Add m-esr52 at 52.6.0

1 files changed, 2599 insertions, 0 deletions

diff --git a/gfx/thebes/gfxPlatform.cpp b/gfx/thebes/gfxPlatform.cpp
new file mode 100644
index 000000000..2e4ec990f
--- /dev/null
+++ b/gfx/thebes/gfxPlatform.cpp
@@ -0,0 +1,2599 @@
+/* -*- 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/layers/CompositorBridgeChild.h"
+#include "mozilla/layers/CompositorThread.h"
+#include "mozilla/layers/ImageBridgeChild.h"
+#include "mozilla/layers/ISurfaceAllocator.h"     // for GfxMemoryImageReporter
+#include "mozilla/gfx/gfxVars.h"
+#include "mozilla/gfx/GPUProcessManager.h"
+#include "mozilla/gfx/GraphicsMessages.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/Unused.h"
+
+#include "mozilla/Logging.h"
+#include "mozilla/Services.h"
+
+#include "gfxCrashReporterUtils.h"
+#include "gfxPlatform.h"
+#include "gfxPrefs.h"
+#include "gfxEnv.h"
+#include "gfxTextRun.h"
+#include "gfxConfig.h"
+#include "MediaPrefs.h"
+
+#ifdef XP_WIN
+#include <process.h>
+#define getpid _getpid
+#else
+#include <unistd.h>
+#endif
+
+#include "nsXULAppAPI.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsDirectoryServiceDefs.h"
+
+#if defined(XP_WIN)
+#include "gfxWindowsPlatform.h"
+#elif defined(XP_MACOSX)
+#include "gfxPlatformMac.h"
+#include "gfxQuartzSurface.h"
+#elif defined(MOZ_WIDGET_GTK)
+#include "gfxPlatformGtk.h"
+#elif defined(ANDROID)
+#include "gfxAndroidPlatform.h"
+#endif
+
+#ifdef XP_WIN
+#include "mozilla/WindowsVersion.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 "nsUnicodeRange.h"
+#include "nsServiceManagerUtils.h"
+#include "nsTArray.h"
+#include "nsILocaleService.h"
+#include "nsIObserverService.h"
+#include "nsIScreenManager.h"
+#include "FrameMetrics.h"
+#include "MainThreadUtils.h"
+#ifdef MOZ_CRASHREPORTER
+#include "nsExceptionHandler.h"
+#endif
+
+#include "nsWeakReference.h"
+
+#include "cairo.h"
+#include "qcms.h"
+
+#include "imgITools.h"
+
+#include "plstr.h"
+#include "nsCRT.h"
+#include "GLContext.h"
+#include "GLContextProvider.h"
+#include "mozilla/gfx/Logging.h"
+
+#if defined(MOZ_WIDGET_GTK)
+#include "gfxPlatformGtk.h" // xxx - for UseFcFontList
+#endif
+
+#ifdef MOZ_WIDGET_ANDROID
+#include "TexturePoolOGL.h"
+#endif
+
+#ifdef USE_SKIA
+# ifdef __GNUC__
+#  pragma GCC diagnostic push
+#  pragma GCC diagnostic ignored "-Wshadow"
+# endif
+# include "skia/include/core/SkGraphics.h"
+# ifdef USE_SKIA_GPU
+#  include "skia/include/gpu/GrContext.h"
+#  include "skia/include/gpu/gl/GrGLInterface.h"
+#  include "SkiaGLGlue.h"
+# endif
+# ifdef MOZ_ENABLE_FREETYPE
+#  include "skia/include/ports/SkTypeface_cairo.h"
+# endif
+# ifdef __GNUC__
+#  pragma GCC diagnostic pop // -Wshadow
+# endif
+static const uint32_t kDefaultGlyphCacheSize = -1;
+
+#endif
+
+#if !defined(USE_SKIA) || !defined(USE_SKIA_GPU)
+class mozilla::gl::SkiaGLGlue : public GenericAtomicRefCounted {
+};
+#endif
+
+#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 "gfxVR.h"
+#include "VRManagerChild.h"
+#include "mozilla/gfx/GPUParent.h"
+#include "prsystem.h"
+
+namespace mozilla {
+namespace layers {
+void ShutdownTileCache();
+} // namespace layers
+} // namespace mozilla
+
+using namespace mozilla;
+using namespace mozilla::layers;
+using namespace mozilla::gl;
+using namespace mozilla::gfx;
+
+gfxPlatform *gPlatform = nullptr;
+static bool gEverInitialized = false;
+
+static Mutex* gGfxPlatformPrefsLock = nullptr;
+
+// These two may point to the same profile
+static qcms_profile *gCMSOutputProfile = nullptr;
+static qcms_profile *gCMSsRGBProfile = nullptr;
+
+static qcms_transform *gCMSRGBTransform = nullptr;
+static qcms_transform *gCMSInverseRGBTransform = nullptr;
+static qcms_transform *gCMSRGBATransform = nullptr;
+
+static bool gCMSInitialized = false;
+static eCMSMode gCMSMode = eCMSMode_Off;
+
+static void ShutdownCMS();
+
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/SourceSurfaceCairo.h"
+using namespace mozilla::gfx;
+
+/* Class to listen for pref changes so that chrome code can dynamically
+   force sRGB as an output profile. See Bug #452125. */
+class SRGBOverrideObserver final : public nsIObserver,
+                                   public nsSupportsWeakReference
+{
+    ~SRGBOverrideObserver() {}
+public:
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIOBSERVER
+};
+
+/// 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(const char* aKey);
+  virtual void Log(const std::string& aString) override;
+  virtual void CrashAction(LogReason aReason) override;
+  virtual bool UpdateStringsVector(const std::string& aString) override;
+
+  virtual LoggingRecord LoggingRecordCopy() override;
+
+  void SetCircularBufferSize(uint32_t aCapacity);
+
+private:
+  // Helper for the Log()
+  void UpdateCrashReport();
+
+private:
+  LoggingRecord mBuffer;
+  nsCString mCrashCriticalKey;
+  uint32_t mMaxCapacity;
+  int32_t mIndex;
+  Mutex mMutex;
+};
+
+CrashStatsLogForwarder::CrashStatsLogForwarder(const char* 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());
+
+  bool ignored;
+  double tStamp = (TimeStamp::NowLoRes()-TimeStamp::ProcessCreation(ignored)).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 (LoggingRecord::iterator it = mBuffer.begin(); it != mBuffer.end(); ++it) {
+    message << logAnnotation << Get<0>(*it) << "]" << Get<1>(*it) << " (t=" << Get<2>(*it) << ") ";
+  }
+
+#ifdef MOZ_CRASHREPORTER
+  nsCString reportString(message.str().c_str());
+  nsresult annotated = CrashReporter::AnnotateCrashReport(mCrashCriticalKey, reportString);
+#else
+  nsresult annotated = NS_ERROR_NOT_IMPLEMENTED;
+#endif
+  if (annotated != NS_OK) {
+    printf("Crash Annotation %s: %s",
+           mCrashCriticalKey.get(), message.str().c_str());
+  }
+}
+
+class LogForwarderEvent : public Runnable
+{
+  virtual ~LogForwarderEvent() {}
+
+  NS_DECL_ISUPPORTS_INHERITED
+
+  explicit LogForwarderEvent(const nsCString& aMessage) : 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;
+};
+
+NS_IMPL_ISUPPORTS_INHERITED0(LogForwarderEvent, Runnable);
+
+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() {}
+
+  NS_DECL_ISUPPORTS_INHERITED
+
+  explicit CrashTelemetryEvent(uint32_t aReason) : mReason(aReason) {}
+
+  NS_IMETHOD Run() override {
+    MOZ_ASSERT(NS_IsMainThread());
+    Telemetry::Accumulate(Telemetry::GFX_CRASH, mReason);
+    return NS_OK;
+  }
+
+protected:
+  uint32_t mReason;
+};
+
+NS_IMPL_ISUPPORTS_INHERITED0(CrashTelemetryEvent, Runnable);
+
+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::GfxDevCrashTelemetry();
+#else
+  // Release builds use telemetry by default, but will crash instead
+  // if this environment variable is present.
