mirror of
https://github.com/openharmony/graphic_ui.git
synced 2026-06-30 23:17:56 -04:00
mamingshuai
36 lines
1.2 KiB
C++
Executable File
36 lines
1.2 KiB
C++
Executable File
/*
|
|
* Copyright (c) 2020-2021 Huawei Device Co., Ltd.
|
|
* 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 "animator/interpolation.h"
|
|
|
|
namespace OHOS {
|
|
/* B(t) = P0*(1-t)^3 + 3*P1*t*(1-t)^2 + 3*P2*t^2*(1-t) + P3*t^3 */
|
|
int16_t Interpolation::GetBezierInterpolation(int16_t t, int16_t u0, int16_t u1, int16_t u2, int16_t u3)
|
|
{
|
|
int64_t invT = INTERPOLATION_RANGE - t;
|
|
int64_t invT2 = invT * invT;
|
|
int64_t invT3 = invT2 * invT;
|
|
int64_t t2 = t * t;
|
|
int64_t t3 = t2 * t;
|
|
|
|
int64_t ret = invT3 * u0;
|
|
ret += BESSEL_COEFFICIENT * invT2 * t * u1;
|
|
ret += BESSEL_COEFFICIENT * invT * t2 * u2;
|
|
ret += t3 * u3;
|
|
ret = ret >> CUBIC_BEZIER_CALCULATE_OFFSET;
|
|
return static_cast<int16_t>(ret);
|
|
}
|
|
}
|