content/browser/compositor/delegated_frame_host.cc

   1 // Copyright 2014 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 "content/browser/compositor/delegated_frame_host.h"
   6
   7 #include "base/callback_helpers.h"
   8 #include "base/command_line.h"
   9 #include "cc/output/compositor_frame.h"
  10 #include "cc/output/compositor_frame_ack.h"
  11 #include "cc/output/copy_output_request.h"
  12 #include "cc/resources/single_release_callback.h"
  13 #include "cc/resources/texture_mailbox.h"
  14 #include "cc/surfaces/surface_factory.h"
  15 #include "content/browser/compositor/resize_lock.h"
  16 #include "content/common/gpu/client/gl_helper.h"
  17 #include "content/public/browser/render_widget_host_view_frame_subscriber.h"
  18 #include "content/public/common/content_switches.h"
  19 #include "media/base/video_frame.h"
  20 #include "media/base/video_util.h"
  21 #include "skia/ext/image_operations.h"
  22 #include "ui/gfx/frame_time.h"
  23
  24 namespace content {
  25
  26 ////////////////////////////////////////////////////////////////////////////////
  27 // DelegatedFrameHostClient
  28
  29 bool DelegatedFrameHostClient::ShouldCreateResizeLock() {
  30   // On Windows and Linux, holding pointer moves will not help throttling
  31   // resizes.
  32   // TODO(piman): on Windows we need to block (nested message loop?) the
  33   // WM_SIZE event. On Linux we need to throttle at the WM level using
  34   // _NET_WM_SYNC_REQUEST.
  35   // TODO(ccameron): Mac browser window resizing is incompletely implemented.
  36 #if !defined(OS_CHROMEOS)
  37   return false;
  38 #else
  39   return GetDelegatedFrameHost()->ShouldCreateResizeLock();
  40 #endif
  41 }
  42
  43 void DelegatedFrameHostClient::RequestCopyOfOutput(
  44     scoped_ptr<cc::CopyOutputRequest> request) {
  45   GetDelegatedFrameHost()->RequestCopyOfOutput(request.Pass());
  46 }
  47
  48 ////////////////////////////////////////////////////////////////////////////////
  49 // DelegatedFrameHost
  50
  51 DelegatedFrameHost::DelegatedFrameHost(DelegatedFrameHostClient* client)
  52     : client_(client),
  53       use_surfaces_(base::CommandLine::ForCurrentProcess()->HasSwitch(
  54           switches::kUseSurfaces)),
  55       last_output_surface_id_(0),
  56       pending_delegated_ack_count_(0),
  57       skipped_frames_(false),
  58       can_lock_compositor_(YES_CAN_LOCK),
  59       delegated_frame_evictor_(new DelegatedFrameEvictor(this)) {
  60   ImageTransportFactory::GetInstance()->AddObserver(this);
  61 }
  62
  63 void DelegatedFrameHost::WasShown(const ui::LatencyInfo& latency_info) {
  64   delegated_frame_evictor_->SetVisible(true);
  65
  66   if (surface_id_.is_null() && !frame_provider_ &&
  67       !released_front_lock_.get()) {
  68     ui::Compositor* compositor = client_->GetCompositor();
  69     if (compositor)
  70       released_front_lock_ = compositor->GetCompositorLock();
  71   }
  72
  73   ui::Compositor* compositor = client_->GetCompositor();
  74   if (compositor) {
  75     compositor->SetLatencyInfo(latency_info);
  76   }
  77 }
  78
  79 bool DelegatedFrameHost::HasSavedFrame() {
  80   return delegated_frame_evictor_->HasFrame();
  81 }
  82
  83 void DelegatedFrameHost::WasHidden() {
  84   delegated_frame_evictor_->SetVisible(false);
  85   released_front_lock_ = NULL;
  86 }
  87
  88 void DelegatedFrameHost::MaybeCreateResizeLock() {
  89   if (!client_->ShouldCreateResizeLock())
  90     return;
  91   DCHECK(client_->GetCompositor());
  92
  93   // Listen to changes in the compositor lock state.
  94   ui::Compositor* compositor = client_->GetCompositor();
  95   if (!compositor->HasObserver(this))
  96     compositor->AddObserver(this);
  97
  98   bool defer_compositor_lock =
  99       can_lock_compositor_ == NO_PENDING_RENDERER_FRAME ||
 100       can_lock_compositor_ == NO_PENDING_COMMIT;
 101
 102   if (can_lock_compositor_ == YES_CAN_LOCK)
 103     can_lock_compositor_ = YES_DID_LOCK;
 104
 105   resize_lock_ = client_->CreateResizeLock(defer_compositor_lock);
 106 }
 107
 108 bool DelegatedFrameHost::ShouldCreateResizeLock() {
 109   RenderWidgetHostImpl* host = client_->GetHost();
 110
 111   if (resize_lock_)
 112     return false;
 113
 114   if (host->should_auto_resize())
 115     return false;
 116
 117   gfx::Size desired_size = client_->DesiredFrameSize();
 118   if (desired_size == current_frame_size_in_dip_ || desired_size.IsEmpty())
 119     return false;
 120
 121   ui::Compositor* compositor = client_->GetCompositor();
 122   if (!compositor)
 123     return false;
 124
 125   return true;
 126 }
 127
 128 void DelegatedFrameHost::RequestCopyOfOutput(
 129     scoped_ptr<cc::CopyOutputRequest> request) {
 130   client_->GetLayer()->RequestCopyOfOutput(request.Pass());
 131 }
 132
 133 void DelegatedFrameHost::CopyFromCompositingSurface(
 134     const gfx::Rect& src_subrect,
 135     const gfx::Size& output_size,
 136     const base::Callback<void(bool, const SkBitmap&)>& callback,
 137     const SkColorType color_type) {
 138   // Only ARGB888 and RGB565 supported as of now.
