Remove parts of //cc we aren't using

cc/resources/tile_task_worker_pool.cc

-// Copyright 2013 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/tile_task_worker_pool.h"
-
-#include <algorithm>
-
-#include "base/trace_event/trace_event.h"
-#include "cc/resources/raster_source.h"
-#include "skia/ext/refptr.h"
-#include "third_party/skia/include/core/SkCanvas.h"
-#include "third_party/skia/include/core/SkSurface.h"
-
-namespace cc {
-namespace {
-
-class TaskSetFinishedTaskImpl : public TileTask {
- public:
-  explicit TaskSetFinishedTaskImpl(
-      base::SequencedTaskRunner* task_runner,
-      const base::Closure& on_task_set_finished_callback)
-      : task_runner_(task_runner),
-        on_task_set_finished_callback_(on_task_set_finished_callback) {}
-
-  // Overridden from Task:
-  void RunOnWorkerThread() override {
-    TRACE_EVENT0("cc", "TaskSetFinishedTaskImpl::RunOnWorkerThread");
-    TaskSetFinished();
-  }
-
-  // Overridden from TileTask:
-  void ScheduleOnOriginThread(TileTaskClient* client) override {}
-  void CompleteOnOriginThread(TileTaskClient* client) override {}
-  void RunReplyOnOriginThread() override {}
-
- protected:
-  ~TaskSetFinishedTaskImpl() override {}
-
-  void TaskSetFinished() {
-    task_runner_->PostTask(FROM_HERE, on_task_set_finished_callback_);
-  }
-
- private:
-  scoped_refptr<base::SequencedTaskRunner> task_runner_;
-  const base::Closure on_task_set_finished_callback_;
-
-  DISALLOW_COPY_AND_ASSIGN(TaskSetFinishedTaskImpl);
-};
-
-}  // namespace
-
-// This allows a micro benchmark system to run tasks with highest priority,
-// since it should finish as quickly as possible.
-unsigned TileTaskWorkerPool::kBenchmarkTaskPriority = 0u;
-// Task priorities that make sure task set finished tasks run before any
-// other remaining tasks. This is combined with the task set type to ensure
-// proper prioritization ordering between task set types.
-unsigned TileTaskWorkerPool::kTaskSetFinishedTaskPriorityBase = 1u;
-// For correctness, |kTileTaskPriorityBase| must be greater than
-// |kTaskSetFinishedTaskPriorityBase + kNumberOfTaskSets|.
-unsigned TileTaskWorkerPool::kTileTaskPriorityBase = 10u;
-
-TileTaskWorkerPool::TileTaskWorkerPool() {
-}
-
-TileTaskWorkerPool::~TileTaskWorkerPool() {
-}
-
-// static
-scoped_refptr<TileTask> TileTaskWorkerPool::CreateTaskSetFinishedTask(
-    base::SequencedTaskRunner* task_runner,
-    const base::Closure& on_task_set_finished_callback) {
-  return make_scoped_refptr(
-      new TaskSetFinishedTaskImpl(task_runner, on_task_set_finished_callback));
-}
-
-// static
-void TileTaskWorkerPool::ScheduleTasksOnOriginThread(TileTaskClient* client,
-                                                     TaskGraph* graph) {
-  TRACE_EVENT0("cc", "TileTaskWorkerPool::ScheduleTasksOnOriginThread");
-
-  for (TaskGraph::Node::Vector::iterator it = graph->nodes.begin();
-       it != graph->nodes.end(); ++it) {
-    TaskGraph::Node& node = *it;
-    TileTask* task = static_cast<TileTask*>(node.task);
-
-    if (!task->HasBeenScheduled()) {
-      task->WillSchedule();
-      task->ScheduleOnOriginThread(client);
-      task->DidSchedule();
-    }
-  }
-}
-
-// static
-void TileTaskWorkerPool::InsertNodeForTask(TaskGraph* graph,
-                                           TileTask* task,
-                                           unsigned priority,
-                                           size_t dependencies) {
-  DCHECK(std::find_if(graph->nodes.begin(), graph->nodes.end(),
-                      TaskGraph::Node::TaskComparator(task)) ==
-         graph->nodes.end());
-  graph->nodes.push_back(TaskGraph::Node(task, priority, dependencies));
-}
-
-// static
-void TileTaskWorkerPool::InsertNodesForRasterTask(
-    TaskGraph* graph,
-    RasterTask* raster_task,
-    const ImageDecodeTask::Vector& decode_tasks,
-    unsigned priority) {
-  size_t dependencies = 0u;
-
-  // Insert image decode tasks.
