Bug 1794722 - Part 2. Remove all uses of gfxVars::UseWebRender(). r=jrmuizel,media-playback-reviewers,alwu

This is always true.

Differential Revision: https://phabricator.services.mozilla.com/D160121

dom/media/platforms/agnostic/DAV1DDecoder.cpp

@@ -10,7 +10,6 @@
 #include "ImageContainer.h"
 #include "mozilla/StaticPrefs_media.h"
 #include "mozilla/TaskQueue.h"
-#include "mozilla/gfx/gfxVars.h"
 #include "nsThreadUtils.h"
 #include "VideoUtils.h"
 
@@ -210,13 +209,6 @@ int DAV1DDecoder::GetPicture(DecodedData& aData, MediaResult& aResult) {
     return 0;
   }
 
-#ifdef ANDROID
-  if (!gfxVars::UseWebRender() && (*picture).p.bpc != 8) {
-    aResult = MediaResult(NS_ERROR_DOM_MEDIA_NOT_SUPPORTED_ERR, __func__);
-    return -1;
-  }
-#endif
-
   RefPtr<VideoData> v = ConstructImage(*picture);
   if (!v) {
     LOG("Image allocation error: %ux%u"

gfx/config/gfxVars.h

@@ -38,7 +38,6 @@ class gfxVarReceiver;
   _(DXNV12Blocked, bool, false)                                    \
   _(DXP010Blocked, bool, false)                                    \
   _(DXP016Blocked, bool, false)                                    \
-  _(UseWebRender, bool, false)                                     \
   _(UseWebRenderANGLE, bool, false)                                \
   _(UseWebRenderFlipSequentialWin, bool, false)                    \
   _(UseWebRenderDCompWin, bool, false)                             \

gfx/ipc/GPUParent.cpp

@@ -273,9 +273,7 @@ mozilla::ipc::IPCResult GPUParent::RecvInit(
     // processes this happens in gfxPlatform::InitWebRenderConfig.
     ScopedGfxFeatureReporter reporter("WR",
                                       gfxPlatform::WebRenderPrefEnabled());
-    if (gfxVars::UseWebRender()) {
-      reporter.SetSuccessful();
-    }
+    reporter.SetSuccessful();
   }
 
   for (const LayerTreeIdMapping& map : aMappings) {
@@ -299,14 +297,12 @@ mozilla::ipc::IPCResult GPUParent::RecvInit(
       }
     }
   }
-  if (gfxVars::UseWebRender()) {
-    DeviceManagerDx::Get()->CreateDirectCompositionDevice();
-    // Ensure to initialize GfxInfo
-    nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
-    Unused << gfxInfo;
+  DeviceManagerDx::Get()->CreateDirectCompositionDevice();
+  // Ensure to initialize GfxInfo
+  nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
+  Unused << gfxInfo;
 
-    Factory::EnsureDWriteFactory();
-  }
+  Factory::EnsureDWriteFactory();
 #endif
 
 #if defined(MOZ_WIDGET_GTK)
@@ -335,15 +331,13 @@ mozilla::ipc::IPCResult GPUParent::RecvInit(
   // Ensure we have an FT library for font instantiation.
   // This would normally be set by gfxPlatform::Init().
   // Since we bypass that, we must do it here instead.
-  if (gfxVars::UseWebRender()) {
-    FT_Library library = Factory::NewFTLibrary();
-    MOZ_ASSERT(library);
-    Factory::SetFTLibrary(library);
+  FT_Library library = Factory::NewFTLibrary();
+  MOZ_ASSERT(library);
+  Factory::SetFTLibrary(library);
 
-    // true to match gfxPlatform::FontHintingEnabled(). We must hardcode
-    // this value because we do not have a gfxPlatform instance.
-    SkInitCairoFT(true);
-  }
+  // true to match gfxPlatform::FontHintingEnabled(). We must hardcode
+  // this value because we do not have a gfxPlatform instance.
+  SkInitCairoFT(true);
 
