1 /*
2 * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
4 * Copyright (C) 2009 Google, Inc. All rights reserved.
5 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 */
22
23 #include "config.h"
24
25 #if ENABLE(SVG)
26 #include "SVGLocatable.h"
27
28 #include "RenderObject.h"
29 #include "SVGException.h"
30 #include "SVGNames.h"
31 #include "SVGStyledLocatableElement.h"
32
33 namespace WebCore {
34
isViewportElement(Node * node)35 static bool isViewportElement(Node* node)
36 {
37 return (node->hasTagName(SVGNames::svgTag)
38 || node->hasTagName(SVGNames::symbolTag)
39 #if ENABLE(SVG_FOREIGN_OBJECT)
40 || node->hasTagName(SVGNames::foreignObjectTag)
41 #endif
42 || node->hasTagName(SVGNames::imageTag));
43 }
44
nearestViewportElement(const SVGElement * element)45 SVGElement* SVGLocatable::nearestViewportElement(const SVGElement* element)
46 {
47 ASSERT(element);
48 for (ContainerNode* n = element->parentNode(); n; n = n->parentNode()) {
49 if (isViewportElement(n))
50 return static_cast<SVGElement*>(n);
51 }
52
53 return 0;
54 }
55
farthestViewportElement(const SVGElement * element)56 SVGElement* SVGLocatable::farthestViewportElement(const SVGElement* element)
57 {
58 ASSERT(element);
59 SVGElement* farthest = 0;
60 for (ContainerNode* n = element->parentNode(); n; n = n->parentNode()) {
61 if (isViewportElement(n))
62 farthest = static_cast<SVGElement*>(n);
63 }
64 return farthest;
65 }
66
getBBox(const SVGElement * element,StyleUpdateStrategy styleUpdateStrategy)67 FloatRect SVGLocatable::getBBox(const SVGElement* element, StyleUpdateStrategy styleUpdateStrategy)
68 {
69 ASSERT(element);
70 if (styleUpdateStrategy == AllowStyleUpdate)
71 element->document()->updateLayoutIgnorePendingStylesheets();
72
73 // FIXME: Eventually we should support getBBox for detached elements.
74 if (!element->renderer())
75 return FloatRect();
76
77 return element->renderer()->objectBoundingBox();
78 }
79
computeCTM(const SVGElement * element,CTMScope mode,StyleUpdateStrategy styleUpdateStrategy)80 AffineTransform SVGLocatable::computeCTM(const SVGElement* element, CTMScope mode, StyleUpdateStrategy styleUpdateStrategy)
81 {
82 ASSERT(element);
83 if (styleUpdateStrategy == AllowStyleUpdate)
84 element->document()->updateLayoutIgnorePendingStylesheets();
85
86 AffineTransform ctm;
87
88 SVGElement* stopAtElement = mode == NearestViewportScope ? nearestViewportElement(element) : 0;
89
90 Node* current = const_cast<SVGElement*>(element);
91 while (current && current->isSVGElement()) {
92 SVGElement* currentElement = static_cast<SVGElement*>(current);
93 if (currentElement->isStyled())
94 // note that this modifies the AffineTransform returned by localCoordinateSpaceTransform(mode) too.
95 ctm = static_cast<SVGStyledElement*>(currentElement)->localCoordinateSpaceTransform(mode).multiply(ctm);
96
97 // For getCTM() computation, stop at the nearest viewport element
98 if (currentElement == stopAtElement)
99 break;
100
101 current = current->parentOrHostNode();
102 }
103
104 return ctm;
105 }
106
getTransformToElement(SVGElement * target,ExceptionCode & ec,StyleUpdateStrategy styleUpdateStrategy) const107 AffineTransform SVGLocatable::getTransformToElement(SVGElement* target, ExceptionCode& ec, StyleUpdateStrategy styleUpdateStrategy) const
108 {
109 AffineTransform ctm = getCTM(styleUpdateStrategy);
110
111 if (target && target->isStyledLocatable()) {
112 AffineTransform targetCTM = static_cast<SVGStyledLocatableElement*>(target)->getCTM(styleUpdateStrategy);
113 if (!targetCTM.isInvertible()) {
114 ec = SVGException::SVG_MATRIX_NOT_INVERTABLE;
115 return ctm;
116 }
117 ctm = targetCTM.inverse() * ctm;
118 }
119
120 return ctm;
121 }
122
123 }
124
125 #endif // ENABLE(SVG)
126