Java RGB Color Create rgba(double r, double g, double b, double a)

Description

rgba

License

Open Source License

Declaration

static double rgba(double r, double g, double b, double a) 

Method Source Code

//package com.java2s;
/**// w  ww  .jav a2 s  .c  o m
 * MIT License (MIT)
 *
 * Copyright (c) 2014 Volker Berlin
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * UT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @author Volker Berlin
 * @license: The MIT license <http://opensource.org/licenses/MIT>
 */

public class Main {
    static double rgba(double r, double g, double b, double a) {
        return Double.longBitsToDouble(Math.round(a * 0xFFFF) << 48 | (colorLargeDigit(r) << 32)
                | (colorLargeDigit(g) << 16) | colorLargeDigit(b));
    }

    static double rgba(int r, int g, int b, double a) {
        return Double.longBitsToDouble(Math.round(a * 0xFFFF) << 48 | (colorLargeDigit(r) << 32)
                | (colorLargeDigit(g) << 16) | colorLargeDigit(b));
    }

    private static long colorLargeDigit(double value) {
        value *= 0x100;
        if (value >= 0xFFFF) {
            return 0xFFFF;
        } else if (value <= 0) {
            return 0;
        } else {
            return Math.round(value);
        }
    }
}

Related

1. rgb(int red, int green, int blue)
2. RGB_GREEN(int rgb)
3. RGB_MSE(int[] rgb1, int[] rgb2)
4. RGB_PNSR(int[] rgb1, int[] rgb2)
5. rgb_xyz(double r)
6. RGBA(int r, int g, int b, float a)
7. RGBA(int r, int g, int b, int a)
8. rgba(int red, int green, int blue)
9. rgba_bilinear_filter(int rgb00, int rgb01, int rgb10, int rgb11, int u, int v)