зеркало из https://github.com/mozilla/gecko-dev.git
112 строки
3.4 KiB
C++
112 строки
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __NS_SVGCLIPPATHFRAME_H__
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#define __NS_SVGCLIPPATHFRAME_H__
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#include "mozilla/Attributes.h"
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#include "gfxMatrix.h"
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#include "nsSVGContainerFrame.h"
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#include "nsSVGUtils.h"
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class nsRenderingContext;
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class nsISVGChildFrame;
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typedef nsSVGContainerFrame nsSVGClipPathFrameBase;
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class nsSVGClipPathFrame : public nsSVGClipPathFrameBase
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{
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friend nsIFrame*
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NS_NewSVGClipPathFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
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protected:
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nsSVGClipPathFrame(nsStyleContext* aContext)
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: nsSVGClipPathFrameBase(aContext)
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, mInUse(false)
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{
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AddStateBits(NS_FRAME_IS_NONDISPLAY);
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}
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public:
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NS_DECL_FRAMEARENA_HELPERS
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// nsIFrame methods:
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virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists) MOZ_OVERRIDE {}
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// nsSVGClipPathFrame methods:
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nsresult ClipPaint(nsRenderingContext* aContext,
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nsIFrame* aParent,
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const gfxMatrix &aMatrix);
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bool ClipHitTest(nsIFrame* aParent,
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const gfxMatrix &aMatrix,
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const nsPoint &aPoint);
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// Check if this clipPath is made up of more than one geometry object.
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// If so, the clipping API in cairo isn't enough and we need to use
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// mask based clipping.
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bool IsTrivial(nsISVGChildFrame **aSingleChild = nullptr);
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bool IsValid();
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// nsIFrame interface:
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NS_IMETHOD AttributeChanged(int32_t aNameSpaceID,
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nsIAtom* aAttribute,
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int32_t aModType) MOZ_OVERRIDE;
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virtual void Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow) MOZ_OVERRIDE;
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/**
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* Get the "type" of the frame
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*
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* @see nsGkAtoms::svgClipPathFrame
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*/
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virtual nsIAtom* GetType() const MOZ_OVERRIDE;
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#ifdef DEBUG
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NS_IMETHOD GetFrameName(nsAString& aResult) const MOZ_OVERRIDE
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{
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return MakeFrameName(NS_LITERAL_STRING("SVGClipPath"), aResult);
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}
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#endif
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private:
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// A helper class to allow us to paint clip paths safely. The helper
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// automatically sets and clears the mInUse flag on the clip path frame
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// (to prevent nasty reference loops). It's easy to mess this up
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// and break things, so this helper makes the code far more robust.
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class MOZ_STACK_CLASS AutoClipPathReferencer
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{
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public:
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AutoClipPathReferencer(nsSVGClipPathFrame *aFrame
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MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
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: mFrame(aFrame) {
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MOZ_GUARD_OBJECT_NOTIFIER_INIT;
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NS_ASSERTION(!mFrame->mInUse, "reference loop!");
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mFrame->mInUse = true;
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}
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~AutoClipPathReferencer() {
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mFrame->mInUse = false;
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}
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private:
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nsSVGClipPathFrame *mFrame;
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MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
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};
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nsIFrame *mClipParent;
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nsAutoPtr<gfxMatrix> mClipParentMatrix;
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// recursion prevention flag
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bool mInUse;
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// nsSVGContainerFrame methods:
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virtual gfxMatrix GetCanvasTM(uint32_t aFor,
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nsIFrame* aTransformRoot = nullptr) MOZ_OVERRIDE;
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};
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#endif
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