 139   bool format_support = ((color_type == kRGB_565_SkColorType) ||
 140                          (color_type == kN32_SkColorType));
 141   DCHECK(format_support);
 142   if (!CanCopyToBitmap()) {
 143     callback.Run(false, SkBitmap());
 144     return;
 145   }
 146
 147   scoped_ptr<cc::CopyOutputRequest> request =
 148       cc::CopyOutputRequest::CreateRequest(base::Bind(
 149           &DelegatedFrameHost::CopyFromCompositingSurfaceHasResult,
 150           output_size,
 151           color_type,
 152           callback));
 153   request->set_area(src_subrect);
 154   client_->RequestCopyOfOutput(request.Pass());
 155 }
 156
 157 void DelegatedFrameHost::CopyFromCompositingSurfaceToVideoFrame(
 158       const gfx::Rect& src_subrect,
 159       const scoped_refptr<media::VideoFrame>& target,
 160       const base::Callback<void(bool)>& callback) {
 161   if (!CanCopyToVideoFrame()) {
 162     callback.Run(false);
 163     return;
 164   }
 165
 166   // Try get a texture to reuse.
 167   scoped_refptr<OwnedMailbox> subscriber_texture;
 168   if (frame_subscriber_) {
 169     if (!idle_frame_subscriber_textures_.empty()) {
 170       subscriber_texture = idle_frame_subscriber_textures_.back();
 171       idle_frame_subscriber_textures_.pop_back();
 172     } else if (GLHelper* helper =
 173                    ImageTransportFactory::GetInstance()->GetGLHelper()) {
 174       subscriber_texture = new OwnedMailbox(helper);
 175     }
 176   }
 177
 178   scoped_ptr<cc::CopyOutputRequest> request =
 179       cc::CopyOutputRequest::CreateRequest(base::Bind(
 180           &DelegatedFrameHost::
 181                CopyFromCompositingSurfaceHasResultForVideo,
 182           AsWeakPtr(),  // For caching the ReadbackYUVInterface on this class.
 183           subscriber_texture,
 184           target,
 185           callback));
 186   request->set_area(src_subrect);
 187   if (subscriber_texture.get()) {
 188     request->SetTextureMailbox(
 189         cc::TextureMailbox(subscriber_texture->mailbox(),
 190                            subscriber_texture->target(),
 191                            subscriber_texture->sync_point()));
 192   }
 193   client_->RequestCopyOfOutput(request.Pass());
 194 }
 195
 196 bool DelegatedFrameHost::CanCopyToBitmap() const {
 197   return client_->GetCompositor() &&
 198          client_->GetLayer()->has_external_content();
 199 }
 200
 201 bool DelegatedFrameHost::CanCopyToVideoFrame() const {
 202   return client_->GetCompositor() &&
 203          client_->GetLayer()->has_external_content();
 204 }
 205
 206 bool DelegatedFrameHost::CanSubscribeFrame() const {
 207   return true;
 208 }
 209
 210 void DelegatedFrameHost::BeginFrameSubscription(
 211     scoped_ptr<RenderWidgetHostViewFrameSubscriber> subscriber) {
 212   frame_subscriber_ = subscriber.Pass();
 213 }
 214
 215 void DelegatedFrameHost::EndFrameSubscription() {
 216   idle_frame_subscriber_textures_.clear();
 217   frame_subscriber_.reset();
 218 }
 219
 220 bool DelegatedFrameHost::ShouldSkipFrame(gfx::Size size_in_dip) const {
 221   // Should skip a frame only when another frame from the renderer is guaranteed
 222   // to replace it. Otherwise may cause hangs when the renderer is waiting for
 223   // the completion of latency infos (such as when taking a Snapshot.)
 224   if (can_lock_compositor_ == NO_PENDING_RENDERER_FRAME ||
 225       can_lock_compositor_ == NO_PENDING_COMMIT ||
 226       !resize_lock_.get())
 227     return false;
 228
 229   return size_in_dip != resize_lock_->expected_size();
 230 }
 231
 232 void DelegatedFrameHost::WasResized() {
 233   if (client_->DesiredFrameSize() != current_frame_size_in_dip_ &&
 234       client_->GetHost()->is_hidden())
 235     EvictDelegatedFrame();
 236   MaybeCreateResizeLock();
 237 }
 238
 239 gfx::Size DelegatedFrameHost::GetRequestedRendererSize() const {
 240   if (resize_lock_)
 241     return resize_lock_->expected_size();
 242   else
 243     return client_->DesiredFrameSize();
 244 }
 245
 246 void DelegatedFrameHost::CheckResizeLock() {
 247   if (!resize_lock_ ||
 248       resize_lock_->expected_size() != current_frame_size_in_dip_)
 249     return;
 250
 251   // Since we got the size we were looking for, unlock the compositor. But delay
 252   // the release of the lock until we've kicked a frame with the new texture, to
 253   // avoid resizing the UI before we have a chance to draw a "good" frame.
