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Preallocate memory in reduced_alpha_to_up (#180)

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Kamal Ahmad 2019-06-27 22:44:49 +05:00 committed by Josh Holmer
parent 56b94542a6
commit 34ee78dbbc
1 changed files with 2 additions and 2 deletions
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4
src/reduction/alpha.rs
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@ -93,11 +93,11 @@ fn reduced_alpha_to_white(png: &PngImage, bpc: usize, bpp: usize) -> Vec<u8> {
} }
fn reduced_alpha_to_up(png: &PngImage, bpc: usize, bpp: usize) -> Vec<u8> { fn reduced_alpha_to_up(png: &PngImage, bpc: usize, bpp: usize) -> Vec<u8> {
let mut lines = Vec::new();
let mut scan_lines = png.scan_lines().collect::<Vec<ScanLine<'_>>>(); let mut scan_lines = png.scan_lines().collect::<Vec<ScanLine<'_>>>();
scan_lines.reverse(); scan_lines.reverse();
let mut lines = Vec::with_capacity(scan_lines.len());
let mut last_line = Vec::new(); let mut last_line = Vec::new();
let mut current_line = Vec::with_capacity(last_line.len()); let mut current_line = Vec::with_capacity(scan_lines[0].data.len() + 1); // filter size + pixels
for line in scan_lines { for line in scan_lines {
if line.data.len() != last_line.len() { if line.data.len() != last_line.len() {
last_line = vec![0; line.data.len()]; last_line = vec![0; line.data.len()];