Question/Suggestion - freeze frame preview on demand

What are you trying to achieve or the steps to reproduce?

After taking the picture I'm doing some bitmap manipulation (merging with other bitmaps) on the fly, because of that I wanted to freeze preview during capture so the user can see what more or less the result will look like, but cannot find a way to do it correctly.

Looking at your api only thing that comes to my mind is to attach frame processor and get frame when I'm calling take picture and display it on overlayed ImageView, but this takes way too long, bitmap decoding, rotation and loading it to view, around 0,5 second to show on screen.

I cannot wait for photo result because of it's much larger size than the preview, so rotation alone on final bitmap takes like half a second.

How did you initialize FA?

    private fun prepareFotoApparat() {
        val configuration = CameraConfiguration.builder()
                .previewResolution(getHighestResolution(DEFAULT_ASPECT_RATIO))
                .photoResolution(getHighestResolution(DEFAULT_ASPECT_RATIO))
                .frameProcessor(object : FrameProcessor {
                    override fun process(frame: Frame) {
                        if (freezeFrame) {
                            frame.display()
                            freezeFrame = false
                        }
                    }
                }).build()

        fotoapparat = Fotoapparat(
                context = requireContext(),
                view = binding.cameraView,
                scaleType = ScaleType.CenterInside,
                lensPosition = back(),
                cameraConfiguration = configuration,
                logger = if (BuildConfig.DEBUG) logcat() else none(),
                cameraErrorCallback = { error ->
                    Timber.e(error)
                }
        )
    }

What was the result you received?

It was too slow to load frame from frameProcessor to separate view

What did you expect?

It would be awesome to able to call something like stop() on preview, or attach some kind of transformation that would get frames before they are displayed so I could just freeze on chosen one if I need that.

Actualy calling stop on fotoapparat object does exactly what I need, but it also stops all image processing in the background so I cannot receive a picture after calling it.

RedApparat / Fotoapparat