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Parallel alphas

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This commit is contained in:
Kornel Lesiński 2018-06-01 16:45:40 +01:00
parent e472c82876
commit 460b05963d
1 changed files with 7 additions and 3 deletions
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10
src/png/mod.rs
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@ -15,6 +15,7 @@ use std::fs::File;
use std::io::{Read, Seek, SeekFrom};
use std::iter::Iterator;
use std::path::Path;
use rayon::prelude::*;
const STD_COMPRESSION: u8 = 8;
const STD_STRATEGY: u8 = 2; // Huffman only
@ -601,13 +602,16 @@ impl PngData {
pub fn try_alpha_reduction(&mut self, alphas: &HashSet<AlphaOptim>) {
assert!(!alphas.is_empty());
let alphas = alphas.iter().collect::<Vec<_>>();
let best = alphas
.iter()
.filter_map(|alpha| {
.par_iter()
.with_max_len(1)
.filter_map(|&alpha| {
let mut image = self.clone();
image.reduce_alpha_channel(*alpha);
STD_FILTERS
.iter()
.par_iter()
.with_max_len(1)
.filter_map(|f| {
deflate::deflate(
&image.filter_image(*f),