summaryrefslogtreecommitdiffstats
path: root/gfx/thebes/gfxPlatformGtk.cpp
blob: ee2362c73c3f60c12be78f52c17c0e86f6346e3f (plain)
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
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#define PANGO_ENABLE_BACKEND
#define PANGO_ENABLE_ENGINE

#include "gfxPlatformGtk.h"

#include <gtk/gtk.h>
#include <fontconfig/fontconfig.h>

#include "base/task.h"
#include "base/thread.h"
#include "base/message_loop.h"
#include "cairo.h"
#include "gfx2DGlue.h"
#include "gfxFcPlatformFontList.h"
#include "gfxConfig.h"
#include "gfxContext.h"
#include "gfxImageSurface.h"
#include "gfxUserFontSet.h"
#include "gfxUtils.h"
#include "gfxFT2FontBase.h"
#include "gfxTextRun.h"
#include "GLContextProvider.h"
#include "mozilla/Atomics.h"
#include "mozilla/Components.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/FontPropertyTypes.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/Logging.h"
#include "mozilla/Monitor.h"
#include "mozilla/Preferences.h"
#include "mozilla/StaticPrefs_gfx.h"
#include "mozilla/StaticPrefs_layers.h"
#include "mozilla/StaticPrefs_media.h"
#include "nsAppRunner.h"
#include "nsIGfxInfo.h"
#include "nsMathUtils.h"
#include "nsUnicharUtils.h"
#include "nsUnicodeProperties.h"
#include "prenv.h"
#include "VsyncSource.h"
#include "mozilla/WidgetUtilsGtk.h"

#ifdef MOZ_X11
#  include "mozilla/gfx/XlibDisplay.h"
#  include <gdk/gdkx.h>
#  include <X11/extensions/Xrandr.h>
#  include "cairo-xlib.h"
#  include "gfxXlibSurface.h"
#  include "GLContextGLX.h"
#  include "GLXLibrary.h"
#  include "mozilla/X11Util.h"
#  include "SoftwareVsyncSource.h"

/* Undefine the Status from Xlib since it will conflict with system headers on
 * OSX */
#  if defined(__APPLE__) && defined(Status)
#    undef Status
#  endif
#endif /* MOZ_X11 */

#ifdef MOZ_WAYLAND
#  include <gdk/gdkwayland.h>
#  include "mozilla/widget/nsWaylandDisplay.h"
#  include "mozilla/widget/DMABufLibWrapper.h"
#  include "mozilla/StaticPrefs_widget.h"
#endif

#define GDK_PIXMAP_SIZE_MAX 32767

#define GFX_PREF_MAX_GENERIC_SUBSTITUTIONS \
  "gfx.font_rendering.fontconfig.max_generic_substitutions"

using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::unicode;
using namespace mozilla::widget;

static FT_Library gPlatformFTLibrary = nullptr;
static int32_t sDPI;

static void screen_resolution_changed(GdkScreen* aScreen, GParamSpec* aPspec,
                                      gpointer aClosure) {
  sDPI = 0;
}

#if defined(MOZ_X11)
// TODO(aosmond): The envvar is deprecated. We should remove it once EGL is the
// default in release.
static bool IsX11EGLEnvvarEnabled() {
  const char* eglPref = PR_GetEnv("MOZ_X11_EGL");
  return (eglPref && *eglPref);
}
#endif

gfxPlatformGtk::gfxPlatformGtk() {
  if (!gfxPlatform::IsHeadless()) {
    gtk_init(nullptr, nullptr);
  }

  mIsX11Display = gfxPlatform::IsHeadless() ? false : GdkIsX11Display();
  if (XRE_IsParentProcess()) {
    InitX11EGLConfig();
    if (IsWaylandDisplay() || gfxConfig::IsEnabled(Feature::X11_EGL)) {
      gfxVars::SetUseEGL(true);
    }
    InitDmabufConfig();
    if (gfxConfig::IsEnabled(Feature::DMABUF)) {
      gfxVars::SetUseDMABuf(true);
    }
  }

  InitBackendPrefs(GetBackendPrefs());

  gPlatformFTLibrary = Factory::NewFTLibrary();
  MOZ_RELEASE_ASSERT(gPlatformFTLibrary);
  Factory::SetFTLibrary(gPlatformFTLibrary);

  GdkScreen* gdkScreen = gdk_screen_get_default();
  if (gdkScreen) {
    g_signal_connect(gdkScreen, "notify::resolution",
                     G_CALLBACK(screen_resolution_changed), nullptr);
  }

