gecko-dev/layout/generic/nsVideoFrame.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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/. */

/* rendering object for the HTML <video> element */

#ifndef nsVideoFrame_h___
#define nsVideoFrame_h___

#include "mozilla/Attributes.h"
#include "nsContainerFrame.h"
#include "nsIAnonymousContentCreator.h"
#include "FrameLayerBuilder.h"

namespace mozilla {
namespace layers {
class Layer;
class LayerManager;
}
}

class nsAString;
class nsPresContext;
class nsDisplayItem;
template <class T> class nsTArray;

nsIFrame* NS_NewVideoFrame (nsIPresShell* aPresShell, nsStyleContext* aContext);

class nsVideoFrame : public nsContainerFrame, public nsIAnonymousContentCreator
{
public:
  typedef mozilla::layers::Layer Layer;
  typedef mozilla::layers::LayerManager LayerManager;
  typedef mozilla::ContainerLayerParameters ContainerLayerParameters;

  nsVideoFrame(nsStyleContext* aContext);

  NS_DECL_QUERYFRAME
  NS_DECL_QUERYFRAME_TARGET(nsVideoFrame)
  NS_DECL_FRAMEARENA_HELPERS

  virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                const nsRect&           aDirtyRect,
                                const nsDisplayListSet& aLists) MOZ_OVERRIDE;

  NS_IMETHOD AttributeChanged(int32_t aNameSpaceID,
                              nsIAtom* aAttribute,
                              int32_t aModType) MOZ_OVERRIDE;

  /* get the size of the video's display */
  nsSize GetVideoIntrinsicSize(nsRenderingContext *aRenderingContext);
  virtual nsSize GetIntrinsicRatio() MOZ_OVERRIDE;
  virtual nsSize ComputeSize(nsRenderingContext *aRenderingContext,
                             nsSize aCBSize, nscoord aAvailableWidth,
                             nsSize aMargin, nsSize aBorder, nsSize aPadding,
                             uint32_t aFlags) MOZ_OVERRIDE;
  virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
  virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
  virtual void DestroyFrom(nsIFrame* aDestructRoot) MOZ_OVERRIDE;
  virtual bool IsLeaf() const MOZ_OVERRIDE;

  NS_IMETHOD Reflow(nsPresContext*          aPresContext,
                    nsHTMLReflowMetrics&     aDesiredSize,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus&          aStatus) MOZ_OVERRIDE;

#ifdef ACCESSIBILITY
  virtual mozilla::a11y::AccType AccessibleType() MOZ_OVERRIDE;
#endif

  virtual nsIAtom* GetType() const MOZ_OVERRIDE;

  virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE
  {
    return nsSplittableFrame::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced));
  }
  
  virtual nsresult CreateAnonymousContent(nsTArray<ContentInfo>& aElements) MOZ_OVERRIDE;
  virtual void AppendAnonymousContentTo(nsBaseContentList& aElements,
                                        uint32_t aFilters) MOZ_OVERRIDE;

  nsIContent* GetPosterImage() { return mPosterImage; }

  // Returns true if we should display the poster. Note that once we show
  // a video frame, the poster will never be displayed again.
  bool ShouldDisplayPoster();

  nsIContent *GetCaptionOverlay() { return mCaptionDiv; }

#ifdef DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const MOZ_OVERRIDE;
#endif

  already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
                                     LayerManager* aManager,
                                     nsDisplayItem* aItem,
                                     const ContainerLayerParameters& aContainerParameters);

protected:

  // Returns true if we're rendering for a video element. We still create
  // nsVideoFrame to render controls for an audio element.
  bool HasVideoElement();

  // Returns true if there is video data to render. Can return false
  // when we're the frame for an audio element, or we've created a video
  // element for a media which is audio-only.
  bool HasVideoData();

  // Sets the mPosterImage's src attribute to be the video's poster attribute,
  // if we're the frame for a video element. Only call on frames for video
  // elements, not for frames for audio elements.
  nsresult UpdatePosterSource(bool aNotify);

  virtual ~nsVideoFrame();

  nsMargin mBorderPadding;

  // Anonymous child which is bound via XBL to the video controls.
  nsCOMPtr<nsIContent> mVideoControls;

  // Anonymous child which is the image element of the poster frame.
  nsCOMPtr<nsIContent> mPosterImage;

  // Anonymous child which is the text track caption display div.
  nsCOMPtr<nsIContent> mCaptionDiv;

};

#endif /* nsVideoFrame_h___ */