rosapps/lib/libjpeg/jmorecfg.h

   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 #ifdef _MSC_VER
  15 #pragma warning (disable : 4142)        /* benign redefinition of type */
  16 #endif
  17
  18 /*
  19  * Define BITS_IN_JSAMPLE as either
  20  *   8   for 8-bit sample values (the usual setting)
  21  *   12  for 12-bit sample values
  22  * Only 8 and 12 are legal data precisions for lossy JPEG according to the
  23  * JPEG standard, and the IJG code does not support anything else!
  24  * We do not support run-time selection of data precision, sorry.
  25  */
  26
  27 #define BITS_IN_JSAMPLE  8      /* use 8 or 12 */
  28
  29
  30 /*
  31  * Maximum number of components (color channels) allowed in JPEG image.
  32  * To meet the letter of the JPEG spec, set this to 255.  However, darn
  33  * few applications need more than 4 channels (maybe 5 for CMYK + alpha
  34  * mask).  We recommend 10 as a reasonable compromise; use 4 if you are
  35  * really short on memory.  (Each allowed component costs a hundred or so
  36  * bytes of storage, whether actually used in an image or not.)
  37  */
  38
  39 #define MAX_COMPONENTS  10      /* maximum number of image components */
  40
  41
  42 /*
  43  * Basic data types.
  44  * You may need to change these if you have a machine with unusual data
  45  * type sizes; for example, "char" not 8 bits, "short" not 16 bits,
  46  * or "long" not 32 bits.  We don't care whether "int" is 16 or 32 bits,
  47  * but it had better be at least 16.
  48  */
  49
  50 /* Representation of a single sample (pixel element value).
  51  * We frequently allocate large arrays of these, so it's important to keep
  52  * them small.  But if you have memory to burn and access to char or short
  53  * arrays is very slow on your hardware, you might want to change these.
  54  */
  55
  56 #if BITS_IN_JSAMPLE == 8
  57 /* JSAMPLE should be the smallest type that will hold the values 0..255.
  58  * You can use a signed char by having GETJSAMPLE mask it with 0xFF.
  59  */
  60
  61 #ifdef HAVE_UNSIGNED_CHAR
  62
  63 typedef unsigned char JSAMPLE;
  64 #define GETJSAMPLE(value)  ((int) (value))
  65
  66 #else /* not HAVE_UNSIGNED_CHAR */
  67
  68 typedef char JSAMPLE;
  69 #ifdef CHAR_IS_UNSIGNED
  70 #define GETJSAMPLE(value)  ((int) (value))
  71 #else
  72 #define GETJSAMPLE(value)  ((int) (value) & 0xFF)
  73 #endif /* CHAR_IS_UNSIGNED */
  74
  75 #endif /* HAVE_UNSIGNED_CHAR */
  76
  77 #define MAXJSAMPLE      255
  78 #define CENTERJSAMPLE   128
  79
  80 #endif /* BITS_IN_JSAMPLE == 8 */
  81
  82
  83 #if BITS_IN_JSAMPLE == 12
  84 /* JSAMPLE should be the smallest type that will hold the values 0..4095.
  85  * On nearly all machines "short" will do nicely.
  86  */
  87
  88 typedef short JSAMPLE;
  89 #define GETJSAMPLE(value)  ((int) (value))
  90
  91 #define MAXJSAMPLE      4095
  92 #define CENTERJSAMPLE   2048
  93
  94 #endif /* BITS_IN_JSAMPLE == 12 */
  95
  96
  97 /* Representation of a DCT frequency coefficient.
  98  * This should be a signed value of at least 16 bits; "short" is usually OK.
  99  * Again, we allocate large arrays of these, but you can change to int
 100  * if you have memory to burn and "short" is really slow.
