The Tor Browser: layout/ipc/RenderFrameParent.cpp@7e26c7da4463 (annotated)

layout/ipc/RenderFrameParent.cpp@7e26c7da4463 (annotated)

layout/ipc/RenderFrameParent.cpp

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
  * vim: sw=2 ts=8 et :
  */
 /* 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/. */
 #include "base/basictypes.h"
 #include "BasicLayers.h"
 #include "gfx3DMatrix.h"
 #ifdef MOZ_ENABLE_D3D9_LAYER
 # include "LayerManagerD3D9.h"
 #endif //MOZ_ENABLE_D3D9_LAYER
 #include "mozilla/BrowserElementParent.h"
 #include "mozilla/dom/TabParent.h"
 #include "mozilla/layers/APZCTreeManager.h"
 #include "mozilla/layers/CompositorParent.h"
 #include "mozilla/layers/LayerTransactionParent.h"
 #include "nsContentUtils.h"
 #include "nsFrameLoader.h"
 #include "nsIObserver.h"
 #include "nsSubDocumentFrame.h"
 #include "nsView.h"
 #include "nsViewportFrame.h"
 #include "RenderFrameParent.h"
 #include "mozilla/layers/LayerManagerComposite.h"
 #include "mozilla/layers/CompositorChild.h"
 #include "ClientLayerManager.h"
 typedef nsContentView::ViewConfig ViewConfig;
 using namespace mozilla::dom;
 using namespace mozilla::layers;
 namespace mozilla {
 namespace layout {
 typedef FrameMetrics::ViewID ViewID;
 typedef RenderFrameParent::ViewMap ViewMap;
 // Represents (affine) transforms that are calculated from a content view.
 struct ViewTransform {
   ViewTransform(nsIntPoint aTranslation = nsIntPoint(0, 0), float aXScale = 1, float aYScale = 1)
     : mTranslation(aTranslation)
     , mXScale(aXScale)
     , mYScale(aYScale)
   {}
   operator gfx3DMatrix() const
   {
     return
       gfx3DMatrix::Translation(mTranslation.x, mTranslation.y, 0) *
       gfx3DMatrix::ScalingMatrix(mXScale, mYScale, 1);
   }
   nsIntPoint mTranslation;
   float mXScale;
   float mYScale;
 };
 // Matrix helpers
 // For our simple purposes, these helpers apply to 2D affine transformations
 // that can be represented by a scale and a translation. This makes the math
 // much easier because we only expect the diagonals and the translation
 // coordinates of the matrix to be non-zero.
 static double GetXScale(const gfx3DMatrix& aTransform)
 {
   return aTransform._11;
 }
 static double GetYScale(const gfx3DMatrix& aTransform)
 {
   return aTransform._22;
 }
 static void Scale(gfx3DMatrix& aTransform, double aXScale, double aYScale)
 {
   aTransform._11 *= aXScale;
   aTransform._22 *= aYScale;
 }
 static void ReverseTranslate(gfx3DMatrix& aTransform, const gfxPoint& aOffset)
 {
   aTransform._41 -= aOffset.x;
   aTransform._42 -= aOffset.y;
 }
 static void ApplyTransform(nsRect& aRect,
                            gfx3DMatrix& aTransform,
                            nscoord auPerDevPixel)
 {
   aRect.x = aRect.x * aTransform._11 + aTransform._41 * auPerDevPixel;
   aRect.y = aRect.y * aTransform._22 + aTransform._42 * auPerDevPixel;
   aRect.width = aRect.width * aTransform._11;
   aRect.height = aRect.height * aTransform._22;
 }
 static void
 AssertInTopLevelChromeDoc(ContainerLayer* aContainer,
                           nsIFrame* aContainedFrame)
 {
   NS_ASSERTION(
     (aContainer->Manager()->GetBackendType() != mozilla::layers::LayersBackend::LAYERS_BASIC) ||
     (aContainedFrame->GetNearestWidget() ==
      static_cast<BasicLayerManager*>(aContainer->Manager())->GetRetainerWidget()),
     "Expected frame to be in top-level chrome document");
 }
 // Return view for given ID in aMap, nullptr if not found.
 static nsContentView*
 FindViewForId(const ViewMap& aMap, ViewID aId)
 {
   ViewMap::const_iterator iter = aMap.find(aId);
   return iter != aMap.end() ? iter->second : nullptr;
 }
 // Return the root content view in aMap, nullptr if not found.
 static nsContentView*
 FindRootView(const ViewMap& aMap)
 {
   for (ViewMap::const_iterator iter = aMap.begin(), end = aMap.end();
        iter != end;
        ++iter) {
     if (iter->second->IsRoot())
       return iter->second;
   }
   return nullptr;
 }
 static const FrameMetrics*
 GetFrameMetrics(Layer* aLayer)
 {
   ContainerLayer* container = aLayer->AsContainerLayer();
   return container ? &container->GetFrameMetrics() : nullptr;
 }
 /**
  * Gets the layer-pixel offset of aContainerFrame's content rect top-left
  * from the nearest display item reference frame (which we assume will be inducing
  * a ContainerLayer).
  */
 static nsIntPoint
 GetContentRectLayerOffset(nsIFrame* aContainerFrame, nsDisplayListBuilder* aBuilder)
 {
   nscoord auPerDevPixel = aContainerFrame->PresContext()->AppUnitsPerDevPixel();
   // Offset to the content rect in case we have borders or padding
   // Note that aContainerFrame could be a reference frame itself, so
   // we need to be careful here to ensure that we call ToReferenceFrame
   // on aContainerFrame and not its parent.
   nsPoint frameOffset = aBuilder->ToReferenceFrame(aContainerFrame) +
     (aContainerFrame->GetContentRect().TopLeft() - aContainerFrame->GetPosition());
   return frameOffset.ToNearestPixels(auPerDevPixel);
 }
 // Compute the transform of the shadow tree contained by
 // |aContainerFrame| to widget space.  We transform because the
 // subprocess layer manager renders to a different top-left than where
 // the shadow tree is drawn here and because a scale can be set on the
 // shadow tree.
 static ViewTransform
 ComputeShadowTreeTransform(nsIFrame* aContainerFrame,
                            nsFrameLoader* aRootFrameLoader,
                            const FrameMetrics* aMetrics,
                            const ViewConfig& aConfig,
                            float aTempScaleX = 1.0,
                            float aTempScaleY = 1.0)
 {
   // |aMetrics->mViewportScrollOffset| The frame's scroll offset when it was
   //                                   painted, in content document pixels.
