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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/frame_memory_manager.h"
#include "base/logging.h"
#include "base/memory/singleton.h"
#include "base/sys_info.h"
namespace content {
namespace {
size_t MaxNumberOfSavedFrames() {
return std::min(5, 2 + (base::SysInfo::AmountOfPhysicalMemoryMB() / 256));
}
} // namespace
FrameMemoryManager* FrameMemoryManager::GetInstance() {
return Singleton<FrameMemoryManager>::get();
}
void FrameMemoryManager::AddFrame(FrameContainer* frame, bool visible) {
RemoveFrame(frame);
if (visible)
visible_frames_.insert(frame);
else
hidden_frames_.push_front(frame);
CullHiddenFrames();
}
void FrameMemoryManager::RemoveFrame(FrameContainer* frame) {
visible_frames_.erase(frame);
hidden_frames_.remove(frame);
}
void FrameMemoryManager::SetFrameVisibility(FrameContainer* frame,
bool visible) {
if (visible) {
hidden_frames_.remove(frame);
visible_frames_.insert(frame);
} else {
visible_frames_.erase(frame);
hidden_frames_.push_front(frame);
CullHiddenFrames();
}
}
FrameMemoryManager::FrameMemoryManager() {}
FrameMemoryManager::~FrameMemoryManager() {}
void FrameMemoryManager::CullHiddenFrames() {
while (!hidden_frames_.empty() &&
hidden_frames_.size() + visible_frames_.size() >
MaxNumberOfSavedFrames()) {
size_t old_size = hidden_frames_.size();
// Should remove self from list.
hidden_frames_.back()->ReleaseCurrentFrame();
DCHECK_EQ(hidden_frames_.size() + 1, old_size);
}
}
} // namespace content
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