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Optimize filter mode 5 SAD loop

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This commit is contained in:
Joshua Holmer 2016-04-05 10:52:02 -04:00
parent 548c69cad7
commit 9302caed59
2 changed files with 5 additions and 6 deletions
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3
CHANGELOG.md
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@ -1,3 +1,6 @@
**Version 0.3.1 (unreleased)**
- Performance optimizations
**Version 0.3.0** **Version 0.3.0**
- Properly decode interlaced images - Properly decode interlaced images
- [SEMVER_MINOR] Allow converting between progressive and interlaced images ([#3](https://github.com/shssoichiro/oxipng/issues/3)) - [SEMVER_MINOR] Allow converting between progressive and interlaced images ([#3](https://github.com/shssoichiro/oxipng/issues/3))

8
src/png.rs
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@ -473,12 +473,8 @@ impl PngData {
let (best_filter, best_line) = trials.iter() let (best_filter, best_line) = trials.iter()
.min_by_key(|x| { .min_by_key(|x| {
x.1.iter().fold(0u64, |acc, &x| { x.1.iter().fold(0u64, |acc, &x| {
let signed: i16 = if x > 127 { let signed = x as i8;
(x as i16) - 256 acc + (signed as i16).abs() as u64
} else {
x as i16
};
acc + signed.abs() as u64
}) })
}) })
.unwrap(); .unwrap();