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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 | |
61 | typedef unsigned char JSAMPLE; |
62 | #define GETJSAMPLE(value) ((int) (value)) |
63 | |
64 | #else /* not HAVE_UNSIGNED_CHAR */ |
65 | |
66 | typedef 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 | |
86 | typedef 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 | |
101 | typedef 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 | |
112 | typedef unsigned char JOCTET; |
113 | #define GETJOCTET(value) (value) |
114 | |
115 | #else /* not HAVE_UNSIGNED_CHAR */ |
116 | |
117 | typedef 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 |
137 | typedef unsigned char UINT8; |
138 | #else /* not HAVE_UNSIGNED_CHAR */ |
139 | #ifdef __CHAR_UNSIGNED__ |
140 | typedef char UINT8; |
141 | #else /* not __CHAR_UNSIGNED__ */ |
142 | typedef 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 |
149 | typedef unsigned short UINT16; |
150 | #else /* not HAVE_UNSIGNED_SHORT */ |
151 | typedef 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 */ |
157 | typedef 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 */ |
163 | typedef 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 | |
173 | typedef 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 |
232 | typedef 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 | |
352 | static 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 | |
358 | static 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 | |
364 | static 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 | |
370 | static 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.