Move painter modules to sub module

src/painter/handle.rs

@@ -0,0 +1,48 @@
+extern crate image;
+
+use std::sync::mpsc::Sender;
+use std::thread::JoinHandle;
+
+use image::DynamicImage;
+
+use rect::Rect;
+
+
+
+/// A handle to a painter thread.
+///
+/// This also holds a channel to the painter thread,
+/// to allow image updates to be pushed to the thread.
+pub struct Handle {
+    #[allow(dead_code)]
+    thread: JoinHandle<u32>,
+    area: Rect,
+    image_sender: Sender<DynamicImage>,
+}
+
+impl Handle {
+    /// Create a new handle from the given properties.
+    pub fn new(thread: JoinHandle<u32>, area: Rect, image_sender: Sender<DynamicImage>) -> Handle {
+        Handle {
+            thread,
+            area,
+            image_sender,
+        }
+    }
+
+    /// Push an image update.
+    pub fn update_image(&self, full_image: &mut DynamicImage) {
+        // Crop the image to the area
+        let image = full_image.crop(
+            self.area.x,
+            self.area.y,
+            self.area.w,
+            self.area.h,
+        );
+
+        // Push a new image to the thread
+        // TODO: return this result
+        self.image_sender.send(image)
+            .expect("Failed to send image update to painter");
+    }
+}