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 destroyed by main thread on shutdown, so this must use thread-safe RC to avoid hitting assertion
  25   NS_INLINE_DECL_THREADSAFE_REFCOUNTING(nsShmImage)
  26
  27 public:
  28   static bool UseShm();
  29
  30   already_AddRefed<mozilla::gfx::DrawTarget>
  31     CreateDrawTarget(const mozilla::LayoutDeviceIntRegion& aRegion);
  32
  33   void Put(const mozilla::LayoutDeviceIntRegion& aRegion);
  34
  35   nsShmImage(Display* aDisplay,
  36              Drawable aWindow,
  37              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