src/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 "content/browser/compositor/resize_lock.h"
  15 #include "content/public/browser/render_widget_host_view_frame_subscriber.h"
  16 #include "content/public/common/content_switches.h"
  17 #include "media/base/video_frame.h"
  18 #include "media/base/video_util.h"
  19 #include "skia/ext/image_operations.h"
  20
  21 namespace content {
  22
  23 ////////////////////////////////////////////////////////////////////////////////
  24 // DelegatedFrameHostClient
  25
  26 bool DelegatedFrameHostClient::ShouldCreateResizeLock() {
  27   return GetDelegatedFrameHost()->ShouldCreateResizeLock();
  28 }
  29
  30 void DelegatedFrameHostClient::RequestCopyOfOutput(
  31     scoped_ptr<cc::CopyOutputRequest> request) {
  32   GetDelegatedFrameHost()->RequestCopyOfOutput(request.Pass());
  33 }
  34
  35 ////////////////////////////////////////////////////////////////////////////////
  36 // DelegatedFrameHost
  37
  38 DelegatedFrameHost::DelegatedFrameHost(DelegatedFrameHostClient* client)
  39     : client_(client),
  40       last_output_surface_id_(0),
  41       pending_delegated_ack_count_(0),
  42       skipped_frames_(false),
  43       can_lock_compositor_(YES),
  44       delegated_frame_evictor_(new DelegatedFrameEvictor(this)) {
  45   ImageTransportFactory::GetInstance()->AddObserver(this);
  46 }
  47
  48 void DelegatedFrameHost::WasShown() {
  49   RenderWidgetHostImpl* host = client_->GetHost();
  50   delegated_frame_evictor_->SetVisible(true);
  51
  52   if (host->is_accelerated_compositing_active() &&
  53       !released_front_lock_.get()) {
  54     ui::Compositor* compositor = client_->GetCompositor();
  55     if (compositor)
  56       released_front_lock_ = compositor->GetCompositorLock();
  57   }
  58 }
  59
  60 void DelegatedFrameHost::WasHidden() {
  61   delegated_frame_evictor_->SetVisible(false);
  62   released_front_lock_ = NULL;
  63 }
  64
  65 void DelegatedFrameHost::MaybeCreateResizeLock() {
  66   if (!client_->ShouldCreateResizeLock())
  67     return;
  68   DCHECK(client_->GetCompositor());
  69
  70   // Listen to changes in the compositor lock state.
  71   ui::Compositor* compositor = client_->GetCompositor();
  72   if (!compositor->HasObserver(this))
  73     compositor->AddObserver(this);
  74
  75   bool defer_compositor_lock =
  76       can_lock_compositor_ == NO_PENDING_RENDERER_FRAME ||
  77       can_lock_compositor_ == NO_PENDING_COMMIT;
  78
  79   if (can_lock_compositor_ == YES)
  80     can_lock_compositor_ = YES_DID_LOCK;
  81
  82   resize_lock_ = client_->CreateResizeLock(defer_compositor_lock);
  83 }
  84
  85 bool DelegatedFrameHost::ShouldCreateResizeLock() {
  86   RenderWidgetHostImpl* host = client_->GetHost();
  87
  88   // On Windows while resizing, the the resize locks makes us mis-paint a white
  89   // vertical strip (including the non-client area) if the content composition
  90   // is lagging the UI composition. So here we disable the throttling so that
  91   // the UI bits can draw ahead of the content thereby reducing the amount of
  92   // whiteout. Because this causes the content to be drawn at wrong sizes while
  93   // resizing we compensate by blocking the UI thread in Compositor::Draw() by
  94   // issuing a FinishAllRendering() if we are resizing.
  95 #if defined(OS_WIN)
  96   return false;
  97 #else
  98   if (resize_lock_)
  99     return false;
 100
 101   if (host->should_auto_resize())
 102     return false;
 103   if (!host->is_accelerated_compositing_active())
 104     return false;
 105
 106   gfx::Size desired_size = client_->DesiredFrameSize();
 107   if (desired_size == current_frame_size_in_dip_)
 108     return false;
 109
 110   ui::Compositor* compositor = client_->GetCompositor();
 111   if (!compositor)
 112     return false;
 113
 114   return true;
 115 #endif
 116 }
 117
 118 void DelegatedFrameHost::RequestCopyOfOutput(
 119     scoped_ptr<cc::CopyOutputRequest> request) {
 120   client_->GetLayer()->RequestCopyOfOutput(request.Pass());
 121 }
 122
 123 gfx::Rect DelegatedFrameHost::GetViewBoundsWithResizeLock(
 124     const gfx::Rect& bounds) const {
 125   if (resize_lock_.get())
 126     return gfx::Rect(bounds.origin(), resize_lock_->expected_size());
 127   else
 128     return bounds;
 129 }
 130
 131 void DelegatedFrameHost::CopyFromCompositingSurface(
 132     const gfx::Rect& src_subrect,
 133     const gfx::Size& dst_size,
 134     const base::Callback<void(bool, const SkBitmap&)>& callback,
 135     const SkBitmap::Config config) {
 136   // Only ARGB888 and RGB565 supported as of now.
