using raster for gl device
fix top-y overflow for raster
rename the raster
reduce the edges make for raster
impl polygon cutter contours
impl and debuging polygon cutter
debuging the polygon cutter
reimpl the polygon cutter
fix the polygon cutter bug for reallocing the active contours
rename some variables for the polygon cutter
optimizate the polygon raster and fix points bug for cutter
fix the join bug for the polygon cutter