third_party/WebKit/LayoutTests/fast/canvas/canvas-ImageData-behaviour.js

   1 description("Series of tests to ensure correct behaviour of the ImageData object");
   2
   3 imageData = document.getElementById("canvas").getContext("2d").getImageData(0,0,2,2);
   4
   5 shouldBe("imageData.width", "2");
   6 shouldBe("imageData.height", "2");
   7 shouldBe("imageData.data.length", "16");
   8 for (var i = 0; i < imageData.data.length; i++)
   9     shouldBe("imageData.data["+i+"]", "0");
  10
  11 var testValues = [NaN, true, false, "\"garbage\"", "-1",
  12                   "\"0\"", "\"1\"", "\"2\"", Infinity, -Infinity,
  13                   -5, -0.5, 0, 0.5, 5,
  14                   5.4, 255, 256, null, undefined];
  15 var testResults = [0, 1, 0, 0, 0,
  16                    0, 1, 2, 255, 0,
  17                    0, 0, 0, 0, 5,
  18                    5, 255, 255, 0, 0];
  19 for (var i = 0; i < testValues.length; i++) {
  20     shouldBe("imageData.data[0] = "+testValues[i]+", imageData.data[0]", ""+testResults[i]);
  21 }
  22
  23 shouldBe("imageData.data['foo']='garbage',imageData.data['foo']", "'garbage'");
  24 shouldBe("imageData.data[-1]='garbage',imageData.data[-1]", "undefined");
  25 shouldBe("imageData.data[17]='garbage',imageData.data[17]", "undefined");