+  static bool useTelemetry = !gfxEnv::GfxDevCrashMozCrash();
+#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");
+  }
+}
+
+NS_IMPL_ISUPPORTS(SRGBOverrideObserver, nsIObserver, nsISupportsWeakReference)
+
+#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"
+
+#define BIDI_NUMERAL_PREF "bidi.numeral"
+
+#define GFX_PREF_CMS_FORCE_SRGB "gfx.color_management.force_srgb"
+
+NS_IMETHODIMP
+SRGBOverrideObserver::Observe(nsISupports *aSubject,
+                              const char *aTopic,
+                              const char16_t* someData)
+{
+    NS_ASSERTION(NS_strcmp(someData,
+                           (u"" GFX_PREF_CMS_FORCE_SRGB)) == 0,
+                 "Restarting CMS on wrong pref!");
+    ShutdownCMS();
+    // Update current cms profile.
+    gfxPlatform::CreateCMSOutputProfile();
+    return NS_OK;
+}
+
+static const char* kObservedPrefs[] = {
+    "gfx.downloadable_fonts.",
+    "gfx.font_rendering.",
+    BIDI_NUMERAL_PREF,
+    nullptr
+};
+
+class FontPrefsObserver final : public nsIObserver
+{
+    ~FontPrefsObserver() {}
+public:
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIOBSERVER
+};
+
+NS_IMPL_ISUPPORTS(FontPrefsObserver, nsIObserver)
+
+NS_IMETHODIMP
+FontPrefsObserver::Observe(nsISupports *aSubject,
+                           const char *aTopic,
+                           const char16_t *someData)
+{
+    if (!someData) {
+        NS_ERROR("font pref observer code broken");
+        return NS_ERROR_UNEXPECTED;
+    }
+    NS_ASSERTION(gfxPlatform::GetPlatform(), "the singleton instance has gone");
+    gfxPlatform::GetPlatform()->FontsPrefsChanged(NS_ConvertUTF16toUTF8(someData).get());
+
+    return NS_OK;
+}
+
+class MemoryPressureObserver final : public nsIObserver
+{
+    ~MemoryPressureObserver() {}
+public:
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIOBSERVER
+};
+
+NS_IMPL_ISUPPORTS(MemoryPressureObserver, nsIObserver)
+
+NS_IMETHODIMP
+MemoryPressureObserver::Observe(nsISupports *aSubject,
+                                const char *aTopic,
+                                const char16_t *someData)
+{
+    NS_ASSERTION(strcmp(aTopic, "memory-pressure") == 0, "unexpected event topic");
+    Factory::PurgeAllCaches();
+    gfxGradientCache::PurgeAllCaches();
+
+    gfxPlatform::PurgeSkiaFontCache();
+    gfxPlatform::GetPlatform()->PurgeSkiaGPUCache();
+    return NS_OK;
+}
+
+gfxPlatform::gfxPlatform()
+  : mAzureCanvasBackendCollector(this, &gfxPlatform::GetAzureBackendInfo)
+  , mApzSupportCollector(this, &gfxPlatform::GetApzSupportInfo)
+  , mTilesInfoCollector(this, &gfxPlatform::GetTilesSupportInfo)
+  , mCompositorBackend(layers::LayersBackend::LAYERS_NONE)
+  , mScreenDepth(0)
+  , mDeviceCounter(0)
+{
+    mAllowDownloadableFonts = UNINITIALIZED_VALUE;
+    mFallbackUsesCmaps = UNINITIALIZED_VALUE;
+
+    mWordCacheCharLimit = UNINITIALIZED_VALUE;
+    mWordCacheMaxEntries = UNINITIALIZED_VALUE;
+    mGraphiteShapingEnabled = UNINITIALIZED_VALUE;
+    mOpenTypeSVGEnabled = UNINITIALIZED_VALUE;
+    mBidiNumeralOption = UNINITIALIZED_VALUE;
+
+    mSkiaGlue = nullptr;
+
+    uint32_t canvasMask = BackendTypeBit(BackendType::CAIRO);
+    uint32_t contentMask = BackendTypeBit(BackendType::CAIRO);
+#ifdef USE_SKIA
+    canvasMask |= BackendTypeBit(BackendType::SKIA);
+    contentMask |= BackendTypeBit(BackendType::SKIA);
+#endif
+    InitBackendPrefs(canvasMask, BackendType::CAIRO,
+                     contentMask, BackendType::CAIRO);
+
+    mTotalSystemMemory = PR_GetPhysicalMemorySize();
+
+    VRManager::ManagerInit();
+}
+
+gfxPlatform*
+gfxPlatform::GetPlatform()
+{
+    if (!gPlatform) {
+        Init();
+    }
+    return gPlatform;
+}
+
+bool
+gfxPlatform::Initialized()
+{
+  return !!gPlatform;
+}
+
+void RecordingPrefChanged(const char *aPrefName, void *aClosure)
+{
+  if (Preferences::GetBool("gfx.2d.recording", false)) {
+    nsAutoCString fileName;
+    nsAdoptingString prefFileName = Preferences::GetString("gfx.2d.recordingfile");
+
+    if (prefFileName) {
+      fileName.Append(NS_ConvertUTF16toUTF8(prefFileName));
+    } else {
+      nsCOMPtr<nsIFile> tmpFile;
+      if (NS_FAILED(NS_GetSpecialDirectory(NS_OS_TEMP_DIR, getter_AddRefs(tmpFile)))) {
+        return;
+      }
+      fileName.AppendPrintf("moz2drec_%i_%i.aer", XRE_GetProcessType(), getpid());
+
+      nsresult rv = tmpFile->AppendNative(fileName);
+      if (NS_FAILED(rv))
+        return;
+
+      rv = tmpFile->GetNativePath(fileName);
+      if (NS_FAILED(rv))
+        return;
+    }
+
+    gPlatform->mRecorder = Factory::CreateEventRecorderForFile(fileName.BeginReading());
+    printf_stderr("Recording to %s\n", fileName.get());
+    Factory::SetGlobalEventRecorder(gPlatform->mRecorder);
+  } else {
+    Factory::SetGlobalEventRecorder(nullptr);
+  }
+}
+
+#if defined(USE_SKIA)
+static uint32_t GetSkiaGlyphCacheSize()
+{
+    // Only increase font cache size on non-android to save memory.
+#if !defined(MOZ_WIDGET_ANDROID)
+    // 10mb as the default 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 proces
+    uint32_t cacheSize = 10 * 1024 * 1024;
+    if (mozilla::BrowserTabsRemoteAutostart()) {
+      return XRE_IsContentProcess() ? cacheSize : kDefaultGlyphCacheSize;
+    }
+
+    return cacheSize;
+#else
+    return kDefaultGlyphCacheSize;
+#endif // MOZ_WIDGET_ANDROID
+}
+#endif
+
+void
+gfxPlatform::Init()
+{
+    MOZ_RELEASE_ASSERT(!XRE_IsGPUProcess(), "GFX: Not allowed in GPU process.");
+    MOZ_RELEASE_ASSERT(NS_IsMainThread(), "GFX: Not in main thread.");
+
+    if (gEverInitialized) {
+        NS_RUNTIMEABORT("Already started???");
+    }
+    gEverInitialized = true;
+
+    // Initialize the preferences by creating the singleton.
