image/test/mochitest/child.html

   1 <!DOCTYPE html>
   2 <meta charset=utf-8>
   3 <script src="imgutils.js"></script>
   4 <img id="img" src="animated1.gif">
   5 <script>
   6   let observer = new ImageDecoderObserverStub();
   7   observer.decodeComplete = () => {
   8     parent.postMessage("decodeComplete", "*");
   9   };
  10   observer.loadComplete = () => {
  11     parent.postMessage("loadComplete", "*");
  12   };
  13   observer = SpecialPowers.wrapCallbackObject(observer);
  14   const gObserver = SpecialPowers.Cc["@mozilla.org/image/tools;1"]
  15                                  .getService(SpecialPowers.Ci.imgITools)
  16                                  .createScriptedObserver(observer);
  17   const img = document.getElementById("img");
  18   SpecialPowers.wrap(img).addObserver(gObserver);
  19   window.addEventListener("unload", () => {
  20     SpecialPowers.wrap(img).removeObserver(gObserver);
  21   });
  22 </script>