author L. David Baron <>
Sat, 13 Sep 2014 06:17:36 -0700
changeset 228423 c81eb3a1336b2ab5f4e83b8b5df394dfea8be37e
parent 224484 9d4e083655b993f73ba3eca84e0f14cdd270bcda
permissions -rw-r--r--
Bug 977991 patch 1 - Expose variant of RulesMatching on nsHTMLCSSStyleSheet that is less work to call. r=birtles This allows nsStyleSet::RuleNodeWithReplacement to call it without constructing an entire (and unnecessary) ElementRuleProcessorData, which will happen in patch 3.

/* -*- 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 */

/* rendering objects for replaced elements implemented by a plugin */

#ifndef nsObjectFrame_h___
#define nsObjectFrame_h___

#include "mozilla/Attributes.h"
#include "nsIObjectFrame.h"
#include "nsFrame.h"
#include "nsRegion.h"
#include "nsDisplayList.h"
#include "nsIReflowCallback.h"

#ifdef XP_WIN
#include <windows.h> // For HWND :(
// Undo the windows.h damage
#undef GetMessage
#undef CreateEvent
#undef GetClassName
#undef GetBinaryType
#undef RemoveDirectory

class nsPresContext;
class nsRootPresContext;
class nsDisplayPlugin;
class nsIOSurface;
class PluginBackgroundSink;
class nsPluginInstanceOwner;

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

typedef nsFrame nsObjectFrameSuper;

class nsObjectFrame : public nsObjectFrameSuper,
                      public nsIObjectFrame,
                      public nsIReflowCallback {
  typedef mozilla::LayerState LayerState;
  typedef mozilla::layers::Layer Layer;
  typedef mozilla::layers::LayerManager LayerManager;
  typedef mozilla::layers::ImageContainer ImageContainer;
  typedef mozilla::ContainerLayerParameters ContainerLayerParameters;


  friend nsIFrame* NS_NewObjectFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);


  virtual void Init(nsIContent*       aContent,
                    nsContainerFrame* aParent,
                    nsIFrame*         aPrevInFlow) MOZ_OVERRIDE;
  virtual nscoord GetMinISize(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
  virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) MOZ_OVERRIDE;
  virtual void Reflow(nsPresContext* aPresContext,
                      nsHTMLReflowMetrics& aDesiredSize,
                      const nsHTMLReflowState& aReflowState,
                      nsReflowStatus& aStatus) MOZ_OVERRIDE;
  virtual void DidReflow(nsPresContext* aPresContext,
                         const nsHTMLReflowState* aReflowState,
                         nsDidReflowStatus aStatus) MOZ_OVERRIDE;
  virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                const nsRect&           aDirtyRect,
                                const nsDisplayListSet& aLists) MOZ_OVERRIDE;

  virtual nsresult  HandleEvent(nsPresContext* aPresContext,
                                mozilla::WidgetGUIEvent* aEvent,
                                nsEventStatus* aEventStatus) MOZ_OVERRIDE;

  virtual nsIAtom* GetType() const MOZ_OVERRIDE;

  virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE
    return nsObjectFrameSuper::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced));

  virtual bool NeedsView() MOZ_OVERRIDE { return true; }

  virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE;

  virtual void DestroyFrom(nsIFrame* aDestructRoot) MOZ_OVERRIDE;

  virtual void DidSetStyleContext(nsStyleContext* aOldStyleContext) MOZ_OVERRIDE;

  NS_METHOD GetPluginInstance(nsNPAPIPluginInstance** aPluginInstance) MOZ_OVERRIDE;

  virtual void SetIsDocumentActive(bool aIsActive) MOZ_OVERRIDE;

  virtual nsresult GetCursor(const nsPoint& aPoint, 
                             nsIFrame::Cursor& aCursor) MOZ_OVERRIDE;

