fixes/2042-opengl-using-pixelsize-struct

src/Avalonia.OpenGL/EglGlPlatformSurface.cs

@@ -7,8 +7,7 @@ namespace Avalonia.OpenGL
         public interface IEglWindowGlPlatformSurfaceInfo
         {
             IntPtr Handle { get; }
-            // TODO: Change to PixelSize struct once https://github.com/AvaloniaUI/Avalonia/pull/1889 is merged
-            System.Drawing.Size PixelSize { get; }
+            PixelSize Size { get; }
             double Scaling { get; }
         }
 
@@ -71,7 +70,7 @@ namespace Avalonia.OpenGL
                 }
 
                 public IGlDisplay Display => _context.Display;
-                public System.Drawing.Size PixelSize => _info.PixelSize;
+                public PixelSize Size => _info.Size;
                 public double Scaling => _info.Scaling;
             }
         }

src/Avalonia.OpenGL/IGlPlatformSurfaceRenderingSession.cs

@@ -5,8 +5,7 @@ namespace Avalonia.OpenGL
     public interface IGlPlatformSurfaceRenderingSession : IDisposable
     {
         IGlDisplay Display { get; }
-        // TODO: Change to PixelSize struct once https://github.com/AvaloniaUI/Avalonia/pull/1889 is merged
-        System.Drawing.Size PixelSize { get; }
+        PixelSize Size { get; }
         double Scaling { get; }
     }
-}
+}

src/Skia/Avalonia.Skia/GlRenderTarget.cs

@@ -28,7 +28,7 @@ namespace Avalonia.Skia
             var gl = disp.GlInterface;
             gl.GetIntegerv(GL_FRAMEBUFFER_BINDING, out var fb);
 
-            var size = session.PixelSize;
+            var size = session.Size;
             var scaling = session.Scaling;
 
             GRBackendRenderTargetDesc desc = new GRBackendRenderTargetDesc