   // |aConfig.mScrollOffset|           What our user expects, or wants, the
   //                                   frame scroll offset to be in chrome
   //                                   document app units.
   //
   // So we set a compensating translation that moves the content document
   // pixels to where the user wants them to be.
   //
   nscoord auPerDevPixel = aContainerFrame->PresContext()->AppUnitsPerDevPixel();
   nsIntPoint scrollOffset =
     aConfig.mScrollOffset.ToNearestPixels(auPerDevPixel);
   LayerIntPoint metricsScrollOffset = RoundedToInt(aMetrics->GetScrollOffsetInLayerPixels());
   if (aRootFrameLoader->AsyncScrollEnabled() && !aMetrics->mDisplayPort.IsEmpty()) {
     // Only use asynchronous scrolling if it is enabled and there is a
     // displayport defined. It is useful to have a scroll layer that is
     // synchronously scrolled for identifying a scroll area before it is
     // being actively scrolled.
     nsIntPoint scrollCompensation(
       (scrollOffset.x / aTempScaleX - metricsScrollOffset.x),
       (scrollOffset.y / aTempScaleY - metricsScrollOffset.y));
     return ViewTransform(-scrollCompensation, aConfig.mXScale, aConfig.mYScale);
   } else {
     return ViewTransform(nsIntPoint(0, 0), 1, 1);
   }
 }
 // Use shadow layer tree to build display list for the browser's frame.
 static void
 BuildListForLayer(Layer* aLayer,
                   nsFrameLoader* aRootFrameLoader,
                   const gfx3DMatrix& aTransform,
                   nsDisplayListBuilder* aBuilder,
                   nsDisplayList& aShadowTree,
                   nsIFrame* aSubdocFrame)
 {
   const FrameMetrics* metrics = GetFrameMetrics(aLayer);
   gfx3DMatrix transform;
   if (metrics && metrics->IsScrollable()) {
     const ViewID scrollId = metrics->GetScrollId();
     // We need to figure out the bounds of the scrollable region using the
     // shadow layer tree from the remote process. The metrics viewport is
     // defined based on all the transformations of its parent layers and
     // the scale of the current layer.
     // Calculate transform for this layer.
     nsContentView* view =
       aRootFrameLoader->GetCurrentRemoteFrame()->GetContentView(scrollId);
     // XXX why don't we include aLayer->GetTransform() in the inverse-scale here?
     // This seems wrong, but it doesn't seem to cause bugs!
     gfx3DMatrix applyTransform = ComputeShadowTreeTransform(
       aSubdocFrame, aRootFrameLoader, metrics, view->GetViewConfig(),
 / GetXScale(aTransform), 1 / GetYScale(aTransform));
     gfx3DMatrix layerTransform;
     To3DMatrix(aLayer->GetTransform(), layerTransform);
     transform = applyTransform * layerTransform * aTransform;
     // As mentioned above, bounds calculation also depends on the scale
     // of this layer.
     gfx3DMatrix tmpTransform = aTransform;
     Scale(tmpTransform, GetXScale(applyTransform), GetYScale(applyTransform));
     // Calculate rect for this layer based on aTransform.
     nsRect bounds;
     {
       bounds = CSSRect::ToAppUnits(metrics->mViewport);
       nscoord auPerDevPixel = aSubdocFrame->PresContext()->AppUnitsPerDevPixel();
       ApplyTransform(bounds, tmpTransform, auPerDevPixel);
     }
     aShadowTree.AppendToTop(
       new (aBuilder) nsDisplayRemoteShadow(aBuilder, aSubdocFrame, bounds, scrollId));
   } else {
     gfx3DMatrix layerTransform;
     To3DMatrix(aLayer->GetTransform(), layerTransform);
     transform = layerTransform * aTransform;
   }
   for (Layer* child = aLayer->GetFirstChild(); child;
        child = child->GetNextSibling()) {
     BuildListForLayer(child, aRootFrameLoader, transform,
                       aBuilder, aShadowTree, aSubdocFrame);
   }
 }
 // Go down shadow layer tree and apply transformations for scrollable layers.
 static void
 TransformShadowTree(nsDisplayListBuilder* aBuilder, nsFrameLoader* aFrameLoader,
                     nsIFrame* aFrame, Layer* aLayer,
                     const ViewTransform& aTransform,
                     float aTempScaleDiffX = 1.0,
                     float aTempScaleDiffY = 1.0)
 {
   LayerComposite* shadow = aLayer->AsLayerComposite();
   shadow->SetShadowClipRect(aLayer->GetClipRect());
   shadow->SetShadowVisibleRegion(aLayer->GetVisibleRegion());
   shadow->SetShadowOpacity(aLayer->GetOpacity());
   const FrameMetrics* metrics = GetFrameMetrics(aLayer);
   gfx3DMatrix shadowTransform;
   To3DMatrix(aLayer->GetTransform(), shadowTransform);
   ViewTransform layerTransform = aTransform;
   if (metrics && metrics->IsScrollable()) {
     const ViewID scrollId = metrics->GetScrollId();
     const nsContentView* view =
       aFrameLoader->GetCurrentRemoteFrame()->GetContentView(scrollId);
     NS_ABORT_IF_FALSE(view, "Array of views should be consistent with layer tree");
     gfx3DMatrix currentTransform;
     To3DMatrix(aLayer->GetTransform(), currentTransform);
     const ViewConfig& config = view->GetViewConfig();
     // With temporary scale we should compensate translation
     // using temporary scale value
     aTempScaleDiffX *= GetXScale(shadowTransform) * config.mXScale;
     aTempScaleDiffY *= GetYScale(shadowTransform) * config.mYScale;
     ViewTransform viewTransform = ComputeShadowTreeTransform(
       aFrame, aFrameLoader, metrics, view->GetViewConfig(),
       aTempScaleDiffX, aTempScaleDiffY
     );
     // Apply the layer's own transform *before* the view transform
     shadowTransform = gfx3DMatrix(viewTransform) * currentTransform;
     layerTransform = viewTransform;
     if (metrics->IsRootScrollable()) {
       // Apply the translation *before* we do the rest of the transforms.
