view.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013-2016 CERN
 * Copyright (C) 2020 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#ifndef __VIEW_H
#define __VIEW_H

#include <vector>
#include <set>
#include <unordered_map>
#include <memory>

#include <math/box2.h>
#include <gal/definitions.h>

#include <view/view_overlay.h>
#include <view/view.h>

class EDA_ITEM;

namespace KIGFX
{
class PAINTER;
class GAL;
class VIEW_ITEM;
class VIEW_GROUP;
class VIEW_RTREE;

class VIEW
{
public:
    friend class VIEW_ITEM;

    typedef std::pair<VIEW_ITEM*, int> LAYER_ITEM_PAIR;

    VIEW( bool aIsDynamic = true );

    virtual ~VIEW();

    static void OnDestroy( VIEW_ITEM* aItem );

    virtual void Add( VIEW_ITEM* aItem, int aDrawPriority = -1 );

    virtual void Remove( VIEW_ITEM* aItem );


    virtual int Query( const BOX2I& aRect, std::vector<LAYER_ITEM_PAIR>& aResult ) const;

    void SetVisible( VIEW_ITEM* aItem, bool aIsVisible = true );

    void Hide( VIEW_ITEM* aItem, bool aHide = true );

    bool IsVisible( const VIEW_ITEM* aItem ) const;

    virtual void Update( const VIEW_ITEM* aItem, int aUpdateFlags ) const;
    virtual void Update( const VIEW_ITEM* aItem ) const;

    void SetRequired( int aLayerId, int aRequiredId, bool aRequired = true );

    void CopySettings( const VIEW* aOtherView );

    /*
     *  Convenience wrappers for adding multiple items
     *  template <class T> void AddItems( const T& aItems );
     *  template <class T> void RemoveItems( const T& aItems );
     */

    void SetGAL( GAL* aGal );

    inline GAL* GetGAL() const
    {
        return m_gal;
    }

    inline void SetPainter( PAINTER* aPainter )
    {
        m_painter = aPainter;
    }

    inline PAINTER* GetPainter() const
    {
        return m_painter;
    }

    void SetViewport( const BOX2D& aViewport );

    BOX2D GetViewport() const;

    void SetMirror( bool aMirrorX, bool aMirrorY );

    bool IsMirroredX() const
    {
        return m_mirrorX;
    }

    bool IsMirroredY() const
    {
        return m_mirrorY;
    }

    virtual void SetScale( double aScale, VECTOR2D aAnchor = { 0, 0 } );

    inline double GetScale() const
    {
        return m_scale;
    }

    inline void SetBoundary( const BOX2D& aBoundary )
    {
        m_boundary = aBoundary;
    }

    inline void SetBoundary( const BOX2I& aBoundary )
    {
        m_boundary.SetOrigin( aBoundary.GetOrigin() );
        m_boundary.SetEnd( aBoundary.GetEnd() );
    }

    inline const BOX2D& GetBoundary() const
    {
        return m_boundary;
    }

    void SetScaleLimits( double aMaximum, double aMinimum )
    {
        wxASSERT_MSG( aMaximum > aMinimum, wxT( "I guess you passed parameters in wrong order" ) );

        m_minScale = aMinimum;
        m_maxScale = aMaximum;
    }

    void SetCenter( const VECTOR2D& aCenter );

    void SetCenter( const VECTOR2D& aCenter, const std::vector<BOX2D>& obscuringScreenRects );

    const VECTOR2D& GetCenter() const
    {
        return m_center;
    }

    VECTOR2D ToWorld( const VECTOR2D& aCoord, bool aAbsolute = true ) const;

    double ToWorld( double aSize ) const;

