cc: Add initial GPU-to-GPU copy rasterizer implementation.

cc/resources/image_copy_raster_worker_pool.cc

Index: cc/resources/image_copy_raster_worker_pool.cc
diff --git a/cc/resources/image_copy_raster_worker_pool.cc b/cc/resources/image_copy_raster_worker_pool.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0d4f7441e5222be3b78646df74e05dd6e98dbbae
--- /dev/null
+++ b/cc/resources/image_copy_raster_worker_pool.cc
@@ -0,0 +1,260 @@
+// 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/image_copy_raster_worker_pool.h"
+
+#include <algorithm>
+
+#include "base/debug/trace_event.h"
+#include "cc/debug/traced_value.h"
+#include "cc/resources/resource_pool.h"
+#include "cc/resources/scoped_resource.h"
+
+namespace cc {
+
+// static
+scoped_ptr<RasterWorkerPool> ImageCopyRasterWorkerPool::Create(
+    base::SequencedTaskRunner* task_runner,
+    TaskGraphRunner* task_graph_runner,
+    ResourceProvider* resource_provider,
+    ResourcePool* resource_pool) {
+  return make_scoped_ptr<RasterWorkerPool>(new ImageCopyRasterWorkerPool(
+      task_runner, task_graph_runner, resource_provider, resource_pool));
+}
+
+ImageCopyRasterWorkerPool::ImageCopyRasterWorkerPool(
+    base::SequencedTaskRunner* task_runner,
+    TaskGraphRunner* task_graph_runner,
+    ResourceProvider* resource_provider,
+    ResourcePool* resource_pool)
+    : task_runner_(task_runner),
+      task_graph_runner_(task_graph_runner),
+      namespace_token_(task_graph_runner->GetNamespaceToken()),
+      resource_provider_(resource_provider),
+      resource_pool_(resource_pool),
+      has_performed_copy_since_last_flush_(false),
+      raster_tasks_pending_(false),
+      raster_tasks_required_for_activation_pending_(false),
+      raster_finished_weak_ptr_factory_(this) {}
+
+ImageCopyRasterWorkerPool::~ImageCopyRasterWorkerPool() {
+  DCHECK_EQ(0u, raster_task_states_.size());
+}
+
+Rasterizer* ImageCopyRasterWorkerPool::AsRasterizer() { return this; }
+
+void ImageCopyRasterWorkerPool::SetClient(RasterizerClient* client) {
+  client_ = client;
+}
+
+void ImageCopyRasterWorkerPool::Shutdown() {
+  TRACE_EVENT0("cc", "ImageCopyRasterWorkerPool::Shutdown");
+
+  TaskGraph empty;
+  task_graph_runner_->ScheduleTasks(namespace_token_, &empty);
+  task_graph_runner_->WaitForTasksToFinishRunning(namespace_token_);
+}
+
+void ImageCopyRasterWorkerPool::ScheduleTasks(RasterTaskQueue* queue) {
+  TRACE_EVENT0("cc", "ImageCopyRasterWorkerPool::ScheduleTasks");
+
+  DCHECK_EQ(queue->required_for_activation_count,
+            static_cast<size_t>(
+                std::count_if(queue->items.begin(),
+                              queue->items.end(),
+                              RasterTaskQueue::Item::IsRequiredForActivation)));
+
+  if (!raster_tasks_pending_)
+    TRACE_EVENT_ASYNC_BEGIN0("cc", "ScheduledTasks", this);
+
+  raster_tasks_pending_ = true;
+  raster_tasks_required_for_activation_pending_ = true;
+
+  unsigned priority = kRasterTaskPriorityBase;
+
+  graph_.Reset();
+
+  // Cancel existing OnRasterFinished callbacks.
+  raster_finished_weak_ptr_factory_.InvalidateWeakPtrs();
+
+  scoped_refptr<RasterizerTask>
+      new_raster_required_for_activation_finished_task(
+          CreateRasterRequiredForActivationFinishedTask(
+              queue->required_for_activation_count,
+              task_runner_.get(),
+              base::Bind(&ImageCopyRasterWorkerPool::
+                             OnRasterRequiredForActivationFinished,
+                         raster_finished_weak_ptr_factory_.GetWeakPtr())));
+  scoped_refptr<RasterizerTask> new_raster_finished_task(
+      CreateRasterFinishedTask(
+          task_runner_.get(),
+          base::Bind(&ImageCopyRasterWorkerPool::OnRasterFinished,
+                     raster_finished_weak_ptr_factory_.GetWeakPtr())));
+
+  resource_pool_->CheckBusyResources();
+
+  for (RasterTaskQueue::Item::Vector::const_iterator it = queue->items.begin();
+       it != queue->items.end();
+       ++it) {
+    const RasterTaskQueue::Item& item = *it;
+    RasterTask* task = item.task;
+    DCHECK(!task->HasCompleted());
+
+    if (item.required_for_activation) {
+      graph_.edges.push_back(TaskGraph::Edge(
+          task, new_raster_required_for_activation_finished_task.get()));
+    }
+
+    InsertNodesForRasterTask(&graph_, task, task->dependencies(), priority++);
+
+    graph_.edges.push_back(
+        TaskGraph::Edge(task, new_raster_finished_task.get()));
+  }
+
+  InsertNodeForTask(&graph_,
+                    new_raster_required_for_activation_finished_task.get(),
+                    kRasterRequiredForActivationFinishedTaskPriority,
+                    queue->required_for_activation_count);
+  InsertNodeForTask(&graph_,
