Make font loading optional

Author: MartinHelmut

src/core/CMakeLists.txt

@@ -5,7 +5,8 @@ include(${PROJECT_SOURCE_DIR}/cmake/StaticAnalyzers.cmake)
 add_library(${NAME} STATIC
   Core/Log.cpp Core/Log.hpp Core/Debug/Instrumentor.hpp
   Core/Application.cpp Core/Application.hpp Core/Window.cpp Core/Window.hpp
-  Core/Resources.hpp Core/DPIHandler.hpp)
+  Core/Resources.hpp Core/Resources.cpp
+  Core/DPIHandler.hpp)
 
 # Define set of OS specific files to include
 if (CMAKE_SYSTEM_NAME STREQUAL "Windows")

src/core/Core/Application.cpp

@@ -66,8 +66,13 @@ ExitStatus App::Application::run() {
   const float font_size{18.0F * font_scaling_factor};
   const std::string font_path{Resources::font_path("Manrope.ttf").generic_string()};
 
-  io.Fonts->AddFontFromFileTTF(font_path.c_str(), font_size);
-  io.FontDefault = io.Fonts->AddFontFromFileTTF(font_path.c_str(), font_size);
+  if (Resources::exists(font_path)) {
+    io.Fonts->AddFontFromFileTTF(font_path.c_str(), font_size);
+    io.FontDefault = io.Fonts->AddFontFromFileTTF(font_path.c_str(), font_size);
+  } else {
+    APP_WARN("Could not find font file under: {}", font_path.c_str());
+  }
+
   DPIHandler::set_global_font_scaling(&io);
 
   // Setup Platform/Renderer backends

src/core/Core/Resources.cpp

@@ -0,0 +1,18 @@
+#include "Core/Resources.hpp"
+
+#include <sys/stat.h>
+
+#include <filesystem>
+
+#include "Core/Debug/Instrumentor.hpp"
+
+namespace App {
+
+bool Resources::exists(const std::filesystem::path& pathname) {
+  APP_PROFILE_FUNCTION();
+
+  struct stat buffer;
+  return (stat(pathname.generic_string().c_str(), &buffer) == 0);
+}
+
+}  // namespace App

src/core/Core/Resources.hpp

@@ -9,6 +9,7 @@ class Resources {
  public:
   [[nodiscard]] static std::filesystem::path resource_path(const std::filesystem::path& file_path);
   [[nodiscard]] static std::filesystem::path font_path(const std::string_view& font_file);
+  [[nodiscard]] static bool exists(const std::filesystem::path& pathname);
 };
 
 }  // namespace App