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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_WEB_CONTENTS_SLOW_WEB_PREFERENCE_CACHE_H_
#define CONTENT_BROWSER_WEB_CONTENTS_SLOW_WEB_PREFERENCE_CACHE_H_
#include "base/no_destructor.h"
#include "base/observer_list.h"
#include "base/scoped_observation.h"
#include "base/sequence_checker.h"
#include "content/common/content_export.h"
#include "third_party/blink/public/common/web_preferences/web_preferences.h"
#include "ui/events/devices/input_device_event_observer.h"
#include "ui/gl/gpu_switching_manager.h"
#include "ui/gl/gpu_switching_observer.h"
namespace content {
class CONTENT_EXPORT SlowWebPreferenceCacheObserver
: public base::CheckedObserver {
public:
virtual void OnSlowWebPreferenceChanged() {}
~SlowWebPreferenceCacheObserver() override;
};
// This is the cache of "slow" attributes (hardware configurations/things that
// require slow platform/device polling) of WebPreferences which normally won't
// get recomputed after the first time we set it , as opposed to "fast"
// attributes (which always gets recomputed). This cache is shared globally
// among multiple WebContents.
//
// Each WebContents monitors the change on slow attributes via
// SlowWebPreferenceCacheObserver.
//
// This is not thread safe. This is expected to be accessed on the main thread.
class CONTENT_EXPORT SlowWebPreferenceCache
: public ui::InputDeviceEventObserver,
public ui::GpuSwitchingObserver {
public:
SlowWebPreferenceCache(const SlowWebPreferenceCache&) = delete;
SlowWebPreferenceCache& operator=(const SlowWebPreferenceCache&) = delete;
static SlowWebPreferenceCache* GetInstance();
void AddObserver(SlowWebPreferenceCacheObserver* observer);
void RemoveObserver(SlowWebPreferenceCacheObserver* observer);
void Load(blink::web_pref::WebPreferences* prefs);
// InputDeviceEventObserver implementation
void OnInputDeviceConfigurationChanged(uint8_t) override;
// GpuSwitchingObserver implementation
void OnGpuSwitched(gl::GpuPreference) override;
private:
friend base::NoDestructor<SlowWebPreferenceCache>;
SlowWebPreferenceCache();
~SlowWebPreferenceCache() override;
// Updates the all slow attributes and returns whether any attribute is
// changed or not.
bool Update();
// Wrapper for ui::GetAvailablePointerAndHoverTypes which temporarily allows
// blocking calls required on Windows when running on touch enabled devices.
static std::pair<int, int> GetAvailablePointerAndHoverTypes();
bool is_initialized_ = false;
base::ObserverList<SlowWebPreferenceCacheObserver> observers_;
base::ScopedObservation<ui::GpuSwitchingManager, ui::GpuSwitchingObserver>
gpu_switch_observation_{this};
bool touch_event_feature_detection_enabled_ = false;
int available_pointer_types_ = 0;
int available_hover_types_ = 0;
blink::mojom::PointerType primary_pointer_type_ =
blink::mojom::PointerType::kPointerNone;
blink::mojom::HoverType primary_hover_type_ =
blink::mojom::HoverType::kHoverNone;
int pointer_events_max_touch_points_ = 0;
int number_of_cpu_cores_ = 1;
#if BUILDFLAG(IS_ANDROID)
bool video_fullscreen_orientation_lock_enabled_ = false;
bool video_rotate_to_fullscreen_enabled_ = false;
#endif // BUILDFLAG(IS_ANDROID)
SEQUENCE_CHECKER(sequence_checker_);
};
} // namespace content
#endif // CONTENT_BROWSER_WEB_CONTENTS_SLOW_WEB_PREFERENCE_CACHE_H_
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