Consider generating fallback JPEG/PNG when a WebP/AVIF is uploaded originally

[westonruter]

Feature Description

This was raised by @webd-uk in a support forum topic: Open Graph protocol does not support webp.

I thought what was being requested was something that was already implemented (cf. #2028) where outputting modern image formats is skipped during wp_head for the sake of social providers that don't support them (e.g. Open Graph).

However, the issue is rather if you uploads a WebP or AVIF from the beginning (as WordPress now supports). In this case, the plugin won't need to do anything since a modern image format is the original format. In this case, there's no JPEG/PNG to fall back to render in wp_head.

Perhaps this plugin should support site owners who are already using WebP/AVIF images by generating the JPEG/PNG both for use in wp_head and also for PICTURE element fallbacks.

[masvil]

At first glance it might seem anachronistic, but… you've explained well why it's needed. +1

[webd-uk]

Thank you! We have developed a (probably rudimental by your standards) wrapper function for wp_get_attachment_image_url() to resolve this issue for us which generates a .jpg if one doesn't exist and saves it into the attachment metadata for future use. If you'd like me to share it, let me know.

Oliver