 137   bool format_support = ((config == SkBitmap::kRGB_565_Config) ||
 138                          (config == SkBitmap::kARGB_8888_Config));
 139   if (!format_support) {
 140     DCHECK(format_support);
 141     callback.Run(false, SkBitmap());
 142     return;
 143   }
 144   if (!CanCopyToBitmap()) {
 145     callback.Run(false, SkBitmap());
 146     return;
 147   }
 148
 149   const gfx::Size& dst_size_in_pixel = client_->ConvertViewSizeToPixel(
 150       dst_size);
 151   scoped_ptr<cc::CopyOutputRequest> request =
 152       cc::CopyOutputRequest::CreateRequest(base::Bind(
 153           &DelegatedFrameHost::CopyFromCompositingSurfaceHasResult,
 154           dst_size_in_pixel,
 155           config,
 156           callback));
 157   gfx::Rect src_subrect_in_pixel =
 158       ConvertRectToPixel(client_->CurrentDeviceScaleFactor(), src_subrect);
 159   request->set_area(src_subrect_in_pixel);
 160   client_->RequestCopyOfOutput(request.Pass());
 161 }
 162
 163 void DelegatedFrameHost::CopyFromCompositingSurfaceToVideoFrame(
 164       const gfx::Rect& src_subrect,
 165       const scoped_refptr<media::VideoFrame>& target,
 166       const base::Callback<void(bool)>& callback) {
 167   if (!CanCopyToVideoFrame()) {
 168     callback.Run(false);
 169     return;
 170   }
 171
 172   // Try get a texture to reuse.
 173   scoped_refptr<OwnedMailbox> subscriber_texture;
 174   if (frame_subscriber_) {
 175     if (!idle_frame_subscriber_textures_.empty()) {
 176       subscriber_texture = idle_frame_subscriber_textures_.back();
 177       idle_frame_subscriber_textures_.pop_back();
 178     } else if (GLHelper* helper =
 179                    ImageTransportFactory::GetInstance()->GetGLHelper()) {
 180       subscriber_texture = new OwnedMailbox(helper);
 181     }
 182     if (subscriber_texture.get())
 183       active_frame_subscriber_textures_.insert(subscriber_texture.get());
 184   }
 185
 186   scoped_ptr<cc::CopyOutputRequest> request =
 187       cc::CopyOutputRequest::CreateRequest(base::Bind(
 188           &DelegatedFrameHost::
 189                CopyFromCompositingSurfaceHasResultForVideo,
 190           AsWeakPtr(),  // For caching the ReadbackYUVInterface on this class.
 191           subscriber_texture,
 192           target,
 193           callback));
 194   gfx::Rect src_subrect_in_pixel =
 195       ConvertRectToPixel(client_->CurrentDeviceScaleFactor(), src_subrect);
 196   request->set_area(src_subrect_in_pixel);
 197   if (subscriber_texture.get()) {
 198     request->SetTextureMailbox(
 199         cc::TextureMailbox(subscriber_texture->mailbox(),
 200                            subscriber_texture->target(),
 201                            subscriber_texture->sync_point()));
 202   }
 203   client_->RequestCopyOfOutput(request.Pass());
 204 }
 205
 206 bool DelegatedFrameHost::CanCopyToBitmap() const {
 207   return client_->GetCompositor() &&
 208          client_->GetLayer()->has_external_content();
 209 }
 210
 211 bool DelegatedFrameHost::CanCopyToVideoFrame() const {
 212   RenderWidgetHostImpl* host = client_->GetHost();
 213   return client_->GetCompositor() &&
 214          client_->GetLayer()->has_external_content() &&
 215          host->is_accelerated_compositing_active();
 216 }
 217
 218 bool DelegatedFrameHost::CanSubscribeFrame() const {
 219   return true;
 220 }
 221
 222 void DelegatedFrameHost::BeginFrameSubscription(
 223     scoped_ptr<RenderWidgetHostViewFrameSubscriber> subscriber) {
 224   frame_subscriber_ = subscriber.Pass();
 225 }
 226
 227 void DelegatedFrameHost::EndFrameSubscription() {
 228   idle_frame_subscriber_textures_.clear();
 229   frame_subscriber_.reset();
 230 }
 231
 232 bool DelegatedFrameHost::ShouldSkipFrame(gfx::Size size_in_dip) const {
 233   if (can_lock_compositor_ == NO_PENDING_RENDERER_FRAME ||
 234       can_lock_compositor_ == NO_PENDING_COMMIT ||
 235       !resize_lock_.get())
 236     return false;
 237
 238   return size_in_dip != resize_lock_->expected_size();
 239 }
 240
 241 void DelegatedFrameHost::WasResized() {
 242   MaybeCreateResizeLock();
 243 }
 244
 245 void DelegatedFrameHost::CheckResizeLock() {
 246   if (!resize_lock_ ||
 247       resize_lock_->expected_size() != current_frame_size_in_dip_)
 248     return;
 249
 250   // Since we got the size we were looking for, unlock the compositor. But delay
 251   // the release of the lock until we've kicked a frame with the new texture, to
 252   // avoid resizing the UI before we have a chance to draw a "good" frame.
