[Webkit-unassigned] [Bug 101701] New: Coordinated Graphics: Amend CoordinatedBackingStore::paintToTextureMapper to fit its own semantic.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=101701

           Summary: Coordinated Graphics: Amend
                    CoordinatedBackingStore::paintToTextureMapper to fit
                    its own semantic.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: luxtella at company100.net


Currently, all subclasses of TextureMapperPlatformLayer implement
paintToTextureMapper to draw its own texture on the given targetRect. Subclasses
can scale the texture to fit the size of the targetRect. However, only
CoordinatedBackingStore::paintToTextureMapper draws its texture using its own
texture size. There is no bug yet, because TextureMapperLayer uses
CoordinatedBackingStore only as a backing store, not a content layer. So,
TextureMapperLayer always request CoordinatedBackingStore to draw using its own
texture size. However, we can use CoordinatedBackingStore as a content layer in
the future. So this patch fixes this potential bug.

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