24 lines
598 B
C++
24 lines
598 B
C++
// Copyright (c) the JPEG XL Project Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#ifndef LIB_JXL_LINALG_H_
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#define LIB_JXL_LINALG_H_
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// Linear algebra.
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#include <array>
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namespace jxl {
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typedef std::array<double, 2> Vector2;
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// NB: matrix2x2[row][column]
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typedef std::array<Vector2, 2> Matrix2x2;
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// A is symmetric, U is orthogonal, and A = U * Diagonal(diag) * Transpose(U).
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void ConvertToDiagonal(const Matrix2x2& A, Vector2& diag, Matrix2x2& U);
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} // namespace jxl
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#endif // LIB_JXL_LINALG_H_
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