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jdct.h
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00001 /* 00002 * jdct.h 00003 * 00004 * Copyright (C) 1994-1996, Thomas G. Lane. 00005 * This file is part of the Independent JPEG Group's software. 00006 * For conditions of distribution and use, see the accompanying README file. 00007 * 00008 * This include file contains common declarations for the forward and 00009 * inverse DCT modules. These declarations are private to the DCT managers 00010 * (jcdctmgr.c, jddctmgr.c) and the individual DCT algorithms. 00011 * The individual DCT algorithms are kept in separate files to ease 00012 * machine-dependent tuning (e.g., assembly coding). 00013 */ 00014 00015 00016 /* 00017 * A forward DCT routine is given a pointer to an input sample array and 00018 * a pointer to a work area of type DCTELEM[]; the DCT is to be performed 00019 * in-place in that buffer. Type DCTELEM is int for 8-bit samples, INT32 00020 * for 12-bit samples. (NOTE: Floating-point DCT implementations use an 00021 * array of type FAST_FLOAT, instead.) 00022 * The input data is to be fetched from the sample array starting at a 00023 * specified column. (Any row offset needed will be applied to the array 00024 * pointer before it is passed to the FDCT code.) 00025 * Note that the number of samples fetched by the FDCT routine is 00026 * DCT_h_scaled_size * DCT_v_scaled_size. 00027 * The DCT outputs are returned scaled up by a factor of 8; they therefore 00028 * have a range of +-8K for 8-bit data, +-128K for 12-bit data. This 00029 * convention improves accuracy in integer implementations and saves some 00030 * work in floating-point ones. 00031 * Quantization of the output coefficients is done by jcdctmgr.c. 00032 */ 00033 00034 #if BITS_IN_JSAMPLE == 8 00035 typedef int DCTELEM; /* 16 or 32 bits is fine */ 00036 #else 00037 typedef INT32 DCTELEM; /* must have 32 bits */ 00038 #endif 00039 00040 typedef JMETHOD(void, forward_DCT_method_ptr, (DCTELEM * data, 00041 JSAMPARRAY sample_data, 00042 JDIMENSION start_col)); 00043 typedef JMETHOD(void, float_DCT_method_ptr, (FAST_FLOAT * data, 00044 JSAMPARRAY sample_data, 00045 JDIMENSION start_col)); 00046 00047 00048 /* 00049 * An inverse DCT routine is given a pointer to the input JBLOCK and a pointer 00050 * to an output sample array. The routine must dequantize the input data as 00051 * well as perform the IDCT; for dequantization, it uses the multiplier table 00052 * pointed to by compptr->dct_table. The output data is to be placed into the 00053 * sample array starting at a specified column. (Any row offset needed will 00054 * be applied to the array pointer before it is passed to the IDCT code.) 00055 * Note that the number of samples emitted by the IDCT routine is 00056 * DCT_h_scaled_size * DCT_v_scaled_size. 00057 */ 00058 00059 /* typedef inverse_DCT_method_ptr is declared in jpegint.h */ 00060 00061 /* 00062 * Each IDCT routine has its own ideas about the best dct_table element type. 00063 */ 00064 00065 typedef MULTIPLIER ISLOW_MULT_TYPE; /* short or int, whichever is faster */ 00066 #if BITS_IN_JSAMPLE == 8 00067 typedef MULTIPLIER IFAST_MULT_TYPE; /* 16 bits is OK, use short if faster */ 00068 #define IFAST_SCALE_BITS 2 /* fractional bits in scale factors */ 00069 #else 00070 typedef INT32 IFAST_MULT_TYPE; /* need 32 bits for scaled quantizers */ 00071 #define IFAST_SCALE_BITS 13 /* fractional bits in scale factors */ 00072 #endif 00073 typedef FAST_FLOAT FLOAT_MULT_TYPE; /* preferred floating type */ 00074 00075 00076 /* 00077 * Each IDCT routine is responsible for range-limiting its results and 00078 * converting them to unsigned form (0..MAXJSAMPLE). The raw outputs could 00079 * be quite far out of range if the input data is corrupt, so a bulletproof 00080 * range-limiting step is required. We use a mask-and-table-lookup method 00081 * to do the combined operations quickly. See the comments with 00082 * prepare_range_limit_table (in jdmaster.c) for more info. 00083 */ 00084 00085 #define IDCT_range_limit(cinfo) ((cinfo)->sample_range_limit + CENTERJSAMPLE) 00086 00087 #define RANGE_MASK (MAXJSAMPLE * 4 + 3) /* 2 bits wider than legal samples */ 00088 00089 00090 /* Short forms of external names for systems with brain-damaged linkers. */ 00091 00092 #ifdef NEED_SHORT_EXTERNAL_NAMES 00093 #define jpeg_fdct_islow jFDislow 00094 #define jpeg_fdct_ifast jFDifast 00095 #define jpeg_fdct_float