public void Dispose()
{
if (this.m_matrix != null)
{
if (!Win32.SetWorldTransform(this.m_hdc, ref this.m_oldXForm))
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
if (Win32.SetGraphicsMode(this.m_hdc, this.m_oldMode) == 0)
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
this.m_matrix.Dispose();
this.m_matrix = null;
}
if (!this.m_hdc.IsInvalid)
{
this.m_graphics.ReleaseHdc();
}
this.m_graphics.PageScale = this.m_pageScale;
this.m_graphics.PageUnit = this.m_pageUnits;
GC.SuppressFinalize(this);
}
private void SetupGraphics(float dpi)
{
this.m_graphics.PageUnit = GraphicsUnit.Pixel;
this.m_graphics.PageScale = 1f;
this.m_hdc = new Win32DCSafeHandle(this.m_graphics.GetHdc(), false);
this.m_oldXForm = default(Win32.XFORM);
if (this.m_matrix != null)
{
this.m_xForm = new Win32.XFORM(this.m_matrix, this.m_pageUnits, dpi);
this.m_oldMode = Win32.SetGraphicsMode(this.m_hdc, 2);
if (!Win32.GetWorldTransform(this.m_hdc, ref this.m_oldXForm))
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
if (!Win32.SetWorldTransform(this.m_hdc, ref this.m_xForm))
{
Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
}
}
else
{
this.m_xForm = Win32.XFORM.Identity;
}
}
