--- a/src/sampler.cc	Tue May 06 09:39:58 2008 +0200
+++ b/src/sampler.cc	Thu May 08 09:21:25 2008 +0200
@@ -303,7 +303,7 @@
 	return true;
 }
 
-void DefaultSampler::saveSample(Sample &samp, Colour &col)
+void DefaultSampler::saveSample(const Sample &samp, const Colour &col)
 {
 	Float *buf = pixmap.getFloatData()
 		+ 3*(samp.sy * pixmap.getWidth() + samp.sx);