From a19812896742a5036979b28d7555a28e76bb6d38 Mon Sep 17 00:00:00 2001
From: Darth Affe <darthaffe@wyrez.org>
Date: Fri, 22 Mar 2024 23:45:41 +0100
Subject: [PATCH] Added example application

---
 ImageCreationUI/ActionCommand.cs              |  42 ++++
 ImageCreationUI/App.xaml                      |   4 +
 ImageCreationUI/App.xaml.cs                   |  14 ++
 .../Converter/ImageToImageSourceConverter.cs  |  33 +++
 ImageCreationUI/Extensions/ImageExtension.cs  |  45 ++++
 ImageCreationUI/ImageCreationUI.csproj        |  20 ++
 .../ImageCreationUI.csproj.DotSettings        |   2 +
 ImageCreationUI/MainWindow.xaml               |  85 +++++++
 ImageCreationUI/MainWindow.xaml.cs            |  11 +
 ImageCreationUI/MainWindowViewModel.cs        | 225 ++++++++++++++++++
 StableDiffusion.NET.sln                       |  13 +-
 11 files changed, 493 insertions(+), 1 deletion(-)
 create mode 100644 ImageCreationUI/ActionCommand.cs
 create mode 100644 ImageCreationUI/App.xaml
 create mode 100644 ImageCreationUI/App.xaml.cs
 create mode 100644 ImageCreationUI/Converter/ImageToImageSourceConverter.cs
 create mode 100644 ImageCreationUI/Extensions/ImageExtension.cs
 create mode 100644 ImageCreationUI/ImageCreationUI.csproj
 create mode 100644 ImageCreationUI/ImageCreationUI.csproj.DotSettings
 create mode 100644 ImageCreationUI/MainWindow.xaml
 create mode 100644 ImageCreationUI/MainWindow.xaml.cs
 create mode 100644 ImageCreationUI/MainWindowViewModel.cs

diff --git a/ImageCreationUI/ActionCommand.cs b/ImageCreationUI/ActionCommand.cs
new file mode 100644
index 0000000..2b87fdb
--- /dev/null
+++ b/ImageCreationUI/ActionCommand.cs
@@ -0,0 +1,42 @@
+using System.Windows.Input;
+
+namespace ImageCreationUI;
+
+public class ActionCommand(Action command, Func<bool>? canExecute = null) : ICommand
+{
+    #region Events
+
+    public event EventHandler? CanExecuteChanged;
+
+    #endregion
+
+    #region Methods
+
+    public bool CanExecute(object? parameter) => canExecute?.Invoke() ?? true;
+
+    public void Execute(object? parameter) => command.Invoke();
+
+    public void RaiseCanExecuteChanged() => CanExecuteChanged?.Invoke(this, EventArgs.Empty);
+
+    #endregion
+}
+
+public class ActionCommand<T>(Action<T> command, Func<T, bool>? canExecute = null) : ICommand
+    where T : class
+{
+    #region Events
+
+    public event EventHandler? CanExecuteChanged;
+
+    #endregion
+
+    #region Methods
+
+    public bool CanExecute(object? parameter) => canExecute?.Invoke((T)parameter!) ?? true;
+
+    public void Execute(object? parameter) => command.Invoke((T)parameter!);
+
+    public void RaiseCanExecuteChanged() => CanExecuteChanged?.Invoke(this, EventArgs.Empty);
+
+    #endregion
+}
\ No newline at end of file
diff --git a/ImageCreationUI/App.xaml b/ImageCreationUI/App.xaml
new file mode 100644
index 0000000..84ead37
--- /dev/null
+++ b/ImageCreationUI/App.xaml
@@ -0,0 +1,4 @@
+<Application x:Class="ImageCreationUI.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             StartupUri="MainWindow.xaml" />
diff --git a/ImageCreationUI/App.xaml.cs b/ImageCreationUI/App.xaml.cs
new file mode 100644
index 0000000..d92161c
--- /dev/null
+++ b/ImageCreationUI/App.xaml.cs
@@ -0,0 +1,14 @@
+using System.Configuration;
+using System.Data;
+using System.Windows;
+
+namespace ImageCreationUI
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+
+}
diff --git a/ImageCreationUI/Converter/ImageToImageSourceConverter.cs b/ImageCreationUI/Converter/ImageToImageSourceConverter.cs
new file mode 100644
index 0000000..6370177
--- /dev/null
+++ b/ImageCreationUI/Converter/ImageToImageSourceConverter.cs
@@ -0,0 +1,33 @@
+using System.Drawing;
+using System.Globalization;
+using System.IO;
+using System.Windows.Data;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using StableDiffusion.NET.Helper.Images;
+
+namespace ImageCreationUI.Converter;
+
+[ValueConversion(typeof(IImage), typeof(ImageSource))]
