qcocoabackingstore.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QBACKINGSTORE_COCOA_H
#define QBACKINGSTORE_COCOA_H
 
#include <QtGui/private/qrasterbackingstore_p.h>
 
#include <private/qcore_mac_p.h>
 
#include <QScopedPointer>
#include "qiosurfacegraphicsbuffer.h"
 
#include <unordered_map>
 
QT_BEGIN_NAMESPACE
 
class QCocoaBackingStore : public QPlatformBackingStore
{
protected:
    QCocoaBackingStore(QWindow *window);
    QCFType<CGColorSpaceRef> colorSpace() const;
};
 
class QCALayerBackingStore : public QObject, public QCocoaBackingStore
{
    Q_OBJECT
public:
    QCALayerBackingStore(QWindow *window);
    ~QCALayerBackingStore();
 
    void resize(const QSize &size, const QRegion &staticContents) override;
 
    void beginPaint(const QRegion &region) override;
    QPaintDevice *paintDevice() override;
    void endPaint() override;
 
    bool scroll(const QRegion &region, int dx, int dy) override;
 
    void flush(QWindow *, const QRegion &, const QPoint &) override;
 
    FlushResult rhiFlush(QWindow *window,
                         qreal sourceDevicePixelRatio,
                         const QRegion &region,
                         const QPoint &offset,
                         QPlatformTextureList *textures,
                         bool translucentBackground) override;
 
    QImage toImage() const override;
    QPlatformGraphicsBuffer *graphicsBuffer() const override;
 
private:
    void observeBackingPropertiesChanges();
    bool eventFilter(QObject *watched, QEvent *event) override;
 
    QSize m_requestedSize;
 
    class GraphicsBuffer : public QIOSurfaceGraphicsBuffer
    {
    public:
        GraphicsBuffer(const QSize &size, qreal devicePixelRatio,
                const QPixelFormat &format, QCFType<CGColorSpaceRef> colorSpace);
 
        QRegion dirtyRegion; // In unscaled coordinates
        QImage *asImage();
        qreal devicePixelRatio() const { return m_devicePixelRatio; }
        bool isDirty() const { return !dirtyRegion.isEmpty(); }
        QRegion validRegion() const;
 
    private:
        qreal m_devicePixelRatio;
        QImage m_image;
    };
 
    void updateDirtyStates(const QRegion &paintedRegion);
 
    void ensureBackBuffer();
    bool recreateBackBufferIfNeeded();
    void finalizeBackBuffer();
 
    void preserveFromFrontBuffer(const QRegion &region, const QPoint &offset = QPoint());
 
    void backingPropertiesChanged();
    QMacNotificationObserver m_backingPropertiesObserver;
 
    std::list<std::unique_ptr<GraphicsBuffer>> m_buffers;
 
    void flushSubWindow(QWindow *window);
    std::unordered_map<QWindow*, std::unique_ptr<QCALayerBackingStore>> m_subWindowBackingstores;
    void windowDestroyed(QObject *object);
    bool m_clearSurfaceOnPaint = true;
};
 
QT_END_NAMESPACE
 
#endif