 254   resize_lock_->UnlockCompositor();
 255   ui::Compositor* compositor = client_->GetCompositor();
 256   if (compositor) {
 257     if (!compositor->HasObserver(this))
 258       compositor->AddObserver(this);
 259   }
 260 }
 261
 262 void DelegatedFrameHost::DidReceiveFrameFromRenderer(
 263     const gfx::Rect& damage_rect) {
 264   if (!frame_subscriber() || !CanCopyToVideoFrame())
 265     return;
 266
 267   const base::TimeTicks now = gfx::FrameTime::Now();
 268   base::TimeTicks present_time;
 269   if (vsync_timebase_.is_null() || vsync_interval_ <= base::TimeDelta()) {
 270     present_time = now;
 271   } else {
 272     const int64 intervals_elapsed = (now - vsync_timebase_) / vsync_interval_;
 273     present_time = vsync_timebase_ + (intervals_elapsed + 1) * vsync_interval_;
 274   }
 275
 276   scoped_refptr<media::VideoFrame> frame;
 277   RenderWidgetHostViewFrameSubscriber::DeliverFrameCallback callback;
 278   if (frame_subscriber()->ShouldCaptureFrame(damage_rect, present_time,
 279                                              &frame, &callback)) {
 280     CopyFromCompositingSurfaceToVideoFrame(
 281         gfx::Rect(current_frame_size_in_dip_),
 282         frame,
 283         base::Bind(callback, present_time));
 284   }
 285 }
 286
 287 void DelegatedFrameHost::SwapDelegatedFrame(
 288     uint32 output_surface_id,
 289     scoped_ptr<cc::DelegatedFrameData> frame_data,
 290     float frame_device_scale_factor,
 291     const std::vector<ui::LatencyInfo>& latency_info) {
 292   RenderWidgetHostImpl* host = client_->GetHost();
 293   DCHECK(!frame_data->render_pass_list.empty());
 294
 295   cc::RenderPass* root_pass = frame_data->render_pass_list.back();
 296
 297   gfx::Size frame_size = root_pass->output_rect.size();
 298   gfx::Size frame_size_in_dip =
 299       ConvertSizeToDIP(frame_device_scale_factor, frame_size);
 300
 301   gfx::Rect damage_rect = gfx::ToEnclosingRect(root_pass->damage_rect);
 302   damage_rect.Intersect(gfx::Rect(frame_size));
 303   gfx::Rect damage_rect_in_dip =
 304       ConvertRectToDIP(frame_device_scale_factor, damage_rect);
 305
 306   if (ShouldSkipFrame(frame_size_in_dip)) {
 307     cc::CompositorFrameAck ack;
 308     cc::TransferableResource::ReturnResources(frame_data->resource_list,
 309                                               &ack.resources);
 310
 311     skipped_latency_info_list_.insert(skipped_latency_info_list_.end(),
 312         latency_info.begin(), latency_info.end());
 313
 314     RenderWidgetHostImpl::SendSwapCompositorFrameAck(
 315         host->GetRoutingID(), output_surface_id,
 316         host->GetProcess()->GetID(), ack);
 317     skipped_frames_ = true;
 318     return;
 319   }
 320
 321   if (skipped_frames_) {
 322     skipped_frames_ = false;
 323     damage_rect = gfx::Rect(frame_size);
 324     damage_rect_in_dip = gfx::Rect(frame_size_in_dip);
 325
 326     // Give the same damage rect to the compositor.
 327     cc::RenderPass* root_pass = frame_data->render_pass_list.back();
 328     root_pass->damage_rect = damage_rect;
 329   }
 330
 331   if (output_surface_id != last_output_surface_id_) {
 332     // Resource ids are scoped by the output surface.
 333     // If the originating output surface doesn't match the last one, it
 334     // indicates the renderer's output surface may have been recreated, in which
 335     // case we should recreate the DelegatedRendererLayer, to avoid matching
 336     // resources from the old one with resources from the new one which would
 337     // have the same id. Changing the layer to showing painted content destroys
 338     // the DelegatedRendererLayer.
 339     EvictDelegatedFrame();
 340
 341     // Drop the cc::DelegatedFrameResourceCollection so that we will not return
 342     // any resources from the old output surface with the new output surface id.
