Combine colors with saturation, not overflow

src/images.rs

@@ -220,11 +220,7 @@ impl ImageBuffer {
     pub fn add(&mut self, coords: (usize, usize), pixel: Color32) {
         let index = coords.1 * self.size[0] + coords.0;
         let old = self.pixels[index];
-        self.pixels[index] = Color32::from_rgb(
-            old.r() + pixel.r(),
-            old.g() + pixel.g(),
-            old.b() + pixel.b(),
-        );
+        self.pixels[index] = old + pixel;
     }
 
     pub fn changed(&self, image: &ColorImage) -> bool {

src/window/vip/framebuffer.rs

@@ -266,11 +266,7 @@ impl ImageRenderer<1> for FrameBufferRenderer {
                 } else {
                     Color32::BLACK
                 };
-                Color32::from_rgb(
-                    left.r() + right.r(),
-                    left.g() + right.g(),
-                    left.b() + right.b(),
-                )
+                left + right
             });
             let x = index / 64;
             for (i, pixel) in pixels.into_iter().enumerate() {

src/window/vip/world.rs

@@ -477,12 +477,7 @@ impl WorldWindow {
 
             let left_color = self.params.left_color;
             let right_color = self.params.right_color;
-            let both_color = Color32::from_rgb(
-                left_color.r() + right_color.r(),
-                left_color.g() + right_color.g(),
-                left_color.b() + right_color.b(),
-            );
-
+            let both_color = left_color + right_color;
             let painter = ui.painter();
             let draw_rect = |x1: f32, x2: f32, color: Color32| {
                 painter.line(
@@ -702,11 +697,7 @@ impl WorldRenderer {
         for (dst, shades) in image.pixels.iter_mut().zip(self.buffer.iter()) {
             let left = colors[0][shades[0] as usize];
             let right = colors[1][shades[1] as usize];
-            *dst = Color32::from_rgb(
-                left.r() + right.r(),
-                left.g() + right.g(),
-                left.b() + right.b(),
-            )
+            *dst = left + right;
         }
     }