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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_
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