SAMV71 Xplained Ultra Software Package 1.4

jmorecfg.h

00001 /*
00002  * jmorecfg.h
00003  *
00004  * Copyright (C) 1991-1997, Thomas G. Lane.
00005  * Modified 1997-2009 by Guido Vollbeding.
00006  * This file is part of the Independent JPEG Group's software.
00007  * For conditions of distribution and use, see the accompanying README file.
00008  *
00009  * This file contains additional configuration options that customize the
00010  * JPEG software for special applications or support machine-dependent
00011  * optimizations.  Most users will not need to touch this file.
00012  */
00013 
00014 
00015 /*
00016  * Define BITS_IN_JSAMPLE as either
00017  *   8   for 8-bit sample values (the usual setting)
00018  *   12  for 12-bit sample values
00019  * Only 8 and 12 are legal data precisions for lossy JPEG according to the
00020  * JPEG standard, and the IJG code does not support anything else!
00021  * We do not support run-time selection of data precision, sorry.
00022  */
00023 
00024 #define BITS_IN_JSAMPLE  8  /* use 8 or 12 */
00025 
00026 
00027 /*
00028  * Maximum number of components (color channels) allowed in JPEG image.
00029  * To meet the letter of the JPEG spec, set this to 255.  However, darn
00030  * few applications need more than 4 channels (maybe 5 for CMYK + alpha
00031  * mask).  We recommend 10 as a reasonable compromise; use 4 if you are
00032  * really short on memory.  (Each allowed component costs a hundred or so
00033  * bytes of storage, whether actually used in an image or not.)
00034  */
00035 
00036 #define MAX_COMPONENTS  10  /* maximum number of image components */
00037 
00038 
00039 /*
00040  * Basic data types.
00041  * You may need to change these if you have a machine with unusual data
00042  * type sizes; for example, "char" not 8 bits, "short" not 16 bits,
00043  * or "long" not 32 bits.  We don't care whether "int" is 16 or 32 bits,
00044  * but it had better be at least 16.
00045  */
00046 
00047 /* Representation of a single sample (pixel element value).
00048  * We frequently allocate large arrays of these, so it's important to keep
00049  * them small.  But if you have memory to burn and access to char or short
00050  * arrays is very slow on your hardware, you might want to change these.
00051  */
00052 
00053 #if BITS_IN_JSAMPLE == 8
00054 /* JSAMPLE should be the smallest type that will hold the values 0..255.
00055  * You can use a signed char by having GETJSAMPLE mask it with 0xFF.
00056  */
00057 
00058 #ifdef HAVE_UNSIGNED_CHAR
00059 
00060 typedef unsigned char JSAMPLE;
00061 #define GETJSAMPLE(value)  ((int) (value))
00062 
00063 #else /* not HAVE_UNSIGNED_CHAR */
00064 
00065 typedef char JSAMPLE;
00066 #ifdef CHAR_IS_UNSIGNED
00067 #define GETJSAMPLE(value)  ((int) (value))
00068 #else
00069 #define GETJSAMPLE(value)  ((int) (value) & 0xFF)
00070 #endif /* CHAR_IS_UNSIGNED */
00071 
00072 #endif /* HAVE_UNSIGNED_CHAR */
00073 
00074 #define MAXJSAMPLE  255
00075 #define CENTERJSAMPLE   128
00076 
00077 #endif /* BITS_IN_JSAMPLE == 8 */
00078 
00079 
00080 #if BITS_IN_JSAMPLE == 12
00081 /* JSAMPLE should be the smallest type that will hold the values 0..4095.
00082  * On nearly all machines "short" will do nicely.
00083  */
00084 
00085 typedef short JSAMPLE;
00086 #define GETJSAMPLE(value)  ((int) (value))
00087 
00088 #define MAXJSAMPLE  4095
00089 #define CENTERJSAMPLE   2048
00090 
00091 #endif /* BITS_IN_JSAMPLE == 12 */
00092 
00093 
00094 /* Representation of a DCT frequency coefficient.
