From ff98ffd0f74778f0abe7b44851e1586490449589 Mon Sep 17 00:00:00 2001
From: winscripter <142818255+winscripter@users.noreply.github.com>
Date: Sat, 8 Aug 2026 18:26:07 +0400
Subject: [PATCH] Add image copy operations

---
 .../Jxl/Processing/JxlImageOperations.cs      | 43 ++++++++++++++++++-
 1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/src/ImageSharp/Formats/Jxl/Processing/JxlImageOperations.cs b/src/ImageSharp/Formats/Jxl/Processing/JxlImageOperations.cs
index f1b50596f..c62f6a403 100644
--- a/src/ImageSharp/Formats/Jxl/Processing/JxlImageOperations.cs
+++ b/src/ImageSharp/Formats/Jxl/Processing/JxlImageOperations.cs
@@ -46,6 +46,47 @@ internal static class JxlImageOperations
             return false;
         }
 
-        
+        if (!from.IsRectangleInside(rectFrom))
+        {
+            return false;
+        }
+
+        if (!to.IsRectangleInside(rectTo))
+        {
+            return false;
+        }
+
+        if (rectFrom.Width == 0)
+        {
+            return true;
+        }
+
+        for (int y = 0; y < rectFrom.Height; y++)
+        {
+            Span<T> rowFrom = from.GetRow(rectFrom, y);
+            Span<T> rowTo = to.GetRow(rectTo, y);
+            rowFrom.CopyTo(rowTo);
+        }
+
+        return true;
+    }
+
+    public static bool CopyImageTo<T>(Rectangle rectFrom, JxlImage3<T> from, Rectangle rectTo, JxlImage3<T> to)
+        where T : unmanaged
+    {
+        if (rectFrom != rectTo)
+        {
+            return false;
+        }
+
+        for (int plane = 0; plane < 3; plane++)
+        {
+            if (!CopyImageTo(rectFrom, from.Plane(plane), rectTo, to.Plane(plane)))
+            {
+                return false;
+            }
+        }
+
+        return true;
     }
 }