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engines/titanic/support/transparency_surface.cpp

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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/>.
+ *
+ */
+
+#include "titanic/support/transparency_surface.h"
+#include "common/algorithm.h"
+#include "common/textconsole.h"
+
+namespace Titanic {
+
+CTransparencySurface::CTransparencySurface(const Graphics::Surface *surface,
+		TransparencyMode transMode) : _surface(surface) {
+	_pitch = 0;
+	_runLength = 0;
+	_flag = false;
+	_opaqueColor = 0;
+	_transparentColor = 0xff;
+
+	switch (transMode) {
+	case TRANS_MASK0:
+	case TRANS_ALPHA0:
+		_transparentColor = 0;
+		_opaqueColor = 0xff;
+		break;
+	case TRANS_MASK255:
+	case TRANS_ALPHA255:
+		_transparentColor = 0xff;
+		_opaqueColor = 0;
+		break;
+	case TRANS_DEFAULT:
+		// If top left pixel is low, then 0 is the transparent color
+		if (*(const byte *)surface->getPixels() < 0x80) {
+			_opaqueColor = 0xff;
+			_transparentColor = 0;
+		}
+		break;
+	default:
+		break;
+	}
+}
+
+} // End of namespace Titanic