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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 UI_DISPLAY_MAC_CA_DISPLAY_LINK_MAC_H_
#define UI_DISPLAY_MAC_CA_DISPLAY_LINK_MAC_H_
#import <CoreGraphics/CGDirectDisplay.h>
#include <set>
#include "base/functional/callback.h"
#include "base/time/time.h"
#include "ui/display/mac/display_link_mac.h"
namespace ui {
struct ObjCState;
class CADisplayLinkMac : public DisplayLinkMac {
public:
// Create a CADisplayLinkMac for the specified display.
static scoped_refptr<DisplayLinkMac> GetForDisplayOnCurrentThread(
CGDirectDisplayID display_id);
// DisplayLinkMac implementation
std::unique_ptr<VSyncCallbackMac> RegisterCallback(
VSyncCallbackMac::Callback callback) override;
double GetRefreshRate() const override;
void GetRefreshIntervalRange(base::TimeDelta& min_interval,
base::TimeDelta& max_interval,
base::TimeDelta& granularity) const override;
void SetPreferredInterval(base::TimeDelta interval) override;
// Use the same minimum, maximum and preferred frame rate for the fixed frame
// rate rerquest. If different minimum and maximum frame rates are set, the
// actual callback rate will be dynamically adjusted to better align with
// other animation sources.
void SetPreferredIntervalRange(base::TimeDelta min_interval,
base::TimeDelta max_interval,
base::TimeDelta preferred_interval) override;
base::TimeTicks GetCurrentTime() const override;
private:
explicit CADisplayLinkMac(CGDirectDisplayID display_id);
~CADisplayLinkMac() override;
CADisplayLinkMac(const CADisplayLinkMac&) = delete;
CADisplayLinkMac& operator=(const CADisplayLinkMac&) = delete;
// This is called by VSyncCallbackMac's destructor.
void UnregisterCallback(VSyncCallbackMac* callback);
// Return a nearest refresh interval that is supported by CADisplaylink.
base::TimeDelta AdjustedToSupportedInterval(base::TimeDelta interval);
// CADisplayLink callback from ObjCState.display_link.
void Step();
const CGDirectDisplayID display_id_;
std::unique_ptr<ObjCState> objc_state_;
// The system can change the available range of frame rates because it factors
// in system policies and a person’s preferences. For example, Low Power Mode,
// critical thermal state, and accessibility settings can affect the system’s
// frame rate. The system typically provides a consistent frame rate by
// choosing one that’s a factor of the display’s maximum refresh rate.
// The current frame interval range set in CADisplayLink
// preferredFrameRateRange.
base::TimeDelta preferred_interval_;
base::TimeDelta max_interval_;
base::TimeDelta min_interval_;
base::WeakPtr<VSyncCallbackMac> vsync_callback_;
// The number of consecutive DisplayLink VSyncs received after zero
// |callbacks_|. DisplayLink will be stopped after |kMaxExtraVSyncs| is
// reached.
int consecutive_vsyncs_with_no_callbacks_ = 0;
base::WeakPtrFactory<CADisplayLinkMac> weak_factory_{this};
};
} // namespace ui
#endif // UI_DISPLAY_MAC_CA_DISPLAY_LINK_MAC_H_
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