add back buffer support to agl

libraries/able_graphics_library/src/raw_pixel/arch/x86/mod.rs

@@ -7,6 +7,8 @@ use embedded_graphics::{
 
 pub struct Display {
     pub fb: *mut u32,
+    // Back buffer
+    pub bb: *mut u32,
     pub size: Size,
     pub color: Rgb888,
 }
@@ -15,6 +17,15 @@ impl Display {
     pub fn set_color(&mut self, color: Rgb888) {
         self.color = color;
     }
+    pub fn swap_buffers(&mut self) {
+        let size: usize = (self.size.height * self.size.width).try_into().unwrap();
+
+        unsafe {
+            let dst_ptr = self.fb;
+            let src_ptr = self.bb;
+            core::ptr::copy_nonoverlapping(src_ptr, dst_ptr, size);
+        }
+    }
 
     pub fn line(
         &mut self,
@@ -53,7 +64,7 @@ impl DrawTarget for Display {
                     return Err(BlitOutOfBoundsError);
                 }
 
-                self.fb
+                self.bb
                     .add(
                         (pos_y * self.size.width + pos_x)
                             .try_into()

libraries/able_graphics_library/src/raw_pixel/raw_pixel.aidl

@@ -0,0 +1,5 @@
+Type Coordinate = i32;
+Type Coordinates = (Coordinate, Coordinate);
+
+
+Function line Takes(Coordinates, Coordinates) Returns(Nothing);