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Interpolate colors with premultiplied alpha.

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We need to clamp each interpolated values because some cubic-bezier functions
produce values that are out of range [0, 1].
This commit is contained in:
Hiroyuki Ikezoe 2016-12-26 15:28:00 +09:00
parent 7e3c9e2197
commit 3320457c07
3 changed files with 54 additions and 6 deletions
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23
components/style/properties/helpers/animated_properties.mako.rs
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@ -390,12 +390,23 @@ impl Interpolate for BackgroundSize {
impl Interpolate for RGBA {
#[inline]
fn interpolate(&self, other: &RGBA, progress: f64) -> Result<Self, ()> {
Ok(RGBA {
red: try!(self.red.interpolate(&other.red, progress)),
green: try!(self.green.interpolate(&other.green, progress)),
blue: try!(self.blue.interpolate(&other.blue, progress)),
alpha: try!(self.alpha.interpolate(&other.alpha, progress)),
})
fn clamp(val: f32) -> f32 {
val.max(0.).min(1.)
}
let alpha = clamp(try!(self.alpha.interpolate(&other.alpha, progress)));
if alpha == 0. {
Ok(RGBA { red: 0., green: 0., blue: 0., alpha: 0. })
} else {
Ok(RGBA { red: clamp(try!((self.red * self.alpha).interpolate(&(other.red * other.alpha), progress))
* 1. / alpha),
green: clamp(try!((self.green * self.alpha).interpolate(&(other.green * other.alpha), progress))
* 1. / alpha),
blue: clamp(try!((self.blue * self.alpha).interpolate(&(other.blue * other.alpha), progress))
* 1. / alpha),
alpha: alpha
})
}
}
}