[wxWidgets.git] / src / jpeg / jmorecfg.h

/*
 * jmorecfg.h
 *
 * Copyright (C) 1991-1997, Thomas G. Lane.
 * 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. */

/* Modified JACS 23/4/99. 1200 means VC++ 6 */
#if !defined(XMD_H) && !(_MSC_VER >= 1200)			/* X11/xmd.h correctly defines INT32 */
typedef long INT32;
#endif

/* Added JACS 23/4/99, to get INT32 definition */
#if (_MSC_VER >= 1200)
#include <windows.h>
#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.
 */

#if defined(__VISAGECPP__) && !defined(JPEGLOCAL) /* need this for /common/imagjpeg.obj but not loclly */
/* a function called through method pointers: */
#define METHODDEF(type)		static type _Optlink
/* a function used only in its module: */
#define LOCAL(type)		static type _Optlink
/* a function referenced thru EXTERNs: */
#define GLOBAL(type)		type
/* a reference to a GLOBAL function: */
#define EXTERN(type)		extern type _Optlink
#else
/* 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
#endif

/* 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.
 */

#ifdef NEED_FAR_POINTERS
#define FAR  far
#else
#define FAR
#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.)
 */

/* Arithmetic coding is unsupported for legal reasons.  Complaints to IBM. */

/* 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: */

#undef  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 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: */