 343     if (resource_collection_.get()) {
 344       resource_collection_->SetClient(NULL);
 345
 346       if (resource_collection_->LoseAllResources())
 347         SendReturnedDelegatedResources(last_output_surface_id_);
 348
 349       resource_collection_ = NULL;
 350     }
 351     last_output_surface_id_ = output_surface_id;
 352   }
 353   bool modified_layers = false;
 354   if (frame_size.IsEmpty()) {
 355     DCHECK(frame_data->resource_list.empty());
 356     EvictDelegatedFrame();
 357     modified_layers = true;
 358   } else {
 359     if (use_surfaces_) {
 360       if (!surface_factory_) {
 361         ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
 362         cc::SurfaceManager* manager = factory->GetSurfaceManager();
 363         id_allocator_ = factory->CreateSurfaceIdAllocator();
 364         surface_factory_ =
 365             make_scoped_ptr(new cc::SurfaceFactory(manager, this));
 366       }
 367       if (surface_id_.is_null() || frame_size != current_surface_size_ ||
 368           frame_size_in_dip != current_frame_size_in_dip_) {
 369         // TODO(jbauman): Wait to destroy this surface until the parent has
 370         // finished using it.
 371         if (!surface_id_.is_null())
 372           surface_factory_->Destroy(surface_id_);
 373         surface_id_ = id_allocator_->GenerateId();
 374         surface_factory_->Create(surface_id_, frame_size);
 375         client_->GetLayer()->SetShowSurface(surface_id_, frame_size_in_dip);
 376         current_surface_size_ = frame_size;
 377         modified_layers = true;
 378       }
 379       scoped_ptr<cc::CompositorFrame> compositor_frame =
 380           make_scoped_ptr(new cc::CompositorFrame());
 381       compositor_frame->delegated_frame_data = frame_data.Pass();
 382       surface_factory_->SubmitFrame(surface_id_, compositor_frame.Pass());
 383     } else {
 384       if (!resource_collection_) {
 385         resource_collection_ = new cc::DelegatedFrameResourceCollection;
 386         resource_collection_->SetClient(this);
 387       }
 388       // If the physical frame size changes, we need a new |frame_provider_|. If
 389       // the physical frame size is the same, but the size in DIP changed, we
 390       // need to adjust the scale at which the frames will be drawn, and we do
 391       // this by making a new |frame_provider_| also to ensure the scale change
 392       // is presented in sync with the new frame content.
 393       if (!frame_provider_.get() ||
 394           frame_size != frame_provider_->frame_size() ||
 395           frame_size_in_dip != current_frame_size_in_dip_) {
 396         frame_provider_ = new cc::DelegatedFrameProvider(
 397             resource_collection_.get(), frame_data.Pass());
 398         client_->GetLayer()->SetShowDelegatedContent(frame_provider_.get(),
 399                                                      frame_size_in_dip);
 400       } else {
 401         frame_provider_->SetFrameData(frame_data.Pass());
 402       }
 403       modified_layers = true;
 404     }
 405   }
 406   released_front_lock_ = NULL;
 407   current_frame_size_in_dip_ = frame_size_in_dip;
 408   CheckResizeLock();
 409
 410   if (modified_layers) {
 411     // TODO(jbauman): Need to always tell the window observer about the
 412     // damage.
 413     client_->SchedulePaintInRect(damage_rect_in_dip);
 414   }
 415
 416   pending_delegated_ack_count_++;
 417
 418   ui::Compositor* compositor = client_->GetCompositor();
 419   if (!compositor || !modified_layers) {
 420     SendDelegatedFrameAck(output_surface_id);
 421   } else {
 422     std::vector<ui::LatencyInfo>::const_iterator it;
 423     for (it = latency_info.begin(); it != latency_info.end(); ++it)
 424       compositor->SetLatencyInfo(*it);
 425     // If we've previously skipped any latency infos add them.
 426     for (it = skipped_latency_info_list_.begin();
 427         it != skipped_latency_info_list_.end();
 428         ++it)
 429       compositor->SetLatencyInfo(*it);
 430     skipped_latency_info_list_.clear();
 431     AddOnCommitCallbackAndDisableLocks(
 432         base::Bind(&DelegatedFrameHost::SendDelegatedFrameAck,
 433                    AsWeakPtr(),
 434                    output_surface_id));
 435   }
 436   DidReceiveFrameFromRenderer(damage_rect);
 437   if (frame_provider_.get() || !surface_id_.is_null())
 438     delegated_frame_evictor_->SwappedFrame(!host->is_hidden());
 439   // Note: the frame may have been evicted immediately.
