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Segregate script canvas context

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This commit is contained in:
Andreas Krühlmann
2026-01-13 13:53:23 +01:00
parent f215ef9aba
commit 5b0ef9c606
5 changed files with 109 additions and 46 deletions
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43
src/main/resources/static/js/broadcast/script-worker.js
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@@ -1,7 +1,5 @@
const scripts = new Map();
const allowedFetchUrls = new Set();
let canvas = null;
let ctx = null;
let channelName = "";
let tickIntervalId = null;
let lastTick = 0;
@@ -134,11 +132,11 @@ function updateScriptContexts() {
if (!script.context) {
return;
}
script.context.canvas = canvas;
script.context.ctx = ctx;
script.context.canvas = script.canvas;
script.context.ctx = script.ctx;
script.context.channelName = channelName;
script.context.width = canvas?.width ?? 0;
script.context.height = canvas?.height ?? 0;
script.context.width = script.canvas?.width ?? 0;
script.context.height = script.canvas?.height ?? 0;
});
}
@@ -149,7 +147,7 @@ function ensureTickLoop() {
startTime = performance.now();
lastTick = startTime;
tickIntervalId = setInterval(() => {
if (!ctx || scripts.size === 0) {
if (scripts.size === 0) {
return;
}
const now = performance.now();
@@ -158,7 +156,7 @@ function ensureTickLoop() {
lastTick = now;
scripts.forEach((script) => {
if (!script.tick) {
if (!script.tick || !script.ctx) {
return;
}
script.context.now = now;
@@ -199,22 +197,19 @@ function createScriptHandlers(source, context, state, sourceLabel = "") {
self.addEventListener("message", (event) => {
const { type, payload } = event.data || {};
if (type === "init") {
canvas = payload.canvas;
channelName = payload.channelName || "";
if (canvas) {
canvas.width = payload.width || canvas.width;
canvas.height = payload.height || canvas.height;
ctx = canvas.getContext("2d");
}
updateScriptContexts();
return;
}
if (type === "resize") {
if (canvas) {
canvas.width = payload.width || canvas.width;
canvas.height = payload.height || canvas.height;
}
scripts.forEach((script) => {
if (!script.canvas) {
return;
}
script.canvas.width = payload.width || script.canvas.width;
script.canvas.height = payload.height || script.canvas.height;
});
updateScriptContexts();
return;
}
@@ -226,16 +221,20 @@ self.addEventListener("message", (event) => {
}
if (type === "addScript") {
if (!payload?.id || !payload?.source) {
if (!payload?.id || !payload?.source || !payload?.canvas) {
return;
}
const canvas = payload.canvas;
canvas.width = payload.width || canvas.width;
canvas.height = payload.height || canvas.height;
const ctx = canvas.getContext("2d");
const state = {};
const context = {
canvas,
ctx,
channelName,
width: canvas?.width ?? 0,
height: canvas?.height ?? 0,
width: canvas.width ?? 0,
height: canvas.height ?? 0,
now: 0,
deltaMs: 0,
elapsedMs: 0,
@@ -251,6 +250,8 @@ self.addEventListener("message", (event) => {
}
const script = {
id: payload.id,
canvas,
ctx,
context,
state,
init: handlers.init,