void simple_idct84_add(UINT8 *dest, int line_size, INT16 *block)
void simple_idct84_add(UINT8 *dest, int line_size, DCTELEM *block)
void simple_idct84_add(UINT8 *dest, int line_size, INT16 *block){    int i;    /* IDCT8 on each line */    for(i=0; i<4; i++) {        idctRowCondDC(block + i*8);    }    /* IDCT4 and store */    for(i=0;i<8;i++) {        idct4col_add(dest + i, line_size, block + i);    }}