Add Shell project.

src/Syroot.Worms.sln

@@ -39,6 +39,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Syroot.Worms.Mgame.GameServ
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Syroot.Worms.Mgame.Test", "test\Syroot.Worms.Mgame.Test\Syroot.Worms.Mgame.Test.csproj", "{212F8090-9775-4098-BD44-9ABC01FBE553}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Syroot.Worms.Shell", "tool\Syroot.Worms.Shell\Syroot.Worms.Shell.csproj", "{1FAB6B9F-2585-46DC-81C0-579DC808C389}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -105,6 +107,10 @@ Global
 		{212F8090-9775-4098-BD44-9ABC01FBE553}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{212F8090-9775-4098-BD44-9ABC01FBE553}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{212F8090-9775-4098-BD44-9ABC01FBE553}.Release|Any CPU.Build.0 = Release|Any CPU
+		{1FAB6B9F-2585-46DC-81C0-579DC808C389}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1FAB6B9F-2585-46DC-81C0-579DC808C389}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1FAB6B9F-2585-46DC-81C0-579DC808C389}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1FAB6B9F-2585-46DC-81C0-579DC808C389}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -125,6 +131,7 @@ Global
 		{351B93B0-301F-42E1-82A0-7FA217154F5D} = {99E56312-A064-4AD3-8443-0B56A5F76E6B}
 		{392E4CA2-61D9-4BE1-B065-8801A9F102B8} = {0B9B0B74-3EB1-46A4-BCCC-F2D6AE59A9EE}
 		{212F8090-9775-4098-BD44-9ABC01FBE553} = {99E56312-A064-4AD3-8443-0B56A5F76E6B}
+		{1FAB6B9F-2585-46DC-81C0-579DC808C389} = {0B9B0B74-3EB1-46A4-BCCC-F2D6AE59A9EE}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {1CD4EDE2-A5FB-4A58-A850-3506AB7E7B69}

src/tool/Syroot.Worms.Shell/AssemblyInfo.cs

@@ -0,0 +1,19 @@
+using System.Reflection;
+
+namespace Syroot.Worms.Shell
+{
+    internal static class AssemblyInfo
+    {
+        // ---- CONSTRUCTORS & DESTRUCTOR ------------------------------------------------------------------------------
+
+        static AssemblyInfo()
+        {
+            Assembly entryAssembly = Assembly.GetEntryAssembly();
+            Title = entryAssembly.GetCustomAttribute<AssemblyTitleAttribute>().Title;
+        }
+
+        // ---- PROPERTIES ---------------------------------------------------------------------------------------------
+
+        internal static string Title { get; }
+    }
+}

