cc/vsync_time_source.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/vsync_time_source.h"
   6
   7 namespace cc {
   8
   9 scoped_refptr<VSyncTimeSource> VSyncTimeSource::create(
  10     VSyncProvider* vsync_provider) {
  11   return make_scoped_refptr(new VSyncTimeSource(vsync_provider));
  12 }
  13
  14 VSyncTimeSource::VSyncTimeSource(VSyncProvider* vsync_provider)
  15   : vsync_provider_(vsync_provider)
  16   , client_(0)
  17   , active_(false)
  18   , notification_requested_(false) {}
  19
  20 VSyncTimeSource::~VSyncTimeSource() {}
  21
  22 void VSyncTimeSource::setClient(TimeSourceClient* client) {
  23   client_ = client;
  24 }
  25
  26 void VSyncTimeSource::setActive(bool active) {
  27   if (active_ == active)
  28     return;
  29   active_ = active;
  30   // The notification will be lazily disabled in the callback to ensure
  31   // we get notified of the frame immediately following a quick on-off-on
  32   // transition.
  33   if (active_ && !notification_requested_) {
  34     notification_requested_ = true;
  35     vsync_provider_->RequestVSyncNotification(this);
  36   }
  37 }
  38
  39 bool VSyncTimeSource::active() const {
  40   return active_;
  41 }
  42
  43 base::TimeTicks VSyncTimeSource::lastTickTime() {
  44   return last_tick_time_;
  45 }
  46
  47 base::TimeTicks VSyncTimeSource::nextTickTime() {
  48   return active() ? last_tick_time_ + interval_ : base::TimeTicks();
  49 }
  50
  51 void VSyncTimeSource::setTimebaseAndInterval(base::TimeTicks,
  52                                              base::TimeDelta interval) {
  53   interval_ = interval;
  54 }
  55
  56 void VSyncTimeSource::DidVSync(base::TimeTicks frame_time) {
  57   last_tick_time_ = frame_time;
  58   if (!active_) {
  59     if (notification_requested_) {
  60       notification_requested_ = false;
  61       vsync_provider_->RequestVSyncNotification(NULL);
  62     }
  63     return;
  64   }
  65   if (client_)
  66     client_->onTimerTick();
  67 }
  68
  69 }  // namespace cc