th_lua_ui.h

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#ifndef CORSIX_TH_TH_LUA_UI_H_
#define CORSIX_TH_TH_LUA_UI_H_
 
#include "config.h"
 
#include <algorithm>
#include <cassert>
 
 
constexpr uint8_t map_color_channel(int low, int high, int val, int start,
                                    int end) {
  assert(low < high);
  assert(start >= 0 && start <= 0xFF);
  assert(end >= 0 && end <= 0xFF);
 
  if (val <= low) {
    return start;
  }
  if (val >= high) {
    return end;
  }
 
  return static_cast<uint8_t>(start +
                              (end - start) * (val - low) / (high - low));
}
 
#endif  // CORSIX_TH_TH_LUA_UI_H_