gecko-dev/layout/svg/nsSVGMarkerFrame.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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_SVGMARKERFRAME_H__
#define __NS_SVGMARKERFRAME_H__
#include "mozilla/Attributes.h"
#include "gfxMatrix.h"
#include "gfxRect.h"
#include "nsFrame.h"
#include "nsLiteralString.h"
#include "nsQueryFrame.h"
#include "nsSVGContainerFrame.h"
#include "nsSVGUtils.h"
class gfxContext;
namespace mozilla {
class PresShell;
class SVGGeometryFrame;
struct SVGMark;
namespace dom {
class SVGViewportElement;
} // namespace dom
} // namespace mozilla
class nsSVGMarkerFrame final : public nsSVGContainerFrame {
typedef mozilla::SVGMark SVGMark;
typedef mozilla::image::imgDrawingParams imgDrawingParams;
friend class nsSVGMarkerAnonChildFrame;
friend nsContainerFrame* NS_NewSVGMarkerFrame(mozilla::PresShell* aPresShell,
ComputedStyle* aStyle);
protected:
explicit nsSVGMarkerFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
: nsSVGContainerFrame(aStyle, aPresContext, kClassID),
mMarkedFrame(nullptr),
mInUse(false),
mInUse2(false) {
AddStateBits(NS_FRAME_IS_NONDISPLAY);
}
public:
NS_DECL_FRAMEARENA_HELPERS(nsSVGMarkerFrame)
// nsIFrame interface:
#ifdef DEBUG
virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) override;
#endif
virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) override {}
virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
int32_t aModType) override;
#ifdef DEBUG_FRAME_DUMP
virtual nsresult GetFrameName(nsAString& aResult) const override {
return MakeFrameName(NS_LITERAL_STRING("SVGMarker"), aResult);
}
#endif
virtual nsContainerFrame* GetContentInsertionFrame() override {
// Any children must be added to our single anonymous inner frame kid.
MOZ_ASSERT(
PrincipalChildList().FirstChild() &&
PrincipalChildList().FirstChild()->IsSVGMarkerAnonChildFrame(),
"Where is our anonymous child?");
return PrincipalChildList().FirstChild()->GetContentInsertionFrame();
}
// nsSVGMarkerFrame methods:
void PaintMark(gfxContext& aContext, const gfxMatrix& aToMarkedFrameUserSpace,
mozilla::SVGGeometryFrame* aMarkedFrame, const SVGMark& aMark,
float aStrokeWidth, imgDrawingParams& aImgParams);
SVGBBox GetMarkBBoxContribution(const Matrix& aToBBoxUserspace,
uint32_t aFlags,
mozilla::SVGGeometryFrame* aMarkedFrame,
const SVGMark& aMark, float aStrokeWidth);
// Return our anonymous box child.
void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) override;
private:
// stuff needed for callback
mozilla::SVGGeometryFrame* mMarkedFrame;
Matrix mMarkerTM;
// nsSVGContainerFrame methods:
virtual gfxMatrix GetCanvasTM() override;
// A helper class to allow us to paint markers safely. The helper
// automatically sets and clears the mInUse flag on the marker frame (to
// prevent nasty reference loops) as well as the reference to the marked
// frame and its coordinate context. It's easy to mess this up
// and break things, so this helper makes the code far more robust.
class MOZ_RAII AutoMarkerReferencer {
public:
AutoMarkerReferencer(nsSVGMarkerFrame* aFrame,
mozilla::SVGGeometryFrame* aMarkedFrame
MOZ_GUARD_OBJECT_NOTIFIER_PARAM);
~AutoMarkerReferencer();
private:
nsSVGMarkerFrame* mFrame;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
// nsSVGMarkerFrame methods:
void SetParentCoordCtxProvider(mozilla::dom::SVGViewportElement* aContext);
// recursion prevention flag
bool mInUse;
// second recursion prevention flag, for GetCanvasTM()
bool mInUse2;
};
////////////////////////////////////////////////////////////////////////
// nsMarkerAnonChildFrame class
class nsSVGMarkerAnonChildFrame final : public nsSVGDisplayContainerFrame {
friend nsContainerFrame* NS_NewSVGMarkerAnonChildFrame(
mozilla::PresShell* aPresShell, ComputedStyle* aStyle);
explicit nsSVGMarkerAnonChildFrame(ComputedStyle* aStyle,
nsPresContext* aPresContext)
: nsSVGDisplayContainerFrame(aStyle, aPresContext, kClassID) {}
public:
NS_DECL_FRAMEARENA_HELPERS(nsSVGMarkerAnonChildFrame)
#ifdef DEBUG
virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) override;
#endif
#ifdef DEBUG_FRAME_DUMP
virtual nsresult GetFrameName(nsAString& aResult) const override {
return MakeFrameName(NS_LITERAL_STRING("SVGMarkerAnonChild"), aResult);
}
#endif
// nsSVGContainerFrame methods:
virtual gfxMatrix GetCanvasTM() override {
return static_cast<nsSVGMarkerFrame*>(GetParent())->GetCanvasTM();
}
};
#endif