Source code
Revision control
Copy as Markdown
Other Tools
Test Info:
- This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/manual/convert-to-blob/offscreencanvas.convert.to.blob.w.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<script id="myWorker" type="text/worker">
function drawCanvas(ctx)
{
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 5, 5);
ctx.fillStyle = "green";
ctx.fillRect(5, 0, 5, 5);
ctx.fillStyle = "blue";
ctx.fillRect(0, 5, 5, 5);
ctx.fillStyle = "black";
ctx.fillRect(5, 5, 5, 5);
}
function testConvertToBlob(typeVal, qualityVal) {
var offscreenCanvas = new OffscreenCanvas(10, 10);
var oCtx = offscreenCanvas.getContext('2d');
drawCanvas(oCtx);
var promise;
if (typeVal == "empty" && qualityVal == "empty")
promise = offscreenCanvas.convertToBlob();
else if (typeVal == "empty" && qualityVal != "empty")
promise = offscreenCanvas.convertToBlob({quality: qualityVal});
else if (typeVal != "empty" && qualityVal == "empty")
promise = offscreenCanvas.convertToBlob({type: typeVal});
else
promise = offscreenCanvas.convertToBlob({type: typeVal, quality: qualityVal});
promise.then(function(blob) {
self.postMessage(blob);
});
}
function testConvertToBlobException1()
{
var offscreenCanvas = new OffscreenCanvas(10, 10);
self.postMessage({offscreenCanvas}, [offscreenCanvas]);
offscreenCanvas.convertToBlob().then(function() {
self.postMessage(false);
}, function(e) {
self.postMessage(e instanceof DOMException && e.name == "InvalidStateError");
});
}
function testConvertToBlobException2()
{
var offscreenCanvas = new OffscreenCanvas(0, 0);
offscreenCanvas.convertToBlob().then(function() {
self.postMessage(false);
}, function(e) {
self.postMessage(e instanceof DOMException && e.name == "IndexSizeError");
});
}
function testConvertToBlobException3(bitmap)
{
var offscreenCanvas = new OffscreenCanvas(10, 10);
var ctx = offscreenCanvas.getContext("2d");
ctx.drawImage(bitmap, 0, 0);
offscreenCanvas.convertToBlob().then(function() {
self.postMessage(false);
}, function(e) {
self.postMessage(e instanceof DOMException && e.name == "SecurityError");
});
}
self.onmessage = function(e) {
if (e.data instanceof ImageBitmap) {
testConvertToBlobException3(e.data);
return;
}
switch(e.data) {
case 'test1':
testConvertToBlob("empty", "empty");
break;
case 'test2':
testConvertToBlob("empty", 1.0);
break;
case 'test3':
testConvertToBlob("empty", 0.2);
break;
case 'test4':
testConvertToBlob("image/png", "empty");
break;
case 'test5':
testConvertToBlob("image/png", 1.0);
break;
case 'test6':
testConvertToBlob("image/png", 0.2);
break;
case 'test7':
testConvertToBlob("image/jpeg", "empty");
break;
case 'test8':
testConvertToBlob("image/jpeg", 1.0);
break;
case 'test9':
testConvertToBlob("image/jpeg", 0.2);
break;
case 'test10':
testConvertToBlob("image/webp", "empty");
break;
case 'test11':
testConvertToBlob("image/webp", 1.0);
break;
case 'test12':
testConvertToBlob("image/webp", 0.2);
break;
case 'test13':
testConvertToBlobException1();
break;
case 'test14':
testConvertToBlobException2();
break;
}
};
</script>
<script>
function makeWorker(test) {
var blob = new Blob([document.getElementById("myWorker").textContent]);
var worker = new Worker(URL.createObjectURL(blob));
worker.onerror = test.unreached_func("error");
return worker;
}
function drawCanvas(ctx)
{
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 5, 5);
ctx.fillStyle = "green";
ctx.fillRect(5, 0, 5, 5);
ctx.fillStyle = "blue";
ctx.fillRect(0, 5, 5, 5);
ctx.fillStyle = "black";
ctx.fillRect(5, 5, 5, 5);
}
function compareImages(image1, image2)
{
var canvas1 = document.createElement('canvas');
var canvas2 = document.createElement('canvas');
canvas1.width = canvas1.height = 10;
canvas2.width = canvas2.height = 10;
var ctx1 = canvas1.getContext('2d');
var ctx2 = canvas1.getContext('2d');
ctx1.drawImage(image1, 0, 0);
ctx2.drawImage(image2, 0, 0);
var data1 = ctx1.getImageData(0, 0, 10, 10).data;
var data2 = ctx2.getImageData(0, 0, 10, 10).data;
assert_equals(data1.length, data2.length);
var imageMatched = true;
for (var i = 0; i < data1.length; i++) {
if (data1[i] != data2[i]) {
imageMatched = false;
break;
}
}
assert_true(imageMatched);
}
function compareWithToBlob(t, typeVal, qualityVal, blob2)
{
var image1 = new Image();
var image2 = new Image();
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');
drawCanvas(ctx);
var imageLoadedCounter = 0;
if (typeVal == "empty" && qualityVal == "empty") {
canvas.toBlob(function(blob1) {
image1.src = URL.createObjectURL(blob1);
});
} else if (typeVal == "empty" && qualityVal != "empty") {
canvas.toBlob(function(blob1) {
