gecko-dev/gfx/layers/ipc/CompositableTransactionParent.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "CompositableTransactionParent.h"
#include "CompositableHost.h"        // for CompositableParent, etc
#include "CompositorBridgeParent.h"  // for CompositorBridgeParent
#include "GLContext.h"               // for GLContext
#include "Layers.h"                  // for Layer
#include "RenderTrace.h"             // for RenderTraceInvalidateEnd, etc
#include "mozilla/Assertions.h"      // for MOZ_ASSERT, etc
#include "mozilla/RefPtr.h"          // for RefPtr
#include "mozilla/layers/CompositorTypes.h"
#include "mozilla/layers/ContentHost.h"        // for ContentHostBase
#include "mozilla/layers/ImageBridgeParent.h"  // for ImageBridgeParent
#include "mozilla/layers/LayerManagerComposite.h"
#include "mozilla/layers/LayersSurfaces.h"  // for SurfaceDescriptor
#include "mozilla/layers/LayersTypes.h"     // for MOZ_LAYERS_LOG
#include "mozilla/layers/TextureHost.h"     // for TextureHost
#include "mozilla/layers/TextureHostOGL.h"  // for TextureHostOGL
#include "mozilla/layers/TiledContentHost.h"
#include "mozilla/layers/PaintedLayerComposite.h"
#include "mozilla/mozalloc.h"  // for operator delete
#include "mozilla/Unused.h"
#include "nsDebug.h"   // for NS_WARNING, NS_ASSERTION
#include "nsRegion.h"  // for nsIntRegion

namespace mozilla {
namespace layers {

class ClientTiledLayerBuffer;
class Compositor;

// This function can in some cases fail and return false without it being a bug.
// This can theoretically happen if the ImageBridge sends frames before
// we created the layer tree. Since we can't enforce that the layer
// tree is already created before ImageBridge operates, there isn't much
// we can do about it, but in practice it is very rare.
// Typically when a tab with a video is dragged from a window to another,
// there can be a short time when the video is still sending frames
// asynchonously while the layer tree is not reconstructed. It's not a
// big deal.
// Note that Layers transactions do not need to call this because they always
// schedule the composition, in LayerManagerComposite::EndTransaction.
static bool ScheduleComposition(CompositableHost* aCompositable) {
  uint64_t id = aCompositable->GetCompositorBridgeID();
  if (!id) {
    return false;
  }
  CompositorBridgeParent* cp =
      CompositorBridgeParent::GetCompositorBridgeParent(id);
  if (!cp) {
    return false;
  }
  cp->ScheduleComposition();
  return true;
}

bool CompositableParentManager::ReceiveCompositableUpdate(
    const CompositableOperation& aEdit) {
  // Ignore all operations on compositables created on stale compositors. We
  // return true because the child is unable to handle errors.
  RefPtr<CompositableHost> compositable =
      FindCompositable(aEdit.compositable());
  if (!compositable) {
    return false;
  }
  return ReceiveCompositableUpdate(aEdit.detail(), WrapNotNull(compositable));
}

bool CompositableParentManager::ReceiveCompositableUpdate(
    const CompositableOperationDetail& aDetail,
    NotNull<CompositableHost*> aCompositable) {
  if (TextureSourceProvider* provider =
          aCompositable->GetTextureSourceProvider()) {
    if (!provider->IsValid()) {
      return false;
    }
  }

  switch (aDetail.type()) {
    case CompositableOperationDetail::TOpPaintTextureRegion: {
      MOZ_LAYERS_LOG(("[ParentSide] Paint PaintedLayer"));

      const OpPaintTextureRegion& op = aDetail.get_OpPaintTextureRegion();
      Layer* layer = aCompositable->GetLayer();
      if (!layer || layer->GetType() != Layer::TYPE_PAINTED) {
        return false;
      }
      PaintedLayerComposite* thebes =
          static_cast<PaintedLayerComposite*>(layer);

      const ThebesBufferData& bufferData = op.bufferData();

