1 files changed, 25 insertions, 0 deletions
diff --git a/lvc/codec/src/decode.rs b/lvc/codec/src/decode.rs
new file mode 100644
index 0000000..771cba9
--- /dev/null
+++ b/lvc/codec/src/decode.rs
@@ -0,0 +1,25 @@
+use crate::{split::split, Block, Frame, View, P2};
+use rayon::join;
+
+pub fn decode(last_frame: &Frame, frame: &mut Frame, view: View, block: &Block) {
+    match block {
+        Block::Lit(pxs) => frame.import(view, &pxs),
+        Block::Split(a, b) => {
+            let [av, bv] = split(view);
+            let (frame1, frame2) =
+                unsafe { (&mut *(frame as *mut Frame), &mut *(frame as *mut Frame)) };
+            join(
+                || decode(last_frame, frame1, av, &a),
+                || decode(last_frame, frame2, bv, &b),
+            );
+        }
+        Block::Ref(r) => {
+            for y in view.a.y..view.b.y {
+                for x in view.a.x..view.b.x {
+                    let p = P2 { x, y };
+                    frame[p] = last_frame[p + r.pos_off] + r.color_off
+                }
+            }
+        }
+    }
+}