qfc: use integers as storage, not floats

Float mantissa has 23 bits. 9 bits get wasted per value. Instead, use
uint16_t that doesn't lose much precision, but saves half the space.

1 files changed, 5 insertions, 1 deletions

diff --git a/qfunctionconfigurator/functionconfig.h b/qfunctionconfigurator/functionconfig.h
index 446c73ac..68ec2869 100644
--- a/qfunctionconfigurator/functionconfig.h
+++ b/qfunctionconfigurator/functionconfig.h
@@ -14,16 +14,19 @@
 #include <QSettings>
 #include <QMutex>
 #include <vector>
+#include <limits>
 #include "opentrack-compat/qcopyable-mutex.hpp"
 
 class Map {
 private:
     static constexpr int value_count = 5000;
     using num = float;
+    using integral = std::uint16_t;
+    static constexpr integral integral_max = std::numeric_limits<integral>::max();
 
     struct State {
         QList<QPointF> input;
-        std::vector<num> data;
+        std::vector<integral> data;
     };
 
     int precision() const;
@@ -45,6 +48,7 @@ public:
     {
         setMaxInput(maxx);
         setMaxOutput(maxy);
+        reload();
     }
 
     num getValue(num x);