[Webkit-unassigned] [Bug 83190] New: Shadows clipped on composited layers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=83190

           Summary: Shadows clipped on composited layers
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: vangelis at chromium.org
                CC: simon.fraser at apple.com, enne at google.com


This bug was originally reported in:
http://code.google.com/p/chromium/issues/detail?id=121102

Composited layers seem to clip out shadow region corresponding to a -webkit-box-shadow property. Steps to reproduce:

(WebKit in 10.7 with accelerated canvas or Chrome)

1. Open http://www.tsetmc.com/Loader.aspx?ParTree=151311&i=23441366113375722
2. Click 's' to open the popup div with the box shadow 
3. Resize the main window until the popup overlaps the graph at the top left

At that point, the popup gets promoted to a composited layer and loses it shadow (and a chunk of its border). The composited layer borders reveal that the layer created is really too small.

An alternative way to trigger the bug on the same page is to simply add a -webkit-transform: translateZ(0) on the popup div's content.

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