layout/svg/base/src/nsSVGMaskFrame.h
author Brian Birtles <birtles@gmail.com>
Sun, 25 Sep 2011 22:04:32 +0100
changeset 77557 c9a9397f6db3e27cff0cf5ba8ed1fa4c3b9d85c2
parent 77132 c6d4e5bce80b58d9544405f88b2d9292a75c1ec1
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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 * The Original Code is the Mozilla SVG project.
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#ifndef __NS_SVGMASKFRAME_H__
#define __NS_SVGMASKFRAME_H__

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

class gfxContext;

typedef nsSVGContainerFrame nsSVGMaskFrameBase;

class nsSVGMaskFrame : public nsSVGMaskFrameBase
{
  friend nsIFrame*
  NS_NewSVGMaskFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
protected:
  nsSVGMaskFrame(nsStyleContext* aContext) :
    nsSVGMaskFrameBase(aContext),
    mInUse(PR_FALSE) {}

public:
  NS_DECL_FRAMEARENA_HELPERS

  // nsSVGMaskFrame method:
  already_AddRefed<gfxPattern> ComputeMaskAlpha(nsSVGRenderState *aContext,
                                                nsIFrame* aParent,
                                                const gfxMatrix &aMatrix,
                                                float aOpacity = 1.0f);

  NS_IMETHOD AttributeChanged(PRInt32         aNameSpaceID,
                              nsIAtom*        aAttribute,
                              PRInt32         aModType);

#ifdef DEBUG
  NS_IMETHOD Init(nsIContent*      aContent,
                  nsIFrame*        aParent,
                  nsIFrame*        aPrevInFlow);
#endif

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

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

private:
  // A helper class to allow us to paint masks safely. The helper
  // automatically sets and clears the mInUse flag on the mask 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 AutoMaskReferencer
  {
  public:
    AutoMaskReferencer(nsSVGMaskFrame *aFrame)
       : mFrame(aFrame) {
      NS_ASSERTION(!mFrame->mInUse, "reference loop!");
      mFrame->mInUse = PR_TRUE;
    }
    ~AutoMaskReferencer() {
      mFrame->mInUse = PR_FALSE;
    }
  private:
    nsSVGMaskFrame *mFrame;
  };

  nsIFrame *mMaskParent;
  nsAutoPtr<gfxMatrix> mMaskParentMatrix;
  // recursion prevention flag
  PRPackedBool mInUse;

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

#endif