kwin/src/plugins/platforms/drm/drm_buffer_gbm.h

/*
    KWin - the KDE window manager
    This file is part of the KDE project.

    SPDX-FileCopyrightText: 2017 Roman Gilg <subdiff@gmail.com>
    SPDX-FileCopyrightText: 2015 Martin Gräßlin <mgraesslin@kde.org>

    SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef KWIN_DRM_BUFFER_GBM_H
#define KWIN_DRM_BUFFER_GBM_H

#include "drm_buffer.h"

#include <QSharedPointer>

struct gbm_bo;

namespace KWaylandServer
{
class BufferInterface;
}

namespace KWin
{

class GbmSurface;

class GbmBuffer : public QObject
{
    Q_OBJECT
public:
    GbmBuffer(GbmSurface *surface, gbm_bo *bo);
    GbmBuffer(gbm_bo *buffer, KWaylandServer::BufferInterface *bufferInterface);
    virtual ~GbmBuffer();

    gbm_bo* getBo() const {
        return m_bo;
    }

    void releaseBuffer();

    bool map(uint32_t flags);
    void *mappedData() const {
        return m_data;
    }
    uint32_t stride() const {
        return m_stride;
    }

protected:
    GbmSurface *m_surface = nullptr;
    gbm_bo *m_bo = nullptr;
    KWaylandServer::BufferInterface *m_bufferInterface = nullptr;

    void *m_data = nullptr;
    void *m_mapping = nullptr;
    uint32_t m_stride = 0;

    void clearBufferInterface();
};

class DrmGbmBuffer : public DrmBuffer, public GbmBuffer
{
public:
    DrmGbmBuffer(DrmGpu *gpu, GbmSurface *surface, gbm_bo *bo);
    DrmGbmBuffer(DrmGpu *gpu, gbm_bo *buffer, KWaylandServer::BufferInterface *bufferInterface);
    ~DrmGbmBuffer() override;

    bool needsModeChange(DrmBuffer *b) const override {
        if (DrmGbmBuffer *sb = dynamic_cast<DrmGbmBuffer*>(b)) {
            return hasBo() != sb->hasBo();
        } else {
            return true;
        }
    }

    bool hasBo() const {
        return m_bo != nullptr;
    }

private:
    void initialize();
};

}

#endif