Specifying image width and/or height for OPDS 2.0?

[mikespub]

What happened?

In OPDS 2.0 images MAY include any number of image format, resolution or aspect ratio - see https://drafts.opds.io/opds-2.0#23-images

The current php-opds implementation uses hard-coded values for width and height:

php-opds/src/Engine/OpdsJsonEngine.php

Line 173 in 790eec9

['href' => $entry->getMediaThumbnail() ?? '', 'type' => 'image/jpeg', 'height' => 700, 'width' => 400],

We should either support getting the image size in that method, and/or allow some way to pass along that information in OpdsEntryNavigation and OpdsEntryBook - right now the constructor uses ?string

php-opds/src/Entries/OpdsEntryBook.php

Line 23 in 790eec9

protected ?string $mediaThumbnail = null,

How to reproduce the bug

Generate OPDS 2.0 feed

Package Version

2.1.0

PHP Version

8.2

Which operating systems does with happen with?

Linux

Notes

Nothing urgent, but I noticed that on Android the Readium demo app didn't like showing images on a small device with OPDS 2.0. I'm not sure if the width/height is the issue or something else...