[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 #5 from peavo at outlook.com ---
(In reply to comment #2)
> Comment on attachment 259171 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=259171&action=review
> 

Thanks for reviewing :)

> does this fix pages like acko.net ?
> 

Yes, I believe so.

> > 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?

The translate will center the view.

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