 253   resize_lock_->UnlockCompositor();
 254   ui::Compositor* compositor = client_->GetCompositor();
 255   if (compositor) {
 256     if (!compositor->HasObserver(this))
 257       compositor->AddObserver(this);
 258   }
 259 }
 260
 261 void DelegatedFrameHost::DidReceiveFrameFromRenderer() {
 262   if (frame_subscriber() && CanCopyToVideoFrame()) {
 263     const base::TimeTicks present_time = base::TimeTicks::Now();
 264     scoped_refptr<media::VideoFrame> frame;
 265     RenderWidgetHostViewFrameSubscriber::DeliverFrameCallback callback;
 266     if (frame_subscriber()->ShouldCaptureFrame(present_time,
 267                                                &frame, &callback)) {
 268       CopyFromCompositingSurfaceToVideoFrame(
 269           gfx::Rect(current_frame_size_in_dip_),
 270           frame,
 271           base::Bind(callback, present_time));
 272     }
 273   }
 274 }
 275
 276 void DelegatedFrameHost::SwapDelegatedFrame(
 277     uint32 output_surface_id,
 278     scoped_ptr<cc::DelegatedFrameData> frame_data,
 279     float frame_device_scale_factor,
 280     const std::vector<ui::LatencyInfo>& latency_info) {
 281   RenderWidgetHostImpl* host = client_->GetHost();
 282   DCHECK_NE(0u, frame_data->render_pass_list.size());
 283
 284   cc::RenderPass* root_pass = frame_data->render_pass_list.back();
 285
 286   gfx::Size frame_size = root_pass->output_rect.size();
 287   gfx::Size frame_size_in_dip =
 288       ConvertSizeToDIP(frame_device_scale_factor, frame_size);
 289
 290   gfx::Rect damage_rect = gfx::ToEnclosingRect(root_pass->damage_rect);
 291   damage_rect.Intersect(gfx::Rect(frame_size));
 292   gfx::Rect damage_rect_in_dip =
 293       ConvertRectToDIP(frame_device_scale_factor, damage_rect);
 294
 295   if (ShouldSkipFrame(frame_size_in_dip)) {
 296     cc::CompositorFrameAck ack;
 297     cc::TransferableResource::ReturnResources(frame_data->resource_list,
 298                                               &ack.resources);
 299     RenderWidgetHostImpl::SendSwapCompositorFrameAck(
 300         host->GetRoutingID(), output_surface_id,
 301         host->GetProcess()->GetID(), ack);
 302     skipped_frames_ = true;
 303     return;
 304   }
 305
 306   if (skipped_frames_) {
 307     skipped_frames_ = false;
 308     damage_rect = gfx::Rect(frame_size);
 309     damage_rect_in_dip = gfx::Rect(frame_size_in_dip);
 310
 311     // Give the same damage rect to the compositor.
 312     cc::RenderPass* root_pass = frame_data->render_pass_list.back();
 313     root_pass->damage_rect = damage_rect;
 314   }
 315
 316   if (output_surface_id != last_output_surface_id_) {
 317     // Resource ids are scoped by the output surface.
 318     // If the originating output surface doesn't match the last one, it
 319     // indicates the renderer's output surface may have been recreated, in which
 320     // case we should recreate the DelegatedRendererLayer, to avoid matching
 321     // resources from the old one with resources from the new one which would
 322     // have the same id. Changing the layer to showing painted content destroys
 323     // the DelegatedRendererLayer.
 324     EvictDelegatedFrame();
 325
 326     // Drop the cc::DelegatedFrameResourceCollection so that we will not return
 327     // any resources from the old output surface with the new output surface id.
