reactos/dll/3rdparty/libjpeg/jmorecfg.h

   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 #if (defined (_MSC_VER) && (_MSC_VER >= 800))
  27 #define HAVE_UNSIGNED_CHAR
  28 #define EXTERN(type)  extern type __cdecl
  29 #endif
  30
  31 /*
  32  * Maximum number of components (color channels) allowed in JPEG image.
  33  * To meet the letter of the JPEG spec, set this to 255.  However, darn
  34  * few applications need more than 4 channels (maybe 5 for CMYK + alpha
  35  * mask).  We recommend 10 as a reasonable compromise; use 4 if you are
  36  * really short on memory.  (Each allowed component costs a hundred or so
  37  * bytes of storage, whether actually used in an image or not.)
  38  */
  39
  40 #define MAX_COMPONENTS  10      /* maximum number of image components */
  41
  42
  43 /*
  44  * Basic data types.
  45  * You may need to change these if you have a machine with unusual data
  46  * type sizes; for example, "char" not 8 bits, "short" not 16 bits,
  47  * or "long" not 32 bits.  We don't care whether "int" is 16 or 32 bits,
  48  * but it had better be at least 16.
  49  */
  50
  51 /* Representation of a single sample (pixel element value).
  52  * We frequently allocate large arrays of these, so it's important to keep
  53  * them small.  But if you have memory to burn and access to char or short
  54  * arrays is very slow on your hardware, you might want to change these.
  55  */
  56
  57 #if BITS_IN_JSAMPLE == 8
  58 /* JSAMPLE should be the smallest type that will hold the values 0..255.
  59  * You can use a signed char by having GETJSAMPLE mask it with 0xFF.
  60  */
  61
  62 #ifdef HAVE_UNSIGNED_CHAR
  63
  64 typedef unsigned char JSAMPLE;
  65 #define GETJSAMPLE(value)  ((int) (value))
  66
  67 #else /* not HAVE_UNSIGNED_CHAR */
  68
  69 typedef char JSAMPLE;
  70 #ifdef CHAR_IS_UNSIGNED
  71 #define GETJSAMPLE(value)  ((int) (value))
  72 #else
  73 #define GETJSAMPLE(value)  ((int) (value) & 0xFF)
  74 #endif /* CHAR_IS_UNSIGNED */
  75
  76 #endif /* HAVE_UNSIGNED_CHAR */
  77
  78 #define MAXJSAMPLE      255
  79 #define CENTERJSAMPLE   128
  80
  81 #endif /* BITS_IN_JSAMPLE == 8 */
  82
  83
  84 #if BITS_IN_JSAMPLE == 12
  85 /* JSAMPLE should be the smallest type that will hold the values 0..4095.
  86  * On nearly all machines "short" will do nicely.
  87  */
  88
  89 typedef short JSAMPLE;
  90 #define GETJSAMPLE(value)  ((int) (value))
  91
  92 #define MAXJSAMPLE      4095
  93 #define CENTERJSAMPLE   2048
  94
  95 #endif /* BITS_IN_JSAMPLE == 12 */
  96
  97
  98 /* Representation of a DCT frequency coefficient.
  99  * This should be a signed value of at least 16 bits; "short" is usually OK.
 100  * Again, we allocate large arrays of these, but you can change to int
 101  * if you have memory to burn and "short" is really slow.
 102  */
 103
 104 typedef short JCOEF;
 105
 106
 107 /* Compressed datastreams are represented as arrays of JOCTET.
 108  * These must be EXACTLY 8 bits wide, at least once they are written to
 109  * external storage.  Note that when using the stdio data source/destination
 110  * managers, this is also the data type passed to fread/fwrite.
 111  */
 112
 113 #ifdef HAVE_UNSIGNED_CHAR
 114
 115 typedef unsigned char JOCTET;
 116 #define GETJOCTET(value)  (value)
 117
 118 #else /* not HAVE_UNSIGNED_CHAR */
 119
 120 typedef char JOCTET;
 121 #ifdef CHAR_IS_UNSIGNED
 122 #define GETJOCTET(value)  (value)
 123 #else
 124 #define GETJOCTET(value)  ((value) & 0xFF)
 125 #endif /* CHAR_IS_UNSIGNED */
 126
 127 #endif /* HAVE_UNSIGNED_CHAR */
 128
 129
 130 /* These typedefs are used for various table entries and so forth.
 131  * They must be at least as wide as specified; but making them too big
 132  * won't cost a huge amount of memory, so we don't provide special
 133  * extraction code like we did for JSAMPLE.  (In other words, these
 134  * typedefs live at a different point on the speed/space tradeoff curve.)
