third_party/WebKit/LayoutTests/fast/canvas/canvas-context-attributes-default-value.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4 <script src="../../resources/js-test.js"></script>
   5 <script>
   6
   7   var trueAttributes = {
   8     alpha : true,
   9   };
  10
  11   var falseAttributes = {
  12     alpha : false,
  13   };
  14
  15   function testAttributes(expectedAttributes, checkValue) {
  16
  17     if (arguments.length != 1 && arguments.length != 2)
  18       return;
  19
  20     var canvas = document.createElement("canvas");
  21     var initialAttributes = {};
  22     var isUndefinedOrNull = arguments.length == 2 &&
  23         (checkValue == undefined || checkValue == null);
  24
  25     if (isUndefinedOrNull)
  26       for (key in expectedAttributes)
  27         initialAttributes[key] = checkValue;
  28
  29     var context = canvas.getContext("2d", initialAttributes);
  30
  31     window.actualContextAttributes = context.getContextAttributes();
  32
  33     for (key in expectedAttributes)
  34       shouldBe("actualContextAttributes." + key,
  35           expectedAttributes[key].toString());
  36   }
  37
  38 </script>
  39 </head>
  40 <body>
  41 <script>
  42
  43   debug("Testing default value:");
  44   testAttributes(trueAttributes);
  45   debug("")
  46
  47   debug("Testing undefined value:");
  48   testAttributes(trueAttributes, undefined);
  49   debug("")
  50
  51   debug("Testing null value:");
  52   testAttributes(falseAttributes, null);
  53   debug("")
  54
  55 </script>
  56 </body>