  // Bug 1714483: Force disable FXAA Antialiasing on NV drivers. This is a
  // temporary workaround for a driver bug.
  PR_SetEnv("__GL_ALLOW_FXAA_USAGE=0");
}

gfxPlatformGtk::~gfxPlatformGtk() {
  Factory::ReleaseFTLibrary(gPlatformFTLibrary);
  gPlatformFTLibrary = nullptr;
}

void gfxPlatformGtk::InitX11EGLConfig() {
  FeatureState& feature = gfxConfig::GetFeature(Feature::X11_EGL);
#ifdef MOZ_X11
  feature.EnableByDefault();

  if (StaticPrefs::gfx_x11_egl_force_enabled_AtStartup()) {
    feature.UserForceEnable("Force enabled by pref");
  } else if (IsX11EGLEnvvarEnabled()) {
    feature.UserForceEnable("Force enabled by envvar");
  } else if (StaticPrefs::gfx_x11_egl_force_disabled_AtStartup()) {
    feature.UserDisable("Force disabled by pref",
                        "FEATURE_FAILURE_USER_FORCE_DISABLED"_ns);
  }

  nsCString failureId;
  int32_t status;
  nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
  if (NS_FAILED(gfxInfo->GetFeatureStatus(nsIGfxInfo::FEATURE_X11_EGL,
                                          failureId, &status))) {
    feature.Disable(FeatureStatus::BlockedNoGfxInfo, "gfxInfo is broken",
                    "FEATURE_FAILURE_NO_GFX_INFO"_ns);
  } else if (status != nsIGfxInfo::FEATURE_STATUS_OK) {
    feature.Disable(FeatureStatus::Blocklisted, "Blocklisted by gfxInfo",
                    failureId);
  }

  nsAutoString testType;
  gfxInfo->GetTestType(testType);
  // We can only use X11/EGL if we actually found the EGL library and
  // successfully use it to determine system information in glxtest.
  if (testType != u"EGL") {
    feature.ForceDisable(FeatureStatus::Broken, "glxtest could not use EGL",
                         "FEATURE_FAILURE_GLXTEST_NO_EGL"_ns);
  }

  if (feature.IsEnabled() && IsX11Display()) {
    // Enabling glthread crashes on X11/EGL, see bug 1670545
    PR_SetEnv("mesa_glthread=false");
  }
#else
  feature.DisableByDefault(FeatureStatus::Unavailable, "X11 support missing",
                           "FEATURE_FAILURE_NO_X11"_ns);
#endif
}

void gfxPlatformGtk::InitDmabufConfig() {
  FeatureState& feature = gfxConfig::GetFeature(Feature::DMABUF);
#ifdef MOZ_WAYLAND
  feature.EnableByDefault();

  if (StaticPrefs::widget_dmabuf_force_enabled_AtStartup()) {
    feature.UserForceEnable("Force enabled by pref");
  }

  nsCString failureId;
  int32_t status;
  nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
  if (NS_FAILED(gfxInfo->GetFeatureStatus(nsIGfxInfo::FEATURE_DMABUF, failureId,
                                          &status))) {
    feature.Disable(FeatureStatus::BlockedNoGfxInfo, "gfxInfo is broken",
                    "FEATURE_FAILURE_NO_GFX_INFO"_ns);
  } else if (status != nsIGfxInfo::FEATURE_STATUS_OK) {
    feature.Disable(FeatureStatus::Blocklisted, "Blocklisted by gfxInfo",
                    failureId);
  }

  if (!gfxVars::UseEGL()) {
    feature.ForceDisable(FeatureStatus::Unavailable, "Requires EGL",
                         "FEATURE_FAILURE_REQUIRES_EGL"_ns);
  }

  if (feature.IsEnabled()) {
    nsAutoCString drmRenderDevice;
    gfxInfo->GetDrmRenderDevice(drmRenderDevice);
    gfxVars::SetDrmRenderDevice(drmRenderDevice);

    if (!GetDMABufDevice()->IsEnabled(failureId)) {
      feature.ForceDisable(FeatureStatus::Failed, "Failed to configure",
                           failureId);
    }
  }
#else
  feature.DisableByDefault(FeatureStatus::Unavailable,
                           "Wayland support missing",
                           "FEATURE_FAILURE_NO_WAYLAND"_ns);
#endif
}

bool gfxPlatformGtk::InitVAAPIConfig(bool aForceEnabledByUser) {
  FeatureState& feature =
      gfxConfig::GetFeature(Feature::HARDWARE_VIDEO_DECODING);
  // We're already configured in parent process
  if (!XRE_IsParentProcess()) {
    return feature.IsEnabled();
  }
#ifdef MOZ_WAYLAND
  feature.EnableByDefault();

  int32_t status = nsIGfxInfo::FEATURE_STATUS_UNKNOWN;
  nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
  nsCString failureId;
  if (NS_FAILED(gfxInfo->GetFeatureStatus(
          nsIGfxInfo::FEATURE_HARDWARE_VIDEO_DECODING, failureId, &status))) {
    feature.Disable(FeatureStatus::BlockedNoGfxInfo, "gfxInfo is broken",
                    "FEATURE_FAILURE_NO_GFX_INFO"_ns);
  } else if (status == nsIGfxInfo::FEATURE_BLOCKED_PLATFORM_TEST) {
    feature.ForceDisable(FeatureStatus::Unavailable,
                         "Force disabled by gfxInfo", failureId);
  } else if (status != nsIGfxInfo::FEATURE_STATUS_OK) {
    feature.Disable(FeatureStatus::Blocklisted, "Blocklisted by gfxInfo",
                    failureId);
  }
  if (aForceEnabledByUser) {
    feature.UserForceEnable("Force enabled by pref");
  }
  if (!gfxVars::UseEGL()) {
    feature.ForceDisable(FeatureStatus::Unavailable, "Requires EGL",
                         "FEATURE_FAILURE_REQUIRES_EGL"_ns);
  }

  if (!gfxVars::WebglUseHardware()) {
    feature.Disable(FeatureStatus::Blocklisted,
                    "DMABuf disabled with software rendering", failureId);
  }