+                    new_raster_finished_task.get(),
+                    kRasterFinishedTaskPriority,
+                    queue->items.size());
+
+  ScheduleTasksOnOriginThread(this, &graph_);
+  task_graph_runner_->ScheduleTasks(namespace_token_, &graph_);
+
+  raster_finished_task_ = new_raster_finished_task;
+  raster_required_for_activation_finished_task_ =
+      new_raster_required_for_activation_finished_task;
+
+  resource_pool_->ReduceResourceUsage();
+
+  TRACE_EVENT_ASYNC_STEP_INTO1(
+      "cc",
+      "ScheduledTasks",
+      this,
+      "rasterizing",
+      "state",
+      TracedValue::FromValue(StateAsValue().release()));
+}
+
+void ImageCopyRasterWorkerPool::CheckForCompletedTasks() {
+  TRACE_EVENT0("cc", "ImageCopyRasterWorkerPool::CheckForCompletedTasks");
+
+  task_graph_runner_->CollectCompletedTasks(namespace_token_,
+                                            &completed_tasks_);
+  for (Task::Vector::const_iterator it = completed_tasks_.begin();
+       it != completed_tasks_.end();
+       ++it) {
+    RasterizerTask* task = static_cast<RasterizerTask*>(it->get());
+
+    task->WillComplete();
+    task->CompleteOnOriginThread(this);
+    task->DidComplete();
+
+    task->RunReplyOnOriginThread();
+  }
+  completed_tasks_.clear();
+
+  FlushCopies();
+}
+
+SkCanvas* ImageCopyRasterWorkerPool::AcquireCanvasForRaster(RasterTask* task) {
+  DCHECK_EQ(task->resource()->format(), resource_pool_->resource_format());
+  scoped_ptr<ScopedResource> resource(
+      resource_pool_->AcquireResource(task->resource()->size()));
+  SkCanvas* canvas = resource_provider_->MapImageRasterBuffer(resource->id());
+  DCHECK(std::find_if(raster_task_states_.begin(),
+                      raster_task_states_.end(),
+                      RasterTaskState::TaskComparator(task)) ==
+         raster_task_states_.end());
+  raster_task_states_.push_back(RasterTaskState(task, resource.release()));
+  return canvas;
+}
+
+void ImageCopyRasterWorkerPool::ReleaseCanvasForRaster(RasterTask* task) {
+  RasterTaskState::Vector::iterator it =
+      std::find_if(raster_task_states_.begin(),
+                   raster_task_states_.end(),
+                   RasterTaskState::TaskComparator(task));
+  DCHECK(it != raster_task_states_.end());
+  scoped_ptr<ScopedResource> resource(it->resource);
+  std::swap(*it, raster_task_states_.back());
+  raster_task_states_.pop_back();
+
+  bool content_has_changed =
+      resource_provider_->UnmapImageRasterBuffer(resource->id());
+
+  // |content_has_changed| can be false as result of task being canceled or
+  // task implementation deciding not to modify bitmap (ie. analysis of raster
+  // commands detected content as a solid color).
+  if (content_has_changed) {
+    resource_provider_->CopyResource(resource->id(), task->resource()->id());
+    has_performed_copy_since_last_flush_ = true;
+  }
+
+  resource_pool_->ReleaseResource(resource.Pass());
+}
+
+void ImageCopyRasterWorkerPool::OnRasterFinished() {
+  TRACE_EVENT0("cc", "ImageCopyRasterWorkerPool::OnRasterFinished");
+
+  DCHECK(raster_tasks_pending_);
+  raster_tasks_pending_ = false;
+  TRACE_EVENT_ASYNC_END0("cc", "ScheduledTasks", this);
+  client_->DidFinishRunningTasks();
+}
+
+void ImageCopyRasterWorkerPool::OnRasterRequiredForActivationFinished() {
+  TRACE_EVENT0(
+      "cc", "ImageCopyRasterWorkerPool::OnRasterRequiredForActivationFinished");
+
+  DCHECK(raster_tasks_required_for_activation_pending_);
+  raster_tasks_required_for_activation_pending_ = false;
+  TRACE_EVENT_ASYNC_STEP_INTO1(
+      "cc",
+      "ScheduledTasks",
+      this,
+      "rasterizing",
+      "state",
+      TracedValue::FromValue(StateAsValue().release()));
+  client_->DidFinishRunningTasksRequiredForActivation();
+}
+
+void ImageCopyRasterWorkerPool::FlushCopies() {
+  if (!has_performed_copy_since_last_flush_)
+    return;
+
+  resource_provider_->ShallowFlushIfSupported();
+  has_performed_copy_since_last_flush_ = false;
+}
+
+scoped_ptr<base::Value> ImageCopyRasterWorkerPool::StateAsValue() const {
+  scoped_ptr<base::DictionaryValue> state(new base::DictionaryValue);
+
+  state->SetInteger("pending_count", raster_task_states_.size());
+  state->SetBoolean("tasks_required_for_activation_pending",
+                    raster_tasks_required_for_activation_pending_);
+  state->Set("staging_state", StagingStateAsValue().release());
+
+  return state.PassAs<base::Value>();
+}
+scoped_ptr<base::Value> ImageCopyRasterWorkerPool::StagingStateAsValue() const {
+  scoped_ptr<base::DictionaryValue> staging_state(new base::DictionaryValue);
+
+  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());
+
+  return staging_state.PassAs<base::Value>();
+}
+
+}  // namespace cc