ronnie
2023-02-07 4382dc0b492f08fac9cc178333329b28204dfb09
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
package com.android.server.display;
 
import android.app.ActivityThread;
import android.content.Context;
import android.content.res.Resources;
import android.hardware.sidekick.SidekickInternal;
import android.os.Build;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.PowerManager;
import android.os.SystemProperties;
import android.os.Trace;
import android.util.LongSparseArray;
import android.util.Slog;
import android.util.SparseArray;
import android.view.Display;
import android.view.DisplayAddress;
import android.view.DisplayCutout;
import android.view.DisplayEventReceiver;
import android.view.Surface;
import android.view.SurfaceControl;
 
import com.android.server.LocalServices;
import com.android.server.lights.Light;
import com.android.server.lights.LightsManager;
 
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
 
/**
 * A display adapter for the local displays managed by Surface Flinger.
 * <p>
 * Display adapters are guarded by the {@link DisplayManagerService.SyncRoot} lock.
 * </p>
 */
final class LocalDisplayAdapter extends DisplayAdapter {
    private static final String TAG = "LocalDisplayAdapter";
    private static final boolean DEBUG = false;
 
    private static final String UNIQUE_ID_PREFIX = "local:";
 
    private static final String PROPERTY_EMULATOR_CIRCULAR = "ro.emulator.circular";
 
    private final LongSparseArray<LocalDisplayDevice> mDevices =
            new LongSparseArray<LocalDisplayDevice>();
 
    @SuppressWarnings("unused")  // Becomes active at instantiation time.
    private PhysicalDisplayEventReceiver mPhysicalDisplayEventReceiver;
 
 
    // Called with SyncRoot lock held.
    public LocalDisplayAdapter(DisplayManagerService.SyncRoot syncRoot,
            Context context, Handler handler, Listener listener) {
        super(syncRoot, context, handler, listener, TAG);
    }
 
    @Override
    public void registerLocked() {
        super.registerLocked();
 
        mPhysicalDisplayEventReceiver = new PhysicalDisplayEventReceiver(getHandler().getLooper());
 
        for (long physicalDisplayId : SurfaceControl.getPhysicalDisplayIds()) {
            tryConnectDisplayLocked(physicalDisplayId);
        }
    }
 
    private void tryConnectDisplayLocked(long physicalDisplayId) {
        final IBinder displayToken = SurfaceControl.getPhysicalDisplayToken(physicalDisplayId);
        if (displayToken != null) {
            SurfaceControl.PhysicalDisplayInfo[] configs =
                    SurfaceControl.getDisplayConfigs(displayToken);
            if (configs == null) {
                // There are no valid configs for this device, so we can't use it
                Slog.w(TAG, "No valid configs found for display device " + physicalDisplayId);
                return;
            }
            int activeConfig = SurfaceControl.getActiveConfig(displayToken);
            if (activeConfig < 0) {
                // There is no active config, and for now we don't have the
                // policy to set one.
                Slog.w(TAG, "No active config found for display device " + physicalDisplayId);
                return;
            }
            int activeColorMode = SurfaceControl.getActiveColorMode(displayToken);
            if (activeColorMode < 0) {
                // We failed to get the active color mode. We don't bail out here since on the next
                // configuration pass we'll go ahead and set it to whatever it was set to last (or
                // COLOR_MODE_NATIVE if this is the first configuration).
                Slog.w(TAG, "Unable to get active color mode for display device " +
                        physicalDisplayId);
                activeColorMode = Display.COLOR_MODE_INVALID;
            }
            int[] colorModes = SurfaceControl.getDisplayColorModes(displayToken);
            int[] allowedConfigs = SurfaceControl.getAllowedDisplayConfigs(displayToken);
            LocalDisplayDevice device = mDevices.get(physicalDisplayId);
            if (device == null) {
                // Display was added.
                final boolean isInternal = mDevices.size() == 0;
                device = new LocalDisplayDevice(displayToken, physicalDisplayId,
                        configs, activeConfig, allowedConfigs, colorModes, activeColorMode,
                        isInternal);
                mDevices.put(physicalDisplayId, device);
                sendDisplayDeviceEventLocked(device, DISPLAY_DEVICE_EVENT_ADDED);
            } else if (device.updatePhysicalDisplayInfoLocked(configs, activeConfig,
                        allowedConfigs, colorModes, activeColorMode)) {
                // Display properties changed.
                sendDisplayDeviceEventLocked(device, DISPLAY_DEVICE_EVENT_CHANGED);
            }
        } else {
            // The display is no longer available. Ignore the attempt to add it.
            // If it was connected but has already been disconnected, we'll get a
            // disconnect event that will remove it from mDevices.
        }
    }
 