00095  * This should be a signed value of at least 16 bits; "short" is usually OK.
00096  * Again, we allocate large arrays of these, but you can change to int
00097  * if you have memory to burn and "short" is really slow.
00098  */
00099 
00100 typedef short JCOEF;
00101 
00102 
00103 /* Compressed datastreams are represented as arrays of JOCTET.
00104  * These must be EXACTLY 8 bits wide, at least once they are written to
00105  * external storage.  Note that when using the stdio data source/destination
00106  * managers, this is also the data type passed to fread/fwrite.
00107  */
00108 
00109 #ifdef HAVE_UNSIGNED_CHAR
00110 
00111 typedef unsigned char JOCTET;
00112 #define GETJOCTET(value)  (value)
00113 
00114 #else /* not HAVE_UNSIGNED_CHAR */
00115 
00116 typedef char JOCTET;
00117 #ifdef CHAR_IS_UNSIGNED
00118 #define GETJOCTET(value)  (value)
00119 #else
00120 #define GETJOCTET(value)  ((value) & 0xFF)
00121 #endif /* CHAR_IS_UNSIGNED */
00122 
00123 #endif /* HAVE_UNSIGNED_CHAR */
00124 
00125 
00126 /* These typedefs are used for various table entries and so forth.
00127  * They must be at least as wide as specified; but making them too big
00128  * won't cost a huge amount of memory, so we don't provide special
00129  * extraction code like we did for JSAMPLE.  (In other words, these
00130  * typedefs live at a different point on the speed/space tradeoff curve.)
00131  */
00132 
00133 /* UINT8 must hold at least the values 0..255. */
00134 
00135 #ifdef HAVE_UNSIGNED_CHAR
00136 typedef unsigned char UINT8;
00137 #else /* not HAVE_UNSIGNED_CHAR */
00138 #ifdef CHAR_IS_UNSIGNED
00139 typedef char UINT8;
00140 #else /* not CHAR_IS_UNSIGNED */
00141 typedef short UINT8;
00142 #endif /* CHAR_IS_UNSIGNED */
00143 #endif /* HAVE_UNSIGNED_CHAR */
00144 
00145 /* UINT16 must hold at least the values 0..65535. */
00146 
00147 #ifdef HAVE_UNSIGNED_SHORT
00148 typedef unsigned short UINT16;
00149 #else /* not HAVE_UNSIGNED_SHORT */
00150 typedef unsigned int UINT16;
00151 #endif /* HAVE_UNSIGNED_SHORT */
00152 
00153 /* INT16 must hold at least the values -32768..32767. */
00154 
00155 #ifndef XMD_H           /* X11/xmd.h correctly defines INT16 */
00156 typedef short INT16;
00157 #endif
00158 
00159 /* INT32 must hold at least signed 32-bit values. */
00160 
00161 #ifndef XMD_H           /* X11/xmd.h correctly defines INT32 */
00162 #ifndef _BASETSD_H_     /* Microsoft defines it in basetsd.h */
00163 #ifndef _BASETSD_H      /* MinGW is slightly different */
00164 #ifndef QGLOBAL_H       /* Qt defines it in qglobal.h */
00165 typedef long INT32;
00166 #endif
00167 #endif
00168 #endif
00169 #endif
00170 
00171 /* Datatype used for image dimensions.  The JPEG standard only supports
00172  * images up to 64K*64K due to 16-bit fields in SOF markers.  Therefore
00173  * "unsigned int" is sufficient on all machines.  However, if you need to
00174  * handle larger images and you don't mind deviating from the spec, you
00175  * can change this datatype.
00176  */
00177 
00178 typedef unsigned int JDIMENSION;
00179 
00180 #define JPEG_MAX_DIMENSION  65500L  /* a tad under 64K to prevent overflows */
00181 
00182 
00183 /* These macros are used in all function definitions and extern declarations.
00184  * You could modify them if you need to change function linkage conventions;
00185  * in particular, you'll need to do that to make the library a Windows DLL.
00186  * Another application is to make all functions global for use with debuggers
00187  * or code profilers that require it.
