feat: save quads by batch

Memola/Canvas/Contexts/GraphicContext.swift

@@ -160,6 +160,7 @@ extension GraphicContext {
         guard currentPoint != nil, let currentStroke = currentStroke?.stroke(as: PenStroke.self) else { return }
         currentStroke.finish(at: point)
         tree.insert(currentStroke.anyStroke, in: currentStroke.strokeBox)
+        currentStroke.saveQuads()
         withPersistence(\.backgroundContext) { [currentStroke] context in
             guard let stroke = currentStroke.stroke(as: PenStroke.self) else { return }
             stroke.object?.bounds = stroke.bounds

Memola/Canvas/Geometries/Stroke/Strokes/PenStroke.swift

@@ -28,6 +28,9 @@ final class PenStroke: Stroke, @unchecked Sendable {
 
     var object: StrokeObject?
 
+    let batchSize: Int = 50
+    var batchIndex: Int = 0
+
     init(
         bounds: [CGFloat],
         color: [CGFloat],
@@ -84,7 +87,17 @@ final class PenStroke: Stroke, @unchecked Sendable {
             max(quad.originX.cgFloat, bounds[2]),
             max(quad.originY.cgFloat, bounds[3])
         ]
-        withPersistence(\.backgroundContext) { [object, _quad = quad] context in
+        if quads.endIndex >= batchIndex + batchSize {
+            saveQuads(to: batchIndex + batchSize)
+        }
+    }
+
+    func saveQuads(to endIndex: Int? = nil) {
+        let endIndex = endIndex ?? quads.endIndex
+        let batch = quads[batchIndex..<endIndex]
+        batchIndex = endIndex
+        withPersistence(\.backgroundContext) { [object, quads = batch] context in
+            for _quad in quads {
                 let quad = QuadObject(\.backgroundContext)
                 quad.originX = _quad.originX.cgFloat
                 quad.originY = _quad.originY.cgFloat
@@ -97,3 +110,4 @@ final class PenStroke: Stroke, @unchecked Sendable {
             }
         }
     }
+}