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engines/lab/utils.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 Labyrinth of Time code with assistance of
+ *
+ * Copyright (c) 1993 Terra Nova Development
+ * Copyright (c) 2004 The Wyrmkeep Entertainment Co.
+ *
+ */
+
+#ifndef LAB_UTILS_H
+#define LAB_UTILS_H
+
+namespace Lab {
+
+class Utils {
+private:
+	LabEngine *_vm;
+	uint16 _dataBytesPerRow;
+
+	/**
+	 * Undiffs a piece of memory based on the header size.
+	 */
+	template<typename T>
+	void unDiff(T *dest, Common::File *sourceFile);
+
+	/**
+	 * Undiffs a piece of memory when header size is a byte, and copy/skip size
+	 * is a byte or a word or a double word.
+	 */
+	template<typename T>
+	void verticalUnDiff(T *dest, Common::File *sourceFile, uint16 bytesPerRow);
+
+public:
+	Utils(LabEngine *vm);
+
+	Common::RandomSource _rnd;
+
+	/**
+	 * Scales the x co-ordinates to that of the new display.  In the room parser
+	 * file, co-ordinates are set up on a 360x336 display.
+	 */
+	uint16 scaleX(uint16 x);
+
+	/**
+	 * Scales the y co-ordinates to that of the new display.  In the room parser
+	 * file, co-ordinates are set up on a 368x336 display.
+	 */
+	uint16 scaleY(uint16 y);
+	Common::Rect rectScale(int16 x1, int16 y1, int16 x2, int16 y2);
+
+	/**
+	 * Scales the VGA x coords to SVGA if necessary; otherwise, returns VGA coords.
+	 */
+	int16 vgaScaleX(int16 x);
+
+	/**
+	 * Scales the VGA y coords to SVGA if necessary; otherwise, returns VGA coords.
+	 */
+	int16 vgaScaleY(int16 y);
+	Common::Rect vgaRectScale(int16 x1, int16 y1, int16 x2, int16 y2);
+	uint16 svgaCord(uint16 cord);
+	uint16 mapScaleX(uint16 x);
+	uint16 mapScaleY(uint16 y);
+	Common::Rect mapRectScale(int16 x1, int16 y1, int16 x2, int16 y2);
+
+	/**
+	 * Converts SVGA coords to VGA if necessary, otherwise returns VGA coords.
+	 */
+	Common::Point vgaUnscale(Common::Point pos);
+
+	/**
+	 * Does the undiffing between the bitmaps.
+	 */
+	void unDiff(byte *newBuf, byte *oldBuf, Common::File *sourceFile, uint16 bytesPerRow, bool isVertical);
+	void runLengthDecode(byte *dest, Common::File *sourceFile);
+	void verticalRunLengthDecode(byte *dest, Common::File *sourceFile, uint16 bytesPerRow);
+	void setBytesPerRow(int num);
+	uint16 getRandom(uint16 max);
+};
+
+
+} // End of namespace Lab
+
+#endif // LAB_UTILS_H