 440 }
 441
 442 void DelegatedFrameHost::SendDelegatedFrameAck(uint32 output_surface_id) {
 443   RenderWidgetHostImpl* host = client_->GetHost();
 444   cc::CompositorFrameAck ack;
 445   if (!surface_returned_resources_.empty())
 446     ack.resources.swap(surface_returned_resources_);
 447   if (resource_collection_)
 448     resource_collection_->TakeUnusedResourcesForChildCompositor(&ack.resources);
 449   RenderWidgetHostImpl::SendSwapCompositorFrameAck(host->GetRoutingID(),
 450                                                    output_surface_id,
 451                                                    host->GetProcess()->GetID(),
 452                                                    ack);
 453   DCHECK_GT(pending_delegated_ack_count_, 0);
 454   pending_delegated_ack_count_--;
 455 }
 456
 457 void DelegatedFrameHost::UnusedResourcesAreAvailable() {
 458   if (pending_delegated_ack_count_)
 459     return;
 460
 461   SendReturnedDelegatedResources(last_output_surface_id_);
 462 }
 463
 464 void DelegatedFrameHost::SendReturnedDelegatedResources(
 465     uint32 output_surface_id) {
 466   RenderWidgetHostImpl* host = client_->GetHost();
 467
 468   cc::CompositorFrameAck ack;
 469   if (!surface_returned_resources_.empty()) {
 470     ack.resources.swap(surface_returned_resources_);
 471   } else {
 472     DCHECK(resource_collection_);
 473     resource_collection_->TakeUnusedResourcesForChildCompositor(&ack.resources);
 474   }
 475   DCHECK(!ack.resources.empty());
 476
 477   RenderWidgetHostImpl::SendReclaimCompositorResources(
 478       host->GetRoutingID(),
 479       output_surface_id,
 480       host->GetProcess()->GetID(),
 481       ack);
 482 }
 483
 484 void DelegatedFrameHost::ReturnResources(
 485     const cc::ReturnedResourceArray& resources) {
 486   if (resources.empty())
 487     return;
 488   std::copy(resources.begin(),
 489             resources.end(),
 490             std::back_inserter(surface_returned_resources_));
 491   if (!pending_delegated_ack_count_)
 492     SendReturnedDelegatedResources(last_output_surface_id_);
 493 }
 494
 495 void DelegatedFrameHost::EvictDelegatedFrame() {
 496   client_->GetLayer()->SetShowPaintedContent();
 497   frame_provider_ = NULL;
 498   if (!surface_id_.is_null()) {
 499     surface_factory_->Destroy(surface_id_);
 500     surface_id_ = cc::SurfaceId();
 501   }
 502   delegated_frame_evictor_->DiscardedFrame();
 503 }
 504
 505 // static
 506 void DelegatedFrameHost::CopyFromCompositingSurfaceHasResult(
 507     const gfx::Size& dst_size_in_pixel,
 508     const SkColorType color_type,
 509     const base::Callback<void(bool, const SkBitmap&)>& callback,
 510     scoped_ptr<cc::CopyOutputResult> result) {
 511   if (result->IsEmpty() || result->size().IsEmpty()) {
 512     callback.Run(false, SkBitmap());
 513     return;
 514   }
 515
 516   if (result->HasTexture()) {
 517     PrepareTextureCopyOutputResult(dst_size_in_pixel, color_type,
 518                                    callback,
 519                                    result.Pass());
 520     return;
 521   }
 522
 523   DCHECK(result->HasBitmap());
 524   PrepareBitmapCopyOutputResult(dst_size_in_pixel, color_type, callback,
 525                                 result.Pass());
 526 }
 527
 528 static void CopyFromCompositingSurfaceFinished(
 529     const base::Callback<void(bool, const SkBitmap&)>& callback,
 530     scoped_ptr<cc::SingleReleaseCallback> release_callback,
 531     scoped_ptr<SkBitmap> bitmap,
 532     scoped_ptr<SkAutoLockPixels> bitmap_pixels_lock,
 533     bool result) {
 534   bitmap_pixels_lock.reset();
 535
 536   uint32 sync_point = 0;
 537   if (result) {
 538     GLHelper* gl_helper = ImageTransportFactory::GetInstance()->GetGLHelper();
 539     sync_point = gl_helper->InsertSyncPoint();
 540   }
 541   bool lost_resource = sync_point == 0;
 542   release_callback->Run(sync_point, lost_resource);
 543
 544   callback.Run(result, *bitmap);
 545 }
 546
 547 // static
 548 void DelegatedFrameHost::PrepareTextureCopyOutputResult(
 549     const gfx::Size& dst_size_in_pixel,
 550     const SkColorType color_type,
 551     const base::Callback<void(bool, const SkBitmap&)>& callback,
 552     scoped_ptr<cc::CopyOutputResult> result) {
 553   DCHECK(result->HasTexture());
 554   base::ScopedClosureRunner scoped_callback_runner(
 555       base::Bind(callback, false, SkBitmap()));
 556
 557   scoped_ptr<SkBitmap> bitmap(new SkBitmap);
 558   if (!bitmap->allocPixels(SkImageInfo::Make(dst_size_in_pixel.width(),
 559                                              dst_size_in_pixel.height(),
 560                                              color_type,
 561                                              kOpaque_SkAlphaType)))
 562     return;
 563
 564   ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
 565   GLHelper* gl_helper = factory->GetGLHelper();
 566   if (!gl_helper)
 567     return;
 568
 569   scoped_ptr<SkAutoLockPixels> bitmap_pixels_lock(
