$NetBSD: patch-at,v 1.2 2006/02/27 15:49:56 joerg Exp $

--- color-hi.cc.orig	1996-05-16 12:42:44.000000000 +0000
+++ color-hi.cc
@@ -157,14 +157,17 @@ typedef void (HiWindowRenderer::*HiMetho
 class HiWindowRenderer : public WindowDitherer {
     public:
 	HiWindowRenderer(VideoWindow* vw, int decimation, HiColorModel& cm)
-		: WindowDitherer(vw, decimation), cm_(cm), method_(0){ }
+		: WindowDitherer(vw, decimation), cm_(cm), method_(NULL){ }
 	void render(const u_char* frm, int off, int x, int w, int h) {
-		(this->*method_)(frm, off, x, w, h);
+		if (this->method_)
+			(this->*method_)(frm, off, x, w, h);
+		else
+			dither_null(frm, off, x, w, h);
 	}
     protected:
 	HiColorModel& cm_;
 	virtual void update();
-	virtual void disable() { method_ = HiMethod(WindowRenderer::dither_null); }
+	virtual void disable() { method_ = NULL; }
 	HiMethod method_;
 	void map_422(const u_char* frm, u_int off, u_int x,
 		     u_int width, u_int height) const;