Этап 10

Minint.Infrastructure/Export/BmpExporter.cs

@@ -0,0 +1,80 @@
+using Minint.Core.Services;
+
+namespace Minint.Infrastructure.Export;
+
+/// <summary>
+/// Writes a 32-bit BGRA BMP (BITMAPV4HEADER) from an ARGB pixel buffer.
+/// BMP rows are bottom-up, so we flip vertically during write.
+/// </summary>
+public sealed class BmpExporter : IBmpExporter
+{
+    private const int BmpFileHeaderSize = 14;
+    private const int BitmapV4HeaderSize = 108;
+    private const int HeadersTotal = BmpFileHeaderSize + BitmapV4HeaderSize;
+
+    public void Export(Stream stream, uint[] pixels, int width, int height)
+    {
+        ArgumentNullException.ThrowIfNull(stream);
+        ArgumentNullException.ThrowIfNull(pixels);
+        if (pixels.Length != width * height)
+            throw new ArgumentException("Pixel buffer size does not match dimensions.");
+
+        int rowBytes = width * 4;
+        int imageSize = rowBytes * height;
+        int fileSize = HeadersTotal + imageSize;
+
+        using var w = new BinaryWriter(stream, System.Text.Encoding.UTF8, leaveOpen: true);
+
+        // BITMAPFILEHEADER (14 bytes)
+        w.Write((byte)'B');
+        w.Write((byte)'M');
+        w.Write(fileSize);
+        w.Write((ushort)0); // reserved1
+        w.Write((ushort)0); // reserved2
+        w.Write(HeadersTotal); // pixel data offset
+
+        // BITMAPV4HEADER (108 bytes)
+        w.Write(BitmapV4HeaderSize);
+        w.Write(width);
+        w.Write(height); // positive = bottom-up
+        w.Write((ushort)1); // planes
+        w.Write((ushort)32); // bpp
+        w.Write(3); // biCompression = BI_BITFIELDS
+        w.Write(imageSize);
+        w.Write(2835); // X pixels per meter (~72 DPI)
+        w.Write(2835); // Y pixels per meter
+        w.Write(0); // colors used
+        w.Write(0); // important colors
+
+        // Channel masks (BGRA order in file)
+        w.Write(0x00FF0000u); // red mask
+        w.Write(0x0000FF00u); // green mask
+        w.Write(0x000000FFu); // blue mask
+        w.Write(0xFF000000u); // alpha mask
+
+        // Color space type: LCS_sRGB
+        w.Write(0x73524742); // 'sRGB'
+        // CIEXYZTRIPLE endpoints (36 bytes zeroed)
+        w.Write(new byte[36]);
+        // Gamma RGB (12 bytes zeroed)
+        w.Write(new byte[12]);
+
+        // Pixel data: BMP is bottom-up, our buffer is top-down
+        for (int y = height - 1; y >= 0; y--)
+        {
+            int rowStart = y * width;
+            for (int x = 0; x < width; x++)
+            {
+                uint argb = pixels[rowStart + x];
+                byte a = (byte)(argb >> 24);
+                byte r = (byte)((argb >> 16) & 0xFF);
+                byte g = (byte)((argb >> 8) & 0xFF);
+                byte b = (byte)(argb & 0xFF);
+                w.Write(b);
+                w.Write(g);
+                w.Write(r);
+                w.Write(a);
+            }
+        }
+    }
+}

