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Dees_Troy51a0e822012-09-05 15:24:24 -04001/*
2 * jmorecfg.h
3 *
4 * Copyright (C) 1991-1997, 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 * Define ANDROID_RGB to enable specific optimizations for Android
15 * JCS_RGBA_8888 support
16 * JCS_RGB_565 support
17 *
18 */
19
20#define ANDROID_RGB
21
22#ifdef ANDROID_RGB
23#define PACK_SHORT_565(r,g,b) ((((r)<<8)&0xf800)|(((g)<<3)&0x7E0)|((b)>>3))
24#define PACK_TWO_PIXELS(l,r) ((r<<16) | l)
25#define PACK_NEED_ALIGNMENT(ptr) (((int)(ptr))&3)
26#define WRITE_TWO_PIXELS(addr, pixels) do { \
27 ((INT16*)(addr))[0] = (pixels); \
28 ((INT16*)(addr))[1] = (pixels)>>16; \
29 } while(0)
30#define WRITE_TWO_ALIGNED_PIXELS(addr, pixels) ((*(INT32*)(addr)) = pixels)
31#define DITHER_565_R(r, dither) ((r) + ((dither)&0xFF))
32#define DITHER_565_G(g, dither) ((g) + (((dither)&0xFF)>>1))
33#define DITHER_565_B(b, dither) ((b) + ((dither)&0xFF))
34#endif
35
36/*
37 * Define BITS_IN_JSAMPLE as either
38 * 8 for 8-bit sample values (the usual setting)
39 * 12 for 12-bit sample values
40 * Only 8 and 12 are legal data precisions for lossy JPEG according to the
41 * JPEG standard, and the IJG code does not support anything else!
42 * We do not support run-time selection of data precision, sorry.
43 */
44
45#define BITS_IN_JSAMPLE 8 /* use 8 or 12 */
46
47
48/*
49 * Maximum number of components (color channels) allowed in JPEG image.
50 * To meet the letter of the JPEG spec, set this to 255. However, darn
51 * few applications need more than 4 channels (maybe 5 for CMYK + alpha
52 * mask). We recommend 10 as a reasonable compromise; use 4 if you are
53 * really short on memory. (Each allowed component costs a hundred or so
54 * bytes of storage, whether actually used in an image or not.)
55 */
56
57#define MAX_COMPONENTS 10 /* maximum number of image components */
58
59
60/*
61 * Basic data types.
62 * You may need to change these if you have a machine with unusual data
63 * type sizes; for example, "char" not 8 bits, "short" not 16 bits,
64 * or "long" not 32 bits. We don't care whether "int" is 16 or 32 bits,
65 * but it had better be at least 16.
66 */
67
68/* Representation of a single sample (pixel element value).
69 * We frequently allocate large arrays of these, so it's important to keep
70 * them small. But if you have memory to burn and access to char or short
71 * arrays is very slow on your hardware, you might want to change these.
72 */
73
74#if BITS_IN_JSAMPLE == 8
75/* JSAMPLE should be the smallest type that will hold the values 0..255.
76 * You can use a signed char by having GETJSAMPLE mask it with 0xFF.
77 */
78
79#ifdef HAVE_UNSIGNED_CHAR
80
81typedef unsigned char JSAMPLE;
82#define GETJSAMPLE(value) ((int) (value))
83
84#else /* not HAVE_UNSIGNED_CHAR */
85
86typedef char JSAMPLE;
87#ifdef CHAR_IS_UNSIGNED
88#define GETJSAMPLE(value) ((int) (value))
89#else
90#define GETJSAMPLE(value) ((int) (value) & 0xFF)
91#endif /* CHAR_IS_UNSIGNED */
92
93#endif /* HAVE_UNSIGNED_CHAR */
94
95#define MAXJSAMPLE 255
96#define CENTERJSAMPLE 128
97
98#endif /* BITS_IN_JSAMPLE == 8 */
99
100
101#if BITS_IN_JSAMPLE == 12
102/* JSAMPLE should be the smallest type that will hold the values 0..4095.
103 * On nearly all machines "short" will do nicely.
104 */
105
106typedef short JSAMPLE;
107#define GETJSAMPLE(value) ((int) (value))
108
109#define MAXJSAMPLE 4095
110#define CENTERJSAMPLE 2048
111
112#endif /* BITS_IN_JSAMPLE == 12 */
113
114
115/* Representation of a DCT frequency coefficient.