 101  */
 102
 103 typedef short JCOEF;
 104
 105 /* Defines for MMX/SSE2 support.  */
 106 /* Disabled for AT&T and VC++ 6.0 */
 107 #if defined(_M_IX86) && !defined(__GNUC__)      && !(defined(_MSC_VER) && (_MSC_VER<1300))
 108 #define HAVE_MMX_INTEL_MNEMONICS
 109
 110 /* SSE2 code appears broken for some cpus (bug 247437)
 111         my comment: I read the discussion about that bug and it was disabled
 112         because one guy sent a bugreport - incorrectly decoded jpeg.
 113         No one else seems to have this problem = probably a hardware problem.
 114         (He had a P4 Celeron)
 115         PS: This code comes from Mozilla/Firefox.                       -= BiShop =-
 116 */
 117 #define HAVE_SSE2_INTEL_MNEMONICS
 118 #endif
 119
 120
 121 /* Compressed datastreams are represented as arrays of JOCTET.
 122  * These must be EXACTLY 8 bits wide, at least once they are written to
 123  * external storage.  Note that when using the stdio data source/destination
 124  * managers, this is also the data type passed to fread/fwrite.
 125  */
 126
 127 #ifdef HAVE_UNSIGNED_CHAR
 128
 129 typedef unsigned char JOCTET;
 130 #define GETJOCTET(value)  (value)
 131
 132 #else /* not HAVE_UNSIGNED_CHAR */
 133
 134 typedef char JOCTET;
 135 #ifdef CHAR_IS_UNSIGNED
 136 #define GETJOCTET(value)  (value)
 137 #else
 138 #define GETJOCTET(value)  ((value) & 0xFF)
 139 #endif /* CHAR_IS_UNSIGNED */
 140
 141 #endif /* HAVE_UNSIGNED_CHAR */
 142
 143
 144 /* These typedefs are used for various table entries and so forth.
 145  * They must be at least as wide as specified; but making them too big
 146  * won't cost a huge amount of memory, so we don't provide special
 147  * extraction code like we did for JSAMPLE.  (In other words, these
 148  * typedefs live at a different point on the speed/space tradeoff curve.)
 149  */
 150
 151 /* UINT8 must hold at least the values 0..255. */
 152
 153 #ifdef HAVE_UNSIGNED_CHAR
 154 typedef unsigned char UINT8;
 155 #else /* not HAVE_UNSIGNED_CHAR */
 156 #ifdef CHAR_IS_UNSIGNED
 157 typedef char UINT8;
 158 #else /* not CHAR_IS_UNSIGNED */
 159 typedef short UINT8;
 160 #endif /* CHAR_IS_UNSIGNED */
 161 #endif /* HAVE_UNSIGNED_CHAR */
 162
 163 /* UINT16 must hold at least the values 0..65535. */
 164
 165 #ifdef HAVE_UNSIGNED_SHORT
 166 typedef unsigned short UINT16;
 167 #else /* not HAVE_UNSIGNED_SHORT */
 168 typedef unsigned int UINT16;
 169 #endif /* HAVE_UNSIGNED_SHORT */
 170
 171 /* INT16 must hold at least the values -32768..32767. */
 172
 173 #ifndef XMD_H                   /* X11/xmd.h correctly defines INT16 */
 174 typedef short INT16;
 175 #endif
 176
 177 /* INT32 must hold at least signed 32-bit values. */
 178
 179 #ifndef XMD_H                   /* X11/xmd.h correctly defines INT32 */
 180 /* typedef long INT32; */
 181 #endif
 182
 183 /* Datatype used for image dimensions.  The JPEG standard only supports
 184  * images up to 64K*64K due to 16-bit fields in SOF markers.  Therefore
 185  * "unsigned int" is sufficient on all machines.  However, if you need to
 186  * handle larger images and you don't mind deviating from the spec, you
 187  * can change this datatype.
 188  */
 189
 190 typedef unsigned int JDIMENSION;
 191
 192 #define JPEG_MAX_DIMENSION  65500L  /* a tad under 64K to prevent overflows */
 193
 194
 195 /* These macros are used in all function definitions and extern declarations.
 196  * You could modify them if you need to change function linkage conventions;
 197  * in particular, you'll need to do that to make the library a Windows DLL.
