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use crate::{
block::AdvancedReference,
format::ser::map_scalar8,
frame::Frame,
helpers::{matrix::Mat2, pixel::Pixel, vector::Vec2},
view::View,
};
#[derive(Debug, Clone)]
pub struct Sampler<'a> {
pub view: View<&'a Frame>,
pub halfsize: Vec2<f32>,
pub translation: Vec2<f32>,
pub transform: Mat2<f32>,
pub value_scale: f32,
}
impl<'a> Sampler<'a> {
#[inline]
pub fn sample(&self, p: Vec2<f32>) -> Pixel {
self.view
.sample(self.translation + self.transform.transform(p - self.halfsize) + self.halfsize)
.scale(self.value_scale)
}
pub fn from_refblock(
view: View<&'a Frame>,
AdvancedReference {
translation,
transform,
value_scale,
}: &AdvancedReference,
) -> Self {
Self {
transform: Mat2 {
a: map_scalar8(transform.a),
b: map_scalar8(transform.b),
c: map_scalar8(transform.c),
d: map_scalar8(transform.d),
},
halfsize: Into::<Vec2<f32>>::into(view.size).scale(0.5),
translation: Vec2 {
x: map_scalar8(translation.x),
y: map_scalar8(translation.y),
},
value_scale: 1.05f32.powf(*value_scale as f32),
view,
}
}
}
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