Drive-by optimization of blur_surface()
diff --git a/clients/cairo-util.c b/clients/cairo-util.c
index 3aef0af..5aa9857 100644
--- a/clients/cairo-util.c
+++ b/clients/cairo-util.c
@@ -49,9 +49,11 @@
dst = malloc(height * stride);
half = size / 2;
+ a = 0;
for (i = 0; i < size; i++) {
f = (i - half);
kernel[i] = exp(- f * f / ARRAY_LENGTH(kernel)) * 10000;
+ a += kernel[i];
}
for (i = 0; i < height; i++) {
@@ -67,7 +69,6 @@
y = 0;
z = 0;
w = 0;
- a = 0;
for (k = 0; k < size; k++) {
if (j - half + k < 0 || j - half + k >= width)
continue;
@@ -77,7 +78,6 @@
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;
}
@@ -96,7 +96,6 @@
y = 0;
z = 0;
w = 0;
- a = 0;
for (k = 0; k < size; k++) {
if (i - half + k < 0 || i - half + k >= height)
continue;
@@ -107,7 +106,6 @@
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;
}