Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3902 insertions, 0 deletions

diff --git a/gfx/thebes/gfxPlatform.cpp b/gfx/thebes/gfxPlatform.cpp
new file mode 100644
index 0000000000..c9293bd0db
--- /dev/null
+++ b/gfx/thebes/gfxPlatform.cpp
@@ -0,0 +1,3902 @@
+/* -*- 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/. */
+
+#include "mozilla/FontPropertyTypes.h"
+#include "mozilla/RDDProcessManager.h"
+#include "mozilla/image/ImageMemoryReporter.h"
+#include "mozilla/layers/CompositorManagerChild.h"
+#include "mozilla/layers/CompositorThread.h"
+#include "mozilla/layers/ImageBridgeChild.h"
+#include "mozilla/layers/ISurfaceAllocator.h"  // for GfxMemoryImageReporter
+#include "mozilla/layers/CompositorBridgeChild.h"
+#include "mozilla/layers/RemoteTextureMap.h"
+#include "mozilla/layers/VideoBridgeParent.h"
+#include "mozilla/webrender/RenderThread.h"
+#include "mozilla/webrender/WebRenderAPI.h"
+#include "mozilla/webrender/webrender_ffi.h"
+#include "mozilla/gfx/BuildConstants.h"
+#include "mozilla/gfx/gfxConfigManager.h"
+#include "mozilla/gfx/gfxVars.h"
+#include "mozilla/gfx/GPUProcessManager.h"
+#include "mozilla/gfx/GraphicsMessages.h"
+#include "mozilla/gfx/CanvasManagerChild.h"
+#include "mozilla/gfx/CanvasManagerParent.h"
+#include "mozilla/gfx/CanvasRenderThread.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/EnumTypeTraits.h"
+#include "mozilla/StaticPrefs_accessibility.h"
+#include "mozilla/StaticPrefs_apz.h"
+#include "mozilla/StaticPrefs_bidi.h"
+#include "mozilla/StaticPrefs_canvas.h"
+#include "mozilla/StaticPrefs_gfx.h"
+#include "mozilla/StaticPrefs_layout.h"
+#include "mozilla/StaticPrefs_layers.h"
+#include "mozilla/StaticPrefs_media.h"
+#include "mozilla/StaticPrefs_privacy.h"
+#include "mozilla/StaticPrefs_webgl.h"
+#include "mozilla/StaticPrefs_widget.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/Unused.h"
+#include "mozilla/IntegerPrintfMacros.h"
+#include "mozilla/Base64.h"
+#include "mozilla/VsyncDispatcher.h"
+
+#include "mozilla/Logging.h"
+#include "mozilla/Components.h"
+#include "nsAppRunner.h"
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsCSSProps.h"
+#include "nsContentUtils.h"
+
+#include "gfxCrashReporterUtils.h"
+#include "gfxPlatform.h"
+#include "gfxPlatformWorker.h"
+
+#include "gfxBlur.h"
+#include "gfxEnv.h"
+#include "gfxTextRun.h"
+#include "gfxUserFontSet.h"
+#include "gfxConfig.h"
+#include "GfxDriverInfo.h"
+#include "VRProcessManager.h"
+#include "VRThread.h"
+
+#ifdef XP_WIN
+#  include <process.h>
+#  define getpid _getpid
+#else
+#  include <unistd.h>
+#endif
+
+#include "nsXULAppAPI.h"
+#include "nsIXULAppInfo.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsDirectoryServiceDefs.h"
+
+#if defined(XP_WIN)
+#  include "gfxWindowsPlatform.h"
+#  include "mozilla/widget/WinWindowOcclusionTracker.h"
+#elif defined(XP_MACOSX)
+#  include "gfxPlatformMac.h"
+#  include "gfxQuartzSurface.h"
+#  include "nsCocoaFeatures.h"
+#elif defined(MOZ_WIDGET_GTK)
+#  include "gfxPlatformGtk.h"
+#elif defined(ANDROID)
+#  include "gfxAndroidPlatform.h"
+#endif
+#if defined(MOZ_WIDGET_ANDROID)
+#  include "mozilla/jni/Utils.h"  // for IsFennec
+#endif
+
+#ifdef XP_WIN
+#  include "mozilla/WindowsVersion.h"
+#  include "WinUtils.h"
+#endif
+
+#include "nsGkAtoms.h"
+#include "gfxPlatformFontList.h"
+#include "gfxContext.h"
+#include "gfxImageSurface.h"
+#include "nsUnicodeProperties.h"
+#include "harfbuzz/hb.h"
+#include "gfxGraphiteShaper.h"
+#include "gfx2DGlue.h"
+#include "gfxGradientCache.h"
+#include "gfxUtils.h"  // for NextPowerOfTwo
+#include "gfxFontMissingGlyphs.h"
+
+#include "nsExceptionHandler.h"
+#include "nsServiceManagerUtils.h"
+#include "nsTArray.h"
+#include "nsIObserverService.h"
+#include "mozilla/widget/Screen.h"
+#include "mozilla/widget/ScreenManager.h"
+#include "MainThreadUtils.h"
+
+#include "nsWeakReference.h"
+
+#include "cairo.h"
+#include "qcms.h"
+
+#include "imgITools.h"
+
+#include "nsCRT.h"
+#include "GLContext.h"
+#include "GLContextProvider.h"
+#include "mozilla/gfx/Logging.h"
+
+#ifdef __GNUC__
+#  pragma GCC diagnostic push
+#  pragma GCC diagnostic ignored "-Wshadow"
+#endif
+#include "skia/include/core/SkGraphics.h"
+#ifdef MOZ_ENABLE_FREETYPE
+#  include "skia/include/ports/SkTypeface_cairo.h"
+#endif
+#include "mozilla/gfx/SkMemoryReporter.h"
+#ifdef __GNUC__
+#  pragma GCC diagnostic pop  // -Wshadow
+#endif
+static const uint32_t kDefaultGlyphCacheSize = -1;
+
+#include "mozilla/Preferences.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/Mutex.h"
+
+#include "nsAlgorithm.h"
+#include "nsIGfxInfo.h"
+#include "nsIXULRuntime.h"
+#include "VsyncSource.h"
+#include "SoftwareVsyncSource.h"
+#include "nscore.h"  // for NS_FREE_PERMANENT_DATA
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/TouchEvent.h"
+#include "gfxVR.h"
+#include "VRManager.h"
+#include "VRManagerChild.h"
+#include "mozilla/gfx/GPUParent.h"
+#include "prsystem.h"
+
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/SourceSurfaceCairo.h"
+
+using namespace mozilla;
+using namespace mozilla::layers;
+using namespace mozilla::gl;
+using namespace mozilla::gfx;
+
+gfxPlatform* gPlatform = nullptr;
+static bool gEverInitialized = false;
+
+const ContentDeviceData* gContentDeviceInitData = nullptr;
+
+Atomic<bool, MemoryOrdering::ReleaseAcquire> gfxPlatform::gCMSInitialized;
+CMSMode gfxPlatform::gCMSMode = CMSMode::Off;
+
+// These two may point to the same profile
+qcms_profile* gfxPlatform::gCMSOutputProfile = nullptr;
+qcms_profile* gfxPlatform::gCMSsRGBProfile = nullptr;
+
+qcms_transform* gfxPlatform::gCMSRGBTransform = nullptr;
+qcms_transform* gfxPlatform::gCMSInverseRGBTransform = nullptr;
+qcms_transform* gfxPlatform::gCMSRGBATransform = nullptr;
+qcms_transform* gfxPlatform::gCMSBGRATransform = nullptr;
+
+/// This override of the LogForwarder, initially used for the critical graphics
+/// errors, is sending the log to the crash annotations as well, but only
+/// if the capacity set with the method below is >= 2.  We always retain the
+/// very first critical message, and the latest capacity-1 messages are
+/// rotated through. Note that we don't expect the total number of times
+/// this gets called to be large - it is meant for critical errors only.
+
+class CrashStatsLogForwarder : public mozilla::gfx::LogForwarder {
+ public:
+  explicit CrashStatsLogForwarder(CrashReporter::Annotation aKey);
+  void Log(const std::string& aString) override;
+  void CrashAction(LogReason aReason) override;
+  bool UpdateStringsVector(const std::string& aString) override;
+
+  LoggingRecord LoggingRecordCopy() override;
+
+  void SetCircularBufferSize(uint32_t aCapacity);
+
+ private:
+  // Helper for the Log()
+  void UpdateCrashReport();
+
+ private:
+  LoggingRecord mBuffer;
+  CrashReporter::Annotation mCrashCriticalKey;
+  uint32_t mMaxCapacity;
+  int32_t mIndex;
+  Mutex mMutex MOZ_UNANNOTATED;
+};
+
+CrashStatsLogForwarder::CrashStatsLogForwarder(CrashReporter::Annotation aKey)
+    : mBuffer(),
+      mCrashCriticalKey(aKey),
+      mMaxCapacity(0),
+      mIndex(-1),
+      mMutex("CrashStatsLogForwarder") {}
+
+void CrashStatsLogForwarder::SetCircularBufferSize(uint32_t aCapacity) {
+  MutexAutoLock lock(mMutex);
+
+  mMaxCapacity = aCapacity;
+  mBuffer.reserve(static_cast<size_t>(aCapacity));
+}
+
+LoggingRecord CrashStatsLogForwarder::LoggingRecordCopy() {
+  MutexAutoLock lock(mMutex);
+  return mBuffer;
+}
+
+bool CrashStatsLogForwarder::UpdateStringsVector(const std::string& aString) {
+  // We want at least the first one and the last one.  Otherwise, no point.
+  if (mMaxCapacity < 2) {
+    return false;
+  }
+
+  mIndex += 1;
+  MOZ_ASSERT(mIndex >= 0);
+
+  // index will count 0, 1, 2, ..., max-1, 1, 2, ..., max-1, 1, 2, ...
+  int32_t index = mIndex ? (mIndex - 1) % (mMaxCapacity - 1) + 1 : 0;
+  MOZ_ASSERT(index >= 0 && index < (int32_t)mMaxCapacity);
+  MOZ_ASSERT(index <= mIndex && index <= (int32_t)mBuffer.size());
+
+  double tStamp = (TimeStamp::NowLoRes() - TimeStamp::ProcessCreation())
+                      .ToSecondsSigDigits();
+
+  // Checking for index >= mBuffer.size(), rather than index == mBuffer.size()
+  // just out of paranoia, but we know index <= mBuffer.size().
+  LoggingRecordEntry newEntry(mIndex, aString, tStamp);
+  if (index >= static_cast<int32_t>(mBuffer.size())) {
+    mBuffer.push_back(newEntry);
+  } else {
+    mBuffer[index] = newEntry;
+  }
+  return true;
+}
+
+void CrashStatsLogForwarder::UpdateCrashReport() {
+  std::stringstream message;
+  std::string logAnnotation;
+
+  switch (XRE_GetProcessType()) {
+    case GeckoProcessType_Default:
+      logAnnotation = "|[";
+      break;
+    case GeckoProcessType_Content:
+      logAnnotation = "|[C";
+      break;
+    case GeckoProcessType_GPU:
+      logAnnotation = "|[G";
+      break;
+    default:
+      logAnnotation = "|[X";
+      break;
+  }
+
+  for (auto& it : mBuffer) {
+    message << logAnnotation << std::get<0>(it) << "]" << std::get<1>(it)
+            << " (t=" << std::get<2>(it) << ") ";
+  }
+
+  nsCString reportString(message.str().c_str());
+  nsresult annotated =
+      CrashReporter::AnnotateCrashReport(mCrashCriticalKey, reportString);
+
+  if (annotated != NS_OK) {
+    printf("Crash Annotation %s: %s",
+           CrashReporter::AnnotationToString(mCrashCriticalKey),
+           message.str().c_str());
+  }
+}
+
+class LogForwarderEvent : public Runnable {
+  virtual ~LogForwarderEvent() = default;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(LogForwarderEvent, Runnable)
+
+  explicit LogForwarderEvent(const nsCString& aMessage)
+      : mozilla::Runnable("LogForwarderEvent"), mMessage(aMessage) {}
+
+  NS_IMETHOD Run() override {
+    MOZ_ASSERT(NS_IsMainThread() &&
+               (XRE_IsContentProcess() || XRE_IsGPUProcess()));
+
+    if (XRE_IsContentProcess()) {
+      dom::ContentChild* cc = dom::ContentChild::GetSingleton();
+      Unused << cc->SendGraphicsError(mMessage);
+    } else if (XRE_IsGPUProcess()) {
+      GPUParent* gp = GPUParent::GetSingleton();
+      Unused << gp->SendGraphicsError(mMessage);
+    }
+
+    return NS_OK;
+  }
+
+ protected:
+  nsCString mMessage;
+};
+
+void CrashStatsLogForwarder::Log(const std::string& aString) {
+  MutexAutoLock lock(mMutex);
+
+  if (UpdateStringsVector(aString)) {
+    UpdateCrashReport();
+  }
+
+  // Add it to the parent strings
+  if (!XRE_IsParentProcess()) {
+    nsCString stringToSend(aString.c_str());
+    if (NS_IsMainThread()) {
+      if (XRE_IsContentProcess()) {
+        dom::ContentChild* cc = dom::ContentChild::GetSingleton();
+        Unused << cc->SendGraphicsError(stringToSend);
+      } else if (XRE_IsGPUProcess()) {
+        GPUParent* gp = GPUParent::GetSingleton();
+        Unused << gp->SendGraphicsError(stringToSend);
+      }
+    } else {
+      nsCOMPtr<nsIRunnable> r1 = new LogForwarderEvent(stringToSend);
+      NS_DispatchToMainThread(r1);
+    }
+  }
+}
+
+class CrashTelemetryEvent : public Runnable {
+  virtual ~CrashTelemetryEvent() = default;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(CrashTelemetryEvent, Runnable)
+
+  explicit CrashTelemetryEvent(uint32_t aReason)
+      : mozilla::Runnable("CrashTelemetryEvent"), mReason(aReason) {}
+
+  NS_IMETHOD Run() override {
+    MOZ_ASSERT(NS_IsMainThread());
+    Telemetry::Accumulate(Telemetry::GFX_CRASH, mReason);
+    return NS_OK;
+  }
+
+ protected:
+  uint32_t mReason;
+};
+
+void CrashStatsLogForwarder::CrashAction(LogReason aReason) {
+#ifndef RELEASE_OR_BETA
+  // Non-release builds crash by default, but will use telemetry
+  // if this environment variable is present.
+  static bool useTelemetry = gfxEnv::MOZ_GFX_CRASH_TELEMETRY();
+#else
+  // Release builds use telemetry by default, but will crash instead
+  // if this environment variable is present.
+  static bool useTelemetry = !gfxEnv::MOZ_GFX_CRASH_MOZ_CRASH();
+#endif
+
+  if (useTelemetry) {
+    // The callers need to assure that aReason is in the range
+    // that the telemetry call below supports.
+    if (NS_IsMainThread()) {
+      Telemetry::Accumulate(Telemetry::GFX_CRASH, (uint32_t)aReason);
+    } else {
+      nsCOMPtr<nsIRunnable> r1 = new CrashTelemetryEvent((uint32_t)aReason);
+      NS_DispatchToMainThread(r1);
+    }
+  } else {
+    // ignoring aReason, we can get the information we need from the stack
+    MOZ_CRASH("GFX_CRASH");
+  }
+}
+
+#define GFX_DOWNLOADABLE_FONTS_ENABLED "gfx.downloadable_fonts.enabled"
+
+#define GFX_PREF_FALLBACK_USE_CMAPS \
+  "gfx.font_rendering.fallback.always_use_cmaps"
+
+#define GFX_PREF_OPENTYPE_SVG "gfx.font_rendering.opentype_svg.enabled"
+
+#define GFX_PREF_WORD_CACHE_CHARLIMIT "gfx.font_rendering.wordcache.charlimit"
+#define GFX_PREF_WORD_CACHE_MAXENTRIES "gfx.font_rendering.wordcache.maxentries"
+
+#define GFX_PREF_GRAPHITE_SHAPING "gfx.font_rendering.graphite.enabled"
+#if defined(XP_MACOSX)
+#  define GFX_PREF_CORETEXT_SHAPING "gfx.font_rendering.coretext.enabled"
+#endif
+
+#define FONT_VARIATIONS_PREF "layout.css.font-variations.enabled"
+
+static const char* kObservedPrefs[] = {"gfx.downloadable_fonts.",
+                                       "gfx.font_rendering.", nullptr};
+
+static void FontPrefChanged(const char* aPref, void* aData) {
+  MOZ_ASSERT(aPref);
+  NS_ASSERTION(gfxPlatform::GetPlatform(), "the singleton instance has gone");
+  gfxPlatform::GetPlatform()->FontsPrefsChanged(aPref);
+}
+
+void gfxPlatform::OnMemoryPressure(layers::MemoryPressureReason aWhy) {
+  Factory::PurgeAllCaches();
+  gfxGradientCache::PurgeAllCaches();
+  gfxFontMissingGlyphs::Purge();
+  PurgeSkiaFontCache();
+  if (XRE_IsParentProcess()) {
+    layers::CompositorManagerChild* manager =
+        CompositorManagerChild::GetInstance();
+    if (manager) {
+      manager->SendNotifyMemoryPressure();
+    }
+  }
+}
+
+gfxPlatform::gfxPlatform()
+    : mAzureCanvasBackendCollector(this, &gfxPlatform::GetAzureBackendInfo),
+      mApzSupportCollector(this, &gfxPlatform::GetApzSupportInfo),
+      mFrameStatsCollector(this, &gfxPlatform::GetFrameStats),
+      mCMSInfoCollector(this, &gfxPlatform::GetCMSSupportInfo),
+      mDisplayInfoCollector(this, &gfxPlatform::GetDisplayInfo),
+      mOverlayInfoCollector(this, &gfxPlatform::GetOverlayInfo),
+      mSwapChainInfoCollector(this, &gfxPlatform::GetSwapChainInfo),
+      mCompositorBackend(layers::LayersBackend::LAYERS_NONE),
+      mScreenDepth(0) {
+  mAllowDownloadableFonts = UNINITIALIZED_VALUE;
+
+  InitBackendPrefs(GetBackendPrefs());
+  VRManager::ManagerInit();
+}
+
+gfxPlatform* gfxPlatform::GetPlatform() {
+  if (!gPlatform) {
+    MOZ_RELEASE_ASSERT(!XRE_IsContentProcess(),
+                       "Content Process should have called InitChild() before "
+                       "first GetPlatform()");
+    Init();
+  }
+  return gPlatform;
+}
+
+bool gfxPlatform::Initialized() { return !!gPlatform; }
+
+/* static */
+void gfxPlatform::InitChild(const ContentDeviceData& aData) {
+  MOZ_ASSERT(XRE_IsContentProcess());
+  MOZ_RELEASE_ASSERT(!gPlatform,
+                     "InitChild() should be called before first GetPlatform()");
+  // Make the provided initial ContentDeviceData available to the init
+  // routines, so they don't have to do a sync request from the parent.
+  gContentDeviceInitData = &aData;
+  Init();
+  gContentDeviceInitData = nullptr;
+}
+
+#define WR_DEBUG_PREF "gfx.webrender.debug"
+
+static void SwapIntervalPrefChangeCallback(const char* aPrefName, void*) {
+  bool egl = Preferences::GetBool("gfx.swap-interval.egl", false);
+  bool glx = Preferences::GetBool("gfx.swap-interval.glx", false);
+  gfxVars::SetSwapIntervalEGL(egl);
+  gfxVars::SetSwapIntervalGLX(glx);
+}
+
+static void WebRendeProfilerUIPrefChangeCallback(const char* aPrefName, void*) {
+  nsCString uiString;
+  if (NS_SUCCEEDED(Preferences::GetCString("gfx.webrender.debug.profiler-ui",
+                                           uiString))) {
+    gfxVars::SetWebRenderProfilerUI(uiString);
+  }
+}
+
+// List of boolean dynamic parameter for WebRender.
+//
+// The parameters in this list are:
+//  - The pref name.
+//  - The BoolParameter enum variant (see webrender_api/src/lib.rs)
+//  - A default value.
