The Tor Browser: gfx/layers/composite/ContainerLayerComposite.cpp@6474c204b198 (annotated)

gfx/layers/composite/ContainerLayerComposite.cpp@6474c204b198 (annotated)

gfx/layers/composite/ContainerLayerComposite.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 20; 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/. */
 #include "ContainerLayerComposite.h"
 #include <algorithm>                    // for min
 #include "FrameMetrics.h"               // for FrameMetrics
 #include "Units.h"                      // for LayerRect, LayerPixel, etc
 #include "gfx2DGlue.h"                  // for ToMatrix4x4
 #include "gfx3DMatrix.h"                // for gfx3DMatrix
 #include "gfxPrefs.h"                   // for gfxPrefs
 #include "gfxUtils.h"                   // for gfxUtils, etc
 #include "mozilla/Assertions.h"         // for MOZ_ASSERT, etc
 #include "mozilla/RefPtr.h"             // for RefPtr
 #include "mozilla/gfx/BaseRect.h"       // for BaseRect
 #include "mozilla/gfx/Matrix.h"         // for Matrix4x4
 #include "mozilla/gfx/Point.h"          // for Point, IntPoint
 #include "mozilla/gfx/Rect.h"           // for IntRect, Rect
 #include "mozilla/layers/Compositor.h"  // for Compositor, etc
 #include "mozilla/layers/CompositorTypes.h"  // for DIAGNOSTIC_CONTAINER
 #include "mozilla/layers/Effects.h"     // for Effect, EffectChain, etc
 #include "mozilla/layers/TextureHost.h"  // for CompositingRenderTarget
 #include "mozilla/mozalloc.h"           // for operator delete, etc
 #include "nsAutoPtr.h"                  // for nsRefPtr
 #include "nsDebug.h"                    // for NS_ASSERTION
 #include "nsISupportsImpl.h"            // for MOZ_COUNT_CTOR, etc
 #include "nsISupportsUtils.h"           // for NS_ADDREF, NS_RELEASE
 #include "nsPoint.h"                    // for nsIntPoint
 #include "nsRect.h"                     // for nsIntRect
 #include "nsRegion.h"                   // for nsIntRegion
 #include "nsTArray.h"                   // for nsAutoTArray
 #include "TextRenderer.h"               // for TextRenderer
 #include <vector>
 namespace mozilla {
 namespace layers {
 /**
  * Returns a rectangle of content painted opaquely by aLayer. Very consertative;
  * bails by returning an empty rect in any tricky situations.
  */
 static nsIntRect
 GetOpaqueRect(Layer* aLayer)
 {
   nsIntRect result;
   gfx::Matrix matrix;
   bool is2D = aLayer->GetBaseTransform().Is2D(&matrix);
   // Just bail if there's anything difficult to handle.
   if (!is2D || aLayer->GetMaskLayer() ||
     aLayer->GetEffectiveOpacity() != 1.0f ||
     matrix.HasNonIntegerTranslation()) {
     return result;
   }
   if (aLayer->GetContentFlags() & Layer::CONTENT_OPAQUE) {
     result = aLayer->GetEffectiveVisibleRegion().GetLargestRectangle();
   } else {
     // Drill down into RefLayers because that's what we particularly care about;
     // layer construction for aLayer will not have known about the opaqueness
     // of any RefLayer subtrees.
     RefLayer* refLayer = aLayer->AsRefLayer();
     if (refLayer && refLayer->GetFirstChild()) {
       result = GetOpaqueRect(refLayer->GetFirstChild());
     }
   }
   // Translate our opaque region to cover the child
   gfx::Point point = matrix.GetTranslation();
   result.MoveBy(static_cast<int>(point.x), static_cast<int>(point.y));
   const nsIntRect* clipRect = aLayer->GetEffectiveClipRect();
   if (clipRect) {
     result.IntersectRect(result, *clipRect);
   }
   return result;
 }
 struct LayerVelocityUserData : public LayerUserData {
 public:
   LayerVelocityUserData() {
     MOZ_COUNT_CTOR(LayerVelocityUserData);
   }
   ~LayerVelocityUserData() {
     MOZ_COUNT_DTOR(LayerVelocityUserData);
   }
   struct VelocityData {
     VelocityData(TimeStamp frameTime, int scrollX, int scrollY)
       : mFrameTime(frameTime)
       , mPoint(scrollX, scrollY)
     {}
     TimeStamp mFrameTime;
     gfx::Point mPoint;
   };
   std::vector<VelocityData> mData;
 };
 static gfx::Point GetScrollData(Layer* aLayer) {
   gfx::Matrix matrix;
   if (aLayer->GetLocalTransform().Is2D(&matrix)) {
     return matrix.GetTranslation();
   }
   gfx::Point origin;
   return origin;
 }
 static void DrawLayerInfo(const nsIntRect& aClipRect,
                           LayerManagerComposite* aManager,
                           Layer* aLayer)
 {
   if (aLayer->GetType() == Layer::LayerType::TYPE_CONTAINER) {
     // XXX - should figure out a way to render this, but for now this
     // is hard to do, since it will often get superimposed over the first
     // child of the layer, which is bad.
