File indexing completed on 2024-05-19 04:26:23

 /*
  *  SPDX-FileCopyrightText: 2007 Boudewijn Rempt <boud@valdyas.org>
  *
  *  SPDX-License-Identifier: GPL-2.0-or-later
  */
 #ifndef _KIS_NODE_H
 #define _KIS_NODE_H
 
 #include "kis_types.h"
 
 #include "kis_base_node.h"
 
 #include "kritaimage_export.h"
 
 #include <QVector>
 #include <KisRegion.h>
 
 class QRect;
 class QStringList;
 
 class KoProperties;
 
 class KisNodeVisitor;
 class KisNodeGraphListener;
 class KisNodeProgressProxy;
 class KisBusyProgressIndicator;
 class KisAbstractProjectionPlane;
 class KisProjectionLeaf;
 class KisKeyframeChannel;
 class KisTimeSpan;
 class KisUndoAdapter;
 struct KisFrameChangeUpdateRecipe;
 
 /**
  * A KisNode is a KisBaseNode that knows about its direct peers, parent
  * and children and whether it can have children.
  *
  * THREAD-SAFETY: All const methods of this class and setDirty calls
  *                are considered to be thread-safe(!). All the others
  *                especially add(), remove() and setParent() must be
  *                protected externally.
  *
  * NOTE: your subclasses must have the Q_OBJECT declaration, even if
  * you do not define new signals or slots.
  */
 class KRITAIMAGE_EXPORT KisNode : public KisBaseNode
 {
     friend class KisFilterMaskTest;
     Q_OBJECT
 
 public:
     /**
      * The struct describing the position of the node
      * against the filthy node.
      * NOTE: please change KisBaseRectsWalker::getPositionToFilthy
      *       when changing this struct
      */
     enum PositionToFilthy {
         N_ABOVE_FILTHY = 0x08,
         N_FILTHY_PROJECTION = 0x20,
         N_FILTHY = 0x40,
         N_BELOW_FILTHY = 0x80
     };
 
     /**
      * Create an empty node without a parent.
      */
     KisNode(KisImageWSP image);
 
     /**
      * Create a copy of this node. The copy will not have a parent
      * node.
      */
     KisNode(const KisNode & rhs);
 
     /**
      * Delete this node
      */
     ~KisNode() override;
 
     virtual KisNodeSP clone() const = 0;
 
     bool accept(KisNodeVisitor &v) override;
     void accept(KisProcessingVisitor &visitor, KisUndoAdapter *undoAdapter) override;
 
     /**
      * Re-implement this method to add constraints for the
      * subclasses that can be added as children to this node
      *
      * @return false if the given node is not allowed as a child to this node
      */
     virtual bool allowAsChild(KisNodeSP) const = 0;
 
     /**
      * Set the entire node extent dirty; this percolates up to parent
      * nodes all the way to the root node. By default this is the
      * empty rect (through KisBaseNode::extent())
      */
     virtual void setDirty();
 
     /**
      * Add the given rect to the set of dirty rects for this node;
      * this percolates up to parent nodes all the way to the root
      * node.
      */
     void setDirty(const QRect & rect);
 
     /**
      * Add the given rects to the set of dirty rects for this node;
      * this percolates up to parent nodes all the way to the root
      * node.
      */
     virtual void setDirty(const QVector<QRect> &rects);
 
     /**
      * Add the given region to the set of dirty rects for this node;
      * this percolates up to parent nodes all the way to the root
      * node, if propagate is true;
      */
     void setDirty(const KisRegion &region);
 
     /**
      * Convenience override of multirect version of setDirtyDontResetAnimationCache()
      *
      * @see setDirtyDontResetAnimationCache(const QVector<QRect> &rects)
      */
     void setDirtyDontResetAnimationCache();
 
     /**
      * Convenience override of multirect version of setDirtyDontResetAnimationCache()
      *
      * @see setDirtyDontResetAnimationCache(const QVector<QRect> &rects)
      */
     void setDirtyDontResetAnimationCache(const QRect &rect);
 
     /**
      * @brief setDirtyDontResetAnimationCache does almost the same thing as usual
      * setDirty() call, but doesn't reset the animation cache (since onion skins are
      * not used when rendering animation.
      */
     void setDirtyDontResetAnimationCache(const QVector<QRect> &rects);
 