 135  */
 136
 137 /* UINT8 must hold at least the values 0..255. */
 138
 139 #ifdef HAVE_UNSIGNED_CHAR
 140 typedef unsigned char UINT8;
 141 #else /* not HAVE_UNSIGNED_CHAR */
 142 #ifdef CHAR_IS_UNSIGNED
 143 typedef char UINT8;
 144 #else /* not CHAR_IS_UNSIGNED */
 145 typedef short UINT8;
 146 #endif /* CHAR_IS_UNSIGNED */
 147 #endif /* HAVE_UNSIGNED_CHAR */
 148
 149 /* UINT16 must hold at least the values 0..65535. */
 150
 151 #ifdef HAVE_UNSIGNED_SHORT
 152 typedef unsigned short UINT16;
 153 #else /* not HAVE_UNSIGNED_SHORT */
 154 typedef unsigned int UINT16;
 155 #endif /* HAVE_UNSIGNED_SHORT */
 156
 157 /* INT16 must hold at least the values -32768..32767. */
 158
 159 #ifndef XMD_H                   /* X11/xmd.h correctly defines INT16 */
 160 typedef short INT16;
 161 #endif
 162
 163 /* INT32 must hold at least signed 32-bit values. */
 164
 165 #ifndef XMD_H                   /* X11/xmd.h correctly defines INT32 */
 166 #ifndef _BASETSD_H_             /* Microsoft defines it in basetsd.h */
 167 #ifndef _BASETSD_H              /* MinGW is slightly different */
 168 #ifndef QGLOBAL_H               /* Qt defines it in qglobal.h */
 169 typedef long INT32;
 170 #endif
 171 #endif
 172 #endif
 173 #endif
 174
 175 /* Datatype used for image dimensions.  The JPEG standard only supports
 176  * images up to 64K*64K due to 16-bit fields in SOF markers.  Therefore
 177  * "unsigned int" is sufficient on all machines.  However, if you need to
 178  * handle larger images and you don't mind deviating from the spec, you
 179  * can change this datatype.
 180  */
 181
 182 typedef unsigned int JDIMENSION;
 183
 184 #define JPEG_MAX_DIMENSION  65500L  /* a tad under 64K to prevent overflows */
 185
 186
 187 /* These macros are used in all function definitions and extern declarations.
 188  * You could modify them if you need to change function linkage conventions;
 189  * in particular, you'll need to do that to make the library a Windows DLL.
 190  * Another application is to make all functions global for use with debuggers
 191  * or code profilers that require it.
 192  */
 193
 194 /* a function called through method pointers: */
 195 #define METHODDEF(type)         static type
 196 /* a function used only in its module: */
 197 #define LOCAL(type)             static type
 198 /* a function referenced thru EXTERNs: */
 199 #define GLOBAL(type)            type
 200 /* a reference to a GLOBAL function: */
 201 #define EXTERN(type)            extern type
 202
 203
 204 /* This macro is used to declare a "method", that is, a function pointer.
 205  * We want to supply prototype parameters if the compiler can cope.
 206  * Note that the arglist parameter must be parenthesized!
 207  * Again, you can customize this if you need special linkage keywords.
 208  */
 209
 210 #ifdef HAVE_PROTOTYPES
 211 #define JMETHOD(type,methodname,arglist)  type (*methodname) arglist
 212 #else
 213 #define JMETHOD(type,methodname,arglist)  type (*methodname) ()
 214 #endif
 215
 216
 217 /* Here is the pseudo-keyword for declaring pointers that must be "far"
 218  * on 80x86 machines.  Most of the specialized coding for 80x86 is handled
 219  * by just saying "FAR *" where such a pointer is needed.  In a few places
 220  * explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.
 221  */
 222
 223 #ifndef FAR
 224 #ifdef NEED_FAR_POINTERS
 225 #define FAR  far
 226 #else
 227 #define FAR
 228 #endif
 229 #endif
 230
 231
 232 /*
 233  * On a few systems, type boolean and/or its values FALSE, TRUE may appear
 234  * in standard header files.  Or you may have conflicts with application-
 235  * specific header files that you want to include together with these files.
 236  * Defining HAVE_BOOLEAN before including jpeglib.h should make it work.
 237  */
 238
 239 #ifndef HAVE_BOOLEAN
 240 typedef int boolean;
 241 #endif
 242 #ifndef FALSE                   /* in case these macros already exist */
 243 #define FALSE   0               /* values of boolean */
 244 #endif
 245 #ifndef TRUE
 246 #define TRUE    1
 247 #endif
 248
 249
 250 /*
 251  * The remaining options affect code selection within the JPEG library,
 252  * but they don't need to be visible to most applications using the library.
 253  * To minimize application namespace pollution, the symbols won't be
 254  * defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.
 255  */
 256
 257 #ifdef JPEG_INTERNALS
 258 #define JPEG_INTERNAL_OPTIONS
 259 #endif
 260
 261 #ifdef JPEG_INTERNAL_OPTIONS
 262
 263
 264 /*
 265  * These defines indicate whether to include various optional functions.
 266  * Undefining some of these symbols will produce a smaller but less capable
 267  * library.  Note that you can leave certain source files out of the
 268  * compilation/linking process if you've #undef'd the corresponding symbols.
 269  * (You may HAVE to do that if your compiler doesn't like null source files.)