#undef  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 SAVE_MARKERS_SUPPORTED	    /* jpeg_save_markers() needed? */
#define BLOCK_SMOOTHING_SUPPORTED   /* Block smoothing? (Progressive only) */
#define IDCT_SCALING_SUPPORTED	    /* Output rescaling via IDCT? */
#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 */
Commit	Line	Data
e1929140 RR	1	/*
	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	/*
	15	* Define BITS_IN_JSAMPLE as either
	16	* 8 for 8-bit sample values (the usual setting)
	17	* 12 for 12-bit sample values
	18	* Only 8 and 12 are legal data precisions for lossy JPEG according to the
	19	* JPEG standard, and the IJG code does not support anything else!
	20	* We do not support run-time selection of data precision, sorry.
	21	*/
	22
	23	#define BITS_IN_JSAMPLE 8 /* use 8 or 12 */
	24
	25
	26	/*
	27	* Maximum number of components (color channels) allowed in JPEG image.
	28	* To meet the letter of the JPEG spec, set this to 255. However, darn
	29	* few applications need more than 4 channels (maybe 5 for CMYK + alpha
	30	* mask). We recommend 10 as a reasonable compromise; use 4 if you are
	31	* really short on memory. (Each allowed component costs a hundred or so
	32	* bytes of storage, whether actually used in an image or not.)
	33	*/
	34
	35	#define MAX_COMPONENTS 10 /* maximum number of image components */
	36
	37
	38	/*
	39	* Basic data types.
	40	* You may need to change these if you have a machine with unusual data
	41	* type sizes; for example, "char" not 8 bits, "short" not 16 bits,
	42	* or "long" not 32 bits. We don't care whether "int" is 16 or 32 bits,
	43	* but it had better be at least 16.
	44	*/
	45
	46	/* Representation of a single sample (pixel element value).
	47	* We frequently allocate large arrays of these, so it's important to keep
	48	* them small. But if you have memory to burn and access to char or short
	49	* arrays is very slow on your hardware, you might want to change these.
	50	*/
	51
	52	#if BITS_IN_JSAMPLE == 8
	53	/* JSAMPLE should be the smallest type that will hold the values 0..255.
	54	* You can use a signed char by having GETJSAMPLE mask it with 0xFF.
	55	*/
	56
	57	#ifdef HAVE_UNSIGNED_CHAR
	58
	59	typedef unsigned char JSAMPLE;
	60	#define GETJSAMPLE(value) ((int) (value))
	61
	62	#else /* not HAVE_UNSIGNED_CHAR */
	63
	64	typedef char JSAMPLE;
65	#ifdef CHAR_IS_UNSIGNED
66	#define GETJSAMPLE(value) ((int) (value))
67	#else
68	#define GETJSAMPLE(value) ((int) (value) & 0xFF)
69	#endif /* CHAR_IS_UNSIGNED */
70
71	#endif /* HAVE_UNSIGNED_CHAR */
72
73	#define MAXJSAMPLE 255
74	#define CENTERJSAMPLE 128
75
76	#endif /* BITS_IN_JSAMPLE == 8 */
77
78
79	#if BITS_IN_JSAMPLE == 12
80	/* JSAMPLE should be the smallest type that will hold the values 0..4095.
81	* On nearly all machines "short" will do nicely.
82	*/
83
84	typedef short JSAMPLE;
85	#define GETJSAMPLE(value) ((int) (value))
86
87	#define MAXJSAMPLE 4095
88	#define CENTERJSAMPLE 2048
89
90	#endif /* BITS_IN_JSAMPLE == 12 */
91
92
93	/* Representation of a DCT frequency coefficient.
94	* This should be a signed value of at least 16 bits; "short" is usually OK.
95	* Again, we allocate large arrays of these, but you can change to int
96	* if you have memory to burn and "short" is really slow.
97	*/
98
99	typedef short JCOEF;
100
101
102	/* Compressed datastreams are represented as arrays of JOCTET.
103	* These must be EXACTLY 8 bits wide, at least once they are written to
104	* external storage. Note that when using the stdio data source/destination
105	* managers, this is also the data type passed to fread/fwrite.
106	*/
107
108	#ifdef HAVE_UNSIGNED_CHAR
109
110	typedef unsigned char JOCTET;
111	#define GETJOCTET(value) (value)
112
113	#else /* not HAVE_UNSIGNED_CHAR */
114
115	typedef char JOCTET;
116	#ifdef CHAR_IS_UNSIGNED
117	#define GETJOCTET(value) (value)
118	#else
119	#define GETJOCTET(value) ((value) & 0xFF)
120	#endif /* CHAR_IS_UNSIGNED */
121
122	#endif /* HAVE_UNSIGNED_CHAR */
123
124
125	/* These typedefs are used for various table entries and so forth.
126	* They must be at least as wide as specified; but making them too big
127	* won't cost a huge amount of memory, so we don't provide special
128	* extraction code like we did for JSAMPLE. (In other words, these
129	* typedefs live at a different point on the speed/space tradeoff curve.)
130	*/
131
132	/* UINT8 must hold at least the values 0..255. */
133
134	#ifdef HAVE_UNSIGNED_CHAR
135	typedef unsigned char UINT8;
136	#else /* not HAVE_UNSIGNED_CHAR */
137	#ifdef CHAR_IS_UNSIGNED
138	typedef char UINT8;
139	#else /* not CHAR_IS_UNSIGNED */
140	typedef short UINT8;
141	#endif /* CHAR_IS_UNSIGNED */
142	#endif /* HAVE_UNSIGNED_CHAR */
143
144	/* UINT16 must hold at least the values 0..65535. */
145
146	#ifdef HAVE_UNSIGNED_SHORT
147	typedef unsigned short UINT16;
148	#else /* not HAVE_UNSIGNED_SHORT */
149	typedef unsigned int UINT16;
150	#endif /* HAVE_UNSIGNED_SHORT */
151
152	/* INT16 must hold at least the values -32768..32767. */
153
154	#ifndef XMD_H /* X11/xmd.h correctly defines INT16 */
155	typedef short INT16;
156	#endif
157
158	/* INT32 must hold at least signed 32-bit values. */
159
ea64e17a JS	160	/* Modified JACS 23/4/99. 1200 means VC++ 6 */
ea64e17a JS	161	#if !defined(XMD_H) && !(_MSC_VER >= 1200) /* X11/xmd.h correctly defines INT32 */
e1929140 RR	162	typedef long INT32;
	163	#endif
	164
ea64e17a JS	165	/* Added JACS 23/4/99, to get INT32 definition */
	166	#if (_MSC_VER >= 1200)
	167	#include <windows.h>
	168	#endif
	169
e1929140 RR	170	/* Datatype used for image dimensions. The JPEG standard only supports
	171	* images up to 64K*64K due to 16-bit fields in SOF markers. Therefore
	172	* "unsigned int" is sufficient on all machines. However, if you need to
	173	* handle larger images and you don't mind deviating from the spec, you
	174	* can change this datatype.
	175	*/
	176
	177	typedef unsigned int JDIMENSION;
	178
	179	#define JPEG_MAX_DIMENSION 65500L /* a tad under 64K to prevent overflows */
	180
	181
	182	/* These macros are used in all function definitions and extern declarations.
	183	* You could modify them if you need to change function linkage conventions;
	184	* in particular, you'll need to do that to make the library a Windows DLL.
	185	* Another application is to make all functions global for use with debuggers
	186	* or code profilers that require it.
	187	*/
	188
50c375d3 DW	189	#if defined(__VISAGECPP__) && !defined(JPEGLOCAL) /* need this for /common/imagjpeg.obj but not loclly */
	190	/* a function called through method pointers: */
	191	#define METHODDEF(type) static type _Optlink
	192	/* a function used only in its module: */
	193	#define LOCAL(type) static type _Optlink
	194	/* a function referenced thru EXTERNs: */
	195	#define GLOBAL(type) type
	196	/* a reference to a GLOBAL function: */
	197	#define EXTERN(type) extern type _Optlink
	198	#else
e1929140 RR	199	/* a function called through method pointers: */
	200	#define METHODDEF(type) static type
