- const int a0 = block[i+0*8] + block[i+4*8];
- const int a2 = block[i+0*8] - block[i+4*8];
- const int a4 = (block[i+2*8]>>1) - block[i+6*8];
- const int a6 = (block[i+6*8]>>1) + block[i+2*8];
-
- const int b0 = a0 + a6;
- const int b2 = a2 + a4;
- const int b4 = a2 - a4;
- const int b6 = a0 - a6;
-
- const int a1 = -block[i+3*8] + block[i+5*8] - block[i+7*8] - (block[i+7*8]>>1);
- const int a3 = block[i+1*8] + block[i+7*8] - block[i+3*8] - (block[i+3*8]>>1);
- const int a5 = -block[i+1*8] + block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1);
- const int a7 = block[i+3*8] + block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1);
+ const unsigned int a0 = block[i+0*8] + block[i+4*8];
+ const unsigned int a2 = block[i+0*8] - block[i+4*8];
+ const unsigned int a4 = (block[i+2*8]>>1) - block[i+6*8];
+ const unsigned int a6 = (block[i+6*8]>>1) + block[i+2*8];
+
+ const unsigned int b0 = a0 + a6;
+ const unsigned int b2 = a2 + a4;
+ const unsigned int b4 = a2 - a4;
+ const unsigned int b6 = a0 - a6;
+
+ const int a1 = -block[i+3*8] + (unsigned)block[i+5*8] - block[i+7*8] - (block[i+7*8]>>1);
+ const int a3 = block[i+1*8] + (unsigned)block[i+7*8] - block[i+3*8] - (block[i+3*8]>>1);
+ const int a5 = -block[i+1*8] + (unsigned)block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1);
+ const int a7 = block[i+3*8] + (unsigned)block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1);