nsShmImage.h - mozsearch

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/* -*- 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