   // Ensure that GfxInfo::Init is called on the main thread.
   nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
@@ -371,22 +365,11 @@ mozilla::ipc::IPCResult GPUParent::RecvInit(
 #endif
 
   // Make sure to do this *after* we update gfxVars above.
-  if (gfxVars::UseWebRender()) {
-    if (gfxVars::UseCanvasRenderThread()) {
-      gfx::CanvasRenderThread::Start();
-    }
-    wr::RenderThread::Start(aWrNamespace);
-    image::ImageMemoryReporter::InitForWebRender();
+  if (gfxVars::UseCanvasRenderThread()) {
+    gfx::CanvasRenderThread::Start();
   }
-#ifdef XP_WIN
-  else {
-    if (gfxVars::UseDoubleBufferingWithCompositor()) {
-      // This is needed to avoid freezing the window on a device crash on double
-      // buffering, see bug 1549674.
-      widget::WinCompositorWindowThread::Start();
-    }
-  }
-#endif
+  wr::RenderThread::Start(aWrNamespace);
+  image::ImageMemoryReporter::InitForWebRender();
 
   VRManager::ManagerInit();
   // Send a message to the UI process that we're done.

gfx/ipc/GPUProcessManager.cpp

@@ -586,10 +586,6 @@ bool GPUProcessManager::FallbackFromAcceleration(wr::WebRenderError aError,
 
 bool GPUProcessManager::DisableWebRenderConfig(wr::WebRenderError aError,
                                                const nsCString& aMsg) {
-  if (!gfx::gfxVars::UseWebRender()) {
-    return false;
-  }
-
   // If we have a stable compositor process, this may just be due to an OOM or
   // bad driver state. In that case, we should consider restarting the GPU
   // process, or simulating a device reset to teardown the compositors to
@@ -658,13 +654,6 @@ void GPUProcessManager::NotifyWebRenderError(wr::WebRenderError aError) {
 }
 
 bool GPUProcessManager::OnDeviceReset(bool aTrackThreshold) {
-#ifdef XP_WIN
-  // Disable double buffering when device reset happens.
-  if (!gfxVars::UseWebRender() && gfxVars::UseDoubleBufferingWithCompositor()) {
-    gfxVars::SetUseDoubleBufferingWithCompositor(false);
-  }
-#endif
-
   // Ignore resets for thresholding if requested.
   if (!aTrackThreshold) {
     return false;

gfx/layers/D3D11YCbCrImage.cpp

@@ -379,13 +379,7 @@ already_AddRefed<TextureClient> DXGIYCbCrTextureAllocationHelper::Allocate(
                                     ? DXGI_FORMAT_R8_UNORM
                                     : DXGI_FORMAT_R16_UNORM,
                                 ySize.width, ySize.height, 1, 1);
-  // WebRender requests keyed mutex
-  if (mDevice == gfx::DeviceManagerDx::Get()->GetCompositorDevice() &&
-      !gfxVars::UseWebRender()) {
-    newDesc.MiscFlags = D3D11_RESOURCE_MISC_SHARED;
-  } else {
-    newDesc.MiscFlags = D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX;
-  }
+  newDesc.MiscFlags = D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX;
 
   RefPtr<ID3D10Multithread> mt;
   HRESULT hr = mDevice->QueryInterface((ID3D10Multithread**)getter_AddRefs(mt));

gfx/layers/LayersTypes.cpp

@@ -31,7 +31,6 @@ const char* GetLayersBackendName(LayersBackend aBackend) {
     case LayersBackend::LAYERS_NONE:
       return "none";
     case LayersBackend::LAYERS_WR:
-      MOZ_ASSERT(gfx::gfxVars::UseWebRender());
       if (gfx::gfxVars::UseSoftwareWebRender()) {
 #ifdef XP_WIN
         if (gfx::gfxVars::AllowSoftwareWebRenderD3D11() &&

gfx/layers/apz/test/gtest/APZTestCommon.h

@@ -16,7 +16,6 @@
 #include "gmock/gmock.h"
 
