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https://github.com/web-platform-tests/wpt
26 December 2018, 22:31:15 UTC
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Tip revision: 8c6df8f2518e0d04d7814df6fd2d6600e613a9ab authored by Emilio Cobos Álvarez on 09 April 2018, 21:02:15 UTC
Tests for non-functional :host selector.
Tip revision: 8c6df8f
2d.composite.uncovered.pattern.copy.html 
<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.composite.uncovered.pattern.copy</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/canvas-tests.js"></script>

<h1>2d.composite.uncovered.pattern.copy</h1>
<p class="desc">Pattern fill() draws pixels not covered by the source object as (0,0,0,0), and does not leave the pixels unchanged.</p>


<script>
var t = async_test("Pattern fill() draws pixels not covered by the source object as (0,0,0,0), and does not leave the pixels unchanged.");
t.step(function() {

var offscreenCanvas = new OffscreenCanvas(100, 50);
var ctx = offscreenCanvas.getContext('2d');


ctx.fillStyle = 'rgba(0, 255, 255, 0.5)';
ctx.fillRect(0, 0, 100, 50);
ctx.globalCompositeOperation = 'copy';
var promise = new Promise(function(resolve, reject) {
    var xhr = new XMLHttpRequest();
    xhr.open("GET", '/images/yellow.png');
    xhr.responseType = 'blob';
    xhr.send();
    xhr.onload = function() {
        resolve(xhr.response);
    };
});
promise.then(function(response) {
    ctx.fillStyle = ctx.createPattern(response, 'no-repeat');
    ctx.fillRect(0, 50, 100, 50);
    _assertPixelApprox(offscreenCanvas, 50,25, 0,0,0,0, "50,25", "0,0,0,0", 5);
});

t.done();

});
</script>
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