...

1 files changed, 18 insertions, 0 deletions

diff --git a/include/cru/platform/graphics/util/Painter.h b/include/cru/platform/graphics/util/Painter.h
new file mode 100644
index 00000000..e36d5c55
--- /dev/null
+++ b/include/cru/platform/graphics/util/Painter.h
@@ -0,0 +1,18 @@
+#pragma once
+#include "../Painter.h"
+
+#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->PushState();
+  painter->ConcatTransform(matrix);
+  action(painter);
+  painter->PopState();
+}
+}  // namespace cru::platform::graphics::util