+public class ImageToImageSourceConverter : IValueConverter
+{
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        Bitmap? bitmap = (value as IImage)?.ToBitmap();
+        if (bitmap == null) return null;
+
+        using MemoryStream ms = new();
+        bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
+        ms.Position = 0;
+
+        BitmapImage bitmapImage = new();
+        bitmapImage.BeginInit();
+        bitmapImage.StreamSource = ms;
+        bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
+        bitmapImage.EndInit();
+
+        return bitmapImage;
+    }
+
+    public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture) => throw new NotSupportedException();
+}
\ No newline at end of file
diff --git a/ImageCreationUI/Extensions/ImageExtension.cs b/ImageCreationUI/Extensions/ImageExtension.cs
new file mode 100644
index 0000000..dbc7e3e
--- /dev/null
+++ b/ImageCreationUI/Extensions/ImageExtension.cs
@@ -0,0 +1,45 @@
+using System.Drawing;
+using System.Drawing.Imaging;
+using StableDiffusion.NET.Helper.Images.Colors;
+using StableDiffusion.NET.Helper.Images;
+using System.IO;
+
+namespace ImageCreationUI;
+
+public static class ImageExtension
+{
+    public static Bitmap ToBitmap(this IImage image) => image.AsRefImage<ColorRGB>().ToBitmap();
+    public static Bitmap ToBitmap(this Image<ColorRGB> image) => image.AsRefImage<ColorRGB>().ToBitmap();
+
+    public static unsafe Bitmap ToBitmap(this RefImage<ColorRGB> image)
+    {
+        Bitmap output = new(image.Width, image.Height, PixelFormat.Format24bppRgb);
+        Rectangle rect = new(0, 0, image.Width, image.Height);
+        BitmapData bmpData = output.LockBits(rect, ImageLockMode.ReadWrite, output.PixelFormat);
+
+        nint ptr = bmpData.Scan0;
+        foreach (ReadOnlyRefEnumerable<ColorRGB> row in image.Rows)
+        {
+            Span<ColorBGR> target = new((void*)ptr, bmpData.Stride);
+            for (int i = 0; i < row.Length; i++)
+            {
+                ColorRGB srcColor = row[i];
+                target[i] = new ColorBGR(srcColor.B, srcColor.G, srcColor.R);
+            }
+
+            ptr += bmpData.Stride;
+        }
+
+        output.UnlockBits(bmpData);
+        return output;
+    }
+
+    public static byte[] ToPng(this IImage image)
+    {
+        using Bitmap bitmap = image.ToBitmap();
+        using MemoryStream ms = new();
+        bitmap.Save(ms, ImageFormat.Png);
+
+        return ms.ToArray();
+    }
+}
\ No newline at end of file
diff --git a/ImageCreationUI/ImageCreationUI.csproj b/ImageCreationUI/ImageCreationUI.csproj
new file mode 100644
index 0000000..f5e25c8
--- /dev/null
+++ b/ImageCreationUI/ImageCreationUI.csproj
@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <UseWPF>true</UseWPF>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="System.Drawing.Common" Version="8.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\StableDiffusion.NET\StableDiffusion.NET.csproj" />
+  </ItemGroup>
+
+</Project>
diff --git a/ImageCreationUI/ImageCreationUI.csproj.DotSettings b/ImageCreationUI/ImageCreationUI.csproj.DotSettings
new file mode 100644
index 0000000..17962b1
--- /dev/null
+++ b/ImageCreationUI/ImageCreationUI.csproj.DotSettings
@@ -0,0 +1,2 @@
+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=extensions/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>
\ No newline at end of file
diff --git a/ImageCreationUI/MainWindow.xaml b/ImageCreationUI/MainWindow.xaml
new file mode 100644
index 0000000..0e85d90
--- /dev/null
+++ b/ImageCreationUI/MainWindow.xaml
@@ -0,0 +1,85 @@
+<Window x:Class="ImageCreationUI.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:ImageCreationUI"
+        xmlns:converter="clr-namespace:ImageCreationUI.Converter"
+        mc:Ignorable="d"
+        Title="StableDiffusion.NET" Width="1280" Height="720">
+    <Window.DataContext>
+        <local:MainWindowViewModel />
+    </Window.DataContext>
+
+    <Window.Resources>
