From 7d435b5adacdaa8f038669d10fba9f615265897a Mon Sep 17 00:00:00 2001
From: Linus Groh <mail@linusgroh.de>
Date: Mon, 27 Dec 2021 14:31:23 +0100
Subject: [PATCH] LibWeb: Implement CanvasRenderingContext2D.save()

---
 .../Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp     | 7 +++++++
 Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h  | 3 +++
 .../Libraries/LibWeb/HTML/CanvasRenderingContext2D.idl     | 2 ++
 3 files changed, 12 insertions(+)

diff --git a/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp b/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
index 1cade07f81..a7eab5c996 100644
--- a/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
+++ b/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
@@ -313,4 +313,11 @@ void CanvasRenderingContext2D::put_image_data(const ImageData& image_data, float
     did_draw(Gfx::FloatRect(x, y, image_data.width(), image_data.height()));
 }
 
+// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-save
+void CanvasRenderingContext2D::save()
+{
+    // The save() method steps are to push a copy of the current drawing state onto the drawing state stack.
+    m_drawing_state_stack.append(m_drawing_state);
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h b/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h
index 90e7cf7c9b..7d2552a370 100644
--- a/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h
+++ b/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h
@@ -69,6 +69,8 @@ public:
     RefPtr<ImageData> create_image_data(int width, int height) const;
     void put_image_data(const ImageData&, float x, float y);
 
+    void save();
+
     HTMLCanvasElement* canvas() { return m_element; }
 
 private:
@@ -89,6 +91,7 @@ private:
     };
 
     DrawingState m_drawing_state;
+    Vector<DrawingState> m_drawing_state_stack;
 
     Gfx::Path m_path;
 };
diff --git a/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.idl b/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.idl
index c5a5b7bf6f..05b5870207 100644
--- a/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.idl
+++ b/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.idl
@@ -31,6 +31,8 @@ interface CanvasRenderingContext2D {
     ImageData createImageData(double sw, double sh);
     undefined putImageData(ImageData imagedata, double dx, double dy);
 
+    undefined save();
+
     readonly attribute HTMLCanvasElement canvas;
 
 };