Migrate DWrite FontCollectionLoader to managed.

Contributes to dotnet#5305

Author: ThomasGoulet73

src/Microsoft.DotNet.Wpf/src/DirectWriteForwarder/CPP/DWriteWrapper/DWriteInterfaces.h

@@ -150,38 +150,6 @@ namespace MS { namespace Internal { namespace Text { namespace TextInterface { n
             /*[Out, MarshalAs(UnmanagedType::Interface)]*/ IDWriteFontFile** fontFile
             );
     };
-    
-    /// <summary>
-    /// The font collection loader interface is used to construct a collection of fonts given a particular type of key.
-    /// The font collection loader interface is recommended to be implemented by a singleton object.
-    /// IMPORTANT: font collection loader implementations must not register themselves with DirectWrite factory
-    /// inside their constructors and must not unregister themselves in their destructors, because
-    /// registration and unregistraton operations increment and decrement the object reference count respectively.
-    /// Instead, registration and unregistration of font file loaders with DirectWrite factory should be performed
-    /// outside of the font file loader implementation as a separate step.
-    /// </summary>
-    [ComImport(), Guid("cca920e4-52f0-492b-bfa8-29c72ee0a468"), InterfaceType(ComInterfaceType::InterfaceIsIUnknown)]
-    interface class IDWriteFontCollectionLoaderMirror
-    {
-        /// <summary>
-        /// Creates a font file enumerator object that encapsulates a collection of font files.
-        /// The font system calls back to this interface to create a font collection.
-        /// </summary>
-        /// <param name="collectionKey">Font collection key that uniquely identifies the collection of font files within
-        /// the scope of the font collection loader being used.</param>
-        /// <param name="collectionKeySize">Size of the font collection key in bytes.</param>
-        /// <param name="fontFileEnumerator">Pointer to the newly created font file enumerator.</param>
-        /// <returns>
-        /// Standard HRESULT error code.
-        /// </returns>
-        [PreserveSig]
-        HRESULT CreateEnumeratorFromKey(
-            /*[In, MarshalAs(UnmanagedType::Interface)]*/ IntPtr factory,
-            [In] void const* collectionKey,
-            [In, MarshalAs(UnmanagedType::U4)] UINT32 collectionKeySize,
-            /*[Out, MarshalAs(UnmanagedType::Interface)]*/ IntPtr* fontFileEnumerator
-            );
-    };
 
 }}}}}
 

src/Microsoft.DotNet.Wpf/src/DirectWriteForwarder/CPP/DWriteWrapper/Factory.h

@@ -11,8 +11,6 @@
 #include "FontFace.h"
 #include "FontCollection.h"
 #include "DWriteTypeConverter.h"
-#include "IFontSourceCollection.h"
-#include "FontCollectionLoader.h"
 #include "FontFileLoader.h"
 #include "TextAnalyzer.h"
 #include "NativePointerWrapper.h"

src/Microsoft.DotNet.Wpf/src/DirectWriteForwarder/CPP/DWriteWrapper/FontCollectionLoader.cpp

@@ -18,7 +18,6 @@
 #include "DWriteWrapper\LocalizedStrings.cpp"
 #include "DWriteWrapper\NativePointerWrapper.cpp"
 
-#include "DWriteWrapper\FontCollectionLoader.cpp"
 #include "DWriteWrapper\FontFileEnumerator.cpp"
 #include "DWriteWrapper\FontFileLoader.cpp"
 #include "DWriteWrapper\FontFileStream.cpp"

src/Microsoft.DotNet.Wpf/src/DirectWriteForwarder/CPP/DWriteWrapper/FontCollectionLoader.h

@@ -0,0 +1,42 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace MS.Internal.Text.TextInterface
+{
+    /// <summary>
+    /// The font collection loader interface is used to construct a collection of fonts given a particular type of key.
+    /// The font collection loader interface is recommended to be implemented by a singleton object.
+    /// IMPORTANT: font collection loader implementations must not register themselves with DirectWrite factory
+    /// inside their constructors and must not unregister themselves in their destructors, because
+    /// registration and unregistraton operations increment and decrement the object reference count respectively.
+    /// Instead, registration and unregistration of font file loaders with DirectWrite factory should be performed
+    /// outside of the font file loader implementation as a separate step.
+    /// </summary>
+    [ComImport]
+    [Guid("cca920e4-52f0-492b-bfa8-29c72ee0a468")]
+    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    internal unsafe interface IDWriteFontCollectionLoaderMirror
+    {
+        /// <summary>
+        /// Creates a font file enumerator object that encapsulates a collection of font files.
+        /// The font system calls back to this interface to create a font collection.
+        /// </summary>
+        /// <param name="collectionKey">Font collection key that uniquely identifies the collection of font files within
+        /// the scope of the font collection loader being used.</param>
+        /// <param name="collectionKeySize">Size of the font collection key in bytes.</param>
+        /// <param name="fontFileEnumerator">Pointer to the newly created font file enumerator.</param>
+        /// <returns>
+        /// Standard HRESULT error code.
+        /// </returns>
+        [PreserveSig]
+        int CreateEnumeratorFromKey(
+            /*[In, MarshalAs(UnmanagedType.Interface)]*/ IntPtr factory,
+            [In] void* collectionKey,
+            [In, MarshalAs(UnmanagedType.U4)] uint collectionKeySize,
+            /*[Out, MarshalAs(UnmanagedType.Interface)]*/ IntPtr* fontFileEnumerator
+            );
+    };
+}

src/Microsoft.DotNet.Wpf/src/DirectWriteForwarder/CPP/DWriteWrapper/IFontSourceCollection.h

