Function pointers and LibraryImport

binding/Binding.Shared/DelegateProxies.shared.cs

@@ -25,20 +25,6 @@ internal static partial class DelegateProxies
 	{
 		// normal delegates
 
-		[MethodImpl (MethodImplOptions.AggressiveInlining)]
-		public static T Create<T> (object managedDel, T nativeDel, out GCHandle gch, out IntPtr contextPtr)
-		{
-			if (managedDel == null) {
-				gch = default (GCHandle);
-				contextPtr = IntPtr.Zero;
-				return default (T);
-			}
-
-			gch = GCHandle.Alloc (managedDel);
-			contextPtr = GCHandle.ToIntPtr (gch);
-			return nativeDel;
-		}
-
 		[MethodImpl (MethodImplOptions.AggressiveInlining)]
 		public static void Create (object managedDel, out GCHandle gch, out IntPtr contextPtr)
 		{

binding/HarfBuzzSharp/Blob.cs

@@ -1,7 +1,6 @@
 #nullable disable
 
 using System;
-using System.ComponentModel;
 using System.IO;
 
 namespace HarfBuzzSharp
@@ -84,7 +83,8 @@ public static unsafe Blob FromStream (Stream stream)
 
 		private static IntPtr Create (IntPtr data, int length, MemoryMode mode, ReleaseDelegate releaseProc)
 		{
-			var proxy = DelegateProxies.Create (releaseProc, DelegateProxies.ReleaseDelegateProxy, out _, out var ctx);
+			DelegateProxies.Create (releaseProc, out _, out var ctx);
+			var proxy = releaseProc != null ? DelegateProxies.DestroyProxy : null;
 			return HarfBuzzApi.hb_blob_create ((void*)data, (uint)length, mode, (void*)ctx, proxy);
 		}
 

binding/HarfBuzzSharp/DelegateProxies.cs

@@ -1,7 +1,9 @@
 #nullable disable
 
 using System;
-using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+// ReSharper disable PartialMethodParameterNameMismatch
 
 namespace HarfBuzzSharp
 {
@@ -11,15 +13,7 @@ namespace HarfBuzzSharp
 
 	internal static unsafe partial class DelegateProxies
 	{
-		// references to the proxy implementations
-		public static readonly DestroyProxyDelegate ReleaseDelegateProxy = ReleaseDelegateProxyImplementation;
-		public static readonly DestroyProxyDelegate ReleaseDelegateProxyForMulti = ReleaseDelegateProxyImplementationForMulti;
-		public static readonly ReferenceTableProxyDelegate GetTableDelegateProxy = GetTableDelegateProxyImplementation;
-
-		// internal proxy implementations
-
-		[MonoPInvokeCallback (typeof (DestroyProxyDelegate))]
-		private static void ReleaseDelegateProxyImplementation (void* context)
+		private static partial void DestroyProxyImplementation (void* context)
 		{
 			var del = Get<ReleaseDelegate> ((IntPtr)context, out var gch);
 			try {
@@ -29,16 +23,7 @@ private static void ReleaseDelegateProxyImplementation (void* context)
 			}
 		}
 
-		[MonoPInvokeCallback (typeof (ReferenceTableProxyDelegate))]
-		private static IntPtr GetTableDelegateProxyImplementation (IntPtr face, uint tag, void* context)
-		{
-			GetMultiUserData<GetTableDelegate, Face> ((IntPtr)context, out var getTable, out var userData, out _);
-			var blob = getTable.Invoke (userData, tag);
-			return blob?.Handle ?? IntPtr.Zero;
-		}
-
-		[MonoPInvokeCallback (typeof (DestroyProxyDelegate))]
-		private static void ReleaseDelegateProxyImplementationForMulti (void* context)
+		private static partial void DestroyProxyImplementationForMulti (void* context)
 		{
 			var del = GetMulti<ReleaseDelegate> ((IntPtr)context, out var gch);
 			try {
@@ -47,5 +32,12 @@ private static void ReleaseDelegateProxyImplementationForMulti (void* context)
 				gch.Free ();
 			}
 		}
+
+		private static partial IntPtr ReferenceTableProxyImplementation (IntPtr face, uint tag, void* context)
+		{
+			GetMultiUserData<GetTableDelegate, Face> ((IntPtr)context, out var getTable, out var userData, out _);
+			var blob = getTable.Invoke (userData, tag);
+			return blob?.Handle ?? IntPtr.Zero;
+		}
 	}
 }

binding/HarfBuzzSharp/DelegateProxies.font.cs

@@ -1,4 +1,5 @@
 #nullable disable
+// ReSharper disable PartialMethodParameterNameMismatch
 
 using System;
 