jFDfloat 00096 #define jpeg_fdct_7x7 jFD7x7 00097 #define jpeg_fdct_6x6 jFD6x6 00098 #define jpeg_fdct_5x5 jFD5x5 00099 #define jpeg_fdct_4x4 jFD4x4 00100 #define jpeg_fdct_3x3 jFD3x3 00101 #define jpeg_fdct_2x2 jFD2x2 00102 #define jpeg_fdct_1x1 jFD1x1 00103 #define jpeg_fdct_9x9 jFD9x9 00104 #define jpeg_fdct_10x10 jFD10x10 00105 #define jpeg_fdct_11x11 jFD11x11 00106 #define jpeg_fdct_12x12 jFD12x12 00107 #define jpeg_fdct_13x13 jFD13x13 00108 #define jpeg_fdct_14x14 jFD14x14 00109 #define jpeg_fdct_15x15 jFD15x15 00110 #define jpeg_fdct_16x16 jFD16x16 00111 #define jpeg_fdct_16x8 jFD16x8 00112 #define jpeg_fdct_14x7 jFD14x7 00113 #define jpeg_fdct_12x6 jFD12x6 00114 #define jpeg_fdct_10x5 jFD10x5 00115 #define jpeg_fdct_8x4 jFD8x4 00116 #define jpeg_fdct_6x3 jFD6x3 00117 #define jpeg_fdct_4x2 jFD4x2 00118 #define jpeg_fdct_2x1 jFD2x1 00119 #define jpeg_fdct_8x16 jFD8x16 00120 #define jpeg_fdct_7x14 jFD7x14 00121 #define jpeg_fdct_6x12 jFD6x12 00122 #define jpeg_fdct_5x10 jFD5x10 00123 #define jpeg_fdct_4x8 jFD4x8 00124 #define jpeg_fdct_3x6 jFD3x6 00125 #define jpeg_fdct_2x4 jFD2x4 00126 #define jpeg_fdct_1x2 jFD1x2 00127 #define jpeg_idct_islow jRDislow 00128 #define jpeg_idct_ifast jRDifast 00129 #define jpeg_idct_float jRDfloat 00130 #define jpeg_idct_7x7 jRD7x7 00131 #define jpeg_idct_6x6 jRD6x6 00132 #define jpeg_idct_5x5 jRD5x5 00133 #define jpeg_idct_4x4 jRD4x4 00134 #define jpeg_idct_3x3 jRD3x3 00135 #define jpeg_idct_2x2 jRD2x2 00136 #define jpeg_idct_1x1 jRD1x1 00137 #define jpeg_idct_9x9 jRD9x9 00138 #define jpeg_idct_10x10 jRD10x10 00139 #define jpeg_idct_11x11 jRD11x11 00140 #define jpeg_idct_12x12 jRD12x12 00141 #define jpeg_idct_13x13 jRD13x13 00142 #define jpeg_idct_14x14 jRD14x14 00143 #define jpeg_idct_15x15 jRD15x15 00144 #define jpeg_idct_16x16 jRD16x16 00145 #define jpeg_idct_16x8 jRD16x8 00146 #define jpeg_idct_14x7 jRD14x7 00147 #define jpeg_idct_12x6 jRD12x6 00148 #define jpeg_idct_10x5 jRD10x5 00149 #define jpeg_idct_8x4 jRD8x4 00150 #define jpeg_idct_6x3 jRD6x3 00151 #define jpeg_idct_4x2 jRD4x2 00152 #define jpeg_idct_2x1 jRD2x1 00153 #define jpeg_idct_8x16 jRD8x16 00154 #define jpeg_idct_7x14 jRD7x14 00155 #define jpeg_idct_6x12 jRD6x12 00156 #define jpeg_idct_5x10 jRD5x10 00157 #define jpeg_idct_4x8 jRD4x8 00158 #define jpeg_idct_3x6 jRD3x8 00159 #define jpeg_idct_2x4 jRD2x4 00160 #define jpeg_idct_1x2 jRD1x2 00161 #endif /* NEED_SHORT_EXTERNAL_NAMES */ 00162 00163 /* Extern declarations for the forward and inverse DCT routines. */ 00164 00165 EXTERN(void) jpeg_fdct_islow 00166 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00167 EXTERN(void) jpeg_fdct_ifast 00168 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00169 EXTERN(void) jpeg_fdct_float 00170 JPP((FAST_FLOAT * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00171 EXTERN(void) jpeg_fdct_7x7 00172 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00173 EXTERN(void) jpeg_fdct_6x6 00174 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00175 EXTERN(void) jpeg_fdct_5x5 00176 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00177 EXTERN(void) jpeg_fdct_4x4 00178 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00179 EXTERN(void) jpeg_fdct_3x3 00180 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00181 EXTERN(void) jpeg_fdct_2x2 00182 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00183 EXTERN(void) jpeg_fdct_1x1 00184 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00185 EXTERN(void) jpeg_fdct_9x9 00186 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00187 EXTERN(void) jpeg_fdct_10x10 00188 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00189 EXTERN(void) jpeg_fdct_11x11 00190 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00191 EXTERN(void) jpeg_fdct_12x12 00192 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00193 EXTERN(void) jpeg_fdct_13x13 00194 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00195 EXTERN(void) jpeg_fdct_14x14 00196 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00197 EXTERN(void) jpeg_fdct_15x15 00198 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00199 EXTERN(void) jpeg_fdct_16x16 00200 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00201 EXTERN(void) jpeg_fdct_16x8 00202 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00203 EXTERN(void) jpeg_fdct_14x7 00204 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00205 EXTERN(void) jpeg_fdct_12x6 00206 