2 * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
22 #include "SVGTransformDistance.h"
24 #include "FloatConversion.h"
25 #include "FloatPoint.h"
26 #include "FloatSize.h"
27 #include "SVGTransform.h"
33 SVGTransformDistance::SVGTransformDistance()
34 : m_type(SVGTransform::SVG_TRANSFORM_UNKNOWN)
41 SVGTransformDistance::SVGTransformDistance(SVGTransform::SVGTransformType type, float angle, float cx, float cy, const AffineTransform& transform)
46 , m_transform(transform)
50 SVGTransformDistance::SVGTransformDistance(const SVGTransform& fromSVGTransform, const SVGTransform& toSVGTransform)
51 : m_type(fromSVGTransform.type())
56 ASSERT(m_type == toSVGTransform.type());
59 case SVGTransform::SVG_TRANSFORM_MATRIX:
61 case SVGTransform::SVG_TRANSFORM_UNKNOWN:
63 case SVGTransform::SVG_TRANSFORM_ROTATE: {
64 FloatSize centerDistance = toSVGTransform.rotationCenter() - fromSVGTransform.rotationCenter();
65 m_angle = toSVGTransform.angle() - fromSVGTransform.angle();
66 m_cx = centerDistance.width();
67 m_cy = centerDistance.height();
70 case SVGTransform::SVG_TRANSFORM_TRANSLATE: {
71 FloatSize translationDistance = toSVGTransform.translate() - fromSVGTransform.translate();
72 m_transform.translate(translationDistance.width(), translationDistance.height());
75 case SVGTransform::SVG_TRANSFORM_SCALE: {
76 float scaleX = toSVGTransform.scale().width() - fromSVGTransform.scale().width();
77 float scaleY = toSVGTransform.scale().height() - fromSVGTransform.scale().height();
78 m_transform.scaleNonUniform(scaleX, scaleY);
81 case SVGTransform::SVG_TRANSFORM_SKEWX:
82 case SVGTransform::SVG_TRANSFORM_SKEWY:
83 m_angle = toSVGTransform.angle() - fromSVGTransform.angle();
88 SVGTransformDistance SVGTransformDistance::scaledDistance(float scaleFactor) const
91 case SVGTransform::SVG_TRANSFORM_MATRIX:
93 case SVGTransform::SVG_TRANSFORM_UNKNOWN:
94 return SVGTransformDistance();
95 case SVGTransform::SVG_TRANSFORM_ROTATE:
96 return SVGTransformDistance(m_type, m_angle * scaleFactor, m_cx * scaleFactor, m_cy * scaleFactor, AffineTransform());
97 case SVGTransform::SVG_TRANSFORM_SCALE:
98 return SVGTransformDistance(m_type, m_angle * scaleFactor, m_cx * scaleFactor, m_cy * scaleFactor, AffineTransform(m_transform).scale(scaleFactor));
99 case SVGTransform::SVG_TRANSFORM_TRANSLATE: {
100 AffineTransform newTransform(m_transform);
101 newTransform.setE(m_transform.e() * scaleFactor);
102 newTransform.setF(m_transform.f() * scaleFactor);
103 return SVGTransformDistance(m_type, 0, 0, 0, newTransform);
105 case SVGTransform::SVG_TRANSFORM_SKEWX:
106 case SVGTransform::SVG_TRANSFORM_SKEWY:
107 return SVGTransformDistance(m_type, m_angle * scaleFactor, m_cx * scaleFactor, m_cy * scaleFactor, AffineTransform());
110 ASSERT_NOT_REACHED();
111 return SVGTransformDistance();
114 SVGTransform SVGTransformDistance::addSVGTransforms(const SVGTransform& first, const SVGTransform& second, unsigned repeatCount)
116 ASSERT(first.type() == second.type());
118 SVGTransform transform;
120 switch (first.type()) {
121 case SVGTransform::SVG_TRANSFORM_MATRIX:
122 ASSERT_NOT_REACHED();