 270  */
 271
 272 /* Capability options common to encoder and decoder: */
 273
 274 #define DCT_ISLOW_SUPPORTED     /* slow but accurate integer algorithm */
 275 #define DCT_IFAST_SUPPORTED     /* faster, less accurate integer method */
 276 #define DCT_FLOAT_SUPPORTED     /* floating-point: accurate, fast on fast HW */
 277
 278 /* Encoder capability options: */
 279
 280 #define C_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */
 281 #define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
 282 #define C_PROGRESSIVE_SUPPORTED     /* Progressive JPEG? (Requires MULTISCAN)*/
 283 #define DCT_SCALING_SUPPORTED       /* Input rescaling via DCT? (Requires DCT_ISLOW)*/
 284 #define ENTROPY_OPT_SUPPORTED       /* Optimization of entropy coding parms? */
 285 /* Note: if you selected 12-bit data precision, it is dangerous to turn off
 286  * ENTROPY_OPT_SUPPORTED.  The standard Huffman tables are only good for 8-bit
 287  * precision, so jchuff.c normally uses entropy optimization to compute
 288  * usable tables for higher precision.  If you don't want to do optimization,
 289  * you'll have to supply different default Huffman tables.
 290  * The exact same statements apply for progressive JPEG: the default tables
 291  * don't work for progressive mode.  (This may get fixed, however.)
 292  */
 293 #define INPUT_SMOOTHING_SUPPORTED   /* Input image smoothing option? */
 294
 295 /* Decoder capability options: */
 296
 297 #define D_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */
 298 #define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
 299 #define D_PROGRESSIVE_SUPPORTED     /* Progressive JPEG? (Requires MULTISCAN)*/
 300 #define IDCT_SCALING_SUPPORTED      /* Output rescaling via IDCT? */
 301 #define SAVE_MARKERS_SUPPORTED      /* jpeg_save_markers() needed? */
 302 #define BLOCK_SMOOTHING_SUPPORTED   /* Block smoothing? (Progressive only) */
 303 #undef  UPSAMPLE_SCALING_SUPPORTED  /* Output rescaling at upsample stage? */
 304 #define UPSAMPLE_MERGING_SUPPORTED  /* Fast path for sloppy upsampling? */
 305 #define QUANT_1PASS_SUPPORTED       /* 1-pass color quantization? */
 306 #define QUANT_2PASS_SUPPORTED       /* 2-pass color quantization? */
 307
 308 /* more capability options later, no doubt */
 309
 310
 311 /*
 312  * Ordering of RGB data in scanlines passed to or from the application.
 313  * If your application wants to deal with data in the order B,G,R, just
 314  * change these macros.  You can also deal with formats such as R,G,B,X
 315  * (one extra byte per pixel) by changing RGB_PIXELSIZE.  Note that changing
 316  * the offsets will also change the order in which colormap data is organized.
 317  * RESTRICTIONS:
 318  * 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.
 319  * 2. These macros only affect RGB<=>YCbCr color conversion, so they are not
 320  *    useful if you are using JPEG color spaces other than YCbCr or grayscale.
 321  * 3. The color quantizer modules will not behave desirably if RGB_PIXELSIZE
 322  *    is not 3 (they don't understand about dummy color components!).  So you
 323  *    can't use color quantization if you change that value.
 324  */
 325
 326 #define RGB_RED         0       /* Offset of Red in an RGB scanline element */
 327 #define RGB_GREEN       1       /* Offset of Green */
 328 #define RGB_BLUE        2       /* Offset of Blue */
 329 #define RGB_PIXELSIZE   3       /* JSAMPLEs per RGB scanline element */
 330
 331
 332 /* Definitions for speed-related optimizations. */
 333
 334
 335 /* If your compiler supports inline functions, define INLINE
 336  * as the inline keyword; otherwise define it as empty.
 337  */
 338
 339 #ifndef INLINE
 340 #ifdef __GNUC__                 /* for instance, GNU C knows about inline */
 341 #define INLINE __inline__
 342 #endif
 343 #ifndef INLINE
 344 #define INLINE                  /* default is to define it as empty */
 345 #endif
 346 #endif
 347
 348
 349 /* On some machines (notably 68000 series) "int" is 32 bits, but multiplying
 350  * two 16-bit shorts is faster than multiplying two ints.  Define MULTIPLIER
 351  * as short on such a machine.  MULTIPLIER must be at least 16 bits wide.
 352  */
 353
 354 #ifndef MULTIPLIER
 355 #define MULTIPLIER  int         /* type for fastest integer multiply */
 356 #endif
 357
 358
 359 /* FAST_FLOAT should be either float or double, whichever is done faster
 360  * by your compiler.  (Note that this type is only used in the floating point
 361  * DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)
 362  * Typically, float is faster in ANSI C compilers, while double is faster in
 363  * pre-ANSI compilers (because they insist on converting to double anyway).
 364  * The code below therefore chooses float if we have ANSI-style prototypes.
 365  */
 366
 367 #ifndef FAST_FLOAT
 368 #ifdef HAVE_PROTOTYPES
 369 #define FAST_FLOAT  float
 370 #else
 371 #define FAST_FLOAT  double
 372 #endif
 373 #endif
 374
 375 #endif /* JPEG_INTERNAL_OPTIONS */