gecko-dev/widget/nsShmImage.h

91 lines
2.6 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* 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__
#include "mozilla/ipc/SharedMemorySysV.h"
#if defined(MOZ_X11) && defined(MOZ_HAVE_SHAREDMEMORYSYSV)
# define MOZ_HAVE_SHMIMAGE
#endif
#ifdef MOZ_HAVE_SHMIMAGE
#include "mozilla/gfx/2D.h"
#include "nsIWidget.h"
#include "nsAutoPtr.h"
#include "mozilla/X11Util.h"
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/XShm.h>
#ifdef MOZ_WIDGET_QT
class QRect;
class QWindow;
#endif
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)
typedef mozilla::ipc::SharedMemorySysV SharedMemorySysV;
public:
static bool UseShm();
static already_AddRefed<nsShmImage>
Create(const mozilla::LayoutDeviceIntSize& aSize,
Display* aDisplay, Visual* aVisual, unsigned int aDepth);
static already_AddRefed<mozilla::gfx::DrawTarget>
EnsureShmImage(const mozilla::LayoutDeviceIntSize& aSize,
Display* aDisplay, Visual* aVisual, unsigned int aDepth,
RefPtr<nsShmImage>& aImage);
private:
~nsShmImage() {
if (mImage) {
mozilla::FinishX(mDisplay);
if (mXAttached) {
XShmDetach(mDisplay, &mInfo);
}
XDestroyImage(mImage);
}
}
public:
already_AddRefed<mozilla::gfx::DrawTarget> CreateDrawTarget();
#ifdef MOZ_WIDGET_GTK
void Put(Display* aDisplay, Drawable aWindow,
const mozilla::LayoutDeviceIntRegion& aRegion);
#elif defined(MOZ_WIDGET_QT)
void Put(QWindow* aWindow, QRect& aRect);
#endif
mozilla::LayoutDeviceIntSize Size() const { return mSize; }
private:
nsShmImage()
: mImage(nullptr)
, mDisplay(nullptr)
, mFormat(mozilla::gfx::SurfaceFormat::UNKNOWN)
, mXAttached(false)
{ mInfo.shmid = SharedMemorySysV::NULLHandle(); }
RefPtr<SharedMemorySysV> mSegment;
XImage* mImage;
Display* mDisplay;
XShmSegmentInfo mInfo;
mozilla::LayoutDeviceIntSize mSize;
mozilla::gfx::SurfaceFormat mFormat;
bool mXAttached;
};
#endif // MOZ_HAVE_SHMIMAGE
#endif