Optimize blur a bit more.

cairo-util.c

@@ -100,6 +100,8 @@ buffer_create_from_cairo_surface(int fd, cairo_surface_t *surface)
 	return buffer;
 }
 
+#define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
+
 void
 blur_surface(cairo_surface_t *surface, int margin)
 {
@@ -107,10 +109,11 @@ blur_surface(cairo_surface_t *surface, int margin)
 	int32_t width, height, stride, x, y, z, w;
 	uint8_t *src, *dst;
 	uint32_t *s, *d, a, p;
-	int i, j, k, size = 17, half;
-	uint8_t kernel[100];
+	int i, j, k, size, half;
+	uint8_t kernel[10];
 	double f;
 
+	size = ARRAY_LENGTH(kernel);
 	width = cairo_image_surface_get_width(surface);
 	height = cairo_image_surface_get_height(surface);
 	stride = cairo_image_surface_get_stride(surface);
@@ -131,9 +134,11 @@ blur_surface(cairo_surface_t *surface, int margin)
 		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)
+			if (margin < j && j < width - margin) {
+				d[j] = s[j];
 				continue;
+			}
+
 			x = 0;
 			y = 0;
 			z = 0;
@@ -156,9 +161,11 @@ blur_surface(cairo_surface_t *surface, int margin)
 		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)
+			if (margin <= i && i < height - margin) {
+				d[j] = s[j];
 				continue;
+			}
+
 			x = 0;
 			y = 0;
 			z = 0;

window.c

@@ -88,7 +88,7 @@ draw_window(void *data)
 	cairo_set_source_rgba(cr, 0, 0, 0, 0.5);
 	rounded_rect(cr, 0, 0, window->width, window->height, radius);
 	cairo_fill(cr);
-	blur_surface(surface, 16 + radius);
+	blur_surface(surface, 24 + radius);
 
 	cairo_translate(cr, -5, -3);
 	cairo_set_line_width (cr, border);
@@ -148,7 +148,6 @@ draw_window(void *data)
 	cairo_set_source_rgb(cr, 1, 1, 1);
 	cairo_fill(cr);
 	cairo_destroy(cr);
-
 	if (window->buffer != NULL)
 		buffer_destroy(window->buffer, window->fd);
 	buffer = buffer_create_from_cairo_surface(window->fd, surface);
@@ -381,7 +380,7 @@ int main(int argc, char *argv[])
 
 	wl_display_set_event_handler(display, event_handler, window);
 
-	g_timeout_add(20, draw, window);
+	g_timeout_add(50, draw, window);
 
 	g_main_loop_run(loop);