	201	/* a function used only in its module: */
	202	#define LOCAL(type) static type
	203	/* a function referenced thru EXTERNs: */
	204	#define GLOBAL(type) type
	205	/* a reference to a GLOBAL function: */
	206	#define EXTERN(type) extern type
50c375d3	207	#endif
e1929140 RR	208
	209	/* This macro is used to declare a "method", that is, a function pointer.
	210	* We want to supply prototype parameters if the compiler can cope.
	211	* Note that the arglist parameter must be parenthesized!
	212	* Again, you can customize this if you need special linkage keywords.
	213	*/
	214
	215	#ifdef HAVE_PROTOTYPES
	216	#define JMETHOD(type,methodname,arglist) type (*methodname) arglist
	217	#else
	218	#define JMETHOD(type,methodname,arglist) type (*methodname) ()
	219	#endif
	220
	221
	222	/* Here is the pseudo-keyword for declaring pointers that must be "far"
	223	* on 80x86 machines. Most of the specialized coding for 80x86 is handled
	224	* by just saying "FAR *" where such a pointer is needed. In a few places
	225	* explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
	226	*/
	227
	228	#ifdef NEED_FAR_POINTERS
	229	#define FAR far
	230	#else
	231	#define FAR
	232	#endif
	233
	234
	235	/*
	236	* On a few systems, type boolean and/or its values FALSE, TRUE may appear
	237	* in standard header files. Or you may have conflicts with application-
	238	* specific header files that you want to include together with these files.
	239	* Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
	240	*/
	241
	242	#ifndef HAVE_BOOLEAN
	243	typedef int boolean;
	244	#endif
	245	#ifndef FALSE /* in case these macros already exist */
	246	#define FALSE 0 /* values of boolean */
	247	#endif
	248	#ifndef TRUE
	249	#define TRUE 1
	250	#endif
	251
	252
	253	/*
	254	* The remaining options affect code selection within the JPEG library,
	255	* but they don't need to be visible to most applications using the library.
	256	* To minimize application namespace pollution, the symbols won't be
	257	* defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
	258	*/
	259
	260	#ifdef JPEG_INTERNALS
	261	#define JPEG_INTERNAL_OPTIONS
	262	#endif
	263
	264	#ifdef JPEG_INTERNAL_OPTIONS
	265
	266
	267	/*
	268	* These defines indicate whether to include various optional functions.
	269	* Undefining some of these symbols will produce a smaller but less capable
	270	* library. Note that you can leave certain source files out of the
	271	* compilation/linking process if you've #undef'd the corresponding symbols.
272	* (You may HAVE to do that if your compiler doesn't like null source files.)
273	*/
274
275	/* Arithmetic coding is unsupported for legal reasons. Complaints to IBM. */
276
277	/* Capability options common to encoder and decoder: */
278
279	#define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */
280	#define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */
281	#define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */
282
283	/* Encoder capability options: */
284
285	#undef C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
286	#define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
287	#define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
288	#define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */
289	/* Note: if you selected 12-bit data precision, it is dangerous to turn off
290	* ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit
291	* precision, so jchuff.c normally uses entropy optimization to compute
292	* usable tables for higher precision. If you don't want to do optimization,
293	* you'll have to supply different default Huffman tables.
294	* The exact same statements apply for progressive JPEG: the default tables
295	* don't work for progressive mode. (This may get fixed, however.)
296	*/
297	#define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */
298
299	/* Decoder capability options: */
300
301	#undef D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
302	#define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
303	#define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
304	#define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */
305	#define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */
306	#define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */
307	#undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */
308	#define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */
309	#define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */
310	#define QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */
311
312	/* more capability options later, no doubt */
313
314
315	/*
316	* Ordering of RGB data in scanlines passed to or from the application.
317	* If your application wants to deal with data in the order B,G,R, just
318	* change these macros. You can also deal with formats such as R,G,B,X
319	* (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing
320	* the offsets will also change the order in which colormap data is organized.
321	* RESTRICTIONS:
322	* 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
323	* 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
324	* useful if you are using JPEG color spaces other than YCbCr or grayscale.
325	* 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
326	* is not 3 (they don't understand about dummy color components!). So you
327	* can't use color quantization if you change that value.
328	*/
329
330	#define RGB_RED 0 /* Offset of Red in an RGB scanline element */
331	#define RGB_GREEN 1 /* Offset of Green */
332	#define RGB_BLUE 2 /* Offset of Blue */
333	#define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */
334
335
336	/* Definitions for speed-related optimizations. */
337
338
339	/* If your compiler supports inline functions, define INLINE
340	* as the inline keyword; otherwise define it as empty.
341	*/
342
343	#ifndef INLINE
344	#ifdef __GNUC__ /* for instance, GNU C knows about inline */
345	#define INLINE __inline__
346	#endif
347	#ifndef INLINE
348	#define INLINE /* default is to define it as empty */
349	#endif
350	#endif
351
352
353	/* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
354	* two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER
355	* as short on such a machine. MULTIPLIER must be at least 16 bits wide.
356	*/
357
358	#ifndef MULTIPLIER
359	#define MULTIPLIER int /* type for fastest integer multiply */
360	#endif
361
362
363	/* FAST_FLOAT should be either float or double, whichever is done faster
364	* by your compiler. (Note that this type is only used in the floating point
365	* DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
366	* Typically, float is faster in ANSI C compilers, while double is faster in
367	* pre-ANSI compilers (because they insist on converting to double anyway).
368	* The code below therefore chooses float if we have ANSI-style prototypes.
369	*/
370
371	#ifndef FAST_FLOAT
372	#ifdef HAVE_PROTOTYPES
373	#define FAST_FLOAT float
374	#else
375	#define FAST_FLOAT double
376	#endif
377	#endif
378
379	#endif /* JPEG_INTERNAL_OPTIONS */