Fix int_fast16_t overflow

[ramon-bernardo]

Pull Request Prelude

• I have followed proper The Forgotten Server code styling.
• I have read and understood the contribution guidelines before making this PR.
• I am aware that this PR may be closed if the above-mentioned criteria are not fulfilled.

Changes Proposed

• Fix int_fast16_t overflow

[DSpeichert]

From the commit message, PR message and the code, I still have no idea what the problem is and what the fix fixes.

[ranisalt]

From the commit message, PR message and the code, I still have no idea what the problem is and what the fix fixes.

The range arguments are int32, but the result variable is int16, therefore overflow may occur if the range does not fit 16 bits. It doesn't usually happen, because the range is usually small (this function is heavy af, it usually runs with the viewport dimensions), but the conversion MAY hurt performance.

I would just use int everywhere.

[DSpeichert]

@ranisalt int or int32_t to keep it the same?

[ranisalt]

auto to avoid conversions, but int32_t between those (also avoids conversion)