From 78760fd8a5b310ca4e8de502e510b95c9b4c880c Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Mon, 9 Oct 2023 22:25:54 +0800
Subject: ...

---
 .../graphics/web_canvas/WebCanvasPainter.h         | 16 +++++++++++++++
 .../platform/graphics/web_canvas/WebCanvasRef.h    | 24 ++++++++++++++++++++++
 include/cru/platform/web/JsUtility.h               |  9 ++++++++
 3 files changed, 49 insertions(+)
 create mode 100644 include/cru/platform/graphics/web_canvas/WebCanvasRef.h
 create mode 100644 include/cru/platform/web/JsUtility.h

(limited to 'include')

diff --git a/include/cru/platform/graphics/web_canvas/WebCanvasPainter.h b/include/cru/platform/graphics/web_canvas/WebCanvasPainter.h
index cd885aa4..1f7d21b6 100644
--- a/include/cru/platform/graphics/web_canvas/WebCanvasPainter.h
+++ b/include/cru/platform/graphics/web_canvas/WebCanvasPainter.h
@@ -1,11 +1,20 @@
 #pragma once
 #include "../Painter.h"
+#include "WebCanvasRef.h"
 #include "WebCanvasResource.h"
 
 #include <emscripten/val.h>
 #include <optional>
 
 namespace cru::platform::graphics::web_canvas {
+/**
+ * Notes about Transform:
+ * Although there is a Matrix object now supported by browsers, it is not
+ * generally available in old browsers. However, now that we are using
+ * WebAssembly, the browsers should be quite up to date, but there is still a
+ * window between the two things. And it is common for a platform to not support
+ * getting transform and only allow you to do transformation.
+ */
 class WebCanvasPainter : public WebCanvasResource, public virtual IPainter {
  public:
   WebCanvasPainter(WebCanvasGraphicsFactory* factory, emscripten::val context,
@@ -17,6 +26,13 @@ class WebCanvasPainter : public WebCanvasResource, public virtual IPainter {
   Matrix GetTransform() override;
   void SetTransform(const Matrix& transform) override;
 
+  void ConcatTransform(const Matrix& matrix) override;
+
+  void Clear(const Color& color) override;
+
+  emscripten::val GetCanvas2DContext() const { return context_; }
+  WebCanvasRef GetCanvas();
+
  private:
   Matrix current_transform_;
   emscripten::val context_;
diff --git a/include/cru/platform/graphics/web_canvas/WebCanvasRef.h b/include/cru/platform/graphics/web_canvas/WebCanvasRef.h
new file mode 100644
index 00000000..4cb960bd
--- /dev/null
+++ b/include/cru/platform/graphics/web_canvas/WebCanvasRef.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include "cru/common/Base.h"
+
+#include <emscripten/val.h>
+
+namespace cru::platform::graphics::web_canvas {
+  class WebCanvasRef {
+    public:
+      explicit WebCanvasRef(emscripten::val canvas_val);
+
+      CRU_DEFAULT_COPY(WebCanvasRef)
+      CRU_DEFAULT_MOVE(WebCanvasRef)
+
+      CRU_DEFAULT_DESTRUCTOR(WebCanvasRef)
+
+    public:
+      int GetWidth() const;
+      int GetHeight() const;
+
+    private:
+      emscripten::val val_;
+  };
+}
diff --git a/include/cru/platform/web/JsUtility.h b/include/cru/platform/web/JsUtility.h
new file mode 100644
index 00000000..37c2735d
--- /dev/null
+++ b/include/cru/platform/web/JsUtility.h
@@ -0,0 +1,9 @@
+#pragma once
+
+#include <emscripten/val.h>
+
+namespace cru::platform::web {
+  bool IsNotNullAndInstanceOf(const emscripten::val& value, const emscripten::val& type);
+  bool IsNotNullAndInstanceOf(const emscripten::val& value, const char* global_type);
+}
+
-- 
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