[krita] [Bug 445561] Krita 5 16bit integer colorspace canvas rendering is broken on M1

[vanyossi]

https://bugs.kde.org/show_bug.cgi?id=445561

--- Comment #11 from vanyossi <ghevan at gmail.com> ---
1) unchecked texture buffers fixes the rendering problem as suspected (as a
quick fix we could force texture buffers off if 16bit integer is used)
3) applying patch and recompiling also fixes the issue (texture buffers is
checked but the patch turns it off).
4) Bug is present as expected
5) I've already tested if the buffer and data sizes would differ or not, which
did not. The ASSERT as expected does not trigger and printing values shows the
size is as expected: lower or equal. 

I tried to find  where there could be a wrong calculation related to the
changes from that commit, and could not make it behave differently other than
total black, transparent or crashes. Could it be the problem is inside
qtopenglbuffer? I mean native arm qt for macos is official in 6.2 version and
they are planning on releasing 5.15 somewhere in the future. However I could
not find a bug report related.

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