9 files changed, 168 insertions, 0 deletions
diff --git a/include/cru/platform/graphics/Base.hpp b/include/cru/platform/graphics/Base.hpp
new file mode 100644
index 00000000..e751ebdb
--- /dev/null
+++ b/include/cru/platform/graphics/Base.hpp
@@ -0,0 +1,24 @@
+#pragma once
+#include "../GraphBase.hpp"
+#include "../Matrix.hpp"
+#include "../Resource.hpp"
+
+#include <memory>
+
+namespace cru::platform::graphics {
+// forward declarations
+struct IGraphFactory;
+struct IBrush;
+struct ISolidColorBrush;
+struct IFont;
+struct IGeometry;
+struct IGeometryBuilder;
+struct IPainter;
+struct ITextLayout;
+
+struct TextHitTestResult {
+  int position;
+  bool trailing;
+  bool insideText;
+};
+}  // namespace cru::platform::graph
diff --git a/include/cru/platform/graphics/Brush.hpp b/include/cru/platform/graphics/Brush.hpp
new file mode 100644
index 00000000..10c666b5
--- /dev/null
+++ b/include/cru/platform/graphics/Brush.hpp
@@ -0,0 +1,11 @@
+#pragma once
+#include "Resource.hpp"
+
+namespace cru::platform::graphics {
+struct IBrush : virtual IGraphResource {};
+
+struct ISolidColorBrush : virtual IBrush {
+  virtual Color GetColor() = 0;
+  virtual void SetColor(const Color& color) = 0;
+};
+}  // namespace cru::platform::graph
diff --git a/include/cru/platform/graphics/Factory.hpp b/include/cru/platform/graphics/Factory.hpp
new file mode 100644
index 00000000..d1b37783
--- /dev/null
+++ b/include/cru/platform/graphics/Factory.hpp
@@ -0,0 +1,25 @@
+#pragma once
+#include "Resource.hpp"
+
+#include "Brush.hpp"
+#include "Font.hpp"
+#include "Geometry.hpp"
+#include "TextLayout.hpp"
+
+#include <string>
+#include <string_view>
+
+namespace cru::platform::graphics {
+// Entry point of the graph module.
+struct IGraphFactory : virtual INativeResource {
+  virtual std::unique_ptr<ISolidColorBrush> CreateSolidColorBrush() = 0;
+
+  virtual std::unique_ptr<IGeometryBuilder> CreateGeometryBuilder() = 0;
+
+  virtual std::unique_ptr<IFont> CreateFont(std::u16string font_family,
+                                            float font_size) = 0;
+
+  virtual std::unique_ptr<ITextLayout> CreateTextLayout(
+      std::shared_ptr<IFont> font, std::u16string text) = 0;
+};
+}  // namespace cru::platform::graph
diff --git a/include/cru/platform/graphics/Font.hpp b/include/cru/platform/graphics/Font.hpp
new file mode 100644
index 00000000..70392a69
--- /dev/null
+++ b/include/cru/platform/graphics/Font.hpp
@@ -0,0 +1,8 @@
+#pragma once
+#include "Resource.hpp"
+
+namespace cru::platform::graphics {
+struct IFont : virtual IGraphResource {
+  virtual float GetFontSize() = 0;
+};
+}  // namespace cru::platform::graph
diff --git a/include/cru/platform/graphics/Geometry.hpp b/include/cru/platform/graphics/Geometry.hpp
new file mode 100644
index 00000000..b0ce6ad9
--- /dev/null
+++ b/include/cru/platform/graphics/Geometry.hpp
@@ -0,0 +1,20 @@
+#pragma once
+#include "Resource.hpp"
+
+namespace cru::platform::graphics {
+struct IGeometry : virtual IGraphResource {
+  virtual bool FillContains(const Point& point) = 0;
+};
+
+// After called Build, calling every method will throw a
+
+struct IGeometryBuilder : virtual IGraphResource {
+  virtual void BeginFigure(const Point& point) = 0;
+  virtual void LineTo(const Point& point) = 0;
+  virtual void QuadraticBezierTo(const Point& control_point,
+                                 const Point& end_point) = 0;
+  virtual void CloseFigure(bool close) = 0;
+
+  virtual std::unique_ptr<IGeometry> Build() = 0;
+};