       nsIntPoint offset = GetContentRectLayerOffset(aFrame, aBuilder);
       shadowTransform = shadowTransform *
           gfx3DMatrix::Translation(float(offset.x), float(offset.y), 0.0);
     }
   }
   if (aLayer->GetIsFixedPosition() &&
       !aLayer->GetParent()->GetIsFixedPosition()) {
     // Alter the shadow transform of fixed position layers in the situation
     // that the view transform's scroll position doesn't match the actual
     // scroll position, due to asynchronous layer scrolling.
     float offsetX = layerTransform.mTranslation.x;
     float offsetY = layerTransform.mTranslation.y;
     ReverseTranslate(shadowTransform, gfxPoint(offsetX, offsetY));
     const nsIntRect* clipRect = shadow->GetShadowClipRect();
     if (clipRect) {
       nsIntRect transformedClipRect(*clipRect);
       transformedClipRect.MoveBy(-offsetX, -offsetY);
       shadow->SetShadowClipRect(&transformedClipRect);
     }
   }
   // The transform already takes the resolution scale into account.  Since we
   // will apply the resolution scale again when computing the effective
   // transform, we must apply the inverse resolution scale here.
   if (ContainerLayer* c = aLayer->AsContainerLayer()) {
     shadowTransform.Scale(1.0f/c->GetPreXScale(),
 .0f/c->GetPreYScale(),
 );
   }
   shadowTransform.ScalePost(1.0f/aLayer->GetPostXScale(),
 .0f/aLayer->GetPostYScale(),
 );
   gfx::Matrix4x4 realShadowTransform;
   ToMatrix4x4(shadowTransform, realShadowTransform);
   shadow->SetShadowTransform(realShadowTransform);
   for (Layer* child = aLayer->GetFirstChild();
        child; child = child->GetNextSibling()) {
     TransformShadowTree(aBuilder, aFrameLoader, aFrame, child, layerTransform,
                         aTempScaleDiffX, aTempScaleDiffY);
   }
 }
 static void
 ClearContainer(ContainerLayer* aContainer)
 {
   while (Layer* layer = aContainer->GetFirstChild()) {
     aContainer->RemoveChild(layer);
   }
 }
 // Return true iff |aManager| is a "temporary layer manager".  They're
 // used for small software rendering tasks, like drawWindow.  That's
 // currently implemented by a BasicLayerManager without a backing
 // widget, and hence in non-retained mode.
 inline static bool
 IsTempLayerManager(LayerManager* aManager)
 {
   return (mozilla::layers::LayersBackend::LAYERS_BASIC == aManager->GetBackendType() &&
           !static_cast<BasicLayerManager*>(aManager)->IsRetained());
 }
 // Recursively create a new array of scrollables, preserving any scrollables
 // that are still in the layer tree.
 //
 // aXScale and aYScale are used to calculate any values that need to be in
 // chrome-document CSS pixels and aren't part of the rendering loop, such as
 // the initial scroll offset for a new view.
 static void
 BuildViewMap(ViewMap& oldContentViews, ViewMap& newContentViews,
              nsFrameLoader* aFrameLoader, Layer* aLayer,
              float aXScale = 1, float aYScale = 1,
              float aAccConfigXScale = 1, float aAccConfigYScale = 1)
 {
   ContainerLayer* container = aLayer->AsContainerLayer();
   if (!container)
     return;
   const FrameMetrics metrics = container->GetFrameMetrics();
   const ViewID scrollId = metrics.GetScrollId();
   gfx3DMatrix transform;
   To3DMatrix(aLayer->GetTransform(), transform);
   aXScale *= GetXScale(transform);
   aYScale *= GetYScale(transform);
   if (metrics.IsScrollable()) {
     nscoord auPerDevPixel = aFrameLoader->GetPrimaryFrameOfOwningContent()
                                         ->PresContext()->AppUnitsPerDevPixel();
     nscoord auPerCSSPixel = auPerDevPixel * metrics.mDevPixelsPerCSSPixel.scale;
     nsContentView* view = FindViewForId(oldContentViews, scrollId);
     if (view) {
       // View already exists. Be sure to propagate scales for any values
       // that need to be calculated something in chrome-doc CSS pixels.
       ViewConfig config = view->GetViewConfig();
       aXScale *= config.mXScale;
       aYScale *= config.mYScale;
       view->mFrameLoader = aFrameLoader;
       // If scale has changed, then we should update
       // current scroll offset to new scaled value
       if (aAccConfigXScale != view->mParentScaleX ||
           aAccConfigYScale != view->mParentScaleY) {
         float xscroll = 0, yscroll = 0;
         view->GetScrollX(&xscroll);
         view->GetScrollY(&yscroll);
         xscroll = xscroll * (aAccConfigXScale / view->mParentScaleX);
         yscroll = yscroll * (aAccConfigYScale / view->mParentScaleY);
         view->ScrollTo(xscroll, yscroll);
         view->mParentScaleX = aAccConfigXScale;
         view->mParentScaleY = aAccConfigYScale;
       }
       // Collect only config scale values for scroll compensation
       aAccConfigXScale *= config.mXScale;
       aAccConfigYScale *= config.mYScale;
     } else {
       // View doesn't exist, so generate one. We start the view scroll offset at
       // the same position as the framemetric's scroll offset from the layer.
