test_bug490949.html (3169B)
1 <!DOCTYPE HTML> 2 <html> 3 <!-- 4 https://bugzilla.mozilla.org/show_bug.cgi?id=490949 5 --> 6 <head> 7 <title>Test for Bug 490949</title> 8 <script src="/tests/SimpleTest/SimpleTest.js"></script> 9 <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> 10 </head> 11 <body> 12 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=490949">Mozilla Bug 490949</a> 13 <p id="display"></p> 14 <div id="content" style="display: none"> 15 <canvas id="canvas" width="100" height="100"> </canvas> 16 </div> 17 <pre id="test"> 18 <script type="application/javascript"> 19 20 SimpleTest.waitForExplicitFinish(); 21 22 var canvas = document.getElementById('canvas'); 23 var first, second, third; 24 25 var RemoteCanvas = function() { 26 this.url = "bug490949-iframe.html"; 27 }; 28 29 RemoteCanvas.CANVAS_WIDTH = 100; 30 RemoteCanvas.CANVAS_HEIGHT = 100; 31 32 RemoteCanvas.prototype.load = function(cb) { 33 this.cb = cb; 34 35 var windowWidth = window.innerWidth - 25; 36 var iframe; 37 iframe = document.createElement("iframe"); 38 iframe.id = "test-iframe"; 39 iframe.height = "10px"; 40 iframe.width = windowWidth + "px"; 41 iframe.style.visibility = "hidden"; 42 iframe.src = this.url; 43 // Here is where the magic happens... add a listener to the 44 // frame's onload event - it will call handleEvent 45 iframe.addEventListener("load", this, true); 46 // append to the end of the page 47 window.document.body.appendChild(iframe); 48 }; 49 50 RemoteCanvas.prototype.reload = function(cb, force) { 51 this.cb = cb; 52 window.frames[0].location.reload(force); 53 } 54 55 RemoteCanvas.prototype.handleEvent = function() { 56 // Look back up the iframe by id 57 var ldrFrame = document.getElementById("test-iframe"); 58 // Get a reference to the window object you need for the 59 // SpecialPowers.snapshotRect method 60 var remoteWindow = ldrFrame.contentWindow; 61 62 // Draw canvas 63 canvas.style.width = RemoteCanvas.CANVAS_WIDTH + "px"; 64 canvas.style.height = RemoteCanvas.CANVAS_HEIGHT + "px"; 65 canvas.width = RemoteCanvas.CANVAS_WIDTH; 66 canvas.height = RemoteCanvas.CANVAS_HEIGHT; 67 var windowWidth = window.innerWidth - 25; 68 var windowHeight = window.innerHeight; 69 70 var rect = { left: 0, top: 0, width: windowWidth, height: windowHeight }; 71 var snapshot = SpecialPowers.snapshotRect(remoteWindow, rect, "rgb(0,0,0)"); 72 73 var ctx = canvas.getContext("2d"); 74 ctx.clearRect(0, 0, 75 RemoteCanvas.CANVAS_WIDTH, 76 RemoteCanvas.CANVAS_HEIGHT); 77 ctx.save(); 78 ctx.scale(RemoteCanvas.CANVAS_WIDTH / windowWidth, 79 RemoteCanvas.CANVAS_HEIGHT / windowHeight); 80 ctx.drawImage(snapshot, 0, 0); 81 ctx.restore(); 82 this.cb(); 83 }; 84 85 function checkFirst() 86 { 87 first = canvas.toDataURL(); 88 remoteCanvas.reload(checkForceReload, true); 89 } 90 91 function checkForceReload() 92 { 93 second = canvas.toDataURL(); 94 ok(first != second, "We got the wrong image."); 95 remoteCanvas.reload(checkLazyReload, false); 96 } 97 98 function checkLazyReload() 99 { 100 third = canvas.toDataURL(); 101 ok(second != third, "We got the wrong image."); 102 SimpleTest.finish(); 103 } 104 105 var remoteCanvas = new RemoteCanvas(); 106 remoteCanvas.load(checkFirst); 107 108 </script> 109 </pre> 110 </body> 111 </html>