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);
}
/// <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);
}
}
