private WindowsFont(IntNativeMethods.LOGFONT lf, bool createHandle)
{
this.fontSize = -1f;
this.logFont = lf;
if (this.logFont.lfFaceName == null)
{
this.logFont.lfFaceName = "Microsoft Sans Serif";
}
this.style = FontStyle.Regular;
if (lf.lfWeight == 700)
{
this.style |= FontStyle.Bold;
}
if (lf.lfItalic == 1)
{
this.style |= FontStyle.Italic;
}
if (lf.lfUnderline == 1)
{
this.style |= FontStyle.Underline;
}
if (lf.lfStrikeOut == 1)
{
this.style |= FontStyle.Strikeout;
}
if (createHandle)
{
this.CreateFont();
}
}
public static int GetObject(HandleRef hFont, IntNativeMethods.LOGFONT lp)
{
int retVal = IntGetObject(hFont, System.Runtime.InteropServices.Marshal.SizeOf(typeof(IntNativeMethods.LOGFONT)), lp);
DbgUtil.AssertWin32(retVal != 0, "GetObject(hObj=[0x{0:X8}], [LOGFONT]) failed.", hFont.Handle);
return(retVal);
}
/// <summary>
/// Contructor to construct font from a LOGFONT structure.
/// Pass false in the createHandle param to create a 'compatible' font (handle-less, to be used for measuring/comparing) or
/// when the handle has already been created.
/// </summary>
private WindowsFont(IntNativeMethods.LOGFONT lf, bool createHandle)
{
Debug.Assert(lf != null, "lf is null");
logFont = lf;
if (logFont.lfFaceName == null)
{
logFont.lfFaceName = defaultFaceName;
}
style = FontStyle.Regular;
if (lf.lfWeight == IntNativeMethods.FW_BOLD)
{
style |= FontStyle.Bold;
}
if (lf.lfItalic == 1)
{
style |= FontStyle.Italic;
}
if (lf.lfUnderline == 1)
{
style |= FontStyle.Underline;
}
if (lf.lfStrikeOut == 1)
{
style |= FontStyle.Strikeout;
}
if (createHandle)
{
CreateFont();
}
}
/// <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);
}
public WindowsFont(string faceName, float size, FontStyle style, byte charSet, WindowsFontQuality fontQuality)
{
this.fontSize = -1f;
this.logFont = new IntNativeMethods.LOGFONT();
int num = (int) Math.Ceiling((double) ((WindowsGraphicsCacheManager.MeasurementGraphics.DeviceContext.DpiY * size) / 72f));
this.logFont.lfHeight = -num;
this.logFont.lfFaceName = (faceName != null) ? faceName : "Microsoft Sans Serif";
this.logFont.lfCharSet = charSet;
this.logFont.lfOutPrecision = 4;
this.logFont.lfQuality = (byte) fontQuality;
this.logFont.lfWeight = ((style & FontStyle.Bold) == FontStyle.Bold) ? 700 : 400;
this.logFont.lfItalic = ((style & FontStyle.Italic) == FontStyle.Italic) ? ((byte) 1) : ((byte) 0);
this.logFont.lfUnderline = ((style & FontStyle.Underline) == FontStyle.Underline) ? ((byte) 1) : ((byte) 0);
this.logFont.lfStrikeOut = ((style & FontStyle.Strikeout) == FontStyle.Strikeout) ? ((byte) 1) : ((byte) 0);
this.style = style;
this.CreateFont();
}
/// <summary>
/// Contructor to construct font from a face name, a desired size in points and with the specified style
/// and character set. The screen dc is used for calculating the font em height.
/// </summary>>
public WindowsFont(string faceName, float size, FontStyle style, byte charSet, WindowsFontQuality fontQuality)
{
Debug.Assert(size > 0.0f, "size has a negative value.");
const byte True = 1;
const byte False = 0;
logFont = new IntNativeMethods.LOGFONT();
//
// 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.
