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// Copyright (c) 2012 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 "chrome/browser/gpu/chrome_gpu_util.h"
#include "base/command_line.h"
#include "base/metrics/field_trial.h"
#include "base/metrics/histogram.h"
#include "base/version.h"
#if defined(OS_WIN)
#include "base/win/windows_version.h"
#endif
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/browser_list_observer.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/chrome_version_info.h"
#include "content/public/browser/gpu_data_manager.h"
#include "content/public/common/content_constants.h"
#include "content/public/common/content_switches.h"
using content::GpuDataManager;
namespace gpu_util {
// The BrowserMonitor class is used to track the number of currently open
// browser windows, so that the gpu can be notified when they are created or
// destroyed. We only count tabbed windows for this purpose.
// There's no BrowserList on Android/
#if !defined(OS_ANDROID)
class BrowserMonitor : public chrome::BrowserListObserver {
public:
static BrowserMonitor* GetInstance() {
static BrowserMonitor* instance = NULL;
if (!instance)
instance = new BrowserMonitor;
return instance;
}
void Install() {
if (!installed_) {
BrowserList::AddObserver(this);
installed_ = true;
}
}
void Uninstall() {
if (installed_) {
BrowserList::RemoveObserver(this);
installed_ = false;
}
}
private:
BrowserMonitor() : num_browsers_(0), installed_(false) {
}
virtual ~BrowserMonitor() {
}
// BrowserListObserver implementation.
virtual void OnBrowserAdded(Browser* browser) OVERRIDE {
if (browser->type() == Browser::TYPE_TABBED)
content::GpuDataManager::GetInstance()->SetWindowCount(++num_browsers_);
}
virtual void OnBrowserRemoved(Browser* browser) OVERRIDE {
if (browser->type() == Browser::TYPE_TABBED)
content::GpuDataManager::GetInstance()->SetWindowCount(--num_browsers_);
}
uint32 num_browsers_;
bool installed_;
};
void InstallBrowserMonitor() {
BrowserMonitor::GetInstance()->Install();
}
void UninstallBrowserMonitor() {
BrowserMonitor::GetInstance()->Uninstall();
}
#endif // !defined(OS_ANDROID)
void DisableCompositingFieldTrial() {
base::FieldTrial* trial =
base::FieldTrialList::Find(content::kGpuCompositingFieldTrialName);
if (trial)
trial->Disable();
}
bool ShouldRunCompositingFieldTrial() {
// Enable the field trial only on desktop OS's.
#if !(defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX))
return false;
#endif
// Necessary for linux_chromeos build since it defines both OS_LINUX
// and OS_CHROMEOS.
#if defined(OS_CHROMEOS)
return false;
#endif
#if defined(OS_WIN)
// Don't run the trial on Windows XP.
if (base::win::GetVersion() < base::win::VERSION_VISTA)
return false;
#endif
// Don't activate the field trial if force-compositing-mode has been
// explicitly disabled from the command line.
if (CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableForceCompositingMode) ||
CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableAcceleratedCompositing))
return false;
return true;
}
// Note 1: The compositing field trial may be created at startup time via the
// Finch framework. In that case, all the Groups and probability values are
// set before this function is called and any Field Trial setup calls
// made here are simply ignored.
// Note 2: Compositing field trials will be overwritten if accelerated
// compositing is blacklisted. That check takes place in
// IsThreadedCompositingEnabled() and IsForceCompositingModeEnabled() as
// the blacklist information isn't available at the time the field trials
// are initialized.
// Early outs from this function intended to bypass activation of the field
// trial must call DisableCompositingFieldTrial() before returning.
void InitializeCompositingFieldTrial() {
// Early out in configurations that should not run the compositing
// field trial.
if (!ShouldRunCompositingFieldTrial()) {
DisableCompositingFieldTrial();
return;
}
const base::FieldTrial::Probability kDivisor = 3;
scoped_refptr<base::FieldTrial> trial(
base::FieldTrialList::FactoryGetFieldTrial(
content::kGpuCompositingFieldTrialName, kDivisor,
"disable", 2013, 12, 31, NULL));
// Produce the same result on every run of this client.
trial->UseOneTimeRandomization();
base::FieldTrial::Probability force_compositing_mode_probability = 0;
base::FieldTrial::Probability threaded_compositing_probability = 0;
// Note: Threaded compositing mode isn't feature complete on mac or linux yet:
// http://crbug.com/133602 for mac
// http://crbug.com/140866 for linux
#if defined(OS_WIN)
// Enable threaded compositing on Windows.
threaded_compositing_probability = kDivisor;
#elif defined(OS_MACOSX)
chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
if (channel == chrome::VersionInfo::CHANNEL_CANARY ||
channel == chrome::VersionInfo::CHANNEL_DEV) {
// Enable force-compositing-mode on the Mac.
force_compositing_mode_probability = kDivisor;
}
#endif
int force_compositing_group = trial->AppendGroup(
content::kGpuCompositingFieldTrialForceCompositingEnabledName,
force_compositing_mode_probability);
int thread_group = trial->AppendGroup(
content::kGpuCompositingFieldTrialThreadEnabledName,
threaded_compositing_probability);
bool force_compositing = (trial->group() == force_compositing_group);
bool thread = (trial->group() == thread_group);
UMA_HISTOGRAM_BOOLEAN("GPU.InForceCompositingModeFieldTrial",
force_compositing);
UMA_HISTOGRAM_BOOLEAN("GPU.InCompositorThreadFieldTrial", thread);
}
} // namespace gpu_util;
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