    VECTOR2D ToScreen( const VECTOR2D& aCoord, bool aAbsolute = true ) const;

    double ToScreen( double aSize ) const;

    const VECTOR2I& GetScreenPixelSize() const;

    void Clear();

    inline void SetLayerVisible( int aLayer, bool aVisible = true )
    {
        wxCHECK( aLayer < (int) m_layers.size(), /*void*/ );

        if( m_layers[aLayer].visible != aVisible )
        {
            // Target has to be redrawn after changing its visibility
            MarkTargetDirty( m_layers[aLayer].target );
            m_layers[aLayer].visible = aVisible;
        }
    }

    inline bool IsLayerVisible( int aLayer ) const
    {
        wxCHECK( aLayer >= 0, false);
        wxCHECK( aLayer < (int) m_layers.size(), false );

        return m_layers.at( aLayer ).visible;
    }

    inline void SetLayerDiff( int aLayer, bool aDiff = true )
    {
        wxCHECK( aLayer < (int) m_layers.size(), /*void*/ );

        if( m_layers[aLayer].diffLayer != aDiff )
        {
            // Target has to be redrawn after changing its layers' diff status
            MarkTargetDirty( m_layers[aLayer].target );
            m_layers[aLayer].diffLayer = aDiff;
        }
    }

    inline void SetLayerHasNegatives( int aLayer, bool aNegatives = true )
    {
        wxCHECK( aLayer < (int) m_layers.size(), /*void*/ );

        if( m_layers[aLayer].hasNegatives != aNegatives )
        {
            // Target has to be redrawn after changing a layers' negatives
            MarkTargetDirty( m_layers[aLayer].target );
            m_layers[aLayer].hasNegatives = aNegatives;
        }
    }

    inline void SetLayerDisplayOnly( int aLayer, bool aDisplayOnly = true )
    {
        wxCHECK( aLayer < (int) m_layers.size(), /*void*/ );
        m_layers[aLayer].displayOnly = aDisplayOnly;
    }

    inline void SetLayerTarget( int aLayer, RENDER_TARGET aTarget )
    {
        wxCHECK( aLayer < (int) m_layers.size(), /*void*/ );
        m_layers[aLayer].target = aTarget;
    }

    void SetLayerOrder( int aLayer, int aRenderingOrder );

    int GetLayerOrder( int aLayer ) const;

    void SortLayers( int aLayers[], int& aCount ) const;

    void ReorderLayerData( std::unordered_map<int, int> aReorderMap );

    void UpdateLayerColor( int aLayer );

    void UpdateAllLayersColor();

    virtual void SetTopLayer( int aLayer, bool aEnabled = true );

    virtual void EnableTopLayer( bool aEnable );

    virtual int GetTopLayer() const;

    void ClearTopLayers();

    void UpdateAllLayersOrder();

    void ClearTargets();

    virtual void Redraw();

    void RecacheAllItems();

    bool IsDynamic() const
    {
        return m_dynamic;
    }

    bool IsDirty() const
    {
        for( int i = 0; i < TARGETS_NUMBER; ++i )
        {
            if( IsTargetDirty( i ) )
                return true;
        }

        return false;
    }

    bool IsTargetDirty( int aTarget ) const
    {
        wxCHECK( aTarget < TARGETS_NUMBER, false );
        return m_dirtyTargets[aTarget];
    }

    inline void MarkTargetDirty( int aTarget )
    {
        wxCHECK( aTarget < TARGETS_NUMBER, /* void */ );
        m_dirtyTargets[aTarget] = true;
    }

    inline bool IsCached( int aLayer ) const
    {
        wxCHECK( aLayer < (int) m_layers.size(), false );

        try
        {
            return m_layers.at( aLayer ).target == TARGET_CACHED;
        }
        catch( const std::out_of_range& )
        {
            return false;
        }
    }

    void MarkDirty()
    {
        for( int i = 0; i < TARGETS_NUMBER; ++i )
            m_dirtyTargets[i] = true;
    }

    void MarkClean()
    {
        for( int i = 0; i < TARGETS_NUMBER; ++i )
            m_dirtyTargets[i] = false;
    }

