Copy image with alpha channel to clipboard with custom background color?

Question

Code :

private void Foo(Canvas canvas)
{
    // The content is a bit larger...
    Size size = new Size(canvas.ActualWidth * 1.1, canvas.Act         


        

Answer 1

I have found a smaller and better-to-read solution, I found it at https://social.msdn.microsoft.com/Forums/vstudio/en-US/a6972b7f-5ccb-422d-b203-134ef9f10084/how-to-capture-entire-usercontrol-image-to-clipboard?forum=wpf :

// Create a render bitmap and push the surface to it
RenderTargetBitmap renderBitmap =
    new RenderTargetBitmap(
    (int)size.Width,
    (int)size.Height,
    96d,
    96d,
    PixelFormats.Pbgra32
);

// Render a white background into buffer for clipboard to avoid black background on some elements
Rectangle vRect = new Rectangle()
{
    Width = (int)size.Width,
    Height = (int)size.Height,
    Fill = Brushes.White,
};
vRect.Arrange(new Rect(size));
renderBitmap.Render(vRect);

// renderBitmap is now white, so render your object on it
renderBitmap.Render(surface);

// Copy it to clipboard
try
{
    Clipboard.SetImage(resultBitmap);
} catch { ... }