com.adobe.fontengine.math.F16Dot16 Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of aem-sdk-api Show documentation
The Adobe Experience Manager SDK
There is a newer version: 2024.11.18751.20241128T090041Z-241100
/*
 * File: F16Dot16.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 16.16 numbers.
 * 
 * The value v is represented by the int value
 * 2^16 * v.
 */

public class F16Dot16 {
  public static final int /*16.16*/ ZERO = 0;
  public static final int /*16.16*/ ONE = 1 << 16;
  public static final int /*16.16*/ ONE_HALF = ONE / 2;
 
  /** Clamp a long value to the int range.*/
  static private int clamp (long x) {
    if (x > Integer.MAX_VALUE) {
      return Integer.MAX_VALUE; }
    else if (x < Integer.MIN_VALUE) {
      return Integer.MIN_VALUE; }
    else {
      return (int) x; }
  }
  
  /** Truncate the decimal part of a 16.16, result is a 16.16. */
  public static int /*16.16*/ truncate (int /*16.16*/ v) {
    return v & 0xffff0000;
  }
  
  /** Multiply two 16.16, result is a 16.16. */
  public static int /*16.16*/ multiply (int /*16.16*/ v1, int /*16.16*/ v2) {
    return clamp (((long) v1 * (long) v2) >> 16);
  }
 
  /** Square of a 16.16, result is a 16.16. */
  public static int /*16.16*/ square (int /*16.16*/ v) {
    return multiply (v, v);
  }
  
  /** Multiply a 16.16 by a 2.14, result is 16.16. */
  public static int /*16.16*/ multiplyByF2Dot14 (int /*16.16*/ v1, int /*2.14*/ v2) {
    return clamp (((((long) v1 * (long) v2) >> 13) + 1) >> 1);
  }
  
  /** Multiply a 16.16 by a 16.16 and divive by a 16.16, result is a 16.16. */
  public static int /*16.16*/ multiplyDivide (int /*16.16*/ v1, int /*16.16*/ v2, int /*16.16*/ v3) {
    long numerator = ((long) v1) * ((long) v2);
    long denominator = v3;
    boolean negate = false;
    if (numerator < 0) {
      numerator = - numerator;
      negate = ! negate; }
    if (denominator < 0) {
      denominator = - denominator;
      negate = ! negate; }
    long v = (numerator + denominator / 2) / denominator;
    if (negate) {
      return clamp (-v); }
    else {
      return clamp (v); }
  }
  
  /** Divide a 16.16 by a 16.16, result is a 16.16. */
  public static int /*16.16*/ divide (int /*16.16*/ v1, int /*16.16*/ v2) {
    return clamp ((((long) v1 << 16) / v2));
  }
  
  /** Round a 16.16, half-up , result is a 16.16. */
  public static int /*16.16*/ round (int /*16.16*/ v) {
    return truncate (v + ONE_HALF);
  }
  
  /** Convert a 16.16 to a double. */
  public static double toDouble (int /*16.16*/ v) {
    return ((double) v) / 0x10000;
  }
  
  /** Convert a double to a 16.16. */
  public static int /*16.16*/ fromDouble (double v) {
    return (int) (v * ONE);
  }
  
  /** Convert an int to a 16.16. */
  public static int /*16.16*/ fromInt (int v) {
    return v << 16;
  }
  
  
  private final static DecimalFormat df = new DecimalFormat ("0.###");
  
  /** Convert a 16.16 to a decimal representation. */
  public static String toString (int /*16.16*/ v) {
    return df.format (toDouble (v));
  }
}