      RenderTraceInvalidateStart(thebes, "FF00FF",
                                 op.updatedRegion().GetBounds());

      if (!aCompositable->UpdateThebes(bufferData, op.updatedRegion(),
                                       thebes->GetValidRegion())) {
        return false;
      }

      RenderTraceInvalidateEnd(thebes, "FF00FF");
      break;
    }
    case CompositableOperationDetail::TOpUseTiledLayerBuffer: {
      MOZ_LAYERS_LOG(("[ParentSide] Paint TiledLayerBuffer"));
      const OpUseTiledLayerBuffer& op = aDetail.get_OpUseTiledLayerBuffer();
      TiledContentHost* tiledHost = aCompositable->AsTiledContentHost();

      NS_ASSERTION(tiledHost, "The compositable is not tiled");

      const SurfaceDescriptorTiles& tileDesc = op.tileLayerDescriptor();

      bool success = tiledHost->UseTiledLayerBuffer(this, tileDesc);

      const nsTArray<TileDescriptor>& tileDescriptors = tileDesc.tiles();
      for (size_t i = 0; i < tileDescriptors.Length(); i++) {
        const TileDescriptor& tileDesc = tileDescriptors[i];
        if (tileDesc.type() != TileDescriptor::TTexturedTileDescriptor) {
          continue;
        }
        const TexturedTileDescriptor& texturedDesc =
            tileDesc.get_TexturedTileDescriptor();
        RefPtr<TextureHost> texture =
            TextureHost::AsTextureHost(texturedDesc.textureParent());
        if (texture) {
          texture->SetLastFwdTransactionId(mFwdTransactionId);
          // Make sure that each texture was handled by the compositable
          // because the recycling logic depends on it.
          MOZ_ASSERT(texture->NumCompositableRefs() > 0);
        }
        if (texturedDesc.textureOnWhiteParent().isSome()) {
          texture = TextureHost::AsTextureHost(
              texturedDesc.textureOnWhiteParent().ref());
          if (texture) {
            texture->SetLastFwdTransactionId(mFwdTransactionId);
            // Make sure that each texture was handled by the compositable
            // because the recycling logic depends on it.
            MOZ_ASSERT(texture->NumCompositableRefs() > 0);
          }
        }
      }
      if (!success) {
        return false;
      }
      break;
    }
    case CompositableOperationDetail::TOpRemoveTexture: {
      const OpRemoveTexture& op = aDetail.get_OpRemoveTexture();

      RefPtr<TextureHost> tex = TextureHost::AsTextureHost(op.textureParent());

      MOZ_ASSERT(tex.get());
      aCompositable->RemoveTextureHost(tex);
      break;
    }
    case CompositableOperationDetail::TOpUseTexture: {
      const OpUseTexture& op = aDetail.get_OpUseTexture();

      AutoTArray<CompositableHost::TimedTexture, 4> textures;
      for (auto& timedTexture : op.textures()) {
        CompositableHost::TimedTexture* t = textures.AppendElement();
        t->mTexture = TextureHost::AsTextureHost(timedTexture.textureParent());
        MOZ_ASSERT(t->mTexture);
        t->mTimeStamp = timedTexture.timeStamp();
        t->mPictureRect = timedTexture.picture();
        t->mFrameID = timedTexture.frameID();
        t->mProducerID = timedTexture.producerID();
        if (timedTexture.readLocked()) {
          t->mTexture->SetReadLocked();
        }
      }
      if (textures.Length() > 0) {
        aCompositable->UseTextureHost(textures);

        for (auto& timedTexture : op.textures()) {
          RefPtr<TextureHost> texture =
              TextureHost::AsTextureHost(timedTexture.textureParent());
          if (texture) {
            texture->SetLastFwdTransactionId(mFwdTransactionId);
            // Make sure that each texture was handled by the compositable
            // because the recycling logic depends on it.
            MOZ_ASSERT(texture->NumCompositableRefs() > 0);
          }
        }
      }

      if (UsesImageBridge() && aCompositable->GetLayer()) {
        ScheduleComposition(aCompositable);
      }
      break;
    }
    case CompositableOperationDetail::TOpUseComponentAlphaTextures: {
      const OpUseComponentAlphaTextures& op =
          aDetail.get_OpUseComponentAlphaTextures();
      RefPtr<TextureHost> texOnBlack =
          TextureHost::AsTextureHost(op.textureOnBlackParent());
      RefPtr<TextureHost> texOnWhite =
          TextureHost::AsTextureHost(op.textureOnWhiteParent());
      if (op.readLockedBlack()) {
        texOnBlack->SetReadLocked();
      }
      if (op.readLockedWhite()) {
        texOnWhite->SetReadLocked();
      }

