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speedup by unrolling loops

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This commit is contained in:
homm 2014-10-26 01:20:24 +04:00
parent c22af89ef0
commit 42967dd1a6
1 changed files with 23 additions and 9 deletions
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32
libImaging/Antialias.c
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@ -100,8 +100,8 @@ ImagingStretchHorizaontal(Imaging imIn, int xsize, int filter)
Imaging imOut;
struct filter *filterp;
float support, scale, filterscale;
float center, ww, ss;
int xx, yy, x, b, kmax, xmin, xmax;
float center, ww, ss, ss4[4];
int xx, yy, x, kmax, xmin, xmax;
int *xbounds;
float *k, *kk;
@ -204,13 +204,27 @@ ImagingStretchHorizaontal(Imaging imIn, int xsize, int filter)
xmin = xbounds[xx * 2 + 0];
xmax = xbounds[xx * 2 + 1];
k = &kk[xx * kmax];
for (b = 0; b < imIn->bands; b++) {
if (imIn->bands == 2 && b)
b = 3; /* hack to deal with LA images */
ss = 0.5;
for (x = xmin; x < xmax; x++)
ss = ss + (UINT8) imIn->image[yy][x*4+b] * k[x - xmin];
imOut->image[yy][xx*4+b] = clip8(ss);
if (imIn->bands == 3) {
ss4[0] = ss4[1] = ss4[2] = 0.5;
for (x = xmin; x < xmax; x++) {
ss4[0] += (UINT8) imIn->image[yy][x*4 + 0] * k[x - xmin];
ss4[1] += (UINT8) imIn->image[yy][x*4 + 1] * k[x - xmin];
ss4[2] += (UINT8) imIn->image[yy][x*4 + 2] * k[x - xmin];
}
imOut->image32[yy][xx] =
clip8(ss4[0]) | clip8(ss4[1]) << 8 |
clip8(ss4[2]) << 16;
} else {
ss4[0] = ss4[1] = ss4[2] = ss4[3] = 0.5;
for (x = xmin; x < xmax; x++) {
ss4[0] += (UINT8) imIn->image[yy][x*4 + 0] * k[x - xmin];
ss4[1] += (UINT8) imIn->image[yy][x*4 + 1] * k[x - xmin];
ss4[2] += (UINT8) imIn->image[yy][x*4 + 2] * k[x - xmin];
ss4[3] += (UINT8) imIn->image[yy][x*4 + 3] * k[x - xmin];
}
imOut->image32[yy][xx] =
clip8(ss4[0]) | clip8(ss4[1]) << 8 |
clip8(ss4[2]) << 16 | clip8(ss4[3]) << 24;
}
}
break;