convert Mask to GraphicsElement

Author: swhitty

DOM/Sources/DOM.SVG.swift

@@ -80,9 +80,14 @@ package extension DOM {
         package var childElements = [GraphicsElement]()
     }
 
-    struct Mask: ContainerElement {
-        package var id: String
+    final class Mask: GraphicsElement, ContainerElement {
         package var childElements = [GraphicsElement]()
+
+        init(id: String, childElements: [GraphicsElement] = []) {
+            super.init()
+            self.id = id
+            self.childElements = childElements
+        }
     }
 
     struct StyleSheet {

DOM/Sources/Parser.XML.SVG.swift

@@ -176,8 +176,12 @@ package extension XMLParser {
         let att = try parseAttributes(e)
         let id: String = try att.parseString("id")
 
-        let children = try parseGraphicsElements(e.children)
-        return DOM.Mask(id: id, childElements: children)
+        let mask = DOM.Mask(id: id)
+        mask.class = try att.parseString("class")
+        mask.attributes = try parsePresentationAttributes(e)
+        mask.style = try parseStyleAttributes(e)
+        mask.childElements = try parseGraphicsElements(e.children)
+        return mask
     }
 
     func parsePatterns(_ e: XML.Element) throws -> [DOM.Pattern] {

Samples.bundle/robin.svg

@@ -190,8 +190,9 @@ extension LayerTree {
 
             let l = Layer()
 
+            let maskState = createState(for: mask, inheriting: State())
             mask.childElements.forEach {
-                let contents = Layer.Contents.layer(makeLayer(from: $0, inheriting: State()))
+                let contents = Layer.Contents.layer(makeLayer(from: $0, inheriting: maskState))
                 l.appendContents(contents)
             }
 

SwiftDraw/Sources/LayerTree/LayerTree.Builder.swift

@@ -54,17 +54,20 @@ final class LayerTreeBuilderTests: XCTestCase {
   func testDOMMaskMakesLayer() {
     let circle = DOM.Circle(cx: 5, cy: 5, r: 5)
     let line = DOM.Line(x1: 0, y1: 0, x2: 10, y2: 0)
+    let mask = DOM.Mask(id: "mask1", childElements: [circle, line])
+    mask.attributes.fill = .color(.keyword(.white))
+
     let svg = DOM.SVG(width: 10, height: 10)
-    svg.defs.masks.append(DOM.Mask(id: "mask1", childElements: [circle, line]))
-    
+    svg.defs.masks.append(mask)
+
     let builder = LayerTree.Builder(svg: svg)
 
     let element = DOM.GraphicsElement()
     element.attributes.mask = URL(string: "#mask1")
 
     let layer = builder.createMaskLayer(for: element)
-    
     XCTAssertEqual(layer?.contents.count, 2)
+    XCTAssertEqual(layer?.contents[0].shape?.fill.fill, .color(.white))
   }
 
   func testDOMClipMakesShape() {
@@ -206,3 +209,10 @@ extension DOM.Group {
         return group
     }
 }
+
+private extension LayerTree.Layer.Contents {
+    var shape: (shape: LayerTree.Shape, stroke: LayerTree.StrokeAttributes, fill: LayerTree.FillAttributes)? {
+        guard case let .shape(shape, stroke, fill) = self else { return nil }
+        return (shape, stroke, fill)
+    }
+}