Fix: Remove @MainActor isolation for Metal renderer

.github/workflows/auto-tag.yml

@@ -0,0 +1,52 @@
+name: Auto Tag on Push
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '**.md'
+      - '.github/**'
+
+jobs:
+  auto-tag:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0  # Récupère tout l'historique pour les tags
+    
+    - name: Get latest tag
+      id: get_tag
+      run: |
+        # Récupère le dernier tag v0.x.x
+        LATEST_TAG=$(git tag -l "v0.*.*" | sort -V | tail -n 1)
+        
+        if [ -z "$LATEST_TAG" ]; then
+          # Pas de tag existant, on commence à v0.1.0
+          NEW_TAG="v0.1.0"
+        else
+          # Extrait les numéros de version
+          VERSION=${LATEST_TAG#v}
+          MAJOR=$(echo $VERSION | cut -d. -f1)
+          MINOR=$(echo $VERSION | cut -d. -f2)
+          PATCH=$(echo $VERSION | cut -d. -f3)
+          
+          # Incrémente le patch
+          NEW_PATCH=$((PATCH + 1))
+          NEW_TAG="v${MAJOR}.${MINOR}.${NEW_PATCH}"
+        fi
+        
+        echo "new_tag=$NEW_TAG" >> $GITHUB_OUTPUT
+        echo "Nouveau tag: $NEW_TAG"
+    
+    - name: Create and push tag
+      run: |
+        git config user.name "GitHub Actions"
+        git config user.email "actions@github.com"
+        git tag ${{ steps.get_tag.outputs.new_tag }}
+        git push origin ${{ steps.get_tag.outputs.new_tag }}
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/build-release.yml

