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Speedup for boxblur

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This commit is contained in:
heckflosse 2015-11-01 13:41:21 +01:00
parent 71303fd51c
commit 0120bcd836
1 changed files with 30 additions and 2 deletions
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32
rtengine/boxblur.h
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@ -136,7 +136,6 @@ template<class T, class A> void boxblurnew (T** src, A** dst, T* buffer, int rad
//box blur image; box range = (radx,rady)
float* temp = buffer;
if (radx == 0) {
#ifdef _OPENMP
#pragma omp for
@ -186,12 +185,41 @@ template<class T, class A> void boxblurnew (T** src, A** dst, T* buffer, int rad
dst[row][col] = temp[row * W + col];
}
} else {
const int numCols = 8; // process numCols columns at once for better usage of L1 cpu cache
//vertical blur
#ifdef _OPENMP
#pragma omp for
#endif
for (int col = 0; col < W; col++) {
for (int col = 0; col < W-numCols+1; col+=8) {
int len = rady + 1;
for(int k=0;k<numCols;k++)
dst[0][col + k] = temp[0 * W + col + k] / len;
for (int i = 1; i <= rady; i++) {
for(int k=0;k<numCols;k++)
dst[0][col + k] += temp[i * W + col + k] / len;
}
for (int row = 1; row <= rady; row++) {
for(int k=0;k<numCols;k++)
dst[row][col+k] = (dst[(row - 1)][col+k] * len + temp[(row + rady) * W + col+k]) / (len + 1);
len ++;
}
for (int row = rady + 1; row < H - rady; row++) {
for(int k=0;k<numCols;k++)
dst[row][col+k] = dst[(row - 1)][col+k] + (temp[(row + rady) * W + col+k] - temp[(row - rady - 1) * W + col+k]) / len;
}
for (int row = H - rady; row < H; row++) {
for(int k=0;k<numCols;k++)
dst[row][col+k] = (dst[(row - 1)][col+k] * len - temp[(row - rady - 1) * W + col+k]) / (len - 1);
len --;
}
}
#pragma omp single
for (int col = W-(W%numCols); col < W; col++) {
int len = rady + 1;
dst[0][col] = temp[0 * W + col] / len;