+    gfxPrefs::GetSingleton();
+    MediaPrefs::GetSingleton();
+    gfxVars::Initialize();
+
+    gfxConfig::Init();
+
+    if (XRE_IsParentProcess()) {
+      GPUProcessManager::Initialize();
+
+      if (Preferences::GetBool("media.wmf.skip-blacklist")) {
+        gfxVars::SetPDMWMFDisableD3D11Dlls(nsCString());
+        gfxVars::SetPDMWMFDisableD3D9Dlls(nsCString());
+      } else {
+        gfxVars::SetPDMWMFDisableD3D11Dlls(Preferences::GetCString("media.wmf.disable-d3d11-for-dlls"));
+        gfxVars::SetPDMWMFDisableD3D9Dlls(Preferences::GetCString("media.wmf.disable-d3d9-for-dlls"));
+      }
+    }
+
+    // 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",
+                               gfxPrefs::Direct2DDisabled(),
+                               gfxPrefs::Direct2DForceEnabled());
+      // Layers prefs
+      forcedPrefs.AppendPrintf("-L%d%d%d%d",
+                               gfxPrefs::LayersAMDSwitchableGfxEnabled(),
+                               gfxPrefs::LayersAccelerationDisabledDoNotUseDirectly(),
+                               gfxPrefs::LayersAccelerationForceEnabledDoNotUseDirectly(),
+                               gfxPrefs::LayersD3D11ForceWARP());
+      // WebGL prefs
+      forcedPrefs.AppendPrintf("-W%d%d%d%d%d%d%d%d",
+                               gfxPrefs::WebGLANGLEForceD3D11(),
+                               gfxPrefs::WebGLANGLEForceWARP(),
+                               gfxPrefs::WebGLDisabled(),
+                               gfxPrefs::WebGLDisableANGLE(),
+                               gfxPrefs::WebGLDXGLEnabled(),
+                               gfxPrefs::WebGLForceEnabled(),
+                               gfxPrefs::WebGLForceLayersReadback(),
+                               gfxPrefs::WebGLForceMSAA());
+      // Prefs that don't fit into any of the other sections
+      forcedPrefs.AppendPrintf("-T%d%d%d%d) ",
+                               gfxPrefs::AndroidRGB16Force(),
+                               gfxPrefs::CanvasAzureAccelerated(),
+                               gfxPrefs::DisableGralloc(),
+                               gfxPrefs::ForceShmemTiles());
+      ScopedGfxFeatureReporter::AppNote(forcedPrefs);
+    }
+
+    InitMoz2DLogging();
+
+    gGfxPlatformPrefsLock = new Mutex("gfxPlatform::gGfxPlatformPrefsLock");
+
+    /* 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 = services::GetGfxInfo();
+
+#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->InitAcceleration();
+
+    if (gfxConfig::IsEnabled(Feature::GPU_PROCESS)) {
+      GPUProcessManager* gpu = GPUProcessManager::Get();
+      gpu->LaunchGPUProcess();
+    }
+
+    if (XRE_IsParentProcess()) {
+      if (gfxPlatform::ForceSoftwareVsync()) {
+        gPlatform->mVsyncSource = (gPlatform)->gfxPlatform::CreateHardwareVsyncSource();
+      } else {
+        gPlatform->mVsyncSource = gPlatform->CreateHardwareVsyncSource();
+      }
+    }
+
+#ifdef USE_SKIA
+    SkGraphics::Init();
+#  ifdef MOZ_ENABLE_FREETYPE
+    SkInitCairoFT(gPlatform->FontHintingEnabled());
+#  endif
+#endif
+
+#ifdef MOZ_GL_DEBUG
+    GLContext::StaticInit();
+#endif
+
+    InitLayersIPC();
+
+    gPlatform->PopulateScreenInfo();
+    gPlatform->ComputeTileSize();
+
+    nsresult rv;
+
+    bool usePlatformFontList = true;
+#if defined(MOZ_WIDGET_GTK)
+    usePlatformFontList = gfxPlatformGtk::UseFcFontList();
+#endif
+
+    if (usePlatformFontList) {
+        rv = gfxPlatformFontList::Init();
+        if (NS_FAILED(rv)) {
+            NS_RUNTIMEABORT("Could not initialize gfxPlatformFontList");
+        }
+    }
+
+    gPlatform->mScreenReferenceSurface =
+        gPlatform->CreateOffscreenSurface(IntSize(1, 1),
+                                          SurfaceFormat::A8R8G8B8_UINT32);
+    if (!gPlatform->mScreenReferenceSurface) {
+        NS_RUNTIMEABORT("Could not initialize mScreenReferenceSurface");
+    }
+
+    gPlatform->mScreenReferenceDrawTarget =
+        gPlatform->CreateOffscreenContentDrawTarget(IntSize(1, 1),
+                                                    SurfaceFormat::B8G8R8A8);
+    if (!gPlatform->mScreenReferenceDrawTarget ||
+        !gPlatform->mScreenReferenceDrawTarget->IsValid()) {
+      NS_RUNTIMEABORT("Could not initialize mScreenReferenceDrawTarget");
+    }
+
+    rv = gfxFontCache::Init();
+    if (NS_FAILED(rv)) {
+        NS_RUNTIMEABORT("Could not initialize gfxFontCache");
+    }
+
+    /* Create and register our CMS Override observer. */
+    gPlatform->mSRGBOverrideObserver = new SRGBOverrideObserver();
+    Preferences::AddWeakObserver(gPlatform->mSRGBOverrideObserver, GFX_PREF_CMS_FORCE_SRGB);
+
+    gPlatform->mFontPrefsObserver = new FontPrefsObserver();
+    Preferences::AddStrongObservers(gPlatform->mFontPrefsObserver, kObservedPrefs);
+
+    GLContext::PlatformStartup();
+
+#ifdef MOZ_WIDGET_ANDROID
+    // Texture pool init
+    TexturePoolOGL::Init();
+#endif
+
+    Preferences::RegisterCallbackAndCall(RecordingPrefChanged, "gfx.2d.recording", nullptr);
+
+    CreateCMSOutputProfile();
+
+    // Listen to memory pressure event so we can purge DrawTarget caches
+    nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+    if (obs) {
+        gPlatform->mMemoryPressureObserver = new MemoryPressureObserver();
+        obs->AddObserver(gPlatform->mMemoryPressureObserver, "memory-pressure", false);
+    }
+
+    // Request the imgITools service, implicitly initializing ImageLib.