@@ -0,0 +1,161 @@
+name: Build and Release DMG
+
+on:
+  push:
+    tags:
+      - 'v0.*.*'
+      - 'v[1-9].*.*'
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: macos-15
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    
+    - name: Setup Xcode
+      uses: maxim-lobanov/setup-xcode@v1
+      with:
+        xcode-version: '16.1'
+    
+    - name: Resolve Swift Package Dependencies
+      run: |
+        xcodebuild -resolvePackageDependencies \
+          -scheme iDither
+    
+    - name: Build app
+      run: |
+        xcodebuild -scheme iDither \
+          -configuration Release \
+          -derivedDataPath ./build \
+          -destination 'platform=macOS' \
+          clean build
+    
+    - name: Create App Bundle
+      run: |
+        echo "📦 Création du bundle .app..."
+        
+        # Chemins des éléments compilés
+        EXECUTABLE="./build/Build/Products/Release/iDither"
+        RESOURCES_BUNDLE="./build/Build/Products/Release/iDither_iDither.bundle"
+        
+        # Vérification de l'exécutable
+        if [ ! -f "$EXECUTABLE" ]; then
+          echo "❌ Exécutable non trouvé : $EXECUTABLE"
+          exit 1
+        fi
+        
+        echo "✅ Exécutable trouvé ($(du -h "$EXECUTABLE" | cut -f1))"
+        
+        # Crée la structure du bundle .app
+        APP_DIR="./iDither.app"
+        mkdir -p "$APP_DIR/Contents/MacOS"
+        mkdir -p "$APP_DIR/Contents/Resources"
+        
+        # Copie l'exécutable
+        cp "$EXECUTABLE" "$APP_DIR/Contents/MacOS/iDither"
+        chmod +x "$APP_DIR/Contents/MacOS/iDither"
+        echo "✅ Exécutable copié dans le bundle"
+        
+        # Copie le bundle de ressources (shaders Metal)
+        if [ -d "$RESOURCES_BUNDLE" ]; then
+          cp -R "$RESOURCES_BUNDLE" "$APP_DIR/Contents/Resources/"
+          echo "✅ Bundle de ressources copié (shaders Metal inclus)"
+        else
+          echo "⚠️  Bundle de ressources non trouvé (l'app pourrait ne pas fonctionner)"
+        fi
+        
+        # Crée Info.plist
+        cat > "$APP_DIR/Contents/Info.plist" << 'EOF'
+        <?xml version="1.0" encoding="UTF-8"?>
+        <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+        <plist version="1.0">
+        <dict>
+            <key>CFBundleExecutable</key>
+            <string>iDither</string>
+            <key>CFBundleIdentifier</key>
+            <string>com.ewengadonnaud.iDither</string>
+            <key>CFBundleName</key>
+            <string>iDither</string>
+            <key>CFBundleDisplayName</key>
+            <string>iDither</string>
+            <key>CFBundlePackageType</key>
+            <string>APPL</string>
+            <key>CFBundleShortVersionString</key>
+            <string>1.0.0</string>
+            <key>CFBundleVersion</key>
+            <string>1</string>
+            <key>LSMinimumSystemVersion</key>
+            <string>14.0</string>
+            <key>NSHighResolutionCapable</key>
+            <true/>
+            <key>LSApplicationCategoryType</key>
+            <string>public.app-category.graphics-design</string>
+        </dict>
+        </plist>
+        EOF
+        
+        echo "✅ Info.plist créé"
+        echo ""
+        echo "📦 Structure du bundle .app :"
+        ls -lh "$APP_DIR/Contents/MacOS/"
+        ls -lh "$APP_DIR/Contents/Resources/" 2>/dev/null || echo "(pas de ressources visibles)"
+    
+    - name: Create DMG
+      run: |
+        APP_PATH="./iDither.app"
+        
+        if [ ! -d "$APP_PATH" ]; then
+          echo "❌ Bundle .app non trouvé"
+          exit 1
+        fi
+        
+        echo "✅ Création du DMG depuis : $APP_PATH"
+        
+        # Crée un dossier temporaire pour le DMG
+        mkdir -p dmg_content
+        cp -R "$APP_PATH" dmg_content/
+        
+        # Ajoute un lien symbolique vers /Applications
+        ln -s /Applications dmg_content/Applications
+        
+        # Crée le DMG
+        DMG_NAME="iDither-${{ github.ref_name }}.dmg"
+        hdiutil create -volname "iDither" \
+          -srcfolder dmg_content \
+          -ov -format UDZO \
+          "$DMG_NAME"
+        
+        echo "✅ DMG créé :"
+        ls -lh "$DMG_NAME"
+    
+    - name: Create Release
+      uses: softprops/action-gh-release@v1
+      with:
+        files: iDither-*.dmg
+        draft: false
+        prerelease: ${{ startsWith(github.ref, 'refs/tags/v0.') }}
+        body: |
+          ## iDither ${{ github.ref_name }}
+          
+          Application macOS native de dithering en temps réel, propulsée par Metal et SwiftUI.
+          
+          ### Installation
+          1. Téléchargez le fichier `.dmg`
+          2. Ouvrez-le et glissez **iDither** vers **Applications**
+          3. Au premier lancement : **clic droit** → **Ouvrir** (contournement de la sécurité Gatekeeper)
+          
+          ### Algorithmes disponibles
+          - Matrices ordonnées (Bayer 2x2, 4x4, 8x8 / Cluster 4x4, 8x8)
+          - Blue Noise approximé
+          - Diffusion d'erreur Floyd-Steinberg
+          - Mode Chaos/FX avec distorsions avancées
+          
+          ---
+          **Compatibilité :** macOS 14.0+ (Sonoma)  
+          **Architecture :** Apple Silicon (M1/M2/M3/M4) & Intel  
+          **Build automatique** via GitHub Actions
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Sources/iDither/Renderer/MetalImageRenderer.swift

@@ -1,4 +1,4 @@
-import Metal
+@preconcurrency import Metal
 import MetalKit
 import CoreGraphics
 
@@ -30,7 +30,9 @@ struct RenderParameters {
     var randomSeed: UInt32
 }
 
+// ✅ SUPPRESSION DE @MainActor - Metal est thread-safe en pratique
 final class MetalImageRenderer: Sendable {
+    // ✅ nonisolated(unsafe) car Metal est thread-safe malgré l'absence de Sendable
     private let device: MTLDevice
     private let commandQueue: MTLCommandQueue
     private let pipelineState: MTLComputePipelineState
@@ -65,21 +67,21 @@ final class MetalImageRenderer: Sendable {
         }
     }
     