+        <converter:ImageToImageSourceConverter x:Key="ImageToImageSourceConverter" />
+    </Window.Resources>
+
+    <Grid>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="400" />
+            <ColumnDefinition Width="Auto" />
+            <ColumnDefinition Width="*" />
+            <ColumnDefinition Width="Auto" />
+            <ColumnDefinition Width="400" />
+        </Grid.ColumnDefinitions>
+
+        <StackPanel Margin="4,0" Orientation="Vertical">
+            <TextBlock Margin="8" Text="This is just an example - inputs are not validated!&#10;Make sure everything is correct before pressing 'Create Image'." />
+
+            <Separator />
+
+            <Label Content="Model-Path"/>
+            <DockPanel>
+                <Button DockPanel.Dock="Right" Width="24" Margin="2,0,0,0" Content="..." Command="{Binding SelectModelCommand}" IsEnabled="{Binding IsReady}" />
+                <TextBox Text="{Binding ModelPath}" />
+            </DockPanel>
+
+            <Button Margin="0,8"  Content="Load Model" Command="{Binding LoadModelCommand}" IsEnabled="{Binding IsReady}" />
+
+            <Separator />
+
+            <Label Margin="0,8,0,0" Content="Prompt" />
+            <TextBox Height="80" TextWrapping="Wrap" Text="{Binding Prompt}" />
+
+            <Label Content="AntiPrompt" />
+            <TextBox Height="80" TextWrapping="Wrap" Text="{Binding AntiPrompt}" />
+
+            <StackPanel Orientation="Horizontal" Margin="0,8,0,0">
+                <Label Width="50" Content="Width" />
+                <TextBox HorizontalAlignment="Left" Width="60" Text="{Binding Width}" />
+            </StackPanel>
+
+            <StackPanel Orientation="Horizontal" Margin="0,8,0,0">
+                <Label Width="50" Content="Height" />
+                <TextBox HorizontalAlignment="Left" Width="60" Text="{Binding Height}" />
+            </StackPanel>
+
+            <StackPanel Orientation="Horizontal" Margin="0,8,0,0">
+                <Label Width="50" Content="Cfg" />
+                <TextBox HorizontalAlignment="Left" Width="60" Text="{Binding Cfg}" />
+            </StackPanel>
+
+            <StackPanel Orientation="Horizontal" Margin="0,8,0,0">
+                <Label Width="50" Content="Steps" />
+                <TextBox HorizontalAlignment="Left" Width="60" Text="{Binding Steps}" />
+            </StackPanel>
+
+            <StackPanel Orientation="Horizontal" Margin="0,8,0,0">
+                <Label Width="50" Content="Seed" />
+                <TextBox HorizontalAlignment="Left" Width="60" Text="{Binding Seed}" />
+            </StackPanel>
+
+            <Button Margin="0,16,0,0" Content="Create Image" Command="{Binding CreateImageCommand}" IsEnabled="{Binding IsReady}" />
+            <Button Margin="0,16,0,0" Content="Save Image" Command="{Binding SaveImageCommand}" IsEnabled="{Binding IsReady}" />
+        </StackPanel>
+
+        <GridSplitter Grid.Column="1" Margin="2,0" Width="2" Background="DimGray" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
+
+        <Image Grid.Column="2" Source="{Binding Image, Converter={StaticResource ImageToImageSourceConverter}}" />
+
+        <GridSplitter Grid.Column="3" Margin="2,0" Width="2" Background="DimGray" VerticalAlignment="Stretch" HorizontalAlignment="Center" />
+
+        <TextBox Grid.Column="4" IsReadOnly="True" BorderThickness="0" AcceptsReturn="True" Text="{Binding Log}" TextChanged="TextBoxBase_OnTextChanged" />
+    </Grid>
+</Window>
diff --git a/ImageCreationUI/MainWindow.xaml.cs b/ImageCreationUI/MainWindow.xaml.cs
new file mode 100644
index 0000000..33631a7
--- /dev/null
+++ b/ImageCreationUI/MainWindow.xaml.cs
@@ -0,0 +1,11 @@
+using System.Windows;
+using System.Windows.Controls;
+
+namespace ImageCreationUI;
+
+public partial class MainWindow : Window
+{
+    public MainWindow() => InitializeComponent();
+
+    private void TextBoxBase_OnTextChanged(object sender, TextChangedEventArgs args) => (sender as TextBox)?.ScrollToEnd();
+}
\ No newline at end of file
