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var gWindowUtils;
try {
gWindowUtils = SpecialPowers.getDOMWindowUtils(window);
if (gWindowUtils && !gWindowUtils.compareCanvases)
gWindowUtils = null;
} catch (e) {
gWindowUtils = null;
}
function snapshotWindow(win, withCaret) {
return SpecialPowers.snapshotWindow(win, withCaret);
}
function snapshotRect(win, rect) {
return SpecialPowers.snapshotRect(win, rect);
}
// If the two snapshots don't compare as expected (true for equal, false for
// unequal), returns their serializations as data URIs. In all cases, returns
// whether the comparison was as expected.
function compareSnapshots(s1, s2, expectEqual, fuzz) {
if (s1.width != s2.width || s1.height != s2.height) {
ok(false, "Snapshot canvases are not the same size - comparing them makes no sense");
return [false];
}
var passed = false;
var numDifferentPixels;
var maxDifference = { value: undefined };
if (gWindowUtils) {
var equal;
try {
numDifferentPixels = gWindowUtils.compareCanvases(s1, s2, maxDifference);
if (!fuzz) {
equal = (numDifferentPixels == 0);
} else {
equal = (numDifferentPixels <= fuzz.numDifferentPixels &&
maxDifference.value <= fuzz.maxDifference);
}
passed = (equal == expectEqual);
} catch (e) {
ok(false, "Exception thrown from compareCanvases: " + e);
}
}
var s1DataURI, s2DataURI;
if (!passed) {
s1DataURI = s1.toDataURL();
s2DataURI = s2.toDataURL();
if (!gWindowUtils) {
passed = ((s1DataURI == s2DataURI) == expectEqual);
}
}
return [passed, s1DataURI, s2DataURI, numDifferentPixels, maxDifference.value];
}
function assertSnapshots(s1, s2, expectEqual, fuzz, s1name, s2name) {
var [passed, s1DataURI, s2DataURI, numDifferentPixels, maxDifference] =
compareSnapshots(s1, s2, expectEqual, fuzz);
var sym = expectEqual ? "==" : "!=";
ok(passed, "reftest comparison: " + sym + " " + s1name + " " + s2name);
if (!passed) {
// The language / format in this message should match the failure messages
// displayed by reftest.js's "RecordResult()" method so that log output
// can be parsed by reftest-analyzer.xhtml
var report = "REFTEST TEST-UNEXPECTED-FAIL | " + s1name +
" | image comparison (" + sym + "), max difference: " +
maxDifference + ", number of differing pixels: " +
numDifferentPixels + "\n";
if (expectEqual) {
report += "REFTEST IMAGE 1 (TEST): " + s1DataURI + "\n";
report += "REFTEST IMAGE 2 (REFERENCE): " + s2DataURI + "\n";
} else {
report += "REFTEST IMAGE: " + s1DataURI + "\n";
}
dump(report);
}
return passed;
}
function assertWindowPureColor(win, color) {
const snapshot = SpecialPowers.snapshotRect(win);
const canvas = document.createElement("canvas");
canvas.width = snapshot.width;
canvas.height = snapshot.height;
const context = canvas.getContext("2d");
context.fillStyle = color;
context.fillRect(0, 0, canvas.width, canvas.height);
assertSnapshots(snapshot, canvas, true, null, "snapshot", color);
}
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