[gtk+] cairoblur: Fix the blur code

[Jasper St. Pierre <jstpierre src gnome org>]

commit ac9ac555551be0a607ad7b76531c2f80ea76d349
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Oct 27 10:05:35 2014 -0700

    cairoblur: Fix the blur code
    
    We weren't passing in the right "d" value, which was causing the blur to
    behave incorrectly, especially in the case of 1px blurs, which would
    cause no blurs at all.
    
    The blur should now match the web.

 gtk/gtkcairoblur.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkcairoblur.c b/gtk/gtkcairoblur.c
index b3f14db..4e03a7f 100644
--- a/gtk/gtkcairoblur.c
+++ b/gtk/gtkcairoblur.c
@@ -147,6 +147,7 @@ _boxblur (guchar  *buffer,
           int      radius)
 {
   guchar *flipped_buffer;
+  int d = _gtk_cairo_blur_compute_pixels (radius);
 
   flipped_buffer = g_malloc (width * height);
 
@@ -154,13 +155,13 @@ _boxblur (guchar  *buffer,
   flip_buffer (flipped_buffer, buffer, width, height);
 
   /* Step 2: blur rows (really columns) */
-  blur_rows (flipped_buffer, buffer, height, width, radius);
+  blur_rows (flipped_buffer, buffer, height, width, d);
 
   /* Step 3: swap rows and columns */
   flip_buffer (buffer, flipped_buffer, height, width);
 
   /* Step 4: blur rows */
-  blur_rows (buffer, flipped_buffer, width, height, radius);
+  blur_rows (buffer, flipped_buffer, width, height, d);
 
   g_free (flipped_buffer);
 }