+#define WR_BOOL_PARAMETER_LIST(_)                                     \
+  _("gfx.webrender.batched-texture-uploads",                          \
+    wr::BoolParameter::BatchedUploads, true)                          \
+  _("gfx.webrender.draw-calls-for-texture-copy",                      \
+    wr::BoolParameter::DrawCallsForTextureCopy, true)                 \
+  _("gfx.webrender.pbo-uploads", wr::BoolParameter::PboUploads, true) \
+  _("gfx.webrender.multithreading", wr::BoolParameter::Multithreading, true)
+
+static void WebRenderBoolParameterChangeCallback(const char*, void*) {
+  uint32_t bits = 0;
+
+#define WR_BOOL_PARAMETER(name, key, default_val) \
+  if (Preferences::GetBool(name, default_val)) {  \
+    bits |= 1 << (uint32_t)key;                   \
+  }
+
+  WR_BOOL_PARAMETER_LIST(WR_BOOL_PARAMETER)
+#undef WR_BOOL_PARAMETER
+
+  gfx::gfxVars::SetWebRenderBoolParameters(bits);
+}
+
+static void RegisterWebRenderBoolParamCallback() {
+#define WR_BOOL_PARAMETER(name, _key, _default_val) \
+  Preferences::RegisterCallback(WebRenderBoolParameterChangeCallback, name);
+
+  WR_BOOL_PARAMETER_LIST(WR_BOOL_PARAMETER)
+#undef WR_BOOL_PARAMETER
+
+  WebRenderBoolParameterChangeCallback(nullptr, nullptr);
+}
+
+static void WebRenderDebugPrefChangeCallback(const char* aPrefName, void*) {
+  wr::DebugFlags flags{0};
+#define GFX_WEBRENDER_DEBUG(suffix, bit)                   \
+  if (Preferences::GetBool(WR_DEBUG_PREF suffix, false)) { \
+    flags |= (bit);                                        \
+  }
+
+  GFX_WEBRENDER_DEBUG(".profiler", wr::DebugFlags::PROFILER_DBG)
+  GFX_WEBRENDER_DEBUG(".render-targets", wr::DebugFlags::RENDER_TARGET_DBG)
+  GFX_WEBRENDER_DEBUG(".texture-cache", wr::DebugFlags::TEXTURE_CACHE_DBG)
+  GFX_WEBRENDER_DEBUG(".gpu-time-queries", wr::DebugFlags::GPU_TIME_QUERIES)
+  GFX_WEBRENDER_DEBUG(".gpu-sample-queries", wr::DebugFlags::GPU_SAMPLE_QUERIES)
+  GFX_WEBRENDER_DEBUG(".disable-batching", wr::DebugFlags::DISABLE_BATCHING)
+  GFX_WEBRENDER_DEBUG(".epochs", wr::DebugFlags::EPOCHS)
+  GFX_WEBRENDER_DEBUG(".smart-profiler", wr::DebugFlags::SMART_PROFILER)
+  GFX_WEBRENDER_DEBUG(".echo-driver-messages",
+                      wr::DebugFlags::ECHO_DRIVER_MESSAGES)
+  GFX_WEBRENDER_DEBUG(".show-overdraw", wr::DebugFlags::SHOW_OVERDRAW)
+  GFX_WEBRENDER_DEBUG(".gpu-cache", wr::DebugFlags::GPU_CACHE_DBG)
+  GFX_WEBRENDER_DEBUG(".texture-cache.clear-evicted",
+                      wr::DebugFlags::TEXTURE_CACHE_DBG_CLEAR_EVICTED)
+  GFX_WEBRENDER_DEBUG(".picture-caching", wr::DebugFlags::PICTURE_CACHING_DBG)
+  GFX_WEBRENDER_DEBUG(".force-picture-invalidation",
+                      wr::DebugFlags::FORCE_PICTURE_INVALIDATION)
+  GFX_WEBRENDER_DEBUG(".primitives", wr::DebugFlags::PRIMITIVE_DBG)
+  // Bit 18 is for the zoom display, which requires the mouse position and thus
+  // currently only works in wrench.
+  GFX_WEBRENDER_DEBUG(".small-screen", wr::DebugFlags::SMALL_SCREEN)
+  GFX_WEBRENDER_DEBUG(".disable-opaque-pass",
+                      wr::DebugFlags::DISABLE_OPAQUE_PASS)
+  GFX_WEBRENDER_DEBUG(".disable-alpha-pass", wr::DebugFlags::DISABLE_ALPHA_PASS)
+  GFX_WEBRENDER_DEBUG(".disable-clip-masks", wr::DebugFlags::DISABLE_CLIP_MASKS)
+  GFX_WEBRENDER_DEBUG(".disable-text-prims", wr::DebugFlags::DISABLE_TEXT_PRIMS)
+  GFX_WEBRENDER_DEBUG(".disable-gradient-prims",
+                      wr::DebugFlags::DISABLE_GRADIENT_PRIMS)
+  GFX_WEBRENDER_DEBUG(".obscure-images", wr::DebugFlags::OBSCURE_IMAGES)
+  GFX_WEBRENDER_DEBUG(".glyph-flashing", wr::DebugFlags::GLYPH_FLASHING)
+  GFX_WEBRENDER_DEBUG(".capture-profiler", wr::DebugFlags::PROFILER_CAPTURE)
+  GFX_WEBRENDER_DEBUG(".window-visibility",
+                      wr::DebugFlags::WINDOW_VISIBILITY_DBG)
+  GFX_WEBRENDER_DEBUG(".restrict-blob-size", wr::DebugFlags::RESTRICT_BLOB_SIZE)
+#undef GFX_WEBRENDER_DEBUG
+  gfx::gfxVars::SetWebRenderDebugFlags(flags.bits);
+}
+
+static void WebRenderQualityPrefChangeCallback(const char* aPref, void*) {
+  gfxPlatform::GetPlatform()->UpdateForceSubpixelAAWherePossible();
+}
+
+static void WebRenderBatchingPrefChangeCallback(const char* aPrefName, void*) {
+  uint32_t count = Preferences::GetUint(
+      StaticPrefs::GetPrefName_gfx_webrender_batching_lookback(), 10);
+
+  gfx::gfxVars::SetWebRenderBatchingLookback(count);
+}
+
+static void WebRenderBlobTileSizePrefChangeCallback(const char* aPrefName,
+                                                    void*) {
+  uint32_t tileSize = Preferences::GetUint(
+      StaticPrefs::GetPrefName_gfx_webrender_blob_tile_size(), 256);
+  gfx::gfxVars::SetWebRenderBlobTileSize(tileSize);
+}
+
+static void WebRenderUploadThresholdPrefChangeCallback(const char* aPrefName,
+                                                       void*) {
+  int value = Preferences::GetInt(
+      StaticPrefs::GetPrefName_gfx_webrender_batched_upload_threshold(),
+      512 * 512);
+
+  gfxVars::SetWebRenderBatchedUploadThreshold(value);
+}
+
+static uint32_t GetSkiaGlyphCacheSize() {
+  // Only increase font cache size on non-android to save memory.
+#if !defined(MOZ_WIDGET_ANDROID)
+  // 10mb as the default pref cache size on desktop due to talos perf tweaking.
+  // Chromium uses 20mb and skia default uses 2mb.
+  // We don't need to change the font cache count since we usually
+  // cache thrash due to asian character sets in talos.
+  // Only increase memory on the content process
+  uint32_t cacheSize =
+      StaticPrefs::gfx_content_skia_font_cache_size_AtStartup() * 1024 * 1024;
+  if (mozilla::BrowserTabsRemoteAutostart()) {
+    return XRE_IsContentProcess() ? cacheSize : kDefaultGlyphCacheSize;
+  }
+
+  return cacheSize;
+#else
+  return kDefaultGlyphCacheSize;
+#endif  // MOZ_WIDGET_ANDROID
+}
+
+class WebRenderMemoryReporter final : public nsIMemoryReporter {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIMEMORYREPORTER
+
+ private:
+  ~WebRenderMemoryReporter() = default;
+};
+
+// Memory reporter for WebRender.
+//
+// The reporting within WebRender is manual and incomplete. We could do a much
+// more thorough job by depending on the malloc_size_of crate, but integrating
+// that into WebRender is tricky [1].
+//
+// So the idea is to start with manual reporting for the large allocations
+// detected by DMD, and see how much that can cover in practice (which may
+// require a few rounds of iteration). If that approach turns out to be
+// fundamentally insufficient, we can either duplicate more of the
+// malloc_size_of functionality in WebRender, or deal with the complexity of a
+// gecko-only crate dependency.
+//
+// [1] See https://bugzilla.mozilla.org/show_bug.cgi?id=1480293#c1
+struct WebRenderMemoryReporterHelper {
+  WebRenderMemoryReporterHelper(nsIHandleReportCallback* aCallback,
+                                nsISupports* aData)
+      : mCallback(aCallback), mData(aData) {}
+  nsCOMPtr<nsIHandleReportCallback> mCallback;
+  nsCOMPtr<nsISupports> mData;
+
+  void Report(size_t aBytes, const char* aName) const {
+    nsPrintfCString path("explicit/gfx/webrender/%s", aName);
+    nsCString desc("CPU heap memory used by WebRender"_ns);
+    ReportInternal(aBytes, path, desc, nsIMemoryReporter::KIND_HEAP);
+  }
+
+  void ReportTexture(size_t aBytes, const char* aName) const {
+    nsPrintfCString path("gfx/webrender/textures/%s", aName);
+    nsCString desc("GPU texture memory used by WebRender"_ns);
+    ReportInternal(aBytes, path, desc, nsIMemoryReporter::KIND_OTHER);
+  }
+
+  void ReportTotalGPUBytes(size_t aBytes) const {
+    nsCString path("gfx/webrender/total-gpu-bytes"_ns);
+    nsCString desc(nsLiteralCString(
+        "Total GPU bytes used by WebRender (should match textures/ sum)"));
+    ReportInternal(aBytes, path, desc, nsIMemoryReporter::KIND_OTHER);
+  }
+
+  void ReportInternal(size_t aBytes, nsACString& aPath, nsACString& aDesc,
+                      int32_t aKind) const {
+    // Generally, memory reporters pass the empty string as the process name to
+    // indicate "current process". However, if we're using a GPU process, the
+    // measurements will actually take place in that process, and it's easier to
+    // just note that here rather than trying to invoke the memory reporter in
+    // the GPU process.
+    nsAutoCString processName;
+    if (gfxConfig::IsEnabled(Feature::GPU_PROCESS)) {
+      GPUParent::GetGPUProcessName(processName);
+    }
+
+    mCallback->Callback(processName, aPath, aKind,
+                        nsIMemoryReporter::UNITS_BYTES, aBytes, aDesc, mData);
+  }
+};
+
+static void FinishAsyncMemoryReport() {
+  nsCOMPtr<nsIMemoryReporterManager> imgr =
+      do_GetService("@mozilla.org/memory-reporter-manager;1");
+  if (imgr) {
+    imgr->EndReport();
+  }
+}
+
+// clang-format off
+// (For some reason, clang-format gets the second macro right, but totally mangles the first).
+#define REPORT_INTERNER(id)                      \
+  helper.Report(aReport.interning.interners.id, \
+                "interning/" #id "/interners");
+// clang-format on
+
+#define REPORT_DATA_STORE(id)                     \
+  helper.Report(aReport.interning.data_stores.id, \
+                "interning/" #id "/data-stores");
+
+NS_IMPL_ISUPPORTS(WebRenderMemoryReporter, nsIMemoryReporter)
+
+NS_IMETHODIMP
+WebRenderMemoryReporter::CollectReports(nsIHandleReportCallback* aHandleReport,
+                                        nsISupports* aData, bool aAnonymize) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  MOZ_ASSERT(NS_IsMainThread());
+  layers::CompositorManagerChild* manager =
+      CompositorManagerChild::GetInstance();
+  if (!manager) {
+    FinishAsyncMemoryReport();
+    return NS_OK;
+  }
+
+  WebRenderMemoryReporterHelper helper(aHandleReport, aData);
+  manager->SendReportMemory(
+      [=](wr::MemoryReport aReport) {
+        // CPU Memory.
+        helper.Report(aReport.clip_stores, "clip-stores");
+        helper.Report(aReport.gpu_cache_metadata, "gpu-cache/metadata");
+        helper.Report(aReport.gpu_cache_cpu_mirror, "gpu-cache/cpu-mirror");
+        helper.Report(aReport.render_tasks, "render-tasks");
+        helper.Report(aReport.hit_testers, "hit-testers");
+        helper.Report(aReport.fonts, "resource-cache/fonts");
+        helper.Report(aReport.weak_fonts, "resource-cache/weak-fonts");
+        helper.Report(aReport.images, "resource-cache/images");
+        helper.Report(aReport.rasterized_blobs,
+                      "resource-cache/rasterized-blobs");
+        helper.Report(aReport.texture_cache_structures,
+                      "texture-cache/structures");
+        helper.Report(aReport.shader_cache, "shader-cache");
+        helper.Report(aReport.display_list, "display-list");
+        helper.Report(aReport.swgl, "swgl");
+        helper.Report(aReport.upload_staging_memory, "upload-stagin-memory");
+
+        WEBRENDER_FOR_EACH_INTERNER(REPORT_INTERNER);
+        WEBRENDER_FOR_EACH_INTERNER(REPORT_DATA_STORE);
+
+        // GPU Memory.
+        helper.ReportTexture(aReport.gpu_cache_textures, "gpu-cache");
+        helper.ReportTexture(aReport.vertex_data_textures, "vertex-data");
+        helper.ReportTexture(aReport.render_target_textures, "render-targets");
+        helper.ReportTexture(aReport.depth_target_textures, "depth-targets");
+        helper.ReportTexture(aReport.picture_tile_textures, "picture-tiles");
+        helper.ReportTexture(aReport.atlas_textures, "texture-cache/atlas");
+        helper.ReportTexture(aReport.standalone_textures,
+                             "texture-cache/standalone");
+        helper.ReportTexture(aReport.texture_upload_pbos,
+                             "texture-upload-pbos");
+        helper.ReportTexture(aReport.swap_chain, "swap-chains");
+        helper.ReportTexture(aReport.render_texture_hosts,
+                             "render-texture-hosts");
+        helper.ReportTexture(aReport.upload_staging_textures,
+                             "upload-staging-textures");
+
+        FinishAsyncMemoryReport();
+      },
+      [](mozilla::ipc::ResponseRejectReason&& aReason) {
+        FinishAsyncMemoryReport();
+      });
+
+  return NS_OK;
+}
+
+#undef REPORT_INTERNER
+#undef REPORT_DATA_STORE
+
+std::atomic<int8_t> gfxPlatform::sHasVariationFontSupport = -1;
+
+bool gfxPlatform::HasVariationFontSupport() {
+  // We record the status here: 0 for not supported, 1 for supported.
+  if (sHasVariationFontSupport < 0) {
+    // It doesn't actually matter if we race with another thread setting this,
+    // as any thread will set it to the same value.
+#if defined(XP_WIN)
+    sHasVariationFontSupport = gfxWindowsPlatform::CheckVariationFontSupport();
+#elif defined(XP_MACOSX)
+    sHasVariationFontSupport = gfxPlatformMac::CheckVariationFontSupport();
+#elif defined(MOZ_WIDGET_GTK)
+    sHasVariationFontSupport = gfxPlatformGtk::CheckVariationFontSupport();
+#elif defined(ANDROID)
+    sHasVariationFontSupport = gfxAndroidPlatform::CheckVariationFontSupport();
+#else
+#  error "No gfxPlatform implementation available"
+#endif
+  }
+  return sHasVariationFontSupport > 0;
+}
+
+void gfxPlatform::Init() {
+  MOZ_RELEASE_ASSERT(!XRE_IsGPUProcess(), "GFX: Not allowed in GPU process.");
+  MOZ_RELEASE_ASSERT(!XRE_IsRDDProcess(), "GFX: Not allowed in RDD process.");
+  MOZ_RELEASE_ASSERT(NS_IsMainThread(), "GFX: Not in main thread.");
+
+  if (gEverInitialized) {
+    MOZ_CRASH("Already started???");
+  }
+  gEverInitialized = true;
+
+  gfxVars::Initialize();
+
+  gfxConfig::Init();
+
+  if (XRE_IsParentProcess()) {
+    GPUProcessManager::Initialize();
+    RDDProcessManager::Initialize();
+
+    nsCOMPtr<nsIFile> file;
+    nsresult rv = NS_GetSpecialDirectory(NS_GRE_DIR, getter_AddRefs(file));
+    if (NS_FAILED(rv)) {
+      gfxVars::SetGREDirectory(nsString());
+    } else {
+      nsAutoString path;
+      file->GetPath(path);
+      gfxVars::SetGREDirectory(nsString(path));
+    }
+  }
+
+  if (XRE_IsParentProcess()) {
+    nsCOMPtr<nsIFile> profDir;
+    nsresult rv = NS_GetSpecialDirectory(NS_APP_PROFILE_DIR_STARTUP,
+                                         getter_AddRefs(profDir));
+    if (NS_FAILED(rv)) {
+      gfxVars::SetProfDirectory(nsString());
+    } else {
+      nsAutoString path;
+      profDir->GetPath(path);
+      gfxVars::SetProfDirectory(nsString(path));
+    }
+
+    nsAutoCString path;
+    Preferences::GetCString("layers.windowrecording.path", path);
+    gfxVars::SetLayersWindowRecordingPath(path);
+
+    if (gFxREmbedded) {
+      gfxVars::SetFxREmbedded(true);
+    }
+  }
+
+  // Drop a note in the crash report if we end up forcing an option that could
+  // destabilize things.  New items should be appended at the end (of an
+  // existing or in a new section), so that we don't have to know the version to
+  // interpret these cryptic strings.
+  {
+    nsAutoCString forcedPrefs;
+    // D2D prefs
+    forcedPrefs.AppendPrintf(
+        "FP(D%d%d", StaticPrefs::gfx_direct2d_disabled_AtStartup(),
+        StaticPrefs::gfx_direct2d_force_enabled_AtStartup());
+    // Layers prefs
+    forcedPrefs.AppendPrintf(
+        "-L%d%d%d%d",
+        StaticPrefs::layers_amd_switchable_gfx_enabled_AtStartup(),
+        StaticPrefs::layers_acceleration_disabled_AtStartup_DoNotUseDirectly(),
+        StaticPrefs::
+            layers_acceleration_force_enabled_AtStartup_DoNotUseDirectly(),
+        StaticPrefs::layers_d3d11_force_warp_AtStartup());
+    // WebGL prefs
+    forcedPrefs.AppendPrintf(
+        "-W%d%d%d%d%d%d%d", StaticPrefs::webgl_angle_force_d3d11(),
+        StaticPrefs::webgl_angle_force_warp(), StaticPrefs::webgl_disabled(),
+        StaticPrefs::webgl_disable_angle(), StaticPrefs::webgl_dxgl_enabled(),
+        StaticPrefs::webgl_force_enabled(), StaticPrefs::webgl_msaa_force());
+    // Prefs that don't fit into any of the other sections
+    forcedPrefs.AppendPrintf("-T%d%d%d) ",
+                             StaticPrefs::gfx_android_rgb16_force_AtStartup(),
+                             StaticPrefs::gfx_canvas_accelerated(),
+                             StaticPrefs::layers_force_shmem_tiles_AtStartup());
+    ScopedGfxFeatureReporter::AppNote(forcedPrefs);
+  }
+
+  InitMoz2DLogging();
+
+  /* Initialize the GfxInfo service.
+   * Note: we can't call functions on GfxInfo that depend
+   * on gPlatform until after it has been initialized
+   * below. GfxInfo initialization annotates our
+   * crash reports so we want to do it before
+   * we try to load any drivers and do device detection
+   * incase that code crashes. See bug #591561. */
+  nsCOMPtr<nsIGfxInfo> gfxInfo;
+  /* this currently will only succeed on Windows */
+  gfxInfo = components::GfxInfo::Service();
+
+  if (XRE_IsParentProcess()) {
+    // Some gfxVars must be initialized prior gPlatform for coherent results.
+    gfxVars::SetDXInterop2Blocked(IsDXInterop2Blocked());
+    gfxVars::SetDXNV12Blocked(IsDXNV12Blocked());
+    gfxVars::SetDXP010Blocked(IsDXP010Blocked());
+    gfxVars::SetDXP016Blocked(IsDXP016Blocked());
+  }
+
+#if defined(XP_WIN)
+  gPlatform = new gfxWindowsPlatform;
+#elif defined(XP_MACOSX)
+  gPlatform = new gfxPlatformMac;
+#elif defined(MOZ_WIDGET_GTK)
+  gPlatform = new gfxPlatformGtk;
+#elif defined(ANDROID)
+  gPlatform = new gfxAndroidPlatform;
+#else
+#  error "No gfxPlatform implementation available"
+#endif
+  gPlatform->PopulateScreenInfo();
+  gPlatform->InitAcceleration();
+  gPlatform->InitWebRenderConfig();
+
+  gPlatform->InitHardwareVideoConfig();
+  gPlatform->InitWebGLConfig();
+  gPlatform->InitWebGPUConfig();
+  gPlatform->InitWindowOcclusionConfig();
+  gPlatform->InitBackdropFilterConfig();
+  gPlatform->InitAcceleratedCanvas2DConfig();
+
+#if defined(XP_WIN)
+  // When using WebRender, we defer initialization of the D3D11 devices until
+  // the (rare) cases where they're used. Note that the GPU process where
+  // WebRender runs doesn't initialize gfxPlatform and performs explicit
+  // initialization of the bits it needs.
+  if (XRE_IsParentProcess() && !gfxConfig::IsEnabled(Feature::GPU_PROCESS) &&
+      StaticPrefs::
+          gfx_webrender_enabled_no_gpu_process_with_angle_win_AtStartup()) {
+    gPlatform->EnsureDevicesInitialized();
+  }
+#endif
+
+  if (gfxConfig::IsEnabled(Feature::GPU_PROCESS)) {
+    GPUProcessManager* gpu = GPUProcessManager::Get();
+    Unused << gpu->LaunchGPUProcess();
+  }
+
+  if (XRE_IsParentProcess()) {
+    // Create the global vsync source and dispatcher.
+    RefPtr<VsyncSource> vsyncSource =
+        gfxPlatform::ForceSoftwareVsync()
+            ? gPlatform->GetSoftwareVsyncSource()
+            : gPlatform->GetGlobalHardwareVsyncSource();
+    gPlatform->mVsyncDispatcher = new VsyncDispatcher(vsyncSource);
+
+    // Listen for layout.frame_rate pref changes.