 #include "mozilla/Attributes.h"
-#include "mozilla/gfx/gfxVars.h"
 #include "mozilla/layers/GeckoContentController.h"
 #include "mozilla/layers/CompositorBridgeParent.h"
 #include "mozilla/layers/APZThreadUtils.h"

gfx/layers/apz/test/gtest/TestOverscroll.cpp

@@ -68,10 +68,6 @@ class APZCOverscrollTester : public APZCBasicTester {
 
   ScrollableLayerGuid CreateSimpleRootScrollableForWebRender() {
     ScrollableLayerGuid guid;
-    if (!gfx::gfxVars::UseWebRender()) {
-      return guid;
-    }
-
     guid.mScrollId = ScrollableLayerGuid::START_SCROLL_ID;
     guid.mLayersId = LayersId{0};
 
@@ -1349,11 +1345,6 @@ TEST_F(
 
 #ifndef MOZ_WIDGET_ANDROID  // Currently fails on Android
 TEST_F(APZCOverscrollTester, OverscrollByPanGesturesInterruptedByReflowZoom) {
-  if (!gfx::gfxVars::UseWebRender()) {
-    // This test is only available with WebRender.
-    return;
-  }
-
   SCOPED_GFX_PREF_BOOL("apz.overscroll.enabled", true);
   SCOPED_GFX_PREF_INT("mousewheel.with_control.action", 3);  // reflow zoom.
 

gfx/layers/client/TextureRecorded.cpp

@@ -6,7 +6,6 @@
 
 #include "TextureRecorded.h"
 
-#include "mozilla/gfx/gfxVars.h"
 #include "RecordedCanvasEventImpl.h"
 
 namespace mozilla {
@@ -114,13 +113,9 @@ void RecordedTextureData::OnForwardedToHost() {
 }
 
 TextureFlags RecordedTextureData::GetTextureFlags() const {
-  TextureFlags flags = TextureFlags::NO_FLAGS;
   // With WebRender, resource open happens asynchronously on RenderThread.
   // Use WAIT_HOST_USAGE_END to keep TextureClient alive during host side usage.
-  if (gfx::gfxVars::UseWebRender()) {
-    flags |= TextureFlags::WAIT_HOST_USAGE_END;
-  }
-  return flags;
+  return TextureFlags::WAIT_HOST_USAGE_END;
 }
 
 }  // namespace layers

gfx/layers/d3d11/TextureD3D11.cpp

@@ -605,14 +605,10 @@ void D3D11TextureData::GetDXGIResource(IDXGIResource** aOutResource) {
 }
 
 TextureFlags D3D11TextureData::GetTextureFlags() const {
-  TextureFlags flags = TextureFlags::NO_FLAGS;
   // With WebRender, resource open happens asynchronously on RenderThread.
   // During opening the resource on host side, TextureClient needs to be alive.
   // With WAIT_HOST_USAGE_END, keep TextureClient alive during host side usage.
-  if (gfx::gfxVars::UseWebRender()) {
-    flags |= TextureFlags::WAIT_HOST_USAGE_END;
-  }
-  return flags;
+  return TextureFlags::WAIT_HOST_USAGE_END;
 }
 
 DXGIYCbCrTextureData* DXGIYCbCrTextureData::Create(
@@ -746,14 +742,10 @@ void DXGIYCbCrTextureData::Deallocate(LayersIPCChannel*) {
 }
 
