Integral image

gistfile1.as

			var w:int = bitmapData.width, w1:int = w + 1, w2:int = w + 2, h:int = bitmapData.height, h1:int = h + 1, length:int = w1 * h1;
			
			var integralImage:Vector.<int> = new Vector.<int> (length, true);
			
			var vec:Vector.<uint> = bitmapData.getVector (bitmapData.rect);
			
			var i/*nput*/:int = 0, o/*utput*/:int = w2, s:int;
			for (var y:int = 0; y < h; y++, o++) {
				s = 0;
				for (var x:int = 0; x < w; x++, o++, i++) {
					// * iI[o-w1]
					// s iI[o]
					s += vec [i] & 255;
					integralImage [o] = integralImage[int (o - w1)] + s;
				}
			}

By "easier" I mean no if-s or 2nd loops. Agreed on "s" vs "[...]" part.