Only swap for non-horizonal layouts.

SixLabors · Sep 15, 2023 · 3fd85c9 · 3fd85c9
1 parent dc3e081
commit 3fd85c9
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/SixLabors.Fonts/TextLayout.cs b/src/SixLabors.Fonts/TextLayout.cs
@@ -828,6 +828,11 @@ private static void SubstituteBidiMirrors(FontMetrics fontMetrics, GlyphSubstitu
 
             // TODO: This only replaces certain glyphs. We should investigate the specification further.
             // https://www.unicode.org/reports/tr50/#vertical_alternates
+            if (collection.TextOptions.LayoutMode.IsHorizontal())
+            {
+                return;
+            }
+
             for (int i = 0; i < collection.Count; i++)
             {
                 GlyphShapingData data = collection[i];