Pinta.LevelsDialog.UpdateGammaByMask C# (CSharp) Method

        private void UpdateGammaByMask(float val)
        {
            float average = -1;

            if (!(mask [0] || mask [1] || mask [2]))
                return;

            do {
                average = MaskGamma ();
                float factor = val / average;

                for (int c = 0; c < 3; c++) {
                    if (mask [c]) {
                        Levels.SetGamma (c, factor * Levels.GetGamma (c));
                    }
                }
            } while (Math.Abs (val - average) > 0.001);
        }