<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=490949 --> <head> <title>Test for Bug 490949</title> <script type="application/javascript" src="/MochiKit/MochiKit.js"></script> <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> </head> <body> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=490949">Mozilla Bug 490949</a> <p id="display"></p> <div id="content" style="display: none"> <canvas id="canvas" width="100" height="100"> </canvas> </div> <pre id="test"> <script type="application/javascript"> SimpleTest.waitForExplicitFinish(); var canvas = document.getElementById('canvas'); var first, second, third; RemoteCanvas = function() { this.url = "bug490949-iframe.html"; }; RemoteCanvas.CANVAS_WIDTH = 100; RemoteCanvas.CANVAS_HEIGHT = 100; RemoteCanvas.prototype.load = function(cb) { this.cb = cb; var windowWidth = window.innerWidth - 25; var iframe; iframe = document.createElement("iframe"); iframe.id = "test-iframe"; iframe.height = "10px"; iframe.width = windowWidth + "px"; iframe.style.visibility = "hidden"; iframe.src = this.url; // Here is where the magic happens... add a listener to the // frame's onload event - it will call handleEvent iframe.addEventListener("load", this, true); //append to the end of the page window.document.body.appendChild(iframe); }; RemoteCanvas.prototype.reload = function(cb, force) { this.cb = cb; window.frames[0].location.reload(force); } RemoteCanvas.prototype.handleEvent = function() { // Look back up the iframe by id var ldrFrame = document.getElementById("test-iframe"); // Get a reference to the window object you need for the // SpecialPowers.snapshotRect method var remoteWindow = ldrFrame.contentWindow; //Draw canvas canvas.style.width = RemoteCanvas.CANVAS_WIDTH + "px"; canvas.style.height = RemoteCanvas.CANVAS_HEIGHT + "px"; canvas.width = RemoteCanvas.CANVAS_WIDTH; canvas.height = RemoteCanvas.CANVAS_HEIGHT; var windowWidth = window.innerWidth - 25; var windowHeight = window.innerHeight; var rect = { left: 0, top: 0, width: windowWidth, height: windowHeight }; var snapshot = SpecialPowers.snapshotRect(remoteWindow, rect, "rgb(0,0,0)"); var ctx = canvas.getContext("2d"); ctx.clearRect(0, 0, RemoteCanvas.CANVAS_WIDTH, RemoteCanvas.CANVAS_HEIGHT); ctx.save(); ctx.scale(RemoteCanvas.CANVAS_WIDTH / windowWidth, RemoteCanvas.CANVAS_HEIGHT / windowHeight); ctx.drawImage(snapshot, 0, 0); ctx.restore(); this.cb(); }; function checkFirst() { first = canvas.toDataURL(); remoteCanvas.reload(checkForceReload, true); } function checkForceReload() { second = canvas.toDataURL(); ok(first != second, "We got the wrong image."); remoteCanvas.reload(checkLazyReload, false); } function checkLazyReload() { third = canvas.toDataURL(); ok(second != third, "We got the wrong image."); SimpleTest.finish(); } var remoteCanvas = new RemoteCanvas(); remoteCanvas.load(checkFirst); </script> </pre> </body> </html>