qt-everywhere-src-5.15.1/qtwebengine/src/core/compositor/delegated_frame_node.h

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#ifndef DELEGATED_FRAME_NODE_H
#define DELEGATED_FRAME_NODE_H

#include "base/containers/circular_deque.h"
#include "components/viz/common/quads/compositor_frame.h"
#include "components/viz/common/quads/render_pass.h"

#include <QtCore/QSharedPointer>
#include <QtGui/QOffscreenSurface>
#include <QtQuick/QSGTransformNode>

#include "chromium_gpu_helper.h"
#include "render_widget_host_view_qt_delegate.h"

QT_BEGIN_NAMESPACE
class QSGLayer;
QT_END_NAMESPACE

namespace gfx {
class QuadF;
}

namespace viz {
class DelegatedFrameData;
class DrawQuad;
class DrawPolygon;
}

namespace QtWebEngineCore {

class CompositorResource;
class CompositorResourceTracker;
class DelegatedNodeTreeHandler;
class MailboxTexture;

class DelegatedFrameNode : public QSGTransformNode {
public:
    DelegatedFrameNode();
    ~DelegatedFrameNode();
    void preprocess() override;
    void commit(const viz::CompositorFrame &pendingFrame, const viz::CompositorFrame &committedFrame, const CompositorResourceTracker *resourceTracker, RenderWidgetHostViewQtDelegate *apiDelegate);

private:
    void flushPolygons(base::circular_deque<std::unique_ptr<viz::DrawPolygon> > *polygonQueue,
        QSGNode *renderPassChain,
        DelegatedNodeTreeHandler *nodeHandler,
        const CompositorResourceTracker *resourceTracker,
        RenderWidgetHostViewQtDelegate *apiDelegate);
    void handlePolygon(
        const viz::DrawPolygon *polygon,
        QSGNode *currentLayerChain,
        DelegatedNodeTreeHandler *nodeHandler,
        const CompositorResourceTracker *resourceTracker,
        RenderWidgetHostViewQtDelegate *apiDelegate);
    void handleClippedQuad(
        const viz::DrawQuad *quad,
        const gfx::QuadF &clipRegion,
        QSGNode *currentLayerChain,
        DelegatedNodeTreeHandler *nodeHandler,
        const CompositorResourceTracker *resourceTracker,
        RenderWidgetHostViewQtDelegate *apiDelegate);
    void handleQuad(
        const viz::DrawQuad *quad,
        QSGNode *currentLayerChain,
        DelegatedNodeTreeHandler *nodeHandler,
        const CompositorResourceTracker *resourceTracker,
        RenderWidgetHostViewQtDelegate *apiDelegate);

    const CompositorResource *findAndHoldResource(unsigned resourceId, const CompositorResourceTracker *resourceTracker);
    void holdResources(const viz::DrawQuad *quad, const CompositorResourceTracker *resourceTracker);
    void holdResources(const viz::RenderPass *pass, const CompositorResourceTracker *resourceTracker);
    QSGTexture *initAndHoldTexture(const CompositorResource *resource, bool hasAlphaChannel, RenderWidgetHostViewQtDelegate *apiDelegate = 0, int target = -1);
    QSharedPointer<QSGTexture> createBitmapTexture(const CompositorResource *resource, bool hasAlphaChannel, RenderWidgetHostViewQtDelegate *apiDelegate);
    QSharedPointer<MailboxTexture> createMailboxTexture(const CompositorResource *resource, bool hasAlphaChannel, int target);

    void copyMailboxTextures();

    struct SGObjects {
        QVector<QPair<int, QSharedPointer<QSGLayer> > > renderPassLayers;
        QVector<QSharedPointer<QSGRootNode> > renderPassRootNodes;
        QHash<unsigned, QSharedPointer<QSGTexture> > bitmapTextures;
        QHash<unsigned, QSharedPointer<MailboxTexture> > mailboxTextures;
    } m_sgObjects, m_previousSGObjects;
    QVector<QSGNode*> m_sceneGraphNodes;
#if defined(USE_OZONE)
    bool m_contextShared;
    QScopedPointer<QOffscreenSurface> m_offsurface;
#endif
    QSize m_previousViewportSize;
};

} // namespace QtWebEngineCore

#endif // DELEGATED_FRAME_NODE_H