3rdparty/libjpeg/jmorecfg.h

/*
 * jmorecfg.h
 *
 * Copyright (C) 1991-1997, Thomas G. Lane.
 * Modified 1997-2009 by Guido Vollbeding.
 * This file is part of the Independent JPEG Group's software.
 * For conditions of distribution and use, see the accompanying README file.
 *
 * This file contains additional configuration options that customize the
 * JPEG software for special applications or support machine-dependent
 * optimizations.  Most users will not need to touch this file.
 */


/*
 * Define BITS_IN_JSAMPLE as either
 *   8   for 8-bit sample values (the usual setting)
 *   12  for 12-bit sample values
 * Only 8 and 12 are legal data precisions for lossy JPEG according to the
 * JPEG standard, and the IJG code does not support anything else!
 * We do not support run-time selection of data precision, sorry.
 */

#define BITS_IN_JSAMPLE  8      /* use 8 or 12 */


/*
 * Maximum number of components (color channels) allowed in JPEG image.
 * To meet the letter of the JPEG spec, set this to 255.  However, darn
 * few applications need more than 4 channels (maybe 5 for CMYK + alpha
 * mask).  We recommend 10 as a reasonable compromise; use 4 if you are
 * really short on memory.  (Each allowed component costs a hundred or so
 * bytes of storage, whether actually used in an image or not.)
 */

#define MAX_COMPONENTS  10      /* maximum number of image components */


/*
 * Basic data types.
 * You may need to change these if you have a machine with unusual data
 * type sizes; for example, "char" not 8 bits, "short" not 16 bits,
 * or "long" not 32 bits.  We don't care whether "int" is 16 or 32 bits,
 * but it had better be at least 16.
 */

/* Representation of a single sample (pixel element value).
 * We frequently allocate large arrays of these, so it's important to keep
 * them small.  But if you have memory to burn and access to char or short
 * arrays is very slow on your hardware, you might want to change these.
 */

#if BITS_IN_JSAMPLE == 8
/* JSAMPLE should be the smallest type that will hold the values 0..255.
 * You can use a signed char by having GETJSAMPLE mask it with 0xFF.
 */

#ifdef HAVE_UNSIGNED_CHAR

typedef unsigned char JSAMPLE;
#define GETJSAMPLE(value)  ((int) (value))

#else /* not HAVE_UNSIGNED_CHAR */

typedef char JSAMPLE;
#ifdef CHAR_IS_UNSIGNED
#define GETJSAMPLE(value)  ((int) (value))
#else
#define GETJSAMPLE(value)  ((int) (value) & 0xFF)
#endif /* CHAR_IS_UNSIGNED */

#endif /* HAVE_UNSIGNED_CHAR */

#define MAXJSAMPLE      255
#define CENTERJSAMPLE   128

#endif /* BITS_IN_JSAMPLE == 8 */


#if BITS_IN_JSAMPLE == 12
/* JSAMPLE should be the smallest type that will hold the values 0..4095.
 * On nearly all machines "short" will do nicely.
 */

typedef short JSAMPLE;
#define GETJSAMPLE(value)  ((int) (value))

#define MAXJSAMPLE      4095
#define CENTERJSAMPLE   2048

#endif /* BITS_IN_JSAMPLE == 12 */


/* Representation of a DCT frequency coefficient.
 * This should be a signed value of at least 16 bits; "short" is usually OK.
 * Again, we allocate large arrays of these, but you can change to int
 * if you have memory to burn and "short" is really slow.
 */

typedef short JCOEF;


/* Compressed datastreams are represented as arrays of JOCTET.
 * These must be EXACTLY 8 bits wide, at least once they are written to
 * external storage.  Note that when using the stdio data source/destination
 * managers, this is also the data type passed to fread/fwrite.
 */

#ifdef HAVE_UNSIGNED_CHAR

typedef unsigned char JOCTET;
#define GETJOCTET(value)  (value)

#else /* not HAVE_UNSIGNED_CHAR */

typedef char JOCTET;
#ifdef CHAR_IS_UNSIGNED
#define GETJOCTET(value)  (value)
#else
#define GETJOCTET(value)  ((value) & 0xFF)
#endif /* CHAR_IS_UNSIGNED */

#endif /* HAVE_UNSIGNED_CHAR */


/* These typedefs are used for various table entries and so forth.
 * They must be at least as wide as specified; but making them too big
 * won't cost a huge amount of memory, so we don't provide special
 * extraction code like we did for JSAMPLE.  (In other words, these
 * typedefs live at a different point on the speed/space tradeoff curve.)
 */

