/// <summary>
/// Creates a Snapshot from a windowless control
/// </summary>
/// <param name="control">control that is being drawn to by the VMR9</param>
public Snapshot(IVMRWindowlessControl9 control)
{
int hr;
hr = control.GetCurrentImage(out _dib);
DsError.ThrowExceptionForHR(hr);
}
public void VideoWindowSnapshot(IVMRFilterConfig9 renderer)
{
if (null == VmrRenderer)
{
return;
}
IVMRWindowlessControl9 ctrl = (IVMRWindowlessControl9)renderer;
IntPtr imgptr = IntPtr.Zero;
Bitmap bmp = null;
try
{
ctrl.GetCurrentImage(out imgptr);
if (IntPtr.Zero != imgptr)
{
BitmapInfoHeader header = new BitmapInfoHeader();
Marshal.PtrToStructure(imgptr, header);
//stride formula comes from MSDN
//https://docs.microsoft.com/en-us/windows/win32/api/wingdi/ns-wingdi-bitmapinfoheader
var stride = ((((header.Width * header.BitCount) + 31) & ~31) >> 3);
//暫時假定輸出圖像是純DIB沒有Color Mask等額外資訊
bmp = new Bitmap(header.Width, header.Height, stride,
PixelFormat.Format32bppArgb, imgptr + header.Size);
//注意這邊撈出的CurrentImage，是上下顛倒狀態(沿著X軸鏡射)
//要把它再鏡射回來才能存檔
bmp.RotateFlip(RotateFlipType.RotateNoneFlipY);
SaveFileDialog dlg = new SaveFileDialog();
dlg.Filter = "Bitmap File (*.bmp)|*.bmp";
dlg.InitialDirectory = BinPath;
if (dlg.ShowDialog() == DialogResult.OK)
{
bmp.Save(dlg.FileName, ImageFormat.Jpeg);
}
}
}
catch (Exception ex)
{
MessageBox.Show("Failed to save snapshot bmp file : " + ex.Message);
}
finally
{
if (bmp != null)
{
bmp.Dispose();
}
if (IntPtr.Zero != imgptr)
{
Marshal.FreeCoTaskMem(imgptr);
}
}
}
public override bool GetCurrentImage(out BITMAPINFOHEADER header, out IntPtr dibFull, out IntPtr dibDataOnly)
{
int hr = _pVMRWindowlessControl9.GetCurrentImage(out dibFull);
if (DsHlp.SUCCEEDED(hr))
{
header = (BITMAPINFOHEADER)Marshal.PtrToStructure(dibFull, typeof(BITMAPINFOHEADER));
dibDataOnly = new IntPtr(dibFull.ToInt64() + Marshal.SizeOf(typeof(BITMAPINFOHEADER)));
return(true);
}
else
{
header = new BITMAPINFOHEADER();
dibDataOnly = IntPtr.Zero;
return(false);
}
}
private void snapImage()
{
if (windowlessCtrl != null)
{
IntPtr currentImage = IntPtr.Zero;
Bitmap bmp = null;
try
{
int hr = windowlessCtrl.GetCurrentImage(out currentImage);
DsError.ThrowExceptionForHR(hr);
if (currentImage != IntPtr.Zero)
{
BitmapInfoHeader structure = new BitmapInfoHeader();
Marshal.PtrToStructure(currentImage, structure);
bmp = new Bitmap(structure.Width, structure.Height, (structure.BitCount / 8) * structure.Width, System.Drawing.Imaging.PixelFormat.Format32bppArgb, new IntPtr(currentImage.ToInt64() + 40));
bmp.RotateFlip(RotateFlipType.RotateNoneFlipY);
if (saveFileDialog.ShowDialog() == DialogResult.OK)
{
bmp.Save(saveFileDialog.FileName.ToString(), System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
}
catch (Exception anyException)
{
MessageBox.Show("Failed getting image: " + anyException.Message);
}
finally
{
if (bmp != null)
{
bmp.Dispose();
}
Marshal.FreeCoTaskMem(currentImage);
}
}
}
