/*

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

                  2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>

                  2007 Eric Seidel <eric@webkit.org>

                  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

    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 "RenderSVGRoot.h"

#include "GraphicsContext.h"

#include "HitTestResult.h"

#include "RenderSVGContainer.h"

#include "RenderSVGResource.h"

#include "RenderView.h"

#include "SVGLength.h"

#include "SVGRenderSupport.h"

#include "SVGSVGElement.h"

#include "SVGStyledElement.h"

#include "TransformState.h"

#if ENABLE(FILTERS)

#include "RenderSVGResourceFilter.h"

#endif

using namespace std;

namespace WebCore {

RenderSVGRoot::RenderSVGRoot(SVGStyledElement* node)

    : RenderBox(node)

    , m_isLayoutSizeChanged(false)

{

    setReplaced(true);

}

int RenderSVGRoot::lineHeight(bool, bool) const

{

    return height() + marginTop() + marginBottom();

}

int RenderSVGRoot::baselinePosition(bool, bool) const

{

    return height() + marginTop() + marginBottom();

}

void RenderSVGRoot::calcPrefWidths()

{

    ASSERT(prefWidthsDirty());

    int borderAndPadding = borderAndPaddingWidth();

    int width = calcReplacedWidth(false) + borderAndPadding;

    if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength)

        width = min(width, style()->maxWidth().value() + (style()->boxSizing() == CONTENT_BOX ? borderAndPadding : 0));

    if (style()->width().isPercent() || (style()->width().isAuto() && style()->height().isPercent())) {

        m_minPrefWidth = 0;

        m_maxPrefWidth = width;

    } else

        m_minPrefWidth = m_maxPrefWidth = width;

    setPrefWidthsDirty(false);

}

int RenderSVGRoot::calcReplacedWidth(bool includeMaxWidth) const

{

    int replacedWidth = RenderBox::calcReplacedWidth(includeMaxWidth);

    if (!style()->width().isPercent())

        return replacedWidth;

    // FIXME: Investigate in size rounding issues

    SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());

    return static_cast<int>(roundf(replacedWidth * svg->currentScale()));

}

int RenderSVGRoot::calcReplacedHeight() const

{

    int replacedHeight = RenderBox::calcReplacedHeight();

    if (!style()->height().isPercent())

        return replacedHeight;

    // FIXME: Investigate in size rounding issues

    SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());

    return static_cast<int>(roundf(replacedHeight * svg->currentScale()));

}

void RenderSVGRoot::layout()

{

    ASSERT(needsLayout());

    // Arbitrary affine transforms are incompatible with LayoutState.

    view()->disableLayoutState();

    bool needsLayout = selfNeedsLayout();

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

    IntSize oldSize(width(), height());

    calcWidth();

    calcHeight();

    calcViewport();

    SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());

    m_isLayoutSizeChanged = svg->hasRelativeLengths() && oldSize != size();

    SVGRenderSupport::layoutChildren(this, needsLayout);

    m_isLayoutSizeChanged = false;

    repainter.repaintAfterLayout();

    view()->enableLayoutState();

    setNeedsLayout(false);

}

bool RenderSVGRoot::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 RenderSVGRoot::paint(PaintInfo& paintInfo, int parentX, int parentY)

{

    if (paintInfo.context->paintingDisabled())

        return;

    bool isVisible = style()->visibility() == VISIBLE;

    IntPoint parentOriginInContainer(parentX, parentY);

    IntPoint borderBoxOriginInContainer = parentOriginInContainer + parentOriginToBorderBox();

    if (hasBoxDecorations() && (paintInfo.phase == PaintPhaseBlockBackground || paintInfo.phase == PaintPhaseChildBlockBackground) && isVisible)

        paintBoxDecorations(paintInfo, borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y());

    if (paintInfo.phase == PaintPhaseBlockBackground)

        return;

    // An empty viewport disables rendering.  FIXME: Should we still render filters?

    if (m_viewportSize.isEmpty())

        return;

    // Don't paint if we don't have kids, except if we have filters we should paint those.

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

        return;

    // Make a copy of the PaintInfo because applyTransform will modify the damage rect.

    PaintInfo childPaintInfo(paintInfo);

    childPaintInfo.context->save();

    // Apply initial viewport clip - not affected by overflow handling

    childPaintInfo.context->clip(overflowClipRect(borderBoxOriginInContainer.x(), borderBoxOriginInContainer.y()));

    // Convert from container offsets (html renderers) to a relative transform (svg renderers).

    // Transform from our paint container's coordinate system to our local coords.

    childPaintInfo.applyTransform(localToRepaintContainerTransform(parentOriginInContainer));

    bool continueRendering = true;

    if (childPaintInfo.phase == PaintPhaseForeground)

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

    if (continueRendering)

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

    if (childPaintInfo.phase == PaintPhaseForeground)

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

    childPaintInfo.context->restore();

    if ((paintInfo.phase == PaintPhaseOutline || paintInfo.phase == PaintPhaseSelfOutline) && style()->outlineWidth() && isVisible)

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

}

void RenderSVGRoot::destroy()

{

    RenderSVGResource::invalidateAllResourcesOfRenderer(this);

    RenderBox::destroy();

}

void RenderSVGRoot::calcViewport()

{

    SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());

    if (!svg->hasSetContainerSize()) {

        // In the normal case of <svg> being stand-alone or in a CSSBoxModel object we use

        // RenderBox::width()/height() (which pulls data from RenderStyle)

        m_viewportSize = FloatSize(width(), height());

        return;

    }

    // In the SVGImage case grab the SVGLength values off of SVGSVGElement and use

    // the special relativeWidthValue accessors which respect the specified containerSize

    // FIXME: Check how SVGImage + zooming is supposed to be handled?