 198  * Another application is to make all functions global for use with debuggers
 199  * or code profilers that require it.
 200  */
 201
 202 /* a function called through method pointers: */
 203 #define METHODDEF(type)         static type
 204 /* a function used only in its module: */
 205 #define LOCAL(type)             static type
 206 /* a function referenced thru EXTERNs: */
 207 #define GLOBAL(type)            type
 208 /* a reference to a GLOBAL function: */
 209 #define EXTERN(type)            extern type
 210
 211
 212 /* This macro is used to declare a "method", that is, a function pointer.
 213  * We want to supply prototype parameters if the compiler can cope.
 214  * Note that the arglist parameter must be parenthesized!
 215  * Again, you can customize this if you need special linkage keywords.
 216  */
 217
 218 #ifdef HAVE_PROTOTYPES
 219 #define JMETHOD(type,methodname,arglist)  type (*methodname) arglist
 220 #else
 221 #define JMETHOD(type,methodname,arglist)  type (*methodname) ()
 222 #endif
 223
 224
 225 /* Here is the pseudo-keyword for declaring pointers that must be "far"
 226  * on 80x86 machines.  Most of the specialized coding for 80x86 is handled
 227  * by just saying "FAR *" where such a pointer is needed.  In a few places
 228  * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
 229  */
 230
 231 #ifdef NEED_FAR_POINTERS
 232 #define FAR  far
 233 #else
 234 #define FAR
 235 #endif
 236
 237
 238 /*
 239  * On a few systems, type boolean and/or its values FALSE, TRUE may appear
 240  * in standard header files.  Or you may have conflicts with application-
 241  * specific header files that you want to include together with these files.
 242  * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
 243  */
 244
 245 #ifndef HAVE_BOOLEAN
 246 typedef int boolean;
 247 #endif
 248 #ifndef FALSE                   /* in case these macros already exist */
 249 #define FALSE   0               /* values of boolean */
 250 #endif
 251 #ifndef TRUE
 252 #define TRUE    1
 253 #endif
 254
 255
 256 /*
 257  * The remaining options affect code selection within the JPEG library,
 258  * but they don't need to be visible to most applications using the library.
 259  * To minimize application namespace pollution, the symbols won't be
 260  * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
 261  */
 262
 263 #ifdef JPEG_INTERNALS
 264 #define JPEG_INTERNAL_OPTIONS
 265 #endif
 266
 267 #ifdef JPEG_INTERNAL_OPTIONS
 268
 269
 270 /*
 271  * These defines indicate whether to include various optional functions.
 272  * Undefining some of these symbols will produce a smaller but less capable
 273  * library.  Note that you can leave certain source files out of the
 274  * compilation/linking process if you've #undef'd the corresponding symbols.
 275  * (You may HAVE to do that if your compiler doesn't like null source files.)
 276  */
 277
 278 /* Arithmetic coding is unsupported for legal reasons.  Complaints to IBM. */
 279
 280 /* Capability options common to encoder and decoder: */
 281
 282 #define DCT_ISLOW_SUPPORTED     /* slow but accurate integer algorithm */
 283 #define DCT_IFAST_SUPPORTED     /* faster, less accurate integer method */
 284 #undef DCT_FLOAT_SUPPORTED      /* floating-point: accurate, fast on fast HW */
 285
 286 /* Encoder capability options: */
 287
 288 #undef  C_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */
 289 #define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
 290 #define C_PROGRESSIVE_SUPPORTED     /* Progressive JPEG? (Requires MULTISCAN)*/
 291 #define ENTROPY_OPT_SUPPORTED       /* Optimization of entropy coding parms? */
 292 /* Note: if you selected 12-bit data precision, it is dangerous to turn off
 293  * ENTROPY_OPT_SUPPORTED.  The standard Huffman tables are only good for 8-bit
 294  * precision, so jchuff.c normally uses entropy optimization to compute
 295  * usable tables for higher precision.  If you don't want to do optimization,
 296  * you'll have to supply different default Huffman tables.