 328     if (resource_collection_.get()) {
 329       resource_collection_->SetClient(NULL);
 330
 331       if (resource_collection_->LoseAllResources())
 332         SendReturnedDelegatedResources(last_output_surface_id_);
 333
 334       resource_collection_ = NULL;
 335     }
 336     last_output_surface_id_ = output_surface_id;
 337   }
 338   if (frame_size.IsEmpty()) {
 339     DCHECK_EQ(0u, frame_data->resource_list.size());
 340     EvictDelegatedFrame();
 341   } else {
 342     if (!resource_collection_) {
 343       resource_collection_ = new cc::DelegatedFrameResourceCollection;
 344       resource_collection_->SetClient(this);
 345     }
 346     // If the physical frame size changes, we need a new |frame_provider_|. If
 347     // the physical frame size is the same, but the size in DIP changed, we
 348     // need to adjust the scale at which the frames will be drawn, and we do
 349     // this by making a new |frame_provider_| also to ensure the scale change
 350     // is presented in sync with the new frame content.
 351     if (!frame_provider_.get() || frame_size != frame_provider_->frame_size() ||
 352         frame_size_in_dip != current_frame_size_in_dip_) {
 353       frame_provider_ = new cc::DelegatedFrameProvider(
 354           resource_collection_.get(), frame_data.Pass());
 355       client_->GetLayer()->SetShowDelegatedContent(frame_provider_.get(),
 356                                                    frame_size_in_dip);
 357     } else {
 358       frame_provider_->SetFrameData(frame_data.Pass());
 359     }
 360   }
 361   released_front_lock_ = NULL;
 362   current_frame_size_in_dip_ = frame_size_in_dip;
 363   CheckResizeLock();
 364
 365   client_->SchedulePaintInRect(damage_rect_in_dip);
 366
 367   pending_delegated_ack_count_++;
 368
 369   ui::Compositor* compositor = client_->GetCompositor();
 370   if (!compositor) {
 371     SendDelegatedFrameAck(output_surface_id);
 372   } else {
 373     for (size_t i = 0; i < latency_info.size(); i++)
 374       compositor->SetLatencyInfo(latency_info[i]);
 375     AddOnCommitCallbackAndDisableLocks(
 376         base::Bind(&DelegatedFrameHost::SendDelegatedFrameAck,
 377                    AsWeakPtr(),
 378                    output_surface_id));
 379   }
 380   DidReceiveFrameFromRenderer();
 381   if (frame_provider_.get())
 382     delegated_frame_evictor_->SwappedFrame(!host->is_hidden());
 383   // Note: the frame may have been evicted immediately.
 384 }
 385
 386 void DelegatedFrameHost::SendDelegatedFrameAck(uint32 output_surface_id) {
 387   RenderWidgetHostImpl* host = client_->GetHost();
 388   cc::CompositorFrameAck ack;
 389   if (resource_collection_)
 390     resource_collection_->TakeUnusedResourcesForChildCompositor(&ack.resources);
 391   RenderWidgetHostImpl::SendSwapCompositorFrameAck(host->GetRoutingID(),
 392                                                    output_surface_id,
 393                                                    host->GetProcess()->GetID(),
 394                                                    ack);
 395   DCHECK_GT(pending_delegated_ack_count_, 0);
 396   pending_delegated_ack_count_--;
 397 }
 398
 399 void DelegatedFrameHost::UnusedResourcesAreAvailable() {
 400   if (pending_delegated_ack_count_)
 401     return;
 402
 403   SendReturnedDelegatedResources(last_output_surface_id_);
 404 }
 405
 406 void DelegatedFrameHost::SendReturnedDelegatedResources(
 407     uint32 output_surface_id) {
 408   RenderWidgetHostImpl* host = client_->GetHost();
 409   DCHECK(resource_collection_);
 410
 411   cc::CompositorFrameAck ack;
 412   resource_collection_->TakeUnusedResourcesForChildCompositor(&ack.resources);
 413   DCHECK(!ack.resources.empty());
 414
 415   RenderWidgetHostImpl::SendReclaimCompositorResources(
 416       host->GetRoutingID(),
 417       output_surface_id,
 418       host->GetProcess()->GetID(),
 419       ack);
 420 }
 421
 422 void DelegatedFrameHost::EvictDelegatedFrame() {
 423   client_->GetLayer()->SetShowPaintedContent();
 424   frame_provider_ = NULL;
 425   delegated_frame_evictor_->DiscardedFrame();
 426 }
 427
 428 // static
 429 void DelegatedFrameHost::CopyFromCompositingSurfaceHasResult(
 430     const gfx::Size& dst_size_in_pixel,
 431     const SkBitmap::Config config,
 432     const base::Callback<void(bool, const SkBitmap&)>& callback,
 433     scoped_ptr<cc::CopyOutputResult> result) {
 434   if (result->IsEmpty() || result->size().IsEmpty()) {
 435     callback.Run(false, SkBitmap());
 436     return;
 437   }
 438
 439   if (result->HasTexture()) {
 440     PrepareTextureCopyOutputResult(dst_size_in_pixel, config,
 441                                    callback,
 442                                    result.Pass());
 443     return;
 444   }
 445
 446   DCHECK(result->HasBitmap());
 447   PrepareBitmapCopyOutputResult(dst_size_in_pixel, config, callback,
 448                                 result.Pass());
 449 }
 450
 451 static void CopyFromCompositingSurfaceFinished(
