public IntPtr SelectFont(WindowsFont font)
{
if (font.Equals(this.Font))
{
return(IntPtr.Zero);
}
IntPtr ptr = this.SelectObject(font.Hfont, GdiObjectType.Font);
WindowsFont selectedFont = this.selectedFont;
this.selectedFont = font;
this.hCurrentFont = font.Hfont;
if ((selectedFont != null) && MeasurementDCInfo.IsMeasurementDC(this))
{
selectedFont.Dispose();
}
if (MeasurementDCInfo.IsMeasurementDC(this))
{
if (ptr != IntPtr.Zero)
{
MeasurementDCInfo.LastUsedFont = font;
return(ptr);
}
MeasurementDCInfo.Reset();
}
return(ptr);
}
/// <summary>
/// Selects the specified object into the dc. If the specified object is the same as the one currently selected
/// in the dc, the object is not set and a null value is returned.
/// </summary>
public IntPtr SelectFont(WindowsFont font)
{
// Fonts are one of the most expensive objects to select in an hdc and in many cases we are passed a Font that is the
// same as the one already selected in the dc so to avoid a perf hit we get the hdc font's log font and compare it
// with the one passed in before selecting it in the hdc.
// Also, we avoid performing GDI operations that if done on an enhanced metafile DC would add an entry to it, hence
// reducing the size of the metafile.
if (font.Equals(Font))
{
return(IntPtr.Zero);
}
IntPtr result = SelectObject(font.Hfont, GdiObjectType.Font);
WindowsFont previousFont = selectedFont;
selectedFont = font;
hCurrentFont = font.Hfont;
// the measurement DC always leaves fonts selected for pref reasons.
// in this case, we need to diposse the font since the original
// creator didn't fully dispose.
if (previousFont != null)
{
if (MeasurementDCInfo.IsMeasurementDC(this))
{
previousFont.Dispose();
}
}
#if OPTIMIZED_MEASUREMENTDC
// once we've changed the font, update the last used font.
if (MeasurementDCInfo.IsMeasurementDC(this))
{
if (result != IntPtr.Zero)
{
MeasurementDCInfo.LastUsedFont = font;
}
else
{
// there was an error selecting the Font into the DC, we dont know anything about it.
MeasurementDCInfo.Reset();
}
}
#endif
return(result);
}
public IntPtr SelectFont(WindowsFont font)
{
if (font.Equals(this.Font))
{
return IntPtr.Zero;
}
IntPtr ptr = this.SelectObject(font.Hfont, GdiObjectType.Font);
WindowsFont selectedFont = this.selectedFont;
this.selectedFont = font;
this.hCurrentFont = font.Hfont;
if ((selectedFont != null) && MeasurementDCInfo.IsMeasurementDC(this))
{
selectedFont.Dispose();
}
if (MeasurementDCInfo.IsMeasurementDC(this))
{
if (ptr != IntPtr.Zero)
{
MeasurementDCInfo.LastUsedFont = font;
return ptr;
}
MeasurementDCInfo.Reset();
}
return ptr;
}
