gecko/layout/svg/nsSVGPathGeometryFrame.h

/* -*- 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_SVGPATHGEOMETRYFRAME_H__
#define __NS_SVGPATHGEOMETRYFRAME_H__

#include "mozilla/Attributes.h"
#include "gfxMatrix.h"
#include "gfxRect.h"
#include "nsFrame.h"
#include "nsISVGChildFrame.h"
#include "nsLiteralString.h"
#include "nsQueryFrame.h"
#include "nsRect.h"
#include "nsSVGGeometryFrame.h"
#include "nsSVGUtils.h"

class gfxContext;
class nsDisplaySVGPathGeometry;
class nsIAtom;
class nsIFrame;
class nsIPresShell;
class nsRenderingContext;
class nsStyleContext;
class nsSVGMarkerFrame;
class nsSVGMarkerProperty;

struct nsPoint;

typedef nsSVGGeometryFrame nsSVGPathGeometryFrameBase;

class nsSVGPathGeometryFrame : public nsSVGPathGeometryFrameBase,
                               public nsISVGChildFrame
{
  friend nsIFrame*
  NS_NewSVGPathGeometryFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);

  friend class nsDisplaySVGPathGeometry;

protected:
  nsSVGPathGeometryFrame(nsStyleContext* aContext)
    : nsSVGPathGeometryFrameBase(aContext)
  {
     AddStateBits(NS_FRAME_MAY_BE_TRANSFORMED);
  }

public:
  NS_DECL_QUERYFRAME
  NS_DECL_FRAMEARENA_HELPERS

  // nsIFrame interface:
  NS_IMETHOD  AttributeChanged(int32_t         aNameSpaceID,
                               nsIAtom*        aAttribute,
                               int32_t         aModType);

  virtual void DidSetStyleContext(nsStyleContext* aOldStyleContext);

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

  virtual bool IsSVGTransformed(gfxMatrix *aOwnTransforms = nullptr,
                                gfxMatrix *aFromParentTransforms = nullptr) const;

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

  NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                              const nsRect&           aDirtyRect,
                              const nsDisplayListSet& aLists);

  // nsSVGGeometryFrame methods
  gfxMatrix GetCanvasTM(uint32_t aFor);

protected:
  // nsISVGChildFrame interface:
  NS_IMETHOD PaintSVG(nsRenderingContext *aContext,
                      const nsIntRect *aDirtyRect);
  NS_IMETHOD_(nsIFrame*) GetFrameForPoint(const nsPoint &aPoint) MOZ_OVERRIDE;
  NS_IMETHOD_(nsRect) GetCoveredRegion() MOZ_OVERRIDE;
  virtual void ReflowSVG() MOZ_OVERRIDE;
  virtual void NotifySVGChanged(uint32_t aFlags) MOZ_OVERRIDE;
  virtual SVGBBox GetBBoxContribution(const gfxMatrix &aToBBoxUserspace,
                                      uint32_t aFlags) MOZ_OVERRIDE;
  NS_IMETHOD_(bool) IsDisplayContainer() MOZ_OVERRIDE { return false; }

protected:
  void GeneratePath(gfxContext *aContext, const gfxMatrix &aTransform);

private:
  void Render(nsRenderingContext *aContext);

  struct MarkerProperties {
    nsSVGMarkerProperty* mMarkerStart;
    nsSVGMarkerProperty* mMarkerMid;
    nsSVGMarkerProperty* mMarkerEnd;

    bool MarkersExist() const {
      return mMarkerStart || mMarkerMid || mMarkerEnd;
    }

    nsSVGMarkerFrame *GetMarkerStartFrame();
    nsSVGMarkerFrame *GetMarkerMidFrame();
    nsSVGMarkerFrame *GetMarkerEndFrame();
  };

  /**
   * @param aFrame should be the first continuation
   */
  static MarkerProperties GetMarkerProperties(nsSVGPathGeometryFrame *aFrame);
};

#endif // __NS_SVGPATHGEOMETRYFRAME_H__