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Fix a few bugs in blur implementation

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This commit is contained in:
Kristian Høgsberg 2010-06-15 16:18:58 -04:00
parent 80d746f6e3
commit 49e868cb05
2 changed files with 6 additions and 21 deletions
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10
cairo-util.c
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@ -37,7 +37,7 @@ blur_surface(cairo_surface_t *surface, int margin)
uint8_t *src, *dst;
uint32_t *s, *d, a, p;
int i, j, k, size, half;
uint8_t kernel[35];
uint32_t kernel[49];
double f;
size = ARRAY_LENGTH(kernel);
@ -49,11 +49,9 @@ blur_surface(cairo_surface_t *surface, int margin)
dst = malloc(height * stride);
half = size / 2;
a = 0;
for (i = 0; i < size; i++) {
f = (i - half);
kernel[i] = exp(- f * f / 30.0) * 80;
a += kernel[i];
kernel[i] = exp(- f * f / ARRAY_LENGTH(kernel)) * 10000;
}
for (i = 0; i < height; i++) {
@ -69,6 +67,7 @@ blur_surface(cairo_surface_t *surface, int margin)
y = 0;
z = 0;
w = 0;
a = 0;
for (k = 0; k < size; k++) {
if (j - half + k < 0 || j - half + k >= width)
continue;
@ -78,6 +77,7 @@ blur_surface(cairo_surface_t *surface, int margin)
y += ((p >> 16) & 0xff) * kernel[k];
z += ((p >> 8) & 0xff) * kernel[k];
w += (p & 0xff) * kernel[k];
a += kernel[k];
}
d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
}
@ -96,6 +96,7 @@ blur_surface(cairo_surface_t *surface, int margin)
y = 0;
z = 0;
w = 0;
a = 0;
for (k = 0; k < size; k++) {
if (i - half + k < 0 || i - half + k >= height)
continue;
@ -106,6 +107,7 @@ blur_surface(cairo_surface_t *surface, int margin)
y += ((p >> 16) & 0xff) * kernel[k];
z += ((p >> 8) & 0xff) * kernel[k];
w += (p & 0xff) * kernel[k];
a += kernel[k];
}
d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
}

17
cairo-util.h
View file

@ -23,23 +23,6 @@
#ifndef _CAIRO_UTIL_H
#define _CAIRO_UTIL_H
struct buffer {
int width, height, stride;
uint32_t name, handle;
};
struct buffer *
buffer_create(int fd, int width, int height, int stride);
int
buffer_destroy(struct buffer *buffer, int fd);
int
buffer_data(struct buffer *buffer, int fd, void *data);
struct buffer *
buffer_create_from_cairo_surface(int fd, cairo_surface_t *surface);
void
blur_surface(cairo_surface_t *surface, int margin);