From 9f895c3f14e7420cbbf354168f5ae48488ab1060 Mon Sep 17 00:00:00 2001
From: gibbed <rick@gibbed.us>
Date: Thu, 22 Nov 2018 08:30:30 -0600
Subject: [PATCH] [UI] Use DPI APIs when available.

---
 src/xenia/ui/window_win.cc | 21 +++++++++++++++++----
 src/xenia/ui/window_win.h  |  3 +++
 2 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/src/xenia/ui/window_win.cc b/src/xenia/ui/window_win.cc
index 50216fc57..9941cb221 100644
--- a/src/xenia/ui/window_win.cc
+++ b/src/xenia/ui/window_win.cc
@@ -47,12 +47,20 @@ bool Win32Window::Initialize() { return OnCreate(); }
 bool Win32Window::OnCreate() {
   HINSTANCE hInstance = GetModuleHandle(nullptr);
 
+  if (!SetProcessDpiAwareness_ || !GetDpiForMonitor_) {
+    auto shcore = GetModuleHandle(L"shcore.dll");
+    if (shcore) {
+      SetProcessDpiAwareness_ =
+          GetProcAddress(shcore, "SetProcessDpiAwareness");
+      GetDpiForMonitor_ = GetProcAddress(shcore, "GetDpiForMonitor");
+    }
+  }
+
   static bool has_registered_class = false;
   if (!has_registered_class) {
     // Tell Windows that we're DPI aware.
-    auto spda = (decltype(&SetProcessDpiAwareness))GetProcAddress(
-        GetModuleHandle(L"shcore.dll"), "SetProcessDpiAwareness");
-    if (spda) {
+    if (SetProcessDpiAwareness_) {
+      auto spda = (decltype(&SetProcessDpiAwareness))SetProcessDpiAwareness_;
       auto res = spda(PROCESS_PER_MONITOR_DPI_AWARE);
       if (res != S_OK) {
         XELOGE("Failed to set process DPI awareness. (code = 0x%.8X)", res);
@@ -303,11 +311,16 @@ void Win32Window::set_bordered(bool enabled) {
 }
 
 int Win32Window::get_dpi() const {
+  if (!GetDpiForMonitor_) {
+    return 96;
+  }
+
   HMONITOR monitor = MonitorFromWindow(hwnd_, MONITOR_DEFAULTTOPRIMARY);
 
   // According to msdn, x and y are identical...
   UINT dpi_x, dpi_y;
-  GetDpiForMonitor(monitor, MDT_DEFAULT, &dpi_x, &dpi_y);
+  auto gdfm = (decltype(&GetDpiForMonitor))GetDpiForMonitor_;
+  gdfm(monitor, MDT_DEFAULT, &dpi_x, &dpi_y);
   return dpi_x;
 }
 
diff --git a/src/xenia/ui/window_win.h b/src/xenia/ui/window_win.h
index 1c6373124..d885042ea 100644
--- a/src/xenia/ui/window_win.h
+++ b/src/xenia/ui/window_win.h
@@ -85,6 +85,9 @@ class Win32Window : public Window {
 
   WINDOWPLACEMENT windowed_pos_ = {0};
   POINT last_mouse_pos_ = {0};
+
+  void* SetProcessDpiAwareness_ = nullptr;
+  void* GetDpiForMonitor_ = nullptr;
 };
 
 class Win32MenuItem : public MenuItem {