function recompute()

in seriously.js [6267:6330]
57 lines of code
22 McCabe index (conditional complexity)

		function recompute() {
			var matrix = me.matrix,
				width = forceWidth || me.width,
				height = forceHeight || me.height,
				scaleX,
				scaleY,
				source = me.source,
				sourceWidth = source && source.width || 1,
				sourceHeight = source && source.height || 1,
				aspectIn,
				aspectOut;

			if (mode === 'distort' || width === sourceWidth && height === sourceHeight) {
				me.transformed = false;
				return;
			}

			aspectIn = sourceWidth / sourceHeight;

			aspectOut = width / height;

			if (mode === 'none') {
				scaleX = sourceWidth / width;
				scaleY = sourceHeight / height;
			} else if (mode === 'width' || mode === 'contain' && aspectOut <= aspectIn) {
				scaleX = 1;
				scaleY = aspectOut / aspectIn;
			} else if (mode === 'height' || mode === 'contain' && aspectOut > aspectIn) {
				scaleX = aspectIn / aspectOut;
				scaleY = 1;
			} else {
				//mode === 'cover'
				if (aspectOut > aspectIn) {
					scaleX = 1;
					scaleY = aspectOut / aspectIn;
				} else {
					scaleX = aspectIn / aspectOut;
					scaleY = 1;
				}
			}

			if (scaleX === 1 && scaleY === 1) {
				me.transformed = false;
				return;
			}

			//calculate transformation matrix
			mat4.identity(matrix);

			//scale
			if (scaleX !== 1) {
				matrix[0] *= scaleX;
				matrix[1] *= scaleX;
				matrix[2] *= scaleX;
				matrix[3] *= scaleX;
			}
			if (scaleY !== 1) {
				matrix[4] *= scaleY;
				matrix[5] *= scaleY;
				matrix[6] *= scaleY;
				matrix[7] *= scaleY;
			}
			me.transformed = true;
		}