image1.src = URL.createObjectURL(blob1);
}, "image/png", qualityVal);
} else if (typeVal != "empty" && qualityVal == "empty") {
canvas.toBlob(function(blob1) {
image1.src = URL.createObjectURL(blob1);
}, typeVal, 1.0);
} else {
canvas.toBlob(function(blob1) {
image1.src = URL.createObjectURL(blob1);
}, typeVal, qualityVal);
}
image2.src = URL.createObjectURL(blob2);
image1.onload = image2.onload = t.step_func(function() {
imageLoadedCounter++;
if (imageLoadedCounter == 2) {
compareImages(image1, image2);
t.done();
}
});
}
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func(function(msg) {
compareWithToBlob(t, "empty", "empty", msg.data);
}));
worker.postMessage('test1');
}, "Test that convertToBlob with default arguments produces correct result in a worker");
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func(function(msg) {
compareWithToBlob(t, "empty", 1.0, msg.data);
}));
worker.postMessage('test2');
}, "Test that convertToBlob with default type/1.0 quality produces correct result in a worker");
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func(function(msg) {
compareWithToBlob(t, "empty", 0.2, msg.data);
}));
worker.postMessage('test3');
}, "Test that convertToBlob with default type/0.2 quality produces correct result in a worker");
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func(function(msg) {
compareWithToBlob(t, "image/png", "empty", msg.data);
}));
worker.postMessage('test4');
}, "Test that convertToBlob with png/default quality produces correct result in a worker");
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func(function(msg) {
compareWithToBlob(t, "image/png", 1.0, msg.data);
}));
worker.postMessage('test5');
}, "Test that convertToBlob with png/1.0 quality produces correct result in a worker");
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func(function(msg) {
compareWithToBlob(t, "image/png", 0.2, msg.data);
}));
worker.postMessage('test6');
}, "Test that convertToBlob with png/0.2 quality produces correct result in a worker");
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func(function(msg) {
compareWithToBlob(t, "image/jpeg", "empty", msg.data);
}));
worker.postMessage('test7');
}, "Test that convertToBlob with jpeg/default quality produces correct result in a worker");
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func(function(msg) {
compareWithToBlob(t, "image/jpeg", 1.0, msg.data);
}));
worker.postMessage('test8');
}, "Test that convertToBlob with jpeg/1.0 quality produces correct result in a worker");
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func(function(msg) {
compareWithToBlob(t, "image/jpeg", 0.2, msg.data);
}));
worker.postMessage('test9');
}, "Test that convertToBlob with jpeg/0.2 quality produces correct result in a worker");
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func(function(msg) {
compareWithToBlob(t, "image/webp", "empty", msg.data);
}));
worker.postMessage('test10');
}, "Test that convertToBlob with webp/default quality produces correct result in a worker");
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func(function(msg) {
compareWithToBlob(t, "image/webp", 1.0, msg.data);
}));
worker.postMessage('test11');
}, "Test that convertToBlob with webp/1.0 quality produces correct result in a worker");
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func(function(msg) {
compareWithToBlob(t, "image/webp", 0.2, msg.data);
}));
worker.postMessage('test12');
}, "Test that convertToBlob with webp/0.2 quality produces correct result in a worker");
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func_done(function(msg) {
if (msg.data instanceof Object)
return;
assert_true(msg.data);
t.done();
}));
worker.postMessage('test13');
}, "Test that call convertToBlob on a detached OffscreenCanvas throws exception in a worker");
async_test(function(t) {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func_done(function(msg) {
assert_true(msg.data);
t.done();
}));
worker.postMessage('test14');
}, "Test that call convertToBlob on a OffscreenCanvas with size 0 throws exception in a worker");
async_test(function(t) {
var img = new Image();
img.src = "/images/green.png";
img.crossOrigin = "anonymous";
img.onload = t.step_func_done(() => {
createImageBitmap(img).then(t.step_func_done(bitmap => {
var worker = makeWorker(t);
worker.addEventListener('message', t.step_func_done(function(msg) {
assert_true(msg.data);
t.done();
}));
worker.postMessage(bitmap);
}));
});
}, "Test that call convertToBlob on a OffscreenCanvas with tainted origin throws exception in a worker");
</script>