Index: layersel/layersel.c
===================================================================
--- layersel/layersel.c	(revision 8484)
+++ layersel/layersel.c	(revision 8485)
@@ -64,6 +64,47 @@
 	return image;
 }
 
+static
+GtkWidget *test_pixbuf_pixel_manipulated()
+{
+	GdkPixbuf *pixbuf;
+	GtkWidget *image;
+	gint width, height;
+	guchar *pixels;
+	guint32 color = 0x00ff00ff;		/* Green */
+	guint r, g, b, a;
+	guint w, h;
+	guchar *p;
+
+	pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, TRUE, 8, 16, 16);
+	width = gdk_pixbuf_get_width(pixbuf);	/* 16 here, obviously */
+	height = gdk_pixbuf_get_height(pixbuf);
+	pixels = gdk_pixbuf_get_pixels(pixbuf);
+	/* Fill the whole rectangle with color */
+	r = (color & 0xff000000) >> 24;
+	g = (color & 0x00ff0000) >> 16;
+	b = (color & 0x0000ff00) >> 8;
+	a = (color & 0x000000ff);
+
+	while (height--) {
+		w = width;
+		p = pixels;
+		while (w--) {
+			p[0] = r;
+			p[1] = g;
+			p[2] = b;
+			p[3] = a;
+			p += 4;
+		}
+		pixels += gdk_pixbuf_get_rowstride(pixbuf);
+	}
+
+	image = gtk_image_new_from_pixbuf(pixbuf);
+	g_object_unref(pixbuf);
+
+	return image;
+}
+
 /** Main widget building function */
 GtkWidget *pcb_gtk_layersel_build(GtkWidget * mainwin)
 {
@@ -76,6 +117,9 @@
 	gtk_box_pack_start(GTK_BOX(box), label, FALSE, FALSE, 0);
 	image = test_gdk_pixbuf_fill();
 	gtk_box_pack_start(GTK_BOX(box), image, FALSE, FALSE, 0);
+	gtk_box_pack_start(GTK_BOX(box), gtk_vseparator_new(), FALSE, FALSE, 2);
+	image = test_pixbuf_pixel_manipulated();
+	gtk_box_pack_start(GTK_BOX(box), image, FALSE, FALSE, 0);
 
 	gtk_container_add(GTK_CONTAINER(mainwin), box);
 	gtk_widget_show_all(mainwin);