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Don't truncate bKGD on output

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This commit is contained in:
Andrew 2022-11-28 18:25:29 +13:00
parent c84186916e
commit 181c6dd96f
1 changed files with 5 additions and 1 deletions
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6
src/png/mod.rs
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@ -198,7 +198,11 @@ impl PngData {
// Palette
if let Some(ref palette) = self.raw.palette {
let mut palette_data = Vec::with_capacity(palette.len() * 3);
let max_palette_size = 1 << (self.raw.ihdr.bit_depth.as_u8() as usize);
let mut max_palette_size = 1 << (self.raw.ihdr.bit_depth.as_u8() as usize);
// Ensure bKGD color doesn't get truncated from palette
if let Some(&idx) = self.raw.aux_headers.get(b"bKGD").and_then(|b| b.first()) {
max_palette_size = max_palette_size.max(idx as usize + 1);
}
for px in palette.iter().take(max_palette_size) {
palette_data.extend_from_slice(px.rgb().as_slice());
}