workbench/libs/jpeg/jdct.h

   1 /*
   2  * jdct.h
   3  *
   4  * Copyright (C) 1994-1996, 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 include file contains common declarations for the forward and
   9  * inverse DCT modules.  These declarations are private to the DCT managers
  10  * (jcdctmgr.c, jddctmgr.c) and the individual DCT algorithms.
  11  * The individual DCT algorithms are kept in separate files to ease
  12  * machine-dependent tuning (e.g., assembly coding).
  13  */
  14
  15
  16 /*
  17  * A forward DCT routine is given a pointer to an input sample array and
  18  * a pointer to a work area of type DCTELEM[]; the DCT is to be performed
  19  * in-place in that buffer.  Type DCTELEM is int for 8-bit samples, INT32
  20  * for 12-bit samples.  (NOTE: Floating-point DCT implementations use an
  21  * array of type FAST_FLOAT, instead.)
  22  * The input data is to be fetched from the sample array starting at a
  23  * specified column.  (Any row offset needed will be applied to the array
  24  * pointer before it is passed to the FDCT code.)
  25  * Note that the number of samples fetched by the FDCT routine is
  26  * DCT_h_scaled_size * DCT_v_scaled_size.
  27  * The DCT outputs are returned scaled up by a factor of 8; they therefore
  28  * have a range of +-8K for 8-bit data, +-128K for 12-bit data.  This
  29  * convention improves accuracy in integer implementations and saves some
  30  * work in floating-point ones.
  31  * Quantization of the output coefficients is done by jcdctmgr.c.
  32  */
  33
  34 #if BITS_IN_JSAMPLE == 8
  35 typedef int DCTELEM;            /* 16 or 32 bits is fine */
  36 #else
  37 typedef INT32 DCTELEM;          /* must have 32 bits */
  38 #endif
  39
  40 typedef JMETHOD(void, forward_DCT_method_ptr, (DCTELEM * data,
  41                                                JSAMPARRAY sample_data,
  42                                                JDIMENSION start_col));
  43 typedef JMETHOD(void, float_DCT_method_ptr, (FAST_FLOAT * data,
  44                                              JSAMPARRAY sample_data,
  45                                              JDIMENSION start_col));
  46
  47
  48 /*
  49  * An inverse DCT routine is given a pointer to the input JBLOCK and a pointer
  50  * to an output sample array.  The routine must dequantize the input data as
  51  * well as perform the IDCT; for dequantization, it uses the multiplier table
  52  * pointed to by compptr->dct_table.  The output data is to be placed into the
  53  * sample array starting at a specified column.  (Any row offset needed will
  54  * be applied to the array pointer before it is passed to the IDCT code.)
  55  * Note that the number of samples emitted by the IDCT routine is
  56  * DCT_h_scaled_size * DCT_v_scaled_size.
  57  */
  58
  59 /* typedef inverse_DCT_method_ptr is declared in jpegint.h */
  60
  61 /*
  62  * Each IDCT routine has its own ideas about the best dct_table element type.
  63  */
  64
  65 typedef MULTIPLIER ISLOW_MULT_TYPE; /* short or int, whichever is faster */
  66 #if BITS_IN_JSAMPLE == 8
  67 typedef MULTIPLIER IFAST_MULT_TYPE; /* 16 bits is OK, use short if faster */
  68 #define IFAST_SCALE_BITS  2     /* fractional bits in scale factors */
  69 #else
  70 typedef INT32 IFAST_MULT_TYPE;  /* need 32 bits for scaled quantizers */
  71 #define IFAST_SCALE_BITS  13    /* fractional bits in scale factors */
  72 #endif
  73 typedef FAST_FLOAT FLOAT_MULT_TYPE; /* preferred floating type */
  74
  75
  76 /*
  77  * Each IDCT routine is responsible for range-limiting its results and
  78  * converting them to unsigned form (0..MAXJSAMPLE).  The raw outputs could
  79  * be quite far out of range if the input data is corrupt, so a bulletproof
  80  * range-limiting step is required.  We use a mask-and-table-lookup method
  81  * to do the combined operations quickly.  See the comments with
  82  * prepare_range_limit_table (in jdmaster.c) for more info.
