static inline void idct_1d(int *blk, int step)
{
- const int t0 = blk[0 * step] + blk[4 * step];
- const int t1 = blk[0 * step] - blk[4 * step];
- const int t2 = blk[2 * step] + blk[6 * step];
- const int t3 = ((int)((blk[2 * step] - blk[6 * step]) * 362U) >> 8) - t2;
- const int t4 = t0 + t2;
- const int t5 = t0 - t2;
- const int t6 = t1 + t3;
- const int t7 = t1 - t3;
- const int t8 = blk[5 * step] + blk[3 * step];
- const int t9 = blk[5 * step] - blk[3 * step];
- const int tA = blk[1 * step] + blk[7 * step];
- const int tB = blk[1 * step] - blk[7 * step];
- const int tC = t8 + tA;
- const int tD = (int)((tB + t9) * 473U) >> 8;
- const int tE = (((int)(t9 * -669U) >> 8) - tC) + tD;
- const int tF = ((int)((tA - t8) * 362U) >> 8) - tE;
- const int t10 = (((int)(tB * 277U) >> 8) - tD) + tF;
+ const unsigned t0 = blk[0 * step] + blk[4 * step];
+ const unsigned t1 = blk[0 * step] - blk[4 * step];
+ const unsigned t2 = blk[2 * step] + blk[6 * step];
+ const unsigned t3 = ((int)((blk[2 * step] - blk[6 * step]) * 362U) >> 8) - t2;
+ const unsigned t4 = t0 + t2;
+ const unsigned t5 = t0 - t2;
+ const unsigned t6 = t1 + t3;
+ const unsigned t7 = t1 - t3;
+ const unsigned t8 = blk[5 * step] + blk[3 * step];
+ const unsigned t9 = blk[5 * step] - blk[3 * step];
+ const unsigned tA = blk[1 * step] + blk[7 * step];
+ const unsigned tB = blk[1 * step] - blk[7 * step];
+ const unsigned tC = t8 + tA;
+ const unsigned tD = (int)((tB + t9) * 473U) >> 8;
+ const unsigned tE = (((int)(t9 * -669U) >> 8) - tC) + tD;
+ const unsigned tF = ((int)((tA - t8) * 362U) >> 8) - tE;
+ const unsigned t10 = (((int)(tB * 277U) >> 8) - tD) + tF;
blk[0 * step] = t4 + tC;
blk[1 * step] = t6 + tE;