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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.
#include "src/utils/block_parameters_holder.h"
#include <algorithm>
#include "src/utils/common.h"
#include "src/utils/constants.h"
#include "src/utils/logging.h"
#include "src/utils/types.h"
namespace libgav1 {
bool BlockParametersHolder::Reset(int rows4x4, int columns4x4) {
rows4x4_ = rows4x4;
columns4x4_ = columns4x4;
index_ = 0;
return block_parameters_cache_.Reset(rows4x4_, columns4x4_) &&
block_parameters_.Resize(rows4x4_ * columns4x4_);
}
BlockParameters* BlockParametersHolder::Get(int row4x4, int column4x4,
BlockSize block_size) {
const size_t index = index_.fetch_add(1, std::memory_order_relaxed);
if (index >= block_parameters_.size()) return nullptr;
auto& bp = block_parameters_.get()[index];
if (bp == nullptr) {
bp.reset(new (std::nothrow) BlockParameters);
if (bp == nullptr) return nullptr;
}
FillCache(row4x4, column4x4, block_size, bp.get());
return bp.get();
}
void BlockParametersHolder::FillCache(int row4x4, int column4x4,
BlockSize block_size,
BlockParameters* const bp) {
int rows = std::min(static_cast<int>(kNum4x4BlocksHigh[block_size]),
rows4x4_ - row4x4);
const int columns = std::min(static_cast<int>(kNum4x4BlocksWide[block_size]),
columns4x4_ - column4x4);
auto* bp_dst = &block_parameters_cache_[row4x4][column4x4];
// Specialize columns cases (values in kNum4x4BlocksWide[]) for better
// performance.
if (columns == 1) {
SetBlock<BlockParameters*>(rows, 1, bp, bp_dst, columns4x4_);
} else if (columns == 2) {
SetBlock<BlockParameters*>(rows, 2, bp, bp_dst, columns4x4_);
} else if (columns == 4) {
SetBlock<BlockParameters*>(rows, 4, bp, bp_dst, columns4x4_);
} else if (columns == 8) {
SetBlock<BlockParameters*>(rows, 8, bp, bp_dst, columns4x4_);
} else if (columns == 16) {
SetBlock<BlockParameters*>(rows, 16, bp, bp_dst, columns4x4_);
} else if (columns == 32) {
SetBlock<BlockParameters*>(rows, 32, bp, bp_dst, columns4x4_);
} else {
do {
// The following loop has better performance than using std::fill().
// std::fill() has some overhead in checking zero loop count.
int x = columns;
auto* d = bp_dst;
do {
*d++ = bp;
} while (--x != 0);
bp_dst += columns4x4_;
} while (--rows != 0);
}
}
} // namespace libgav1
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