Add first rendering tests

Macaw.xcodeproj/project.pbxproj

@@ -454,6 +454,8 @@
 		5B7E79CF20CBE69700C50BCF /* masking-path-02-b-manual.svg in Resources */ = {isa = PBXBuildFile; fileRef = 5B7E79CD20CBE69700C50BCF /* masking-path-02-b-manual.svg */; };
 		5B7E79DE20D2781A00C50BCF /* masking-intro-01-f-manual.reference in Resources */ = {isa = PBXBuildFile; fileRef = 5B7E79DC20D2781A00C50BCF /* masking-intro-01-f-manual.reference */; };
 		5B7E79DF20D2781A00C50BCF /* masking-intro-01-f-manual.svg in Resources */ = {isa = PBXBuildFile; fileRef = 5B7E79DD20D2781A00C50BCF /* masking-intro-01-f-manual.svg */; };
+		5B8C8E7D20EA0568002AEA29 /* paths-data-04-t-manual.jpg in Resources */ = {isa = PBXBuildFile; fileRef = 5B8C8E7C20EA0568002AEA29 /* paths-data-04-t-manual.jpg */; };
+		5B8C8E8120EA192F002AEA29 /* color-prop-01-b-manual.jpg in Resources */ = {isa = PBXBuildFile; fileRef = 5B8C8E7F20EA192F002AEA29 /* color-prop-01-b-manual.jpg */; };
 		5BAE201F208E1211006BF277 /* SVGCanvas.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5BAE201E208E1211006BF277 /* SVGCanvas.swift */; };
 		5BAE2038208E163D006BF277 /* polyline.reference in Resources */ = {isa = PBXBuildFile; fileRef = 5BAE2022208E1637006BF277 /* polyline.reference */; };
 		5BAE2039208E163D006BF277 /* polygon.reference in Resources */ = {isa = PBXBuildFile; fileRef = 5BAE2023208E1637006BF277 /* polygon.reference */; };
@@ -854,6 +856,8 @@
 		5B7E79CD20CBE69700C50BCF /* masking-path-02-b-manual.svg */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = "masking-path-02-b-manual.svg"; sourceTree = "<group>"; };
 		5B7E79DC20D2781A00C50BCF /* masking-intro-01-f-manual.reference */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = "masking-intro-01-f-manual.reference"; sourceTree = "<group>"; };
 		5B7E79DD20D2781A00C50BCF /* masking-intro-01-f-manual.svg */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = "masking-intro-01-f-manual.svg"; sourceTree = "<group>"; };
+		5B8C8E7C20EA0568002AEA29 /* paths-data-04-t-manual.jpg */ = {isa = PBXFileReference; lastKnownFileType = image.jpeg; path = "paths-data-04-t-manual.jpg"; sourceTree = "<group>"; };
+		5B8C8E7F20EA192F002AEA29 /* color-prop-01-b-manual.jpg */ = {isa = PBXFileReference; lastKnownFileType = image.jpeg; path = "color-prop-01-b-manual.jpg"; sourceTree = "<group>"; };
 		5BAE201E208E1211006BF277 /* SVGCanvas.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SVGCanvas.swift; sourceTree = "<group>"; };
 		5BAE2022208E1637006BF277 /* polyline.reference */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = polyline.reference; sourceTree = "<group>"; };
 		5BAE2023208E1637006BF277 /* polygon.reference */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = polygon.reference; sourceTree = "<group>"; };
@@ -1313,6 +1317,8 @@
 		5B1AE18320B6A669007EECCB /* w3cSVGTests */ = {
 			isa = PBXGroup;
 			children = (
+				5B8C8E7F20EA192F002AEA29 /* color-prop-01-b-manual.jpg */,
+				5B8C8E7C20EA0568002AEA29 /* paths-data-04-t-manual.jpg */,
 				5B1AE22D20B6A669007EECCB /* color-prop-01-b-manual.reference */,
 				5B1AE18A20B6A669007EECCB /* color-prop-01-b-manual.svg */,
 				5B1AE22C20B6A669007EECCB /* color-prop-02-f-manual.reference */,
@@ -1746,6 +1752,7 @@
 				5B1AE2B620B6A669007EECCB /* paths-data-04-t-manual.svg in Resources */,
 				5B1AE25620B6A669007EECCB /* paths-data-05-t-manual.reference in Resources */,
 				5B1AE2D020B6A669007EECCB /* struct-defs-01-t-manual.reference in Resources */,
+				5B8C8E8120EA192F002AEA29 /* color-prop-01-b-manual.jpg in Resources */,
 				5B1AE25020B6A669007EECCB /* render-elems-01-t-manual.reference in Resources */,
 				5B1AE24520B6A669007EECCB /* struct-frag-01-t-manual.reference in Resources */,
 				5B1AE25B20B6A669007EECCB /* painting-stroke-01-t-manual.svg in Resources */,
@@ -1766,6 +1773,7 @@
 				5B37139B20BE95D7004BB6EE /* pservers-grad-07-b-manual.svg in Resources */,
 				5B1AE2B920B6A669007EECCB /* painting-control-02-f-manual.svg in Resources */,
 				5B7E79DE20D2781A00C50BCF /* masking-intro-01-f-manual.reference in Resources */,
+				5B8C8E7D20EA0568002AEA29 /* paths-data-04-t-manual.jpg in Resources */,
 				5B1AE28A20B6A669007EECCB /* shapes-polygon-01-t-manual.reference in Resources */,
 				5B1AE27920B6A669007EECCB /* shapes-circle-01-t-manual.svg in Resources */,
 				5B1AE25E20B6A669007EECCB /* paths-data-17-f-manual.reference in Resources */,

