private void Test()
{
MFVideoAlphaBitmap ab = new MFVideoAlphaBitmap();
MFVideoAlphaBitmapParams abp = new MFVideoAlphaBitmapParams();
MFVideoAlphaBitmapParams abp2 = new MFVideoAlphaBitmapParams();
Bitmap bm = new Bitmap(@"C:\Windows\Web\Wallpaper\Windows\img0.jpg");
Graphics g = Graphics.FromImage(bm);
ab.GetBitmapFromDC = true;
ab.stru = g.GetHdc();
ab.paras = new MFVideoAlphaBitmapParams();
ab.paras.dwFlags = MFVideoAlphaBitmapFlags.Alpha | MFVideoAlphaBitmapFlags.DestRect;
ab.paras.fAlpha = 0.5f;
ab.paras.nrcDest = new MFVideoNormalizedRect(0.5f, 0.5f, 1.0f, 1.0f);
ab.paras.rcSrc = new MFRect(0, 0, bm.Width, bm.Height);
int hr = m_vmb.SetAlphaBitmap(ab);
MFError.ThrowExceptionForHR(hr);
hr = m_vmb.GetAlphaBitmapParameters(abp);
MFError.ThrowExceptionForHR(hr);
// According the the docs, the graph must be running in order to call update
hr = ((IMediaControl)m_pGraph).Run();
MFError.ThrowExceptionForHR(hr);
System.Threading.Thread.Sleep(1000);
abp.fAlpha = .6f;
abp.dwFlags |= MFVideoAlphaBitmapFlags.Alpha;
hr = m_vmb.UpdateAlphaBitmapParameters(abp);
MFError.ThrowExceptionForHR(hr);
hr = m_vmb.GetAlphaBitmapParameters(abp2);
MFError.ThrowExceptionForHR(hr);
hr = m_vmb.ClearAlphaBitmap();
MFError.ThrowExceptionForHR(hr);
}
private void menuItem14_Click(object sender, EventArgs e)
{
MFVideoAlphaBitmap alphaBmp = new MFVideoAlphaBitmap();
using (Bitmap alphaBitmap = new Bitmap("epsonproj.png"))
{
//alphaBitmap is a 32bit semitransparent Bitmap
Graphics g = Graphics.FromImage(alphaBitmap);
// get pointer to needed objects
IntPtr hdc = g.GetHdc();
IntPtr memDC = CreateCompatibleDC(hdc);
IntPtr hBitmap = alphaBitmap.GetHbitmap();
IntPtr hOld = SelectObject(memDC, hBitmap);
alphaBmp.GetBitmapFromDC = true;
alphaBmp.stru = memDC;
alphaBmp.paras = new MFVideoAlphaBitmapParams();
alphaBmp.paras.dwFlags = MFVideoAlphaBitmapFlags.Alpha | MFVideoAlphaBitmapFlags.DestRect;
// calculate destination rectangle
MFVideoNormalizedRect mfNRect = new MFVideoNormalizedRect();
//NormalizedRect nRect = GetDestRectangle(width, height, subtitleLines);
mfNRect.top = 0.5f;// nRect.top;
mfNRect.left = 0.5f;// nRect.left;
mfNRect.right = 1.0f;//nRect.right;
mfNRect.bottom = 1.0f;// nRect.bottom;
// used when viewing half side by side anaglyph video that is stretched to full width
//if (FrameMode == Mars.FrameMode.HalfSideBySide)
//{
// mfNRect.left /= 2;
// mfNRect.right /= 2;
//}
alphaBmp.paras.nrcDest = mfNRect;
// calculate source rectangle (full subtitle bitmap)
MFRect rcSrc = new MFRect();
rcSrc.bottom = alphaBitmap.Height;
rcSrc.right = alphaBitmap.Width;
rcSrc.top = 0;
rcSrc.left = 0;
alphaBmp.paras.rcSrc = rcSrc;
// apply 1-bit transparency
//System.Drawing.Color colorKey = System.Drawing.Color.White;
//alphaBmp.paras.clrSrcKey = ColorTranslator.ToWin32(colorKey);
// 90% visible
alphaBmp.paras.fAlpha = 0.5F;
// set the bitmap to the evr mixer
mixBmp.SetAlphaBitmap(alphaBmp);
// cleanup
SelectObject(memDC, hOld);
DeleteDC(memDC);
g.ReleaseHdc();
}
}
