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@atoker.com>
5 * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
6 * Copyright (C) 2008 Dirk Schulze <krit@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 "CanvasPath.h"
37
38#include "AffineTransform.h"
39#include "FloatRect.h"
40#include <wtf/MathExtras.h>
41
42namespace WebCore {
43
44void CanvasPath::closePath()
45{
46 if (m_path.isEmpty())
47 return;
48
49 FloatRect boundRect = m_path.fastBoundingRect();
50 if (boundRect.width() || boundRect.height())
51 m_path.closeSubpath();
52}
53
54void CanvasPath::moveTo(float x, float y)
55{
56 if (!std::isfinite(x) || !std::isfinite(y))
57 return;
58 if (!hasInvertibleTransform())
59 return;
60 m_path.moveTo(FloatPoint(x, y));
61}
62
63void CanvasPath::lineTo(FloatPoint point)
64{
65 lineTo(point.x(), point.y());
66}
67
68void CanvasPath::lineTo(float x, float y)
69{
70 if (!std::isfinite(x) || !std::isfinite(y))
71 return;
72 if (!hasInvertibleTransform())
73 return;
74
75 FloatPoint p1 = FloatPoint(x, y);
76 if (!m_path.hasCurrentPoint())
77 m_path.moveTo(p1);
78 else if (p1 != m_path.currentPoint())
79 m_path.addLineTo(p1);
80}
81
82void CanvasPath::quadraticCurveTo(float cpx, float cpy, float x, float y)
83{
84 if (!std::isfinite(cpx) || !std::isfinite(cpy) || !std::isfinite(x) || !std::isfinite(y))
85 return;
86 if (!hasInvertibleTransform())
87 return;
88 if (!m_path.hasCurrentPoint())
89 m_path.moveTo(FloatPoint(cpx, cpy));
90
91 FloatPoint p1 = FloatPoint(x, y);
92 FloatPoint cp = FloatPoint(cpx, cpy);
93 if (p1 != m_path.currentPoint() || p1 != cp)
94 m_path.addQuadCurveTo(cp, p1);
95}
96
97void CanvasPath::bezierCurveTo(float cp1x, float cp1y, float cp2x, float cp2y, float x, float y)
98{
99 if (!std::isfinite(cp1x) || !std::isfinite(cp1y) || !std::isfinite(cp2x) || !std::isfinite(cp2y) || !std::isfinite(x) || !std::isfinite(y))
100 return;
101 if (!hasInvertibleTransform())
102 return;
103 if (!m_path.hasCurrentPoint())
104 m_path.moveTo(FloatPoint(cp1x, cp1y));
105
106 FloatPoint p1 = FloatPoint(x, y);
107 FloatPoint cp1 = FloatPoint(cp1x, cp1y);
108 FloatPoint cp2 = FloatPoint(cp2x, cp2y);
109 if (p1 != m_path.currentPoint() || p1 != cp1 || p1 != cp2)
110 m_path.addBezierCurveTo(cp1, cp2, p1);
111}
112
113ExceptionOr<void> CanvasPath::arcTo(float x1, float y1, float x2, float y2, float r)
114{
115 if (!std::isfinite(x1) || !std::isfinite(y1) || !std::isfinite(x2) || !std::isfinite(y2) || !std::isfinite(r))
116 return { };
117
118 if (r < 0)
119 return Exception { IndexSizeError };
120
121 if (!hasInvertibleTransform())
122 return { };
123
124 FloatPoint p1 = FloatPoint(x1, y1);
125 FloatPoint p2 = FloatPoint(x2, y2);
126
127 if (!m_path.hasCurrentPoint())
128 m_path.moveTo(p1);
129 else if (p1 == m_path.currentPoint() || p1 == p2 || !r)
130 lineTo(x1, y1);
131 else
132 m_path.addArcTo(p1, p2, r);
133
134 return { };
135}
136
137static void normalizeAngles(float& startAngle, float& endAngle, bool anticlockwise)
138{
139 float newStartAngle = startAngle;
140 if (newStartAngle < 0)
141 newStartAngle = (2 * piFloat) + fmodf(newStartAngle, -(2 * piFloat));
142 else
143 newStartAngle = fmodf(newStartAngle, 2 * piFloat);
144
145 float delta = newStartAngle - startAngle;
146 startAngle = newStartAngle;
147 endAngle = endAngle + delta;
148 ASSERT(newStartAngle >= 0 && newStartAngle < 2 * piFloat);
149
150 if (anticlockwise && startAngle - endAngle >= 2 * piFloat)
151 endAngle = startAngle - 2 * piFloat;
152 else if (!anticlockwise && endAngle - startAngle >= 2 * piFloat)
153 endAngle = startAngle + 2 * piFloat;
154}
155
156ExceptionOr<void> CanvasPath::arc(float x, float y, float radius, float startAngle, float endAngle, bool anticlockwise)
157{
158 if (!std::isfinite(x) || !std::isfinite(y) || !std::isfinite(radius) || !std::isfinite(startAngle) || !std::isfinite(endAngle))
159 return { };
160
161 if (radius < 0)
162 return Exception { IndexSizeError };
163
164 if (!hasInvertibleTransform())
165 return { };
166
167 normalizeAngles(startAngle, endAngle, anticlockwise);
168
169 if (!radius || startAngle == endAngle) {
170 // The arc is empty but we still need to draw the connecting line.