//
int pixelsY = (int)Math.Ceiling(WindowsGraphicsCacheManager.MeasurementGraphics.DeviceContext.DpiY * size / 72); // 1 point = 1/72 inch.;
//
// 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).
//
logFont.lfHeight = -pixelsY;
logFont.lfFaceName = faceName ?? defaultFaceName;
logFont.lfCharSet = charSet;
logFont.lfOutPrecision = IntNativeMethods.OUT_TT_PRECIS;
logFont.lfQuality = (byte)fontQuality;
logFont.lfWeight = (style & FontStyle.Bold) == FontStyle.Bold ? IntNativeMethods.FW_BOLD : IntNativeMethods.FW_NORMAL;
logFont.lfItalic = (style & FontStyle.Italic) == FontStyle.Italic ? True : False;
logFont.lfUnderline = (style & FontStyle.Underline) == FontStyle.Underline ? True : False;
logFont.lfStrikeOut = (style & FontStyle.Strikeout) == FontStyle.Strikeout ? True : False;
// Let the Size be recomputed to be consistent with the Height (there may be some precision loss coming from size to height).
// this.fontSize = size;
this.style = style;
CreateFont();
}
public static extern int IntGetObject(HandleRef hFont, int nSize, [In, Out] IntNativeMethods.LOGFONT lf);
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;
}
private WindowsFont( IntNativeMethods.LOGFONT lf, bool createHandle )
{
Debug.Assert( lf != null, "lf is null" );
this.logFont = lf;
if (this.logFont.lfFaceName == null)
{
this.logFont.lfFaceName = defaultFaceName;
}
this.style = FontStyle.Regular;
if (lf.lfWeight == IntNativeMethods.FW_BOLD)
{
this.style |= FontStyle.Bold;
}
if (lf.lfItalic == 1)
{
this.style |= FontStyle.Italic;
}
if (lf.lfUnderline == 1)
{
this.style |= FontStyle.Underline;
}
if (lf.lfStrikeOut == 1)
{
this.style |= FontStyle.Strikeout;
}
if( createHandle )
{
CreateFont();
}
}
public WindowsFont( string faceName, float size, FontStyle style, byte charSet, WindowsFontQuality fontQuality )
{
Debug.Assert( size > 0.0f, "size has a negative value." );
const byte True = 1;
const byte False = 0;
this.logFont = new IntNativeMethods.LOGFONT();
//
// 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.
//
int pixelsY = (int) Math.Ceiling( WindowsGraphicsCacheManager.MeasurementGraphics.DeviceContext.DpiY * size / 72); // 1 point = 1/72 inch.;
//
// 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).
//
this.logFont.lfHeight = -pixelsY;
this.logFont.lfFaceName = faceName != null ? faceName : defaultFaceName;
this.logFont.lfCharSet = charSet;
this.logFont.lfOutPrecision = IntNativeMethods.OUT_TT_PRECIS;
this.logFont.lfQuality = (byte) fontQuality;
this.logFont.lfWeight = (style & FontStyle.Bold) == FontStyle.Bold ? IntNativeMethods.FW_BOLD : IntNativeMethods.FW_NORMAL;
this.logFont.lfItalic = (style & FontStyle.Italic) == FontStyle.Italic ? True : False;
this.logFont.lfUnderline = (style & FontStyle.Underline) == FontStyle.Underline ? True : False;
this.logFont.lfStrikeOut = (style & FontStyle.Strikeout) == FontStyle.Strikeout ? True : False;
// Let the Size be recomputed to be consistent with the Height (there may be some precision loss coming from size to height).
// this.fontSize = size;
this.style = style;
CreateFont();
}
public static WindowsFont FromHfont(IntPtr hFont, bool takeOwnership)
{
IntNativeMethods.LOGFONT lp = new IntNativeMethods.LOGFONT();
IntUnsafeNativeMethods.GetObject(new HandleRef(null, hFont), lp);
return new WindowsFont(lp, false) { hFont = hFont, ownHandle = takeOwnership };
}
