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engines/gob/backbuffer.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/>.
+ *
+ *
+ * This file is dual-licensed.
+ * In addition to the GPLv3 license mentioned above, this code is also
+ * licensed under LGPL 2.1. See LICENSES/COPYING.LGPL file for the
+ * full text of the license.
+ *
+ */
+
+#ifndef GOB_BACKBUFFER_H
+#define GOB_BACKBUFFER_H
+
+#include "common/system.h"
+
+namespace Gob {
+
+class Surface;
+
+class BackBuffer {
+public:
+	BackBuffer();
+	~BackBuffer();
+
+protected:
+	void trashBuffer();
+	void resizeBuffer(uint16 width, uint16 height);
+
+	bool saveScreen   (const Surface &dest, int16 &left, int16 &top, int16 &right, int16 &bottom);
+	bool restoreScreen(      Surface &dest, int16 &left, int16 &top, int16 &right, int16 &bottom);
+
+	bool hasBuffer() const;
+	bool hasSavedBackground() const;
+
+private:
+	Surface *_background; ///< The saved background.
+	bool _saved;          ///< Was the background saved?
+
+	int16 _saveLeft;   ///< The left position of the saved background.
+	int16 _saveTop;    ///< The top of the saved background.
+	int16 _saveRight;  ///< The right position of the saved background.
+	int16 _saveBottom; ///< The bottom position of the saved background.
+};
+
+} // End of namespace Gob
+
+#endif // GOB_BACKBUFFER_H