/* UINT8 must hold at least the values 0..255. */

#ifdef HAVE_UNSIGNED_CHAR
typedef unsigned char UINT8;
#else /* not HAVE_UNSIGNED_CHAR */
#ifdef CHAR_IS_UNSIGNED
typedef char UINT8;
#else /* not CHAR_IS_UNSIGNED */
typedef short UINT8;
#endif /* CHAR_IS_UNSIGNED */
#endif /* HAVE_UNSIGNED_CHAR */

/* UINT16 must hold at least the values 0..65535. */

#ifdef HAVE_UNSIGNED_SHORT
typedef unsigned short UINT16;
#else /* not HAVE_UNSIGNED_SHORT */
typedef unsigned int UINT16;
#endif /* HAVE_UNSIGNED_SHORT */

/* INT16 must hold at least the values -32768..32767. */

#ifndef XMD_H                   /* X11/xmd.h correctly defines INT16 */
typedef short INT16;
#endif

/* INT32 must hold at least signed 32-bit values. */

#ifndef XMD_H                   /* X11/xmd.h correctly defines INT32 */
#ifndef _BASETSD_H_             /* Microsoft defines it in basetsd.h */
#ifndef QGLOBAL_H               /* Qt defines it in qglobal.h */
typedef long INT32;
#endif
#endif
#endif

/* Datatype used for image dimensions.  The JPEG standard only supports
 * images up to 64K*64K due to 16-bit fields in SOF markers.  Therefore
 * "unsigned int" is sufficient on all machines.  However, if you need to
 * handle larger images and you don't mind deviating from the spec, you
 * can change this datatype.
 */

typedef unsigned int JDIMENSION;

#define JPEG_MAX_DIMENSION  65500L  /* a tad under 64K to prevent overflows */


/* These macros are used in all function definitions and extern declarations.
 * You could modify them if you need to change function linkage conventions;
 * in particular, you'll need to do that to make the library a Windows DLL.
 * Another application is to make all functions global for use with debuggers
 * or code profilers that require it.
 */

/* a function called through method pointers: */
#define METHODDEF(type)         static type
/* a function used only in its module: */
#define LOCAL(type)             static type
/* a function referenced thru EXTERNs: */
#define GLOBAL(type)            type
/* a reference to a GLOBAL function: */
#define EXTERN(type)            extern type


/* This macro is used to declare a "method", that is, a function pointer.
 * We want to supply prototype parameters if the compiler can cope.
 * Note that the arglist parameter must be parenthesized!
 * Again, you can customize this if you need special linkage keywords.
 */

#ifdef HAVE_PROTOTYPES
#define JMETHOD(type,methodname,arglist)  type (*methodname) arglist
#else
#define JMETHOD(type,methodname,arglist)  type (*methodname) ()
#endif


/* Here is the pseudo-keyword for declaring pointers that must be "far"
 * on 80x86 machines.  Most of the specialized coding for 80x86 is handled
 * by just saying "FAR *" where such a pointer is needed.  In a few places
 * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
 */

#ifndef FAR
#ifdef NEED_FAR_POINTERS
#define FAR  far
#else
#define FAR
#endif
#endif


/*
 * On a few systems, type boolean and/or its values FALSE, TRUE may appear
 * in standard header files.  Or you may have conflicts with application-
 * specific header files that you want to include together with these files.
 * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
 */

#ifndef HAVE_BOOLEAN
typedef int boolean;
#endif
#ifndef FALSE                   /* in case these macros already exist */
#define FALSE   0               /* values of boolean */
#endif
#ifndef TRUE
#define TRUE    1
#endif


/*
 * The remaining options affect code selection within the JPEG library,
 * but they don't need to be visible to most applications using the library.
 * To minimize application namespace pollution, the symbols won't be
 * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
 */

#ifdef JPEG_INTERNALS
#define JPEG_INTERNAL_OPTIONS
#endif

#ifdef JPEG_INTERNAL_OPTIONS


/*
 * These defines indicate whether to include various optional functions.
 * Undefining some of these symbols will produce a smaller but less capable
 * library.  Note that you can leave certain source files out of the
 * compilation/linking process if you've #undef'd the corresponding symbols.
 * (You may HAVE to do that if your compiler doesn't like null source files.)
 */

/* Capability options common to encoder and decoder: */

#define DCT_ISLOW_SUPPORTED     /* slow but accurate integer algorithm */
#define DCT_IFAST_SUPPORTED     /* faster, less accurate integer method */
#define DCT_FLOAT_SUPPORTED     /* floating-point: accurate, fast on fast HW */

