Convert RenderTargetBitmap to BitmapImage

Question

I have a RenderTargetBitmap, I need to convert it to BitmapImage. Please check the code below.

 RenderTargetBitmap bitMap = getRenderTargetBitmap();
 Image image = new Image();// This is a Image
 image.Source = bitMap;

In the above code I have used Image.Now I need to use a BitmapImage. How can I do this?

 RenderTargetBitmap bitMap = getRenderTargetBitmap();
 BitmapImage image = new BitmapImage();// This is a BitmapImage
 // how to set bitMap as source of BitmapImage ?

Dowsabel

Georges,I need to convert the RenderTargetBitmap to BitmapImage. – Dowsabel

Possible duplicate: RenderTargetBitmap to BitmapImage in WPF – Rectum

something like that : msdn.microsoft.com/en-us/library/aa969819.aspx – Estrella

Please explain why exactly you need to have a BitmapImage? RenderTargetBitmap and BitmapImage have a common base class BitmapSource, which provides all the basic bitmap properties. – Ellisellison

MSDN: "BitmapImage primarily exists to support Extensible Application Markup Language (XAML) syntax and introduces additional properties for bitmap loading that are not defined by BitmapSource.". Do you really need that? – Ellisellison

The questioner doesn't mention it, but you cannot set RenderTargetBitmap.Rotation but you can set BitmapImage.Rotation. – Voice

Answer 1

Although it doesn't seem to be necessary to convert a RenderTargetBitmap into a BitmapImage, you could easily encode the RenderTargetBitmap into a MemoryStream and decode the BitmapImage from that stream.

There are several BitmapEncoders in WPF, the sample code below uses a PngBitmapEncoder.

var renderTargetBitmap = getRenderTargetBitmap();
var bitmapImage = new BitmapImage();
var bitmapEncoder = new PngBitmapEncoder();
bitmapEncoder.Frames.Add(BitmapFrame.Create(renderTargetBitmap));

using (var stream = new MemoryStream())
{
    bitmapEncoder.Save(stream);
    stream.Seek(0, SeekOrigin.Begin);

    bitmapImage.BeginInit();
    bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
    bitmapImage.StreamSource = stream;
    bitmapImage.EndInit();
}

Ellisellison

Answer 2

private async void Button_Click(object sender, RoutedEventArgs e)
{
    RenderTargetBitmap bitMap = new RenderTargetBitmap();
    await bitMap.RenderAsync(grid);
    Image image = new Image();// This is a Image
    image.Source = bitMap;
    image.Height = 150;
    image.Width = 100;

    grid.Children.Add(image);
}

This looks as a simpler solution.

Are

Please answer in English and ask questions as separate questions (or via comments when you have enough reputation) – Soda

This isn't even a solution at all (despite a simpler one), because it does not create a BitmapImage, as was asked for in the question. – Ellisellison