UE4 C++ 获取DPI的值

#include "Runtime/Engine/Classes/Engine/UserInterfaceSettings.h"
#include "Runtime/Engine/Classes/Engine/RendererSettings.h"

const FVector2D viewportSize = FVector2D(GEngine->GameViewport->Viewport->GetSizeXY());
const float viewportScale = GetDefault(UUserInterfaceSettings::StaticClass())->GetDPIScalebasedOnSize(FIntPoint(viewportSize.X, viewportSize.Y));