 452     const base::Callback<void(bool, const SkBitmap&)>& callback,
 453     scoped_ptr<cc::SingleReleaseCallback> release_callback,
 454     scoped_ptr<SkBitmap> bitmap,
 455     scoped_ptr<SkAutoLockPixels> bitmap_pixels_lock,
 456     bool result) {
 457   bitmap_pixels_lock.reset();
 458
 459   uint32 sync_point = 0;
 460   if (result) {
 461     GLHelper* gl_helper = ImageTransportFactory::GetInstance()->GetGLHelper();
 462     sync_point = gl_helper->InsertSyncPoint();
 463   }
 464   bool lost_resource = sync_point == 0;
 465   release_callback->Run(sync_point, lost_resource);
 466
 467   callback.Run(result, *bitmap);
 468 }
 469
 470 // static
 471 void DelegatedFrameHost::PrepareTextureCopyOutputResult(
 472     const gfx::Size& dst_size_in_pixel,
 473     const SkBitmap::Config config,
 474     const base::Callback<void(bool, const SkBitmap&)>& callback,
 475     scoped_ptr<cc::CopyOutputResult> result) {
 476   DCHECK(result->HasTexture());
 477   base::ScopedClosureRunner scoped_callback_runner(
 478       base::Bind(callback, false, SkBitmap()));
 479
 480   scoped_ptr<SkBitmap> bitmap(new SkBitmap);
 481   bitmap->setConfig(config,
 482                     dst_size_in_pixel.width(), dst_size_in_pixel.height(),
 483                     0, kOpaque_SkAlphaType);
 484   if (!bitmap->allocPixels())
 485     return;
 486
 487   ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
 488   GLHelper* gl_helper = factory->GetGLHelper();
 489   if (!gl_helper)
 490     return;
 491
 492   scoped_ptr<SkAutoLockPixels> bitmap_pixels_lock(
 493       new SkAutoLockPixels(*bitmap));
 494   uint8* pixels = static_cast<uint8*>(bitmap->getPixels());
 495
 496   cc::TextureMailbox texture_mailbox;
 497   scoped_ptr<cc::SingleReleaseCallback> release_callback;
 498   result->TakeTexture(&texture_mailbox, &release_callback);
 499   DCHECK(texture_mailbox.IsTexture());
 500   if (!texture_mailbox.IsTexture())
 501     return;
 502
 503   ignore_result(scoped_callback_runner.Release());
 504
 505   gl_helper->CropScaleReadbackAndCleanMailbox(
 506       texture_mailbox.mailbox(),
 507       texture_mailbox.sync_point(),
 508       result->size(),
 509       gfx::Rect(result->size()),
 510       dst_size_in_pixel,
 511       pixels,
 512       config,
 513       base::Bind(&CopyFromCompositingSurfaceFinished,
 514                  callback,
 515                  base::Passed(&release_callback),
 516                  base::Passed(&bitmap),
 517                  base::Passed(&bitmap_pixels_lock)));
 518 }
 519
 520 // static
 521 void DelegatedFrameHost::PrepareBitmapCopyOutputResult(
 522     const gfx::Size& dst_size_in_pixel,
 523     const SkBitmap::Config config,
 524     const base::Callback<void(bool, const SkBitmap&)>& callback,
 525     scoped_ptr<cc::CopyOutputResult> result) {
 526   if (config != SkBitmap::kARGB_8888_Config) {
 527     NOTIMPLEMENTED();
 528     callback.Run(false, SkBitmap());
 529     return;
 530   }
 531   DCHECK(result->HasBitmap());
 532   base::ScopedClosureRunner scoped_callback_runner(
 533       base::Bind(callback, false, SkBitmap()));
 534
 535   scoped_ptr<SkBitmap> source = result->TakeBitmap();
 536   DCHECK(source);
 537   if (!source)
 538     return;
 539
 540   ignore_result(scoped_callback_runner.Release());
 541
 542   SkBitmap bitmap = skia::ImageOperations::Resize(
 543       *source,
 544       skia::ImageOperations::RESIZE_BEST,
 545       dst_size_in_pixel.width(),
 546       dst_size_in_pixel.height());
 547   callback.Run(true, bitmap);
 548 }
 549
 550 // static
 551 void DelegatedFrameHost::ReturnSubscriberTexture(
 552     base::WeakPtr<DelegatedFrameHost> dfh,
 553     scoped_refptr<OwnedMailbox> subscriber_texture,
 554     uint32 sync_point) {
 555   if (!subscriber_texture.get())
 556     return;
 557   if (!dfh)
 558     return;
 559   DCHECK_NE(
 560       dfh->active_frame_subscriber_textures_.count(subscriber_texture.get()),
 561       0u);
 562
 563   subscriber_texture->UpdateSyncPoint(sync_point);
 564
 565   dfh->active_frame_subscriber_textures_.erase(subscriber_texture.get());
 566   if (dfh->frame_subscriber_ && subscriber_texture->texture_id())
 567     dfh->idle_frame_subscriber_textures_.push_back(subscriber_texture);
 568 }
 569
 570 void DelegatedFrameHost::CopyFromCompositingSurfaceFinishedForVideo(
 571     base::WeakPtr<DelegatedFrameHost> dfh,
 572     const base::Callback<void(bool)>& callback,
 573     scoped_refptr<OwnedMailbox> subscriber_texture,
 574     scoped_ptr<cc::SingleReleaseCallback> release_callback,
 575     bool result) {
 576   callback.Run(result);
 577
 578   uint32 sync_point = 0;
 579   if (result) {
 580     GLHelper* gl_helper = ImageTransportFactory::GetInstance()->GetGLHelper();
 581     sync_point = gl_helper->InsertSyncPoint();
 582   }
 583   if (release_callback) {
 584     // A release callback means the texture came from the compositor, so there
 585     // should be no |subscriber_texture|.
