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// -*- Mode: C++; indent-tabs-mode: nil; tab-width: 2 -*-
/*
* Copyright (C) 2010, 2011 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>
* Tim Penhey <tim.penhey@canonical.com>
*/
#ifndef UNITY_TEXTURECACHE_H
#define UNITY_TEXTURECACHE_H
#include <string>
#include <unordered_map>
#include <Nux/Nux.h>
#include <sigc++/trackable.h>
/* A 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
*/
namespace unity
{
class TextureCache : public sigc::trackable
{
public:
typedef nux::ObjectPtr<nux::BaseTexture> BaseTexturePtr;
~TextureCache() = default;
// id, width, height -> texture
typedef std::function<nux::BaseTexture*(std::string const&, int, int)> CreateTextureCallback;
static TextureCache& GetDefault();
static nux::BaseTexture* DefaultTexturesLoader(std::string const&, int, int);
BaseTexturePtr FindTexture(std::string const& texture_id, int width = 0, int height = 0, CreateTextureCallback callback = DefaultTexturesLoader);
void Invalidate(std::string const& texture_id, int width = 0, int height = 0);
// Return the current size of the cache.
std::size_t Size() const;
private:
TextureCache() = default;
std::size_t Hash(std::string const& , int width, int height);
// Have the key passed by value not referece, as the key will be a bound
// parameter in the slot passed to the texture on_destroy signal.
void OnDestroyNotify(nux::Trackable* Object, std::size_t key);
std::unordered_map<std::size_t, nux::BaseTexture*> cache_;
};
}
#endif // TEXTURECACHE_H
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