 TextureFlags DXGIYCbCrTextureData::GetTextureFlags() const {
-  TextureFlags flags = TextureFlags::NO_FLAGS;
   // With WebRender, resource open happens asynchronously on RenderThread.
   // During opening the resource on host side, TextureClient needs to be alive.
   // With WAIT_HOST_USAGE_END, keep TextureClient alive during host side usage.
-  if (gfx::gfxVars::UseWebRender()) {
-    flags |= TextureFlags::WAIT_HOST_USAGE_END;
-  }
-  return flags;
+  return TextureFlags::WAIT_HOST_USAGE_END;
 }
 
 already_AddRefed<TextureHost> CreateTextureHostD3D11(
@@ -884,10 +876,6 @@ bool DXGITextureHostD3D11::LockInternal() {
 }
 
 already_AddRefed<gfx::DataSourceSurface> DXGITextureHostD3D11::GetAsSurface() {
-  if (!gfxVars::UseWebRender()) {
-    return nullptr;
-  }
-
   switch (GetFormat()) {
     case gfx::SurfaceFormat::R8G8B8X8:
     case gfx::SurfaceFormat::R8G8B8A8:
@@ -1772,7 +1760,7 @@ bool SyncObjectD3D11ClientContentDevice::IsSyncObjectValid() {
   }
 
   // Update mDevice if the ContentDevice initialization is detected.
-  if (!mContentDevice && dev && NS_IsMainThread() && gfxVars::UseWebRender()) {
+  if (!mContentDevice && dev && NS_IsMainThread()) {
     mContentDevice = dev;
   }
 

gfx/layers/ipc/SharedSurfacesChild.cpp

@@ -7,7 +7,6 @@
 #include "SharedSurfacesChild.h"
 #include "SharedSurfacesParent.h"
 #include "CompositorManagerChild.h"
-#include "mozilla/gfx/gfxVars.h"
 #include "mozilla/layers/IpcResourceUpdateQueue.h"
 #include "mozilla/layers/SourceSurfaceSharedData.h"
 #include "mozilla/layers/WebRenderBridgeChild.h"
@@ -171,7 +170,7 @@ nsresult SharedSurfacesChild::ShareInternal(SourceSurfaceSharedData* aSurface,
   MOZ_ASSERT(aUserData);
 
   CompositorManagerChild* manager = CompositorManagerChild::GetInstance();
-  if (NS_WARN_IF(!manager || !manager->CanSend() || !gfxVars::UseWebRender())) {
+  if (NS_WARN_IF(!manager || !manager->CanSend())) {
     // We cannot try to share the surface, most likely because the GPU process
     // crashed. Ideally, we would retry when it is ready, but the handles may be
     // a scarce resource, which can cause much more serious problems if we run

gfx/thebes/DeviceManagerDx.cpp

@@ -113,7 +113,6 @@ bool DeviceManagerDx::LoadD3D11() {
 
 bool DeviceManagerDx::LoadDcomp() {
   MOZ_ASSERT(gfxConfig::GetFeature(Feature::D3D11_COMPOSITING).IsEnabled());
-  MOZ_ASSERT(gfxVars::UseWebRender());
   MOZ_ASSERT(gfxVars::UseWebRenderANGLE());
   MOZ_ASSERT(gfxVars::UseWebRenderDCompWin());
 
@@ -317,7 +316,7 @@ bool DeviceManagerDx::CreateCompositorDevicesLocked() {
   // Fallback from WR to D3D11 Non-WR compositor without re-creating gpu process
   // could happen when WR causes error. In this case, the attachments are loaded
   // synchronously.
-  if (!gfx::gfxVars::UseWebRender() || gfx::gfxVars::UseSoftwareWebRender()) {
+  if (gfx::gfxVars::UseSoftwareWebRender()) {
     PreloadAttachmentsOnCompositorThread();
   }
 

gfx/thebes/gfxPlatform.cpp

@@ -925,20 +925,17 @@ void gfxPlatform::Init() {
   gPlatform->InitWindowOcclusionConfig();
   gPlatform->InitBackdropFilterConfig();
 
+#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 (!UseWebRender()
-#if defined(XP_WIN)
-      || (UseWebRender() && XRE_IsParentProcess() &&
-          !gfxConfig::IsEnabled(Feature::GPU_PROCESS) &&
-          StaticPrefs::
-              gfx_webrender_enabled_no_gpu_process_with_angle_win_AtStartup())
-#endif
-  ) {
+  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();
@@ -1014,7 +1011,7 @@ void gfxPlatform::Init() {
   }
 