Minint.Infrastructure/Export/GifExporter.cs

@@ -0,0 +1,329 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using Minint.Core.Services;
+
+namespace Minint.Infrastructure.Export;
+
+/// <summary>
+/// Self-implemented GIF89a animated exporter.
+/// Quantizes each ARGB frame to 256 colors (including transparent) using popularity.
+/// Uses LZW compression as required by the GIF spec.
+/// </summary>
+public sealed class GifExporter : IGifExporter
+{
+    public void Export(Stream stream, IReadOnlyList<(uint[] Pixels, uint DelayMs)> frames, int width, int height)
+    {
+        ArgumentNullException.ThrowIfNull(stream);
+        if (frames.Count == 0)
+            throw new ArgumentException("At least one frame is required.");
+
+        using var w = new BinaryWriter(stream, System.Text.Encoding.UTF8, leaveOpen: true);
+
+        WriteGifHeader(w, width, height);
+        WriteNetscapeExtension(w); // infinite loop
+
+        foreach (var (pixels, delayMs) in frames)
+        {
+            var (palette, indices, transparentIndex) = Quantize(pixels, width * height);
+            int colorBits = GetColorBits(palette.Length);
+            int tableSize = 1 << colorBits;
+
+            WriteGraphicControlExtension(w, delayMs, transparentIndex);
+            WriteImageDescriptor(w, width, height, colorBits);
+            WriteColorTable(w, palette, tableSize);
+            WriteLzwImageData(w, indices, colorBits);
+        }
+
+        w.Write((byte)0x3B); // GIF trailer
+    }
+
+    private static void WriteGifHeader(BinaryWriter w, int width, int height)
+    {
+        w.Write("GIF89a"u8.ToArray());
+        w.Write((ushort)width);
+        w.Write((ushort)height);
+        // Global color table flag=0, color resolution=7, sort=0, gct size=0
+        w.Write((byte)0x70);
+        w.Write((byte)0); // background color index
+        w.Write((byte)0); // pixel aspect ratio
+    }
+
+    private static void WriteNetscapeExtension(BinaryWriter w)
+    {
+        w.Write((byte)0x21); // extension introducer
+        w.Write((byte)0xFF); // application extension
+        w.Write((byte)11); // block size
+        w.Write("NETSCAPE2.0"u8.ToArray());
+        w.Write((byte)3); // sub-block size
+        w.Write((byte)1); // sub-block ID
+        w.Write((ushort)0); // loop count: 0 = infinite
+        w.Write((byte)0); // block terminator
+    }
+
+    private static void WriteGraphicControlExtension(BinaryWriter w, uint delayMs, int transparentIndex)
+    {
+        w.Write((byte)0x21); // extension introducer
+        w.Write((byte)0xF9); // graphic control label
+        w.Write((byte)4); // block size
+        byte packed = (byte)(transparentIndex >= 0 ? 0x09 : 0x08);
+        // disposal method=2 (restore to background), no user input, transparent flag
+        w.Write(packed);
+        ushort delayCs = (ushort)(delayMs / 10); // GIF delay is in centiseconds
+        if (delayCs == 0 && delayMs > 0) delayCs = 1;
+        w.Write(delayCs);
+        w.Write((byte)(transparentIndex >= 0 ? transparentIndex : 0));
+        w.Write((byte)0); // block terminator
+    }
+
+    private static void WriteImageDescriptor(BinaryWriter w, int width, int height, int colorBits)
+    {
+        w.Write((byte)0x2C); // image separator
+        w.Write((ushort)0); // left
+        w.Write((ushort)0); // top
+        w.Write((ushort)width);
+        w.Write((ushort)height);
+        byte packed = (byte)(0x80 | (colorBits - 1)); // local color table, not interlaced
+        w.Write(packed);
+    }
+
+    private static void WriteColorTable(BinaryWriter w, byte[][] palette, int tableSize)
+    {
+        for (int i = 0; i < tableSize; i++)
+        {
+            if (i < palette.Length)
+            {
+                w.Write(palette[i][0]); // R
+                w.Write(palette[i][1]); // G
+                w.Write(palette[i][2]); // B
+            }
+            else
+            {
+                w.Write((byte)0);
+                w.Write((byte)0);
+                w.Write((byte)0);
+            }
+        }
+    }
+
+    #region LZW compression
+
+    private static void WriteLzwImageData(BinaryWriter w, byte[] indices, int colorBits)
+    {
+        int minCodeSize = Math.Max(colorBits, 2);
+        w.Write((byte)minCodeSize);
+
+        var output = new List<byte>();
+        LzwCompress(indices, minCodeSize, output);
+
+        int offset = 0;
+        while (offset < output.Count)
+        {
+            int blockLen = Math.Min(255, output.Count - offset);
+            w.Write((byte)blockLen);
+            for (int i = 0; i < blockLen; i++)
+                w.Write(output[offset + i]);
+            offset += blockLen;
+        }
+        w.Write((byte)0); // block terminator
+    }
+
+    private static void LzwCompress(byte[] indices, int minCodeSize, List<byte> output)
+    {
+        int clearCode = 1 << minCodeSize;
+        int eoiCode = clearCode + 1;
+
+        int codeSize = minCodeSize + 1;
+        int nextCode = eoiCode + 1;
+        int maxCode = (1 << codeSize) - 1;
+
+        var table = new Dictionary<(int Prefix, byte Suffix), int>();
+
+        int bitBuffer = 0;
+        int bitCount = 0;
+
+        void EmitCode(int code)
+        {
+            bitBuffer |= code << bitCount;
+            bitCount += codeSize;
+            while (bitCount >= 8)
+            {
+                output.Add((byte)(bitBuffer & 0xFF));
+                bitBuffer >>= 8;
+                bitCount -= 8;
+            }
+        }
+
+        void ResetTable()
+        {
+            table.Clear();
+            codeSize = minCodeSize + 1;
+            nextCode = eoiCode + 1;
+            maxCode = (1 << codeSize) - 1;
+        }
+
+        EmitCode(clearCode);
+        ResetTable();
+
+        if (indices.Length == 0)
+        {
+            EmitCode(eoiCode);
+            if (bitCount > 0) output.Add((byte)(bitBuffer & 0xFF));
+            return;
+        }
+
+        int prefix = indices[0];
+
+        for (int i = 1; i < indices.Length; i++)
+        {
+            byte suffix = indices[i];
+            var key = (prefix, suffix);
+
+            if (table.TryGetValue(key, out int existing))
+            {
+                prefix = existing;
+            }
+            else
+            {
+                EmitCode(prefix);
+
+                if (nextCode <= 4095)
+                {
+                    table[key] = nextCode++;
+                    if (nextCode > maxCode + 1 && codeSize < 12)
+                    {
+                        codeSize++;
+                        maxCode = (1 << codeSize) - 1;
+                    }
+                }
+                else
+                {
+                    EmitCode(clearCode);
+                    ResetTable();
+                }
+
+                prefix = suffix;
+            }
+        }
+
+        EmitCode(prefix);
+        EmitCode(eoiCode);
+        if (bitCount > 0) output.Add((byte)(bitBuffer & 0xFF));
+    }
+
+    #endregion
+
+    #region Quantization
+
+    /// <summary>
+    /// Quantizes ARGB pixels to max 256 palette entries.
+    /// Reserves index 0 for transparent if any pixel has alpha &lt; 128.
+    /// Uses popularity-based selection for opaque colors.
+    /// </summary>
+    private static (byte[][] Palette, byte[] Indices, int TransparentIndex) Quantize(uint[] argb, int count)
+    {
+        bool hasTransparency = false;
+        var colorCounts = new Dictionary<uint, int>();
+
+        for (int i = 0; i < count; i++)
+        {
+            uint px = argb[i];
+            byte a = (byte)(px >> 24);
+            if (a < 128)
+            {
+                hasTransparency = true;
+                continue;
+            }
+            uint opaque = px | 0xFF000000u;
+            colorCounts.TryGetValue(opaque, out int c);
+            colorCounts[opaque] = c + 1;
+        }
+
+        int transparentIndex = hasTransparency ? 0 : -1;
+        int maxColors = hasTransparency ? 255 : 256;
+
+        var sorted = new List<KeyValuePair<uint, int>>(colorCounts);
+        sorted.Sort((a, b) => b.Value.CompareTo(a.Value));
+        if (sorted.Count > maxColors)
+            sorted.RemoveRange(maxColors, sorted.Count - maxColors);
+
+        var palette = new List<byte[]>();
+        var colorToIndex = new Dictionary<uint, byte>();
+
+        if (hasTransparency)
+        {
+            palette.Add([0, 0, 0]); // transparent slot
+        }
+
+        foreach (var kv in sorted)
+        {
+            uint px = kv.Key;
+            byte idx = (byte)palette.Count;
+            palette.Add([
+                (byte)((px >> 16) & 0xFF),
+                (byte)((px >> 8) & 0xFF),
+                (byte)(px & 0xFF)
+            ]);
+            colorToIndex[px] = idx;
+        }
+
+        if (palette.Count == 0)
+            palette.Add([0, 0, 0]);
+
+        var indices = new byte[count];
+        for (int i = 0; i < count; i++)
+        {
+            uint px = argb[i];
+            byte a = (byte)(px >> 24);
+            if (a < 128)
+            {
+                indices[i] = (byte)(transparentIndex >= 0 ? transparentIndex : 0);
+                continue;
+            }
+
+            uint opaque = px | 0xFF000000u;
+            if (colorToIndex.TryGetValue(opaque, out byte idx))
+            {
+                indices[i] = idx;
+            }
+            else
+            {
+                indices[i] = FindClosest(opaque, palette, hasTransparency ? 1 : 0);
+            }
+        }
+
+        return (palette.ToArray(), indices, transparentIndex);
+    }
+
+    private static byte FindClosest(uint argb, List<byte[]> palette, int startIdx)
+    {
+        byte r = (byte)((argb >> 16) & 0xFF);
+        byte g = (byte)((argb >> 8) & 0xFF);
+        byte b = (byte)(argb & 0xFF);
+
+        int bestIdx = startIdx;
+        int bestDist = int.MaxValue;
+        for (int i = startIdx; i < palette.Count; i++)
+        {
+            int dr = r - palette[i][0];
+            int dg = g - palette[i][1];
+            int db = b - palette[i][2];
+            int dist = dr * dr + dg * dg + db * db;
+            if (dist < bestDist)
+            {
+                bestDist = dist;
+                bestIdx = i;
+            }
+        }
+        return (byte)bestIdx;
+    }
+
+    private static int GetColorBits(int paletteCount)
+    {
+        int bits = 2;
+        while ((1 << bits) < paletteCount) bits++;
+        return Math.Min(bits, 8);
+    }
+
+    #endregion
+}

Minint/Controls/PixelCanvas.cs

@@ -7,6 +7,8 @@ using Avalonia.Input;
 using Avalonia.Media;
 using Avalonia.Media.Imaging;
 using Avalonia.Threading;
+using Minint.Core.Models;
+using Minint.ViewModels;
 
 namespace Minint.Controls;
 
@@ -36,23 +38,30 @@ public class PixelCanvas : Control
 
     #region Events for tool interaction
 
-    /// <summary>Fires when the user presses the left mouse button at an image pixel.</summary>
     public event Action<int, int>? ToolDown;
-
-    /// <summary>Fires when the user drags with left button held at an image pixel.</summary>
     public event Action<int, int>? ToolDrag;
-
-    /// <summary>Fires when the cursor moves over the image (pixel coords, or null if outside).</summary>
     public event Action<(int X, int Y)?>? CursorPixelChanged;
-
-    /// <summary>Set by the host to provide preview mask pixels for overlay.</summary>
     public Func<List<(int X, int Y)>?>? GetPreviewMask { get; set; }
 
