18 files changed, 363 insertions, 39 deletions
diff --git a/include/cru/platform/basic_types.hpp b/include/cru/platform/basic_types.hpp
index 67637b83..81ee3e34 100644
--- a/include/cru/platform/basic_types.hpp
+++ b/include/cru/platform/basic_types.hpp
@@ -7,5 +7,4 @@ struct Dpi {
 };
 
 enum class MouseButton { Left, Right, Middle };
-
 }  // namespace cru::platform
diff --git a/include/cru/platform/brush.hpp b/include/cru/platform/brush.hpp
new file mode 100644
index 00000000..713d302d
--- /dev/null
+++ b/include/cru/platform/brush.hpp
@@ -0,0 +1,13 @@
+#pragma once
+#include "cru/common/base.hpp"
+
+#include "cru/common/ui_base.hpp"
+
+namespace cru::platform {
+struct Brush : public virtual Interface {};
+
+struct SolidColorBrush : public virtual Brush {
+  virtual ui::Color GetColor() = 0;
+  virtual void SetColor(const ui::Color& color) = 0;
+};
+}  // namespace cru::platform
diff --git a/include/cru/platform/debug.hpp b/include/cru/platform/debug.hpp
index 24759ee1..21c2b646 100644
--- a/include/cru/platform/debug.hpp
+++ b/include/cru/platform/debug.hpp
@@ -4,5 +4,5 @@
 #include <string_view>
 
 namespace cru::platform::debug {
-void DebugMessage(const std::string_view& message);
+void DebugMessage(const std::wstring_view& message);
 }
diff --git a/include/cru/platform/dpi_util.hpp b/include/cru/platform/dpi_util.hpp
deleted file mode 100644
index 3c0ae6ca..00000000
--- a/include/cru/platform/dpi_util.hpp
+++ /dev/null
@@ -1,32 +0,0 @@
-#pragma once
-#include "ui_applicaition.hpp"
-
-namespace cru::platform {
-inline Dpi GetDpi() {
-  return UiApplication::GetInstance()->GetDpi();
-}
-
-inline int DipToPixelInternal(const float dip, const float dpi) {
-  return static_cast<int>(dip * dpi / 96.0f);
-}
-
-inline int DipToPixelX(const float dip_x) {
-  return DipToPixelInternal(dip_x, GetDpi().x);
-}
-
-inline int DipToPixelY(const float dip_y) {
-  return DipToPixelInternal(dip_y, GetDpi().y);
-}
-
-inline float DipToPixelInternal(const int pixel, const float dpi) {
-  return static_cast<float>(pixel) * 96.0f / dpi;
-}
-
-inline float PixelToDipX(const int pixel_x) {
-  return DipToPixelInternal(pixel_x, GetDpi().x);
-}
-
-inline float PixelToDipY(const int pixel_y) {
-  return DipToPixelInternal(pixel_y, GetDpi().y);
-}
-}  // namespace cru::platform
diff --git a/include/cru/platform/geometry.hpp b/include/cru/platform/geometry.hpp
new file mode 100644
index 00000000..aa93fe37
--- /dev/null
+++ b/include/cru/platform/geometry.hpp
@@ -0,0 +1,26 @@
+#pragma once
+#include "cru/common/base.hpp"
+
+#include "basic_types.hpp"
+#include "cru/common/ui_base.hpp"
+
+namespace cru::platform {
+struct Geometry : virtual Interface {
+  virtual bool FillContains(const ui::Point& point) = 0;
+};
+
+struct GeometryBuilder : virtual Interface {
+  virtual bool IsValid() = 0;
+  virtual void BeginFigure(const ui::Point& point) = 0;
+  virtual void LineTo(const ui::Point& point) = 0;
+  virtual void QuadraticBezierTo(const ui::Point& control_point,
+                                 const ui::Point& end_point) = 0;
+  virtual void CloseFigure(bool close) = 0;
+  virtual Geometry* Build() = 0;
+
+  Geometry* BuildAndDeleteThis() {
+    Build();
+    delete this;
+  }
+};
+}  // namespace cru::platform
diff --git a/include/cru/platform/graph_factory.hpp b/include/cru/platform/graph_factory.hpp
new file mode 100644
index 00000000..f2e5f286
--- /dev/null
+++ b/include/cru/platform/graph_factory.hpp
@@ -0,0 +1,14 @@
+#pragma once
+#include "cru/common/base.hpp"
+
+#include "cru/common/ui_base.hpp"
+
+namespace cru::platform {
+struct SolidColorBrush;
+struct GeometryBuilder;
+
+struct GraphFactory : virtual Interface {
+  virtual SolidColorBrush* CreateSolidColorBrush(const ui::Color& color) = 0;
+  virtual GeometryBuilder* CreateGeometryBuilder() = 0;
+};
+}  // namespace cru::platform
diff --git a/include/cru/platform/native_window.hpp b/include/cru/platform/native_window.hpp
index 5e8897ab..3a8e27ad 100644
--- a/include/cru/platform/native_window.hpp
+++ b/include/cru/platform/native_window.hpp
@@ -32,7 +32,7 @@ struct NativeWindow : public virtual Interface {
   // The lefttop of the rect is relative to screen lefttop.
   virtual void SetWindowRect(const ui::Rect& rect) = 0;
 
