Remove parts of //cc we aren't using

cc/resources/one_copy_tile_task_worker_pool.cc

Index: cc/resources/one_copy_tile_task_worker_pool.cc
diff --git a/cc/resources/one_copy_tile_task_worker_pool.cc b/cc/resources/one_copy_tile_task_worker_pool.cc
deleted file mode 100644
index 1139fbeb507bc2aeb9f91d9f5e4e056c4c32eccf..0000000000000000000000000000000000000000
--- a/cc/resources/one_copy_tile_task_worker_pool.cc
+++ /dev/null
@@ -1,507 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "cc/resources/one_copy_tile_task_worker_pool.h"
-
-#include <algorithm>
-#include <limits>
-
-#include "base/strings/stringprintf.h"
-#include "base/trace_event/trace_event.h"
-#include "base/trace_event/trace_event_argument.h"
-#include "cc/debug/traced_value.h"
-#include "cc/resources/raster_buffer.h"
-#include "cc/resources/resource_pool.h"
-#include "cc/resources/scoped_resource.h"
-#include "gpu/command_buffer/client/gles2_interface.h"
-#include "ui/gfx/gpu_memory_buffer.h"
-
-namespace cc {
-namespace {
-
-class RasterBufferImpl : public RasterBuffer {
- public:
-  RasterBufferImpl(OneCopyTileTaskWorkerPool* worker_pool,
-                   ResourceProvider* resource_provider,
-                   ResourcePool* resource_pool,
-                   ResourceFormat resource_format,
-                   const Resource* resource)
-      : worker_pool_(worker_pool),
-        resource_provider_(resource_provider),
-        resource_pool_(resource_pool),
-        resource_(resource),
-        raster_resource_(
-            resource_pool->AcquireResource(resource->size(), resource_format)),
-        lock_(new ResourceProvider::ScopedWriteLockGpuMemoryBuffer(
-            resource_provider_,
-            raster_resource_->id())),
-        sequence_(0) {}
-
-  ~RasterBufferImpl() override {
-    // Release write lock in case a copy was never scheduled.
-    lock_.reset();
-
-    // Make sure any scheduled copy operations are issued before we release the
-    // raster resource.
-    if (sequence_)
-      worker_pool_->AdvanceLastIssuedCopyTo(sequence_);
-
-    // Return raster resource to pool so it can be used by another RasterBuffer
-    // instance.
-    if (raster_resource_)
-      resource_pool_->ReleaseResource(raster_resource_.Pass());
-  }
-
-  // Overridden from RasterBuffer:
-  void Playback(const RasterSource* raster_source,
-                const gfx::Rect& rect,
-                float scale) override {
-    sequence_ = worker_pool_->PlaybackAndScheduleCopyOnWorkerThread(
-        lock_.Pass(), raster_resource_.Pass(), resource_, raster_source, rect,
-        scale);
-  }
-
- private:
-  OneCopyTileTaskWorkerPool* worker_pool_;
-  ResourceProvider* resource_provider_;
-  ResourcePool* resource_pool_;
-  const Resource* resource_;
-  scoped_ptr<ScopedResource> raster_resource_;
-  scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer> lock_;
-  CopySequenceNumber sequence_;
-
-  DISALLOW_COPY_AND_ASSIGN(RasterBufferImpl);
-};
-
-// Flush interval when performing copy operations.
-const int kCopyFlushPeriod = 4;
-
-// Number of in-flight copy operations to allow.
-const int kMaxCopyOperations = 32;
-
-// Delay been checking for copy operations to complete.
-const int kCheckForCompletedCopyOperationsTickRateMs = 1;
-
-// Number of failed attempts to allow before we perform a check that will
-// wait for copy operations to complete if needed.
