/// <summary>
/// Helper used by BeginDraw. This checks the graphics device status,
/// making sure it is big enough for drawing the current control, and
/// that the device is not lost. Returns an error string if the device
/// could not be reset.
/// </summary>
protected string HandleDeviceReset()
{
bool deviceNeedsReset;
switch (GraphicsDevice.GraphicsDeviceStatus)
{
case GraphicsDeviceStatus.Lost:
// If the graphics device is lost, we cannot use it at all.
return("Graphics device lost");
case GraphicsDeviceStatus.NotReset:
// If device is in the not-reset state, we should try to reset it.
deviceNeedsReset = true;
break;
default:
// If the device state is ok, check whether it is big enough.
PresentationParameters pp = GraphicsDevice.PresentationParameters;
deviceNeedsReset = (ClientSize.Width > pp.BackBufferWidth) || (ClientSize.Height > pp.BackBufferHeight);
break;
}
// Do we need to reset the device?
if (deviceNeedsReset)
{
try {
mGraphicsDeviceService.ResetDevice(ClientSize.Width, ClientSize.Height);
} catch (Exception e) {
return("Graphics device reset failed\n\n" + e);
}
}
return(null);
}