    private void tryDisconnectDisplayLocked(long physicalDisplayId) {
        LocalDisplayDevice device = mDevices.get(physicalDisplayId);
        if (device != null) {
            // Display was removed.
            mDevices.remove(physicalDisplayId);
            sendDisplayDeviceEventLocked(device, DISPLAY_DEVICE_EVENT_REMOVED);
        }
    }
 
    static int getPowerModeForState(int state) {
        switch (state) {
            case Display.STATE_OFF:
                return SurfaceControl.POWER_MODE_OFF;
            case Display.STATE_DOZE:
                return SurfaceControl.POWER_MODE_DOZE;
            case Display.STATE_DOZE_SUSPEND:
                return SurfaceControl.POWER_MODE_DOZE_SUSPEND;
            case Display.STATE_ON_SUSPEND:
                return SurfaceControl.POWER_MODE_ON_SUSPEND;
            default:
                return SurfaceControl.POWER_MODE_NORMAL;
        }
    }
 
    private final class LocalDisplayDevice extends DisplayDevice {
        private final long mPhysicalDisplayId;
        private final Light mBacklight;
        private final SparseArray<DisplayModeRecord> mSupportedModes = new SparseArray<>();
        private final ArrayList<Integer> mSupportedColorModes = new ArrayList<>();
        private final boolean mIsInternal;
 
        private DisplayDeviceInfo mInfo;
        private boolean mHavePendingChanges;
        private int mState = Display.STATE_UNKNOWN;
        private int mBrightness = PowerManager.BRIGHTNESS_DEFAULT;
        private int mDefaultModeId;
        private int mActiveModeId;
        private boolean mActiveModeInvalid;
        private int[] mAllowedModeIds;
        private boolean mAllowedModeIdsInvalid;
        private int mActivePhysIndex;
        private int[] mAllowedPhysIndexes;
        private int mActiveColorMode;
        private boolean mActiveColorModeInvalid;
        private Display.HdrCapabilities mHdrCapabilities;
        private boolean mSidekickActive;
        private SidekickInternal mSidekickInternal;
 
        private SurfaceControl.PhysicalDisplayInfo[] mDisplayInfos;
 
        LocalDisplayDevice(IBinder displayToken, long physicalDisplayId,
                SurfaceControl.PhysicalDisplayInfo[] physicalDisplayInfos, int activeDisplayInfo,
                int[] allowedDisplayInfos, int[] colorModes, int activeColorMode,
                boolean isInternal) {
            super(LocalDisplayAdapter.this, displayToken, UNIQUE_ID_PREFIX + physicalDisplayId);
            mPhysicalDisplayId = physicalDisplayId;
            mIsInternal = isInternal;
            updatePhysicalDisplayInfoLocked(physicalDisplayInfos, activeDisplayInfo,
                    allowedDisplayInfos, colorModes, activeColorMode);
            updateColorModesLocked(colorModes, activeColorMode);
            mSidekickInternal = LocalServices.getService(SidekickInternal.class);
            if (mIsInternal) {
                LightsManager lights = LocalServices.getService(LightsManager.class);
                mBacklight = lights.getLight(LightsManager.LIGHT_ID_BACKLIGHT);
            } else {
                mBacklight = null;
            }
            mHdrCapabilities = SurfaceControl.getHdrCapabilities(displayToken);
        }
 
        @Override
        public boolean hasStableUniqueId() {
            return true;
        }
 
