15abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick/* 25abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * Copyright (C) 2010 Google Inc. All rights reserved. 35abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * 45abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * Redistribution and use in source and binary forms, with or without 55abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * modification, are permitted provided that the following conditions 65abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * are met: 75abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * 85abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * 1. Redistributions of source code must retain the above copyright 95abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * notice, this list of conditions and the following disclaimer. 105abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * 2. Redistributions in binary form must reproduce the above copyright 115abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * notice, this list of conditions and the following disclaimer in the 125abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * documentation and/or other materials provided with the distribution. 135abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * 145abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 155abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 165abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 175abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 185abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 195abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 205abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 215abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 225abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 235abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 245abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick */ 255abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 265abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick// Cubic curve classification algorithm from "Rendering Vector Art on 275abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick// the GPU" by Loop and Blinn, GPU Gems 3, Chapter 25: 285abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick// http://http.developer.nvidia.com/GPUGems3/gpugems3_ch25.html . 295abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 305abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick#ifndef LoopBlinnClassifier_h 315abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick#define LoopBlinnClassifier_h 325abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 3381bc750723a18f21cd17d1b173cd2a4dda9cea6eBen Murdoch#include <wtf/Noncopyable.h> 345abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 355abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merricknamespace WebCore { 365abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 375abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrickclass FloatPoint; 385abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 395abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick// Classifies cubic curves into specific types. 40ab9e7a118cf1ea2e3a93dce683b2ded3e7291ddbBen Murdochclass LoopBlinnClassifier { 41ab9e7a118cf1ea2e3a93dce683b2ded3e7291ddbBen Murdoch WTF_MAKE_NONCOPYABLE(LoopBlinnClassifier); 425abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrickpublic: 435abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick // The types of cubic curves. 445abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick enum CurveType { 455abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick kSerpentine, 465abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick kCusp, 475abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick kLoop, 485abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick kQuadratic, 495abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick kLine, 505abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick kPoint 515abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick }; 525abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 535abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick // The result of the classifier. 545abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick struct Result { 555abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick public: 565abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick Result(CurveType inputCurveType, float inputD1, float inputD2, float inputD3) 575abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick : curveType(inputCurveType) 585abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick , d1(inputD1) 595abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick , d2(inputD2) 605abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick , d3(inputD3) { } 615abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 625abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick CurveType curveType; 635abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 645abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick // These are coefficients used later in the computation of 655abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick // texture coordinates per vertex. 665abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick float d1; 675abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick float d2; 685abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick float d3; 695abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick }; 705abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 715abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick // Classifies the given cubic bezier curve starting at c0, ending 725abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick // at c3, and affected by control points c1 and c2. 735abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick static Result classify(const FloatPoint& c0, 745abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick const FloatPoint& c1, 755abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick const FloatPoint& c2, 765abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick const FloatPoint& c3); 775abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 785abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrickprivate: 795abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick // This class does not need to be instantiated. 805abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick LoopBlinnClassifier() { } 815abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick}; 825abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 835abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick} // namespace WebCore 845abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick 855abb8606fa57c3ebfc8b3c3dbc3fa4a25d2ae306Iain Merrick#endif // LoopBlinnClassifier_h 86