public static Gdi32Font GetPoolingFont(string faceName, FontSizeUnit fontSizeUnit, float size, Gdi32FontStyleInfo fontStyle, byte charSet, Gdi32FontQuality fontQuality)
{
lock (FontCache)
{
var key = Gdi32Font.ToFontCacheKey(faceName, fontSizeUnit, size, fontStyle, charSet, fontQuality);
var font = new Gdi32Font(key);
for (var node = FontCache.First; node != null; node = node.Next)
{
if (node.Value.Key == key)
{
if (FontCache.First != node)
{
FontCache.Remove(node);
FontCache.AddFirst(node);
}
return(font);
}
}
FontCache.AddFirst(new FontCacheEntry(key, font));
while (FontCache.Count > 20)
{
var lastNode = FontCache.Last;
lastNode.Value.Font.Dispose();
FontCache.Remove(lastNode);
}
return(font);
}
}
public FontCacheEntry(Gdi32Font.FontCacheKey key, Gdi32Font font)
{
Key = key ?? throw new ArgumentNullException(nameof(key));
Font = font ?? throw new ArgumentNullException(nameof(font));
}