 570       new SkAutoLockPixels(*bitmap));
 571   uint8* pixels = static_cast<uint8*>(bitmap->getPixels());
 572
 573   cc::TextureMailbox texture_mailbox;
 574   scoped_ptr<cc::SingleReleaseCallback> release_callback;
 575   result->TakeTexture(&texture_mailbox, &release_callback);
 576   DCHECK(texture_mailbox.IsTexture());
 577
 578   ignore_result(scoped_callback_runner.Release());
 579
 580   gl_helper->CropScaleReadbackAndCleanMailbox(
 581       texture_mailbox.mailbox(),
 582       texture_mailbox.sync_point(),
 583       result->size(),
 584       gfx::Rect(result->size()),
 585       dst_size_in_pixel,
 586       pixels,
 587       color_type,
 588       base::Bind(&CopyFromCompositingSurfaceFinished,
 589                  callback,
 590                  base::Passed(&release_callback),
 591                  base::Passed(&bitmap),
 592                  base::Passed(&bitmap_pixels_lock)),
 593       GLHelper::SCALER_QUALITY_FAST);
 594 }
 595
 596 // static
 597 void DelegatedFrameHost::PrepareBitmapCopyOutputResult(
 598     const gfx::Size& dst_size_in_pixel,
 599     const SkColorType color_type,
 600     const base::Callback<void(bool, const SkBitmap&)>& callback,
 601     scoped_ptr<cc::CopyOutputResult> result) {
 602   if (color_type != kN32_SkColorType) {
 603     NOTIMPLEMENTED();
 604     callback.Run(false, SkBitmap());
 605     return;
 606   }
 607   DCHECK(result->HasBitmap());
 608   scoped_ptr<SkBitmap> source = result->TakeBitmap();
 609   DCHECK(source);
 610   SkBitmap bitmap = skia::ImageOperations::Resize(
 611       *source,
 612       skia::ImageOperations::RESIZE_BEST,
 613       dst_size_in_pixel.width(),
 614       dst_size_in_pixel.height());
 615   callback.Run(true, bitmap);
 616 }
 617
 618 // static
 619 void DelegatedFrameHost::ReturnSubscriberTexture(
 620     base::WeakPtr<DelegatedFrameHost> dfh,
 621     scoped_refptr<OwnedMailbox> subscriber_texture,
 622     uint32 sync_point) {
 623   if (!subscriber_texture.get())
 624     return;
 625   if (!dfh)
 626     return;
 627
 628   subscriber_texture->UpdateSyncPoint(sync_point);
 629
 630   if (dfh->frame_subscriber_ && subscriber_texture->texture_id())
 631     dfh->idle_frame_subscriber_textures_.push_back(subscriber_texture);
 632 }
 633
 634 void DelegatedFrameHost::CopyFromCompositingSurfaceFinishedForVideo(
 635     base::WeakPtr<DelegatedFrameHost> dfh,
 636     const base::Callback<void(bool)>& callback,
 637     scoped_refptr<OwnedMailbox> subscriber_texture,
 638     scoped_ptr<cc::SingleReleaseCallback> release_callback,
 639     bool result) {
 640   callback.Run(result);
 641
 642   uint32 sync_point = 0;
 643   if (result) {
 644     GLHelper* gl_helper = ImageTransportFactory::GetInstance()->GetGLHelper();
 645     sync_point = gl_helper->InsertSyncPoint();
 646   }
 647   if (release_callback) {
 648     // A release callback means the texture came from the compositor, so there
 649     // should be no |subscriber_texture|.
 650     DCHECK(!subscriber_texture);
 651     bool lost_resource = sync_point == 0;
 652     release_callback->Run(sync_point, lost_resource);
 653   }
 654   ReturnSubscriberTexture(dfh, subscriber_texture, sync_point);
 655 }
 656
 657 // static
 658 void DelegatedFrameHost::CopyFromCompositingSurfaceHasResultForVideo(
 659     base::WeakPtr<DelegatedFrameHost> dfh,
 660     scoped_refptr<OwnedMailbox> subscriber_texture,
 661     scoped_refptr<media::VideoFrame> video_frame,
 662     const base::Callback<void(bool)>& callback,
 663     scoped_ptr<cc::CopyOutputResult> result) {
 664   base::ScopedClosureRunner scoped_callback_runner(base::Bind(callback, false));
 665   base::ScopedClosureRunner scoped_return_subscriber_texture(
 666       base::Bind(&ReturnSubscriberTexture, dfh, subscriber_texture, 0));
 667
 668   if (!dfh)
 669     return;
 670   if (result->IsEmpty())
 671     return;
 672   if (result->size().IsEmpty())
 673     return;
 674
 675   // Compute the dest size we want after the letterboxing resize. Make the
 676   // coordinates and sizes even because we letterbox in YUV space
 677   // (see CopyRGBToVideoFrame). They need to be even for the UV samples to
 678   // line up correctly.
 679   // The video frame's coded_size() and the result's size() are both physical
 680   // pixels.
 681   gfx::Rect region_in_frame =
 682       media::ComputeLetterboxRegion(gfx::Rect(video_frame->coded_size()),
 683                                     result->size());
 684   region_in_frame = gfx::Rect(region_in_frame.x() & ~1,
 685                               region_in_frame.y() & ~1,
 686                               region_in_frame.width() & ~1,
 687                               region_in_frame.height() & ~1);
 688   if (region_in_frame.IsEmpty())
 689     return;
 690
 691   if (!result->HasTexture()) {
 692     DCHECK(result->HasBitmap());
 693     scoped_ptr<SkBitmap> bitmap = result->TakeBitmap();
 694     // Scale the bitmap to the required size, if necessary.