     return;
   }
   nsAutoCString layerInfo;
   aLayer->PrintInfo(layerInfo, "");
   nsIntRegion visibleRegion = aLayer->GetVisibleRegion();
   uint32_t maxWidth = std::min<uint32_t>(visibleRegion.GetBounds().width, 500);
   nsIntPoint topLeft = visibleRegion.GetBounds().TopLeft();
   aManager->GetTextRenderer()->RenderText(layerInfo.get(), gfx::IntPoint(topLeft.x, topLeft.y),
                                           aLayer->GetEffectiveTransform(), 16,
                                           maxWidth);
 }
 static LayerVelocityUserData* GetVelocityData(Layer* aLayer) {
   static char sLayerVelocityUserDataKey;
   void* key = reinterpret_cast<void*>(&sLayerVelocityUserDataKey);
   if (!aLayer->HasUserData(key)) {
     LayerVelocityUserData* newData = new LayerVelocityUserData();
     aLayer->SetUserData(key, newData);
   }
   return static_cast<LayerVelocityUserData*>(aLayer->GetUserData(key));
 }
 static void DrawVelGraph(const nsIntRect& aClipRect,
                          LayerManagerComposite* aManager,
                          Layer* aLayer) {
   Compositor* compositor = aManager->GetCompositor();
   gfx::Rect clipRect(aClipRect.x, aClipRect.y,
                      aClipRect.width, aClipRect.height);
   TimeStamp now = TimeStamp::Now();
   LayerVelocityUserData* velocityData = GetVelocityData(aLayer);
   if (velocityData->mData.size() >= 1 &&
     now > velocityData->mData[velocityData->mData.size() - 1].mFrameTime +
       TimeDuration::FromMilliseconds(200)) {
     // clear stale data
     velocityData->mData.clear();
   }
   const gfx::Point layerTransform = GetScrollData(aLayer);
   velocityData->mData.push_back(
     LayerVelocityUserData::VelocityData(now,
       static_cast<int>(layerTransform.x), static_cast<int>(layerTransform.y)));
   // TODO: dump to file
   // XXX: Uncomment these lines to enable ScrollGraph logging. This is
   //      useful for HVGA phones or to output the data to accurate
   //      graphing software.
   // printf_stderr("ScrollGraph (%p): %f, %f\n",
   // aLayer, layerTransform.x, layerTransform.y);
   // Keep a circular buffer of 100.