  83  */
  84
  85 #define IDCT_range_limit(cinfo)  ((cinfo)->sample_range_limit + CENTERJSAMPLE)
  86
  87 #define RANGE_MASK  (MAXJSAMPLE * 4 + 3) /* 2 bits wider than legal samples */
  88
  89
  90 /* Short forms of external names for systems with brain-damaged linkers. */
  91
  92 #ifdef NEED_SHORT_EXTERNAL_NAMES
  93 #define jpeg_fdct_islow         jFDislow
  94 #define jpeg_fdct_ifast         jFDifast
  95 #define jpeg_fdct_float         jFDfloat
  96 #define jpeg_fdct_7x7           jFD7x7
  97 #define jpeg_fdct_6x6           jFD6x6
  98 #define jpeg_fdct_5x5           jFD5x5
  99 #define jpeg_fdct_4x4           jFD4x4
 100 #define jpeg_fdct_3x3           jFD3x3
 101 #define jpeg_fdct_2x2           jFD2x2
 102 #define jpeg_fdct_1x1           jFD1x1
 103 #define jpeg_fdct_9x9           jFD9x9
 104 #define jpeg_fdct_10x10         jFD10x10
 105 #define jpeg_fdct_11x11         jFD11x11
 106 #define jpeg_fdct_12x12         jFD12x12
 107 #define jpeg_fdct_13x13         jFD13x13
 108 #define jpeg_fdct_14x14         jFD14x14
 109 #define jpeg_fdct_15x15         jFD15x15
 110 #define jpeg_fdct_16x16         jFD16x16
 111 #define jpeg_fdct_16x8          jFD16x8
 112 #define jpeg_fdct_14x7          jFD14x7
 113 #define jpeg_fdct_12x6          jFD12x6
 114 #define jpeg_fdct_10x5          jFD10x5
 115 #define jpeg_fdct_8x4           jFD8x4
 116 #define jpeg_fdct_6x3           jFD6x3
 117 #define jpeg_fdct_4x2           jFD4x2
 118 #define jpeg_fdct_2x1           jFD2x1
 119 #define jpeg_fdct_8x16          jFD8x16
 120 #define jpeg_fdct_7x14          jFD7x14
 121 #define jpeg_fdct_6x12          jFD6x12
 122 #define jpeg_fdct_5x10          jFD5x10
 123 #define jpeg_fdct_4x8           jFD4x8
 124 #define jpeg_fdct_3x6           jFD3x6
 125 #define jpeg_fdct_2x4           jFD2x4
 126 #define jpeg_fdct_1x2           jFD1x2
 127 #define jpeg_idct_islow         jRDislow
 128 #define jpeg_idct_ifast         jRDifast
 129 #define jpeg_idct_float         jRDfloat
 130 #define jpeg_idct_7x7           jRD7x7
 131 #define jpeg_idct_6x6           jRD6x6
 132 #define jpeg_idct_5x5           jRD5x5
 133 #define jpeg_idct_4x4           jRD4x4
 134 #define jpeg_idct_3x3           jRD3x3
 135 #define jpeg_idct_2x2           jRD2x2
 136 #define jpeg_idct_1x1           jRD1x1
 137 #define jpeg_idct_9x9           jRD9x9
 138 #define jpeg_idct_10x10         jRD10x10
 139 #define jpeg_idct_11x11         jRD11x11
 140 #define jpeg_idct_12x12         jRD12x12
 141 #define jpeg_idct_13x13         jRD13x13
 142 #define jpeg_idct_14x14         jRD14x14
 143 #define jpeg_idct_15x15         jRD15x15
 144 #define jpeg_idct_16x16         jRD16x16
 145 #define jpeg_idct_16x8          jRD16x8
 146 #define jpeg_idct_14x7          jRD14x7
 147 #define jpeg_idct_12x6          jRD12x6
 148 #define jpeg_idct_10x5          jRD10x5
 149 #define jpeg_idct_8x4           jRD8x4
 150 #define jpeg_idct_6x3           jRD6x3
 151 #define jpeg_idct_4x2           jRD4x2
 152 #define jpeg_idct_2x1           jRD2x1
 153 #define jpeg_idct_8x16          jRD8x16
 154 #define jpeg_idct_7x14          jRD7x14
 155 #define jpeg_idct_6x12          jRD6x12
 156 #define jpeg_idct_5x10          jRD5x10
 157 #define jpeg_idct_4x8           jRD4x8
 158 #define jpeg_idct_3x6           jRD3x8
 159 #define jpeg_idct_2x4           jRD2x4
 160 #define jpeg_idct_1x2           jRD1x2
 161 #endif /* NEED_SHORT_EXTERNAL_NAMES */
 162
 163 /* Extern declarations for the forward and inverse DCT routines. */
 164
 165 EXTERN(void) jpeg_fdct_islow
 166     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 167 EXTERN(void) jpeg_fdct_ifast
 168     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 169 EXTERN(void) jpeg_fdct_float
 170     JPP((FAST_FLOAT * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 171 EXTERN(void) jpeg_fdct_7x7
 172     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 173 EXTERN(void) jpeg_fdct_6x6
 174     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 175 EXTERN(void) jpeg_fdct_5x5
 176     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 177 EXTERN(void) jpeg_fdct_4x4
 178     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 179 EXTERN(void) jpeg_fdct_3x3
 180     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 181 EXTERN(void) jpeg_fdct_2x2
 182     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 183 EXTERN(void) jpeg_fdct_1x1
 184     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 185 EXTERN(void) jpeg_fdct_9x9
 186     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 187 EXTERN(void) jpeg_fdct_10x10
 188     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 189 EXTERN(void) jpeg_fdct_11x11
 190     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 191 EXTERN(void) jpeg_fdct_12x12
 192     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 193 EXTERN(void) jpeg_fdct_13x13
