Extract rect calculation
Extract rect calculation

LarissaSmith/openseadragon,Iced-Tea/openseadragon,seanich/openseadragon,rdlester/openseadragon,jmnetus/openseadragon,TMUND/openseadragon,seanich/openseadragon,jmnetus/openseadragon,avandecreme/openseadragon,mcanthony/openseadragon,ricochet2200/openseadragon,rdlester/openseadragon,mcanthony/openseadragon,goofwear/openseadragon,daverome/openseadragon,goofwear/openseadragon,openseadragon/openseadragon,shaunstanislaus/openseadragon,avandecreme/openseadragon,lidasong2014/openseadragon,LarissaSmith/openseadragon,ricochet2200/openseadragon,shaunstanislaus/openseadragon,daverome/openseadragon,msalsbery/openseadragon,msalsbery/openseadragon,openseadragon/openseadragon,lidasong2014/openseadragon,TMUND/openseadragon,Iced-Tea/openseadragon