        public boolean updatePhysicalDisplayInfoLocked(
                SurfaceControl.PhysicalDisplayInfo[] physicalDisplayInfos, int activeDisplayInfo,
                int[] allowedDisplayInfos, int[] colorModes, int activeColorMode) {
            mDisplayInfos = Arrays.copyOf(physicalDisplayInfos, physicalDisplayInfos.length);
            mActivePhysIndex = activeDisplayInfo;
            mAllowedPhysIndexes = Arrays.copyOf(allowedDisplayInfos, allowedDisplayInfos.length);
            // Build an updated list of all existing modes.
            ArrayList<DisplayModeRecord> records = new ArrayList<DisplayModeRecord>();
            boolean modesAdded = false;
            for (int i = 0; i < physicalDisplayInfos.length; i++) {
                SurfaceControl.PhysicalDisplayInfo info = physicalDisplayInfos[i];
                // First, check to see if we've already added a matching mode. Since not all
                // configuration options are exposed via Display.Mode, it's possible that we have
                // multiple PhysicalDisplayInfos that would generate the same Display.Mode.
                boolean existingMode = false;
                for (int j = 0; j < records.size(); j++) {
                    if (records.get(j).hasMatchingMode(info)) {
                        existingMode = true;
                        break;
                    }
                }
                if (existingMode) {
                    continue;
                }
                // If we haven't already added a mode for this configuration to the new set of
                // supported modes then check to see if we have one in the prior set of supported
                // modes to reuse.
                DisplayModeRecord record = findDisplayModeRecord(info);
                if (record == null) {
                    record = new DisplayModeRecord(info);
                    modesAdded = true;
                }
                records.add(record);
            }
 
            // Get the currently active mode
            DisplayModeRecord activeRecord = null;
            for (int i = 0; i < records.size(); i++) {
                DisplayModeRecord record = records.get(i);
                if (record.hasMatchingMode(physicalDisplayInfos[activeDisplayInfo])){
                    activeRecord = record;
                    break;
                }
            }
 
            // Check whether surface flinger spontaneously changed modes out from under us.
            // Schedule traversals to ensure that the correct state is reapplied if necessary.
            if (mActiveModeId != 0
                    && mActiveModeId != activeRecord.mMode.getModeId()) {
                mActiveModeInvalid = true;
                sendTraversalRequestLocked();
            }
 
            boolean recordsChanged = records.size() != mSupportedModes.size() || modesAdded;
            // If the records haven't changed then we're done here.
            if (!recordsChanged) {
                return false;
            }
            // Update the index of modes.
            mHavePendingChanges = true;
 
            mSupportedModes.clear();
            for (DisplayModeRecord record : records) {
                mSupportedModes.put(record.mMode.getModeId(), record);
            }
 
            // Update the default mode, if needed.
            if (findDisplayInfoIndexLocked(mDefaultModeId) < 0) {
                if (mDefaultModeId != 0) {
                    Slog.w(TAG, "Default display mode no longer available, using currently"
                            + " active mode as default.");
                }
                mDefaultModeId = activeRecord.mMode.getModeId();
            }
 
            // Determine whether the active mode is still there.
            if (mSupportedModes.indexOfKey(mActiveModeId) < 0) {
                if (mActiveModeId != 0) {
                    Slog.w(TAG, "Active display mode no longer available, reverting to default"
                            + " mode.");
                }
                mActiveModeId = mDefaultModeId;
                mActiveModeInvalid = true;
            }
 
            // Determine what the currently allowed modes are
            mAllowedModeIds = new int[] { mActiveModeId };
            int[] allowedModeIds = new int[mAllowedPhysIndexes.length];
            int size = 0;
            for (int physIndex : mAllowedPhysIndexes) {
                int modeId = findMatchingModeIdLocked(physIndex);
                if (modeId > 0) {
                    allowedModeIds[size++] = modeId;
                }
            }
 
            // If this is different from our desired allowed modes, then mark our current set as
            // invalid so we correct this on the next traversal.
            mAllowedModeIdsInvalid = !Arrays.equals(allowedModeIds, mAllowedModeIds);
 
            // Schedule traversals so that we apply pending changes.
            sendTraversalRequestLocked();
            return true;
        }
 
        private boolean updateColorModesLocked(int[] colorModes,
                int activeColorMode) {
            List<Integer> pendingColorModes = new ArrayList<>();
 
            if (colorModes == null) return false;
            // Build an updated list of all existing color modes.
            boolean colorModesAdded = false;
            for (int colorMode: colorModes) {
                if (!mSupportedColorModes.contains(colorMode)) {
                    colorModesAdded = true;
                }
                pendingColorModes.add(colorMode);
            }
 
            boolean colorModesChanged =
                    pendingColorModes.size() != mSupportedColorModes.size()
                    || colorModesAdded;
 
            // If the supported color modes haven't changed then we're done here.
            if (!colorModesChanged) {
                return false;
            }
 
            mHavePendingChanges = true;
 
            mSupportedColorModes.clear();
            mSupportedColorModes.addAll(pendingColorModes);
            Collections.sort(mSupportedColorModes);
 
