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// Copyright 2014 Google Inc. All Rights Reserved.
//
// 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.
// map.h: a minimalist view-existing-buffer-as-a-matrix class,
// which is how gemmlowp interfaces with external matrix data.
#ifndef GEMMLOWP_PUBLIC_MAP_H_
#define GEMMLOWP_PUBLIC_MAP_H_
#include "internal/common.h"
namespace gemmlowp {
// The two storage orders allowed to map buffers as matrices: ColMajor
// means column-major, RowMajor means row-major.
enum class MapOrder { ColMajor, RowMajor };
// A MatrixMap is a view of an existing buffer as a matrix. It does not own
// the buffer.
template <typename tScalar, MapOrder tOrder>
class MatrixMap {
public:
typedef tScalar Scalar;
static const MapOrder kOrder = tOrder;
protected:
Scalar* data_; // not owned.
int rows_, cols_, stride_;
public:
MatrixMap(Scalar* data, int rows, int cols, int stride)
: data_(data), rows_(rows), cols_(cols), stride_(stride) {}
MatrixMap(const MatrixMap& other)
: data_(other.data_),
rows_(other.rows_),
cols_(other.cols_),
stride_(other.stride_) {}
int rows() const { return rows_; }
int cols() const { return cols_; }
int stride() const { return stride_; }
int rows_stride() const { return kOrder == MapOrder::ColMajor ? 1 : stride_; }
int cols_stride() const { return kOrder == MapOrder::RowMajor ? 1 : stride_; }
Scalar* data() const { return data_; }
Scalar* data(int row, int col) const {
return data_ + row * rows_stride() + col * cols_stride();
}
Scalar operator()(int row, int col) const { return *data(row, col); }
Scalar& operator()(int row, int col) { return *data(row, col); }
MatrixMap block(int start_row, int start_col, int block_rows,
int block_cols) const {
assert(start_row >= 0);
assert(start_row + block_rows <= rows_);
assert(start_col >= 0);
assert(start_col + block_cols <= cols_);
return MatrixMap(data(start_row, start_col), block_rows, block_cols,
stride_);
}
};
} // namespace gemmlowp
#endif // GEMMLOWP_PUBLIC_MAP_H_
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