+    Preferences::RegisterCallback(
+        gfxPlatform::ReInitFrameRate,
+        nsDependentCString(StaticPrefs::GetPrefName_layout_frame_rate()));
+    Preferences::RegisterCallback(
+        gfxPlatform::ReInitFrameRate,
+        nsDependentCString(
+            StaticPrefs::GetPrefName_privacy_resistFingerprinting()));
+  }
+
+  // Create the sRGB to output display profile transforms. They can be accessed
+  // off the main thread so we want to avoid a race condition.
+  InitializeCMS();
+
+  SkGraphics::Init();
+#ifdef MOZ_ENABLE_FREETYPE
+  SkInitCairoFT(gPlatform->FontHintingEnabled());
+#endif
+  gfxGradientCache::Init();
+
+  InitLayersIPC();
+
+  // This *create* the platform font list instance, but may not *initialize* it
+  // yet if the gfx.font-list.lazy-init.enabled pref is set. The first *use*
+  // of the list will ensure it is initialized.
+  if (!gPlatform->CreatePlatformFontList()) {
+    MOZ_CRASH("Could not initialize gfxPlatformFontList");
+  }
+
+  gPlatform->mScreenReferenceDrawTarget =
+      gPlatform->CreateOffscreenContentDrawTarget(IntSize(1, 1),
+                                                  SurfaceFormat::B8G8R8A8);
+  if (!gPlatform->mScreenReferenceDrawTarget ||
+      !gPlatform->mScreenReferenceDrawTarget->IsValid()) {
+    // If TDR is detected, create a draw target with software backend
+    // and it should be replaced later when the process gets the device
+    // reset notification.
+    if (!gPlatform->DidRenderingDeviceReset()) {
+      gfxCriticalError() << "Could not initialize mScreenReferenceDrawTarget";
+    }
+  }
+
+  if (NS_FAILED(gfxFontCache::Init())) {
+    MOZ_CRASH("Could not initialize gfxFontCache");
+  }
+
+  Preferences::RegisterPrefixCallbacks(FontPrefChanged, kObservedPrefs);
+
+  GLContext::PlatformStartup();
+
+  // Listen to memory pressure event so we can purge DrawTarget caches
+  gPlatform->mMemoryPressureObserver =
+      layers::MemoryPressureObserver::Create(gPlatform);
+
+  // Request the imgITools service, implicitly initializing ImageLib.
+  nsCOMPtr<imgITools> imgTools = do_GetService("@mozilla.org/image/tools;1");
+  if (!imgTools) {
+    MOZ_CRASH("Could not initialize ImageLib");
+  }
+
+  RegisterStrongMemoryReporter(new GfxMemoryImageReporter());
+  if (XRE_IsParentProcess()) {
+    RegisterStrongAsyncMemoryReporter(new WebRenderMemoryReporter());
+  }
+
+  RegisterStrongMemoryReporter(new SkMemoryReporter());
+
+  uint32_t skiaCacheSize = GetSkiaGlyphCacheSize();
+  if (skiaCacheSize != kDefaultGlyphCacheSize) {
+    SkGraphics::SetFontCacheLimit(skiaCacheSize);
+  }
+
+  InitNullMetadata();
+  InitOpenGLConfig();
+
+  if (XRE_IsParentProcess()) {
+    Preferences::Unlock(FONT_VARIATIONS_PREF);
+    if (!gfxPlatform::HasVariationFontSupport()) {
+      // Ensure variation fonts are disabled and the pref is locked.
+      Preferences::SetBool(FONT_VARIATIONS_PREF, false, PrefValueKind::Default);
+      Preferences::SetBool(FONT_VARIATIONS_PREF, false);
+      Preferences::Lock(FONT_VARIATIONS_PREF);
+    }
+  }
+
+  if (XRE_IsParentProcess()) {
+    ReportTelemetry();
+  }
+
+  nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
+  if (obs) {
+    obs->NotifyObservers(nullptr, "gfx-features-ready", nullptr);
+  }
+}
+
+void gfxPlatform::ReportTelemetry() {
+  MOZ_RELEASE_ASSERT(XRE_IsParentProcess(),
+                     "GFX: Only allowed to be called from parent process.");
+
+  nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
+
+  {
+    auto& screenManager = widget::ScreenManager::GetSingleton();
+    const uint32_t screenCount = screenManager.CurrentScreenList().Length();
+    RefPtr<widget::Screen> primaryScreen = screenManager.GetPrimaryScreen();
+    const LayoutDeviceIntRect rect = primaryScreen->GetRect();
+
+    Telemetry::ScalarSet(Telemetry::ScalarID::GFX_DISPLAY_COUNT, screenCount);
+    Telemetry::ScalarSet(Telemetry::ScalarID::GFX_DISPLAY_PRIMARY_HEIGHT,
+                         uint32_t(rect.Height()));
+    Telemetry::ScalarSet(Telemetry::ScalarID::GFX_DISPLAY_PRIMARY_WIDTH,
+                         uint32_t(rect.Width()));
+  }
+
+  nsString adapterDesc;
+  gfxInfo->GetAdapterDescription(adapterDesc);
+  Telemetry::ScalarSet(Telemetry::ScalarID::GFX_ADAPTER_DESCRIPTION,
+                       adapterDesc);
+
+  nsString adapterVendorId;
+  gfxInfo->GetAdapterVendorID(adapterVendorId);
+  Telemetry::ScalarSet(Telemetry::ScalarID::GFX_ADAPTER_VENDOR_ID,
+                       adapterVendorId);
+
+  nsString adapterDeviceId;
+  gfxInfo->GetAdapterDeviceID(adapterDeviceId);
+  Telemetry::ScalarSet(Telemetry::ScalarID::GFX_ADAPTER_DEVICE_ID,
+                       adapterDeviceId);
+
+  nsString adapterSubsystemId;
+  gfxInfo->GetAdapterSubsysID(adapterSubsystemId);
+  Telemetry::ScalarSet(Telemetry::ScalarID::GFX_ADAPTER_SUBSYSTEM_ID,
+                       adapterSubsystemId);
+
+  uint32_t adapterRam = 0;
+  gfxInfo->GetAdapterRAM(&adapterRam);
+  Telemetry::ScalarSet(Telemetry::ScalarID::GFX_ADAPTER_RAM, adapterRam);
+
+  nsString adapterDriver;
+  gfxInfo->GetAdapterDriver(adapterDriver);
+  Telemetry::ScalarSet(Telemetry::ScalarID::GFX_ADAPTER_DRIVER_FILES,
+                       adapterDriver);
+
+  nsString adapterDriverVendor;
+  gfxInfo->GetAdapterDriverVendor(adapterDriverVendor);
+  Telemetry::ScalarSet(Telemetry::ScalarID::GFX_ADAPTER_DRIVER_VENDOR,
+                       adapterDriverVendor);
+
+  nsString adapterDriverVersion;
+  gfxInfo->GetAdapterDriverVersion(adapterDriverVersion);
+  Telemetry::ScalarSet(Telemetry::ScalarID::GFX_ADAPTER_DRIVER_VERSION,
+                       adapterDriverVersion);
+
+  nsString adapterDriverDate;
+  gfxInfo->GetAdapterDriverDate(adapterDriverDate);
+  Telemetry::ScalarSet(Telemetry::ScalarID::GFX_ADAPTER_DRIVER_DATE,
+                       adapterDriverDate);
+
+  Telemetry::ScalarSet(Telemetry::ScalarID::GFX_HEADLESS, IsHeadless());
+
+  MOZ_ASSERT(gPlatform, "Need gPlatform to generate some telemetry.");
+  Telemetry::ScalarSet(Telemetry::ScalarID::GFX_SUPPORTS_HDR,
+                       gPlatform->SupportsHDR());
+}
+
+static bool IsFeatureSupported(long aFeature, bool aDefault) {
+  nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
+  nsCString blockId;
+  int32_t status;
+  if (!NS_SUCCEEDED(gfxInfo->GetFeatureStatus(aFeature, blockId, &status))) {
+    return aDefault;
+  }
+  return status == nsIGfxInfo::FEATURE_STATUS_OK;
+}
+
+/* static*/
+bool gfxPlatform::IsDXInterop2Blocked() {
+  return !IsFeatureSupported(nsIGfxInfo::FEATURE_DX_INTEROP2, false);
+}
+
+/* static*/
+bool gfxPlatform::IsDXNV12Blocked() {
+  return !IsFeatureSupported(nsIGfxInfo::FEATURE_DX_NV12, false);
+}
+
+/* static*/
+bool gfxPlatform::IsDXP010Blocked() {
+  return !IsFeatureSupported(nsIGfxInfo::FEATURE_DX_P010, false);
+}
+
+/* static*/
+bool gfxPlatform::IsDXP016Blocked() {
+  return !IsFeatureSupported(nsIGfxInfo::FEATURE_DX_P016, false);
+}
+
+/* static */
+int32_t gfxPlatform::MaxTextureSize() {
+  // Make sure we don't completely break rendering because of a typo in the
+  // pref or whatnot.
+  const int32_t kMinSizePref = 2048;
+  return std::max(
+      kMinSizePref,
+      StaticPrefs::gfx_max_texture_size_AtStartup_DoNotUseDirectly());
+}
+
+/* static */
+int32_t gfxPlatform::MaxAllocSize() {
+  // Make sure we don't completely break rendering because of a typo in the
+  // pref or whatnot.
+  const int32_t kMinAllocPref = 10000000;
+  return std::max(kMinAllocPref,
+                  StaticPrefs::gfx_max_alloc_size_AtStartup_DoNotUseDirectly());
+}
+
+/* static */
+void gfxPlatform::InitMoz2DLogging() {
+  auto fwd = new CrashStatsLogForwarder(
+      CrashReporter::Annotation::GraphicsCriticalError);
+  fwd->SetCircularBufferSize(StaticPrefs::gfx_logging_crash_length_AtStartup());
+
+  mozilla::gfx::Config cfg;
+  cfg.mLogForwarder = fwd;
+  cfg.mMaxTextureSize = gfxPlatform::MaxTextureSize();
+  cfg.mMaxAllocSize = gfxPlatform::MaxAllocSize();
+
+  gfx::Factory::Init(cfg);
+}
+
+/* static */
+bool gfxPlatform::IsHeadless() {
+  static bool initialized = false;
+  static bool headless = false;
+  if (!initialized) {
+    initialized = true;
+    headless = PR_GetEnv("MOZ_HEADLESS");
+  }
+  return headless;
+}
+
+/* static */
+bool gfxPlatform::UseRemoteCanvas() {
+  return XRE_IsContentProcess() && gfx::gfxVars::RemoteCanvasEnabled();
+}
+
+/* static */
+bool gfxPlatform::IsBackendAccelerated(
+    const mozilla::gfx::BackendType aBackendType) {
+  return aBackendType == BackendType::DIRECT2D ||
+         aBackendType == BackendType::DIRECT2D1_1;
+}
+
+/* static */
+bool gfxPlatform::CanMigrateMacGPUs() {
+  int32_t pMigration = StaticPrefs::gfx_compositor_gpu_migration();
+
+  bool forceDisable = pMigration == 0;
+  bool forceEnable = pMigration == 2;
+
+  return forceEnable || !forceDisable;
+}
+
+static bool sLayersIPCIsUp = false;
+
+/* static */
+void gfxPlatform::InitNullMetadata() {
+  ScrollMetadata::sNullMetadata = new ScrollMetadata();
+  ClearOnShutdown(&ScrollMetadata::sNullMetadata);
+}
+
+void gfxPlatform::Shutdown() {
+  // In some cases, gPlatform may not be created but Shutdown() called,
+  // e.g., during xpcshell tests.
+  if (!gPlatform) {
+    return;
+  }
+
+  MOZ_ASSERT(!sLayersIPCIsUp);
+
+  // These may be called before the corresponding subsystems have actually
+  // started up. That's OK, they can handle it.
+  gfxFontCache::Shutdown();
+  gfxGradientCache::Shutdown();
+  gfxAlphaBoxBlur::ShutdownBlurCache();
+  gfxGraphiteShaper::Shutdown();
+  gfxPlatformFontList::Shutdown();
+  gfxFontMissingGlyphs::Shutdown();
+
+  // Free the various non-null transforms and loaded profiles
+  ShutdownCMS();
+
+  Preferences::UnregisterPrefixCallbacks(FontPrefChanged, kObservedPrefs);
+
+  NS_ASSERTION(gPlatform->mMemoryPressureObserver,
+               "mMemoryPressureObserver has already gone");
+  if (gPlatform->mMemoryPressureObserver) {
+    gPlatform->mMemoryPressureObserver->Unregister();
+    gPlatform->mMemoryPressureObserver = nullptr;
+  }
+
+  if (XRE_IsParentProcess()) {
+    if (gPlatform->mGlobalHardwareVsyncSource) {
+      gPlatform->mGlobalHardwareVsyncSource->Shutdown();
+    }
+    if (gPlatform->mSoftwareVsyncSource &&
+        gPlatform->mSoftwareVsyncSource !=
+            gPlatform->mGlobalHardwareVsyncSource) {
+      gPlatform->mSoftwareVsyncSource->Shutdown();
+    }
+  }
+
+  gPlatform->mGlobalHardwareVsyncSource = nullptr;
+  gPlatform->mSoftwareVsyncSource = nullptr;
+  gPlatform->mVsyncDispatcher = nullptr;
+
+  // Shut down the default GL context provider.
+  GLContextProvider::Shutdown();
+
+#if defined(XP_WIN)
+  // The above shutdown calls operate on the available context providers on
+  // most platforms.  Windows is a "special snowflake", though, and has three
+  // context providers available, so we have to shut all of them down.
+  // We should only support the default GL provider on Windows; then, this
+  // could go away. Unfortunately, we currently support WGL (the default) for
+  // WebGL on Optimus.
+  GLContextProviderEGL::Shutdown();
+#endif
+
+  if (XRE_IsParentProcess()) {
+    GPUProcessManager::Shutdown();
+    VRProcessManager::Shutdown();
+    RDDProcessManager::Shutdown();
+  }
+
+  gfx::Factory::ShutDown();
+  gfxVars::Shutdown();
+  gfxFont::DestroySingletons();
+
+  gfxConfig::Shutdown();
+
+  gPlatform->WillShutdown();
+
+  delete gPlatform;
+  gPlatform = nullptr;
+}
+
+/* static */
+void gfxPlatform::InitLayersIPC() {
+  if (sLayersIPCIsUp) {
+    return;
+  }
+  sLayersIPCIsUp = true;
+
+  if (XRE_IsParentProcess()) {
+#if defined(XP_WIN)
+    if (gfxConfig::IsEnabled(gfx::Feature::WINDOW_OCCLUSION)) {
+      widget::WinWindowOcclusionTracker::Ensure();
+    }
+#endif
+    if (!gfxConfig::IsEnabled(Feature::GPU_PROCESS)) {
+      RemoteTextureMap::Init();
+      if (gfxVars::UseCanvasRenderThread()) {
+        gfx::CanvasRenderThread::Start();
+      }
+      wr::RenderThread::Start(GPUProcessManager::Get()->AllocateNamespace());
+      image::ImageMemoryReporter::InitForWebRender();
+    }
+
+    layers::CompositorThreadHolder::Start();
+  }
+}
+
+/* static */
+void gfxPlatform::ShutdownLayersIPC() {
+  if (!sLayersIPCIsUp) {
+    return;
+  }
+  sLayersIPCIsUp = false;
+
+  if (XRE_IsContentProcess()) {
+    gfx::VRManagerChild::ShutDown();
+    gfx::CanvasManagerChild::Shutdown();
+    // cf bug 1215265.
+    if (StaticPrefs::layers_child_process_shutdown()) {
+      layers::CompositorManagerChild::Shutdown();
+      layers::ImageBridgeChild::ShutDown();
+    }
+
+  } else if (XRE_IsParentProcess()) {
+    VideoBridgeParent::Shutdown();
+    RDDProcessManager::RDDProcessShutdown();
+    gfx::VRManagerChild::ShutDown();
+    gfx::CanvasManagerChild::Shutdown();
+    layers::CompositorManagerChild::Shutdown();
+    layers::ImageBridgeChild::ShutDown();
+    // This could be running on either the Compositor or the Renderer thread.
+    gfx::CanvasManagerParent::Shutdown();
+    // This has to happen after shutting down the child protocols.
+    layers::CompositorThreadHolder::Shutdown();
+    RemoteTextureMap::Shutdown();
+    image::ImageMemoryReporter::ShutdownForWebRender();
+    // There is a case that RenderThread exists when UseWebRender() is
+    // false. This could happen when WebRender was fallbacked to compositor.
+    if (wr::RenderThread::Get()) {
+      wr::RenderThread::ShutDown();
+
+      Preferences::UnregisterCallback(WebRenderDebugPrefChangeCallback,
+                                      WR_DEBUG_PREF);
+      Preferences::UnregisterCallback(WebRendeProfilerUIPrefChangeCallback,
+                                      "gfx.webrender.debug.profiler-ui");
+      Preferences::UnregisterCallback(
+          WebRenderBlobTileSizePrefChangeCallback,
+          nsDependentCString(
+              StaticPrefs::GetPrefName_gfx_webrender_blob_tile_size()));
+    }
+    if (gfx::CanvasRenderThread::Get()) {
+      gfx::CanvasRenderThread::ShutDown();
+    }
+#if defined(XP_WIN)
+    widget::WinWindowOcclusionTracker::ShutDown();
+#endif
+  } else {
+    // TODO: There are other kind of processes and we should make sure gfx
+    // stuff is either not created there or shut down properly.
+  }
+}
+
+void gfxPlatform::WillShutdown() {
+  // Destoy these first in case they depend on backend-specific resources.
+  // Otherwise, the backend's destructor would be called before the
+  // base gfxPlatform destructor.
+  mScreenReferenceSurface = nullptr;
+  mScreenReferenceDrawTarget = nullptr;
+
+  // Always clear out the Skia font cache here, in case it is referencing any
+  // SharedFTFaces that would otherwise outlive destruction of the FT_Library
+  // that owns them.
+  SkGraphics::PurgeFontCache();
+
+  // The cairo folks think we should only clean up in debug builds,
+  // but we're generally in the habit of trying to shut down as
+  // cleanly as possible even in production code, so call this
+  // cairo_debug_* function unconditionally.
+  //
+  // because cairo can assert and thus crash on shutdown, don't do this in
+  // release builds
+#ifdef NS_FREE_PERMANENT_DATA
+  cairo_debug_reset_static_data();
+#endif
+}
+
+gfxPlatform::~gfxPlatform() = default;
+
+/* static */
+already_AddRefed<DrawTarget> gfxPlatform::CreateDrawTargetForSurface(
+    gfxASurface* aSurface, const IntSize& aSize) {
+  SurfaceFormat format = aSurface->GetSurfaceFormat();
+  RefPtr<DrawTarget> drawTarget = Factory::CreateDrawTargetForCairoSurface(
+      aSurface->CairoSurface(), aSize, &format);
+  if (!drawTarget) {
+    gfxWarning() << "gfxPlatform::CreateDrawTargetForSurface failed in "
+                    "CreateDrawTargetForCairoSurface";
+    return nullptr;
+  }
+  return drawTarget.forget();
+}
+
+cairo_user_data_key_t kSourceSurface;
+
+/**
+ * Record the backend that was used to construct the SourceSurface.
+ * When getting the cached SourceSurface for a gfxASurface/DrawTarget pair,
+ * we check to make sure the DrawTarget's backend matches the backend
+ * for the cached SourceSurface, and only use it if they match. This
+ * can avoid expensive and unnecessary readbacks.
+ */
+struct SourceSurfaceUserData {
+  RefPtr<SourceSurface> mSrcSurface;
+  BackendType mBackendType;
+};
+
+static void SourceBufferDestroy(void* srcSurfUD) {
+  delete static_cast<SourceSurfaceUserData*>(srcSurfUD);
+}
+
+UserDataKey kThebesSurface;
+
+struct DependentSourceSurfaceUserData {
+  RefPtr<gfxASurface> mSurface;
+};
+
+static void SourceSurfaceDestroyed(void* aData) {
+  delete static_cast<DependentSourceSurfaceUserData*>(aData);
+}
+
+void gfxPlatform::ClearSourceSurfaceForSurface(gfxASurface* aSurface) {
+  aSurface->SetData(&kSourceSurface, nullptr, nullptr);
+}
+
+/* static */
+already_AddRefed<SourceSurface> gfxPlatform::GetSourceSurfaceForSurface(
+    RefPtr<DrawTarget> aTarget, gfxASurface* aSurface, bool aIsPlugin) {
+  if (!aSurface->CairoSurface() || aSurface->CairoStatus()) {
+    return nullptr;
+  }
+
+  if (!aTarget) {
+    aTarget = gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
+  }
+
+  void* userData = aSurface->GetData(&kSourceSurface);
+
+  if (userData) {
+    SourceSurfaceUserData* surf = static_cast<SourceSurfaceUserData*>(userData);
+
+    if (surf->mSrcSurface->IsValid() &&
+        surf->mBackendType == aTarget->GetBackendType()) {
+      RefPtr<SourceSurface> srcSurface(surf->mSrcSurface);
+      return srcSurface.forget();
+    }
+    // We can just continue here as when setting new user data the destroy
+    // function will be called for the old user data.
