Add drawing types templates

src/Microsoft.Windows.CsWin32/Generator.cs

@@ -50,12 +50,20 @@ public class Generator : IDisposable
         { "LARGE_INTEGER", PredefinedType(Token(SyntaxKind.LongKeyword)) },
         { "ULARGE_INTEGER", PredefinedType(Token(SyntaxKind.ULongKeyword)) },
         { "OVERLAPPED", ParseTypeName("global::System.Threading.NativeOverlapped") },
+        { "POINT", ParseTypeName("global::System.Drawing.Point") },
+        { "POINTF", ParseTypeName("global::System.Drawing.PointF") },
     };
 
+    /// <summary>
+    /// A map of .NET interop structs to use, keyed by the native structs that should <em>not</em> be generated <em>when marshaling is enabled.</em>
+    /// That is, these interop types should only be generated when marshaling is disabled.
+    /// </summary>
+    /// <devremarks>
+    /// When adding to this dictionary, consider also adding to <see cref="BannedAPIsWithMarshaling"/>.
+    /// </devremarks>
     internal static readonly Dictionary<string, TypeSyntax> AdditionalBclInteropStructsMarshaled = new Dictionary<string, TypeSyntax>(StringComparer.Ordinal)
     {
         { nameof(System.Runtime.InteropServices.ComTypes.IDataObject), ParseTypeName("global::System.Runtime.InteropServices.ComTypes.IDataObject") },
-        ////{ "BOOL", PredefinedType(TokenWithSpace(SyntaxKind.BoolKeyword)) },
     };
 
     internal static readonly Dictionary<string, TypeSyntax> BclInteropSafeHandles = new Dictionary<string, TypeSyntax>(StringComparer.Ordinal)
@@ -408,13 +416,21 @@ private enum FriendlyOverloadOf
         InterfaceMethod,
     }
 
+    /// <summary>
+    /// Gets a map of interop APIs that should never be generated, whether marshaling is allowed or not, and messages to emit in diagnostics if these APIs are ever directly requested.
+    /// </summary>
     internal static ImmutableDictionary<string, string> BannedAPIsWithoutMarshaling { get; } = ImmutableDictionary<string, string>.Empty
         .Add("GetLastError", "Do not generate GetLastError. Call Marshal.GetLastWin32Error() instead. Learn more from https://docs.microsoft.com/dotnet/api/system.runtime.interopservices.marshal.getlastwin32error")
         .Add("OLD_LARGE_INTEGER", "Use the C# long keyword instead.")
         .Add("LARGE_INTEGER", "Use the C# long keyword instead.")
         .Add("ULARGE_INTEGER", "Use the C# ulong keyword instead.")
-        .Add("OVERLAPPED", "Use System.Threading.NativeOverlapped instead.");
+        .Add("OVERLAPPED", "Use System.Threading.NativeOverlapped instead.")
+        .Add("POINT", "Use System.Drawing.Point instead.")
+        .Add("POINTF", "Use System.Drawing.PointF instead.");
 
+    /// <summary>
+    /// Gets a map of interop APIs that should not be generated when marshaling is allowed, and messages to emit in diagnostics if these APIs are ever directly requested.
+    /// </summary>
     internal static ImmutableDictionary<string, string> BannedAPIsWithMarshaling { get; } = BannedAPIsWithoutMarshaling
         .Add("VARIANT", "Use `object` instead of VARIANT when in COM interface mode. VARIANT can only be emitted when emitting COM interfaces as structs.");
 
@@ -3659,6 +3675,16 @@ private StructDeclarationSyntax DeclareStruct(TypeDefinitionHandle typeDefHandle
         // Add the additional members, taking care to not introduce redundant declarations.
         members.AddRange(additionalMembers.Where(c => c is not StructDeclarationSyntax cs || !members.OfType<StructDeclarationSyntax>().Any(m => m.Identifier.ValueText == cs.Identifier.ValueText)));
 
+        switch (name.Identifier.ValueText)
+        {
+            case "RECT":
+            case "SIZE":
+                members.AddRange(this.ExtractMembersFromTemplate(name.Identifier.ValueText));
+                break;
+            default:
+                break;
+        }
+
         StructDeclarationSyntax result = StructDeclaration(name.Identifier)
             .AddMembers(members.ToArray())
             .WithModifiers(TokenList(TokenWithSpace(this.Visibility), TokenWithSpace(SyntaxKind.PartialKeyword)));

