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|---|
| (Empty) | |
| 1 <!DOCTYPE html> |
| 2 |
| 3 <script src="../../resources/testharness.js"></script> |
| 4 <script src="../../resources/testharnessreport.js"></script> |
| 5 <canvas id="myCanvas" width="240" height="240" style="border:1px solid #d3d3d3;"
></canvas> |
| 6 |
| 7 <script> |
| 8 |
| 9 test(function() { |
| 10 var c = document.getElementById("myCanvas"); |
| 11 var ctx = c.getContext("2d"); |
| 12 |
| 13 ctx.beginPath(); |
| 14 ctx.moveTo(120, 20); |
| 15 ctx.lineTo(220, 120); |
| 16 ctx.lineTo(120, 220); |
| 17 ctx.lineTo(20, 120); |
| 18 ctx.lineTo(120, 20); |
| 19 ctx.closePath(); |
| 20 ctx.clip(); |
| 21 |
| 22 ctx.lineWidth = 1; |
| 23 ctx.strokeStyle="#FF0000"; |
| 24 ctx.stroke(); |
| 25 |
| 26 // When canvas clips are not anti-aliased, only the first two segments of |
| 27 // the diamond-shaped closed path are drawn on the canvas. |
| 28 // To check that canvas clip anti-aliasing works fine, we check the |
| 29 // junction of the third and fourth segments of the path. |
| 30 var colorData = ctx.getImageData(20, 120, 1, 1).data; |
| 31 assert_equals(colorData[0], 255); |
| 32 assert_equals(colorData[1], 0); |
| 33 assert_equals(colorData[2], 0); |
| 34 assert_not_equals(colorData[3], 0); |
| 35 |
| 36 }, 'canvas-2d-clip-anti-aliasing should not return any error'); |
| 37 |
| 38 </script> |
| 39 |
| 40 |
| 41 |
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Chromium Code Reviews
Issue 2359843003:
Turning on clip anti-aliasing by default in Chrome. (Closed)