-  virtual Painter* GetPainter() = 0;
+  virtual Painter* BeginDraw() = 0;
 
   virtual Event<>* DestroyEvent() = 0;
   virtual Event<ui::Size>* ResizeEvent() = 0;
diff --git a/include/cru/platform/painter.hpp b/include/cru/platform/painter.hpp
new file mode 100644
index 00000000..4ad09247
--- /dev/null
+++ b/include/cru/platform/painter.hpp
@@ -0,0 +1,15 @@
+#pragma once
+#include "cru/common/base.hpp"
+
+#include "cru/common/ui_base.hpp"
+
+namespace cru::platform {
+struct Brush;
+struct Geometry;
+
+struct Painter : virtual Interface {
+  virtual void StrokeGeometry(Geometry* geometry, Brush* brush, float width) = 0;
+  virtual void FillGeometry(Geometry* geometry, Brush* brush) = 0;
+  virtual void EndDraw() = 0;
+};
+}  // namespace cru::platform
diff --git a/include/cru/platform/ui_applicaition.hpp b/include/cru/platform/ui_applicaition.hpp
index e149166b..1f30ce17 100644
--- a/include/cru/platform/ui_applicaition.hpp
+++ b/include/cru/platform/ui_applicaition.hpp
@@ -27,8 +27,6 @@ struct UiApplication : public virtual Interface {
   virtual std::vector<NativeWindow*> GetAllWindow() = 0;
   virtual NativeWindow* CreateWindow() = 0;
 
