File indexing completed on 2024-05-19 05:31:43

 /*
     KWin - the KDE window manager
     This file is part of the KDE project.
 
     SPDX-FileCopyrightText: 2019 David Edmundson <davidedmundson@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #pragma once
 
 #include "kwin_export.h"
 
 #include <QObject>
 #include <QRect>
 #include <QUrl>
 
 #include <memory>
 
 class QKeyEvent;
 class QMouseEvent;
 
 class QMouseEvent;
 class QKeyEvent;
 
 class QQmlContext;
 class QQuickItem;
 class QQuickWindow;
 
 namespace KWin
 {
 class GLTexture;
 
 class OffscreenQuickView;
 
 /**
  * @brief The KwinQuickView class provides a convenient API for exporting
  * QtQuick scenes as buffers that can be composited in any other fashion.
  *
  * Contents can be fetched as a GL Texture or as a QImage
  * If data is to be fetched as an image, it should be specified upfront as
  * blitting is performed when we update our FBO to keep kwin's render loop
  * as fast as possible.
  */
 class KWIN_EXPORT OffscreenQuickView : public QObject
 {
     Q_OBJECT
 
 public:
     enum class ExportMode {
         /** The contents will be available as a texture in the shared contexts. Image will be blank*/
         Texture,
         /** The contents will be blit during the update into a QImage buffer. */
         Image
     };
 
     /**
      * Construct a new KWinQuickView explicitly stating an export mode. \a alpha indicates
      * whether the view is translucent or not.
      */
     explicit OffscreenQuickView(ExportMode exportMode = ExportMode::Texture, bool alpha = true);
 
     /**
      * Note that this may change the current GL Context
      */
     ~OffscreenQuickView();
 
     QSize size() const;
 
     /**
      * The geometry of the current view
      * This may be out of sync with the current buffer size if an update is pending
      */
     void setGeometry(const QRect &rect);
     QRect geometry() const;
 
     void setOpacity(qreal opacity);
     qreal opacity() const;
     bool hasAlphaChannel() const;
 
     /**
      * Render the current scene graph into the FBO.
      * This is typically done automatically when the scene changes
      * albeit deffered by a timer
      *
      * It can be manually invoked to update the contents immediately.
      * Note this will change the GL context
      */
     void update();
 
     /** The invisble root item of the window*/
     QQuickItem *contentItem() const;
     QQuickWindow *window() const;
 
     /**
      * @brief Marks the window as visible/invisible
      * This can be used to release resources used by the window
      * The default is true.
      */
     void setVisible(bool visible);
     bool isVisible() const;
 
     void show();
     void hide();
 
     bool automaticRepaint() const;
     void setAutomaticRepaint(bool set);
 
     /**
      * Returns the current output of the scene graph
      * @note The render context must valid at the time of calling
      */
     GLTexture *bufferAsTexture();
 
     /**
      * Returns the current output of the scene graph
      */
     QImage bufferAsImage() const;
 
     /**
      * Inject any mouse event into the QQuickWindow.
      * Local co-ordinates are transformed
      * If it is handled the event will be accepted
      */
     void forwardMouseEvent(QEvent *mouseEvent);
     /**
      * Inject a key event into the window.
      * If it is handled the event will be accepted
      */
     void forwardKeyEvent(QKeyEvent *keyEvent);
 
     bool forwardTouchDown(qint32 id, const QPointF &pos, std::chrono::microseconds time);
     bool forwardTouchMotion(qint32 id, const QPointF &pos, std::chrono::microseconds time);
     bool forwardTouchUp(qint32 id, std::chrono::microseconds time);
 
 Q_SIGNALS:
     /**
      * The frame buffer has changed, contents need re-rendering on screen
      */
     void repaintNeeded();
     void geometryChanged(const QRect &oldGeometry, const QRect &newGeometry);
     void renderRequested();
     void sceneChanged();
 
 private:
     void handleRenderRequested();
     void handleSceneChanged();
 
     class Private;
     std::unique_ptr<Private> d;
 };
 
 /**
  * The KWinQuickScene class extends KWinQuickView
  * adding QML support. This will represent a context
  * powered by an engine
  */
 class KWIN_EXPORT OffscreenQuickScene : public OffscreenQuickView
 {
 public:
     explicit OffscreenQuickScene(ExportMode exportMode = ExportMode::Texture, bool alpha = true);
     ~OffscreenQuickScene();
 
     /** top level item in the given source*/
     QQuickItem *rootItem() const;
 
     void setSource(const QUrl &source);
     void setSource(const QUrl &source, const QVariantMap &initialProperties);
 
 private:
     class Private;
     std::unique_ptr<Private> d;
 };
 
 }