  // Configure zero-copy playback feature.
  if (feature.IsEnabled()) {
    FeatureState& featureZeroCopy =
        gfxConfig::GetFeature(Feature::HW_DECODED_VIDEO_ZERO_COPY);

    featureZeroCopy.EnableByDefault();
    uint32_t state =
        StaticPrefs::media_ffmpeg_vaapi_force_surface_zero_copy_AtStartup();
    if (state == 0) {
      featureZeroCopy.UserDisable("Force disable by pref",
                                  "FEATURE_FAILURE_USER_FORCE_DISABLED"_ns);
    } else if (state == 1) {
      featureZeroCopy.UserEnable("Force enabled by pref");
    } else {
      nsCString failureId;
      int32_t status = nsIGfxInfo::FEATURE_STATUS_UNKNOWN;
      nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
      if (NS_FAILED(gfxInfo->GetFeatureStatus(
              nsIGfxInfo::FEATURE_HW_DECODED_VIDEO_ZERO_COPY, failureId,
              &status))) {
        featureZeroCopy.Disable(FeatureStatus::BlockedNoGfxInfo,
                                "gfxInfo is broken",
                                "FEATURE_FAILURE_NO_GFX_INFO"_ns);
      } else if (status == nsIGfxInfo::FEATURE_BLOCKED_PLATFORM_TEST) {
        featureZeroCopy.ForceDisable(FeatureStatus::Unavailable,
                                     "Force disabled by gfxInfo", failureId);
      } else if (status != nsIGfxInfo::FEATURE_ALLOW_ALWAYS) {
        featureZeroCopy.Disable(FeatureStatus::Blocklisted,
                                "Blocklisted by gfxInfo", failureId);
      }
    }
    if (featureZeroCopy.IsEnabled()) {
      gfxVars::SetHwDecodedVideoZeroCopy(true);
    }
  }
#else
  feature.DisableByDefault(FeatureStatus::Unavailable,
                           "Wayland support missing",
                           "FEATURE_FAILURE_NO_WAYLAND"_ns);
#endif
  return feature.IsEnabled();
}

void gfxPlatformGtk::InitWebRenderConfig() {
  gfxPlatform::InitWebRenderConfig();

  if (!XRE_IsParentProcess()) {
    return;
  }

  FeatureState& feature = gfxConfig::GetFeature(Feature::WEBRENDER_COMPOSITOR);
#ifdef RELEASE_OR_BETA
  feature.ForceDisable(FeatureStatus::Blocked,
                       "Cannot be enabled in release or beta",
                       "FEATURE_FAILURE_DISABLE_RELEASE_OR_BETA"_ns);
#else
  if (feature.IsEnabled()) {
    if (!IsWaylandDisplay()) {
      feature.ForceDisable(FeatureStatus::Unavailable,
                           "Wayland support missing",
                           "FEATURE_FAILURE_NO_WAYLAND"_ns);
    }
#  ifdef MOZ_WAYLAND
    else if (gfxConfig::IsEnabled(Feature::WEBRENDER) &&
             !gfxConfig::IsEnabled(Feature::DMABUF)) {
      // We use zwp_linux_dmabuf_v1 and GBM directly to manage FBOs. In theory
      // this is also possible vie EGLstreams, but we don't bother to implement
      // it as recent NVidia drivers support GBM and DMABuf as well.
      feature.ForceDisable(FeatureStatus::Unavailable,
                           "Hardware Webrender requires DMAbuf support",
                           "FEATURE_FAILURE_NO_DMABUF"_ns);
    } else if (!widget::WaylandDisplayGet()->GetViewporter()) {
      feature.ForceDisable(FeatureStatus::Unavailable,
                           "Requires wp_viewporter protocol support",
                           "FEATURE_FAILURE_REQUIRES_WPVIEWPORTER"_ns);
    }
#  endif  // MOZ_WAYLAND
  }
#endif    // RELEASE_OR_BETA

  gfxVars::SetUseWebRenderCompositor(feature.IsEnabled());
}

void gfxPlatformGtk::InitPlatformGPUProcessPrefs() {
#ifdef MOZ_WAYLAND
  if (IsWaylandDisplay()) {
    FeatureState& gpuProc = gfxConfig::GetFeature(Feature::GPU_PROCESS);
    gpuProc.ForceDisable(FeatureStatus::Blocked,
                         "Wayland does not work in the GPU process",
                         "FEATURE_FAILURE_WAYLAND"_ns);
  }
#endif
}

already_AddRefed<gfxASurface> gfxPlatformGtk::CreateOffscreenSurface(
    const IntSize& aSize, gfxImageFormat aFormat) {
  if (!Factory::AllowedSurfaceSize(aSize)) {
    return nullptr;
  }