   RegisterStrongMemoryReporter(new GfxMemoryImageReporter());
-  if (XRE_IsParentProcess() && UseWebRender()) {
+  if (XRE_IsParentProcess()) {
     RegisterStrongAsyncMemoryReporter(new WebRenderMemoryReporter());
   }
 
@@ -1188,9 +1185,6 @@ bool gfxPlatform::IsHeadless() {
   return headless;
 }
 
-/* static */
-bool gfxPlatform::UseWebRender() { return gfx::gfxVars::UseWebRender(); }
-
 /* static */
 bool gfxPlatform::UseRemoteCanvas() {
   return XRE_IsContentProcess() && gfx::gfxVars::RemoteCanvasEnabled();
@@ -1310,7 +1304,7 @@ void gfxPlatform::InitLayersIPC() {
       widget::WinWindowOcclusionTracker::Ensure();
     }
 #endif
-    if (!gfxConfig::IsEnabled(Feature::GPU_PROCESS) && UseWebRender()) {
+    if (!gfxConfig::IsEnabled(Feature::GPU_PROCESS)) {
       RemoteTextureMap::Init();
       if (gfxVars::UseCanvasRenderThread()) {
         gfx::CanvasRenderThread::Start();
@@ -2107,8 +2101,8 @@ void gfxPlatform::InitializeCMS() {
     nsTArray<uint8_t> outputProfileData =
         gfxPlatform::GetPlatform()->GetPlatformCMSOutputProfileData();
     if (!outputProfileData.IsEmpty()) {
-      gCMSOutputProfile = qcms_profile_from_memory_curves_only(outputProfileData.Elements(),
-                                                               outputProfileData.Length());
+      gCMSOutputProfile = qcms_profile_from_memory_curves_only(
+          outputProfileData.Elements(), outputProfileData.Length());
     }
   }
 
@@ -2602,9 +2596,7 @@ void gfxPlatform::InitWebRenderConfig() {
     // 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.
-    if (gfxVars::UseWebRender()) {
-      reporter.SetSuccessful();
-    }
+    reporter.SetSuccessful();
     return;
   }
 
@@ -2642,9 +2634,6 @@ void gfxPlatform::InitWebRenderConfig() {
   Preferences::RegisterPrefixCallbackAndCall(SwapIntervalPrefChangeCallback,
                                              "gfx.swap-interval");
 
-  // gfxFeature is not usable in the GPU process, so we use gfxVars to transmit
-  // this feature
-  gfxVars::SetUseWebRender(true);
   reporter.SetSuccessful();
 
   Preferences::RegisterPrefixCallbackAndCall(WebRenderDebugPrefChangeCallback,
@@ -2807,7 +2796,7 @@ void gfxPlatform::InitWebRenderConfig() {
   }
 
   if (Preferences::GetBool("gfx.webrender.flip-sequential", false)) {
-    if (UseWebRender() && gfxVars::UseWebRenderANGLE()) {
+    if (gfxVars::UseWebRenderANGLE()) {
       gfxVars::SetUseWebRenderFlipSequentialWin(true);
     }
   }
@@ -2878,8 +2867,6 @@ void gfxPlatform::InitHardwareVideoConfig() {
 }
 
 void gfxPlatform::InitWebGLConfig() {
-  // Depends on InitWebRenderConfig() for UseWebRender().
-
   if (!XRE_IsParentProcess()) return;
 
