gecko-dev/layout/svg/SVGGeometryFrame.h

/* -*- 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 __SVGGEOMETRYFRAME_H__
#define __SVGGEOMETRYFRAME_H__

#include "mozilla/Attributes.h"
#include "gfxMatrix.h"
#include "gfxRect.h"
#include "nsFrame.h"
#include "nsSVGDisplayableFrame.h"
#include "nsLiteralString.h"
#include "nsQueryFrame.h"
#include "nsSVGUtils.h"

namespace mozilla {
class SVGGeometryFrame;
class SVGMarkerObserver;
namespace gfx {
class DrawTarget;
}  // namespace gfx
}  // namespace mozilla

class gfxContext;
class nsDisplaySVGGeometry;
class nsAtom;
class nsIFrame;
class nsSVGMarkerFrame;

struct nsRect;

namespace mozilla {
class PresShell;
}  // namespace mozilla

nsIFrame* NS_NewSVGGeometryFrame(mozilla::PresShell* aPresShell,
                                 mozilla::ComputedStyle* aStyle);

namespace mozilla {

class SVGGeometryFrame : public nsFrame, public nsSVGDisplayableFrame {
  typedef mozilla::gfx::DrawTarget DrawTarget;

  friend nsIFrame* ::NS_NewSVGGeometryFrame(mozilla::PresShell* aPresShell,
                                            ComputedStyle* aStyle);

  friend class ::nsDisplaySVGGeometry;

 protected:
  SVGGeometryFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
                   nsIFrame::ClassID aID = kClassID)
      : nsFrame(aStyle, aPresContext, aID) {
    AddStateBits(NS_FRAME_SVG_LAYOUT | NS_FRAME_MAY_BE_TRANSFORMED);
  }

 public:
  NS_DECL_QUERYFRAME
  NS_DECL_FRAMEARENA_HELPERS(SVGGeometryFrame)

  // nsIFrame interface:
  virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,
                    nsIFrame* aPrevInFlow) override;

  virtual bool IsFrameOfType(uint32_t aFlags) const override {
    if (aFlags & eSupportsContainLayoutAndPaint) {
      return false;
    }

    return nsFrame::IsFrameOfType(aFlags &
                                  ~(nsIFrame::eSVG | nsIFrame::eSVGGeometry));
  }

  virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
                                    int32_t aModType) override;

  virtual void DidSetComputedStyle(ComputedStyle* aOldComputedStyle) override;

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

#ifdef DEBUG_FRAME_DUMP
  virtual nsresult GetFrameName(nsAString& aResult) const override {
    return MakeFrameName(NS_LITERAL_STRING("SVGGeometry"), aResult);
  }
#endif

  virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,
                                const nsDisplayListSet& aLists) override;

  // SVGGeometryFrame methods
  gfxMatrix GetCanvasTM();

 protected:
  // nsSVGDisplayableFrame interface:
  virtual void PaintSVG(gfxContext& aContext, const gfxMatrix& aTransform,
                        imgDrawingParams& aImgParams,
                        const nsIntRect* aDirtyRect = nullptr) override;
  virtual nsIFrame* GetFrameForPoint(const gfxPoint& aPoint) override;
  virtual void ReflowSVG() override;
  virtual void NotifySVGChanged(uint32_t aFlags) override;
  virtual SVGBBox GetBBoxContribution(const Matrix& aToBBoxUserspace,
                                      uint32_t aFlags) override;
  virtual bool IsDisplayContainer() override { return false; }

  /**
   * This function returns a set of bit flags indicating which parts of the
   * element (fill, stroke, bounds) should intercept pointer events. It takes
   * into account the type of element and the value of the 'pointer-events'
   * property on the element.
   */
  virtual uint16_t GetHitTestFlags();

 private:
  enum { eRenderFill = 1, eRenderStroke = 2 };
  void Render(gfxContext* aContext, uint32_t aRenderComponents,
              const gfxMatrix& aTransform, imgDrawingParams& aImgParams);

  /**
   * @param aMatrix The transform that must be multiplied onto aContext to
   *   establish this frame's SVG user space.
   */
  void PaintMarkers(gfxContext& aContext, const gfxMatrix& aTransform,
                    imgDrawingParams& aImgParams);
};
}  // namespace mozilla

#endif  // __SVGGEOMETRYFRAME_H__