 586     DCHECK(!subscriber_texture);
 587     bool lost_resource = sync_point == 0;
 588     release_callback->Run(sync_point, lost_resource);
 589   }
 590   ReturnSubscriberTexture(dfh, subscriber_texture, sync_point);
 591 }
 592
 593 // static
 594 void DelegatedFrameHost::CopyFromCompositingSurfaceHasResultForVideo(
 595     base::WeakPtr<DelegatedFrameHost> dfh,
 596     scoped_refptr<OwnedMailbox> subscriber_texture,
 597     scoped_refptr<media::VideoFrame> video_frame,
 598     const base::Callback<void(bool)>& callback,
 599     scoped_ptr<cc::CopyOutputResult> result) {
 600   base::ScopedClosureRunner scoped_callback_runner(base::Bind(callback, false));
 601   base::ScopedClosureRunner scoped_return_subscriber_texture(
 602       base::Bind(&ReturnSubscriberTexture, dfh, subscriber_texture, 0));
 603
 604   if (!dfh)
 605     return;
 606   if (result->IsEmpty())
 607     return;
 608   if (result->size().IsEmpty())
 609     return;
 610
 611   // Compute the dest size we want after the letterboxing resize. Make the
 612   // coordinates and sizes even because we letterbox in YUV space
 613   // (see CopyRGBToVideoFrame). They need to be even for the UV samples to
 614   // line up correctly.
 615   // The video frame's coded_size() and the result's size() are both physical
 616   // pixels.
 617   gfx::Rect region_in_frame =
 618       media::ComputeLetterboxRegion(gfx::Rect(video_frame->coded_size()),
 619                                     result->size());
 620   region_in_frame = gfx::Rect(region_in_frame.x() & ~1,
 621                               region_in_frame.y() & ~1,
 622                               region_in_frame.width() & ~1,
 623                               region_in_frame.height() & ~1);
 624   if (region_in_frame.IsEmpty())
 625     return;
 626
 627   if (!result->HasTexture()) {
 628     DCHECK(result->HasBitmap());
 629     scoped_ptr<SkBitmap> bitmap = result->TakeBitmap();
 630     // Scale the bitmap to the required size, if necessary.
