[CSS Regions] Overflow above the first region is not properly painted for regions with padding

• Component: CSS
• Status: RESOLVED FIXED

[Radu Stavila]

[CSS Regions] Overflow above the first region is not properly painted for regions with padding

[Radu Stavila]

Created attachment 223833 [details]
Patch

[Andrei Bucur]

Comment on attachment 223833 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=223833&action=review

> Source/WebCore/ChangeLog:10
> +        anonymous regions, regions never have borders/padding/margins. All of these are found 

The CL should emphasize the technical problem is we use the layer of the region container (with a coordinate system) but we offset the content using the location of the region. If the anonymous region had a layer and we used that instead of the region container layer, there wouldn't have been any problems. It's less important the fact anonymous regions don't have borders/padding/margins.

> Source/WebCore/rendering/RenderLayer.cpp:5250
> +    LayoutRect regionContentBox = region->regionContainer()->contentBoxRect();

mapLayerClipRectsToFragmentationLayer can take just RenderNamedFlowThreadFragments as a parameter or generic RenderRegions?

> Source/WebCore/rendering/RenderRegion.cpp:153
> +RenderBlockFlow* RenderRegion::regionContainer() const

Can we move this on RenderNamedFlowFragment? It makes more sense considering we assert the parent is a RenderNamedFlowFragmentContainer.

[Radu Stavila]

Comment on attachment 223833 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=223833&action=review

>> Source/WebCore/rendering/RenderLayer.cpp:5250
>> +    LayoutRect regionContentBox = region->regionContainer()->contentBoxRect();
> 
> mapLayerClipRectsToFragmentationLayer can take just RenderNamedFlowThreadFragments as a parameter or generic RenderRegions?

I'll create a new issue to use RenderNamedFlowFragment whenever possible instead of RenderRegion.

[Radu Stavila]

Created attachment 223849 [details]
Patch with update CL

[Andrei Bucur]

(In reply to comment #3)
> (From update of attachment 223833 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=223833&action=review
> 
> >> Source/WebCore/rendering/RenderLayer.cpp:5250
> >> +    LayoutRect regionContentBox = region->regionContainer()->contentBoxRect();
> > 
> > mapLayerClipRectsToFragmentationLayer can take just RenderNamedFlowThreadFragments as a parameter or generic RenderRegions?
> 
> I'll create a new issue to use RenderNamedFlowFragment whenever possible instead of RenderRegion.

Great!

[WebKit Commit Bot]

Comment on attachment 223849 [details]
Patch with update CL

Clearing flags on attachment: 223849

Committed r163873: <http://trac.webkit.org/changeset/163873>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.