src/tool/Syroot.Worms.Shell/ImgContextMenu.cs

@@ -0,0 +1,112 @@
+using System.Collections.Generic;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Windows.Forms;
+using SharpShell.Attributes;
+using SharpShell.SharpContextMenu;
+
+namespace Syroot.Worms.Shell
+{
+    /// <summary>
+    /// Represents a context menu extension for <see cref="Image"/> files.
+    /// </summary>
+    [ComVisible(true)]
+    [COMServerAssociation(AssociationType.ClassOfExtension, ".img")]
+    internal class ImgContextMenu : SharpContextMenu
+    {
+        // ---- METHODS (PROTECTED) ------------------------------------------------------------------------------------
+
+        protected override bool CanShowMenu()
+        {
+            // At least one image must be convertible.
+            foreach (string file in SelectedItemPaths)
+            {
+                try
+                {
+                    Img img = new Img(file);
+                    return true;
+                }
+                catch { }
+            }
+            return false;
+        }
+
+        protected override ContextMenuStrip CreateMenu()
+        {
+            ToolStripMenuItem menuItem = new ToolStripMenuItem { Text = "Convert to PNG" };
+            menuItem.Click += (s, e) =>
+            {
+                // Convert all files.
+                var tasks = new List<(string file, ConversionResult result)>();
+                foreach (string file in SelectedItemPaths)
+                {
+                    (string file, ConversionResult result) task = (file, ConversionResult.Success);
+                    tasks.Add(task);
+
+                    // If the file already exists, do nothing.
+                    string newFile = Path.ChangeExtension(Path.GetFileNameWithoutExtension(file) + " {converted}", "png");
+                    if (File.Exists(newFile))
+                    {
+                        task.result = ConversionResult.FileExists;
+                        continue;
+                    }
+
+                    // Try to convert to PNG.
+                    try
+                    {
+                        Img img = new Img(file);
+                        using (Bitmap bitmap = img.ToBitmap())
+                            bitmap.Save(newFile, ImageFormat.Png);
+                    }
+                    catch
+                    {
+                        task.result = ConversionResult.InvalidImg;
+                    }
+                }
+
+                // Show failed conversion results, if any.
+                var failedTasks = tasks.Where(x => x.result != ConversionResult.Success).ToList();
+                if (failedTasks.Count > 0)
+                {
+                    StringBuilder stringBuilder = new StringBuilder("Conversion of the following files failed:");
+                    stringBuilder.AppendLine();
+                    foreach (var (file, result) in tasks)
+                        stringBuilder.AppendLine($"{file} ({GetConversionResultMessage(result)}");
+                    MessageBox.Show(stringBuilder.ToString(), AssemblyInfo.Title, MessageBoxButtons.OK,
+                        MessageBoxIcon.Warning);
+                }
+            };
+
+            ContextMenuStrip menu = new ContextMenuStrip();
+            menu.Items.Add(menuItem);
+
+            return menu;
+        }
+
+        // ---- METHODS (PRIVATE) --------------------------------------------------------------------------------------
+
+        private static string GetConversionResultMessage(ConversionResult result)
+        {
+            switch (result)
+            {
+                case ConversionResult.FileExists:
+                    return "file already exists";
+                case ConversionResult.InvalidImg:
+                    return "could not load image";
+                default:
+                    return null;
+            }
+        }
+    }
+
+    public enum ConversionResult
+    {
+        Success,
+        InvalidImg,
+        FileExists
+    }
+}

src/tool/Syroot.Worms.Shell/ImgThumbnailHandler.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Drawing;
+using System.Runtime.InteropServices;
+using SharpShell.Attributes;
+using SharpShell.SharpThumbnailHandler;
+
+namespace Syroot.Worms.Shell
+{
+    /// <summary>
+    /// Represents a thumbnail handler for <see cref="Img"/> files.
+    /// </summary>
+    [ComVisible(true)]
+    [COMServerAssociation(AssociationType.FileExtension, ".img")]
+    public class ImgThumbnailHandler : SharpThumbnailHandler
+    {
+        // ---- METHODS (PROTECTED) ------------------------------------------------------------------------------------
+
+        protected override Bitmap GetThumbnailImage(uint width)
+        {
+            try
+            {
+                Img img = new Img(SelectedItemStream);
+                using (Bitmap bitmap = img.ToBitmap())
+                {
+                    // Calculate the thumbnail size and create the image buffer to return.
+                    float scale = Math.Min(1, width / (float)bitmap.Width);
+
+                    Size thumbnailSize = new Size((int)(scale * bitmap.Width), (int)(scale * bitmap.Height));
+                    return new Bitmap(bitmap, thumbnailSize);
+                }
+            }
+            catch
+            {
+                return null;
+            }
+        }
+    }
+}

src/tool/Syroot.Worms.Shell/Install.bat

@@ -0,0 +1,2 @@
+C:\Windows\Microsoft.NET\Framework64\v4.0.30319\regasm /codebase Syroot.Worms.Shell.dll
+PAUSE

src/tool/Syroot.Worms.Shell/Syroot.Worms.Shell.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+    <AssemblyOriginatorKeyFile>Syroot.Worms.Shell.snk</AssemblyOriginatorKeyFile>
+    <SignAssembly>true</SignAssembly>
+    <TargetFramework>net472</TargetFramework>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="SharpShell" Version="2.7.1" />
+    <PackageReference Include="StrongNamer" Version="0.0.8" />
+    <ProjectReference Include="..\..\library\Syroot.Worms\Syroot.Worms.csproj" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Update="Install.bat">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Uninstall.bat">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+</Project>

src/tool/Syroot.Worms.Shell/Uninstall.bat

@@ -0,0 +1,2 @@
+C:\Windows\Microsoft.NET\Framework64\v4.0.30319\regasm /unregister Syroot.Worms.Shell.dll
+PAUSE