+    // Selection events
+    public event Action<int, int>? SelectionStart;
+    public event Action<int, int>? SelectionUpdate;
+    public event Action<int, int>? SelectionEnd;
+
+    // Paste events
+    public event Action<int, int>? PasteMoved;
+    public event Action? PasteCommitted;
+    public event Action? PasteCancelled;
+
+    /// <summary>Provides the current EditorViewModel for reading selection/paste state during render.</summary>
+    public EditorViewModel? Editor { get; set; }
+
     #endregion
 
     private readonly Viewport _viewport = new();
     private bool _isPanning;
     private bool _isDrawing;
+    private bool _isSelecting;
     private Point _panStart;
     private double _panStartOffsetX, _panStartOffsetY;
     private bool _viewportInitialized;
@@ -116,10 +125,12 @@ public class PixelCanvas : Control
         RenderOptions.SetBitmapInterpolationMode(this, BitmapInterpolationMode.None);
         context.DrawImage(bmp, srcRect, destRect);
 
-        if (ShowGrid && _viewport.Zoom >= 4)
+        if (ShowGrid)
             DrawPixelGrid(context, imgW, imgH);
 
         DrawToolPreview(context, imgW, imgH);
+        DrawSelectionOverlay(context);
+        DrawPastePreview(context);
 
         int w = imgW, h = imgH;
         Dispatcher.UIThread.Post(() => SyncScrollBars(w, h), DispatcherPriority.Render);
@@ -156,7 +167,11 @@ public class PixelCanvas : Control
 
     private void DrawPixelGrid(DrawingContext context, int imgW, int imgH)
     {
-        var pen = new Pen(new SolidColorBrush(Color.FromArgb(60, 255, 255, 255)), 1);
+        double zoom = _viewport.Zoom;
+        if (zoom < 4) return;
+
+        var pen = new Pen(Brushes.Black, 1);
+
         var clip = new Rect(0, 0, Bounds.Width, Bounds.Height);
         var imgRect = _viewport.ImageScreenRect(imgW, imgH);
         var visible = imgRect.Intersect(clip);
@@ -174,12 +189,14 @@ public class PixelCanvas : Control
             for (int px = startPx; px <= endPx; px++)
             {
                 var (sx, _) = _viewport.PixelToScreen(px, 0);
-                context.DrawLine(pen, new Point(sx, visible.Top), new Point(sx, visible.Bottom));
+                double x = Math.Floor(sx) + 0.5;
+                context.DrawLine(pen, new Point(x, visible.Top), new Point(x, visible.Bottom));
             }
             for (int py = startPy; py <= endPy; py++)
             {
                 var (_, sy) = _viewport.PixelToScreen(0, py);
-                context.DrawLine(pen, new Point(visible.Left, sy), new Point(visible.Right, sy));
+                double y = Math.Floor(sy) + 0.5;
+                context.DrawLine(pen, new Point(visible.Left, y), new Point(visible.Right, y));
             }
         }
     }
@@ -199,11 +216,9 @@ public class PixelCanvas : Control
             foreach (var (px, py) in mask)
             {
                 var (sx, sy) = _viewport.PixelToScreen(px, py);
-                var r = new Rect(sx, sy, zoom, zoom);
+                context.FillRectangle(previewBrush, new Rect(sx, sy, zoom, zoom));
-                context.FillRectangle(previewBrush, r);
             }
 
-            // Outline around the mask bounding box
             if (mask.Count > 0)
             {
                 int minX = mask[0].X, maxX = mask[0].X;
@@ -216,12 +231,63 @@ public class PixelCanvas : Control
                     if (py > maxY) maxY = py;
                 }
                 var (ox, oy) = _viewport.PixelToScreen(minX, minY);
-                var outlineRect = new Rect(ox, oy, (maxX - minX + 1) * zoom, (maxY - minY + 1) * zoom);
+                context.DrawRectangle(outlinePen, new Rect(ox, oy, (maxX - minX + 1) * zoom, (maxY - minY + 1) * zoom));
-                context.DrawRectangle(outlinePen, outlineRect);
             }
         }
     }
 
+    private void DrawSelectionOverlay(DrawingContext context)
+    {
+        var sel = Editor?.SelectionRectNormalized;
+        if (sel is null) return;
+
+        var (sx, sy, sw, sh) = sel.Value;
+        double zoom = _viewport.Zoom;
+        var (screenX, screenY) = _viewport.PixelToScreen(sx, sy);
+        var rect = new Rect(screenX, screenY, sw * zoom, sh * zoom);
+
+        var fillBrush = new SolidColorBrush(Color.FromArgb(40, 100, 150, 255));
+        context.FillRectangle(fillBrush, rect);
+
+        var borderPen = new Pen(new SolidColorBrush(Color.FromArgb(200, 100, 150, 255)), 1,
+            new DashStyle([4, 4], 0));
+        context.DrawRectangle(borderPen, rect);
+    }
+
+    private void DrawPastePreview(DrawingContext context)
+    {
+        if (Editor is null || !Editor.IsPasting || Editor.Clipboard is null)
+            return;
+
+        var pos = Editor.PastePosition!.Value;
+        var frag = Editor.Clipboard;
+        double zoom = _viewport.Zoom;
+
+        var clip = new Rect(0, 0, Bounds.Width, Bounds.Height);
+        using (context.PushClip(clip))
+        {
+            for (int fy = 0; fy < frag.Height; fy++)
+            {
+                for (int fx = 0; fx < frag.Width; fx++)
+                {
+                    var color = frag.Pixels[fy * frag.Width + fx];
+                    if (color.A == 0) continue;
+
+                    var (sx, sy) = _viewport.PixelToScreen(pos.X + fx, pos.Y + fy);
+                    byte dispA = (byte)(color.A * 180 / 255); // semi-transparent preview
+                    var brush = new SolidColorBrush(Color.FromArgb(dispA, color.R, color.G, color.B));
+                    context.FillRectangle(brush, new Rect(sx, sy, zoom, zoom));
+                }
+            }
+
+            // Border around the floating fragment
+            var (ox, oy) = _viewport.PixelToScreen(pos.X, pos.Y);
+            var borderPen = new Pen(new SolidColorBrush(Color.FromArgb(200, 255, 200, 50)), 1,
+                new DashStyle([3, 3], 0));
+            context.DrawRectangle(borderPen, new Rect(ox, oy, frag.Width * zoom, frag.Height * zoom));
+        }
+    }
+
     #endregion
 
     #region Scrollbar Sync
@@ -284,9 +350,6 @@ public class PixelCanvas : Control
         return (px, py);
     }
 
-    /// <summary>
-    /// Recalculates the pixel coordinate under the cursor after a viewport change.
-    /// </summary>
     private void RecalcCursorPixel()
     {
         if (_lastScreenPos is null) return;
@@ -341,17 +404,35 @@ public class PixelCanvas : Control
             _panStartOffsetX = _viewport.OffsetX;
             _panStartOffsetY = _viewport.OffsetY;
             e.Handled = true;
+            return;
         }
-        else if (props.IsLeftButtonPressed && !_isPanning)
+
+        if (!props.IsLeftButtonPressed || _isPanning) return;
+
+        var pixel = ScreenToPixelClamped(e.GetPosition(this));
+        if (pixel is null) return;
+
+        // Paste mode: left-click commits
+        if (Editor is not null && Editor.IsPasting)
         {
-            var pixel = ScreenToPixelClamped(e.GetPosition(this));
+            PasteCommitted?.Invoke();
-            if (pixel is not null)
+            e.Handled = true;
-            {
+            return;
-                _isDrawing = true;
-                ToolDown?.Invoke(pixel.Value.X, pixel.Value.Y);
-                e.Handled = true;
-            }
         }
+
+        // Select tool: begin rubber-band
+        if (Editor is not null && Editor.ActiveTool == ToolType.Select)
+        {
+            _isSelecting = true;
+            SelectionStart?.Invoke(pixel.Value.X, pixel.Value.Y);
+            e.Handled = true;
+            return;
+        }
+
+        // Regular drawing tools
+        _isDrawing = true;
+        ToolDown?.Invoke(pixel.Value.X, pixel.Value.Y);
+        e.Handled = true;
     }
 
