Add image accumulation entry point

I was hoping to implement the image filter/reduction step as well, but that seems to be meaningfully more complex

enkou-shaders/examples/gasket.rs

@@ -2,6 +2,7 @@ use anyhow::{Context, Result};
 use enkou_shaders::Coefficients2;
 use enkou_shaders::camera::Camera;
 use enkou_shaders::chaos_game::ChaosGame;
+use enkou_shaders::image::{BlendMode, ImageSettings};
 use enkou_shaders::transform::Transform;
 use enkou_shaders::variation::Variation;
 use glam::{Affine2, UVec2, Vec2, uvec2, vec2};
@@ -50,6 +51,8 @@ pub fn main() -> Result<()> {
         IMAGE_DIMENSION.as_vec2(),
     );
 
+    let image_settings = ImageSettings::new(BlendMode::Linear, IMAGE_DIMENSION);
+
     let mut image = GrayImage::new(IMAGE_DIMENSION.x, IMAGE_DIMENSION.y);
 
     let chaos_game = ChaosGame::new(&mut rng, &transforms, &weights, &variations);
@@ -57,7 +60,8 @@ pub fn main() -> Result<()> {
     chaos_game
         .skip(ITERATIONS_DISCARD)
         .take(ITERATIONS)
-        .filter_map(|(point_ifs, _)| camera.transform_point_to_image(point_ifs))
+        .map(|(point_ifs, _)| camera.transform_point(point_ifs))
+        .filter_map(|point_pixel| image_settings.transform_point_to_image(point_pixel))
         .for_each(|point_pixel| image.put_pixel(point_pixel.x, point_pixel.y, Luma([255])));
 
     let temp = NamedTempFile::with_suffix(".png").context("Unable to create file for image")?;