third_party/WebKit/LayoutTests/fast/canvas/canvas-large-pattern.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <body>
   4     <script src="../../resources/js-test.js"></script>
   5     <script type="text/javascript">
   6
   7         description("Verifies createPattern using a source image that is a canvas 40k pixels wide.");
   8         // This test does not currently succeed because skia does not handle
   9         // canvases more than 32k pixels wide. For now, this test serves the
  10         // purpose of verifying that this use case does not crash the browser.
  11         // Crasher bug: crbug.com/281504
  12
  13             var canvas = document.createElement('canvas');
  14             canvas.width = 40000;
  15             var context = canvas.getContext('2d');
  16             context.fillStyle = '#0f0';
  17             context.fillRect(0, 0, 1, 1);
  18
  19             var dstCanvas = document.createElement('canvas');
  20             var dstContext = dstCanvas.getContext('2d');
  21             var pattern = dstContext.createPattern(canvas, 'repeat');
  22             dstContext.fillStyle = pattern;
  23             dstContext.fillRect(0, 0, dstCanvas.width, dstCanvas.height);
  24
  25             var imageData = dstContext.getImageData(0, 0, 1, 1);
  26             var imgdata = imageData.data;
  27             shouldBe("imgdata[0]", "0");
  28             shouldBe("imgdata[1]", "255");
  29             shouldBe("imgdata[2]", "0");
  30             shouldBe("imgdata[3]", "255");
  31
  32             imageData = dstContext.getImageData(1, 0, 1, 1);
  33             imgdata = imageData.data;
  34             shouldBe("imgdata[0]", "0");
  35             shouldBe("imgdata[1]", "0");
  36             shouldBe("imgdata[2]", "0");
  37             shouldBe("imgdata[3]", "0");
  38
  39             imageData = dstContext.getImageData(0, 1, 1, 1);
  40             imgdata = imageData.data;
  41             shouldBe("imgdata[0]", "0");
  42             shouldBe("imgdata[1]", "0");
  43             shouldBe("imgdata[2]", "0");
  44             shouldBe("imgdata[3]", "0");
  45     </script>
  46 </body>
  47 </html>