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uploads: add support for uploading .avif files.

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Features of AVIF include:

* Lossless and lossy compression.
* High dynamic range (HDR) images
* Wide color gamut images (i.e. 10- and 12-bit color depths)
* Transparency (through alpha planes).
* Animations (with an optional cover image).
* Auxiliary image sequences, where the file contains a single primary
  image and a short secondary video, like Apple's Live Photos.
* Metadata rotation, mirroring, and cropping.

The AVIF format is still relatively new and some of these features aren't well
supported by browsers or other software:

* Animated AVIFs aren't supported by Firefox or by libvips.
* HDR images aren't supported by Firefox.
* Rotated, mirrored, and cropped AVIFs aren't supported by Firefox or Chrome.
* Image grids, where the file contains multiple images that are tiled
  together into one big image, aren't supported by Firefox.
* AVIF as a whole has only been supported for a year or two by Chrome
  and Firefox, and less than a year by Safari.

For these reasons, only basic AVIFs that don't use animation, rotation,
cropping, or image grids can be uploaded.
This commit is contained in:
evazion
2022-10-24 19:10:57 -05:00
parent 420ff2f2f5
commit c96d60a840
26 changed files with 197 additions and 15 deletions
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9
test/unit/post_test.rb
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@@ -1217,12 +1217,19 @@ class PostTest < ActiveSupport::TestCase
end
context "a greyscale image missing the greyscale tag" do
should "automatically add the greyscale tag" do
should "automatically add the greyscale tag for a monochrome JPEG file" do
@media_asset = MediaAsset.upload!("test/files/test-grey-no-profile.jpg")
@post.update!(md5: @media_asset.md5)
@post.reload.update!(tag_string: "tagme")
assert_equal("greyscale tagme", @post.tag_string)
end
should "automatically add the greyscale tag for a monochrome AVIF file" do
@media_asset = MediaAsset.upload!("test/files/avif/fox.profile0.8bpc.yuv420.monochrome.avif")
@post.update!(md5: @media_asset.md5)
@post.reload.update!(tag_string: "tagme")
assert_equal("greyscale tagme", @post.tag_string)
end
end
context "an exif-rotated image missing the exif_rotation tag" do