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Verify bKGD in tests

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This commit is contained in:
Andrew 2022-11-29 17:14:46 +13:00
parent bab00cb961
commit c84186916e
1 changed files with 7 additions and 1 deletions
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8
tests/regression.rs
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@ -62,7 +62,13 @@ fn test_it_converts(
"optimized to wrong bit depth"
);
if let Some(palette) = png.raw.palette.as_ref() {
assert!(palette.len() <= 1 << (png.raw.ihdr.bit_depth.as_u8() as usize));
let mut max_palette_size = 1 << (png.raw.ihdr.bit_depth.as_u8() as usize);
// Ensure bKGD color is valid
if let Some(&idx) = png.raw.aux_headers.get(b"bKGD").and_then(|b| b.first()) {
assert!(palette.len() > idx as usize);
max_palette_size = max_palette_size.max(idx as usize + 1);
}
assert!(palette.len() <= max_palette_size);
} else {
assert_ne!(png.raw.ihdr.color_type, ColorType::Indexed);
}