Update image effects

src/PicView.Avalonia/Views/EffectsView.axaml

@@ -7,7 +7,7 @@
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
 
     <StackPanel Width="500">
-        <Expander Margin="0,15,0,10">
+        <Expander IsExpanded="True" Margin="0,15,0,10">
             <Expander.Header>
                 <TextBlock
                     Classes="txt"
@@ -69,30 +69,46 @@
                     x:Name="ContrastSlider" />
 
 
-                <!--  Gamma  -->
-                <Panel Margin="0,10">
+            </StackPanel>
+
+        </Expander>
+
+        <Expander IsExpanded="True" Margin="0,15,0,10">
+            <Expander.Header>
+                <TextBlock
+                    Classes="txt"
+                    FontFamily="/Assets/Fonts/Roboto-Bold.ttf#Roboto"
+                    FontSize="14"
+                    Padding="10,5"
+                    Text="{CompiledBinding Effects}" />
+            </Expander.Header>
+            <StackPanel Margin="15,20">
+
+                <!--  Emboss  -->
+                <Panel IsEnabled="False">
                     <TextBlock
                         Classes="txt"
                         HorizontalAlignment="Left"
-                        Text="{CompiledBinding Gamma}"
+                        Text="{CompiledBinding Emboss}"
                         VerticalAlignment="Center" />
                     <TextBlock
                         Classes="txt"
                         HorizontalAlignment="Right"
-                        Text="{Binding Path=Value, ElementName=GammaSlider}"
+                        Text="{Binding Path=Value, ElementName=EmbossSlider}"
                         VerticalAlignment="Center" />
                 </Panel>
 
                 <customControls:CustomSlider
                     Height="30"
+                    IsEnabled="False"
                     IsSnapToTickEnabled="True"
                     LargeChange="5"
                     Margin="0,1,0,1"
                     Maximum="100"
                     Minimum="0"
                     SmallChange="1"
                     TickFrequency="1"
-                    x:Name="GammaSlider" />
+                    x:Name="EmbossSlider" />
 
 
             </StackPanel>

src/PicView.Avalonia/Views/EffectsView.axaml.cs

@@ -1,12 +1,109 @@
 using Avalonia.Controls;
+using Avalonia.Controls.Primitives;
+using Avalonia.Media.Imaging;
+using ImageMagick;
+using PicView.Avalonia.Navigation;
+using PicView.Avalonia.ViewModels;
 
 namespace PicView.Avalonia.Views;
 
 public partial class EffectsView : UserControl
 {
+    private Percentage _brightness = new(0);
+    private Percentage _contrast = new(0);
+
     public EffectsView()
     {
         InitializeComponent();
-        Loaded += (_, _) => { };
+        Loaded += (_, _) =>
+        {
+            BrightnessSlider.ValueChanged += async (_, e) => await BrightnessChanged(e).ConfigureAwait(false);
+            ContrastSlider.ValueChanged += async (_, e) => await ContrastChanged(e).ConfigureAwait(false);
+            EmbossSlider.ValueChanged += async (_, e) => await EmbossChanged(e).ConfigureAwait(false);
+            if (DataContext is not MainViewModel vm)
+            {
+                return;
+            }
+
+            if (!NavigationHelper.CanNavigate(vm))
+            {
+                return;
+            }
+
+            // using var magick = new ImageMagick.MagickImage(vm.FileInfo);
+            // BrightnessSlider.Value = magick.get
+
+        };
+    }
+
+    private async Task BrightnessChanged(RangeBaseValueChangedEventArgs e)
+    {
+        _brightness = new Percentage(e.NewValue);
+        if (DataContext is not MainViewModel vm)
+        {
+            return;
+        }
+
+        if (!NavigationHelper.CanNavigate(vm))
+        {
+            return;
+        }
+        await SetBrightnessContrast(vm);
+    }
+
+    private async Task ContrastChanged(RangeBaseValueChangedEventArgs e)
+    {
+        _contrast = new Percentage(e.NewValue);
+        if (DataContext is not MainViewModel vm)
+        {
+            return;
+        }
+
+        if (!NavigationHelper.CanNavigate(vm))
+        {
+            return;
+        }
+        await SetBrightnessContrast(vm);
+    }
+
+    private async Task SetBrightnessContrast(MainViewModel vm)
+    {
+        using var magick = new MagickImage();
+        await magick.ReadAsync(vm.FileInfo.FullName).ConfigureAwait(false);
+        magick.BrightnessContrast(_brightness, _contrast);
+        magick.Format = MagickFormat.WebP;
+        magick.BackgroundColor = MagickColors.Transparent;
+        magick.Settings.BackgroundColor = MagickColors.Transparent;
+        magick.Settings.FillColor = MagickColors.Transparent;
+        await using var memoryStream = new MemoryStream();
+        await magick.WriteAsync(memoryStream);
+        memoryStream.Position = 0;
+        var bitmap = new Bitmap(memoryStream);
+        vm.ImageSource = bitmap;
+    }
+
+    private async Task EmbossChanged(RangeBaseValueChangedEventArgs e)
+    {
+        if (DataContext is not MainViewModel vm)
+        {
+            return;
+        }
+
+        if (!NavigationHelper.CanNavigate(vm))
+        {
+            return;
+        }
+        using var magick = new MagickImage();
+        await magick.ReadAsync(vm.FileInfo.FullName).ConfigureAwait(false);
+        magick.Format = MagickFormat.WebP;
+        magick.BackgroundColor = MagickColors.Transparent;
+        magick.Settings.BackgroundColor = MagickColors.Transparent;
+        magick.Settings.FillColor = MagickColors.Transparent;
+        magick.Emboss(0, e.NewValue);
+        await using var memoryStream = new MemoryStream();
+        await magick.WriteAsync(memoryStream);
+        memoryStream.Position = 0;
+        var bitmap = new Bitmap(memoryStream);
+        vm.ImageSource = bitmap;
     }
 }