UnityEditor.RectangleTool.CalculateScaleTimeMatrix C# (CSharp) Method

        public bool CalculateScaleTimeMatrix(float fromTime, float toTime, float offsetTime, float pivotTime, float frameRate, out Matrix4x4 transform, out bool flipKeys)
        {
            transform = Matrix4x4.identity;
            flipKeys = false;
            float num = !Mathf.Approximately(frameRate, 0f) ? (1f / frameRate) : 0.001f;
            float f = toTime - pivotTime;
            float num3 = fromTime - pivotTime;
            if ((Mathf.Abs(f) - offsetTime) < 0f)
            {
                return false;
            }
            f = (Mathf.Sign(f) != Mathf.Sign(num3)) ? (f + offsetTime) : (f - offsetTime);
            if (Mathf.Approximately(num3, 0f))
            {
                transform.SetTRS(new Vector3(f, 0f, 0f), Quaternion.identity, Vector3.one);
                flipKeys = false;
                return true;
            }
            if (Mathf.Abs(f) < num)
            {
                f = (f >= 0f) ? num : -num;
            }
            float x = f / num3;
            transform.SetTRS(new Vector3(pivotTime, 0f, 0f), Quaternion.identity, Vector3.one);
            transform *= Matrix4x4.TRS(Vector3.zero, Quaternion.identity, new Vector3(x, 1f, 1f));
            transform *= Matrix4x4.TRS(new Vector3(-pivotTime, 0f), Quaternion.identity, Vector3.one);
            flipKeys = x < 0f;
            return true;
        }