src/content/browser/compositor/onscreen_display_client.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/onscreen_display_client.h"
   6
   7 #include "base/debug/trace_event.h"
   8 #include "cc/output/output_surface.h"
   9 #include "cc/surfaces/surface_factory.h"
  10 #include "cc/surfaces/surface_manager.h"
  11 #include "content/browser/compositor/surface_display_output_surface.h"
  12 #include "content/common/host_shared_bitmap_manager.h"
  13
  14 namespace content {
  15
  16 OnscreenDisplayClient::OnscreenDisplayClient(
  17     scoped_ptr<cc::OutputSurface> output_surface,
  18     cc::SurfaceManager* manager,
  19     scoped_refptr<base::SingleThreadTaskRunner> task_runner)
  20     : output_surface_(output_surface.Pass()),
  21       display_(
  22           new cc::Display(this, manager, HostSharedBitmapManager::current())),
  23       task_runner_(task_runner),
  24       scheduled_draw_(false),
  25       deferred_draw_(false),
  26       pending_frames_(0),
  27       weak_ptr_factory_(this) {
  28 }
  29
  30 OnscreenDisplayClient::~OnscreenDisplayClient() {
  31 }
  32
  33 scoped_ptr<cc::OutputSurface> OnscreenDisplayClient::CreateOutputSurface() {
  34   DCHECK(output_surface_.get());
  35   return output_surface_.Pass();
  36 }
  37
  38 void OnscreenDisplayClient::CommitVSyncParameters(base::TimeTicks timebase,
  39                                                   base::TimeDelta interval) {
  40   surface_display_output_surface_->ReceivedVSyncParameters(timebase, interval);
  41 }
  42
  43 void OnscreenDisplayClient::DisplayDamaged() {
  44   if (scheduled_draw_ || deferred_draw_)
  45     return;
  46   TRACE_EVENT0("content", "OnscreenDisplayClient::DisplayDamaged");
  47   if (pending_frames_ >= display_->GetMaxFramesPending()) {
  48     deferred_draw_ = true;
  49   } else {
  50     ScheduleDraw();
  51   }
  52 }
  53
  54 void OnscreenDisplayClient::ScheduleDraw() {
  55   DCHECK(!deferred_draw_);
  56   DCHECK(!scheduled_draw_);
  57   scheduled_draw_ = true;
  58   task_runner_->PostTask(
  59       FROM_HERE,
  60       base::Bind(&OnscreenDisplayClient::Draw, weak_ptr_factory_.GetWeakPtr()));
  61 }
  62
  63 void OnscreenDisplayClient::Draw() {
  64   TRACE_EVENT0("content", "OnscreenDisplayClient::Draw");
  65   scheduled_draw_ = false;
  66   display_->Draw();
  67 }
  68
  69 void OnscreenDisplayClient::DidSwapBuffers() {
  70   pending_frames_++;
  71 }
  72
  73 void OnscreenDisplayClient::DidSwapBuffersComplete() {
  74   pending_frames_--;
  75   if ((pending_frames_ < display_->GetMaxFramesPending()) && deferred_draw_) {
  76     deferred_draw_ = false;
  77     ScheduleDraw();
  78   }
  79 }
  80
  81 }  // namespace content