     protected override void OnPointerMoved(PointerEventArgs e)
@@ -378,7 +459,24 @@ public class PixelCanvas : Control
         {
             _lastCursorPixel = pixel;
             CursorPixelChanged?.Invoke(pixel);
+        }
+
+        // Paste mode: floating fragment follows cursor
+        if (Editor is not null && Editor.IsPasting && pixel is not null)
+        {
+            PasteMoved?.Invoke(pixel.Value.X, pixel.Value.Y);
             InvalidateVisual();
+            e.Handled = true;
+            return;
+        }
+
+        // Selection rubber-band drag
+        if (_isSelecting && pixel is not null)
+        {
+            SelectionUpdate?.Invoke(pixel.Value.X, pixel.Value.Y);
+            InvalidateVisual();
+            e.Handled = true;
+            return;
         }
 
         if (_isDrawing && pixel is not null)
@@ -386,6 +484,10 @@ public class PixelCanvas : Control
             ToolDrag?.Invoke(pixel.Value.X, pixel.Value.Y);
             e.Handled = true;
         }
+        else
+        {
+            InvalidateVisual();
+        }
     }
 
     protected override void OnPointerReleased(PointerReleasedEventArgs e)
@@ -397,6 +499,15 @@ public class PixelCanvas : Control
             _isPanning = false;
             e.Handled = true;
         }
+        else if (_isSelecting && e.InitialPressMouseButton == MouseButton.Left)
+        {
+            _isSelecting = false;
+            var pixel = ScreenToPixelClamped(e.GetPosition(this));
+            if (pixel is not null)
+                SelectionEnd?.Invoke(pixel.Value.X, pixel.Value.Y);
+            InvalidateVisual();
+            e.Handled = true;
+        }
         else if (_isDrawing && e.InitialPressMouseButton == MouseButton.Left)
         {
             _isDrawing = false;
@@ -416,6 +527,33 @@ public class PixelCanvas : Control
         }
     }
 
+    protected override void OnKeyDown(KeyEventArgs e)
+    {
+        base.OnKeyDown(e);
+
+        if (e.Key == Key.Escape)
+        {
+            if (Editor is not null && Editor.IsPasting)
+            {
+                PasteCancelled?.Invoke();
+                InvalidateVisual();
+                e.Handled = true;
+            }
+            else if (Editor is not null && Editor.HasSelection)
+            {
+                Editor.ClearSelection();
+                InvalidateVisual();
+                e.Handled = true;
+            }
+        }
+        else if (e.Key == Key.Enter && Editor is not null && Editor.IsPasting)
+        {
+            PasteCommitted?.Invoke();
+            InvalidateVisual();
+            e.Handled = true;
+        }
+    }
+
     #endregion
 
     protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)

Minint/ViewModels/EditorViewModel.cs

@@ -5,6 +5,7 @@ using System.ComponentModel;
 using System.Linq;
 using Avalonia;
 using Avalonia.Media.Imaging;
+using Avalonia.Threading;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using Minint.Core.Models;
@@ -13,6 +14,11 @@ using Minint.Core.Services.Impl;
 
 namespace Minint.ViewModels;
 
+/// <summary>
+/// Palette-independent clipboard fragment: stores resolved RGBA pixels.
+/// </summary>
+public sealed record ClipboardFragment(int Width, int Height, RgbaColor[] Pixels);
+
 public partial class EditorViewModel : ViewModelBase
 {
     private readonly ICompositor _compositor = new Compositor();
@@ -66,6 +72,27 @@ public partial class EditorViewModel : ViewModelBase
 
     public RgbaColor SelectedColor => new(_previewColor.R, _previewColor.G, _previewColor.B, _previewColor.A);
 
+    // Selection state (Select tool rubber-band)
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(HasSelection))]
+    private (int X, int Y, int W, int H)? _selectionRect;
+
+    public bool HasSelection => SelectionRect is not null;
+
+    // Clipboard
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(HasClipboard))]
+    private ClipboardFragment? _clipboard;
+
+    public bool HasClipboard => Clipboard is not null;
+
+    // Paste mode
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(IsPasting))]
+    private (int X, int Y)? _pastePosition;
+
+    public bool IsPasting => PastePosition is not null;
+
     [ObservableProperty]
     [NotifyPropertyChangedFor(nameof(Title))]
     private string? _filePath;
@@ -113,10 +140,6 @@ public partial class EditorViewModel : ViewModelBase
         SyncLayersAndCanvas(doc);
     }
 
-    /// <summary>
-    /// Re-syncs the Documents observable collection after an external modification
-    /// to Container.Documents (e.g. pattern generation adding a document).
-    /// </summary>
     public void SyncAfterExternalChange() => SyncDocumentsList();
 
     private void SyncDocumentsList()
@@ -191,7 +214,7 @@ public partial class EditorViewModel : ViewModelBase
     private void RemoveDocument()
     {
         if (Container is null || ActiveDocument is null) return;
-        if (Container.Documents.Count <= 1) return; // keep at least one
+        if (Container.Documents.Count <= 1) return;
 
         var doc = ActiveDocument;
         int idx = Container.Documents.IndexOf(doc);
@@ -203,10 +226,7 @@ public partial class EditorViewModel : ViewModelBase
     }
 
     [RelayCommand]
-    private void RenameDocument()
+    private void RenameDocument() { }
-    {
-        // Triggered via UI text edit — the Name property is directly editable via TextBox
-    }
 
     [RelayCommand]
     private void MoveDocumentUp()
@@ -254,7 +274,7 @@ public partial class EditorViewModel : ViewModelBase
     private void RemoveLayer()
     {
         if (ActiveDocument is null || ActiveLayer is null) return;
-        if (ActiveDocument.Layers.Count <= 1) return; // keep at least one
+        if (ActiveDocument.Layers.Count <= 1) return;
 
         UnsubscribeLayerVisibility();
         var layer = ActiveLayer;
@@ -322,6 +342,7 @@ public partial class EditorViewModel : ViewModelBase
 
     public void OnToolDown(int px, int py)
     {
+        if (IsPlaying) return;
         if (Container is null || ActiveDocument is null || ActiveLayer is null)
             return;
 
@@ -329,6 +350,8 @@ public partial class EditorViewModel : ViewModelBase
         if (px < 0 || px >= w || py < 0 || py >= h)
             return;
 
+        if (ActiveTool == ToolType.Select) return; // handled separately
+
         switch (ActiveTool)
         {
             case ToolType.Brush:
@@ -353,7 +376,8 @@ public partial class EditorViewModel : ViewModelBase
 
     public void OnToolDrag(int px, int py)
     {
-        if (ActiveTool == ToolType.Fill) return;
+        if (IsPlaying) return;
+        if (ActiveTool is ToolType.Fill or ToolType.Select) return;
         OnToolDown(px, py);
     }
 
@@ -361,7 +385,7 @@ public partial class EditorViewModel : ViewModelBase
     {
         if (PreviewCenter is null || Container is null)
             return null;
-        if (ActiveTool == ToolType.Fill)
+        if (ActiveTool is ToolType.Fill or ToolType.Select)
             return null;
 
         var (cx, cy) = PreviewCenter.Value;
@@ -369,36 +393,163 @@ public partial class EditorViewModel : ViewModelBase
     }
 
     [RelayCommand]
-    private void SelectBrush() => ActiveTool = ToolType.Brush;
+    private void SelectBrush() { CancelPasteMode(); ActiveTool = ToolType.Brush; }
 
     [RelayCommand]
-    private void SelectEraser() => ActiveTool = ToolType.Eraser;
+    private void SelectEraser() { CancelPasteMode(); ActiveTool = ToolType.Eraser; }
 
