<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script id="myWorker" type="text/worker">
self.onmessage = function(e) {
};
</script>
<script>

function makeWorker(script)
{
   var blob = new Blob([script]);
   return new Worker(URL.createObjectURL(blob));
}

async_test(function(t) {
    var worker = makeWorker(document.getElementById("myWorker").textContent);
    var offscreenCanvas = new OffscreenCanvas(10, 10);
    worker.postMessage({offscreenCanvas}, [offscreenCanvas]);
    offscreenCanvas.convertToBlob().then(t.step_func_done(function() {
        assert_false("convertToBlob didn't throw, but should be");
    }), t.step_func_done(function(e) {
        assert_true(e instanceof DOMException);
        assert_equals(e.name, "InvalidStateError");
    }));
}, "Test that call convertToBlob on a detached OffscreenCanvas throws exception");

async_test(function(t) {
    var offscreenCanvas = new OffscreenCanvas(0, 0);
    offscreenCanvas.convertToBlob().then(t.step_func_done(function() {
        assert_false("convertToBlob didn't throw, but should be");
    }), t.step_func_done(function(e) {
        assert_true(e instanceof DOMException);
        assert_equals(e.name, "IndexSizeError");
    }));
}, "Test that call convertToBlob on an OffscreenCanvas with size 0 throws exception");

async_test(function(t) {
    var webp_max_dimension = 16383; // Based on WEBPImageEncoder.cpp?l=52
    var offscreenCanvas = new OffscreenCanvas(10, webp_max_dimension + 1);
    var ctx = offscreenCanvas.getContext("2d");
    offscreenCanvas.convertToBlob({type: "image/webp"}).then(t.step_func_done(function() {
        assert_false("convertToBlob didn't throw, but should be");
    }), t.step_func_done(function(e) {
        assert_true(e instanceof DOMException);
        assert_equals(e.name, "EncodingError");
    }));
}, "Test that call convertToBlob throws EncodingError exception when encoding fails");

async_test(function(t) {
    var offscreenCanvas = new OffscreenCanvas(10, 10);
    offscreenCanvas.convertToBlob().then(t.step_func_done(function() {
        assert_false("convertToBlob didn't throw, but should be");
    }), t.step_func_done(function(e) {
        assert_true(e instanceof DOMException);
        assert_equals(e.name, "InvalidStateError");
    }));
}, "Test that call convertToBlob on an OffscreenCanvas without contexts throws exception");

</script>