mirror of https://github.com/axmolengine/axmol.git
58 lines
2.4 KiB
C
58 lines
2.4 KiB
C
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/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#ifndef GrPathUtils_DEFINED
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#define GrPathUtils_DEFINED
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#include "GrNoncopyable.h"
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#include "GrPoint.h"
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#include "GrPath.h"
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/**
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* Utilities for evaluating paths.
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*/
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class GrPathUtils : public GrNoncopyable {
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public:
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/// Since we divide by tol if we're computing exact worst-case bounds,
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/// very small tolerances will be increased to gMinCurveTol.
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static int worstCasePointCount(const GrPath&,
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int* subpaths,
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GrScalar tol);
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/// Since we divide by tol if we're computing exact worst-case bounds,
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/// very small tolerances will be increased to gMinCurveTol.
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static uint32_t quadraticPointCount(const GrPoint points[], GrScalar tol);
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static uint32_t generateQuadraticPoints(const GrPoint& p0,
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const GrPoint& p1,
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const GrPoint& p2,
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GrScalar tolSqd,
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GrPoint** points,
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uint32_t pointsLeft);
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/// Since we divide by tol if we're computing exact worst-case bounds,
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/// very small tolerances will be increased to gMinCurveTol.
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static uint32_t cubicPointCount(const GrPoint points[], GrScalar tol);
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static uint32_t generateCubicPoints(const GrPoint& p0,
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const GrPoint& p1,
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const GrPoint& p2,
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const GrPoint& p3,
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GrScalar tolSqd,
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GrPoint** points,
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uint32_t pointsLeft);
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private:
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static const GrScalar gMinCurveTol;
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};
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#endif
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