widget/nsShmImage.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  *
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef __mozilla_widget_nsShmImage_h__
   8 #define __mozilla_widget_nsShmImage_h__
   9
  10 #if defined(MOZ_X11)
  11 #  define MOZ_HAVE_SHMIMAGE
  12 #endif
  13
  14 #ifdef MOZ_HAVE_SHMIMAGE
  15
  16 #  include "mozilla/gfx/2D.h"
  17 #  include "nsIWidget.h"
  18 #  include "Units.h"
  19
  20 #  include <X11/Xlib-xcb.h>
  21 #  include <xcb/shm.h>
  22
  23 class nsShmImage {
  24   // bug 1168843, compositor thread may create shared memory instances that are
  25   // destroyed by main thread on shutdown, so this must use thread-safe RC to
  26   // avoid hitting assertion
  27   NS_INLINE_DECL_THREADSAFE_REFCOUNTING(nsShmImage)
  28
  29  public:
  30   static bool UseShm();
  31
  32   already_AddRefed<mozilla::gfx::DrawTarget> CreateDrawTarget(
  33       const mozilla::LayoutDeviceIntRegion& aRegion);
  34
  35   void Put(const mozilla::LayoutDeviceIntRegion& aRegion);
  36
  37   nsShmImage(Display* aDisplay, Drawable aWindow, Visual* aVisual,
  38              unsigned int aDepth);
  39
  40  private:
  41   ~nsShmImage();
  42
  43   bool InitExtension();
  44
  45   bool CreateShmSegment();
  46   void DestroyShmSegment();
  47
  48   bool CreateImage(const mozilla::gfx::IntSize& aSize);
  49   void DestroyImage();
  50
  51   void WaitIfPendingReply();
  52
  53   Display* mDisplay;
  54   xcb_connection_t* mConnection;
  55   Window mWindow;
  56   Visual* mVisual;
  57   unsigned int mDepth;
  58
  59   mozilla::gfx::SurfaceFormat mFormat;
  60   mozilla::gfx::IntSize mSize;
  61   int mStride;
  62
  63   xcb_pixmap_t mPixmap;
  64   xcb_gcontext_t mGC;
  65   xcb_get_input_focus_cookie_t mSyncRequest;
  66   bool mRequestPending;
  67
  68   xcb_shm_seg_t mShmSeg;
  69   int mShmId;
  70   uint8_t* mShmAddr;
  71 };
  72
  73 #endif  // MOZ_HAVE_SHMIMAGE
  74
  75 #endif