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engines/crab/ui/AlphaImage.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 code is based on the CRAB engine
+ *
+ * Copyright (c) Arvind Raja Yadav
+ *
+ * Licensed under MIT
+ *
+ */
+
+#ifndef CRAB_ALPHAIMAGE_H
+#define CRAB_ALPHAIMAGE_H
+
+#include "crab/image/ImageManager.h"
+#include "crab/ui/element.h"
+
+namespace Crab {
+
+namespace pyrodactyl {
+namespace ui {
+class AlphaImage {
+	// The image used - we don't use the image manager
+	// because we don't change the alpha for those images
+	ImageKey _img;
+
+	// The information for drawing the image
+	Element _pos;
+
+	// The information related to alpha modulation of the image
+	struct AlphaVal {
+		int _cur, _min, _max;
+
+		// Are we increasing or decreasing the alpha
+		bool _inc;
+
+		// By how much do we change the alpha every update
+		int _change;
+
+		AlphaVal() {
+			_cur = 255;
+			_min = 255;
+			_max = 255;
+			_inc = true;
+			_change = 0;
+		}
+	} alpha;
+
+public:
+	AlphaImage() {
+		_img = 0;
+	}
+
+	AlphaImage(rapidxml::xml_node<char> *node) : AlphaImage() {
+		load(node);
+	}
+
+	~AlphaImage() {}
+
+	void load(rapidxml::xml_node<char> *node, const bool &echo = true);
+
+	void draw(const int &xOffset = 0, const int &yOffset = 0);
+
+	// This is used to vary the alpha
+	void internalEvents();
+
+	void setUI() {
+		_pos.setUI();
+	}
+};
+} // End of namespace ui
+} // End of namespace pyrodactyl
+
+} // End of namespace Crab
+
+#endif // CRAB_ALPHAIMAGE_H