Hacking some font subsetting

binding/Binding/Definitions.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.ComponentModel;
 
 namespace SkiaSharp
@@ -427,6 +428,7 @@ namespace SkiaSharp
 			RasterDpi = rasterDpi;
 			PdfA = false;
 			EncodingQuality = DefaultEncodingQuality;
+			FontSubsetterDelegate = null;
 		}
 
 		public SKDocumentPdfMetadata (int encodingQuality)
@@ -442,6 +444,7 @@ namespace SkiaSharp
 			RasterDpi = DefaultRasterDpi;
 			PdfA = false;
 			EncodingQuality = encodingQuality;
+			FontSubsetterDelegate = null;
 		}
 
 		public SKDocumentPdfMetadata (float rasterDpi, int encodingQuality)
@@ -457,6 +460,7 @@ namespace SkiaSharp
 			RasterDpi = rasterDpi;
 			PdfA = false;
 			EncodingQuality = encodingQuality;
+			FontSubsetterDelegate = null;
 		}
 
 		public string Title { readonly get; set; }
@@ -471,6 +475,8 @@ namespace SkiaSharp
 		public bool PdfA { readonly get; set; }
 		public int EncodingQuality { readonly get; set; }
 
+		public Func<SKData, IEnumerable<int>, string, int, SKData> FontSubsetterDelegate { readonly get; set; }
+
 		public readonly bool Equals (SKDocumentPdfMetadata obj) =>
 			Title == obj.Title &&
 			Author == obj.Author &&

externals/skia

@@ -1 +1 @@
-Subproject commit 802f2cb2fcb9153c2f5e675b608e421f8b16ebe7
+Subproject commit accbcfece683958b7c884a6e497c4f6aca1e6459

tests/Tests/SKDocumentTest.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Runtime.InteropServices;
 using Xunit;
@@ -110,6 +111,45 @@ namespace SkiaSharp.Tests
 			}
 		}
 
+		[SkippableFact]
+		public void CanCreatePdfWithSubsetter()
+		{
+			var metadata = SKDocumentPdfMetadata.Default;
+			metadata.FontSubsetterDelegate = (SKData fontData, IEnumerable<int> codepoints, string fontName, int ttcIndex) =>
+			{
+				SKData data = null;
+				// do something
+				foreach (var cp in codepoints)
+				{
+					// add cp
+				}
+				// do last
+				return data;
+			};
+
+			using (var stream = new MemoryStream())
+			{
+				using (var doc = SKDocument.CreatePdf(stream, metadata))
+				{
+					Assert.NotNull(doc);
+					Assert.NotNull(doc.BeginPage(100, 100));
+
+					doc.EndPage();
+					doc.Close();
+				}
+
+				Assert.True(stream.Length > 0);
+				Assert.True(stream.Position > 0);
+
+				stream.Position = 0;
+				using (var reader = new StreamReader(stream))
+				{
+					var contents = reader.ReadToEnd();
+					Assert.Contains("/Author (SkiaSharp Team)", contents);
+				}
+			}
+		}
+
 		[SkippableFact]
 		public void ManagedStreamDisposeOrder()
 		{