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Expressions: a layer is made once per runtime and reads its info again in each evaluation

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tylerjenningsw
2026-10-27 14:04:09 -04:00
parent ca590aaead
commit 7c0ba4ef1d
1 changed files with 14 additions and 9 deletions
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crates/expr/src/prelude.js
+14 -9
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@@ -26,7 +26,7 @@ function __begin(t, v, c, l, path, uid, idx, fd, ti, tt, sv) {
textIndex = ti;
textTotal = tt;
selectorValue = sv;
__S = { c: c, l: l, path: path, uid: uid, idx: idx, fd: fd, comp: null, layer: null, prop: null, vars: {}, layers: {} };
__S = { c: c, l: l, path: path, uid: uid, idx: idx, fd: fd, comp: null, layer: null, prop: null, vars: {} };
__rc = 0;
__seed = 0;
__timeless = false;
@@ -550,17 +550,19 @@ function Layer(c, l) {
delete f.name;
delete f.length;
Object.setPrototypeOf(f, Layer.prototype);
f.__c = c; f.__l = l; f.__i = null;
f.__c = c; f.__l = l; f.__i = null; f.__s = null;
// Kept across evaluations (`__layer`), so an expression can't leave its own fields on one.
Object.preventExtensions(f);
return f;
}
// Layer `l` of comp `c`, made once per evaluation: a Layer is a callable function with its own
// prototype, dearer to make than a plain object, and expressions often name the same layer many
// times (`thisComp.layer("A")` in a loop, `.parent`).
// Layer `l` of comp `c`, made once per runtime: a callable Layer is dearer to make than a plain
// object, so it is kept, and its info (`__info`) is read again in each evaluation.
var __layers = {};
function __layer(c, l) {
if (__S === null) return new Layer(c, l);
var k = c + ':' + l;
return __S.layers[k] || (__S.layers[k] = new Layer(c, l));
// By comp, then layer: a `c + ':' + l` key costs more to build than the lookup saves.
var m = __layers[c] || (__layers[c] = {});
return m[l] || (m[l] = new Layer(c, l));
}
function __m3(m, p) {
@@ -585,7 +587,10 @@ function __m4(m, p, vec) {
Layer.prototype = {
__isLayer: true,
get __info() { return this.__i || (this.__i = __h(__LINFO, this.__c, this.__l)); },
get __info() {
if (this.__s !== __S) { this.__i = __h(__LINFO, this.__c, this.__l); this.__s = __S; }
return this.__i;
},
get name() { return this.__info[0]; },
get index() { return this.__info[1]; },
get inPoint() { return this.__info[2]; },