/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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/>.
 *
 *
 * Based on the original sources
 *   Faery Tale II -- The Halls of the Dead
 *   (c) 1993-1996 The Wyrmkeep Entertainment Co.
 */

#ifndef SAGA2_IMAGCACH_H
#define SAGA2_IMAGCACH_H

namespace Saga2 {

/* ===================================================================== *
   ImageNode class which defines a re-entrant image resource
 * ===================================================================== */

class CImageNode {
private:
	uint32      _contextID;  // ID of context
	uint32      _resourceID;     // RES_ID of  image

	uint16  _requested;  // the number of allocation requests made to node
	void    *_image;     // the image

public:
	CImageNode(hResContext *con, uint32 resID);
	~CImageNode();

	void    *getImagePtr();
	bool    isSameImage(hResContext *con, uint32 resID);
	bool    isSameImage(void *imagePtr);
	uint16  getNumRequested() {
		return _requested;
	}
	bool    releaseRequest();
};


/* ===================================================================== *
   ImageCache class which maintains a list of ImageNodes
 * ===================================================================== */

class CImageCache {
private:
	Common::List<CImageNode *> _nodes;    // list of ImageNode

public:
	CImageCache() {
		assert(_nodes.empty());
	}
	~CImageCache();

	void *requestImage(hResContext *con, uint32 resID);
	void releaseImage(void *);
};

} // end of namespace Saga2

#endif