     /**
      * Informs animation cache that the frames in the given range are
      * no longer valid and need to be recached.
      * @param range frames to invalidate
      */
     void invalidateFrames(const KisTimeSpan &range, const QRect &rect);
 
     virtual void handleKeyframeChannelFrameChange(const KisKeyframeChannel *channel, int time);
     virtual void handleKeyframeChannelFrameAdded(const KisKeyframeChannel *channel, int time);
     void handleKeyframeChannelFrameAboutToBeRemoved(const KisKeyframeChannel *channel, int time);
     void handleKeyframeChannelFrameHasBeenRemoved(const KisKeyframeChannel *channel, int time);
 
     /**
      * Informs that the current world time should be changed.
      * Might be caused by e.g. undo operation
      */
     void requestTimeSwitch(int time);
 
     /**
      * \return a pointer to a KisAbstractProjectionPlane interface of
      *         the node. This interface is used by the image merging
      *         framework to get information and to blending for the
      *         layer.
      *
      * Please note the difference between need/change/accessRect and
      * the projectionPlane() interface. The former one gives
      * information about internal composition of the layer, and the
      * latter one about the total composition, including layer styles,
      * pass-through blending and etc.
      */
     virtual KisAbstractProjectionPlaneSP projectionPlane() const;
 
     /**
      * Synchronizes LoD caches of the node with the current state of it.
      * The current level of detail is fetched from the image pointed by
      * default bounds object
      */
     virtual void syncLodCache();
     virtual KisPaintDeviceList getLodCapableDevices() const;
 
     /**
      * The rendering of the image may not always happen in the order
      * of the main graph. Pass-through nodes make some subgraphs
      * linear, so it the order of rendering change. projectionLeaf()
      * is a special interface of KisNode that represents "a graph for
      * projection rendering". Therefore the nodes in projectionLeaf()
      * graph may have a different order the main one.
      */
     virtual KisProjectionLeafSP projectionLeaf() const;
 
 
     void setImage(KisImageWSP newImage) override;
 
 protected:
 
     /**
      * \return internal changeRect() of the node. Do not mix with \see
      *         projectionPlane()
      *
      * Some filters will cause a change of pixels those are outside
      * a requested rect. E.g. we change a rect of 2x2, then we want to
      * apply a convolution filter with kernel 4x4 (changeRect is
      * (2+2*3)x(2+2*3)=8x8) to that area. The rect that should be updated
      * on the layer will be exactly 8x8. More than that the needRect for
      * that update will be 14x14. See \ref needRect.
      */
     virtual QRect changeRect(const QRect &rect, PositionToFilthy pos = N_FILTHY) const;
 
     /**
      * \return internal needRect() of the node. Do not mix with \see
      *         projectionPlane()
      *
      * Some filters need pixels outside the current processing rect to
      * compute the new value (for instance, convolution filters)
      * See \ref changeRect
      * See \ref accessRect
      */
     virtual QRect needRect(const QRect &rect, PositionToFilthy pos = N_FILTHY) const;
 
 
     /**
      * \return internal accessRect() of the node. Do not mix with \see
      *         projectionPlane()
      *
      * Shows the area of image, that may be accessed during accessing
      * the node.
      *
      * Example. You have a layer that needs to prepare some rect on a
      * projection, say expectedRect. To perform this, the projection
      * of all the layers below of the size needRect(expectedRect)
      * should be calculated by the merger beforehand and the layer
      * will access some other area of image inside the rect
      * accessRect(expectedRect) during updateProjection call.
      *
      * This knowledge about real access rect of a node is used by the
      * scheduler to avoid collisions between two multithreaded updaters
      * and so avoid flickering of the image.
      *
      * Currently, this method has nondefault value for shifted clone
      * layers only.
      */
     virtual QRect accessRect(const QRect &rect, PositionToFilthy pos = N_FILTHY) const;
 
     /**
      * Called each time direct child nodes are added or removed under this
      * node as parent. This does not track changes inside the child nodes
      * or the child nodes' properties.
      */
     virtual void childNodeChanged(KisNodeSP changedChildNode);
 
 public: // Graph methods
 
     /**
      * @return the graph sequence number calculated by the associated
      * graph listener. You can use it for checking for changes in the
      * graph.
      */
     int graphSequenceNumber() const;
 
     /**
      * @return the graph listener this node belongs to. 0 if the node
      * does not belong to a graph listener.
      */
     KisNodeGraphListener * graphListener() const;
 
