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45 lines
No EOL
1.7 KiB
C++
45 lines
No EOL
1.7 KiB
C++
/*
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* Copyright (c) 2023 - 2024 the ThorVG project. All rights reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _TVG_LOTTIE_INTERPOLATOR_H_
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#define _TVG_LOTTIE_INTERPOLATOR_H_
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#define SPLINE_TABLE_SIZE 11
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struct LottieInterpolator
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{
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char* key;
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Point outTangent, inTangent;
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float progress(float t);
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void set(const char* key, Point& inTangent, Point& outTangent);
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private:
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static constexpr float SAMPLE_STEP_SIZE = 1.0f / float(SPLINE_TABLE_SIZE - 1);
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float samples[SPLINE_TABLE_SIZE];
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float getTForX(float aX);
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float binarySubdivide(float aX, float aA, float aB);
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float NewtonRaphsonIterate(float aX, float aGuessT);
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};
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#endif //_TVG_LOTTIE_INTERPOLATOR_H_
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