[Webkit-unassigned] [Bug 148085] [WinCairo] Accelerated compositing does not respect device scale factor.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=148085

--- Comment #2 from Alex Christensen <achristensen at apple.com> ---
Comment on attachment 259171
  --> https://bugs.webkit.org/attachment.cgi?id=259171
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=259171&action=review

does this fix pages like acko.net ?

> Source/WebKit/win/WebCoreSupport/AcceleratedCompositingContext.cpp:166
> +    TransformationMatrix m;
> +    m.scale(deviceScaleFactor());
> +    double tx = (size.width() - size.width() / deviceScaleFactor()) / 2.0;
> +    double ty = (size.height() - size.height() / deviceScaleFactor()) / 2.0;
> +    m.translate(tx, ty);

Why scale then translate?  Where does the 2.0 come from?

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