-const int kFailedAttemptsBeforeWaitIfNeeded = 256;
-
-}  // namespace
-
-OneCopyTileTaskWorkerPool::CopyOperation::CopyOperation(
-    scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer> write_lock,
-    scoped_ptr<ScopedResource> src,
-    const Resource* dst)
-    : write_lock(write_lock.Pass()), src(src.Pass()), dst(dst) {
-}
-
-OneCopyTileTaskWorkerPool::CopyOperation::~CopyOperation() {
-}
-
-// static
-scoped_ptr<TileTaskWorkerPool> OneCopyTileTaskWorkerPool::Create(
-    base::SequencedTaskRunner* task_runner,
-    TaskGraphRunner* task_graph_runner,
-    ContextProvider* context_provider,
-    ResourceProvider* resource_provider,
-    ResourcePool* resource_pool) {
-  return make_scoped_ptr<TileTaskWorkerPool>(new OneCopyTileTaskWorkerPool(
-      task_runner, task_graph_runner, context_provider, resource_provider,
-      resource_pool));
-}
-
-OneCopyTileTaskWorkerPool::OneCopyTileTaskWorkerPool(
-    base::SequencedTaskRunner* task_runner,
-    TaskGraphRunner* task_graph_runner,
-    ContextProvider* context_provider,
-    ResourceProvider* resource_provider,
-    ResourcePool* resource_pool)
-    : task_runner_(task_runner),
-      task_graph_runner_(task_graph_runner),
-      namespace_token_(task_graph_runner->GetNamespaceToken()),
-      context_provider_(context_provider),
-      resource_provider_(resource_provider),
-      resource_pool_(resource_pool),
-      last_issued_copy_operation_(0),
-      last_flushed_copy_operation_(0),
-      lock_(),
-      copy_operation_count_cv_(&lock_),
-      scheduled_copy_operation_count_(0),
-      issued_copy_operation_count_(0),
-      next_copy_operation_sequence_(1),
-      check_for_completed_copy_operations_pending_(false),
-      shutdown_(false),
-      weak_ptr_factory_(this),
-      task_set_finished_weak_ptr_factory_(this) {
-  DCHECK(context_provider_);
-}
-
-OneCopyTileTaskWorkerPool::~OneCopyTileTaskWorkerPool() {
-  DCHECK_EQ(scheduled_copy_operation_count_, 0u);
-}
-
-TileTaskRunner* OneCopyTileTaskWorkerPool::AsTileTaskRunner() {
-  return this;
-}
-
-void OneCopyTileTaskWorkerPool::SetClient(TileTaskRunnerClient* client) {
-  client_ = client;
-}
-
-void OneCopyTileTaskWorkerPool::Shutdown() {
-  TRACE_EVENT0("cc", "OneCopyTileTaskWorkerPool::Shutdown");
-
-  {
-    base::AutoLock lock(lock_);
-
-    shutdown_ = true;
-    copy_operation_count_cv_.Signal();
-  }
-
-  TaskGraph empty;
-  task_graph_runner_->ScheduleTasks(namespace_token_, &empty);
-  task_graph_runner_->WaitForTasksToFinishRunning(namespace_token_);
-}
-
-void OneCopyTileTaskWorkerPool::ScheduleTasks(TileTaskQueue* queue) {
-  TRACE_EVENT0("cc", "OneCopyTileTaskWorkerPool::ScheduleTasks");
-
-#if DCHECK_IS_ON()
-  {
-    base::AutoLock lock(lock_);
-    DCHECK(!shutdown_);
-  }
-#endif
-
-  if (tasks_pending_.none())
-    TRACE_EVENT_ASYNC_BEGIN0("cc", "ScheduledTasks", this);
-
-  // Mark all task sets as pending.
-  tasks_pending_.set();
-
-  unsigned priority = kTileTaskPriorityBase;
-
-  graph_.Reset();
-
-  // Cancel existing OnTaskSetFinished callbacks.
