calculate
fun calculateModifiedRect(frameCroppingMode: FrameHandler.FrameCroppingMode, finderRect: Rect, imageWidth: Int, imageHeight: Int, imageOrientation: Int): Rect?
Calculates modified Rect based on given finderRect and frameCroppingMode.
if FrameHandler.FrameCroppingMode.CropToFinder - returns finderRect
if FrameHandler.FrameCroppingMode.CropWithPadding - returns finderRect with additional padding
if FrameHandler.FrameCroppingMode.FullFrame - returns null
if FrameHandler.FrameCroppingMode.SquareToFrameCropping - returns square rect based on finderRect