[WinCairo] Repaint issues with accelerated compositing.

• Component: WebKit Misc.
• Status: RESOLVED FIXED

There are some repaint issues in accelerated compositing mode, for example on www.ddg.gg.

Created attachment 240062 [details]
Patch

[Brent Fulgham]

Comment on attachment 240062 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=240062&action=review

I think this looks fine, but I can't confirm isAcceleratedCompositing at the moment. can you confirm and then I can approve the patch?

> Source/WebKit/win/WebView.cpp:6796
> +    if (!isAcceleratedCompositing())

I don't have WebKit source in front of me. Can you confirm 'isAcceleratedCompositing' is identical to checking m_backingLayer for USE(CA)?

(In reply to comment #2)
> Comment on attachment 240062 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=240062&action=review
> 

Thanks for reviewing :)

> I think this looks fine, but I can't confirm isAcceleratedCompositing at the
> moment. can you confirm and then I can approve the patch?
> 
> > Source/WebKit/win/WebView.cpp:6796
> > +    if (!isAcceleratedCompositing())
> 
> I don't have WebKit source in front of me. Can you confirm
> 'isAcceleratedCompositing' is identical to checking m_backingLayer for
> USE(CA)?

Yes, when m_backingLayer is created, m_isAcceleratedCompositing is set to true, and when m_backingLayer is set to null, m_isAcceleratedCompositing is set to false.

[Alex Christensen]

Comment on attachment 240062 [details]
Patch

This also seems to fix a drawing issue that appeared sometimes during transitions in http://www.w3.org/Talks/2012/0416-CSS-WWW2012/Demos/transitions/demo-transitions-3-shadows.html

[WebKit Commit Bot]

Comment on attachment 240062 [details]
Patch

Clearing flags on attachment: 240062

Committed r174865: <http://trac.webkit.org/changeset/174865>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.