| // Copyright 2014 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. |
| |
| #ifndef UI_ACCELERATED_WIDGET_MAC_DISPLAY_LINK_MAC_H_ |
| #define UI_ACCELERATED_WIDGET_MAC_DISPLAY_LINK_MAC_H_ |
| |
| #include <QuartzCore/CVDisplayLink.h> |
| |
| #include <map> |
| |
| #include "base/mac/scoped_typeref.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/time/time.h" |
| #include "ui/accelerated_widget_mac/accelerated_widget_mac_export.h" |
| |
| namespace ui { |
| |
| class ACCELERATED_WIDGET_MAC_EXPORT DisplayLinkMac |
| : public base::RefCountedThreadSafe<DisplayLinkMac> { |
| public: |
| // This must only be called from the main thread. |
| static scoped_refptr<DisplayLinkMac> GetForDisplay( |
| CGDirectDisplayID display_id); |
| |
| // Get vsync scheduling parameters. Returns false if the populated parameters |
| // are invalid. |
| bool GetVSyncParameters( |
| base::TimeTicks* timebase, |
| base::TimeDelta* interval); |
| |
| private: |
| friend class base::RefCountedThreadSafe<DisplayLinkMac>; |
| |
| DisplayLinkMac( |
| CGDirectDisplayID display_id, |
| base::ScopedTypeRef<CVDisplayLinkRef> display_link); |
| virtual ~DisplayLinkMac(); |
| |
| void StartOrContinueDisplayLink(); |
| void StopDisplayLink(); |
| |
| // Looks up the display and calls UpdateVSyncParameters() on the corresponding |
| // DisplayLinkMac. |
| static void DoUpdateVSyncParameters(CGDirectDisplayID display, |
| const CVTimeStamp& time); |
| |
| // Processes the display link callback. |
| void UpdateVSyncParameters(const CVTimeStamp& time); |
| |
| // Called by the system on the display link thread, and posts a call to |
| // DoUpdateVSyncParameters() to the UI thread. |
| static CVReturn DisplayLinkCallback( |
| CVDisplayLinkRef display_link, |
| const CVTimeStamp* now, |
| const CVTimeStamp* output_time, |
| CVOptionFlags flags_in, |
| CVOptionFlags* flags_out, |
| void* context); |
| |
| // This is called whenever the display is reconfigured, and marks that the |
| // vsync parameters must be recalculated. |
| static void DisplayReconfigurationCallBack( |
| CGDirectDisplayID display, |
| CGDisplayChangeSummaryFlags flags, |
| void* user_info); |
| |
| // The display that this display link is attached to. |
| CGDirectDisplayID display_id_; |
| |
| // CVDisplayLink for querying VSync timing info. |
| base::ScopedTypeRef<CVDisplayLinkRef> display_link_; |
| |
| // VSync parameters computed during UpdateVSyncParameters(). |
| bool timebase_and_interval_valid_ = false; |
| base::TimeTicks timebase_; |
| base::TimeDelta interval_; |
| |
| // The time after which we should re-start the display link to get fresh |
| // parameters. |
| base::TimeTicks recalculate_time_; |
| }; |
| |
| } // ui |
| |
| #endif // UI_ACCELERATED_WIDGET_MAC_DISPLAY_LINK_MAC_H_ |