     [RelayCommand]
-    private void SelectFill() => ActiveTool = ToolType.Fill;
+    private void SelectFill() { CancelPasteMode(); ActiveTool = ToolType.Fill; }
+
+    [RelayCommand]
+    private void SelectSelectTool() { CancelPasteMode(); ActiveTool = ToolType.Select; }
 
     #endregion
 
-    #region Fragment copy (A4)
+    #region Selection + Copy/Paste (A4)
 
-    /// <summary>
+    /// <summary>Called by PixelCanvas when selection drag starts.</summary>
-    /// Copies a rectangular fragment from <paramref name="srcDoc"/> active layer
+    public void BeginSelection(int px, int py)
-    /// to <paramref name="dstDoc"/> active layer.
-    /// </summary>
-    public void CopyFragment(
-        MinintDocument srcDoc, int srcLayerIndex,
-        int srcX, int srcY, int regionW, int regionH,
-        MinintDocument dstDoc, int dstLayerIndex,
-        int dstX, int dstY)
     {
-        if (Container is null) return;
+        if (IsPlaying) return;
-        _fragmentService.CopyFragment(
+        SelectionRect = (px, py, 0, 0);
-            srcDoc, srcLayerIndex, srcX, srcY, regionW, regionH,
+    }
-            dstDoc, dstLayerIndex, dstX, dstY,
+
-            Container.Width, Container.Height);
+    /// <summary>Called by PixelCanvas as the user drags.</summary>
+    public void UpdateSelection(int px, int py)
+    {
+        if (SelectionRect is null) return;
+        var s = SelectionRect.Value;
+        int x = Math.Min(s.X, px);
+        int y = Math.Min(s.Y, py);
+        int w = Math.Abs(px - s.X) + 1;
+        int h = Math.Abs(py - s.Y) + 1;
+        // Store normalized rect but keep original anchor in _selAnchor
+        _selectionRectNormalized = (x, y, w, h);
+    }
+
+    /// <summary>Called by PixelCanvas when mouse is released.</summary>
+    public void FinishSelection(int px, int py)
+    {
+        if (SelectionRect is null) return;
+        var s = SelectionRect.Value;
+        int x0 = Math.Min(s.X, px);
+        int y0 = Math.Min(s.Y, py);
+        int rw = Math.Abs(px - s.X) + 1;
+        int rh = Math.Abs(py - s.Y) + 1;
+        if (Container is not null)
+        {
+            x0 = Math.Max(0, x0);
+            y0 = Math.Max(0, y0);
+            rw = Math.Min(rw, Container.Width - x0);
+            rh = Math.Min(rh, Container.Height - y0);
+        }
+        if (rw <= 0 || rh <= 0)
+        {
+            SelectionRect = null;
+            _selectionRectNormalized = null;
+            return;
+        }
+        SelectionRect = (x0, y0, rw, rh);
+        _selectionRectNormalized = SelectionRect;
+    }
+
+    private (int X, int Y, int W, int H)? _selectionRectNormalized;
+
+    /// <summary>The normalized (positive W/H, clamped) selection rectangle for rendering.</summary>
+    public (int X, int Y, int W, int H)? SelectionRectNormalized => _selectionRectNormalized;
+
+    [RelayCommand]
+    private void CopySelection()
+    {
+        if (SelectionRect is null || ActiveDocument is null || ActiveLayer is null || Container is null)
+            return;
+
+        var (sx, sy, sw, sh) = SelectionRect.Value;
+        int cw = Container.Width;
+        var palette = ActiveDocument.Palette;
+        var srcPixels = ActiveLayer.Pixels;
+        var buf = new RgbaColor[sw * sh];
+
+        for (int dy = 0; dy < sh; dy++)
+        {
+            int srcRow = sy + dy;
+            for (int dx = 0; dx < sw; dx++)
+            {
+                int srcCol = sx + dx;
+                int idx = srcPixels[srcRow * cw + srcCol];
+                buf[dy * sw + dx] = idx < palette.Count ? palette[idx] : RgbaColor.Transparent;
+            }
+        }
+
+        Clipboard = new ClipboardFragment(sw, sh, buf);
+    }
+
+    [RelayCommand]
+    private void PasteClipboard()
+    {
+        if (Clipboard is null) return;
+        PastePosition = (0, 0);
+    }
+
+    public void MovePaste(int px, int py)
+    {
+        if (IsPlaying || !IsPasting) return;
+        PastePosition = (px, py);
+    }
+
+    [RelayCommand]
+    public void CommitPaste()
+    {
+        if (IsPlaying) return;
+        if (!IsPasting || Clipboard is null || ActiveDocument is null || ActiveLayer is null || Container is null)
+            return;
+
+        var (px, py) = PastePosition!.Value;
+        int cw = Container.Width, ch = Container.Height;
+        var frag = Clipboard;
+        var dstPixels = ActiveLayer.Pixels;
+
+        for (int fy = 0; fy < frag.Height; fy++)
+        {
+            int dy = py + fy;
+            if (dy < 0 || dy >= ch) continue;
+            for (int fx = 0; fx < frag.Width; fx++)
+            {
+                int dx = px + fx;
+                if (dx < 0 || dx >= cw) continue;
+                var color = frag.Pixels[fy * frag.Width + fx];
+                if (color.A == 0) continue; // skip transparent
+                int colorIdx = ActiveDocument.EnsureColorCached(color);
+                dstPixels[dy * cw + dx] = colorIdx;
+            }
+        }
+
+        PastePosition = null;
+        SelectionRect = null;
+        _selectionRectNormalized = null;
         RefreshCanvas();
     }
 
+    [RelayCommand]
+    public void CancelPaste()
+    {
+        PastePosition = null;
+    }
+
+    public void ClearSelection()
+    {
+        SelectionRect = null;
+        _selectionRectNormalized = null;
+    }
+
+    private void CancelPasteMode()
+    {
+        PastePosition = null;
+        SelectionRect = null;
+        _selectionRectNormalized = null;
+    }
+
     #endregion
 
     #region Canvas rendering
@@ -457,6 +608,125 @@ public partial class EditorViewModel : ViewModelBase
 
