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diff --git a/include/minikin/Debug.h b/include/minikin/Debug.h
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+++ b/include/minikin/Debug.h
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+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MINIKIN_DEBUG_H
+#define MINIKIN_DEBUG_H
+
+#include <string>
+
+namespace minikin {
+
+struct Point;
+struct MinikinRect;
+struct MinikinExtent;
+struct MinikinPaint;
+struct FontFeature;
+class Range;
+class U16StringPiece;
+class LayoutPiece;
+
+namespace debug {
+
+// Convert UTF16 string to std::string for debugging purpose.
+std::string toUtf8(const U16StringPiece& text);
+
+std::string toString(const Point& point);
+std::string toString(const MinikinRect& rect);
+std::string toString(const Range& range);
+std::string toString(const MinikinExtent& extent);
+std::string toString(const LayoutPiece& layout);
+std::string toString(const MinikinPaint& paint);
+std::string toString(const FontFeature& feature);
+std::string toString(const std::vector<FontFeature>& features);
+
+}  // namespace debug
+
+}  // namespace minikin
+#endif  // MINIKIN_DEBUG_H