pyrou/morpheus

<?php

namespace Morpheus;

class Color {

    public $r;
    public $g;
    public $b;
    public $a;

    /**
     * @param integer $red       Red value 0-255
     * @param integer $green     Green value 0-255
     * @param integer $blue      Blue value 0-255
     * @param integer $alpha      Alpha value 0-255
     */
    function __construct($red, $green, $blue, $alpha = 0) {
        $this->r = $red;
        $this->g = $green;
        $this->b = $blue;
        $this->a = $alpha;
    }

    /**
     * Write a 3-bits-length integer in color
     * @param integer $value    Integer value between 0 (0b000) and 7 (0b111)
     */
    function writeBits($value) {
        $this->r = ($this->r & 0xFE) + ($value >> 2 & 1);
        $this->g = ($this->g & 0xFE) + ($value >> 1 & 1);
        $this->b = ($this->b & 0xFE) + ($value >> 0 & 1);
        /* // debug colors
        $this->r = 0;
        $this->g = $value << 5;
        $this->b = 0;
        $this->a = 1;
        /**/
    }

    /**
     * Read 3-bits-length integer from color
     * @return integer     Integer value between 0 (0b000) and 7 (0b111)
     */
    function readBits() {
        $value  = ($this->r & 1) << 2;
         $value += ($this->g & 1) << 1;
         $value += ($this->b & 1) << 0;

        return $value;
    }
}