Alex Vandiver b14a33c659 thumbnailing: Switch to libvips, from PIL/pillow. ...

This is done in as much of a drop-in fashion as possible.  Note that
libvips does not support animated PNGs[^1], and as such this
conversion removes support for them as emoji; however, libvips
includes support for webp images, which future commits will take
advantage of.

This removes the MAX_EMOJI_GIF_SIZE limit, since that existed to work
around bugs in Pillow.  MAX_EMOJI_GIF_FILE_SIZE_BYTES is fixed to
actually be 128KiB (not 128MiB, as it actually was), and is counted
_after_ resizing, since the point is to limit the amount of data
transfer to clients.

[^1]: https://github.com/libvips/libvips/discussions/2000

2024-06-26 16:42:57 -07:00

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