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engines/titanic/star_control/surface_fader.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/>.
+ *
+ */
+
+#ifndef TITANIC_SURFACE_FADER_H
+#define TITANIC_SURFACE_FADER_H
+
+#include "common/scummsys.h"
+
+namespace Titanic {
+
+class CVideoSurface;
+class CScreenManager;
+class CSurfaceArea;
+
+class CSurfaceFader {
+private:
+	byte *_dataP;
+	bool _fadeIn;
+private:
+	/**
+	 * Create a faded version of the source surface for the new step
+	 */
+	void step(CSurfaceArea &srcSurface, CSurfaceArea &destSurface);
+
+	/**
+	 * Sets up an internal surface to match the size of the specified one
+	 */
+	bool setupSurface(CScreenManager *screenManager, CVideoSurface *srcSurface);
+public:
+	int _index;
+	int _count;
+	CVideoSurface *_videoSurface;
+public:
+	CSurfaceFader();
+	~CSurfaceFader();
+
+	/**
+	 * Reset fading back to the start
+	 */
+	void reset();
+
+	/**
+	 * Creates a faded version of the passed source surface, based on a percentage
+	 * visibility specified by _index of _count
+	 */
+	CVideoSurface *draw(CScreenManager *screenManager, CVideoSurface *srcSurface);
+
+	/**
+	 * Sets whether a fade in (versus a fade out) should be done
+	 */
+	void setFadeIn(bool fadeIn);
+
+	/**
+	 * Returns true if a fade is in progress
+	 */
+	bool isActive() const { return _index >= 0 && _index < _count; }
+};
+
+} // End of namespace Titanic
+
+#endif /* TITANIC_SURFACE_SHADER_H */