Ejemplo n.º 1
0
        public static void DrawTextOnGlass(Graphics graphics, string text, Font font, Rectangle bounds,
            Color color, TextFormatFlags flags, bool withGlow)
        {
            IntPtr primaryHdc = graphics.GetHdc();

              // Memory DC for off screen rendering.
              IntPtr memoryHdc = CreateCompatibleDC(primaryHdc);

              BITMAPINFO info = new BITMAPINFO();
              info.biSize = Marshal.SizeOf(info);
              info.biWidth = bounds.Width;
              info.biHeight = -bounds.Height;
              info.biPlanes = 1;
              info.biBitCount = 32;
              info.biCompression = 0; // BI_RGB
              IntPtr dib = CreateDIBSection(primaryHdc, info, 0, 0, IntPtr.Zero, 0);
              SelectObject(memoryHdc, dib);

              IntPtr fontHandle = font.ToHfont();
              SelectObject(memoryHdc, fontHandle);

              // Draw glowing text if enabled.
              VisualStyleRenderer renderer = new VisualStyleRenderer(VisualStyleElement.Window.Caption.Active);
              DTTOPTS dttOpts = new DTTOPTS();
              dttOpts.dwSize = (uint)Marshal.SizeOf(typeof(DTTOPTS));

              if (withGlow)
              {
            dttOpts.dwFlags = DTT_COMPOSITED | DTT_GLOWSIZE | DTT_TEXTCOLOR;
            dttOpts.iGlowSize = 12;
              }
              else
              {
            dttOpts.dwFlags = DTT_COMPOSITED | DTT_TEXTCOLOR;
            dttOpts.iGlowSize = 0;
              }
              dttOpts.crText = (uint)ColorTranslator.ToWin32(color);
              RECT textBounds = new RECT(dttOpts.iGlowSize, 0, bounds.Width - dttOpts.iGlowSize, bounds.Height);
              DrawThemeTextEx(renderer.Handle, memoryHdc, 0, 0, text, -1, (int)flags, ref textBounds, ref dttOpts);

              //const int SRCCOPY = 0x00CC0020;
              //BitBlt(primaryHdc, bounds.Left, bounds.Top, bounds.Width, bounds.Height, memoryHdc, 0, 0, SRCCOPY);

              BLENDFUNCTION blend = new Win32.BLENDFUNCTION(AC_SRC_OVER, 0, 255, AC_SRC_ALPHA);
              AlphaBlend(primaryHdc, bounds.Left, bounds.Top, bounds.Width, bounds.Height, memoryHdc, 0, 0,
            bounds.Width, bounds.Height, blend);

              // Clean up
              DeleteObject(fontHandle);
              DeleteObject(dib);
              DeleteDC(memoryHdc);

              graphics.ReleaseHdc(primaryHdc);
        }
Ejemplo n.º 2
0
        /// <summary>
        /// Sets the given bitmap as window content with transparent parts via the
        /// layered windows API.
        /// </summary>
        /// <param name="bitmap">The bitmap to set.</param>
        /// <param name="opacity">The overall opacity (255 = opaque).</param>
        public static void SetBitmap(Control control, Bitmap bitmap, int opacity)
        {
            if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)
            throw new ApplicationException("The bitmap must be 32ppp with alpha-channel.");

              IntPtr screenDc = Win32.GetDC(IntPtr.Zero);
              IntPtr memDc = Win32.CreateCompatibleDC(screenDc);
              IntPtr hBitmap = IntPtr.Zero;
              IntPtr oldBitmap = IntPtr.Zero;

              try
              {
            hBitmap = bitmap.GetHbitmap(Color.FromArgb(0));  // grab a GDI handle from this GDI+ bitmap
            oldBitmap = Win32.SelectObject(memDc, hBitmap);

            Win32.SIZE size = new Win32.SIZE(bitmap.Width, bitmap.Height);
            Win32.POINT pointSource = new Win32.POINT(0, 0);
            Win32.POINT topPos = new Win32.POINT(control.Left, control.Top);
            Win32.BLENDFUNCTION blend = new Win32.BLENDFUNCTION();
            blend.BlendOp = Win32.AC_SRC_OVER;
            blend.BlendFlags = 0;
            blend.SourceConstantAlpha = (byte)opacity;
            blend.AlphaFormat = Win32.AC_SRC_ALPHA;

            if (!control.IsDisposed && !control.Disposing)
            {
              Win32.UpdateLayeredWindow(control.Handle, screenDc, ref topPos, ref size, memDc,
            ref pointSource, 0, ref blend, Win32.ULW_ALPHA);
            }
              }
              finally
              {
            Win32.ReleaseDC(IntPtr.Zero, screenDc);
            if (hBitmap != IntPtr.Zero)
            {
              Win32.SelectObject(memDc, oldBitmap);
              Win32.DeleteObject(hBitmap);
            }
            Win32.DeleteDC(memDc);
              }
        }