     #endregion
 
+    #region Animation playback
+
+    private DispatcherTimer? _animationTimer;
+    private int _animationFrameIndex;
+
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(IsNotPlaying))]
+    private bool _isPlaying;
+
+    public bool IsNotPlaying => !IsPlaying;
+
+    [RelayCommand]
+    private void PlayAnimation()
+    {
+        if (Container is null || Container.Documents.Count < 2) return;
+        if (IsPlaying) return;
+
+        IsPlaying = true;
+        _animationFrameIndex = ActiveDocument is not null
+            ? Container.Documents.IndexOf(ActiveDocument)
+            : 0;
+        if (_animationFrameIndex < 0) _animationFrameIndex = 0;
+
+        AdvanceAnimationFrame();
+    }
+
+    [RelayCommand]
+    private void StopAnimation()
+    {
+        _animationTimer?.Stop();
+        _animationTimer = null;
+        IsPlaying = false;
+    }
+
+    private void AdvanceAnimationFrame()
+    {
+        if (Container is null || !IsPlaying)
+        {
+            StopAnimation();
+            return;
+        }
+
+        var docs = Container.Documents;
+        if (docs.Count == 0)
+        {
+            StopAnimation();
+            return;
+        }
+
+        _animationFrameIndex %= docs.Count;
+        var doc = docs[_animationFrameIndex];
+
+        _suppressDocumentSync = true;
+        ActiveDocument = doc;
+        _suppressDocumentSync = false;
+        RefreshCanvasFor(doc);
+
+        uint delay = doc.FrameDelayMs;
+        if (delay < 10) delay = 10;
+
+        _animationTimer?.Stop();
+        _animationTimer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(delay) };
+        _animationTimer.Tick += (_, _) =>
+        {
+            _animationTimer?.Stop();
+            _animationFrameIndex++;
+            AdvanceAnimationFrame();
+        };
+        _animationTimer.Start();
+    }
+
+    private void RefreshCanvasFor(MinintDocument doc)
+    {
+        if (Container is null)
+        {
+            CanvasBitmap = null;
+            return;
+        }
+
+        int w = Container.Width;
+        int h = Container.Height;
+        uint[] argb = _compositor.Composite(doc, w, h);
+
+        var bmp = new WriteableBitmap(
+            new PixelSize(w, h),
+            new Vector(96, 96),
+            Avalonia.Platform.PixelFormat.Bgra8888);
+
+        using (var fb = bmp.Lock())
+        {
+            unsafe
+            {
+                var dst = new Span<uint>((void*)fb.Address, w * h);
+                for (int i = 0; i < argb.Length; i++)
+                {
+                    uint px = argb[i];
+                    byte a2 = (byte)(px >> 24);
+                    byte r2 = (byte)((px >> 16) & 0xFF);
+                    byte g2 = (byte)((px >> 8) & 0xFF);
+                    byte b2 = (byte)(px & 0xFF);
+
+                    if (a2 == 255) { dst[i] = px; }
+                    else if (a2 == 0) { dst[i] = 0; }
+                    else
+                    {
+                        r2 = (byte)(r2 * a2 / 255);
+                        g2 = (byte)(g2 * a2 / 255);
+                        b2 = (byte)(b2 * a2 / 255);
+                        dst[i] = (uint)(b2 | (g2 << 8) | (r2 << 16) | (a2 << 24));
+                    }
+                }
+            }
+        }
+
+        CanvasBitmap = bmp;
+    }
+
+    #endregion
+
     public ICompositor Compositor => _compositor;
     public IPaletteService PaletteService => _paletteService;
     public IDrawingService DrawingService => _drawingService;

Minint/ViewModels/MainWindowViewModel.cs

@@ -1,6 +1,6 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
-using System.Linq;
 using System.Threading.Tasks;
 using Avalonia.Controls;
 using Avalonia.Platform.Storage;
@@ -9,6 +9,7 @@ using CommunityToolkit.Mvvm.Input;
 using Minint.Core.Models;
 using Minint.Core.Services;
 using Minint.Core.Services.Impl;
+using Minint.Infrastructure.Export;
 using Minint.Infrastructure.Serialization;
 using Minint.Views;
 
@@ -19,12 +20,25 @@ public partial class MainWindowViewModel : ViewModelBase
     private readonly MinintSerializer _serializer = new();
     private readonly IImageEffectsService _effects = new ImageEffectsService();
     private readonly IPatternGenerator _patternGen = new PatternGenerator();
+    private readonly IBmpExporter _bmpExporter = new BmpExporter();
+    private readonly IGifExporter _gifExporter = new GifExporter();
+    private readonly ICompositor _compositor = new Compositor();
 
     private static readonly FilePickerFileType MinintFileType = new("Minint Files")
     {
         Patterns = ["*.minint"],
     };
 
+    private static readonly FilePickerFileType BmpFileType = new("BMP Image")
+    {
+        Patterns = ["*.bmp"],
+    };
+
+    private static readonly FilePickerFileType GifFileType = new("GIF Animation")
+    {
+        Patterns = ["*.gif"],
+    };
+
     [ObservableProperty]
     private EditorViewModel _editor = new();
 
@@ -153,49 +167,6 @@ public partial class MainWindowViewModel : ViewModelBase
 
     #endregion
 
-    #region Copy fragment (A4)
-
-    [RelayCommand]
-    private async Task CopyFragmentAsync()
-    {
-        if (Editor.Container is null || Owner is not Window window) return;
-
-        var docs = Editor.Container.Documents;
-        if (docs.Count == 0) return;
-
-        var dialog = new CopyFragmentDialog(docs, Editor.Container.Width, Editor.Container.Height);
-        var result = await dialog.ShowDialog<bool?>(window);
-        if (result != true) return;
-
-        if (dialog.SourceDocument is null || dialog.DestDocument is null)
-        {
-            StatusText = "Copy failed: no document selected.";
-            return;
-        }
-        if (dialog.SourceLayerIndex < 0 || dialog.DestLayerIndex < 0)
-        {
-            StatusText = "Copy failed: no layer selected.";
-            return;
-        }
-
-        try
-        {
-            Editor.CopyFragment(
-                dialog.SourceDocument, dialog.SourceLayerIndex,
-                dialog.SourceX, dialog.SourceY,
-                dialog.FragmentWidth, dialog.FragmentHeight,
-                dialog.DestDocument, dialog.DestLayerIndex,
-                dialog.DestX, dialog.DestY);
-            StatusText = $"Copied {dialog.FragmentWidth}×{dialog.FragmentHeight} fragment.";
-        }
-        catch (Exception ex)
-        {
-            StatusText = $"Copy failed: {ex.Message}";
-        }
-    }
-
-    #endregion
-
     #region Pattern generation (Б4)
 
     [RelayCommand]
@@ -229,4 +200,80 @@ public partial class MainWindowViewModel : ViewModelBase
     }
 
     #endregion
+
+    #region Export (BMP / GIF)
+
+    [RelayCommand]
+    private async Task ExportBmpAsync()
+    {
+        if (Editor.Container is null || Editor.ActiveDocument is null) return;
+        if (Owner?.StorageProvider is not { } sp) return;
+
+        var file = await sp.SaveFilePickerAsync(new FilePickerSaveOptions
+        {
+            Title = "Export document as BMP",
+            DefaultExtension = "bmp",
+            FileTypeChoices = [BmpFileType],
+            SuggestedFileName = $"{Editor.ActiveDocument.Name}.bmp",
+        });
+        if (file is null) return;
+
+        var path = file.TryGetLocalPath();
+        if (path is null) { StatusText = "Error: could not resolve file path."; return; }
+
+        try
+        {
+            int w = Editor.Container.Width, h = Editor.Container.Height;
+            uint[] argb = _compositor.Composite(Editor.ActiveDocument, w, h);
+            await using var fs = File.Create(path);
+            _bmpExporter.Export(fs, argb, w, h);
+            StatusText = $"Exported BMP: {Path.GetFileName(path)}";
+        }
+        catch (Exception ex)
+        {
+            StatusText = $"BMP export failed: {ex.Message}";
+        }
+    }
+
+    [RelayCommand]
+    private async Task ExportGifAsync()
+    {
+        if (Editor.Container is null || Editor.Container.Documents.Count == 0) return;
+        if (Owner?.StorageProvider is not { } sp) return;
+
+        var file = await sp.SaveFilePickerAsync(new FilePickerSaveOptions
+        {
+            Title = "Export animation as GIF",
+            DefaultExtension = "gif",
+            FileTypeChoices = [GifFileType],
+            SuggestedFileName = Editor.FilePath is not null
+                ? Path.GetFileNameWithoutExtension(Editor.FilePath) + ".gif"
+                : "animation.gif",
+        });
+        if (file is null) return;
+
+        var path = file.TryGetLocalPath();
+        if (path is null) { StatusText = "Error: could not resolve file path."; return; }
+
+        try
+        {
+            int w = Editor.Container.Width, h = Editor.Container.Height;
+            var frames = new List<(uint[] Pixels, uint DelayMs)>();
+            foreach (var doc in Editor.Container.Documents)
+            {
+                uint[] argb = _compositor.Composite(doc, w, h);
+                frames.Add((argb, doc.FrameDelayMs));
+            }
+
+            await using var fs = File.Create(path);
+            _gifExporter.Export(fs, frames, w, h);
+            StatusText = $"Exported GIF ({frames.Count} frames): {Path.GetFileName(path)}";
+        }
+        catch (Exception ex)
+        {
+            StatusText = $"GIF export failed: {ex.Message}";
+        }
+    }
+
+    #endregion
 }

