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This commit is contained in:
homm 2014-10-12 22:26:00 +04:00
parent e95382eb08
commit 92635d0624
1 changed files with 69 additions and 6 deletions
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75
libImaging/BoxBlur.c
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@ -2,6 +2,67 @@
#include "Imaging.h"
Imaging
HorizontalBoxBlur8(Imaging im, Imaging imOut, float floatRadius)
{
ImagingSectionCookie cookie;
int x, y, pix;
unsigned int acc;
unsigned int bulk;
UINT8 *line;
int lastx = im->xsize - 1;
int radius = (int) floatRadius;
UINT8 rem = (UINT8) (256 * (floatRadius - radius));
int w = (int) (256 * (floatRadius * 2 + 1));
int w2 = w / 2;
// printf("%d %d %d\n", rem, w, w2);
ImagingSectionEnter(&cookie);
for (y = 0; y < im->ysize; y++) {
line = im->image8[y];
/* Compute acc for -1 pixel (outside of image):
From "-radius-1" to "0" get first pixel,
then from "1" to "radius-1". */
acc = line[0] * (radius + 1);
for (pix = 0; pix < radius; pix++) {
acc += line[pix];
}
/* Substract pixel from left ("0").
Add pixels from radius. */
for (x = 0; x <= radius; x++) {
acc = acc + line[x + radius] - line[0];
bulk = (acc << 8) + line[0] * rem + line[x + radius + 1] * rem;
imOut->image8[x][y] = (UINT8)((bulk + w2) / w);
}
/* Substract previous pixel from "-radius".
Add pixels from radius. */
for (x = radius + 1; x < im->xsize - radius; x++) {
acc = acc + line[x + radius] - line[x - radius - 1];
bulk = (acc << 8) + line[x - radius - 1] * rem + line[x + radius + 1] * rem;
imOut->image8[x][y] = (UINT8)((bulk + w2) / w);
}
/* Substract previous pixel from "-radius".
Add last pixel. */
for (x = im->xsize - radius; x < im->xsize; x++) {
acc = acc + line[lastx] - line[x - radius - 1];
bulk = (acc << 8) + line[x - radius - 1] * rem + line[lastx] * rem;
imOut->image8[x][y] = (UINT8)((bulk + w2) / w);
}
}
ImagingSectionLeave(&cookie);
return imOut;
}
Imaging
HorizontalBoxBlur32(Imaging im, Imaging imOut, float floatRadius)
{
@ -100,17 +161,19 @@ ImagingBoxBlur(Imaging im, Imaging imOut, float radius)
/* Apply one-dimensional blur.
HorizontalBoxBlur32 transposes image at same time. */
if ( ! HorizontalBoxBlur32(im, temp, radius)) {
ImagingDelete(temp);
return NULL;
if (strcmp(im->mode, "L") == 0) {
HorizontalBoxBlur8(im, temp, radius);
} else {
HorizontalBoxBlur32(im, temp, radius);
}
/* 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;
if (strcmp(im->mode, "L") == 0) {
HorizontalBoxBlur8(temp, imOut, radius);
} else {
HorizontalBoxBlur32(temp, imOut, radius);
}
ImagingDelete(temp);