[Webkit-unassigned] [Bug 163898] New: [Win][Direct2D] Improve support for filters

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163898

            Bug ID: 163898
           Summary: [Win][Direct2D] Improve support for filters
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

Tests (like MotionMark) that use CSS filters and other effects currently fail under Direct2D on Windows because Direct2D expects certain operations (such as clipping) to only occur during drawing calls (i.e., inside a "BeginDraw", "EndDraw" pair).

This patch does the following:
1. Uses a smart pointer for Direct2D native path types to reduce memory leaks.
2. Adds a "BeginDraw" call in the Filter code at the start of filter drawing.
3. Adds an "EndDraw" call in the Filter code when drawing is finished.
4. Adds a new "temporaryBeginDrawIfNeeded" method to enter a draw operation if needed to execute the drawing commands needed during a filter or canvas drawing operation.
5. Improve performance by creating a single GDI Interop object for the Direct2D device instead of creating one every time a GDI drawing operation is needed.

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