Some updates for allowing crate consumers to use useful utility funcs

src/graphics.rs

@@ -45,10 +45,10 @@ impl GraphicsBuf {
             }
         });
 
-        draw_bresenham_line(0, 0, 127, 0, &mut gfx_buf);
+        self.draw_bresenham_line(0, 0, 127, 0);
-        draw_bresenham_line(0, 63, 128, 63, &mut gfx_buf);
+        self.draw_bresenham_line(0, 63, 128, 63);
-        draw_bresenham_line(0, 0, 0, 63, &mut gfx_buf);
+        self.draw_bresenham_line(0, 0, 0, 63);
-        draw_bresenham_line(127, 0, 127, 63, &mut gfx_buf);
+        self.draw_bresenham_line(127, 0, 127, 63);
     }
 
     pub fn draw_string(&mut self, x: u8, y: u8, string: &str) {
@@ -64,9 +64,19 @@ impl GraphicsBuf {
     pub fn get_px_buffer(&self) -> &[u8; 8192] {
         &self.buffer
     }
+
+    pub fn clr_rect(&mut self, x: u8, y: u8, w: u8, h: u8) {
+        let gfx_buf = &mut self.buffer;
+
+        for x in x as u32..(x + w) as u32 {
+            for y in y as u32..(y + h) as u32 {
+                gfx_buf[(y * 128 + x) as usize] = 0;
+            }
+        }
     }
 
-fn draw_bresenham_line(x0: u8, y0: u8, x1: u8, y1: u8, gfx_buf: &mut [u8; 8192]) {
+    pub fn draw_bresenham_line(&mut self, x0: u8, y0: u8, x1: u8, y1: u8) {
+        let gfx_buf = &mut self.buffer;
         let x0 = (x0 as i32).clamp(0, 127);
         let x1 = (x1 as i32).clamp(0, 127);
         let y0 = (y0 as i32).clamp(0, 63);
@@ -119,3 +129,4 @@ fn draw_bresenham_line(x0: u8, y0: u8, x1: u8, y1: u8, gfx_buf: &mut [u8; 8192])
             }
         }
     }
+}

src/graphics/sprite.rs

@@ -116,7 +116,7 @@ impl SpriteAtlas {
         }
     }
 
-    fn get_str_pixel_width(&self, str: &str) -> usize {
+    pub fn get_str_pixel_width(&self, str: &str) -> usize {
         let mut width = 0;
 
         for c in str.chars() {