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integer implementation for float radius

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This commit is contained in:
homm 2014-10-12 20:30:46 +04:00
parent f3af171dc4
commit e95382eb08
1 changed files with 13 additions and 10 deletions
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23
libImaging/BoxBlur.c
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@ -8,16 +8,19 @@ HorizontalBoxBlur32(Imaging im, Imaging imOut, float floatRadius)
ImagingSectionCookie cookie;
int x, y, pix;
int acc[4];
float bulk[4];
unsigned int acc[4];
unsigned int bulk[4];
typedef UINT8 pixel[4];
pixel *line;
int lastx = im->xsize - 1;
int radius = (int) floatRadius;
float rem = floatRadius - radius;
float window = floatRadius * 2 + 1;
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);
#define MOVE_ACC(acc, substract, add) \
acc[0] -= line[substract][0]; \
@ -30,14 +33,14 @@ HorizontalBoxBlur32(Imaging im, Imaging imOut, float floatRadius)
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;
bulk[0] = (acc[0] << 8) + line[left][0] * rem + line[right][0] * rem; \
bulk[1] = (acc[1] << 8) + line[left][1] * rem + line[right][1] * rem; \
bulk[2] = (acc[2] << 8) + line[left][2] * rem + line[right][2] * rem; \
bulk[3] = (acc[3] << 8) + line[left][3] * rem + line[right][3] * rem;
#define SAVE(acc) \
(UINT8)(acc[0] / window + .5) << 0 | (UINT8)(acc[1] / window + .5) << 8 | \
(UINT8)(acc[2] / window + .5) << 16 | (UINT8)(acc[3] / window + .5) << 24
(UINT8)((acc[0] + w2) / w) << 0 | (UINT8)((acc[1] + w2) / w) << 8 | \
(UINT8)((acc[2] + w2) / w) << 16 | (UINT8)((acc[3] + w2) / w) << 24
ImagingSectionEnter(&cookie);