From: stransky <stransky@redhat.com>
Date: Tue, 29 Aug 2023 12:43:00 +0000
Subject: Bug 1821629 [DMABuf] Don't use DMABuf if it's disabled by Firefox gfx
 config r=ng,webrtc-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D172224
Mercurial Revision: https://hg.mozilla.org/mozilla-central/rev/158a888cad8869a2f0026fa7cfaaa13ecbfcf2ed
---
 .../linux/wayland/shared_screencast_stream.cc            | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc b/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc
index 0bced6d0cb..1a255aad45 100644
--- a/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc
+++ b/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc
@@ -60,6 +60,13 @@
 #include "rtc_base/thread_annotations.h"
 #include "rtc_base/time_utils.h"
 
+// Wrapper for gfxVars::UseDMABuf() as we can't include gfxVars here.
+// We don't want to use dmabuf of known broken systems.
+// See FEATURE_DMABUF for details.
+namespace mozilla::gfx {
+bool IsDMABufEnabled();
+}
+
 namespace webrtc {
 
 constexpr int kBytesPerPixel = 4;
@@ -346,7 +353,7 @@ void SharedScreenCastStreamPrivate::OnStreamParamChanged(
     RTC_LOG(LS_INFO) << sb.str();
   }
 
-  const int buffer_types = has_modifier
+  const int buffer_types = has_modifier && mozilla::gfx::IsDMABufEnabled()
                                ? (1 << SPA_DATA_DmaBuf) | (1 << SPA_DATA_MemFd)
                                : (1 << SPA_DATA_MemFd);