 631     SkBitmap scaled_bitmap;
 632     if (result->size().width() != region_in_frame.width() ||
 633         result->size().height() != region_in_frame.height()) {
 634       skia::ImageOperations::ResizeMethod method =
 635           skia::ImageOperations::RESIZE_GOOD;
 636       scaled_bitmap = skia::ImageOperations::Resize(*bitmap.get(), method,
 637                                                     region_in_frame.width(),
 638                                                     region_in_frame.height());
 639     } else {
 640       scaled_bitmap = *bitmap.get();
 641     }
 642
 643     {
 644       SkAutoLockPixels scaled_bitmap_locker(scaled_bitmap);
 645
 646       media::CopyRGBToVideoFrame(
 647           reinterpret_cast<uint8*>(scaled_bitmap.getPixels()),
 648           scaled_bitmap.rowBytes(),
 649           region_in_frame,
 650           video_frame.get());
 651     }
 652     ignore_result(scoped_callback_runner.Release());
 653     callback.Run(true);
 654     return;
 655   }
 656
 657   ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
 658   GLHelper* gl_helper = factory->GetGLHelper();
 659   if (!gl_helper)
 660     return;
 661   if (subscriber_texture.get() && !subscriber_texture->texture_id())
 662     return;
 663
 664   cc::TextureMailbox texture_mailbox;
 665   scoped_ptr<cc::SingleReleaseCallback> release_callback;
 666   result->TakeTexture(&texture_mailbox, &release_callback);
 667   DCHECK(texture_mailbox.IsTexture());
 668   if (!texture_mailbox.IsTexture())
 669     return;
 670
 671   gfx::Rect result_rect(result->size());
 672
 673   content::ReadbackYUVInterface* yuv_readback_pipeline =
 674       dfh->yuv_readback_pipeline_.get();
 675   if (yuv_readback_pipeline == NULL ||
 676       yuv_readback_pipeline->scaler()->SrcSize() != result_rect.size() ||
 677       yuv_readback_pipeline->scaler()->SrcSubrect() != result_rect ||
 678       yuv_readback_pipeline->scaler()->DstSize() != region_in_frame.size()) {
 679     GLHelper::ScalerQuality quality = GLHelper::SCALER_QUALITY_FAST;
 680     std::string quality_switch = switches::kTabCaptureDownscaleQuality;
 681     // If we're scaling up, we can use the "best" quality.
 682     if (result_rect.size().width() < region_in_frame.size().width() &&
 683         result_rect.size().height() < region_in_frame.size().height())
 684       quality_switch = switches::kTabCaptureUpscaleQuality;
 685
 686     std::string switch_value =
 687         CommandLine::ForCurrentProcess()->GetSwitchValueASCII(quality_switch);
 688     if (switch_value == "fast")
 689       quality = GLHelper::SCALER_QUALITY_FAST;
 690     else if (switch_value == "good")
 691       quality = GLHelper::SCALER_QUALITY_GOOD;
 692     else if (switch_value == "best")
 693       quality = GLHelper::SCALER_QUALITY_BEST;
 694
 695     dfh->yuv_readback_pipeline_.reset(
 696         gl_helper->CreateReadbackPipelineYUV(quality,
 697                                              result_rect.size(),
 698                                              result_rect,
 699                                              video_frame->coded_size(),
 700                                              region_in_frame,
 701                                              true,
 702                                              true));
 703     yuv_readback_pipeline = dfh->yuv_readback_pipeline_.get();
 704   }
 705
 706   ignore_result(scoped_callback_runner.Release());
 707   ignore_result(scoped_return_subscriber_texture.Release());
 708   base::Callback<void(bool result)> finished_callback = base::Bind(
 709       &DelegatedFrameHost::CopyFromCompositingSurfaceFinishedForVideo,
 710       dfh->AsWeakPtr(),
 711       callback,
 712       subscriber_texture,
 713       base::Passed(&release_callback));
 714   yuv_readback_pipeline->ReadbackYUV(texture_mailbox.mailbox(),
 715                                      texture_mailbox.sync_point(),
 716                                      video_frame.get(),
 717                                      finished_callback);
 718 }
 719
 720 ////////////////////////////////////////////////////////////////////////////////
 721 // DelegatedFrameHost, ui::CompositorObserver implementation:
 722
 723 void DelegatedFrameHost::OnCompositingDidCommit(
 724     ui::Compositor* compositor) {
 725   RenderWidgetHostImpl* host = client_->GetHost();
 726   if (can_lock_compositor_ == NO_PENDING_COMMIT) {
 727     can_lock_compositor_ = YES;
 728     if (resize_lock_.get() && resize_lock_->GrabDeferredLock())
 729       can_lock_compositor_ = YES_DID_LOCK;
 730   }
 731   RunOnCommitCallbacks();
 732   if (resize_lock_ &&
 733       resize_lock_->expected_size() == current_frame_size_in_dip_) {
 734     resize_lock_.reset();
 735     host->WasResized();
 736     // We may have had a resize while we had the lock (e.g. if the lock expired,
 737     // or if the UI still gave us some resizes), so make sure we grab a new lock
 738     // if necessary.
 739     MaybeCreateResizeLock();
 740   }
 741 }
 742
 743 void DelegatedFrameHost::OnCompositingStarted(
 744     ui::Compositor* compositor, base::TimeTicks start_time) {
 745   last_draw_ended_ = start_time;
 746 }
 747
 748 void DelegatedFrameHost::OnCompositingEnded(
 749     ui::Compositor* compositor) {
 750 }
 751
 752 void DelegatedFrameHost::OnCompositingAborted(
 753     ui::Compositor* compositor) {
 754 }
 755
 756 void DelegatedFrameHost::OnCompositingLockStateChanged(
 757     ui::Compositor* compositor) {
 758   // A compositor lock that is part of a resize lock timed out. We
 759   // should display a renderer frame.
