Adaptive annotation Thumbnail scaling

Neakita · Oct 23, 2024 · 00c1125 · 00c1125
1 parent 0b56dfd
commit 00c1125
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Showing 3 changed files with 52 additions and 8 deletions.
diff --git a/SightKeeper.Avalonia/Annotation/ScreenshotViewModel.cs b/SightKeeper.Avalonia/Annotation/ScreenshotViewModel.cs
@@ -43,7 +43,7 @@ private unsafe WriteableBitmap LoadImage()
 		return bitmap;
 	}
 
-	private unsafe WriteableBitmap LoadImage(int maximumLargestDimension)
+	internal unsafe WriteableBitmap LoadImage(int maximumLargestDimension)
 	{
 		PixelSize size = ComputeThumbnailSize(maximumLargestDimension);
 		WriteableBitmap bitmap = _bitmapPool.Rent(size, PixelFormat.Rgb32);

diff --git a/SightKeeper.Avalonia/Annotation/Screenshots.axaml b/SightKeeper.Avalonia/Annotation/Screenshots.axaml
@@ -4,6 +4,7 @@
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
              xmlns:local="clr-namespace:SightKeeper.Avalonia.Annotation"
              xmlns:behaviors="clr-namespace:SightKeeper.Avalonia.Behaviors"
+             xmlns:instance="clr-namespace:SightKeeper.Avalonia"
              mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
              x:Class="SightKeeper.Avalonia.Annotation.Screenshots"
              x:DataType="local:ScreenshotsViewModel">
@@ -18,13 +19,20 @@
         </ListBox.ItemsPanel>
         <ListBox.ItemTemplate>
             <DataTemplate>
-                <Image Name="Image"
-                       Source="{Binding Thumbnail}"
-                       Stretch="UniformToFill">
-                    <Interaction.Behaviors>
-                        <behaviors:ExecuteCommandOnSourceChanged Command="{Binding ReturnBitmapToPoolCommand}"/>
-                    </Interaction.Behaviors>
-                </Image>
+                <Decorator Name="ImageContainer">
+                    <Image Name="Image"
+                           Stretch="UniformToFill">
+                        <Interaction.Behaviors>
+                            <behaviors:ExecuteCommandOnSourceChanged Command="{Binding ReturnBitmapToPoolCommand}"/>
+                        </Interaction.Behaviors>
+                        <Image.Source>
+                            <MultiBinding Converter="{x:Static instance:ScreenshotToScaledBitmapConverter.Instance}">
+                                <Binding/>
+                                <Binding Path="#ImageContainer.Bounds.Size"/>
+                            </MultiBinding>
+                        </Image.Source>
+                    </Image>
+                </Decorator>
             </DataTemplate>
         </ListBox.ItemTemplate>
     </ListBox>

diff --git a/SightKeeper.Avalonia/ScreenshotToScaledBitmapConverter.cs b/SightKeeper.Avalonia/ScreenshotToScaledBitmapConverter.cs
@@ -0,0 +1,36 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using Avalonia;
+using Avalonia.Data.Converters;
+using SightKeeper.Avalonia.Annotation;
+
+namespace SightKeeper.Avalonia;
+
+internal sealed class ScreenshotToScaledBitmapConverter : IMultiValueConverter
+{
+	private const int SizeStep = 20;
+	private const int MinimumSize = 20;
+
+	public static ScreenshotToScaledBitmapConverter Instance { get; } = new();
+
+	public object Convert(IList<object?> values, Type targetType, object? parameter, CultureInfo culture)
+	{
+		if (values[0] is not ScreenshotViewModel screenshot ||
+		    values[1] is not Size targetSize ||
+		    targetSize.Width == 0 ||
+		    targetSize.Height == 0)
+			return AvaloniaProperty.UnsetValue;
+		var largestSizeDimension = Math.Max(targetSize.Width, targetSize.Height);
+		var roundedLargestSizeDimension = RoundSize(largestSizeDimension);
+		return screenshot.LoadImage(roundedLargestSizeDimension);
+	}
+
+	private static int RoundSize(double size)
+	{
+		var rounded = (int)Math.Round(size / SizeStep) * SizeStep;
+		if (rounded < MinimumSize)
+			return MinimumSize;
+		return rounded;
+	}
+}