Minint/ViewModels/ToolType.cs

@@ -4,5 +4,6 @@ public enum ToolType
 {
     Brush,
     Eraser,
-    Fill
+    Fill,
+    Select
 }

Minint/ViewModels/ToolTypeConverters.cs

@@ -13,6 +13,7 @@ public static class ToolTypeConverters
     public static readonly IValueConverter IsBrush = new ToolTypeConverter(ToolType.Brush);
     public static readonly IValueConverter IsEraser = new ToolTypeConverter(ToolType.Eraser);
     public static readonly IValueConverter IsFill = new ToolTypeConverter(ToolType.Fill);
+    public static readonly IValueConverter IsSelect = new ToolTypeConverter(ToolType.Select);
 
     private sealed class ToolTypeConverter(ToolType target) : IValueConverter
     {

Minint/Views/CopyFragmentDialog.axaml

@@ -1,51 +0,0 @@
-<Window xmlns="https://github.com/avaloniaui"
-        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        x:Class="Minint.Views.CopyFragmentDialog"
-        Title="Copy Fragment"
-        Width="380" Height="420"
-        WindowStartupLocation="CenterOwner"
-        CanResize="False"
-        SizeToContent="Height">
-    <StackPanel Margin="16" Spacing="8">
-        <TextBlock Text="Source" FontWeight="SemiBold"/>
-        <Grid ColumnDefinitions="100,*" RowDefinitions="Auto,Auto,Auto,Auto,Auto" RowSpacing="4" ColumnSpacing="8">
-            <TextBlock Grid.Row="0" Grid.Column="0" Text="Document:" VerticalAlignment="Center"/>
-            <ComboBox Grid.Row="0" Grid.Column="1" x:Name="SrcDocCombo"
-                      HorizontalAlignment="Stretch"/>
-            <TextBlock Grid.Row="1" Grid.Column="0" Text="Layer:" VerticalAlignment="Center"/>
-            <ComboBox Grid.Row="1" Grid.Column="1" x:Name="SrcLayerCombo"
-                      HorizontalAlignment="Stretch"/>
-            <TextBlock Grid.Row="2" Grid.Column="0" Text="X:" VerticalAlignment="Center"/>
-            <NumericUpDown Grid.Row="2" Grid.Column="1" x:Name="SrcX" Value="0" Minimum="0" FormatString="0"/>
-            <TextBlock Grid.Row="3" Grid.Column="0" Text="Y:" VerticalAlignment="Center"/>
-            <NumericUpDown Grid.Row="3" Grid.Column="1" x:Name="SrcY" Value="0" Minimum="0" FormatString="0"/>
-        </Grid>
-
-        <Grid ColumnDefinitions="100,*" RowDefinitions="Auto,Auto" RowSpacing="4" ColumnSpacing="8" Margin="0,4,0,0">
-            <TextBlock Grid.Row="0" Grid.Column="0" Text="Width:" VerticalAlignment="Center"/>
-            <NumericUpDown Grid.Row="0" Grid.Column="1" x:Name="RegionW" Value="16" Minimum="1" FormatString="0"/>
-            <TextBlock Grid.Row="1" Grid.Column="0" Text="Height:" VerticalAlignment="Center"/>
-            <NumericUpDown Grid.Row="1" Grid.Column="1" x:Name="RegionH" Value="16" Minimum="1" FormatString="0"/>
-        </Grid>
-
-        <Separator Margin="0,8"/>
-        <TextBlock Text="Destination" FontWeight="SemiBold"/>
-        <Grid ColumnDefinitions="100,*" RowDefinitions="Auto,Auto,Auto,Auto" RowSpacing="4" ColumnSpacing="8">
-            <TextBlock Grid.Row="0" Grid.Column="0" Text="Document:" VerticalAlignment="Center"/>
-            <ComboBox Grid.Row="0" Grid.Column="1" x:Name="DstDocCombo"
-                      HorizontalAlignment="Stretch"/>
-            <TextBlock Grid.Row="1" Grid.Column="0" Text="Layer:" VerticalAlignment="Center"/>
-            <ComboBox Grid.Row="1" Grid.Column="1" x:Name="DstLayerCombo"
-                      HorizontalAlignment="Stretch"/>
-            <TextBlock Grid.Row="2" Grid.Column="0" Text="X:" VerticalAlignment="Center"/>
-            <NumericUpDown Grid.Row="2" Grid.Column="1" x:Name="DstX" Value="0" Minimum="0" FormatString="0"/>
-            <TextBlock Grid.Row="3" Grid.Column="0" Text="Y:" VerticalAlignment="Center"/>
-            <NumericUpDown Grid.Row="3" Grid.Column="1" x:Name="DstY" Value="0" Minimum="0" FormatString="0"/>
-        </Grid>
-
-        <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" Spacing="8" Margin="0,12,0,0">
-            <Button Content="Copy" x:Name="OkButton" IsDefault="True" Padding="16,6"/>
-            <Button Content="Cancel" x:Name="CancelButton" IsCancel="True" Padding="16,6"/>
-        </StackPanel>
-    </StackPanel>
-</Window>

Minint/Views/CopyFragmentDialog.axaml.cs

@@ -1,91 +0,0 @@
-using System;
-using System.Collections.Generic;
-using Avalonia.Controls;
-using Avalonia.Interactivity;
-using Minint.Core.Models;
-
-namespace Minint.Views;
-
-public partial class CopyFragmentDialog : Window
-{
-    private readonly List<MinintDocument> _documents;
-
-    public MinintDocument? SourceDocument => SrcDocCombo.SelectedItem as MinintDocument;
-    public int SourceLayerIndex => SrcLayerCombo.SelectedIndex;
-    public int SourceX => (int)(SrcX.Value ?? 0);
-    public int SourceY => (int)(SrcY.Value ?? 0);
-    public int FragmentWidth => (int)(RegionW.Value ?? 1);
-    public int FragmentHeight => (int)(RegionH.Value ?? 1);
-    public MinintDocument? DestDocument => DstDocCombo.SelectedItem as MinintDocument;
-    public int DestLayerIndex => DstLayerCombo.SelectedIndex;
-    public int DestX => (int)(DstX.Value ?? 0);
-    public int DestY => (int)(DstY.Value ?? 0);
-
-    public CopyFragmentDialog()
-    {
-        _documents = [];
-        InitializeComponent();
-    }
-
-    public CopyFragmentDialog(List<MinintDocument> documents, int maxW, int maxH) : this()
-    {
-        _documents = documents;
-
-        SrcDocCombo.ItemsSource = documents;
-        SrcDocCombo.DisplayMemberBinding = new Avalonia.Data.Binding("Name");
-        DstDocCombo.ItemsSource = documents;
-        DstDocCombo.DisplayMemberBinding = new Avalonia.Data.Binding("Name");
-
-        SrcX.Maximum = maxW - 1;
-        SrcY.Maximum = maxH - 1;
-        DstX.Maximum = maxW - 1;
-        DstY.Maximum = maxH - 1;
-        RegionW.Maximum = maxW;
-        RegionH.Maximum = maxH;
-
-        if (documents.Count > 0)
-        {
-            SrcDocCombo.SelectedIndex = 0;
-            DstDocCombo.SelectedIndex = documents.Count > 1 ? 1 : 0;
-        }
-
-        SrcDocCombo.SelectionChanged += (_, _) => UpdateSrcLayers();
-        DstDocCombo.SelectionChanged += (_, _) => UpdateDstLayers();
-
-        UpdateSrcLayers();
-        UpdateDstLayers();
-
-        OkButton.Click += OnOkClick;
-        CancelButton.Click += OnCancelClick;
-    }
-
-    private void UpdateSrcLayers()
-    {
-        if (SrcDocCombo.SelectedItem is MinintDocument doc)
-        {
-            SrcLayerCombo.ItemsSource = doc.Layers;
-            SrcLayerCombo.DisplayMemberBinding = new Avalonia.Data.Binding("Name");
-            if (doc.Layers.Count > 0) SrcLayerCombo.SelectedIndex = 0;
-        }
-    }
-
-    private void UpdateDstLayers()
-    {
-        if (DstDocCombo.SelectedItem is MinintDocument doc)
-        {
-            DstLayerCombo.ItemsSource = doc.Layers;
-            DstLayerCombo.DisplayMemberBinding = new Avalonia.Data.Binding("Name");
-            if (doc.Layers.Count > 0) DstLayerCombo.SelectedIndex = 0;
-        }
-    }
-
-    private void OnOkClick(object? sender, RoutedEventArgs e)
-    {
-        Close(true);
-    }
-
-    private void OnCancelClick(object? sender, RoutedEventArgs e)
-    {
-        Close(false);
-    }
-}

