index/src/Colour/ColourRGB.php

<?php
namespace Index\Colour;

class ColourRGB extends Colour {
    private int $red;
    private int $green;
    private int $blue;
    private float $alpha;

    public function __construct(int $red, int $green, int $blue, float $alpha) {
        $this->red = max(0, min(255, $red));
        $this->green = max(0, min(255, $green));
        $this->blue = max(0, min(255, $blue));
        $this->alpha = max(0.0, min(1.0, $alpha));
    }

    public function getRed(): int {
        return $this->red;
    }

    public function getGreen(): int {
        return $this->green;
    }

    public function getBlue(): int {
        return $this->blue;
    }

    public function getAlpha(): float {
        return $this->alpha;
    }

    public function shouldInherit(): bool {
        return false;
    }

    public function __toString(): string {
        if($this->alpha < 1.0)
            return sprintf('rgba(%d, %d, %d, %.3F)', $this->red, $this->green, $this->blue, $this->alpha);
        return sprintf('#%02x%02x%02x', $this->red, $this->green, $this->blue);
    }

    public static function fromRawRGB(int $raw): ColourRGB {
        return new ColourRGB(
            (($raw >> 16) & 0xFF),
            (($raw >> 8) & 0xFF),
            ($raw & 0xFF),
            1.0
        );
    }

    public static function fromRawARGB(int $raw): ColourRGB {
        return new ColourRGB(
            (($raw >> 16) & 0xFF),
            (($raw >> 8) & 0xFF),
            ($raw & 0xFF),
            (($raw >> 24) & 0xFF) / 255.0,
        );
    }

    public static function fromRawRGBA(int $raw): ColourRGB {
        return new ColourRGB(
            (($raw >> 24) & 0xFF),
            (($raw >> 16) & 0xFF),
            (($raw >> 8) & 0xFF),
            ($raw & 0xFF) / 255.0,
        );
    }

    public static function convert(Colour $colour): ColourRGB {
        if($colour instanceof ColourRGB)
            return $colour;
        return new ColourRGB(
            $colour->getRed(),
            $colour->getGreen(),
            $colour->getBlue(),
            $colour->getAlpha()
        );
    }
}