1 files changed, 78 insertions, 0 deletions
diff --git a/engines/titanic/star_control/surface_fader_base.cpp b/engines/titanic/star_control/surface_fader_base.cpp
new file mode 100644
index 0000000000..dfd7c4ab1d
--- /dev/null
+++ b/engines/titanic/star_control/surface_fader_base.cpp
@@ -0,0 +1,78 @@
+/* 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "titanic/star_control/surface_fader_base.h"
+
+namespace Titanic {
+
+CSurfaceFaderBase::CSurfaceFaderBase() : _index(-1), _count(32),
+		_videoSurface(nullptr) {
+}
+
+CSurfaceFaderBase::~CSurfaceFaderBase() {
+	delete _videoSurface;
+}
+
+void CSurfaceFaderBase::reset() {
+	_index = 0;
+}
+
+bool CSurfaceFaderBase::setupSurface(CScreenManager *screenManager, CVideoSurface *srcSurface) {
+	int width = srcSurface->getWidth();
+	int height = srcSurface->getHeight();
+
+	if (_videoSurface) {
+		if (width == _videoSurface->getWidth() && _videoSurface->getHeight())
+			// Allocated surface already matches new size
+			return true;
+
+		// Different sizes, so delete old surface
+		delete _videoSurface;
+	}
+
+	_videoSurface = screenManager->createSurface(width, height);
+	return true;
+}
+
+CVideoSurface *CSurfaceFaderBase::fade(CScreenManager *screenManager, CVideoSurface *srcSurface) {
+	if (_index == -1 || _index >= _count)
+		return srcSurface;
+
+	if (!_count && !setupSurface(screenManager, srcSurface))
+		return nullptr;
+
+	srcSurface->lock();
+	_videoSurface->lock();
+	CSurfaceArea srCSurfaceArea(srcSurface);
+	CSurfaceArea destSurfaceObj(_videoSurface);
+
+	// Copy the surface with fading
+	copySurface(srCSurfaceArea, destSurfaceObj);
+
+	srcSurface->unlock();
+	_videoSurface->unlock();
+	
+	++_index;
+	return _videoSurface;
+}
+
+} // End of namespace Titanic