-  task_set_finished_weak_ptr_factory_.InvalidateWeakPtrs();
-
-  scoped_refptr<TileTask> new_task_set_finished_tasks[kNumberOfTaskSets];
-
-  size_t task_count[kNumberOfTaskSets] = {0};
-
-  for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; ++task_set) {
-    new_task_set_finished_tasks[task_set] = CreateTaskSetFinishedTask(
-        task_runner_.get(),
-        base::Bind(&OneCopyTileTaskWorkerPool::OnTaskSetFinished,
-                   task_set_finished_weak_ptr_factory_.GetWeakPtr(), task_set));
-  }
-
-  resource_pool_->CheckBusyResources(false);
-
-  for (TileTaskQueue::Item::Vector::const_iterator it = queue->items.begin();
-       it != queue->items.end(); ++it) {
-    const TileTaskQueue::Item& item = *it;
-    RasterTask* task = item.task;
-    DCHECK(!task->HasCompleted());
-
-    for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; ++task_set) {
-      if (!item.task_sets[task_set])
-        continue;
-
-      ++task_count[task_set];
-
-      graph_.edges.push_back(
-          TaskGraph::Edge(task, new_task_set_finished_tasks[task_set].get()));
-    }
-
-    InsertNodesForRasterTask(&graph_, task, task->dependencies(), priority++);
-  }
-
-  for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; ++task_set) {
-    InsertNodeForTask(&graph_, new_task_set_finished_tasks[task_set].get(),
-                      kTaskSetFinishedTaskPriorityBase + task_set,
-                      task_count[task_set]);
-  }
-
-  ScheduleTasksOnOriginThread(this, &graph_);
-  task_graph_runner_->ScheduleTasks(namespace_token_, &graph_);
-
-  std::copy(new_task_set_finished_tasks,
-            new_task_set_finished_tasks + kNumberOfTaskSets,
-            task_set_finished_tasks_);
-
-  resource_pool_->ReduceResourceUsage();
-
-  TRACE_EVENT_ASYNC_STEP_INTO1("cc", "ScheduledTasks", this, "running", "state",
-                               StateAsValue());
-}
-
-void OneCopyTileTaskWorkerPool::CheckForCompletedTasks() {
-  TRACE_EVENT0("cc", "OneCopyTileTaskWorkerPool::CheckForCompletedTasks");
-
-  task_graph_runner_->CollectCompletedTasks(namespace_token_,
-                                            &completed_tasks_);
-
-  for (Task::Vector::const_iterator it = completed_tasks_.begin();
-       it != completed_tasks_.end(); ++it) {
-    TileTask* task = static_cast<TileTask*>(it->get());
-
-    task->WillComplete();
-    task->CompleteOnOriginThread(this);
-    task->DidComplete();
-
-    task->RunReplyOnOriginThread();
-  }
-  completed_tasks_.clear();
-}
-
-ResourceFormat OneCopyTileTaskWorkerPool::GetResourceFormat() {
-  return resource_provider_->best_texture_format();
-}
-
-scoped_ptr<RasterBuffer> OneCopyTileTaskWorkerPool::AcquireBufferForRaster(
-    const Resource* resource) {
-  DCHECK_EQ(resource->format(), resource_provider_->best_texture_format());
-  return make_scoped_ptr<RasterBuffer>(
-      new RasterBufferImpl(this, resource_provider_, resource_pool_,
-                           resource_provider_->best_texture_format(),
-                           resource));
-}
-
-void OneCopyTileTaskWorkerPool::ReleaseBufferForRaster(
-    scoped_ptr<RasterBuffer> buffer) {
-  // Nothing to do here. RasterBufferImpl destructor cleans up after itself.
-}
-
-CopySequenceNumber
-OneCopyTileTaskWorkerPool::PlaybackAndScheduleCopyOnWorkerThread(
-    scoped_ptr<ResourceProvider::ScopedWriteLockGpuMemoryBuffer> write_lock,
-    scoped_ptr<ScopedResource> src,
-    const Resource* dst,
-    const RasterSource* raster_source,
-    const gfx::Rect& rect,
-    float scale) {
-  base::AutoLock lock(lock_);
-
-  int failed_attempts = 0;
-  while ((scheduled_copy_operation_count_ + issued_copy_operation_count_) >=
-         kMaxCopyOperations) {
-    // Ignore limit when shutdown is set.
-    if (shutdown_)
-      break;
-
-    ++failed_attempts;
-
-    // Schedule a check that will also wait for operations to complete
-    // after too many failed attempts.
-    bool wait_if_needed = failed_attempts > kFailedAttemptsBeforeWaitIfNeeded;
-
-    // Schedule a check for completed copy operations if too many operations
-    // are currently in-flight.