+    nsCOMPtr<imgITools> imgTools = do_GetService("@mozilla.org/image/tools;1");
+    if (!imgTools) {
+      NS_RUNTIMEABORT("Could not initialize ImageLib");
+    }
+
+    RegisterStrongMemoryReporter(new GfxMemoryImageReporter());
+
+#ifdef USE_SKIA
+    uint32_t skiaCacheSize = GetSkiaGlyphCacheSize();
+    if (skiaCacheSize != kDefaultGlyphCacheSize) {
+      SkGraphics::SetFontCacheLimit(skiaCacheSize);
+    }
+#endif
+
+    InitNullMetadata();
+    InitOpenGLConfig();
+
+    if (obs) {
+      obs->NotifyObservers(nullptr, "gfx-features-ready", nullptr);
+    }
+}
+
+/* static */ void
+gfxPlatform::InitMoz2DLogging()
+{
+    auto fwd = new CrashStatsLogForwarder("GraphicsCriticalError");
+    fwd->SetCircularBufferSize(gfxPrefs::GfxLoggingCrashLength());
+
+    mozilla::gfx::Config cfg;
+    cfg.mLogForwarder = fwd;
+    cfg.mMaxTextureSize = gfxPrefs::MaxTextureSize();
+    cfg.mMaxAllocSize = gfxPrefs::MaxAllocSize();
+
+    gfx::Factory::Init(cfg);
+}
+
+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();
+    gfxFontGroup::Shutdown();
+    gfxGradientCache::Shutdown();
+    gfxAlphaBoxBlur::ShutdownBlurCache();
+    gfxGraphiteShaper::Shutdown();
+    gfxPlatformFontList::Shutdown();
+    ShutdownTileCache();
+
+    // Free the various non-null transforms and loaded profiles
+    ShutdownCMS();
+
+    /* Unregister our CMS Override callback. */
+    NS_ASSERTION(gPlatform->mSRGBOverrideObserver, "mSRGBOverrideObserver has alreay gone");
+    Preferences::RemoveObserver(gPlatform->mSRGBOverrideObserver, GFX_PREF_CMS_FORCE_SRGB);
+    gPlatform->mSRGBOverrideObserver = nullptr;
+
+    NS_ASSERTION(gPlatform->mFontPrefsObserver, "mFontPrefsObserver has alreay gone");
+    Preferences::RemoveObservers(gPlatform->mFontPrefsObserver, kObservedPrefs);
+    gPlatform->mFontPrefsObserver = nullptr;
+
+    NS_ASSERTION(gPlatform->mMemoryPressureObserver, "mMemoryPressureObserver has already gone");
+    nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+    if (obs) {
+        obs->RemoveObserver(gPlatform->mMemoryPressureObserver, "memory-pressure");
+    }
+
+    gPlatform->mMemoryPressureObserver = nullptr;
+    gPlatform->mSkiaGlue = nullptr;
+
+    if (XRE_IsParentProcess()) {
+      gPlatform->mVsyncSource->Shutdown();
+    }
+
+    gPlatform->mVsyncSource = nullptr;
+
+#ifdef MOZ_WIDGET_ANDROID
+    // Shut down the texture pool
+    TexturePoolOGL::Shutdown();
+#endif
+
+    // 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();
+    }
+
+    gfx::Factory::ShutDown();
+
+    delete gGfxPlatformPrefsLock;
+
+    gfxVars::Shutdown();
+    gfxPrefs::DestroySingleton();
+    gfxFont::DestroySingletons();
+
+    gfxConfig::Shutdown();
+
+    gPlatform->WillShutdown();
+
+    delete gPlatform;
+    gPlatform = nullptr;
+}
+
+/* static */ void
+gfxPlatform::InitLayersIPC()
+{
+    if (sLayersIPCIsUp) {
+      return;
+    }
+    sLayersIPCIsUp = true;
+
+    if (XRE_IsParentProcess())
+    {
+        layers::CompositorThreadHolder::Start();
+    }
+}
+
+/* static */ void
+gfxPlatform::ShutdownLayersIPC()
+{
+    if (!sLayersIPCIsUp) {
+      return;
+    }
+    sLayersIPCIsUp = false;
+
+    if (XRE_IsContentProcess()) {
+        gfx::VRManagerChild::ShutDown();
+        // cf bug 1215265.
+        if (gfxPrefs::ChildProcessShutdown()) {
+          layers::CompositorBridgeChild::ShutDown();
+          layers::ImageBridgeChild::ShutDown();
+        }
+    } else if (XRE_IsParentProcess()) {
+        gfx::VRManagerChild::ShutDown();
+        layers::CompositorBridgeChild::ShutDown();
+        layers::ImageBridgeChild::ShutDown();
+
+        // This has to happen after shutting down the child protocols.
+        layers::CompositorThreadHolder::Shutdown();
+    } 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;
+}
+
+gfxPlatform::~gfxPlatform()
+{
+    // 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
+#ifdef USE_SKIA
+    // must do Skia cleanup before Cairo cleanup, because Skia may be referencing
+    // Cairo objects e.g. through SkCairoFTTypeface
+    SkGraphics::PurgeFontCache();
+#endif
+
+#if MOZ_TREE_CAIRO
+    cairo_debug_reset_static_data();
+#endif
+#endif
+}
+
+/* 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;
+};
+
+void SourceBufferDestroy(void *srcSurfUD)
+{
+  delete static_cast<SourceSurfaceUserData*>(srcSurfUD);
+}
+
+UserDataKey kThebesSurface;
+
+struct DependentSourceSurfaceUserData
+{
+  RefPtr<gfxASurface> mSurface;
+};
+
+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(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.
+  SourceSurfaceUserData *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.
+  DependentSourceSurfaceUserData *srcSurfUD = new DependentSourceSurfaceUserData;
+  srcSurfUD->mSurface = aSurface;
+  result->AddUserData(&kThebesSurface, srcSurfUD, SourceSurfaceDestroyed);
+
+  return result.forget();
+}
+
+already_AddRefed<ScaledFont>
+gfxPlatform::GetScaledFontForFont(DrawTarget* aTarget, gfxFont *aFont)
+{
+  NativeFont nativeFont;
+  nativeFont.mType = NativeFontType::CAIRO_FONT_FACE;
+  nativeFont.mFont = aFont->GetCairoScaledFont();
+  return Factory::CreateScaledFontForNativeFont(nativeFont,
+                                                aFont->GetAdjustedSize());
+}
+
+void
+gfxPlatform::ComputeTileSize()
+{
+  // The tile size should be picked in the parent processes
+  // and sent to the child processes over IPDL GetTileSize.
+  if (!XRE_IsParentProcess()) {
+    return;
+  }
+
+  int32_t w = gfxPrefs::LayersTileWidth();
+  int32_t h = gfxPrefs::LayersTileHeight();
+
+  if (gfxPrefs::LayersTilesAdjust()) {
+    gfx::IntSize screenSize = GetScreenSize();
+    if (screenSize.width > 0) {
+      // Choose a size so that there are between 2 and 4 tiles per screen width.
+      // FIXME: we should probably make sure this is within the max texture size,
+      // but I think everything should at least support 1024
+      w = h = clamped(int32_t(RoundUpPow2(screenSize.width)) / 4, 256, 1024);
+    }
+  }
+
+  // Don't allow changing the tile size after we've set it.
+  // Right now the code assumes that the tile size doesn't change.
+  MOZ_ASSERT(gfxVars::TileSize().width == -1 &&
+             gfxVars::TileSize().height == -1);
+
+  gfxVars::SetTileSize(IntSize(w, h));
+}
+
+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);
+
+  int left, top;
+  screen->GetRect(&left, &top, &mScreenSize.width, &mScreenSize.height);
+}
+
+bool
+gfxPlatform::SupportsAzureContentForDrawTarget(DrawTarget* aTarget)
+{
+  if (!aTarget || !aTarget->IsValid()) {
+    return false;
+  }
+
+#ifdef USE_SKIA_GPU
+ // Skia content rendering doesn't support GPU acceleration, so we can't
+ // use the same backend if the current backend is accelerated.
+ if ((aTarget->GetType() == DrawTargetType::HARDWARE_RASTER)
+     && (aTarget->GetBackendType() ==  BackendType::SKIA))
+ {
+  return false;
+ }
+#endif
+
+  return SupportsAzureContentForType(aTarget->GetBackendType());
+}
+
+bool gfxPlatform::AllowOpenGLCanvas()
+{
+  // For now, only allow Skia+OpenGL, unless it's blocked.
+  // Allow acceleration on Skia if the preference is set, unless it's blocked
+  // as long as we have the accelerated layers
+
+  // The compositor backend is only set correctly in the parent process,
+  // so we let content process always assume correct compositor backend.
+  // The callers have to do the right thing.
