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 * Copyright (C) 2020, 2021, 2022 Igalia S.L.
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 * in the documentation and/or other materials provided with the
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 */

#pragma once

#if ENABLE(LAYER_BASED_SVG_ENGINE)
#include "RenderBox.h"
#include "RenderLayerModelObject.h"
#include "SVGBoundingBoxComputation.h"
#include "SVGRenderSupport.h"

namespace WebCore {

// Most renderers in the SVG rendering tree will inherit from this class
// but not all. RenderSVGForeignObject, RenderSVGBlock, etc. inherit from
// existing RenderBlock classes, that all inherit from RenderLayerModelObject
// directly, without RenderSVGModelObject inbetween. Therefore code which
// needs to be shared between all SVG renderers goes to RenderLayerModelObject.
class SVGElement;

class RenderSVGModelObject : public RenderLayerModelObject {
    WTF_MAKE_ISO_ALLOCATED(RenderSVGModelObject);
public:
    bool requiresLayer() const override { return true; }

    void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;

    static bool checkIntersection(RenderElement*, const FloatRect&);
    static bool checkEnclosure(RenderElement*, const FloatRect&);

    inline SVGElement& element() const;

    LayoutRect currentSVGLayoutRect() const { return m_layoutRect; }
    void setCurrentSVGLayoutRect(const LayoutRect& layoutRect) { m_layoutRect = layoutRect; }

    LayoutPoint currentSVGLayoutLocation() const final { return m_layoutRect.location(); }
    void setCurrentSVGLayoutLocation(const LayoutPoint& location) final { m_layoutRect.setLocation(location); }

    // Mimic the RenderBox accessors - by sharing the same terminology the painting / hit testing / layout logic is
    // similar to read compared to non-SVG renderers such as RenderBox & friends.
    LayoutRect borderBoxRectEquivalent() const { return { LayoutPoint(), m_layoutRect.size() }; }
    LayoutRect contentBoxRectEquivalent() const { return borderBoxRectEquivalent(); }
    LayoutRect frameRectEquivalent() const { return m_layoutRect; }
    LayoutRect visualOverflowRectEquivalent() const { return SVGBoundingBoxComputation::computeVisualOverflowRect(*this); }
    LayoutSize locationOffsetEquivalent() const { return toLayoutSize(currentSVGLayoutLocation()); }

    bool hasVisualOverflow() const { return !borderBoxRectEquivalent().contains(visualOverflowRectEquivalent()); }

    // For RenderLayer only
    void applyTopLeftLocationOffsetEquivalent(LayoutPoint& point) const { point.moveBy(currentSVGLayoutLocation()); }
    LayoutRect borderBoxRectInFragmentEquivalent(RenderFragmentContainer*, RenderBox::RenderBoxFragmentInfoFlags = RenderBox::CacheRenderBoxFragmentInfo) const { return borderBoxRectEquivalent(); }
    virtual LayoutRect overflowClipRect(const LayoutPoint& location, RenderFragmentContainer* = nullptr, OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize, PaintPhase = PaintPhase::BlockBackground) const;
    LayoutRect overflowClipRectForChildLayers(const LayoutPoint& location, RenderFragmentContainer* fragment, OverlayScrollbarSizeRelevancy relevancy) { return overflowClipRect(location, fragment, relevancy); }

protected:
    RenderSVGModelObject(Document&, RenderStyle&&);
    RenderSVGModelObject(SVGElement&, RenderStyle&&);

    void willBeDestroyed() override;
    void updateFromStyle() override;
    bool shouldPaintSVGRenderer(const PaintInfo&) const;

    LayoutRect clippedOverflowRect(const RenderLayerModelObject* repaintContainer, VisibleRectContext) const override;
    std::optional<LayoutRect> computeVisibleRectInContainer(const LayoutRect&, const RenderLayerModelObject* container, VisibleRectContext) const final;
    void mapAbsoluteToLocalPoint(OptionSet<MapCoordinatesMode>, TransformState&) const override;
    void mapLocalToContainer(const RenderLayerModelObject* ancestorContainer, TransformState&, OptionSet<MapCoordinatesMode>, bool* wasFixed) const final;
    LayoutRect outlineBoundsForRepaint(const RenderLayerModelObject* repaintContainer, const RenderGeometryMap*) const final;
    const RenderObject* pushMappingToContainer(const RenderLayerModelObject*, RenderGeometryMap&) const override;
    LayoutSize offsetFromContainer(RenderElement&, const LayoutPoint&, bool* offsetDependsOnPoint = nullptr) const override;

    void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const override;
    void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const override;

    void addFocusRingRects(Vector<LayoutRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer = 0) override;
    // FIXME: [LBSE] Upstream SVG outline painting functionality
    // void paintSVGOutline(PaintInfo&, const LayoutPoint& adjustedPaintOffset);

    // Returns false if the rect has no intersection with the applied clip rect. When the context specifies edge-inclusive
    // intersection, this return value allows distinguishing between no intersection and zero-area intersection.
    bool applyCachedClipAndScrollPosition(LayoutRect&, const RenderLayerModelObject* container, VisibleRectContext) const final;

private:
    bool isRenderSVGModelObject() const final { return true; }
    LayoutSize cachedSizeForOverflowClip() const;

    LayoutRect m_layoutRect;
};

} // namespace WebCore

SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderSVGModelObject, isRenderSVGModelObject())

#endif // ENABLE(LAYER_BASED_SVG_ENGINE)