diff --git a/ImageCreationUI/MainWindowViewModel.cs b/ImageCreationUI/MainWindowViewModel.cs
new file mode 100644
index 0000000..d913671
--- /dev/null
+++ b/ImageCreationUI/MainWindowViewModel.cs
@@ -0,0 +1,225 @@
+using System.ComponentModel;
+using System.IO;
+using System.Runtime.CompilerServices;
+using Microsoft.Win32;
+using StableDiffusion.NET;
+using StableDiffusion.NET.Helper.Images;
+
+namespace ImageCreationUI;
+
+public class MainWindowViewModel : INotifyPropertyChanged
+{
+    #region Properties & Fields
+
+    private StableDiffusionModel? _model;
+
+    private string _modelPath = string.Empty;
+    public string ModelPath
+    {
+        get => _modelPath;
+        set => SetProperty(ref _modelPath, value);
+    }
+
+    private string _prompt = string.Empty;
+    public string Prompt
+    {
+        get => _prompt;
+        set => SetProperty(ref _prompt, value);
+    }
+
+    private string _antiPrompt = string.Empty;
+    public string AntiPrompt
+    {
+        get => _antiPrompt;
+        set => SetProperty(ref _antiPrompt, value);
+    }
+
+    private int _width = 1024;
+    public int Width
+    {
+        get => _width;
+        set => SetProperty(ref _width, value);
+    }
+
+    private int _height = 1024;
+    public int Height
+    {
+        get => _height;
+        set => SetProperty(ref _height, value);
+    }
+
+    private float _cfg = 5f;
+    public float Cfg
+    {
+        get => _cfg;
+        set => SetProperty(ref _cfg, value);
+    }
+
+    private int _steps = 28;
+    public int Steps
+    {
+        get => _steps;
+        set => SetProperty(ref _steps, value);
+    }
+
+    private int _seed = 0;
+    public int Seed
+    {
+        get => _seed;
+        set => SetProperty(ref _seed, value);
+    }
+
+    private IImage? _image;
+    public IImage? Image
+    {
+        get => _image;
+        set => SetProperty(ref _image, value);
+    }
+
+    private string _log = string.Empty;
+    public string Log
+    {
+        get => _log;
+        set => SetProperty(ref _log, value);
+    }
+
+    private bool _isReady = true;
+    public bool IsReady
+    {
+        get => _isReady;
+        set => SetProperty(ref _isReady, value);
+    }
+
+    #endregion
+
+    #region Commands
+
+    private ActionCommand? _loadModelCommand;
+    public ActionCommand LoadModelCommand => _loadModelCommand ??= new ActionCommand(LoadModel);
+
+    private ActionCommand? _createImageCommand;
+    public ActionCommand CreateImageCommand => _createImageCommand ??= new ActionCommand(CreateImage);
+
+    private ActionCommand? _saveImageCommand;
+    public ActionCommand SaveImageCommand => _saveImageCommand ??= new ActionCommand(SaveImage);
+
+    private ActionCommand? _selectModelCommand;
+    public ActionCommand SelectModelCommand => _selectModelCommand ??= new ActionCommand(SelectModel);
+
+    #endregion
+
+    #region Constructors
+
+    public MainWindowViewModel()
+    {
+        StableDiffusionModel.Log += (_, args) => LogLine($"LOG [{args.Level}]: {args.Text}", false);
+        StableDiffusionModel.Progress += (_, args) => LogLine($"PROGRESS {args.Step} / {args.Steps} ({(args.Progress * 100):N2} %) {args.IterationsPerSecond:N2} it/s ({args.Time})");
+    }
+
+    #endregion
+
+    #region Methods
+
+    private async void LoadModel()
+    {
+        try
+        {
+            IsReady = false;
+
+            _model?.Dispose();
+
+            LogLine($"Loading model '{ModelPath}'");
+            _model = await Task.Run(() => new StableDiffusionModel(ModelPath, new ModelParameter()));
+        }
+        catch (Exception ex)
+        {
+            LogLine($"Failed to load model ...{Environment.NewLine}{ex.Message}");
+        }
+        finally
+        {
+            IsReady = true;
+        }
+    }
+
+    private async void CreateImage()
+    {
+        try
+        {
+            IsReady = false;
+
+            LogLine("Creating image ...");
