public IntPtr MarshalManagedToNative(object obj)
{
Font font = (Font)obj;
User32.LOGFONTW logFont = User32.LOGFONTW.FromFont(font);
var fontDesc = new Oleaut32.FONTDESC
{
cbSizeOfStruct = (uint)Marshal.SizeOf <Oleaut32.FONTDESC>(),
lpstrName = font.Name,
cySize = (long)(font.SizeInPoints * 10000),
sWeight = (short)logFont.lfWeight,
sCharset = logFont.lfCharSet,
fItalic = font.Italic.ToBOOL(),
fUnderline = font.Underline.ToBOOL(),
fStrikethrough = font.Strikeout.ToBOOL(),
};
Guid iid = typeof(Ole32.IFont).GUID;
Ole32.IFont oleFont = Oleaut32.OleCreateFontIndirect(ref fontDesc, ref iid);
IntPtr pFont = Marshal.GetIUnknownForObject(oleFont);
int hr = Marshal.QueryInterface(pFont, ref iid, out IntPtr pIFont);
Marshal.Release(pFont);
if (((HRESULT)hr).Failed())
{
Marshal.ThrowExceptionForHR(hr);
}
return(pIFont);
}
/// <summary>
/// Creates the font handle.
/// </summary>
private unsafe WindowsFont(User32.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 = Gdi32.CreateFontIndirectW(ref _logFont);
if (Hfont == IntPtr.Zero)
{
_logFont.FaceName = DefaultFaceName;
_logFont.lfOutPrecision = Gdi32.OUT_PRECIS.TT_ONLY; // TrueType only.
Hfont = Gdi32.CreateFontIndirectW(ref _logFont);
}
// Update logFont height and other adjusted parameters.
Gdi32.GetObjectW(new HandleRef(this, Hfont), out _logFont);
// We created the hFont, we will delete it on dispose.
_ownHandle = true;
}
}
public unsafe void CreateFontIndirect()
{
User32.LOGFONTW logFont = default;
IntPtr handle = Gdi32.CreateFontIndirectW(ref logFont);
Assert.NotEqual(IntPtr.Zero, handle);
Assert.True(Gdi32.DeleteObject(handle).IsTrue());
}
/// <summary>
/// Constructs a WindowsFont object from an existing System.Drawing.Font object (GDI+), based on the screen dc
/// MapMode and resolution (normally: MM_TEXT and 96 dpi).
/// </summary>
private static Gdi32.HFONT FromFont(Font font, Gdi32.QUALITY quality = Gdi32.QUALITY.DEFAULT)
{
string familyName = font.FontFamily.Name;
// Strip vertical-font mark from the name if needed.
if (familyName != null && familyName.Length > 1 && familyName[0] == '@')
{
familyName = familyName.Substring(1);
}
// Now, creating it using the Font.SizeInPoints makes it GraphicsUnit-independent.
Debug.Assert(font.SizeInPoints > 0.0f, "size has a negative value.");
// Get the font height from the specified size. The size is in point units and height in logical units
// (pixels when using MM_TEXT) so we need to make the conversion using the number of pixels per logical
// inch along the screen height. (1 point = 1/72 inch.)
int pixelsY = (int)Math.Ceiling(DpiHelper.DeviceDpi * font.SizeInPoints / 72);
// The lfHeight represents the font cell height (line spacing) which includes the internal leading; we
// specify a negative size value (in pixels) for the height so the font mapper provides the closest match
// for the character height rather than the cell height.
User32.LOGFONTW logFont = new User32.LOGFONTW
{
lfHeight = -pixelsY,
lfCharSet = font.GdiCharSet,
lfOutPrecision = Gdi32.OUT_PRECIS.TT,
lfQuality = quality,
lfWeight = (font.Style & FontStyle.Bold) == FontStyle.Bold ? Gdi32.FW.BOLD : Gdi32.FW.NORMAL,
lfItalic = (font.Style & FontStyle.Italic) == FontStyle.Italic ? True : False,
lfUnderline = (font.Style & FontStyle.Underline) == FontStyle.Underline ? True : False,
lfStrikeOut = (font.Style & FontStyle.Strikeout) == FontStyle.Strikeout ? True : False,
FaceName = familyName
};
if (logFont.FaceName.IsEmpty)
{
logFont.FaceName = DefaultFaceName;
}
Gdi32.HFONT hfont = Gdi32.CreateFontIndirectW(ref logFont);
if (hfont.IsNull)
{
// Get the default font if we couldn't get what we requested.
logFont.FaceName = DefaultFaceName;
logFont.lfOutPrecision = Gdi32.OUT_PRECIS.TT_ONLY;
hfont = Gdi32.CreateFontIndirectW(ref logFont);
Debug.Assert(!hfont.IsNull);
}
return(hfont);
}
protected unsafe override void WndProc(ref Message m)
{
if (m.Msg == (int)User32.WM.CHOOSEFONT_GETLOGFONT)
{
using var font = new Font("Arial", 8.25f);
User32.LOGFONTW *pLogfont = (User32.LOGFONTW *)m.LParam;
object lf = new User32.LOGFONTW();
font.ToLogFont(lf);
*pLogfont = (User32.LOGFONTW)lf;
}
base.WndProc(ref m);
}
public unsafe void LogFont_FaceName()
{
User32.LOGFONTW logFont = default;
logFont.FaceName = "TwoFace";
Assert.Equal("TwoFace", logFont.FaceName.ToString());
// Set a smaller name to make sure it gets terminated properly.
