1 /* 2 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved. 3 * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies) 4 * Copyright (C) 2007 Alp Toker <alp (at) atoker.com> 5 * Copyright (C) 2008 Eric Seidel <eric (at) webkit.org> 6 * Copyright (C) 2008 Dirk Schulze <krit (at) webkit.org> 7 * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved. 8 * Copyright (C) 2012 Intel Corporation. All rights reserved. 9 * Copyright (C) 2012, 2013 Adobe Systems Incorporated. All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY 22 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE 25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 26 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 28 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 30 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 31 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include "config.h" 36 #include "core/html/canvas/CanvasPathMethods.h" 37 38 #include "bindings/v8/ExceptionState.h" 39 #include "core/dom/ExceptionCode.h" 40 #include "core/platform/graphics/FloatRect.h" 41 #include "wtf/MathExtras.h" 42 43 namespace WebCore { 44 45 void CanvasPathMethods::closePath() 46 { 47 if (m_path.isEmpty()) 48 return; 49 50 FloatRect boundRect = m_path.boundingRect(); 51 if (boundRect.width() || boundRect.height()) 52 m_path.closeSubpath(); 53 } 54 55 void CanvasPathMethods::moveTo(float x, float y) 56 { 57 if (!std::isfinite(x) || !std::isfinite(y)) 58 return; 59 if (!isTransformInvertible()) 60 return; 61 m_path.moveTo(FloatPoint(x, y)); 62 } 63 64 void CanvasPathMethods::lineTo(float x, float y) 65 { 66 if (!std::isfinite(x) || !std::isfinite(y)) 67 return; 68 if (!isTransformInvertible()) 69 return; 70 71 FloatPoint p1 = FloatPoint(x, y); 72 if (!m_path.hasCurrentPoint()) 73 m_path.moveTo(p1); 74 else if (p1 != m_path.currentPoint()) 75 m_path.addLineTo(p1); 76 } 77 78 void CanvasPathMethods::quadraticCurveTo(float cpx, float cpy, float x, float y) 79 { 80 if (!std::isfinite(cpx) || !std::isfinite(cpy) || !std::isfinite(x) || !std::isfinite(y)) 81 return; 82 if (!isTransformInvertible()) 83 return; 84 if (!m_path.hasCurrentPoint()) 85 m_path.moveTo(FloatPoint(cpx, cpy)); 86 87 FloatPoint p1 = FloatPoint(x, y); 88 FloatPoint cp = FloatPoint(cpx, cpy); 89 if (p1 != m_path.currentPoint() || p1 != cp) 90 m_path.addQuadCurveTo(cp, p1); 91 } 92 93 void CanvasPathMethods::bezierCurveTo(float cp1x, float cp1y, float cp2x, float cp2y, float x, float y) 94 { 95 if (!std::isfinite(cp1x) || !std::isfinite(cp1y) || !std::isfinite(cp2x) || !std::isfinite(cp2y) || !std::isfinite(x) || !std::isfinite(y)) 96 return; 97 if (!isTransformInvertible()) 98 return; 99 if (!m_path.hasCurrentPoint()) 100 m_path.moveTo(FloatPoint(cp1x, cp1y)); 101 102 FloatPoint p1 = FloatPoint(x, y); 103 FloatPoint cp1 = FloatPoint(cp1x, cp1y); 104 FloatPoint cp2 = FloatPoint(cp2x, cp2y); 105 if (p1 != m_path.currentPoint() || p1 != cp1 || p1 != cp2) 106 m_path.addBezierCurveTo(cp1, cp2, p1); 107 } 108 109 void CanvasPathMethods::arcTo(float x1, float y1, float x2, float y2, float r, ExceptionState& es) 110 { 111 if (!std::isfinite(x1) || !std::isfinite(y1) || !std::isfinite(x2) || !std::isfinite(y2) || !std::isfinite(r)) 112 return; 113 114 if (r < 0) { 115 es.throwDOMException(IndexSizeError); 116 return; 117 } 118 119 if (!isTransformInvertible()) 120 return; 121 122 FloatPoint p1 = FloatPoint(x1, y1); 123 FloatPoint p2 = FloatPoint(x2, y2); 124 125 if (!m_path.hasCurrentPoint()) 126 m_path.moveTo(p1); 127 else if (p1 == m_path.currentPoint() || p1 == p2 || !r) 128 lineTo(x1, y1); 129 else 130 m_path.addArcTo(p1, p2, r); 131 } 132 133 void CanvasPathMethods::arc(float x, float y, float r, float sa, float ea, bool anticlockwise, ExceptionState& es) 134 { 135 if (!std::isfinite(x) || !std::isfinite(y) || !std::isfinite(r) || !std::isfinite(sa) || !std::isfinite(ea)) 136 return; 137 138 if (r < 0) { 139 es.throwDOMException(IndexSizeError); 140 return; 141 } 142 143 if (!r || sa == ea) { 144 // The arc is empty but we still need to draw the connecting line. 145 lineTo(x + r * cosf(sa), y + r * sinf(sa)); 146 return; 147 } 148 149 if (!isTransformInvertible()) 150 return; 151 152 // If 'sa' and 'ea' differ by more than 2Pi, just add a circle starting/ending at 'sa'. 153 if (anticlockwise && sa - ea >= 2 * piFloat) { 154 m_path.addArc(FloatPoint(x, y), r, sa, sa - 2 * piFloat, anticlockwise); 155 return; 156 } 157 if (!anticlockwise && ea - sa >= 2 * piFloat) { 158 m_path.addArc(FloatPoint(x, y), r, sa, sa + 2 * piFloat, anticlockwise); 159 return; 160 } 161 162 m_path.addArc(FloatPoint(x, y), r, sa, ea, anticlockwise); 163 } 164 165 void CanvasPathMethods::rect(float x, float y, float width, float height) 166 { 167 if (!isTransformInvertible()) 168 return; 169 170 if (!std::isfinite(x) || !std::isfinite(y) || !std::isfinite(width) || !std::isfinite(height)) 171 return; 172 173 if (!width && !height) { 174 m_path.moveTo(FloatPoint(x, y)); 175 return; 176 } 177 178 m_path.addRect(FloatRect(x, y, width, height)); 179 } 180 } 181
