text: /*
   * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
   * Copyright (C) 2004, 2005, 2007 Rob Buis <buis@kde.org>
   * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
   * Copyright (C) 2009 Google, Inc.
   *
   * 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 "RenderSVGViewportContainer.h"
  
  #include "GraphicsContext.h"
  #include "RenderView.h"
  #include "SVGSVGElement.h"
  
  namespace WebCore {
  
  RenderSVGViewportContainer::RenderSVGViewportContainer(SVGSVGElement& element, RenderStyle&& style)
      : RenderSVGContainer(element, WTFMove(style))
      , m_didTransformToRootUpdate(false)
      , m_isLayoutSizeChanged(false)
      , m_needsTransformUpdate(true)
  {
  }
  
  SVGSVGElement& RenderSVGViewportContainer::svgSVGElement() const
  {
      return downcast<SVGSVGElement>(RenderSVGContainer::element());
  }
  
  void RenderSVGViewportContainer::determineIfLayoutSizeChanged()
  {
      m_isLayoutSizeChanged = svgSVGElement().hasRelativeLengths() && selfNeedsLayout();
  }
  
  void RenderSVGViewportContainer::applyViewportClip(PaintInfo& paintInfo)
  {
      if (SVGRenderSupport::isOverflowHidden(*this))
          paintInfo.context().clip(m_viewport);
  }
  
  void RenderSVGViewportContainer::calcViewport()
  {
      SVGSVGElement& element = svgSVGElement();
      SVGLengthContext lengthContext(&element);
      FloatRect newViewport(element.x().value(lengthContext), element.y().value(lengthContext), element.width().value(lengthContext), element.height().value(lengthContext));
  
      if (m_viewport == newViewport)
          return;
  
      m_viewport = newViewport;
  
      setNeedsBoundariesUpdate();
      setNeedsTransformUpdate();
  }
  
  bool RenderSVGViewportContainer::calculateLocalTransform() 
  {
      m_didTransformToRootUpdate = m_needsTransformUpdate || SVGRenderSupport::transformToRootChanged(parent());
      if (!m_needsTransformUpdate)
          return false;
      
      m_localToParentTransform = AffineTransform::translation(m_viewport.x(), m_viewport.y()) * viewportTransform();
      m_needsTransformUpdate = false;
      return true;
  }
  
  AffineTransform RenderSVGViewportContainer::viewportTransform() const
  {
      return svgSVGElement().viewBoxToViewTransform(m_viewport.width(), m_viewport.height());
  }
  
  bool RenderSVGViewportContainer::pointIsInsideViewportClip(const FloatPoint& pointInParent)
  {
      // Respect the viewport clip (which is in parent coords)
      if (!SVGRenderSupport::isOverflowHidden(*this))
          return true;
      
      return m_viewport.contains(pointInParent);
  }
  
  void RenderSVGViewportContainer::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
  {
      // An empty viewBox disables rendering.
      if (svgSVGElement().hasEmptyViewBox())
          return;
  
      RenderSVGContainer::paint(paintInfo, paintOffset);
  }
  
  }
  