[Webkit-unassigned] [Bug 232457] New: [GPU Process] Make SVGFilter and CSSFilter work in the same coordinates system

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232457

            Bug ID: 232457
           Summary: [GPU Process] Make SVGFilter and CSSFilter work in the
                    same coordinates system
           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

Currently SVGFilter sets the following members of Filter

1. AffineTransform m_absoluteTransform: this is the scaling part from the transformation from the target element to the outermost coordinate system
2. FloatSize m_filterResolution: this is the clamping scale if the size of the result ImageBuffers exceeds MaxClampedArea

And the CSSFilter sets the following member of Filter:

1. float m_filterScale: this is the document().deviceScaleFactor()

The discrepancy happens also when creating the result ImageBuffers. For SVGFilter, we create them with scaleFactor=1. This means the logicalSize == backendSize. But for CSSFilter we create them with scaleFactor = m_filterScale. This means the logicalSize != backendSize in this case.

We need to unify the coordinates system for both filters. We need also to replace the three members by a single FloatSize called "m_filterScale".

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