Minint/Views/MainWindow.axaml

@@ -25,10 +25,19 @@
                 <Separator/>
                 <MenuItem Header="_Save" Command="{Binding SaveFileCommand}" HotKey="Ctrl+S"/>
                 <MenuItem Header="Save _As…" Command="{Binding SaveFileAsCommand}" HotKey="Ctrl+Shift+S"/>
+                <Separator/>
+                <MenuItem Header="Export Document as _BMP…" Command="{Binding ExportBmpCommand}"
+                          ToolTip.Tip="Export the active document as a 32-bit BMP file"/>
+                <MenuItem Header="Export All as _GIF…" Command="{Binding ExportGifCommand}"
+                          ToolTip.Tip="Export all documents as an animated GIF"/>
             </MenuItem>
             <MenuItem Header="_Edit">
-                <MenuItem Header="Copy _Fragment…" Command="{Binding CopyFragmentCommand}"
+                <MenuItem Header="_Copy" Command="{Binding Editor.CopySelectionCommand}"
-                          ToolTip.Tip="Copy a rectangular region between documents"/>
+                          HotKey="Ctrl+C"
+                          ToolTip.Tip="Copy the selected region to clipboard"/>
+                <MenuItem Header="_Paste" Command="{Binding Editor.PasteClipboardCommand}"
+                          HotKey="Ctrl+V"
+                          ToolTip.Tip="Paste clipboard fragment onto the canvas"/>
             </MenuItem>
             <MenuItem Header="_Image">
                 <MenuItem Header="Adjust _Contrast…" Command="{Binding ApplyContrastCommand}"
@@ -41,7 +50,7 @@
             </MenuItem>
             <MenuItem Header="_View">
                 <MenuItem Header="Pixel _Grid" ToggleType="CheckBox"
-                          IsChecked="{Binding Editor.ShowGrid}" HotKey="Ctrl+G"/>
+                          IsChecked="{Binding Editor.ShowGrid, Mode=TwoWay}" HotKey="Ctrl+G"/>
             </MenuItem>
         </Menu>
 
@@ -62,6 +71,10 @@
                              ToolTip.Tip="Fill tool — flood fill with selected color"
                              IsChecked="{Binding Editor.ActiveTool, Converter={x:Static vm:ToolTypeConverters.IsFill}}"
                              Command="{Binding Editor.SelectFillCommand}"/>
+                <RadioButton GroupName="Tool" Content="Select"
+                             ToolTip.Tip="Select tool — drag to select a region, then Copy/Paste"
+                             IsChecked="{Binding Editor.ActiveTool, Converter={x:Static vm:ToolTypeConverters.IsSelect}}"
+                             Command="{Binding Editor.SelectSelectToolCommand}"/>
 
                 <Separator/>
 
@@ -77,7 +90,7 @@
                 <TextBlock Text="Color:" VerticalAlignment="Center"/>
                 <ColorPicker x:Name="ToolColorPicker"
                              Color="{Binding Editor.PreviewColor, Mode=TwoWay}"
-                             IsAlphaVisible="False"
+                             IsAlphaVisible="True"
                              VerticalAlignment="Center"/>
             </StackPanel>
         </Border>
@@ -96,6 +109,31 @@
                     BorderThickness="0,0,1,0" Padding="4">
                 <DockPanel>
                     <TextBlock DockPanel.Dock="Top" Text="Documents" FontWeight="SemiBold" Margin="0,0,0,4"/>
+
+                    <!-- Animation controls -->
+                    <StackPanel DockPanel.Dock="Bottom" Orientation="Horizontal" Spacing="4" Margin="0,4,0,0">
+                        <Button Content="▶" ToolTip.Tip="Play animation"
+                                Command="{Binding Editor.PlayAnimationCommand}"
+                                IsEnabled="{Binding Editor.IsNotPlaying}" Padding="6,2"/>
+                        <Button Content="■" ToolTip.Tip="Stop animation"
+                                Command="{Binding Editor.StopAnimationCommand}"
+                                IsEnabled="{Binding Editor.IsPlaying}" Padding="6,2"/>
+                    </StackPanel>
+
+                    <!-- Frame delay -->
+                    <StackPanel DockPanel.Dock="Bottom" Orientation="Horizontal" Spacing="4" Margin="0,4,0,0">
+                        <TextBlock Text="Delay:" VerticalAlignment="Center" FontSize="12"/>
+                        <NumericUpDown Value="{Binding Editor.ActiveDocument.FrameDelayMs}"
+                                       Minimum="10" Maximum="10000" Increment="10"
+                                       FormatString="0"
+                                       Width="110" FontSize="12"
+                                       ToolTip.Tip="Frame delay in milliseconds"
+                                       VerticalAlignment="Center"
+                                       Foreground="{DynamicResource SystemControlForegroundBaseHighBrush}"/>
+                        <TextBlock Text="ms" VerticalAlignment="Center" FontSize="12"/>
+                    </StackPanel>
+
+                    <!-- Document management buttons -->
                     <StackPanel DockPanel.Dock="Bottom" Orientation="Horizontal" Spacing="2" Margin="0,4,0,0">
                         <Button Content="+" ToolTip.Tip="Add a new document (frame)"
                                 Command="{Binding Editor.AddDocumentCommand}" Padding="6,2"/>

Minint/Views/MainWindow.axaml.cs

@@ -37,9 +37,19 @@ public partial class MainWindow : Window
 
     private static void WireCanvasEvents(PixelCanvas canvas, EditorViewModel editor)
     {
+        canvas.Editor = editor;
+
         canvas.ToolDown += (px, py) => editor.OnToolDown(px, py);
         canvas.ToolDrag += (px, py) => editor.OnToolDrag(px, py);
         canvas.CursorPixelChanged += pixel => editor.PreviewCenter = pixel;
         canvas.GetPreviewMask = () => editor.GetPreviewMask();
+
+        canvas.SelectionStart += (px, py) => editor.BeginSelection(px, py);
+        canvas.SelectionUpdate += (px, py) => editor.UpdateSelection(px, py);
+        canvas.SelectionEnd += (px, py) => { editor.FinishSelection(px, py); canvas.InvalidateVisual(); };
+
+        canvas.PasteMoved += (px, py) => editor.MovePaste(px, py);
+        canvas.PasteCommitted += () => { editor.CommitPaste(); canvas.InvalidateVisual(); };
+        canvas.PasteCancelled += () => { editor.CancelPaste(); canvas.InvalidateVisual(); };
     }
 }