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| author | ThibG <thib@sitedethib.com> | 2020-11-18 18:01:58 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2020-11-18 18:01:58 +0100 |
| commit | d8d43a427a549cf063de3f6b3c22a08a06f53ffa (patch) | |
| tree | b1aa09485c274950685e91cf48d176319711fe68 /db/migrate/20171114231651_create_lists.rb | |
| parent | 18ca4e0e9a3f74a6f21d329882b429f8f5227b0f (diff) | |
Fix image uploads being random data when canvas read access is blocked (#15180)
Fixes #15178 PR #11499 introduced a way to deal with all-white canvas, but newer Firefox versions set random data instead. This PR detects whether canvas operations are reliable by comparing the results on a hardcoded 2×2 pixels image, and memoizing the result. This should be both more reliable and faster than the previous check.
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