  // APIs used by nsRootPresContext to set up the widget position/size/clip
  // region.
   * Set the next widget configuration for the plugin to the desired
   * position of the plugin's widget, on the assumption that it is not visible
   * (clipped out or covered by opaque content).
   * This will only be called for plugins which have been registered
   * with the root pres context for geometry updates.
   * If there is no widget associated with the plugin, this will have no effect.
  void SetEmptyWidgetConfiguration()
    mNextConfigurationBounds = nsIntRect(0,0,0,0);
   * Append the desired widget configuration to aConfigurations.
  void GetWidgetConfiguration(nsTArray<nsIWidget::Configuration>* aConfigurations)
    if (mWidget) {
      if (!mWidget->GetParent()) {
        // Plugin widgets should not be toplevel except when they're out of the
        // document, in which case the plugin should not be registered for
        // geometry updates and this should not be called. But apparently we
        // have bugs where mWidget sometimes is toplevel here. Bail out.
        NS_ERROR("Plugin widgets registered for geometry updates should not be toplevel");
      nsIWidget::Configuration* configuration = aConfigurations->AppendElement();
      configuration->mChild = mWidget;
      configuration->mBounds = mNextConfigurationBounds;
      configuration->mClipRegion = mNextConfigurationClipRegion;
   * Called after all widget position/size/clip regions have been changed
   * (even if there isn't a widget for this plugin).
  void DidSetWidgetGeometry();

  // accessibility support
  virtual mozilla::a11y::AccType AccessibleType() MOZ_OVERRIDE;
#ifdef XP_WIN
  NS_IMETHOD GetPluginPort(HWND *aPort);

  //local methods
  nsresult PrepForDrawing(nsIWidget *aWidget);

  // for a given aRoot, this walks the frame tree looking for the next outFrame
  static nsIObjectFrame* GetNextObjectFrame(nsPresContext* aPresContext,
                                            nsIFrame* aRoot);

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

   * Builds either an ImageLayer or a ReadbackLayer, depending on the type
   * of aItem (TYPE_PLUGIN or TYPE_PLUGIN_READBACK respectively).
  already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
                                     LayerManager* aManager,
                                     nsDisplayItem* aItem,
                                     const ContainerLayerParameters& aContainerParameters);

  LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
                           LayerManager* aManager);

   * Get the rectangle (relative to this frame) which it will paint. Normally
   * the frame's content-box but may be smaller if the plugin is rendering
   * asynchronously and has a different-sized image temporarily.
  nsRect GetPaintedRect(nsDisplayPlugin* aItem);

   * If aSupports has a nsObjectFrame, then prepare it for a DocShell swap.
   * @see nsSubDocumentFrame::BeginSwapDocShells.
   * There will be a call to EndSwapDocShells after we were moved to the
   * new view tree.
  static void BeginSwapDocShells(nsISupports* aSupports, void*);
   * If aSupports has a nsObjectFrame, then set it up after a DocShell swap.
   * @see nsSubDocumentFrame::EndSwapDocShells.
  static void EndSwapDocShells(nsISupports* aSupports, void*);

  nsIWidget* GetWidget() MOZ_OVERRIDE { return mInnerView ? mWidget : nullptr; }

   * Adjust the plugin's idea of its size, using aSize as its new size.
   * (aSize must be in twips)
  void FixupWindow(const nsSize& aSize);

   * Sets up the plugin window and calls SetWindow on the plugin.
  nsresult CallSetWindow(bool aCheckIsHidden = true);

  void SetInstanceOwner(nsPluginInstanceOwner* aOwner);

  explicit nsObjectFrame(nsStyleContext* aContext);
  virtual ~nsObjectFrame();

  // NOTE:  This frame class does not inherit from |nsLeafFrame|, so
  // this is not a virtual method implementation.
  void GetDesiredSize(nsPresContext* aPresContext,
                      const nsHTMLReflowState& aReflowState,
                      nsHTMLReflowMetrics& aDesiredSize);

  bool IsFocusable(int32_t *aTabIndex = nullptr, 
                   bool aWithMouse = false) MOZ_OVERRIDE;

