add image background example

examples/image_background.rs

+use bevy::prelude::*;
+use bevy_cosmic_edit::{
+    change_active_editor_sprite, change_active_editor_ui, ActiveEditor, CosmicAttrs,
+    CosmicBackground, CosmicEditPlugin, CosmicEditUiBundle,
+};
+use cosmic_text::{Attrs, AttrsOwned};
+
+fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
+    commands.spawn(Camera2dBundle::default());
+
+    let bg_image_handle = asset_server.load("img/bevy_logo_light.png");
+
+    let editor = commands
+        .spawn(CosmicEditUiBundle {
+            style: Style {
+                // Size and position of text box
+                width: Val::Px(300.),
+                height: Val::Px(50.),
+                left: Val::Px(100.),
+                top: Val::Px(100.),
+                ..default()
+            },
+            cosmic_attrs: CosmicAttrs(AttrsOwned::new(
+                Attrs::new().color(cosmic_text::Color::rgb(0, 255, 0)),
+            )),
+            background_image: CosmicBackground(Some(bg_image_handle)),
+            ..default()
+        })
+        .id();
+
+    commands.insert_resource(ActiveEditor {
+        entity: Some(editor),
+    });
+}
+
+fn main() {
+    App::new()
+        .add_plugins(DefaultPlugins)
+        .add_plugins(CosmicEditPlugin::default())
+        .add_systems(Startup, setup)
+        .add_systems(Update, change_active_editor_ui)
+        .add_systems(Update, change_active_editor_sprite)
+        .run();
+}

src/lib.rs

@@ -1046,19 +1046,22 @@ fn redraw_buffer_common(
 
         let mut pixels = vec![0; width as usize * height as usize * 4];
         if let Some(bg_image) = background_image {
-            let image = images.get(&bg_image).unwrap();
-
-            let mut dynamic_image = image.clone().try_into_dynamic().unwrap();
-            if image.size().x != width || image.size().y != height {
-                dynamic_image =
-                    dynamic_image.resize_to_fill(width as u32, height as u32, FilterType::Triangle);
-            }
-            for (i, (_, _, rgba)) in dynamic_image.pixels().enumerate() {
-                if let Some(p) = pixels.get_mut(i * 4..(i + 1) * 4) {
-                    p[0] = rgba[0];
-                    p[1] = rgba[1];
-                    p[2] = rgba[2];
-                    p[3] = rgba[3];
+            if let Some(image) = images.get(&bg_image) {
+                let mut dynamic_image = image.clone().try_into_dynamic().unwrap();
+                if image.size().x != width || image.size().y != height {
+                    dynamic_image = dynamic_image.resize_to_fill(
+                        width as u32,
+                        height as u32,
+                        FilterType::Triangle,
+                    );
+                }
+                for (i, (_, _, rgba)) in dynamic_image.pixels().enumerate() {
+                    if let Some(p) = pixels.get_mut(i * 4..(i + 1) * 4) {
+                        p[0] = rgba[0];
+                        p[1] = rgba[1];
+                        p[2] = rgba[2];
+                        p[3] = rgba[3];
+                    }
                 }
             }
         } else {