Updated everything and ported to ImageSharp to be crossplatform

PDFSharp.Extensions.Sample/PDFSharp.Extensions.Sample.csproj

@@ -0,0 +1,24 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\PDFSharp.Extensions\PDFSharp.Extensions.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="res\**\*.pdf">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="res\**\*.png">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>

PDFSharp.Extensions.Sample/Program.cs

@@ -0,0 +1,103 @@
+using System;
+using SixLabors.ImageSharp;
+using System.IO;
+using System.Linq;
+using PdfSharp.Pdf;
+using PdfSharp.Pdf.Drawing;
+using PdfSharpCore.Pdf;
+using PdfSharpCore.Pdf.IO;
+
+namespace PDFSharp.Extensions.Sample
+{
+    internal static class Program
+    {
+        private static void Main(string[] args)
+        {
+            var root = args.FirstOrDefault() ?? Path.Combine("res");
+            var output = Directory.CreateDirectory("out").Name;
+            const SearchOption o = SearchOption.AllDirectories;
+            var files = Directory.GetFiles(root, "*.pdf", o);
+            foreach (var file in files)
+                try
+                {
+                    ExtractImages(output, file);
+                }
+                catch (Exception e)
+                {
+                    Console.Error.WriteLine($"{file} -> {e.Message}");
+                }
+
+            var doc = files.FirstOrDefault(f => f.Contains("sample"));
+            ExtractDocument(output, doc);
+
+            var imgs = Directory.GetFiles(root, "*.png", o);
+            CombineImages(output, imgs);
+        }
+
+        private static void CombineImages(string output, string[] filenames)
+        {
+            var images = filenames.Select(Image.Load).ToArray();
+
+            var name = Path.GetFileNameWithoutExtension(filenames.First());
+            var path = Path.Combine(output, $"{name}.pdf");
+            using (PdfDocument pdf = images.First().ToPdf())
+                pdf.Save(path);
+
+            name = Path.GetFileNameWithoutExtension(filenames.Last());
+            path = Path.Combine(output, $"{name}.pdf");
+            using (PdfDocument pdf = images.ToPdf())
+                pdf.Save(path);
+        }
+
+        private static void ExtractDocument(string output, string filename)
+        {
+            using (var document = PdfReader.Open(filename, PdfDocumentOpenMode.Import))
+            {
+                using var image = document.GetImages().Single();
+                var name = Path.GetFileNameWithoutExtension(filename);
+                var path = Path.Combine(output, $"{name}.png");
+                image.SaveAsPng(path);
+
+                var page = document.Pages[0];
+
+                var elements = page.Elements;
+                var array = elements.Values.OfType<PdfArray>().Single();
+                Console.WriteLine($" {nameof(PdfArray)} " +
+                                  $"{nameof(PdfArrayExtensions.IsEmpty)} " +
+                                  $"= {array.IsEmpty()}");
+                array.Dump();
+
+                var resources = page.Resources.Elements;
+                var dict = resources.Values.OfType<PdfDictionary>().First();
+                dict.Dump();
+            }
+        }
+
+        private static void ExtractImages(string output, string filename)
+        {
+            Console.WriteLine("Processing file: {0}", filename);
+
+            using (var document = PdfReader.Open(filename, PdfDocumentOpenMode.Import))
+            {
+                var pageIndex = 0;
+                foreach (PdfPage page in document.Pages)
+                {
+                    var imageIndex = 0;
+                    foreach (var image in page.GetImages())
+                    {
+                        var currPage = pageIndex + 1;
+                        var currImg = imageIndex + 1;
+                        Console.WriteLine("\r\nExtracting image {1} from page {0}", currPage, currImg);
+
+                        var pre = Path.GetFileNameWithoutExtension(filename);
+                        var path = string.Format(@"{2} {0:00000000}-{1:000}.png", currPage, currImg, pre);
+                        path = Path.Combine(output, path);
+                        image.SaveAsPng(path);
+                        imageIndex++;
+                    }
+                    pageIndex++;
+                }
+            }
+        }
+    }
+}