171 lineTo(x + radius * cosf(startAngle), y + radius * sinf(startAngle));
172 return { };
173 }
174
175 m_path.addArc(FloatPoint(x, y), radius, startAngle, endAngle, anticlockwise);
176 return { };
177}
178
179ExceptionOr<void> CanvasPath::ellipse(float x, float y, float radiusX, float radiusY, float rotation, float startAngle, float endAngle, bool anticlockwise)
180{
181 if (!std::isfinite(x) || !std::isfinite(y) || !std::isfinite(radiusX) || !std::isfinite(radiusY) || !std::isfinite(rotation) || !std::isfinite(startAngle) || !std::isfinite(endAngle))
182 return { };
183
184 if (radiusX < 0 || radiusY < 0)
185 return Exception { IndexSizeError };
186
187 if (!hasInvertibleTransform())
188 return { };
189
190 normalizeAngles(startAngle, endAngle, anticlockwise);
191
192 if ((!radiusX && !radiusY) || startAngle == endAngle) {
193 AffineTransform transform;
194 transform.translate(x, y).rotate(rad2deg(rotation));
195
196 lineTo(transform.mapPoint(FloatPoint(radiusX * cosf(startAngle), radiusY * sinf(startAngle))));
197 return { };
198 }
199
200 if (!radiusX || !radiusY) {
201 AffineTransform transform;
202 transform.translate(x, y).rotate(rad2deg(rotation));
203
204 lineTo(transform.mapPoint(FloatPoint(radiusX * cosf(startAngle), radiusY * sinf(startAngle))));
205
206 if (!anticlockwise) {
207 for (float angle = startAngle - fmodf(startAngle, piOverTwoFloat) + piOverTwoFloat; angle < endAngle; angle += piOverTwoFloat)
208 lineTo(transform.mapPoint(FloatPoint(radiusX * cosf(angle), radiusY * sinf(angle))));
209 } else {
210 for (float angle = startAngle - fmodf(startAngle, piOverTwoFloat); angle > endAngle; angle -= piOverTwoFloat)
211 lineTo(transform.mapPoint(FloatPoint(radiusX * cosf(angle), radiusY * sinf(angle))));
212 }
213
214 lineTo(transform.mapPoint(FloatPoint(radiusX * cosf(endAngle), radiusY * sinf(endAngle))));
215 return { };
216 }
217
218 m_path.addEllipse(FloatPoint(x, y), radiusX, radiusY, rotation, startAngle, endAngle, anticlockwise);
219 return { };
220}
221
222void CanvasPath::rect(float x, float y, float width, float height)
223{
224 if (!hasInvertibleTransform())
225 return;
226
227 if (!std::isfinite(x) || !std::isfinite(y) || !std::isfinite(width) || !std::isfinite(height))
228 return;
229
230 if (!width && !height) {
231 m_path.moveTo(FloatPoint(x, y));
232 return;
233 }
234
235 m_path.addRect(FloatRect(x, y, width, height));
236}
237
238float CanvasPath::currentX() const
239{
240 return m_path.currentPoint().x();
241}
242
243float CanvasPath::currentY() const
244{
245 return m_path.currentPoint().y();
246}
247
248}
249