Fix window resizing (stale scene) + impl Image support in WinUIBackend

Author: stackotter

Examples/Sources/WindowingExample/WindowingApp.swift

@@ -42,7 +42,7 @@ struct WindowingApp: App {
             }
         }
         .defaultSize(width: 200, height: 200)
-        .windowResizability(.contentSize)
+        .windowResizability(.contentMinSize)
 
         WindowGroup("Tertiary window") {
             #hotReloadable {
@@ -51,6 +51,6 @@ struct WindowingApp: App {
             }
         }
         .defaultSize(width: 200, height: 200)
-        .windowResizability(.contentSize)
+        .windowResizability(.contentMinSize)
     }
 }

Sources/SwiftCrossUI/Scenes/WindowGroupNode.swift

@@ -49,7 +49,7 @@ public final class WindowGroupNode<Content: View>: SceneGraphNode {
                 return
             }
             _ = self.update(
-                scene,
+                self.scene,
                 proposedWindowSize: newSize,
                 backend: backend,
                 environment: parentEnvironment
@@ -108,7 +108,7 @@ public final class WindowGroupNode<Content: View>: SceneGraphNode {
                 //   scene's body. I have a vague feeling that it wouldn't work in all cases?
                 //   But I don't have the time to come up with a counterexample right now.
                 _ = self.update(
-                    scene,
+                    self.scene,
                     proposedWindowSize: backend.size(ofWindow: window),
                     backend: backend,
                     environment: environment

Sources/WinUIBackend/WinUIBackend.swift

@@ -585,20 +585,34 @@ public struct WinUIBackend: AppBackend {
         (textField as! TextBox).text
     }
 
-    // public func createImageView(filePath: String) -> Widget {
-    //     let image = Image()
-    //     let bitMapImage = BitmapImage()
-    //     bitMapImage.uriSource = Uri(filePath)
-    //     image.source = bitMapImage
-    //     image.minHeight = 5
-    //     return image
-    // }
+    public func createImageView() -> Widget {
+        WinUI.Image()
+    }
+
+    public func updateImageView(
+        _ imageView: Widget,
+        rgbaData: [UInt8],
+        width: Int,
+        height: Int,
+        targetWidth: Int,
+        targetHeight: Int,
+        dataHasChanged: Bool
+    ) {
+        let imageView = imageView as! WinUI.Image
+        let bitmap = WriteableBitmap(Int32(width), Int32(height))
+        let buffer = try! bitmap.pixelBuffer.buffer!
+        memcpy(buffer, rgbaData, min(Int(bitmap.pixelBuffer.length), rgbaData.count))
+
+        // Convert RGBA to BGRA in-place.
+        for i in 0..<(width * height) {
+            let offset = i * 4
+            let tmp = buffer[offset]
+            buffer[offset] = buffer[offset + 2]
+            buffer[offset + 2] = tmp
+        }
 
-    // public func updateImageView(_ imageView: Widget, filePath: String) {
-    //     let bitMapImage = BitmapImage()
-    //     bitMapImage.uriSource = Uri(filePath)
-    //     (imageView as! WinUI.Image).source = bitMapImage
-    // }
+        imageView.source = bitmap
+    }
 
     // public func createOneOfContainer() -> Widget {
     //     let frame = Frame()