在TextureView Camera2 API上捏缩放缩快

Question

我最近使用Google repo Camera2Basic中的代码和此StackOverflow问题在TextureView上实现了Pinch Zoom：Zoom Camera2 Preview using TextureView

private var finger_spacing = 0f
private var zoom_level = 1f

override fun onTouch(view: View?, motionEvent: MotionEvent?): Boolean {
        // Multi-touch -> ZOOM
        // https://stackoverflow.com/questions/32711975/zoom-camera2-preview-using-textureview?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa
        if (motionEvent != null && view != null) {
            if (motionEvent.pointerCount > 1) {
                val characteristics = cameraManager.getCameraCharacteristics(currentDeviceId)
                val maxzoom = characteristics.get(CameraCharacteristics.SCALER_AVAILABLE_MAX_DIGITAL_ZOOM) * 10

            val m = characteristics.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE)
            val current_finger_spacing = getFingerSpacing(motionEvent)
            if (finger_spacing != 0f) {
                if (current_finger_spacing > finger_spacing && maxzoom > zoom_level) {
                    zoom_level += 0.4f
                } else if (current_finger_spacing < finger_spacing && zoom_level > 1) {
                    zoom_level -= 0.4f
                }
                val minW = (m.width() / maxzoom).toInt()
                val minH = (m.height() / maxzoom).toInt()
                val difW = m.width() - minW
                val difH = m.height() - minH
                var cropW = (difW / 100 * zoom_level).toInt()
                var cropH = (difH / 100 * zoom_level).toInt()
                cropW -= cropW and 3
                cropH -= cropH and 3
                val zoom = Rect(cropW, cropH,
                            m.width() - cropW, m.height() - cropH)
                captureRequestBuilder.set(CaptureRequest.SCALER_CROP_REGION, zoom)
            }
            finger_spacing = current_finger_spacing
            return true
        }

捏缩放可以正常工作，但每次进行缩放时都会出现断断续续的情况，并且它无法像Android上的原生相机一样平滑。我真的很感激如何解决这个问题。感谢