   size_t circularBufferSize = 100;
   if (velocityData->mData.size() > circularBufferSize) {
     velocityData->mData.erase(velocityData->mData.begin());
   }
   if (velocityData->mData.size() == 1) {
     return;
   }
   // Clear and disable the graph when it's flat
   for (size_t i = 1; i < velocityData->mData.size(); i++) {
     if (velocityData->mData[i - 1].mPoint != velocityData->mData[i].mPoint) {
       break;
     }
     if (i == velocityData->mData.size() - 1) {
       velocityData->mData.clear();
       return;
     }
   }
   if (aLayer->GetEffectiveVisibleRegion().GetBounds().width < 300 ||
       aLayer->GetEffectiveVisibleRegion().GetBounds().height < 300) {
     // Don't want a graph for smaller layers
     return;
   }
   aManager->SetDebugOverlayWantsNextFrame(true);
   const gfx::Matrix4x4& transform = aLayer->GetEffectiveTransform();
   nsIntRect bounds = aLayer->GetEffectiveVisibleRegion().GetBounds();
   gfx::Rect graphBounds = gfx::Rect(bounds.x, bounds.y,
                                     bounds.width, bounds.height);
   gfx::Rect graphRect = gfx::Rect(bounds.x, bounds.y, 200, 100);
   float opacity = 1.0;
   EffectChain effects;
   effects.mPrimaryEffect = new EffectSolidColor(gfx::Color(0.2f,0,0,1));
   compositor->DrawQuad(graphRect,
                        clipRect,
                        effects,
                        opacity,
                        transform);
   std::vector<gfx::Point> graph;
   int yScaleFactor = 3;
   for (int32_t i = (int32_t)velocityData->mData.size() - 2; i >= 0; i--) {
     const gfx::Point& p1 = velocityData->mData[i+1].mPoint;
     const gfx::Point& p2 = velocityData->mData[i].mPoint;
     int vel = sqrt((p1.x - p2.x) * (p1.x - p2.x) +
                    (p1.y - p2.y) * (p1.y - p2.y));
     graph.push_back(
       gfx::Point(bounds.x + graphRect.width / circularBufferSize * i,
                  graphBounds.y + graphRect.height - vel/yScaleFactor));
   }
   compositor->DrawLines(graph, clipRect, gfx::Color(0,1,0,1),
                         opacity, transform);
 }
 // ContainerRender is shared between RefLayer and ContainerLayer
 template<class ContainerT> void
 ContainerRender(ContainerT* aContainer,
                 LayerManagerComposite* aManager,
                 const nsIntRect& aClipRect)
 {
   /**
    * Setup our temporary surface for rendering the contents of this container.
    */
   RefPtr<CompositingRenderTarget> surface;
   Compositor* compositor = aManager->GetCompositor();
   RefPtr<CompositingRenderTarget> previousTarget = compositor->GetCurrentRenderTarget();
   nsIntRect visibleRect = aContainer->GetEffectiveVisibleRegion().GetBounds();
   aContainer->mSupportsComponentAlphaChildren = false;
   float opacity = aContainer->GetEffectiveOpacity();
   bool needsSurface = aContainer->UseIntermediateSurface();
   if (needsSurface) {
     SurfaceInitMode mode = INIT_MODE_CLEAR;
     bool surfaceCopyNeeded = false;
     gfx::IntRect surfaceRect = gfx::IntRect(visibleRect.x, visibleRect.y,
                                             visibleRect.width, visibleRect.height);
     gfx::IntPoint sourcePoint = gfx::IntPoint(visibleRect.x, visibleRect.y);
     // we're about to create a framebuffer backed by textures to use as an intermediate
     // surface. What to do if its size (as given by framebufferRect) would exceed the
     // maximum texture size supported by the GL? The present code chooses the compromise
     // of just clamping the framebuffer's size to the max supported size.
     // This gives us a lower resolution rendering of the intermediate surface (children layers).
     // See bug 827170 for a discussion.
     int32_t maxTextureSize = compositor->GetMaxTextureSize();
     surfaceRect.width = std::min(maxTextureSize, surfaceRect.width);
     surfaceRect.height = std::min(maxTextureSize, surfaceRect.height);
     if (aContainer->GetEffectiveVisibleRegion().GetNumRects() == 1 &&
         (aContainer->GetContentFlags() & Layer::CONTENT_OPAQUE))
     {
       // don't need a background, we're going to paint all opaque stuff
       aContainer->mSupportsComponentAlphaChildren = true;
       mode = INIT_MODE_NONE;
     } else {
       const gfx::Matrix4x4& transform3D = aContainer->GetEffectiveTransform();
       gfx::Matrix transform;
       // If we have an opaque ancestor layer, then we can be sure that
       // all the pixels we draw into are either opaque already or will be
       // covered by something opaque. Otherwise copying up the background is
       // not safe.