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00207 EXTERN(void) jpeg_fdct_10x5 00208 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00209 EXTERN(void) jpeg_fdct_8x4 00210 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00211 EXTERN(void) jpeg_fdct_6x3 00212 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00213 EXTERN(void) jpeg_fdct_4x2 00214 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00215 EXTERN(void) jpeg_fdct_2x1 00216 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00217 EXTERN(void) jpeg_fdct_8x16 00218 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00219 EXTERN(void) jpeg_fdct_7x14 00220 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00221 EXTERN(void) jpeg_fdct_6x12 00222 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00223 EXTERN(void) jpeg_fdct_5x10 00224 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00225 EXTERN(void) jpeg_fdct_4x8 00226 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00227 EXTERN(void) jpeg_fdct_3x6 00228 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00229 EXTERN(void) jpeg_fdct_2x4 00230 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00231 EXTERN(void) jpeg_fdct_1x2 00232 JPP((DCTELEM * data, JSAMPARRAY sample_data, JDIMENSION start_col)); 00233 00234 EXTERN(void) jpeg_idct_islow 00235 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00236 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00237 EXTERN(void) jpeg_idct_ifast 00238 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00239 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00240 EXTERN(void) jpeg_idct_float 00241 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00242 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00243 EXTERN(void) jpeg_idct_7x7 00244 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00245 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00246 EXTERN(void) jpeg_idct_6x6 00247 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00248 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00249 EXTERN(void) jpeg_idct_5x5 00250 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00251 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00252 EXTERN(void) jpeg_idct_4x4 00253 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00254 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00255 EXTERN(void) jpeg_idct_3x3 00256 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00257 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00258 EXTERN(void) jpeg_idct_2x2 00259 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00260 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00261 EXTERN(void) jpeg_idct_1x1 00262 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00263 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00264 EXTERN(void) jpeg_idct_9x9 00265 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00266 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00267 EXTERN(void) jpeg_idct_10x10 00268 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00269 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00270 EXTERN(void) jpeg_idct_11x11 00271 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00272 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00273 EXTERN(void) jpeg_idct_12x12 00274 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00275 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00276 EXTERN(void) jpeg_idct_13x13 00277 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00278 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00279 EXTERN(void) jpeg_idct_14x14 00280 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00281 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00282 EXTERN(void) jpeg_idct_15x15 00283 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00284 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00285 EXTERN(void) jpeg_idct_16x16 00286 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00287 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00288 EXTERN(void) jpeg_idct_16x8 00289 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00290 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00291 EXTERN(void) jpeg_idct_14x7 00292 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00293 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00294 EXTERN(void) jpeg_idct_12x6 00295 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00296 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00297 