gecko-dev/layout/svg/nsSVGImageFrame.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_SVGIMAGEFRAME_H__
#define __NS_SVGIMAGEFRAME_H__

// Keep in (case-insensitive) order:
#include "gfxContext.h"
#include "gfxPlatform.h"
#include "mozilla/gfx/2D.h"
#include "imgIContainer.h"
#include "nsContainerFrame.h"
#include "nsIDOMMutationEvent.h"
#include "nsIImageLoadingContent.h"
#include "nsLayoutUtils.h"
#include "imgINotificationObserver.h"
#include "SVGObserverUtils.h"
#include "mozilla/dom/SVGSVGElement.h"
#include "nsSVGUtils.h"
#include "SVGContentUtils.h"
#include "SVGGeometryFrame.h"
#include "SVGImageContext.h"
#include "mozilla/dom/SVGImageElement.h"
#include "nsContentUtils.h"
#include "nsIReflowCallback.h"
#include "mozilla/Unused.h"

using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::image;

class nsSVGImageFrame;

class nsSVGImageListener final : public imgINotificationObserver
{
public:
  explicit nsSVGImageListener(nsSVGImageFrame *aFrame);

  NS_DECL_ISUPPORTS
  NS_DECL_IMGINOTIFICATIONOBSERVER

  void SetFrame(nsSVGImageFrame *frame) { mFrame = frame; }

private:
  ~nsSVGImageListener() {}

  nsSVGImageFrame *mFrame;
};

class nsSVGImageFrame final
  : public SVGGeometryFrame
  , public nsIReflowCallback
{
  friend nsIFrame*
  NS_NewSVGImageFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);

protected:
  explicit nsSVGImageFrame(nsStyleContext* aContext)
    : SVGGeometryFrame(aContext, kClassID)
    , mReflowCallbackPosted(false)
    , mForceSyncDecoding(false)
  {
    EnableVisibilityTracking();
  }

  virtual ~nsSVGImageFrame();

public:
  NS_DECL_QUERYFRAME
  NS_DECL_FRAMEARENA_HELPERS(nsSVGImageFrame)

  // 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;

  // SVGGeometryFrame methods:
  virtual uint16_t GetHitTestFlags() override;

  // nsIFrame interface:
  virtual nsresult  AttributeChanged(int32_t         aNameSpaceID,
                                     nsIAtom*        aAttribute,
                                     int32_t         aModType) override;

  void OnVisibilityChange(Visibility aNewVisibility,
                          const Maybe<OnNonvisible>& aNonvisibleAction = Nothing()) override;

  virtual void Init(nsIContent*       aContent,
                    nsContainerFrame* aParent,
                    nsIFrame*         aPrevInFlow) override;
  virtual void DestroyFrom(nsIFrame* aDestructRoot) override;

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

  // nsIReflowCallback
  virtual bool ReflowFinished() override;
  virtual void ReflowCallbackCanceled() override;

  /// Always sync decode our image when painting if @aForce is true.
  void SetForceSyncDecoding(bool aForce) { mForceSyncDecoding = aForce; }

private:
  gfx::Matrix GetRasterImageTransform(int32_t aNativeWidth,
                                      int32_t aNativeHeight);
  gfx::Matrix GetVectorImageTransform();
  bool TransformContextForPainting(gfxContext* aGfxContext,
                                   const gfxMatrix& aTransform);

  nsCOMPtr<imgINotificationObserver> mListener;

  nsCOMPtr<imgIContainer> mImageContainer;

  bool mReflowCallbackPosted;
  bool mForceSyncDecoding;

  friend class nsSVGImageListener;
};

#endif // __NS_SVGIMAGEFRAME_H__