1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/image/test/browser/browser_bug666317.js Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,62 @@
1.4 +waitForExplicitFinish();
1.5 +
1.6 +let pageSource =
1.7 + '<html><body>' +
1.8 + '<img id="testImg" src="' + TESTROOT + 'big.png">' +
1.9 + '</body></html>';
1.10 +
1.11 +let oldDiscardingPref, oldTab, newTab;
1.12 +let prefBranch = Cc["@mozilla.org/preferences-service;1"]
1.13 + .getService(Ci.nsIPrefService)
1.14 + .getBranch('image.mem.');
1.15 +
1.16 +function isImgDecoded() {
1.17 + let img = gBrowser.getBrowserForTab(newTab).contentWindow
1.18 + .document.getElementById('testImg');
1.19 + img.QueryInterface(Ci.nsIImageLoadingContent);
1.20 + let request = img.getRequest(Ci.nsIImageLoadingContent.CURRENT_REQUEST);
1.21 + return request.imageStatus & Ci.imgIRequest.STATUS_FRAME_COMPLETE ? true : false;
1.22 +}
1.23 +
1.24 +// Ensure that the image is decoded by drawing it to a canvas.
1.25 +function forceDecodeImg() {
1.26 + let doc = gBrowser.getBrowserForTab(newTab).contentWindow.document;
1.27 + let img = doc.getElementById('testImg');
1.28 + let canvas = doc.createElement('canvas');
1.29 + let ctx = canvas.getContext('2d');
1.30 + ctx.drawImage(img, 0, 0);
1.31 +}
1.32 +
1.33 +function test() {
1.34 + // Enable the discarding pref.
1.35 + oldDiscardingPref = prefBranch.getBoolPref('discardable');
1.36 + prefBranch.setBoolPref('discardable', true);
1.37 +
1.38 + // Create and focus a new tab.
1.39 + oldTab = gBrowser.selectedTab;
1.40 + newTab = gBrowser.addTab('data:text/html,' + pageSource);
1.41 + gBrowser.selectedTab = newTab;
1.42 +
1.43 + // Run step2 after the tab loads.
1.44 + gBrowser.getBrowserForTab(newTab)
1.45 + .addEventListener("pageshow", step2 );
1.46 +}
1.47 +
1.48 +function step2() {
1.49 + // Check that the image is decoded.
1.50 + forceDecodeImg();
1.51 + ok(isImgDecoded(), 'Image should initially be decoded.');
1.52 +
1.53 + // Focus the old tab, then fire a memory-pressure notification. This should
1.54 + // cause the decoded image in the new tab to be discarded.
1.55 + gBrowser.selectedTab = oldTab;
1.56 + var os = Cc["@mozilla.org/observer-service;1"]
1.57 + .getService(Ci.nsIObserverService);
1.58 + os.notifyObservers(null, 'memory-pressure', 'heap-minimize');
1.59 + ok(!isImgDecoded(), 'Image should be discarded.');
1.60 +
1.61 + // And we're done.
1.62 + gBrowser.removeTab(newTab);
1.63 + prefBranch.setBoolPref('discardable', oldDiscardingPref);
1.64 + finish();
1.65 +}
