rearrange configuration to be closer to where it's consumed

src/utils/framebuffer.rs

@@ -0,0 +1,31 @@
+use uefi::proto::console::gop::{BltOp, BltPixel, BltRegion, GraphicsOutput};
+
+pub struct Framebuffer {
+    width: usize,
+    height: usize,
+    pixels: Vec<BltPixel>,
+}
+
+impl Framebuffer {
+    pub fn new(width: usize, height: usize) -> Self {
+        Framebuffer {
+            width,
+            height,
+            pixels: vec![BltPixel::new(0, 0, 0); width * height],
+        }
+    }
+
+    pub fn pixel(&mut self, x: usize, y: usize) -> Option<&mut BltPixel> {
+        self.pixels.get_mut(y * self.width + x)
+    }
+
+    pub fn blit(&self, gop: &mut GraphicsOutput) {
+        gop.blt(BltOp::BufferToVideo {
+            buffer: &self.pixels,
+            src: BltRegion::Full,
+            dest: (0, 0),
+            dims: (self.width, self.height),
+        })
+        .expect("failed to blit framebuffer");
+    }
+}