            // Determine whether the active color mode is still there.
            if (!mSupportedColorModes.contains(mActiveColorMode)) {
                if (mActiveColorMode != 0) {
                    Slog.w(TAG, "Active color mode no longer available, reverting"
                            + " to default mode.");
                    mActiveColorMode = Display.COLOR_MODE_DEFAULT;
                    mActiveColorModeInvalid = true;
                } else {
                    if (!mSupportedColorModes.isEmpty()) {
                        // This should never happen.
                        Slog.e(TAG, "Default and active color mode is no longer available!"
                                + " Reverting to first available mode.");
                        mActiveColorMode = mSupportedColorModes.get(0);
                        mActiveColorModeInvalid = true;
                    } else {
                        // This should really never happen.
                        Slog.e(TAG, "No color modes available!");
                    }
                }
            }
            return true;
        }
 
        private DisplayModeRecord findDisplayModeRecord(SurfaceControl.PhysicalDisplayInfo info) {
            for (int i = 0; i < mSupportedModes.size(); i++) {
                DisplayModeRecord record = mSupportedModes.valueAt(i);
                if (record.hasMatchingMode(info)) {
                    return record;
                }
            }
            return null;
        }
 
        @Override
        public void applyPendingDisplayDeviceInfoChangesLocked() {
            if (mHavePendingChanges) {
                mInfo = null;
                mHavePendingChanges = false;
            }
        }
 
        @Override
        public DisplayDeviceInfo getDisplayDeviceInfoLocked() {
            if (mInfo == null) {
                SurfaceControl.PhysicalDisplayInfo phys = mDisplayInfos[mActivePhysIndex];
                mInfo = new DisplayDeviceInfo();
                mInfo.width = phys.width;
                mInfo.height = phys.height;
                mInfo.modeId = mActiveModeId;
                mInfo.defaultModeId = mDefaultModeId;
                mInfo.supportedModes = getDisplayModes(mSupportedModes);
                mInfo.colorMode = mActiveColorMode;
                mInfo.supportedColorModes =
                        new int[mSupportedColorModes.size()];
                for (int i = 0; i < mSupportedColorModes.size(); i++) {
                    mInfo.supportedColorModes[i] = mSupportedColorModes.get(i);
                }
                mInfo.hdrCapabilities = mHdrCapabilities;
                mInfo.appVsyncOffsetNanos = phys.appVsyncOffsetNanos;
                mInfo.presentationDeadlineNanos = phys.presentationDeadlineNanos;
                mInfo.state = mState;
                mInfo.uniqueId = getUniqueId();
                final DisplayAddress.Physical physicalAddress =
                        DisplayAddress.fromPhysicalDisplayId(mPhysicalDisplayId);
                mInfo.address = physicalAddress;
 
                // Assume that all built-in displays that have secure output (eg. HDCP) also
                // support compositing from gralloc protected buffers.
                if (phys.secure) {
                    mInfo.flags = DisplayDeviceInfo.FLAG_SECURE
                            | DisplayDeviceInfo.FLAG_SUPPORTS_PROTECTED_BUFFERS;
                }
 
                final Resources res = getOverlayContext().getResources();
                if (mIsInternal) {
                    mInfo.name = res.getString(
                            com.android.internal.R.string.display_manager_built_in_display_name);
                    mInfo.flags |= DisplayDeviceInfo.FLAG_DEFAULT_DISPLAY
                            | DisplayDeviceInfo.FLAG_ROTATES_WITH_CONTENT;
                    if (res.getBoolean(com.android.internal.R.bool.config_mainBuiltInDisplayIsRound)
                            || (Build.IS_EMULATOR
                            && SystemProperties.getBoolean(PROPERTY_EMULATOR_CIRCULAR, false))) {
                        mInfo.flags |= DisplayDeviceInfo.FLAG_ROUND;
                    }
                    if (res.getBoolean(
                            com.android.internal.R.bool.config_maskMainBuiltInDisplayCutout)) {
                        mInfo.flags |= DisplayDeviceInfo.FLAG_MASK_DISPLAY_CUTOUT;
                    }
                    mInfo.displayCutout = DisplayCutout.fromResourcesRectApproximation(res,
                            mInfo.width, mInfo.height);
                    mInfo.type = Display.TYPE_BUILT_IN;
                    mInfo.densityDpi = (int)(phys.density * 160 + 0.5f);
                    mInfo.xDpi = phys.xDpi;
                    mInfo.yDpi = phys.yDpi;
                    mInfo.touch = DisplayDeviceInfo.TOUCH_INTERNAL;
                } else {
                    mInfo.displayCutout = null;
                    mInfo.type = Display.TYPE_HDMI;
                    mInfo.flags |= DisplayDeviceInfo.FLAG_PRESENTATION;
                    mInfo.name = getContext().getResources().getString(
                            com.android.internal.R.string.display_manager_hdmi_display_name);
                    mInfo.touch = DisplayDeviceInfo.TOUCH_EXTERNAL;
                    mInfo.setAssumedDensityForExternalDisplay(phys.width, phys.height);
 