/* Encoder capability options: */

#define C_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */
#define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
#define C_PROGRESSIVE_SUPPORTED     /* Progressive JPEG? (Requires MULTISCAN)*/
#define DCT_SCALING_SUPPORTED       /* Input rescaling via DCT? (Requires DCT_ISLOW)*/
#define ENTROPY_OPT_SUPPORTED       /* Optimization of entropy coding parms? */
/* Note: if you selected 12-bit data precision, it is dangerous to turn off
 * ENTROPY_OPT_SUPPORTED.  The standard Huffman tables are only good for 8-bit
 * precision, so jchuff.c normally uses entropy optimization to compute
 * usable tables for higher precision.  If you don't want to do optimization,
 * you'll have to supply different default Huffman tables.
 * The exact same statements apply for progressive JPEG: the default tables
 * don't work for progressive mode.  (This may get fixed, however.)
 */
#define INPUT_SMOOTHING_SUPPORTED   /* Input image smoothing option? */

/* Decoder capability options: */

#define D_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */
#define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
#define D_PROGRESSIVE_SUPPORTED     /* Progressive JPEG? (Requires MULTISCAN)*/
#define IDCT_SCALING_SUPPORTED      /* Output rescaling via IDCT? */
#define SAVE_MARKERS_SUPPORTED      /* jpeg_save_markers() needed? */
#define BLOCK_SMOOTHING_SUPPORTED   /* Block smoothing? (Progressive only) */
#undef  UPSAMPLE_SCALING_SUPPORTED  /* Output rescaling at upsample stage? */
#define UPSAMPLE_MERGING_SUPPORTED  /* Fast path for sloppy upsampling? */
#define QUANT_1PASS_SUPPORTED       /* 1-pass color quantization? */
#define QUANT_2PASS_SUPPORTED       /* 2-pass color quantization? */

/* more capability options later, no doubt */


/*
 * Ordering of RGB data in scanlines passed to or from the application.
 * If your application wants to deal with data in the order B,G,R, just
 * change these macros.  You can also deal with formats such as R,G,B,X
 * (one extra byte per pixel) by changing RGB_PIXELSIZE.  Note that changing
 * the offsets will also change the order in which colormap data is organized.
 * RESTRICTIONS:
 * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
 * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
 *    useful if you are using JPEG color spaces other than YCbCr or grayscale.
 * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
 *    is not 3 (they don't understand about dummy color components!).  So you
 *    can't use color quantization if you change that value.
 */

#define RGB_RED         0       /* Offset of Red in an RGB scanline element */
#define RGB_GREEN       1       /* Offset of Green */
#define RGB_BLUE        2       /* Offset of Blue */
#define RGB_PIXELSIZE   3       /* JSAMPLEs per RGB scanline element */


/* Definitions for speed-related optimizations. */


/* If your compiler supports inline functions, define INLINE
 * as the inline keyword; otherwise define it as empty.
 */

#ifndef INLINE
#ifdef __GNUC__                 /* for instance, GNU C knows about inline */
#define INLINE __inline__
#endif
#ifndef INLINE
#define INLINE                  /* default is to define it as empty */
#endif
#endif


/* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
 * two 16-bit shorts is faster than multiplying two ints.  Define MULTIPLIER
 * as short on such a machine.  MULTIPLIER must be at least 16 bits wide.
 */

#ifndef MULTIPLIER
#define MULTIPLIER  int         /* type for fastest integer multiply */
#endif


/* FAST_FLOAT should be either float or double, whichever is done faster
 * by your compiler.  (Note that this type is only used in the floating point
 * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
 * Typically, float is faster in ANSI C compilers, while double is faster in
 * pre-ANSI compilers (because they insist on converting to double anyway).
 * The code below therefore chooses float if we have ANSI-style prototypes.
 */

#ifndef FAST_FLOAT
#ifdef HAVE_PROTOTYPES
#define FAST_FLOAT  float
#else
#define FAST_FLOAT  double
#endif
#endif