EXTERN(void) jpeg_idct_10x5 00298 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00299 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00300 EXTERN(void) jpeg_idct_8x4 00301 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00302 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00303 EXTERN(void) jpeg_idct_6x3 00304 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00305 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00306 EXTERN(void) jpeg_idct_4x2 00307 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00308 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00309 EXTERN(void) jpeg_idct_2x1 00310 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00311 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00312 EXTERN(void) jpeg_idct_8x16 00313 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00314 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00315 EXTERN(void) jpeg_idct_7x14 00316 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00317 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00318 EXTERN(void) jpeg_idct_6x12 00319 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00320 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00321 EXTERN(void) jpeg_idct_5x10 00322 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00323 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00324 EXTERN(void) jpeg_idct_4x8 00325 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00326 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00327 EXTERN(void) jpeg_idct_3x6 00328 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00329 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00330 EXTERN(void) jpeg_idct_2x4 00331 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00332 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00333 EXTERN(void) jpeg_idct_1x2 00334 JPP((j_decompress_ptr cinfo, jpeg_component_info * compptr, 00335 JCOEFPTR coef_block, JSAMPARRAY output_buf, JDIMENSION output_col)); 00336 00337 00338 /* 00339 * Macros for handling fixed-point arithmetic; these are used by many 00340 * but not all of the DCT/IDCT modules. 00341 * 00342 * All values are expected to be of type INT32. 00343 * Fractional constants are scaled left by CONST_BITS bits. 00344 * CONST_BITS is defined within each module using these macros, 00345 * and may differ from one module to the next. 00346 */ 00347 00348 #define ONE ((INT32) 1) 00349 #define CONST_SCALE (ONE << CONST_BITS) 00350 00351 /* Convert a positive real constant to an integer scaled by CONST_SCALE. 00352 * Caution: some C compilers fail to reduce "FIX(constant)" at compile time, 00353 * thus causing a lot of useless floating-point operations at run time. 00354 */ 00355 00356 #define FIX(x) ((INT32) ((x) * CONST_SCALE + 0.5)) 00357 00358 /* Descale and correctly round an INT32 value that's scaled by N bits. 00359 * We assume RIGHT_SHIFT rounds towards minus infinity, so adding 00360 * the fudge factor is correct for either sign of X. 00361 */ 00362 00363 #define DESCALE(x,n) RIGHT_SHIFT((x) + (ONE << ((n)-1)), n) 00364 00365 /* Multiply an INT32 variable by an INT32 constant to yield an INT32 result. 00366 * This macro is used only when the two inputs will actually be no more than 00367 * 16 bits wide, so that a 16x16->32 bit multiply can be used instead of a 00368 * full 32x32 multiply. This provides a useful speedup on many machines. 00369 * Unfortunately there is no way to specify a 16x16->32 multiply portably 00370 * in C, but some C compilers will do the right thing if you provide the 00371 * correct combination of casts. 00372 */ 00373 00374 #ifdef SHORTxSHORT_32 /* may work if 'int' is 32 bits */ 00375 #define MULTIPLY16C16(var,const) (((INT16) (var)) * ((INT16) (const))) 00376 #endif 00377 #ifdef SHORTxLCONST_32 /* known to work with Microsoft C 6.0 */ 00378 #define MULTIPLY16C16(var,const) (((INT16) (var)) * ((INT32) (const))) 00379 #endif 00380 00381 #ifndef MULTIPLY16C16 /* default definition */ 00382 #define MULTIPLY16C16(var,const) ((var) * (const)) 00383 #endif 00384 00385 /* Same except both inputs are variables. */ 00386 00387 #ifdef SHORTxSHORT_32 /* may work if 'int' is 32 bits */ 00388 #define MULTIPLY16V16(var1,var2) (((INT16) (var1)) * ((INT16) (var2))) 00389 #endif 00390 00391 #ifndef MULTIPLY16V16 /* default definition */ 00392 #define MULTIPLY16V16(var1,var2) ((var1) * (var2)) 00393 #endif
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