00188  */
00189 
00190 /* a function called through method pointers: */
00191 #define METHODDEF(type)     static type
00192 /* a function used only in its module: */
00193 #define LOCAL(type)     static type
00194 /* a function referenced thru EXTERNs: */
00195 #define GLOBAL(type)        type
00196 /* a reference to a GLOBAL function: */
00197 #define EXTERN(type)        extern type
00198 
00199 
00200 /* This macro is used to declare a "method", that is, a function pointer.
00201  * We want to supply prototype parameters if the compiler can cope.
00202  * Note that the arglist parameter must be parenthesized!
00203  * Again, you can customize this if you need special linkage keywords.
00204  */
00205 
00206 #ifdef HAVE_PROTOTYPES
00207 #define JMETHOD(type,methodname,arglist)  type (*methodname) arglist
00208 #else
00209 #define JMETHOD(type,methodname,arglist)  type (*methodname) ()
00210 #endif
00211 
00212 
00213 /* Here is the pseudo-keyword for declaring pointers that must be "far"
00214  * on 80x86 machines.  Most of the specialized coding for 80x86 is handled
00215  * by just saying "FAR *" where such a pointer is needed.  In a few places
00216  * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
00217  */
00218 
00219 #ifndef FAR
00220 #ifdef NEED_FAR_POINTERS
00221 #define FAR  far
00222 #else
00223 #define FAR
00224 #endif
00225 #endif
00226 
00227 
00228 /*
00229  * On a few systems, type boolean and/or its values FALSE, TRUE may appear
00230  * in standard header files.  Or you may have conflicts with application-
00231  * specific header files that you want to include together with these files.
00232  * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
00233  */
00234 
00235 #ifndef HAVE_BOOLEAN
00236 typedef int boolean;
00237 #endif
00238 #ifndef FALSE           /* in case these macros already exist */
00239 #define FALSE   0       /* values of boolean */
00240 #endif
00241 #ifndef TRUE
00242 #define TRUE    1
00243 #endif
00244 
00245 
00246 /*
00247  * The remaining options affect code selection within the JPEG library,
00248  * but they don't need to be visible to most applications using the library.
00249  * To minimize application namespace pollution, the symbols won't be
00250  * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
00251  */
00252 
00253 #ifdef JPEG_INTERNALS
00254 #define JPEG_INTERNAL_OPTIONS
00255 #endif
00256 
00257 #ifdef JPEG_INTERNAL_OPTIONS
00258 
00259 
00260 /*
00261  * These defines indicate whether to include various optional functions.
00262  * Undefining some of these symbols will produce a smaller but less capable
00263  * library.  Note that you can leave certain source files out of the
00264  * compilation/linking process if you've #undef'd the corresponding symbols.
00265  * (You may HAVE to do that if your compiler doesn't like null source files.)
00266  */
00267 
00268 /* Capability options common to encoder and decoder: */
00269 
00270 #define DCT_ISLOW_SUPPORTED /* slow but accurate integer algorithm */
00271 #define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */
00272 #undef DCT_FLOAT_SUPPORTED  /* floating-point: accurate, fast on fast HW */
00273 
00274 /* Encoder capability options: */
00275 
00276 #define C_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */
00277 #undef C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
00278 #undef C_PROGRESSIVE_SUPPORTED      /* Progressive JPEG? (Requires MULTISCAN)*/
00279 #undef DCT_SCALING_SUPPORTED        /* Input rescaling via DCT? (Requires DCT_ISLOW)*/
00280 #undef ENTROPY_OPT_SUPPORTED        /* Optimization of entropy coding parms? */
00281 /* Note: if you selected 12-bit data precision, it is dangerous to turn off
00282  * ENTROPY_OPT_SUPPORTED.  The standard Huffman tables are only good for 8-bit
00283  * precision, so jchuff.c normally uses entropy optimization to compute
00284  * usable tables for higher precision.  If you don't want to do optimization,
00285  * you'll have to supply different default Huffman tables.
