1 files changed, 37 insertions, 0 deletions
diff --git a/src/gcompris/pixbuf_util.c b/src/gcompris/pixbuf_util.c
index 8b38a96..62cc6ca 100644
--- a/src/gcompris/pixbuf_util.c
+++ b/src/gcompris/pixbuf_util.c
@@ -83,3 +83,40 @@ GdkPixbuf *pixbuf_copy_mirror(GdkPixbuf *src, gint mirror, gint flip)
 	return dest;
 }
 
+
+
+/* Copyright 2006 Miguel DE IZARRA 
+ * Base on function gdk_pixbuf_fill from gdk_pixbuf
+ */
+void pixbuf_add_transparent (GdkPixbuf *pixbuf,guint alpha)
+{
+        guchar *pixels;
+        guchar *p;
+        guint w, h;
+
+        g_return_if_fail (GDK_IS_PIXBUF (pixbuf));
+        g_return_if_fail(gdk_pixbuf_get_has_alpha(pixbuf));
+        
+        if (gdk_pixbuf_get_width(pixbuf) == 0 || gdk_pixbuf_get_height(pixbuf) == 0)
+                return;
+
+        pixels = gdk_pixbuf_get_pixels(pixbuf);
+
+        h = gdk_pixbuf_get_height(pixbuf);
+        
+        while (h--) {
+                w = gdk_pixbuf_get_width(pixbuf);
+                p = pixels;
+
+                while (w--) {
+                    if(p[3] > alpha)
+                        p[3] = p[3] - alpha;
+                    else
+                        p[3] = 0;
+                    p += 4;
+                }
+
+                pixels += gdk_pixbuf_get_rowstride(pixbuf);
+        }
+}
+