private void CreateFont(string familyName, float emSize, FontStyle style, GraphicsUnit unit, byte charSet, bool isVertical)
{
_originalFontName = familyName;
FontFamily family;
// NOTE: If family name is null, empty or invalid,
// MS creates Microsoft Sans Serif font.
try
{
family = new FontFamily(familyName);
}
catch (Exception)
{
family = FontFamily.GenericSansSerif;
}
Initialize(family, emSize, style, unit, charSet, isVertical);
int status = Gdip.GdipCreateFont(new HandleRef(this, family.NativeFamily), emSize, style, unit, out _nativeFont);
if (status == Gdip.FontStyleNotFound)
{
throw new ArgumentException($"Style {style} isn't supported by font {familyName}.");
}
Gdip.CheckStatus(status);
}
public Font(Font prototype, FontStyle newStyle)
{
// no null checks, MS throws a NullReferenceException if original is null
Initialize(prototype.FontFamily, prototype.Size, newStyle, prototype.Unit, prototype.GdiCharSet, prototype.GdiVerticalFont);
int status = Gdip.GdipCreateFont(new HandleRef(_fontFamily, _fontFamily.NativeFamily), Size, Style, Unit, out _nativeFont);
Gdip.CheckStatus(status);
}
public Font(FontFamily family, float emSize, FontStyle style,
GraphicsUnit unit, byte gdiCharSet, bool gdiVerticalFont)
{
if (family == null)
{
throw new ArgumentNullException(nameof(family));
}
int status;
Initialize(family, emSize, style, unit, gdiCharSet, gdiVerticalFont);
status = Gdip.GdipCreateFont(new HandleRef(this, family.NativeFamily), emSize, style, unit, out _nativeFont);
Gdip.CheckStatus(status);
}
///<summary>
/// Creates the GDI+ native font object.
///</summary>
private void CreateNativeFont()
{
Debug.Assert(_nativeFont == IntPtr.Zero, "nativeFont already initialized, this will generate a handle leak.");
Debug.Assert(_fontFamily != null, "fontFamily not initialized.");
// Note: GDI+ creates singleton font family objects (from the corresponding font file) and reference count them so
// if creating the font object from an external FontFamily, this object's FontFamily will share the same native object.
int status = Gdip.GdipCreateFont(
new HandleRef(this, _fontFamily.NativeFamily),
_fontSize,
_fontStyle,
_fontUnit,
out _nativeFont);
// Special case this common error message to give more information
if (status == Gdip.FontStyleNotFound)
{
throw new ArgumentException(SR.Format(SR.GdiplusFontStyleNotFound, _fontFamily.Name, _fontStyle.ToString()));
}
else if (status != Gdip.Ok)
{
throw Gdip.StatusException(status);
}
}