    void UpdateItems();

    void UpdateAllItems( int aUpdateFlags );

    void UpdateAllItemsConditionally( int aUpdateFlags,
                                      std::function<bool( VIEW_ITEM* )> aCondition );

    bool IsUsingDrawPriority() const
    {
        return m_useDrawPriority;
    }

    void UseDrawPriority( bool aFlag )
    {
        m_useDrawPriority = aFlag;
    }

    void ReverseDrawOrder( bool aFlag )
    {
        m_reverseDrawOrder = aFlag;
    }

    std::shared_ptr<VIEW_OVERLAY> MakeOverlay();

    void InitPreview();

    void ClearPreview();
    void AddToPreview( EDA_ITEM* aItem, bool aTakeOwnership = true );

    void ShowPreview( bool aShow = true );

    std::unique_ptr<VIEW> DataReference() const;

    static constexpr int VIEW_MAX_LAYERS = 512;  

protected:
    struct VIEW_LAYER
    {
        bool                    visible;         
        bool                    displayOnly;     
        bool                    diffLayer;       
        bool                    hasNegatives;    
        std::shared_ptr<VIEW_RTREE> items;       
        int                     renderingOrder;  
        int                     id;              
        RENDER_TARGET           target;          
        std::set<int>           requiredLayers;  
    };



    VIEW( const VIEW& ) = delete;

    void redrawRect( const BOX2I& aRect );

    inline void markTargetClean( int aTarget )
    {
        wxCHECK( aTarget < TARGETS_NUMBER, /* void */ );
        m_dirtyTargets[aTarget] = false;
    }

    void draw( VIEW_ITEM* aItem, int aLayer, bool aImmediate = false );

    void draw( VIEW_ITEM* aItem, bool aImmediate = false );

    void draw( VIEW_GROUP* aGroup, bool aImmediate = false );

    void sortLayers();

    void clearGroupCache();

    void invalidateItem( VIEW_ITEM* aItem, int aUpdateFlags );

    void updateItemColor( VIEW_ITEM* aItem, int aLayer );

    void updateItemGeometry( VIEW_ITEM* aItem, int aLayer );

    void updateBbox( VIEW_ITEM* aItem );

    void updateLayers( VIEW_ITEM* aItem );

    static bool compareRenderingOrder( VIEW_LAYER* aI, VIEW_LAYER* aJ )
    {
        return aI->renderingOrder > aJ->renderingOrder;
    }

    bool areRequiredLayersEnabled( int aLayerId ) const;

    // Function objects that need to access VIEW/VIEW_ITEM private/protected members
    struct CLEAR_LAYER_CACHE_VISITOR;
    struct RECACHE_ITEM_VISITOR;
    struct DRAW_ITEM_VISITOR;
    struct UPDATE_COLOR_VISITOR;
    struct UPDATE_DEPTH_VISITOR;

    std::unique_ptr<KIGFX::VIEW_GROUP> m_preview;
    std::vector<EDA_ITEM *>            m_ownedItems;

    bool                               m_enableOrderModifier;

    std::vector<VIEW_LAYER>            m_layers;

    std::vector<VIEW_LAYER*>           m_orderedLayers;

    std::shared_ptr<std::vector<VIEW_ITEM*>> m_allItems;

    std::set<unsigned int>             m_topLayers;

    VECTOR2D                           m_center;

    double                             m_scale;
    BOX2D                              m_boundary;
    double                             m_minScale;
    double                             m_maxScale;

    bool                               m_mirrorX;
    bool                               m_mirrorY;

    PAINTER* m_painter;

    GAL* m_gal;

    bool m_dynamic;

    bool m_dirtyTargets[TARGETS_NUMBER];

    static const int TOP_LAYER_MODIFIER;

    bool m_useDrawPriority;

    int m_nextDrawPriority;

    bool m_reverseDrawOrder;
};
} // namespace KIGFX

#endif