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Reduce allocations during encoding #11

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Reduce allocations during encoding #11

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8978c9c
Abstract over quantization function in encode_ac
Spaceface16518 Jan 22, 2021
1df6990
Abstract over rounding function in encode_dc
Spaceface16518 Jan 22, 2021
230cd86
Remove redundant parenthesis
Spaceface16518 Jan 22, 2021
5c0b127
Only allocate once when constructing hash
Spaceface16518 Jan 22, 2021
00558a3
Use associated `pow` function
Spaceface16518 Jan 22, 2021
5e2586c
Format code
Spaceface16518 Jan 22, 2021
90d464a
Don't clone ac vector when calculating max value
Spaceface16518 Jan 22, 2021
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8 changes: 4 additions & 4 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -228,11 +228,11 @@ pub fn encode(

if !ac.is_empty() {
// I'm sure there's a better way to write this; following the Swift atm :)
let maxf = |a: &f64, b: &f64| a.partial_cmp(b).unwrap_or(Ordering::Equal);
let actual_maximum_value = ac
.clone()
.into_iter()
.map(|[a, b, c]| f64::max(f64::max(f64::abs(a), f64::abs(b)), f64::abs(c)))
.max_by(|a, b| a.partial_cmp(b).unwrap_or(Ordering::Equal))
.iter()
.map(|channels| channels.iter().copied().map(f64::abs).max_by(maxf).unwrap())
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Since we are iterating over an array, this will not be any less efficient than the hand-rolled version because it will likely be unrolled or vectorized.

.max_by(maxf)
.unwrap();
let quantised_maximum_value = usize::max(
0,
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