virtual_backend.h

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/*
    KWin - the KDE window manager
    This file is part of the KDE project.
 
    SPDX-FileCopyrightText: 2015 Martin Gräßlin <mgraesslin@kde.org>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
#pragma once
 
#include "core/outputbackend.h"
#include "utils/filedescriptor.h"
 
#include <QRect>
 
struct gbm_device;
 
namespace KWin
{
class VirtualBackend;
class VirtualOutput;
 
class KWIN_EXPORT VirtualBackend : public OutputBackend
{
    Q_OBJECT
 
public:
    VirtualBackend(QObject *parent = nullptr);
    ~VirtualBackend() override;
 
    bool initialize() override;
 
    std::unique_ptr<QPainterBackend> createQPainterBackend() override;
    std::unique_ptr<OpenGLBackend> createOpenGLBackend() override;
 
    struct OutputInfo
    {
        QRect geometry;
        double scale = 1;
        bool internal = false;
    };
    Output *addOutput(const OutputInfo &info);
    void setVirtualOutputs(const QList<OutputInfo> &infos);
 
    Outputs outputs() const override;
 
    QList<CompositingType> supportedCompositors() const override;
 
    void setEglDisplay(std::unique_ptr<EglDisplay> &&display);
    EglDisplay *sceneEglDisplayObject() const override;
 
    gbm_device *gbmDevice() const;
 
Q_SIGNALS:
    void virtualOutputsSet(bool countChanged);
 
private:
    VirtualOutput *createOutput(const OutputInfo &info);
 
    QList<VirtualOutput *> m_outputs;
    std::unique_ptr<EglDisplay> m_display;
    FileDescriptor m_drmFileDescriptor;
    gbm_device *m_gbmDevice = nullptr;
};
 
} // namespace KWin