qquickframebufferobject.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 QQUICKFRAMEBUFFEROBJECT_H
#define QQUICKFRAMEBUFFEROBJECT_H
 
#include <QtQuick/QQuickItem>
 
QT_BEGIN_NAMESPACE
 
class QOpenGLFramebufferObject;
class QQuickFramebufferObjectPrivate;
class QSGFramebufferObjectNode;
 
class Q_QUICK_EXPORT QQuickFramebufferObject : public QQuickItem
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(QQuickFramebufferObject)
 
    Q_PROPERTY(bool textureFollowsItemSize READ textureFollowsItemSize WRITE setTextureFollowsItemSize NOTIFY textureFollowsItemSizeChanged)
    Q_PROPERTY(bool mirrorVertically READ mirrorVertically WRITE setMirrorVertically NOTIFY mirrorVerticallyChanged)
 
public:
 
    class Q_QUICK_EXPORT Renderer {
    protected:
        Renderer();
        virtual ~Renderer();
        virtual void render() = 0;
        virtual QOpenGLFramebufferObject *createFramebufferObject(const QSize &size);
        virtual void synchronize(QQuickFramebufferObject *);
        QOpenGLFramebufferObject *framebufferObject() const;
        void update();
        void invalidateFramebufferObject();
    private:
        friend class QSGFramebufferObjectNode;
        friend class QQuickFramebufferObject;
        void *data;
    };
 
    QQuickFramebufferObject(QQuickItem *parent = nullptr);
 
    bool textureFollowsItemSize() const;
    void setTextureFollowsItemSize(bool follows);
 
    bool mirrorVertically() const;
    void setMirrorVertically(bool enable);
 
    virtual Renderer *createRenderer() const = 0;
 
    bool isTextureProvider() const override;
    QSGTextureProvider *textureProvider() const override;
    void releaseResources() override;
 
protected:
    void geometryChange(const QRectF &newGeometry, const QRectF &oldGeometry) override;
 
protected:
    QSGNode *updatePaintNode(QSGNode *, UpdatePaintNodeData *) override;
 
Q_SIGNALS:
    void textureFollowsItemSizeChanged(bool);
    void mirrorVerticallyChanged(bool);
 
private Q_SLOTS:
    void invalidateSceneGraph();
};
 
QT_END_NAMESPACE
 
#endif // QQUICKFRAMEBUFFEROBJECT_H