[Webkit-unassigned] [Bug 108351] New: [CSS Shaders] Parse custom filter function with the at rule reference syntax

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=108351

           Summary: [CSS Shaders] Parse custom filter function with the at
                    rule reference syntax
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mvujovic at adobe.com
                CC: michelangelo at webkit.org, dino at apple.com,
                    achicu at adobe.com
            Blocks: 71392


The custom function syntax has changed in the spec. Instead of including all of the custom filter information inline, the custom function can now reference an @filter rule by name. The custom function can still accept a list of parameters.

The syntax is defined as the following, where IDENT is the name of the @filter rule:
filter: custom(IDENT [, <param>]*)

In practice, it can look like this:
filter: custom(page-curl, direction 90, amount 0.5);

Spec: https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#customident-ltparamgt

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