PDFSharp.Extensions.sln

@@ -1,20 +1,28 @@
-
-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 2012
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PDFSharp.Extensions", "PDFSharp.Extensions.csproj", "{35910C2C-3D6D-4912-9584-4DE66C294729}"
-EndProject
-Global
-	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|Any CPU = Debug|Any CPU
-		Release|Any CPU = Release|Any CPU
-	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{35910C2C-3D6D-4912-9584-4DE66C294729}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{35910C2C-3D6D-4912-9584-4DE66C294729}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{35910C2C-3D6D-4912-9584-4DE66C294729}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{35910C2C-3D6D-4912-9584-4DE66C294729}.Release|Any CPU.Build.0 = Release|Any CPU
-	EndGlobalSection
-	GlobalSection(SolutionProperties) = preSolution
-		HideSolutionNode = FALSE
-	EndGlobalSection
-EndGlobal
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PDFSharp.Extensions", "PDFSharp.Extensions\PDFSharp.Extensions.csproj", "{3D172E2D-785B-4CC1-BF95-CAD6AD9BDC41}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PDFSharp.Extensions.Sample", "PDFSharp.Extensions.Sample\PDFSharp.Extensions.Sample.csproj", "{FB0B4F48-BE1D-4B26-BE00-A9A21F2820D5}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{3D172E2D-785B-4CC1-BF95-CAD6AD9BDC41}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3D172E2D-785B-4CC1-BF95-CAD6AD9BDC41}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3D172E2D-785B-4CC1-BF95-CAD6AD9BDC41}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3D172E2D-785B-4CC1-BF95-CAD6AD9BDC41}.Release|Any CPU.Build.0 = Release|Any CPU
+		{FB0B4F48-BE1D-4B26-BE00-A9A21F2820D5}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FB0B4F48-BE1D-4B26-BE00-A9A21F2820D5}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FB0B4F48-BE1D-4B26-BE00-A9A21F2820D5}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FB0B4F48-BE1D-4B26-BE00-A9A21F2820D5}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

PDFSharp.Extensions/PDFSharp.Extensions.csproj

@@ -0,0 +1,29 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+
+    <RootNamespace>PDFSharp.Extensions</RootNamespace>
+    <PackageId>PdfSharpCore.Extensions</PackageId>
+    <Version>0.1.2.4</Version>
+    <Authors>Open Inventions</Authors>
+    <Company>Open Inventions</Company>
+    <LicenseUrl>https://github.com/Open-Inventions/PDFSharp.Extensions/blob/master/LICENSE</LicenseUrl>
+    <ProjectUrl>https://github.com/Open-Inventions/PDFSharp.Extensions</ProjectUrl>
+    <RepositoryUrl>https://github.com/Open-Inventions/PDFSharp.Extensions</RepositoryUrl>
+    <PackageLicenseExpression>MIT</PackageLicenseExpression>
+    <RequireLicenseAcceptance>true</RequireLicenseAcceptance>
+    <Description>Extension methods for PdfSharpCore to support and simplify some common operations including image extraction.</Description>
+    <ReleaseNotes>Initial release.</ReleaseNotes>
+    <Copyright>Copyright © 2014, George Heeres (gheeres@gmail.com) + 2022, OI</Copyright>
+    <Trademark>Licensed under MIT</Trademark>
+    <PackageTags>pdf, pdfsharp, PdfSharpCore, image, extension</PackageTags>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="BitMiracle.LibTiff.NET" Version="2.4.649" />
+    <PackageReference Include="PdfSharpCore" Version="1.3.43" />
+    <PackageReference Include="SixLabors.ImageSharp" Version="2.1.3" />
+  </ItemGroup>
+
+</Project>

Pdf/PdfArrayExtensions.cs → PDFSharp.Extensions/Pdf/PdfArrayExtensions.cs

@@ -1,4 +1,5 @@
-using System;
+using PdfSharpCore.Pdf;
+using System;
 
 // ReSharper disable once CheckNamespace
 namespace PdfSharp.Pdf