~canonical-dx-team/unity/unity.fix-ql-losing-focus

/*

 * Copyright (C) 2010 Canonical Ltd

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 3 as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 *

 * Authored by Gordon Allott <gord.allott@canonical.com>

 */

#ifndef TEXTURECACHE_H

#define TEXTURECACHE_H

#include <Nux/Nux.h>

#include <string>

#include <map>

#include <vector>

#include <sigc++/sigc++.h>

/* Basically a nice simple texture cache system, you ask the cache for a texture by id

 * if the texture does not exist it calls the callback function you provide it with to create the

 * texture, then returns it.

 * you should remember to ref/unref the textures yourself however

 */

class TextureCache

{

public:

  // id, width, height, texture 

  typedef sigc::slot<void, const char *, int, int, nux::BaseTexture **> CreateTextureCallback;

  /* don't new this class, use getdefault */

  static TextureCache * GetDefault ();

  nux::BaseTexture * FindTexture (const char *texture_id, int width, int height, CreateTextureCallback callback);

protected:

  TextureCache ();

  ~TextureCache ();

  char * Hash (const char *id, int width, int height);

  std::map<std::string, nux::BaseTexture *> _cache;

  std::map<nux::BaseTexture *, std::string> _cache_inverse; // just for faster lookups

  void OnDestroyNotify (nux::Trackable *Object);

};

#endif // TEXTURECACHE_H