/**
* fill the the preparedBufferMap instance with int[] buffers for all screens.
*/
public synchronized void prepareOutputBuffer() {
int[] buffer;
Visual v;
for (int screen = 0; screen < this.collector.getNrOfScreens(); screen++) {
LayoutModel lm = this.layout.getDataForScreen(screen, Collector.getInstance().getAllOutputMappings());
OutputMapping map = this.collector.getOutputMappings(screen);
v = this.collector.getVisual(lm.getVisualId());