Breaking: #102009 - imagesizes cache removed

See forge#102009

Description

A cache layer called "imagesizes" was added in 2004 (= TYPO3 3.x) to cache width and height of any kind of images - mostly generated by GIFBuilder or ImageMagick. This was using the PHP function getimagesizes or, if this failed, ImageMagick identify command, which is costly.

In 2012, the new processing layer for File Abstraction Layer (FAL - via "sys_file_processedfile") was introduced with a more modern API, which persists final information about processed images in a separate database table.

Any kind of information processing then is first checked in FAL and then stored again in cache_imagesizes. Some more files, which do not use FAL still utilize this functionality, but the second level cache layer (by default in the database), is unneeded nowadays.

For this reason, the lowlevel cache "imagesizes" is removed along with some methods which were not marked as internal, but marked public:

• TYPO3\CMS\Core\Imaging\GraphicalFunctions->cacheImageDimensions()

• TYPO3\CMS\Core\Imaging\GraphicalFunctions->getCachedImageDimensions()

The main entrypoint TYPO3\CMS\Core\Imaging\GraphicalFunctions->getImageDimensions() is still available but does not use a cache layer anymore.

Impact

Calling the removed public methods will result in a fatal PHP error. In addition, accessing the database table directly or via TYPO3's CacheManager is not possible anymore, as the "imagesizes" cache is removed.

Affected installations

TYPO3 installations which use the cache directly or access these methods directly, which is very very unlikely.

Migration

The now unused database tables are automatically removed when using the database compare update is called. When trying to retrieve image dimensions, the TYPO3\CMS\Core\Type\File\Imageinfo PHP class should be used instead in favor of the main GraphicalFunctions method.

The removed methods should be moved also towards the Imageinfo PHP class.