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engines/darkseed/morph.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 "darkseed/morph.h"
+#include "darkseed/darkseed.h"
+
+namespace Darkseed {
+
+Morph::Morph(const Common::Rect &area) : _area(area) {}
+void Morph::loadSrcFromScreen() {
+	_src.copyFrom(*(Graphics::ManagedSurface *)g_engine->_screen);
+}
+
+void Morph::loadDestFromScreen() {
+	_dest.copyFrom(*(Graphics::ManagedSurface *)g_engine->_screen);
+}
+
+void Morph::start(MorphDirection direction) {
+	_stepCount = 0;
+	_direction = direction;
+}
+
+bool Morph::morphStep() {
+	if (_stepCount > 16) {
+		return false;
+	}
+	draw(_direction == MorphDirection::Forward ? _stepCount : 16 - _stepCount);
+	_stepCount += 1;
+	return _stepCount < 17;
+}
+
+void Morph::draw(int16 drawIdx) {
+	uint8 *screen = (uint8 *)g_engine->_screen->getBasePtr(_area.left, _area.top);
+	uint8 *src = (uint8 *)_src.getBasePtr(_area.left, _area.top);
+	uint8 *dest = (uint8 *)_dest.getBasePtr(_area.left, _area.top);
+
+	for (int y = 0; y < _area.height(); y++) {
+		for (int x = 0; x < _area.width(); x++) {
+			if (src[x] != dest[x]) {
+				screen[x] = (src[x] * (16 - drawIdx) + dest[x] * drawIdx) >> 4;
+			}
+		}
+		screen += g_engine->_screen->pitch;
+		src += _src.pitch;
+		dest += _dest.pitch;
+	}
+	g_engine->_screen->addDirtyRect(_area);
+}
+
+} // End of namespace Darkseed