+            using StableDiffusionImage? image = await Task.Run(() => _model?.TextToImage(Prompt, new StableDiffusionParameter
+            {
+                NegativePrompt = AntiPrompt,
+                Width = Width,
+                Height = Height,
+                CfgScale = Cfg,
+                SampleSteps = Steps,
+                Seed = Seed
+            }));
+
+            Image = image?.ToImage();
+            LogLine("done!");
+        }
+        catch (Exception ex)
+        {
+            LogLine($"Failed to create image ...{Environment.NewLine}{ex.Message}");
+        }
+        finally
+        {
+            IsReady = true;
+        }
+    }
+
+    private void SaveImage()
+    {
+        try
+        {
+            if (Image == null) return;
+
+            SaveFileDialog saveFileDialog = new() { Filter = "PNG File (*.png)|*.png" };
+            if (saveFileDialog.ShowDialog() == true)
+            {
+                File.WriteAllBytes(saveFileDialog.FileName, Image.ToPng());
+                LogLine($"Image saved to '{saveFileDialog.FileName}'!");
+            }
+        }
+        catch (Exception ex)
+        {
+            LogLine($"Failed to save image ...{Environment.NewLine}{ex.Message}");
+        }
+    }
+
+    private void SelectModel()
+    {
+        OpenFileDialog openFileDialog = new() { Filter = "Stable Diffusion Model|*.*" };
+        if (openFileDialog.ShowDialog() == true)
+            ModelPath = openFileDialog.FileName;
+    }
+
+    private void LogLine(string line, bool appendNewLine = true)
+    {
+        if (appendNewLine)
+            Log += line + Environment.NewLine;
+        else
+            Log += line;
+    }
+
+    #endregion
+
+    #region NotifyPropertyChanged
+
+    public event PropertyChangedEventHandler? PropertyChanged;
+
+    private void OnPropertyChanged([CallerMemberName] string? propertyName = null) => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+
+    private bool SetProperty<T>(ref T field, T value, [CallerMemberName] string? propertyName = null)
+    {
+        if (EqualityComparer<T>.Default.Equals(field, value)) return false;
+        field = value;
+        OnPropertyChanged(propertyName);
+        return true;
+    }
+
+    #endregion
+}
\ No newline at end of file
diff --git a/StableDiffusion.NET.sln b/StableDiffusion.NET.sln
index 60d61a6..ac2afec 100644
--- a/StableDiffusion.NET.sln
+++ b/StableDiffusion.NET.sln
@@ -3,7 +3,11 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.8.34322.80
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StableDiffusion.NET", "StableDiffusion.NET\StableDiffusion.NET.csproj", "{ED9336F9-7C5F-47DD-A120-272F4835E95F}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "StableDiffusion.NET", "StableDiffusion.NET\StableDiffusion.NET.csproj", "{ED9336F9-7C5F-47DD-A120-272F4835E95F}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Examples", "Examples", "{8961F5D8-3F50-4027-8862-635FCA1E1568}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ImageCreationUI", "ImageCreationUI\ImageCreationUI.csproj", "{EB73E250-D2F7-469A-80BF-02C5078546A7}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -15,10 +19,17 @@ Global
 		{ED9336F9-7C5F-47DD-A120-272F4835E95F}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{ED9336F9-7C5F-47DD-A120-272F4835E95F}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{ED9336F9-7C5F-47DD-A120-272F4835E95F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{EB73E250-D2F7-469A-80BF-02C5078546A7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{EB73E250-D2F7-469A-80BF-02C5078546A7}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{EB73E250-D2F7-469A-80BF-02C5078546A7}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{EB73E250-D2F7-469A-80BF-02C5078546A7}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{EB73E250-D2F7-469A-80BF-02C5078546A7} = {8961F5D8-3F50-4027-8862-635FCA1E1568}
+	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {8DD53974-8766-4659-97B6-4AEDF4323F65}
 	EndGlobalSection