[OpenJDK 2D-Dev] XShmGetImage with image's > drawable's size causes BadMatch

[Clemens Eisserer]

Hi,

I've recently encountered some BadMatch errors  triggered by fallbacks.
Those are caused by reading outside of surface bounds using the cached
ShmPixmap.

Testcase and patch attached.

Running with -Dsun.awt.noisyerrorhandler=True the testcase causes a BadMatch:
> Xerror BadMatch (invalid parameter attributes), XID 5000017, ser# 215
> Major opcode 139  //SHM
> Minor opcode 4      //GetImage

If a X11SDOps structure belongs to a pixmap I can directly use
pmWidth/Height, but for windows I have to query the attributes
width/height.
Is there a better way to get window's width/height, maybe through some
of AWT's structures?

- Clemens
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