+  }
+
+  SurfaceFormat format = aSurface->GetSurfaceFormat();
+
+  if (aTarget->GetBackendType() == BackendType::CAIRO) {
+    // If we're going to be used with a CAIRO DrawTarget, then just create a
+    // SourceSurfaceCairo since we don't know the underlying type of the CAIRO
+    // DrawTarget and can't pick a better surface type. Doing this also avoids
+    // readback of aSurface's surface into memory if, for example, aSurface
+    // wraps an xlib cairo surface (which can be important to avoid a major
+    // slowdown).
+    //
+    // We return here regardless of whether CreateSourceSurfaceFromNativeSurface
+    // succeeds or not since we don't expect to be able to do any better below
+    // if it fails.
+    //
+    // Note that the returned SourceSurfaceCairo holds a strong reference to
+    // the cairo_surface_t* that it wraps, which essencially means it holds a
+    // strong reference to aSurface since aSurface shares its
+    // cairo_surface_t*'s reference count variable. As a result we can't cache
+    // srcBuffer on aSurface (see below) since aSurface would then hold a
+    // strong reference back to srcBuffer, creating a reference loop and a
+    // memory leak. Not caching is fine since wrapping is cheap enough (no
+    // copying) so we can just wrap again next time we're called.
+    return Factory::CreateSourceSurfaceForCairoSurface(
+        aSurface->CairoSurface(), aSurface->GetSize(), format);
+  }
+
+  RefPtr<SourceSurface> srcBuffer;
+
+  // Currently no other DrawTarget types implement
+  // CreateSourceSurfaceFromNativeSurface
+
+  if (!srcBuffer) {
+    // If aSurface wraps data, we can create a SourceSurfaceRawData that wraps
+    // the same data, then optimize it for aTarget:
+    RefPtr<DataSourceSurface> surf = GetWrappedDataSourceSurface(aSurface);
+    if (surf) {
+      srcBuffer = aIsPlugin
+                      ? aTarget->OptimizeSourceSurfaceForUnknownAlpha(surf)
+                      : aTarget->OptimizeSourceSurface(surf);
+
+      if (srcBuffer == surf) {
+        // GetWrappedDataSourceSurface returns a SourceSurface that holds a
+        // strong reference to aSurface since it wraps aSurface's data and
+        // needs it to stay alive. As a result we can't cache srcBuffer on
+        // aSurface (below) since aSurface would then hold a strong reference
+        // back to srcBuffer, creating a reference loop and a memory leak. Not
+        // caching is fine since wrapping is cheap enough (no copying) so we
+        // can just wrap again next time we're called.
+        //
+        // Note that the check below doesn't catch this since srcBuffer will be
+        // a SourceSurfaceRawData object (even if aSurface is not a
+        // gfxImageSurface object), which is why we need this separate check.
+        return srcBuffer.forget();
+      }
+    }
+  }
+
+  if (!srcBuffer) {
+    MOZ_ASSERT(aTarget->GetBackendType() != BackendType::CAIRO,
+               "We already tried CreateSourceSurfaceFromNativeSurface with a "
+               "DrawTargetCairo above");
+    // We've run out of performant options. We now try creating a SourceSurface
+    // using a temporary DrawTargetCairo and then optimizing it to aTarget's
+    // actual type. The CreateSourceSurfaceFromNativeSurface() call will
+    // likely create a DataSourceSurface (possibly involving copying and/or
+    // readback), and the OptimizeSourceSurface may well copy again and upload
+    // to the GPU. So, while this code path is rarely hit, hitting it may be
+    // very slow.
+    srcBuffer = Factory::CreateSourceSurfaceForCairoSurface(
+        aSurface->CairoSurface(), aSurface->GetSize(), format);
+    if (srcBuffer) {
+      srcBuffer = aTarget->OptimizeSourceSurface(srcBuffer);
+    }
+  }
+
+  if (!srcBuffer) {
+    return nullptr;
+  }
+
+  if ((srcBuffer->GetType() == SurfaceType::CAIRO &&
+       static_cast<SourceSurfaceCairo*>(srcBuffer.get())->GetSurface() ==
+           aSurface->CairoSurface()) ||
+      (srcBuffer->GetType() == SurfaceType::CAIRO_IMAGE &&
+       static_cast<DataSourceSurfaceCairo*>(srcBuffer.get())->GetSurface() ==
+           aSurface->CairoSurface())) {
+    // See the "Note that the returned SourceSurfaceCairo..." comment above.
+    return srcBuffer.forget();
+  }
+
+  // Add user data to aSurface so we can cache lookups in the future.
+  auto* srcSurfUD = new SourceSurfaceUserData;
+  srcSurfUD->mBackendType = aTarget->GetBackendType();
+  srcSurfUD->mSrcSurface = srcBuffer;
+  aSurface->SetData(&kSourceSurface, srcSurfUD, SourceBufferDestroy);
+
+  return srcBuffer.forget();
+}
+
+already_AddRefed<DataSourceSurface> gfxPlatform::GetWrappedDataSourceSurface(
+    gfxASurface* aSurface) {
+  RefPtr<gfxImageSurface> image = aSurface->GetAsImageSurface();
+  if (!image) {
+    return nullptr;
+  }
+  RefPtr<DataSourceSurface> result = Factory::CreateWrappingDataSourceSurface(
+      image->Data(), image->Stride(), image->GetSize(),
+      ImageFormatToSurfaceFormat(image->Format()));
+
+  if (!result) {
+    return nullptr;
+  }
+
+  // If we wrapped the underlying data of aSurface, then we need to add user
+  // data to make sure aSurface stays alive until we are done with the data.
+  auto* srcSurfUD = new DependentSourceSurfaceUserData;
+  srcSurfUD->mSurface = aSurface;
+  result->AddUserData(&kThebesSurface, srcSurfUD, SourceSurfaceDestroyed);
+
+  return result.forget();
+}
+
+void gfxPlatform::PopulateScreenInfo() {
+  nsCOMPtr<nsIScreenManager> manager =
+      do_GetService("@mozilla.org/gfx/screenmanager;1");
+  MOZ_ASSERT(manager, "failed to get nsIScreenManager");
+
+  nsCOMPtr<nsIScreen> screen;
+  manager->GetPrimaryScreen(getter_AddRefs(screen));
+  if (!screen) {
+    // This can happen in xpcshell, for instance
+    return;
+  }
+
+  screen->GetColorDepth(&mScreenDepth);
+  if (XRE_IsParentProcess()) {
+    gfxVars::SetScreenDepth(mScreenDepth);
+  }
+
+  int left, top;
+  screen->GetRect(&left, &top, &mScreenSize.width, &mScreenSize.height);
+}
+
+bool gfxPlatform::SupportsAzureContentForDrawTarget(DrawTarget* aTarget) {
+  if (!aTarget || !aTarget->IsValid()) {
+    return false;
+  }
+
+  return SupportsAzureContentForType(aTarget->GetBackendType());
+}
+
+void gfxPlatform::PurgeSkiaFontCache() {
+  if (gfxPlatform::GetPlatform()->GetDefaultContentBackend() ==
+      BackendType::SKIA) {
+    SkGraphics::PurgeFontCache();
+  }
+}
+
+already_AddRefed<DrawTarget> gfxPlatform::CreateDrawTargetForBackend(
+    BackendType aBackend, const IntSize& aSize, SurfaceFormat aFormat) {
+  // There is a bunch of knowledge in the gfxPlatform heirarchy about how to
+  // create the best offscreen surface for the current system and situation. We
+  // can easily take advantage of this for the Cairo backend, so that's what we
+  // do.
+  // mozilla::gfx::Factory can get away without having all this knowledge for
+  // now, but this might need to change in the future (using
+  // CreateOffscreenSurface() and CreateDrawTargetForSurface() for all
+  // backends).
+  if (aBackend == BackendType::CAIRO) {
+    RefPtr<gfxASurface> surf =
+        CreateOffscreenSurface(aSize, SurfaceFormatToImageFormat(aFormat));
+    if (!surf || surf->CairoStatus()) {
+      return nullptr;
+    }
+    return CreateDrawTargetForSurface(surf, aSize);
+  }
+  return Factory::CreateDrawTarget(aBackend, aSize, aFormat);
+}
+
+already_AddRefed<DrawTarget> gfxPlatform::CreateOffscreenCanvasDrawTarget(
+    const IntSize& aSize, SurfaceFormat aFormat) {
+  NS_ASSERTION(mPreferredCanvasBackend != BackendType::NONE, "No backend.");
+
+  // If we are using remote canvas we don't want to use acceleration in
+  // canvas DrawTargets we are not remoting, so we always use the fallback
+  // software one.
+  if (!gfxPlatform::UseRemoteCanvas() ||
+      !gfxPlatform::IsBackendAccelerated(mPreferredCanvasBackend)) {
+    RefPtr<DrawTarget> target =
+        CreateDrawTargetForBackend(mPreferredCanvasBackend, aSize, aFormat);
+    if (target || mFallbackCanvasBackend == BackendType::NONE) {
+      return target.forget();
+    }
+  }
+
+#ifdef XP_WIN
+  // On Windows, the fallback backend (Cairo) should use its image backend.
+  return Factory::CreateDrawTarget(mFallbackCanvasBackend, aSize, aFormat);
+#else
+  return CreateDrawTargetForBackend(mFallbackCanvasBackend, aSize, aFormat);
+#endif
+}
+
+already_AddRefed<DrawTarget> gfxPlatform::CreateOffscreenContentDrawTarget(
+    const IntSize& aSize, SurfaceFormat aFormat, bool aFallback) {
+  BackendType backend = (aFallback) ? mSoftwareBackend : mContentBackend;
+  NS_ASSERTION(backend != BackendType::NONE, "No backend.");
+  RefPtr<DrawTarget> dt = CreateDrawTargetForBackend(backend, aSize, aFormat);
+
+  if (!dt) {
+    return nullptr;
+  }
+
+  // We'd prefer this to take proper care and return a CaptureDT, but for the
+  // moment since we can't and this means we're going to be drawing on the main
+  // thread force it's initialization. See bug 1526045 and bug 1521368.
+  dt->ClearRect(gfx::Rect());
+  if (!dt->IsValid()) {
+    return nullptr;
+  }
+  return dt.forget();
+}
+
+already_AddRefed<DrawTarget> gfxPlatform::CreateSimilarSoftwareDrawTarget(
+    DrawTarget* aDT, const IntSize& aSize, SurfaceFormat aFormat) {
+  RefPtr<DrawTarget> dt;
+
+  if (Factory::DoesBackendSupportDataDrawtarget(aDT->GetBackendType())) {
+    dt = aDT->CreateSimilarDrawTarget(aSize, aFormat);
+  } else {
+    BackendType backendType = BackendType::SKIA;
+    dt = Factory::CreateDrawTarget(backendType, aSize, aFormat);
+  }
+
+  return dt.forget();
+}
+
+/* static */
+already_AddRefed<DrawTarget> gfxPlatform::CreateDrawTargetForData(
+    unsigned char* aData, const IntSize& aSize, int32_t aStride,
+    SurfaceFormat aFormat, bool aUninitialized) {
+  BackendType backendType = gfxVars::ContentBackend();
+  NS_ASSERTION(backendType != BackendType::NONE, "No backend.");
+
+  if (!Factory::DoesBackendSupportDataDrawtarget(backendType)) {
+    backendType = BackendType::SKIA;
+  }
+
+  RefPtr<DrawTarget> dt = Factory::CreateDrawTargetForData(
+      backendType, aData, aSize, aStride, aFormat, aUninitialized);
+
+  return dt.forget();
+}
+
+/* static */
+BackendType gfxPlatform::BackendTypeForName(const nsCString& aName) {
+  if (aName.EqualsLiteral("cairo")) return BackendType::CAIRO;
+  if (aName.EqualsLiteral("skia")) return BackendType::SKIA;
+  if (aName.EqualsLiteral("direct2d")) return BackendType::DIRECT2D;
+  if (aName.EqualsLiteral("direct2d1.1")) return BackendType::DIRECT2D1_1;
+  return BackendType::NONE;
+}
+
+nsresult gfxPlatform::GetFontList(nsAtom* aLangGroup,
+                                  const nsACString& aGenericFamily,
+                                  nsTArray<nsString>& aListOfFonts) {
+  gfxPlatformFontList::PlatformFontList()->GetFontList(
+      aLangGroup, aGenericFamily, aListOfFonts);
+  return NS_OK;
+}
+
+nsresult gfxPlatform::UpdateFontList(bool aFullRebuild) {
+  gfxPlatformFontList::PlatformFontList()->UpdateFontList(aFullRebuild);
+  return NS_OK;
+}
+
+void gfxPlatform::GetStandardFamilyName(const nsCString& aFontName,
+                                        nsACString& aFamilyName) {
+  gfxPlatformFontList::PlatformFontList()->GetStandardFamilyName(aFontName,
+                                                                 aFamilyName);
+}
+
+nsAutoCString gfxPlatform::GetDefaultFontName(
+    const nsACString& aLangGroup, const nsACString& aGenericFamily) {
+  // To benefit from Return Value Optimization, all paths here must return
+  // this one variable:
+  nsAutoCString result;
+
+  auto* pfl = gfxPlatformFontList::PlatformFontList();
+  FamilyAndGeneric fam = pfl->GetDefaultFontFamily(aLangGroup, aGenericFamily);
+  if (!pfl->GetLocalizedFamilyName(fam.mFamily, result)) {
+    NS_WARNING("missing default font-family name");
+  }
+
+  return result;
+}
+
+bool gfxPlatform::DownloadableFontsEnabled() {
+  if (mAllowDownloadableFonts == UNINITIALIZED_VALUE) {
+    mAllowDownloadableFonts =
+        Preferences::GetBool(GFX_DOWNLOADABLE_FONTS_ENABLED, false);
+  }
+
+  return mAllowDownloadableFonts;
+}
+
+bool gfxPlatform::UseCmapsDuringSystemFallback() {
+  return StaticPrefs::gfx_font_rendering_fallback_always_use_cmaps();
+}
+
+bool gfxPlatform::OpenTypeSVGEnabled() {
+  return StaticPrefs::gfx_font_rendering_opentype_svg_enabled();
+}
+
+uint32_t gfxPlatform::WordCacheCharLimit() {
+  return StaticPrefs::gfx_font_rendering_wordcache_charlimit();
+}
+
+uint32_t gfxPlatform::WordCacheMaxEntries() {
+  return StaticPrefs::gfx_font_rendering_wordcache_maxentries();
+}
+
+bool gfxPlatform::UseGraphiteShaping() {
+  return StaticPrefs::gfx_font_rendering_graphite_enabled();
+}
+
+bool gfxPlatform::IsFontFormatSupported(
+    StyleFontFaceSourceFormatKeyword aFormatHint,
+    StyleFontFaceSourceTechFlags aTechFlags) {
+  // By default, font resources are assumed to be supported; but if the format
+  // hint or technology flags explicitly indicate something we don't support,
+  // then return false.
+  switch (aFormatHint) {
+    case StyleFontFaceSourceFormatKeyword::None:
+      break;
+    case StyleFontFaceSourceFormatKeyword::Collection:
+      return false;
+    case StyleFontFaceSourceFormatKeyword::Opentype:
+    case StyleFontFaceSourceFormatKeyword::Truetype:
+      break;
+    case StyleFontFaceSourceFormatKeyword::EmbeddedOpentype:
+      return false;
+    case StyleFontFaceSourceFormatKeyword::Svg:
+      return false;
+    case StyleFontFaceSourceFormatKeyword::Woff:
+      break;
+    case StyleFontFaceSourceFormatKeyword::Woff2:
+      break;
+    case StyleFontFaceSourceFormatKeyword::Unknown:
+      return false;
+    default:
+      MOZ_ASSERT_UNREACHABLE("bad format hint!");
+      return false;
+  }
+  StyleFontFaceSourceTechFlags unsupportedTechnologies =
+      StyleFontFaceSourceTechFlags::INCREMENTAL |
+      StyleFontFaceSourceTechFlags::COLOR_SBIX;
+  if (!StaticPrefs::gfx_downloadable_fonts_keep_color_bitmaps()) {
+    unsupportedTechnologies |= StyleFontFaceSourceTechFlags::COLOR_CBDT;
+  }
+  if (!StaticPrefs::gfx_font_rendering_colr_v1_enabled()) {
+    unsupportedTechnologies |= StyleFontFaceSourceTechFlags::COLOR_COLRV1;
+  }
+  if (!StaticPrefs::layout_css_font_palette_enabled()) {
+    unsupportedTechnologies |= StyleFontFaceSourceTechFlags::PALETTES;
+  }
+  if (!StaticPrefs::layout_css_font_variations_enabled()) {
+    unsupportedTechnologies |= StyleFontFaceSourceTechFlags::VARIATIONS;
+  }
+  if (aTechFlags & unsupportedTechnologies) {
+    return false;
+  }
+  return true;
+}
+
+bool gfxPlatform::IsKnownIconFontFamily(const nsAtom* aFamilyName) const {
+  return gfxPlatformFontList::PlatformFontList()->IsKnownIconFontFamily(
+      aFamilyName);
+}
+
+gfxFontEntry* gfxPlatform::LookupLocalFont(nsPresContext* aPresContext,
+                                           const nsACString& aFontName,
+                                           WeightRange aWeightForEntry,
+                                           StretchRange aStretchForEntry,
+                                           SlantStyleRange aStyleForEntry) {
+  return gfxPlatformFontList::PlatformFontList()->LookupLocalFont(
+      aPresContext, aFontName, aWeightForEntry, aStretchForEntry,
+      aStyleForEntry);
+}
+
+gfxFontEntry* gfxPlatform::MakePlatformFont(const nsACString& aFontName,
+                                            WeightRange aWeightForEntry,
+                                            StretchRange aStretchForEntry,
+                                            SlantStyleRange aStyleForEntry,
+                                            const uint8_t* aFontData,
+                                            uint32_t aLength) {
+  return gfxPlatformFontList::PlatformFontList()->MakePlatformFont(
+      aFontName, aWeightForEntry, aStretchForEntry, aStyleForEntry, aFontData,
+      aLength);
+}
+
+BackendPrefsData gfxPlatform::GetBackendPrefs() const {
+  BackendPrefsData data;
+
+  data.mCanvasBitmask = BackendTypeBit(BackendType::SKIA);
+  data.mContentBitmask = BackendTypeBit(BackendType::SKIA);
+
+#ifdef MOZ_WIDGET_GTK
+  data.mCanvasBitmask |= BackendTypeBit(BackendType::CAIRO);
+  data.mContentBitmask |= BackendTypeBit(BackendType::CAIRO);
+#endif
+
+  data.mCanvasDefault = BackendType::SKIA;
+  data.mContentDefault = BackendType::SKIA;
+
+  return data;
+}
+
+void gfxPlatform::InitBackendPrefs(BackendPrefsData&& aPrefsData) {
+  mPreferredCanvasBackend = GetCanvasBackendPref(aPrefsData.mCanvasBitmask);
+  if (mPreferredCanvasBackend == BackendType::NONE) {
+    mPreferredCanvasBackend = aPrefsData.mCanvasDefault;
+  }
+
+  if (mPreferredCanvasBackend == BackendType::DIRECT2D1_1) {
+    // Falling back to D2D 1.0 won't help us here. When D2D 1.1 DT creation
+    // fails it means the surface was too big or there's something wrong with
+    // the device. D2D 1.0 will encounter a similar situation.
+    mFallbackCanvasBackend = GetCanvasBackendPref(
+        aPrefsData.mCanvasBitmask & ~(BackendTypeBit(mPreferredCanvasBackend) |
+                                      BackendTypeBit(BackendType::DIRECT2D)));
+  } else {
+    mFallbackCanvasBackend = GetCanvasBackendPref(
+        aPrefsData.mCanvasBitmask & ~BackendTypeBit(mPreferredCanvasBackend));
+  }
+
+  mContentBackendBitmask = aPrefsData.mContentBitmask;
+  mContentBackend = GetContentBackendPref(mContentBackendBitmask);
+  if (mContentBackend == BackendType::NONE) {
+    mContentBackend = aPrefsData.mContentDefault;
+    // mContentBackendBitmask is our canonical reference for supported
+    // backends so we need to add the default if we are using it and
+    // overriding the prefs.
+    mContentBackendBitmask |= BackendTypeBit(aPrefsData.mContentDefault);
+  }
+
+  uint32_t swBackendBits = BackendTypeBit(BackendType::SKIA);
+#ifdef MOZ_WIDGET_GTK
+  swBackendBits |= BackendTypeBit(BackendType::CAIRO);
+#endif
+  mSoftwareBackend = GetContentBackendPref(swBackendBits);
+  if (mSoftwareBackend == BackendType::NONE) {
+    mSoftwareBackend = BackendType::SKIA;
+  }
+
+  // If we don't have a fallback canvas backend then use the same software
+  // fallback as content.
