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1/*
2 * jmorecfg.h
3 *
4 * This file was part of the Independent JPEG Group's software:
5 * Copyright (C) 1991-1997, Thomas G. Lane.
6 * Modifications:
7 * Copyright (C) 2009, 2011, D. R. Commander.
8 * For conditions of distribution and use, see the accompanying README file.
9 *
10 * This file contains additional configuration options that customize the
11 * JPEG software for special applications or support machine-dependent
12 * optimizations. Most users will not need to touch this file.
13 */
14
15
16/*
17 * Define BITS_IN_JSAMPLE as either
18 * 8 for 8-bit sample values (the usual setting)
19 * 12 for 12-bit sample values
20 * Only 8 and 12 are legal data precisions for lossy JPEG according to the
21 * JPEG standard, and the IJG code does not support anything else!
22 * We do not support run-time selection of data precision, sorry.
23 */
24
25#define BITS_IN_JSAMPLE 8 /* use 8 or 12 */
26
27
28/*
29 * Maximum number of components (color channels) allowed in JPEG image.
30 * To meet the letter of the JPEG spec, set this to 255. However, darn
31 * few applications need more than 4 channels (maybe 5 for CMYK + alpha
32 * mask). We recommend 10 as a reasonable compromise; use 4 if you are
33 * really short on memory. (Each allowed component costs a hundred or so
34 * bytes of storage, whether actually used in an image or not.)
35 */
36
37#define MAX_COMPONENTS 10 /* maximum number of image components */
38
39
40/*
41 * Basic data types.
42 * You may need to change these if you have a machine with unusual data
43 * type sizes; for example, "char" not 8 bits, "short" not 16 bits,
44 * or "long" not 32 bits. We don't care whether "int" is 16 or 32 bits,
45 * but it had better be at least 16.
46 */
47
48/* Representation of a single sample (pixel element value).
49 * We frequently allocate large arrays of these, so it's important to keep
50 * them small. But if you have memory to burn and access to char or short
51 * arrays is very slow on your hardware, you might want to change these.
52 */
53
54#if BITS_IN_JSAMPLE == 8
55/* JSAMPLE should be the smallest type that will hold the values 0..255.
56 * You can use a signed char by having GETJSAMPLE mask it with 0xFF.
57 */
58
59#ifdef HAVE_UNSIGNED_CHAR
60
61typedef unsigned char JSAMPLE;
62#define GETJSAMPLE(value) ((int) (value))
63
64#else /* not HAVE_UNSIGNED_CHAR */
65
66typedef char JSAMPLE;
67#ifdef __CHAR_UNSIGNED__
68#define GETJSAMPLE(value) ((int) (value))
69#else
70#define GETJSAMPLE(value) ((int) (value) & 0xFF)
71#endif /* __CHAR_UNSIGNED__ */
72
73#endif /* HAVE_UNSIGNED_CHAR */
74
75#define MAXJSAMPLE 255
76#define CENTERJSAMPLE 128
77
78#endif /* BITS_IN_JSAMPLE == 8 */
79
80
81#if BITS_IN_JSAMPLE == 12
82/* JSAMPLE should be the smallest type that will hold the values 0..4095.
83 * On nearly all machines "short" will do nicely.
84 */
85
86typedef short JSAMPLE;
87#define GETJSAMPLE(value) ((int) (value))
88
89#define MAXJSAMPLE 4095
90#define CENTERJSAMPLE 2048
91
92#endif /* BITS_IN_JSAMPLE == 12 */
93
94
95/* Representation of a DCT frequency coefficient.
96 * This should be a signed value of at least 16 bits; "short" is usually OK.
97 * Again, we allocate large arrays of these, but you can change to int
98 * if you have memory to burn and "short" is really slow.
99 */
100
101typedef short JCOEF;
102
103
104/* Compressed datastreams are represented as arrays of JOCTET.
105 * These must be EXACTLY 8 bits wide, at least once they are written to
106 * external storage. Note that when using the stdio data source/destination
107 * managers, this is also the data type passed to fread/fwrite.
108 */
109
110#ifdef HAVE_UNSIGNED_CHAR
111
112typedef unsigned char JOCTET;
113#define GETJOCTET(value) (value)
114
115#else /* not HAVE_UNSIGNED_CHAR */
116
117typedef char JOCTET;
118#ifdef __CHAR_UNSIGNED__
119#define GETJOCTET(value) (value)
120#else
121#define GETJOCTET(value) ((value) & 0xFF)
122#endif /* __CHAR_UNSIGNED__ */
123
124#endif /* HAVE_UNSIGNED_CHAR */
125
126
127/* These typedefs are used for various table entries and so forth.
128 * They must be at least as wide as specified; but making them too big
129 * won't cost a huge amount of memory, so we don't provide special
130 * extraction code like we did for JSAMPLE. (In other words, these
131 * typedefs live at a different point on the speed/space tradeoff curve.)