   const nsCOMPtr<nsIGfxInfo> gfxInfo = components::GfxInfo::Service();
@@ -3561,7 +3548,7 @@ bool gfxPlatform::FallbackFromAcceleration(FeatureStatus aStatus,
   if (StaticPrefs::gfx_webrender_fallback_software_d3d11_AtStartup() &&
       swglFallbackAllowed && gfxVars::AllowSoftwareWebRenderD3D11() &&
       gfxConfig::IsEnabled(Feature::D3D11_COMPOSITING) &&
-      gfxVars::UseWebRender() && !gfxVars::UseSoftwareWebRender()) {
+      !gfxVars::UseSoftwareWebRender()) {
     // Fallback to Software WebRender + D3D11 compositing.
     gfxCriticalNote << "Fallback WR to SW-WR + D3D11";
     gfxVars::SetUseSoftwareWebRender(true);
@@ -3586,15 +3573,6 @@ bool gfxPlatform::FallbackFromAcceleration(FeatureStatus aStatus,
   if (gfxConfig::IsEnabled(Feature::D3D11_COMPOSITING)) {
     gfxConfig::GetFeature(Feature::D3D11_COMPOSITING)
         .ForceDisable(aStatus, aMessage, aFailureId);
-
-    if (StaticPrefs::gfx_webrender_fallback_software_AtStartup() &&
-        swglFallbackAllowed && !gfxVars::UseWebRender()) {
-      // Fallback from D3D11 to Software WebRender.
-      gfxCriticalNote << "Fallback D3D11 to SW-WR";
-      gfxVars::SetUseWebRender(true);
-      gfxVars::SetUseSoftwareWebRender(true);
-      return true;
-    }
   }
 #endif
 
@@ -3607,12 +3585,6 @@ bool gfxPlatform::FallbackFromAcceleration(FeatureStatus aStatus,
   }
 #endif
 
-  if (!gfxVars::UseWebRender()) {
-    // We were not using WebRender in the first place, and we have disabled
-    // all forms of accelerated compositing.
-    return false;
-  }
-
   if (StaticPrefs::gfx_webrender_fallback_software_AtStartup() &&
       swglFallbackAllowed && !gfxVars::UseSoftwareWebRender()) {
     // Fallback from WebRender to Software WebRender.
@@ -3621,8 +3593,6 @@ bool gfxPlatform::FallbackFromAcceleration(FeatureStatus aStatus,
     return true;
   }
 
-  MOZ_ASSERT(gfxVars::UseWebRender());
-
   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.
@@ -3648,15 +3618,13 @@ void gfxPlatform::DisableGPUProcess() {
   gfxVars::SetRemoteCanvasEnabled(false);
 
   RemoteTextureMap::Init();
-  if (gfxVars::UseWebRender()) {
-    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();
+  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() {

gfx/thebes/gfxPlatform.h

@@ -232,8 +232,6 @@ class gfxPlatform : public mozilla::layers::MemoryPressureListener {
 
   static bool IsHeadless();
 
-  static bool UseWebRender();
-
   static bool UseRemoteCanvas();
 
   static bool IsBackendAccelerated(

gfx/thebes/gfxWindowsPlatform.cpp

@@ -438,10 +438,7 @@ void gfxWindowsPlatform::InitAcceleration() {
 
 void gfxWindowsPlatform::InitWebRenderConfig() {
   gfxPlatform::InitWebRenderConfig();
-
-  if (gfxVars::UseWebRender()) {
-    UpdateBackendPrefs();
-  }
+  UpdateBackendPrefs();
 }
 
 bool gfxWindowsPlatform::CanUseHardwareVideoDecoding() {
@@ -510,11 +507,6 @@ BackendPrefsData gfxWindowsPlatform::GetBackendPrefs() const {
   if (gfxConfig::IsEnabled(Feature::DIRECT2D)) {
     data.mCanvasBitmask |= BackendTypeBit(BackendType::DIRECT2D1_1);
     data.mCanvasDefault = BackendType::DIRECT2D1_1;
-    // We do not use d2d for content when WebRender is used.
-    if (!gfxVars::UseWebRender()) {
-      data.mContentBitmask |= BackendTypeBit(BackendType::DIRECT2D1_1);
-      data.mContentDefault = BackendType::DIRECT2D1_1;
-    }
   }
   return data;
 }
@@ -592,7 +584,7 @@ mozilla::gfx::BackendType gfxWindowsPlatform::GetPreferredCanvasBackend() {
   mozilla::gfx::BackendType backend = gfxPlatform::GetPreferredCanvasBackend();
 
