widget/nsShmImage.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
   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 #include "mozilla/ipc/SharedMemorySysV.h"
  11
  12 #if defined(MOZ_X11) && defined(MOZ_HAVE_SHAREDMEMORYSYSV)
  13 #  define MOZ_HAVE_SHMIMAGE
  14 #endif
  15
  16 #ifdef MOZ_HAVE_SHMIMAGE
  17
  18 #include "nsIWidget.h"
  19 #include "gfxTypes.h"
  20 #include "nsAutoPtr.h"
  21
  22 #include "mozilla/X11Util.h"
  23 #include <X11/Xlib.h>
  24 #include <X11/Xutil.h>
  25 #include <X11/extensions/XShm.h>
  26
  27 #if defined(MOZ_WIDGET_GTK)
  28 #define DISPLAY gdk_x11_get_default_xdisplay
  29 #elif defined(MOZ_WIDGET_QT)
  30 #define DISPLAY mozilla::DefaultXDisplay
  31 #endif
  32
  33 class QRect;
  34 class QWindow;
  35 class gfxASurface;
  36
  37 class nsShmImage {
  38     NS_INLINE_DECL_REFCOUNTING(nsShmImage)
  39
  40     typedef mozilla::ipc::SharedMemorySysV SharedMemorySysV;
  41
  42 public:
  43     typedef gfxImageFormat Format;
  44
  45     static bool UseShm();
  46     static already_AddRefed<nsShmImage>
  47         Create(const gfxIntSize& aSize, Visual* aVisual, unsigned int aDepth);
  48     static already_AddRefed<gfxASurface>
  49         EnsureShmImage(const gfxIntSize& aSize, Visual* aVisual, unsigned int aDepth,
  50                        nsRefPtr<nsShmImage>& aImage);
  51
  52 private:
  53     ~nsShmImage() {
  54         if (mImage) {
  55             mozilla::FinishX(DISPLAY());
  56             if (mXAttached) {
  57                 XShmDetach(DISPLAY(), &mInfo);
  58             }
  59             XDestroyImage(mImage);
  60         }
  61     }
  62
  63 public:
  64     already_AddRefed<gfxASurface> AsSurface();
  65
  66 #if (MOZ_WIDGET_GTK == 2)
  67     void Put(GdkWindow* aWindow, GdkRectangle* aRects, GdkRectangle* aEnd);
  68 #elif (MOZ_WIDGET_GTK == 3)
  69     void Put(GdkWindow* aWindow, cairo_rectangle_list_t* aRects);
  70 #elif defined(MOZ_WIDGET_QT)
  71     void Put(QWindow* aWindow, QRect& aRect);
  72 #endif
  73
  74     gfxIntSize Size() const { return mSize; }
  75
  76 private:
  77     nsShmImage()
  78         : mImage(nullptr)
  79         , mXAttached(false)
  80     { mInfo.shmid = SharedMemorySysV::NULLHandle(); }
  81
  82     nsRefPtr<SharedMemorySysV>   mSegment;
  83     XImage*                      mImage;
  84     XShmSegmentInfo              mInfo;
  85     gfxIntSize                   mSize;
  86     Format                       mFormat;
  87     bool                         mXAttached;
  88 };
  89
  90 #endif // MOZ_HAVE_SHMIMAGE
  91
  92 #endif