                    // For demonstration purposes, allow rotation of the external display.
                    // In the future we might allow the user to configure this directly.
                    if ("portrait".equals(SystemProperties.get("persist.demo.hdmirotation"))) {
                        mInfo.rotation = Surface.ROTATION_270;
                    }
 
                    // For demonstration purposes, allow rotation of the external display
                    // to follow the built-in display.
                    if (SystemProperties.getBoolean("persist.demo.hdmirotates", false)) {
                        mInfo.flags |= DisplayDeviceInfo.FLAG_ROTATES_WITH_CONTENT;
                    }
 
                    if (!res.getBoolean(
                                com.android.internal.R.bool.config_localDisplaysMirrorContent)) {
                        mInfo.flags |= DisplayDeviceInfo.FLAG_OWN_CONTENT_ONLY;
                    }
 
                    if (isDisplayPrivate(physicalAddress)) {
                        mInfo.flags |= DisplayDeviceInfo.FLAG_PRIVATE;
                    }
                }
            }
            return mInfo;
        }
 
        @Override
        public Runnable requestDisplayStateLocked(final int state, final int brightness) {
            // Assume that the brightness is off if the display is being turned off.
            assert state != Display.STATE_OFF || brightness == PowerManager.BRIGHTNESS_OFF;
 
            final boolean stateChanged = (mState != state);
            final boolean brightnessChanged = (mBrightness != brightness) && mBacklight != null;
            if (stateChanged || brightnessChanged) {
                final long physicalDisplayId = mPhysicalDisplayId;
                final IBinder token = getDisplayTokenLocked();
                final int oldState = mState;
 
                if (stateChanged) {
                    mState = state;
                    updateDeviceInfoLocked();
                }
 
                if (brightnessChanged) {
                    mBrightness = brightness;
                }
 
                // Defer actually setting the display state until after we have exited
                // the critical section since it can take hundreds of milliseconds
                // to complete.
                return new Runnable() {
                    @Override
                    public void run() {
                        // Exit a suspended state before making any changes.
                        int currentState = oldState;
                        if (Display.isSuspendedState(oldState)
                                || oldState == Display.STATE_UNKNOWN) {
                            if (!Display.isSuspendedState(state)) {
                                setDisplayState(state);
                                currentState = state;
                            } else if (state == Display.STATE_DOZE_SUSPEND
                                    || oldState == Display.STATE_DOZE_SUSPEND) {
                                setDisplayState(Display.STATE_DOZE);
                                currentState = Display.STATE_DOZE;
                            } else if (state == Display.STATE_ON_SUSPEND
                                    || oldState == Display.STATE_ON_SUSPEND) {
                                setDisplayState(Display.STATE_ON);
                                currentState = Display.STATE_ON;
                            } else {
                                return; // old state and new state is off
                            }
                        }
 
                        // If the state change was from or to VR, then we need to tell the light
                        // so that it can apply appropriate VR brightness settings. Also, update the
                        // brightness so the state is propogated to light.
                        boolean vrModeChange = false;
                        if ((state == Display.STATE_VR || currentState == Display.STATE_VR) &&
                                currentState != state) {
                            setVrMode(state == Display.STATE_VR);
                            vrModeChange = true;
                        }
 
 
                        // Apply brightness changes given that we are in a non-suspended state.
                        if (brightnessChanged || vrModeChange) {
                            setDisplayBrightness(brightness);
                        }
 
