Microsoft.Xna.Framework.Graphics.Texture.GetPitch C# (CSharp) Method

        internal int GetPitch(int width)
        {
            Debug.Assert(width > 0, "The width is negative!");

            int pitch;

            switch (_format)
            {
                case SurfaceFormat.Dxt1:
                case SurfaceFormat.Dxt1SRgb:
                case SurfaceFormat.Dxt1a:
                case SurfaceFormat.RgbPvrtc2Bpp:
                case SurfaceFormat.RgbaPvrtc2Bpp:
                case SurfaceFormat.RgbEtc1:
                case SurfaceFormat.Dxt3:
                case SurfaceFormat.Dxt3SRgb:
                case SurfaceFormat.Dxt5:
                case SurfaceFormat.Dxt5SRgb:
                case SurfaceFormat.RgbPvrtc4Bpp:
                case SurfaceFormat.RgbaPvrtc4Bpp:                    
                    pitch = ((width + 3) / 4) * _format.GetSize();
                    break;

                default:
                    pitch = width * _format.GetSize();
                    break;
            };

            return pitch;
        }