[Webkit-unassigned] [Bug 215896] New: CSS Filter invert() and opacity() Implementation Should Use Linear Transfer Function for Clarity and Simplicity

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215896

            Bug ID: 215896
           Summary: CSS Filter invert() and opacity() Implementation
                    Should Use Linear Transfer Function for Clarity and
                    Simplicity
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: guowei_yang at apple.com

In WebKit's implementation of CSS filters invert() and opacity(), FEComponentTransfer is used and the transfer function is surprisingly to table, instead of linear. Looking at the CSS spec, https://drafts.fxtf.org/filter-effects/#invertEquivalent
invert() and opacity() is implemented using "table" with just 2 values, which is equivalent to using a linear function. I propose to change the implementation of invert() and opacity() to use linear transfer function as well for simplicity and clarity.

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