fastmath.java

Android平台上的media player, iPhone风格

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.internal.util;

/**
 * Fast and loose math routines.
 */
public class FastMath {

    /**
     * Fast round from float to int. This is faster than Math.round()
     * thought it may return slightly different results. It does not try to
     * handle (in any meaningful way) NaN or infinities.
     */
    public static int round(float x) {
        long lx = (long)(x * (65536 * 256f));
        return (int)((lx + 0x800000) >> 24);
    }
}