vendor/bacon/bacon-qr-code/src/BaconQrCode/Renderer/Image/Png.php

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<?php
/**
 * BaconQrCode
 *
 * @link      http://github.com/Bacon/BaconQrCode For the canonical source repository
 * @copyright 2013 Ben 'DASPRiD' Scholzen
 * @license   http://opensource.org/licenses/BSD-2-Clause Simplified BSD License
 */

namespace BaconQrCode\Renderer\Image;

use BaconQrCode\Exception;
use BaconQrCode\Renderer\Color\ColorInterface;

/**
 * PNG backend.
 */
class Png extends AbstractRenderer
{
    /**
     * Image resource used when drawing.
     *
     * @var resource
     */
    protected $image;

    /**
     * Colors used for drawing.
     *
     * @var array
     */
    protected $colors = array();

    /**
     * init(): defined by RendererInterface.
     *
     * @see    ImageRendererInterface::init()
     * @return void
     */
    public function init()
    {
        $this->image = imagecreatetruecolor($this->finalWidth, $this->finalHeight);
    }

    /**
     * addColor(): defined by RendererInterface.
     *
     * @see    ImageRendererInterface::addColor()
     * @param  string         $id
     * @param  ColorInterface $color
     * @return void
     * @throws Exception\RuntimeException
     */
    public function addColor($id, ColorInterface $color)
    {
        if ($this->image === null) {
            throw new Exception\RuntimeException('Colors can only be added after init');
        }

        $color = $color->toRgb();