  RefPtr<gfxASurface> newSurface;
  bool needsClear = true;
  // XXX we really need a different interface here, something that passes
  // in more context, including the display and/or target surface type that
  // we should try to match
  GdkScreen* gdkScreen = gdk_screen_get_default();
  if (gdkScreen) {
    newSurface = new gfxImageSurface(aSize, aFormat);
    // The gfxImageSurface ctor zeroes this for us, no need to
    // waste time clearing again
    needsClear = false;
  }

  if (!newSurface) {
    // We couldn't create a native surface for whatever reason;
    // e.g., no display, no RENDER, bad size, etc.
    // Fall back to image surface for the data.
    newSurface = new gfxImageSurface(aSize, aFormat);
  }

  if (newSurface->CairoStatus()) {
    newSurface = nullptr;  // surface isn't valid for some reason
  }

  if (newSurface && needsClear) {
    gfxUtils::ClearThebesSurface(newSurface);
  }

  return newSurface.forget();
}

nsresult gfxPlatformGtk::GetFontList(nsAtom* aLangGroup,
                                     const nsACString& aGenericFamily,
                                     nsTArray<nsString>& aListOfFonts) {
  gfxPlatformFontList::PlatformFontList()->GetFontList(
      aLangGroup, aGenericFamily, aListOfFonts);
  return NS_OK;
}

// xxx - this is ubuntu centric, need to go through other distros and flesh
// out a more general list
static const char kFontDejaVuSans[] = "DejaVu Sans";
static const char kFontDejaVuSerif[] = "DejaVu Serif";
static const char kFontFreeSans[] = "FreeSans";
static const char kFontFreeSerif[] = "FreeSerif";
static const char kFontTakaoPGothic[] = "TakaoPGothic";
static const char kFontTwemojiMozilla[] = "Twemoji Mozilla";
static const char kFontDroidSansFallback[] = "Droid Sans Fallback";
static const char kFontWenQuanYiMicroHei[] = "WenQuanYi Micro Hei";
static const char kFontNanumGothic[] = "NanumGothic";
static const char kFontSymbola[] = "Symbola";
static const char kFontNotoSansSymbols[] = "Noto Sans Symbols";
static const char kFontNotoSansSymbols2[] = "Noto Sans Symbols2";

void gfxPlatformGtk::GetCommonFallbackFonts(uint32_t aCh, Script aRunScript,
                                            eFontPresentation aPresentation,
                                            nsTArray<const char*>& aFontList) {
  if (PrefersColor(aPresentation)) {
    aFontList.AppendElement(kFontTwemojiMozilla);
  }

  aFontList.AppendElement(kFontDejaVuSerif);
  aFontList.AppendElement(kFontFreeSerif);
  aFontList.AppendElement(kFontDejaVuSans);
  aFontList.AppendElement(kFontFreeSans);
  aFontList.AppendElement(kFontSymbola);
  aFontList.AppendElement(kFontNotoSansSymbols);
  aFontList.AppendElement(kFontNotoSansSymbols2);

  // add fonts for CJK ranges
  // xxx - this isn't really correct, should use the same CJK font ordering
  // as the pref font code
  if (aCh >= 0x3000 && ((aCh < 0xe000) || (aCh >= 0xf900 && aCh < 0xfff0) ||
                        ((aCh >> 16) == 2))) {
    aFontList.AppendElement(kFontTakaoPGothic);
    aFontList.AppendElement(kFontDroidSansFallback);
    aFontList.AppendElement(kFontWenQuanYiMicroHei);
    aFontList.AppendElement(kFontNanumGothic);
  }
}

void gfxPlatformGtk::ReadSystemFontList(
    mozilla::dom::SystemFontList* retValue) {
  gfxFcPlatformFontList::PlatformFontList()->ReadSystemFontList(retValue);
}

bool gfxPlatformGtk::CreatePlatformFontList() {
  return gfxPlatformFontList::Initialize(new gfxFcPlatformFontList);
}

int32_t gfxPlatformGtk::GetFontScaleDPI() {
  MOZ_ASSERT(XRE_IsParentProcess(),
             "You can access this via LookAndFeel if you need it in child "
             "processes");
  if (MOZ_LIKELY(sDPI != 0)) {
    return sDPI;
  }
  GdkScreen* screen = gdk_screen_get_default();
  // Ensure settings in config files are processed.
  gtk_settings_get_for_screen(screen);
  int32_t dpi = int32_t(round(gdk_screen_get_resolution(screen)));
  if (dpi <= 0) {
    // Fall back to something reasonable
    dpi = 96;
  }
  sDPI = dpi;
  return dpi;
}

double gfxPlatformGtk::GetFontScaleFactor() {
  // Integer scale factors work well with GTK window scaling, image scaling, and
  // pixel alignment, but there is a range where 1 is too small and 2 is too
  // big.
  //
  // An additional step of 1.5 is added because this is common scale on WINNT
  // and at this ratio the advantages of larger rendering outweigh the
  // disadvantages from scaling and pixel mis-alignment.
  //
  // A similar step for 1.25 is added as well, because this is the scale that
  // "Large text" settings use in gnome, and it seems worth to allow, especially
  // on already-hidpi environments.
  int32_t dpi = GetFontScaleDPI();
  if (dpi < 120) {
    return 1.0;
  }
  if (dpi < 132) {
    return 1.25;
  }
  if (dpi < 168) {
    return 1.5;
  }
  return round(dpi / 96.0);
}