+  if (mFallbackCanvasBackend == BackendType::NONE) {
+    mFallbackCanvasBackend = mSoftwareBackend;
+  }
+
+  if (XRE_IsParentProcess()) {
+    gfxVars::SetContentBackend(mContentBackend);
+    gfxVars::SetSoftwareBackend(mSoftwareBackend);
+  }
+}
+
+/* static */
+BackendType gfxPlatform::GetCanvasBackendPref(uint32_t aBackendBitmask) {
+  return GetBackendPref("gfx.canvas.azure.backends", aBackendBitmask);
+}
+
+/* static */
+BackendType gfxPlatform::GetContentBackendPref(uint32_t& aBackendBitmask) {
+  return GetBackendPref("gfx.content.azure.backends", aBackendBitmask);
+}
+
+/* static */
+BackendType gfxPlatform::GetBackendPref(const char* aBackendPrefName,
+                                        uint32_t& aBackendBitmask) {
+  nsTArray<nsCString> backendList;
+  nsAutoCString prefString;
+  if (NS_SUCCEEDED(Preferences::GetCString(aBackendPrefName, prefString))) {
+    ParseString(prefString, ',', backendList);
+  }
+
+  uint32_t allowedBackends = 0;
+  BackendType result = BackendType::NONE;
+  for (uint32_t i = 0; i < backendList.Length(); ++i) {
+    BackendType type = BackendTypeForName(backendList[i]);
+    if (BackendTypeBit(type) & aBackendBitmask) {
+      allowedBackends |= BackendTypeBit(type);
+      if (result == BackendType::NONE) {
+        result = type;
+      }
+    }
+  }
+
+  aBackendBitmask = allowedBackends;
+  return result;
+}
+
+bool gfxPlatform::InSafeMode() {
+  static bool sSafeModeInitialized = false;
+  static bool sInSafeMode = false;
+
+  if (!sSafeModeInitialized) {
+    sSafeModeInitialized = true;
+    nsCOMPtr<nsIXULRuntime> xr = do_GetService("@mozilla.org/xre/runtime;1");
+    if (xr) {
+      xr->GetInSafeMode(&sInSafeMode);
+    }
+  }
+  return sInSafeMode;
+}
+
+bool gfxPlatform::OffMainThreadCompositingEnabled() {
+  return UsesOffMainThreadCompositing();
+}
+
+void gfxPlatform::SetCMSModeOverride(CMSMode aMode) {
+  MOZ_ASSERT(gCMSInitialized);
+  gCMSMode = aMode;
+}
+
+int gfxPlatform::GetRenderingIntent() {
+  // StaticPrefList.yaml is using 0 as the default for the rendering
+  // intent preference, based on that being the value for
+  // QCMS_INTENT_DEFAULT.  Assert here to catch if that ever
+  // changes and we can then figure out what to do about it.
+  MOZ_ASSERT(QCMS_INTENT_DEFAULT == 0);
+
+  /* Try to query the pref system for a rendering intent. */
+  int32_t pIntent = StaticPrefs::gfx_color_management_rendering_intent();
+  if ((pIntent < QCMS_INTENT_MIN) || (pIntent > QCMS_INTENT_MAX)) {
+    /* If the pref is out of range, use embedded profile. */
+    pIntent = -1;
+  }
+  return pIntent;
+}
+
+DeviceColor gfxPlatform::TransformPixel(const sRGBColor& in,
+                                        qcms_transform* transform) {
+  if (transform) {
+    /* we want the bytes in RGB order */
+#ifdef IS_LITTLE_ENDIAN
+    /* ABGR puts the bytes in |RGBA| order on little endian */
+    uint32_t packed = in.ToABGR();
+    qcms_transform_data(transform, (uint8_t*)&packed, (uint8_t*)&packed, 1);
+    auto out = DeviceColor::FromABGR(packed);
+#else
+    /* ARGB puts the bytes in |ARGB| order on big endian */
+    uint32_t packed = in.UnusualToARGB();
+    /* add one to move past the alpha byte */
+    qcms_transform_data(transform, (uint8_t*)&packed + 1, (uint8_t*)&packed + 1,
+                        1);
+    auto out = DeviceColor::UnusualFromARGB(packed);
+#endif
+    out.a = in.a;
+    return out;
+  }
+  return DeviceColor(in.r, in.g, in.b, in.a);
+}
+
+nsTArray<uint8_t> gfxPlatform::GetPrefCMSOutputProfileData() {
+  const auto mirror = StaticPrefs::gfx_color_management_display_profile();
+  const auto fname = *mirror;
+  if (fname == "") {
+    return nsTArray<uint8_t>();
+  }
+
+  void* mem = nullptr;
+  size_t size = 0;
+  qcms_data_from_path(fname.get(), &mem, &size);
+
+  nsTArray<uint8_t> result;
+
+  if (mem) {
+    result.AppendElements(static_cast<uint8_t*>(mem), size);
+    free(mem);
+  }
+
+  return result;
+}
+
+const mozilla::gfx::ContentDeviceData* gfxPlatform::GetInitContentDeviceData() {
+  return gContentDeviceInitData;
+}
+
+CMSMode GfxColorManagementMode() {
+  const auto mode = StaticPrefs::gfx_color_management_mode();
+  if (mode >= 0 && mode < UnderlyingValue(CMSMode::AllCount)) {
+    return CMSMode(mode);
+  }
+  return CMSMode::Off;
+}
+
+void gfxPlatform::InitializeCMS() {
+  if (gCMSInitialized) {
+    return;
+  }
+
+  if (XRE_IsGPUProcess()) {
+    // Colors in the GPU process should already be managed, so we don't need to
+    // perform color management there.
+    gCMSInitialized = true;
+    return;
+  }
+
+  MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread(),
+                        "CMS should be initialized on the main thread");
+  if (MOZ_UNLIKELY(!NS_IsMainThread())) {
+    return;
+  }
+
+  gCMSMode = GfxColorManagementMode();
+
+  gCMSsRGBProfile = qcms_profile_sRGB();
+
+  /* Determine if we're using the internal override to force sRGB as
+     an output profile for reftests. See Bug 452125.
+
+     Note that we don't normally (outside of tests) set a default value
+     of this preference, which means nsIPrefBranch::GetBoolPref will
+     typically throw (and leave its out-param untouched).
+   */
+  if (StaticPrefs::gfx_color_management_force_srgb() ||
+      StaticPrefs::gfx_color_management_native_srgb()) {
+    gCMSOutputProfile = gCMSsRGBProfile;
+  }
+
+  if (!gCMSOutputProfile) {
+    nsTArray<uint8_t> outputProfileData =
+        gfxPlatform::GetPlatform()->GetPlatformCMSOutputProfileData();
+    if (!outputProfileData.IsEmpty()) {
+      gCMSOutputProfile = qcms_profile_from_memory_curves_only(
+          outputProfileData.Elements(), outputProfileData.Length());
+    }
+  }
+
+  /* Determine if the profile looks bogus. If so, close the profile
+   * and use sRGB instead. See bug 460629, */
+  if (gCMSOutputProfile && qcms_profile_is_bogus(gCMSOutputProfile)) {
+    NS_ASSERTION(gCMSOutputProfile != gCMSsRGBProfile,
+                 "Builtin sRGB profile tagged as bogus!!!");
+    qcms_profile_release(gCMSOutputProfile);
+    gCMSOutputProfile = nullptr;
+  }
+
+  if (!gCMSOutputProfile) {
+    gCMSOutputProfile = gCMSsRGBProfile;
+  }
+
+  /* Precache the LUT16 Interpolations for the output profile. See
+     bug 444661 for details. */
+  qcms_profile_precache_output_transform(gCMSOutputProfile);
+
+  // Create the RGB transform.
+  gCMSRGBTransform =
+      qcms_transform_create(gCMSsRGBProfile, QCMS_DATA_RGB_8, gCMSOutputProfile,
+                            QCMS_DATA_RGB_8, QCMS_INTENT_PERCEPTUAL);
+
+  // And the inverse.
+  gCMSInverseRGBTransform =
+      qcms_transform_create(gCMSOutputProfile, QCMS_DATA_RGB_8, gCMSsRGBProfile,
+                            QCMS_DATA_RGB_8, QCMS_INTENT_PERCEPTUAL);
+
+  // The RGBA transform.
+  gCMSRGBATransform = qcms_transform_create(gCMSsRGBProfile, QCMS_DATA_RGBA_8,
+                                            gCMSOutputProfile, QCMS_DATA_RGBA_8,
+                                            QCMS_INTENT_PERCEPTUAL);
+
+  // And the BGRA one.
+  gCMSBGRATransform = qcms_transform_create(gCMSsRGBProfile, QCMS_DATA_BGRA_8,
+                                            gCMSOutputProfile, QCMS_DATA_BGRA_8,
+                                            QCMS_INTENT_PERCEPTUAL);
+
+  // FIXME: We only enable iccv4 after we create the platform profile, to
+  // wallpaper over bug 1697787.
+  //
+  // This should happen ideally right after setting gCMSMode.
+  if (StaticPrefs::gfx_color_management_enablev4()) {
+    qcms_enable_iccv4();
+  }
+
+  gCMSInitialized = true;
+}
+
+qcms_transform* gfxPlatform::GetCMSOSRGBATransform() {
+  switch (SurfaceFormat::OS_RGBA) {
+    case SurfaceFormat::B8G8R8A8:
+      return GetCMSBGRATransform();
+    case SurfaceFormat::R8G8B8A8:
+      return GetCMSRGBATransform();
+    default:
+      // We do not support color management with big endian.
+      return nullptr;
+  }
+}
+
+qcms_data_type gfxPlatform::GetCMSOSRGBAType() {
+  switch (SurfaceFormat::OS_RGBA) {
+    case SurfaceFormat::B8G8R8A8:
+      return QCMS_DATA_BGRA_8;
+    case SurfaceFormat::R8G8B8A8:
+      return QCMS_DATA_RGBA_8;
+    default:
+      // We do not support color management with big endian.
+      return QCMS_DATA_RGBA_8;
+  }
+}
+
+/* Shuts down various transforms and profiles for CMS. */
+void gfxPlatform::ShutdownCMS() {
+  if (gCMSRGBTransform) {
+    qcms_transform_release(gCMSRGBTransform);
+    gCMSRGBTransform = nullptr;
+  }
+  if (gCMSInverseRGBTransform) {
+    qcms_transform_release(gCMSInverseRGBTransform);
+    gCMSInverseRGBTransform = nullptr;
+  }
+  if (gCMSRGBATransform) {
+    qcms_transform_release(gCMSRGBATransform);
+    gCMSRGBATransform = nullptr;
+  }
+  if (gCMSBGRATransform) {
+    qcms_transform_release(gCMSBGRATransform);
+    gCMSBGRATransform = nullptr;
+  }
+  if (gCMSOutputProfile) {
+    qcms_profile_release(gCMSOutputProfile);
+
+    // handle the aliased case
+    if (gCMSsRGBProfile == gCMSOutputProfile) {
+      gCMSsRGBProfile = nullptr;
+    }
+    gCMSOutputProfile = nullptr;
+  }
+  if (gCMSsRGBProfile) {
+    qcms_profile_release(gCMSsRGBProfile);
+    gCMSsRGBProfile = nullptr;
+  }
+
+  // Reset the state variables
+  gCMSMode = CMSMode::Off;
+  gCMSInitialized = false;
+}
+
+uint32_t gfxPlatform::GetBidiNumeralOption() {
+  return StaticPrefs::bidi_numeral();
+}
+
+/* static */
+void gfxPlatform::FlushFontAndWordCaches() {
+  gfxFontCache* fontCache = gfxFontCache::GetCache();
+  if (fontCache) {
+    fontCache->Flush();
+  }
+
+  gfxPlatform::PurgeSkiaFontCache();
+}
+
+/* static */
+void gfxPlatform::ForceGlobalReflow(NeedsReframe aNeedsReframe,
+                                    BroadcastToChildren aBroadcastToChildren) {
+  MOZ_ASSERT(NS_IsMainThread());
+  const bool reframe = aNeedsReframe == NeedsReframe::Yes;
+  // Send a notification that will be observed by PresShells in this process
+  // only.
+  if (nsCOMPtr<nsIObserverService> obs = services::GetObserverService()) {
+    char16_t needsReframe[] = {char16_t(reframe), 0};
+    obs->NotifyObservers(nullptr, "font-info-updated", needsReframe);
+  }
+  if (XRE_IsParentProcess() &&
+      aBroadcastToChildren == BroadcastToChildren::Yes) {
+    // Propagate the change to child processes.
+    for (auto* process :
+         dom::ContentParent::AllProcesses(dom::ContentParent::eLive)) {
+      Unused << process->SendForceGlobalReflow(reframe);
+    }
+  }
+}
+
+void gfxPlatform::FontsPrefsChanged(const char* aPref) {
+  NS_ASSERTION(aPref != nullptr, "null preference");
+  if (!strcmp(GFX_DOWNLOADABLE_FONTS_ENABLED, aPref)) {
+    mAllowDownloadableFonts = UNINITIALIZED_VALUE;
+  } else if (!strcmp(GFX_PREF_WORD_CACHE_CHARLIMIT, aPref) ||
+             !strcmp(GFX_PREF_WORD_CACHE_MAXENTRIES, aPref) ||
+             !strcmp(GFX_PREF_GRAPHITE_SHAPING, aPref)) {
+    FlushFontAndWordCaches();
+  } else if (
+#if defined(XP_MACOSX)
+      !strcmp(GFX_PREF_CORETEXT_SHAPING, aPref) ||
+#endif
+      !strcmp("gfx.font_rendering.ahem_antialias_none", aPref)) {
+    FlushFontAndWordCaches();
+  } else if (!strcmp(GFX_PREF_OPENTYPE_SVG, aPref)) {
+    gfxFontCache::GetCache()->Flush();
+    gfxFontCache::GetCache()->NotifyGlyphsChanged();
+  }
+}
+
+mozilla::LogModule* gfxPlatform::GetLog(eGfxLog aWhichLog) {
+  // logs shared across gfx
+  static LazyLogModule sFontlistLog("fontlist");
+  static LazyLogModule sFontInitLog("fontinit");
+  static LazyLogModule sTextrunLog("textrun");
+  static LazyLogModule sTextrunuiLog("textrunui");
+  static LazyLogModule sCmapDataLog("cmapdata");
+  static LazyLogModule sTextPerfLog("textperf");
+
+  switch (aWhichLog) {
+    case eGfxLog_fontlist:
+      return sFontlistLog;
+    case eGfxLog_fontinit:
+      return sFontInitLog;
+    case eGfxLog_textrun:
+      return sTextrunLog;
+    case eGfxLog_textrunui:
+      return sTextrunuiLog;
+    case eGfxLog_cmapdata:
+      return sCmapDataLog;
+    case eGfxLog_textperf:
+      return sTextPerfLog;
+  }
+
+  MOZ_ASSERT_UNREACHABLE("Unexpected log type");
+  return nullptr;
+}
+
+RefPtr<mozilla::gfx::DrawTarget> gfxPlatform::ScreenReferenceDrawTarget() {
+  MOZ_ASSERT_IF(XRE_IsContentProcess(), NS_IsMainThread());
+  return (mScreenReferenceDrawTarget)
+             ? mScreenReferenceDrawTarget
+             : gPlatform->CreateOffscreenContentDrawTarget(
+                   IntSize(1, 1), SurfaceFormat::B8G8R8A8, true);
+}
+
+/* static */ RefPtr<mozilla::gfx::DrawTarget>
+gfxPlatform::ThreadLocalScreenReferenceDrawTarget() {
+  if (NS_IsMainThread() && gPlatform) {
+    return gPlatform->ScreenReferenceDrawTarget();
+  }
+
+  gfxPlatformWorker* platformWorker = gfxPlatformWorker::Get();
+  if (platformWorker) {
+    return platformWorker->ScreenReferenceDrawTarget();
+  }
+
+  return Factory::CreateDrawTarget(BackendType::SKIA, IntSize(1, 1),
+                                   SurfaceFormat::B8G8R8A8);
+}
+
+mozilla::gfx::SurfaceFormat gfxPlatform::Optimal2DFormatForContent(
+    gfxContentType aContent) {
+  switch (aContent) {
+    case gfxContentType::COLOR:
+      switch (GetOffscreenFormat()) {
+        case SurfaceFormat::A8R8G8B8_UINT32:
+          return mozilla::gfx::SurfaceFormat::B8G8R8A8;
+        case SurfaceFormat::X8R8G8B8_UINT32:
+          return mozilla::gfx::SurfaceFormat::B8G8R8X8;
+        case SurfaceFormat::R5G6B5_UINT16:
+          return mozilla::gfx::SurfaceFormat::R5G6B5_UINT16;
+        default:
+          MOZ_ASSERT_UNREACHABLE(
+              "unknown gfxImageFormat for "
+              "gfxContentType::COLOR");
+          return mozilla::gfx::SurfaceFormat::B8G8R8A8;
+      }
+    case gfxContentType::ALPHA:
+      return mozilla::gfx::SurfaceFormat::A8;
+    case gfxContentType::COLOR_ALPHA:
+      return mozilla::gfx::SurfaceFormat::B8G8R8A8;
+    default:
+      MOZ_ASSERT_UNREACHABLE("unknown gfxContentType");
+      return mozilla::gfx::SurfaceFormat::B8G8R8A8;
+  }
+}
+
+gfxImageFormat gfxPlatform::OptimalFormatForContent(gfxContentType aContent) {
+  switch (aContent) {
+    case gfxContentType::COLOR:
+      return GetOffscreenFormat();
+    case gfxContentType::ALPHA:
+      return SurfaceFormat::A8;
+    case gfxContentType::COLOR_ALPHA:
+      return SurfaceFormat::A8R8G8B8_UINT32;
+    default:
+      MOZ_ASSERT_UNREACHABLE("unknown gfxContentType");
+      return SurfaceFormat::A8R8G8B8_UINT32;
+  }
+}
+
+/**
+ * There are a number of layers acceleration (or layers in general) preferences
+ * that should be consistent for the lifetime of the application (bug 840967).
+ * As such, we will evaluate them all as soon as one of them is evaluated
+ * and remember the values.  Changing these preferences during the run will
+ * not have any effect until we restart.
+ */
+static mozilla::Atomic<bool> sLayersSupportsHardwareVideoDecoding(false);
+static bool sLayersHardwareVideoDecodingFailed = false;
+
+static mozilla::Atomic<bool> sLayersAccelerationPrefsInitialized(false);
+
+static void VideoDecodingFailedChangedCallback(const char* aPref, void*) {
+  sLayersHardwareVideoDecodingFailed = Preferences::GetBool(aPref, false);
+  gfxPlatform::GetPlatform()->UpdateCanUseHardwareVideoDecoding();
+}
+
+void gfxPlatform::UpdateCanUseHardwareVideoDecoding() {
+  if (XRE_IsParentProcess()) {
+    gfxVars::SetCanUseHardwareVideoDecoding(CanUseHardwareVideoDecoding());
+  }
+}
+
+void gfxPlatform::UpdateForceSubpixelAAWherePossible() {
+  bool forceSubpixelAAWherePossible =
+      StaticPrefs::gfx_webrender_quality_force_subpixel_aa_where_possible();
+  gfxVars::SetForceSubpixelAAWherePossible(forceSubpixelAAWherePossible);
+}
+
+void gfxPlatform::InitAcceleration() {
+  if (sLayersAccelerationPrefsInitialized) {
+    return;
+  }
+
+  InitCompositorAccelerationPrefs();
+
+  // If this is called for the first time on a non-main thread, we're screwed.
+  // At the moment there's no explicit guarantee that the main thread calls
+  // this before the compositor thread, but let's at least make the assumption
+  // explicit.
+  MOZ_ASSERT(NS_IsMainThread(), "can only initialize prefs on the main thread");
+
+#ifndef MOZ_WIDGET_GTK
+  nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
+  nsCString discardFailureId;
+  int32_t status;
+#endif
+
+  if (XRE_IsParentProcess()) {
+    gfxVars::SetBrowserTabsRemoteAutostart(BrowserTabsRemoteAutostart());
+    gfxVars::SetOffscreenFormat(GetOffscreenFormat());
+    gfxVars::SetRequiresAcceleratedGLContextForCompositorOGL(
+        RequiresAcceleratedGLContextForCompositorOGL());
+#ifdef XP_WIN
+    if (NS_SUCCEEDED(
+            gfxInfo->GetFeatureStatus(nsIGfxInfo::FEATURE_D3D11_KEYED_MUTEX,
+                                      discardFailureId, &status))) {
+      gfxVars::SetAllowD3D11KeyedMutex(status == nsIGfxInfo::FEATURE_STATUS_OK);
+    } else {
+      // If we couldn't properly evaluate the status, err on the side
+      // of caution and give this functionality to the user.
