LibRdlCrossPlatformViewer.PageDrawing.DrawImageBackground C# (CSharp) Method

        private void DrawImageBackground(PageImage pi, StyleInfo si, Graphics g, RectangleF r)
        {
            Stream strm = null;
            System.Drawing.Image im = null;
            try
            {
                strm = new MemoryStream(pi.ImageData);
                im = System.Drawing.Image.FromStream(strm);

                // http://www.fyireporting.com/forum/viewtopic.php?t=892
                //A.S.> convert pt to px if needed(when printing we need px, when draw preview - pt)

                RectangleF r2;
                if (g.PageUnit == GraphicsUnit.Pixel)
                {
                    r2 = new RectangleF(r.Left + (si.PaddingLeft * g.DpiX) / 72,
                    r.Top + (si.PaddingTop * g.DpiX) / 72,
                    r.Width - ((si.PaddingLeft + si.PaddingRight) * g.DpiX) / 72,
                    r.Height - ((si.PaddingTop + si.PaddingBottom) * g.DpiX) / 72);
                }
                else
                {
                    // adjust drawing rectangle based on padding
                    r2 = new RectangleF(r.Left + si.PaddingLeft,
                    r.Top + si.PaddingTop,
                    r.Width - si.PaddingLeft - si.PaddingRight,
                    r.Height - si.PaddingTop - si.PaddingBottom);
                }

                int repeatX = 0;
                int repeatY = 0;
                switch (pi.Repeat)
                {
                    case ImageRepeat.Repeat:
                        repeatX = (int)Math.Floor(r2.Width / pi.SamplesW);
                        repeatY = (int)Math.Floor(r2.Height / pi.SamplesH);
                        break;
                    case ImageRepeat.RepeatX:
                        repeatX = (int)Math.Floor(r2.Width / pi.SamplesW);
                        repeatY = 1;
                        break;
                    case ImageRepeat.RepeatY:
                        repeatY = (int)Math.Floor(r2.Height / pi.SamplesH);
                        repeatX = 1;
                        break;
                    case ImageRepeat.NoRepeat:
                    default:
                        repeatX = repeatY = 1;
                        break;
                }

                //make sure the image is drawn at least 1 times
                repeatX = Math.Max(repeatX, 1);
                repeatY = Math.Max(repeatY, 1);

                float startX = r2.Left;
                float startY = r2.Top;

                Region saveRegion = g.Clip;
                Region clipRegion = new Region(g.Clip.GetRegionData());
                clipRegion.Intersect(r2);
                g.Clip = clipRegion;

                for (int i = 0; i < repeatX; i++)
                {
                    for (int j = 0; j < repeatY; j++)
                    {
                        float currX = startX + i * pi.SamplesW;
                        float currY = startY + j * pi.SamplesH;
                        g.DrawImage(im, new RectangleF(currX, currY, pi.SamplesW, pi.SamplesH));
                    }
                }
                g.Clip = saveRegion;
            }
            finally
            {
                if (strm != null)
                    strm.Close();
                if (im != null)
                    im.Dispose();
            }
        }