gfxImageFormat gfxPlatformGtk::GetOffscreenFormat() {
  // Make sure there is a screen
  GdkScreen* screen = gdk_screen_get_default();
  if (screen && gdk_visual_get_depth(gdk_visual_get_system()) == 16) {
    return SurfaceFormat::R5G6B5_UINT16;
  }

  return SurfaceFormat::X8R8G8B8_UINT32;
}

void gfxPlatformGtk::FontsPrefsChanged(const char* aPref) {
  // only checking for generic substitions, pass other changes up
  if (strcmp(GFX_PREF_MAX_GENERIC_SUBSTITUTIONS, aPref) != 0) {
    gfxPlatform::FontsPrefsChanged(aPref);
    return;
  }

  gfxFcPlatformFontList* pfl = gfxFcPlatformFontList::PlatformFontList();
  pfl->ClearGenericMappings();
  FlushFontAndWordCaches();
}

bool gfxPlatformGtk::AccelerateLayersByDefault() { return true; }

#if defined(MOZ_X11)

static nsTArray<uint8_t> GetDisplayICCProfile(Display* dpy, Window& root) {
  const char kIccProfileAtomName[] = "_ICC_PROFILE";
  Atom iccAtom = XInternAtom(dpy, kIccProfileAtomName, TRUE);
  if (!iccAtom) {
    return nsTArray<uint8_t>();
  }

  Atom retAtom;
  int retFormat;
  unsigned long retLength, retAfter;
  unsigned char* retProperty;

  if (XGetWindowProperty(dpy, root, iccAtom, 0, INT_MAX /* length */, X11False,
                         AnyPropertyType, &retAtom, &retFormat, &retLength,
                         &retAfter, &retProperty) != Success) {
    return nsTArray<uint8_t>();
  }

  nsTArray<uint8_t> result;

  if (retLength > 0) {
    result.AppendElements(static_cast<uint8_t*>(retProperty), retLength);
  }

  XFree(retProperty);

  return result;
}

nsTArray<uint8_t> gfxPlatformGtk::GetPlatformCMSOutputProfileData() {
  nsTArray<uint8_t> prefProfileData = GetPrefCMSOutputProfileData();
  if (!prefProfileData.IsEmpty()) {
    return prefProfileData;
  }

  if (XRE_IsContentProcess()) {
    MOZ_ASSERT(NS_IsMainThread());
    // This will be passed in during InitChild so we can avoid sending a
    // sync message back to the parent during init.
    const mozilla::gfx::ContentDeviceData* contentDeviceData =
        GetInitContentDeviceData();
    if (contentDeviceData) {
      // On Windows, we assert that the profile isn't empty, but on
      // Linux it can legitimately be empty if the display isn't
      // calibrated.  Thus, no assertion here.
      return contentDeviceData->cmsOutputProfileData().Clone();
    }

    // Otherwise we need to ask the parent for the updated color profile
    mozilla::dom::ContentChild* cc = mozilla::dom::ContentChild::GetSingleton();
    nsTArray<uint8_t> result;
    Unused << cc->SendGetOutputColorProfileData(&result);
    return result;
  }

  if (!mIsX11Display) {
    return nsTArray<uint8_t>();
  }

  GdkDisplay* display = gdk_display_get_default();
  Display* dpy = GDK_DISPLAY_XDISPLAY(display);
  // In xpcshell tests, we never initialize X and hence don't have a Display.
  // In this case, there's no output colour management to be done, so we just
  // return with nullptr.
  if (!dpy) {
    return nsTArray<uint8_t>();
  }

  Window root = gdk_x11_get_default_root_xwindow();

  // First try ICC Profile
  nsTArray<uint8_t> iccResult = GetDisplayICCProfile(dpy, root);
  if (!iccResult.IsEmpty()) {
    return iccResult;
  }

  // If ICC doesn't work, then try EDID
  const char kEdid1AtomName[] = "XFree86_DDC_EDID1_RAWDATA";
  Atom edidAtom = XInternAtom(dpy, kEdid1AtomName, TRUE);
  if (!edidAtom) {
    return nsTArray<uint8_t>();
  }