-  virtual Dpi GetDpi() = 0;
-
   virtual GraphFactory* GetGraphFactory() = 0;
 };
 }  // namespace cru::platform
diff --git a/include/cru/platform/win/d2d_util.hpp b/include/cru/platform/win/d2d_util.hpp
new file mode 100644
index 00000000..9ff6556a
--- /dev/null
+++ b/include/cru/platform/win/d2d_util.hpp
@@ -0,0 +1,91 @@
+#pragma once
+#include "win_pre_config.hpp"
+
+#include "cru/common/ui_base.hpp"
+
+namespace cru::platform::win::util {
+inline D2D1_COLOR_F Convert(const ui::Color& color) {
+  return D2D1::ColorF(color.red / 255.0f, color.green / 255.0f,
+                      color.blue / 255.0f, color.alpha / 255.0f);
+}
+
+inline D2D1_POINT_2F Convert(const ui::Point& point) {
+  return D2D1::Point2F(point.x, point.y);
+}
+
+inline D2D1_RECT_F Convert(const ui::Rect& rect) {
+  return D2D1::RectF(rect.left, rect.top, rect.left + rect.width,
+                     rect.top + rect.height);
+}
+
+inline D2D1_ROUNDED_RECT Convert(const ui::RoundedRect& rounded_rect) {
+  return D2D1::RoundedRect(Convert(rounded_rect.rect), rounded_rect.radius_x,
+                           rounded_rect.radius_y);
+}
+
+inline D2D1_ELLIPSE Convert(const ui::Ellipse& ellipse) {
+  return D2D1::Ellipse(Convert(ellipse.center), ellipse.radius_x,
+                       ellipse.radius_y);
+}
+
+inline ui::Color Convert(const D2D1_COLOR_F& color) {
+  auto floor = [](float n) { return static_cast<std::uint8_t>(n + 0.5f); };
+  return ui::Color{floor(color.r * 255.0f), floor(color.g * 255.0f),
+                   floor(color.b * 255.0f), floor(color.a * 255.0f)};
+}
+
+inline ui::Point Convert(const D2D1_POINT_2F& point) {
+  return ui::Point(point.x, point.y);
+}
+
+inline ui::Rect Convert(const D2D1_RECT_F& rect) {
+  return ui::Rect(rect.left, rect.top, rect.right - rect.left,
+                  rect.bottom - rect.top);
+}
+
+inline ui::RoundedRect Convert(const D2D1_ROUNDED_RECT& rounded_rect) {
+  return ui::RoundedRect(Convert(rounded_rect.rect), rounded_rect.radiusX,
+                         rounded_rect.radiusY);
+}
+
+inline ui::Ellipse Convert(const D2D1_ELLIPSE& ellipse) {
+  return ui::Ellipse(Convert(ellipse.point), ellipse.radiusX, ellipse.radiusY);
+}
+
+inline bool operator==(const D2D1_POINT_2F& left, const D2D1_POINT_2F& right) {
+  return left.x == right.x && left.y == right.y;
+}
+
+inline bool operator!=(const D2D1_POINT_2F& left, const D2D1_POINT_2F& right) {
+  return !(left == right);
+}
+
+inline bool operator==(const D2D1_RECT_F& left, const D2D1_RECT_F& right) {
+  return left.left == right.left && left.top == right.top &&
+         left.right == right.right && left.bottom == right.bottom;
+}
+
+inline bool operator!=(const D2D1_RECT_F& left, const D2D1_RECT_F& right) {
+  return !(left == right);
+}
+