    SVGLength width = svg->width();

    SVGLength height = svg->height();

    m_viewportSize = FloatSize(width.unitType() == LengthTypePercentage ? svg->relativeWidthValue() : width.value(svg),

                               height.unitType() == LengthTypePercentage ? svg->relativeHeightValue() : height.value(svg));

}

// RenderBox methods will expect coordinates w/o any transforms in coordinates

// relative to our borderBox origin.  This method gives us exactly that.

AffineTransform RenderSVGRoot::localToBorderBoxTransform() const

{

    IntSize borderAndPadding = borderOriginToContentBox();

    SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());

    float scale = svg->currentScale();

    FloatPoint translate = svg->currentTranslate();

    AffineTransform ctm(scale, 0, 0, scale, borderAndPadding.width() + translate.x(), borderAndPadding.height() + translate.y());

    return svg->viewBoxToViewTransform(width() / scale, height() / scale) * ctm;

}

IntSize RenderSVGRoot::parentOriginToBorderBox() const

{

    return IntSize(x(), y());

}

IntSize RenderSVGRoot::borderOriginToContentBox() const

{

    return IntSize(borderLeft() + paddingLeft(), borderTop() + paddingTop());

}

AffineTransform RenderSVGRoot::localToRepaintContainerTransform(const IntPoint& parentOriginInContainer) const

{

    AffineTransform parentToContainer(localToParentTransform());

    return parentToContainer.translateRight(parentOriginInContainer.x(), parentOriginInContainer.y());

}

const AffineTransform& RenderSVGRoot::localToParentTransform() const

{

    IntSize parentToBorderBoxOffset = parentOriginToBorderBox();

    AffineTransform borderBoxOriginToParentOrigin(localToBorderBoxTransform());

    borderBoxOriginToParentOrigin.translateRight(parentToBorderBoxOffset.width(), parentToBorderBoxOffset.height());

    m_localToParentTransform = borderBoxOriginToParentOrigin;

    return m_localToParentTransform;

}

FloatRect RenderSVGRoot::objectBoundingBox() const

{

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

}

FloatRect RenderSVGRoot::strokeBoundingBox() const

{

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

}

FloatRect RenderSVGRoot::repaintRectInLocalCoordinates() const

{

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

    style()->svgStyle()->inflateForShadow(repaintRect);

    repaintRect.inflate(borderAndPaddingWidth());

    return repaintRect;

}

IntRect RenderSVGRoot::clippedOverflowRectForRepaint(RenderBoxModelObject* repaintContainer)

{

    return SVGRenderSupport::clippedOverflowRectForRepaint(this, repaintContainer);

}

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

{

    // Apply our local transforms (except for x/y translation), then our shadow, 

    // and then call RenderBox's method to handle all the normal CSS Box model bits

    repaintRect = localToBorderBoxTransform().mapRect(repaintRect);

    // Apply initial viewport clip - not affected by overflow settings    

    repaintRect.intersect(enclosingIntRect(FloatRect(FloatPoint(), m_viewportSize)));

    style()->svgStyle()->inflateForShadow(repaintRect);

    RenderBox::computeRectForRepaint(repaintContainer, repaintRect, fixed);

}

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

{

    ASSERT(!fixed); // We should have no fixed content in the SVG rendering tree.

    ASSERT(useTransforms); // mapping a point through SVG w/o respecting trasnforms is useless.

    // Transform to our border box and let RenderBox transform the rest of the way.

    transformState.applyTransform(localToBorderBoxTransform());

    RenderBox::mapLocalToContainer(repaintContainer, fixed, useTransforms, transformState);

}

bool RenderSVGRoot::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int _x, int _y, int _tx, int _ty, HitTestAction hitTestAction)

{

    IntPoint pointInContainer(_x, _y);

    IntSize containerToParentOffset(_tx, _ty);

    IntPoint pointInParent = pointInContainer - containerToParentOffset;

    IntPoint pointInBorderBox = pointInParent - parentOriginToBorderBox();

    // Note: For now, we're ignoring hits to border and padding for <svg>

    IntPoint pointInContentBox = pointInBorderBox - borderOriginToContentBox();

    if (!contentBoxRect().contains(pointInContentBox))

        return false;

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

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

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

            // FIXME: CSS/HTML assumes the local point is relative to the border box, right?

            updateHitTestResult(result, pointInBorderBox);

            // FIXME: nodeAtFloatPoint() doesn't handle rect-based hit tests yet.

            result.addNodeToRectBasedTestResult(child->node(), _x, _y);

            return true;

        }

    }

    // Spec: Only graphical elements can be targeted by the mouse, so we don't check self here.

    // 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)