116 * This should be a signed value of at least 16 bits; "short" is usually OK.
117 * Again, we allocate large arrays of these, but you can change to int
118 * if you have memory to burn and "short" is really slow.
119 */
120
121typedef short JCOEF;
122
123
124/* Compressed datastreams are represented as arrays of JOCTET.
125 * These must be EXACTLY 8 bits wide, at least once they are written to
126 * external storage. Note that when using the stdio data source/destination
127 * managers, this is also the data type passed to fread/fwrite.
128 */
129
130#ifdef HAVE_UNSIGNED_CHAR
131
132typedef unsigned char JOCTET;
133#define GETJOCTET(value) (value)
134
135#else /* not HAVE_UNSIGNED_CHAR */
136
137typedef char JOCTET;
138#ifdef CHAR_IS_UNSIGNED
139#define GETJOCTET(value) (value)
140#else
141#define GETJOCTET(value) ((value) & 0xFF)
142#endif /* CHAR_IS_UNSIGNED */
143
144#endif /* HAVE_UNSIGNED_CHAR */
145
146
147/* These typedefs are used for various table entries and so forth.
148 * They must be at least as wide as specified; but making them too big
149 * won't cost a huge amount of memory, so we don't provide special
150 * extraction code like we did for JSAMPLE. (In other words, these
151 * typedefs live at a different point on the speed/space tradeoff curve.)
152 */
153
154/* UINT8 must hold at least the values 0..255. */
155
156#ifdef HAVE_UNSIGNED_CHAR
157typedef unsigned char UINT8;
158#else /* not HAVE_UNSIGNED_CHAR */
159#ifdef CHAR_IS_UNSIGNED
160typedef char UINT8;
161#else /* not CHAR_IS_UNSIGNED */
162typedef short UINT8;
163#endif /* CHAR_IS_UNSIGNED */
164#endif /* HAVE_UNSIGNED_CHAR */
165
166/* UINT16 must hold at least the values 0..65535. */
167
168#ifdef HAVE_UNSIGNED_SHORT
169typedef unsigned short UINT16;
170#else /* not HAVE_UNSIGNED_SHORT */
171typedef unsigned int UINT16;
172#endif /* HAVE_UNSIGNED_SHORT */
173
174/* INT16 must hold at least the values -32768..32767. */
175
176#ifndef XMD_H /* X11/xmd.h correctly defines INT16 */
177typedef short INT16;
178#endif
179
180/* INT32 must hold at least signed 32-bit values. */
181
182#ifndef XMD_H /* X11/xmd.h correctly defines INT32 */
183typedef long INT32;
184#endif
185
186/* Datatype used for image dimensions. The JPEG standard only supports
187 * images up to 64K*64K due to 16-bit fields in SOF markers. Therefore
188 * "unsigned int" is sufficient on all machines. However, if you need to
189 * handle larger images and you don't mind deviating from the spec, you
190 * can change this datatype.
191 */
192
193typedef unsigned int JDIMENSION;
194
195#define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */
196
197
198/* These macros are used in all function definitions and extern declarations.
199 * You could modify them if you need to change function linkage conventions;
200 * in particular, you'll need to do that to make the library a Windows DLL.
201 * Another application is to make all functions global for use with debuggers
202 * or code profilers that require it.
203 */
204
205/* a function called through method pointers: */
206#define METHODDEF(type) static type
207/* a function used only in its module: */
208#define LOCAL(type) static type
209/* a function referenced thru EXTERNs: */
210#define GLOBAL(type) type
211/* a reference to a GLOBAL function: */
212#define EXTERN(type) extern type
213
214
215/* This macro is used to declare a "method", that is, a function pointer.
216 * We want to supply prototype parameters if the compiler can cope.
217 * Note that the arglist parameter must be parenthesized!
218 * Again, you can customize this if you need special linkage keywords.
219 */
220
221#ifdef HAVE_PROTOTYPES
222#define JMETHOD(type,methodname,arglist) type (*methodname) arglist
223#else
224#define JMETHOD(type,methodname,arglist) type (*methodname) ()
225#endif
226
227
228/* Here is the pseudo-keyword for declaring pointers that must be "far"
229 * on 80x86 machines. Most of the specialized coding for 80x86 is handled
230 * by just saying "FAR *" where such a pointer is needed. In a few places
231 * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
232 */
233
234#ifdef NEED_FAR_POINTERS
235#define FAR far
236#else
237#define FAR
238#endif
239
240
241/*
242 * On a few systems, type boolean and/or its values FALSE, TRUE may appear
243 * in standard header files. Or you may have conflicts with application-
244 * specific header files that you want to include together with these files.