+inline bool operator==(const D2D1_ROUNDED_RECT& left,
+                       const D2D1_ROUNDED_RECT& right) {
+  return left.rect == right.rect && left.radiusX == right.radiusX &&
+         left.radiusY == right.radiusY;
+}
+
+inline bool operator!=(const D2D1_ROUNDED_RECT& left,
+                       const D2D1_ROUNDED_RECT& right) {
+  return !(left == right);
+}
+
+inline bool operator==(const D2D1_ELLIPSE& left, const D2D1_ELLIPSE& right) {
+  return left.point == right.point && left.radiusX == right.radiusX &&
+         left.radiusY == right.radiusY;
+}
+
+inline bool operator!=(const D2D1_ELLIPSE& left, const D2D1_ELLIPSE& right) {
+  return !(left == right);
+}
+}  // namespace cru::platform::win::util
diff --git a/include/cru/platform/win/graph_manager.hpp b/include/cru/platform/win/graph_manager.hpp
new file mode 100644
index 00000000..f2e29c22
--- /dev/null
+++ b/include/cru/platform/win/graph_manager.hpp
@@ -0,0 +1,44 @@
+#pragma once
+#include "win_pre_config.hpp"
+
+#include "../basic_types.hpp"
+#include "cru/common/base.hpp"
+
+namespace cru::platform::win {
+class WindowRenderTarget;
+
+class GraphManager final : public Object {
+ public:
+  GraphManager();
+  GraphManager(const GraphManager& other) = delete;
+  GraphManager(GraphManager&& other) = delete;
+  GraphManager& operator=(const GraphManager& other) = delete;
+  GraphManager& operator=(GraphManager&& other) = delete;
+  ~GraphManager() override = default;
+
+ public:
+  ID2D1Factory1* GetD2D1Factory() const { return d2d1_factory_.Get(); }
+
+  ID2D1DeviceContext* GetD2D1DeviceContext() const {
+    return d2d1_device_context_.Get();
+  }
+
+  ID3D11Device* GetD3D11Device() const { return d3d11_device_.Get(); }
+
+  IDXGIFactory2* GetDxgiFactory() const { return dxgi_factory_.Get(); }
+
+  IDWriteFactory* GetDWriteFactory() const { return dwrite_factory_.Get(); }
+
+  IDWriteFontCollection* GetSystemFontCollection() const {
+    return dwrite_system_font_collection_.Get();
+  }
+
+ private:
+  Microsoft::WRL::ComPtr<ID3D11Device> d3d11_device_;
+  Microsoft::WRL::ComPtr<ID2D1Factory1> d2d1_factory_;
+  Microsoft::WRL::ComPtr<ID2D1DeviceContext> d2d1_device_context_;
+  Microsoft::WRL::ComPtr<IDXGIFactory2> dxgi_factory_;
+  Microsoft::WRL::ComPtr<IDWriteFactory> dwrite_factory_;
+  Microsoft::WRL::ComPtr<IDWriteFontCollection> dwrite_system_font_collection_;
+};
+}  // namespace cru::platform::win
diff --git a/include/cru/platform/win/win_application.hpp b/include/cru/platform/win/win_application.hpp
index fcc0a7c9..7defa703 100644
--- a/include/cru/platform/win/win_application.hpp
+++ b/include/cru/platform/win/win_application.hpp
@@ -10,6 +10,8 @@ namespace cru::platform::win {
 class GodWindow;
 class TimerManager;
 class WindowManager;
+class GraphManager;
+class WinGraphFactory;
 
