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94 lines
3 KiB
Markdown
94 lines
3 KiB
Markdown
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# pict-rs 0.5.7
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## Overview
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pict-rs 0.5.7 adds support for generating blurhashes from images and includes a couple unrelated
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fixes and tweaks.
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### Features
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- [Blurhash Endpoint](#blurhash-endpoint)
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### Changes
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- [File Path Changes](#file-path-changes)
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- [Performance Improvements](#performance-improvements)
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### Fixes
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- [More Consistent Errors](#more-consistent-errors)
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- [APNG Detection](#apng-detection)
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## Upgrade Notes
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There is a small repo format migration between 0.5.6 and 0.5.7. For sled it's simply opening a new
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tree, for postgres it involves adding a new column to the hashes table. These changes will
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automatically apply when launching pict-rs 0.5.7. Upgrading should be as simple as pulling a new
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version of pict-rs.
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## Descriptions
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### Blurhash Endpoint
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A new endpoint at `/image/blurhash` has been added for generating blurhashes from uploaded media. A
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blurhash is a short string that encodes a few notable color values from an image that can be
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reconstructed into a blurred approximation of the original image. Notably, blurhashes are used by
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Mastodon to act as placeholders for sensitive media. For more information about blurhashes, see
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[blurha.sh](https://blurha.sh).
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This endpoint is powered by my new blurhash encoding library,
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[blurhash-update](https://crates.io/crates/blurhash-update).
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On success, the blurhash endpoint returns the following JSON.
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```json
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{
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"msg": "ok",
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"blurhash": "LGF5]+Yk^6#M@-5c,1J5@[or[Q6."
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}
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```
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pict-rs does not provide a blurhash decoding mechanism (it would defeat the purpose of blurhashes to
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do so).
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### File Path Changes
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pict-rs has dropped its dependency on my `storage-path-generator` library in favor of using UUIDs to
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create unique file paths for uploaded media. This means that newly uploaded media will be stored in
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a different directory structure, and with different filenames. The purpose of this is to reduce
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database use by removing the need to synchronize the current path state.
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pict-rs 0.5.7 also adds file extensions back to file paths, since they are now somewhat-publicly
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visible (when using the public_endpoint configuration with object storage).
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Neither of these changes affect previously uploaded media.
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### Performance Improvements
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pict-rs 0.5.7 now buffers media in memory less frequently, opting to stream bytes directly from
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sources to sinks. This should improve general memory use, as well as decrease time pict-rs would
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spend waiting to aggregate bytes.
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pict-rs also no longer requires bytes be present in contiguous buffers, avoiding large allocations
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and reducing memcpys.
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### More Consistent Errors
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pict-rs 0.5 introduced machine-readable error codes that returned alongside error messages, but
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there were a couple locations in pict-rs that failed to include them. pict-rs 0.5.7 resolves this,
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ensuring all error paths properly return codes.
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### APNG Detection
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pict-rs 0.5.7 fixes the imagemagick delegate policy for ffmpeg, which allows for properly detecting
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certain media, notably APNG files. pict-rs should once again be able to properly handle uploaded
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APNGs.
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