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A weston_surface is transformed to multi screen coordinate, global coordinate by matrix:m now. Additionally, a mask needs to be calucated, taking account into, - multi screen coordination: a destination rectangle of layer in the coordination is easily calcurated by adding weston_output.{x,y} in simple. This is because there is no scaled and rotated transformation. - intersect inside of a screen the layer is assigned to. This is because overlapped region of weston surface in another screen shall not be displayed according to ivi use case. Signed-off-by: Nobuhiko Tanibata <nobuhiko_tanibata@xddp.denso.co.jp> Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
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