Differential D5179 Diff 12835 plugins/platforms/drm/drm_buffer_gbm.cpp

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plugins/platforms/drm/drm_buffer_gbm.cpp

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		1		/********************************************************************
		2		KWin - the KDE window manager
		3		This file is part of the KDE project.
		4
		5		Copyright 2017 Roman Gilg <subdiff@gmail.com>
		6		Copyright 2015 Martin Gräßlin <mgraesslin@kde.org>
		7
		8		This program is free software; you can redistribute it and/or modify
		9		it under the terms of the GNU General Public License as published by
		10		the Free Software Foundation; either version 2 of the License, or
		11		(at your option) any later version.
		12
		13		This program is distributed in the hope that it will be useful,
		14		but WITHOUT ANY WARRANTY; without even the implied warranty of
		15		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		16		GNU General Public License for more details.
		17
		18		You should have received a copy of the GNU General Public License
		19		along with this program. If not, see <http://www.gnu.org/licenses/>.
		20		*********************************************************************/
		21		#include "drm_backend.h"
		22		#include "drm_buffer_gbm.h"
		23
		24		#include "logging.h"
		25
		26		// system
		27		#include <sys/mman.h>
		28		#include <errno.h>
		29		// drm
		30		#include <xf86drm.h>
		31		#include <gbm.h>
		32
		33		namespace KWin
		34		{
		35
		36		// DrmSurfaceBuffer
		37		DrmSurfaceBuffer::DrmSurfaceBuffer(DrmBackend backend, gbm_surface surface)
		38		: DrmBuffer(backend)
		39		, m_surface(surface)
		40		{
		41		m_bo = gbm_surface_lock_front_buffer(surface);
		42		if (!m_bo) {
		43		qCWarning(KWIN_DRM) << "Locking front buffer failed";
		44		return;
		45		}
		46		m_size = QSize(gbm_bo_get_width(m_bo), gbm_bo_get_height(m_bo));
		47		if (drmModeAddFB(m_backend->fd(), m_size.width(), m_size.height(), 24, 32, gbm_bo_get_stride(m_bo), gbm_bo_get_handle(m_bo).u32, &m_bufferId) != 0) {
		48		qCWarning(KWIN_DRM) << "drmModeAddFB failed";
		49		}
		50		gbm_bo_set_user_data(m_bo, this, nullptr);
		51		}
		52
		53		DrmSurfaceBuffer::~DrmSurfaceBuffer()
		54		{
		55		if (m_bufferId) {
		56		drmModeRmFB(m_backend->fd(), m_bufferId);
		57		}
		58		releaseGbm();
		59		}
		60
		61		void DrmSurfaceBuffer::releaseGbm()
		62		{
		63		if (m_bo) {
		64		gbm_surface_release_buffer(m_surface, m_bo);
		65		m_bo = nullptr;
		66		}
		67		}
		68
		69		}