   if (backend == BackendType::DIRECT2D1_1) {
-    if (gfx::gfxVars::UseWebRender() && !gfx::gfxVars::UseWebRenderANGLE()) {
+    if (!gfx::gfxVars::UseWebRenderANGLE()) {
       // We can't have D2D without ANGLE when WebRender is enabled, so fallback
       // to Skia.
       return BackendType::SKIA;

image/VectorImage.cpp

@@ -18,7 +18,6 @@
 #include "mozilla/dom/SVGSVGElement.h"
 #include "mozilla/dom/SVGDocument.h"
 #include "mozilla/gfx/2D.h"
-#include "mozilla/gfx/gfxVars.h"
 #include "mozilla/PendingAnimationTracker.h"
 #include "mozilla/PresShell.h"
 #include "mozilla/ProfilerLabels.h"
@@ -972,13 +971,7 @@ VectorImage::Draw(gfxContext* aContext, const nsIntSize& aSize,
   // - We are using a DrawTargetRecording because we prefer the drawing commands
   //   in general to the rasterized surface. This allows blob images to avoid
   //   rasterized SVGs with WebRender.
-  // - The size exceeds what we are willing to cache as a rasterized surface.
-  //   We don't do this for WebRender because the performance of the fallback
-  //   path is quite bad and upscaling the SVG from the clamped size is better
-  //   than bringing the browser to a crawl.
-  if (aContext->GetDrawTarget()->GetBackendType() == BackendType::RECORDING ||
-      (!gfxVars::UseWebRender() &&
-       aSize != SurfaceCache::ClampVectorSize(aSize))) {
+  if (aContext->GetDrawTarget()->GetBackendType() == BackendType::RECORDING) {
     aFlags |= FLAG_BYPASS_SURFACE_CACHE;
   }
 

layout/generic/nsIFrame.cpp

@@ -25,7 +25,6 @@
 #include "mozilla/dom/ImageTracker.h"
 #include "mozilla/dom/Selection.h"
 #include "mozilla/gfx/2D.h"
-#include "mozilla/gfx/gfxVars.h"
 #include "mozilla/gfx/PathHelpers.h"
 #include "mozilla/intl/BidiEmbeddingLevel.h"
 #include "mozilla/Maybe.h"
@@ -11497,8 +11496,7 @@ CompositorHitTestInfo nsIFrame::GetCompositorHitTestInfo(
     // If WebRender is enabled, simple clip-paths can be converted into WR
     // clips that WR knows how to hit-test against, so we don't need to mark
     // it as an irregular area.
-    if (!gfxVars::UseWebRender() ||
-        !SVGIntegrationUtils::UsingSimpleClipPathForFrame(this)) {
+    if (!SVGIntegrationUtils::UsingSimpleClipPathForFrame(this)) {
       result += CompositorHitTestFlags::eIrregularArea;
     }
   }

layout/svg/SVGIntegrationUtils.cpp

@@ -18,7 +18,6 @@
 #include "gfxContext.h"
 #include "SVGPaintServerFrame.h"
 #include "mozilla/gfx/Point.h"
-#include "mozilla/gfx/gfxVars.h"
 #include "mozilla/CSSClipPathInstance.h"
 #include "mozilla/FilterInstance.h"
 #include "mozilla/StaticPrefs_layers.h"
@@ -1101,13 +1100,8 @@ bool SVGIntegrationUtils::CanCreateWebRenderFiltersForFrame(nsIFrame* aFrame) {
 bool SVGIntegrationUtils::UsesSVGEffectsNotSupportedInCompositor(
     nsIFrame* aFrame) {
   // WebRender supports masks / clip-paths and some filters in the compositor.
-  // Non-WebRender doesn't support any SVG effects in the compositor.
   if (aFrame->StyleEffects()->HasFilters()) {
-    return !gfx::gfxVars::UseWebRender() ||
-           !SVGIntegrationUtils::CanCreateWebRenderFiltersForFrame(aFrame);
-  }
-  if (SVGIntegrationUtils::UsingMaskOrClipPathForFrame(aFrame)) {
-    return !gfx::gfxVars::UseWebRender();
+    return !SVGIntegrationUtils::CanCreateWebRenderFiltersForFrame(aFrame);
   }
   return false;
 }

