gecko/layout/svg/nsSVGClipPathFrame.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2012-05-21 04:12:37 -07:00
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef __NS_SVGCLIPPATHFRAME_H__
#define __NS_SVGCLIPPATHFRAME_H__
#include "mozilla/Attributes.h"
#include "gfxMatrix.h"
#include "nsSVGContainerFrame.h"
#include "nsSVGUtils.h"
class nsRenderingContext;
class nsISVGChildFrame;
typedef nsSVGContainerFrame nsSVGClipPathFrameBase;
class nsSVGClipPathFrame : public nsSVGClipPathFrameBase
{
friend nsIFrame*
NS_NewSVGClipPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
protected:
nsSVGClipPathFrame(nsStyleContext* aContext)
: nsSVGClipPathFrameBase(aContext)
, mInUse(false)
{
AddStateBits(NS_FRAME_IS_NONDISPLAY);
}
public:
NS_DECL_FRAMEARENA_HELPERS
// nsIFrame methods:
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists) MOZ_OVERRIDE {}
// nsSVGClipPathFrame methods:
nsresult ClipPaint(nsRenderingContext* aContext,
nsIFrame* aParent,
const gfxMatrix &aMatrix);
bool 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.
bool IsTrivial(nsISVGChildFrame **aSingleChild = nullptr);
bool IsValid();
// nsIFrame interface:
NS_IMETHOD AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType) MOZ_OVERRIDE;
virtual void Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow) MOZ_OVERRIDE;
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::svgClipPathFrame
*/
virtual nsIAtom* GetType() const MOZ_OVERRIDE;
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const MOZ_OVERRIDE
{
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 = true;
}
~AutoClipPathReferencer() {
mFrame->mInUse = false;
}
private:
nsSVGClipPathFrame *mFrame;
};
nsIFrame *mClipParent;
nsAutoPtr<gfxMatrix> mClipParentMatrix;
// recursion prevention flag
bool mInUse;
// nsSVGContainerFrame methods:
virtual gfxMatrix GetCanvasTM(uint32_t aFor,
nsIFrame* aTransformRoot = nullptr) MOZ_OVERRIDE;
};
#endif