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
|
/*
* Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
*
* 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 "core/layout/svg/LayoutSVGTextPath.h"
#include "core/layout/svg/SVGLayoutSupport.h"
#include "core/svg/SVGPathElement.h"
#include "core/svg/SVGTextPathElement.h"
#include "platform/graphics/Path.h"
#include <memory>
namespace blink {
TreeScope& treeScopeForIdResolution(const SVGElement& element) {
if (SVGElement* correspondingElement = element.correspondingElement())
return correspondingElement->treeScope();
return element.treeScope();
}
PathPositionMapper::PathPositionMapper(const Path& path)
: m_positionCalculator(path), m_pathLength(path.length()) {}
PathPositionMapper::PositionType PathPositionMapper::pointAndNormalAtLength(
float length,
FloatPoint& point,
float& angle) {
if (length < 0)
return BeforePath;
if (length > m_pathLength)
return AfterPath;
ASSERT(length >= 0 && length <= m_pathLength);
m_positionCalculator.pointAndNormalAtLength(length, point, angle);
return OnPath;
}
LayoutSVGTextPath::LayoutSVGTextPath(Element* element)
: LayoutSVGInline(element) {}
bool LayoutSVGTextPath::isChildAllowed(LayoutObject* child,
const ComputedStyle&) const {
if (child->isText())
return SVGLayoutSupport::isLayoutableTextNode(child);
return child->isSVGInline() && !child->isSVGTextPath();
}
std::unique_ptr<PathPositionMapper> LayoutSVGTextPath::layoutPath() const {
const SVGTextPathElement& textPathElement = toSVGTextPathElement(*node());
Element* targetElement = SVGURIReference::targetElementFromIRIString(
textPathElement.hrefString(), treeScopeForIdResolution(textPathElement));
if (!isSVGPathElement(targetElement))
return nullptr;
SVGPathElement& pathElement = toSVGPathElement(*targetElement);
Path pathData = pathElement.asPath();
if (pathData.isEmpty())
return nullptr;
// Spec: The transform attribute on the referenced 'path' element represents
// a supplemental transformation relative to the current user coordinate
// system for the current 'text' element, including any adjustments to the
// current user coordinate system due to a possible transform attribute on the
// current 'text' element. http://www.w3.org/TR/SVG/text.html#TextPathElement
pathData.transform(
pathElement.calculateTransform(SVGElement::IncludeMotionTransform));
return PathPositionMapper::create(pathData);
}
float LayoutSVGTextPath::calculateStartOffset(float pathLength) const {
const SVGLength& startOffset =
*toSVGTextPathElement(node())->startOffset()->currentValue();
float textPathStartOffset = startOffset.valueAsPercentage();
if (startOffset.typeWithCalcResolved() ==
CSSPrimitiveValue::UnitType::Percentage)
textPathStartOffset *= pathLength;
return textPathStartOffset;
}
} // namespace blink
|
