[Webkit-unassigned] [Bug 117772] New: [CSS Blending] Background blending is not performed beyond opaque background layers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=117772

           Summary: [CSS Blending] Background blending is not performed
                    beyond opaque background layers
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org


Consider merging https://chromium.googlesource.com/chromium/blink/+/e5c8e0d80e03728effad4a2708c5a6d4c8d394cc

If an element has the background defined as two opaque layers, let's say a jpg image
and a background color, and background blending is specified via CSS, the operation
isn't performed.

The fix consists of adding another condition in RenderBox::PaintFillLayers to shortcircuit
at the next background layer only if there's no blending operation applied to it.
Otherwise, the layer should be passed forward for painting.

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