LibWeb: Implement Path2D class

Author: https://github.com/AtkinsSJ
Commit: https://github.com/SerenityOS/serenity/commit/2ec52bbbd5
Pull-request: https://github.com/SerenityOS/serenity/pull/14839

Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator/IDLGenerators.cpp

@@ -56,6 +56,8 @@ static bool is_wrappable_type(Type const& type)
         return true;
     if (type.name == "Blob")
         return true;
+    if (type.name == "Path2D")
+        return true;
     return false;
 }
 

Userland/Libraries/LibWeb/Bindings/WindowObjectHelper.h

@@ -279,6 +279,8 @@
 #include <LibWeb/Bindings/OptionConstructor.h>
 #include <LibWeb/Bindings/PageTransitionEventConstructor.h>
 #include <LibWeb/Bindings/PageTransitionEventPrototype.h>
+#include <LibWeb/Bindings/Path2DConstructor.h>
+#include <LibWeb/Bindings/Path2DPrototype.h>
 #include <LibWeb/Bindings/PerformanceConstructor.h>
 #include <LibWeb/Bindings/PerformancePrototype.h>
 #include <LibWeb/Bindings/PerformanceTimingConstructor.h>
@@ -518,6 +520,7 @@
     ADD_WINDOW_OBJECT_INTERFACE(NodeIterator)                                                       \
     ADD_WINDOW_OBJECT_INTERFACE(NodeList)                                                           \
     ADD_WINDOW_OBJECT_INTERFACE(PageTransitionEvent)                                                \
+    ADD_WINDOW_OBJECT_INTERFACE(Path2D)                                                             \
     ADD_WINDOW_OBJECT_INTERFACE(Performance)                                                        \
     ADD_WINDOW_OBJECT_INTERFACE(PerformanceTiming)                                                  \
     ADD_WINDOW_OBJECT_INTERFACE(ProcessingInstruction)                                              \

Userland/Libraries/LibWeb/CMakeLists.txt

@@ -232,6 +232,7 @@ set(SOURCES
     HTML/Parser/HTMLTokenizer.cpp
     HTML/Parser/ListOfActiveFormattingElements.cpp
     HTML/Parser/StackOfOpenElements.cpp
+    HTML/Path2D.cpp
     HTML/Scripting/ClassicScript.cpp
     HTML/Scripting/Environments.cpp
     HTML/Scripting/ExceptionReporter.cpp

Userland/Libraries/LibWeb/Forward.h

@@ -295,6 +295,7 @@ class MessagePort;
 struct NavigationParams;
 class Origin;
 class PageTransitionEvent;
+class Path2D;
 struct PolicyContainer;
 class PromiseRejectionEvent;
 class WorkerDebugConsoleClient;
@@ -582,6 +583,7 @@ class NodeListWrapper;
 class NodeWrapper;
 class OptionConstructor;
 class PageTransitionEventWrapper;
+class Path2DWrapper;
 class PerformanceTimingWrapper;
 class PerformanceWrapper;
 class ProcessingInstructionWrapper;

Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp

@@ -17,6 +17,7 @@
 #include <LibWeb/HTML/HTMLCanvasElement.h>
 #include <LibWeb/HTML/HTMLImageElement.h>
 #include <LibWeb/HTML/ImageData.h>
+#include <LibWeb/HTML/Path2D.h>
 #include <LibWeb/HTML/TextMetrics.h>
 #include <LibWeb/HTML/Window.h>
 #include <LibWeb/Layout/TextNode.h>

Userland/Libraries/LibWeb/HTML/Path2D.cpp

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/HTML/Path2D.h>
+
+namespace Web::HTML {
+
+// https://html.spec.whatwg.org/multipage/canvas.html#dom-path2d
+Path2D::Path2D(Optional<Variant<NonnullRefPtr<Path2D>, String>> const& path)
+{
+    // 1. Let output be a new Path2D object.
+    // 2. If path is not given, then return output.
+    if (!path.has_value())
+        return;
+
+    // 3. If path is a Path2D object, then add all subpaths of path to output and return output.
+    //    (In other words, it returns a copy of the argument.)
+    if (path->has<NonnullRefPtr<Path2D>>()) {
+        this->path() = path->get<NonnullRefPtr<Path2D>>()->path();
+        return;
+    }
+
+    dbgln("TODO: Implement constructing Path2D object with an SVG path string");
+
+    // FIXME: 4. Let svgPath be the result of parsing and interpreting path according to SVG 2's rules for path data. [SVG]
+    // FIXME: 5. Let (x, y) be the last point in svgPath.
+    // FIXME: 6. Add all the subpaths, if any, from svgPath to output.
+    // FIXME: 7. Create a new subpath in output with (x, y) as the only point in the subpath.
+    // FIXME: 8. Return output.
+}
+
+}

Userland/Libraries/LibWeb/HTML/Path2D.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/RefCounted.h>
+#include <LibGfx/Path.h>
+#include <LibWeb/Bindings/Wrappable.h>
+#include <LibWeb/HTML/Canvas/CanvasPath.h>
+
+namespace Web::HTML {
+
+// https://html.spec.whatwg.org/multipage/canvas.html#path2d
+class Path2D
+    : public RefCounted<Path2D>
+    , public Bindings::Wrappable
+    , public CanvasPath {
+
+    AK_MAKE_NONCOPYABLE(Path2D);
+    AK_MAKE_NONMOVABLE(Path2D);
+
+public:
+    using WrapperType = Bindings::Path2DWrapper;
+
+    static NonnullRefPtr<Path2D> create_with_global_object(Bindings::WindowObject&, Optional<Variant<NonnullRefPtr<Path2D>, String>> const& path) { return adopt_ref(*new Path2D(path)); }
+    static NonnullRefPtr<Path2D> create(Optional<Variant<NonnullRefPtr<Path2D>, String>> const& path) { return adopt_ref(*new Path2D(path)); }
+    ~Path2D() = default;
+
+private:
+    Path2D(Optional<Variant<NonnullRefPtr<Path2D>, String>> const&);
+};
+
+}

Userland/Libraries/LibWeb/HTML/Path2D.idl

@@ -0,0 +1,11 @@
+#import <HTML/Canvas/CanvasPath.idl>
+
+// https://html.spec.whatwg.org/multipage/canvas.html#path2d
+[Exposed=(Window,Worker)]
+interface Path2D {
+    constructor(optional (Path2D or DOMString) path);
+
+    // FIXME: undefined addPath(Path2D path, optional DOMMatrix2DInit transform = {});
+};
+
+Path2D includes CanvasPath;

Userland/Libraries/LibWeb/idl_files.cmake

@@ -145,6 +145,7 @@ libweb_js_wrapper(HTML/MessageChannel)
 libweb_js_wrapper(HTML/MessageEvent)
 libweb_js_wrapper(HTML/MessagePort)
 libweb_js_wrapper(HTML/PageTransitionEvent)
+libweb_js_wrapper(HTML/Path2D)
 libweb_js_wrapper(HTML/PromiseRejectionEvent)
 libweb_js_wrapper(HTML/Storage)
 libweb_js_wrapper(HTML/SubmitEvent)