+  bool correctBackend = !XRE_IsParentProcess() ||
+    ((mCompositorBackend == LayersBackend::LAYERS_OPENGL) &&
+     (GetContentBackendFor(mCompositorBackend) == BackendType::SKIA));
+
+  if (gfxPrefs::CanvasAzureAccelerated() && correctBackend) {
+    nsCOMPtr<nsIGfxInfo> gfxInfo = do_GetService("@mozilla.org/gfx/info;1");
+    int32_t status;
+    nsCString discardFailureId;
+    return !gfxInfo ||
+      (NS_SUCCEEDED(gfxInfo->GetFeatureStatus(nsIGfxInfo::FEATURE_CANVAS2D_ACCELERATION,
+                                              discardFailureId,
+                                              &status)) &&
+       status == nsIGfxInfo::FEATURE_STATUS_OK);
+  }
+  return false;
+}
+
+void
+gfxPlatform::InitializeSkiaCacheLimits()
+{
+  if (AllowOpenGLCanvas()) {
+#ifdef USE_SKIA_GPU
+    bool usingDynamicCache = gfxPrefs::CanvasSkiaGLDynamicCache();
+    int cacheItemLimit = gfxPrefs::CanvasSkiaGLCacheItems();
+    uint64_t cacheSizeLimit = std::max(gfxPrefs::CanvasSkiaGLCacheSize(), (int32_t)0);
+
+    // Prefs are in megabytes, but we want the sizes in bytes
+    cacheSizeLimit *= 1024*1024;
+
+    if (usingDynamicCache) {
+      if (mTotalSystemMemory < 512*1024*1024) {
+        // We need a very minimal cache on anything smaller than 512mb.
+        // Note the large jump as we cross 512mb (from 2mb to 32mb).
+        cacheSizeLimit = 2*1024*1024;
+      } else if (mTotalSystemMemory > 0) {
+        cacheSizeLimit = mTotalSystemMemory / 16;
+      }
+    }
+
+    // Ensure cache size doesn't overflow on 32-bit platforms.
+    cacheSizeLimit = std::min(cacheSizeLimit, (uint64_t)SIZE_MAX);
+
+  #ifdef DEBUG
+    printf_stderr("Determined SkiaGL cache limits: Size %" PRIu64 ", Items: %i\n", cacheSizeLimit, cacheItemLimit);
+  #endif
+
+    mSkiaGlue->GetGrContext()->setResourceCacheLimits(cacheItemLimit, (size_t)cacheSizeLimit);
+#endif
+  }
+}
+
+SkiaGLGlue*
+gfxPlatform::GetSkiaGLGlue()
+{
+#ifdef USE_SKIA_GPU
+  // Check the accelerated Canvas is enabled for the first time,
+  // because the callers should check it before using.
+  if (!mSkiaGlue && !AllowOpenGLCanvas()) {
+    return nullptr;
+  }
+
+  if (!mSkiaGlue) {
+    /* Dummy context. We always draw into a FBO.
+     *
+     * FIXME: This should be stored in TLS or something, since there needs to be one for each thread using it. As it
+     * stands, this only works on the main thread.
+     */
+    RefPtr<GLContext> glContext;
+    nsCString discardFailureId;
+    glContext = GLContextProvider::CreateHeadless(CreateContextFlags::REQUIRE_COMPAT_PROFILE |
+                                                  CreateContextFlags::ALLOW_OFFLINE_RENDERER,
+                                                  &discardFailureId);
+    if (!glContext) {
+      printf_stderr("Failed to create GLContext for SkiaGL!\n");
+      return nullptr;
+    }
+    mSkiaGlue = new SkiaGLGlue(glContext);
+    MOZ_ASSERT(mSkiaGlue->GetGrContext(), "No GrContext");
+    InitializeSkiaCacheLimits();
+  }
+#endif
+
+  return mSkiaGlue;
+}
+
+void
+gfxPlatform::PurgeSkiaFontCache()
+{
+#ifdef USE_SKIA
+  if (gfxPlatform::GetPlatform()->GetDefaultContentBackend() == BackendType::SKIA) {
+    SkGraphics::PurgeFontCache();
+  }
+#endif
+}
+
+void
+gfxPlatform::PurgeSkiaGPUCache()
+{
+#ifdef USE_SKIA_GPU
+  if (!mSkiaGlue)
+      return;
+
+  mSkiaGlue->GetGrContext()->freeGpuResources();
+  // GrContext::flush() doesn't call glFlush. Call it here.
+  mSkiaGlue->GetGLContext()->MakeCurrent();
+  mSkiaGlue->GetGLContext()->fFlush();
+#endif
+}
+
+bool
+gfxPlatform::HasEnoughTotalSystemMemoryForSkiaGL()
+{
+  return true;
+}
+
+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);
+  } else {
+    return Factory::CreateDrawTarget(aBackend, aSize, aFormat);
+  }
+}
+
+already_AddRefed<DrawTarget>
+gfxPlatform::CreateOffscreenCanvasDrawTarget(const IntSize& aSize, SurfaceFormat aFormat)
+{
+  NS_ASSERTION(mPreferredCanvasBackend != BackendType::NONE, "No backend.");
+  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)
+{
+  NS_ASSERTION(mPreferredCanvasBackend != BackendType::NONE, "No backend.");
+  return CreateDrawTargetForBackend(mContentBackend, aSize, aFormat);
+}
+
+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 {
+    dt = Factory::CreateDrawTarget(BackendType::SKIA, aSize, aFormat);
+  }
+
+  return dt.forget();
+}
+
+/* static */ already_AddRefed<DrawTarget>
+gfxPlatform::CreateDrawTargetForData(unsigned char* aData, const IntSize& aSize, int32_t aStride, SurfaceFormat aFormat)
+{
+  BackendType backendType = gfxVars::ContentBackend();
+  NS_ASSERTION(backendType != BackendType::NONE, "No backend.");
+
+  if (!Factory::DoesBackendSupportDataDrawtarget(backendType)) {
+    backendType = BackendType::CAIRO;
+  }
+
+  RefPtr<DrawTarget> dt = Factory::CreateDrawTargetForData(backendType,
+                                                           aData, aSize,
+                                                           aStride, aFormat);
+
+  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(nsIAtom *aLangGroup,
+                         const nsACString& aGenericFamily,
+                         nsTArray<nsString>& aListOfFonts)
+{
+    gfxPlatformFontList::PlatformFontList()->GetFontList(aLangGroup,
+                                                         aGenericFamily,
+                                                         aListOfFonts);
+    return NS_OK;
+}
+
+nsresult
+gfxPlatform::UpdateFontList()
+{
+    gfxPlatformFontList::PlatformFontList()->UpdateFontList();
+    return NS_OK;
+}
+
+nsresult
+gfxPlatform::GetStandardFamilyName(const nsAString& aFontName,
+                                   nsAString& aFamilyName)
+{
+    gfxPlatformFontList::PlatformFontList()->GetStandardFamilyName(aFontName,
+                                                                   aFamilyName);
+    return NS_OK;
+}
+
+bool
+gfxPlatform::DownloadableFontsEnabled()
+{
+    if (mAllowDownloadableFonts == UNINITIALIZED_VALUE) {
+        mAllowDownloadableFonts =
+            Preferences::GetBool(GFX_DOWNLOADABLE_FONTS_ENABLED, false);
+    }
+
+    return mAllowDownloadableFonts;
+}
+
+bool
+gfxPlatform::UseCmapsDuringSystemFallback()
+{
+    if (mFallbackUsesCmaps == UNINITIALIZED_VALUE) {
+        mFallbackUsesCmaps =
+            Preferences::GetBool(GFX_PREF_FALLBACK_USE_CMAPS, false);
+    }
+
+    return mFallbackUsesCmaps;
+}
+
+bool
+gfxPlatform::OpenTypeSVGEnabled()
+{
+    if (mOpenTypeSVGEnabled == UNINITIALIZED_VALUE) {
+        mOpenTypeSVGEnabled =
+            Preferences::GetBool(GFX_PREF_OPENTYPE_SVG, false);
+    }
+
+    return mOpenTypeSVGEnabled > 0;
+}
+
+uint32_t
+gfxPlatform::WordCacheCharLimit()
+{
+    if (mWordCacheCharLimit == UNINITIALIZED_VALUE) {
+        mWordCacheCharLimit =
+            Preferences::GetInt(GFX_PREF_WORD_CACHE_CHARLIMIT, 32);
+        if (mWordCacheCharLimit < 0) {
+            mWordCacheCharLimit = 32;
+        }
+    }
+
+    return uint32_t(mWordCacheCharLimit);
+}
+
+uint32_t
+gfxPlatform::WordCacheMaxEntries()
+{
+    if (mWordCacheMaxEntries == UNINITIALIZED_VALUE) {
+        mWordCacheMaxEntries =
+            Preferences::GetInt(GFX_PREF_WORD_CACHE_MAXENTRIES, 10000);
+        if (mWordCacheMaxEntries < 0) {
+            mWordCacheMaxEntries = 10000;
+        }
+    }
+
+    return uint32_t(mWordCacheMaxEntries);
+}
+
+bool
+gfxPlatform::UseGraphiteShaping()
+{
+    if (mGraphiteShapingEnabled == UNINITIALIZED_VALUE) {
+        mGraphiteShapingEnabled =
+            Preferences::GetBool(GFX_PREF_GRAPHITE_SHAPING, false);
+    }
+
+    return mGraphiteShapingEnabled;
+}
+
+gfxFontEntry*
+gfxPlatform::LookupLocalFont(const nsAString& aFontName,
+                             uint16_t aWeight,
+                             int16_t aStretch,
+                             uint8_t aStyle)
+{
+    return gfxPlatformFontList::PlatformFontList()->LookupLocalFont(aFontName,
+                                                                    aWeight,
+                                                                    aStretch,
