1 files changed, 27 insertions, 0 deletions
diff --git a/widget/gtk/WindowSurfaceX11SHM.cpp b/widget/gtk/WindowSurfaceX11SHM.cpp
new file mode 100644
index 0000000000..889881d22d
--- /dev/null
+++ b/widget/gtk/WindowSurfaceX11SHM.cpp
@@ -0,0 +1,27 @@
+/* -*- Mode: C++; tab-width: 4; 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 "WindowSurfaceX11SHM.h"
+
+namespace mozilla::widget {
+
+WindowSurfaceX11SHM::WindowSurfaceX11SHM(Display* aDisplay, Drawable aWindow,
+                                         Visual* aVisual, unsigned int aDepth) {
+  mFrontImage = new nsShmImage(aDisplay, aWindow, aVisual, aDepth);
+  mBackImage = new nsShmImage(aDisplay, aWindow, aVisual, aDepth);
+}
+
+already_AddRefed<gfx::DrawTarget> WindowSurfaceX11SHM::Lock(
+    const LayoutDeviceIntRegion& aRegion) {
+  mBackImage.swap(mFrontImage);
+  return mBackImage->CreateDrawTarget(aRegion);
+}
+
+void WindowSurfaceX11SHM::Commit(const LayoutDeviceIntRegion& aInvalidRegion) {
+  mBackImage->Put(aInvalidRegion);
+}
+
+}  // namespace mozilla::widget