File indexing completed on 2024-05-12 16:01:45

 /*
  *  SPDX-FileCopyrightText: 2017 Dmitry Kazakov <dimula73@gmail.com>
  *
  *  SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #ifndef KISASYNCANIMATIONRENDERERBASE_H
 #define KISASYNCANIMATIONRENDERERBASE_H
 
 #include <QObject>
 #include "kis_types.h"
 
 #include "kritaui_export.h"
 
 class KisRegion;
 
 /**
  * KisAsyncAnimationRendererBase is a special class representing a
  * single worker thread inside KisAsyncAnimationRenderDialogBase. It connects
  * the specified image using correct Qt::DirectConnection connections and
  * reacts on them. On sigFrameReady() signal it calls frameCompletedCallback(),
  * so the derived class can fetch a frame from the image and process it. On
  * sigFrameCancelled() it calls frameCancelledCallback(). The derived class
  * should override these two methods to do the actual work.
  */
 
 class KRITAUI_EXPORT KisAsyncAnimationRendererBase : public QObject
 {
     Q_OBJECT
 
 public:
     enum Flag
     {
         None = 0x0,
         Cancellable = 0x1
     };
     Q_DECLARE_FLAGS(Flags, Flag)
 
     enum CancelReason {
         UserCancelled = 0,
         RenderingFailed,
         RenderingTimedOut
     };
     Q_ENUM(CancelReason)
 
 public:
     explicit KisAsyncAnimationRendererBase(QObject *parent = 0);
     virtual ~KisAsyncAnimationRendererBase();
 
     /**
      * Initiates the rendering of the frame \p frame on an image \p image.
      * Only \p regionOfInterest is regenerated. If \p regionOfInterest is
      * empty, then entire bounds of the image is regenerated.
      */
     void startFrameRegeneration(KisImageSP image, int frame, const KisRegion &regionOfInterest, Flags flags = None);
 
     /**
      * Convenience overload that regenerates the full image
      */
     void startFrameRegeneration(KisImageSP image, int frame, Flags flags = None);
 
     /**
      * @return true if the regeneration process is in progress
      */
     bool isActive() const;
 
 public Q_SLOTS:
     /**
      * @brief cancels current rendering operation
      *
      * After calling this slot requestedImage() becomes invalid.
      * @see requestedImage()
      */
     void cancelCurrentFrameRendering(CancelReason cancelReason);
 
 Q_SIGNALS:
     void sigFrameCompleted(int frame);
     void sigFrameCancelled(int frame, KisAsyncAnimationRendererBase::CancelReason cancelReason);
 
 private Q_SLOTS:
     void slotFrameRegenerationCancelled();
     void slotFrameRegenerationTimedOut();
     void slotFrameRegenerationFinished(int frame);
 
 protected Q_SLOTS:
     /**
      * Called by a derived class to continue processing of the frames
      */
     void notifyFrameCompleted(int frame);
 
     /**
      * Called by a derived class to cancel processing of the frames. After calling
      * this method, the dialog will stop processing the frames and close.
      */
     void notifyFrameCancelled(int frame, KisAsyncAnimationRendererBase::CancelReason cancelReason);
 
 protected:
     /**
      * @brief frameCompletedCallback is called by the renderer when
      *        a new frame becomes ready
      *
      * NOTE1: the callback is called from the context of a image
      *        worker thread! So it is asynchronous from the GUI thread.
      * NOTE2: in case of successful processing of the frame, the callback
      *        must issue some signal, connected to notifyFrameCompleted()
      *        via auto connection, to continue processing. Please do not
      *        call the method directly, because notifyFame*() slots should
      *        be called from the context of the GUI thread.
      * NOTE3: In case of failure, notifyFrameCancelled(). The same threading
      *        rules apply.
      */
     virtual void frameCompletedCallback(int frame, const KisRegion &requestedRegion) = 0;
 
     /**
      * @brief frameCancelledCallback is called when the rendering of
      *        the frame was cancelled.
      *
      * The rendering of the frame can be either cancelled by the image itself or
      * by receiving a timeout signal (10 seconds).
      *
      * NOTE: the slot is called in the GUI thread. Don't forget to call
      *       notifyFrameCancelled() in he end of your call.
      */
     virtual void frameCancelledCallback(int frame, CancelReason cancelReason) = 0;
 
 
     /**
      * Called by KisAsyncAnimationRendererBase when the processing has been completed
      * and the internal state of the populator should be cleared
      *
      * @param isCancelled tells if frame regeneration has failed to be regenerated
      */
     virtual void clearFrameRegenerationState(bool isCancelled);
 
 protected:
     /**
      * @return the image that for which the rendering was requested using
      * startFrameRegeneration(). Should be used by the derived classes only.
      *
      * Please note that requestedImage() will become null as soon as the user
      * cancels the processing. That happens in the GUI thread so
      * frameCompletedCallback() should be extremely careful when requesting the
      * value (check the shared pointer after fetching).
      */
     KisImageSP requestedImage() const;
 
 private:
     struct Private;
     const QScopedPointer<Private> m_d;
 };
 
 Q_DECLARE_OPERATORS_FOR_FLAGS(KisAsyncAnimationRendererBase::Flags)
 
 #endif // KISASYNCANIMATIONRENDERERBASE_H