2 files changed, 11 insertions, 2 deletions
diff --git a/include/cru/osx/graphics/quartz/Convert.hpp b/include/cru/osx/graphics/quartz/Convert.hpp
new file mode 100644
index 00000000..9706dc00
--- /dev/null
+++ b/include/cru/osx/graphics/quartz/Convert.hpp
@@ -0,0 +1,9 @@
+#pragma once
+#include "cru/platform/Matrix.hpp"
+
+#include <CoreGraphics/CoreGraphics.h>
+
+namespace cru::platform::graphics::osx::quartz {
+  CGAffineTransform Convert(const Matrix& matrix);
+  Matrix Convert(const CGAffineTransform& matrix);
+}
diff --git a/include/cru/osx/graphics/quartz/Painter.hpp b/include/cru/osx/graphics/quartz/Painter.hpp
index 2d77ab3a..7f775210 100644
--- a/include/cru/osx/graphics/quartz/Painter.hpp
+++ b/include/cru/osx/graphics/quartz/Painter.hpp
@@ -8,7 +8,7 @@ namespace cru::platform::graphics::osx::quartz {
 class QuartzCGContextPainter : public OsxQuartzResource,
                                public virtual IPainter {
  public:
-  explicit QuartzCGContextPainter(CGContext* cg_context)
+  explicit QuartzCGContextPainter(CGContextRef cg_context)
       : cg_context_(cg_context) {}
 
  public:
@@ -36,6 +36,6 @@ class QuartzCGContextPainter : public OsxQuartzResource,
   void EndDraw() override;
 
  private:
-  CGContext* cg_context_;
+  CGContextRef cg_context_;
 };
 }  // namespace cru::platform::graphics::osx::quartz