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Test Info: Warnings
- This test has a WPT meta file that expects 1 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /html/semantics/embedded-content/the-canvas-element/imagedata.html - WPT Dashboard Interop Dashboard
<!doctype html>
<meta charset="utf-8">
<title>ImageData Tests</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function() {
assert_throws_dom("IndexSizeError", function() {
new ImageData(0, 1);
});
}, "ImageData(w, h), width cannot be 0");
test(function() {
assert_throws_dom("IndexSizeError", function() {
new ImageData(1, 0);
});
}, "ImageData(w, h), height cannot be 0");
test(function() {
var imageData = new ImageData(2, 3);
assert_equals(imageData.width, 2);
assert_equals(imageData.height, 3);
assert_equals(imageData.data.length, 24);
assert_true(imageData.data instanceof Uint8ClampedArray);
}, "ImageData(w, h), exposed attributes check");
test(function() {
assert_throws_dom("InvalidStateError", function() {
new ImageData(new Uint8ClampedArray(3), 1);
});
}, "ImageData(buffer, w), the buffer size must be a multiple of 4");
test(function() {
assert_throws_dom("IndexSizeError", function() {
new ImageData(new Uint8ClampedArray(16), 3);
});
}, "ImageData(buffer, w), buffer size must be a multiple of the image width");
test(function() {
assert_throws_dom("IndexSizeError", function() {
new ImageData(new Uint8ClampedArray(16), 4, 3);
});
}, "ImageData(buffer, w, h), buffer.length == 4 * w * h must be true");
test(function() {
assert_throws_js(TypeError, function() {
new ImageData(new Int8Array(1), 1);
});
}, "ImageData(buffer, w, opt h), Uint8ClampedArray argument type check");
test(function() {
var imageData = new ImageData(new Uint8ClampedArray(24), 2);
assert_equals(imageData.width, 2);
assert_equals(imageData.height, 3);
assert_equals(imageData.data.length, 24);
assert_true(imageData.data instanceof Uint8ClampedArray);
}, "ImageData(buffer, w, opt h), exposed attributes check");
</script>