internal virtual void GetCoordRects(out Rectangle rcSrcRoot, out Rectangle rcDstRoot)
{
Point Dpi = m_site.Dpi;
rcSrcRoot = Rectangle.FromLTRB(0, 0, Dpi.X, Dpi.Y);
int dxdScrollOffset;
int dydScrollOffset;
m_site.GetScrollOffsets(out dxdScrollOffset, out dydScrollOffset);
rcDstRoot = new Rectangle(-dxdScrollOffset + m_site.HorizMargin, -dydScrollOffset,
Dpi.X, Dpi.Y);
}