 695     SkBitmap scaled_bitmap;
 696     if (result->size().width() != region_in_frame.width() ||
 697         result->size().height() != region_in_frame.height()) {
 698       skia::ImageOperations::ResizeMethod method =
 699           skia::ImageOperations::RESIZE_GOOD;
 700       scaled_bitmap = skia::ImageOperations::Resize(*bitmap.get(), method,
 701                                                     region_in_frame.width(),
 702                                                     region_in_frame.height());
 703     } else {
 704       scaled_bitmap = *bitmap.get();
 705     }
 706
 707     {
 708       SkAutoLockPixels scaled_bitmap_locker(scaled_bitmap);
 709
 710       media::CopyRGBToVideoFrame(
 711           reinterpret_cast<uint8*>(scaled_bitmap.getPixels()),
 712           scaled_bitmap.rowBytes(),
 713           region_in_frame,
 714           video_frame.get());
 715     }
 716     ignore_result(scoped_callback_runner.Release());
 717     callback.Run(true);
 718     return;
 719   }
 720
 721   ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
 722   GLHelper* gl_helper = factory->GetGLHelper();
 723   if (!gl_helper)
 724     return;
 725   if (subscriber_texture.get() && !subscriber_texture->texture_id())
 726     return;
 727
 728   cc::TextureMailbox texture_mailbox;
 729   scoped_ptr<cc::SingleReleaseCallback> release_callback;
 730   result->TakeTexture(&texture_mailbox, &release_callback);
 731   DCHECK(texture_mailbox.IsTexture());
 732
 733   gfx::Rect result_rect(result->size());
 734
 735   content::ReadbackYUVInterface* yuv_readback_pipeline =
 736       dfh->yuv_readback_pipeline_.get();
 737   if (yuv_readback_pipeline == NULL ||
 738       yuv_readback_pipeline->scaler()->SrcSize() != result_rect.size() ||
 739       yuv_readback_pipeline->scaler()->SrcSubrect() != result_rect ||
 740       yuv_readback_pipeline->scaler()->DstSize() != region_in_frame.size()) {
 741     GLHelper::ScalerQuality quality = GLHelper::SCALER_QUALITY_FAST;
 742     std::string quality_switch = switches::kTabCaptureDownscaleQuality;
 743     // If we're scaling up, we can use the "best" quality.
 744     if (result_rect.size().width() < region_in_frame.size().width() &&
 745         result_rect.size().height() < region_in_frame.size().height())
 746       quality_switch = switches::kTabCaptureUpscaleQuality;
 747
 748     std::string switch_value =
 749         base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
 750             quality_switch);
 751     if (switch_value == "fast")
 752       quality = GLHelper::SCALER_QUALITY_FAST;
 753     else if (switch_value == "good")
 754       quality = GLHelper::SCALER_QUALITY_GOOD;
 755     else if (switch_value == "best")
 756       quality = GLHelper::SCALER_QUALITY_BEST;
 757
 758     dfh->yuv_readback_pipeline_.reset(
 759         gl_helper->CreateReadbackPipelineYUV(quality,
 760                                              result_rect.size(),
 761                                              result_rect,
 762                                              video_frame->coded_size(),
 763                                              region_in_frame,
 764                                              true,
 765                                              true));
 766     yuv_readback_pipeline = dfh->yuv_readback_pipeline_.get();
 767   }
 768
 769   ignore_result(scoped_callback_runner.Release());
 770   ignore_result(scoped_return_subscriber_texture.Release());
 771   base::Callback<void(bool result)> finished_callback = base::Bind(
 772       &DelegatedFrameHost::CopyFromCompositingSurfaceFinishedForVideo,
 773       dfh->AsWeakPtr(),
 774       callback,
 775       subscriber_texture,
 776       base::Passed(&release_callback));
 777   yuv_readback_pipeline->ReadbackYUV(texture_mailbox.mailbox(),
 778                                      texture_mailbox.sync_point(),
 779                                      video_frame.get(),
 780                                      finished_callback);
 781 }
 782
 783 ////////////////////////////////////////////////////////////////////////////////
 784 // DelegatedFrameHost, ui::CompositorObserver implementation:
 785
 786 void DelegatedFrameHost::OnCompositingDidCommit(
 787     ui::Compositor* compositor) {
 788   RenderWidgetHostImpl* host = client_->GetHost();
 789   if (can_lock_compositor_ == NO_PENDING_COMMIT) {
 790     can_lock_compositor_ = YES_CAN_LOCK;
 791     if (resize_lock_.get() && resize_lock_->GrabDeferredLock())
 792       can_lock_compositor_ = YES_DID_LOCK;
 793   }
 794   RunOnCommitCallbacks();
 795   if (resize_lock_ &&
 796       resize_lock_->expected_size() == current_frame_size_in_dip_) {
 797     resize_lock_.reset();
 798     host->WasResized();
 799     // We may have had a resize while we had the lock (e.g. if the lock expired,
 800     // or if the UI still gave us some resizes), so make sure we grab a new lock
 801     // if necessary.
