WebCore/rendering/RenderSVGViewportContainer.cpp

/*
    Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
                  2004, 2005, 2007 Rob Buis <buis@kde.org>
                  2007 Eric Seidel <eric@webkit.org>
                  2009 Google, Inc.
    Copyright (C) Research In Motion Limited 2009-2010. 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
    aint 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"

#if ENABLE(SVG)
#include "RenderSVGViewportContainer.h"

#include "GraphicsContext.h"
#include "RenderView.h"
#include "SVGSVGElement.h"

namespace WebCore {

RenderSVGViewportContainer::RenderSVGViewportContainer(SVGStyledElement* node)
    : RenderSVGContainer(node)
{
}

void RenderSVGViewportContainer::applyViewportClip(PaintInfo& paintInfo)
{
    if (SVGRenderSupport::isOverflowHidden(this))
        paintInfo.context->clip(m_viewport);
}

void RenderSVGViewportContainer::calcViewport()
{
     SVGElement* element = static_cast<SVGElement*>(node());
     if (element->hasTagName(SVGNames::svgTag)) {
         SVGSVGElement* svg = static_cast<SVGSVGElement*>(element);
         m_viewport = FloatRect(svg->x().value(svg)
                                , svg->y().value(svg)
                                , svg->width().value(svg)
                                , svg->height().value(svg));
    }
}

AffineTransform RenderSVGViewportContainer::viewportTransform() const
{
    if (node()->hasTagName(SVGNames::svgTag)) {
        SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
        return svg->viewBoxToViewTransform(m_viewport.width(), m_viewport.height());
    }

    return AffineTransform();
}

const AffineTransform& RenderSVGViewportContainer::localToParentTransform() const
{
    AffineTransform viewportTranslation(viewportTransform());
    m_localToParentTransform = viewportTranslation.translateRight(m_viewport.x(), m_viewport.y());
    return m_localToParentTransform;
    // If this class were ever given a localTransform(), then the above would read:
    // return viewportTransform() * localTransform() * viewportTranslation;
}

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);
}

}

#endif // ENABLE(SVG)