| <!DOCTYPE html> |
| <title>Canvas test: 2d.imageData.object.wrap</title> |
| <script src="../tests.js"></script> |
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| <p> |
| <a href="2d.imageData.object.string.html" accesskey="p" title="[p] 2d.imageData.object.string"><</a> |
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| <a href="2d.imageData.object.round.html" accesskey="n" title="[n] 2d.imageData.object.round">></a> |
| <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>.wrap</h1> |
| <p class="desc">ImageData.data wraps numbers modulo 256</p> |
| <div class="refs">References: |
| <ul> |
| <li><a href="spec.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] = 0; |
| _assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0"); |
| imgdata.data[0] = 300; |
| _assertSame(imgdata.data[0], 44, "imgdata.data[\""+(0)+"\"]", "44"); |
| imgdata.data[0] = -100; |
| _assertSame(imgdata.data[0], 156, "imgdata.data[\""+(0)+"\"]", "156"); |
| |
| imgdata.data[0] = 200+Math.pow(2, 32); |
| _assertSame(imgdata.data[0], 200, "imgdata.data[\""+(0)+"\"]", "200"); |
| imgdata.data[0] = -200-Math.pow(2, 32); |
| _assertSame(imgdata.data[0], 56, "imgdata.data[\""+(0)+"\"]", "56"); |
| |
| imgdata.data[0] = -Infinity; |
| _assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0"); |
| imgdata.data[0] = Infinity; |
| _assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0"); |
| |
| |
| }); |
| </script> |
| |
