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

--- color-quant.cc.orig	1996-02-16 03:21:16.000000000 +0000
+++ color-quant.cc
@@ -85,14 +85,17 @@ class QuantWindowRenderer : public Pseud
 public:
 	QuantWindowRenderer(VideoWindow* vw, int decimation, QuantColorModel& cm) :
 		PseudoWindowRenderer(vw, decimation, cm.graylut()),
-		cm_(cm) { }
+		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:
 	QuantColorModel& cm_;
 	virtual void update();
-	virtual void disable() { method_ = PseudoWindowRenderer::dither_null; }
+	virtual void disable() { method_ = NULL; }
 	QuantMethod method_;
 	void map_422(const u_char* frm, u_int off, u_int x,
 		     u_int width, u_int height) const;