ComponentFactory.Krypton.Ribbon.PI.CreateDIBSection C# (CSharp) Method

        internal static extern IntPtr CreateDIBSection(IntPtr hDC, BITMAPINFO pBMI, uint iUsage, int ppvBits, IntPtr hSection, uint dwOffset);

        private void RenderOnComposition(RenderContext context)
        {
            // Convert the clipping rectangle from floating to int version
            RectangleF rectClipF = context.Graphics.ClipBounds;
            Rectangle  rectClip  = new Rectangle((int)rectClipF.X, (int)rectClipF.Y,
                                                 (int)rectClipF.Width, (int)rectClipF.Height);

            // No point drawing unless some of the client fits into the clipping area
            if (rectClip.IntersectsWith(ClientRectangle))
            {
                // Get the hDC for the graphics instance and create a memory DC
                IntPtr gDC = context.Graphics.GetHdc();
                IntPtr mDC = PI.CreateCompatibleDC(gDC);

                PI.BITMAPINFO bmi = new PI.BITMAPINFO();
                bmi.biSize        = Marshal.SizeOf(bmi);
                bmi.biWidth       = ClientWidth;
                bmi.biHeight      = -ClientHeight;
                bmi.biCompression = 0;
                bmi.biBitCount    = 32;
                bmi.biPlanes      = 1;

                // Create a device independant bitmp and select into the memory DC
                IntPtr hDIB = PI.CreateDIBSection(gDC, bmi, 0, 0, IntPtr.Zero, 0);
                PI.SelectObject(mDC, hDIB);

                // To call the renderer we need to convert from Win32 HDC to Graphics object
                using (Graphics bitmapG = Graphics.FromHdc(mDC))
                {
                    Rectangle renderClientRect = new Rectangle(0, 0, ClientWidth, ClientHeight);

                    // Create new render context that uses the bitmap graphics instance
                    using (RenderContext bitmapContext = new RenderContext(context.Control,
                                                                           bitmapG,
                                                                           renderClientRect,
                                                                           context.Renderer))
                    {
                        // Finally we get the renderer to draw the background for the bitmap
                        _mementoBack = context.Renderer.RenderRibbon.DrawRibbonTabContextTitle(_ribbon.RibbonShape, bitmapContext, renderClientRect, _ribbon.StateCommon.RibbonGeneral, this, _mementoBack);
                    }
                }

                // Select the font for use when drawing
                IntPtr hFont = _contentProvider.GetContentShortTextFont(State).ToHfont();
                PI.SelectObject(mDC, hFont);

                // Get renderer for the correct state
                VisualStyleRenderer renderer = new VisualStyleRenderer(VisualStyleElement.Window.Caption.Active);

                // Create structures needed for theme drawing call
                PI.RECT textBounds = new PI.RECT();
                textBounds.left   = TEXT_SIDE_GAP_COMPOSITION;
                textBounds.top    = 0;
                textBounds.right  = ClientWidth - (TEXT_SIDE_GAP_COMPOSITION * 2);
                textBounds.bottom = ClientHeight;
                PI.DTTOPTS dttOpts = new PI.DTTOPTS();
                dttOpts.dwSize    = Marshal.SizeOf(typeof(PI.DTTOPTS));
                dttOpts.dwFlags   = PI.DTT_COMPOSITED | PI.DTT_GLOWSIZE | PI.DTT_TEXTCOLOR;
                dttOpts.crText    = ColorTranslator.ToWin32(SystemColors.ActiveCaptionText);
                dttOpts.iGlowSize = (_ribbon.Enabled ? 12 : 2);

                // Always draw text centered
                TextFormatFlags textFormat = TextFormatFlags.SingleLine |
                                             TextFormatFlags.HorizontalCenter |
                                             TextFormatFlags.VerticalCenter |
                                             TextFormatFlags.EndEllipsis;

                // Perform actual drawing
                PI.DrawThemeTextEx(renderer.Handle,
                                   mDC, 0, 0,
                                   GetShortText(), -1, (int)textFormat,
                                   ref textBounds, ref dttOpts);

                // Copy to foreground
                PI.BitBlt(gDC,
                          ClientLocation.X, ClientLocation.Y,
                          ClientWidth, ClientHeight,
                          mDC, 0, 0, 0x00CC0020);

                // Dispose of allocated objects
                PI.DeleteObject(hFont);
                PI.DeleteObject(hDIB);
                PI.DeleteDC(mDC);

                // Must remember to release the hDC
                context.Graphics.ReleaseHdc(gDC);
            }
        }