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blur in both directions

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This commit is contained in:
homm 2014-10-12 17:59:20 +04:00
parent cc9eff5c68
commit b7b3c719fa
1 changed files with 25 additions and 4 deletions
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29
libImaging/BoxBlur.c
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@ -53,19 +53,19 @@ HorizontalBoxBlur32(Imaging im, Imaging imOut, int radius)
Add pixels from radius. */
for (x = 0; x <= radius; x++) {
MOVE_ACC(acc, 0, x + radius);
imOut->image32[y][x] = SAVE(acc);
imOut->image32[x][y] = SAVE(acc);
}
/* Substract previous pixel from "-radius".
Add pixels from radius. */
for (x = radius + 1; x < im->xsize - radius; x++) {
MOVE_ACC(acc, x - radius - 1, x + radius);
imOut->image32[y][x] = SAVE(acc);
imOut->image32[x][y] = SAVE(acc);
}
/* Substract previous pixel from "-radius".
Add last pixel. */
for (x = im->xsize - radius; x < im->xsize; x++) {
MOVE_ACC(acc, x - radius - 1, lastx);
imOut->image32[y][x] = SAVE(acc);
imOut->image32[x][y] = SAVE(acc);
}
}
@ -78,6 +78,27 @@ HorizontalBoxBlur32(Imaging im, Imaging imOut, int radius)
Imaging
ImagingBoxBlur(Imaging im, Imaging imOut, int radius)
{
HorizontalBoxBlur32(im, imOut, radius);
/* Create transposed temp image (im->ysize x im->xsize). */
Imaging temp = ImagingNew(im->mode, im->ysize, im->xsize);
if ( ! temp)
return NULL;
/* Apply one-dimensional blur.
HorizontalBoxBlur32 transposes image at same time. */
if ( ! HorizontalBoxBlur32(im, temp, radius)) {
ImagingDelete(temp);
return NULL;
}
/* Blur in same direction transposed result from previout step.
Reseult will be transposes again. We'll get original image
blurred in both directions. */
if ( ! HorizontalBoxBlur32(temp, imOut, radius)) {
ImagingDelete(temp);
return NULL;
}
ImagingDelete(temp);
return imOut;
}