content/browser/android/in_process/synchronous_compositor_external_begin_frame_source.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/android/in_process/synchronous_compositor_external_begin_frame_source.h"
   6
   7 #include "cc/output/begin_frame_args.h"
   8 #include "content/browser/android/in_process/synchronous_compositor_impl.h"
   9 #include "content/browser/android/in_process/synchronous_compositor_registry.h"
  10 #include "content/public/browser/browser_thread.h"
  11
  12 namespace content {
  13
  14 SynchronousCompositorExternalBeginFrameSource::
  15     SynchronousCompositorExternalBeginFrameSource(int routing_id)
  16     : routing_id_(routing_id),
  17       registered_(false),
  18       compositor_(nullptr) {
  19 }
  20
  21 SynchronousCompositorExternalBeginFrameSource::
  22     ~SynchronousCompositorExternalBeginFrameSource() {
  23   DCHECK(CalledOnValidThread());
  24
  25   if (registered_) {
  26     SynchronousCompositorRegistry::GetInstance()->UnregisterBeginFrameSource(
  27         routing_id_, this);
  28   }
  29   DCHECK(!compositor_);
  30 }
  31
  32 void SynchronousCompositorExternalBeginFrameSource::BeginFrame(
  33     const cc::BeginFrameArgs& args) {
  34   DCHECK(CalledOnValidThread());
  35   CallOnBeginFrame(args);
  36 }
  37
  38 void SynchronousCompositorExternalBeginFrameSource::SetCompositor(
  39     SynchronousCompositorImpl* compositor) {
  40   DCHECK(CalledOnValidThread());
  41   if (compositor_ == compositor) return;
  42
  43   if (compositor_)
  44     compositor_->OnNeedsBeginFramesChange(false);
  45
  46   compositor_ = compositor;
  47
  48   if (compositor_)
  49     compositor_->OnNeedsBeginFramesChange(needs_begin_frames_);
  50 }
  51
  52 void SynchronousCompositorExternalBeginFrameSource::OnNeedsBeginFramesChange(
  53     bool needs_begin_frames) {
  54   DCHECK(CalledOnValidThread());
  55   if (compositor_)
  56     compositor_->OnNeedsBeginFramesChange(needs_begin_frames);
  57 }
  58
  59 void SynchronousCompositorExternalBeginFrameSource::SetClientReady() {
  60   DCHECK(CalledOnValidThread());
  61   SynchronousCompositorRegistry::GetInstance()->RegisterBeginFrameSource(
  62       routing_id_, this);
  63   registered_ = true;
  64 }
  65
  66 // Not using base::NonThreadSafe as we want to enforce a more exacting threading
  67 // requirement: SynchronousCompositorExternalBeginFrameSource() must only be
  68 // used on the UI thread.
  69 bool
  70 SynchronousCompositorExternalBeginFrameSource::CalledOnValidThread() const {
  71   return BrowserThread::CurrentlyOn(BrowserThread::UI);
  72 }
  73
  74 }  // namespace content