[Webkit-unassigned] [Bug 142783] RenderLayerCompositor: only create backing for visible and non-empty layers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=142783

--- Comment #21 from Julien Isorce <j.isorce at samsung.com> ---
I checked an indeed a backingstore is created only when CoordinatedGraphicsScene/layerShouldHaveBackingStore 
"drawsContent() && contentsAreVisible() && !size().isEmpty()" return true.

At each call to CoordinatedGraphicsScene::setLayerState it checks if this condition return false to see if it can remove the backingstore.

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