src/Microsoft.Windows.CsWin32/templates/RECT.cs

@@ -0,0 +1,26 @@
+partial struct RECT
+{
+	internal RECT(global::System.Drawing.Rectangle value) :
+		this(value.Left, value.Top, value.Right, value.Bottom) { }
+	internal RECT(global::System.Drawing.Point location, global::System.Drawing.Size size) :
+		this(location.X, location.Y, unchecked(location.X + size.Width), unchecked(location.Y + size.Height)) { }
+	internal RECT(int left, int top, int right, int bottom)
+	{
+		this.left = left;
+		this.top = top;
+		this.right = right;
+		this.bottom = bottom;
+	}
+
+	internal static RECT FromXYWH(int x, int y, int width, int height) =>
+		new RECT(x, y, unchecked(x + width), unchecked(y + height));
+	internal readonly int Width => unchecked(this.right - this.left);
+	internal readonly int Height => unchecked(this.bottom - this.top);
+	internal readonly bool IsEmpty => this.left == 0 && this.top == 0 && this.right == 0 && this.bottom == 0;
+	internal readonly int X => this.left;
+	internal readonly int Y => this.top;
+	internal readonly global::System.Drawing.Size Size => new global::System.Drawing.Size(this.Width, this.Height);
+	public static implicit operator global::System.Drawing.Rectangle(RECT value) => new global::System.Drawing.Rectangle(value.left, value.top, value.Width, value.Height);
+	public static implicit operator global::System.Drawing.RectangleF(RECT value) => new global::System.Drawing.RectangleF(value.left, value.top, value.Width, value.Height);
+	public static implicit operator RECT(global::System.Drawing.Rectangle value) => new RECT(value);
+}

src/Microsoft.Windows.CsWin32/templates/SIZE.cs

@@ -0,0 +1,15 @@
+partial struct SIZE
+{
+	internal SIZE(global::System.Drawing.Size value) : this(value.Width, value.Height) { }
+	internal SIZE(int width, int height)
+	{
+		this.cx = width;
+		this.cy = height;
+	}
+
+	internal readonly int Width => this.cx;
+	internal readonly int Height => this.cy;
+	internal readonly bool IsEmpty => this.cx == 0 && this.cy == 0;
+	public static implicit operator global::System.Drawing.Size(SIZE value) => new global::System.Drawing.Size(value.cx, value.cy);
+	public static implicit operator SIZE(global::System.Drawing.Size value) => new SIZE(value);
+}

test/GenerationSandbox.Tests/NativeMethods.txt

@@ -1,5 +1,7 @@
 BOOL
 BOOLEAN
+RECT
+SIZE
 CHAR
 CreateCursor
 CreateFile

test/GenerationSandbox.Tests/SystemDrawingStructTests.cs

@@ -0,0 +1,77 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.Drawing;
+using Windows.Win32.Foundation;
+
+public class SystemDrawingStructTests
+{
+    [Fact]
+    public void Size()
+    {
+        SIZE s = new SIZE(1, 1);
+        Size s2 = s;
+        Assert.False(s.IsEmpty);
+        Assert.False(s2.IsEmpty);
+
+        Assert.True(default(SIZE).IsEmpty);
+    }
+
+    [Fact]
+    public void NotLossyConversionBetweenSizeAndSIZE()
+    {
+        SIZE nativeSize = new SIZE(1, 1);
+        Size managedSize = nativeSize;
+        SIZE roundtrippedNativeSize = managedSize;
+        Assert.Equal(nativeSize, roundtrippedNativeSize);
+    }
+
+    [Fact]
+    public void NotLossyConversionBetweenSizeAndSIZE_Ctors()
+    {
+        SIZE nativeSize = new SIZE(1, 1);
+        Size managedSize = nativeSize;
+        SIZE roundtrippedNativeSize = new SIZE(managedSize);
+        Assert.Equal(nativeSize, roundtrippedNativeSize);
+    }
+
+    [Fact]
+    public void Rect()
+    {
+        RECT r = new RECT(1, 1, 2, 2);
+        Rectangle r2 = r;
+        Assert.False(r.IsEmpty);
+        Assert.False(r2.IsEmpty);
+
+        Assert.True(default(RECT).IsEmpty);
+    }
+
+    [Fact]
+    public void NotLossyConversionBetweenRectangleAndRECT()
+    {
+        RECT nativeSize = new RECT(1, 1, 2, 2);
+        Rectangle managedSize = nativeSize;
+        RECT roundtrippedNativeSize = managedSize;
+        Assert.Equal(nativeSize, roundtrippedNativeSize);
+    }
+
+    [Fact]
+    public void NotLossyConversionBetweenRectangleAndRECT_Ctors()
+    {
+        RECT nativeSize = new RECT(1, 1, 2, 2);
+        Rectangle managedSize = nativeSize;
+        RECT roundtrippedNativeSize = new RECT(managedSize);
+        Assert.Equal(nativeSize, roundtrippedNativeSize);
+    }
+
+    [Fact]
+    public void RectangleAndRECTFromXYWH_AreEqual()
+    {
+        RECT nativeSize = RECT.FromXYWH(1, 1, 2, 2);
+        Rectangle managedSize = new Rectangle(1, 1, 2, 2);
+        Assert.Equal(nativeSize.left, managedSize.Left);
+        Assert.Equal(nativeSize.right, managedSize.Right);
+        Assert.Equal(nativeSize.top, managedSize.Top);
+        Assert.Equal(nativeSize.bottom, managedSize.Bottom);
+    }
+}