+      gfxCriticalNote << "Cannot evaluate keyed mutex feature status";
+      gfxVars::SetAllowD3D11KeyedMutex(true);
+    }
+    if (StaticPrefs::gfx_direct3d11_use_double_buffering() &&
+        IsWin10OrLater()) {
+      gfxVars::SetUseDoubleBufferingWithCompositor(true);
+    }
+#endif
+  }
+
+  if (StaticPrefs::media_hardware_video_decoding_enabled_AtStartup()) {
+#ifdef MOZ_WIDGET_GTK
+    sLayersSupportsHardwareVideoDecoding =
+        gfxPlatformGtk::GetPlatform()->InitVAAPIConfig(
+            StaticPrefs::
+                media_hardware_video_decoding_force_enabled_AtStartup() ||
+            StaticPrefs::media_ffmpeg_vaapi_enabled_AtStartup());
+#else
+    if (
+#  ifdef XP_WIN
+        Preferences::GetBool("media.wmf.dxva.enabled", true) &&
+#  endif
+        NS_SUCCEEDED(gfxInfo->GetFeatureStatus(
+            nsIGfxInfo::FEATURE_HARDWARE_VIDEO_DECODING, discardFailureId,
+            &status))) {
+      if (status == nsIGfxInfo::FEATURE_STATUS_OK ||
+          StaticPrefs::
+              media_hardware_video_decoding_force_enabled_AtStartup()) {
+        sLayersSupportsHardwareVideoDecoding = true;
+      }
+    }
+#endif
+  } else if (XRE_IsParentProcess()) {
+    FeatureState& feature =
+        gfxConfig::GetFeature(Feature::HARDWARE_VIDEO_DECODING);
+    feature.EnableByDefault();
+    feature.UserDisable("User disabled via pref",
+                        "FEATURE_HARDWARE_VIDEO_DECODING_PREF_DISABLED"_ns);
+  }
+
+  sLayersAccelerationPrefsInitialized = true;
+
+  if (XRE_IsParentProcess()) {
+    Preferences::RegisterCallbackAndCall(
+        VideoDecodingFailedChangedCallback,
+        "media.hardware-video-decoding.failed");
+    InitGPUProcessPrefs();
+
+    gfxVars::SetRemoteCanvasEnabled(StaticPrefs::gfx_canvas_remote() &&
+                                    gfxConfig::IsEnabled(Feature::GPU_PROCESS));
+  }
+}
+
+void gfxPlatform::InitGPUProcessPrefs() {
+  // We want to hide this from about:support, so only set a default if the
+  // pref is known to be true.
+  if (!StaticPrefs::layers_gpu_process_enabled_AtStartup() &&
+      !StaticPrefs::layers_gpu_process_force_enabled_AtStartup()) {
+    return;
+  }
+
+  FeatureState& gpuProc = gfxConfig::GetFeature(Feature::GPU_PROCESS);
+
+  // We require E10S - otherwise, there is very little benefit to the GPU
+  // process, since the UI process must still use acceleration for
+  // performance.
+  if (!BrowserTabsRemoteAutostart()) {
+    gpuProc.DisableByDefault(FeatureStatus::Unavailable,
+                             "Multi-process mode is not enabled",
+                             "FEATURE_FAILURE_NO_E10S"_ns);
+  } else {
+    gpuProc.SetDefaultFromPref(
+        StaticPrefs::GetPrefName_layers_gpu_process_enabled(), true,
+        StaticPrefs::GetPrefDefault_layers_gpu_process_enabled());
+  }
+
+  if (StaticPrefs::layers_gpu_process_force_enabled_AtStartup()) {
+    gpuProc.UserForceEnable("User force-enabled via pref");
+  }
+
+  nsCString message;
+  nsCString failureId;
+  if (!gfxPlatform::IsGfxInfoStatusOkay(nsIGfxInfo::FEATURE_GPU_PROCESS,
+                                        &message, failureId)) {
+    gpuProc.Disable(FeatureStatus::Blocklisted, message.get(), failureId);
+    return;
+  }
+
+  if (IsHeadless()) {
+    gpuProc.ForceDisable(FeatureStatus::Blocked, "Headless mode is enabled",
+                         "FEATURE_FAILURE_HEADLESS_MODE"_ns);
+    return;
+  }
+  if (InSafeMode()) {
+    gpuProc.ForceDisable(FeatureStatus::Blocked, "Safe-mode is enabled",
+                         "FEATURE_FAILURE_SAFE_MODE"_ns);
+    return;
+  }
+
+  InitPlatformGPUProcessPrefs();
+}
+
+void gfxPlatform::InitCompositorAccelerationPrefs() {
+  const char* acceleratedEnv = PR_GetEnv("MOZ_ACCELERATED");
+
+  FeatureState& feature = gfxConfig::GetFeature(Feature::HW_COMPOSITING);
+
+  // Base value - does the platform allow acceleration?
+  if (feature.SetDefault(AccelerateLayersByDefault(), FeatureStatus::Blocked,
+                         "Acceleration blocked by platform")) {
+    if (StaticPrefs::
+            layers_acceleration_disabled_AtStartup_DoNotUseDirectly()) {
+      feature.UserDisable("Disabled by layers.acceleration.disabled=true",
+                          "FEATURE_FAILURE_COMP_PREF"_ns);
+    } else if (acceleratedEnv && *acceleratedEnv == '0') {
+      feature.UserDisable("Disabled by envvar", "FEATURE_FAILURE_COMP_ENV"_ns);
+    }
+  } else {
+    if (acceleratedEnv && *acceleratedEnv == '1') {
+      feature.UserEnable("Enabled by envvar");
+    }
+  }
+
+  // This has specific meaning elsewhere, so we always record it.
+  if (StaticPrefs::
+          layers_acceleration_force_enabled_AtStartup_DoNotUseDirectly()) {
+    feature.UserForceEnable("Force-enabled by pref");
+  }
+
+  // Safe, headless, and record/replay modes override everything.
+  if (InSafeMode()) {
+    feature.ForceDisable(FeatureStatus::Blocked,
+                         "Acceleration blocked by safe-mode",
+                         "FEATURE_FAILURE_COMP_SAFEMODE"_ns);
+  }
+  if (IsHeadless()) {
+    feature.ForceDisable(FeatureStatus::Blocked,
+                         "Acceleration blocked by headless mode",
+                         "FEATURE_FAILURE_COMP_HEADLESSMODE"_ns);
+  }
+}
+
+/*static*/
+bool gfxPlatform::WebRenderPrefEnabled() {
+  return StaticPrefs::gfx_webrender_all_AtStartup() ||
+         StaticPrefs::gfx_webrender_enabled_AtStartup_DoNotUseDirectly();
+}
+
+/*static*/
+bool gfxPlatform::WebRenderEnvvarEnabled() {
+  const char* env = PR_GetEnv("MOZ_WEBRENDER");
+  return (env && *env == '1');
+}
+
+/* static */ const char* gfxPlatform::WebRenderResourcePathOverride() {
+  const char* resourcePath = PR_GetEnv("WR_RESOURCE_PATH");
+  if (!resourcePath || resourcePath[0] == '\0') {
+    return nullptr;
+  }
+  return resourcePath;
+}
+
+void gfxPlatform::InitWebRenderConfig() {
+  bool prefEnabled = WebRenderPrefEnabled();
+  bool envvarEnabled = WebRenderEnvvarEnabled();
+
+  // WR? WR+   => means WR was enabled via gfx.webrender.all.qualified on
+  //              qualified hardware
+  // WR! WR+   => means WR was enabled via gfx.webrender.{all,enabled} or
+  //              envvar, possibly on unqualified hardware
+  // In all cases WR- means WR was not enabled, for one of many possible
+  // reasons. Prior to bug 1523788 landing the gfx.webrender.{all,enabled}
+  // prefs only worked on Nightly so keep that in mind when looking at older
+  // crash reports.
+  ScopedGfxFeatureReporter reporter("WR", prefEnabled || envvarEnabled);
+  if (!XRE_IsParentProcess()) {
+    // The parent process runs through all the real decision-making code
+    // later in this function. For other processes we still want to report
+    // the state of the feature for crash reports.
+    reporter.SetSuccessful();
+    return;
+  }
+
+  // Update the gfxConfig feature states.
+  gfxConfigManager manager;
+  manager.Init();
+  manager.ConfigureWebRender();
+
+  bool hasHardware = gfxConfig::IsEnabled(Feature::WEBRENDER);
+
+#ifdef MOZ_WIDGET_GTK
+  // We require a hardware driver to back the GL context unless the user forced
+  // on WebRender.
+  if (!gfxConfig::IsForcedOnByUser(Feature::WEBRENDER) &&
+      StaticPrefs::gfx_webrender_reject_software_driver_AtStartup()) {
+    gfxVars::SetWebRenderRequiresHardwareDriver(true);
+  }
+#endif
+
+#ifdef XP_WIN
+  if (gfxConfig::IsEnabled(Feature::WEBRENDER_ANGLE)) {
+    gfxVars::SetUseWebRenderANGLE(true);
+  }
+#endif
+
+  if (gfxConfig::IsEnabled(Feature::WEBRENDER_SHADER_CACHE)) {
+    gfxVars::SetUseWebRenderProgramBinaryDisk(true);
+  }
+
+  gfxVars::SetUseWebRenderOptimizedShaders(
+      gfxConfig::IsEnabled(Feature::WEBRENDER_OPTIMIZED_SHADERS));
+
+  gfxVars::SetUseSoftwareWebRender(!hasHardware);
+
+  Preferences::RegisterPrefixCallbackAndCall(SwapIntervalPrefChangeCallback,
+                                             "gfx.swap-interval");
+
+  reporter.SetSuccessful();
+
+  Preferences::RegisterPrefixCallbackAndCall(WebRenderDebugPrefChangeCallback,
+                                             WR_DEBUG_PREF);
+
+  RegisterWebRenderBoolParamCallback();
+
+  Preferences::RegisterPrefixCallbackAndCall(
+      WebRendeProfilerUIPrefChangeCallback, "gfx.webrender.debug.profiler-ui");
+  Preferences::RegisterCallback(
+      WebRenderQualityPrefChangeCallback,
+      nsDependentCString(
+          StaticPrefs::
+              GetPrefName_gfx_webrender_quality_force_subpixel_aa_where_possible()));
+
+  Preferences::RegisterCallback(
+      WebRenderBatchingPrefChangeCallback,
+      nsDependentCString(
+          StaticPrefs::GetPrefName_gfx_webrender_batching_lookback()));
+
+  Preferences::RegisterCallbackAndCall(
+      WebRenderBlobTileSizePrefChangeCallback,
+      nsDependentCString(
+          StaticPrefs::GetPrefName_gfx_webrender_blob_tile_size()));
+
+  Preferences::RegisterCallbackAndCall(
+      WebRenderUploadThresholdPrefChangeCallback,
+      nsDependentCString(
+          StaticPrefs::GetPrefName_gfx_webrender_batched_upload_threshold()));
+
+  if (WebRenderResourcePathOverride()) {
+    CrashReporter::AnnotateCrashReport(
+        CrashReporter::Annotation::IsWebRenderResourcePathOverridden, true);
+  }
+
+  UpdateForceSubpixelAAWherePossible();
+
+#ifdef XP_WIN
+  if (gfxConfig::IsEnabled(Feature::WEBRENDER_DCOMP_PRESENT)) {
+    gfxVars::SetUseWebRenderDCompWin(true);
+  }
+  if (StaticPrefs::gfx_webrender_software_d3d11_AtStartup()) {
+    gfxVars::SetAllowSoftwareWebRenderD3D11(true);
+  }
+
+  const bool overlaySupported =
+      IsWin10AnniversaryUpdateOrLater() &&
+      gfxConfig::IsEnabled(Feature::WEBRENDER_COMPOSITOR);
+  MOZ_ASSERT_IF(overlaySupported,
+                gfxConfig::IsEnabled(Feature::WEBRENDER_DCOMP_PRESENT));
+
+  bool useVideoOverlay = false;
+  if (StaticPrefs::gfx_webrender_dcomp_video_overlay_win_AtStartup()) {
+    if (overlaySupported) {
+      useVideoOverlay = true;
+    }
+
+    if (useVideoOverlay &&
+        !StaticPrefs::
+            gfx_webrender_dcomp_video_overlay_win_force_enabled_AtStartup()) {
+      nsCString failureId;
+      int32_t status;
+      const nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
+      if (NS_FAILED(gfxInfo->GetFeatureStatus(nsIGfxInfo::FEATURE_VIDEO_OVERLAY,
+                                              failureId, &status))) {
+        FeatureState& feature = gfxConfig::GetFeature(Feature::VIDEO_OVERLAY);
+        feature.DisableByDefault(FeatureStatus::BlockedNoGfxInfo,
+                                 "gfxInfo is broken",
+                                 "FEATURE_FAILURE_WR_NO_GFX_INFO"_ns);
+        useVideoOverlay = false;
+      } else {
+        if (status != nsIGfxInfo::FEATURE_ALLOW_ALWAYS) {
+          FeatureState& feature = gfxConfig::GetFeature(Feature::VIDEO_OVERLAY);
+          feature.DisableByDefault(FeatureStatus::Blocked,
+                                   "Blocklisted by gfxInfo", failureId);
+          useVideoOverlay = false;
+        }
+      }
+    }
+  } else if (overlaySupported) {
+    FeatureState& feature = gfxConfig::GetFeature(Feature::VIDEO_OVERLAY);
+    feature.DisableByDefault(FeatureStatus::Blocked, "Disabled by pref",
+                             "FEATURE_FAILURE_DISABLED_BY_PREF"_ns);
+  }
+
+  if (useVideoOverlay) {
+    FeatureState& feature = gfxConfig::GetFeature(Feature::VIDEO_OVERLAY);
+    feature.EnableByDefault();
+    gfxVars::SetUseWebRenderDCompVideoOverlayWin(true);
+  }
+
+  if (useVideoOverlay &&
+      StaticPrefs::gfx_webrender_dcomp_video_sw_overlay_win_AtStartup()) {
+    gfxVars::SetUseWebRenderDCompSwVideoOverlayWin(true);
+  }
+
+  bool useHwVideoZeroCopy = false;
+  if (StaticPrefs::media_wmf_zero_copy_nv12_textures_AtStartup()) {
+    // XXX relax limitation to Windows 8.1
+    if (IsWin10OrLater() && hasHardware) {
+      useHwVideoZeroCopy = true;
+    }
+
+    if (useHwVideoZeroCopy &&
+        !StaticPrefs::
+            media_wmf_zero_copy_nv12_textures_force_enabled_AtStartup()) {
+      nsCString failureId;
+      int32_t status;
+      const nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
+      if (NS_FAILED(gfxInfo->GetFeatureStatus(
+              nsIGfxInfo::FEATURE_HW_DECODED_VIDEO_ZERO_COPY, failureId,
+              &status))) {
+        FeatureState& feature =
+            gfxConfig::GetFeature(Feature::HW_DECODED_VIDEO_ZERO_COPY);
+        feature.DisableByDefault(FeatureStatus::BlockedNoGfxInfo,
+                                 "gfxInfo is broken",
+                                 "FEATURE_FAILURE_WR_NO_GFX_INFO"_ns);
+        useHwVideoZeroCopy = false;
+      } else {
+        if (status != nsIGfxInfo::FEATURE_ALLOW_ALWAYS) {
+          FeatureState& feature =
+              gfxConfig::GetFeature(Feature::HW_DECODED_VIDEO_ZERO_COPY);
+          feature.DisableByDefault(FeatureStatus::Blocked,
+                                   "Blocklisted by gfxInfo", failureId);
+          useHwVideoZeroCopy = false;
+        }
+      }
+    }
+  }
+
+  if (useHwVideoZeroCopy) {
+    FeatureState& feature =
+        gfxConfig::GetFeature(Feature::HW_DECODED_VIDEO_ZERO_COPY);
+    feature.EnableByDefault();
+    gfxVars::SetHwDecodedVideoZeroCopy(true);
+  }
+
+  bool reuseDecoderDevice = false;
+  if (StaticPrefs::gfx_direct3d11_reuse_decoder_device_AtStartup()) {
+    reuseDecoderDevice = true;
+
+    if (reuseDecoderDevice &&
+        !StaticPrefs::
+            gfx_direct3d11_reuse_decoder_device_force_enabled_AtStartup()) {
+      nsCString failureId;
+      int32_t status;
+      const nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
+      if (NS_FAILED(gfxInfo->GetFeatureStatus(
+              nsIGfxInfo::FEATURE_REUSE_DECODER_DEVICE, failureId, &status))) {
+        FeatureState& feature =
+            gfxConfig::GetFeature(Feature::REUSE_DECODER_DEVICE);
+        feature.DisableByDefault(FeatureStatus::BlockedNoGfxInfo,
+                                 "gfxInfo is broken",
+                                 "FEATURE_FAILURE_WR_NO_GFX_INFO"_ns);
+        reuseDecoderDevice = false;
+      } else {
+        if (status != nsIGfxInfo::FEATURE_STATUS_OK) {
+          FeatureState& feature =
+              gfxConfig::GetFeature(Feature::REUSE_DECODER_DEVICE);
+          feature.DisableByDefault(FeatureStatus::Blocked,
+                                   "Blocklisted by gfxInfo", failureId);
+          reuseDecoderDevice = false;
+        }
+      }
+    }
+  }
+
+  if (reuseDecoderDevice) {
+    FeatureState& feature =
+        gfxConfig::GetFeature(Feature::REUSE_DECODER_DEVICE);
+    feature.EnableByDefault();
+    gfxVars::SetReuseDecoderDevice(true);
+  }
+
+  if (Preferences::GetBool("gfx.webrender.flip-sequential", false)) {
+    if (gfxVars::UseWebRenderANGLE()) {
+      gfxVars::SetUseWebRenderFlipSequentialWin(true);
+    }
+  }
+  if (Preferences::GetBool("gfx.webrender.triple-buffering.enabled", false)) {
+    if (gfxVars::UseWebRenderDCompWin() ||
+        gfxVars::UseWebRenderFlipSequentialWin()) {
+      gfxVars::SetUseWebRenderTripleBufferingWin(true);
+    }
+  }
+#endif
+
+  if (gfxConfig::IsEnabled(Feature::WEBRENDER_COMPOSITOR)) {
+    gfxVars::SetUseWebRenderCompositor(true);
+  }
+
+  Telemetry::ScalarSet(
+      Telemetry::ScalarID::GFX_OS_COMPOSITOR,
+      gfx::gfxConfig::IsEnabled(gfx::Feature::WEBRENDER_COMPOSITOR));
+
+  if (gfxConfig::IsEnabled(Feature::WEBRENDER_PARTIAL)) {
+    gfxVars::SetWebRenderMaxPartialPresentRects(
+        StaticPrefs::gfx_webrender_max_partial_present_rects_AtStartup());
+  }
+
+  // Set features that affect WR's RendererOptions
+  gfxVars::SetUseGLSwizzle(
+      IsFeatureSupported(nsIGfxInfo::FEATURE_GL_SWIZZLE, true));
+  gfxVars::SetUseWebRenderScissoredCacheClears(gfx::gfxConfig::IsEnabled(
+      gfx::Feature::WEBRENDER_SCISSORED_CACHE_CLEARS));
+
+  // The RemoveShaderCacheFromDiskIfNecessary() needs to be called after
+  // WebRenderConfig initialization.
+  gfxUtils::RemoveShaderCacheFromDiskIfNecessary();
+}
+
+void gfxPlatform::InitHardwareVideoConfig() {
+  if (!XRE_IsParentProcess()) {
+    return;
+  }
+
+#ifdef MOZ_WIDGET_GTK
+  // We don't want to expose codec info if whole HW decoding is disabled.
+  if (!sLayersSupportsHardwareVideoDecoding) {
+    return;
+  }
+#endif
+
+  nsCString message;
+  nsCString failureId;
+
+  FeatureState& featureVP8 = gfxConfig::GetFeature(Feature::VP8_HW_DECODE);
+  featureVP8.EnableByDefault();
+
+  if (!IsGfxInfoStatusOkay(nsIGfxInfo::FEATURE_VP8_HW_DECODE, &message,
+                           failureId)) {
+    featureVP8.Disable(FeatureStatus::Blocklisted, message.get(), failureId);
+  }
+  gfxVars::SetUseVP8HwDecode(featureVP8.IsEnabled());
+
+  FeatureState& featureVP9 = gfxConfig::GetFeature(Feature::VP9_HW_DECODE);
+  featureVP9.EnableByDefault();
+
+  if (!IsGfxInfoStatusOkay(nsIGfxInfo::FEATURE_VP9_HW_DECODE, &message,
+                           failureId)) {
+    featureVP9.Disable(FeatureStatus::Blocklisted, message.get(), failureId);
+  }
+  gfxVars::SetUseVP9HwDecode(featureVP9.IsEnabled());
+
+  // H264_HW_DECODE/AV1_HW_DECODE is used on Linux only right now.
