LibWeb: Extract CanvasRect class from CRC2D

This one requires drawing to the canvas, so it doesn't make so much
sense to move the implementation over.

Userland/Libraries/LibWeb/HTML/Canvas/CanvasRect.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+namespace Web::HTML {
+
+// https://html.spec.whatwg.org/multipage/canvas.html#canvasrect
+class CanvasRect {
+public:
+    virtual ~CanvasRect() = default;
+
+    virtual void fill_rect(float x, float y, float width, float height) = 0;
+    virtual void stroke_rect(float x, float y, float width, float height) = 0;
+    virtual void clear_rect(float x, float y, float width, float height) = 0;
+
+protected:
+    CanvasRect() = default;
+};
+
+}

Userland/Libraries/LibWeb/HTML/Canvas/CanvasRect.idl

@@ -0,0 +1,6 @@
+// https://html.spec.whatwg.org/multipage/canvas.html#canvasrect
+interface mixin CanvasRect {
+    undefined clearRect(unrestricted double x, unrestricted double y, unrestricted double w, unrestricted double h);
+    undefined fillRect(unrestricted double x, unrestricted double y, unrestricted double w, unrestricted double h);
+    undefined strokeRect(unrestricted double x, unrestricted double y, unrestricted double w, unrestricted double h);
+};

Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h

@@ -18,6 +18,7 @@
 #include <LibWeb/DOM/ExceptionOr.h>
 #include <LibWeb/HTML/Canvas/CanvasFillStrokeStyles.h>
 #include <LibWeb/HTML/Canvas/CanvasPath.h>
+#include <LibWeb/HTML/Canvas/CanvasRect.h>
 #include <LibWeb/HTML/Canvas/CanvasState.h>
 #include <LibWeb/HTML/Canvas/CanvasTransform.h>
 #include <LibWeb/HTML/CanvasGradient.h>
@@ -36,7 +37,8 @@ class CanvasRenderingContext2D
     , public CanvasPath
     , public CanvasState
     , public CanvasTransform<CanvasRenderingContext2D>
-    , public CanvasFillStrokeStyles<CanvasRenderingContext2D> {
+    , public CanvasFillStrokeStyles<CanvasRenderingContext2D>
+    , public CanvasRect {
 
     AK_MAKE_NONCOPYABLE(CanvasRenderingContext2D);
     AK_MAKE_NONMOVABLE(CanvasRenderingContext2D);
@@ -47,9 +49,9 @@ public:
     static NonnullRefPtr<CanvasRenderingContext2D> create(HTMLCanvasElement& element) { return adopt_ref(*new CanvasRenderingContext2D(element)); }
     ~CanvasRenderingContext2D();
 
-    void fill_rect(float x, float y, float width, float height);
+    virtual void fill_rect(float x, float y, float width, float height) override;
-    void stroke_rect(float x, float y, float width, float height);
+    virtual void stroke_rect(float x, float y, float width, float height) override;
-    void clear_rect(float x, float y, float width, float height);
+    virtual void clear_rect(float x, float y, float width, float height) override;
 
     DOM::ExceptionOr<void> draw_image(CanvasImageSource const&, float destination_x, float destination_y);
     DOM::ExceptionOr<void> draw_image(CanvasImageSource const&, float destination_x, float destination_y, float destination_width, float destination_height);

Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.idl

@@ -4,6 +4,7 @@
 #import <HTML/TextMetrics.idl>
 #import <HTML/Canvas/CanvasFillStrokeStyles.idl>
 #import <HTML/Canvas/CanvasPath.idl>
+#import <HTML/Canvas/CanvasRect.idl>
 #import <HTML/Canvas/CanvasState.idl>
 #import <HTML/Canvas/CanvasTransform.idl>
 #import <HTML/Path2D.idl>
@@ -12,10 +13,6 @@
 [Exposed=Window]
 interface CanvasRenderingContext2D {
 
-    undefined fillRect(double x, double y, double w, double h);
-    undefined strokeRect(double x, double y, double w, double h);
-    undefined clearRect(double x, double y, double w, double h);
-
     undefined beginPath();
     // FIXME: `DOMString` should be `CanvasFillRule`
     undefined fill(optional DOMString fillRule = "nonzero");
@@ -51,4 +48,5 @@ interface CanvasRenderingContext2D {
 CanvasRenderingContext2D includes CanvasState;
 CanvasRenderingContext2D includes CanvasTransform;
 CanvasRenderingContext2D includes CanvasFillStrokeStyles;
+CanvasRenderingContext2D includes CanvasRect;
 CanvasRenderingContext2D includes CanvasPath;