1 files changed, 34 insertions, 0 deletions
diff --git a/evc/src/codec/encode.rs b/evc/src/codec/encode.rs
new file mode 100644
index 0000000..cf407fa
--- /dev/null
+++ b/evc/src/codec/encode.rs
@@ -0,0 +1,34 @@
+use crate::{
+    block::{Block, BlockInner},
+    frame::Frame,
+    view::View,
+};
+
+pub fn encode_block(view: View<&Frame>, prev: View<&Frame>) -> Block {
+    let diff = View::diff(&view, &prev) / view.area() as f64;
+    // eprintln!("{:?} {diff}", view.size);
+    let inner = if diff < 0.9 {
+        BlockInner::Reference {
+            translation: (0, 0),
+        }
+    } else {
+        if view.size.0 < 32 {
+            BlockInner::Literal(view.pixels())
+        } else {
+            let [av, bv] = view.split();
+            let [ap, bp] = prev.split();
+            let a = encode_block(av, ap);
+            let b = encode_block(bv, bp);
+            if a.is_literal() && b.is_literal() {
+                BlockInner::Literal(view.pixels())
+            } else {
+                BlockInner::Split(Box::new([a, b]))
+            }
+        }
+    };
+
+    Block {
+        size: view.size,
+        inner,
+    }
+}