src/content/browser/renderer_host/renderer_frame_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 "content/browser/renderer_host/renderer_frame_manager.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/logging.h"
  10 #include "base/sys_info.h"
  11
  12 namespace content {
  13
  14 RendererFrameManager* RendererFrameManager::GetInstance() {
  15   return Singleton<RendererFrameManager>::get();
  16 }
  17
  18 void RendererFrameManager::AddFrame(RendererFrameManagerClient* frame,
  19                                     bool locked) {
  20   RemoveFrame(frame);
  21   if (locked)
  22     locked_frames_[frame] = 1;
  23   else
  24     unlocked_frames_.push_front(frame);
  25   CullUnlockedFrames();
  26 }
  27
  28 void RendererFrameManager::RemoveFrame(RendererFrameManagerClient* frame) {
  29   std::map<RendererFrameManagerClient*, size_t>::iterator locked_iter =
  30       locked_frames_.find(frame);
  31   if (locked_iter != locked_frames_.end())
  32     locked_frames_.erase(locked_iter);
  33   unlocked_frames_.remove(frame);
  34 }
  35
  36 void RendererFrameManager::LockFrame(RendererFrameManagerClient* frame) {
  37   std::list<RendererFrameManagerClient*>::iterator unlocked_iter =
  38     std::find(unlocked_frames_.begin(), unlocked_frames_.end(), frame);
  39   if (unlocked_iter != unlocked_frames_.end()) {
  40     DCHECK(locked_frames_.find(frame) == locked_frames_.end());
  41     unlocked_frames_.remove(frame);
  42     locked_frames_[frame] = 1;
  43   } else {
  44     DCHECK(locked_frames_.find(frame) != locked_frames_.end());
  45     locked_frames_[frame]++;
  46   }
  47 }
  48
  49 void RendererFrameManager::UnlockFrame(RendererFrameManagerClient* frame) {
  50   DCHECK(locked_frames_.find(frame) != locked_frames_.end());
  51   size_t locked_count = locked_frames_[frame];
  52   DCHECK(locked_count);
  53   if (locked_count > 1) {
  54     locked_frames_[frame]--;
  55   } else {
  56     RemoveFrame(frame);
  57     unlocked_frames_.push_front(frame);
  58     CullUnlockedFrames();
  59   }
  60 }
  61
  62 RendererFrameManager::RendererFrameManager() {
  63   max_number_of_saved_frames_ =
  64 #if defined(OS_ANDROID)
  65       1;
  66 #else
  67       std::min(5, 2 + (base::SysInfo::AmountOfPhysicalMemoryMB() / 256));
  68 #endif
  69 }
  70
  71 RendererFrameManager::~RendererFrameManager() {}
  72
  73 void RendererFrameManager::CullUnlockedFrames() {
  74   while (!unlocked_frames_.empty() &&
  75          unlocked_frames_.size() + locked_frames_.size() >
  76              max_number_of_saved_frames()) {
  77     size_t old_size = unlocked_frames_.size();
  78     // Should remove self from list.
  79     unlocked_frames_.back()->EvictCurrentFrame();
  80     DCHECK_EQ(unlocked_frames_.size() + 1, old_size);
  81   }
  82 }
  83
  84 }  // namespace content