                        // Enter the final desired state, possibly suspended.
                        if (state != currentState) {
                            setDisplayState(state);
                        }
                    }
 
                    private void setVrMode(boolean isVrEnabled) {
                        if (DEBUG) {
                            Slog.d(TAG, "setVrMode("
                                    + "id=" + physicalDisplayId
                                    + ", state=" + Display.stateToString(state) + ")");
                        }
                        mBacklight.setVrMode(isVrEnabled);
                    }
 
                    private void setDisplayState(int state) {
                        if (DEBUG) {
                            Slog.d(TAG, "setDisplayState("
                                    + "id=" + physicalDisplayId
                                    + ", state=" + Display.stateToString(state) + ")");
                        }
 
                        // We must tell sidekick to stop controlling the display before we
                        // can change its power mode, so do that first.
                        if (mSidekickActive) {
                            Trace.traceBegin(Trace.TRACE_TAG_POWER,
                                    "SidekickInternal#endDisplayControl");
                            try {
                                mSidekickInternal.endDisplayControl();
                            } finally {
                                Trace.traceEnd(Trace.TRACE_TAG_POWER);
                            }
                            mSidekickActive = false;
                        }
                        final int mode = getPowerModeForState(state);
                        Trace.traceBegin(Trace.TRACE_TAG_POWER, "setDisplayState("
                                + "id=" + physicalDisplayId
                                + ", state=" + Display.stateToString(state) + ")");
                        try {
                            SurfaceControl.setDisplayPowerMode(token, mode);
                            Trace.traceCounter(Trace.TRACE_TAG_POWER, "DisplayPowerMode", mode);
                        } finally {
                            Trace.traceEnd(Trace.TRACE_TAG_POWER);
                        }
                        // If we're entering a suspended (but not OFF) power state and we
                        // have a sidekick available, tell it now that it can take control.
                        if (Display.isSuspendedState(state) && state != Display.STATE_OFF
                                && mSidekickInternal != null && !mSidekickActive) {
                            Trace.traceBegin(Trace.TRACE_TAG_POWER,
                                    "SidekickInternal#startDisplayControl");
                            try {
                                mSidekickActive = mSidekickInternal.startDisplayControl(state);
                            } finally {
                                Trace.traceEnd(Trace.TRACE_TAG_POWER);
                            }
                        }
                    }
 
                    private void setDisplayBrightness(int brightness) {
                        if (DEBUG) {
                            Slog.d(TAG, "setDisplayBrightness("
                                    + "id=" + physicalDisplayId
                                    + ", brightness=" + brightness + ")");
                        }
 
                        Trace.traceBegin(Trace.TRACE_TAG_POWER, "setDisplayBrightness("
                                + "id=" + physicalDisplayId + ", brightness=" + brightness + ")");
                        try {
                            mBacklight.setBrightness(brightness);
                            Trace.traceCounter(Trace.TRACE_TAG_POWER,
                                    "ScreenBrightness", brightness);
                        } finally {
                            Trace.traceEnd(Trace.TRACE_TAG_POWER);
                        }
                    }
                };
            }
            return null;
        }
 
        @Override
        public void setRequestedColorModeLocked(int colorMode) {
            if (requestColorModeLocked(colorMode)) {
                updateDeviceInfoLocked();
            }
        }
 
        @Override
        public void setAllowedDisplayModesLocked(int[] modes) {
            updateAllowedModesLocked(modes);
        }
 
        @Override
        public void onOverlayChangedLocked() {
            updateDeviceInfoLocked();
        }
 
        public void onActivePhysicalDisplayModeChangedLocked(int physIndex) {
            if (updateActiveModeLocked(physIndex)) {
                updateDeviceInfoLocked();
            }
        }
 
        public boolean updateActiveModeLocked(int activePhysIndex) {
            if (mActivePhysIndex == activePhysIndex) {
                return false;
            }
            mActivePhysIndex = activePhysIndex;
            mActiveModeId = findMatchingModeIdLocked(activePhysIndex);
            mActiveModeInvalid = mActiveModeId == 0;
            if (mActiveModeInvalid) {
                Slog.w(TAG, "In unknown mode after setting allowed configs"
                        + ": allowedPhysIndexes=" + mAllowedPhysIndexes
                        + ", activePhysIndex=" + mActivePhysIndex);
            }
            return true;
        }
 
        public void updateAllowedModesLocked(int[] allowedModes) {
            if (Arrays.equals(allowedModes, mAllowedModeIds) && !mAllowedModeIdsInvalid) {
                return;
            }
            if (updateAllowedModesInternalLocked(allowedModes)) {
                updateDeviceInfoLocked();
            }
        }
 