  Atom retAtom;
  int retFormat;
  unsigned long retLength, retAfter;
  unsigned char* retProperty;

  if (XGetWindowProperty(dpy, root, edidAtom, 0, 32, X11False, AnyPropertyType,
                         &retAtom, &retFormat, &retLength, &retAfter,
                         &retProperty) != Success) {
    return nsTArray<uint8_t>();
  }

  if (retLength != 128) {
    return nsTArray<uint8_t>();
  }

  // Format documented in "VESA E-EDID Implementation Guide"
  float gamma = (100 + (float)retProperty[0x17]) / 100.0f;

  qcms_CIE_xyY whitePoint;
  whitePoint.x =
      ((retProperty[0x21] << 2) | (retProperty[0x1a] >> 2 & 3)) / 1024.0;
  whitePoint.y =
      ((retProperty[0x22] << 2) | (retProperty[0x1a] >> 0 & 3)) / 1024.0;
  whitePoint.Y = 1.0;

  qcms_CIE_xyYTRIPLE primaries;
  primaries.red.x =
      ((retProperty[0x1b] << 2) | (retProperty[0x19] >> 6 & 3)) / 1024.0;
  primaries.red.y =
      ((retProperty[0x1c] << 2) | (retProperty[0x19] >> 4 & 3)) / 1024.0;
  primaries.red.Y = 1.0;

  primaries.green.x =
      ((retProperty[0x1d] << 2) | (retProperty[0x19] >> 2 & 3)) / 1024.0;
  primaries.green.y =
      ((retProperty[0x1e] << 2) | (retProperty[0x19] >> 0 & 3)) / 1024.0;
  primaries.green.Y = 1.0;

  primaries.blue.x =
      ((retProperty[0x1f] << 2) | (retProperty[0x1a] >> 6 & 3)) / 1024.0;
  primaries.blue.y =
      ((retProperty[0x20] << 2) | (retProperty[0x1a] >> 4 & 3)) / 1024.0;
  primaries.blue.Y = 1.0;

  XFree(retProperty);

  void* mem = nullptr;
  size_t size = 0;
  qcms_data_create_rgb_with_gamma(whitePoint, primaries, gamma, &mem, &size);
  if (!mem) {
    return nsTArray<uint8_t>();
  }

  nsTArray<uint8_t> result;
  result.AppendElements(static_cast<uint8_t*>(mem), size);
  free(mem);

  // XXX: It seems like we get wrong colors when using this constructed profile:
  // See bug 1696819. For now just forget that we made it.
  return nsTArray<uint8_t>();
}

#else  // defined(MOZ_X11)

nsTArray<uint8_t> gfxPlatformGtk::GetPlatformCMSOutputProfileData() {
  return nsTArray<uint8_t>();
}

#endif

bool gfxPlatformGtk::CheckVariationFontSupport() {
  // Although there was some variation/multiple-master support in FreeType
  // in older versions, it seems too incomplete/unstable for us to use
  // until at least 2.7.1.
  FT_Int major, minor, patch;
  FT_Library_Version(Factory::GetFTLibrary(), &major, &minor, &patch);
  return major * 1000000 + minor * 1000 + patch >= 2007001;
}

#ifdef MOZ_X11

class GtkVsyncSource final : public VsyncSource {
 public:
  GtkVsyncSource()
      : mGLContext(nullptr),
        mXDisplay(nullptr),
        mSetupLock("GLXVsyncSetupLock"),
        mVsyncThread("GLXVsyncThread"),
        mVsyncTask(nullptr),
        mVsyncEnabledLock("GLXVsyncEnabledLock"),
        mVsyncEnabled(false) {
    MOZ_ASSERT(NS_IsMainThread());
  }

  virtual ~GtkVsyncSource() { MOZ_ASSERT(NS_IsMainThread()); }

  // Sets up the display's GL context on a worker thread.
  // Required as GLContexts may only be used by the creating thread.
  // Returns true if setup was a success.
  bool Setup() {
    MonitorAutoLock lock(mSetupLock);
    MOZ_ASSERT(NS_IsMainThread());
    if (!mVsyncThread.Start()) return false;

    RefPtr<Runnable> vsyncSetup =
        NewRunnableMethod("GtkVsyncSource::SetupGLContext", this,
                          &GtkVsyncSource::SetupGLContext);
    mVsyncThread.message_loop()->PostTask(vsyncSetup.forget());
    // Wait until the setup has completed.
    lock.Wait();
    return mGLContext != nullptr;
  }

  // Called on the Vsync thread to setup the GL context.
  void SetupGLContext() {
    MonitorAutoLock lock(mSetupLock);
    MOZ_ASSERT(!NS_IsMainThread());
    MOZ_ASSERT(!mGLContext, "GLContext already setup!");

    // Create video sync timer on a separate Display to prevent locking the
    // main thread X display.
    mXDisplay = XOpenDisplay(nullptr);
    if (!mXDisplay) {
      lock.NotifyAll();
      return;
    }

    // Most compositors wait for vsync events on the root window.
    Window root = DefaultRootWindow(mXDisplay);
    int screen = DefaultScreen(mXDisplay);

    ScopedXFree<GLXFBConfig> cfgs;
    GLXFBConfig config;
    int visid;
    bool forWebRender = false;
    if (!gl::GLContextGLX::FindFBConfigForWindow(
            mXDisplay, screen, root, &cfgs, &config, &visid, forWebRender)) {
      lock.NotifyAll();
      return;
    }

    mGLContext = gl::GLContextGLX::CreateGLContext(
        {}, gfx::XlibDisplay::Borrow(mXDisplay), root, config);

    if (!mGLContext) {
      lock.NotifyAll();
      return;
    }

    mGLContext->MakeCurrent();