132 */
133
134/* UINT8 must hold at least the values 0..255. */
135
136#ifdef HAVE_UNSIGNED_CHAR
137typedef unsigned char UINT8;
138#else /* not HAVE_UNSIGNED_CHAR */
139#ifdef __CHAR_UNSIGNED__
140typedef char UINT8;
141#else /* not __CHAR_UNSIGNED__ */
142typedef short UINT8;
143#endif /* __CHAR_UNSIGNED__ */
144#endif /* HAVE_UNSIGNED_CHAR */
145
146/* UINT16 must hold at least the values 0..65535. */
147
148#ifdef HAVE_UNSIGNED_SHORT
149typedef unsigned short UINT16;
150#else /* not HAVE_UNSIGNED_SHORT */
151typedef unsigned int UINT16;
152#endif /* HAVE_UNSIGNED_SHORT */
153
154/* INT16 must hold at least the values -32768..32767. */
155
156#ifndef XMD_H /* X11/xmd.h correctly defines INT16 */
157typedef short INT16;
158#endif
159
160/* INT32 must hold at least signed 32-bit values. */
161
162#ifndef XMD_H /* X11/xmd.h correctly defines INT32 */
163typedef long INT32;
164#endif
165
166/* Datatype used for image dimensions. The JPEG standard only supports
167 * images up to 64K*64K due to 16-bit fields in SOF markers. Therefore
168 * "unsigned int" is sufficient on all machines. However, if you need to
169 * handle larger images and you don't mind deviating from the spec, you
170 * can change this datatype.
171 */
172
173typedef unsigned int JDIMENSION;
174
175#define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */
176
177
178/* These macros are used in all function definitions and extern declarations.
179 * You could modify them if you need to change function linkage conventions;
180 * in particular, you'll need to do that to make the library a Windows DLL.
181 * Another application is to make all functions global for use with debuggers
182 * or code profilers that require it.
183 */
184
185/* a function called through method pointers: */
186#define METHODDEF(type) static type
187/* a function used only in its module: */
188#define LOCAL(type) static type
189/* a function referenced thru EXTERNs: */
190#define GLOBAL(type) type
191/* a reference to a GLOBAL function: */
192#define EXTERN(type) extern type
193
194
195/* This macro is used to declare a "method", that is, a function pointer.
196 * We want to supply prototype parameters if the compiler can cope.
197 * Note that the arglist parameter must be parenthesized!
198 * Again, you can customize this if you need special linkage keywords.
199 */
200
201#ifdef HAVE_PROTOTYPES
202#define JMETHOD(type,methodname,arglist) type (*methodname) arglist
203#else
204#define JMETHOD(type,methodname,arglist) type (*methodname) ()
205#endif
206
207
208/* Here is the pseudo-keyword for declaring pointers that must be "far"
209 * on 80x86 machines. Most of the specialized coding for 80x86 is handled
210 * by just saying "FAR *" where such a pointer is needed. In a few places
211 * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
212 */
213
214#ifdef NEED_FAR_POINTERS
215#ifndef FAR
216#define FAR far
217#endif
218#else
219#undef FAR
220#define FAR
221#endif
222
223
224/*
225 * On a few systems, type boolean and/or its values FALSE, TRUE may appear
226 * in standard header files. Or you may have conflicts with application-
227 * specific header files that you want to include together with these files.
228 * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
229 */
230
231#ifndef HAVE_BOOLEAN
232typedef int boolean;
233#endif
234#ifndef FALSE /* in case these macros already exist */
235#define FALSE 0 /* values of boolean */
236#endif
237#ifndef TRUE
238#define TRUE 1
239#endif
240
241
242/*
243 * The remaining options affect code selection within the JPEG library,
244 * but they don't need to be visible to most applications using the library.
245 * To minimize application namespace pollution, the symbols won't be
246 * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
247 */
248
249#ifdef JPEG_INTERNALS
250#define JPEG_INTERNAL_OPTIONS
251#endif
252
253#ifdef JPEG_INTERNAL_OPTIONS
254
255
256/*
257 * These defines indicate whether to include various optional functions.
258 * Undefining some of these symbols will produce a smaller but less capable
259 * library. Note that you can leave certain source files out of the
260 * compilation/linking process if you've #undef'd the corresponding symbols.
261 * (You may HAVE to do that if your compiler doesn't like null source files.)
262 */
263
264/* Capability options common to encoder and decoder: */
265
266#define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */
267#define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */
268#define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */
269
270/* Encoder capability options: */
271
272#define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
273#define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
274#define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */
275/* Note: if you selected 12-bit data precision, it is dangerous to turn off
276 * ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit
277 * precision, so jchuff.c normally uses entropy optimization to compute
278 * usable tables for higher precision. If you don't want to do optimization,
279 * you'll have to supply different default Huffman tables.
280 * The exact same statements apply for progressive JPEG: the default tables
281 * don't work for progressive mode. (This may get fixed, however.)
282 */
283#define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */
284
285/* Decoder capability options: */
286
287#define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
288#define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
289#define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */
290#define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */
291#define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */
292#undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */
293#define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */
294#define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */
295#define QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */
296
297/* more capability options later, no doubt */
298
299
300/*
301 * Ordering of RGB data in scanlines passed to or from the application.
