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 when the page flip happens the DrmSurfaceBuffer will try to destroy the gbm_bo and crash as the gbm_surface is no longer valid.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
1.5 KiB
C++
55 lines
1.5 KiB
C++
/********************************************************************
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KWin - the KDE window manager
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This file is part of the KDE project.
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Copyright (C) 2017 Martin Flöser <mgraesslin@kde.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************/
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#include "gbm_surface.h"
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#include <gbm.h>
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namespace KWin
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{
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GbmSurface::GbmSurface(gbm_device *gbm, uint32_t width, uint32_t height, uint32_t format, uint32_t flags)
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: m_surface(gbm_surface_create(gbm, width, height, format, flags))
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{
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}
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GbmSurface::~GbmSurface()
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{
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if (m_surface) {
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gbm_surface_destroy(m_surface);
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}
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}
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gbm_bo *GbmSurface::lockFrontBuffer()
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{
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if (!m_surface) {
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return nullptr;
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}
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return gbm_surface_lock_front_buffer(m_surface);
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}
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void GbmSurface::releaseBuffer(gbm_bo *bo)
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{
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if (!bo || !m_surface) {
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return;
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}
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gbm_surface_release_buffer(m_surface, bo);
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}
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}
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