+                                                                    aStyle);
+}
+
+gfxFontEntry*
+gfxPlatform::MakePlatformFont(const nsAString& aFontName,
+                              uint16_t aWeight,
+                              int16_t aStretch,
+                              uint8_t aStyle,
+                              const uint8_t* aFontData,
+                              uint32_t aLength)
+{
+    return gfxPlatformFontList::PlatformFontList()->MakePlatformFont(aFontName,
+                                                                     aWeight,
+                                                                     aStretch,
+                                                                     aStyle,
+                                                                     aFontData,
+                                                                     aLength);
+}
+
+mozilla::layers::DiagnosticTypes
+gfxPlatform::GetLayerDiagnosticTypes()
+{
+  mozilla::layers::DiagnosticTypes type = DiagnosticTypes::NO_DIAGNOSTIC;
+  if (gfxPrefs::DrawLayerBorders()) {
+    type |= mozilla::layers::DiagnosticTypes::LAYER_BORDERS;
+  }
+  if (gfxPrefs::DrawTileBorders()) {
+    type |= mozilla::layers::DiagnosticTypes::TILE_BORDERS;
+  }
+  if (gfxPrefs::DrawBigImageBorders()) {
+    type |= mozilla::layers::DiagnosticTypes::BIGIMAGE_BORDERS;
+  }
+  if (gfxPrefs::FlashLayerBorders()) {
+    type |= mozilla::layers::DiagnosticTypes::FLASH_BORDERS;
+  }
+  return type;
+}
+
+void
+gfxPlatform::InitBackendPrefs(uint32_t aCanvasBitmask, BackendType aCanvasDefault,
+                              uint32_t aContentBitmask, BackendType aContentDefault)
+{
+    mPreferredCanvasBackend = GetCanvasBackendPref(aCanvasBitmask);
+    if (mPreferredCanvasBackend == BackendType::NONE) {
+        mPreferredCanvasBackend = aCanvasDefault;
+    }
+
+    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(aCanvasBitmask &
+                               ~(BackendTypeBit(mPreferredCanvasBackend) | BackendTypeBit(BackendType::DIRECT2D)));
+    } else {
+      mFallbackCanvasBackend =
+          GetCanvasBackendPref(aCanvasBitmask & ~BackendTypeBit(mPreferredCanvasBackend));
+    }
+
+    mContentBackendBitmask = aContentBitmask;
+    mContentBackend = GetContentBackendPref(mContentBackendBitmask);
+    if (mContentBackend == BackendType::NONE) {
+        mContentBackend = aContentDefault;
+        // 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(aContentDefault);
+    }
+
+    if (XRE_IsParentProcess()) {
+        gfxVars::SetContentBackend(mContentBackend);
+    }
+}
+
+/* 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;
+    nsCString 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();
+}
+
+eCMSMode
+gfxPlatform::GetCMSMode()
+{
+    if (!gCMSInitialized) {
+        int32_t mode = gfxPrefs::CMSMode();
+        if (mode >= 0 && mode < eCMSMode_AllCount) {
+            gCMSMode = static_cast<eCMSMode>(mode);
+        }
+
+        bool enableV4 = gfxPrefs::CMSEnableV4();
+        if (enableV4) {
+            qcms_enable_iccv4();
+        }
+        gCMSInitialized = true;
+    }
+    return gCMSMode;
+}
+
+int
+gfxPlatform::GetRenderingIntent()
+{
+  // gfxPrefs.h 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 = gfxPrefs::CMSRenderingIntent();
+  if ((pIntent < QCMS_INTENT_MIN) || (pIntent > QCMS_INTENT_MAX)) {
+    /* If the pref is out of range, use embedded profile. */
+    pIntent = -1;
+  }
+  return pIntent;
+}
+
+void
+gfxPlatform::TransformPixel(const Color& in, Color& out, 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);
+        out = Color::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);
+        out = Color::UnusualFromARGB(packed);
+#endif
+    }
+
+    else if (&out != &in)
+        out = in;
+}
+
+void
+gfxPlatform::GetPlatformCMSOutputProfile(void *&mem, size_t &size)
+{
+    mem = nullptr;
+    size = 0;
+}
+
+void
+gfxPlatform::GetCMSOutputProfileData(void *&mem, size_t &size)
+{
+    nsAdoptingCString fname = Preferences::GetCString("gfx.color_management.display_profile");
+    if (!fname.IsEmpty()) {
+        qcms_data_from_path(fname, &mem, &size);
+    }
+    else {
+        gfxPlatform::GetPlatform()->GetPlatformCMSOutputProfile(mem, size);
+    }
+}
+
+void
+gfxPlatform::CreateCMSOutputProfile()
+{
+    if (!gCMSOutputProfile) {
+        /* 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 (Preferences::GetBool(GFX_PREF_CMS_FORCE_SRGB, false)) {
+            gCMSOutputProfile = GetCMSsRGBProfile();
+        }
+
+        if (!gCMSOutputProfile) {
+            void* mem = nullptr;
+            size_t size = 0;
+
+            GetCMSOutputProfileData(mem, size);
+            if ((mem != nullptr) && (size > 0)) {
+                gCMSOutputProfile = qcms_profile_from_memory(mem, size);
+                free(mem);
+            }
+        }
+
+        /* 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 != GetCMSsRGBProfile(),
+                         "Builtin sRGB profile tagged as bogus!!!");
+            qcms_profile_release(gCMSOutputProfile);
+            gCMSOutputProfile = nullptr;
+        }
+
+        if (!gCMSOutputProfile) {
+            gCMSOutputProfile = GetCMSsRGBProfile();
+        }
+        /* Precache the LUT16 Interpolations for the output profile. See
+           bug 444661 for details. */
+        qcms_profile_precache_output_transform(gCMSOutputProfile);
+    }
+}
+
+qcms_profile *
+gfxPlatform::GetCMSOutputProfile()
+{
+    return gCMSOutputProfile;
+}
+
+qcms_profile *
+gfxPlatform::GetCMSsRGBProfile()
+{
+    if (!gCMSsRGBProfile) {
+
+        /* Create the profile using qcms. */
+        gCMSsRGBProfile = qcms_profile_sRGB();
+    }
+    return gCMSsRGBProfile;
+}
+
+qcms_transform *
+gfxPlatform::GetCMSRGBTransform()
+{
+    if (!gCMSRGBTransform) {
+        qcms_profile *inProfile, *outProfile;
+        outProfile = GetCMSOutputProfile();
+        inProfile = GetCMSsRGBProfile();
+
+        if (!inProfile || !outProfile)
+            return nullptr;
+
+        gCMSRGBTransform = qcms_transform_create(inProfile, QCMS_DATA_RGB_8,
+                                              outProfile, QCMS_DATA_RGB_8,
+                                             QCMS_INTENT_PERCEPTUAL);
+    }
+
+    return gCMSRGBTransform;
+}
+
+qcms_transform *
+gfxPlatform::GetCMSInverseRGBTransform()
+{
+    if (!gCMSInverseRGBTransform) {
+        qcms_profile *inProfile, *outProfile;
+        inProfile = GetCMSOutputProfile();
+        outProfile = GetCMSsRGBProfile();
+
+        if (!inProfile || !outProfile)
+            return nullptr;
+
+        gCMSInverseRGBTransform = qcms_transform_create(inProfile, QCMS_DATA_RGB_8,
+                                                     outProfile, QCMS_DATA_RGB_8,
+                                                     QCMS_INTENT_PERCEPTUAL);
+    }
+
+    return gCMSInverseRGBTransform;
+}
+
+qcms_transform *
+gfxPlatform::GetCMSRGBATransform()
+{
+    if (!gCMSRGBATransform) {
+        qcms_profile *inProfile, *outProfile;
+        outProfile = GetCMSOutputProfile();
+        inProfile = GetCMSsRGBProfile();
+
+        if (!inProfile || !outProfile)
+            return nullptr;
+
+        gCMSRGBATransform = qcms_transform_create(inProfile, QCMS_DATA_RGBA_8,
+                                               outProfile, QCMS_DATA_RGBA_8,
+                                               QCMS_INTENT_PERCEPTUAL);
+    }
+
+    return gCMSRGBATransform;
+}
+
+/* Shuts down various transforms and profiles for CMS. */
+static void 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 (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 = eCMSMode_Off;
+    gCMSInitialized = false;
+}
+
+// default SetupClusterBoundaries, based on Unicode properties;
+// platform subclasses may override if they wish
+void
+gfxPlatform::SetupClusterBoundaries(gfxTextRun *aTextRun, const char16_t *aString)
+{
+    if (aTextRun->GetFlags() & gfxTextRunFactory::TEXT_IS_8BIT) {
+        // 8-bit text doesn't have clusters.
