workaround for chrome offscreencanvas bug

.gitignore

@@ -1,3 +1,4 @@
 node_modules
 pnpm-lock.yaml
 assets/tf*
+*.swp

CHANGELOG.md

@@ -11,9 +11,8 @@
   
 ### **HEAD -> main** 2021/10/04 mandic00@live.com
 
-
-### **origin/main** 2021/10/03 mandic00@live.com
-
+- add blazepose v2 and add annotations to body results
+- fix backend order initialization
 - added docker notes
 - breaking change: new similarity and match methods
 - release candidate

demo/index.js

@@ -499,7 +499,7 @@ function runHumanDetect(input, canvas, timestamp) {
     return;
   }
   if (ui.hintsThread) clearInterval(ui.hintsThread);
-  if (ui.useWorker) {
+  if (ui.useWorker && human.env.offscreen) {
     // get image data from video as we cannot send html objects to webworker
     const offscreen = (typeof OffscreenCanvas !== 'undefined') ? new OffscreenCanvas(canvas.width, canvas.height) : document.createElement('canvas');
     offscreen.width = canvas.width;

package.json

@@ -66,14 +66,14 @@
     "@tensorflow/tfjs-layers": "^3.9.0",
     "@tensorflow/tfjs-node": "^3.9.0",
     "@tensorflow/tfjs-node-gpu": "^3.9.0",
-    "@types/node": "^16.10.2",
+    "@types/node": "^16.10.3",
     "@typescript-eslint/eslint-plugin": "^4.33.0",
     "@typescript-eslint/parser": "^4.33.0",
     "@vladmandic/build": "^0.5.3",
     "@vladmandic/pilogger": "^0.3.3",
     "canvas": "^2.8.0",
     "dayjs": "^1.10.7",
-    "esbuild": "^0.13.3",
+    "esbuild": "^0.13.4",
     "eslint": "^7.32.0",
     "eslint-config-airbnb-base": "^14.2.1",
     "eslint-plugin-import": "^2.24.2",

src/image/image.ts

@@ -24,6 +24,7 @@ export function canvas(width, height): HTMLCanvasElement | OffscreenCanvas {
     if (env.offscreen) {
       c = new OffscreenCanvas(width, height);
     } else {
+      if (typeof document === 'undefined') throw new Error('attempted to run in web worker but offscreenCanvas is not supported');
       c = document.createElement('canvas');
       c.width = width;
       c.height = height;

src/util/env.ts

@@ -1,6 +1,6 @@
 import * as tf from '../../dist/tfjs.esm.js';
 import * as image from '../image/image';
-import { mergeDeep } from './util';
+import { mergeDeep, log } from './util';
 
 export type Env = {
   browser: undefined | boolean,
@@ -129,8 +129,6 @@ export async function backendInfo() {
 export async function get() {
   env.browser = typeof navigator !== 'undefined';
   env.node = typeof process !== 'undefined';
-  // @ts-ignore WorkerGlobalScope evaluated in browser only
-  env.worker = env.browser ? (typeof WorkerGlobalScope !== 'undefined') : undefined;
   env.tfjs.version = tf.version_core;
 
   // offscreencanvas supported?
@@ -144,11 +142,21 @@ export async function get() {
       env.agent = navigator.userAgent.replace(raw[0], '');
       if (env.platform[1]) env.agent = env.agent.replace(raw[1], '');
       env.agent = env.agent.replace(/  /g, ' ');
+
+      // chrome offscreencanvas gpu memory leak
+      const isChrome = env.agent.match(/Chrome\/.[0-9]/g);
+      const verChrome = isChrome && isChrome[0] ? isChrome[0].split('/')[1] : 0;
+      if (verChrome > 0 && verChrome > 92 && verChrome < 96) {
+        log('disabling offscreenCanvas due to browser error:', isChrome ? isChrome[0] : 'unknown');
+        env.offscreen = false;
+      }
     }
   } else if (typeof process !== 'undefined') {
     env.platform = `${process.platform} ${process.arch}`;
     env.agent = `NodeJS ${process.version}`;
   }
+  // @ts-ignore WorkerGlobalScope evaluated in browser only
+  env.worker = env.browser && env.offscreen ? (typeof WorkerGlobalScope !== 'undefined') : undefined;
   await backendInfo();
 
   // get cpu info