/// <summary>
/// Deaktiviert die Bildüberlagerung.
/// </summary>
public void ClearOverlayBitmap()
{
// Create structure
var param = new VMRAlphaBitmap { Flags = VMRAlphaBitmapFlags.Disable };
// Forward
using (var vmr = VMR.MarshalToManaged())
((IVMRMixerBitmap) vmr.Object).SetAlphaBitmap( ref param );
}
/// <summary>
/// Aktiviert die Bildüberlagerung.
/// </summary>
/// <param name="bitmap">Die gewünschte Überlagerung.</param>
/// <param name="left">Die linke Seite.</param>
/// <param name="top">Die obere Seite.</param>
/// <param name="right">Die rechte Seite.</param>
/// <param name="bottom">Die untere Seite.</param>
/// <param name="alpha">Der Transparenzfaktor.</param>
/// <param name="sourceColor">Optional der Transparenzschlüssel.</param>
public void SetOverlayBitmap( Bitmap bitmap, double left, double top, double right, double bottom, double alpha, Color? sourceColor )
{
// Attach to video window device context
using (var self = Graphics.FromHwnd( m_VideoWindow.Handle ))
{
// Get the device context
IntPtr originalHDC = self.GetHdc();
try
{
// Create the HDC
IntPtr compat = CreateCompatibleDC( originalHDC );
try
{
// Create the memory device context
using (var inMem = Graphics.FromHdc( compat ))
{
// Get the device context
IntPtr memoryHDC = inMem.GetHdc();
try
{
// Get the bitmap
IntPtr bmp = bitmap.GetHbitmap();
try
{
// Select the bitmap into it
IntPtr prev = SelectObject( memoryHDC, bmp );
try
{
// Create structure
var param =
new VMRAlphaBitmap
{
Target = { Left = (float) left, Top = (float) top, Bottom = (float) bottom, Right = (float) right, },
Source = { Right = bitmap.Width, Bottom = bitmap.Height },
Flags = VMRAlphaBitmapFlags.DeviceHandle,
DeviceHandle = memoryHDC,
Alpha = (float) alpha,
};
// Set the source color
if (sourceColor.HasValue)
{
// Finish
param.Flags |= VMRAlphaBitmapFlags.SourceColorKey;
param.SourceColorKey = (uint) sourceColor.Value.ToArgb();
}
// Activate
using (var vmr = VMR.MarshalToManaged())
((IVMRMixerBitmap) vmr.Object).SetAlphaBitmap( ref param );
}
finally
{
// Restore
SelectObject( memoryHDC, prev );
}
}
finally
{
// Cleanup
DeleteObject( bmp );
}
}
finally
{
// Release resources
inMem.ReleaseHdc();
}
}
}
finally
{
// Release HDC
DeleteDC( compat );
}
}
finally
{
// Release resources
self.ReleaseHdc();
}
}
}
