cc/scheduler/rate_limiter.cc

   1 // Copyright 2011 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/scheduler/rate_limiter.h"
   6
   7 #include "base/bind.h"
   8 #include "base/debug/trace_event.h"
   9 #include "base/location.h"
  10 #include "base/logging.h"
  11 #include "base/single_thread_task_runner.h"
  12 #include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
  13
  14 namespace cc {
  15
  16 scoped_refptr<RateLimiter> RateLimiter::Create(
  17     WebKit::WebGraphicsContext3D* context,
  18     RateLimiterClient* client,
  19     base::SingleThreadTaskRunner* task_runner) {
  20   return make_scoped_refptr(new RateLimiter(context, client, task_runner));
  21 }
  22
  23 RateLimiter::RateLimiter(WebKit::WebGraphicsContext3D* context,
  24                          RateLimiterClient* client,
  25                          base::SingleThreadTaskRunner* task_runner)
  26     : context_(context),
  27       active_(false),
  28       client_(client),
  29       task_runner_(task_runner) {
  30   DCHECK(context);
  31 }
  32
  33 RateLimiter::~RateLimiter() {}
  34
  35 void RateLimiter::Start() {
  36   if (active_)
  37     return;
  38
  39   TRACE_EVENT0("cc", "RateLimiter::Start");
  40   active_ = true;
  41   task_runner_->PostTask(FROM_HERE,
  42                          base::Bind(&RateLimiter::RateLimitContext, this));
  43 }
  44
  45 void RateLimiter::Stop() {
  46   TRACE_EVENT0("cc", "RateLimiter::Stop");
  47   client_ = NULL;
  48 }
  49
  50 void RateLimiter::RateLimitContext() {
  51   if (!client_)
  52     return;
  53
  54   TRACE_EVENT0("cc", "RateLimiter::RateLimitContext");
  55
  56   active_ = false;
  57   client_->RateLimit();
  58   context_->rateLimitOffscreenContextCHROMIUM();
  59 }
  60
  61 }  // namespace cc