786282 - B2G: Displayport prediction kind of sucks

Status: RESOLVED DUPLICATE of bug 786267

(Core :: Graphics: Layers, defect)

Description

[Doug Sherk (:drs) (inactive)]

With the friction changes landed recently, the displayport prediction which used to handle decently seems to be much crappier. Here's a rough outline of what I think is needed:

1) A larger painted area, with a general preference for the y-axis instead of the x-axis.
2) While accelerating, setting the displayport further ahead than we actually are. 3) Perhaps not immediately discarding areas that have been painted when we're just moving slightly away from them (so circular motions won't cause checkerboarding all over the page).

I'll probably come up with more things.

Comment 1

[Doug Sherk (:drs) (inactive)]

I ended up folding this into the low-res patch. It's hard to separate them, but everything I said here ended up being implemented there except 3.