compat/options: fix and simplify slider support

- Introduce rounding. Before, slider pos didn't correspond to the saved
setting until it "converged" several saves later.
- Move copy-pasted code to .cpp file.

1 files changed, 2 insertions, 0 deletions

diff --git a/opentrack-compat/options.hpp b/opentrack-compat/options.hpp
index 3e5ecbf4..86c699d6 100644
--- a/opentrack-compat/options.hpp
+++ b/opentrack-compat/options.hpp
@@ -65,6 +65,8 @@ namespace options
         double cur() const { return cur_; }
         double min() const { return min_; }
         double max() const { return max_; }
+        slider_value update_from_slider(int pos, int q_min, int q_max) const;
+        int to_slider_pos(int q_min, int q_max) const;
     };
 }