      MOZ_ASSERT(texOnBlack && texOnWhite);
      aCompositable->UseComponentAlphaTextures(texOnBlack, texOnWhite);

      if (texOnBlack) {
        texOnBlack->SetLastFwdTransactionId(mFwdTransactionId);
        // Make sure that each texture was handled by the compositable
        // because the recycling logic depends on it.
        MOZ_ASSERT(texOnBlack->NumCompositableRefs() > 0);
      }

      if (texOnWhite) {
        texOnWhite->SetLastFwdTransactionId(mFwdTransactionId);
        // Make sure that each texture was handled by the compositable
        // because the recycling logic depends on it.
        MOZ_ASSERT(texOnWhite->NumCompositableRefs() > 0);
      }

      if (UsesImageBridge()) {
        ScheduleComposition(aCompositable);
      }
      break;
    }
    default: {
      MOZ_ASSERT(false, "bad type");
    }
  }

  return true;
}

void CompositableParentManager::DestroyActor(const OpDestroy& aOp) {
  switch (aOp.type()) {
    case OpDestroy::TPTextureParent: {
      auto actor = aOp.get_PTextureParent();
      TextureHost::ReceivedDestroy(actor);
      break;
    }
    case OpDestroy::TCompositableHandle: {
      ReleaseCompositable(aOp.get_CompositableHandle());
      break;
    }
    default: {
      MOZ_ASSERT(false, "unsupported type");
    }
  }
}

RefPtr<CompositableHost> CompositableParentManager::AddCompositable(
    const CompositableHandle& aHandle, const TextureInfo& aInfo,
    bool aUseWebRender) {
  if (mCompositables.find(aHandle.Value()) != mCompositables.end()) {
    NS_ERROR("Client should not allocate duplicate handles");
    return nullptr;
  }
  if (!aHandle) {
    NS_ERROR("Client should not allocate 0 as a handle");
    return nullptr;
  }

  RefPtr<CompositableHost> host =
      CompositableHost::Create(aInfo, aUseWebRender);
  if (!host) {
    return nullptr;
  }

  mCompositables[aHandle.Value()] = host;
  return host;
}

RefPtr<CompositableHost> CompositableParentManager::FindCompositable(
    const CompositableHandle& aHandle, bool aAllowDisablingWebRender) {
  auto iter = mCompositables.find(aHandle.Value());
  if (iter == mCompositables.end()) {
    return nullptr;
  }

  RefPtr<CompositableHost> host = iter->second;
  if (!aAllowDisablingWebRender) {
    return host;
  }

  if (!host->AsWebRenderImageHost() || !host->GetAsyncRef()) {
    return host;
  }

  // Try to replace WebRenderImageHost of ImageBridge to ImageHost.
  RefPtr<CompositableHost> newHost = CompositableHost::Create(
      host->GetTextureInfo(), /* aUseWebRender */ false);
  if (!newHost || !newHost->AsImageHost()) {
    MOZ_ASSERT_UNREACHABLE("unexpected to be called");
    return host;
  }

  newHost->SetAsyncRef(host->GetAsyncRef());
  mCompositables[aHandle.Value()] = newHost;

  return newHost;
}

void CompositableParentManager::ReleaseCompositable(
    const CompositableHandle& aHandle) {
  auto iter = mCompositables.find(aHandle.Value());
  if (iter == mCompositables.end()) {
    return;
  }

  RefPtr<CompositableHost> host = iter->second;
  mCompositables.erase(iter);

  host->Detach(nullptr, CompositableHost::FORCE_DETACH);
}

}  // namespace layers
}  // namespace mozilla