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In single screen, the coordinates of layer local coordinates are the same as global coordinates. However, to support multi screens, the layer-local coordinates shall be transformed to multi screen coordinates, which is global coordinates. The abosolute coordinates of a screen in global stored in (x,y) of output of its weston output so it shall be used to transform layer-local to global coordinates. Signed-off-by: Nobuhiko Tanibata <nobuhiko_tanibata@xddp.denso.co.jp> Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
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