QGCOffscreenRenderer.h

Go to the documentation of this file.

#pragma once
 
#include <QtCore/QObject>
#include <QtCore/QSize>
#include <QtCore/QUrl>
#include <QtGui/QImage>
#include <memory>
 
class QQmlEngine;
class QQmlComponent;
class QQuickItem;
class QQuickWindow;
class QQuickRenderControl;
class QRhi;
class QRhiTexture;
class QRhiRenderBuffer;
class QRhiTextureRenderTarget;
class QRhiRenderPassDescriptor;
 
class QGCOffscreenRenderer : public QObject
{
    Q_OBJECT
 
public:
    explicit QGCOffscreenRenderer(QObject* parent = nullptr);
    ~QGCOffscreenRenderer() override;
 
    bool load(const QUrl& qmlSource, const QSize& pixelSize);
 
    QImage renderToImage();
 
    bool isValid() const { return _initialized; }
 
private:
    void releaseRhiResources();
    bool ensureRhiTarget();
 
    std::unique_ptr<QQuickRenderControl> _renderControl;
    std::unique_ptr<QQuickWindow> _quickWindow;
    std::unique_ptr<QQmlEngine> _qmlEngine;
    std::unique_ptr<QQmlComponent> _qmlComponent;
    QQuickItem* _rootItem = nullptr;
 
    QRhi* _rhi = nullptr;
    std::unique_ptr<QRhiTexture> _texture;
    std::unique_ptr<QRhiRenderBuffer> _depthStencil;
    std::unique_ptr<QRhiTextureRenderTarget> _renderTarget;
    std::unique_ptr<QRhiRenderPassDescriptor> _rpDesc;
 
    QSize _pixelSize;
    bool _initialized = false;
};