- fixed MapViewPosition scaleMap

- fixed GLRender isVisible() for proxy tiles
- smoother scale animation

src/org/oscim/utils/FastMath.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2012 Hannes Janetzek
+ *
+ * This program is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.oscim.utils;
+
+public class FastMath {
+	/**
+	 * from http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog
+	 * 
+	 * @param v
+	 *            ...
+	 * @return ...
+	 */
+	public static int log2(int v) {
+
+		int r = 0; // result of log2(v) will go here
+
+		if ((v & 0xFFFF0000) != 0) {
+			v >>= 16;
+			r |= 16;
+		}
+		if ((v & 0xFF00) != 0) {
+			v >>= 8;
+			r |= 8;
+		}
+		if ((v & 0xF0) != 0) {
+			v >>= 4;
+			r |= 4;
+		}
+		if ((v & 0xC) != 0) {
+			v >>= 2;
+			r |= 2;
+		}
+		if ((v & 0x2) != 0) {
+			r |= 1;
+		}
+		return r;
+	}
+}