[Webkit-unassigned] [Bug 261856] New: [Filters] Filters with outsets have to repaint all the filterRegion if GraphicsStyles are used

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=261856

            Bug ID: 261856
           Summary: [Filters] Filters with outsets have to repaint all the
                    filterRegion if GraphicsStyles are used
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

The bounding box of a target element might all be clipped. But a filter effect, like drop shadow, may still be visible. In this case we need to redraw the whole filterRegion if GraphicsStyles are used.

This case can be seen in the test: imported/w3c/web-platform-tests/css/filter-effects/filters-drop-shadow-003.html. This test case has the bounding box of a target element outside the viewport but its shadow is displayed inside the viewport.

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