| <!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> |
| |