@@ -0,0 +1,82 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using MS.Internal.Text.TextInterface.Interfaces;
+
+namespace MS.Internal.Text.TextInterface
+{
+    [ClassInterface(ClassInterfaceType.None)]
+    [ComVisible(true)]
+    internal unsafe class FontCollectionLoader : IDWriteFontCollectionLoaderMirror
+    {
+        private const int S_OK = unchecked((int)0L);
+        private const int E_INVALIDARG = unchecked((int)0x80070057L);
+
+        private readonly IFontSourceCollectionFactory _fontSourceCollectionFactory;
+        private readonly FontFileLoader _fontFileLoader;
+
+        public FontCollectionLoader()
+        {
+            Debug.Fail("Assertion failed");
+        }
+
+        public FontCollectionLoader(IFontSourceCollectionFactory fontSourceCollectionFactory, FontFileLoader fontFileLoader)
+        {
+            _fontSourceCollectionFactory = fontSourceCollectionFactory;
+            _fontFileLoader = fontFileLoader;
+        }
+
+        /// <summary>
+        /// Creates a font file enumerator object that encapsulates a collection of font files.
+        /// The font system calls back to this interface to create a font collection.
+        /// </summary>
+        /// <param name="collectionKey">Font collection key that uniquely identifies the collection of font files within
+        /// the scope of the font collection loader being used.</param>
+        /// <param name="collectionKeySize">Size of the font collection key in bytes.</param>
+        /// <param name="fontFileEnumerator">Pointer to the newly created font file enumerator.</param>
+        /// <returns>
+        /// Standard HRESULT error code.
+        /// </returns>
+        [ComVisible(true)]
+        public int CreateEnumeratorFromKey(IntPtr factory, [In] void* collectionKey, [In, MarshalAs(UnmanagedType.U4)] uint collectionKeySize, IntPtr* fontFileEnumerator)
+        {
+            uint numberOfCharacters = collectionKeySize / sizeof(char);
+            if ((fontFileEnumerator == null)
+                || (collectionKeySize % sizeof(char) != 0)                        // The collectionKeySize must be divisible by sizeof(WCHAR)
+                || (numberOfCharacters <= 1)                                      // The collectionKey cannot be less than or equal 1 character as it has to contain the NULL character.
+                || (((char*)collectionKey)[numberOfCharacters - 1] != '\0'))  // The collectionKey must end with the NULL character
+            {
+                return E_INVALIDARG;
+            }
+
+            *fontFileEnumerator = IntPtr.Zero;
+
+            string uriString = new string((char*)collectionKey);
+            int hr = S_OK;
+
+            try
+            {
+                IFontSourceCollection fontSourceCollection = _fontSourceCollectionFactory.Create(uriString);
+                FontFileEnumerator fontFileEnum = new FontFileEnumerator(
+                                                          fontSourceCollection,
+                                                          _fontFileLoader,
+                                                          (Native.IDWriteFactory*)factory.ToPointer()
+                                                          );
+                IntPtr pIDWriteFontFileEnumeratorMirror = Marshal.GetComInterfaceForObject(
+                                                        fontFileEnum,
+                                                        typeof(IDWriteFontFileEnumeratorMirror));
+
+                *fontFileEnumerator = pIDWriteFontFileEnumeratorMirror;
+            }
+            catch (Exception exception)
+            {
+                hr = Marshal.GetHRForException(exception);
+            }
+
+            return hr;
+        }
+    }
+}

src/Microsoft.DotNet.Wpf/src/DirectWriteForwarder/CPP/DirectWriteForwarder.cpp

@@ -0,0 +1,16 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Collections.Generic;
+
+namespace MS.Internal.Text.TextInterface
+{
+    internal interface IFontSourceCollection : IEnumerable<IFontSource>
+    {
+    }
+
+    internal interface IFontSourceCollectionFactory
+    {
+        IFontSourceCollection Create(string uriString);
+    }
+}

src/Microsoft.DotNet.Wpf/src/PresentationCore/MS/internal/Text/TextInterface/DWriteInterfaces.cs

@@ -272,9 +272,12 @@
     <Compile Include="MS\Internal\Shaping\Substitution.cs" />
     <Compile Include="MS\Internal\Shaping\TypefaceMap.cs" />
     <Compile Include="MS\Internal\Shaping\UshortList2.cs" />
+    <Compile Include="MS\Internal\Text\TextInterface\DWriteInterfaces.cs" />
     <Compile Include="MS\Internal\Text\TextInterface\DWriteLoader.cs" />
     <Compile Include="MS\Internal\Text\TextInterface\DWriteUtil.cs" />
     <Compile Include="MS\Internal\Text\TextInterface\Factory.cs" />
+    <Compile Include="MS\Internal\Text\TextInterface\FontCollectionLoader.cs" />
+    <Compile Include="MS\Internal\Text\TextInterface\IFontSourceCollection.cs" />
     <Compile Include="MS\Internal\TextFormatting\Bidi.cs" />
     <Compile Include="MS\Internal\TextFormatting\CultureMapper.cs" />
     <Compile Include="MS\Internal\TextFormatting\DrawingState.cs" />