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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/frame_memory_manager.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "base/memory/singleton.h" | |
9 #include "base/sys_info.h" | |
10 | |
11 namespace content { | |
12 | |
13 namespace { | |
14 | |
15 size_t MaxNumberOfSavedFrames() { | |
16 return std::min(5, 2 + (base::SysInfo::AmountOfPhysicalMemoryMB() / 256)); | |
17 } | |
18 | |
19 } // namespace | |
20 | |
21 FrameMemoryManager* FrameMemoryManager::GetInstance() { | |
22 return Singleton<FrameMemoryManager>::get(); | |
23 } | |
24 | |
25 void FrameMemoryManager::AddFrame(FrameContainer* frame, bool visible) { | |
26 RemoveFrame(frame); | |
27 if (visible) | |
28 visible_frames_.insert(frame); | |
29 else | |
30 hidden_frames_.push_front(frame); | |
31 CullHiddenFrames(); | |
32 } | |
33 | |
34 void FrameMemoryManager::RemoveFrame(FrameContainer* frame) { | |
35 visible_frames_.erase(frame); | |
36 hidden_frames_.remove(frame); | |
37 } | |
38 | |
39 void FrameMemoryManager::SetFrameVisibility(FrameContainer* frame, | |
40 bool visible) { | |
41 if (visible) { | |
42 hidden_frames_.remove(frame); | |
43 visible_frames_.insert(frame); | |
44 } else { | |
45 visible_frames_.erase(frame); | |
46 hidden_frames_.push_front(frame); | |
47 CullHiddenFrames(); | |
48 } | |
49 } | |
50 | |
51 FrameMemoryManager::FrameMemoryManager() {} | |
52 | |
53 FrameMemoryManager::~FrameMemoryManager() {} | |
54 | |
55 void FrameMemoryManager::CullHiddenFrames() { | |
56 while (!hidden_frames_.empty() && | |
57 hidden_frames_.size() + visible_frames_.size() > | |
58 MaxNumberOfSavedFrames()) { | |
59 size_t old_size = hidden_frames_.size(); | |
60 // Should remove self from list. | |
61 hidden_frames_.back()->ReleaseCurrentFrame(); | |
62 DCHECK_EQ(hidden_frames_.size() + 1, old_size); | |
63 } | |
64 } | |
65 | |
66 } // namespace content | |
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