123 case SVGTransform::SVG_TRANSFORM_UNKNOWN:
124 return SVGTransform();
125 case SVGTransform::SVG_TRANSFORM_ROTATE: {
126 transform.setRotate(first.angle() + second.angle() * repeatCount, first.rotationCenter().x() + second.rotationCenter().x() * repeatCount, first.rotationCenter().y() + second.rotationCenter().y() * repeatCount);
129 case SVGTransform::SVG_TRANSFORM_TRANSLATE: {
130 float dx = first.translate().x() + second.translate().x() * repeatCount;
131 float dy = first.translate().y() + second.translate().y() * repeatCount;
132 transform.setTranslate(dx, dy);
135 case SVGTransform::SVG_TRANSFORM_SCALE: {
136 FloatSize scale = second.scale();
137 scale.scale(repeatCount);
138 scale += first.scale();
139 transform.setScale(scale.width(), scale.height());
142 case SVGTransform::SVG_TRANSFORM_SKEWX:
143 transform.setSkewX(first.angle() + second.angle() * repeatCount);
145 case SVGTransform::SVG_TRANSFORM_SKEWY:
146 transform.setSkewY(first.angle() + second.angle() * repeatCount);
149 ASSERT_NOT_REACHED();
150 return SVGTransform();
153 SVGTransform SVGTransformDistance::addToSVGTransform(const SVGTransform& transform) const
155 ASSERT(m_type == transform.type() || transform == SVGTransform());
157 SVGTransform newTransform(transform);
160 case SVGTransform::SVG_TRANSFORM_MATRIX:
161 ASSERT_NOT_REACHED();
162 case SVGTransform::SVG_TRANSFORM_UNKNOWN:
163 return SVGTransform();
164 case SVGTransform::SVG_TRANSFORM_TRANSLATE: {
165 FloatPoint translation = transform.translate();
166 translation += FloatSize::narrowPrecision(m_transform.e(), m_transform.f());
167 newTransform.setTranslate(translation.x(), translation.y());
170 case SVGTransform::SVG_TRANSFORM_SCALE: {
171 FloatSize scale = transform.scale();
172 scale += FloatSize::narrowPrecision(m_transform.a(), m_transform.d());
173 newTransform.setScale(scale.width(), scale.height());
176 case SVGTransform::SVG_TRANSFORM_ROTATE: {
177 FloatPoint center = transform.rotationCenter();
178 newTransform.setRotate(transform.angle() + m_angle, center.x() + m_cx, center.y() + m_cy);
181 case SVGTransform::SVG_TRANSFORM_SKEWX:
182 newTransform.setSkewX(transform.angle() + m_angle);
184 case SVGTransform::SVG_TRANSFORM_SKEWY:
185 newTransform.setSkewY(transform.angle() + m_angle);
189 ASSERT_NOT_REACHED();
190 return SVGTransform();
193 bool SVGTransformDistance::isZero() const
195 return m_transform.isIdentity() && !m_angle;
198 float SVGTransformDistance::distance() const
201 case SVGTransform::SVG_TRANSFORM_MATRIX:
202 ASSERT_NOT_REACHED();
203 case SVGTransform::SVG_TRANSFORM_UNKNOWN:
205 case SVGTransform::SVG_TRANSFORM_ROTATE:
206 return sqrtf(m_angle * m_angle + m_cx * m_cx + m_cy * m_cy);
207 case SVGTransform::SVG_TRANSFORM_SCALE:
208 return static_cast<float>(sqrt(m_transform.a() * m_transform.a() + m_transform.d() * m_transform.d()));
209 case SVGTransform::SVG_TRANSFORM_TRANSLATE:
210 return static_cast<float>(sqrt(m_transform.e() * m_transform.e() + m_transform.f() * m_transform.f()));
211 case SVGTransform::SVG_TRANSFORM_SKEWX:
212 case SVGTransform::SVG_TRANSFORM_SKEWY:
215 ASSERT_NOT_REACHED();