/// <summary>
/// Creates the font handle.
/// </summary>
private unsafe WindowsFont(NativeMethods.LOGFONTW logFont, FontStyle style, bool createHandle)
{
Debug.Assert(Hfont == IntPtr.Zero, "hFont is not null, this will generate a handle leak.");
_logFont = logFont;
if (_logFont.FaceName.Length == 0)
{
_logFont.FaceName = DefaultFaceName;
}
Style = style;
if (createHandle)
{
Hfont = IntUnsafeNativeMethods.CreateFontIndirectW(ref _logFont);
if (Hfont == IntPtr.Zero)
{
_logFont.FaceName = DefaultFaceName;
_logFont.lfOutPrecision = IntNativeMethods.OUT_TT_ONLY_PRECIS; // TrueType only.
Hfont = IntUnsafeNativeMethods.CreateFontIndirectW(ref _logFont);
}
// Update logFont height and other adjusted parameters.
IntUnsafeNativeMethods.GetObjectW(new HandleRef(this, Hfont), sizeof(NativeMethods.LOGFONTW), ref _logFont);
// We created the hFont, we will delete it on dispose.
_ownHandle = true;
}
}
/// <summary>
/// Creates a WindowsFont from the handle to a native GDI font and optionally takes ownership of managing
/// the lifetime of the handle.
/// </summary>
public unsafe static WindowsFont FromHfont(IntPtr hFont, bool takeOwnership = false)
{
NativeMethods.LOGFONTW logFont = new NativeMethods.LOGFONTW();
IntUnsafeNativeMethods.GetObjectW(new HandleRef(null, hFont), sizeof(NativeMethods.LOGFONTW), ref logFont);
FontStyle style = FontStyle.Regular;
if (logFont.lfWeight == IntNativeMethods.FW_BOLD)
{
style |= FontStyle.Bold;
}
if (logFont.lfItalic == True)
{
style |= FontStyle.Italic;
}
if (logFont.lfUnderline == True)
{
style |= FontStyle.Underline;
}
if (logFont.lfStrikeOut == True)
{
style |= FontStyle.Strikeout;
}
WindowsFont wf = new WindowsFont(logFont, style, createHandle: false)
{
Hfont = hFont,
_ownHandle = takeOwnership // if true, hFont will be deleted on dispose.
};
return(wf);
}
