Convert RenderTargetBitmap to Bitmap

Question

This looks like a dup question, it is, but no one has answered the actual question(s).

Here goes: Basically, I'm rendering a ViewPort3D as a 2D snapshot in code, but need to convert that type RenderTargetBitmap into the type System.Drawing.Bitmap (for further processing on the 2D side).

Dim bmpRen As New RenderTargetBitmap(1024, 550, 96, 96, PixelFormats.Pbgra32)
bmpRen.Render(Me.vp3dTiles) 'render the viewport as 2D snapshot

While I know how to save it to a file, I'd rather skip that step and convert the bmpRen to a System.Drawing.Bitmap type, but there is no method to do so.

Ypres

Don't use System.Drawing stuff in WPF. – Hyperspace

@FedericoBerasategui things such as tray icon still need GDI stuff for Win32 API. – Crypto

Answer 1

RenderedTargetBitmap is a BitmapSource, so the BmpBitmapEncoder can do the conversion for us:

This is in C#, but it should translate to VB without any problems.

RenderTargetBitmap bmpRen = new RenderTargetBitmap(1024, 550, 96, 96, PixelFormats.Pbgra32);
bmpRen.Render(vp3dTiles);

MemoryStream stream = new MemoryStream();
BitmapEncoder encoder = new BmpBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bmpRen));
encoder.Save(stream);

Bitmap bitmap = new Bitmap(stream);

Nadaba

Use PngBitmapEncoder with PixelFormats.Pbgra32 if you need alpha / transparency. – Crypto