Cleanup freetype memory after usage

Author: harry-cpp

MonoGame.Framework.Content.Pipeline/Graphics/Font/SharpFontImporter.cs

@@ -55,6 +55,9 @@ public void Import(FontDescription options, string fontName)
 
             // The height used to calculate the Y offset for each character.
             YOffsetMin = -face->size->metrics.ascender >> 6;
+
+            CheckError(FreeType.FT_Done_Face(face));
+            CheckError(FreeType.FT_Done_FreeType(library));
         }
 
         private void CheckError(int error)

MonoGame.Framework.Content.Pipeline/Utilities/FreeTypeAPI.cs

@@ -246,10 +246,18 @@ unsafe partial class FreeType
         [UnmanagedCallConv(CallConvs = [typeof(CallConvCdecl)])]
         public static partial int FT_Init_FreeType(out FT_Library* library);
 
+        [LibraryImport(Library, StringMarshalling = StringMarshalling.Utf8)]
+        [UnmanagedCallConv(CallConvs = [typeof(CallConvCdecl)])]
+        public static partial int FT_Done_FreeType(FT_Library* library);
+
         [LibraryImport(Library, StringMarshalling = StringMarshalling.Utf8)]
         [UnmanagedCallConv(CallConvs = [typeof(CallConvCdecl)])]
         public static partial int FT_New_Face(FT_Library* library, string filepathname, long face_index, out FT_Face* aface);
 
+        [LibraryImport(Library, StringMarshalling = StringMarshalling.Utf8)]
+        [UnmanagedCallConv(CallConvs = [typeof(CallConvCdecl)])]
+        public static partial int FT_Done_Face(FT_Face* aface);
+
         [LibraryImport(Library, StringMarshalling = StringMarshalling.Utf8)]
         [UnmanagedCallConv(CallConvs = [typeof(CallConvCdecl)])]
         public static partial uint FT_Get_Char_Index(FT_Face* face, ulong charcode);