| <!DOCTYPE html> |
| <title>Canvas test: 2d.imageData.get.source.negative</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.get.html">get</a>.<a href="index.2d.imageData.get.source.html">source</a>.negative</h1> |
| <p class="desc">getImageData() works with negative width and height, and returns top-to-bottom left-to-right</p> |
| |
| <div class="refs">Spec references: |
| <ul> |
| <li><a href="../annotated-spec/canvas.html#testrefs.2d.imageData.get.basic">2d.imageData.get.basic</a> |
| <li><a href="../annotated-spec/canvas.html#testrefs.2d.pixelarray.order">2d.pixelarray.order</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) { |
| |
| ctx.fillStyle = '#000'; |
| ctx.fillRect(0, 0, 100, 50); |
| ctx.fillStyle = '#fff'; |
| ctx.fillRect(20, 10, 60, 10); |
| |
| var imgdata1 = ctx.getImageData(85, 25, -10, -10); |
| _assertSame(imgdata1.data[0], 255, "imgdata1.data[\""+(0)+"\"]", "255"); |
| _assertSame(imgdata1.data[1], 255, "imgdata1.data[\""+(1)+"\"]", "255"); |
| _assertSame(imgdata1.data[2], 255, "imgdata1.data[\""+(2)+"\"]", "255"); |
| _assertSame(imgdata1.data[3], 255, "imgdata1.data[\""+(3)+"\"]", "255"); |
| _assertSame(imgdata1.data[imgdata1.data.length-4+0], 0, "imgdata1.data[imgdata1.data.length-4+0]", "0"); |
| _assertSame(imgdata1.data[imgdata1.data.length-4+1], 0, "imgdata1.data[imgdata1.data.length-4+1]", "0"); |
| _assertSame(imgdata1.data[imgdata1.data.length-4+2], 0, "imgdata1.data[imgdata1.data.length-4+2]", "0"); |
| _assertSame(imgdata1.data[imgdata1.data.length-4+3], 255, "imgdata1.data[imgdata1.data.length-4+3]", "255"); |
| |
| var imgdata2 = ctx.getImageData(0, 0, -1, -1); |
| _assertSame(imgdata2.data[0], 0, "imgdata2.data[\""+(0)+"\"]", "0"); |
| _assertSame(imgdata2.data[1], 0, "imgdata2.data[\""+(1)+"\"]", "0"); |
| _assertSame(imgdata2.data[2], 0, "imgdata2.data[\""+(2)+"\"]", "0"); |
| _assertSame(imgdata2.data[3], 0, "imgdata2.data[\""+(3)+"\"]", "0"); |
| |
| |
| }); |
| </script> |
| |