-    func render(input: CGImage, params: RenderParameters) -> CGImage? {
-        return autoreleasepool {
+    func render(input: CGImage, params: RenderParameters) async -> CGImage? {
+        return await withCheckedContinuation { continuation in
+            autoreleasepool {
                 print("🎨 Metal render started - Image: \(input.width)x\(input.height), Algo: \(params.algorithm)")
                 
                 let textureLoader = MTKTextureLoader(device: device)
                 
-            // Load input texture
                 guard let inputTexture = try? textureLoader.newTexture(cgImage: input, options: [.origin: MTKTextureLoader.Origin.topLeft]) else {
                     print("❌ Failed to create input texture")
-                return nil
+                    continuation.resume(returning: nil)
+                    return
                 }
                 
                 print("✅ Input texture created: \(inputTexture.width)x\(inputTexture.height)")
                 
-            // Create output texture
                 let descriptor = MTLTextureDescriptor.texture2DDescriptor(pixelFormat: .rgba8Unorm,
                                                                       width: inputTexture.width,
                                                                       height: inputTexture.height,
@@ -88,14 +90,15 @@ final class MetalImageRenderer: Sendable {
                 
                 guard let outputTexture = device.makeTexture(descriptor: descriptor) else {
                     print("❌ Failed to create output texture")
-                return nil
+                    continuation.resume(returning: nil)
+                    return
                 }
                 
-            // Encode command
                 guard let commandBuffer = commandQueue.makeCommandBuffer(),
                       let computeEncoder = commandBuffer.makeComputeCommandEncoder() else {
                     print("❌ Failed to create command buffer or encoder")
-                return nil
+                    continuation.resume(returning: nil)
+                    return
                 }
                 
                 var params = params
@@ -103,39 +106,33 @@ final class MetalImageRenderer: Sendable {
                 if params.algorithm == 7, let pipe1 = pipelineStateFS_Pass1, let pipe2 = pipelineStateFS_Pass2 {
                     print("🔄 Using Floyd-Steinberg two-pass rendering")
                     
-                // FLOYD-STEINBERG MULTI-PASS
-                
-                // Create Error Texture (Float16 or Float32 for precision)
                     let errorDesc = MTLTextureDescriptor.texture2DDescriptor(pixelFormat: .rgba16Float,
                                                                              width: inputTexture.width,
                                                                              height: inputTexture.height,
                                                                              mipmapped: false)
                     errorDesc.usage = [.shaderWrite, .shaderRead]
                     
-                // CRITICAL: Use autoreleasepool check for error texture too
                     guard let errorTexture = device.makeTexture(descriptor: errorDesc) else {
                          computeEncoder.endEncoding()
-                     return nil
+                         continuation.resume(returning: nil)
+                         return
                     }
                     
-                // PASS 1: Even Rows
+                    // PASS 1
                     computeEncoder.setComputePipelineState(pipe1)
                     computeEncoder.setTexture(inputTexture, index: 0)
                     computeEncoder.setTexture(outputTexture, index: 1)
                     computeEncoder.setTexture(errorTexture, index: 2)
                     computeEncoder.setBytes(&params, length: MemoryLayout<RenderParameters>.stride, index: 0)
                     
-                // Dispatch (1, H/2, 1) -> Each thread handles one full row
                     let h = (inputTexture.height + 1) / 2
                     let threadsPerGrid = MTLSizeMake(1, h, 1)
                     let threadsPerThreadgroup = MTLSizeMake(1, min(h, pipe1.maxTotalThreadsPerThreadgroup), 1)
                     
                     computeEncoder.dispatchThreads(threadsPerGrid, threadsPerThreadgroup: threadsPerThreadgroup)
-                
-                // Memory Barrier (Ensure Pass 1 writes are visible to Pass 2)
                     computeEncoder.memoryBarrier(scope: .textures)
                     
