Bug 1171094. Disallow D3D11 ANGLE with old DisplayLink drivers. r=Bas

--HG--
extra : rebase_source : 93fbda95aa8b4ec57d6ecfa0859e8bb319135cdf

gfx/thebes/gfxPlatform.cpp

@@ -2246,7 +2246,7 @@ gfxPlatform::OptimalFormatForContent(gfxContentType aContent)
  */
 static bool sLayersSupportsD3D9 = false;
 static bool sLayersSupportsD3D11 = false;
-static bool sANGLESupportsD3D11 = false;
+bool gANGLESupportsD3D11 = false;
 static bool sLayersSupportsHardwareVideoDecoding = false;
 static bool sLayersHardwareVideoDecodingFailed = false;
 static bool sBufferRotationCheckPref = true;
@@ -2291,7 +2291,7 @@ InitLayersAccelerationPrefs()
       }
       if (NS_SUCCEEDED(gfxInfo->GetFeatureStatus(nsIGfxInfo::FEATURE_DIRECT3D_11_ANGLE, &status))) {
         if (status == nsIGfxInfo::FEATURE_STATUS_OK) {
-          sANGLESupportsD3D11 = true;
+          gANGLESupportsD3D11 = true;
         }
       }
     }
@@ -2347,7 +2347,7 @@ bool
 gfxPlatform::CanUseDirect3D11ANGLE()
 {
   MOZ_ASSERT(sLayersAccelerationPrefsInitialized);
-  return sANGLESupportsD3D11;
+  return gANGLESupportsD3D11;
 }
 
 

gfx/thebes/gfxPlatform.h

@@ -131,6 +131,8 @@ enum eGfxLog {
 // when searching through pref langs, max number of pref langs
 const uint32_t kMaxLenPrefLangList = 32;
 
+extern bool gANGLESupportsD3D11;
+
 #define UNINITIALIZED_VALUE  (-1)
 
 inline const char*

gfx/thebes/gfxWindowsPlatform.cpp

@@ -1718,12 +1718,14 @@ bool DoesD3D11DeviceWork(ID3D11Device *device)
 #if defined(MOZ_CRASHREPORTER)
       CrashReporter::AppendAppNotesToCrashReport(NS_LITERAL_CSTRING("DisplayLink: could not parse version\n"));
 #endif
+      gANGLESupportsD3D11 = false;
       return false;
     }
     if (displayLinkModuleVersion <= V(8,6,1,36484)) {
 #if defined(MOZ_CRASHREPORTER)
       CrashReporter::AppendAppNotesToCrashReport(NS_LITERAL_CSTRING("DisplayLink: too old version\n"));
 #endif
+      gANGLESupportsD3D11 = false;
       return false;
     }
   }