gecko/testing/mochitest/tests/SimpleTest/WindowSnapshot.js

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netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
var gWindowUtils;
try {
gWindowUtils = window.QueryInterface(CI.nsIInterfaceRequestor).getInterface(CI.nsIDOMWindowUtils);
if (gWindowUtils && !gWindowUtils.compareCanvases)
gWindowUtils = null;
} catch (e) {
gWindowUtils = null;
}
function snapshotWindow(win) {
var el = document.createElementNS("http://www.w3.org/1999/xhtml", "canvas");
el.width = win.innerWidth;
el.height = win.innerHeight;
// drawWindow requires privileges
netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
el.getContext("2d").drawWindow(win, win.scrollX, win.scrollY,
win.innerWidth, win.innerHeight,
"rgb(255,255,255)");
return el;
}
// If the two snapshots aren't equal, returns their serializations as data URIs.
function compareSnapshots(s1, s2) {
netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
var s1Str, s2Str;
var equal = false;
if (gWindowUtils) {
equal = (gWindowUtils.compareCanvases(s1, s2, {}) == 0);
}
if (!equal) {
s1Str = s1.toDataURL();
s2Str = s2.toDataURL();
if (!gWindowUtils) {
equal = (s1Str == s2Str);
}
}
return [equal, s1Str, s2Str];
}