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Implement built in functions opacity and alpha

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This commit is contained in:
ConnorSkees 2020-02-08 17:49:23 -05:00
parent 4585558266
commit 04d2c4ab74
2 changed files with 16 additions and 0 deletions
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12
src/builtin/color.rs
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@ -39,4 +39,16 @@ pub(crate) fn register(f: &mut BTreeMap<String, Builtin>) {
_ => todo!("non-color given to builtin function `blue()`")
}
});
decl!(f "opacity", |args, _| {
match arg!(args, 0, "color") {
Value::Color(c) => Some(Value::Dimension(BigRational::from_integer(BigInt::from(c.alpha())), Unit::None)),
_ => todo!("non-color given to builtin function `opacity()`")
}
});
decl!(f "alpha", |args, _| {
match arg!(args, 0, "color") {
Value::Color(c) => Some(Value::Dimension(BigRational::from_integer(BigInt::from(c.alpha())), Unit::None)),
_ => todo!("non-color given to builtin function `alpha()`")
}
});
}

4
src/color/mod.rs
View File

@ -36,6 +36,10 @@ impl Color {
self.green
}
pub const fn alpha(&self) -> u16 {
self.alpha
}
pub fn from_values(red: u16, green: u16, blue: u16, alpha: u16) -> Self {
let repr = if alpha >= 1 {
format!("#{:0>2x}{:0>2x}{:0>2x}", red, green, blue)