The Tor Browser / file comparison
comparison: image/test/browser/browser_bug666317.js
image/test/browser/browser_bug666317.js
- branch
- TOR_BUG_9701
- changeset 14
- 925c144e1f1f
equal
deleted
inserted
replaced
| -1:000000000000 | 0:8cc0709093fd |
|---|---|
| 1 waitForExplicitFinish(); | |
| 2 | |
| 3 let pageSource = | |
| 4 '<html><body>' + | |
| 5 '<img id="testImg" src="' + TESTROOT + 'big.png">' + | |
| 6 '</body></html>'; | |
| 7 | |
| 8 let oldDiscardingPref, oldTab, newTab; | |
| 9 let prefBranch = Cc["@mozilla.org/preferences-service;1"] | |
| 10 .getService(Ci.nsIPrefService) | |
| 11 .getBranch('image.mem.'); | |
| 12 | |
| 13 function isImgDecoded() { | |
| 14 let img = gBrowser.getBrowserForTab(newTab).contentWindow | |
| 15 .document.getElementById('testImg'); | |
| 16 img.QueryInterface(Ci.nsIImageLoadingContent); | |
| 17 let request = img.getRequest(Ci.nsIImageLoadingContent.CURRENT_REQUEST); | |
| 18 return request.imageStatus & Ci.imgIRequest.STATUS_FRAME_COMPLETE ? true : false; | |
| 19 } | |
| 20 | |
| 21 // Ensure that the image is decoded by drawing it to a canvas. | |
| 22 function forceDecodeImg() { | |
| 23 let doc = gBrowser.getBrowserForTab(newTab).contentWindow.document; | |
| 24 let img = doc.getElementById('testImg'); | |
| 25 let canvas = doc.createElement('canvas'); | |
| 26 let ctx = canvas.getContext('2d'); | |
| 27 ctx.drawImage(img, 0, 0); | |
| 28 } | |
| 29 | |
| 30 function test() { | |
| 31 // Enable the discarding pref. | |
| 32 oldDiscardingPref = prefBranch.getBoolPref('discardable'); | |
| 33 prefBranch.setBoolPref('discardable', true); | |
| 34 | |
| 35 // Create and focus a new tab. | |
| 36 oldTab = gBrowser.selectedTab; | |
| 37 newTab = gBrowser.addTab('data:text/html,' + pageSource); | |
| 38 gBrowser.selectedTab = newTab; | |
| 39 | |
| 40 // Run step2 after the tab loads. | |
| 41 gBrowser.getBrowserForTab(newTab) | |
| 42 .addEventListener("pageshow", step2 ); | |
| 43 } | |
| 44 | |
| 45 function step2() { | |
| 46 // Check that the image is decoded. | |
| 47 forceDecodeImg(); | |
| 48 ok(isImgDecoded(), 'Image should initially be decoded.'); | |
| 49 | |
| 50 // Focus the old tab, then fire a memory-pressure notification. This should | |
| 51 // cause the decoded image in the new tab to be discarded. | |
| 52 gBrowser.selectedTab = oldTab; | |
| 53 var os = Cc["@mozilla.org/observer-service;1"] | |
| 54 .getService(Ci.nsIObserverService); | |
| 55 os.notifyObservers(null, 'memory-pressure', 'heap-minimize'); | |
| 56 ok(!isImgDecoded(), 'Image should be discarded.'); | |
| 57 | |
| 58 // And we're done. | |
| 59 gBrowser.removeTab(newTab); | |
| 60 prefBranch.setBoolPref('discardable', oldDiscardingPref); | |
| 61 finish(); | |
| 62 } |
