[3.0] Fixes using ActiveStorage adapter with libvips as variant processor #4325
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[Rails 6.0 introduced](https://github.com/rails/rails/blob/6-0-stable/activestorage/CHANGELOG.md#rails-600beta1-january-18-2019) the option of using libvips as an alternative to imagemagick as a backend image processor. Both processors are handled using the [image_processing](https://github.com/janko/image_processing) library as adapter. However, the API for both is not fully compatible. What it's important for us when generating a variant, the `strip` option needs to be within the `saver` group to work with both adapters. See https://gist.github.com/brenogazzola/a4369965a1da426d50f11d080fe2e563#1-move-everything-that-has-to-do-with-compression-to-a-saver-hash for details. We also need to explicitly coerce size values to integers for libvips. We're also allowing to run tests with that adapter by setting the `ACTIVE_STORAGE_VARIANT_PROCESSOR` env variable. However, we still default it to `:mime_magick` (Ruby's wrapper for imagemagick), Rail's default previous to 7.0. We'll update it once we integrate support for Rails 7.0. I also manually tested that metadata is still stripped when using both adapters.
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Apr 1, 2022
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Backports #4317
Rails 6.0 introduced the option of using libvips as an alternative to imagemagick as a backend image processor.
Both processors are handled using the image_processing library as adapter. However, the API for both is not fully compatible. What it's important for us when generating a variant, the
stripoption needs to be within thesavergroup to work with both adapters. See https://gist.github.com/brenogazzola/a4369965a1da426d50f11d080fe2e563#1-move-everything-that-has-to-do-with-compression-to-a-saver-hashfor details. We also need to explicitly coerce size values to integers for libvips.
We're also allowing to run tests with that adapter by setting the
ACTIVE_STORAGE_VARIANT_PROCESSORenv variable. However, we still default it to:mime_magick(Ruby's wrapper for imagemagick), Rail's default previous to 7.0. We'll update it once we integrate support for Rails 7.0.I also manually tested that metadata is still stripped when using both
adapters.
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