       if (ContainerLayer::HasOpaqueAncestorLayer(aContainer) &&
           transform3D.Is2D(&transform) && !ThebesMatrix(transform).HasNonIntegerTranslation()) {
         surfaceCopyNeeded = gfxPrefs::ComponentAlphaEnabled();
         sourcePoint.x += transform._31;
         sourcePoint.y += transform._32;
         aContainer->mSupportsComponentAlphaChildren
           = gfxPrefs::ComponentAlphaEnabled();
       }
     }
     sourcePoint -= compositor->GetCurrentRenderTarget()->GetOrigin();
     if (surfaceCopyNeeded) {
       surface = compositor->CreateRenderTargetFromSource(surfaceRect, previousTarget, sourcePoint);
     } else {
       surface = compositor->CreateRenderTarget(surfaceRect, mode);
     }
     if (!surface) {
       return;
     }
     compositor->SetRenderTarget(surface);
   } else {
     surface = previousTarget;
     aContainer->mSupportsComponentAlphaChildren = (aContainer->GetContentFlags() & Layer::CONTENT_OPAQUE) ||
       (aContainer->GetParent() && aContainer->GetParent()->SupportsComponentAlphaChildren());
   }
   nsAutoTArray<Layer*, 12> children;
   aContainer->SortChildrenBy3DZOrder(children);
   /**
    * Render this container's contents.
    */
   for (uint32_t i = 0; i < children.Length(); i++) {
     LayerComposite* layerToRender = static_cast<LayerComposite*>(children.ElementAt(i)->ImplData());
     if (layerToRender->GetLayer()->GetEffectiveVisibleRegion().IsEmpty() &&
         !layerToRender->GetLayer()->AsContainerLayer()) {
       continue;
     }
     nsIntRect clipRect = layerToRender->GetLayer()->
         CalculateScissorRect(aClipRect, &aManager->GetWorldTransform());
     if (clipRect.IsEmpty()) {
       continue;
     }
     nsIntRegion savedVisibleRegion;
     bool restoreVisibleRegion = false;
     if (i + 1 < children.Length() &&
         layerToRender->GetLayer()->GetEffectiveTransform().IsIdentity()) {
       LayerComposite* nextLayer = static_cast<LayerComposite*>(children.ElementAt(i + 1)->ImplData());
       nsIntRect nextLayerOpaqueRect;
       if (nextLayer && nextLayer->GetLayer()) {
         nextLayerOpaqueRect = GetOpaqueRect(nextLayer->GetLayer());
       }
       if (!nextLayerOpaqueRect.IsEmpty()) {
         savedVisibleRegion = layerToRender->GetShadowVisibleRegion();
         nsIntRegion visibleRegion;
         visibleRegion.Sub(savedVisibleRegion, nextLayerOpaqueRect);
         if (visibleRegion.IsEmpty()) {
           continue;
         }
         layerToRender->SetShadowVisibleRegion(visibleRegion);
         restoreVisibleRegion = true;
       }
     }
     if (layerToRender->HasLayerBeenComposited()) {
       // Composer2D will compose this layer so skip GPU composition
       // this time & reset composition flag for next composition phase
       layerToRender->SetLayerComposited(false);
       nsIntRect clearRect = layerToRender->GetClearRect();
       if (!clearRect.IsEmpty()) {
         // Clear layer's visible rect on FrameBuffer with transparent pixels
         gfx::Rect fbRect(clearRect.x, clearRect.y, clearRect.width, clearRect.height);
         compositor->ClearRect(fbRect);
         layerToRender->SetClearRect(nsIntRect(0, 0, 0, 0));
       }
     } else {
       layerToRender->RenderLayer(clipRect);
     }
     if (restoreVisibleRegion) {
       // Restore the region in case it's not covered by opaque content next time
       layerToRender->SetShadowVisibleRegion(savedVisibleRegion);
     }
     if (gfxPrefs::LayersScrollGraph()) {
       DrawVelGraph(clipRect, aManager, layerToRender->GetLayer());
     }
     if (gfxPrefs::DrawLayerInfo()) {
       DrawLayerInfo(clipRect, aManager, layerToRender->GetLayer());
     }
     // invariant: our GL context should be current here, I don't think we can
     // assert it though
   }
   if (needsSurface) {
     // Unbind the current surface and rebind the previous one.
