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/*
* Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2006, 2007, 2010 Rob Buis <buis@kde.org>
* Copyright (C) 2018 Apple Inc. 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 "SVGFitToViewBox.h"
#include "AffineTransform.h"
#include "Document.h"
#include "FloatRect.h"
#include "SVGDocumentExtensions.h"
#include "SVGElement.h"
#include "SVGNames.h"
#include "SVGParserUtilities.h"
#include "SVGPreserveAspectRatioValue.h"
#include <wtf/text/MakeString.h>
#include <wtf/text/StringParsingBuffer.h>
#include <wtf/text/StringView.h>
namespace WebCore {
WTF_MAKE_TZONE_ALLOCATED_IMPL(SVGFitToViewBox);
SVGFitToViewBox::SVGFitToViewBox(SVGElement* contextElement, SVGPropertyAccess access)
: m_viewBox(SVGAnimatedRect::create(contextElement, access))
, m_preserveAspectRatio(SVGAnimatedPreserveAspectRatio::create(contextElement, access))
{
static std::once_flag onceFlag;
std::call_once(onceFlag, [] {
PropertyRegistry::registerProperty<SVGNames::viewBoxAttr, &SVGFitToViewBox::m_viewBox>();
PropertyRegistry::registerProperty<SVGNames::preserveAspectRatioAttr, &SVGFitToViewBox::m_preserveAspectRatio>();
});
}
void SVGFitToViewBox::setViewBox(const FloatRect& viewBox)
{
Ref { m_viewBox }->setBaseValInternal(viewBox);
m_isViewBoxValid = true;
}
void SVGFitToViewBox::resetViewBox()
{
Ref { m_viewBox }->setBaseValInternal({ });
m_isViewBoxValid = false;
}
void SVGFitToViewBox::reset()
{
resetViewBox();
resetPreserveAspectRatio();
}
bool SVGFitToViewBox::parseAttribute(const QualifiedName& name, const AtomString& value)
{
if (name == SVGNames::viewBoxAttr) {
if (!value.isNull()) {
if (auto result = parseViewBox(value)) {
setViewBox(WTFMove(*result));
return true;
}
}
resetViewBox();
return true;
}
if (name == SVGNames::preserveAspectRatioAttr) {
setPreserveAspectRatio(SVGPreserveAspectRatioValue { value });
return true;
}
return false;
}
std::optional<FloatRect> SVGFitToViewBox::parseViewBox(StringView value)
{
return readCharactersForParsing(value, [&](auto buffer) {
return parseViewBoxGeneric(buffer);
});
}
std::optional<FloatRect> SVGFitToViewBox::parseViewBox(StringParsingBuffer<LChar>& buffer, bool validate)
{
return parseViewBoxGeneric(buffer, validate);
}
std::optional<FloatRect> SVGFitToViewBox::parseViewBox(StringParsingBuffer<UChar>& buffer, bool validate)
{
return parseViewBoxGeneric(buffer, validate);
}
template<typename CharacterType> std::optional<FloatRect> SVGFitToViewBox::parseViewBoxGeneric(StringParsingBuffer<CharacterType>& buffer, bool validate)
{
StringView stringToParse = buffer.stringViewOfCharactersRemaining();
skipOptionalSVGSpaces(buffer);
auto x = parseNumber(buffer);
auto y = parseNumber(buffer);
auto width = parseNumber(buffer);
auto height = parseNumber(buffer, SuffixSkippingPolicy::DontSkip);
if (validate) {
Ref document = m_viewBox->contextElement()->document();
if (!x || !y || !width || !height) {
document->checkedSVGExtensions()->reportWarning(makeString("Problem parsing viewBox=\""_s, stringToParse, "\""_s));
return std::nullopt;
}
// Check that width is positive.
if (*width < 0.0) {
document->checkedSVGExtensions()->reportError("A negative value for ViewBox width is not allowed"_s);
return std::nullopt;
}
// Check that height is positive.
if (*height < 0.0) {
document->checkedSVGExtensions()->reportError("A negative value for ViewBox height is not allowed"_s);
return std::nullopt;
}
// Nothing should come after the last, fourth number.
skipOptionalSVGSpaces(buffer);
if (buffer.hasCharactersRemaining()) {
document->checkedSVGExtensions()->reportWarning(makeString("Problem parsing viewBox=\""_s, stringToParse, "\""_s));
return std::nullopt;
}
}
return FloatRect { x.value_or(0), y.value_or(0), width.value_or(0), height.value_or(0) };
}
AffineTransform SVGFitToViewBox::viewBoxToViewTransform(const FloatRect& viewBoxRect, const SVGPreserveAspectRatioValue& preserveAspectRatio, float viewWidth, float viewHeight)
{
if (!viewBoxRect.width() || !viewBoxRect.height() || !viewWidth || !viewHeight)
return AffineTransform();
return preserveAspectRatio.getCTM(viewBoxRect.x(), viewBoxRect.y(), viewBoxRect.width(), viewBoxRect.height(), viewWidth, viewHeight);
}
}
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