mappings: split coord mapping from pixel mapping

src/render.rs

@@ -2,12 +2,30 @@ use std::io;
 use rgb::Rgb;
 
 use crate::geometry::*;
+use crate::lib8::Rgb8Blend;
+use crate::lib8::interpolate::Fract8Ops;
+use crate::power::AsMilliwatts;
 use crate::task::Task;
 use crate::time::Periodically;
 use running_average::RealTimeRunningAverage;
 use std::marker::PhantomData;
 use std::fmt::Debug;
 
+pub trait HardwarePixel: Send + Sync + Rgb8Blend + Copy + AsMilliwatts + Default + From<Rgb<u8>> + Fract8Ops {}
+impl<T> HardwarePixel for T where T: Send + Sync + Rgb8Blend + Copy + AsMilliwatts + Default + From<Rgb<u8>> + Fract8Ops {}
+
+pub trait PixelView {
+    type Pixel: HardwarePixel;
+    fn next(&mut self) -> Option<(Coordinates<Virtual>, &mut Self::Pixel)>;
+}
+
+pub trait Sample {
+    type Pixel: HardwarePixel;
+
+    fn sample(&mut self, rect: &Rectangle<Virtual>) -> impl PixelView<Pixel = Self::Pixel>;
+}
+
+
 pub trait Shader: Send + Debug {
     fn draw(&self, surface_coords: &VirtualCoordinates, frame: usize) -> Rgb<u8>;
 }