#endif /* JPEG_INTERNAL_OPTIONS */
1	/*
2	* jmorecfg.h
3	*
4	* Copyright (C) 1991-1997, Thomas G. Lane.
5	* Modified 1997-2009 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
60	typedef unsigned char JSAMPLE;
61	#define GETJSAMPLE(value) ((int) (value))
62
63	#else /* not HAVE_UNSIGNED_CHAR */
64
65	typedef 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
85	typedef 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
100	typedef 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
111	typedef unsigned char JOCTET;
112	#define GETJOCTET(value) (value)
113
114	#else /* not HAVE_UNSIGNED_CHAR */
115
116	typedef 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
136	typedef unsigned char UINT8;
137	#else /* not HAVE_UNSIGNED_CHAR */
138	#ifdef CHAR_IS_UNSIGNED
139	typedef char UINT8;
140	#else /* not CHAR_IS_UNSIGNED */
141	typedef 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
148	typedef unsigned short UINT16;
149	#else /* not HAVE_UNSIGNED_SHORT */
150	typedef 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 */
156	typedef 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 QGLOBAL_H /* Qt defines it in qglobal.h */
164	typedef long INT32;
165	#endif
166	#endif
167	#endif
168
169	/* Datatype used for image dimensions. The JPEG standard only supports
170	* images up to 64K*64K due to 16-bit fields in SOF markers. Therefore
171	* "unsigned int" is sufficient on all machines. However, if you need to
172	* handle larger images and you don't mind deviating from the spec, you
173	* can change this datatype.
174	*/
175
176	typedef unsigned int JDIMENSION;
177
178	#define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */
179
180
181	/* These macros are used in all function definitions and extern declarations.
182	* You could modify them if you need to change function linkage conventions;
183	* in particular, you'll need to do that to make the library a Windows DLL.
184	* Another application is to make all functions global for use with debuggers
185	* or code profilers that require it.
186	*/
187
188	/* a function called through method pointers: */
189	#define METHODDEF(type) static type
190	/* a function used only in its module: */
191	#define LOCAL(type) static type
192	/* a function referenced thru EXTERNs: */
193	#define GLOBAL(type) type
194	/* a reference to a GLOBAL function: */
195	#define EXTERN(type) extern type
196
197
198	/* This macro is used to declare a "method", that is, a function pointer.
199	* We want to supply prototype parameters if the compiler can cope.
200	* Note that the arglist parameter must be parenthesized!
201	* Again, you can customize this if you need special linkage keywords.
202	*/
203
204	#ifdef HAVE_PROTOTYPES
205	#define JMETHOD(type,methodname,arglist) type (*methodname) arglist
206	#else
207	#define JMETHOD(type,methodname,arglist) type (*methodname) ()
208	#endif
209
210
211	/* Here is the pseudo-keyword for declaring pointers that must be "far"
212	* on 80x86 machines. Most of the specialized coding for 80x86 is handled
213	* by just saying "FAR *" where such a pointer is needed. In a few places
214	* explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
215	*/
216
217	#ifndef FAR
218	#ifdef NEED_FAR_POINTERS
219	#define FAR far
220	#else
221	#define FAR
222	#endif
223	#endif
224
225
226	/*
227	* On a few systems, type boolean and/or its values FALSE, TRUE may appear
228	* in standard header files. Or you may have conflicts with application-
229	* specific header files that you want to include together with these files.
230	* Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
231	*/
232
233	#ifndef HAVE_BOOLEAN
234	typedef int boolean;
235	#endif
236	#ifndef FALSE /* in case these macros already exist */
237	#define FALSE 0 /* values of boolean */
238	#endif
239	#ifndef TRUE
240	#define TRUE 1
241	#endif
242
243
244	/*
245	* The remaining options affect code selection within the JPEG library,
246	* but they don't need to be visible to most applications using the library.
247	* To minimize application namespace pollution, the symbols won't be
248	* defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
249	*/
250
251	#ifdef JPEG_INTERNALS
252	#define JPEG_INTERNAL_OPTIONS
253	#endif
254
255	#ifdef JPEG_INTERNAL_OPTIONS
256
257
258	/*
259	* These defines indicate whether to include various optional functions.
260	* Undefining some of these symbols will produce a smaller but less capable
261	* library. Note that you can leave certain source files out of the
262	* compilation/linking process if you've #undef'd the corresponding symbols.
263	* (You may HAVE to do that if your compiler doesn't like null source files.)
264	*/
265
266	/* Capability options common to encoder and decoder: */
267
268	#define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */
269	#define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */
270	#define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */
271
272	/* Encoder capability options: */
273
274	#define C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
275	#define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
276	#define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
277	#define DCT_SCALING_SUPPORTED /* Input rescaling via DCT? (Requires DCT_ISLOW)*/
278	#define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */
279	/* Note: if you selected 12-bit data precision, it is dangerous to turn off
280	* ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit
281	* precision, so jchuff.c normally uses entropy optimization to compute
282	* usable tables for higher precision. If you don't want to do optimization,
283	* you'll have to supply different default Huffman tables.
284	* The exact same statements apply for progressive JPEG: the default tables
285	* don't work for progressive mode. (This may get fixed, however.)
286	*/
287	#define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */
288
289	/* Decoder capability options: */
290
291	#define D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
292	#define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
293	#define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
294	#define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */
295	#define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */
296	#define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */
297	#undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */
298	#define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */
299	#define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */
300	#define QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */
301
302	/* more capability options later, no doubt */
303
304
305	/*
306	* Ordering of RGB data in scanlines passed to or from the application.
307	* If your application wants to deal with data in the order B,G,R, just
308	* change these macros. You can also deal with formats such as R,G,B,X
309	* (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing
310	* the offsets will also change the order in which colormap data is organized.
311	* RESTRICTIONS:
312	* 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
313	* 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
314	* useful if you are using JPEG color spaces other than YCbCr or grayscale.
315	* 3. 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 */