third_party/WebKit/LayoutTests/http/tests/misc/canvas-pattern-from-incremental-image.html

   1 Tests that incomplete (not fully loaded/decoded) images cannot be used to create a CanvasPattern.<br/><br/>
   2 <script>
   3 if (window.testRunner)
   4     testRunner.dumpAsText();
   5
   6 var canvas = document.createElement("canvas");
   7 var ctx = canvas.getContext('2d');
   8 ctx.fillRect(0,0,150,150);
   9 var img = new Image();
  10 img.src = 'resources/image-slow.pl';
  11 var ptrn
  12 try {
  13     ptrn = ctx.createPattern(img, 'repeat');
  14     if (!img.complete)
  15         document.write("PASS - image is not complete");
  16     else
  17         document.write("FAIL - image is complete");
  18     document.write("<br/>");
  19     if (!ptrn)
  20         document.write("PASS - createPattern() failed for incomplete image");
  21     else
  22         document.write("FAIL - createPattern() succeeded for incomplete image");
  23 } catch (e) {
  24     document.write("FAIL - caught exception: " + e);
  25 }
  26 </script>