MacawTests/MacawSVGTests.swift

@@ -210,7 +210,7 @@ class MacawSVGTests: XCTestCase {
     }
 
     func testColorProp01() {
-        validateJSON("color-prop-01-b-manual")
+        validateJSONAndImage("color-prop-01-b-manual")
     }
 
     func testShapesEllipse01() {
@@ -534,7 +534,7 @@ class MacawSVGTests: XCTestCase {
     }
 
     func testPathsData04() {
-        validateJSON("paths-data-04-t-manual")
+        validateJSONAndImage("paths-data-04-t-manual")
     }
 
     func testPaintingStroke04() {
@@ -572,4 +572,80 @@ class MacawSVGTests: XCTestCase {
     func testMaskingIntro01() {
         validateJSON("masking-intro-01-f-manual")
     }
+
+    func saveImage(image: UIImage, fileName: String) -> URL? {
+        guard let data = UIImageJPEGRepresentation(image, 0.6) else {
+            return .none
+        }
+        guard let directory = try? FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false) as NSURL else {
+            return .none
+        }
+        do {
+            let path = directory.appendingPathComponent("\(fileName).jpg")!
+            try data.write(to: path)
+            return path
+        } catch {
+            print(error.localizedDescription)
+            return .none
+        }
+    }
+
+    func imageForTest(_ test: String) -> UIImage {
+        let bundle = Bundle(for: type(of: TestUtils()))
+        do {
+            let node = try SVGParser.parse(bundle: bundle, path: test)
+            var frame = node.bounds
+            if frame == nil, let group = node as? Group {
+                frame = Group(contents: group.contents).bounds
+            }
+            let view = MacawView(node: node, frame: frame!.toCG())
+            let renderer = RenderUtils.createNodeRenderer(node, view: view, animationCache: view.animationCache)
+            let image = renderer.renderToImage(bounds: frame!)
+            return UIImage(cgImage: image.cgImage!, scale: 1.0, orientation: UIImageOrientation.downMirrored)
+        } catch {
+            XCTFail(error.localizedDescription)
+        }
+        XCTFail()
+        return UIImage()
+    }
+
+    func testA() {
+        createImage("paths-data-04-t-manual")
+    }
+
+    func createImage(_ test: String) {
+        if saveImage(image: imageForTest(test), fileName: test) == nil {
+            XCTFail()
+        }
+    }
+
+    func validateImage(_ test: String) {
+        let image = imageForTest(test)
+        let tempPath = saveImage(image: image, fileName: "temp")
+        let nodeImage = UIImage(contentsOfFile: tempPath!.path)!
+        validateImage(nodeImage: nodeImage, referenceFile: test)
+    }
+
+    func validateImage(nodeImage: UIImage, referenceFile: String) {
+        let bundle = Bundle(for: type(of: TestUtils()))
+        guard let path = bundle.path(forResource: referenceFile, ofType: "jpg") else {
+            XCTFail("No reference file \(referenceFile)")
+            return
+        }
+
+        let referenceImage = UIImage(contentsOfFile: path)
+        let referenceContent = UIImagePNGRepresentation(referenceImage!)!
+        let nodeContent = UIImagePNGRepresentation(nodeImage)!
+
+        if referenceContent != nodeContent {
+            let referencePath = saveImage(image: referenceImage!, fileName: referenceFile + "_reference")
+            let _ = saveImage(image: nodeImage, fileName: referenceFile + "_incorrect")
+            XCTFail("Not equal, see both pictures in \(String(describing: referencePath!.deletingLastPathComponent().path))")
+        }
+    }
+
+    func validateJSONAndImage(_ test: String) {
+        validateJSON(test)
+        validateImage(test)
+    }
 }