GDIの関数でDPIを取得するのはコストが高いので、別の方法にすることにした

diff --git a/WPF/FooEditEngine/Direct2D/D2DRender.cs b/WPF/FooEditEngine/Direct2D/D2DRender.cs
index f8c57f0..65076b7 100644 (file)
--- a/WPF/FooEditEngine/Direct2D/D2DRender.cs
+++ b/WPF/FooEditEngine/Direct2D/D2DRender.cs
@@ -409,10 +409,11 @@ namespace FooEditEngine.WPF
 
         public override void GetDpi(out float dpix, out float dpiy)
         {
-            IntPtr hDc = NativeMethods.GetDC(IntPtr.Zero);
-            dpix = NativeMethods.GetDeviceCaps(hDc, NativeMethods.LOGPIXELSX);
-            dpiy = NativeMethods.GetDeviceCaps(hDc, NativeMethods.LOGPIXELSY);
-            NativeMethods.ReleaseDC(IntPtr.Zero, hDc);
+            var dpiXProperty = typeof(SystemParameters).GetProperty("DpiX", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);
+            var dpiYProperty = typeof(SystemParameters).GetProperty("Dpi", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);
+
+            dpix = (int)dpiXProperty.GetValue(null, null);
+            dpiy = (int)dpiYProperty.GetValue(null, null);
         }
 
         protected override void DestructRender()