third_party/WebKit/ManualTests/canvas-large-temporary.html

   1 <html>
   2 <head>
   3 <script src="../LayoutTests/fast/js/resources/js-test-pre.js"></script>
   4 </head>
   5 <body>
   6 <script>
   7 description("Test to verify that serial allocation and dereferencing of large canvases will succeed");
   8 // This is a manual test because it runs too slow as a LayoutTest, especially for GPU tests with mesa.
   9
  10 // 32 canvases of 8k x 8k will consume 8GB of RAM.
  11 // Garbage collection should kick-in to prevent OOM failures.
  12 for (var i = 0; i < 32; i++) {
  13     var canvas = document.createElement('canvas');
  14     canvas.width = 8192;
  15     canvas.height = 8192;
  16     // Draw to trigger lazy backing store allocation
  17     var ctx = canvas.getContext('2d');
  18     ctx.fillStyle = '#0f0';
  19     ctx.fillRect(0, 0, 1, 1);
  20     // Verify that allocation succeeded by verifying that draw succeeded
  21     var imageData = ctx.getImageData(0, 0, 1, 1);
  22     var imgdata = imageData.data;
  23     shouldBe("imgdata[0]", "0");
  24     shouldBe("imgdata[1]", "255");
  25     shouldBe("imgdata[2]", "0");
  26 }
  27 </script>
  28 <script src="../LayoutTests/fast/js/resources/js-test-post.js"></script>
  29 </body>
  30 </html>