# HG changeset patch
# User Chris Cannam
# Date 1409741623 -3600
# Node ID 99f96cacde36dbcfbbe8d81c2032ebd56b6f17a8
# Parent  6c6e34b096887aa27caf6ec80606f31b7263812a
Fix some potential divide by zeros (from coverity scan)

diff -r 6c6e34b09688 -r 99f96cacde36 layer/WaveformLayer.cpp
--- a/layer/WaveformLayer.cpp	Wed Sep 03 11:51:51 2014 +0100
+++ b/layer/WaveformLayer.cpp	Wed Sep 03 11:53:43 2014 +0100
@@ -46,7 +46,8 @@
     m_middleLineHeight(0.5),
     m_aggressive(false),
     m_cache(0),
-    m_cacheValid(false)
+    m_cacheValid(false),
+    m_cacheZoomLevel(0)
 {
     
 }
@@ -1042,7 +1043,7 @@
 
     channels = getChannelArrangement(minChannel, maxChannel,
                                      mergingChannels, mixingChannels);
-
+    if (channels == 0) return 0;
     if (maxChannel < minChannel || channel < minChannel) return 0;
 
     int h = v->height();
@@ -1085,7 +1086,7 @@
 
     channels = getChannelArrangement(minChannel, maxChannel,
                                      mergingChannels, mixingChannels);
-
+    if (channels == 0) return 0;
     if (maxChannel < minChannel) return 0;
 
     int h = v->height();