Fixed *some* gui drawing speed issues.

1 files changed, 7 insertions, 0 deletions

diff --git a/muse2/muse/mixer/meter.cpp b/muse2/muse/mixer/meter.cpp
index f50aa261..eb214e77 100644
--- a/muse2/muse/mixer/meter.cpp
+++ b/muse2/muse/mixer/meter.cpp
@@ -24,6 +24,13 @@
 Meter::Meter(QWidget* parent, MeterType type)
    : QFrame(parent) //Qt::WNoAutoErase
       {
+      setBackgroundRole(QPalette::NoRole);
+      setAttribute(Qt::WA_NoSystemBackground);
+      setAttribute(Qt::WA_StaticContents);
+      // This is absolutely required for speed! Otherwise painfully slow because we get 
+      //  full rect paint events even on small scrolls! See help on QPainter::scroll().
+      setAttribute(Qt::WA_OpaquePaintEvent);
+      
       mtype = type;
       overflow    = false;
       val         = 0.0;