+}  // namespace cru::platform::graph
diff --git a/include/cru/platform/graphics/Painter.hpp b/include/cru/platform/graphics/Painter.hpp
new file mode 100644
index 00000000..76140c32
--- /dev/null
+++ b/include/cru/platform/graphics/Painter.hpp
@@ -0,0 +1,29 @@
+#pragma once
+#include "Resource.hpp"
+
+namespace cru::platform::graphics {
+
+struct IPainter : virtual INativeResource {
+  virtual Matrix GetTransform() = 0;
+  virtual void SetTransform(const Matrix& matrix) = 0;
+
+  virtual void Clear(const Color& color) = 0;
+
+  virtual void StrokeRectangle(const Rect& rectangle, IBrush* brush,
+                               float width) = 0;
+  virtual void FillRectangle(const Rect& rectangle, IBrush* brush) = 0;
+
+  virtual void StrokeGeometry(IGeometry* geometry, IBrush* brush,
+                              float width) = 0;
+  virtual void FillGeometry(IGeometry* geometry, IBrush* brush) = 0;
+
+  virtual void DrawText(const Point& offset, ITextLayout* text_layout,
+                        IBrush* brush) = 0;
+
+  virtual void PushLayer(const Rect& bounds) = 0;
+
+  virtual void PopLayer() = 0;
+
+  virtual void EndDraw() = 0;
+};
+}  // namespace cru::platform::graph
diff --git a/include/cru/platform/graphics/Resource.hpp b/include/cru/platform/graphics/Resource.hpp
new file mode 100644
index 00000000..a1625ce4
--- /dev/null
+++ b/include/cru/platform/graphics/Resource.hpp
@@ -0,0 +1,10 @@
+#pragma once
+#include "Base.hpp"
+
+namespace cru::platform::graphics {
+struct IGraphFactory;
+
+struct IGraphResource : virtual INativeResource {
+  virtual IGraphFactory* GetGraphFactory() = 0;
+};
+}  // namespace cru::platform::graph
diff --git a/include/cru/platform/graphics/TextLayout.hpp b/include/cru/platform/graphics/TextLayout.hpp
new file mode 100644
index 00000000..efd017d6
--- /dev/null
+++ b/include/cru/platform/graphics/TextLayout.hpp
@@ -0,0 +1,24 @@
+#pragma once
+#include "Resource.hpp"
+
+#include <string>
+#include <vector>
+
+namespace cru::platform::graphics {
+struct ITextLayout : virtual IGraphResource {
+  virtual std::u16string GetText() = 0;
+  virtual std::u16string_view GetTextView() = 0;
+  virtual void SetText(std::u16string new_text) = 0;
+
+  virtual std::shared_ptr<IFont> GetFont() = 0;
+  virtual void SetFont(std::shared_ptr<IFont> font) = 0;
+
+  virtual void SetMaxWidth(float max_width) = 0;
+  virtual void SetMaxHeight(float max_height) = 0;
+
+  virtual Rect GetTextBounds() = 0;
+  virtual std::vector<Rect> TextRangeRect(const TextRange& text_range) = 0;
+  virtual Point TextSinglePoint(Index position, bool trailing) = 0;
+  virtual TextHitTestResult HitTest(const Point& point) = 0;
+};
+}  // namespace cru::platform::graph
diff --git a/include/cru/platform/graphics/util/Painter.hpp b/include/cru/platform/graphics/util/Painter.hpp
new file mode 100644
index 00000000..af3a1997
--- /dev/null
+++ b/include/cru/platform/graphics/util/Painter.hpp
@@ -0,0 +1,17 @@
+#pragma once
+#include "../Painter.hpp"
+
+#include <functional>
+#include <type_traits>
+
+namespace cru::platform::graphics::util {
+template <typename Fn>
+void WithTransform(IPainter* painter, const Matrix& matrix, const Fn& action) {
+  static_assert(std::is_invocable_v<decltype(action), IPainter*>,
+                "Action must can be be invoked with painter.");
+  const auto old = painter->GetTransform();
+  painter->SetTransform(old * matrix);
+  action(painter);
+  painter->SetTransform(old);
+}
+}  // namespace cru::platform::graphics::util