Clear canvas with background color

src/graphics.rs

@@ -43,11 +43,11 @@ pub struct Canvas {
 
 impl Canvas {
     #[inline]
-    pub fn new(width: usize, height: usize) -> Self {
+    pub fn new(color: u32, width: usize, height: usize) -> Self {
         Self {
             width,
             height,
-            buffer: vec![0; width * height].into_boxed_slice(),
+            buffer: vec![color; width * height].into_boxed_slice(),
         }
     }
 
@@ -250,11 +250,13 @@ pub struct Graphics {
 
 impl Graphics {
     pub fn new(config: &Config) -> Self {
-        let canvas = Canvas::new(2000, 2000);
-
         let mut colors = Colors::default();
         Self::load_colors(&config.colors, &mut colors);
 
+        let bg = &config.colors.background;
+        let bg = ((bg.r as u32) << 16) | ((bg.g as u32) << 8) | (bg.b as u32);
+        let canvas = Canvas::new(bg, 2000, 2000);
+
         let glyph_cache = GlyphCache::new(colors.clone(), &config.fonts);
         let cell_cache = Default::default();
 
@@ -316,7 +318,8 @@ impl Graphics {
     }
 
     pub fn resize(&mut self, width: usize, height: usize) {
-        self.canvas = Canvas::new(width, height);
+        let bg = self.color_to_u32(&Color::Named(NamedColor::Background));
+        self.canvas = Canvas::new(bg, width, height);
         self.cell_cache.clear();
     }