 #ifdef MOZ_DUMP_PAINTING
     if (gfxUtils::sDumpPainting) {
       RefPtr<gfx::DataSourceSurface> surf = surface->Dump(aManager->GetCompositor());
       WriteSnapshotToDumpFile(aContainer, surf);
     }
 #endif
     compositor->SetRenderTarget(previousTarget);
     EffectChain effectChain(aContainer);
     LayerManagerComposite::AutoAddMaskEffect autoMaskEffect(aContainer->GetMaskLayer(),
                                                             effectChain,
                                                             !aContainer->GetTransform().CanDraw2D());
     effectChain.mPrimaryEffect = new EffectRenderTarget(surface);
     gfx::Rect rect(visibleRect.x, visibleRect.y, visibleRect.width, visibleRect.height);
     gfx::Rect clipRect(aClipRect.x, aClipRect.y, aClipRect.width, aClipRect.height);
     aManager->GetCompositor()->DrawQuad(rect, clipRect, effectChain, opacity,
                                         aContainer->GetEffectiveTransform());
   }
   if (aContainer->GetFrameMetrics().IsScrollable()) {
     const FrameMetrics& frame = aContainer->GetFrameMetrics();
     LayerRect layerBounds = ParentLayerRect(frame.mCompositionBounds) * ParentLayerToLayerScale(1.0);
     gfx::Rect rect(layerBounds.x, layerBounds.y, layerBounds.width, layerBounds.height);
     gfx::Rect clipRect(aClipRect.x, aClipRect.y, aClipRect.width, aClipRect.height);
     aManager->GetCompositor()->DrawDiagnostics(DIAGNOSTIC_CONTAINER,
                                                rect, clipRect,
                                                aContainer->GetEffectiveTransform());
   }
 }
 ContainerLayerComposite::ContainerLayerComposite(LayerManagerComposite *aManager)
   : ContainerLayer(aManager, nullptr)
   , LayerComposite(aManager)
 {
   MOZ_COUNT_CTOR(ContainerLayerComposite);
   mImplData = static_cast<LayerComposite*>(this);
 }
 ContainerLayerComposite::~ContainerLayerComposite()
 {
   MOZ_COUNT_DTOR(ContainerLayerComposite);
   // We don't Destroy() on destruction here because this destructor
   // can be called after remote content has crashed, and it may not be
   // safe to free the IPC resources of our children.  Those resources
   // are automatically cleaned up by IPDL-generated code.
   //
   // In the common case of normal shutdown, either
   // LayerManagerComposite::Destroy(), a parent
   // *ContainerLayerComposite::Destroy(), or Disconnect() will trigger
   // cleanup of our resources.
   while (mFirstChild) {
     RemoveChild(mFirstChild);
   }
 }
 void
 ContainerLayerComposite::Destroy()
 {
   if (!mDestroyed) {
     while (mFirstChild) {
       static_cast<LayerComposite*>(GetFirstChild()->ImplData())->Destroy();
       RemoveChild(mFirstChild);
     }
     mDestroyed = true;
   }
 }
 LayerComposite*
 ContainerLayerComposite::GetFirstChildComposite()
 {
   if (!mFirstChild) {
     return nullptr;
    }
   return static_cast<LayerComposite*>(mFirstChild->ImplData());
 }
 void
 ContainerLayerComposite::RenderLayer(const nsIntRect& aClipRect)
 {
   ContainerRender(this, mCompositeManager, aClipRect);
 }
 void
 ContainerLayerComposite::CleanupResources()
 {
   for (Layer* l = GetFirstChild(); l; l = l->GetNextSibling()) {
     LayerComposite* layerToCleanup = static_cast<LayerComposite*>(l->ImplData());
     layerToCleanup->CleanupResources();
   }
 }
 RefLayerComposite::RefLayerComposite(LayerManagerComposite* aManager)
   : RefLayer(aManager, nullptr)
   , LayerComposite(aManager)
 {
   mImplData = static_cast<LayerComposite*>(this);
 }
 RefLayerComposite::~RefLayerComposite()
 {
   Destroy();
 }
 void
 RefLayerComposite::Destroy()
 {
   MOZ_ASSERT(!mFirstChild);
   mDestroyed = true;
 }
 LayerComposite*
 RefLayerComposite::GetFirstChildComposite()
 {
   if (!mFirstChild) {
     return nullptr;
    }
   return static_cast<LayerComposite*>(mFirstChild->ImplData());
 }
 void
 RefLayerComposite::RenderLayer(const nsIntRect& aClipRect)
 {
   ContainerRender(this, mCompositeManager, aClipRect);
 }
 void
 RefLayerComposite::CleanupResources()
 {
 }
 } /* layers */
 } /* mozilla */

The Tor Browser / annotate

gfx/layers/composite/ContainerLayerComposite.cpp@6474c204b198 (annotated)

gfx/layers/composite/ContainerLayerComposite.cpp