Nico Weber 88d0702763 AK: Make ceil_div() handle one argument being negative correctly ...

`ceil_div(-1, 2)` used to return -1.
Now it returns 0, which is the correct ceil(-0.5).

(C++'s division semantics have floor semantics for numbers > 0,
but ceil semantics for numbers < 0.)

This will be important for the JPEG2000 decoder eventually.

2024-04-27 07:09:08 +02:00

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