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
33namespace WebCore {
34
35static 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
45SVGElement* 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
56SVGElement* 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
67FloatRect 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
80AffineTransform 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
107AffineTransform 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