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/*
* 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"
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();
}
PassOwnPtr<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.calculateAnimatedLocalTransform());
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
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