        public boolean updateAllowedModesInternalLocked(int[] allowedModes) {
            if (DEBUG) {
                Slog.w(TAG, "updateAllowedModesInternalLocked(allowedModes="
                        + Arrays.toString(allowedModes) + ")");
            }
            int[] allowedPhysIndexes = new int[allowedModes.length];
            int size = 0;
            for (int modeId : allowedModes) {
                int physIndex = findDisplayInfoIndexLocked(modeId);
                if (physIndex < 0) {
                    Slog.w(TAG, "Requested mode ID " + modeId + " not available,"
                            + " dropping from allowed set.");
                } else {
                    allowedPhysIndexes[size++] = physIndex;
                }
            }
 
            // If we couldn't find one or more of the suggested allowed modes then we need to
            // shrink the array to its actual size.
            if (size != allowedModes.length) {
                allowedPhysIndexes = Arrays.copyOf(allowedPhysIndexes, size);
            }
 
            // If we found no suitable modes, then we try again with the default mode which we
            // assume has a suitable physical config.
            if (size == 0) {
                if (DEBUG) {
                    Slog.w(TAG, "No valid modes allowed, falling back to default mode (id="
                            + mDefaultModeId + ")");
                }
                allowedModes = new int[] { mDefaultModeId };
                allowedPhysIndexes = new int[] { findDisplayInfoIndexLocked(mDefaultModeId) };
            }
 
            mAllowedModeIds = allowedModes;
            mAllowedModeIdsInvalid = false;
 
            if (Arrays.equals(mAllowedPhysIndexes, allowedPhysIndexes)) {
                return false;
            }
            mAllowedPhysIndexes = allowedPhysIndexes;
 
            if (DEBUG) {
                Slog.w(TAG, "Setting allowed physical configs: allowedPhysIndexes="
                        + Arrays.toString(allowedPhysIndexes));
            }
 
            SurfaceControl.setAllowedDisplayConfigs(getDisplayTokenLocked(), allowedPhysIndexes);
            int activePhysIndex = SurfaceControl.getActiveConfig(getDisplayTokenLocked());
            return updateActiveModeLocked(activePhysIndex);
        }
 
        public boolean requestColorModeLocked(int colorMode) {
            if (mActiveColorMode == colorMode) {
                return false;
            }
            if (!mSupportedColorModes.contains(colorMode)) {
                Slog.w(TAG, "Unable to find color mode " + colorMode
                        + ", ignoring request.");
                return false;
            }
            SurfaceControl.setActiveColorMode(getDisplayTokenLocked(), colorMode);
            mActiveColorMode = colorMode;
            mActiveColorModeInvalid = false;
            return true;
        }
 
        @Override
        public void dumpLocked(PrintWriter pw) {
            super.dumpLocked(pw);
            pw.println("mPhysicalDisplayId=" + mPhysicalDisplayId);
            pw.println("mAllowedPhysIndexes=" + Arrays.toString(mAllowedPhysIndexes));
            pw.println("mAllowedModeIds=" + Arrays.toString(mAllowedModeIds));
            pw.println("mAllowedModeIdsInvalid=" + mAllowedModeIdsInvalid);
            pw.println("mActivePhysIndex=" + mActivePhysIndex);
            pw.println("mActiveModeId=" + mActiveModeId);
            pw.println("mActiveColorMode=" + mActiveColorMode);
            pw.println("mDefaultModeId=" + mDefaultModeId);
            pw.println("mState=" + Display.stateToString(mState));
            pw.println("mBrightness=" + mBrightness);
            pw.println("mBacklight=" + mBacklight);
            pw.println("mDisplayInfos=");
            for (int i = 0; i < mDisplayInfos.length; i++) {
                pw.println("  " + mDisplayInfos[i]);
            }
            pw.println("mSupportedModes=");
            for (int i = 0; i < mSupportedModes.size(); i++) {
                pw.println("  " + mSupportedModes.valueAt(i));
            }
            pw.print("mSupportedColorModes=[");
            for (int i = 0; i < mSupportedColorModes.size(); i++) {
                if (i != 0) {
                    pw.print(", ");
                }
                pw.print(mSupportedColorModes.get(i));
            }
            pw.println("]");
        }
 