-    ScheduleCheckForCompletedCopyOperationsWithLockAcquired(wait_if_needed);
-
-    {
-      TRACE_EVENT0("cc", "WaitingForCopyOperationsToComplete");
-
-      // Wait for in-flight copy operations to drop below limit.
-      copy_operation_count_cv_.Wait();
-    }
-  }
-
-  // Increment |scheduled_copy_operation_count_| before releasing |lock_|.
-  ++scheduled_copy_operation_count_;
-
-  // There may be more work available, so wake up another worker thread.
-  copy_operation_count_cv_.Signal();
-
-  {
-    base::AutoUnlock unlock(lock_);
-
-    gfx::GpuMemoryBuffer* gpu_memory_buffer = write_lock->GetGpuMemoryBuffer();
-    if (gpu_memory_buffer) {
-      TileTaskWorkerPool::PlaybackToMemory(
-          gpu_memory_buffer->Map(), src->format(), src->size(),
-          gpu_memory_buffer->GetStride(), raster_source, rect, scale);
-      gpu_memory_buffer->Unmap();
-    }
-  }
-
-  pending_copy_operations_.push_back(
-      make_scoped_ptr(new CopyOperation(write_lock.Pass(), src.Pass(), dst)));
-
-  // Acquire a sequence number for this copy operation.
-  CopySequenceNumber sequence = next_copy_operation_sequence_++;
-
-  // Post task that will advance last flushed copy operation to |sequence|
-  // if we have reached the flush period.
-  if ((sequence % kCopyFlushPeriod) == 0) {
-    task_runner_->PostTask(
-        FROM_HERE,
-        base::Bind(&OneCopyTileTaskWorkerPool::AdvanceLastFlushedCopyTo,
-                   weak_ptr_factory_.GetWeakPtr(), sequence));
-  }
-
-  return sequence;
-}
-
-void OneCopyTileTaskWorkerPool::AdvanceLastIssuedCopyTo(
-    CopySequenceNumber sequence) {
-  if (last_issued_copy_operation_ >= sequence)
-    return;
-
-  IssueCopyOperations(sequence - last_issued_copy_operation_);
-  last_issued_copy_operation_ = sequence;
-}
-
-void OneCopyTileTaskWorkerPool::AdvanceLastFlushedCopyTo(
-    CopySequenceNumber sequence) {
-  if (last_flushed_copy_operation_ >= sequence)
-    return;
-
-  AdvanceLastIssuedCopyTo(sequence);
-
-  // Flush all issued copy operations.
-  context_provider_->ContextGL()->ShallowFlushCHROMIUM();
-  last_flushed_copy_operation_ = last_issued_copy_operation_;
-}
-
-void OneCopyTileTaskWorkerPool::OnTaskSetFinished(TaskSet task_set) {
-  TRACE_EVENT1("cc", "OneCopyTileTaskWorkerPool::OnTaskSetFinished", "task_set",
-               task_set);
-
-  DCHECK(tasks_pending_[task_set]);
-  tasks_pending_[task_set] = false;
-  if (tasks_pending_.any()) {
-    TRACE_EVENT_ASYNC_STEP_INTO1("cc", "ScheduledTasks", this, "running",
-                                 "state", StateAsValue());
-  } else {
-    TRACE_EVENT_ASYNC_END0("cc", "ScheduledTasks", this);
-  }
-  client_->DidFinishRunningTileTasks(task_set);
-}
-
-void OneCopyTileTaskWorkerPool::IssueCopyOperations(int64 count) {
-  TRACE_EVENT1("cc", "OneCopyTileTaskWorkerPool::IssueCopyOperations", "count",
-               count);
-
-  CopyOperation::Deque copy_operations;
-
-  {
-    base::AutoLock lock(lock_);
-
-    for (int64 i = 0; i < count; ++i) {
-      DCHECK(!pending_copy_operations_.empty());
-      copy_operations.push_back(pending_copy_operations_.take_front());
-    }
-
-    // Decrement |scheduled_copy_operation_count_| and increment
-    // |issued_copy_operation_count_| to reflect the transition of copy
-    // operations from "pending" to "issued" state.
