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* Copyright (C) 2010 Google Inc. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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// Cubic curve classification algorithm from "Rendering Vector Art on
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// the GPU" by Loop and Blinn, GPU Gems 3, Chapter 25:
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// http://http.developer.nvidia.com/GPUGems3/gpugems3_ch25.html .
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#ifndef LoopBlinnClassifier_h
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#define LoopBlinnClassifier_h
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#include <wtf/Noncopyable.h>
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// Classifies cubic curves into specific types.
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class LoopBlinnClassifier {
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WTF_MAKE_NONCOPYABLE(LoopBlinnClassifier);
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// The types of cubic curves.
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// The result of the classifier.
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Result(CurveType inputCurveType, float inputD1, float inputD2, float inputD3)
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: curveType(inputCurveType)
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// These are coefficients used later in the computation of
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// texture coordinates per vertex.
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// Classifies the given cubic bezier curve starting at c0, ending
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// at c3, and affected by control points c1 and c2.
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static Result classify(const FloatPoint& c0,
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const FloatPoint& c3);
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// This class does not need to be instantiated.
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LoopBlinnClassifier() { }
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} // namespace WebCore
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#endif // LoopBlinnClassifier_h