Update BlendMode

Author: Kyle-Ye

Sources/OpenSwiftUICore/Shape/ShapeStyle/BlendMode.swift

@@ -2,8 +2,8 @@
 //  BlendMode.swift
 //  OpenSwiftUICore
 //
-//  Audited for 6.0.87
-//  Status: WIP
+//  Audited for 6.5.4
+//  Status: Complete
 
 // MARK: - BlendMode
 
@@ -33,7 +33,9 @@ public enum BlendMode: Sendable {
     case plusLighter
 }
 
+@available(OpenSwiftUI_v3_0, *)
 extension ShapeStyle {
+
     /// Returns a new style based on `self` that applies the specified
     /// blend mode when drawing.
     @inlinable
@@ -42,7 +44,9 @@ extension ShapeStyle {
     }
 }
 
+@available(OpenSwiftUI_v4_0, *)
 extension ShapeStyle where Self == AnyShapeStyle {
+
     /// Returns a new style based on the current style that uses
     /// `mode` as its blend mode when drawing.
     ///
@@ -64,42 +68,51 @@ extension ShapeStyle where Self == AnyShapeStyle {
     }
 }
 
+@available(OpenSwiftUI_v3_0, *)
 @frozen
 public struct _BlendModeShapeStyle<Style>: ShapeStyle, PrimitiveShapeStyle where Style: ShapeStyle {
     public var style: Style
+
     public var blendMode: BlendMode
-    @inlinable public init(style: Style, blendMode: BlendMode) {
+
+    @inlinable
+    public init(style: Style, blendMode: BlendMode) {
         self.style = style
         self.blendMode = blendMode
     }
 
     public func _apply(to shape: inout _ShapeStyle_Shape) {
         switch shape.operation {
-            case .fallbackColor, .modifyBackground:
+        case .prepareText:
+            if blendMode == .normal {
                 style._apply(to: &shape)
-            case .prepareText:
-                if blendMode == .normal {
-                    style._apply(to: &shape)
-                } else {
-                    shape.result = .preparedText(.foregroundKeyColor)
-                }
-            default:
-                _openSwiftUIUnimplementedFailure()
-//            case resolveStyle(name: _ShapeStyle_Name, levels: Range<Int>):
-//                
-//                
-//            case .multiLevel:
-//                <#code#>
-//            case .copyStyle(let name):
-//                <#code#>
-//            case .primaryStyle:
-//                <#code#>
+            } else {
+                shape.result = .preparedText(.foregroundKeyColor)
+            }
+        case let .resolveStyle(name: name, levels: levels):
+            style._apply(to: &shape)
+            let blend = GraphicsBlendMode(blendMode)
+            shape.stylePack.modify(
+                name: name,
+                levels: levels
+            ) { style in
+                style.applyBlend(blend)
+            }
+        case .fallbackColor, .modifyBackground, .multiLevel:
+            style._apply(to: &shape)
+        case let .copyStyle(name: name):
+            style.mapCopiedStyle(in: &shape) { style in
+                _BlendModeShapeStyle<AnyShapeStyle>(
+                    style: style,
+                    blendMode: blendMode
+                )
+            }
+        case .primaryStyle:
+            break
         }
     }
 
     public static func _apply(to type: inout _ShapeStyle_ShapeType) {
         Style._apply(to: &type)
     }
-    
-    public typealias Resolved = Never
 }

Sources/OpenSwiftUICore/Shape/ShapeStyle/ShapeStylePack.swift

@@ -10,8 +10,8 @@ package struct _ShapeStyle_Pack: Equatable {
     package struct Style: Equatable, Sendable {
         package var fill: _ShapeStyle_Pack.Fill
         package var opacity: Float
-        package var _blend: GraphicsBlendMode?
-        
+        private var _blend: GraphicsBlendMode?
+
         package var blend: GraphicsBlendMode {
             _blend ?? .normal
         }
@@ -122,7 +122,11 @@ package struct _ShapeStyle_Pack: Equatable {
             }
         }
     }
-    
+
+    private func indices(of name: ShapeStyle.Name) -> Range<Int> {
+        _openSwiftUIUnimplementedFailure()
+    }
+
     package subscript(name: _ShapeStyle_Name) -> _ShapeStyle_Pack.Slice {
         Slice(pack: self, name: name)
     }
@@ -148,8 +152,20 @@ package struct _ShapeStyle_Pack: Equatable {
         }
     }
 
-    package mutating func modify(name: _ShapeStyle_Name, levels: Range<Int>, _ modifier: (inout _ShapeStyle_Pack.Style) -> Void) {
-        _openSwiftUIUnimplementedFailure()
+    package mutating func modify(
+        name: ShapeStyle.Name,
+        levels: Range<Int>,
+        _ modifier: (inout ShapeStyle.Pack.Style) -> Void
+    ) {
+        let indices = indices(of: name)
+        guard !indices.isEmpty else { return }
+        var modifiedStyles = styles
+        for index in indices {
+            if levels.contains(modifiedStyles[index].key.level) {
+                modifier(&modifiedStyles[index].style)
+            }
+        }
+        styles = modifiedStyles
     }
 
     package mutating func adjustLevelIndices(of name: _ShapeStyle_Name, by offset: Int) {
@@ -200,9 +216,17 @@ extension _ShapeStyle_Pack.Style {
     }
 
     package mutating func applyBlend(_ blend: GraphicsBlendMode) {
-        _openSwiftUIUnimplementedFailure()
+        let shouldApply = !_SemanticFeature_v6.isEnabled
+        if shouldApply || _blend == nil {
+            _blend = blend
+        }
+        for index in effects.indices {
+            if shouldApply || effects[index]._blend == nil {
+                effects[index]._blend = blend
+            }
+        }
     }
-    
+
     package var color: Color.Resolved? {
         _openSwiftUIUnimplementedFailure()
     }
@@ -213,17 +237,24 @@ extension _ShapeStyle_Pack.Style {
 // MARK: - _ShapeStyle_Shape + _ShapeStyle_Pack
 
 extension _ShapeStyle_Shape {
-    package var stylePack: _ShapeStyle_Pack {
+    package var stylePack: ShapeStyle.Pack {
         get {
             switch result {
                 case let .pack(pack): pack
                 default: .defaultValue
             }
         }
         _modify {
-            var pack = stylePack
-            yield &pack
-            result = .pack(pack)
+            var styles: ShapeStyle.Pack
+            switch result {
+            case let .pack(pack):
+                styles = pack
+                result = .none
+            default:
+                styles = .defaultValue
+            }
+            yield &styles
+            result = .pack(styles)
         }
     }
 }