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#include "SVGLocatable.h"
25
26#include "RenderElement.h"
27#include "SVGGraphicsElement.h"
28#include "SVGImageElement.h"
29#include "SVGMatrix.h"
30#include "SVGNames.h"
31
32namespace WebCore {
33
34static bool isViewportElement(Node* node)
35{
36 return (node->hasTagName(SVGNames::svgTag)
37 || node->hasTagName(SVGNames::symbolTag)
38 || node->hasTagName(SVGNames::foreignObjectTag)
39 || is<SVGImageElement>(*node));
40}
41
42SVGElement* SVGLocatable::nearestViewportElement(const SVGElement* element)
43{
44 ASSERT(element);
45 for (Element* current = element->parentOrShadowHostElement(); current; current = current->parentOrShadowHostElement()) {
46 if (isViewportElement(current))
47 return downcast<SVGElement>(current);
48 }
49
50 return nullptr;
51}
52
53SVGElement* SVGLocatable::farthestViewportElement(const SVGElement* element)
54{
55 ASSERT(element);
56 SVGElement* farthest = nullptr;
57 for (Element* current = element->parentOrShadowHostElement(); current; current = current->parentOrShadowHostElement()) {
58 if (isViewportElement(current))
59 farthest = downcast<SVGElement>(current);
60 }
61 return farthest;
62}
63
64FloatRect SVGLocatable::getBBox(SVGElement* element, StyleUpdateStrategy styleUpdateStrategy)
65{
66 ASSERT(element);
67 if (styleUpdateStrategy == AllowStyleUpdate)
68 element->document().updateLayoutIgnorePendingStylesheets();
69
70 // FIXME: Eventually we should support getBBox for detached elements.
71 if (!element->renderer())
72 return FloatRect();
73
74 return element->renderer()->objectBoundingBox();
75}
76
77AffineTransform SVGLocatable::computeCTM(SVGElement* element, CTMScope mode, StyleUpdateStrategy styleUpdateStrategy)
78{
79 ASSERT(element);
80 if (styleUpdateStrategy == AllowStyleUpdate)
81 element->document().updateLayoutIgnorePendingStylesheets();
82
83 AffineTransform ctm;
84
85 SVGElement* stopAtElement = mode == NearestViewportScope ? nearestViewportElement(element) : nullptr;
86 for (Element* currentElement = element; currentElement; currentElement = currentElement->parentOrShadowHostElement()) {
87 if (!currentElement->isSVGElement())
88 break;
89
90 ctm = downcast<SVGElement>(*currentElement).localCoordinateSpaceTransform(mode).multiply(ctm);
91
92 // For getCTM() computation, stop at the nearest viewport element
93 if (currentElement == stopAtElement)
94 break;
95 }
96
97 return ctm;
98}
99
100ExceptionOr<Ref<SVGMatrix>> SVGLocatable::getTransformToElement(SVGElement* target, StyleUpdateStrategy styleUpdateStrategy)
101{
102 AffineTransform ctm = getCTM(styleUpdateStrategy);
103
104 if (is<SVGGraphicsElement>(target)) {
105 AffineTransform targetCTM = downcast<SVGGraphicsElement>(*target).getCTM(styleUpdateStrategy);
106 if (auto inverse = targetCTM.inverse())
107 ctm = inverse.value() * ctm;
108 else
109 return Exception { InvalidStateError, "Matrix is not invertible"_s };
110 }
111
112 return SVGMatrix::create(ctm);
113}
114
115}
116