android_webview/browser/gl_view_renderer_manager.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 "android_webview/browser/gl_view_renderer_manager.h"
   6
   7 #include "base/logging.h"
   8 #include "base/threading/platform_thread.h"
   9
  10 namespace android_webview {
  11
  12 using base::AutoLock;
  13
  14 namespace {
  15 base::LazyInstance<GLViewRendererManager>::Leaky g_view_renderer_manager =
  16     LAZY_INSTANCE_INITIALIZER;
  17 }  // namespace
  18
  19 // static
  20 GLViewRendererManager* GLViewRendererManager::GetInstance() {
  21   return g_view_renderer_manager.Pointer();
  22 }
  23
  24 GLViewRendererManager::GLViewRendererManager() {}
  25
  26 GLViewRendererManager::~GLViewRendererManager() {}
  27
  28 bool GLViewRendererManager::OnRenderThread() const {
  29   AutoLock auto_lock(lock_);
  30   return render_thread_.is_equal(base::PlatformThread::CurrentHandle());
  31 }
  32
  33 void GLViewRendererManager::MarkRenderThread() {
  34   lock_.AssertAcquired();
  35   if (render_thread_.is_null())
  36     render_thread_ = base::PlatformThread::CurrentHandle();
  37   DCHECK(render_thread_.is_equal(base::PlatformThread::CurrentHandle()));
  38 }
  39
  40 GLViewRendererManager::Key GLViewRendererManager::DidDrawGL(Key key,
  41                                                             RendererType view) {
  42   AutoLock auto_lock(lock_);
  43   MarkRenderThread();
  44
  45   if (key == mru_list_.end()) {
  46     DCHECK(mru_list_.end() ==
  47            std::find(mru_list_.begin(), mru_list_.end(), view));
  48     mru_list_.push_front(view);
  49     return mru_list_.begin();
  50   } else {
  51     DCHECK(*key == view);
  52     mru_list_.splice(mru_list_.begin(), mru_list_, key);
  53     return key;
  54   }
  55 }
  56
  57 void GLViewRendererManager::NoLongerExpectsDrawGL(Key key) {
  58   AutoLock auto_lock(lock_);
  59   DCHECK(mru_list_.end() != key);
  60   mru_list_.erase(key);
  61 }
  62
  63 GLViewRendererManager::RendererType
  64 GLViewRendererManager::GetMostRecentlyDrawn() const {
  65   AutoLock auto_lock(lock_);
  66   if (mru_list_.begin() == mru_list_.end())
  67     return NULL;
  68   return *mru_list_.begin();
  69 }
  70
  71 GLViewRendererManager::Key GLViewRendererManager::NullKey() {
  72   AutoLock auto_lock(lock_);
  73   return mru_list_.end();
  74 }
  75
  76 }  // namespace android_webview