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Copy pathblend.rs
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143 lines (135 loc) · 4.11 KB
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//! Layer blend modes (the 4-character keys stored after the `8BIM` signature).
/// Photoshop blend mode keys.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[allow(missing_docs)]
pub enum BlendMode {
PassThrough,
#[default]
Normal,
Dissolve,
Darken,
Multiply,
ColorBurn,
LinearBurn,
DarkerColor,
Lighten,
Screen,
ColorDodge,
LinearDodge,
LighterColor,
Overlay,
SoftLight,
HardLight,
VividLight,
LinearLight,
PinLight,
HardMix,
Difference,
Exclusion,
Subtract,
Divide,
Hue,
Saturation,
Color,
Luminosity,
/// A key not known to this crate, preserved verbatim.
Unknown([u8; 4]),
}
impl BlendMode {
/// All known modes (27 layer modes plus pass-through for groups).
pub const ALL: [BlendMode; 28] = [
BlendMode::PassThrough,
BlendMode::Normal,
BlendMode::Dissolve,
BlendMode::Darken,
BlendMode::Multiply,
BlendMode::ColorBurn,
BlendMode::LinearBurn,
BlendMode::DarkerColor,
BlendMode::Lighten,
BlendMode::Screen,
BlendMode::ColorDodge,
BlendMode::LinearDodge,
BlendMode::LighterColor,
BlendMode::Overlay,
BlendMode::SoftLight,
BlendMode::HardLight,
BlendMode::VividLight,
BlendMode::LinearLight,
BlendMode::PinLight,
BlendMode::HardMix,
BlendMode::Difference,
BlendMode::Exclusion,
BlendMode::Subtract,
BlendMode::Divide,
BlendMode::Hue,
BlendMode::Saturation,
BlendMode::Color,
BlendMode::Luminosity,
];
/// The stored 4-byte key.
pub fn key(self) -> [u8; 4] {
*match self {
BlendMode::PassThrough => b"pass",
BlendMode::Normal => b"norm",
BlendMode::Dissolve => b"diss",
BlendMode::Darken => b"dark",
BlendMode::Multiply => b"mul ",
BlendMode::ColorBurn => b"idiv",
BlendMode::LinearBurn => b"lbrn",
BlendMode::DarkerColor => b"dkCl",
BlendMode::Lighten => b"lite",
BlendMode::Screen => b"scrn",
BlendMode::ColorDodge => b"div ",
BlendMode::LinearDodge => b"lddg",
BlendMode::LighterColor => b"lgCl",
BlendMode::Overlay => b"over",
BlendMode::SoftLight => b"sLit",
BlendMode::HardLight => b"hLit",
BlendMode::VividLight => b"vLit",
BlendMode::LinearLight => b"lLit",
BlendMode::PinLight => b"pLit",
BlendMode::HardMix => b"hMix",
BlendMode::Difference => b"diff",
BlendMode::Exclusion => b"smud",
BlendMode::Subtract => b"fsub",
BlendMode::Divide => b"fdiv",
BlendMode::Hue => b"hue ",
BlendMode::Saturation => b"sat ",
BlendMode::Color => b"colr",
BlendMode::Luminosity => b"lum ",
BlendMode::Unknown(ref k) => k,
}
}
/// Parses a stored key; unknown keys map to [`BlendMode::Unknown`].
pub fn from_key(key: [u8; 4]) -> Self {
BlendMode::ALL.iter().copied().find(|m| m.key() == key).unwrap_or(BlendMode::Unknown(key))
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn all_keys_roundtrip_and_unique() {
let mut keys = std::collections::HashSet::new();
for m in BlendMode::ALL {
assert_eq!(BlendMode::from_key(m.key()), m);
assert!(keys.insert(m.key()));
}
assert_eq!(keys.len(), 28);
}
#[test]
fn unknown_preserved() {
let m = BlendMode::from_key(*b"zzzz");
assert_eq!(m, BlendMode::Unknown(*b"zzzz"));
assert_eq!(m.key(), *b"zzzz");
}
#[test]
fn specific_keys() {
assert_eq!(BlendMode::Multiply.key(), *b"mul ");
assert_eq!(BlendMode::from_key(*b"smud"), BlendMode::Exclusion);
assert_eq!(BlendMode::from_key(*b"idiv"), BlendMode::ColorBurn);
assert_eq!(BlendMode::default(), BlendMode::Normal);
}
}