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Cover PNG transparency keys in opaque outline decoding

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Dylan M. Taylor
2026-11-15 17:42:47 +00:00
parent 2ad5fa1734
commit abe90db45a
1 changed files with 19 additions and 0 deletions
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crates/trace/src/opaque.rs
+19
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@@ -326,6 +326,25 @@ mod tests {
assert!(decode_alpha(b"not an image").is_err());
}
#[test]
fn decode_alpha_expands_gray_and_rgb_png_transparency_keys() {
// Original synthetic 2x1 PNGs: first pixel matches tRNS; second is opaque.
// Generated from PNG chunks and zlib scanlines, without an external image asset.
let gray: &[u8] = &[
137, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13, 73, 72, 68, 82, 0, 0, 0, 2, 0, 0, 0, 1, 8, 0, 0, 0, 0, 209, 73, 32, 86, 0, 0, 0, 2, 116,
82, 78, 83, 0, 0, 118, 147, 205, 56, 0, 0, 0, 11, 73, 68, 65, 84, 120, 156, 99, 96, 168, 7, 0, 0, 130, 0, 128, 32, 18, 25, 54, 0, 0, 0,
0, 73, 69, 78, 68, 174, 66, 96, 130,
];
let rgb: &[u8] = &[
137, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13, 73, 72, 68, 82, 0, 0, 0, 2, 0, 0, 0, 1, 8, 2, 0, 0, 0, 123, 64, 232, 221, 0, 0, 0, 6, 116,
82, 78, 83, 0, 255, 0, 0, 0, 0, 164, 194, 192, 29, 0, 0, 0, 15, 73, 68, 65, 84, 120, 156, 99, 248, 207, 192, 192, 240, 159, 1, 0, 7, 255,
1, 255, 1, 127, 137, 167, 0, 0, 0, 0, 73, 69, 78, 68, 174, 66, 96, 130,
];
for bytes in [gray, rgb] {
assert_eq!(decode_alpha(bytes).unwrap(), Some((2, 1, vec![0, 255])));
}
}
#[test]
fn decode_alpha_preserves_cmyk_and_lab_tiff_extra_samples() {
use craft_image_codecs::{ChannelLayout, Format, Image};