- block[stride*0 + xStride*0]= ((a+c)*qmul) >> 7;
- block[stride*0 + xStride*1]= ((e+b)*qmul) >> 7;
- block[stride*1 + xStride*0]= ((a-c)*qmul) >> 7;
- block[stride*1 + xStride*1]= ((e-b)*qmul) >> 7;
+ block[stride*0 + xStride*0]= (int)((a+c)*qmul) >> 7;
+ block[stride*0 + xStride*1]= (int)((e+b)*qmul) >> 7;
+ block[stride*1 + xStride*0]= (int)((a-c)*qmul) >> 7;
+ block[stride*1 + xStride*1]= (int)((e-b)*qmul) >> 7;