-  for (ImageDecodeTask::Vector::const_iterator it = decode_tasks.begin();
-       it != decode_tasks.end(); ++it) {
-    ImageDecodeTask* decode_task = it->get();
-
-    // Skip if already decoded.
-    if (decode_task->HasCompleted())
-      continue;
-
-    dependencies++;
-
-    // Add decode task if it doesn't already exists in graph.
-    TaskGraph::Node::Vector::iterator decode_it =
-        std::find_if(graph->nodes.begin(), graph->nodes.end(),
-                     TaskGraph::Node::TaskComparator(decode_task));
-    if (decode_it == graph->nodes.end())
-      InsertNodeForTask(graph, decode_task, priority, 0u);
-
-    graph->edges.push_back(TaskGraph::Edge(decode_task, raster_task));
-  }
-
-  InsertNodeForTask(graph, raster_task, priority, dependencies);
-}
-
-static bool IsSupportedPlaybackToMemoryFormat(ResourceFormat format) {
-  switch (format) {
-    case RGBA_4444:
-    case RGBA_8888:
-    case BGRA_8888:
-      return true;
-    case ALPHA_8:
-    case LUMINANCE_8:
-    case RGB_565:
-    case ETC1:
-    case RED_8:
-      return false;
-  }
-  NOTREACHED();
-  return false;
-}
-
-// static
-void TileTaskWorkerPool::PlaybackToMemory(void* memory,
-                                          ResourceFormat format,
-                                          const gfx::Size& size,
-                                          int stride,
-                                          const RasterSource* raster_source,
-                                          const gfx::Rect& rect,
-                                          float scale) {
-  DCHECK(IsSupportedPlaybackToMemoryFormat(format)) << format;
-
-  // Uses kPremul_SkAlphaType since the result is not known to be opaque.
-  SkImageInfo info =
-      SkImageInfo::MakeN32(size.width(), size.height(), kPremul_SkAlphaType);
-  SkColorType buffer_color_type = ResourceFormatToSkColorType(format);
-  bool needs_copy = buffer_color_type != info.colorType();
-
-  // Use unknown pixel geometry to disable LCD text.
-  SkSurfaceProps surface_props(0, kUnknown_SkPixelGeometry);
-  if (raster_source->CanUseLCDText()) {
-    // LegacyFontHost will get LCD text and skia figures out what type to use.
-    surface_props = SkSurfaceProps(SkSurfaceProps::kLegacyFontHost_InitType);
-  }
-
-  if (!stride)
-    stride = info.minRowBytes();
-
-  if (!needs_copy) {
-    skia::RefPtr<SkSurface> surface = skia::AdoptRef(
-        SkSurface::NewRasterDirect(info, memory, stride, &surface_props));
-    skia::RefPtr<SkCanvas> canvas = skia::SharePtr(surface->getCanvas());
-    raster_source->PlaybackToCanvas(canvas.get(), rect, scale);
-    return;
-  }
-
-  skia::RefPtr<SkSurface> surface =
-      skia::AdoptRef(SkSurface::NewRaster(info, &surface_props));
-  skia::RefPtr<SkCanvas> canvas = skia::SharePtr(surface->getCanvas());
-  raster_source->PlaybackToCanvas(canvas.get(), rect, scale);
-
-  SkImageInfo dst_info = info;
-  dst_info.fColorType = buffer_color_type;
-  // TODO(kaanb): The GL pipeline assumes a 4-byte alignment for the
-  // bitmap data. There will be no need to call SkAlign4 once crbug.com/293728
-  // is fixed.
-  const size_t dst_row_bytes = SkAlign4(dst_info.minRowBytes());
-  DCHECK_EQ(0u, dst_row_bytes % 4);
-  bool success = canvas->readPixels(dst_info, memory, dst_row_bytes, 0, 0);
-  DCHECK_EQ(true, success);
-}
-
-}  // namespace cc