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