[Webkit-unassigned] [Bug 100718] Invalidate non-composited content host when page scale factor changes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=100718





--- Comment #4 from Tien-Ren Chen <trchen at chromium.org>  2012-10-29 18:59:58 PST ---
(In reply to comment #3)
> In Page::setPageScaleFactor() I see a setNeedsLayout(true) followed by a recalcStyle(Node::Force) - I would definitely expect this sequence to generate quite a few invalidations on the non composited content.

The RenderObject do generate a bunch of invalidation, but I doubt they're not redirected to the non-composited content layer (the contents are supposed to be on RenderView layer).

The only invalidation non-composited content layer gets is a rect of size of the CSS viewport, scaled by the page scale factor. I don't exactly know where does this rect come from, probably the size of RenderView(= size of CSS viewport), then wrongfully scaled with page scale factor. However even if it's correctly unscaled, it's still not suffice as the compositor can scroll the layer to expose the parts that are not repainted. We can observe that on the low-res preview when pinch zooming.

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