/// <summary>
/// Creates the font handle.
/// </summary>
private void CreateFont()
{
Debug.Assert(hFont == IntPtr.Zero, "hFont is not null, this will generate a handle leak.");
Debug.Assert(logFont != null, "WindowsFont.logFont not initialized.");
hFont = IntUnsafeNativeMethods.CreateFontIndirect(logFont);
#if TRACK_HFONT
Debug.WriteLine(DbgUtil.StackTraceToStr(String.Format("HFONT[0x{0:x8}] = CreateFontIndirect( LOGFONT={1} )", (int)this.hFont, this.logFont)));
#endif
if (hFont == IntPtr.Zero)
{
logFont.lfFaceName = defaultFaceName;
logFont.lfOutPrecision = IntNativeMethods.OUT_TT_ONLY_PRECIS; // True Type only.
hFont = IntUnsafeNativeMethods.CreateFontIndirect(logFont);
#if TRACK_HFONT
Debug.WriteLine(DbgUtil.StackTraceToStr(String.Format("HFONT[0x{0:x8}] = CreateFontIndirect( LOGFONT={1} )", (int)this.hFont, this.logFont)));
#endif
}
// Update logFont height and other adjusted parameters.
//
IntUnsafeNativeMethods.GetObject(new HandleRef(this, hFont), logFont);
// We created the hFont, we will delete it on dispose.
ownHandle = true;
}
public static WindowsBrush FromDC(DeviceContext dc)
{
IntPtr hBrush = IntUnsafeNativeMethods.GetCurrentObject(new HandleRef(null, dc.Hdc), IntNativeMethods.OBJ_BRUSH);
IntNativeMethods.LOGBRUSH logBrush = new IntNativeMethods.LOGBRUSH();
IntUnsafeNativeMethods.GetObject(new HandleRef(null, hBrush), logBrush);
// don't call DeleteObject on handle from GetCurrentObject, it is the one selected in the hdc.
return(WindowsBrush.FromLogBrush(dc, logBrush));
}
/// <devdoc>
/// Creates a WindowsFont from the handle to a native GDI font and optionally takes ownership of managing
/// the lifetime of the handle.
/// </devdoc>
public static WindowsFont FromHfont(IntPtr hFont, bool takeOwnership)
{
IntNativeMethods.LOGFONT lf = new IntNativeMethods.LOGFONT();
IntUnsafeNativeMethods.GetObject(new HandleRef(null, hFont), lf);
WindowsFont wf = new WindowsFont(lf, /*createHandle*/ false);
wf.hFont = hFont;
wf.ownHandle = takeOwnership; // if true, hFont will be deleted on dispose.
return(wf);
}