Bug 1682280 - Allow VAAPI hardware video decoding to be blocked via the blocklist. r=stransky

Differential Revision: https://phabricator.services.mozilla.com/D99672

widget/gtk/DMABufLibWrapper.cpp

@@ -240,7 +240,8 @@ bool nsDMABufDevice::IsDMABufTexturesEnabled() { return false; }
 #endif
 bool nsDMABufDevice::IsDMABufVAAPIEnabled() {
   return gfx::gfxVars::UseEGL() && IsDMABufEnabled() &&
-         StaticPrefs::media_ffmpeg_vaapi_enabled();
+         StaticPrefs::media_ffmpeg_vaapi_enabled() &&
+         gfx::gfxVars::CanUseHardwareVideoDecoding();
 }
 bool nsDMABufDevice::IsDMABufWebGLEnabled() {
   return gfx::gfxVars::UseEGL() && IsDMABufEnabled() &&