Merge branch 'GeoRefImprove'

[andy/viking.git] / src / ui_util.c

diff --git a/src/ui_util.c b/src/ui_util.c
index 13e9764dfc682f48e4fa19b556d70bbd8b5fe494..1d526aae6e45840f03de02076c8474a26590a2f5 100644 (file)
--- a/src/ui_util.c
+++ b/src/ui_util.c
@@ -168,3 +168,33 @@ GtkWidget *ui_lookup_widget(GtkWidget *widget, const gchar *widget_name)
                g_warning("Widget not found: %s", widget_name);
        return found_widget;
 }
+
+/**
+ * Apply the alpha value to the specified pixbuf
+ */
+GdkPixbuf *ui_pixbuf_set_alpha ( GdkPixbuf *pixbuf, guint8 alpha )
+{
+  guchar *pixels;
+  gint width, height, iii, jjj;
+
+  if ( ! gdk_pixbuf_get_has_alpha ( pixbuf ) )
+  {
+    GdkPixbuf *tmp = gdk_pixbuf_add_alpha(pixbuf,FALSE,0,0,0);
+    g_object_unref(G_OBJECT(pixbuf));
+    pixbuf = tmp;
+    if ( !pixbuf )
+      return NULL;
+  }
+
+  pixels = gdk_pixbuf_get_pixels(pixbuf);
+  width = gdk_pixbuf_get_width(pixbuf);
+  height = gdk_pixbuf_get_height(pixbuf);
+
+  /* r,g,b,a,r,g,b,a.... */
+  for (iii = 0; iii < width; iii++) for (jjj = 0; jjj < height; jjj++)
+  {
+    pixels += 3;
+    *pixels++ = alpha;
+  }
+  return pixbuf;
+}