Make windows DPI aware to display properly on high-resolution screens. (#1983)

* Make Windows DPI aware to display properly on high-resolution screens.

* remove empty line

* Don't use app manifest, set process dpi aware programatically.

Store variables in Program.cs for use instead of re-creating them per class/ method.

* Fix for linux/osx

* Add braces

* Re-use manifest. It appears to be required on linux.

* Undo previous commit -- it appears linux was simply never affected.

* Addressed AcK's comments

* Remove unused usings

* Address comments by AcK #2

* Re-order

* Move FromHwnd call to ForceDpiAware class. Wrap in Try-Catch to prevent crashes on systems that don't support it.

* Additional code cleanup

* Remove "global::" reference.

1 files changed, 45 insertions, 0 deletions

diff --git a/Ryujinx.Common/System/ForceDpiAware.cs b/Ryujinx.Common/System/ForceDpiAware.cs
new file mode 100644
index 00000000..81c69376
--- /dev/null
+++ b/Ryujinx.Common/System/ForceDpiAware.cs
@@ -0,0 +1,45 @@
+using Ryujinx.Common.Logging;
+using System;
+using System.Drawing;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Common.System
+{
+    public static class ForceDpiAware
+    {
+        [DllImport("user32.dll")]
+        private static extern bool SetProcessDPIAware();
+
+        private static readonly double _standardDpiScale = 96.0;
+        private static readonly double _maxScaleFactor   = 1.25;
+
+        /// <summary>
+        /// Marks the application as DPI-Aware when running on the Windows operating system.
+        /// </summary>
+        public static void Windows()
+        {
+            // Make process DPI aware for proper window sizing on high-res screens.
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows) && Environment.OSVersion.Version.Major >= 6)
+            {
+                SetProcessDPIAware();
+            }
+        }
+
+        public static double GetWindowScaleFactor()
+        {
+            double userDpiScale;
+
+            try
+            {
+                userDpiScale = Graphics.FromHwnd(IntPtr.Zero).DpiX;
+            }
+            catch (Exception e)
+            {
+                Logger.Warning?.Print(LogClass.Application, $"Couldn't determine monitor DPI: {e.Message}");
+                userDpiScale = 96.0;
+            }
+
+            return Math.Min(userDpiScale / _standardDpiScale, _maxScaleFactor);
+        }
+    }
+}