Rotation on image from CameraView

Question

How can I rotate the image (is byte[]) captured by CamerView (Xamarin Community Toolkit) since rotation doesn't have a setter?

Answer 1

Hello AndreaFarina-0549,​

Welcome to our Microsoft Q&A platform!

since rotation doesn't have a setter

The CamearView class inherits from View class, and View class inherits from VisualElement class. The Rotation property is provided by the VisualElement class, the property has set and get method. You could change the value of the Rotation property to rotate the image captured by the CameraView control directly.

Here is the related doc about the Rotation property:
https://learn.microsoft.com/en-us/dotnet/api/xamarin.forms.visualelement.rotationproperty?view=xamarin-forms

Best Regards,

Jarvan Zhang

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Answer 2

Unfortunately I had already tried these solutions. I would like to avoid native platforms. And using SkiaSharp when I convert SKBitmap back to bytes[] has not undergone any rotation. But I need a byte[].

Answer 3

And using SkiaSharp when I convert SKBitmap back to bytes[] has not undergone any rotation. But I need a byte[].

@Andrea Farina Try to get the stream for the ImageSource and then use SKBitmap.Decode(stream) command to generate a SKBitmap iobject.

Here is the related code, you could refer to it:

   private void CameraView_MediaCaptured(object sender, Xamarin.CommunityToolkit.UI.Views.MediaCapturedEventArgs e)  
   {  
       StreamImageSource streamImageSource = (StreamImageSource)e.Image;  
       System.Threading.CancellationToken cancellationToken = System.Threading.CancellationToken.None;  
       Task<Stream> task = streamImageSource.Stream(cancellationToken);  
       Stream stream = task.Result;  
     
       SKBitmap photo = RotateBitmap(SKBitmap.Decode(stream));  
       img.Source = ImageSource.FromStream(() => SKImage.FromBitmap(photo).Encode().AsStream());  
   }  
     
   SKBitmap RotateBitmap(SKBitmap bitmap)  
   {  
       SKBitmap rotatedBitmap = new SKBitmap(bitmap.Height, bitmap.Width);  
       using (var surface = new SKCanvas(rotatedBitmap))  
       {  
           surface.Translate(rotatedBitmap.Width, 0);  
           surface.RotateDegrees(90);  
           surface.DrawBitmap(bitmap, 0, 0);  
       }  
       return rotatedBitmap;  
   }  

Answer 4

Answer 5