From 6aa2201797a9ed64ce0178215ae941d0c5f09579 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Fri, 30 Oct 2020 00:07:57 +0800
Subject: ...

---
 include/cru/platform/graphics/util/Painter.hpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 include/cru/platform/graphics/util/Painter.hpp

(limited to 'include/cru/platform/graphics/util')

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
-- 
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