From 2ef3d977a66d596b93cc2d7e039916fd4924ee61 Mon Sep 17 00:00:00 2001
From: Kristian Myram <kristian.myram@gmail.com>
Date: Mon, 12 Oct 2026 19:19:13 +0200
Subject: [PATCH] #808: sourcePointToComp and compPointToSource follow the
 layer's transform

Both returned their input unchanged. They now go through the layer's transform and its parents'
at comp time, and the inverse.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
---
 crates/script/src/model.rs   | 24 ++++++++++++++++++++++++
 crates/script/src/prelude.js |  8 ++++++--
 crates/script/src/tests.rs   | 22 ++++++++++++++++++++++
 3 files changed, 52 insertions(+), 2 deletions(-)

diff --git a/crates/script/src/model.rs b/crates/script/src/model.rs
index 4445fbbf..d3c084af 100644
--- a/crates/script/src/model.rs
+++ b/crates/script/src/model.rs
@@ -44,6 +44,7 @@ pub fn query(s: &mut Session, kind: &str, a: &J) -> R {
         "textdoc" => textdoc(s, a),
         "markers" => markers(s, a),
         "sourceRect" => source_rect(s, a),
+        "pointConvert" => point_convert(s, a),
         "resolveAdd" => resolve_add(s, a),
         "menuCommandId" => Ok(menu_command_id(a.get("name").and_then(J::as_str).unwrap_or(""))),
         "commandAt" => {
@@ -577,6 +578,29 @@ fn markers(s: &Session, a: &J) -> R {
     Ok(J::Array(out))
 }
 
+/// A layer's source point in comp space (`toComp`) or the reverse, through the layer's transform
+/// and its parents' at comp time (#808: `sourcePointToComp`, `compPointToSource`).
+fn point_convert(s: &Session, a: &J) -> R {
+    let (cid, c, l) = layer_of(s, a)?;
+    let t = f(a, "time").map(Tick::from_seconds_f64).unwrap_or_else(|| s.time_of(cid));
+    let p = a.get("point").and_then(J::as_array).ok_or("missing point")?;
+    let x = p.first().and_then(J::as_f64).unwrap_or(0.0);
+    let y = p.get(1).and_then(J::as_f64).unwrap_or(0.0);
+    let mut ctx = EvalCtx::new(&s.project, cid, c, t);
+    ctx.expr = s.expr.as_deref();
+    let (layer_space, _) = ctx.layer_to_comp(l);
+    let m = if a.get("toComp").and_then(J::as_bool).unwrap_or(true) {
+        layer_space
+    } else {
+        layer_space.inverse().ok_or("the layer's transform can't be inverted")?
+    };
+    let k = m.0;
+    let w = k[2][0] * x + k[2][1] * y + k[2][2];
+    let (ox, oy) = (k[0][0] * x + k[0][1] * y + k[0][2], k[1][0] * x + k[1][1] * y + k[1][2]);
+    let (ox, oy) = if w != 0.0 && w.is_finite() { (ox / w, oy / w) } else { (ox, oy) };
+    Ok(json!([ox, oy]))
+}
+
 fn source_rect(s: &Session, a: &J) -> R {
     let (cid, c, l) = layer_of(s, a)?;
     let t = f(a, "time").map(Tick::from_seconds_f64).unwrap_or_else(|| s.time_of(cid));
diff --git a/crates/script/src/prelude.js b/crates/script/src/prelude.js
index 9daac6ab..1956ce32 100644
--- a/crates/script/src/prelude.js
+++ b/crates/script/src/prelude.js
@@ -1285,8 +1285,12 @@ AVLayer.prototype.constructor = AVLayer;
   P.sourceRectAtTime = function (t, extents) {
     return __get("sourceRect", { comp: this.__comp, layer: this.__id, time: __num(t, "time"), extents: !!extents });
   };
-  P.sourcePointToComp = function (p) { return p; };
-  P.compPointToSource = function (p) { return p; };
+  // Source ↔ comp points, through the layer's transform and its parents' at the comp's time (#808).
+  function pointIn(layer, p, toComp) {
+    return __get("pointConvert", { comp: layer.__comp, layer: layer.__id, point: [__num(p[0], "point"), __num(p[1], "point")], toComp: toComp, time: layer.containingComp.time });
+  }
+  P.sourcePointToComp = function (p) { return pointIn(this, p, true); };
+  P.compPointToSource = function (p) { return pointIn(this, p, false); };
   P.replaceSource = function () { throw __err("replaceSource is not supported yet"); };
   P.openInViewer = function () { __call("layer.openLayer", this.__p1()); return null; };
 })();
diff --git a/crates/script/src/tests.rs b/crates/script/src/tests.rs
index 303bd820..986dc136 100644
--- a/crates/script/src/tests.rs
+++ b/crates/script/src/tests.rs
@@ -1010,3 +1010,25 @@ fn scripted_text_range_selector_resolves_and_is_the_only_selector() {
     );
     assert_eq!(o.result, json!([1, "ADBE Text Selector", 50, 100, "ADBE Text Percent Offset"]));
 }
+
+/// #808: sourcePointToComp and compPointToSource follow the layer's transform.
+#[test]
+fn source_point_conversions_follow_the_layer_transform() {
+    let mut s = session();
+    let o = ok(
+        &mut s,
+        r#"
+        var comp = app.project.items.addComp("Repro", 1920, 1080, 1, 10, 25);
+        var layer = comp.layers.addSolid([1, 0, 0], "S", 200, 100, 1);
+        layer.transform.position.setValue([400, 300]);
+        layer.transform.scale.setValue([50, 50]);
+        var a = layer.sourcePointToComp([0, 0]);
+        var b = layer.compPointToSource([400, 300]);
+        [a[0], a[1], b[0], b[1]]
+        "#,
+    );
+    let v = o.result;
+    let near = |x: &Value, want: f64| x.as_f64().is_some_and(|g| (g - want).abs() < 1e-6);
+    assert!(near(&v[0], 350.0) && near(&v[1], 275.0), "{v}");
+    assert!(near(&v[2], 100.0) && near(&v[3], 50.0), "{v}");
+}