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perf: Improve preview cold generation - #65146
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When the max preview was just generated, its image is still in memory. Use it to resize the requested preview instead of reading the stored max preview back and decoding it again, which for a 12 MP photo takes a few hundred milliseconds. Assisted-by: ClaudeCode:claude-opus-5-5 Signed-off-by: Carl Schwan <carl@carlschwan.eu>
New preview sizes were always resized from the max preview, so each one paid for decoding and resampling the full resolution image. Use the smallest cached, uncropped preview that is still larger than the requested size as the source instead, e.g. the 256px grid view preview for the 64px list view one. Assisted-by: ClaudeCode:claude-opus-5-5 Signed-off-by: Carl Schwan <carl@carlschwan.eu>
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Summary
1st commit: reuse the generated max preview image
2nd commit: resize from the smallest suitable cached preview to avoid reading the max preview when possible
Save: with GD cold list view 8.2 → 13.6 req/s, grid 15.8 → 18.8
TODO
Checklist
3. to review, feature component)stable32)AI (if applicable)