7228e9aefd
This unifies frame hooks for OpenGL and QPainter render backends. There are a couple of reasons why it's a good idea - it provides one mental framework to start painting a frame, the Compositor will be able to start and submit frames. The last one is very cool because it gives the Compositor more power over compositing. Besides unifying frame hooks, this cleans up a bit the arg naming mess in endFrame(). As is, "damage" and "damagedRegion" are very confusing names. "damage" arg has been renamed to "renderedRegion," because that's what it is. The renderedRegion arg specifies the region that has been repainted by the Scene. It's different from the damagedRegion as that one specifies the surface damage, i.e. the difference between the current and the next frame, while the renderedRegion may include a region that had to be repainted to repair the back buffer. The main reason why we need renderedRegion is the X11 platform. On Wayland, it's unused. In the future, we will need to extend this api with output layers.
102 lines
2.3 KiB
C++
102 lines
2.3 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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SPDX-FileCopyrightText: 2019 Roman Gilg <subdiff@gmail.com>
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SPDX-FileCopyrightText: 2013, 2015 Martin Gräßlin <mgraesslin@kde.org>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef KWIN_SCENE_QPAINTER_WAYLAND_BACKEND_H
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#define KWIN_SCENE_QPAINTER_WAYLAND_BACKEND_H
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#include "qpainterbackend.h"
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#include "utils.h"
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#include <QObject>
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#include <QImage>
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#include <QWeakPointer>
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namespace KWayland
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{
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namespace Client
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{
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class ShmPool;
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class Buffer;
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}
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}
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namespace KWin
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{
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class AbstractOutput;
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namespace Wayland
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{
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class WaylandBackend;
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class WaylandOutput;
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class WaylandQPainterBackend;
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class WaylandQPainterBufferSlot
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{
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public:
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WaylandQPainterBufferSlot(QSharedPointer<KWayland::Client::Buffer> buffer);
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~WaylandQPainterBufferSlot();
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QSharedPointer<KWayland::Client::Buffer> buffer;
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QImage image;
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int age = 0;
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};
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class WaylandQPainterOutput : public QObject
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{
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Q_OBJECT
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public:
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WaylandQPainterOutput(WaylandOutput *output, QObject *parent = nullptr);
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~WaylandQPainterOutput() override;
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bool init(KWayland::Client::ShmPool *pool);
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void updateSize(const QSize &size);
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void remapBuffer();
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WaylandQPainterBufferSlot *back() const;
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WaylandQPainterBufferSlot *acquire();
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void present(const QRegion &damage);
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QRegion accumulateDamage(int bufferAge) const;
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QRegion mapToLocal(const QRegion ®ion) const;
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private:
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WaylandOutput *m_waylandOutput;
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KWayland::Client::ShmPool *m_pool;
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DamageJournal m_damageJournal;
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QVector<WaylandQPainterBufferSlot *> m_slots;
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WaylandQPainterBufferSlot *m_back = nullptr;
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friend class WaylandQPainterBackend;
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};
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class WaylandQPainterBackend : public QPainterBackend
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{
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Q_OBJECT
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public:
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explicit WaylandQPainterBackend(WaylandBackend *b);
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~WaylandQPainterBackend() override;
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QImage *bufferForScreen(AbstractOutput *output) override;
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void endFrame(AbstractOutput *output, const QRegion &renderedRegion, const QRegion &damagedRegion) override;
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QRegion beginFrame(AbstractOutput *output) override;
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private:
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void createOutput(AbstractOutput *waylandOutput);
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void frameRendered();
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WaylandBackend *m_backend;
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QMap<AbstractOutput *, WaylandQPainterOutput*> m_outputs;
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};
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}
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}
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#endif
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