       // The default scale is 1, so no need to propagate scale down.
       ViewConfig config;
       config.mScrollOffset = nsPoint(
         NSIntPixelsToAppUnits(metrics.GetScrollOffset().x, auPerCSSPixel) * aXScale,
         NSIntPixelsToAppUnits(metrics.GetScrollOffset().y, auPerCSSPixel) * aYScale);
       view = new nsContentView(aFrameLoader, scrollId, metrics.mIsRoot, config);
       view->mParentScaleX = aAccConfigXScale;
       view->mParentScaleY = aAccConfigYScale;
     }
     // I don't know what units mViewportSize is in, hence use ToUnknownRect
     // here to mark the current frontier in type info propagation
     gfx::Rect viewport = metrics.mViewport.ToUnknownRect();
     view->mViewportSize = nsSize(
       NSIntPixelsToAppUnits(viewport.width, auPerDevPixel) * aXScale,
       NSIntPixelsToAppUnits(viewport.height, auPerDevPixel) * aYScale);
     view->mContentSize = nsSize(
       NSFloatPixelsToAppUnits(metrics.mScrollableRect.width, auPerCSSPixel) * aXScale,
       NSFloatPixelsToAppUnits(metrics.mScrollableRect.height, auPerCSSPixel) * aYScale);
     newContentViews[scrollId] = view;
   }
   for (Layer* child = aLayer->GetFirstChild();
        child; child = child->GetNextSibling()) {
     BuildViewMap(oldContentViews, newContentViews, aFrameLoader, child,
                  aXScale, aYScale, aAccConfigXScale, aAccConfigYScale);
   }
 }
 static void
 BuildBackgroundPatternFor(ContainerLayer* aContainer,
                           Layer* aShadowRoot,
                           const ViewConfig& aConfig,
                           const gfxRGBA& aColor,
                           LayerManager* aManager,
                           nsIFrame* aFrame)
 {
   LayerComposite* shadowRoot = aShadowRoot->AsLayerComposite();
   gfx::Matrix t;
   if (!shadowRoot->GetShadowTransform().Is2D(&t)) {
     return;
   }
   // Get the rect bounding the shadow content, transformed into the
   // same space as |aFrame|
   nsIntRect contentBounds = shadowRoot->GetShadowVisibleRegion().GetBounds();
   gfxRect contentVis(contentBounds.x, contentBounds.y,
                      contentBounds.width, contentBounds.height);
   gfxRect localContentVis(gfx::ThebesMatrix(t).Transform(contentVis));
   // Round *in* here because this area is punched out of the background
   localContentVis.RoundIn();
   nsIntRect localIntContentVis(localContentVis.X(), localContentVis.Y(),
                                localContentVis.Width(), localContentVis.Height());
   // Get the frame's rect
   nscoord auPerDevPixel = aFrame->PresContext()->AppUnitsPerDevPixel();
   nsIntRect frameRect = aFrame->GetRect().ToOutsidePixels(auPerDevPixel);
   // If the shadow tree covers the frame rect, don't bother building
   // the background, it wouldn't be visible
   if (localIntContentVis.Contains(frameRect)) {
     return;
   }
   nsRefPtr<ColorLayer> layer = aManager->CreateColorLayer();
   layer->SetColor(aColor);
   // The visible area of the background is the frame's area minus the
   // content area
   nsIntRegion bgRgn(frameRect);
   bgRgn.Sub(bgRgn, localIntContentVis);
   bgRgn.MoveBy(-frameRect.TopLeft());
   layer->SetVisibleRegion(bgRgn);
   aContainer->InsertAfter(layer, nullptr);
 }
 already_AddRefed<LayerManager>
 GetFrom(nsFrameLoader* aFrameLoader)
 {
   nsIDocument* doc = aFrameLoader->GetOwnerDoc();
   return nsContentUtils::LayerManagerForDocument(doc);
 }
 class RemoteContentController : public GeckoContentController {
 public:
   RemoteContentController(RenderFrameParent* aRenderFrame)
     : mUILoop(MessageLoop::current())
     , mRenderFrame(aRenderFrame)
     , mHaveZoomConstraints(false)
   { }
   virtual void RequestContentRepaint(const FrameMetrics& aFrameMetrics) MOZ_OVERRIDE
   {
     // We always need to post requests into the "UI thread" otherwise the
     // requests may get processed out of order.
     mUILoop->PostTask(
       FROM_HERE,
       NewRunnableMethod(this, &RemoteContentController::DoRequestContentRepaint,
                         aFrameMetrics));
   }
   virtual void AcknowledgeScrollUpdate(const FrameMetrics::ViewID& aScrollId,
                                        const uint32_t& aScrollGeneration) MOZ_OVERRIDE
   {
     if (MessageLoop::current() != mUILoop) {
       // We have to send this message from the "UI thread" (main
       // thread).
       mUILoop->PostTask(
         FROM_HERE,
         NewRunnableMethod(this, &RemoteContentController::AcknowledgeScrollUpdate,
                           aScrollId, aScrollGeneration));
       return;
     }
     if (mRenderFrame) {
       TabParent* browser = static_cast<TabParent*>(mRenderFrame->Manager());
       browser->AcknowledgeScrollUpdate(aScrollId, aScrollGeneration);
     }
   }
   virtual void HandleDoubleTap(const CSSPoint& aPoint,
                                int32_t aModifiers,
                                const ScrollableLayerGuid& aGuid) MOZ_OVERRIDE
   {
     if (MessageLoop::current() != mUILoop) {
       // We have to send this message from the "UI thread" (main
       // thread).