  // check attributes and optionally CSS to see if we should display anything
  bool IsHidden(bool aCheckVisibilityStyle = true) const;

  bool IsOpaque() const;
  bool IsTransparentMode() const;
  bool IsPaintedByGecko() const;

  nsIntPoint GetWindowOriginInPixels(bool aWindowless);

  static void PaintPrintPlugin(nsIFrame* aFrame,
                               nsRenderingContext* aRenderingContext,
                               const nsRect& aDirtyRect, nsPoint aPt);
  void PrintPlugin(nsRenderingContext& aRenderingContext,
                   const nsRect& aDirtyRect);
  void PaintPlugin(nsDisplayListBuilder* aBuilder,
                   nsRenderingContext& aRenderingContext,
                   const nsRect& aDirtyRect, const nsRect& aPluginRect);

  void NotifyPluginReflowObservers();

  friend class nsPluginInstanceOwner;
  friend class nsDisplayPlugin;
  friend class PluginBackgroundSink;

  // Registers the plugin for a geometry update, and requests a geometry
  // update. This caches the root pres context in
  // mRootPresContextRegisteredWith, so that we can be sure we unregister
  // from the right root prest context in UnregisterPluginForGeometryUpdates.
  void RegisterPluginForGeometryUpdates();

  // Unregisters the plugin for geometry updated with the root pres context
  // stored in mRootPresContextRegisteredWith.
  void UnregisterPluginForGeometryUpdates();

  class PluginEventNotifier : public nsRunnable {
    explicit PluginEventNotifier(const nsString &aEventType) : 
      mEventType(aEventType) {}
    nsString mEventType;

  nsPluginInstanceOwner*          mInstanceOwner; // WEAK
  nsView*                        mInnerView;
  nsCOMPtr<nsIWidget>             mWidget;
  nsIntRect                       mWindowlessRect;
   * This is owned by the ReadbackLayer for this nsObjectFrame. It is
   * automatically cleared if the PluginBackgroundSink is destroyed.
  PluginBackgroundSink*           mBackgroundSink;

   * Bounds that we should set the plugin's widget to in the next composite,
   * for plugins with widgets. For plugins without widgets, bounds in device
   * pixels relative to the nearest frame that's a display list reference frame.
  nsIntRect                       mNextConfigurationBounds;
   * Clip region that we should set the plugin's widget to
   * in the next composite. Only meaningful for plugins with widgets.
  nsTArray<nsIntRect>             mNextConfigurationClipRegion;

  bool mReflowCallbackPosted;

  // We keep this reference to ensure we can always unregister the
  // plugins we register on the root PresContext.
  // This is only non-null while we have a plugin registered for geometry
  // updates.
  nsRefPtr<nsRootPresContext> mRootPresContextRegisteredWith;

class nsDisplayPlugin : public nsDisplayItem {
  nsDisplayPlugin(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
    : nsDisplayItem(aBuilder, aFrame)
  virtual ~nsDisplayPlugin() {

  virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) MOZ_OVERRIDE;
  virtual nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
                                   bool* aSnap) MOZ_OVERRIDE;
  virtual void Paint(nsDisplayListBuilder* aBuilder,
                     nsRenderingContext* aCtx) MOZ_OVERRIDE;
  virtual bool ComputeVisibility(nsDisplayListBuilder* aBuilder,
                                 nsRegion* aVisibleRegion) MOZ_OVERRIDE;


  virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
                                             LayerManager* aManager,
                                             const ContainerLayerParameters& aContainerParameters) MOZ_OVERRIDE
    return static_cast<nsObjectFrame*>(mFrame)->BuildLayer(aBuilder,

  virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
                                   LayerManager* aManager,
                                   const ContainerLayerParameters& aParameters) MOZ_OVERRIDE
    return static_cast<nsObjectFrame*>(mFrame)->GetLayerState(aBuilder,

#endif /* nsObjectFrame_h___ */