-    DCHECK_GE(scheduled_copy_operation_count_, copy_operations.size());
-    scheduled_copy_operation_count_ -= copy_operations.size();
-    issued_copy_operation_count_ += copy_operations.size();
-  }
-
-  while (!copy_operations.empty()) {
-    scoped_ptr<CopyOperation> copy_operation = copy_operations.take_front();
-
-    // Remove the write lock.
-    copy_operation->write_lock.reset();
-
-    // Copy contents of source resource to destination resource.
-    resource_provider_->CopyResource(copy_operation->src->id(),
-                                     copy_operation->dst->id());
-
-    // Return source resource to pool where it can be reused once copy
-    // operation has completed and resource is no longer busy.
-    resource_pool_->ReleaseResource(copy_operation->src.Pass());
-  }
-}
-
-void OneCopyTileTaskWorkerPool::
-    ScheduleCheckForCompletedCopyOperationsWithLockAcquired(
-        bool wait_if_needed) {
-  lock_.AssertAcquired();
-
-  if (check_for_completed_copy_operations_pending_)
-    return;
-
-  base::TimeTicks now = base::TimeTicks::Now();
-
-  // Schedule a check for completed copy operations as soon as possible but
-  // don't allow two consecutive checks to be scheduled to run less than the
-  // tick rate apart.
-  base::TimeTicks next_check_for_completed_copy_operations_time =
-      std::max(last_check_for_completed_copy_operations_time_ +
-                   base::TimeDelta::FromMilliseconds(
-                       kCheckForCompletedCopyOperationsTickRateMs),
-               now);
-
-  task_runner_->PostDelayedTask(
-      FROM_HERE,
-      base::Bind(&OneCopyTileTaskWorkerPool::CheckForCompletedCopyOperations,
-                 weak_ptr_factory_.GetWeakPtr(), wait_if_needed),
-      next_check_for_completed_copy_operations_time - now);
-
-  last_check_for_completed_copy_operations_time_ =
-      next_check_for_completed_copy_operations_time;
-  check_for_completed_copy_operations_pending_ = true;
-}
-
-void OneCopyTileTaskWorkerPool::CheckForCompletedCopyOperations(
-    bool wait_if_needed) {
-  TRACE_EVENT1("cc",
-               "OneCopyTileTaskWorkerPool::CheckForCompletedCopyOperations",
-               "wait_if_needed", wait_if_needed);
-
-  resource_pool_->CheckBusyResources(wait_if_needed);
-
-  {
-    base::AutoLock lock(lock_);
-
-    DCHECK(check_for_completed_copy_operations_pending_);
-    check_for_completed_copy_operations_pending_ = false;
-
-    // The number of busy resources in the pool reflects the number of issued
-    // copy operations that have not yet completed.
-    issued_copy_operation_count_ = resource_pool_->busy_resource_count();
-
-    // There may be work blocked on too many in-flight copy operations, so wake
-    // up a worker thread.
-    copy_operation_count_cv_.Signal();
-  }
-}
-
-scoped_refptr<base::trace_event::ConvertableToTraceFormat>
-OneCopyTileTaskWorkerPool::StateAsValue() const {
-  scoped_refptr<base::trace_event::TracedValue> state =
-      new base::trace_event::TracedValue();
-
-  state->BeginArray("tasks_pending");
-  for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; ++task_set)
-    state->AppendBoolean(tasks_pending_[task_set]);
-  state->EndArray();
-  state->BeginDictionary("staging_state");
-  StagingStateAsValueInto(state.get());
-  state->EndDictionary();
-
-  return state;
-}
-
-void OneCopyTileTaskWorkerPool::StagingStateAsValueInto(
-    base::trace_event::TracedValue* staging_state) const {
-  staging_state->SetInteger("staging_resource_count",
-                            resource_pool_->total_resource_count());
-  staging_state->SetInteger("bytes_used_for_staging_resources",
-                            resource_pool_->total_memory_usage_bytes());
-  staging_state->SetInteger("pending_copy_count",
-                            resource_pool_->total_resource_count() -
-                                resource_pool_->acquired_resource_count());
-  staging_state->SetInteger("bytes_pending_copy",
-                            resource_pool_->total_memory_usage_bytes() -
-                                resource_pool_->acquired_memory_usage_bytes());
-}
-
-}  // namespace cc