| /* Fixed.java -- Fixed-point arithmetics for TrueType coordinates. |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath 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 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.awt.font.opentype.truetype; |
| |
| |
| /** |
| * A utility class for fixed-point arithmetics, where numbers are |
| * represented with 26 dot 6 digits. This representation is used by |
| * TrueType coordinates. |
| * |
| * <p>A good compiler will inline calls of methods in this class. |
| * |
| * @author Sascha Brawer (brawer@dandelis.ch) |
| */ |
| final class Fixed |
| { |
| public static final int ONE = 1<<6; |
| |
| |
| /** |
| * The constructor is private so nobody can use it. |
| */ |
| private Fixed() |
| { |
| } |
| |
| |
| /** |
| * Multiplies two fixed-point numbers. |
| */ |
| public static int mul(int a, int b) |
| { |
| return (int) ((((long) a) * b) >> 6); |
| } |
| |
| |
| public static int div(int a, int b) |
| { |
| return (int) ((((long) a) << 6) / b); |
| } |
| |
| |
| |
| public static int ceil(int a) |
| { |
| return (a + 63) & -64; |
| } |
| |
| |
| public static int floor(int a) |
| { |
| return a & -64; |
| } |
| |
| |
| /** |
| * Calculates the length of a fixed-point vector. |
| */ |
| public static int vectorLength(int x, int y) |
| { |
| int shift; |
| float fx, fy; |
| |
| if (x == 0) |
| return Math.abs(y); |
| else if (y == 0) |
| return Math.abs(x); |
| |
| /* Use the FPU. */ |
| fx = ((float) x) / 64.0f; |
| fy = ((float) y) / 64.0f; |
| return (int) (Math.sqrt(fx * fx + fy * fy) * 64.0); |
| } |
| |
| |
| public static int intValue(int f) |
| { |
| return f >> 6; |
| } |
| |
| |
| public static float floatValue(int f) |
| { |
| return ((float) f) / 64; |
| } |
| |
| |
| public static double doubleValue(int f) |
| { |
| return ((double) f) / 64; |
| } |
| |
| |
| public static int valueOf(float f) |
| { |
| return (int) (f * 64); |
| } |
| |
| |
| public static int valueOf(double d) |
| { |
| return (int) (d * 64); |
| } |
| |
| |
| /** |
| * Makes a string representation of a fixed-point number. |
| */ |
| public static String toString(int f) |
| { |
| return String.valueOf(floatValue(f)); |
| } |
| |
| |
| public static String toString(int x, int y) |
| { |
| StringBuffer sbuf = new StringBuffer(40); |
| sbuf.append('('); |
| sbuf.append(((float) x) / 64); |
| sbuf.append(", "); |
| sbuf.append(((float) y) / 64); |
| sbuf.append(')'); |
| return sbuf.toString(); |
| } |
| } |