+#ifdef MOZ_WIDGET_GTK
+  FeatureState& featureH264 = gfxConfig::GetFeature(Feature::H264_HW_DECODE);
+  featureH264.EnableByDefault();
+
+  if (!IsGfxInfoStatusOkay(nsIGfxInfo::FEATURE_H264_HW_DECODE, &message,
+                           failureId)) {
+    featureH264.Disable(FeatureStatus::Blocklisted, message.get(), failureId);
+  }
+  gfxVars::SetUseH264HwDecode(featureH264.IsEnabled());
+
+  FeatureState& featureAV1 = gfxConfig::GetFeature(Feature::AV1_HW_DECODE);
+  featureAV1.EnableByDefault();
+
+  if (!IsGfxInfoStatusOkay(nsIGfxInfo::FEATURE_AV1_HW_DECODE, &message,
+                           failureId)) {
+    featureAV1.Disable(FeatureStatus::Blocklisted, message.get(), failureId);
+  }
+  gfxVars::SetUseAV1HwDecode(featureAV1.IsEnabled());
+#endif
+}
+
+void gfxPlatform::InitWebGLConfig() {
+  if (!XRE_IsParentProcess()) return;
+
+  const nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
+
+  const auto IsFeatureOk = [&](const int32_t feature) {
+    nsCString discardFailureId;
+    int32_t status;
+    MOZ_RELEASE_ASSERT(NS_SUCCEEDED(
+        gfxInfo->GetFeatureStatus(feature, discardFailureId, &status)));
+    return (status == nsIGfxInfo::FEATURE_STATUS_OK);
+  };
+
+  gfxVars::SetAllowWebgl2(IsFeatureOk(nsIGfxInfo::FEATURE_WEBGL2));
+  gfxVars::SetWebglAllowWindowsNativeGl(
+      IsFeatureOk(nsIGfxInfo::FEATURE_WEBGL_OPENGL));
+  gfxVars::SetAllowWebglAccelAngle(
+      IsFeatureOk(nsIGfxInfo::FEATURE_WEBGL_ANGLE));
+  gfxVars::SetWebglUseHardware(
+      IsFeatureOk(nsIGfxInfo::FEATURE_WEBGL_USE_HARDWARE));
+
+  if (kIsMacOS) {
+    // Avoid crash for Intel HD Graphics 3000 on OSX. (Bug 1413269)
+    nsString vendorID, deviceID;
+    gfxInfo->GetAdapterVendorID(vendorID);
+    gfxInfo->GetAdapterDeviceID(deviceID);
+    if (vendorID.EqualsLiteral("0x8086") &&
+        (deviceID.EqualsLiteral("0x0116") ||
+         deviceID.EqualsLiteral("0x0126"))) {
+      gfxVars::SetWebglAllowCoreProfile(false);
+    }
+  }
+
+  bool allowWebGLOop =
+      IsFeatureOk(nsIGfxInfo::FEATURE_ALLOW_WEBGL_OUT_OF_PROCESS);
+  if (!kIsAndroid) {
+    gfxVars::SetAllowWebglOop(allowWebGLOop);
+  } else {
+    // On android, enable out-of-process WebGL only when GPU process exists.
+    gfxVars::SetAllowWebglOop(allowWebGLOop &&
+                              gfxConfig::IsEnabled(Feature::GPU_PROCESS));
+    // Enable gl::SharedSurface of AndroidHardwareBuffer when API version is 26+
+    // and out-of-process WebGL is enabled.
+#ifdef MOZ_WIDGET_ANDROID
+    if (gfxVars::AllowWebglOop() && jni::GetAPIVersion() >= 26 &&
+        StaticPrefs::webgl_out_of_process_enable_ahardwarebuffer_AtStartup()) {
+      gfxVars::SetUseAHardwareBufferSharedSurfaceWebglOop(true);
+    }
+#endif
+  }
+
+  bool threadsafeGL = IsFeatureOk(nsIGfxInfo::FEATURE_THREADSAFE_GL);
+  threadsafeGL |= StaticPrefs::webgl_threadsafe_gl_force_enabled_AtStartup();
+  threadsafeGL &= !StaticPrefs::webgl_threadsafe_gl_force_disabled_AtStartup();
+  gfxVars::SetSupportsThreadsafeGL(threadsafeGL);
+
+  FeatureState& feature =
+      gfxConfig::GetFeature(Feature::CANVAS_RENDERER_THREAD);
+  if (!threadsafeGL) {
+    feature.DisableByDefault(FeatureStatus::Blocked, "Thread unsafe GL",
+                             "FEATURE_FAILURE_THREAD_UNSAFE_GL"_ns);
+  } else if (!StaticPrefs::webgl_use_canvas_render_thread_AtStartup()) {
+    feature.DisableByDefault(FeatureStatus::Blocked, "Disabled by pref",
+                             "FEATURE_FAILURE_DISABLED_BY_PREF"_ns);
+  } else {
+    feature.EnableByDefault();
+  }
+  gfxVars::SetUseCanvasRenderThread(feature.IsEnabled());
+
+  bool webglOopAsyncPresentForceSync =
+      !gfxVars::UseCanvasRenderThread() ||
+      StaticPrefs::webgl_out_of_process_async_present_force_sync();
+  gfxVars::SetWebglOopAsyncPresentForceSync(webglOopAsyncPresentForceSync);
+
+  if (kIsAndroid) {
+    // Don't enable robust buffer access on Adreno 620 and 630 devices.
+    // It causes the linking of some shaders to fail. See bug 1485441 and
+    // bug 1810693.
+    nsAutoString renderer;
+    gfxInfo->GetAdapterDeviceID(renderer);
+    if ((renderer.Find(u"Adreno (TM) 620") != -1) ||
+        (renderer.Find(u"Adreno (TM) 630") != -1)) {
+      gfxVars::SetAllowEglRbab(false);
+    }
+  }
+
+  if (kIsWayland || kIsX11) {
+    nsCString discardFailureId;
+    int32_t status;
+    FeatureState& feature =
+        gfxConfig::GetFeature(Feature::DMABUF_SURFACE_EXPORT);
+    if (NS_FAILED(
+            gfxInfo->GetFeatureStatus(nsIGfxInfo::FEATURE_DMABUF_SURFACE_EXPORT,
+                                      discardFailureId, &status)) ||
+        status != nsIGfxInfo::FEATURE_STATUS_OK) {
+      feature.DisableByDefault(FeatureStatus::Blocked, "Blocklisted by gfxInfo",
+                               discardFailureId);
+      gfxVars::SetUseDMABufSurfaceExport(false);
+    } else {
+      feature.EnableByDefault();
+    }
+  }
+}
+
+void gfxPlatform::InitWebGPUConfig() {
+  if (!XRE_IsParentProcess()) {
+    return;
+  }
+
+  FeatureState& feature = gfxConfig::GetFeature(Feature::WEBGPU);
+  feature.EnableByDefault();
+
+  nsCString message;
+  nsCString failureId;
+  if (!IsGfxInfoStatusOkay(nsIGfxInfo::FEATURE_WEBGPU, &message, failureId)) {
+    if (StaticPrefs::gfx_webgpu_ignore_blocklist_AtStartup()) {
+      feature.UserForceEnable(
+          "Ignoring blocklist entry because of gfx.webgpu.force-enabled:true.");
+    }
+
+    feature.Disable(FeatureStatus::Blocklisted, message.get(), failureId);
+  }
+
+#ifdef RELEASE_OR_BETA
+  feature.ForceDisable(FeatureStatus::Blocked,
+                       "WebGPU cannot be enabled in release or beta",
+                       "WEBGPU_DISABLE_RELEASE_OR_BETA"_ns);
+#endif
+
+  gfxVars::SetAllowWebGPU(feature.IsEnabled());
+}
+
+#ifdef XP_WIN
+static void WindowOcclusionPrefChangeCallback(const char* aPref, void*) {
+  const char* env = PR_GetEnv("MOZ_WINDOW_OCCLUSION");
+  if (env) {
+    // env has a higher priority than pref.
+    return;
+  }
+
+  FeatureState& feature = gfxConfig::GetFeature(Feature::WINDOW_OCCLUSION);
+  bool enabled =
+      StaticPrefs::widget_windows_window_occlusion_tracking_enabled();
+
+  printf_stderr("Dynamically enable window occlusion %d\n", enabled);
+
+  // Update feature before calling WinUtils::EnableWindowOcclusion()
+  if (enabled) {
+    feature.UserEnable("User enabled by pref");
+  } else {
+    feature.UserDisable("User disabled via pref",
+                        "FEATURE_FAILURE_PREF_DISABLED"_ns);
+  }
+  widget::WinUtils::EnableWindowOcclusion(enabled);
+}
+#endif
+
+void gfxPlatform::InitWindowOcclusionConfig() {
+  if (!XRE_IsParentProcess()) {
+    return;
+  }
+#ifdef XP_WIN
+  FeatureState& feature = gfxConfig::GetFeature(Feature::WINDOW_OCCLUSION);
+  feature.SetDefaultFromPref(
+      StaticPrefs::
+          GetPrefName_widget_windows_window_occlusion_tracking_enabled(),
+      true,
+      StaticPrefs::
+          GetPrefDefault_widget_windows_window_occlusion_tracking_enabled());
+
+  const char* env = PR_GetEnv("MOZ_WINDOW_OCCLUSION");
+  if (env) {
+    if (*env == '1') {
+      feature.UserForceEnable("Force enabled by envvar");
+    } else {
+      feature.UserDisable("Force disabled by envvar",
+                          "FEATURE_FAILURE_OCCL_ENV"_ns);
+    }
+  }
+
+  Preferences::RegisterCallback(
+      WindowOcclusionPrefChangeCallback,
+      nsDependentCString(
+          StaticPrefs::
+              GetPrefName_widget_windows_window_occlusion_tracking_enabled()));
+#endif
+}
+
+static void BackdropFilterPrefChangeCallback(const char*, void*) {
+  FeatureState& feature = gfxConfig::GetFeature(Feature::BACKDROP_FILTER);
+
+  // We need to reset because the user status needs to be set before the
+  // environment status, but the environment status comes from the blocklist,
+  // and the user status can be updated after the fact.
+  feature.Reset();
+  feature.EnableByDefault();
+
+  if (StaticPrefs::layout_css_backdrop_filter_force_enabled()) {
+    feature.UserForceEnable("Force enabled by pref");
+  }
+
+  nsCString message;
+  nsCString failureId;
+  if (!gfxPlatform::IsGfxInfoStatusOkay(nsIGfxInfo::FEATURE_BACKDROP_FILTER,
+                                        &message, failureId)) {
+    feature.Disable(FeatureStatus::Blocklisted, message.get(), failureId);
+  }
+
+  // This may still be gated by the layout.css.backdrop-filter.enabled pref but
+  // the test infrastructure is very sensitive to how changes to that pref
+  // propagate, so we don't include them in the gfxVars/gfxFeature.
+  gfxVars::SetAllowBackdropFilter(feature.IsEnabled());
+}
+
+void gfxPlatform::InitBackdropFilterConfig() {
+  // This would ideally be in the nsCSSProps code
+  // but nsCSSProps is initialized before gfxPlatform
+  // so it has to be done here.
+  gfxVars::AddReceiver(&nsCSSProps::GfxVarReceiver());
+
+  if (!XRE_IsParentProcess()) {
+    // gfxVars doesn't notify receivers when initialized on content processes
+    // we need to explicitly recompute backdrop-filter's enabled state here.
+    nsCSSProps::RecomputeEnabledState(
+        StaticPrefs::GetPrefName_layout_css_backdrop_filter_enabled());
+    return;
+  }
+
+  BackdropFilterPrefChangeCallback(nullptr, nullptr);
+
+  Preferences::RegisterCallback(
+      BackdropFilterPrefChangeCallback,
+      nsDependentCString(
+          StaticPrefs::GetPrefName_layout_css_backdrop_filter_force_enabled()));
+}
+
+static void AcceleratedCanvas2DPrefChangeCallback(const char*, void*) {
+  FeatureState& feature = gfxConfig::GetFeature(Feature::ACCELERATED_CANVAS2D);
+
+  // Reset to track toggling prefs and ensure force-enable does not happen
+  // after blocklist.
+  feature.Reset();
+
+  // gfx.canvas.accelerated pref controls whether platform enables the feature,
+  // but it still allows blocklisting to override it later.
+  feature.SetDefaultFromPref(
+      StaticPrefs::GetPrefName_gfx_canvas_accelerated(), true,
+      StaticPrefs::GetPrefDefault_gfx_canvas_accelerated());
+
+  // gfx.canvas.accelerated.force-enabled overrides the blocklist.
+  if (StaticPrefs::gfx_canvas_accelerated_force_enabled()) {
+    feature.UserForceEnable("Force-enabled by pref");
+  }
+
+  if (kIsAndroid && !gfxConfig::IsEnabled(Feature::GPU_PROCESS)) {
+    feature.Disable(FeatureStatus::Blocked, "Disabled by GPU Process disabled",
+                    "FEATURE_FAILURE_DISABLED_BY_GPU_PROCESS_DISABLED"_ns);
+  } else if (!gfxConfig::IsEnabled(Feature::WEBRENDER)) {
+    // There isn't much benefit to accelerating Canvas2D if we can't accelerate
+    // WebRender itself.
+    feature.Disable(FeatureStatus::Blocked, "Disabled by Software WebRender",
+                    "FEATURE_FAILURE_DISABLED_BY_SOFTWARE_WEBRENDER"_ns);
+  }
+
+  // Check if blocklisted despite the default pref.
+  nsCString message;
+  nsCString failureId;
+  if (!gfxPlatform::IsGfxInfoStatusOkay(
+          nsIGfxInfo::FEATURE_ACCELERATED_CANVAS2D, &message, failureId)) {
+    feature.Disable(FeatureStatus::Blocklisted, message.get(), failureId);
+  }
+
+  gfxVars::SetUseAcceleratedCanvas2D(feature.IsEnabled());
+}
+
+void gfxPlatform::InitAcceleratedCanvas2DConfig() {
+  if (!XRE_IsParentProcess()) {
+    return;
+  }
+
+  // Decide during pref changes whether or not to enable acceleration. This
+  // allows easily toggling acceleration on and off to test performance.
+  AcceleratedCanvas2DPrefChangeCallback(nullptr, nullptr);
+
+  Preferences::RegisterCallback(
+      AcceleratedCanvas2DPrefChangeCallback,
+      nsDependentCString(StaticPrefs::GetPrefName_gfx_canvas_accelerated()));
+  Preferences::RegisterCallback(
+      AcceleratedCanvas2DPrefChangeCallback,
+      nsDependentCString(
+          StaticPrefs::GetPrefName_gfx_canvas_accelerated_force_enabled()));
+}
+
+bool gfxPlatform::CanUseHardwareVideoDecoding() {
+  // this function is called from the compositor thread, so it is not
+  // safe to init the prefs etc. from here.
+  MOZ_ASSERT(sLayersAccelerationPrefsInitialized);
+  return sLayersSupportsHardwareVideoDecoding &&
+         !sLayersHardwareVideoDecodingFailed;
+}
+
+bool gfxPlatform::AccelerateLayersByDefault() {
+#if defined(MOZ_GL_PROVIDER) || defined(MOZ_WIDGET_UIKIT)
+  return true;
+#else
+  return false;
+#endif
+}
+
+/* static */
+bool gfxPlatform::UsesOffMainThreadCompositing() {
+  if (XRE_GetProcessType() == GeckoProcessType_GPU) {
+    return true;
+  }
+
+  static bool firstTime = true;
+  static bool result = false;
+
+  if (firstTime) {
+    MOZ_ASSERT(sLayersAccelerationPrefsInitialized);
+    result = gfxVars::BrowserTabsRemoteAutostart() ||
+             !StaticPrefs::
+                 layers_offmainthreadcomposition_force_disabled_AtStartup();
+#if defined(MOZ_WIDGET_GTK)
+    // Linux users who chose OpenGL are being included in OMTC
+    result |= StaticPrefs::
+        layers_acceleration_force_enabled_AtStartup_DoNotUseDirectly();
+
+#endif
+    firstTime = false;
+  }
+
+  return result;
+}
+
+RefPtr<mozilla::VsyncDispatcher> gfxPlatform::GetGlobalVsyncDispatcher() {
+  MOZ_ASSERT(mVsyncDispatcher,
+             "mVsyncDispatcher should have been initialized by ReInitFrameRate "
+             "during gfxPlatform init");
+  MOZ_ASSERT(XRE_IsParentProcess());
+  return mVsyncDispatcher;
+}
+
+already_AddRefed<mozilla::gfx::VsyncSource>
+gfxPlatform::GetGlobalHardwareVsyncSource() {
+  if (!mGlobalHardwareVsyncSource) {
+    mGlobalHardwareVsyncSource = CreateGlobalHardwareVsyncSource();
+  }
+  return do_AddRef(mGlobalHardwareVsyncSource);
+}
+
+/***
+ * The preference "layout.frame_rate" has 3 meanings depending on the value:
+ *
+ * -1 = Auto (default), use hardware vsync or software vsync @ 60 hz if hw
+ *      vsync fails.
+ *  0 = ASAP mode - used during talos testing.
+ *  X = Software vsync at a rate of X times per second.
+ */
+already_AddRefed<mozilla::gfx::VsyncSource>
+gfxPlatform::GetSoftwareVsyncSource() {
+  if (!mSoftwareVsyncSource) {
+    double rateInMS = 1000.0 / (double)gfxPlatform::GetSoftwareVsyncRate();
+    mSoftwareVsyncSource = new mozilla::gfx::SoftwareVsyncSource(
+        TimeDuration::FromMilliseconds(rateInMS));
+  }
+  return do_AddRef(mSoftwareVsyncSource);
+}
+
+/* static */
+bool gfxPlatform::IsInLayoutAsapMode() {
+  // There are 2 modes of ASAP mode.
+  // 1 is that the refresh driver and compositor are in lock step
+  // the second is that the compositor goes ASAP and the refresh driver
+  // goes at whatever the configurated rate is. This only checks the version
+  // talos uses, which is the refresh driver and compositor are in lockstep.
+  // Ignore privacy_resistFingerprinting to preserve ASAP mode there.
+  return StaticPrefs::layout_frame_rate() == 0;
+}
+
+static int LayoutFrameRateFromPrefs() {
+  auto val = StaticPrefs::layout_frame_rate();
+  if (nsContentUtils::ShouldResistFingerprinting(
+          "The frame rate is a global property.")) {
+    val = 60;
+  }
+  return val;
+}
+
+/* static */
+bool gfxPlatform::ForceSoftwareVsync() {
+  return LayoutFrameRateFromPrefs() > 0;
+}
+
+/* static */
+int gfxPlatform::GetSoftwareVsyncRate() {
+  int preferenceRate = LayoutFrameRateFromPrefs();
+  if (preferenceRate <= 0) {
+    return gfxPlatform::GetDefaultFrameRate();
+  }
+  return preferenceRate;
+}
+
+/* static */
+int gfxPlatform::GetDefaultFrameRate() { return 60; }
+
+/* static */
+void gfxPlatform::ReInitFrameRate(const char* aPrefIgnored,
+                                  void* aDataIgnored) {
+  MOZ_RELEASE_ASSERT(XRE_IsParentProcess());
+
+  if (gPlatform->mSoftwareVsyncSource) {
+    // Update the rate of the existing software vsync source.
+    double rateInMS = 1000.0 / (double)gfxPlatform::GetSoftwareVsyncRate();
+    gPlatform->mSoftwareVsyncSource->SetVsyncRate(
+        TimeDuration::FromMilliseconds(rateInMS));
+  }
+
+  // Swap out the dispatcher's underlying source.
+  RefPtr<VsyncSource> vsyncSource =
+      gfxPlatform::ForceSoftwareVsync()
+          ? gPlatform->GetSoftwareVsyncSource()
+          : gPlatform->GetGlobalHardwareVsyncSource();
+  gPlatform->mVsyncDispatcher->SetVsyncSource(vsyncSource);
+}
+
+const char* gfxPlatform::GetAzureCanvasBackend() const {
+  BackendType backend{};
+
+  if (gfxConfig::IsEnabled(Feature::GPU_PROCESS)) {
+    // Assume content process' backend prefs.
+    BackendPrefsData data = GetBackendPrefs();
+    backend = GetCanvasBackendPref(data.mCanvasBitmask);
+    if (backend == BackendType::NONE) {
+      backend = data.mCanvasDefault;
+    }
+  } else {
+    backend = mPreferredCanvasBackend;
+  }
+
+  return GetBackendName(backend);
+}
+
+const char* gfxPlatform::GetAzureContentBackend() const {
+  BackendType backend{};
+
+  if (gfxConfig::IsEnabled(Feature::GPU_PROCESS)) {
+    // Assume content process' backend prefs.
