src/cc/resources/raster_worker_pool.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/resources/raster_worker_pool.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/debug/trace_event.h"
  10 #include "base/lazy_instance.h"
  11 #include "base/strings/stringprintf.h"
  12 #include "base/threading/simple_thread.h"
  13 #include "cc/base/scoped_ptr_deque.h"
  14 #include "cc/resources/raster_source.h"
  15 #include "skia/ext/refptr.h"
  16 #include "third_party/skia/include/core/SkCanvas.h"
  17 #include "third_party/skia/include/core/SkSurface.h"
  18
  19 namespace cc {
  20 namespace {
  21
  22 class RasterTaskGraphRunner : public TaskGraphRunner,
  23                               public base::DelegateSimpleThread::Delegate {
  24  public:
  25   RasterTaskGraphRunner() {
  26     size_t num_threads = RasterWorkerPool::GetNumRasterThreads();
  27     while (workers_.size() < num_threads) {
  28       scoped_ptr<base::DelegateSimpleThread> worker =
  29           make_scoped_ptr(new base::DelegateSimpleThread(
  30               this,
  31               base::StringPrintf("CompositorRasterWorker%u",
  32                                  static_cast<unsigned>(workers_.size() + 1))
  33                   .c_str()));
  34       worker->Start();
  35 #if defined(OS_ANDROID) || defined(OS_LINUX)
  36       worker->SetThreadPriority(base::kThreadPriority_Background);
  37 #endif
  38       workers_.push_back(worker.Pass());
  39     }
  40   }
  41
  42   ~RasterTaskGraphRunner() override { NOTREACHED(); }
  43
  44  private:
  45   // Overridden from base::DelegateSimpleThread::Delegate:
  46   void Run() override { TaskGraphRunner::Run(); }
  47
  48   ScopedPtrDeque<base::DelegateSimpleThread> workers_;
  49 };
  50
  51 base::LazyInstance<RasterTaskGraphRunner>::Leaky g_task_graph_runner =
  52     LAZY_INSTANCE_INITIALIZER;
  53
  54 const int kDefaultNumRasterThreads = 1;
  55
  56 int g_num_raster_threads = 0;
  57
  58 class RasterFinishedTaskImpl : public RasterizerTask {
  59  public:
  60   explicit RasterFinishedTaskImpl(
  61       base::SequencedTaskRunner* task_runner,
  62       const base::Closure& on_raster_finished_callback)
  63       : task_runner_(task_runner),
  64         on_raster_finished_callback_(on_raster_finished_callback) {}
  65
  66   // Overridden from Task:
  67   void RunOnWorkerThread() override {
  68     TRACE_EVENT0("cc", "RasterFinishedTaskImpl::RunOnWorkerThread");
  69     RasterFinished();
  70   }
  71
  72   // Overridden from RasterizerTask:
  73   void ScheduleOnOriginThread(RasterizerTaskClient* client) override {}
  74   void CompleteOnOriginThread(RasterizerTaskClient* client) override {}
  75   void RunReplyOnOriginThread() override {}
  76
  77  protected:
  78   ~RasterFinishedTaskImpl() override {}
  79
  80   void RasterFinished() {
  81     task_runner_->PostTask(FROM_HERE, on_raster_finished_callback_);
  82   }
  83
  84  private:
  85   scoped_refptr<base::SequencedTaskRunner> task_runner_;
  86   const base::Closure on_raster_finished_callback_;
  87
  88   DISALLOW_COPY_AND_ASSIGN(RasterFinishedTaskImpl);
  89 };
  90
  91 }  // namespace
  92
  93 // This allows a micro benchmark system to run tasks with highest priority,
  94 // since it should finish as quickly as possible.
  95 unsigned RasterWorkerPool::kBenchmarkRasterTaskPriority = 0u;
  96 // Task priorities that make sure raster finished tasks run before any
  97 // remaining raster tasks.
  98 unsigned RasterWorkerPool::kRasterFinishedTaskPriority = 1u;
  99 unsigned RasterWorkerPool::kRasterTaskPriorityBase = 2u;
 100
 101 RasterWorkerPool::RasterWorkerPool() {}
 102
 103 RasterWorkerPool::~RasterWorkerPool() {}
 104
 105 // static
 106 void RasterWorkerPool::SetNumRasterThreads(int num_threads) {
 107   DCHECK_LT(0, num_threads);
 108   DCHECK_EQ(0, g_num_raster_threads);
 109
 110   g_num_raster_threads = num_threads;
 111 }
 112
 113 // static
 114 int RasterWorkerPool::GetNumRasterThreads() {
 115   if (!g_num_raster_threads)
 116     g_num_raster_threads = kDefaultNumRasterThreads;
 117
 118   return g_num_raster_threads;
 119 }
 120
 121 // static
 122 TaskGraphRunner* RasterWorkerPool::GetTaskGraphRunner() {
 123   return g_task_graph_runner.Pointer();
 124 }
 125
 126 // static
 127 scoped_refptr<RasterizerTask> RasterWorkerPool::CreateRasterFinishedTask(
 128     base::SequencedTaskRunner* task_runner,
 129     const base::Closure& on_raster_finished_callback) {
 130   return make_scoped_refptr(
 131       new RasterFinishedTaskImpl(task_runner, on_raster_finished_callback));
 132 }
 133
 134 // static
 135 void RasterWorkerPool::ScheduleTasksOnOriginThread(RasterizerTaskClient* client,
 136                                                    TaskGraph* graph) {
 137   TRACE_EVENT0("cc", "Rasterizer::ScheduleTasksOnOriginThread");
 138
 139   for (TaskGraph::Node::Vector::iterator it = graph->nodes.begin();
 140        it != graph->nodes.end();
 141        ++it) {
 142     TaskGraph::Node& node = *it;
 143     RasterizerTask* task = static_cast<RasterizerTask*>(node.task);
 144
 145     if (!task->HasBeenScheduled()) {
 146       task->WillSchedule();
 147       task->ScheduleOnOriginThread(client);
 148       task->DidSchedule();
 149     }
 150   }
 151 }
 152
 153 // static
 154 void RasterWorkerPool::InsertNodeForTask(TaskGraph* graph,
 155                                          RasterizerTask* task,
 156                                          unsigned priority,
 157                                          size_t dependencies) {
 158   DCHECK(std::find_if(graph->nodes.begin(),
 159                       graph->nodes.end(),
 160                       TaskGraph::Node::TaskComparator(task)) ==
 161          graph->nodes.end());
 162   graph->nodes.push_back(TaskGraph::Node(task, priority, dependencies));
 163 }
 164
 165 // static
 166 void RasterWorkerPool::InsertNodesForRasterTask(
 167     TaskGraph* graph,
 168     RasterTask* raster_task,
 169     const ImageDecodeTask::Vector& decode_tasks,
 170     unsigned priority) {
 171   size_t dependencies = 0u;
 172
 173   // Insert image decode tasks.
