Imgui: Add a new default font (VeraMono - 49kb) that scales better than the old default.

Allow loading a custom font by naming it OSD_Font.ttf and placing the file in the User/Load folder, to load that font instead. Useful for future testing.

Source/Core/VideoCommon/OnScreenUI.cpp

@@ -3,7 +3,9 @@
 
 #include "VideoCommon/OnScreenUI.h"
 
+#include "Common/CommonPaths.h"
 #include "Common/EnumMap.h"
+#include "Common/FileUtil.h"
 #include "Common/Profiler.h"
 #include "Common/Timer.h"
 
@@ -74,11 +76,28 @@ bool OnScreenUI::Initialize(u32 width, u32 height, float scale)
   }
 
   // Font defaults
+  ImGuiIO& io = ImGui::GetIO();
   m_imgui_textures.clear();
 
-  // Setup new font management behavior.
-  ImGui::GetIO().BackendFlags |=
-      ImGuiBackendFlags_RendererHasTextures | ImGuiBackendFlags_RendererHasVtxOffset;
+  // User supplied font
+  std::string file = File::GetUserPath(D_LOAD_IDX) + "OSD_Font.ttf";
+
+  bool font_exists = File::Exists(file);
+  if (!font_exists)
+  {
+    // Default supplied font
+    file = File::GetSysDirectory() + DIR_SEP + RESOURCES_DIR + DIR_SEP + "OSD_Font.ttf";
+    font_exists = File::Exists(file);
+  }
+
+  if (font_exists)
+  {
+    io.Fonts->Clear();
+    io.Fonts->AddFontFromFileTTF(file.c_str());
+  }
+
+  // Setup new font management behavior
+  io.BackendFlags |= ImGuiBackendFlags_RendererHasTextures | ImGuiBackendFlags_RendererHasVtxOffset;
 
   if (!RecompileImGuiPipeline())
     return false;
@@ -443,7 +462,6 @@ void OnScreenUI::UpdateImguiTexture(ImTextureData* tex)
     tex->SetTexID(static_cast<ImTextureID>(*font_tex.get()));
     // Keeps the texture alive.
     m_imgui_textures.push_back(std::move(font_tex));
-
     tex->SetStatus(ImTextureStatus_OK);
   }
   else if (tex->Status == ImTextureStatus_WantUpdates)