Fixed RTL text not beeing rendered properly on Lib images (#9612)

Co-authored-by: Cody Robibero <cody@robibe.ro>

2 files changed, 20 insertions, 2 deletions

diff --git a/src/Jellyfin.Drawing.Skia/Jellyfin.Drawing.Skia.csproj b/src/Jellyfin.Drawing.Skia/Jellyfin.Drawing.Skia.csproj
index 3b0333299..034691322 100644
--- a/src/Jellyfin.Drawing.Skia/Jellyfin.Drawing.Skia.csproj
+++ b/src/Jellyfin.Drawing.Skia/Jellyfin.Drawing.Skia.csproj
@@ -21,6 +21,8 @@
     <PackageReference Include="SkiaSharp" />
     <PackageReference Include="SkiaSharp.NativeAssets.Linux" />
     <PackageReference Include="SkiaSharp.Svg" />
+    <PackageReference Include="SkiaSharp.HarfBuzz" />
+    <PackageReference Include="HarfBuzzSharp.NativeAssets.Linux" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Jellyfin.Drawing.Skia/StripCollageBuilder.cs b/src/Jellyfin.Drawing.Skia/StripCollageBuilder.cs
index eee24c423..a7a3338df 100644
--- a/src/Jellyfin.Drawing.Skia/StripCollageBuilder.cs
+++ b/src/Jellyfin.Drawing.Skia/StripCollageBuilder.cs
@@ -3,13 +3,14 @@ using System.Collections.Generic;
 using System.IO;
 using System.Text.RegularExpressions;
 using SkiaSharp;
+using SkiaSharp.HarfBuzz;
 
 namespace Jellyfin.Drawing.Skia;
 
 /// <summary>
 /// Used to build collages of multiple images arranged in vertical strips.
 /// </summary>
-public class StripCollageBuilder
+public partial class StripCollageBuilder
 {
     private readonly SkiaEncoder _skiaEncoder;
 
@@ -22,6 +23,9 @@ public class StripCollageBuilder
         _skiaEncoder = skiaEncoder;
     }
 
+    [GeneratedRegex(@"\p{IsArabic}|\p{IsArmenian}|\p{IsHebrew}|\p{IsSyriac}|\p{IsThaana}")]
+    private static partial Regex IsRtlTextRegex();
+
     /// <summary>
     /// Check which format an image has been encoded with using its filename extension.
     /// </summary>
@@ -144,7 +148,19 @@ public class StripCollageBuilder
             textPaint.TextSize = 0.9f * width * textPaint.TextSize / textWidth;
         }
 
-        canvas.DrawText(libraryName, width / 2f, (height / 2f) + (textPaint.FontMetrics.XHeight / 2), textPaint);
+        if (string.IsNullOrWhiteSpace(libraryName))
+        {
+            return bitmap;
+        }
+
+        if (IsRtlTextRegex().IsMatch(libraryName))
+        {
+            canvas.DrawShapedText(libraryName, width / 2f, (height / 2f) + (textPaint.FontMetrics.XHeight / 2), textPaint);
+        }
+        else
+        {
+            canvas.DrawText(libraryName, width / 2f, (height / 2f) + (textPaint.FontMetrics.XHeight / 2), textPaint);
+        }
 
         return bitmap;
     }