47343fb8f7
Summary: The gbm_surface is owned by the EglGbmBackend, but it's not the only one using it. The DrmSurfaceBuffer is also using it and needs it to destroy the gbm_bo. Now this can become a problem in the following situation: * a page flip is still pending * the EglGbmBackend destroys the gbm_surface -> when the page flip happens the DrmSurfaceBuffer will try to destroy the gbm_bo and crash as the gbm_surface is no longer valid. This situation can happen when switching screens or when switching compositing backend (OpenGL 2 -> OpenGL 3). To address this problem a class GbmSurface is added which wrapps the gbm_surface pointer. The EglGbmBackend creates and holds a shared pointer to the GbmSurface and passes that one to the DrmSurfaceBuffer. So when cleaning up the gbm_surface only the shared pointer is reset and in case the DrmSurfaceBuffer still needs it, it can access it without problems. BUG: 385372 FIXED-IN: 5.11.0 Test Plan: Not yet Reviewers: #kwin, #plasma, subdiff Subscribers: plasma-devel, kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D8152
55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
/********************************************************************
|
|
KWin - the KDE window manager
|
|
This file is part of the KDE project.
|
|
|
|
Copyright (C) 2017 Martin Flöser <mgraesslin@kde.org>
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*********************************************************************/
|
|
#ifndef KWIN_DRM_GBM_SURFACE_H
|
|
#define KWIN_DRM_GBM_SURFACE_H
|
|
|
|
#include <stdint.h>
|
|
|
|
struct gbm_bo;
|
|
struct gbm_device;
|
|
struct gbm_surface;
|
|
|
|
namespace KWin
|
|
{
|
|
|
|
class GbmSurface
|
|
{
|
|
public:
|
|
explicit GbmSurface(gbm_device *gbm, uint32_t width, uint32_t height, uint32_t format, uint32_t flags);
|
|
~GbmSurface();
|
|
|
|
gbm_bo *lockFrontBuffer();
|
|
void releaseBuffer(gbm_bo *bo);
|
|
|
|
operator bool() const {
|
|
return m_surface != nullptr;
|
|
}
|
|
|
|
operator gbm_surface*() const {
|
|
return m_surface;
|
|
}
|
|
|
|
private:
|
|
gbm_surface *m_surface;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|