layout/svg/base/src/nsSVGClipPathFrame.h
author Brian Birtles <birtles@gmail.com>
Sun, 25 Sep 2011 22:04:32 +0100
changeset 77557 c9a9397f6db3e27cff0cf5ba8ed1fa4c3b9d85c2
parent 58894 395fac6a7de431827a5254d47ed92c5dafa8b489
child 77799 e7854b4d29ba905ae3994f821b160c989bac4260
permissions -rw-r--r--
Bug 602759 part 13 - Update layout to use new matrix and transform types; r=jwatt

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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#ifndef __NS_SVGCLIPPATHFRAME_H__
#define __NS_SVGCLIPPATHFRAME_H__

#include "nsSVGContainerFrame.h"
#include "gfxMatrix.h"

typedef nsSVGContainerFrame nsSVGClipPathFrameBase;

class nsSVGClipPathFrame : public nsSVGClipPathFrameBase
{
  friend nsIFrame*
  NS_NewSVGClipPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
protected:
  nsSVGClipPathFrame(nsStyleContext* aContext) :
    nsSVGClipPathFrameBase(aContext),
    mInUse(PR_FALSE) {}

public:
  NS_DECL_FRAMEARENA_HELPERS

  // nsSVGClipPathFrame methods:
  nsresult ClipPaint(nsSVGRenderState* aContext,
                     nsIFrame* aParent,
                     const gfxMatrix &aMatrix);

  PRBool ClipHitTest(nsIFrame* aParent,
                     const gfxMatrix &aMatrix,
                     const nsPoint &aPoint);

  // Check if this clipPath is made up of more than one geometry object.
  // If so, the clipping API in cairo isn't enough and we need to use
  // mask based clipping.
  PRBool IsTrivial();

  PRBool IsValid();

  // nsIFrame interface:
  NS_IMETHOD AttributeChanged(PRInt32         aNameSpaceID,
                              nsIAtom*        aAttribute,
                              PRInt32         aModType);

  NS_IMETHOD Init(nsIContent*      aContent,
                  nsIFrame*        aParent,
                  nsIFrame*        aPrevInFlow);

  /**
   * Get the "type" of the frame
   *
   * @see nsGkAtoms::svgClipPathFrame
   */
  virtual nsIAtom* GetType() const;

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

 private:
  // A helper class to allow us to paint clip paths safely. The helper
  // automatically sets and clears the mInUse flag on the clip path frame
  // (to prevent nasty reference loops). It's easy to mess this up
  // and break things, so this helper makes the code far more robust.
  class AutoClipPathReferencer
  {
  public:
    AutoClipPathReferencer(nsSVGClipPathFrame *aFrame)
       : mFrame(aFrame) {
      NS_ASSERTION(!mFrame->mInUse, "reference loop!");
      mFrame->mInUse = PR_TRUE;
    }
    ~AutoClipPathReferencer() {
      mFrame->mInUse = PR_FALSE;
    }
  private:
    nsSVGClipPathFrame *mFrame;
  };

  nsIFrame *mClipParent;
  nsAutoPtr<gfxMatrix> mClipParentMatrix;
  // recursion prevention flag
  PRPackedBool mInUse;

  // nsSVGContainerFrame methods:
  virtual gfxMatrix GetCanvasTM();
};

#endif