private unsafe void CreateDitherBrush()
{
Debug.Assert(_hbrushDither.IsNull, "Brush should not be recreated.");
short *patternBits = stackalloc short[]
{
unchecked ((short)0xAAAA),
unchecked ((short)0x5555),
unchecked ((short)0xAAAA),
unchecked ((short)0x5555),
unchecked ((short)0xAAAA),
unchecked ((short)0x5555),
unchecked ((short)0xAAAA),
unchecked ((short)0x5555)
};
Gdi32.HBITMAP hbitmapTemp = Gdi32.CreateBitmap(8, 8, 1, 1, patternBits);
Debug.Assert(
!hbitmapTemp.IsNull,
"could not create dither bitmap. Page selector UI will not be correct");
if (!hbitmapTemp.IsNull)
{
_hbrushDither = Gdi32.CreatePatternBrush(hbitmapTemp);
Debug.Assert(
!_hbrushDither.IsNull,
"Unable to created dithered brush. Page selector UI will not be correct");
Gdi32.DeleteObject(hbitmapTemp);
}
}
private void UpdateMainMenuBrush()
{
// screen states where there is no menu yet
if (Menu == null)
return;
if (WindowState == FormWindowState.Minimized)
return;
// alias colorized resources
ColorizedResources cres = ColorizedResources.Instance;
// dispose any existing brush and/or bitmaps
if (_hMainMenuBrush != IntPtr.Zero)
DisposeGDIObject(ref _hMainMenuBrush);
if (_hMainMenuBitmap != IntPtr.Zero)
DisposeGDIObject(ref _hMainMenuBitmap);
if (_hMainMenuBrushBitmap != IntPtr.Zero)
DisposeGDIObject(ref _hMainMenuBrushBitmap);
if (_mainMenuBitmap != null)
{
Bitmap tmp = _mainMenuBitmap;
_mainMenuBitmap = null;
tmp.Dispose();
}
// create a brush which contains the menu background
_mainMenuBitmap = new Bitmap(Width, -RelativeWindowBounds.Y);
_hMainMenuBitmap = _mainMenuBitmap.GetHbitmap();
using (Graphics g = Graphics.FromImage(_mainMenuBitmap))
{
Rectangle bounds = MenuBounds;
Debug.WriteLine("MenuBounds: " + bounds);
if (cres.CustomMainMenuPainting)
{
// paint custom menu background
CustomPaintMenuBackground(g, bounds);
}
else
{
using (Brush brush = new SolidBrush(SystemMainMenuColor))
g.FillRectangle(brush, bounds);
}
}
_hMainMenuBrushBitmap = _mainMenuBitmap.GetHbitmap();
_hMainMenuBrush = Gdi32.CreatePatternBrush(_hMainMenuBrushBitmap);
// set the brush
MENUINFO mi = new MENUINFO();
mi.cbSize = Marshal.SizeOf(typeof(MENUINFO));
mi.fMask = MIM.BACKGROUND;
mi.hbrBack = _hMainMenuBrush;
User32.SetMenuInfo(Menu.Handle, ref mi);
User32.DrawMenuBar(Handle);
}