 194     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 195 EXTERN(void) jpeg_fdct_14x14
 196     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 197 EXTERN(void) jpeg_fdct_15x15
 198     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 199 EXTERN(void) jpeg_fdct_16x16
 200     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 201 EXTERN(void) jpeg_fdct_16x8
 202     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 203 EXTERN(void) jpeg_fdct_14x7
 204     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 205 EXTERN(void) jpeg_fdct_12x6
 206     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 207 EXTERN(void) jpeg_fdct_10x5
 208     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 209 EXTERN(void) jpeg_fdct_8x4
 210     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 211 EXTERN(void) jpeg_fdct_6x3
 212     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 213 EXTERN(void) jpeg_fdct_4x2
 214     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 215 EXTERN(void) jpeg_fdct_2x1
 216     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 217 EXTERN(void) jpeg_fdct_8x16
 218     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 219 EXTERN(void) jpeg_fdct_7x14
 220     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 221 EXTERN(void) jpeg_fdct_6x12
 222     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 223 EXTERN(void) jpeg_fdct_5x10
 224     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 225 EXTERN(void) jpeg_fdct_4x8
 226     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 227 EXTERN(void) jpeg_fdct_3x6
 228     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 229 EXTERN(void) jpeg_fdct_2x4
 230     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 231 EXTERN(void) jpeg_fdct_1x2
 232     JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col));
 233
 234 EXTERN(void) jpeg_idct_islow
 235     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 236          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 237 EXTERN(void) jpeg_idct_ifast
 238     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 239          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 240 EXTERN(void) jpeg_idct_float
 241     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 242          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 243 EXTERN(void) jpeg_idct_7x7
 244     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 245          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 246 EXTERN(void) jpeg_idct_6x6
 247     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 248          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 249 EXTERN(void) jpeg_idct_5x5
 250     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 251          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 252 EXTERN(void) jpeg_idct_4x4
 253     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 254          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 255 EXTERN(void) jpeg_idct_3x3
 256     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 257          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 258 EXTERN(void) jpeg_idct_2x2
 259     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 260          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 261 EXTERN(void) jpeg_idct_1x1
 262     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 263          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 264 EXTERN(void) jpeg_idct_9x9
 265     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 266          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 267 EXTERN(void) jpeg_idct_10x10
 268     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 269          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 270 EXTERN(void) jpeg_idct_11x11
 271     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 272          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 273 EXTERN(void) jpeg_idct_12x12
 274     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 275          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 276 EXTERN(void) jpeg_idct_13x13
 277     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 278          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 279 EXTERN(void) jpeg_idct_14x14
 280     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 281          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 282 EXTERN(void) jpeg_idct_15x15
 283     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 284          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 285 EXTERN(void) jpeg_idct_16x16
 286     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 287          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 288 EXTERN(void) jpeg_idct_16x8
 289     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 290          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 291 EXTERN(void) jpeg_idct_14x7
