KumiScript/renderer/ManagedFont.cs

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C#
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using SDL2;
namespace KumiScript.Renderer
{
public class ManagedFont : IDisposable
{
SDLFont _font;
int _cachesize;
SDL.SDL_Color _color;
SDLRenderer _renderer;
Dictionary<char, Glyph> _glyphs;
LinkedList<char> _incidence;
public ManagedFont(string path, int points, SDL.SDL_Color color, SDLRenderer renderer, int num_cache)
{
_font = new SDLFont(path, points);
_renderer = renderer;
_color = color;
_glyphs = new Dictionary<char, Glyph>();
_incidence = new LinkedList<char>();
_cachesize = num_cache;
}
public Glyph GetGlyph(char c)
{
UpdateFreq(c);
Glyph? g;
if (!_glyphs.TryGetValue(c, out g))
return CacheGlyph(c);
return g;
}
private Glyph CacheGlyph(char c)
{
if (_glyphs.Count >= _cachesize)
PurgeCache();
Glyph g = new Glyph(c, _font, _color, _renderer);
_glyphs.Add(c, g);
return g;
}
private void UpdateFreq(char c)
{
_incidence.Remove(c);
_incidence.AddFirst(c);
return;
}
private void PurgeCache()
{
for (int i = _cachesize - 1; i > _cachesize * .75; i--)
{
char c = _incidence.Last();
Glyph g = _glyphs[c];
_glyphs.Remove(c);
g.Dispose();
_incidence.RemoveLast();
}
return;
}
public void Dispose()
{
List<Glyph> glyphs = _glyphs.Values.ToList();
foreach (Glyph g in glyphs)
g.Dispose();
_font.Dispose();
}
}
}