Android Color Blend screenBlendTwoColors(int c1, int c2)

Description

Blend of color c1 and c2 by applying f(c1, c2) = 1 - (1 - c1) * (1 - c2) per channel.

License

Open Source License

Parameter

Parameter	Description
c1	first color to blend.
c2	second color to blend.

Return

the result of blending color c1 and c2.

Declaration

public static int screenBlendTwoColors(int c1, int c2) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import android.graphics.Color;

public class Main {
    /**/* ww  w.j  ava 2 s  . com*/
     * Max value for a byte, used for limiting a channels max value.
     */
    public static final int CHANNEL_MAX = 0xff;

    /**
     * Blend of color c1 and c2 by applying f(c1, c2) = 1 - (1 - c1) * (1 - c2)
     * per channel.
     *
     * @param c1 first color to blend.
     * @param c2 second color to blend.
     * @return the result of blending color c1 and c2.
     */
    public static int screenBlendTwoColors(int c1, int c2) {
        double a1 = Color.alpha(c1) / ((double) CHANNEL_MAX);
        double r1 = Color.red(c1) / ((double) CHANNEL_MAX);
        double g1 = Color.green(c1) / ((double) CHANNEL_MAX);
        double b1 = Color.blue(c1) / ((double) CHANNEL_MAX);

        double a2 = Color.alpha(c2) / ((double) CHANNEL_MAX);
        double r2 = Color.red(c2) / ((double) CHANNEL_MAX);
        double g2 = Color.green(c2) / ((double) CHANNEL_MAX);
        double b2 = Color.blue(c2) / ((double) CHANNEL_MAX);

        int a = (int) ((1 - (1 - a1) * (1 - a2)) * CHANNEL_MAX);
        int r = (int) ((1 - (1 - r1) * (1 - r2)) * CHANNEL_MAX);
        int g = (int) ((1 - (1 - g1) * (1 - g2)) * CHANNEL_MAX);
        int b = (int) ((1 - (1 - b1) * (1 - b2)) * CHANNEL_MAX);
        int c = Color.argb(a, r, g, b);

        return c;
    }
}

Related

1. createGrayGradient1()
2. createGrayGradient2()
3. createGrayGradient3()
4. createGreenGradient()