1 files changed, 51 insertions, 0 deletions
diff --git a/old/evc/src/refsampler.rs b/old/evc/src/refsampler.rs
new file mode 100644
index 0000000..8a8f44f
--- /dev/null
+++ b/old/evc/src/refsampler.rs
@@ -0,0 +1,51 @@
+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,
+        }
+    }
+}