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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