1cb93a386Sopenharmony_ci/*
2cb93a386Sopenharmony_ci * Copyright 2021 Google LLC
3cb93a386Sopenharmony_ci *
4cb93a386Sopenharmony_ci * Use of this source code is governed by a BSD-style license that can be
5cb93a386Sopenharmony_ci * found in the LICENSE file.
6cb93a386Sopenharmony_ci */
7cb93a386Sopenharmony_ci
8cb93a386Sopenharmony_ci#ifndef SkMatrixInvert_DEFINED
9cb93a386Sopenharmony_ci#define SkMatrixInvert_DEFINED
10cb93a386Sopenharmony_ci
11cb93a386Sopenharmony_ci#include "include/core/SkScalar.h"
12cb93a386Sopenharmony_ci
13cb93a386Sopenharmony_ci/**
14cb93a386Sopenharmony_ci * Computes the inverse of `inMatrix`, passed in column-major order.
15cb93a386Sopenharmony_ci * `inMatrix` and `outMatrix` are allowed to point to the same array of scalars in memory.
16cb93a386Sopenharmony_ci * `outMatrix` is allowed to be null.
17cb93a386Sopenharmony_ci * The return value is the determinant of the input matrix. If zero is returned, the matrix was
18cb93a386Sopenharmony_ci * non-invertible, and `outMatrix` has been left in an indeterminate state.
19cb93a386Sopenharmony_ci */
20cb93a386Sopenharmony_ciSkScalar SkInvert2x2Matrix(const SkScalar inMatrix[4], SkScalar outMatrix[4]);
21cb93a386Sopenharmony_ciSkScalar SkInvert3x3Matrix(const SkScalar inMatrix[9], SkScalar outMatrix[9]);
22cb93a386Sopenharmony_ciSkScalar SkInvert4x4Matrix(const SkScalar inMatrix[16], SkScalar outMatrix[16]);
23cb93a386Sopenharmony_ci
24cb93a386Sopenharmony_ci#endif
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