[Webkit-unassigned] [Bug 71225] [chromium] when position:fixed in a separate layer it doesn't get full resolution with css transform

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=71225





--- Comment #6 from Hin-Chung Lam <hclam at google.com>  2011-11-02 13:57:13 PST ---
Created an attachment (id=113374)
 --> (https://bugs.webkit.org/attachment.cgi?id=113374&action=review)
work in progress 1

James: I also took your advice to look into how WebKit implements, please check the attached patch to see if this is the right approach to take. There are several things I don't understand so I added comments to the code:

1. GraphicsLayer::setAppliesPageScale() is called on GraphicsLayer associated to the render view. I don't know what this actually means because the layer transformation passed to the GraphicsLayer doesn't contain the scale transform. Actual painting of this layer goes through RenderLayer::paintLayer() which has transform applied to the painter.

2. It seems in RenderStlye::setPageScaleTransform() the page scale transform is applied as a CSS scale transform to be inherited by all objects. I observed that GraphicsLayer for render view doesn't have scale transform applied, but GraphicsLayer for position:fixed has scale transform applied. I had to counter-act this scale transform in GraphicsLayerChromium for position:fixed.... I'm sure there's a better way to do this..

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