OffscreenCanvas-transferable-exceptions.html

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<script src="../../resources/js-test.js"></script>
</head>
<body>
<script>

description("Test OffscreenCanvas transferable with exception cases.");

var worker = new Worker('./resources/OffscreenCanvas-transferable.js');

var width = 50;
var height = 50;
var offscreenCanvas1 = new OffscreenCanvas(width, height);

var ctx;
shouldNotThrow("ctx = offscreenCanvas1.getContext('2d')");
shouldBeType("ctx", "OffscreenCanvasRenderingContext2D");
shouldThrow("worker.postMessage({data: offscreenCanvas1}, [offscreenCanvas1])");

var offscreenCanvas2 = new OffscreenCanvas(width, height);
worker.postMessage({data: offscreenCanvas2}, [offscreenCanvas2]);
shouldThrow("offscreenCanvas2.transferToImageBitmap()");

shouldThrow("worker.postMessage({data: offscreenCanvas2}, [offscreenCanvas2])");
shouldThrow("offscreenCanvas2.getContext('2d')");

// using a transferred OffscreenCanvas as a source image throws.
shouldThrow("ctx.drawImage(offscreenCanvas2, 0, 0)");

finishJSTest();
</script>
</body>
</html>

chromium/third_party/blink/web_tests/fast/canvas-api/OffscreenCanvas-transferable-exceptions.html