     /**
      * Set the graph listener for this node. The graphlistener will be
      * informed before and after the list of child nodes has changed.
      */
     void setGraphListener(KisNodeGraphListener * graphListener);
 
     /**
      * Returns the parent node of this node. This is 0 only for a root
      * node; otherwise this will be an actual Node
      */
     KisNodeSP parent() const;
 
     /**
      * Returns the first child node of this node, or 0 if there are no
      * child nodes.
      */
     KisNodeSP firstChild() const;
 
     /**
      * Returns the last child node of this node, or 0 if there are no
      * child nodes.
      */
     KisNodeSP lastChild() const;
 
     /**
      * Returns the previous sibling of this node in the parent's list.
      * This is the node *above* this node in the composition stack. 0
      * is returned if this child has no more previous siblings (==
      * firstChild())
      */
     KisNodeSP prevSibling() const;
 
     /**
      * Returns the next sibling of this node in the parent's list.
      * This is the node *below* this node in the composition stack. 0
      * is returned if this child has no more next siblings (==
      * lastChild())
      */
     KisNodeSP nextSibling() const;
 
     /**
      * Returns how many direct child nodes this node has (not
      * recursive).
      */
     quint32 childCount() const;
 
     /**
      * Retrieve the child node at the specified index.
      *
      * @return 0 if there is no node at this index.
      */
     KisNodeSP at(quint32 index) const;
 
     /**
      * Retrieve the index of the specified child node.
      *
      * @return -1 if the specified node is not a child node of this
      * node.
      */
     int index(const KisNodeSP node) const;
 
 
     /**
      * Return a list of child nodes of the current node that conform
      * to the specified constraints. There are no guarantees about the
      * order of the nodes in the list. The function is not recursive.
      *
      * @param nodeTypes. if not empty, only nodes that inherit the
      * classnames in this stringlist will be returned.
      * @param properties. if not empty, only nodes for which
      * KisNodeBase::check(properties) returns true will be returned.
      */
     QList<KisNodeSP> childNodes(const QStringList & nodeTypes, const KoProperties & properties) const;
 
 Q_SIGNALS:
     /**
      * Don't use this signal anywhere other than KisNodeShape. It's a hack.
      */
     void sigNodeChangedInternal();
 
 public:
 
     /**
      * @return the node progress proxy used by this node, if this node has no progress
      *         proxy, it will return the proxy of its parent, if the parent has no progress proxy
      *         it will return 0
      */
     KisNodeProgressProxy* nodeProgressProxy() const;
 
     KisBusyProgressIndicator* busyProgressIndicator() const;
 
 private:
 
     /**
      * Create a node progress proxy for this node. You need to create a progress proxy only
      * if the node is going to appear in the layerbox, and it needs to be created before
      * the layer box is made aware of the proxy.
      */
     void createNodeProgressProxy();
 
 protected:
     KisBaseNodeSP parentCallback() const override;
     void notifyParentVisibilityChanged(bool value) override;
     void baseNodeChangedCallback() override;
     void baseNodeInvalidateAllFramesCallback() override;
     void baseNodeCollapsedChangedCallback() override;
 
 protected:
     void addKeyframeChannel(KisKeyframeChannel* channel) override;
     virtual KisFrameChangeUpdateRecipe handleKeyframeChannelFrameAboutToBeRemovedImpl(const KisKeyframeChannel *channel, int time);
 
 private:
 
     friend class KisNodeFacade;
     friend class KisNodeTest;
     friend class KisLayer; // Note: only for setting the preview mask!
     /**
      * Set the parent of this node.
      */
     void setParent(KisNodeWSP parent);
 
     /**
      * Add the specified node above the specified node. If aboveThis
      * is 0, the node is added at the bottom.
      */
     bool add(KisNodeSP newNode, KisNodeSP aboveThis);
 
     /**
      * Removes the node at the specified index from the child nodes.
      *
      * @return false if there is no node at this index
      */
     bool remove(quint32 index);
 
     /**
      * Removes the node from the child nodes.
      *
      * @return false if there's no such node in this node.
      */
     bool remove(KisNodeSP node);
 
     KisNodeSP prevChildImpl(KisNodeSP child);
     KisNodeSP nextChildImpl(KisNodeSP child);
 
 private:
 
     struct Private;
     Private * const m_d;
 
 };
 
 Q_DECLARE_METATYPE(KisNodeSP)
 
 Q_DECLARE_METATYPE(KisNodeWSP)
 
 #endif