 class WinApplication : public Object, public virtual UiApplication {
  public:
@@ -39,13 +41,16 @@ class WinApplication : public Object, public virtual UiApplication {
                             const std::function<void()>& action) override;
   void CancelTimer(unsigned long id) override;
 
+  GraphFactory* GetGraphFactory() override;
+
+
   HINSTANCE GetInstanceHandle() const { return h_instance_; }
 
   GodWindow* GetGodWindow() const { return god_window_.get(); }
-
   TimerManager* GetTimerManager() const { return timer_manager_.get(); }
-
   WindowManager* GetWindowManager() const { return window_manager_.get(); }
+  GraphManager* GetGraphManager() const { return graph_manager_.get(); }
+  WinGraphFactory* GetWinGraphFactory() const { return graph_factory_.get(); }
 
  private:
   HINSTANCE h_instance_;
@@ -53,5 +58,7 @@ class WinApplication : public Object, public virtual UiApplication {
   std::shared_ptr<GodWindow> god_window_;
   std::shared_ptr<TimerManager> timer_manager_;
   std::shared_ptr<WindowManager> window_manager_;
+  std::shared_ptr<GraphManager> graph_manager_;
+  std::shared_ptr<WinGraphFactory> graph_factory_;
 };
 }  // namespace cru::platform::win
diff --git a/include/cru/platform/win/win_brush.hpp b/include/cru/platform/win/win_brush.hpp
new file mode 100644
index 00000000..2668215d
--- /dev/null
+++ b/include/cru/platform/win/win_brush.hpp
@@ -0,0 +1,23 @@
+#pragma once
+#include "win_pre_config.hpp"
+
+#include "../brush.hpp"
+
+namespace cru::platform::win {
+class WinSolidColorBrush : public Object, public virtual SolidColorBrush {
+ public:
+  explicit WinSolidColorBrush(
+      Microsoft::WRL::ComPtr<ID2D1SolidColorBrush> brush);
+  WinSolidColorBrush(const WinSolidColorBrush& other) = delete;
+  WinSolidColorBrush(WinSolidColorBrush&& other) = delete;
+  WinSolidColorBrush& operator=(const WinSolidColorBrush& other) = delete;
+  WinSolidColorBrush& operator=(WinSolidColorBrush&& other) = delete;
+  ~WinSolidColorBrush() override = default;
+
+  ui::Color GetColor() override;
+  void SetColor(const ui::Color& color) override;
+
+ private:
+  Microsoft::WRL::ComPtr<ID2D1SolidColorBrush> brush_;
+};
+}  // namespace cru::platform::win
diff --git a/include/cru/platform/win/win_geometry.hpp b/include/cru/platform/win/win_geometry.hpp
new file mode 100644
index 00000000..e8ab7796
--- /dev/null
+++ b/include/cru/platform/win/win_geometry.hpp
@@ -0,0 +1,45 @@
+#pragma once
+#include "win_pre_config.hpp"
+
+#include "../geometry.hpp"
+
+namespace cru::platform::win {
+class WinGeometryBuilder : public Object, public virtual GeometryBuilder {
+ public:
+  explicit WinGeometryBuilder(Microsoft::WRL::ComPtr<ID2D1PathGeometry> geometry);
+  WinGeometryBuilder(const WinGeometryBuilder& other) = delete;
+  WinGeometryBuilder(WinGeometryBuilder&& other) = delete;
+  WinGeometryBuilder& operator=(const WinGeometryBuilder& other) = delete;
+  WinGeometryBuilder& operator=(WinGeometryBuilder&& other) = delete;
+  ~WinGeometryBuilder() override;
+
+  bool IsValid() override { return geometry_ != nullptr; }
+  void BeginFigure(const ui::Point& point) override;
+  void LineTo(const ui::Point& point) override;
+  void QuadraticBezierTo(const ui::Point& control_point,
+                         const ui::Point& end_point) override;
+  void CloseFigure(bool close) override;
+  Geometry* Build() override;
+
+ private:
+  Microsoft::WRL::ComPtr<ID2D1PathGeometry> geometry_;
+  Microsoft::WRL::ComPtr<ID2D1GeometrySink> geometry_sink_;
+};
+
+class WinGeometry : public Object, public virtual Geometry {
+ public:
+  explicit WinGeometry(Microsoft::WRL::ComPtr<ID2D1PathGeometry> geometry);
+  WinGeometry(const WinGeometry& other) = delete;
+  WinGeometry(WinGeometry&& other) = delete;
+  WinGeometry& operator=(const WinGeometry& other) = delete;
+  WinGeometry& operator=(WinGeometry&& other) = delete;
+  ~WinGeometry() override = default;
+
+  bool FillContains(const ui::Point& point) override;
+
+  ID2D1PathGeometry* GetNative() const { return geometry_.Get(); }
+
+ private:
+  Microsoft::WRL::ComPtr<ID2D1PathGeometry> geometry_;
+};
+}  // namespace cru::platform::win
diff --git a/include/cru/platform/win/win_graph_factory.hpp b/include/cru/platform/win/win_graph_factory.hpp
new file mode 100644
index 00000000..b49413e4
--- /dev/null
+++ b/include/cru/platform/win/win_graph_factory.hpp
@@ -0,0 +1,24 @@
+#pragma once
+#include "win_pre_config.hpp"
+
+#include "../graph_factory.hpp"
+
+namespace cru::platform::win {
+class GraphManager;
+
+class WinGraphFactory : public Object, public virtual GraphFactory {
+ public:
+  explicit WinGraphFactory(GraphManager* graph_manager);
+  WinGraphFactory(const WinGraphFactory& other) = delete;
+  WinGraphFactory(WinGraphFactory&& other) = delete;
+  WinGraphFactory& operator=(const WinGraphFactory& other) = delete;
+  WinGraphFactory& operator=(WinGraphFactory&& other) = delete;
+  ~WinGraphFactory() override = default;
+
+  SolidColorBrush* CreateSolidColorBrush(const ui::Color& color) override;
+  GeometryBuilder* CreateGeometryBuilder() override;
+
+ private:
+  GraphManager* graph_manager_;
+};
+}  // namespace cru::platform::win
diff --git a/include/cru/platform/win/win_native_window.hpp b/include/cru/platform/win/win_native_window.hpp
index 9deac767..8b787485 100644
--- a/include/cru/platform/win/win_native_window.hpp
+++ b/include/cru/platform/win/win_native_window.hpp
@@ -10,6 +10,7 @@ namespace cru::platform::win {
 class WinApplication;
 class WindowClass;
 class WindowManager;
+class WindowRenderTarget;
 
