blob: d15e3546c1213e00dfa57c81b4a00b2efe30a973 [file] [log] [blame]
/*
* 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/StringView.h>
namespace WebCore {
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)
{
m_viewBox->setBaseValInternal(viewBox);
m_isViewBoxValid = true;
}
void SVGFitToViewBox::resetViewBox()
{
m_viewBox->setBaseValInternal({ });
m_isViewBoxValid = false;
}
void SVGFitToViewBox::reset()
{
resetViewBox();
resetPreserveAspectRatio();
}
bool SVGFitToViewBox::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
if (name == SVGNames::viewBoxAttr) {
FloatRect viewBox;
if (!value.isNull() && parseViewBox(value, viewBox))
setViewBox(viewBox);
else
resetViewBox();
return true;
}
if (name == SVGNames::preserveAspectRatioAttr) {
SVGPreserveAspectRatioValue preserveAspectRatio;
preserveAspectRatio.parse(value);
setPreserveAspectRatio(preserveAspectRatio);
return true;
}
return false;
}
bool SVGFitToViewBox::parseViewBox(const AtomicString& value, FloatRect& viewBox)
{
auto upconvertedCharacters = StringView(value).upconvertedCharacters();
const UChar* characters = upconvertedCharacters;
return parseViewBox(characters, characters + value.length(), viewBox);
}
bool SVGFitToViewBox::parseViewBox(const UChar*& c, const UChar* end, FloatRect& viewBox, bool validate)
{
String str(c, end - c);
skipOptionalSVGSpaces(c, end);
float x = 0.0f;
float y = 0.0f;
float width = 0.0f;
float height = 0.0f;
bool valid = parseNumber(c, end, x) && parseNumber(c, end, y) && parseNumber(c, end, width) && parseNumber(c, end, height, false);
if (validate) {
Document& document = m_viewBox->contextElement()->document();
if (!valid) {
document.accessSVGExtensions().reportWarning("Problem parsing viewBox=\"" + str + "\"");
return false;
}
// Check that width is positive.
if (width < 0.0) {
document.accessSVGExtensions().reportError("A negative value for ViewBox width is not allowed");
return false;
}
// Check that height is positive.
if (height < 0.0) {
document.accessSVGExtensions().reportError("A negative value for ViewBox height is not allowed");
return false;
}
// Nothing should come after the last, fourth number.
skipOptionalSVGSpaces(c, end);
if (c < end) {
document.accessSVGExtensions().reportWarning("Problem parsing viewBox=\"" + str + "\"");
return false;
}
}
viewBox = { x, y, width, height };
return true;
}
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);
}
}