156 lines
5.2 KiB
C++
156 lines
5.2 KiB
C++
/*
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* Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
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* Copyright (C) 2004, 2005, 2006, 2007, 2010 Rob Buis <buis@kde.org>
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* Copyright (C) 2018 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "SVGFitToViewBox.h"
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#include "AffineTransform.h"
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#include "Document.h"
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#include "FloatRect.h"
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#include "SVGDocumentExtensions.h"
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#include "SVGElement.h"
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#include "SVGNames.h"
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#include "SVGParserUtilities.h"
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#include "SVGPreserveAspectRatioValue.h"
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#include <wtf/text/StringParsingBuffer.h>
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#include <wtf/text/StringView.h>
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namespace WebCore {
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SVGFitToViewBox::SVGFitToViewBox(SVGElement* contextElement, SVGPropertyAccess access)
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: m_viewBox(SVGAnimatedRect::create(contextElement, access))
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, m_preserveAspectRatio(SVGAnimatedPreserveAspectRatio::create(contextElement, access))
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{
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static std::once_flag onceFlag;
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std::call_once(onceFlag, [] {
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PropertyRegistry::registerProperty<SVGNames::viewBoxAttr, &SVGFitToViewBox::m_viewBox>();
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PropertyRegistry::registerProperty<SVGNames::preserveAspectRatioAttr, &SVGFitToViewBox::m_preserveAspectRatio>();
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});
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}
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void SVGFitToViewBox::setViewBox(const FloatRect& viewBox)
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{
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m_viewBox->setBaseValInternal(viewBox);
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m_isViewBoxValid = true;
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}
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void SVGFitToViewBox::resetViewBox()
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{
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m_viewBox->setBaseValInternal({ });
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m_isViewBoxValid = false;
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}
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void SVGFitToViewBox::reset()
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{
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resetViewBox();
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resetPreserveAspectRatio();
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}
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bool SVGFitToViewBox::parseAttribute(const QualifiedName& name, const AtomString& value)
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{
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if (name == SVGNames::viewBoxAttr) {
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if (!value.isNull()) {
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if (auto result = parseViewBox(value)) {
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setViewBox(WTFMove(*result));
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return true;
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}
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}
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resetViewBox();
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return true;
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}
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if (name == SVGNames::preserveAspectRatioAttr) {
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setPreserveAspectRatio(SVGPreserveAspectRatioValue { value });
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return true;
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}
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return false;
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}
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std::optional<FloatRect> SVGFitToViewBox::parseViewBox(StringView value)
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{
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return readCharactersForParsing(value, [&](auto buffer) {
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return parseViewBoxGeneric(buffer);
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});
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}
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std::optional<FloatRect> SVGFitToViewBox::parseViewBox(StringParsingBuffer<LChar>& buffer, bool validate)
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{
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return parseViewBoxGeneric(buffer, validate);
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}
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std::optional<FloatRect> SVGFitToViewBox::parseViewBox(StringParsingBuffer<UChar>& buffer, bool validate)
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{
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return parseViewBoxGeneric(buffer, validate);
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}
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template<typename CharacterType> std::optional<FloatRect> SVGFitToViewBox::parseViewBoxGeneric(StringParsingBuffer<CharacterType>& buffer, bool validate)
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{
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StringView stringToParse = buffer.stringViewOfCharactersRemaining();
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skipOptionalSVGSpaces(buffer);
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auto x = parseNumber(buffer);
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auto y = parseNumber(buffer);
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auto width = parseNumber(buffer);
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auto height = parseNumber(buffer, SuffixSkippingPolicy::DontSkip);
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if (validate) {
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Document& document = m_viewBox->contextElement()->document();
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if (!x || !y || !width || !height) {
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document.accessSVGExtensions().reportWarning(makeString("Problem parsing viewBox=\"", stringToParse, "\""));
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return std::nullopt;
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}
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// Check that width is positive.
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if (*width < 0.0) {
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document.accessSVGExtensions().reportError("A negative value for ViewBox width is not allowed");
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return std::nullopt;
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}
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// Check that height is positive.
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if (*height < 0.0) {
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document.accessSVGExtensions().reportError("A negative value for ViewBox height is not allowed");
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return std::nullopt;
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}
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// Nothing should come after the last, fourth number.
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skipOptionalSVGSpaces(buffer);
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if (buffer.hasCharactersRemaining()) {
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document.accessSVGExtensions().reportWarning(makeString("Problem parsing viewBox=\"", stringToParse, "\""));
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return std::nullopt;
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}
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}
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return FloatRect { x.value_or(0), y.value_or(0), width.value_or(0), height.value_or(0) };
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}
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AffineTransform SVGFitToViewBox::viewBoxToViewTransform(const FloatRect& viewBoxRect, const SVGPreserveAspectRatioValue& preserveAspectRatio, float viewWidth, float viewHeight)
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{
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if (!viewBoxRect.width() || !viewBoxRect.height() || !viewWidth || !viewHeight)
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return AffineTransform();
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return preserveAspectRatio.getCTM(viewBoxRect.x(), viewBoxRect.y(), viewBoxRect.width(), viewBoxRect.height(), viewWidth, viewHeight);
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}
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}
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