Modulate the color to new alpha - Android Graphics

Android examples for Graphics:Color Alpha

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Description

Modulate the color to new alpha

Demo Code

//package com.java2s;

public class Main {
    /**//from w  ww. j a v a  2  s.  co m
     * Modulate the color to new alpha
     *
     * @param color Color
     * @param alpha Modulate alpha
     * @return Modulate alpha color
     */
    public static int modulateColorAlpha(int color, int alpha) {
        int colorAlpha = color >>> 24;
        int scale = alpha + (alpha >> 7);
        int newAlpha = colorAlpha * scale >> 8;
        int r = (color >> 16) & 0xFF;
        int g = (color >> 8) & 0xFF;
        int b = color & 0xFF;
        return newAlpha << 24 | r << 16 | g << 8 | b;
    }
}

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