perf(preview): decode the max preview at a reduced size with Imagick - #65149
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Small previews like the 64px and 256px ones of the files list and grid view were resized from the fully decoded max preview, a 12 MP image for a camera photo. libjpeg can scale by 1/2, 1/4 or 1/8 while decoding: with Imagick, decoding a 12 MP JPEG this way takes about 30ms instead of about 90ms with GD, and the resize then starts from a 500x380 px image instead of a 4032x3024 px one. Use it when Imagick is available and the requested preview is at most 1/8 of the max preview, otherwise decode the full max preview as before. Assisted-by: ClaudeCode:claude-opus-5-5 Signed-off-by: Carl Schwan <carl@carlschwan.eu>
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CarlSchwan
added this pull request to stack #65162
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Summary
Small previews like the 64px and 256px ones of the files list and grid view were resized from the fully decoded max preview, a 12 MP image for a camera photo. libjpeg can scale by 1/2, 1/4 or 1/8 while decoding: with Imagick, decoding a 12 MP JPEG this way takes about 30ms instead of about 90ms with GD, and the resize then starts from a 500x380 px image instead of a 4032x3024 px one.
Use it when Imagick is available and the requested preview is at most 1/8 of the max preview, otherwise decode the full max preview as before
Checklist
3. to review, feature component)stable32)AI (if applicable)