 760   if (!compositor->IsLocked() && can_lock_compositor_ == YES_DID_LOCK) {
 761     can_lock_compositor_ = NO_PENDING_RENDERER_FRAME;
 762   }
 763 }
 764
 765 void DelegatedFrameHost::OnUpdateVSyncParameters(
 766     base::TimeTicks timebase,
 767     base::TimeDelta interval) {
 768   RenderWidgetHostImpl* host = client_->GetHost();
 769   if (client_->IsVisible())
 770     host->UpdateVSyncParameters(timebase, interval);
 771 }
 772
 773 ////////////////////////////////////////////////////////////////////////////////
 774 // RenderWidgetHostViewAura, ImageTransportFactoryObserver implementation:
 775
 776 void DelegatedFrameHost::OnLostResources() {
 777   RenderWidgetHostImpl* host = client_->GetHost();
 778   if (frame_provider_.get())
 779     EvictDelegatedFrame();
 780   idle_frame_subscriber_textures_.clear();
 781   yuv_readback_pipeline_.reset();
 782
 783   host->ScheduleComposite();
 784 }
 785
 786 ////////////////////////////////////////////////////////////////////////////////
 787 // DelegatedFrameHost, private:
 788
 789 DelegatedFrameHost::~DelegatedFrameHost() {
 790   ImageTransportFactory::GetInstance()->RemoveObserver(this);
 791
 792   if (resource_collection_.get())
 793     resource_collection_->SetClient(NULL);
 794
 795   // An OwnedMailbox should not refer to the GLHelper anymore once the DFH is
 796   // destroyed, as it may then outlive the GLHelper.
 797   for (std::set<OwnedMailbox*>::iterator it =
 798            active_frame_subscriber_textures_.begin();
 799        it != active_frame_subscriber_textures_.end();
 800        ++it) {
 801     (*it)->Destroy();
 802   }
 803   active_frame_subscriber_textures_.clear();
 804   DCHECK(!vsync_manager_);
 805 }
 806
 807 void DelegatedFrameHost::RunOnCommitCallbacks() {
 808   for (std::vector<base::Closure>::const_iterator
 809       it = on_compositing_did_commit_callbacks_.begin();
 810       it != on_compositing_did_commit_callbacks_.end(); ++it) {
 811     it->Run();
 812   }
 813   on_compositing_did_commit_callbacks_.clear();
 814 }
 815
 816 void DelegatedFrameHost::AddOnCommitCallbackAndDisableLocks(
 817     const base::Closure& callback) {
 818   ui::Compositor* compositor = client_->GetCompositor();
 819   DCHECK(compositor);
 820
 821   if (!compositor->HasObserver(this))
 822     compositor->AddObserver(this);
 823
 824   can_lock_compositor_ = NO_PENDING_COMMIT;
 825   on_compositing_did_commit_callbacks_.push_back(callback);
 826 }
 827
 828 void DelegatedFrameHost::AddedToWindow() {
 829   ui::Compositor* compositor = client_->GetCompositor();
 830   if (compositor) {
 831     DCHECK(!vsync_manager_);
 832     vsync_manager_ = compositor->vsync_manager();
 833     vsync_manager_->AddObserver(this);
 834   }
 835 }
 836
 837 void DelegatedFrameHost::RemovingFromWindow() {
 838   RunOnCommitCallbacks();
 839   resize_lock_.reset();
 840   client_->GetHost()->WasResized();
 841   ui::Compositor* compositor = client_->GetCompositor();
 842   if (compositor && compositor->HasObserver(this))
 843     compositor->RemoveObserver(this);
 844
 845   if (vsync_manager_) {
 846     vsync_manager_->RemoveObserver(this);
 847     vsync_manager_ = NULL;
 848   }
 849 }
 850
 851 void DelegatedFrameHost::LockResources() {
 852   DCHECK(frame_provider_);
 853   delegated_frame_evictor_->LockFrame();
 854 }
 855
 856 void DelegatedFrameHost::UnlockResources() {
 857   DCHECK(frame_provider_);
 858   delegated_frame_evictor_->UnlockFrame();
 859 }
 860
 861 ////////////////////////////////////////////////////////////////////////////////
 862 // DelegatedFrameHost, ui::LayerOwnerDelegate implementation:
 863
 864 void DelegatedFrameHost::OnLayerRecreated(ui::Layer* old_layer,
 865                                                 ui::Layer* new_layer) {
 866   // The new_layer is the one that will be used by our Window, so that's the one
 867   // that should keep our frame. old_layer will be returned to the
 868   // RecreateLayer caller, and should have a copy.
 869   if (frame_provider_.get()) {
 870     new_layer->SetShowDelegatedContent(frame_provider_.get(),
 871                                        current_frame_size_in_dip_);
 872   }
 873 }
 874
 875 }  // namespace content
 876