+        // XXX is this true in all languages???
+        // behdad: don't think so.  Czech for example IIRC has a
+        // 'ch' grapheme.
+        // jfkthame: but that's not expected to behave as a grapheme cluster
+        // for selection/editing/etc.
+        return;
+    }
+
+    aTextRun->SetupClusterBoundaries(0, aString, aTextRun->GetLength());
+}
+
+int32_t
+gfxPlatform::GetBidiNumeralOption()
+{
+    if (mBidiNumeralOption == UNINITIALIZED_VALUE) {
+        mBidiNumeralOption = Preferences::GetInt(BIDI_NUMERAL_PREF, 0);
+    }
+    return mBidiNumeralOption;
+}
+
+/* static */ void
+gfxPlatform::FlushFontAndWordCaches()
+{
+    gfxFontCache *fontCache = gfxFontCache::GetCache();
+    if (fontCache) {
+        fontCache->AgeAllGenerations();
+        fontCache->FlushShapedWordCaches();
+    }
+
+    gfxPlatform::PurgeSkiaFontCache();
+}
+
+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_FALLBACK_USE_CMAPS, aPref)) {
+        mFallbackUsesCmaps = UNINITIALIZED_VALUE;
+    } else if (!strcmp(GFX_PREF_WORD_CACHE_CHARLIMIT, aPref)) {
+        mWordCacheCharLimit = UNINITIALIZED_VALUE;
+        FlushFontAndWordCaches();
+    } else if (!strcmp(GFX_PREF_WORD_CACHE_MAXENTRIES, aPref)) {
+        mWordCacheMaxEntries = UNINITIALIZED_VALUE;
+        FlushFontAndWordCaches();
+    } else if (!strcmp(GFX_PREF_GRAPHITE_SHAPING, aPref)) {
+        mGraphiteShapingEnabled = UNINITIALIZED_VALUE;
+        FlushFontAndWordCaches();
+    } else if (!strcmp(BIDI_NUMERAL_PREF, aPref)) {
+        mBidiNumeralOption = UNINITIALIZED_VALUE;
+    } else if (!strcmp(GFX_PREF_OPENTYPE_SVG, aPref)) {
+        mOpenTypeSVGEnabled = UNINITIALIZED_VALUE;
+        gfxFontCache::GetCache()->AgeAllGenerations();
+    }
+}
+
+
+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;
+}
+
+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:
+      NS_NOTREACHED("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:
+    NS_NOTREACHED("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:
+    NS_NOTREACHED("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 bool sBufferRotationCheckPref = true;
+
+static mozilla::Atomic<bool> sLayersAccelerationPrefsInitialized(false);
+
+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::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");
+
+  gfxPrefs::GetSingleton();
+
+  if (XRE_IsParentProcess()) {
+    gfxVars::SetBrowserTabsRemoteAutostart(BrowserTabsRemoteAutostart());
+    gfxVars::SetOffscreenFormat(GetOffscreenFormat());
+    gfxVars::SetRequiresAcceleratedGLContextForCompositorOGL(
+              RequiresAcceleratedGLContextForCompositorOGL());
+  }
+
+  nsCOMPtr<nsIGfxInfo> gfxInfo = services::GetGfxInfo();
+  nsCString discardFailureId;
+  int32_t status;
+
+  if (Preferences::GetBool("media.hardware-video-decoding.enabled", false) &&
+#ifdef XP_WIN
+    Preferences::GetBool("media.windows-media-foundation.use-dxva", true) &&
+#endif
+      NS_SUCCEEDED(gfxInfo->GetFeatureStatus(nsIGfxInfo::FEATURE_HARDWARE_VIDEO_DECODING,
+                                               discardFailureId, &status))) {
+      if (status == nsIGfxInfo::FEATURE_STATUS_OK || gfxPrefs::HardwareVideoDecodingForceEnabled()) {
+         sLayersSupportsHardwareVideoDecoding = true;
+    }
+  }
+
+  sLayersAccelerationPrefsInitialized = true;
+
+  if (XRE_IsParentProcess()) {
+    Preferences::RegisterCallbackAndCall(VideoDecodingFailedChangedCallback,
+                                         "media.hardware-video-decoding.failed",
+                                         nullptr,
+                                         Preferences::ExactMatch);
+    InitGPUProcessPrefs();
+  }
+}
+
+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 (!gfxPrefs::GPUProcessDevEnabled() && !gfxPrefs::GPUProcessDevForceEnabled()) {
+    return;
+  }
+
+  FeatureState& gpuProc = gfxConfig::GetFeature(Feature::GPU_PROCESS);
+
+  gpuProc.SetDefaultFromPref(
+    gfxPrefs::GetGPUProcessDevEnabledPrefName(),
+    true,
+    gfxPrefs::GetGPUProcessDevEnabledPrefDefault());
+
+  if (gfxPrefs::GPUProcessDevForceEnabled()) {
+    gpuProc.UserForceEnable("User force-enabled via pref");
+  }
+
+  // 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.ForceDisable(
+      FeatureStatus::Unavailable,
+      "Multi-process mode is not enabled",
+      NS_LITERAL_CSTRING("FEATURE_FAILURE_NO_E10S"));
+    return;
+  }
+  if (InSafeMode()) {
+    gpuProc.ForceDisable(
+      FeatureStatus::Blocked,
+      "Safe-mode is enabled",
+      NS_LITERAL_CSTRING("FEATURE_FAILURE_SAFE_MODE"));
+    return;
+  }
+  if (gfxPrefs::LayerScopeEnabled()) {
+    gpuProc.ForceDisable(
+      FeatureStatus::Blocked,
+      "LayerScope does not work in the GPU process",
+      NS_LITERAL_CSTRING("FEATURE_FAILURE_LAYERSCOPE"));
+    return;
+  }
+}
+
+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 (gfxPrefs::LayersAccelerationDisabledDoNotUseDirectly()) {
+      feature.UserDisable("Disabled by pref",
+                          NS_LITERAL_CSTRING("FEATURE_FAILURE_COMP_PREF"));
+    } else if (acceleratedEnv && *acceleratedEnv == '0') {
+      feature.UserDisable("Disabled by envvar",
+                          NS_LITERAL_CSTRING("FEATURE_FAILURE_COMP_ENV"));
+    }
+  } else {
+    if (acceleratedEnv && *acceleratedEnv == '1') {
+      feature.UserEnable("Enabled by envvar");
+    }
+  }
+
+  // This has specific meaning elsewhere, so we always record it.
