Functions
 FunctionDescription
 calculateScaleRatioToFill Calculates a scale value to maintain aspect ratio and fill the required bounds (with the possibility of cutting of the edges a bit).
 calculateScaleRatioToFit Calculates a scale value to maintain aspect ratio and fit inside the required bounds (with the possibility of a bit of empty space on the edges).
 getDisplayObjectDepthFromStage Calculates how many levels deep the target object is on the display list, starting from the Starling stage.
 stageToStarling Finds the Starling instance that controls a particular starling.display.Stage.