@@ -30,24 +31,9 @@ namespace HarfBuzzSharp
 
 	internal static unsafe partial class DelegateProxies
 	{
-		// references to the proxy implementations
-		public static readonly FontGetFontExtentsProxyDelegate FontExtentsProxy = FontExtentsProxyImplementation;
-		public static readonly FontGetNominalGlyphProxyDelegate NominalGlyphProxy = NominalGlyphProxyImplementation;
-		public static readonly FontGetVariationGlyphProxyDelegate VariationGlyphProxy = VariationGlyphProxyImplementation;
-		public static readonly FontGetNominalGlyphsProxyDelegate NominalGlyphsProxy = NominalGlyphsProxyImplementation;
-		public static readonly FontGetGlyphAdvanceProxyDelegate GlyphAdvanceProxy = GlyphAdvanceProxyImplementation;
-		public static readonly FontGetGlyphAdvancesProxyDelegate GlyphAdvancesProxy = GlyphAdvancesProxyImplementation;
-		public static readonly FontGetGlyphOriginProxyDelegate GlyphOriginProxy = GlyphOriginProxyImplementation;
-		public static readonly FontGetGlyphKerningProxyDelegate GlyphKerningProxy = GlyphKerningProxyImplementation;
-		public static readonly FontGetGlyphExtentsProxyDelegate GlyphExtentsProxy = GlyphExtentsProxyImplementation;
-		public static readonly FontGetGlyphContourPointProxyDelegate GlyphContourPointProxy = GlyphContourPointProxyImplementation;
-		public static readonly FontGetGlyphNameProxyDelegate GlyphNameProxy = GlyphNameProxyImplementation;
-		public static readonly FontGetGlyphFromNameProxyDelegate GlyphFromNameProxy = GlyphFromNameProxyImplementation;
-
 		// internal proxy implementations
 
-		[MonoPInvokeCallback (typeof (FontGetFontExtentsProxyDelegate))]
-		private static bool FontExtentsProxyImplementation (IntPtr font, void* fontData, FontExtents* extents, void* context)
+		private static partial bool FontGetFontExtentsProxyImplementation (IntPtr font, void* fontData, FontExtents* extents, void* context)
 		{
 			var del = GetMulti<FontExtentsDelegate> ((IntPtr)context, out _);
 			var userData = GetMultiUserData<FontUserData> ((IntPtr)fontData, out _);
@@ -57,8 +43,7 @@ private static bool FontExtentsProxyImplementation (IntPtr font, void* fontData,
 			return result;
 		}
 
-		[MonoPInvokeCallback (typeof (FontGetNominalGlyphProxyDelegate))]
-		private static bool NominalGlyphProxyImplementation (IntPtr font, void* fontData, uint unicode, uint* glyph, void* context)
+		private static partial bool FontGetNominalGlyphProxyImplementation (IntPtr font, void* fontData, uint unicode, uint* glyph, void* context)
 		{
 			var del = GetMulti<NominalGlyphDelegate> ((IntPtr)context, out _);
 			var userData = GetMultiUserData<FontUserData> ((IntPtr)fontData, out _);
@@ -68,8 +53,7 @@ private static bool NominalGlyphProxyImplementation (IntPtr font, void* fontData
 			return result;
 		}
 
-		[MonoPInvokeCallback (typeof (FontGetNominalGlyphsProxyDelegate))]
-		private static uint NominalGlyphsProxyImplementation (IntPtr font, void* fontData, uint count, uint* firstUnicode, uint unicodeStride, uint* firstGlyph, uint glyphStride, void* context)
+		private static partial uint FontGetNominalGlyphsProxyImplementation (IntPtr font, void* fontData, uint count, uint* firstUnicode, uint unicodeStride, uint* firstGlyph, uint glyphStride, void* context)
 		{
 			var del = GetMulti<NominalGlyphsDelegate> ((IntPtr)context, out _);
 			var unicodes = new ReadOnlySpan<uint> (firstUnicode, (int)count);
@@ -78,8 +62,7 @@ private static uint NominalGlyphsProxyImplementation (IntPtr font, void* fontDat
 			return del.Invoke (userData.Font, userData.FontData, count, unicodes, glyphs);
 		}
 
