Feature: #90416 - Specific target file extension in image-related ViewHelpers

See forge#90416

Description

TYPO3 core's shipped Fluid ViewHelpers now allow to optionally specify a target file extension via the new attribute fileExtension.

This affects the following ViewHelpers:

• <f:image>

• <f:media>

• <f:uri.image>

This is rather important for specific scenarios where a <picture> tag with multiple images are requested, allowing to e.g. customize rendering for webp support, if the servers' ImageMagick version supports webp conversion.

In other regard, this might become useful to specify the output for preview images of pdf files which can be converted via GhostScript if installed.

Impact

TYPO3 Integrators can now use the additional attribute in their custom Fluid Templates for specific use cases.

Example:

<picture>
  <source srcset="{f:uri.image(image: fileObject, treatIdAsReference: true, fileExtension: 'webp')}" type="image/webp">
  <source srcset="{f:uri.image(image: fileObject, treatIdAsReference: true, fileExtension: 'jpg')}" type="image/jpeg">
  <f:image image="{fileObject}" treatIdAsReference="true" alt="{fileObject.alternative}" />
</picture>