+    BackendPrefsData data = GetBackendPrefs();
+    backend = GetContentBackendPref(data.mContentBitmask);
+    if (backend == BackendType::NONE) {
+      backend = data.mContentDefault;
+    }
+  } else {
+    backend = mContentBackend;
+  }
+
+  return GetBackendName(backend);
+}
+
+void gfxPlatform::GetAzureBackendInfo(mozilla::widget::InfoObject& aObj) {
+  if (gfxConfig::IsEnabled(Feature::GPU_PROCESS)) {
+    aObj.DefineProperty("AzureCanvasBackend (UI Process)",
+                        GetBackendName(mPreferredCanvasBackend));
+    aObj.DefineProperty("AzureFallbackCanvasBackend (UI Process)",
+                        GetBackendName(mFallbackCanvasBackend));
+    aObj.DefineProperty("AzureContentBackend (UI Process)",
+                        GetBackendName(mContentBackend));
+  } else {
+    aObj.DefineProperty("AzureFallbackCanvasBackend",
+                        GetBackendName(mFallbackCanvasBackend));
+  }
+
+  aObj.DefineProperty("AzureCanvasBackend", GetAzureCanvasBackend());
+  aObj.DefineProperty("AzureContentBackend", GetAzureContentBackend());
+}
+
+void gfxPlatform::GetApzSupportInfo(mozilla::widget::InfoObject& aObj) {
+  if (!gfxPlatform::AsyncPanZoomEnabled()) {
+    return;
+  }
+
+  if (SupportsApzWheelInput()) {
+    aObj.DefineProperty("ApzWheelInput", 1);
+  }
+
+  if (SupportsApzTouchInput()) {
+    aObj.DefineProperty("ApzTouchInput", 1);
+  }
+
+  if (SupportsApzDragInput()) {
+    aObj.DefineProperty("ApzDragInput", 1);
+  }
+
+  if (SupportsApzKeyboardInput() &&
+      !StaticPrefs::accessibility_browsewithcaret()) {
+    aObj.DefineProperty("ApzKeyboardInput", 1);
+  }
+
+  if (SupportsApzAutoscrolling()) {
+    aObj.DefineProperty("ApzAutoscrollInput", 1);
+  }
+
+  if (SupportsApzZooming()) {
+    aObj.DefineProperty("ApzZoomingInput", 1);
+  }
+}
+
+void gfxPlatform::GetFrameStats(mozilla::widget::InfoObject& aObj) {
+  uint32_t i = 0;
+  for (FrameStats& f : mFrameStats) {
+    nsPrintfCString name("Slow Frame #%02u", ++i);
+
+    nsPrintfCString value(
+        "Frame %" PRIu64
+        "(%s) CONTENT_FRAME_TIME %d - Transaction start %f, main-thread time "
+        "%f, full paint time %f, Skipped composites %u, Composite start %f, "
+        "Resource upload time %f, GPU cache upload time %f, Render time %f, "
+        "Composite time %f",
+        f.id().mId, f.url().get(), f.contentFrameTime(),
+        (f.transactionStart() - f.refreshStart()).ToMilliseconds(),
+        (f.fwdTime() - f.transactionStart()).ToMilliseconds(),
+        f.sceneBuiltTime()
+            ? (f.sceneBuiltTime() - f.transactionStart()).ToMilliseconds()
+            : 0.0,
+        f.skippedComposites(),
+        (f.compositeStart() - f.refreshStart()).ToMilliseconds(),
+        f.resourceUploadTime(), f.gpuCacheUploadTime(),
+        (f.compositeEnd() - f.renderStart()).ToMilliseconds(),
+        (f.compositeEnd() - f.compositeStart()).ToMilliseconds());
+    aObj.DefineProperty(name.get(), value.get());
+  }
+}
+
+void gfxPlatform::GetCMSSupportInfo(mozilla::widget::InfoObject& aObj) {
+  nsTArray<uint8_t> outputProfileData =
+      gfxPlatform::GetPlatform()->GetPlatformCMSOutputProfileData();
+  if (outputProfileData.IsEmpty()) {
+    nsPrintfCString msg("Empty profile data");
+    aObj.DefineProperty("CMSOutputProfile", msg.get());
+    return;
+  }
+
+  // Some profiles can be quite large. We don't want to include giant profiles
+  // by default in about:support. For now, we only accept less than 8kiB.
+  const size_t kMaxProfileSize = 8192;
+  if (outputProfileData.Length() >= kMaxProfileSize) {
+    nsPrintfCString msg("%zu bytes, too large", outputProfileData.Length());
+    aObj.DefineProperty("CMSOutputProfile", msg.get());
+    return;
+  }
+
+  nsString encodedProfile;
+  nsresult rv =
+      Base64Encode(reinterpret_cast<const char*>(outputProfileData.Elements()),
+                   outputProfileData.Length(), encodedProfile);
+  if (!NS_SUCCEEDED(rv)) {
+    nsPrintfCString msg("base64 encode failed 0x%08x",
+                        static_cast<uint32_t>(rv));
+    aObj.DefineProperty("CMSOutputProfile", msg.get());
+    return;
+  }
+
+  aObj.DefineProperty("CMSOutputProfile", encodedProfile);
+}
+
+void gfxPlatform::GetDisplayInfo(mozilla::widget::InfoObject& aObj) {
+  auto& screens = widget::ScreenManager::GetSingleton().CurrentScreenList();
+  aObj.DefineProperty("DisplayCount", screens.Length());
+
+  size_t i = 0;
+  for (auto& screen : screens) {
+    const LayoutDeviceIntRect rect = screen->GetRect();
+    nsPrintfCString value("%dx%d@%dHz scales:%f|%f", rect.width, rect.height,
+                          screen->GetRefreshRate(),
+                          screen->GetContentsScaleFactor(),
+                          screen->GetDefaultCSSScaleFactor());
+
+    aObj.DefineProperty(nsPrintfCString("Display%zu", i++).get(),
+                        NS_ConvertUTF8toUTF16(value));
+  }
+
+  // Platform display info is only currently used for about:support and getting
+  // it might fail in a child process anyway.
+  if (XRE_IsParentProcess()) {
+    GetPlatformDisplayInfo(aObj);
+  }
+}
+
+void gfxPlatform::GetOverlayInfo(mozilla::widget::InfoObject& aObj) {
+  if (mOverlayInfo.isNothing()) {
+    return;
+  }
+
+  auto toString = [](mozilla::layers::OverlaySupportType aType) -> const char* {
+    switch (aType) {
+      case mozilla::layers::OverlaySupportType::None:
+        return "None";
+      case mozilla::layers::OverlaySupportType::Software:
+        return "Software";
+      case mozilla::layers::OverlaySupportType::Direct:
+        return "Direct";
+      case mozilla::layers::OverlaySupportType::Scaling:
+        return "Scaling";
+      default:
+        MOZ_ASSERT_UNREACHABLE("Unexpected to be called");
+    }
+    MOZ_CRASH("Incomplete switch");
+  };
+
+  nsPrintfCString value("NV12=%s YUV2=%s BGRA8=%s RGB10A2=%s",
+                        toString(mOverlayInfo.ref().mNv12Overlay),
+                        toString(mOverlayInfo.ref().mYuy2Overlay),
+                        toString(mOverlayInfo.ref().mBgra8Overlay),
+                        toString(mOverlayInfo.ref().mRgb10a2Overlay));
+
+  aObj.DefineProperty("OverlaySupport", NS_ConvertUTF8toUTF16(value));
+}
+
+void gfxPlatform::GetSwapChainInfo(mozilla::widget::InfoObject& aObj) {
+  if (mSwapChainInfo.isNothing()) {
+    return;
+  }
+
+  auto toString = [](bool aTearingSupported) -> const char* {
+    if (aTearingSupported) {
+      return "Supported";
+    }
+    return "Not Supported";
+  };
+
+  nsPrintfCString value("%s", toString(mSwapChainInfo.ref().mTearingSupported));
+
+  aObj.DefineProperty("SwapChainTearingSupport", NS_ConvertUTF8toUTF16(value));
+}
+
+class FrameStatsComparator {
+ public:
+  bool Equals(const FrameStats& aA, const FrameStats& aB) const {
+    return aA.contentFrameTime() == aB.contentFrameTime();
+  }
+  // Reverse the condition here since we want the array sorted largest to
+  // smallest.
+  bool LessThan(const FrameStats& aA, const FrameStats& aB) const {
+    return aA.contentFrameTime() > aB.contentFrameTime();
+  }
+};
+
+void gfxPlatform::NotifyFrameStats(nsTArray<FrameStats>&& aFrameStats) {
+  if (!StaticPrefs::gfx_logging_slow_frames_enabled_AtStartup()) {
+    return;
+  }
+
+  FrameStatsComparator comp;
+  for (FrameStats& f : aFrameStats) {
+    mFrameStats.InsertElementSorted(f, comp);
+  }
+  if (mFrameStats.Length() > 10) {
+    mFrameStats.SetLength(10);
+  }
+}
+
+/*static*/
+uint32_t gfxPlatform::TargetFrameRate() {
+  if (gPlatform && gPlatform->mVsyncDispatcher) {
+    return round(1000.0 /
+                 gPlatform->mVsyncDispatcher->GetVsyncRate().ToMilliseconds());
+  }
+  return 0;
+}
+
+/* static */
+bool gfxPlatform::UseDesktopZoomingScrollbars() {
+  return StaticPrefs::apz_allow_zooming() &&
+         !StaticPrefs::apz_force_disable_desktop_zooming_scrollbars();
+}
+
+/*static*/
+bool gfxPlatform::AsyncPanZoomEnabled() {
+#if !defined(MOZ_WIDGET_ANDROID) && !defined(MOZ_WIDGET_UIKIT)
+  // For XUL applications (everything but Firefox on Android)
+  // we only want to use APZ when E10S is enabled. If
+  // we ever get input events off the main thread we can consider relaxing
+  // this requirement.
+  if (!BrowserTabsRemoteAutostart()) {
+    return false;
+  }
+#endif
+#ifdef MOZ_WIDGET_ANDROID
+  return true;
+#else
+  // If Fission is enabled, OOP iframes require APZ for hittest.  So, we
+  // need to forcibly enable APZ in that case for avoiding users confused.
+  if (FissionAutostart()) {
+    return true;
+  }
+  return StaticPrefs::
+      layers_async_pan_zoom_enabled_AtStartup_DoNotUseDirectly();
+#endif
+}
+
+/*static*/
+bool gfxPlatform::PerfWarnings() {
+  return StaticPrefs::gfx_perf_warnings_enabled();
+}
+
+void gfxPlatform::NotifyCompositorCreated(LayersBackend aBackend) {
+  if (mCompositorBackend == aBackend) {
+    return;
+  }
+
+  if (mCompositorBackend != LayersBackend::LAYERS_NONE) {
+    gfxCriticalNote << "Compositors might be mixed (" << int(mCompositorBackend)
+                    << "," << int(aBackend) << ")";
+  }
+
+  // Set the backend before we notify so it's available immediately.
+  mCompositorBackend = aBackend;
+
+  if (XRE_IsParentProcess()) {
+    Telemetry::ScalarSet(
+        Telemetry::ScalarID::GFX_COMPOSITOR,
+        NS_ConvertUTF8toUTF16(GetLayersBackendName(mCompositorBackend)));
+
+    nsCString geckoVersion;
+    nsCOMPtr<nsIXULAppInfo> app = do_GetService("@mozilla.org/xre/app-info;1");
+    if (app) {
+      app->GetVersion(geckoVersion);
+    }
+    Telemetry::ScalarSet(Telemetry::ScalarID::GFX_LAST_COMPOSITOR_GECKO_VERSION,
+                         NS_ConvertASCIItoUTF16(geckoVersion));
+
+    Telemetry::ScalarSet(
+        Telemetry::ScalarID::GFX_FEATURE_WEBRENDER,
+        NS_ConvertUTF8toUTF16(gfxConfig::GetFeature(gfx::Feature::WEBRENDER)
+                                  .GetStatusAndFailureIdString()));
+  }
+
+  // Notify that we created a compositor, so telemetry can update.
+  NS_DispatchToMainThread(
+      NS_NewRunnableFunction("gfxPlatform::NotifyCompositorCreated", [] {
+        if (nsCOMPtr<nsIObserverService> obsvc =
+                services::GetObserverService()) {
+          obsvc->NotifyObservers(nullptr, "compositor:created", nullptr);
+        }
+      }));
+}
+
+/* static */
+bool gfxPlatform::FallbackFromAcceleration(FeatureStatus aStatus,
+                                           const char* aMessage,
+                                           const nsACString& aFailureId,
+                                           bool aCrashAfterFinalFallback) {
+  // We always want to ensure (Hardware) WebRender is disabled.
+  if (gfxConfig::IsEnabled(Feature::WEBRENDER)) {
+    gfxConfig::GetFeature(Feature::WEBRENDER)
+        .ForceDisable(aStatus, aMessage, aFailureId);
+  }
+
+  // Determine whether or not we are allowed to use Software WebRender in
+  // fallback without the GPU process. Either the pref is false, or the feature
+  // is enabled and we are currently still using it.
+  bool swglFallbackAllowed =
+      !StaticPrefs::
+          gfx_webrender_fallback_software_requires_gpu_process_AtStartup() ||
+      gfxConfig::IsEnabled(Feature::GPU_PROCESS);
+
+#ifdef XP_WIN
+  // Before we disable D3D11 and HW_COMPOSITING, we should check if we can
+  // fallback from WebRender to Software WebRender + D3D11 compositing.
+  if (StaticPrefs::gfx_webrender_fallback_software_d3d11_AtStartup() &&
+      swglFallbackAllowed && gfxVars::AllowSoftwareWebRenderD3D11() &&
+      gfxConfig::IsEnabled(Feature::D3D11_COMPOSITING) &&
+      !gfxVars::UseSoftwareWebRender()) {
+    // Fallback to Software WebRender + D3D11 compositing.
+    gfxCriticalNote << "Fallback WR to SW-WR + D3D11";
+    gfxVars::SetUseSoftwareWebRender(true);
+    return true;
+  }
+
+  if (StaticPrefs::gfx_webrender_fallback_software_d3d11_AtStartup() &&
+      swglFallbackAllowed && gfxVars::AllowSoftwareWebRenderD3D11() &&
+      gfxVars::UseSoftwareWebRender()) {
+    // Fallback from Software WebRender + D3D11 to Software WebRender.
+    gfxCriticalNote << "Fallback SW-WR + D3D11 to SW-WR";
+    gfxVars::SetAllowSoftwareWebRenderD3D11(false);
+    return true;
+  }
+
+  // We aren't using Software WebRender + D3D11 compositing, so turn off the
+  // D3D11 and D2D.
+  if (gfxConfig::IsEnabled(Feature::DIRECT2D)) {
+    gfxConfig::GetFeature(Feature::DIRECT2D)
+        .ForceDisable(aStatus, aMessage, aFailureId);
+  }
+  if (gfxConfig::IsEnabled(Feature::D3D11_COMPOSITING)) {
+    gfxConfig::GetFeature(Feature::D3D11_COMPOSITING)
+        .ForceDisable(aStatus, aMessage, aFailureId);
+  }
+#endif
+
+#ifndef MOZ_WIDGET_ANDROID
+  // Non-Android wants to fallback to Software WebRender or Basic. Android wants
+  // to fallback to OpenGL.
+  if (gfxConfig::IsEnabled(Feature::HW_COMPOSITING)) {
+    gfxConfig::GetFeature(Feature::HW_COMPOSITING)
+        .ForceDisable(aStatus, aMessage, aFailureId);
+  }
+#endif
+
+  if (StaticPrefs::gfx_webrender_fallback_software_AtStartup() &&
+      swglFallbackAllowed && !gfxVars::UseSoftwareWebRender()) {
+    // Fallback from WebRender to Software WebRender.
+    gfxCriticalNote << "Fallback WR to SW-WR";
+    gfxVars::SetUseSoftwareWebRender(true);
+    return true;
+  }
+
+  if (!gfxVars::UseSoftwareWebRender()) {
+    // Software WebRender may be disabled due to a startup issue with the
+    // blocklist, despite it being our only fallback option based on the prefs.
+    // If WebRender is unable to be initialized, this means that user would
+    // otherwise get stuck with WebRender. As such, force a switch to Software
+    // WebRender in this case.
+    gfxCriticalNoteOnce << "Fallback WR to SW-WR, forced";
+    gfxVars::SetUseSoftwareWebRender(true);
+    return true;
+  }
+
+  if (aCrashAfterFinalFallback) {
+    MOZ_CRASH("Fallback configurations exhausted");
+  }
+
+  // Continue using Software WebRender (disabled fallback to Basic).
+  gfxCriticalNoteOnce << "Fallback remains SW-WR";
+  return false;
+}
+
+/* static */
+void gfxPlatform::DisableGPUProcess() {
+  gfxVars::SetRemoteCanvasEnabled(false);
+  if (kIsAndroid) {
+    // On android, enable out-of-process WebGL only when GPU process exists.
+    gfxVars::SetAllowWebglOop(false);
+    // On android, enable accelerated canvas only when GPU process exists.
+    gfxVars::SetUseAcceleratedCanvas2D(false);
+    gfxConfig::Disable(Feature::ACCELERATED_CANVAS2D, FeatureStatus::Blocked,
+                       "Disabled by GPU Process disabled",
+                       "FEATURE_FAILURE_DISABLED_BY_GPU_PROCESS_DISABLED"_ns);
+  }
+
+  RemoteTextureMap::Init();
+  if (gfxVars::UseCanvasRenderThread()) {
+    gfx::CanvasRenderThread::Start();
+  }
+  // We need to initialize the parent process to prepare for WebRender if we
+  // did not end up disabling it, despite losing the GPU process.
+  wr::RenderThread::Start(GPUProcessManager::Get()->AllocateNamespace());
+  image::ImageMemoryReporter::InitForWebRender();
+}
+
+void gfxPlatform::FetchAndImportContentDeviceData() {
+  MOZ_ASSERT(XRE_IsContentProcess());
+
+  if (gContentDeviceInitData) {
+    ImportContentDeviceData(*gContentDeviceInitData);
+    return;
+  }
+
+  mozilla::dom::ContentChild* cc = mozilla::dom::ContentChild::GetSingleton();
+
+  mozilla::gfx::ContentDeviceData data;
+  cc->SendGetGraphicsDeviceInitData(&data);
+
+  ImportContentDeviceData(data);
+}
+
+void gfxPlatform::ImportContentDeviceData(
+    const mozilla::gfx::ContentDeviceData& aData) {
+  MOZ_ASSERT(XRE_IsContentProcess());
+
+  const DevicePrefs& prefs = aData.prefs();
+  gfxConfig::Inherit(Feature::HW_COMPOSITING, prefs.hwCompositing());
+  gfxConfig::Inherit(Feature::OPENGL_COMPOSITING, prefs.oglCompositing());
+}
+
+void gfxPlatform::BuildContentDeviceData(
+    mozilla::gfx::ContentDeviceData* aOut) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  // Make sure our settings are synchronized from the GPU process.
+  DebugOnly<nsresult> rv = GPUProcessManager::Get()->EnsureGPUReady();
+  MOZ_ASSERT(rv != NS_ERROR_ILLEGAL_DURING_SHUTDOWN);
+
+  aOut->prefs().hwCompositing() = gfxConfig::GetValue(Feature::HW_COMPOSITING);
+  aOut->prefs().oglCompositing() =
+      gfxConfig::GetValue(Feature::OPENGL_COMPOSITING);
+}
+
+void gfxPlatform::ImportGPUDeviceData(
+    const mozilla::gfx::GPUDeviceData& aData) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  gfxConfig::ImportChange(Feature::OPENGL_COMPOSITING, aData.oglCompositing());
+}
+
+bool gfxPlatform::SupportsApzTouchInput() const {
+  return dom::TouchEvent::PrefEnabled(nullptr);
+}
+
+bool gfxPlatform::SupportsApzDragInput() const {
+  return StaticPrefs::apz_drag_enabled();
+}
+
+bool gfxPlatform::SupportsApzKeyboardInput() const {
+  return StaticPrefs::apz_keyboard_enabled_AtStartup();
+}
+
+bool gfxPlatform::SupportsApzAutoscrolling() const {
+  return StaticPrefs::apz_autoscroll_enabled();
+}
+
+bool gfxPlatform::SupportsApzZooming() const {
+  return StaticPrefs::apz_allow_zooming();
+}
+
+void gfxPlatform::InitOpenGLConfig() {
+#ifdef XP_WIN
+  // Don't enable by default on Windows, since it could show up in about:support
+  // even though it'll never get used. Only attempt if user enables the pref
+  if (!Preferences::GetBool("layers.prefer-opengl")) {
+    return;
+  }
+#endif
+
+  FeatureState& openGLFeature =
+      gfxConfig::GetFeature(Feature::OPENGL_COMPOSITING);
+
+  // Check to see hw comp supported
+  if (!gfxConfig::IsEnabled(Feature::HW_COMPOSITING)) {
+    openGLFeature.DisableByDefault(FeatureStatus::Unavailable,
+                                   "Hardware compositing is disabled",
+                                   "FEATURE_FAILURE_OPENGL_NEED_HWCOMP"_ns);
+    return;
+  }
+
+#ifdef XP_WIN
+  openGLFeature.SetDefaultFromPref(
+      StaticPrefs::GetPrefName_layers_prefer_opengl(), true,
+      StaticPrefs::GetPrefDefault_layers_prefer_opengl());
+#else
+  openGLFeature.EnableByDefault();
+#endif
+
+  // When layers acceleration is force-enabled, enable it even for blocklisted
+  // devices.
+  if (StaticPrefs::
+          layers_acceleration_force_enabled_AtStartup_DoNotUseDirectly()) {
+    openGLFeature.UserForceEnable("Force-enabled by pref");
+    return;
+  }
+
+  nsCString message;
+  nsCString failureId;
+  if (!IsGfxInfoStatusOkay(nsIGfxInfo::FEATURE_OPENGL_LAYERS, &message,
+                           failureId)) {
+    openGLFeature.Disable(FeatureStatus::Blocklisted, message.get(), failureId);
+  }
+}
+
+bool gfxPlatform::IsGfxInfoStatusOkay(int32_t aFeature, nsCString* aOutMessage,
+                                      nsCString& aFailureId) {
+  nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
+  if (!gfxInfo) {
+    return true;
+  }
+
+  int32_t status;
+  if (NS_SUCCEEDED(gfxInfo->GetFeatureStatus(aFeature, aFailureId, &status)) &&
+      status != nsIGfxInfo::FEATURE_STATUS_OK) {
+    aOutMessage->AssignLiteral("#BLOCKLIST_");
+    aOutMessage->AppendASCII(aFailureId.get());
+    return false;
+  }
+
+  return true;
+}