1 files changed, 42 insertions, 0 deletions
diff --git a/lvc/codec/src/debug.rs b/lvc/codec/src/debug.rs
new file mode 100644
index 0000000..d6c37c2
--- /dev/null
+++ b/lvc/codec/src/debug.rs
@@ -0,0 +1,42 @@
+use crate::{split::split, Block, Frame, Pixel, View, P2};
+
+pub fn draw_debug(frame: &mut Frame, view: View, block: &Block) {
+    match block {
+        Block::Lit(_) => rect(frame, view, Pixel::GREEN),
+        Block::Split(a, b) => {
+            let [av, bv] = split(view);
+            draw_debug(frame, av, &a);
+            draw_debug(frame, bv, &b);
+        }
+        Block::Ref(r) => {
+            let v = View {
+                a: view.a,
+                b: view.a + P2 { x: 2, y: 2 },
+            };
+            if r.pos_off != P2::ZERO {
+                fill_rect(frame, v + P2 { x: 0, y: 0 }, Pixel::BLUE)
+            }
+            if r.color_off != Pixel::BLACK {
+                fill_rect(frame, v + P2 { x: 2, y: 0 }, Pixel::RED)
+            }
+        }
+    }
+}
+
+fn rect(frame: &mut Frame, view: View, color: Pixel) {
+    for x in view.a.x..view.b.x {
+        frame[P2 { x, y: view.a.y }] = color;
+        frame[P2 { x, y: view.b.y - 1 }] = color;
+    }
+    for y in view.a.y..view.b.y {
+        frame[P2 { y, x: view.a.x }] = color;
+        frame[P2 { y, x: view.b.x - 1 }] = color;
+    }
+}
+fn fill_rect(frame: &mut Frame, view: View, color: Pixel) {
+    for y in view.a.y..view.b.y {
+        for x in view.a.x..view.b.x {
+            frame[P2 { x, y }] = color;
+        }
+    }
+}