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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_BLOCK_PARAMETERS_HOLDER_H_
#define LIBGAV1_SRC_UTILS_BLOCK_PARAMETERS_HOLDER_H_
#include <atomic>
#include <memory>
#include "src/utils/array_2d.h"
#include "src/utils/compiler_attributes.h"
#include "src/utils/constants.h"
#include "src/utils/dynamic_buffer.h"
#include "src/utils/types.h"
namespace libgav1 {
// Holds the BlockParameters pointers to each 4x4 block in the frame.
class BlockParametersHolder {
public:
BlockParametersHolder() = default;
// Not copyable or movable.
BlockParametersHolder(const BlockParametersHolder&) = delete;
BlockParametersHolder& operator=(const BlockParametersHolder&) = delete;
LIBGAV1_MUST_USE_RESULT bool Reset(int rows4x4, int columns4x4);
// Returns a pointer to a BlockParameters object that can be used safely until
// the next call to Reset(). Returns nullptr on memory allocation failure. It
// also fills the cache matrix for the block starting at |row4x4|, |column4x4|
// of size |block_size| with the returned pointer.
BlockParameters* Get(int row4x4, int column4x4, BlockSize block_size);
// Finds the BlockParameters corresponding to |row4x4| and |column4x4|. This
// is done as a simple look up of the |block_parameters_cache_| matrix.
// Returns nullptr if the BlockParameters cannot be found.
BlockParameters* Find(int row4x4, int column4x4) const {
return block_parameters_cache_[row4x4][column4x4];
}
BlockParameters** Address(int row4x4, int column4x4) {
return block_parameters_cache_.data() + row4x4 * columns4x4_ + column4x4;
}
BlockParameters* const* Address(int row4x4, int column4x4) const {
return block_parameters_cache_.data() + row4x4 * columns4x4_ + column4x4;
}
int columns4x4() const { return columns4x4_; }
private:
// Needs access to FillCache for testing Cdef.
template <int bitdepth, typename Pixel>
friend class PostFilterApplyCdefTest;
void FillCache(int row4x4, int column4x4, BlockSize block_size,
BlockParameters* bp);
int rows4x4_ = 0;
int columns4x4_ = 0;
// Owns the memory of BlockParameters pointers for the entire frame. It can
// hold upto |rows4x4_| * |columns4x4_| objects. Each object will be allocated
// on demand and re-used across frames.
DynamicBuffer<std::unique_ptr<BlockParameters>> block_parameters_;
// Points to the next available index of |block_parameters_|.
std::atomic<int> index_;
// This is a 2d array of size |rows4x4_| * |columns4x4_|. This is filled in by
// FillCache() and used by Find() to perform look ups using exactly one look
// up (instead of traversing the entire tree).
Array2D<BlockParameters*> block_parameters_cache_;
};
} // namespace libgav1
#endif // LIBGAV1_SRC_UTILS_BLOCK_PARAMETERS_HOLDER_H_
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