1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/*
* Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
* Copyright (C) 2009 Google, Inc. All rights reserved.
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "SVGLocatable.h"
#include "RenderElement.h"
#include "SVGElementTypeHelpers.h"
#include "SVGGraphicsElement.h"
#include "SVGImageElement.h"
#include "SVGLayerTransformComputation.h"
#include "SVGMatrix.h"
#include "SVGNames.h"
#include "TransformState.h"
namespace WebCore {
static bool isViewportElement(Node* node)
{
return (node->hasTagName(SVGNames::svgTag)
|| node->hasTagName(SVGNames::symbolTag)
|| node->hasTagName(SVGNames::foreignObjectTag)
|| is<SVGImageElement>(*node));
}
SVGElement* SVGLocatable::nearestViewportElement(const SVGElement* element)
{
ASSERT(element);
for (Element* current = element->parentOrShadowHostElement(); current; current = current->parentOrShadowHostElement()) {
if (isViewportElement(current))
return downcast<SVGElement>(current);
}
return nullptr;
}
SVGElement* SVGLocatable::farthestViewportElement(const SVGElement* element)
{
ASSERT(element);
SVGElement* farthest = nullptr;
for (Element* current = element->parentOrShadowHostElement(); current; current = current->parentOrShadowHostElement()) {
if (isViewportElement(current))
farthest = downcast<SVGElement>(current);
}
return farthest;
}
FloatRect SVGLocatable::getBBox(SVGElement* element, StyleUpdateStrategy styleUpdateStrategy)
{
ASSERT(element);
if (styleUpdateStrategy == AllowStyleUpdate)
element->document().updateLayoutIgnorePendingStylesheets();
// FIXME: Eventually we should support getBBox for detached elements.
if (!element->renderer())
return FloatRect();
return element->renderer()->objectBoundingBox();
}
AffineTransform SVGLocatable::computeCTM(SVGElement* element, CTMScope mode, StyleUpdateStrategy styleUpdateStrategy)
{
ASSERT(element);
if (styleUpdateStrategy == AllowStyleUpdate)
element->document().updateLayoutIgnorePendingStylesheets();
SVGElement* stopAtElement = mode == NearestViewportScope ? nearestViewportElement(element) : nullptr;
#if ENABLE(LAYER_BASED_SVG_ENGINE)
if (element->document().settings().layerBasedSVGEngineEnabled()) {
// Rudimentary support for operations on "detached" elements.
auto* renderer = dynamicDowncast<RenderLayerModelObject>(element->renderer());
if (!renderer)
return element->localCoordinateSpaceTransform(mode);
auto trackingMode { mode == SVGLocatable::ScreenScope ? TransformState::TrackSVGScreenCTMMatrix : TransformState::TrackSVGCTMMatrix };
auto* stopAtRenderer = dynamicDowncast<RenderLayerModelObject>(stopAtElement ? stopAtElement->renderer() : nullptr);
return SVGLayerTransformComputation(*renderer).computeAccumulatedTransform(stopAtRenderer, trackingMode);
}
#endif
AffineTransform ctm;
for (Element* currentElement = element; currentElement; currentElement = currentElement->parentOrShadowHostElement()) {
if (!currentElement->isSVGElement())
break;
ctm = downcast<SVGElement>(*currentElement).localCoordinateSpaceTransform(mode).multiply(ctm);
// For getCTM() computation, stop at the nearest viewport element
if (currentElement == stopAtElement)
break;
}
return ctm;
}
ExceptionOr<Ref<SVGMatrix>> SVGLocatable::getTransformToElement(SVGElement* target, StyleUpdateStrategy styleUpdateStrategy)
{
AffineTransform ctm = getCTM(styleUpdateStrategy);
if (is<SVGGraphicsElement>(target)) {
AffineTransform targetCTM = downcast<SVGGraphicsElement>(*target).getCTM(styleUpdateStrategy);
if (auto inverse = targetCTM.inverse())
ctm = inverse.value() * ctm;
else
return Exception { InvalidStateError, "Matrix is not invertible"_s };
}
return SVGMatrix::create(ctm);
}
}
|
