/*

 * Copyright (C) 2006 Apple Computer, Inc.

 * Copyright (C) 2009 Google, Inc.

 * Copyright (C) Research In Motion Limited 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

 * 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"

#if ENABLE(SVG) && ENABLE(SVG_FOREIGN_OBJECT)

#include "RenderForeignObject.h"

#include "GraphicsContext.h"

#include "RenderSVGResource.h"

#include "RenderView.h"

#include "SVGForeignObjectElement.h"

#include "SVGRenderSupport.h"

#include "SVGSVGElement.h"

#include "TransformState.h"

namespace WebCore {

RenderForeignObject::RenderForeignObject(SVGForeignObjectElement* node) 

    : RenderSVGBlock(node)

    , m_needsTransformUpdate(true)

{

}

void RenderForeignObject::paint(PaintInfo& paintInfo, int, int)

{

    if (paintInfo.context->paintingDisabled())

        return;

    PaintInfo childPaintInfo(paintInfo);

    childPaintInfo.context->save();

    childPaintInfo.applyTransform(localTransform());

    if (SVGRenderSupport::isOverflowHidden(this))

        childPaintInfo.context->clip(m_viewport);

    float opacity = style()->opacity();

    if (opacity < 1.0f)

        childPaintInfo.context->beginTransparencyLayer(opacity);

    RenderBlock::paint(childPaintInfo, 0, 0);

    if (opacity < 1.0f)

        childPaintInfo.context->endTransparencyLayer();

    childPaintInfo.context->restore();

}

IntRect RenderForeignObject::clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer)

{

    return SVGRenderSupport::clippedOverflowRectForRepaint(this, repaintContainer);

}

void RenderForeignObject::computeRectForRepaint(RenderBoxModelObject* repaintContainer, IntRect& repaintRect, bool fixed)

{

    SVGRenderSupport::computeRectForRepaint(this, repaintContainer, repaintRect, fixed);

}

const AffineTransform& RenderForeignObject::localToParentTransform() const

{

    m_localToParentTransform = localTransform();

    m_localToParentTransform.translate(m_viewport.x(), m_viewport.y());

    return m_localToParentTransform;

}

void RenderForeignObject::calcWidth()

{

    // FIXME: Investigate in size rounding issues

    setWidth(static_cast<int>(roundf(m_viewport.width())));

}

void RenderForeignObject::calcHeight()

{

    // FIXME: Investigate in size rounding issues

    setHeight(static_cast<int>(roundf(m_viewport.height())));

}

void RenderForeignObject::layout()

{

    ASSERT(needsLayout());

    ASSERT(!view()->layoutStateEnabled()); // RenderSVGRoot disables layoutState for the SVG rendering tree.

    LayoutRepainter repainter(*this, m_everHadLayout && checkForRepaintDuringLayout());

    SVGForeignObjectElement* foreign = static_cast<SVGForeignObjectElement*>(node());

    if (m_needsTransformUpdate) {

        m_localTransform = foreign->animatedLocalTransform();

        m_needsTransformUpdate = false;

    }

    // Cache viewport boundaries

    FloatPoint viewportLocation(foreign->x().value(foreign), foreign->y().value(foreign));

    m_viewport = FloatRect(viewportLocation, FloatSize(foreign->width().value(foreign), foreign->height().value(foreign)));

    // Set box origin to the foreignObject x/y translation, so positioned objects in XHTML content get correct

    // positions. A regular RenderBoxModelObject would pull this information from RenderStyle - in SVG those

    // properties are ignored for non <svg> elements, so we mimic what happens when specifying them through CSS.

    // FIXME: Investigate in location rounding issues - only affects RenderForeignObject & RenderSVGText

    setLocation(roundedIntPoint(viewportLocation));

    RenderBlock::layout();

    // Invalidate all resources of this client, if we changed something.

    if (m_everHadLayout && selfNeedsLayout())

        RenderSVGResource::invalidateAllResourcesOfRenderer(this);

    repainter.repaintAfterLayout();

    setNeedsLayout(false);

}

bool RenderForeignObject::nodeAtFloatPoint(const HitTestRequest& request, HitTestResult& result, const FloatPoint& pointInParent, HitTestAction hitTestAction)

{

    FloatPoint localPoint = localTransform().inverse().mapPoint(pointInParent);

    // Early exit if local point is not contained in clipped viewport area

    if (SVGRenderSupport::isOverflowHidden(this) && !m_viewport.contains(localPoint))

        return false;

    IntPoint roundedLocalPoint = roundedIntPoint(localPoint);

    return RenderBlock::nodeAtPoint(request, result, roundedLocalPoint.x(), roundedLocalPoint.y(), 0, 0, hitTestAction);

}

bool RenderForeignObject::nodeAtPoint(const HitTestRequest&, HitTestResult&, int, int, int, int, HitTestAction)

{

    ASSERT_NOT_REACHED();

    return false;

}

void RenderForeignObject::mapLocalToContainer(RenderBoxModelObject* repaintContainer, bool fixed, bool useTransforms, TransformState& transformState) const

{

    // When crawling up the hierachy starting from foreignObject child content, useTransforms may not be set to true.

    if (!useTransforms)

        useTransforms = true;

    SVGRenderSupport::mapLocalToContainer(this, repaintContainer, fixed, useTransforms, transformState);

}

}

#endif