Update of bug #20287 (project mypaint):
Status: None => In Progress
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Follow-up Comment #2:
Yeah, that seems strange. Actually it's theoretically a little faster, but
maybe it's not noticable. CanvasRenderer.get_visible_layers() in
tileddrawwidget.py is doing its thing correctly: those layers aren't being
_rendered_ at all. They are having their bbox calculated in response to the
slider move for the purposes of the screen update, however: and that seems the
be where the problem lies.
Compositing happens in C, and only happens immediately for tiles which are
on-screen, or their mipmaps. It could easily be quicker than looping over 2000
or so tiles with a hash lookup each time.
Addressed in https://gitorious.org/mypaint/mypaint/commit/aed08632feecb, but
really it looks like this is a symptom of tiledsurface.get_tiles_bbox() being
slow for very large layers. I'm wondering if replacing our simple dict index
with something that knows about its bbox would generate some nice wins (even
if it's just a UI smoothness win!).
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