toolkit/xre/nsAppRunner.cpp

@@ -736,16 +736,6 @@ nsIXULRuntime::ContentWin32kLockdownState GetLiveWin32kLockdownState() {
     }
   }
 
-  // Win32k Lockdown requires WebRender, but WR is not currently guaranteed
-  // on all computers. It can also fail to initialize and fallback to
-  // non-WR render path.
-  //
-  // We don't want a situation where "Win32k Lockdown + No WR" occurs
-  // without the user explicitly requesting unsupported behavior.
-  if (!gfx::gfxVars::UseWebRender()) {
-    return nsIXULRuntime::ContentWin32kLockdownState::MissingWebRender;
-  }
-
   // Non-native theming is required as well
   if (!StaticPrefs::widget_non_native_theme_enabled()) {
     return nsIXULRuntime::ContentWin32kLockdownState::MissingNonNativeTheming;

widget/GfxInfoBase.cpp

@@ -1840,7 +1840,7 @@ nsresult GfxInfoBase::GetActiveCrashGuards(JSContext* aCx,
 
 NS_IMETHODIMP
 GfxInfoBase::GetWebRenderEnabled(bool* aWebRenderEnabled) {
-  *aWebRenderEnabled = gfxVars::UseWebRender();
+  *aWebRenderEnabled = true;
   return NS_OK;
 }
 

widget/nsBaseWidget.cpp

@@ -1349,20 +1349,13 @@ already_AddRefed<WebRenderLayerManager> nsBaseWidget::CreateCompositorSession(
     gpu->EnsureGPUReady();
 
     // If widget type does not supports acceleration, we may be allowed to use
-    // software WebRender instead. If not, then we use ClientLayerManager even
-    // when gfxVars::UseWebRender() is true. WebRender could coexist only with
-    // BasicCompositor.
+    // software WebRender instead.
     bool supportsAcceleration = WidgetTypeSupportsAcceleration();
-    bool enableWR;
-    bool enableSWWR;
+    bool enableSWWR = true;
     if (supportsAcceleration ||
         StaticPrefs::gfx_webrender_unaccelerated_widget_force()) {
-      enableWR = gfx::gfxVars::UseWebRender();
       enableSWWR = gfx::gfxVars::UseSoftwareWebRender();
-    } else {
-      enableWR = enableSWWR = gfx::gfxVars::UseWebRender();
     }
-    MOZ_RELEASE_ASSERT(enableWR);
     bool enableAPZ = UseAPZ();
     CompositorOptions options(enableAPZ, enableSWWR);
 

widget/windows/nsWindow.cpp

@@ -7957,14 +7957,6 @@ void nsWindow::SetWindowTranslucencyInner(nsTransparencyMode aMode) {
                reinterpret_cast<HBRUSH>(GetStockObject(BLACK_BRUSH)));
     ReleaseDC(mWnd, hdc);
   }
-
-  // Disable double buffering with D3D compositor for disabling compositor
-  // window usage.
-  if (HasGlass() && !gfxVars::UseWebRender() &&
-      gfxVars::UseDoubleBufferingWithCompositor()) {
-    gfxVars::SetUseDoubleBufferingWithCompositor(false);
-    GPUProcessManager::Get()->ResetCompositors();
-  }
 }
 
 /**************************************************************