Use custom paper size

I try to get a custom size paper working with Wkhtmltopdf. I created a new event Subscriber, but it doesn't work because --page-width and --page-height options are not supported, and only setting the paper size using the default_paper_size option is supported.

The subscriber works with:

$update_config = [
 'default_paper_size' => 'A4',
];

But not with:

$update_config = [
  'page_width' => '2.5in',
  'page_height' => '3.5in',
];

Any direction how I can define a custom paper size with Wkhtmltopdf?

I got a quick hard coded solution working.

In /modules/contrib/entity_print/src/Plugin/EntityPrint/PrintEngine/PhpWkhtmlToPdf.php:

    $this->pdf = new Pdf([
      'binary' => $this->configuration['binary_location'],
      'orientation' => $this->configuration['default_paper_orientation'],
      'username' => $this->configuration['username'],
      'password' => $this->configuration['password'],
      'page-size' => $this->configuration['default_paper_size'],
      'zoom' => $this->configuration['zoom'],
      'viewport-size' => $this->configuration['viewport_size'],
      'page-width' => '2in',
      'page-height' => '2in',
    ]);

This could be implemented as a nice feature to the module. I will try to create a patch to propose to merge it, if I can find some time.