painterwindow.h - mozsearch

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// Copyright (C) 2025 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

#ifndef PAINTERWINDOW_H

#define PAINTERWINDOW_H

#include <QColor>

#include <QWindow>

#if QT_CONFIG(opengl)

#  include <QOffscreenSurface>

#endif

#include <rhi/qrhi.h>

QT_FORWARD_DECLARE_CLASS(QCanvasPainter)

QT_FORWARD_DECLARE_CLASS(QCanvasPainterFactory)

class PainterWindow : public QWindow

    Q_OBJECT

public:

    PainterWindow(QRhi::Implementation api);

    ~PainterWindow() override;

    QColor fillColor() const;

    void setFillColor(const QColor &color);

protected:

    virtual void paint(QCanvasPainter *painter);

    virtual void cleanup();

    void exposeEvent(QExposeEvent *) override;

    bool event(QEvent *) override;

private:

    void updateSurfaceType();

    void releaseSwapChain();

    void init();

    void resizeSwapChain();

    void render();

    QColor m_fillColor = { 0, 0, 0, 0 };

    QCanvasPainterFactory *m_factory = nullptr;

    QRhi::Implementation m_graphicsApi = QRhi::Null;

#if QT_CONFIG(opengl)

    std::unique_ptr<QOffscreenSurface> m_fallbackSurface;

#endif

    std::unique_ptr<QRhi> m_rhi;

    std::unique_ptr<QRhiSwapChain> m_sc;

    std::unique_ptr<QRhiRenderBuffer> m_ds;

    std::unique_ptr<QRhiRenderPassDescriptor> m_rp;

    bool m_hasSwapChain = false;

    bool m_running = false;

    bool m_notExposed = false;

    bool m_newlyExposed = false;

};

#endif // PAINTERWINDOW_H