1101813 - Incredibly slow animation produces unexpected rendering position

Status: RESOLVED INCOMPLETE

(Core :: Graphics, defect)

Description

[/\/\arcio Galli]

I am starting with a use case/user story – but I might be able to produce a simplified testcase as soon as first need is clear. 

The case is: 

* You have, let's say, scale and rotation 3d; for a DIV with text or image. Then you use, for duration, something like 100 seconds — so to expect something very very slow, therefore expecting a lot of "frames" to be produced. What I mean by frames is updates in the screen. 

Problem: 

So far  I see, in Linux, the zoom/scale effect to have miscalculations — it is positioned clearly outside the shortest path to a (interpolation) target. Let's say that frame 1 is positioned X,y and frame 3 to be positioned at X' Y' — the frame 2 is slightly outside what human eye would expect as interpolation. 

In other words, 

When you record screen and animated quickly it becomes all shaky. 

m

Comment 1

[/\/\arcio Galli]

Sorry it's a quick time video mp4 taken from PNG screen shots: 

http://www.mgalli.com/development/out-bug.mp4

Notice the "graphic logo" near the center of the screen, it's supposed to be super smooth — go frame by frame and you will see how it sort of goes to random direction among frames.

Comment 2

[/\/\arcio Galli]

BTW the problem only happens when 3d transform is present.

Comment 3

[Markus Stange [:mstange]]

Can you check whether this still happens after bug 1097776?

Comment 4

[Wayne Mery (:wsmwk)]

/\/\arcio ?

(In reply to Markus Stange [:mstange] from comment #3)
> Can you check whether this still happens after bug 1097776? [which was fixed]

Comment 5

[Phoenix]

Resolved per whiteboard