Этап 5

Minint.Core/Services/Impl/PaletteService.cs

@@ -5,26 +5,10 @@ namespace Minint.Core.Services.Impl;
 public sealed class PaletteService : IPaletteService
 {
     public int FindColor(MinintDocument document, RgbaColor color)
-    {
-        var palette = document.Palette;
-        for (int i = 0; i < palette.Count; i++)
-        {
-            if (palette[i] == color)
-                return i;
-        }
-        return -1;
-    }
+        => document.FindColorCached(color);
 
     public int EnsureColor(MinintDocument document, RgbaColor color)
-    {
-        int idx = FindColor(document, color);
-        if (idx >= 0)
-            return idx;
-
-        idx = document.Palette.Count;
-        document.Palette.Add(color);
-        return idx;
-    }
+        => document.EnsureColorCached(color);
 
     public void CompactPalette(MinintDocument document)
     {
@@ -32,19 +16,16 @@ public sealed class PaletteService : IPaletteService
         if (palette.Count <= 1)
             return;
 
-        // 1. Collect indices actually used across all layers
-        var usedIndices = new HashSet<int> { 0 }; // always keep transparent
+        var usedIndices = new HashSet<int> { 0 };
         foreach (var layer in document.Layers)
         {
             foreach (int idx in layer.Pixels)
                 usedIndices.Add(idx);
         }
 
-        // 2. Build new palette and old→new mapping
         var oldToNew = new int[palette.Count];
         var newPalette = new List<RgbaColor>(usedIndices.Count);
 
-        // Index 0 (transparent) stays at 0
         newPalette.Add(palette[0]);
         oldToNew[0] = 0;
 
@@ -55,23 +36,21 @@ public sealed class PaletteService : IPaletteService
                 oldToNew[i] = newPalette.Count;
                 newPalette.Add(palette[i]);
             }
-            // unused indices don't get a mapping — they'll never be looked up
         }
 
-        // 3. If nothing was removed, skip the remap
         if (newPalette.Count == palette.Count)
             return;
 
-        // 4. Replace palette
         palette.Clear();
         palette.AddRange(newPalette);
 
-        // 5. Remap all pixel arrays
         foreach (var layer in document.Layers)
         {
             var px = layer.Pixels;
             for (int i = 0; i < px.Length; i++)
                 px[i] = oldToNew[px[i]];
         }
+
+        document.InvalidatePaletteCache();
     }
 }