Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/fast/canvas-api/OffscreenCanvas-invalid-args.html 

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<title>Tests that the OffscreenCanvas can handle invalid arguments</title>
<script>
test(function() {
    // Since blink uses signed int internally, this case tests how the constructor
    // responds to the arguments that are larger than INT_MAX which would cause
    // overflow. The current implementation is expected to clamp.
    var setWidth = Math.pow(2, 31);
    var setHeight = Math.pow(2, 31);
    var obj = {Name: "John Doe", Age: 30};

    var canvas1 = new OffscreenCanvas(setWidth, setHeight);
    assert_equals(canvas1.width, setWidth-1);
    assert_equals(canvas1.height, setHeight-1);
    canvas1.width = null;
    canvas1.height = null;
    assert_equals(canvas1.width, 0);
    assert_equals(canvas1.height, 0);

    assert_throws_js(TypeError, function() { new OffscreenCanvas(-1, -1); });

    var canvas2 = new OffscreenCanvas(null, null);
    assert_equals(canvas2.width, 0);
    assert_equals(canvas2.height, 0);
    canvas2.width = setWidth;
    canvas2.height = setHeight;

    assert_equals(canvas2.width, setWidth-1);
    assert_equals(canvas2.height, setHeight-1);

    assert_throws_js(TypeError, function() { canvas2.width = -1; });
    assert_throws_js(TypeError, function() { canvas2.height = -1; });
    assert_throws_js(TypeError, function() { canvas2.width = obj; });
    assert_throws_js(TypeError, function() { canvas2.height = obj; });
    assert_throws_js(TypeError, function() { new OffscreenCanvas(obj, obj); });
});
</script>