widget/nsShmImage.h
author L10n Bumper Bot <release+l10nbumper@mozilla.com>
Mon, 14 Jan 2019 04:00:15 -0800
changeset 506679 b6bde01c7a183e9191a23a005734b747d321620a
parent 505383 6f3709b3878117466168c40affa7bca0b60cf75b
child 511623 5f4630838d46dd81dadb13220a4af0da9e23a619
permissions -rw-r--r--
no bug - Bumping Fennec l10n changesets r=release a=l10n-bump DONTBUILD cak -> 3bd3d9938de2 ml -> da8508490cac trs -> a73bd0fa9499 uk -> de7742fa098e ur -> f3bfe0211b0d uz -> 6c42381becf7 vi -> 18fe987ca77d wo -> eaabeed6eb6c xh -> 1fe19625ce80 zam -> 5b7a669c784f zh-CN -> 2ff77a53b21c zh-TW -> 574f9f4100d8

/* -*- 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