-		[MonoPInvokeCallback (typeof (FontGetVariationGlyphProxyDelegate))]
-		private static bool VariationGlyphProxyImplementation (IntPtr font, void* fontData, uint unicode, uint variationSelector, uint* glyph, void* context)
+		private static partial bool FontGetVariationGlyphProxyImplementation (IntPtr font, void* fontData, uint unicode, uint variationSelector, uint* glyph, void* context)
 		{
 			var del = GetMulti<VariationGlyphDelegate> ((IntPtr)context, out _);
 			var userData = GetMultiUserData<FontUserData> ((IntPtr)fontData, out _);
@@ -89,16 +72,14 @@ private static bool VariationGlyphProxyImplementation (IntPtr font, void* fontDa
 			return result;
 		}
 
-		[MonoPInvokeCallback (typeof (FontGetGlyphAdvanceProxyDelegate))]
-		private static int GlyphAdvanceProxyImplementation (IntPtr font, void* fontData, uint glyph, void* context)
+		private static partial int FontGetGlyphAdvanceProxyImplementation (IntPtr font, void* fontData, uint glyph, void* context)
 		{
 			var del = GetMulti<GlyphAdvanceDelegate> ((IntPtr)context, out _);
 			var userData = GetMultiUserData<FontUserData> ((IntPtr)fontData, out _);
 			return del.Invoke (userData.Font, userData.FontData, glyph);
 		}
 
-		[MonoPInvokeCallback (typeof (FontGetGlyphAdvancesProxyDelegate))]
-		private static void GlyphAdvancesProxyImplementation (IntPtr font, void* fontData, uint count, uint* firstGlyph, uint glyphStride, int* firstAdvance, uint advanceStride, void* context)
+		private static partial void FontGetGlyphAdvancesProxyImplementation (IntPtr font, void* fontData, uint count, uint* firstGlyph, uint glyphStride, int* firstAdvance, uint advanceStride, void* context)
 		{
 			var del = GetMulti<GlyphAdvancesDelegate> ((IntPtr)context, out _);
 			var glyphs = new ReadOnlySpan<uint> (firstGlyph, (int)count);
@@ -107,8 +88,7 @@ private static void GlyphAdvancesProxyImplementation (IntPtr font, void* fontDat
 			del.Invoke (userData.Font, userData.FontData, count, glyphs, advances);
 		}
 
-		[MonoPInvokeCallback (typeof (FontGetGlyphOriginProxyDelegate))]
-		private static bool GlyphOriginProxyImplementation (IntPtr font, void* fontData, uint glyph, int* x, int* y, void* context)
+		private static partial bool FontGetGlyphOriginProxyImplementation (IntPtr font, void* fontData, uint glyph, int* x, int* y, void* context)
 		{
 			var del = GetMulti<GlyphOriginDelegate> ((IntPtr)context, out _);
 			var userData = GetMultiUserData<FontUserData> ((IntPtr)fontData, out _);
@@ -120,16 +100,14 @@ private static bool GlyphOriginProxyImplementation (IntPtr font, void* fontData,
 			return result;
 		}
 
-		[MonoPInvokeCallback (typeof (FontGetGlyphKerningProxyDelegate))]
-		private static int GlyphKerningProxyImplementation (IntPtr font, void* fontData, uint firstGlyph, uint secondGlyph, void* context)
+		private static partial int FontGetGlyphKerningProxyImplementation (IntPtr font, void* fontData, uint firstGlyph, uint secondGlyph, void* context)
 		{
 			var del = GetMulti<GlyphKerningDelegate> ((IntPtr)context, out _);
 			var userData = GetMultiUserData<FontUserData> ((IntPtr)fontData, out _);
 			return del.Invoke (userData.Font, userData.FontData, firstGlyph, secondGlyph);
 		}
 
