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significant speed improvement (about 55%)

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This commit is contained in:
homm 2014-10-18 23:56:17 +04:00
parent 22668de6db
commit d91d7b9826
1 changed files with 42 additions and 4 deletions
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46
libImaging/BoxBlur.c
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@ -202,7 +202,7 @@ HorizontalBoxBlur(Imaging im, Imaging imOut, float floatRadius)
);
// Commit.
for (x = 0; x < im->xsize; x++) {
imOut->image8[x][y] = ((UINT8 *)lineOut)[x];
imOut->image8[y][x] = ((UINT8 *)lineOut)[x];
}
}
}
@ -218,7 +218,7 @@ HorizontalBoxBlur(Imaging im, Imaging imOut, float floatRadius)
);
// Commit.
for (x = 0; x < im->xsize; x++) {
imOut->image32[x][y] = lineOut[x];
imOut->image32[y][x] = lineOut[x];
}
}
}
@ -230,6 +230,42 @@ HorizontalBoxBlur(Imaging im, Imaging imOut, float floatRadius)
return imOut;
}
void
TransposeImage(Imaging im, Imaging imOut)
{
int x, y, xx, yy, xxsize, yysize;
int size = 64;
if (im->image8)
{
for (y = 0; y < im->ysize; y += size) {
for (x = 0; x < im->xsize; x += size) {
yysize = MIN(size, im->ysize - y);
xxsize = MIN(size, im->xsize - x);
for (yy = 0; yy < yysize; yy++) {
for (xx = 0; xx < xxsize; xx++) {
imOut->image8[x + xx][y + yy] = im->image8[y + yy][x + xx];
}
}
}
}
}
else
{
for (y = 0; y < im->ysize; y += size) {
for (x = 0; x < im->xsize; x += size) {
yysize = MIN(size, im->ysize - y);
xxsize = MIN(size, im->xsize - x);
for (yy = 0; yy < yysize; yy++) {
for (xx = 0; xx < xxsize; xx++) {
imOut->image32[x + xx][y + yy] = im->image32[y + yy][x + xx];
}
}
}
}
}
}
Imaging
ImagingBoxBlur(Imaging im, Imaging imOut, float radius)
@ -259,12 +295,14 @@ ImagingBoxBlur(Imaging im, Imaging imOut, float radius)
/* Apply one-dimensional blur.
HorizontalBoxBlur32 transposes image at same time. */
HorizontalBoxBlur(im, temp, radius);
HorizontalBoxBlur(im, imOut, radius);
TransposeImage(imOut, temp);
/* Blur transposed result from previout step in same direction.
Reseult will be transposed again. We'll get original image
blurred in both directions. */
HorizontalBoxBlur(temp, imOut, radius);
HorizontalBoxBlur(temp, temp, radius);
TransposeImage(temp, imOut);
ImagingDelete(temp);