Multiplies the color with the given alpha. - Android Graphics

Android examples for Graphics:Color Alpha

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Description

Multiplies the color with the given alpha.

Demo Code

/**//from   www .  ja  v  a 2  s .  co m
 * Copyright (c) 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */
//package com.java2s;

public class Main {
    /**
     * Multiplies the color with the given alpha.
     * @param color color to be multiplied
     * @param alpha value between 0 and 255
     * @return multiplied color
     */
    public static int multiplyColorAlpha(int color, int alpha) {
        if (alpha == 255) {
            return color;
        }
        if (alpha == 0) {
            return color & 0x00FFFFFF;
        }
        alpha = alpha + (alpha >> 7); // make it 0..256
        int colorAlpha = color >>> 24;
        int multipliedAlpha = colorAlpha * alpha >> 8;
        return (multipliedAlpha << 24) | (color & 0x00FFFFFF);
    }
}

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