302 * If your application wants to deal with data in the order B,G,R, just
303 * change these macros. You can also deal with formats such as R,G,B,X
304 * (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing
305 * the offsets will also change the order in which colormap data is organized.
306 * RESTRICTIONS:
307 * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
308 * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
309 * useful if you are using JPEG color spaces other than YCbCr or grayscale.
310 * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
311 * is not 3 (they don't understand about dummy color components!). So you
312 * can't use color quantization if you change that value.
313 */
314
315#define RGB_RED 0 /* Offset of Red in an RGB scanline element */
316#define RGB_GREEN 1 /* Offset of Green */
317#define RGB_BLUE 2 /* Offset of Blue */
318#define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */
319
320#define JPEG_NUMCS 16
321
322#define EXT_RGB_RED 0
323#define EXT_RGB_GREEN 1
324#define EXT_RGB_BLUE 2
325#define EXT_RGB_PIXELSIZE 3
326
327#define EXT_RGBX_RED 0
328#define EXT_RGBX_GREEN 1
329#define EXT_RGBX_BLUE 2
330#define EXT_RGBX_PIXELSIZE 4
331
332#define EXT_BGR_RED 2
333#define EXT_BGR_GREEN 1
334#define EXT_BGR_BLUE 0
335#define EXT_BGR_PIXELSIZE 3
336
337#define EXT_BGRX_RED 2
338#define EXT_BGRX_GREEN 1
339#define EXT_BGRX_BLUE 0
340#define EXT_BGRX_PIXELSIZE 4
341
342#define EXT_XBGR_RED 3
343#define EXT_XBGR_GREEN 2
344#define EXT_XBGR_BLUE 1
345#define EXT_XBGR_PIXELSIZE 4
346
347#define EXT_XRGB_RED 1
348#define EXT_XRGB_GREEN 2
349#define EXT_XRGB_BLUE 3
350#define EXT_XRGB_PIXELSIZE 4
351
352static const int rgb_red[JPEG_NUMCS] = {
353 -1, -1, RGB_RED, -1, -1, -1, EXT_RGB_RED, EXT_RGBX_RED,
354 EXT_BGR_RED, EXT_BGRX_RED, EXT_XBGR_RED, EXT_XRGB_RED,
355 EXT_RGBX_RED, EXT_BGRX_RED, EXT_XBGR_RED, EXT_XRGB_RED
356};
357
358static const int rgb_green[JPEG_NUMCS] = {
359 -1, -1, RGB_GREEN, -1, -1, -1, EXT_RGB_GREEN, EXT_RGBX_GREEN,
360 EXT_BGR_GREEN, EXT_BGRX_GREEN, EXT_XBGR_GREEN, EXT_XRGB_GREEN,
361 EXT_RGBX_GREEN, EXT_BGRX_GREEN, EXT_XBGR_GREEN, EXT_XRGB_GREEN
362};
363
364static const int rgb_blue[JPEG_NUMCS] = {
365 -1, -1, RGB_BLUE, -1, -1, -1, EXT_RGB_BLUE, EXT_RGBX_BLUE,
366 EXT_BGR_BLUE, EXT_BGRX_BLUE, EXT_XBGR_BLUE, EXT_XRGB_BLUE,
367 EXT_RGBX_BLUE, EXT_BGRX_BLUE, EXT_XBGR_BLUE, EXT_XRGB_BLUE
368};
369
370static const int rgb_pixelsize[JPEG_NUMCS] = {
371 -1, -1, RGB_PIXELSIZE, -1, -1, -1, EXT_RGB_PIXELSIZE, EXT_RGBX_PIXELSIZE,
372 EXT_BGR_PIXELSIZE, EXT_BGRX_PIXELSIZE, EXT_XBGR_PIXELSIZE, EXT_XRGB_PIXELSIZE,
373 EXT_RGBX_PIXELSIZE, EXT_BGRX_PIXELSIZE, EXT_XBGR_PIXELSIZE, EXT_XRGB_PIXELSIZE
374};
375
376/* Definitions for speed-related optimizations. */
377
378/* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
379 * two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER
380 * as short on such a machine. MULTIPLIER must be at least 16 bits wide.
381 */
382
383#ifndef MULTIPLIER
384#ifndef WITH_SIMD
385#define MULTIPLIER int /* type for fastest integer multiply */
386#else
387#define MULTIPLIER short /* prefer 16-bit with SIMD for parellelism */
388#endif
389#endif
390
391
392/* FAST_FLOAT should be either float or double, whichever is done faster
393 * by your compiler. (Note that this type is only used in the floating point
394 * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
395 * Typically, float is faster in ANSI C compilers, while double is faster in
396 * pre-ANSI compilers (because they insist on converting to double anyway).
397 * The code below therefore chooses float if we have ANSI-style prototypes.
398 */
399
400#ifndef FAST_FLOAT
401#ifdef HAVE_PROTOTYPES
402#define FAST_FLOAT float
403#else
404#define FAST_FLOAT double
405#endif
406#endif
407
408#endif /* JPEG_INTERNAL_OPTIONS */
409

Warning: That file was not part of the compilation database. It may have many parsing errors.