[ros-dev] Patch up for testing

[Hartmut Birr]

Ge van Geldorp wrote:

>The only issue I know of is that this patch will cause increased display
>corruption when using the Cirrus driver in QEmu. I believe this is only a
>symptom of a deeper problem we have with the Cirrus driver.
>  
>

It seems that some source objects (bitmaps or memory dcs)  are created
with negative size values. Our own bitblt-functions check the clipping
region and does discard such sources. The cirrus driver doesn't do this.

- Hartmut