Log: Avoid making strings that won't be printed

When we switched to `fmt` for logging, the log functions were
implemented in such a way that the strings were always constructed,
even if log priority was such that they weren't ever logged.

Source/controls/plrctrls.cpp

@@ -1484,7 +1484,7 @@ std::string_view ControlTypeToString(ControlTypes controlType)
 
 void LogControlDeviceAndModeChange(ControlTypes newControlDevice, ControlTypes newControlMode)
 {
-	if (SDL_LOG_PRIORITY_VERBOSE < SDL_LogGetPriority(SDL_LOG_CATEGORY_APPLICATION))
+	if (SDL_LogGetPriority(SDL_LOG_CATEGORY_APPLICATION) > SDL_LOG_PRIORITY_VERBOSE)
 		return;
 	if (newControlDevice == ControlDevice && newControlMode == ControlMode)
 		return;
@@ -1514,7 +1514,7 @@ std::string_view GamepadTypeToString(GamepadLayout gamepadLayout)
 
 void LogGamepadChange(GamepadLayout newGamepad)
 {
-	if (SDL_LOG_PRIORITY_VERBOSE < SDL_LogGetPriority(SDL_LOG_CATEGORY_APPLICATION))
+	if (SDL_LogGetPriority(SDL_LOG_CATEGORY_APPLICATION) > SDL_LOG_PRIORITY_VERBOSE)
 		return;
 	constexpr auto DebugChange = [](GamepadLayout before, GamepadLayout after) -> std::string {
 		if (before == after)

Source/engine/assets.cpp

@@ -41,7 +41,7 @@ char *FindUnpackedMpqFile(char *relativePath)
 #else
 bool IsDebugLogging()
 {
-	return SDL_LOG_PRIORITY_DEBUG >= SDL_LogGetPriority(SDL_LOG_CATEGORY_APPLICATION);
+	return SDL_LogGetPriority(SDL_LOG_CATEGORY_APPLICATION) <= SDL_LOG_PRIORITY_DEBUG;
 }
 
 SDL_RWops *OpenOptionalRWops(const std::string &path)

Source/utils/log.hpp

@@ -73,6 +73,7 @@ void Log(std::string_view fmt, Args &&...args)
 template <typename... Args>
 void LogVerbose(LogCategory category, std::string_view fmt, Args &&...args)
 {
+	if (SDL_LogGetPriority(static_cast<int>(category)) > SDL_LOG_PRIORITY_VERBOSE) return;
 	auto str = detail::format(fmt, std::forward<Args>(args)...);
 	SDL_LogVerbose(static_cast<int>(category), "%s", str.c_str());
 }
@@ -86,6 +87,7 @@ void LogVerbose(std::string_view fmt, Args &&...args)
 template <typename... Args>
 void LogDebug(LogCategory category, std::string_view fmt, Args &&...args)
 {
+	if (SDL_LogGetPriority(static_cast<int>(category)) > SDL_LOG_PRIORITY_DEBUG) return;
 	auto str = detail::format(fmt, std::forward<Args>(args)...);
 	SDL_LogDebug(static_cast<int>(category), "%s", str.c_str());
 }

Source/utils/sdl2_to_1_2_backports.cpp

@@ -168,7 +168,7 @@ void SDL_LogMessage(int category, SDL_LogPriority priority, const char *fmt, ...
 
 void SDL_LogMessageV(int category, SDL_LogPriority priority, const char *fmt, va_list ap)
 {
-	if (static_cast<int>(priority) < 0 || priority >= SDL_NUM_LOG_PRIORITIES || priority < SDL_LogGetPriority(category))
+	if (static_cast<int>(priority) < 0 || priority >= SDL_NUM_LOG_PRIORITIES || SDL_LogGetPriority(category) > priority)
 		return;
 
 	::devilution::printfInConsole("%s: ", SDL_priority_prefixes[priority]);