       mUILoop->PostTask(
         FROM_HERE,
         NewRunnableMethod(this, &RemoteContentController::HandleDoubleTap,
                           aPoint, aModifiers, aGuid));
       return;
     }
     if (mRenderFrame) {
       TabParent* browser = static_cast<TabParent*>(mRenderFrame->Manager());
       browser->HandleDoubleTap(aPoint, aModifiers, aGuid);
     }
   }
   virtual void HandleSingleTap(const CSSPoint& aPoint,
                                int32_t aModifiers,
                                const ScrollableLayerGuid& aGuid) MOZ_OVERRIDE
   {
     if (MessageLoop::current() != mUILoop) {
       // We have to send this message from the "UI thread" (main
       // thread).
       mUILoop->PostTask(
         FROM_HERE,
         NewRunnableMethod(this, &RemoteContentController::HandleSingleTap,
                           aPoint, aModifiers, aGuid));
       return;
     }
     if (mRenderFrame) {
       TabParent* browser = static_cast<TabParent*>(mRenderFrame->Manager());
       browser->HandleSingleTap(aPoint, aModifiers, aGuid);
     }
   }
   virtual void HandleLongTap(const CSSPoint& aPoint,
                              int32_t aModifiers,
                              const ScrollableLayerGuid& aGuid) MOZ_OVERRIDE
   {
     if (MessageLoop::current() != mUILoop) {
       // We have to send this message from the "UI thread" (main
       // thread).
       mUILoop->PostTask(
         FROM_HERE,
         NewRunnableMethod(this, &RemoteContentController::HandleLongTap,
                           aPoint, aModifiers, aGuid));
       return;
     }
     if (mRenderFrame) {
       TabParent* browser = static_cast<TabParent*>(mRenderFrame->Manager());
       browser->HandleLongTap(aPoint, aModifiers, aGuid);
     }
   }
   virtual void HandleLongTapUp(const CSSPoint& aPoint,
                                int32_t aModifiers,
                                const ScrollableLayerGuid& aGuid) MOZ_OVERRIDE
   {
     if (MessageLoop::current() != mUILoop) {
       // We have to send this message from the "UI thread" (main
       // thread).
       mUILoop->PostTask(
         FROM_HERE,
         NewRunnableMethod(this, &RemoteContentController::HandleLongTapUp,
                           aPoint, aModifiers, aGuid));
       return;
     }
     if (mRenderFrame) {
       TabParent* browser = static_cast<TabParent*>(mRenderFrame->Manager());
       browser->HandleLongTapUp(aPoint, aModifiers, aGuid);
     }
   }
   void ClearRenderFrame() { mRenderFrame = nullptr; }
   virtual void SendAsyncScrollDOMEvent(bool aIsRoot,
                                        const CSSRect& aContentRect,
                                        const CSSSize& aContentSize) MOZ_OVERRIDE
   {
     if (MessageLoop::current() != mUILoop) {
       mUILoop->PostTask(
         FROM_HERE,
         NewRunnableMethod(this,
                           &RemoteContentController::SendAsyncScrollDOMEvent,
                           aIsRoot, aContentRect, aContentSize));
       return;
     }
     if (mRenderFrame && aIsRoot) {
       TabParent* browser = static_cast<TabParent*>(mRenderFrame->Manager());
       BrowserElementParent::DispatchAsyncScrollEvent(browser, aContentRect,
                                                      aContentSize);
     }
   }
   virtual void PostDelayedTask(Task* aTask, int aDelayMs) MOZ_OVERRIDE
   {
     MessageLoop::current()->PostDelayedTask(FROM_HERE, aTask, aDelayMs);
   }
   virtual bool GetRootZoomConstraints(ZoomConstraints* aOutConstraints)
   {
     if (mHaveZoomConstraints && aOutConstraints) {
       *aOutConstraints = mZoomConstraints;
     }
     return mHaveZoomConstraints;
   }
   virtual bool GetTouchSensitiveRegion(CSSRect* aOutRegion)
   {
     if (mTouchSensitiveRegion.IsEmpty())
       return false;
     *aOutRegion = CSSRect::FromAppUnits(mTouchSensitiveRegion.GetBounds());
     return true;
   }
   virtual void NotifyAPZStateChange(const ScrollableLayerGuid& aGuid,
                                     APZStateChange aChange,
                                     int aArg)
   {
     if (MessageLoop::current() != mUILoop) {
       mUILoop->PostTask(
         FROM_HERE,
         NewRunnableMethod(this, &RemoteContentController::NotifyAPZStateChange,
                           aGuid, aChange, aArg));
       return;
     }
     if (mRenderFrame) {
       TabParent* browser = static_cast<TabParent*>(mRenderFrame->Manager());
       browser->NotifyAPZStateChange(aGuid.mScrollId, aChange, aArg);
     }
   }
   // Methods used by RenderFrameParent to set fields stored here.
   void SaveZoomConstraints(const ZoomConstraints& aConstraints)
   {
     mHaveZoomConstraints = true;
     mZoomConstraints = aConstraints;
   }
   void SetTouchSensitiveRegion(const nsRegion& aRegion)
   {
     mTouchSensitiveRegion = aRegion;
   }
 private:
   void DoRequestContentRepaint(const FrameMetrics& aFrameMetrics)
   {
     if (mRenderFrame) {
       TabParent* browser = static_cast<TabParent*>(mRenderFrame->Manager());
       browser->UpdateFrame(aFrameMetrics);
     }
   }
   MessageLoop* mUILoop;
   RenderFrameParent* mRenderFrame;
   bool mHaveZoomConstraints;
   ZoomConstraints mZoomConstraints;
   nsRegion mTouchSensitiveRegion;
 };
 RenderFrameParent::RenderFrameParent()
   : mLayersId(0)
   , mFrameLoaderDestroyed(false)
   , mBackgroundColor(gfxRGBA(1, 1, 1))
 {
 }
 void
 RenderFrameParent::Init(nsFrameLoader* aFrameLoader,
                         ScrollingBehavior aScrollingBehavior,
                         TextureFactoryIdentifier* aTextureFactoryIdentifier,
                         uint64_t* aId)
 {
   mFrameLoader = aFrameLoader;
   *aId = 0;
   nsRefPtr<LayerManager> lm = GetFrom(mFrameLoader);
   // Perhaps the document containing this frame currently has no presentation?
