[Webkit-unassigned] [Bug 201706] New: [FTW] Improve Bitmap handling performance

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=201706

            Bug ID: 201706
           Summary: [FTW] Improve Bitmap handling performance
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

The ImageBufferData implementation does complicated copying of data from GPU ID2D1Bitmap -> CPU ID2D1Bitmap1 and back when the render targets are not compatible.

But Direct2D already has a mechanism for sharing between multiple render targets on the same device. This patch makes the following changes:

1. If the render target requested when drawing does not match the target used to create the bitmap, use the CreateSharedBitmap API to create a new bitmap that shares GPU memory with the original bitmap.
2. Since all of our rendering is to an IDXGISurface1, don't bother creating an HWND-backed temporary surface (since it has to be moved to the DXGI surface anyway). Start with the IDXGISurface as the backing store.

These changes improve motion mark from 98.07 -> 120.66.

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