Reduce the refresh rate of the toolTipItem to 25fps.

This reduces a lot of CPU time and makes the overall use of the tooltip a
breeze.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/profile/divetooltipitem.cpp

@@ -159,6 +159,7 @@ ToolTipItem::ToolTipItem(QGraphicsItem *parent) : QGraphicsRectItem(parent),
 	title->setBrush(Qt::white);
 
 	setPen(QPen(Qt::white, 2));
+	refreshTime.start();
 }
 
 ToolTipItem::~ToolTipItem()
@@ -240,6 +241,10 @@ void ToolTipItem::refresh(const QPointF &pos)
 	static QPainter painter(&tissues);
 	static struct membuffer mb = { 0 };
 
+	if(refreshTime.elapsed() < 40)
+		return;
+	refreshTime.start();
+
 	int time = timeAxis->valueAt(pos);
 	if (time == lastTime)
 		return;

qt-ui/profile/divetooltipitem.h

@@ -6,6 +6,7 @@
 #include <QPair>
 #include <QRectF>
 #include <QIcon>
+#include <QTime>
 #include "display.h"
 
 class DiveCartesianAxis;
@@ -59,7 +60,7 @@ private:
 	DiveCartesianAxis *timeAxis;
 	plot_info pInfo;
 	int lastTime;
-
+	QTime refreshTime;
 	QList<QGraphicsItem*> oldSelection;
 };