reuse Data array from X11IconLoader.cs

src/Avalonia.X11/X11IconLoader.cs

@@ -48,8 +48,8 @@ namespace Avalonia.X11
         
         public X11IconData(Bitmap bitmap)
         {
-            _width = Math.Min(bitmap.PixelSize.Width, 256);
-            _height = Math.Min(bitmap.PixelSize.Height, 256);
+            _width = Math.Min(bitmap.PixelSize.Width, 128);
+            _height = Math.Min(bitmap.PixelSize.Height, 128);
             _bdata = new uint[_width * _height];
             fixed (void* ptr = _bdata)
             {
@@ -57,12 +57,10 @@ namespace Avalonia.X11
                 iptr[0] = _width;
                 iptr[1] = _height;
             }
-            
             using(var rt = AvaloniaLocator.Current.GetService<IPlatformRenderInterface>().CreateRenderTarget(new[]{this}))
             using (var ctx = rt.CreateDrawingContext(null))
                 ctx.DrawBitmap(bitmap.PlatformImpl, 1, new Rect(bitmap.Size),
                     new Rect(0, 0, _width, _height));
-            
             Data = new UIntPtr[_width * _height + 2];
             Data[0] = new UIntPtr((uint)_width);
             Data[1] = new UIntPtr((uint)_height);
@@ -72,6 +70,8 @@ namespace Avalonia.X11
                 for (var x = 0; x < _width; x++)
                     Data[r + x] = new UIntPtr(_bdata[r + x]);
             }
+
+            _bdata = null;
         }
 
         public void Save(Stream outputStream)

src/Avalonia.X11/X11TrayIconImpl.cs

@@ -43,8 +43,8 @@ namespace Avalonia.X11
                 return new ARGB32(A, R, G, B);
             }
         }
-        
-        
+
+
         [StructLayout(LayoutKind.Explicit)]
         readonly struct ARGB32
         {
@@ -67,31 +67,30 @@ namespace Avalonia.X11
 
         public void SetIcon(IWindowIconImpl icon)
         {
-            if (icon is X11IconData x11icon)
+            if (!(icon is X11IconData x11icon)) return;
+
+            var w = (int)x11icon.Data[0];
+            var h = (int)x11icon.Data[1];
+
+            var rx = x11icon.Data.AsSpan(2);
+            var pixLength = w * h;
+            var pixelArray = new ARGB32[pixLength];
+
+            for (var i = 0; i < pixLength; i++)
             {
-                var w = (int)x11icon.Data[0];
-                var h = (int)x11icon.Data[1];
-
-                using var fb = x11icon.Lock();
-
-                var pixLength = w * h;
-                var pixelArray = new ARGB32[pixLength];
-                
-                for (var i = 0; i < pixLength; i++)
-                {
-                    var ins = new IntPtr(fb.Address.ToInt64() + i * 4);
-                    pixelArray[i] = Marshal.PtrToStructure<BGRA32>(ins).ToARGB32();
-                }
-                
-                var pixmapBytes = MemoryMarshal.Cast<ARGB32, byte>(pixelArray).ToArray();
-                
-                sni.SetIcon(new Pixmap(w, h, pixmapBytes));
+                var u = rx[i].ToUInt32();
+                var a = (byte)((u & 0xFF000000) >> 24);
+                var r = (byte)((u & 0x00FF0000) >> 16);
+                var g = (byte)((u & 0x0000FF00) >> 8);
+                var b = (byte)((u & 0x000000FF));
+                pixelArray[i] = new ARGB32(a, r, g, b);
             }
-        }
 
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private int PixCoord(int x, int y, int w) => x + (y * w);
+            var pixmapBytes = MemoryMarshal.Cast<ARGB32, byte>(pixelArray).ToArray();
 
+            sni.SetIcon(new Pixmap(w, h, pixmapBytes));
+        }
+ 
         public void SetIsVisible(bool visible)
         {
         }