[Webkit-unassigned] [Bug 275803] New: [TexMap][Nicosia] Correctly gather damage information for 3D-transformed layers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=275803

            Bug ID: 275803
           Summary: [TexMap][Nicosia] Correctly gather damage information
                    for 3D-transformed layers
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aperez at igalia.com
                CC: simon.fraser at apple.com

As part of the work in bug #265777 we introduced a mechanism that tries
to skip computing damage regions for 3D-transformed layers and, if one
such layer is detected, invalidate the complete frame. See function
layerRendererStyleHas3DTransformOperation() in RenderLayerBacking.cpp,
and its callsite in RenderLayerBacking::updateAfterDescendants().

This mechanism does not always work as intended, and for example artifacts
can still be seen in https://people.igalia.com/aperez/poster-circle.html
which means the layerRendererStyleHas3DTransformOperation() check is not
completely correct.

Ideally, we would prefer this check to be removed and regions properly
calculated. Otherwise, we should at least make the check work as
intended.

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