CopyContents
fWindow->CopyContents(region, x, y);
fWindow->CopyContents(copyRegion, -x, -y);
fWindow->CopyContents(copyRegion, xOffset, yOffset);
void CopyContents(BRegion* region,
fWindow->CopyContents(©Region, x, y);
fWindow->CopyContents(©Region, -x, -y);
void CopyContents(BRegion* region,