   if (lm && lm->GetBackendType() == LayersBackend::LAYERS_CLIENT) {
     *aTextureFactoryIdentifier =
       static_cast<ClientLayerManager*>(lm.get())->GetTextureFactoryIdentifier();
   } else {
     *aTextureFactoryIdentifier = TextureFactoryIdentifier();
   }
   if (lm && lm->GetRoot() && lm->GetRoot()->AsContainerLayer()) {
     ViewID rootScrollId = lm->GetRoot()->AsContainerLayer()->GetFrameMetrics().GetScrollId();
     if (rootScrollId != FrameMetrics::NULL_SCROLL_ID) {
       mContentViews[rootScrollId] = new nsContentView(aFrameLoader, rootScrollId, true);
     }
   }
   if (CompositorParent::CompositorLoop()) {
     // Our remote frame will push layers updates to the compositor,
     // and we'll keep an indirect reference to that tree.
     *aId = mLayersId = CompositorParent::AllocateLayerTreeId();
     if (lm && lm->GetBackendType() == LayersBackend::LAYERS_CLIENT) {
       ClientLayerManager *clientManager = static_cast<ClientLayerManager*>(lm.get());
       clientManager->GetRemoteRenderer()->SendNotifyChildCreated(mLayersId);
     }
     if (aScrollingBehavior == ASYNC_PAN_ZOOM) {
       mContentController = new RemoteContentController(this);
       CompositorParent::SetControllerForLayerTree(mLayersId, mContentController);
     }
   }
   // Set a default RenderFrameParent
   mFrameLoader->SetCurrentRemoteFrame(this);
 }
 APZCTreeManager*
 RenderFrameParent::GetApzcTreeManager()
 {
   // We can't get a ref to the APZCTreeManager until after the child is
   // created and the static getter knows which CompositorParent is
   // instantiated with this layers ID. That's why try to fetch it when
   // we first need it and cache the result.
   if (!mApzcTreeManager) {
     mApzcTreeManager = CompositorParent::GetAPZCTreeManager(mLayersId);
   }
   return mApzcTreeManager.get();
 }
 RenderFrameParent::~RenderFrameParent()
 {}
 void
 RenderFrameParent::Destroy()
 {
   size_t numChildren = ManagedPLayerTransactionParent().Length();
   NS_ABORT_IF_FALSE(0 == numChildren || 1 == numChildren,
                     "render frame must only have 0 or 1 layer manager");
   if (numChildren) {
     LayerTransactionParent* layers =
       static_cast<LayerTransactionParent*>(ManagedPLayerTransactionParent()[0]);
     layers->Destroy();
   }
   mFrameLoaderDestroyed = true;
 }
 nsContentView*
 RenderFrameParent::GetContentView(ViewID aId)
 {
   return FindViewForId(mContentViews, aId);
 }
 nsContentView*
 RenderFrameParent::GetRootContentView()
 {
   return FindRootView(mContentViews);
 }
 void
 RenderFrameParent::ContentViewScaleChanged(nsContentView* aView)
 {
   // Since the scale has changed for a view, it and its descendents need their
   // shadow-space attributes updated. It's easiest to rebuild the view map.
   BuildViewMap();
 }
 void
 RenderFrameParent::ShadowLayersUpdated(LayerTransactionParent* aLayerTree,
                                        const TargetConfig& aTargetConfig,
                                        bool aIsFirstPaint,
                                        bool aScheduleComposite)
 {
   // View map must only contain views that are associated with the current
   // shadow layer tree. We must always update the map when shadow layers
   // are updated.
   BuildViewMap();
   TriggerRepaint();
 }
 already_AddRefed<Layer>
 RenderFrameParent::BuildLayer(nsDisplayListBuilder* aBuilder,
                               nsIFrame* aFrame,
                               LayerManager* aManager,
                               const nsIntRect& aVisibleRect,
                               nsDisplayItem* aItem,
                               const ContainerLayerParameters& aContainerParameters)
 {
   NS_ABORT_IF_FALSE(aFrame,
                     "makes no sense to have a shadow tree without a frame");
   NS_ABORT_IF_FALSE(!mContainer ||
                     IsTempLayerManager(aManager) ||
                     mContainer->Manager() == aManager,
                     "retaining manager changed out from under us ... HELP!");
   if (IsTempLayerManager(aManager) ||
       (mContainer && mContainer->Manager() != aManager)) {
     // This can happen if aManager is a "temporary" manager, or if the
     // widget's layer manager changed out from under us.  We need to
     // FIXME handle the former case somehow, probably with an API to
     // draw a manager's subtree.  The latter is bad bad bad, but the
     // the NS_ABORT_IF_FALSE() above will flag it.  Returning nullptr
     // here will just cause the shadow subtree not to be rendered.
     NS_WARNING("Remote iframe not rendered");
     return nullptr;
   }
   uint64_t id = GetLayerTreeId();
   if (0 != id) {
     MOZ_ASSERT(!GetRootLayer());
     nsRefPtr<Layer> layer =
       (aManager->GetLayerBuilder()->GetLeafLayerFor(aBuilder, aItem));
     if (!layer) {
       layer = aManager->CreateRefLayer();
     }
     if (!layer) {
       // Probably a temporary layer manager that doesn't know how to
       // use ref layers.
       return nullptr;
     }
     static_cast<RefLayer*>(layer.get())->SetReferentId(id);
     nsIntPoint offset = GetContentRectLayerOffset(aFrame, aBuilder);
     layer->SetVisibleRegion(aVisibleRect - offset);
     // We can only have an offset if we're a child of an inactive
     // container, but our display item is LAYER_ACTIVE_FORCE which
     // forces all layers above to be active.
