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diff --git a/src/utils/segmentation_map.h b/src/utils/segmentation_map.h
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+/*
+ * Copyright 2019 The libgav1 Authors
+ *
+ * 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 LIBGAV1_SRC_UTILS_SEGMENTATION_MAP_H_
+#define LIBGAV1_SRC_UTILS_SEGMENTATION_MAP_H_
+
+#include <cstdint>
+#include <memory>
+
+#include "src/utils/array_2d.h"
+#include "src/utils/compiler_attributes.h"
+
+namespace libgav1 {
+
+// SegmentationMap stores the segment id associated with each 4x4 block in the
+// frame.
+class SegmentationMap {
+ public:
+  SegmentationMap() = default;
+
+  // Not copyable or movable
+  SegmentationMap(const SegmentationMap&) = delete;
+  SegmentationMap& operator=(const SegmentationMap&) = delete;
+
+  // Allocates an internal buffer of the given dimensions to hold the
+  // segmentation map. The memory in the buffer is not initialized. Returns
+  // true on success, false on failure (for example, out of memory).
+  LIBGAV1_MUST_USE_RESULT bool Allocate(int32_t rows4x4, int32_t columns4x4);
+
+  int8_t segment_id(int row4x4, int column4x4) const {
+    return segment_id_[row4x4][column4x4];
+  }
+
+  // Sets every element in the segmentation map to 0.
+  void Clear();
+
+  // Copies the entire segmentation map. |from| must be of the same dimensions.
+  void CopyFrom(const SegmentationMap& from);
+
+  // Sets the region of segmentation map covered by the block to |segment_id|.
+  // The block is located at |row4x4|, |column4x4| and has dimensions
+  // |block_width4x4| and |block_height4x4|.
+  void FillBlock(int row4x4, int column4x4, int block_width4x4,
+                 int block_height4x4, int8_t segment_id);
+
+ private:
+  int32_t rows4x4_ = 0;
+  int32_t columns4x4_ = 0;
+
+  // segment_id_ is a rows4x4_ by columns4x4_ 2D array. The underlying data
+  // buffer is dynamically allocated and owned by segment_id_buffer_.
+  std::unique_ptr<int8_t[]> segment_id_buffer_;
+  Array2DView<int8_t> segment_id_;
+};
+
+}  // namespace libgav1
+
+#endif  // LIBGAV1_SRC_UTILS_SEGMENTATION_MAP_H_