Method makeMask

ij/src/main/java/ij/plugin/filter/Filler.java:226–236

(ImageProcessor ip, Rectangle r)

	}

	public void makeMask(ImageProcessor ip, Rectangle r) {
 		mask = ip.getMask();
 		if (mask==null) {
 			mask = new ByteProcessor(r.width, r.height);
 			mask.invert();
 		} else {
 			// duplicate mask (needed because getMask caches masks)
 			mask = mask.duplicate();
 		}
 		mask.invert();
 	}

}