public void TestSetAlphaBitmap()
{
int hr = 0;
// GDI Stuff
IntPtr hdc = g.GetHdc();
IntPtr memDC = CreateCompatibleDC(hdc);
IntPtr hBirmap = bmp.GetHbitmap();
SelectObject(memDC, hBirmap);
alphaBitmap = new VMR9AlphaBitmap();
alphaBitmap.dwFlags = VMR9AlphaBitmapFlags.hDC | VMR9AlphaBitmapFlags.SrcColorKey | VMR9AlphaBitmapFlags.FilterMode;
alphaBitmap.hdc = memDC;
alphaBitmap.pDDS = IntPtr.Zero;
alphaBitmap.fAlpha = 0.5f;
alphaBitmap.rSrc = new DsRect(0, 0, 255, 255); // SetAlphaBitmap only accept the full size
alphaBitmap.rDest = new NormalizedRect(0.0f, 0.0f, 1.0f, 1.0f);
alphaBitmap.clrSrcKey = ColorTranslator.ToWin32(colorKey);
alphaBitmap.dwFilterMode = VMRMixerPrefs.BiLinearFiltering;
hr = mixerBitmap.SetAlphaBitmap(ref alphaBitmap);
DsError.ThrowExceptionForHR(hr);
DeleteObject(hBirmap);
DeleteDC(memDC);
g.ReleaseHdc(hdc);
Debug.Assert(hr == 0, "IVMRMixerBitmap9.SetAlphaBitmap");
}
private void SetMixerSettings()
{
int hr = 0;
VMR9AlphaBitmap alphaBmp;
if (!mixerEnabled) // Did the user disable the bitmap ?
{
// Get current Alpha Bitmap Parameters
hr = mixerBitmap.GetAlphaBitmapParameters(out alphaBmp);
DsError.ThrowExceptionForHR(hr);
// Disable them
alphaBmp.dwFlags = VMR9AlphaBitmapFlags.Disable;
// Update the Alpha Bitmap Parameters
hr = mixerBitmap.UpdateAlphaBitmapParameters(ref alphaBmp);
DsError.ThrowExceptionForHR(hr);
return;
}
if (usingGDI)
{
// Old school GDI stuff...
Graphics g = Graphics.FromImage(colorKeyBitmap);
IntPtr hdc = g.GetHdc();
IntPtr memDC = NativeMethodes.CreateCompatibleDC(hdc);
IntPtr hBitmap = colorKeyBitmap.GetHbitmap();
NativeMethodes.SelectObject(memDC, hBitmap);
// Set Alpha Bitmap Parameters for using a GDI DC
alphaBmp = new VMR9AlphaBitmap();
alphaBmp.dwFlags = VMR9AlphaBitmapFlags.hDC | VMR9AlphaBitmapFlags.SrcColorKey | VMR9AlphaBitmapFlags.FilterMode;
alphaBmp.hdc = memDC;
alphaBmp.rSrc = new DsRect(0, 0, colorKeyBitmap.Size.Width, colorKeyBitmap.Size.Height);
alphaBmp.rDest = GetDestRectangle();
alphaBmp.clrSrcKey = ColorTranslator.ToWin32(colorKey);
alphaBmp.dwFilterMode = VMRMixerPrefs.PointFiltering;
alphaBmp.fAlpha = 0.75f;
// Set Alpha Bitmap Parameters
hr = mixerBitmap.SetAlphaBitmap(ref alphaBmp);
DsError.ThrowExceptionForHR(hr);
// Release GDI handles
NativeMethodes.DeleteObject(hBitmap);
NativeMethodes.DeleteDC(memDC);
g.ReleaseHdc(hdc);
g.Dispose();
}
else // Using a Direct3D surface
{
// Set Alpha Bitmap Parameters for using a Direct3D surface
alphaBmp = new VMR9AlphaBitmap();
alphaBmp.dwFlags = VMR9AlphaBitmapFlags.EntireDDS;
alphaBmp.pDDS = unmanagedSurface;
alphaBmp.rDest = GetDestRectangle();
alphaBmp.fAlpha = 1.0f;
// Note : Alpha values from the bitmap are cumulative with the fAlpha parameter.
// Example : texel alpha = 128 (50%) & fAlpha = 0.5f (50%) = effective alpha : 64 (25%)
// Set Alpha Bitmap Parameters
hr = mixerBitmap.SetAlphaBitmap(ref alphaBmp);
DsError.ThrowExceptionForHR(hr);
}
}
