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perf: skip unused mobile field work #5

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Merged
parvbansal11 merged 1 commit into from
Aug 4, 2026
Merged

perf: skip unused mobile field work #5

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17 changes: 11 additions & 6 deletions field.js
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Original file line number Diff line number Diff line change
Expand Up @@ -612,7 +612,7 @@
canvas.style.height = H + "px";
ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
build();
measure();
if (!coarseField) measure();
};

// Reduced motion: run the simulation to rest off-screen, paint one frame,
Expand Down Expand Up @@ -644,14 +644,19 @@
const w = window.innerWidth;
clearTimeout(resizeTimer);
resizeTimer = setTimeout(() => {
if (Math.abs(w - lastW) < 2 && canvas.width === Math.round(w * dpr)) { measure(); return; }
if (Math.abs(w - lastW) < 2 && canvas.width === Math.round(w * dpr)) {
if (!coarseField) measure();
return;
}
lastW = w;
resize();
if (reduced.matches) settle();
}, 180);
}, { passive: true });

window.addEventListener("scroll", () => { scrollY = window.scrollY; }, { passive: true });
if (!coarseField) {
window.addEventListener("scroll", () => { scrollY = window.scrollY; }, { passive: true });
}

const updatePointer = (event, isFine) => {
const now = performance.now();
Expand Down Expand Up @@ -707,18 +712,18 @@
window.addEventListener("pointerup", releaseTouch, { passive: true });
window.addEventListener("pointercancel", releaseTouch, { passive: true });

if ("IntersectionObserver" in window) {
if (!coarseField && "IntersectionObserver" in window) {
const sections = [...document.querySelectorAll("main > section")];
const sectionObserver = new IntersectionObserver((entries) => {
const visible = entries.filter((entry) => entry.isIntersecting).sort((a, b) => b.intersectionRatio - a.intersectionRatio)[0];
if (visible) topologyMode = Math.abs(sections.indexOf(visible.target)) % 3;
}, { rootMargin: "-28% 0px -28% 0px", threshold: [0.05, 0.35, 0.7] });
sections.forEach((section) => sectionObserver.observe(section));
}
window.addEventListener("load", measure);
if (!coarseField) window.addEventListener("load", measure);
// Text reflowing after a late font swap moves every obstacle the field
// routes around, so the cached document-space rects have to be retaken.
if (document.fonts && document.fonts.ready) document.fonts.ready.then(measure);
if (!coarseField && document.fonts && document.fonts.ready) document.fonts.ready.then(measure);

document.addEventListener("visibilitychange", () => {
document.hidden ? stop() : start();
Expand Down