/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
// Get rid of this font from its factory cache when its disposed. Otherwise it'll live on in a half initialized state.
Factory?.UnregisterFont(this);
foreach (GorgonTexture2D texture in _internalTextures)
{
texture?.Dispose();
}
var brush = _info.Brush as IDisposable;
brush?.Dispose();
_internalTextures.Clear();
KerningPairs.Clear();
Glyphs.Clear();
}
/// <summary>
/// Function to retrieve the built in kerning pairs and advancement information for the font.
/// </summary>
/// <param name="graphics">The GDI graphics interface.</param>
/// <param name="font">The GDI font.</param>
/// <param name="allowedCharacters">The list of characters available to the font.</param>
private Dictionary <char, ABC> GetKerningInformation(System.Drawing.Graphics graphics, Font font, IList <char> allowedCharacters)
{
Dictionary <char, ABC> advancementInfo;
KerningPairs.Clear();
IntPtr prevGdiHandle = Win32API.SetActiveFont(graphics, font);
try
{
advancementInfo = Win32API.GetCharABCWidths(allowedCharacters[0], allowedCharacters[allowedCharacters.Count - 1]);
if (!Info.UseKerningPairs)
{
return(advancementInfo);
}
IList <KERNINGPAIR> kerningPairs = Win32API.GetKerningPairs();
foreach (KERNINGPAIR pair in kerningPairs.Where(item => item.KernAmount != 0))
{
var newPair = new GorgonKerningPair(Convert.ToChar(pair.First), Convert.ToChar(pair.Second));
if ((!allowedCharacters.Contains(newPair.LeftCharacter)) ||
(!allowedCharacters.Contains(newPair.RightCharacter)))
{
continue;
}
KerningPairs[newPair] = pair.KernAmount;
}
}
finally
{
Win32API.RestoreActiveObject(prevGdiHandle);
}
return(advancementInfo);
}