[CSS Regions] Reduce the RenderRegion invasiveness in rendering code

[Andrei Bucur]

During the layout of the flow threads, they are cached to prevent slow tree walks. We can apply the same technique at paint time as well.

[Andrei Bucur]

Created attachment 231511 [details]
WIP

[Andrei Bucur]

Created attachment 231513 [details]
Patch

[Andrei Bucur]

Created attachment 231514 [details]
Patch with fixed typo

[Antti Koivisto]

Comment on attachment 231514 [details]
Patch with fixed typo

View in context: https://bugs.webkit.org/attachment.cgi?id=231514&action=review

r=me

> Source/WebCore/rendering/RenderLayer.cpp:4475
> +        PaintInfo paintInfo(context, fragment.foregroundRect.rect(), phase, paintBehavior, subtreePaintRootForRenderer, 0, 0, &localPaintingInfo.rootLayer->renderer());

You could also turn 0's into nullptrs here and various other places since you are touching them.

> Source/WebCore/rendering/RenderLayer.h:713
> +    bool intersectsDamageRect(const LayoutRect& layerBounds, const LayoutRect& damageRect, const RenderLayer* rootLayer, const LayoutPoint* offsetFromRoot = 0, const LayoutRect* cachedBoundingBox = 0) const;

nullptr

> Source/WebCore/rendering/RenderLayer.h:963
> +        LayerPaintingInfo(RenderLayer* inRootLayer, const LayoutRect& inDirtyRect, PaintBehavior inPaintBehavior, const LayoutSize& inSubPixelAccumulation, RenderObject* inSubtreePaintRoot = 0, OverlapTestRequestMap* inOverlapTestRequests = 0)

nullptr

[Andrei Bucur]

Created attachment 231520 [details]
Patch for landing

[Andrei Bucur]

Created attachment 231521 [details]
Patch for landing v2

[WebKit Commit Bot]

Comment on attachment 231521 [details]
Patch for landing v2

Clearing flags on attachment: 231521

Committed r168899: <http://trac.webkit.org/changeset/168899>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[WebKit Commit Bot]

Re-opened since this is blocked by bug 132965

[Andrei Bucur]

Created attachment 231569 [details]
Patch v2

[Andrei Bucur]

Comment on attachment 231569 [details]
Patch v2

The difference between this patch and the one previously landed is the commented ASSERT inside RenderObject::currentRenderNamedFlowFragment().

Because compositing is not yet fully integrated with regions there are calls to the function during layout (so the current flow thread is set) to determine the ancestor clipping rectangle of a layer. There's a FIXME in RenderLayerCompositor that the code doesn't work with regions because we don't know the containing region at that point. Once we fix that we can re-enable the assert.

[WebKit Commit Bot]

Comment on attachment 231569 [details]
Patch v2

Clearing flags on attachment: 231569

Committed r168967: <http://trac.webkit.org/changeset/168967>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.