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Approximate comparison of JPEG result

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The browsers have various rounding errors so we need to compare the
output data only approximately and not exactly.
This commit is contained in:
Pierre Ossman 2020-09-04 16:48:44 +02:00 committed by Lauri Kasanen
parent 073737c8ac
commit fcd7836a83
2 changed files with 17 additions and 9 deletions
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7
kasmweb/tests/assertions.js
View File

@ -1,6 +1,9 @@
// noVNC specific assertions
chai.use(function (_chai, utils) {
_chai.Assertion.addMethod('displayed', function (targetData) {
function _equal(a, b) {
return a === b;
}
_chai.Assertion.addMethod('displayed', function (targetData, cmp=_equal) {
const obj = this._obj;
const ctx = obj._target.getContext('2d');
const dataCl = ctx.getImageData(0, 0, obj._target.width, obj._target.height).data;
@ -10,7 +13,7 @@ chai.use(function (_chai, utils) {
new chai.Assertion(len).to.be.equal(targetData.length, "unexpected display size");
let same = true;
for (let i = 0; i < len; i++) {
if (data[i] != targetData[i]) {
if (!cmp(data[i], targetData[i])) {
same = false;
break;
}

19
kasmweb/tests/test.tight.js
View File

@ -365,17 +365,22 @@ describe('Tight Decoder', function () {
testDecodeRect(decoder, 0, 0, 4, 4, data, display, 24);
// We got some rounding errors when we compressed things,
// hence not perfect 0xff/0x00 values
let targetData = new Uint8Array([
0xfe, 0x00, 0x00, 255, 0xfe, 0x00, 0x00, 255, 0x00, 0xff, 0x01, 255, 0x00, 0xff, 0x01, 255,
0xfe, 0x00, 0x00, 255, 0xfd, 0x00, 0x00, 255, 0x00, 0xff, 0x01, 255, 0x01, 0xff, 0x02, 255,
0x00, 0xff, 0x01, 255, 0x00, 0xff, 0x01, 255, 0xfe, 0x00, 0x00, 255, 0xfe, 0x00, 0x00, 255,
0x00, 0xff, 0x01, 255, 0x01, 0xff, 0x00, 255, 0xfe, 0x00, 0x00, 255, 0xfd, 0x01, 0x00, 255
0xff, 0x00, 0x00, 255, 0xff, 0x00, 0x00, 255, 0x00, 0xff, 0x00, 255, 0x00, 0xff, 0x00, 255,
0xff, 0x00, 0x00, 255, 0xff, 0x00, 0x00, 255, 0x00, 0xff, 0x00, 255, 0x00, 0xff, 0x00, 255,
0x00, 0xff, 0x00, 255, 0x00, 0xff, 0x00, 255, 0xff, 0x00, 0x00, 255, 0xff, 0x00, 0x00, 255,
0x00, 0xff, 0x00, 255, 0x00, 0xff, 0x00, 255, 0xff, 0x00, 0x00, 255, 0xff, 0x00, 0x00, 255
]);
// Browsers have rounding errors, so we need an approximate
// comparing function
function almost(a, b) {
let diff = Math.abs(a - b);
return diff < 5;
}
display.onflush = () => {
expect(display).to.have.displayed(targetData);
expect(display).to.have.displayed(targetData, almost);
done();
};
display.flush();