/*

    Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>

                  2004, 2005, 2007, 2008 Rob Buis <buis@kde.org>

                  2007 Eric Seidel <eric@webkit.org>

    Copyright (C) 2009 Google, Inc.  All rights reserved.

                  2009 Dirk Schulze <krit@webkit.org>

    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 "RenderSVGContainer.h"

#include "GraphicsContext.h"

#include "RenderSVGResourceFilter.h"

#include "RenderView.h"

#include "SVGRenderSupport.h"

#include "SVGStyledElement.h"

namespace WebCore {

RenderSVGContainer::RenderSVGContainer(SVGStyledElement* node)

    : RenderSVGModelObject(node)

    , m_drawsContents(true)

{

}

void RenderSVGContainer::layout()

{

    ASSERT(needsLayout());

    // RenderSVGRoot disables layoutState for the SVG rendering tree.

    ASSERT(!view()->layoutStateEnabled());

    // Allow RenderSVGViewportContainer to update its viewport.

    calcViewport();

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

    // Allow RenderSVGTransformableContainer to update its transform.

    calculateLocalTransform();

    SVGRenderSupport::layoutChildren(this, selfNeedsLayout());

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

    if (m_everHadLayout && selfNeedsLayout())

        RenderSVGResource::invalidateAllResourcesOfRenderer(this);

    repainter.repaintAfterLayout();

    setNeedsLayout(false);

}

bool RenderSVGContainer::selfWillPaint() const

{

#if ENABLE(FILTERS)

    const SVGRenderStyle* svgStyle = style()->svgStyle();

    RenderSVGResourceFilter* filter = getRenderSVGResourceById<RenderSVGResourceFilter>(document(), svgStyle->filterResource());

    if (filter)

        return true;

#endif

    return false;

}

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

{

    if (paintInfo.context->paintingDisabled() || !drawsContents())

        return;

    // Spec: groups w/o children still may render filter content.

    if (!firstChild() && !selfWillPaint())

        return;

    PaintInfo childPaintInfo(paintInfo);

    childPaintInfo.context->save();

    // Let the RenderSVGViewportContainer subclass clip if necessary

    applyViewportClip(childPaintInfo);

    childPaintInfo.applyTransform(localToParentTransform());

    bool continueRendering = true;

    if (childPaintInfo.phase == PaintPhaseForeground)

        continueRendering = SVGRenderSupport::prepareToRenderSVGContent(this, childPaintInfo);

    if (continueRendering) {

        childPaintInfo.updatePaintingRootForChildren(this);

        for (RenderObject* child = firstChild(); child; child = child->nextSibling())

            child->paint(childPaintInfo, 0, 0);

    }

    if (paintInfo.phase == PaintPhaseForeground)

        SVGRenderSupport::finishRenderSVGContent(this, childPaintInfo, paintInfo.context);

    childPaintInfo.context->restore();

    // FIXME: This really should be drawn from local coordinates, but currently we hack it

    // to avoid our clip killing our outline rect.  Thus we translate our

    // outline rect into parent coords before drawing.

    // FIXME: This means our focus ring won't share our rotation like it should.

    // We should instead disable our clip during PaintPhaseOutline

    if ((paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) && style()->outlineWidth() && style()->visibility() == VISIBLE) {

        IntRect paintRectInParent = enclosingIntRect(localToParentTransform().mapRect(repaintRectInLocalCoordinates()));

        paintOutline(paintInfo.context, paintRectInParent.x(), paintRectInParent.y(), paintRectInParent.width(), paintRectInParent.height());

    }

}

// addFocusRingRects is called from paintOutline and needs to be in the same coordinates as the paintOuline call

void RenderSVGContainer::addFocusRingRects(Vector<IntRect>& rects, int, int)

{

    IntRect paintRectInParent = enclosingIntRect(localToParentTransform().mapRect(repaintRectInLocalCoordinates()));

    if (!paintRectInParent.isEmpty())

        rects.append(paintRectInParent);

}

FloatRect RenderSVGContainer::objectBoundingBox() const

{

    return SVGRenderSupport::computeContainerBoundingBox(this, SVGRenderSupport::ObjectBoundingBox);

}

FloatRect RenderSVGContainer::strokeBoundingBox() const

{

    return SVGRenderSupport::computeContainerBoundingBox(this, SVGRenderSupport::StrokeBoundingBox);

}

FloatRect RenderSVGContainer::repaintRectInLocalCoordinates() const

{

    FloatRect repaintRect = SVGRenderSupport::computeContainerBoundingBox(this, SVGRenderSupport::RepaintBoundingBox);

    SVGRenderSupport::intersectRepaintRectWithResources(this, repaintRect);

    return repaintRect;

}

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

{

    // Give RenderSVGViewportContainer a chance to apply its viewport clip

    if (!pointIsInsideViewportClip(pointInParent))

        return false;

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

    if (!SVGRenderSupport::pointInClippingArea(this, localPoint))

        return false;

    for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {

        if (child->nodeAtFloatPoint(request, result, localPoint, hitTestAction)) {

            updateHitTestResult(result, roundedIntPoint(localPoint));

            return true;

        }

    }

    // Spec: Only graphical elements can be targeted by the mouse, period.

    // 16.4: "If there are no graphics elements whose relevant graphics content is under the pointer (i.e., there is no target element), the event is not dispatched."

    return false;

}

}

#endif // ENABLE(SVG)