 802     MaybeCreateResizeLock();
 803   }
 804 }
 805
 806 void DelegatedFrameHost::OnCompositingStarted(
 807     ui::Compositor* compositor, base::TimeTicks start_time) {
 808   last_draw_ended_ = start_time;
 809 }
 810
 811 void DelegatedFrameHost::OnCompositingEnded(
 812     ui::Compositor* compositor) {
 813 }
 814
 815 void DelegatedFrameHost::OnCompositingAborted(ui::Compositor* compositor) {
 816 }
 817
 818 void DelegatedFrameHost::OnCompositingLockStateChanged(
 819     ui::Compositor* compositor) {
 820   // A compositor lock that is part of a resize lock timed out. We
 821   // should display a renderer frame.
 822   if (!compositor->IsLocked() && can_lock_compositor_ == YES_DID_LOCK) {
 823     can_lock_compositor_ = NO_PENDING_RENDERER_FRAME;
 824   }
 825 }
 826
 827 void DelegatedFrameHost::OnUpdateVSyncParameters(
 828     base::TimeTicks timebase,
 829     base::TimeDelta interval) {
 830   vsync_timebase_ = timebase;
 831   vsync_interval_ = interval;
 832   RenderWidgetHostImpl* host = client_->GetHost();
 833   if (client_->IsVisible())
 834     host->UpdateVSyncParameters(timebase, interval);
 835 }
 836
 837 ////////////////////////////////////////////////////////////////////////////////
 838 // RenderWidgetHostViewAura, ImageTransportFactoryObserver implementation:
 839
 840 void DelegatedFrameHost::OnLostResources() {
 841   RenderWidgetHostImpl* host = client_->GetHost();
 842   if (frame_provider_.get() || !surface_id_.is_null())
 843     EvictDelegatedFrame();
 844   idle_frame_subscriber_textures_.clear();
 845   yuv_readback_pipeline_.reset();
 846
 847   host->ScheduleComposite();
 848 }
 849
 850 ////////////////////////////////////////////////////////////////////////////////
 851 // DelegatedFrameHost, private:
 852
 853 DelegatedFrameHost::~DelegatedFrameHost() {
 854   ImageTransportFactory::GetInstance()->RemoveObserver(this);
 855
 856   if (!surface_id_.is_null())
 857     surface_factory_->Destroy(surface_id_);
 858   if (resource_collection_.get())
 859     resource_collection_->SetClient(NULL);
 860
 861   DCHECK(!vsync_manager_);
 862 }
 863
 864 void DelegatedFrameHost::RunOnCommitCallbacks() {
 865   for (std::vector<base::Closure>::const_iterator
 866       it = on_compositing_did_commit_callbacks_.begin();
 867       it != on_compositing_did_commit_callbacks_.end(); ++it) {
 868     it->Run();
 869   }
 870   on_compositing_did_commit_callbacks_.clear();
 871 }
 872
 873 void DelegatedFrameHost::AddOnCommitCallbackAndDisableLocks(
 874     const base::Closure& callback) {
 875   ui::Compositor* compositor = client_->GetCompositor();
 876   DCHECK(compositor);
 877
 878   if (!compositor->HasObserver(this))
 879     compositor->AddObserver(this);
 880
 881   can_lock_compositor_ = NO_PENDING_COMMIT;
 882   on_compositing_did_commit_callbacks_.push_back(callback);
 883 }
 884
 885 void DelegatedFrameHost::AddedToWindow() {
 886   ui::Compositor* compositor = client_->GetCompositor();
 887   if (compositor) {
 888     DCHECK(!vsync_manager_);
 889     vsync_manager_ = compositor->vsync_manager();
 890     vsync_manager_->AddObserver(this);
 891   }
 892 }
 893
 894 void DelegatedFrameHost::RemovingFromWindow() {
 895   RunOnCommitCallbacks();
 896   resize_lock_.reset();
 897   client_->GetHost()->WasResized();
 898   ui::Compositor* compositor = client_->GetCompositor();
 899   if (compositor && compositor->HasObserver(this))
 900     compositor->RemoveObserver(this);
 901
 902   if (vsync_manager_) {
 903     vsync_manager_->RemoveObserver(this);
 904     vsync_manager_ = NULL;
 905   }
 906 }
 907
 908 void DelegatedFrameHost::LockResources() {
 909   DCHECK(frame_provider_ || !surface_id_.is_null());
 910   delegated_frame_evictor_->LockFrame();
 911 }
 912
 913 void DelegatedFrameHost::UnlockResources() {
 914   DCHECK(frame_provider_ || !surface_id_.is_null());
 915   delegated_frame_evictor_->UnlockFrame();
 916 }
 917
 918 ////////////////////////////////////////////////////////////////////////////////
 919 // DelegatedFrameHost, ui::LayerOwnerDelegate implementation:
 920
 921 void DelegatedFrameHost::OnLayerRecreated(ui::Layer* old_layer,
 922                                                 ui::Layer* new_layer) {
 923   // The new_layer is the one that will be used by our Window, so that's the one
 924   // that should keep our frame. old_layer will be returned to the
 925   // RecreateLayer caller, and should have a copy.
 926   if (frame_provider_.get()) {
 927     new_layer->SetShowDelegatedContent(frame_provider_.get(),
 928                                        current_frame_size_in_dip_);
 929   }
 930   if (!surface_id_.is_null()) {
 931     new_layer->SetShowSurface(surface_id_, current_frame_size_in_dip_);
 932   }
 933 }
 934
 935 }  // namespace content