Optimize window blur calculation.
diff --git a/cairo-util.c b/cairo-util.c
index 4891f87..94c7b03 100644
--- a/cairo-util.c
+++ b/cairo-util.c
@@ -101,13 +101,13 @@
}
void
-blur_surface(cairo_surface_t *surface)
+blur_surface(cairo_surface_t *surface, int margin)
{
cairo_surface_t *tmp;
int32_t width, height, stride, x, y, z, w;
uint8_t *src, *dst;
uint32_t *s, *d, a, p;
- int i, j, k, size = 23, half;
+ int i, j, k, size = 17, half;
uint8_t kernel[100];
double f;
@@ -131,6 +131,9 @@
s = (uint32_t *) (src + i * stride);
d = (uint32_t *) (dst + i * stride);
for (j = 0; j < width; j++) {
+ if (margin < j && j < width - margin &&
+ margin < i && i < height - margin)
+ continue;
x = 0;
y = 0;
z = 0;
@@ -153,6 +156,9 @@
s = (uint32_t *) (dst + i * stride);
d = (uint32_t *) (src + i * stride);
for (j = 0; j < width; j++) {
+ if (margin <= j && j < width - margin &&
+ margin <= i && i < height - margin)
+ continue;
x = 0;
y = 0;
z = 0;