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Derek Foreman authored
We've been setting up the viewport by moving the start pointer of the draw buffer, but later when we want to post damage in buffer co-ordinates we'll need to keep track of the x,y offsets anyway. Signed-off-by: Derek Foreman <derekf@osg.samsung.com> Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
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