[Webkit-unassigned] [Bug 36947] New: Transparent Background of Silverlight Apps lead to black backgrounds and repainting errors

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=36947

           Summary: Transparent Background of Silverlight Apps lead to
                    black backgrounds and repainting errors
           Product: WebKit
           Version: 525.x (Safari 3.2)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Blocker
          Priority: P2
         Component: Plug-ins
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: freitagwargestern at gmx.de


Created an attachment (id=52280)
 --> (https://bugs.webkit.org/attachment.cgi?id=52280)
Sample-screenshot and Silverlight Demo App

Szenario:
Having a Silverlight Application with WindowlessMode = true and a transparent
Background, the App will strech all over the screen(this detail is not
important for this bug). 
The effect should be, that html liying under Silverlight will be shown through
the transparent parts of Silverlight.

When executing such configuration in Gecko-Based Browsers or the IE, everything
works fine. With Webkit, Background remains black (not the Background of the
SL-App, nor the Background of the html) - just a black color from the rendering
pipeline and when dragging a Silverlight element around the screen, no
redrawing is done, the older positions if this element will be shown to. -
Until a general redrawing is triggered, like a window resize.

In the appending Archive, you can find a screenshot visualizing this effect and
a small Silverlight Demo for confirming.
What this app does:
- A blue background-image defined in html
- A nearly complete transparent silverlight Application, stretching all over
the html
- A draggable circle, initialized in the middle

Hint:
In the newest Chrome Source(not the currently release) was a Bugfix for this
issue. Maybe this can help you finding the corresponding sources.

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