示例#1
0
        public void SetBitmap(Bitmap bitmap)
        {
            if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)
            {
                throw new ApplicationException("The bitmap must be 32ppp with alpha-channel.");
            }
            var screenDc  = Win32.GetDC(IntPtr.Zero);
            var memDc     = Win32.CreateCompatibleDC(screenDc);
            var hBitmap   = IntPtr.Zero;
            var oldBitmap = IntPtr.Zero;

            try
            {
                hBitmap   = bitmap.GetHbitmap(Color.FromArgb(0));
                oldBitmap = Win32.SelectObject(memDc, hBitmap);
                var size        = new Win32.Size(bitmap.Width, bitmap.Height);
                var pointSource = new Win32.Point(0, 0);
                var topPos      = new Win32.Point(Left, Top);
                var blend       = new Win32.Blendfunction
                {
                    BlendOp             = Win32.AC_SRC_OVER,
                    BlendFlags          = 0,
                    SourceConstantAlpha = 255,
                    AlphaFormat         = Win32.AC_SRC_ALPHA
                };
                Win32.UpdateLayeredWindow(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);
                timer1.Start();
            }
        }
示例#2
0
 public void SetBitmap(Bitmap bitmap)
 {
     if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)
         throw new ApplicationException("The bitmap must be 32ppp with alpha-channel.");
     var screenDc = Win32.GetDC(IntPtr.Zero);
     var memDc = Win32.CreateCompatibleDC(screenDc);
     var hBitmap = IntPtr.Zero;
     var oldBitmap = IntPtr.Zero;
     try
     {
         hBitmap = bitmap.GetHbitmap(Color.FromArgb(0));
         oldBitmap = Win32.SelectObject(memDc, hBitmap);
         var size = new Win32.Size(bitmap.Width, bitmap.Height);
         var pointSource = new Win32.Point(0, 0);
         var topPos = new Win32.Point(Left, Top);
         var blend = new Win32.Blendfunction
         {
             BlendOp = Win32.AC_SRC_OVER,
             BlendFlags = 0,
             SourceConstantAlpha = 255,
             AlphaFormat = Win32.AC_SRC_ALPHA
         };
         Win32.UpdateLayeredWindow(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);
         timer1.Start();
     }
 }