     MOZ_ASSERT(aContainerParameters.mOffset == nsIntPoint());
     gfx::Matrix4x4 m;
     m.Translate(offset.x, offset.y, 0.0);
     // Remote content can't be repainted by us, so we multiply down
     // the resolution that our container expects onto our container.
     m.Scale(aContainerParameters.mXScale, aContainerParameters.mYScale, 1.0);
     layer->SetBaseTransform(m);
     return layer.forget();
   }
   if (mContainer) {
     ClearContainer(mContainer);
     mContainer->SetPreScale(1.0f, 1.0f);
     mContainer->SetPostScale(1.0f, 1.0f);
     mContainer->SetInheritedScale(1.0f, 1.0f);
   }
   Layer* shadowRoot = GetRootLayer();
   if (!shadowRoot) {
     mContainer = nullptr;
     return nullptr;
   }
   NS_ABORT_IF_FALSE(!shadowRoot || shadowRoot->Manager() == aManager,
                     "retaining manager changed out from under us ... HELP!");
   // Wrap the shadow layer tree in mContainer.
   if (!mContainer) {
     mContainer = aManager->CreateContainerLayer();
   }
   NS_ABORT_IF_FALSE(!mContainer->GetFirstChild(),
                     "container of shadow tree shouldn't have a 'root' here");
   mContainer->InsertAfter(shadowRoot, nullptr);
   AssertInTopLevelChromeDoc(mContainer, aFrame);
   ViewTransform transform;
   TransformShadowTree(aBuilder, mFrameLoader, aFrame, shadowRoot, transform);
   mContainer->SetClipRect(nullptr);
   if (mFrameLoader->AsyncScrollEnabled()) {
     const nsContentView* view = GetRootContentView();
     BuildBackgroundPatternFor(mContainer,
                               shadowRoot,
                               view->GetViewConfig(),
                               mBackgroundColor,
                               aManager, aFrame);
   }
   mContainer->SetVisibleRegion(aVisibleRect);
   return nsRefPtr<Layer>(mContainer).forget();
 }
 void
 RenderFrameParent::OwnerContentChanged(nsIContent* aContent)
 {
   NS_ABORT_IF_FALSE(mFrameLoader->GetOwnerContent() == aContent,
                     "Don't build new map if owner is same!");
   BuildViewMap();
 }
 void
 RenderFrameParent::NotifyInputEvent(WidgetInputEvent& aEvent,
                                     ScrollableLayerGuid* aOutTargetGuid)
 {
   if (GetApzcTreeManager()) {
     GetApzcTreeManager()->ReceiveInputEvent(aEvent, aOutTargetGuid);
   }
 }
 void
 RenderFrameParent::ActorDestroy(ActorDestroyReason why)
 {
   if (mLayersId != 0) {
     CompositorParent::DeallocateLayerTreeId(mLayersId);
     if (mContentController) {
       // Stop our content controller from requesting repaints of our
       // content.
       mContentController->ClearRenderFrame();
       // TODO: notify the compositor?
     }
   }
   if (mFrameLoader && mFrameLoader->GetCurrentRemoteFrame() == this) {
     // XXX this might cause some weird issues ... we'll just not
     // redraw the part of the window covered by this until the "next"
     // remote frame has a layer-tree transaction.  For
     // why==NormalShutdown, we'll definitely want to do something
     // better, especially as nothing guarantees another Update() from
     // the "next" remote layer tree.
     mFrameLoader->SetCurrentRemoteFrame(nullptr);
   }
   mFrameLoader = nullptr;
 }
 bool
 RenderFrameParent::RecvNotifyCompositorTransaction()
 {
   TriggerRepaint();
   return true;
 }
 bool
 RenderFrameParent::RecvUpdateHitRegion(const nsRegion& aRegion)
 {
   mTouchRegion = aRegion;
   if (mContentController) {
     // Tell the content controller about the touch-sensitive region, so
     // that it can provide it to APZ. This is required for APZ to do
     // correct hit testing for a remote 'mozpasspointerevents' iframe
     // until bug 928833 is fixed.
     mContentController->SetTouchSensitiveRegion(aRegion);
   }
   return true;
 }
 PLayerTransactionParent*
 RenderFrameParent::AllocPLayerTransactionParent()
 {
   if (!mFrameLoader || mFrameLoaderDestroyed) {
     return nullptr;
   }
   nsRefPtr<LayerManager> lm = GetFrom(mFrameLoader);
   LayerTransactionParent* result = new LayerTransactionParent(lm->AsLayerManagerComposite(), this, 0);
   result->AddIPDLReference();
   return result;
 }
 bool
 RenderFrameParent::DeallocPLayerTransactionParent(PLayerTransactionParent* aLayers)
 {
   static_cast<LayerTransactionParent*>(aLayers)->ReleaseIPDLReference();
   return true;
 }
 void
 RenderFrameParent::BuildViewMap()
 {
   ViewMap newContentViews;
   // BuildViewMap assumes we have a primary frame, which may not be the case.
   if (GetRootLayer() && mFrameLoader->GetPrimaryFrameOfOwningContent()) {
     // Some of the content views in our hash map may no longer be active. To
     // tag them as inactive and to remove any chance of them using a dangling
     // pointer, we set mContentView to nullptr.
