status-notifier: Fix item icons transparency

1 files changed, 19 insertions, 0 deletions

diff --git a/applets/notification_area/status-notifier/sn-item-v0.c b/applets/notification_area/status-notifier/sn-item-v0.c
index 0ef0570a..0ab07ce4 100644
--- a/applets/notification_area/status-notifier/sn-item-v0.c
+++ b/applets/notification_area/status-notifier/sn-item-v0.c
@@ -344,6 +344,9 @@ surface_from_variant (GVariant *variant,
   cairo_format_t format;
   gint stride;
   guint32 *data;
+  gint x;
+  gint y;
+  guchar *p;
 
   format = CAIRO_FORMAT_ARGB32;
   stride = cairo_format_stride_for_width (format, width);
@@ -358,6 +361,22 @@ surface_from_variant (GVariant *variant,
   }
 #endif
 
+  p = (guchar *) data;
+  /* premultiply alpha for Cairo */
+  for (y = 0; y < height; y++)
+    {
+      for (x = 0; x < width; x++)
+        {
+          guchar alpha = p[x * 4 + 3];
+
+          p[x * 4 + 0] = (p[x * 4 + 0] * alpha) / 255;
+          p[x * 4 + 1] = (p[x * 4 + 1] * alpha) / 255;
+          p[x * 4 + 2] = (p[x * 4 + 2] * alpha) / 255;
+        }
+
+      p += stride;
+    }
+
   return cairo_image_surface_create_for_data ((guchar *) data, format,
                                               width, height, stride);
 }