    // Test that SGI_video_sync lets us get the counter.
    unsigned int syncCounter = 0;
    if (gl::sGLXLibrary.fGetVideoSync(&syncCounter) != 0) {
      mGLContext = nullptr;
    }

    lock.NotifyAll();
  }

  virtual void EnableVsync() override {
    MOZ_ASSERT(NS_IsMainThread());
    MOZ_ASSERT(mGLContext, "GLContext not setup!");

    MonitorAutoLock lock(mVsyncEnabledLock);
    if (mVsyncEnabled) {
      return;
    }
    mVsyncEnabled = true;

    // If the task has not nulled itself out, it hasn't yet realized
    // that vsync was disabled earlier, so continue its execution.
    if (!mVsyncTask) {
      mVsyncTask = NewRunnableMethod("GtkVsyncSource::RunVsync", this,
                                     &GtkVsyncSource::RunVsync);
      RefPtr<Runnable> addrefedTask = mVsyncTask;
      mVsyncThread.message_loop()->PostTask(addrefedTask.forget());
    }
  }

  virtual void DisableVsync() override {
    MonitorAutoLock lock(mVsyncEnabledLock);
    mVsyncEnabled = false;
  }

  virtual bool IsVsyncEnabled() override {
    MonitorAutoLock lock(mVsyncEnabledLock);
    return mVsyncEnabled;
  }

  virtual void Shutdown() override {
    MOZ_ASSERT(NS_IsMainThread());
    DisableVsync();

    // Cleanup thread-specific resources before shutting down.
    RefPtr<Runnable> shutdownTask = NewRunnableMethod(
        "GtkVsyncSource::Cleanup", this, &GtkVsyncSource::Cleanup);
    mVsyncThread.message_loop()->PostTask(shutdownTask.forget());

    // Stop, waiting for the cleanup task to finish execution.
    mVsyncThread.Stop();
  }

 private:
  void RunVsync() {
    MOZ_ASSERT(!NS_IsMainThread());

    mGLContext->MakeCurrent();

    unsigned int syncCounter = 0;
    gl::sGLXLibrary.fGetVideoSync(&syncCounter);
    for (;;) {
      {
        MonitorAutoLock lock(mVsyncEnabledLock);
        if (!mVsyncEnabled) {
          mVsyncTask = nullptr;
          return;
        }
      }

      TimeStamp lastVsync = TimeStamp::Now();
      bool useSoftware = false;

      // Wait until the video sync counter reaches the next value by waiting
      // until the parity of the counter value changes.
      unsigned int nextSync = syncCounter + 1;
      int status;
      if ((status = gl::sGLXLibrary.fWaitVideoSync(2, (int)nextSync % 2,
                                                   &syncCounter)) != 0) {
        gfxWarningOnce() << "glXWaitVideoSync returned " << status;
        useSoftware = true;
      }

      if (syncCounter == (nextSync - 1)) {
        gfxWarningOnce()
            << "glXWaitVideoSync failed to increment the sync counter.";
        useSoftware = true;
      }

      if (useSoftware) {
        double remaining =
            (1000.f / 60.f) - (TimeStamp::Now() - lastVsync).ToMilliseconds();
        if (remaining > 0) {
          AUTO_PROFILER_THREAD_SLEEP;
          PlatformThread::Sleep((int)remaining);
        }
      }

      lastVsync = TimeStamp::Now();
      TimeStamp outputTime = lastVsync + GetVsyncRate();
      NotifyVsync(lastVsync, outputTime);
    }
  }

  void Cleanup() {
    MOZ_ASSERT(!NS_IsMainThread());

    mGLContext = nullptr;
    if (mXDisplay) XCloseDisplay(mXDisplay);
  }

  // Owned by the vsync thread.
  RefPtr<gl::GLContextGLX> mGLContext;
  _XDisplay* mXDisplay;
  Monitor mSetupLock MOZ_UNANNOTATED;
  base::Thread mVsyncThread;
  RefPtr<Runnable> mVsyncTask;
  Monitor mVsyncEnabledLock MOZ_UNANNOTATED;
  bool mVsyncEnabled;
};

class XrandrSoftwareVsyncSource final
    : public mozilla::gfx::SoftwareVsyncSource {
 public:
  XrandrSoftwareVsyncSource() : SoftwareVsyncSource(ComputeVsyncRate()) {
    MOZ_ASSERT(NS_IsMainThread());

    GdkScreen* defaultScreen = gdk_screen_get_default();
    g_signal_connect(defaultScreen, "monitors-changed",
                     G_CALLBACK(monitors_changed), this);
  }

 private:
  // Request the current refresh rate via xrandr. It is hard to find the
  // "correct" one, thus choose the highest one, assuming this will usually
  // give the best user experience.
  static mozilla::TimeDuration ComputeVsyncRate() {
    struct _XDisplay* dpy = gdk_x11_get_default_xdisplay();

    // Use the default software refresh rate as lower bound. Allowing lower
    // rates makes a bunch of tests start to fail on CI. The main goal of this
    // VsyncSource is to support refresh rates greater than the default one.
    double highestRefreshRate = gfxPlatform::GetSoftwareVsyncRate();

