comparison layer/WaveformLayer.cpp @ 853:99f96cacde36

Fix some potential divide by zeros (from coverity scan)

     m_channel(-1),
     m_scale(LinearScale),
     m_middleLineHeight(0.5),
     m_aggressive(false),
     m_cache(0),
-    m_cacheValid(false)
+    m_cacheValid(false),
+    m_cacheZoomLevel(0)
 {
     
 }
 
 WaveformLayer::~WaveformLayer()

     int channels = 0, minChannel = 0, maxChannel = 0;
     bool mergingChannels = false, mixingChannels = false;
 
     channels = getChannelArrangement(minChannel, maxChannel,
                                      mergingChannels, mixingChannels);
-
+    if (channels == 0) return 0;
     if (maxChannel < minChannel || channel < minChannel) return 0;
 
     int h = v->height();
     int m = (h / channels) / 2;
 	

     int channels = 0, minChannel = 0, maxChannel = 0;
     bool mergingChannels = false, mixingChannels = false;
 
     channels = getChannelArrangement(minChannel, maxChannel,
                                      mergingChannels, mixingChannels);
-
+    if (channels == 0) return 0;
     if (maxChannel < minChannel) return 0;
 
     int h = v->height();
     int m = (h / channels) / 2;