 297  * The exact same statements apply for progressive JPEG: the default tables
 298  * don't work for progressive mode.  (This may get fixed, however.)
 299  */
 300 #define INPUT_SMOOTHING_SUPPORTED   /* Input image smoothing option? */
 301
 302 /* Decoder capability options: */
 303
 304 #undef  D_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */
 305 #define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
 306 #define D_PROGRESSIVE_SUPPORTED     /* Progressive JPEG? (Requires MULTISCAN)*/
 307 #define SAVE_MARKERS_SUPPORTED      /* jpeg_save_markers() needed? */
 308 #define BLOCK_SMOOTHING_SUPPORTED   /* Block smoothing? (Progressive only) */
 309 #undef IDCT_SCALING_SUPPORTED       /* Output rescaling via IDCT? */
 310 #undef UPSAMPLE_SCALING_SUPPORTED  /* Output rescaling at upsample stage? */
 311 #define UPSAMPLE_MERGING_SUPPORTED  /* Fast path for sloppy upsampling? */
 312 #undef QUANT_1PASS_SUPPORTED        /* 1-pass color quantization? */
 313 #undef QUANT_2PASS_SUPPORTED        /* 2-pass color quantization? */
 314
 315 /* more capability options later, no doubt */
 316
 317
 318 /*
 319  * Ordering of RGB data in scanlines passed to or from the application.
 320  * If your application wants to deal with data in the order B,G,R, just
 321  * change these macros.  You can also deal with formats such as R,G,B,X
 322  * (one extra byte per pixel) by changing RGB_PIXELSIZE.  Note that changing
 323  * the offsets will also change the order in which colormap data is organized.
 324  * RESTRICTIONS:
 325  * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
 326  * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
 327  *    useful if you are using JPEG color spaces other than YCbCr or grayscale.
 328  * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
 329  *    is not 3 (they don't understand about dummy color components!).  So you
 330  *    can't use color quantization if you change that value.
 331  */
 332
 333 #define RGB_RED         0       /* Offset of Red in an RGB scanline element */
 334 #define RGB_GREEN       1       /* Offset of Green */
 335 #define RGB_BLUE        2       /* Offset of Blue */
 336 #define RGB_PIXELSIZE   3       /* JSAMPLEs per RGB scanline element */
 337
 338
 339 /* Definitions for speed-related optimizations. */
 340
 341
 342 /* If your compiler supports inline functions, define INLINE
 343  * as the inline keyword; otherwise define it as empty.
 344  */
 345
 346 #ifndef INLINE
 347 #ifdef __GNUC__                 /* for instance, GNU C knows about inline */
 348 #define INLINE __inline__
 349 #endif
 350 #ifndef INLINE
 351 #define INLINE                  /* default is to define it as empty */
 352 #endif
 353 #endif
 354
 355
 356 /* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
 357  * two 16-bit shorts is faster than multiplying two ints.  Define MULTIPLIER
 358  * as short on such a machine.  MULTIPLIER must be at least 16 bits wide.
 359  */
 360
 361 #define int16 short
 362
 363 #ifndef MULTIPLIER
 364 #define MULTIPLIER  int16               /* type for fastest integer multiply */
 365 #endif
 366
 367
 368 /* FAST_FLOAT should be either float or double, whichever is done faster
 369  * by your compiler.  (Note that this type is only used in the floating point
 370  * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
 371  * Typically, float is faster in ANSI C compilers, while double is faster in
 372  * pre-ANSI compilers (because they insist on converting to double anyway).
 373  * The code below therefore chooses float if we have ANSI-style prototypes.
 374  */
 375
 376 #ifndef FAST_FLOAT
 377 #ifdef HAVE_PROTOTYPES
 378 #define FAST_FLOAT  float
 379 #else
 380 #define FAST_FLOAT  double
 381 #endif
 382 #endif
 383
 384 #endif /* JPEG_INTERNAL_OPTIONS */