Content - bde15e2d8c768c76b327a1ee89016fa440d656fc - 3ef330e/offscreen-canvas/compositing/2d.composite.globalAlpha.range.html

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Tip revision: a160360fd9f39b7343c3da95f5ae7dbd8e0f47b8 authored by joysyu@google.com on 28 July 2017, 19:55:01 UTC
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Tip revision: a160360

2d.composite.globalAlpha.range.html

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.composite.globalAlpha.range</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/canvas-tests.js"></script>

<h1>2d.composite.globalAlpha.range</h1>
<p class="desc"></p>


<script>
var t = async_test("");
t.step(function() {

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

ctx.globalAlpha = 0.5;
var a = ctx.globalAlpha; // might not be exactly 0.5, if it is rounded/quantised, so remember for future comparisons
ctx.globalAlpha = 1.1;
_assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a");
ctx.globalAlpha = -0.1;
_assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a");
ctx.globalAlpha = 0;
_assertSame(ctx.globalAlpha, 0, "ctx.globalAlpha", "0");
ctx.globalAlpha = 1;
_assertSame(ctx.globalAlpha, 1, "ctx.globalAlpha", "1");

t.done();

});
</script>

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