python-pillow/Pillow
1
1
Fork 0
mirror of https://github.com/python-pillow/Pillow.git synced 2024-11-11 04:07:21 +03:00
Code Issues Packages Projects Releases Wiki Activity

float radius

Browse Source
This commit is contained in:
homm 2014-10-12 20:01:49 +04:00
parent 23068e49be
commit f711ab3eb6
1 changed files with 24 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
libImaging/BoxBlur.c
View File

@ -9,17 +9,15 @@ HorizontalBoxBlur32(Imaging im, Imaging imOut, float floatRadius)
int x, y, pix;
int acc[4];
float bulk[4];
typedef UINT8 pixel[4];
pixel *line;
int lastx = im->xsize - 1;
int radius = (int) floatRadius;
int window = radius * 2 + 1;
#define SAVE(acc) \
(UINT8)(acc[0] / window) | (UINT8)(acc[1] / window) << 8 | \
(UINT8)(acc[2] / window) << 16 | (UINT8)(acc[3] / window) << 24
float rem = floatRadius - radius;
float window = floatRadius * 2 + 1;
#define MOVE_ACC(acc, substract, add) \
acc[0] -= line[substract][0]; \
@ -31,6 +29,16 @@ HorizontalBoxBlur32(Imaging im, Imaging imOut, float floatRadius)
acc[2] += line[add][2]; \
acc[3] += line[add][3];
#define ADD_FAR(bulk, acc, left, right) \
bulk[0] = acc[0] + line[left][0] * rem + line[right][0] * rem; \
bulk[1] = acc[1] + line[left][1] * rem + line[right][1] * rem; \
bulk[2] = acc[2] + line[left][2] * rem + line[right][2] * rem; \
bulk[3] = acc[3] + line[left][3] * rem + line[right][3] * rem;
#define SAVE(acc) \
(UINT8)((acc[0] + .5) / window) | (UINT8)((acc[1] + .5) / window) << 8 | \
(UINT8)((acc[2] + .5) / window) << 16 | (UINT8)((acc[3] + .5) / window) << 24
ImagingSectionEnter(&cookie);
for (y = 0; y < im->ysize; y++) {
@ -39,11 +47,11 @@ HorizontalBoxBlur32(Imaging im, Imaging imOut, float floatRadius)
/* Compute acc for -1 pixel (outside of image):
From "-radius-1" to "0" get first pixel,
then from "1" to "radius-1". */
acc[0] = line[0][0] * (radius + 2);
acc[1] = line[0][1] * (radius + 2);
acc[2] = line[0][2] * (radius + 2);
acc[3] = line[0][3] * (radius + 2);
for (pix = 1; pix < radius; pix++) {
acc[0] = line[0][0] * (radius + 1);
acc[1] = line[0][1] * (radius + 1);
acc[2] = line[0][2] * (radius + 1);
acc[3] = line[0][3] * (radius + 1);
for (pix = 0; pix < radius; pix++) {
acc[0] += line[pix][0];
acc[1] += line[pix][1];
acc[2] += line[pix][2];
@ -54,19 +62,22 @@ HorizontalBoxBlur32(Imaging im, Imaging imOut, float floatRadius)
Add pixels from radius. */
for (x = 0; x <= radius; x++) {
MOVE_ACC(acc, 0, x + radius);
imOut->image32[x][y] = SAVE(acc);
ADD_FAR(bulk, acc, 0, x+radius+1);
imOut->image32[x][y] = SAVE(bulk);
}
/* 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[x][y] = SAVE(acc);
ADD_FAR(bulk, acc, x-radius-1, x+radius+1);
imOut->image32[x][y] = SAVE(bulk);
}
/* 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[x][y] = SAVE(acc);
ADD_FAR(bulk, acc, x-radius-1, lastx);
imOut->image32[x][y] = SAVE(bulk);
}
}