245 * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
246 */
247
248#ifndef HAVE_BOOLEAN
249typedef int boolean;
250#endif
251#ifndef FALSE /* in case these macros already exist */
252#define FALSE 0 /* values of boolean */
253#endif
254#ifndef TRUE
255#define TRUE 1
256#endif
257
258
259/*
260 * The remaining options affect code selection within the JPEG library,
261 * but they don't need to be visible to most applications using the library.
262 * To minimize application namespace pollution, the symbols won't be
263 * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
264 */
265
266#ifdef JPEG_INTERNALS
267#define JPEG_INTERNAL_OPTIONS
268#endif
269
270#ifdef JPEG_INTERNAL_OPTIONS
271
272
273/*
274 * These defines indicate whether to include various optional functions.
275 * Undefining some of these symbols will produce a smaller but less capable
276 * library. Note that you can leave certain source files out of the
277 * compilation/linking process if you've #undef'd the corresponding symbols.
278 * (You may HAVE to do that if your compiler doesn't like null source files.)
279 */
280
281/* Arithmetic coding is unsupported for legal reasons. Complaints to IBM. */
282
283/* Capability options common to encoder and decoder: */
284
285#define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */
286#define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */
287#define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */
288
289/* Encoder capability options: */
290
291#undef C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
292#define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
293#define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
294#define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */
295/* Note: if you selected 12-bit data precision, it is dangerous to turn off
296 * ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit
297 * precision, so jchuff.c normally uses entropy optimization to compute
298 * usable tables for higher precision. If you don't want to do optimization,
299 * you'll have to supply different default Huffman tables.
300 * The exact same statements apply for progressive JPEG: the default tables
301 * don't work for progressive mode. (This may get fixed, however.)
302 */
303#define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */
304
305/* Decoder capability options: */
306
307#undef D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
308#define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
309#define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
310#define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */
311#define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */
312#define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */
313#undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */
314#define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */
315#define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */
316#define QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */
317
318/* more capability options later, no doubt */
319
320
321/*
322 * Ordering of RGB data in scanlines passed to or from the application.
323 * If your application wants to deal with data in the order B,G,R, just
324 * change these macros. You can also deal with formats such as R,G,B,X
325 * (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing
326 * the offsets will also change the order in which colormap data is organized.
327 * RESTRICTIONS:
328 * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
329 * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
330 * useful if you are using JPEG color spaces other than YCbCr or grayscale.
331 * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
332 * is not 3 (they don't understand about dummy color components!). So you
333 * can't use color quantization if you change that value.
334 */
335
336#define RGB_RED 0 /* Offset of Red in an RGB scanline element */
337#define RGB_GREEN 1 /* Offset of Green */
338#define RGB_BLUE 2 /* Offset of Blue */
339#ifdef ANDROID_RGB
340#define RGB_ALPHA 3 /* Offset of Alpha */
341#endif
342#define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */
343
344/* Definitions for speed-related optimizations. */
345
346
347/* If your compiler supports inline functions, define INLINE
348 * as the inline keyword; otherwise define it as empty.
349 */
350
351#ifndef INLINE
352#ifdef __GNUC__ /* for instance, GNU C knows about inline */
353#define INLINE __inline__
354#endif
355#ifndef INLINE
356#define INLINE /* default is to define it as empty */
357#endif
358#endif
359
360
361/* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
362 * two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER
363 * as short on such a machine. MULTIPLIER must be at least 16 bits wide.
364 */
365
366#ifndef MULTIPLIER
367#define MULTIPLIER int /* type for fastest integer multiply */
368#endif
369
370
371/* FAST_FLOAT should be either float or double, whichever is done faster
372 * by your compiler. (Note that this type is only used in the floating point
373 * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
374 * Typically, float is faster in ANSI C compilers, while double is faster in
375 * pre-ANSI compilers (because they insist on converting to double anyway).
376 * The code below therefore chooses float if we have ANSI-style prototypes.
377 */
378
379#ifndef FAST_FLOAT
380#ifdef HAVE_PROTOTYPES
381#define FAST_FLOAT float
382#else
383#define FAST_FLOAT double
384#endif
385#endif
386
387#endif /* JPEG_INTERNAL_OPTIONS */