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__)
/* 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
	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
	160	/* Modified JACS 23/4/99. 1200 means VC++ 6 */
	161	#if !defined(XMD_H) && !(_MSC_VER >= 1200) /* X11/xmd.h correctly defines INT32 */
	162	typedef long INT32;
	163	#endif
	164
	165	/* Added JACS 23/4/99, to get INT32 definition */
	166	#if (_MSC_VER >= 1200)
	167	#include <windows.h>
	168	#endif
	169
	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
	189	#if defined(__VISAGECPP__)
	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
	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
	207	#endif
	208
	209
	210
	211	/* This macro is used to declare a "method", that is, a function pointer.
	212	* We want to supply prototype parameters if the compiler can cope.
	213	* Note that the arglist parameter must be parenthesized!
	214	* Again, you can customize this if you need special linkage keywords.
	215	*/
	216
	217	#ifdef HAVE_PROTOTYPES
	218	#define JMETHOD(type,methodname,arglist) type (*methodname) arglist
	219	#else
	220	#define JMETHOD(type,methodname,arglist) type (*methodname) ()
	221	#endif
	222
	223
	224	/* Here is the pseudo-keyword for declaring pointers that must be "far"
	225	* on 80x86 machines. Most of the specialized coding for 80x86 is handled
	226	* by just saying "FAR *" where such a pointer is needed. In a few places
	227	* explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
	228	*/
	229
	230	#ifdef NEED_FAR_POINTERS
	231	#define FAR far
	232	#else
	233	#define FAR
	234	#endif
	235
	236
	237	/*
	238	* On a few systems, type boolean and/or its values FALSE, TRUE may appear
	239	* in standard header files. Or you may have conflicts with application-
	240	* specific header files that you want to include together with these files.
	241	* Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
	242	*/
	243
	244	#ifndef HAVE_BOOLEAN
	245	typedef int boolean;
	246	#endif
	247	#ifndef FALSE /* in case these macros already exist */
	248	#define FALSE 0 /* values of boolean */
	249	#endif
	250	#ifndef TRUE
	251	#define TRUE 1
	252	#endif
	253
	254
	255	/*
	256	* The remaining options affect code selection within the JPEG library,
	257	* but they don't need to be visible to most applications using the library.
	258	* To minimize application namespace pollution, the symbols won't be
	259	* defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
	260	*/
	261
	262	#ifdef JPEG_INTERNALS
	263	#define JPEG_INTERNAL_OPTIONS
	264	#endif
	265
	266	#ifdef JPEG_INTERNAL_OPTIONS
	267
	268
	269	/*
	270	* These defines indicate whether to include various optional functions.
	271	* Undefining some of these symbols will produce a smaller but less capable
	272	* library. Note that you can leave certain source files out of the
	273	* compilation/linking process if you've #undef'd the corresponding symbols.
	274	* (You may HAVE to do that if your compiler doesn't like null source files.)
	275	*/
	276
	277	/* Arithmetic coding is unsupported for legal reasons. Complaints to IBM. */
	278
	279	/* Capability options common to encoder and decoder: */
	280
	281	#define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */
	282	#define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */
	283	#define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW */
	284
	285	/* Encoder capability options: */
	286
	287	#undef C_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
	288	#define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
	289	#define C_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
	290	#define ENTROPY_OPT_SUPPORTED /* Optimization of entropy coding parms? */
	291	/* Note: if you selected 12-bit data precision, it is dangerous to turn off
	292	* ENTROPY_OPT_SUPPORTED. The standard Huffman tables are only good for 8-bit
	293	* precision, so jchuff.c normally uses entropy optimization to compute
	294	* usable tables for higher precision. If you don't want to do optimization,
	295	* you'll have to supply different default Huffman tables.
	296	* The exact same statements apply for progressive JPEG: the default tables
	297	* don't work for progressive mode. (This may get fixed, however.)
	298	*/
	299	#define INPUT_SMOOTHING_SUPPORTED /* Input image smoothing option? */
	300
	301	/* Decoder capability options: */
	302
	303	#undef D_ARITH_CODING_SUPPORTED /* Arithmetic coding back end? */
	304	#define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
	305	#define D_PROGRESSIVE_SUPPORTED /* Progressive JPEG? (Requires MULTISCAN)*/
	306	#define SAVE_MARKERS_SUPPORTED /* jpeg_save_markers() needed? */
	307	#define BLOCK_SMOOTHING_SUPPORTED /* Block smoothing? (Progressive only) */
	308	#define IDCT_SCALING_SUPPORTED /* Output rescaling via IDCT? */
	309	#undef UPSAMPLE_SCALING_SUPPORTED /* Output rescaling at upsample stage? */
	310	#define UPSAMPLE_MERGING_SUPPORTED /* Fast path for sloppy upsampling? */
	311	#define QUANT_1PASS_SUPPORTED /* 1-pass color quantization? */
	312	#define QUANT_2PASS_SUPPORTED /* 2-pass color quantization? */
	313
	314	/* more capability options later, no doubt */
	315
	316
	317	/*
	318	* Ordering of RGB data in scanlines passed to or from the application.
	319	* If your application wants to deal with data in the order B,G,R, just
	320	* change these macros. You can also deal with formats such as R,G,B,X
	321	* (one extra byte per pixel) by changing RGB_PIXELSIZE. Note that changing
	322	* the offsets will also change the order in which colormap data is organized.
	323	* RESTRICTIONS:
	324	* 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
	325	* 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
	326	* useful if you are using JPEG color spaces other than YCbCr or grayscale.
	327	* 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
	328	* is not 3 (they don't understand about dummy color components!). So you
	329	* can't use color quantization if you change that value.
	330	*/
	331
	332	#define RGB_RED 0 /* Offset of Red in an RGB scanline element */
	333	#define RGB_GREEN 1 /* Offset of Green */
	334	#define RGB_BLUE 2 /* Offset of Blue */
	335	#define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */
	336
	337
	338	/* Definitions for speed-related optimizations. */
	339
	340
	341	/* If your compiler supports inline functions, define INLINE
	342	* as the inline keyword; otherwise define it as empty.
	343	*/
	344
	345	#ifndef INLINE
	346	#ifdef __GNUC__ /* for instance, GNU C knows about inline */
	347	#define INLINE __inline__
	348	#endif
	349	#ifndef INLINE
	350	#define INLINE /* default is to define it as empty */
	351	#endif
	352	#endif
	353
	354
	355	/* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
	356	* two 16-bit shorts is faster than multiplying two ints. Define MULTIPLIER
	357	* as short on such a machine. MULTIPLIER must be at least 16 bits wide.
	358	*/
	359
	360	#ifndef MULTIPLIER
	361	#define MULTIPLIER int /* type for fastest integer multiply */
	362	#endif
	363
	364
	365	/* FAST_FLOAT should be either float or double, whichever is done faster
	366	* by your compiler. (Note that this type is only used in the floating point
	367	* DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
	368	* Typically, float is faster in ANSI C compilers, while double is faster in
	369	* pre-ANSI compilers (because they insist on converting to double anyway).
	370	* The code below therefore chooses float if we have ANSI-style prototypes.
	371	*/
	372
	373	#ifndef FAST_FLOAT
	374	#ifdef HAVE_PROTOTYPES
	375	#define FAST_FLOAT float
	376	#else
	377	#define FAST_FLOAT double
	378	#endif
	379	#endif
	380
	381	#endif /* JPEG_INTERNAL_OPTIONS */