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 "base/logging.h"
   8 #include "base/sys_info.h"
   9
  10 namespace content {
  11
  12 RendererFrameManager* RendererFrameManager::GetInstance() {
  13   return Singleton<RendererFrameManager>::get();
  14 }
  15
  16 void RendererFrameManager::AddFrame(RendererFrameManagerClient* frame,
  17                                     bool visible) {
  18   RemoveFrame(frame);
  19   if (visible)
  20     visible_frames_.insert(frame);
  21   else
  22     hidden_frames_.push_front(frame);
  23   CullHiddenFrames();
  24 }
  25
  26 void RendererFrameManager::RemoveFrame(RendererFrameManagerClient* frame) {
  27   visible_frames_.erase(frame);
  28   hidden_frames_.remove(frame);
  29 }
  30
  31 void RendererFrameManager::SetFrameVisibility(RendererFrameManagerClient* frame,
  32                                               bool visible) {
  33   if (visible) {
  34     hidden_frames_.remove(frame);
  35     visible_frames_.insert(frame);
  36   } else {
  37     visible_frames_.erase(frame);
  38     hidden_frames_.push_front(frame);
  39     CullHiddenFrames();
  40   }
  41 }
  42
  43 RendererFrameManager::RendererFrameManager()
  44     : max_number_of_saved_frames_(
  45           std::min(5, 2 + (base::SysInfo::AmountOfPhysicalMemoryMB() / 256))) {}
  46
  47 RendererFrameManager::~RendererFrameManager() {}
  48
  49 void RendererFrameManager::CullHiddenFrames() {
  50   while (!hidden_frames_.empty() &&
  51          hidden_frames_.size() + visible_frames_.size() >
  52              max_number_of_saved_frames()) {
  53     size_t old_size = hidden_frames_.size();
  54     // Should remove self from list.
  55     hidden_frames_.back()->EvictCurrentFrame();
  56     DCHECK_EQ(hidden_frames_.size() + 1, old_size);
  57   }
  58 }
  59
  60 }  // namespace content