[Webkit-unassigned] [Bug 234290] New: Remove GraphicsLayerCA specific TiledBacking virtual functions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234290

            Bug ID: 234290
           Summary: Remove GraphicsLayerCA specific TiledBacking virtual
                    functions
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Hironori.Fujii at sony.com
                CC: simon.fraser at apple.com

Remove GraphicsLayerCA specific TiledBacking virtual functions

I'm going to implement TiledBacking subclass for WinCairo (Bug 233676).
TiledBacking has a lot of GraphicsLayerCA specific virtual functions.
Let's remove them.

Covariant return type will help to do that.

https://en.wikipedia.org/wiki/Covariant_return_type
https://en.cppreference.com/w/cpp/language/virtual

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