logFont.FaceName = "Face";
Assert.Equal("Face", logFont.FaceName.ToString());
// LOGFONT has space for 32 characters, we want to see it gets
// cut to 31 to make room for the null.
string bigString = new string('*', 32);
logFont.FaceName = bigString;
Assert.True(logFont.FaceName.SequenceEqual(bigString.AsSpan().Slice(1)));
}
public Font GetFont(IDeviceContext dc, FontProperty prop)
{
if (dc == null)
{
throw new ArgumentNullException(nameof(dc));
}
//valid values are 0xa29 to 0xa29
if (!ClientUtils.IsEnumValid(prop, (int)prop, (int)FontProperty.GlyphFont, (int)FontProperty.GlyphFont))
{
throw new InvalidEnumArgumentException(nameof(prop), (int)prop, typeof(FontProperty));
}
User32.LOGFONTW logfont = new User32.LOGFONTW();
using (WindowsGraphicsWrapper wgr = new WindowsGraphicsWrapper(dc, AllGraphicsProperties))
{
HandleRef hdc = new HandleRef(wgr, wgr.WindowsGraphics.DeviceContext.Hdc);
lastHResult = UxTheme.GetThemeFont(new HandleRef(this, Handle), hdc, part, state, (int)prop, ref logfont);
}
Font font = null;
//check for a failed HR.
if (lastHResult.Succeeded())
{
try
{
font = Font.FromLogFont(logfont);
}
catch (Exception e)
{
if (ClientUtils.IsSecurityOrCriticalException(e))
{
throw;
}
//Looks like the font was not true type
font = null;
}
}
return(font);
}
/// <summary>
/// Contructs a WindowsFont object from an existing System.Drawing.Font object (GDI+), based on the screen dc MapMode
/// and resolution (normally: MM_TEXT and 96 dpi).
/// </summary>
public static WindowsFont FromFont(Font font, Gdi32.QUALITY fontQuality = Gdi32.QUALITY.DEFAULT)
{
string familyName = font.FontFamily.Name;
// Strip vertical-font mark from the name if needed.
if (familyName != null && familyName.Length > 1 && familyName[0] == '@')
{
familyName = familyName.Substring(1);
}
// Note: Creating the WindowsFont from Font using a LOGFONT structure from GDI+ (Font.ToLogFont(logFont)) may sound like
// a better choice (more accurate) for doing this but tests show that is not the case (see WindowsFontTests test suite),
// the results are the same. Also, that approach has some issues when the Font is created in a different application
// domain since the LOGFONT cannot be marshalled properly.
// Now, creating it using the Font.SizeInPoints makes it GraphicsUnit-independent.
Debug.Assert(font.SizeInPoints > 0.0f, "size has a negative value.");
// Get the font height from the specified size. size is in point units and height in logical
// units (pixels when using MM_TEXT) so we need to make the conversion using the number of
// pixels per logical inch along the screen height. (1 point = 1/72 inch.)
int pixelsY = (int)Math.Ceiling(WindowsGraphicsCacheManager.MeasurementGraphics.DeviceContext.DpiY * font.SizeInPoints / 72);
// The lfHeight represents the font cell height (line spacing) which includes the internal
// leading; we specify a negative size value (in pixels) for the height so the font mapper
// provides the closest match for the character height rather than the cell height (MSDN).
User32.LOGFONTW logFont = new User32.LOGFONTW()
{
lfHeight = -pixelsY,
lfCharSet = font.GdiCharSet,
lfOutPrecision = Gdi32.OUT_PRECIS.TT,
lfQuality = fontQuality,
lfWeight = (font.Style & FontStyle.Bold) == FontStyle.Bold ? Gdi32.FW.BOLD : Gdi32.FW.NORMAL,
lfItalic = (font.Style & FontStyle.Italic) == FontStyle.Italic ? True : False,
lfUnderline = (font.Style & FontStyle.Underline) == FontStyle.Underline ? True : False,
lfStrikeOut = (font.Style & FontStyle.Strikeout) == FontStyle.Strikeout ? True : False,
FaceName = familyName
};
return(new WindowsFont(logFont, font.Style, createHandle: true));
}
public static extern HFONT CreateFontIndirectW(ref User32.LOGFONTW lplf);
public static HRESULT GetThemeFont(IHandle hTheme, HandleRef hdc, int iPartId, int iStateId, int iPropId, out User32.LOGFONTW pFont)
{
HRESULT result = GetThemeFont(hTheme.Handle, hdc.Handle, iPartId, iStateId, iPropId, out pFont);
GC.KeepAlive(hTheme);
GC.KeepAlive(hdc.Wrapper);
return(result);
}
public static extern HRESULT GetThemeFont(IntPtr hTheme, IntPtr hdc, int iPartId, int iStateId, int iPropId, out User32.LOGFONTW pFont);
public static partial HRESULT GetThemeFont(IntPtr hTheme, Gdi32.HDC hdc, int iPartId, int iStateId, int iPropId, out User32.LOGFONTW pFont);