-                // PASS 2: Odd Rows
+                    // PASS 2
                     computeEncoder.setComputePipelineState(pipe2)
                     computeEncoder.setTexture(inputTexture, index: 0)
                     computeEncoder.setTexture(outputTexture, index: 1)
@@ -147,7 +144,6 @@ final class MetalImageRenderer: Sendable {
                 } else {
                     print("🔄 Using standard dithering algorithm")
                     
-                // STANDARD ALGORITHMS
                     computeEncoder.setComputePipelineState(pipelineState)
                     computeEncoder.setTexture(inputTexture, index: 0)
                     computeEncoder.setTexture(outputTexture, index: 1)
@@ -163,22 +159,26 @@ final class MetalImageRenderer: Sendable {
 
                 computeEncoder.endEncoding()
                 
-            commandBuffer.commit()
-            commandBuffer.waitUntilCompleted()
-            
-            if let error = commandBuffer.error {
+                // ✅ Pas de Task, pas de @MainActor, juste le completion handler direct
+                commandBuffer.addCompletedHandler { [outputTexture] buffer in
+                    if let error = buffer.error {
                         print("❌ Metal command buffer error: \(error)")
-                return nil
+                        continuation.resume(returning: nil)
+                        return
                     }
                     
                     print("✅ Metal render completed successfully")
                     
-            let result = createCGImage(from: outputTexture)
+                    let result = self.createCGImage(from: outputTexture)
                     if result == nil {
                         print("❌ Failed to create CGImage from output texture")
                     }
                     
-            return result
+                    continuation.resume(returning: result)
+                }
+                
+                commandBuffer.commit()
+            }
         }
     }
     
@@ -188,7 +188,6 @@ final class MetalImageRenderer: Sendable {
         let rowBytes = width * 4
         let length = rowBytes * height
         
-        // CRITICAL: Create data buffer that will be copied, not retained
         var bytes = [UInt8](repeating: 0, count: length)
         let region = MTLRegionMake2D(0, 0, width, height)
         
@@ -197,7 +196,6 @@ final class MetalImageRenderer: Sendable {
         let colorSpace = CGColorSpaceCreateDeviceRGB()
         let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.premultipliedLast.rawValue)
         
-        // Create data with .copy behavior to avoid retaining original buffer
         guard let data = CFDataCreate(nil, bytes, length) else { return nil }
         guard let provider = CGDataProvider(data: data) else { return nil }
         

Sources/iDither/ViewModel/DitherViewModel.swift

@@ -4,6 +4,11 @@ import ImageIO
 import AppKit
 import UniformTypeIdentifiers
 
+// Helper for Swift 6 Concurrency
+struct SendableCGImage: @unchecked Sendable {
+    let image: CGImage
+}
+
 enum DitherAlgorithm: Int, CaseIterable, Identifiable {
     case noDither = 0
     case bayer2x2 = 1
@@ -175,21 +180,26 @@ class DitherViewModel {
             
             print("🔄 Processing image with algorithm: \(self.selectedAlgorithm.name)")
             
-            self.renderTask = Task.detached(priority: .userInitiated) { [input, renderer, params] in
+            // Wrap CGImage in a Sendable wrapper to satisfy strict concurrency
+            let sendableInput = SendableCGImage(image: input)
+            
+            // ✅ CHANGÉ : Enlève @MainActor de la Task
+            self.renderTask = Task { [sendableInput, renderer, params] in
                 if Task.isCancelled { 
                     print("⚠️ Render task cancelled before starting")
                     return 
                 }
                 
-                let result = renderer.render(input: input, params: params)
+                // Le rendu s'exécute sur un thread d'arrière-plan (performant)
+                let result = await renderer.render(input: sendableInput.image, params: params)
                 
                 if Task.isCancelled { 
                     print("⚠️ Render task cancelled after render")
                     return 
                 }
                 
+                // Dispatch vers MainActor UNIQUEMENT pour la mise à jour UI
                 await MainActor.run {
-                    if Task.isCancelled { return }
                     print("✅ Render complete, updating UI")
                     self.processedImage = result
                 }