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The Adobe Experience Manager SDK

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/*
 * File: F2Dot14.java
 * 
 *	ADOBE CONFIDENTIAL
 *	___________________
 *
 *	Copyright 2005 Adobe Systems Incorporated
 *	All Rights Reserved.
 *
 *	NOTICE: All information contained herein is, and remains the property of
 *	Adobe Systems Incorporated and its suppliers, if any. The intellectual
 *	and technical concepts contained herein are proprietary to Adobe Systems
 *	Incorporated and its suppliers and may be covered by U.S. and Foreign
 *	Patents, patents in process, and are protected by trade secret or
 *	copyright law. Dissemination of this information or reproduction of this
 *	material is strictly forbidden unless prior written permission is
 *      obtained from Adobe Systems Incorporated.
 *
 */

package com.adobe.fontengine.math;

import com.adobe.agl.text.DecimalFormat;

/** Constants and operations on fixed 2.14 numbers.
 * 
 * The value v is represented by the int value
 * 2^14 * v.
 */

public final class F2Dot14 {
  public static final int /*2.14*/ ZERO = 0x00;
  public static final int /*2.14*/ ONE = 0x4000;
  public static final int /*2.14*/ ONE_SIXTEENTH = 0x400;
  
  private static int clamp (long x) {
    if (x > 32767) {
      return 32767; }
    else if (x < -32768) {
      return -32768; }
    else {
      return (int) x; }
  }
  
  public static int /*2.14*/ multiply (int /*2.14*/ v1, int /*2.14*/ v2) {
    return clamp (((((long) v1 * (long) v2) >> 13) + 1) >> 1);
  }
  
  public static int /*2.14*/ square (int /*2.14*/ v) {
    return multiply (v, v);
  }
  
  public static int /*2.14*/ fromDouble (double v) {
    return (int) (v * ONE);
  }
  
  public static double toDouble (int /*2.14*/ v) {
    return ((double) v) / ONE;
  }
  

  
  private final static DecimalFormat df = new DecimalFormat ("0.###");
  
  public static String toString (int /*2.14*/ v) {
    return df.format (toDouble (v));
  }
}