blob: c2b9b6fcf396067e2bcff308388496d40253c522 [file] [log] [blame]
<!DOCTYPE html>
<title>Canvas test: 2d.imageData.object.clamp</title>
<meta name="author" content="Philip Taylor">
<script src="../common/canvas-tests.js"></script>
<link rel="stylesheet" href="../common/canvas-tests.css">
<body class="show_output">
<h1><a href="index.2d.html">2d</a>.<a href="index.2d.imageData.html">imageData</a>.<a href="index.2d.imageData.object.html">object</a>.clamp</h1>
<p class="desc">ImageData.data clamps numbers to [0, 255]</p>
<div class="refs">Spec references:
<ul>
<li><a href="../annotated-spec/canvas.html#testrefs.2d.pixelarray.modify">2d.pixelarray.modify</a>
</ul>
</div>
<p class="output">Actual output:</p>
<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<ul id="d"></ul>
<script>
_addTest(function(canvas, ctx) {
var imgdata = ctx.getImageData(0, 0, 10, 10);
imgdata.data[0] = 100;
imgdata.data[0] = 300;
_assertSame(imgdata.data[0], 255, "imgdata.data[\""+(0)+"\"]", "255");
imgdata.data[0] = 100;
imgdata.data[0] = -100;
_assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0");
imgdata.data[0] = 100;
imgdata.data[0] = 200+Math.pow(2, 32);
_assertSame(imgdata.data[0], 255, "imgdata.data[\""+(0)+"\"]", "255");
imgdata.data[0] = 100;
imgdata.data[0] = -200-Math.pow(2, 32);
_assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0");
imgdata.data[0] = 100;
imgdata.data[0] = Math.pow(10, 39);
_assertSame(imgdata.data[0], 255, "imgdata.data[\""+(0)+"\"]", "255");
imgdata.data[0] = 100;
imgdata.data[0] = -Math.pow(10, 39);
_assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0");
imgdata.data[0] = 100;
imgdata.data[0] = -Infinity;
_assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0");
imgdata.data[0] = 100;
imgdata.data[0] = Infinity;
_assertSame(imgdata.data[0], 255, "imgdata.data[\""+(0)+"\"]", "255");
});
</script>