+  if (gfxPrefs::LayersAccelerationForceEnabledDoNotUseDirectly()) {
+    feature.UserForceEnable("Force-enabled by pref");
+  }
+
+  // Safe mode trumps everything.
+  if (InSafeMode()) {
+    feature.ForceDisable(FeatureStatus::Blocked, "Acceleration blocked by safe-mode",
+                         NS_LITERAL_CSTRING("FEATURE_FAILURE_COMP_SAFEMODE"));
+  }
+}
+
+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
+}
+
+bool
+gfxPlatform::BufferRotationEnabled()
+{
+  MutexAutoLock autoLock(*gGfxPlatformPrefsLock);
+
+  return sBufferRotationCheckPref && gfxPrefs::BufferRotationEnabled();
+}
+
+void
+gfxPlatform::DisableBufferRotation()
+{
+  MutexAutoLock autoLock(*gGfxPlatformPrefsLock);
+
+  sBufferRotationCheckPref = false;
+}
+
+already_AddRefed<ScaledFont>
+gfxPlatform::GetScaledFontForFontWithCairoSkia(DrawTarget* aTarget, gfxFont* aFont)
+{
+    NativeFont nativeFont;
+    if (aTarget->GetBackendType() == BackendType::CAIRO || aTarget->GetBackendType() == BackendType::SKIA) {
+        nativeFont.mType = NativeFontType::CAIRO_FONT_FACE;
+        nativeFont.mFont = aFont->GetCairoScaledFont();
+        return Factory::CreateScaledFontForNativeFont(nativeFont, aFont->GetAdjustedSize());
+    }
+
+    return nullptr;
+}
+
+/* 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() ||
+      !gfxPrefs::LayersOffMainThreadCompositionForceDisabled();
+#if defined(MOZ_WIDGET_GTK)
+    // Linux users who chose OpenGL are being grandfathered in to OMTC
+    result |= gfxPrefs::LayersAccelerationForceEnabledDoNotUseDirectly();
+
+#endif
+    firstTime = false;
+  }
+
+  return result;
+}
+
+/***
+ * 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::CreateHardwareVsyncSource()
+{
+  RefPtr<mozilla::gfx::VsyncSource> softwareVsync = new SoftwareVsyncSource();
+  return softwareVsync.forget();
+}
+
+/* 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.
+  return gfxPrefs::LayoutFrameRate() == 0;
+}
+
+/* static */ bool
+gfxPlatform::ForceSoftwareVsync()
+{
+  return gfxPrefs::LayoutFrameRate() > 0;
+}
+
+/* static */ int
+gfxPlatform::GetSoftwareVsyncRate()
+{
+  int preferenceRate = gfxPrefs::LayoutFrameRate();
+  if (preferenceRate <= 0) {
+    return gfxPlatform::GetDefaultFrameRate();
+  }
+  return preferenceRate;
+}
+
+/* static */ int
+gfxPlatform::GetDefaultFrameRate()
+{
+  return 60;
+}
+
+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);
+  }
+}
+
+void
+gfxPlatform::GetTilesSupportInfo(mozilla::widget::InfoObject& aObj)
+{
+  if (!gfxPrefs::LayersTilesEnabled()) {
+    return;
+  }
+
+  IntSize tileSize = gfxVars::TileSize();
+  aObj.DefineProperty("TileHeight", tileSize.height);
+  aObj.DefineProperty("TileWidth", tileSize.width);
+}
+
+/*static*/ bool
+gfxPlatform::AsyncPanZoomEnabled()
+{
+#if !defined(MOZ_B2G) && !defined(MOZ_WIDGET_ANDROID) && !defined(MOZ_WIDGET_UIKIT)
+  // For XUL applications (everything but B2G on mobile and desktop, and
+  // 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
+  return gfxPrefs::AsyncPanZoomEnabledDoNotUseDirectly();
+#endif
+}
+
+/*static*/ bool
+gfxPlatform::PerfWarnings()
+{
+  return gfxPrefs::PerfWarnings();
+}
+
+void
+gfxPlatform::GetAcceleratedCompositorBackends(nsTArray<LayersBackend>& aBackends)
+{
+  if (gfxConfig::IsEnabled(Feature::OPENGL_COMPOSITING)) {
+    aBackends.AppendElement(LayersBackend::LAYERS_OPENGL);
+  }
+  else {
+    static int tell_me_once = 0;
+    if (!tell_me_once) {
+      NS_WARNING("OpenGL-accelerated layers are not supported on this system");
+      tell_me_once = 1;
+    }
+#ifdef MOZ_WIDGET_ANDROID
+    NS_RUNTIMEABORT("OpenGL-accelerated layers are a hard requirement on this platform. "
+                    "Cannot continue without support for them");
+#endif
+  }
+}
+
+void
+gfxPlatform::GetCompositorBackends(bool useAcceleration, nsTArray<mozilla::layers::LayersBackend>& aBackends)
+{
+  if (useAcceleration) {
+    GetAcceleratedCompositorBackends(aBackends);
+  }
+  aBackends.AppendElement(LayersBackend::LAYERS_BASIC);
+}
+
+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;
+
+  // Notify that we created a compositor, so telemetry can update.
+  NS_DispatchToMainThread(NS_NewRunnableFunction([] {
+    if (nsCOMPtr<nsIObserverService> obsvc = services::GetObserverService()) {
+      obsvc->NotifyObservers(nullptr, "compositor:created", nullptr);
+    }
+  }));
+}
+
+void
+gfxPlatform::FetchAndImportContentDeviceData()
+{
+  MOZ_ASSERT(XRE_IsContentProcess());
+
+  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.
+  GPUProcessManager::Get()->EnsureGPUReady();
+
+  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::SupportsApzDragInput() const
+{
+  return gfxPrefs::APZDragEnabled();
+}
+
+void
+gfxPlatform::BumpDeviceCounter()
+{
+  mDeviceCounter++;
+}
+
+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",
+                           NS_LITERAL_CSTRING("FEATURE_FAILURE_OPENGL_NEED_HWCOMP"));
+    return;
+  }
+
+  #ifdef XP_WIN
+  openGLFeature.SetDefaultFromPref(
+    gfxPrefs::GetLayersPreferOpenGLPrefName(),
+    true,
+    gfxPrefs::GetLayersPreferOpenGLPrefDefault());
+  #else
+    openGLFeature.EnableByDefault();
+  #endif
+
+  // When layers acceleration is force-enabled, enable it even for blacklisted
+  // devices.
+  if (gfxPrefs::LayersAccelerationForceEnabledDoNotUseDirectly()) {
+    openGLFeature.UserForceEnable("Force-enabled by pref");
+    return;
+  }
+
+  nsCString message;
+  nsCString failureId;
+  if (!IsGfxInfoStatusOkay(nsIGfxInfo::FEATURE_OPENGL_LAYERS, &message, failureId)) {
+    openGLFeature.Disable(FeatureStatus::Blacklisted, message.get(), failureId);
+  }
+}
+
+bool
+gfxPlatform::IsGfxInfoStatusOkay(int32_t aFeature, nsCString* aOutMessage, nsCString& aFailureId)
+{
+  nsCOMPtr<nsIGfxInfo> gfxInfo = services::GetGfxInfo();
+  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;
+}