[Traverso-devel] Buffering AudioClipView painting

[ben levitt]

I've been thinking that we could reduce cpu/gpu work while dragging a
clip, by painting the contents of AudioClipViews to a QPixmap, and on
each call to AudioClipView::paint(), reusing the part of the previous
pixmap that was visible, and still is visible.

We'd have to watch out for things that change a clip's appearance like
changing the soft-selected state, and then repaint the whole pixmap.

But then the performance while dragging a clip should be similar to
while scrolling.

Remon, what do you think?

Ben