Silversttripe DOMPDF Image helper

DomPDFHelper.php

<?php

namespace Netwerkstatt\Helper;

use SilverStripe\View\TemplateGlobalProvider;

class DomPDFHelper implements TemplateGlobalProvider
{
    /**
     * @return array
     */
    public static function get_template_global_variables(): array
    {
        return [
            'InlineBase64',
            'Base64'
        ];
    }

    public static function InlineBase64(string $path): string
    {
        $mimeType = mime_content_type(self::getAbsolutePath($path));

        $data = [
            'data:',
            $mimeType,
            ';',
            'base64,',
            self::Base64($path)
        ];

        return implode('', $data);
    }

    public static function Base64($path): string
    {
        $data = file_get_contents(self::getAbsolutePath($path));
        return base64_encode($data);
    }

    public static function getAbsolutePath($path): string
    {
        return implode('/', [BASE_PATH, $path]);
    }
}

In your template you need to call the image with the relative path to your $BASE folder, e.g. project root. like

<img src="$InlineBase64('public/resources/themes/myshop/dist/images/logo.png')" class="logo"/>