Chris Jones [:cjones] inactive; ni?/f?/r? if you need me Reporter
	Description • 12 years ago

Currently we try to maintain an always-valid back buffer.  The code to do this has gotten much too complex, and sometimes this isn't the right thing to do: if we invalidate almost the entire buffer for a repaint, then the front->back copy is just wasted memory traffic.

What we should do instead is wait until ThebesLayerBuffer has computed the area we need to repaint, then apply some simple heuristics to decide whether the front->back copy will save any work.