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Due to the lack of an analytical solution for Bezier curves offsetting, a simple and computationally cheap approximation has been implemented. The algorithm shifts the segments connecting control points and determines new points based on their intersections. @issue: https://github.com/thorvg/thorvg/issues/2230
71 lines
No EOL
3.1 KiB
C++
71 lines
No EOL
3.1 KiB
C++
/*
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* Copyright (c) 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_MODIFIER_H_
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#define _TVG_LOTTIE_MODIFIER_H_
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#include "tvgCommon.h"
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#include "tvgArray.h"
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#include "tvgMath.h"
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struct LottieRoundnessModifier
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{
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static constexpr float ROUNDNESS_EPSILON = 1.0f;
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float r;
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LottieRoundnessModifier(float r) : r(r) {};
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bool modifyPath(const PathCommand* inCmds, uint32_t inCmdsCnt, const Point* inPts, uint32_t inPtsCnt, Array<PathCommand>& outCmds, Array<Point>& outPts, Matrix* transform) const;
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bool modifyPolystar(const Array<PathCommand>& inCmds, const Array<Point>& inPts, Array<PathCommand>& outCmds, Array<Point>& outPts, float outerRoundness, bool hasRoundness) const;
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bool modifyRect(const Point& size, float& r) const;
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};
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struct LottieOffsetModifier
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{
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float offset;
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float miterLimit;
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StrokeJoin join;
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LottieOffsetModifier(float offset, float miter, StrokeJoin join) : offset(offset), miterLimit(miter), join(join) {};
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bool modifyPath(const PathCommand* inCmds, uint32_t inCmdsCnt, const Point* inPts, uint32_t inPtsCnt, Array<PathCommand>& outCmds, Array<Point>& outPts, bool clockwise) const;
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bool modifyPolystar(const Array<PathCommand>& inCmds, const Array<Point>& inPts, Array<PathCommand>& outCmds, Array<Point>& outPts, bool clockwise) const;
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bool modifyRect(const PathCommand* inCmds, uint32_t inCmdsCnt, const Point* inPts, uint32_t inPtsCnt, Array<PathCommand>& outCmds, Array<Point>& outPts, bool clockwise) const;
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bool modifyEllipse(float& rx, float& ry) const;
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private:
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struct State
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{
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Line line{};
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Line firstLine{};
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bool moveto = false;
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uint32_t movetoOutIndex = 0;
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uint32_t movetoInIndex = 0;
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};
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void line(const PathCommand* inCmds, uint32_t inCmdsCnt, const Point* inPts, uint32_t& currentPt, uint32_t currentCmd, State& state, bool degenerated, Array<PathCommand>& cmds, Array<Point>& pts, float offset) const;
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void corner(const Line& line, const Line& nextLine, uint32_t movetoIndex, bool nextClose, Array<PathCommand>& cmds, Array<Point>& pts) const;
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};
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#endif |