Source code
Revision control
Copy as Markdown
Other Tools
Test Info:
- This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/manual/imagebitmap/canvas-ImageBitmap-close.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<body>
<p>Tests that the close method of ImageBitmap does dispose the image data.</p>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
promise_test(function(t) {
var worker = new Worker('worker-onmessage-noop.js');
var imgHeight = 10;
var imgWidth = 10;
var imageData = new ImageData(10, 10);
var bitmap;
var ctx;
return createImageBitmap(imageData).then(imageBitmap => {
bitmap = imageBitmap;
assert_equals(bitmap.width, imgWidth, "bitmap.width = 10");
assert_equals(bitmap.height, imgWidth, "bitmap.height = 10");
// Apply structured clone to the bitmap, nothing should be changed
worker.postMessage({data: bitmap});
assert_equals(bitmap.width, imgWidth, "bitmap.width = 10");
assert_equals(bitmap.height, imgWidth, "bitmap.height = 10");
// After calling close, the image data associated with the bitmap should no longer exist
bitmap.close();
assert_equals(bitmap.width, 0, "bitmap.width = 0");
assert_equals(bitmap.height, 0, "bitmap.height = 0");
var canvas = document.createElement("canvas");
canvas.width = imgWidth;
canvas.height = imgHeight;
ctx = canvas.getContext("2d");
assert_throws_dom("InvalidStateError", function() { ctx.drawImage(bitmap, 0, 0); });
// Try to apply structured clone to an already closed bitmap
try {
worker.postMessage({data: bitmap});
throw new Error("Apply clone to an closed bitmap should be rejected");
}
catch(ex) {
// Apply structured clone to an already closed bitmap is rejected as expected.
}
// Try to apply transferring to an already closed bitmap
try {
worker.postMessage({data: bitmap}, [bitmap]);
throw new Error("Apply transferring to an closed bitmap should be rejected");
} catch(ex) {
// Apply structured clone to an already closed bitmap is rejected as expected.
}
// Calling createImageBitmap from a closed bitmap should be rejected
return createImageBitmap(bitmap).then(function() {
throw new Error("createImageBitmap from a closed bitmap should be rejected");
}, ex => {
// Calling createImageBitmap from a closed ImageBitmap is rejected as expected.
});
}).then(() => {
// Call close to a already closed bitmap should be noop.
bitmap.close();
assert_equals(bitmap.width, 0, "bitmap.height = 0");
assert_equals(bitmap.height, 0, "bitmap.height = 0");
return createImageBitmap(imageData).then(imageBitmap => {
bitmap = imageBitmap;
assert_equals(bitmap.width, imgWidth, "bitmap.width = 10");
assert_equals(bitmap.height, imgWidth, "bitmap.height = 10");
// Transfer the bitmap to a worker
worker.postMessage({data: bitmap}, [bitmap]);
// After transferring, the bitmap is neutered.
assert_equals(bitmap.width, 0, "bitmap.height = 0");
assert_equals(bitmap.height, 0, "bitmap.height = 0");
// Calling close to a neutered bitmap should be noop.
bitmap.close();
assert_equals(bitmap.width, 0, "bitmap.height = 0");
assert_equals(bitmap.height, 0, "bitmap.height = 0");
});
}).catch(function(ex) {
throw new Error("No exception should be thrown.");
})
});
</script>