00286  * The exact same statements apply for progressive JPEG: the default tables
00287  * don't work for progressive mode.  (This may get fixed, however.)
00288  */
00289 #define INPUT_SMOOTHING_SUPPORTED   /* Input image smoothing option? */
00290 
00291 /* Decoder capability options: */
00292 
00293 #define D_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */
00294 #undef D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
00295 #undef D_PROGRESSIVE_SUPPORTED      /* Progressive JPEG? (Requires MULTISCAN)*/
00296 #undef IDCT_SCALING_SUPPORTED       /* Output rescaling via IDCT? */
00297 #undef SAVE_MARKERS_SUPPORTED       /* jpeg_save_markers() needed? */
00298 #undef BLOCK_SMOOTHING_SUPPORTED   /* Block smoothing? (Progressive only) */
00299 #undef  UPSAMPLE_SCALING_SUPPORTED  /* Output rescaling at upsample stage? */
00300 #define UPSAMPLE_MERGING_SUPPORTED  /* Fast path for sloppy upsampling? */
00301 #define QUANT_1PASS_SUPPORTED       /* 1-pass color quantization? */
00302 #define QUANT_2PASS_SUPPORTED       /* 2-pass color quantization? */
00303 
00304 /* more capability options later, no doubt */
00305 
00306 
00307 /*
00308  * Ordering of RGB data in scanlines passed to or from the application.
00309  * If your application wants to deal with data in the order B,G,R, just
00310  * change these macros.  You can also deal with formats such as R,G,B,X
00311  * (one extra byte per pixel) by changing RGB_PIXELSIZE.  Note that changing
00312  * the offsets will also change the order in which colormap data is organized.
00313  * RESTRICTIONS:
00314  * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
00315  * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
00316  *    useful if you are using JPEG color spaces other than YCbCr or grayscale.
00317  * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
00318  *    is not 3 (they don't understand about dummy color components!).  So you
00319  *    can't use color quantization if you change that value.
00320  */
00321 
00322 #define RGB_RED         0   /* Offset of Red in an RGB scanline element */
00323 #define RGB_GREEN       1   /* Offset of Green */
00324 #define RGB_BLUE        2   /* Offset of Blue */
00325 #define RGB_PIXELSIZE   3   /* JSAMPLEs per RGB scanline element */
00326 
00327 
00328 /* Definitions for speed-related optimizations. */
00329 
00330 
00331 /* If your compiler supports inline functions, define INLINE
00332  * as the inline keyword; otherwise define it as empty.
00333  */
00334 
00335 #ifndef INLINE
00336 #  ifdef __GNUC__           /* for instance, GNU C knows about inline */
00337 #    define INLINE __inline__
00338 #  endif
00339 #  ifdef __ICCARM__         /* for instance, GNU C knows about inline */
00340 #    define INLINE inline
00341 #  endif
00342 #  ifndef INLINE
00343 #    define INLINE          /* default is to define it as empty */
00344 #  endif
00345 #endif
00346 
00347 
00348 /* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
00349  * two 16-bit shorts is faster than multiplying two ints.  Define MULTIPLIER
00350  * as short on such a machine.  MULTIPLIER must be at least 16 bits wide.
00351  */
00352 
00353 #ifndef MULTIPLIER
00354 #define MULTIPLIER  int     /* type for fastest integer multiply */
00355 #endif
00356 
00357 
00358 /* FAST_FLOAT should be either float or double, whichever is done faster
00359  * by your compiler.  (Note that this type is only used in the floating point
00360  * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
00361  * Typically, float is faster in ANSI C compilers, while double is faster in
00362  * pre-ANSI compilers (because they insist on converting to double anyway).
00363  * The code below therefore chooses float if we have ANSI-style prototypes.
00364  */
00365 
00366 #ifndef FAST_FLOAT
00367 #ifdef HAVE_PROTOTYPES
00368 #define FAST_FLOAT  float
00369 #else
00370 #define FAST_FLOAT  double
00371 #endif
00372 #endif
00373 
00374 #endif /* JPEG_INTERNAL_OPTIONS */
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