1 files changed, 75 insertions, 0 deletions
diff --git a/widget/nsShmImage.h b/widget/nsShmImage.h
new file mode 100644
index 000000000..dae09c6c8
--- /dev/null
+++ b/widget/nsShmImage.h
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 8; 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/. */
+
+#ifndef __mozilla_widget_nsShmImage_h__
+#define __mozilla_widget_nsShmImage_h__
+
+#if defined(MOZ_X11)
+#  define MOZ_HAVE_SHMIMAGE
+#endif
+
+#ifdef MOZ_HAVE_SHMIMAGE
+
+#include "mozilla/gfx/2D.h"
+#include "nsIWidget.h"
+#include "Units.h"
+
+#include <X11/Xlib-xcb.h>
+#include <xcb/shm.h>
+
+class nsShmImage {
+  // bug 1168843, compositor thread may create shared memory instances that are destroyed by main thread on shutdown, so this must use thread-safe RC to avoid hitting assertion
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(nsShmImage)
+
+public:
+  static bool UseShm();
+
+  already_AddRefed<mozilla::gfx::DrawTarget>
+    CreateDrawTarget(const mozilla::LayoutDeviceIntRegion& aRegion);
+
+  void Put(const mozilla::LayoutDeviceIntRegion& aRegion);
+
+  nsShmImage(Display* aDisplay,
+             Drawable aWindow,
+             Visual* aVisual,
+             unsigned int aDepth);
+
+private:
+  ~nsShmImage();
+
+  bool InitExtension();
+
+  bool CreateShmSegment();
+  void DestroyShmSegment();
+
+  bool CreateImage(const mozilla::gfx::IntSize& aSize);
+  void DestroyImage();
+
+  void WaitIfPendingReply();
+
+  Display*                     mDisplay;
+  xcb_connection_t*            mConnection;
+  Window                       mWindow;
+  Visual*                      mVisual;
+  unsigned int                 mDepth;
+
+  mozilla::gfx::SurfaceFormat  mFormat;
+  mozilla::gfx::IntSize        mSize;
+  int                          mStride;
+
+  xcb_pixmap_t                 mPixmap;
+  xcb_gcontext_t               mGC;
+  xcb_get_input_focus_cookie_t mSyncRequest;
+  bool                         mRequestPending;
+
+  xcb_shm_seg_t                mShmSeg;
+  int                          mShmId;
+  uint8_t*                     mShmAddr;
+};
+
+#endif // MOZ_HAVE_SHMIMAGE
+
+#endif