-		[MonoPInvokeCallback (typeof (FontGetGlyphExtentsProxyDelegate))]
-		private static bool GlyphExtentsProxyImplementation (IntPtr font, void* fontData, uint glyph, GlyphExtents* extents, void* context)
+		private static partial bool FontGetGlyphExtentsProxyImplementation (IntPtr font, void* fontData, uint glyph, GlyphExtents* extents, void* context)
 		{
 			var del = GetMulti<GlyphExtentsDelegate> ((IntPtr)context, out _);
 			var userData = GetMultiUserData<FontUserData> ((IntPtr)fontData, out _);
@@ -139,8 +117,7 @@ private static bool GlyphExtentsProxyImplementation (IntPtr font, void* fontData
 			return result;
 		}
 
-		[MonoPInvokeCallback (typeof (FontGetGlyphContourPointProxyDelegate))]
-		private static bool GlyphContourPointProxyImplementation (IntPtr font, void* fontData, uint glyph, uint pointIndex, int* x, int* y, void* context)
+		private static partial bool FontGetGlyphContourPointProxyImplementation (IntPtr font, void* fontData, uint glyph, uint pointIndex, int* x, int* y, void* context)
 		{
 			var del = GetMulti<GlyphContourPointDelegate> ((IntPtr)context, out _);
 			var userData = GetMultiUserData<FontUserData> ((IntPtr)fontData, out _);
@@ -152,8 +129,7 @@ private static bool GlyphContourPointProxyImplementation (IntPtr font, void* fon
 			return result;
 		}
 
-		[MonoPInvokeCallback (typeof (FontGetGlyphNameProxyDelegate))]
-		private static bool GlyphNameProxyImplementation (IntPtr font, void* fontData, uint glyph, void* nameBuffer, uint size, void* context)
+		private static partial bool FontGetGlyphNameProxyImplementation (IntPtr font, void* fontData, uint glyph, void* nameBuffer, uint size, void* context)
 		{
 			var del = GetMulti<GlyphNameDelegate> ((IntPtr)context, out _);
 			var userData = GetMultiUserData<FontUserData> ((IntPtr)fontData, out _);
@@ -166,8 +142,7 @@ private static bool GlyphNameProxyImplementation (IntPtr font, void* fontData, u
 			return result;
 		}
 
-		[MonoPInvokeCallback (typeof (FontGetGlyphFromNameProxyDelegate))]
-		private static bool GlyphFromNameProxyImplementation (IntPtr font, void* fontData, void* name, int len, uint* glyph, void* context)
+		private static partial bool FontGetGlyphFromNameProxyImplementation (IntPtr font, void* fontData, void* name, int len, uint* glyph, void* context)
 		{
 			var del = GetMulti<GlyphFromNameDelegate> ((IntPtr)context, out _);
 			var userData = GetMultiUserData<FontUserData> ((IntPtr)fontData, out _);

binding/HarfBuzzSharp/DelegateProxies.unicode.cs

@@ -1,6 +1,9 @@
 #nullable disable
+// ReSharper disable PartialMethodParameterNameMismatch
 
 using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 
 namespace HarfBuzzSharp
 {
@@ -18,43 +21,31 @@ namespace HarfBuzzSharp
 
 	internal static unsafe partial class DelegateProxies
 	{
-		public static readonly UnicodeCombiningClassProxyDelegate CombiningClassProxy = CombiningClassProxyImplementation;
-		public static readonly UnicodeGeneralCategoryProxyDelegate GeneralCategoryProxy = GeneralCategoryProxyImplementation;
-		public static readonly UnicodeMirroringProxyDelegate MirroringProxy = MirroringProxyImplementation;
-		public static readonly UnicodeScriptProxyDelegate ScriptProxy = ScriptProxyImplementation;
-		public static readonly UnicodeComposeProxyDelegate ComposeProxy = ComposeProxyImplementation;
-		public static readonly UnicodeDecomposeProxyDelegate DecomposeProxy = DecomposeProxyImplementation;
-
-		[MonoPInvokeCallback (typeof (UnicodeCombiningClassProxyDelegate))]
-		private static int CombiningClassProxyImplementation (IntPtr ufuncs, uint unicode, void* context)
+		private static partial int UnicodeCombiningClassProxyImplementation (IntPtr ufuncs, uint unicode, void* context)
 		{
 			GetMultiUserData<CombiningClassDelegate, UnicodeFunctions> ((IntPtr)context, out var del, out var functions, out _);
 			return (int)del.Invoke (functions, unicode);
 		}
 
