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engines/saga2/imagcach.h

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+/* 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