     //
     // BuildViewMap will restore mFrameLoader if the content view is still
     // in our hash table.
     for (ViewMap::const_iterator iter = mContentViews.begin();
          iter != mContentViews.end();
          ++iter) {
       iter->second->mFrameLoader = nullptr;
     }
     mozilla::layout::BuildViewMap(mContentViews, newContentViews, mFrameLoader, GetRootLayer());
   }
   // Here, we guarantee that *only* the root view is preserved in
   // case we couldn't build a new view map above. This is important because
   // the content view map should only contain the root view and content
   // views that are present in the layer tree.
   if (newContentViews.empty()) {
     nsContentView* rootView = FindRootView(mContentViews);
     if (rootView)
       newContentViews[rootView->GetId()] = rootView;
   }
   mContentViews = newContentViews;
 }
 void
 RenderFrameParent::TriggerRepaint()
 {
   mFrameLoader->SetCurrentRemoteFrame(this);
   nsIFrame* docFrame = mFrameLoader->GetPrimaryFrameOfOwningContent();
   if (!docFrame) {
     // Bad, but nothing we can do about it (XXX/cjones: or is there?
     // maybe bug 589337?).  When the new frame is created, we'll
     // probably still be the current render frame and will get to draw
     // our content then.  Or, we're shutting down and this update goes
     // to /dev/null.
     return;
   }
   docFrame->InvalidateLayer(nsDisplayItem::TYPE_REMOTE);
 }
 LayerTransactionParent*
 RenderFrameParent::GetShadowLayers() const
 {
   const InfallibleTArray<PLayerTransactionParent*>& shadowParents = ManagedPLayerTransactionParent();
   NS_ABORT_IF_FALSE(shadowParents.Length() <= 1,
                     "can only support at most 1 LayerTransactionParent");
   return (shadowParents.Length() == 1) ?
     static_cast<LayerTransactionParent*>(shadowParents[0]) : nullptr;
 }
 uint64_t
 RenderFrameParent::GetLayerTreeId() const
 {
   return mLayersId;
 }
 Layer*
 RenderFrameParent::GetRootLayer() const
 {
   LayerTransactionParent* shadowLayers = GetShadowLayers();
   return shadowLayers ? shadowLayers->GetRoot() : nullptr;
 }
 void
 RenderFrameParent::BuildDisplayList(nsDisplayListBuilder* aBuilder,
                                     nsSubDocumentFrame* aFrame,
                                     const nsRect& aDirtyRect,
                                     const nsDisplayListSet& aLists)
 {
   // We're the subdoc for <browser remote="true"> and it has
   // painted content.  Display its shadow layer tree.
   DisplayListClipState::AutoSaveRestore clipState(aBuilder);
   nsPoint offset = aBuilder->ToReferenceFrame(aFrame);
   nsRect bounds = aFrame->EnsureInnerView()->GetBounds() + offset;
   clipState.ClipContentDescendants(bounds);
   Layer* container = GetRootLayer();
   if (aBuilder->IsForEventDelivery() && container) {
     ViewTransform offset =
       ViewTransform(GetContentRectLayerOffset(aFrame, aBuilder));
     BuildListForLayer(container, mFrameLoader, offset,
                       aBuilder, *aLists.Content(), aFrame);
   } else {
     aLists.Content()->AppendToTop(
       new (aBuilder) nsDisplayRemote(aBuilder, aFrame, this));
   }
 }
 void
 RenderFrameParent::ZoomToRect(uint32_t aPresShellId, ViewID aViewId,
                               const CSSRect& aRect)
 {
   if (GetApzcTreeManager()) {
     GetApzcTreeManager()->ZoomToRect(ScrollableLayerGuid(mLayersId, aPresShellId, aViewId),
                                      aRect);
   }
 }
 void
 RenderFrameParent::ContentReceivedTouch(const ScrollableLayerGuid& aGuid,
                                         bool aPreventDefault)
 {
   if (aGuid.mLayersId != mLayersId) {
     // Guard against bad data from hijacked child processes
     NS_ERROR("Unexpected layers id in ContentReceivedTouch; dropping message...");
     return;
   }
   if (GetApzcTreeManager()) {
     GetApzcTreeManager()->ContentReceivedTouch(aGuid, aPreventDefault);
   }
 }
 void
 RenderFrameParent::UpdateZoomConstraints(uint32_t aPresShellId,
                                          ViewID aViewId,
                                          bool aIsRoot,
                                          const ZoomConstraints& aConstraints)
 {
   if (mContentController && aIsRoot) {
     mContentController->SaveZoomConstraints(aConstraints);
   }
   if (GetApzcTreeManager()) {
     GetApzcTreeManager()->UpdateZoomConstraints(ScrollableLayerGuid(mLayersId, aPresShellId, aViewId),
                                                 aConstraints);
   }
 }
 bool
 RenderFrameParent::HitTest(const nsRect& aRect)
 {
   return mTouchRegion.Contains(aRect);
 }
 }  // namespace layout
 }  // namespace mozilla
 already_AddRefed<Layer>
 nsDisplayRemote::BuildLayer(nsDisplayListBuilder* aBuilder,
                             LayerManager* aManager,
                             const ContainerLayerParameters& aContainerParameters)
 {
   int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
   nsIntRect visibleRect = GetVisibleRect().ToNearestPixels(appUnitsPerDevPixel);
   visibleRect += aContainerParameters.mOffset;
   nsRefPtr<Layer> layer = mRemoteFrame->BuildLayer(aBuilder, mFrame, aManager, visibleRect, this, aContainerParameters);
   return layer.forget();
 }
 void
 nsDisplayRemote::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
                          HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames)
 {
   if (mRemoteFrame->HitTest(aRect)) {
     aOutFrames->AppendElement(mFrame);
   }
 }
 void
 nsDisplayRemoteShadow::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
                          HitTestState* aState, nsTArray<nsIFrame*> *aOutFrames)
 {
   // If we are here, then rects have intersected.
   //
   // XXX I think iframes and divs can be rounded like anything else but we don't
   //     cover that case here.
   //
   if (aState->mShadows) {
     aState->mShadows->AppendElement(mId);
   }
 }

The Tor Browser / annotate

layout/ipc/RenderFrameParent.cpp@7e26c7da4463 (annotated)

layout/ipc/RenderFrameParent.cpp