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Fix alpha up and down

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Andrew 2022-10-28 21:07:36 +13:00 committed by Josh Holmer
parent 8396a262c3
commit 5429f63227
1 changed files with 4 additions and 2 deletions
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6
src/reduction/alpha.rs
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@ -108,7 +108,7 @@ fn reduced_alpha_to_up(png: &PngImage, bpc: usize, bpp: usize) -> Vec<u8> {
current_line.extend_from_slice(pixel); current_line.extend_from_slice(pixel);
} }
} }
last_line = current_line.clone(); last_line = current_line[1..current_line.len()].to_vec();
lines.push(current_line.clone()); lines.push(current_line.clone());
current_line.clear(); current_line.clear();
} }
@ -118,6 +118,7 @@ fn reduced_alpha_to_up(png: &PngImage, bpc: usize, bpp: usize) -> Vec<u8> {
fn reduced_alpha_to_down(png: &PngImage, bpc: usize, bpp: usize) -> Vec<u8> { fn reduced_alpha_to_down(png: &PngImage, bpc: usize, bpp: usize) -> Vec<u8> {
let mut reduced = Vec::with_capacity(png.data.len()); let mut reduced = Vec::with_capacity(png.data.len());
let mut last_line = Vec::new(); let mut last_line = Vec::new();
let mut pos = 0;
for line in png.scan_lines() { for line in png.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()];
@ -131,7 +132,8 @@ fn reduced_alpha_to_down(png: &PngImage, bpc: usize, bpp: usize) -> Vec<u8> {
reduced.extend_from_slice(pixel); reduced.extend_from_slice(pixel);
} }
} }
last_line = reduced.clone(); last_line = reduced[(pos + 1)..reduced.len()].to_vec();
pos = reduced.len();
} }
reduced reduced
} }