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When _cogl_add_path_to_stencil_buffer is used to draw a path we don't need to clear the entire stencil buffer. Instead it can clear just the bounding box of the path. This adds an extra parameter called 'need_clear' which is only set if the stencil buffer is being used for clipping. http://bugzilla.openedhand.com/show_bug.cgi?id=1829