-		[MonoPInvokeCallback (typeof (UnicodeGeneralCategoryProxyDelegate))]
-		private static int GeneralCategoryProxyImplementation (IntPtr ufuncs, uint unicode, void* context)
+		private static partial int UnicodeGeneralCategoryProxyImplementation (IntPtr ufuncs, uint unicode, void* context)
 		{
 			GetMultiUserData<GeneralCategoryDelegate, UnicodeFunctions> ((IntPtr)context, out var del, out var functions, out _);
 			return (int)del.Invoke (functions, unicode);
 		}
 
-		[MonoPInvokeCallback (typeof (UnicodeMirroringProxyDelegate))]
-		private static uint MirroringProxyImplementation (IntPtr ufuncs, uint unicode, void* context)
+		private static partial uint UnicodeMirroringProxyImplementation (IntPtr ufuncs, uint unicode, void* context)
 		{
 			GetMultiUserData<MirroringDelegate, UnicodeFunctions> ((IntPtr)context, out var del, out var functions, out _);
 			return del.Invoke (functions, unicode);
 		}
 
-		[MonoPInvokeCallback (typeof (UnicodeScriptProxyDelegate))]
-		private static uint ScriptProxyImplementation (IntPtr ufuncs, uint unicode, void* context)
+		private static partial uint UnicodeScriptProxyImplementation (IntPtr ufuncs, uint unicode, void* context)
 		{
 			GetMultiUserData<ScriptDelegate, UnicodeFunctions> ((IntPtr)context, out var del, out var functions, out _);
 			return del.Invoke (functions, unicode);
 		}
 
-		[MonoPInvokeCallback (typeof (UnicodeComposeProxyDelegate))]
-		private static bool ComposeProxyImplementation (IntPtr ufuncs, uint a, uint b, uint* ab, void* context)
+		private static partial bool UnicodeComposeProxyImplementation (IntPtr ufuncs, uint a, uint b, uint* ab, void* context)
 		{
 			GetMultiUserData<ComposeDelegate, UnicodeFunctions> ((IntPtr)context, out var del, out var functions, out _);
 			var result = del.Invoke (functions, a, b, out var abManaged);
@@ -63,8 +54,7 @@ private static bool ComposeProxyImplementation (IntPtr ufuncs, uint a, uint b, u
 			return result;
 		}
 
-		[MonoPInvokeCallback (typeof (UnicodeDecomposeProxyDelegate))]
-		private static bool DecomposeProxyImplementation (IntPtr ufuncs, uint ab, uint* a, uint* b, void* context)
+		private static partial bool UnicodeDecomposeProxyImplementation (IntPtr ufuncs, uint ab, uint* a, uint* b, void* context)
 		{
 			GetMultiUserData<DecomposeDelegate, UnicodeFunctions> ((IntPtr)context, out var del, out var functions, out _);
 			var result = del.Invoke (functions, ab, out var aManaged, out var bManaged);

binding/HarfBuzzSharp/Face.cs

@@ -41,9 +41,9 @@ public Face (GetTableDelegate getTable, ReleaseDelegate destroy)
 				throw new ArgumentNullException (nameof (getTable));
 
 			Handle = HarfBuzzApi.hb_face_create_for_tables (
-				DelegateProxies.GetTableDelegateProxy,
+				DelegateProxies.ReferenceTableProxy,
 				(void*)DelegateProxies.CreateMultiUserData (getTable, destroy, this),
-				DelegateProxies.ReleaseDelegateProxyForMulti);
+				DelegateProxies.DestroyProxyForMulti);
 		}
 
 		internal Face (IntPtr handle)

binding/HarfBuzzSharp/Font.cs

@@ -54,7 +54,7 @@ public void SetFontFunctions (FontFunctions fontFunctions, object fontData, Rele
 
 			var container = new FontUserData (this, fontData);
 			var ctx = DelegateProxies.CreateMultiUserData (destroy, container);
-			HarfBuzzApi.hb_font_set_funcs (Handle, fontFunctions.Handle, (void*)ctx, DelegateProxies.ReleaseDelegateProxyForMulti);
+			HarfBuzzApi.hb_font_set_funcs (Handle, fontFunctions.Handle, (void*)ctx, DelegateProxies.DestroyProxyForMulti);
 		}
 
 		public void GetScale (out int xScale, out int yScale)