        private int findDisplayInfoIndexLocked(int modeId) {
            DisplayModeRecord record = mSupportedModes.get(modeId);
            if (record != null) {
                for (int i = 0; i < mDisplayInfos.length; i++) {
                    SurfaceControl.PhysicalDisplayInfo info = mDisplayInfos[i];
                    if (record.hasMatchingMode(info)){
                        return i;
                    }
                }
            }
            return -1;
        }
 
        private int findMatchingModeIdLocked(int physIndex) {
            SurfaceControl.PhysicalDisplayInfo info = mDisplayInfos[physIndex];
            for (int i = 0; i < mSupportedModes.size(); i++) {
                DisplayModeRecord record = mSupportedModes.valueAt(i);
                if (record.hasMatchingMode(info)) {
                    return record.mMode.getModeId();
                }
            }
            return 0;
        }
 
        private void updateDeviceInfoLocked() {
            mInfo = null;
            sendDisplayDeviceEventLocked(this, DISPLAY_DEVICE_EVENT_CHANGED);
        }
 
        private Display.Mode[] getDisplayModes(SparseArray<DisplayModeRecord> records) {
            final int size = records.size();
            Display.Mode[] modes = new Display.Mode[size];
            for (int i = 0; i < size; i++) {
                DisplayModeRecord record = records.valueAt(i);
                modes[i] = record.mMode;
            }
            return modes;
        }
 
        private boolean isDisplayPrivate(DisplayAddress.Physical physicalAddress) {
            if (physicalAddress == null) {
                return false;
            }
            final Resources res = getOverlayContext().getResources();
            int[] ports = res.getIntArray(
                    com.android.internal.R.array.config_localPrivateDisplayPorts);
            if (ports != null) {
                int port = physicalAddress.getPort();
                for (int p : ports) {
                    if (p == port) {
                        return true;
                    }
                }
            }
            return false;
        }
    }
 
    /** Supplies a context whose Resources apply runtime-overlays */
    Context getOverlayContext() {
        return ActivityThread.currentActivityThread().getSystemUiContext();
    }
 
    /**
     * Keeps track of a display configuration.
     */
    private static final class DisplayModeRecord {
        public final Display.Mode mMode;
 
        public DisplayModeRecord(SurfaceControl.PhysicalDisplayInfo phys) {
            mMode = createMode(phys.width, phys.height, phys.refreshRate);
        }
 
        /**
         * Returns whether the mode generated by the given PhysicalDisplayInfo matches the mode
         * contained by the record modulo mode ID.
         *
         * Note that this doesn't necessarily mean the the PhysicalDisplayInfos are identical, just
         * that they generate identical modes.
         */
        public boolean hasMatchingMode(SurfaceControl.PhysicalDisplayInfo info) {
            int modeRefreshRate = Float.floatToIntBits(mMode.getRefreshRate());
            int displayInfoRefreshRate = Float.floatToIntBits(info.refreshRate);
            return mMode.getPhysicalWidth() == info.width
                    && mMode.getPhysicalHeight() == info.height
                    && modeRefreshRate == displayInfoRefreshRate;
        }
 
        public String toString() {
            return "DisplayModeRecord{mMode=" + mMode + "}";
        }
    }
 
    private final class PhysicalDisplayEventReceiver extends DisplayEventReceiver {
        PhysicalDisplayEventReceiver(Looper looper) {
            super(looper, VSYNC_SOURCE_APP);
        }
 
        @Override
        public void onHotplug(long timestampNanos, long physicalDisplayId, boolean connected) {
            synchronized (getSyncRoot()) {
                if (connected) {
                    tryConnectDisplayLocked(physicalDisplayId);
                } else {
                    tryDisconnectDisplayLocked(physicalDisplayId);
                }
            }
        }
 
        @Override
        public void onConfigChanged(long timestampNanos, long physicalDisplayId, int physIndex) {
            if (DEBUG) {
                Slog.d(TAG, "onConfigChanged("
                        + "timestampNanos=" + timestampNanos
                        + ", physicalDisplayId=" + physicalDisplayId
                        + ", physIndex=" + physIndex + ")");
            }
            synchronized (getSyncRoot()) {
                LocalDisplayDevice device = mDevices.get(physicalDisplayId);
                if (device == null) {
                    if (DEBUG) {
                        Slog.d(TAG, "Received config change for unhandled physical display: "
                                + "physicalDisplayId=" + physicalDisplayId);
                    }
                    return;
                }
                device.onActivePhysicalDisplayModeChangedLocked(physIndex);
            }
        }
    }
}