18bf80f4bSopenharmony_ci/* 28bf80f4bSopenharmony_ci * Copyright (c) 2024 Huawei Device Co., Ltd. 38bf80f4bSopenharmony_ci * Licensed under the Apache License, Version 2.0 (the "License"); 48bf80f4bSopenharmony_ci * you may not use this file except in compliance with the License. 58bf80f4bSopenharmony_ci * You may obtain a copy of the License at 68bf80f4bSopenharmony_ci * 78bf80f4bSopenharmony_ci * http://www.apache.org/licenses/LICENSE-2.0 88bf80f4bSopenharmony_ci * 98bf80f4bSopenharmony_ci * Unless required by applicable law or agreed to in writing, software 108bf80f4bSopenharmony_ci * distributed under the License is distributed on an "AS IS" BASIS, 118bf80f4bSopenharmony_ci * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 128bf80f4bSopenharmony_ci * See the License for the specific language governing permissions and 138bf80f4bSopenharmony_ci * limitations under the License. 148bf80f4bSopenharmony_ci */ 158bf80f4bSopenharmony_ci 168bf80f4bSopenharmony_ci#ifndef API_BASE_MATH_SPLINE_H 178bf80f4bSopenharmony_ci#define API_BASE_MATH_SPLINE_H 188bf80f4bSopenharmony_ci 198bf80f4bSopenharmony_ci#include <base/namespace.h> 208bf80f4bSopenharmony_ci 218bf80f4bSopenharmony_ciBASE_BEGIN_NAMESPACE() 228bf80f4bSopenharmony_cinamespace Math { 238bf80f4bSopenharmony_ci/** @ingroup group_math_spline */ 248bf80f4bSopenharmony_ci/** For hermite interpolation */ 258bf80f4bSopenharmony_citemplate<typename T> 268bf80f4bSopenharmony_ciinline constexpr T Hermite(T const& v1, T const& t1, T const& v2, T const& t2, float s) 278bf80f4bSopenharmony_ci{ 288bf80f4bSopenharmony_ci const float s2 = s * s; 298bf80f4bSopenharmony_ci const float s3 = s2 * s; 308bf80f4bSopenharmony_ci const float s23 = 2.f * s3; 318bf80f4bSopenharmony_ci const float s32 = 3.f * s2; 328bf80f4bSopenharmony_ci 338bf80f4bSopenharmony_ci const float f1 = s23 - s32 + 1.f; 348bf80f4bSopenharmony_ci const float f2 = -s23 + s32; 358bf80f4bSopenharmony_ci const float f3 = s3 - 2.f * s2 + s; 368bf80f4bSopenharmony_ci const float f4 = s3 - s2; 378bf80f4bSopenharmony_ci 388bf80f4bSopenharmony_ci return v1 * f1 + v2 * f2 + t1 * f3 + t2 * f4; 398bf80f4bSopenharmony_ci} 408bf80f4bSopenharmony_ci} // namespace Math 418bf80f4bSopenharmony_ciBASE_END_NAMESPACE() 428bf80f4bSopenharmony_ci 438bf80f4bSopenharmony_ci#endif // API_BASE_MATH_SPLINE_H 44