1427899 - Handle blob invalidation of items with changing transforms better

Status: RESOLVED FIXED

(Core :: Graphics: WebRender, enhancement, P2)

Description

[Jeff Muizelaar [:jrmuizel]]

Imagine an otherwise unchanging display item that has an animated transform. We need to make sure that the attached BlobItemData::mRect gets properly adjusted for this new transform. We don't seem to have any mechanism to do this.

mstange, as I understand it children of nsDisplayTransform don't find out that the transform has changed. Correct?

Comment 1

[Jeff Muizelaar [:jrmuizel]]

One of the problems we have is finding out of a frame has had its transform change. Retained display lists sort of gives us this but it's maybe not the best approach.

Comment 2

[Jeff Muizelaar [:jrmuizel]]

It looks like the flags set by MarkNeedsDisplayItemRebuild() are cleared before we have a chance to use them.

Comment 3

[Jeff Muizelaar [:jrmuizel]]

Attachment: Handle changing transforms

Comment 4

[Markus Stange [:mstange]]

I think this bug is obsolete now / will be handled as part of bug 1388842.