer algorithm */
271#define DCT_IFAST_SUPPORTED     /* faster, less accurate integer method */
272#define DCT_FLOAT_SUPPORTED     /* floating-point: accurate, fast on fast HW */
273
274/* Encoder capability options: */
275
276#define C_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */
277#define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
278#define C_PROGRESSIVE_SUPPORTED     /* Progressive JPEG? (Requires MULTISCAN)*/
279#define DCT_SCALING_SUPPORTED       /* Input rescaling via DCT? (Requires DCT_ISLOW)*/
280#define ENTROPY_OPT_SUPPORTED       /* Optimization of entropy coding parms? */
281/* Note: if you selected 12-bit data precision, it is dangerous to turn off
282 * ENTROPY_OPT_SUPPORTED.  The standard Huffman tables are only good for 8-bit
283 * precision, so jchuff.c normally uses entropy optimization to compute
284 * usable tables for higher precision.  If you don't want to do optimization,
285 * you'll have to supply different default Huffman tables.
286 * The exact same statements apply for progressive JPEG: the default tables
287 * don't work for progressive mode.  (This may get fixed, however.)
288 */
289#define INPUT_SMOOTHING_SUPPORTED   /* Input image smoothing option? */
290
291/* Decoder capability options: */
292
293#define D_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */
294#define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
295#define D_PROGRESSIVE_SUPPORTED     /* Progressive JPEG? (Requires MULTISCAN)*/
296#define IDCT_SCALING_SUPPORTED      /* Output rescaling via IDCT? */
297#define SAVE_MARKERS_SUPPORTED      /* jpeg_save_markers() needed? */
298#define BLOCK_SMOOTHING_SUPPORTED   /* Block smoothing? (Progressive only) */
299#undef  UPSAMPLE_SCALING_SUPPORTED  /* Output rescaling at upsample stage? */
300#define UPSAMPLE_MERGING_SUPPORTED  /* Fast path for sloppy upsampling? */
301#define QUANT_1PASS_SUPPORTED       /* 1-pass color quantization? */
302#define QUANT_2PASS_SUPPORTED       /* 2-pass color quantization? */
303
304/* more capability options later, no doubt */
305
306
307/*
308 * Ordering of RGB data in scanlines passed to or from the application.
309 * If your application wants to deal with data in the order B,G,R, just
310 * change these macros.  You can also deal with formats such as R,G,B,X
311 * (one extra byte per pixel) by changing RGB_PIXELSIZE.  Note that changing
312 * the offsets will also change the order in which colormap data is organized.
313 * RESTRICTIONS:
314 * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
315 * 2. 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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