Android Question (Solved) Camera2 - Preview frontal Camera - flip photo

[f0raster0]

Hey everyone,

When using frotal camare, where the image token changes in the preview.
Is there a way to maintain consistency with the image token throughout, without it flipping in the preview?

Camera2 lib:

Camera2 - Still images and videos

Camera2 library is based on the Camera2 API introduced in Android 5 (API 21). It is designed to work together with CamEx2 class. It is supported by B4A v7.3+. The library will be included as an internal library in the next update. Both image capturing and video recording are supported. CamEx2...

www.b4x.com

Mediachooser works if I change the settings in the phone, but my app is already using camera2, and before start changing things,

Is it possible to prevent the preview image from flipping using Camera2?

 

[Erel]

The front camera preview behaves like a mirror. This is the same as the default behavior of the camera app.

You can flip the preview panel by adding this line to CreateSurface:

tv.As(JavaObject).RunMethod("setScaleX", Array((-1).As(Float)))

 

[f0raster0]

thanks

Adding this line doesn't flip the preview image:

tv.As(JavaObject).RunMethod("setScaleX", Array((-1).As(Float)))

But it flips the view in the camare when taking the selfie.

When I try MediaChooser, it works as expected:

• The camera view is not flipped when taking the selfie.
• After the photo is taken, the preview remains unflipped.

I want to achieve the same behavior using the Camera2 library, if posible


Edit:

The front camera preview behaves like a mirror. This is the same as the default behavior of the camera app.

yes, i want like that. It works correctly there using the camera app or when using MediaChooser. However, when using the Camera2 library example, and if added that line above doens't flip the preview, but the image now gets flipped before taking the picture - it should behaves like a mirror and don't flip the preview

 

[Erel]

The standard behavior should be:
- Preview looks like a mirror (preview = not talking about the PreviewTaken event).
- Once the image is taken, the image is no longer mirrored.

You can test it by shooting something with text. The text will appear flipped in the preview and straight once the image is taken.

 

[f0raster0]

The standard behavior should be:
- Preview looks like a mirror (preview = not talking about the PreviewTaken event).
- Once the image is taken, the image is no longer mirrored.

Yes, it is like that when using camera2 lib.

The default camera of the phone save the selfie as they appear in the preview (it also happen like that when using Mediachooser lib)

But when using camera2 lib it save the selfie flipped.

Can camera2 lib take the selfie like a mirrow and save it like a mirrow, without flip it?

 

[Erel]

You will need to flip the image yourself. You can do it with BitmapCreatorEffects.

 

[f0raster0]

You will need to flip the image yourself. You can do it with BitmapCreatorEffects.

ok, thanks

The app now works as expected with the following behavior:

• The camera preview is mirrored by default.
• Once an image is taken, it keeps the mirrored effect, just like in the phone's default camera app.

Private Sub B4XPage_Created (Root1 As B4XView)
.....
    frontCamera = True 'open defaul frontal camera
    OpenCamera(frontCamera)    
End Sub

Private Sub TakePicture
    Try
        SetState(openstate, True, VideoMode)
        Wait For(cam.FocusAndTakePicture(MyTaskIndex)) Complete (Data() As Byte)
        SetState(openstate, False, VideoMode)
        cam.DataToFile(Data, VideoFileDir, "1.jpg")
        
        Dim bmp As Bitmap = cam.DataToBitmap(Data)
        Log("test Picture taken: " & bmp)

        Dim flippedBmp As Bitmap = FlipBitmapHorizontally(bmp) 'flip the image
        If flippedBmp.IsInitialized Then
            Log("test: Show the flipped image")
            pnlBackground.SetVisibleAnimated(100, True)
            B4XImageView1.Bitmap = flippedBmp

            Log("test: Refresh the image view ")
            Sleep(4000)
            pnlBackground.SetVisibleAnimated(500, False)
        Else
            Log("Flipped image was not generated successfully")
        End If

    Catch
        HandleError(LastException)
    End Try
End Sub


Private Sub FlipBitmapHorizontally(bmp As Bitmap) As Bitmap
    Dim bc As BitmapCreator
    bc.Initialize(bmp.Width, bmp.Height)
    For i = 0 To bmp.Height - 1
        For j = 0 To bmp.Width - 1
            Dim pixelColor As Int = bmp.GetPixel(j, i)
            bc.SetColor(bmp.Width - j - 1, i, pixelColor) ' Flip horizontally
        Next
    Next
    Return bc.Bitmap
End Sub