 292     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 293          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 294 EXTERN(void) jpeg_idct_12x6
 295     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 296          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 297 EXTERN(void) jpeg_idct_10x5
 298     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 299          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 300 EXTERN(void) jpeg_idct_8x4
 301     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 302          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 303 EXTERN(void) jpeg_idct_6x3
 304     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 305          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 306 EXTERN(void) jpeg_idct_4x2
 307     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 308          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 309 EXTERN(void) jpeg_idct_2x1
 310     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 311          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 312 EXTERN(void) jpeg_idct_8x16
 313     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 314          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 315 EXTERN(void) jpeg_idct_7x14
 316     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 317          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 318 EXTERN(void) jpeg_idct_6x12
 319     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 320          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 321 EXTERN(void) jpeg_idct_5x10
 322     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 323          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 324 EXTERN(void) jpeg_idct_4x8
 325     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 326          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 327 EXTERN(void) jpeg_idct_3x6
 328     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 329          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 330 EXTERN(void) jpeg_idct_2x4
 331     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 332          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 333 EXTERN(void) jpeg_idct_1x2
 334     JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr,
 335          JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col));
 336
 337
 338 /*
 339  * Macros for handling fixed-point arithmetic; these are used by many
 340  * but not all of the DCT/IDCT modules.
 341  *
 342  * All values are expected to be of type INT32.
 343  * Fractional constants are scaled left by CONST_BITS bits.
 344  * CONST_BITS is defined within each module using these macros,
 345  * and may differ from one module to the next.
 346  */
 347
 348 #define ONE     ((INT32) 1)
 349 #define CONST_SCALE (ONE << CONST_BITS)
 350
 351 /* Convert a positive real constant to an integer scaled by CONST_SCALE.
 352  * Caution: some C compilers fail to reduce "FIX(constant)" at compile time,
 353  * thus causing a lot of useless floating-point operations at run time.
 354  */
 355
 356 #define FIX(x)  ((INT32) ((x) * CONST_SCALE + 0.5))
 357
 358 /* Descale and correctly round an INT32 value that's scaled by N bits.
 359  * We assume RIGHT_SHIFT rounds towards minus infinity, so adding
 360  * the fudge factor is correct for either sign of X.
 361  */
 362
 363 #define DESCALE(x,n)  RIGHT_SHIFT((x) + (ONE << ((n)-1)), n)
 364
 365 /* Multiply an INT32 variable by an INT32 constant to yield an INT32 result.
 366  * This macro is used only when the two inputs will actually be no more than
 367  * 16 bits wide, so that a 16x16->32 bit multiply can be used instead of a
 368  * full 32x32 multiply.  This provides a useful speedup on many machines.
 369  * Unfortunately there is no way to specify a 16x16->32 multiply portably
 370  * in C, but some C compilers will do the right thing if you provide the
 371  * correct combination of casts.
 372  */
 373
 374 #ifdef SHORTxSHORT_32           /* may work if 'int' is 32 bits */
 375 #define MULTIPLY16C16(var,const)  (((INT16) (var)) * ((INT16) (const)))
 376 #endif
 377 #ifdef SHORTxLCONST_32          /* known to work with Microsoft C 6.0 */
 378 #define MULTIPLY16C16(var,const)  (((INT16) (var)) * ((INT32) (const)))
 379 #endif
 380
 381 #ifndef MULTIPLY16C16           /* default definition */
 382 #define MULTIPLY16C16(var,const)  ((var) * (const))
 383 #endif
 384
 385 /* Same except both inputs are variables. */
 386
 387 #ifdef SHORTxSHORT_32           /* may work if 'int' is 32 bits */
 388 #define MULTIPLY16V16(var1,var2)  (((INT16) (var1)) * ((INT16) (var2)))
 389 #endif
 390
 391 #ifndef MULTIPLY16V16           /* default definition */
 392 #define MULTIPLY16V16(var1,var2)  ((var1) * (var2))
 393 #endif