Fix cairo's image inversion and alpha misapplication. - #11724

So there is no test for this?

No CI.

@meeseeksdev backport to v2.2.x

Owee, I'm MrMeeseeks, Look at me.

There seem to be a conflict, please backport manually. Here are approximate instructions:

1. Checkout backport branch and update it.

$ git checkout v2.2.x
$ git pull

2. Cherry pick the first parent branch of the this PR on top of the older branch:

$ git cherry-pick -m1 a373dc3d1a4bede2803f02ca4d82336cc19da9e4

3. You will likely have some merge/cherry-pick conflict here, fix them and commit:

$ git commit -am "Backport PR #11724: Fix cairo's image inversion and alpha misapplication."

4. Push to a named branch :

git push YOURFORK v2.2.x:auto-backport-of-pr-11724-on-v2.2.x

5. Create a PR against branch v2.2.x, I would have named this PR:

"Backport PR #11724 on branch v2.2.x"

And apply the correct labels and milestones.

Congratulation you did some good work ! Hopefully your backport PR will be tested by the continuous integration and merged soon!

If these instruction are inaccurate, feel free to suggest an improvement.

This did not get backported to 2.2.x, but did make it in to 3.0.0, re-milestoned as such.