third_party/web_platform_tests/2dcontext/compositing/2d.composite.uncovered.pattern.source-out.html

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<title>Canvas test: 2d.composite.uncovered.pattern.source-out</title>
<script src="/resources/testharness.js"></script>
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<script src="/common/canvas-tests.js"></script>
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<body class="show_output">

<h1>2d.composite.uncovered.pattern.source-out</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>


<p class="output">Actual output:</p>
<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<p class="output expectedtext">Expected output:<p><img src="2d.composite.uncovered.pattern.source-out.png" class="output expected" id="expected" alt="">
<ul id="d"></ul>
<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.");
_addTest(function(canvas, ctx) {


ctx.fillStyle = 'rgba(0, 255, 255, 0.5)';
ctx.fillRect(0, 0, 100, 50);
ctx.globalCompositeOperation = 'source-out';
ctx.fillStyle = ctx.createPattern(document.getElementById('yellow.png'), 'no-repeat');
ctx.fillRect(0, 50, 100, 50);
_assertPixelApprox(canvas, 50,25, 0,0,0,0, "50,25", "0,0,0,0", 5);


});
</script>
<img src="/images/yellow.png" id="yellow.png" class="resource">