weather: Add function for converting to display temp

Handles rounding correctly.

Author: FintasticMan

src/components/ble/SimpleWeatherService.h

@@ -62,12 +62,14 @@ namespace Pinetime {
       };
 
       using Location = std::array<char, 33>; // 32 char + \0 (end of string)
+      using PreciseTemp = int16_t;
+      using DisplayTemp = int16_t;
 
       struct CurrentWeather {
         CurrentWeather(uint64_t timestamp,
-                       int16_t temperature,
-                       int16_t minTemperature,
-                       int16_t maxTemperature,
+                       PreciseTemp temperature,
+                       PreciseTemp minTemperature,
+                       PreciseTemp maxTemperature,
                        Icons iconId,
                        Location&& location)
           : timestamp {timestamp},
@@ -79,9 +81,9 @@ namespace Pinetime {
         }
 
         uint64_t timestamp;
-        int16_t temperature;
-        int16_t minTemperature;
-        int16_t maxTemperature;
+        PreciseTemp temperature;
+        PreciseTemp minTemperature;
+        PreciseTemp maxTemperature;
         Icons iconId;
         Location location;
 
@@ -93,8 +95,8 @@ namespace Pinetime {
         uint8_t nbDays;
 
         struct Day {
-          int16_t minTemperature;
-          int16_t maxTemperature;
+          PreciseTemp minTemperature;
+          PreciseTemp maxTemperature;
           Icons iconId;
 
           bool operator==(const Day& other) const;
@@ -108,10 +110,14 @@ namespace Pinetime {
       std::optional<CurrentWeather> Current() const;
       std::optional<Forecast> GetForecast() const;
 
-      static int16_t CelsiusToFahrenheit(int16_t celsius) {
+      static PreciseTemp CelsiusToFahrenheit(PreciseTemp celsius) {
         return celsius * 9 / 5 + 3200;
       }
 
+      static DisplayTemp Convert(PreciseTemp temp) {
+        return temp = temp / 100 + (temp % 100 >= 50 ? 1 : 0);
+      }
+
     private:
       // 00050000-78fc-48fe-8e23-433b3a1942d0
       static constexpr ble_uuid128_t BaseUuid() {

src/displayapp/screens/WatchFaceDigital.cpp

@@ -174,14 +174,14 @@ void WatchFaceDigital::Refresh() {
   if (currentWeather.IsUpdated()) {
     auto optCurrentWeather = currentWeather.Get();
     if (optCurrentWeather) {
-      int16_t temp = optCurrentWeather->temperature;
+      Controllers::SimpleWeatherService::PreciseTemp preciseTemp = optCurrentWeather->temperature;
       char tempUnit = 'C';
       if (settingsController.GetWeatherFormat() == Controllers::Settings::WeatherFormat::Imperial) {
-        temp = Controllers::SimpleWeatherService::CelsiusToFahrenheit(temp);
+        preciseTemp = Controllers::SimpleWeatherService::CelsiusToFahrenheit(preciseTemp);
         tempUnit = 'F';
       }
-      temp = temp / 100 + (temp % 100 >= 50 ? 1 : 0);
-      lv_label_set_text_fmt(temperature, "%d°%c", temp, tempUnit);
+      Controllers::SimpleWeatherService::DisplayTemp displayTemp = Controllers::SimpleWeatherService::Convert(preciseTemp);
+      lv_label_set_text_fmt(temperature, "%d°%c", displayTemp, tempUnit);
       lv_label_set_text(weatherIcon, Symbols::GetSymbol(optCurrentWeather->iconId));
     } else {
       lv_label_set_text_static(temperature, "");

src/displayapp/screens/WatchFacePineTimeStyle.cpp

@@ -543,12 +543,12 @@ void WatchFacePineTimeStyle::Refresh() {
   if (currentWeather.IsUpdated()) {
     auto optCurrentWeather = currentWeather.Get();
     if (optCurrentWeather) {
-      int16_t temp = optCurrentWeather->temperature;
+      Controllers::SimpleWeatherService::PreciseTemp preciseTemp = optCurrentWeather->temperature;
       if (settingsController.GetWeatherFormat() == Controllers::Settings::WeatherFormat::Imperial) {
-        temp = Controllers::SimpleWeatherService::CelsiusToFahrenheit(temp);
+        preciseTemp = Controllers::SimpleWeatherService::CelsiusToFahrenheit(preciseTemp);
       }
-      temp = temp / 100 + (temp % 100 >= 50 ? 1 : 0);
-      lv_label_set_text_fmt(temperature, "%d°", temp);
+      Controllers::SimpleWeatherService::DisplayTemp displayTemp = Controllers::SimpleWeatherService::Convert(preciseTemp);
+      lv_label_set_text_fmt(temperature, "%d°", displayTemp);
       lv_label_set_text(weatherIcon, Symbols::GetSymbol(optCurrentWeather->iconId));
     } else {
       lv_label_set_text(temperature, "--");