 174   for (ImageDecodeTask::Vector::const_iterator it = decode_tasks.begin();
 175        it != decode_tasks.end();
 176        ++it) {
 177     ImageDecodeTask* decode_task = it->get();
 178
 179     // Skip if already decoded.
 180     if (decode_task->HasCompleted())
 181       continue;
 182
 183     dependencies++;
 184
 185     // Add decode task if it doesn't already exists in graph.
 186     TaskGraph::Node::Vector::iterator decode_it =
 187         std::find_if(graph->nodes.begin(),
 188                      graph->nodes.end(),
 189                      TaskGraph::Node::TaskComparator(decode_task));
 190     if (decode_it == graph->nodes.end())
 191       InsertNodeForTask(graph, decode_task, priority, 0u);
 192
 193     graph->edges.push_back(TaskGraph::Edge(decode_task, raster_task));
 194   }
 195
 196   InsertNodeForTask(graph, raster_task, priority, dependencies);
 197 }
 198
 199 static bool IsSupportedPlaybackToMemoryFormat(ResourceFormat format) {
 200   switch (format) {
 201     case RGBA_4444:
 202     case RGBA_8888:
 203     case BGRA_8888:
 204       return true;
 205     case ALPHA_8:
 206     case LUMINANCE_8:
 207     case RGB_565:
 208     case ETC1:
 209       return false;
 210   }
 211   NOTREACHED();
 212   return false;
 213 }
 214
 215 // static
 216 void RasterWorkerPool::PlaybackToMemory(void* memory,
 217                                         ResourceFormat format,
 218                                         const gfx::Size& size,
 219                                         int stride,
 220                                         const RasterSource* raster_source,
 221                                         const gfx::Rect& rect,
 222                                         float scale) {
 223   DCHECK(IsSupportedPlaybackToMemoryFormat(format)) << format;
 224
 225   // Uses kPremul_SkAlphaType since the result is not known to be opaque.
 226   SkImageInfo info =
 227       SkImageInfo::MakeN32(size.width(), size.height(), kPremul_SkAlphaType);
 228   SkColorType buffer_color_type = ResourceFormatToSkColorType(format);
 229   bool needs_copy = buffer_color_type != info.colorType();
 230
 231   // TODO(danakj): Make a SkSurfaceProps with an SkPixelGeometry to enable or
 232   // disable LCD text.
 233   // TODO(danakj): Disable LCD text on Mac during layout tests:
 234   // https://cs.chromium.org#chromium/src/third_party/WebKit/Source/platform/fonts/mac/FontPlatformDataMac.mm&l=55
 235   // TODO(danakj): On Windows when LCD text is disabled, ask skia to draw LCD
 236   // text offscreen and downsample it to AA text.
 237   // https://cs.chromium.org#chromium/src/third_party/WebKit/Source/platform/fonts/win/FontPlatformDataWin.cpp&l=86
 238   SkSurfaceProps* surface_props = nullptr;
 239
 240   if (!stride)
 241     stride = info.minRowBytes();
 242
 243   if (!needs_copy) {
 244     skia::RefPtr<SkSurface> surface = skia::AdoptRef(
 245         SkSurface::NewRasterDirect(info, memory, stride, surface_props));
 246     skia::RefPtr<SkCanvas> canvas = skia::SharePtr(surface->getCanvas());
 247     raster_source->PlaybackToCanvas(canvas.get(), rect, scale);
 248     return;
 249   }
 250
 251   skia::RefPtr<SkSurface> surface =
 252       skia::AdoptRef(SkSurface::NewRaster(info, surface_props));
 253   skia::RefPtr<SkCanvas> canvas = skia::SharePtr(surface->getCanvas());
 254   raster_source->PlaybackToCanvas(canvas.get(), rect, scale);
 255
 256   SkImageInfo dst_info = info;
 257   dst_info.fColorType = buffer_color_type;
 258   // TODO(kaanb): The GL pipeline assumes a 4-byte alignment for the
 259   // bitmap data. There will be no need to call SkAlign4 once crbug.com/293728
 260   // is fixed.
 261   const size_t dst_row_bytes = SkAlign4(dst_info.minRowBytes());
 262   DCHECK_EQ(0u, dst_row_bytes % 4);
 263   bool success = canvas->readPixels(dst_info, memory, dst_row_bytes, 0, 0);
 264   DCHECK_EQ(true, success);
 265 }
 266
 267 }  // namespace cc