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Drive-by optimization of blur_surface()

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This commit is contained in:
Kristian Høgsberg 2011-01-21 22:19:40 -05:00
parent a495333d4f
commit 0cd8f6eded
1 changed files with 2 additions and 4 deletions
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6
clients/cairo-util.c
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@ -49,9 +49,11 @@ blur_surface(cairo_surface_t *surface, int margin)
dst = malloc(height * stride); dst = malloc(height * stride);
half = size / 2; half = size / 2;
a = 0;
for (i = 0; i < size; i++) { for (i = 0; i < size; i++) {
f = (i - half); f = (i - half);
kernel[i] = exp(- f * f / ARRAY_LENGTH(kernel)) * 10000; kernel[i] = exp(- f * f / ARRAY_LENGTH(kernel)) * 10000;
a += kernel[i];
} }
for (i = 0; i < height; i++) { for (i = 0; i < height; i++) {
@ -67,7 +69,6 @@ blur_surface(cairo_surface_t *surface, int margin)
y = 0; y = 0;
z = 0; z = 0;
w = 0; w = 0;
a = 0;
for (k = 0; k < size; k++) { for (k = 0; k < size; k++) {
if (j - half + k < 0 || j - half + k >= width) if (j - half + k < 0 || j - half + k >= width)
continue; continue;
@ -77,7 +78,6 @@ blur_surface(cairo_surface_t *surface, int margin)
y += ((p >> 16) & 0xff) * kernel[k]; y += ((p >> 16) & 0xff) * kernel[k];
z += ((p >> 8) & 0xff) * kernel[k]; z += ((p >> 8) & 0xff) * kernel[k];
w += (p & 0xff) * kernel[k]; w += (p & 0xff) * kernel[k];
a += kernel[k];
} }
d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a; d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
} }
@ -96,7 +96,6 @@ blur_surface(cairo_surface_t *surface, int margin)
y = 0; y = 0;
z = 0; z = 0;
w = 0; w = 0;
a = 0;
for (k = 0; k < size; k++) { for (k = 0; k < size; k++) {
if (i - half + k < 0 || i - half + k >= height) if (i - half + k < 0 || i - half + k >= height)
continue; continue;
@ -107,7 +106,6 @@ blur_surface(cairo_surface_t *surface, int margin)
y += ((p >> 16) & 0xff) * kernel[k]; y += ((p >> 16) & 0xff) * kernel[k];
z += ((p >> 8) & 0xff) * kernel[k]; z += ((p >> 8) & 0xff) * kernel[k];
w += (p & 0xff) * kernel[k]; w += (p & 0xff) * kernel[k];
a += kernel[k];
} }
d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a; d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
} }