lzh/noVNC
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Approximate comparison of JPEG result

Browse Source 
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
parent 113fa27ebc
commit 3762300399
2 changed files with 17 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tests/test.tight.js
+12 -7
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();