public abstract class DoubleBuffer {
/** Draw the region of source within (sx1, sy1, sx2, sy2) onto the region of this DoubleBuffer within (dx1, dy1, dx2, dy2), scaling as needed. */
public abstract class DoubleBuffer {
/** Draw the region of source within (sx1, sy1, sx2, sy2) onto the region of this DoubleBuffer within (dx1, dy1, dx2, dy2), scaling as needed. */