 class WinNativeWindow : public Object, public virtual NativeWindow {
  public:
@@ -70,6 +71,10 @@ class WinNativeWindow : public Object, public virtual NativeWindow {
   bool HandleNativeWindowMessage(HWND hwnd, UINT msg, WPARAM w_param,
                                  LPARAM l_param, LRESULT* result);
 
+  WindowRenderTarget* GetWindowRenderTarget() const {
+    return window_render_target_.get();
+  }
+
  private:
   // Get the client rect in pixel.
   RECT GetClientRectPixel();
@@ -107,6 +112,8 @@ class WinNativeWindow : public Object, public virtual NativeWindow {
   bool has_focus_ = false;
   bool is_mouse_in_ = false;
 
+  std::shared_ptr<WindowRenderTarget> window_render_target_;
+
   Event<> destroy_event_;
   Event<ui::Size> resize_event_;
   Event<> paint_event_;
diff --git a/include/cru/platform/win/win_pre_config.hpp b/include/cru/platform/win/win_pre_config.hpp
index 2e8bb80e..d6ba4ec7 100644
--- a/include/cru/platform/win/win_pre_config.hpp
+++ b/include/cru/platform/win/win_pre_config.hpp
@@ -4,3 +4,9 @@
 #define WIN32_LEAN_AND_MEAN
 #include <Windows.h>
 #undef CreateWindow
+
+#include <d2d1_2.h>
+#include <d3d11.h>
+#include <dwrite.h>
+#include <dxgi1_2.h>
+#include <wrl/client.h>
diff --git a/include/cru/platform/win/window_render_target.hpp b/include/cru/platform/win/window_render_target.hpp
new file mode 100644
index 00000000..f328a84a
--- /dev/null
+++ b/include/cru/platform/win/window_render_target.hpp
@@ -0,0 +1,44 @@
+#pragma once
+#include "win_pre_config.hpp"
+
+#include "cru/common/base.hpp"
+
+
+namespace cru::platform::win {
+class GraphManager;
+
+// Represents a window render target.
+class WindowRenderTarget : public Object {
+ public:
+  WindowRenderTarget(GraphManager* graph_manager, HWND hwnd);
+  WindowRenderTarget(const WindowRenderTarget& other) = delete;
+  WindowRenderTarget(WindowRenderTarget&& other) = delete;
+  WindowRenderTarget& operator=(const WindowRenderTarget& other) = delete;
+  WindowRenderTarget& operator=(WindowRenderTarget&& other) = delete;
+  ~WindowRenderTarget() override = default;
+
+ public:
+  // Get the graph manager that created the render target.
+  GraphManager* GetGraphManager() const { return graph_manager_; }
+
+  // Get the target bitmap which can be set as the ID2D1DeviceContext's target.
+  ID2D1Bitmap1* GetTargetBitmap() const { return target_bitmap_.Get(); }
+
+  // Resize the underlying buffer.
+  void ResizeBuffer(int width, int height);
+
+  // Set this render target as the d2d device context's target.
+  void SetAsTarget();
+
+  // Present the data of the underlying buffer to the window.
+  void Present();
+
+ private:
+  void CreateTargetBitmap();
+
+ private:
+  GraphManager* graph_manager_;
+  Microsoft::WRL::ComPtr<IDXGISwapChain1> dxgi_swap_chain_;
+  Microsoft::WRL::ComPtr<ID2D1Bitmap1> target_bitmap_;
+};
+}  // namespace cru::graph