| <!DOCTYPE html> |
| <title>Canvas test: 2d.imageData.create2.large</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.create2.html">create2</a>.large</h1> |
| <p class="desc">createImageData(sw, sh) works for sizes much larger than the canvas</p> |
| |
| <div class="refs">Spec references: |
| <ul> |
| <li><a href="../annotated-spec/canvas.html#testrefs.2d.imageData.create2.size">2d.imageData.create2.size</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.createImageData(1000, 2000); |
| _assertEqual(imgdata.data.length, imgdata.width*imgdata.height*4, "imgdata.data.length", "imgdata.width*imgdata.height*4"); |
| _assert(imgdata.width < imgdata.height, "imgdata.width < imgdata.height"); |
| _assert(imgdata.width > 0, "imgdata.width > 0"); |
| var isTransparentBlack = true; |
| for (var i = 0; i < imgdata.data.length; i += 7813) // check ~1024 points (assuming normal scaling) |
| if (imgdata.data[i] !== 0) |
| isTransparentBlack = false; |
| _assert(isTransparentBlack, "isTransparentBlack"); |
| |
| |
| }); |
| </script> |
| |
