third_party/WebKit/Source/core/svg/SVGFitToViewBox.cpp

/*
 * Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
 * Copyright (C) 2004, 2005, 2006, 2007, 2010 Rob Buis <buis@kde.org>
 * Copyright (C) 2014 Samsung Electronics. 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 "core/svg/SVGFitToViewBox.h"

#include "core/svg/SVGElement.h"
#include "core/svg/SVGParsingError.h"
#include "platform/geometry/FloatRect.h"
#include "platform/transforms/AffineTransform.h"

namespace blink {

class SVGAnimatedViewBoxRect : public SVGAnimatedRect {
 public:
  static SVGAnimatedRect* create(SVGElement* contextElement) {
    return new SVGAnimatedViewBoxRect(contextElement);
  }

  SVGParsingError setBaseValueAsString(const String&) override;

 protected:
  SVGAnimatedViewBoxRect(SVGElement* contextElement)
      : SVGAnimatedRect(contextElement, SVGNames::viewBoxAttr) {}
};

SVGParsingError SVGAnimatedViewBoxRect::setBaseValueAsString(
    const String& value) {
  SVGParsingError parseStatus = SVGAnimatedRect::setBaseValueAsString(value);

  if (parseStatus == SVGParseStatus::NoError &&
      (baseValue()->width() < 0 || baseValue()->height() < 0)) {
    parseStatus = SVGParseStatus::NegativeValue;
    baseValue()->setInvalid();
  }
  return parseStatus;
}

SVGFitToViewBox::SVGFitToViewBox(SVGElement* element)
    : m_viewBox(SVGAnimatedViewBoxRect::create(element)),
      m_preserveAspectRatio(SVGAnimatedPreserveAspectRatio::create(
          element,
          SVGNames::preserveAspectRatioAttr)) {
  DCHECK(element);
  element->addToPropertyMap(m_viewBox);
  element->addToPropertyMap(m_preserveAspectRatio);
}

DEFINE_TRACE(SVGFitToViewBox) {
  visitor->trace(m_viewBox);
  visitor->trace(m_preserveAspectRatio);
}

AffineTransform SVGFitToViewBox::viewBoxToViewTransform(
    const FloatRect& viewBoxRect,
    SVGPreserveAspectRatio* 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);
}

bool SVGFitToViewBox::isKnownAttribute(const QualifiedName& attrName) {
  return attrName == SVGNames::viewBoxAttr ||
         attrName == SVGNames::preserveAspectRatioAttr;
}

}  // namespace blink