gecko/layout/svg/base/src/nsSVGMarkerFrame.h

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#ifndef __NS_SVGMARKERFRAME_H__
#define __NS_SVGMARKERFRAME_H__

#include "nsSVGContainerFrame.h"

class gfxContext;
class nsSVGPathGeometryFrame;
class nsIURI;
class nsIContent;
struct nsSVGMark;

typedef nsSVGContainerFrame nsSVGMarkerFrameBase;

class nsSVGMarkerFrame : public nsSVGMarkerFrameBase
{
  friend nsIFrame*
  NS_NewSVGMarkerFrame(nsIPresShell* aPresShell, nsIContent* aContent, nsStyleContext* aContext);
protected:
  nsSVGMarkerFrame(nsStyleContext* aContext) :
    nsSVGMarkerFrameBase(aContext),
    mMarkedFrame(nsnull),
    mInUse(PR_FALSE),
    mInUse2(PR_FALSE) {}

public:
  // nsIFrame interface:
  NS_IMETHOD AttributeChanged(PRInt32         aNameSpaceID,
                              nsIAtom*        aAttribute,
                              PRInt32         aModType);
  /**
   * Get the "type" of the frame
   *
   * @see nsGkAtoms::svgMarkerFrame
   */
  virtual nsIAtom* GetType() const;

#ifdef DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const
  {
    return MakeFrameName(NS_LITERAL_STRING("SVGMarker"), aResult);
  }
#endif

  // nsSVGMarkerFrame methods:
  nsresult PaintMark(nsSVGRenderState *aContext,
                     nsSVGPathGeometryFrame *aMarkedFrame,
                     nsSVGMark *aMark,
                     float aStrokeWidth);

  nsRect RegionMark(nsSVGPathGeometryFrame *aMarkedFrame,
                    const nsSVGMark *aMark, float aStrokeWidth);

private:
  // stuff needed for callback
  nsSVGPathGeometryFrame *mMarkedFrame;
  float mStrokeWidth, mX, mY, mAngle;

  // nsSVGContainerFrame methods:
  virtual already_AddRefed<nsIDOMSVGMatrix> GetCanvasTM();

  // VC6 does not allow the inner class to access protected members
  // of the outer class
  class AutoMarkerReferencer;
  friend class AutoMarkerReferencer;

  // A helper class to allow us to paint markers safely. The helper
  // automatically sets and clears the mInUse flag on the marker frame (to
  // prevent nasty reference loops) as well as the reference to the marked
  // frame and its coordinate context. It's easy to mess this up
  // and break things, so this helper makes the code far more robust.
  class AutoMarkerReferencer
  {
  public:
    AutoMarkerReferencer(nsSVGMarkerFrame *aFrame,
                         nsSVGPathGeometryFrame *aMarkedFrame);
    ~AutoMarkerReferencer();
  private:
    nsSVGMarkerFrame *mFrame;
  };

  // nsSVGMarkerFrame methods:
  void SetParentCoordCtxProvider(nsSVGSVGElement *aContext);

  // recursion prevention flag
  PRPackedBool mInUse;

  // second recursion prevention flag, for GetCanvasTM()
  PRPackedBool mInUse2;
};

#endif