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This pull request aims to dramatically improve the performance of
`BlurHashDecoder` while also reducing its memory allocations.
- Precompute cosines tables before composing the image so each cosine
value is only computed once.
- Compute cosines tables once if both are identical (for square images
with the same number of colors in both dimensions).
- Store colors in a one-dimension array instead of a two-dimension array
to reduce memory allocations.
- Use a simple `String.indexOf()` to find the index of a Base83 char,
which is both faster and needs less memory than a `HashMap` thanks to
better locality and no boxing of chars.
- No cache is used, so computations may be performed in parallel on
background threads without the need for synchronization which limits
throughput.
## Benchmarks
Simple: 4x4 colors, 32x32 pixels output. (This is what Mastodon and
Tusky currently use)
Complex: 9x9 colors, 256x256 pixels output.
**Pixel 7 (Android 14)**
```
365 738 ns 23 allocs Trace BlurHashDecoderBenchmark.tuskySimple
109 577 ns 8 allocs Trace BlurHashDecoderBenchmark.newSimple
108 771 647 ns 88 allocs Trace BlurHashDecoderBenchmark.tuskyComplex
12 932 076 ns 8 allocs Trace BlurHashDecoderBenchmark.newComplex
```
**Nexus 5 (Android 6)**
```
4 600 937 ns 22 allocs Trace BlurHashDecoderBenchmark.tuskySimple
1 391 487 ns 7 allocs Trace BlurHashDecoderBenchmark.newSimple
1 260 644 948 ns 87 allocs Trace BlurHashDecoderBenchmark.tuskyComplex
125 274 063 ns 7 allocs Trace BlurHashDecoderBenchmark.newComplex
```
Conclusion: The new implementation is **3 times faster** than the old
one for the current usage and up to **9 times faster** if we decide to
increase the BlurHash quality in the future.
The source code of the benchmark comparing the original untouched Kotlin
implementation to the new one can be found
[here](https://github.com/cbeyls/BlurHashAndroidBenchmark).
Tusky
Tusky is a beautiful Android client for Mastodon. Mastodon is an ActivityPub federated social network. That means no single entity controls the whole network, rather, like e-mail, volunteers and organisations operate their own independent servers, users from which can all interact with each other seamlessly.
Features
- Material Design
- Most Mastodon APIs implemented
- Multi-Account support
- Dark, light and black themes with the possibility to auto-switch based on the time of day
- Drafts - compose posts and save them for later
- Choose between different emoji styles
- Optimized for all screen sizes
- Completely open-source - no non-free dependencies like Google services
Testing
The nightly build containing the newest development code is available on Google Play.
Support
Check out our FAQs, your question may already be answered. If you have any bug reports, feature requests or questions please open an issue or send us a message at Tusky@mastodon.social!
Contributing
We always welcome new contributors! Please read our contribution guide to get started.