    // When running on remote X11 the xrandr version may be stuck on an
    // ancient version. There are still setups using remote X11 out there, so
    // make sure we don't crash.
    int eventBase, errorBase, major, minor;
    if (XRRQueryExtension(dpy, &eventBase, &errorBase) &&
        XRRQueryVersion(dpy, &major, &minor) &&
        (major > 1 || (major == 1 && minor >= 3))) {
      Window root = gdk_x11_get_default_root_xwindow();
      XRRScreenResources* res = XRRGetScreenResourcesCurrent(dpy, root);

      if (res) {
        // We can't use refresh rates far below the default one (60Hz) because
        // otherwise random CI tests start to fail. However, many users have
        // screens just below the default rate, e.g. 59.95Hz. So slightly
        // decrease the lower bound.
        highestRefreshRate -= 1.0;

        for (int i = 0; i < res->noutput; i++) {
          XRROutputInfo* outputInfo =
              XRRGetOutputInfo(dpy, res, res->outputs[i]);
          if (outputInfo) {
            if (outputInfo->crtc) {
              XRRCrtcInfo* crtcInfo =
                  XRRGetCrtcInfo(dpy, res, outputInfo->crtc);
              if (crtcInfo) {
                for (int j = 0; j < res->nmode; j++) {
                  if (res->modes[j].id == crtcInfo->mode) {
                    double refreshRate = mode_refresh(&res->modes[j]);
                    if (refreshRate > highestRefreshRate) {
                      highestRefreshRate = refreshRate;
                    }
                    break;
                  }
                }

                XRRFreeCrtcInfo(crtcInfo);
              }
            }

            XRRFreeOutputInfo(outputInfo);
          }
        }
      }
      XRRFreeScreenResources(res);
    }

    const double rate = 1000.0 / highestRefreshRate;
    return mozilla::TimeDuration::FromMilliseconds(rate);
  }

  static void monitors_changed(GdkScreen* aScreen, gpointer aClosure) {
    XrandrSoftwareVsyncSource* self =
        static_cast<XrandrSoftwareVsyncSource*>(aClosure);
    self->SetVsyncRate(ComputeVsyncRate());
  }

  // from xrandr.c
  static double mode_refresh(const XRRModeInfo* mode_info) {
    double rate;
    double vTotal = mode_info->vTotal;

    if (mode_info->modeFlags & RR_DoubleScan) {
      /* doublescan doubles the number of lines */
      vTotal *= 2;
    }

    if (mode_info->modeFlags & RR_Interlace) {
      /* interlace splits the frame into two fields */
      /* the field rate is what is typically reported by monitors */
      vTotal /= 2;
    }

    if (mode_info->hTotal && vTotal) {
      rate = ((double)mode_info->dotClock /
              ((double)mode_info->hTotal * (double)vTotal));
    } else {
      rate = 0;
    }
    return rate;
  }
};
#endif

already_AddRefed<gfx::VsyncSource>
gfxPlatformGtk::CreateGlobalHardwareVsyncSource() {
#ifdef MOZ_X11
  if (IsHeadless() || IsWaylandDisplay()) {
    // On Wayland we can not create a global hardware based vsync source, thus
    // use a software based one here. We create window specific ones later.
    return GetSoftwareVsyncSource();
  }

  nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
  nsString windowProtocol;
  gfxInfo->GetWindowProtocol(windowProtocol);
  bool isXwayland = windowProtocol.Find(u"xwayland") != -1;
  nsString adapterDriverVendor;
  gfxInfo->GetAdapterDriverVendor(adapterDriverVendor);
  bool isMesa = adapterDriverVendor.Find(u"mesa") != -1;

  // Only use GLX vsync when the OpenGL compositor / WebRender is being used.
  // The extra cost of initializing a GLX context while blocking the main thread
  // is not worth it when using basic composition. Do not use it on Xwayland, as
  // Xwayland will give us a software timer as we are listening for the root
  // window, which does not have a Wayland equivalent. Don't call
  // gl::sGLXLibrary.SupportsVideoSync() when EGL is used as NVIDIA drivers
  // refuse to use EGL GL context when GLX was initialized first and fail
  // silently.
  if (gfxConfig::IsEnabled(Feature::HW_COMPOSITING) && !isXwayland &&
      (!gfxVars::UseEGL() || isMesa) &&
      gl::sGLXLibrary.SupportsVideoSync(DefaultXDisplay())) {
    RefPtr<GtkVsyncSource> vsyncSource = new GtkVsyncSource();
    if (!vsyncSource->Setup()) {
      NS_WARNING("Failed to setup GLContext, falling back to software vsync.");
      return GetSoftwareVsyncSource();
    }
    return vsyncSource.forget();
  }

  RefPtr<VsyncSource> softwareVsync = new XrandrSoftwareVsyncSource();
  return softwareVsync.forget();
#else
  return GetSoftwareVsyncSource();
#endif
}

void gfxPlatformGtk::BuildContentDeviceData(ContentDeviceData* aOut) {
  gfxPlatform::BuildContentDeviceData(aOut);

  aOut->cmsOutputProfileData() = GetPlatformCMSOutputProfileData();
}