gecko-dev/layout/svg/nsSVGMaskFrame.h

100 lines
2.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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_SVGMASKFRAME_H__
#define __NS_SVGMASKFRAME_H__
#include "mozilla/Attributes.h"
#include "gfxPattern.h"
#include "gfxMatrix.h"
#include "nsSVGContainerFrame.h"
#include "nsSVGUtils.h"
class gfxContext;
class nsRenderingContext;
typedef nsSVGContainerFrame nsSVGMaskFrameBase;
class nsSVGMaskFrame : public nsSVGMaskFrameBase
{
friend nsIFrame*
NS_NewSVGMaskFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
protected:
nsSVGMaskFrame(nsStyleContext* aContext)
: nsSVGMaskFrameBase(aContext)
, mInUse(false)
{
AddStateBits(NS_FRAME_IS_NONDISPLAY);
}
public:
NS_DECL_FRAMEARENA_HELPERS
// nsSVGMaskFrame method:
already_AddRefed<gfxPattern> ComputeMaskAlpha(nsRenderingContext *aContext,
nsIFrame* aParent,
const gfxMatrix &aMatrix,
float aOpacity = 1.0f);
NS_IMETHOD AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType) MOZ_OVERRIDE;
#ifdef DEBUG
virtual void Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow) MOZ_OVERRIDE;
#endif
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists) MOZ_OVERRIDE {}
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::svgMaskFrame
*/
virtual nsIAtom* GetType() const MOZ_OVERRIDE;
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const MOZ_OVERRIDE
{
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 = true;
}
~AutoMaskReferencer() {
mFrame->mInUse = false;
}
private:
nsSVGMaskFrame *mFrame;
};
nsIFrame *mMaskParent;
nsAutoPtr<gfxMatrix> mMaskParentMatrix;
// recursion prevention flag
bool mInUse;
// nsSVGContainerFrame methods:
virtual gfxMatrix GetCanvasTM(uint32_t aFor,
nsIFrame* aTransformRoot = nullptr) MOZ_OVERRIDE;
};
#endif