/*
  Copyright 2008        Brad Hards  <bradh@frogmouth.net>
  Copyright 2009 - 2010 Inge Wallin <inge@lysator.liu.se>

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either 
  version 2.1 of the License, or (at your option) any later version.
  
  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public 
  License along with this library.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef EMFOUTPUTPAINTERSTRATEGY_H
#define EMFOUTPUTPAINTERSTRATEGY_H

#include "kovectorimage_export.h"

#include <QList>
#include <QPainter>
#include <QRect> // also provides QSize, QPoint
#include <QString>
#include <QVariant>

#include "EmfEnums.h"
#include "EmfHeader.h"
#include "EmfRecords.h"
#include "EmfOutput.h"


/**
   \file

   Primary definitions for EMF output strategies
*/

/**
   Namespace for Enhanced Metafile (EMF) classes
*/
namespace Libemf
{

class EmrTextObject;

/**
    QPainter based output strategy for EMF Parser.

    This class allows rendering of an EMF file to a QPixmap or any other QPaintDevice.
*/
class KOVECTORIMAGE_EXPORT OutputPainterStrategy : public AbstractOutput
{
public:
    /**
       Constructor.

       This will probably need to take an enum to say what sort of output
       we want.
    */
    OutputPainterStrategy();
    OutputPainterStrategy( QPainter &painter, QSize &size, 
                           bool keepAspectRatio = false );
    ~OutputPainterStrategy() override;

    void init( const Header *header ) override;
    void cleanup( const Header *header ) override;
    void eof() override;

    /**
       The image that has been rendered to.
    */
    QImage *image();

    void createPen( quint32 ihPen, quint32 penStyle, quint32 x, quint32 y,
		    quint8 red, quint8 green, quint8 blue, quint8 reserved ) override;
    void createBrushIndirect( quint32 ihBrush, quint32 BrushStyle, quint8 red,
			      quint8 green, quint8 blue, quint8 reserved, 
			      quint32 BrushHatch ) override;
    void createMonoBrush( quint32 ihBrush, Bitmap *bitmap ) override;
    void selectObject( const quint32 ihObject ) override;
    void deleteObject( const quint32 ihObject ) override;
    void arc( const QRect &box, const QPoint &start, const QPoint &end ) override;
    void chord( const QRect &box, const QPoint &start, const QPoint &end ) override;
    void pie( const QRect &box, const QPoint &start, const QPoint &end ) override;
    void ellipse( const QRect &box ) override;
    void rectangle( const QRect &box ) override;
    void setMapMode( const quint32 mapMode ) override;
    void setMetaRgn() override;
    void setWindowOrgEx( const QPoint &origin ) override;
    void setWindowExtEx( const QSize &size ) override;
    void setViewportOrgEx( const QPoint &origin ) override;
    void setViewportExtEx( const QSize &size ) override;
    void beginPath() override;
    void closeFigure() override;
    void endPath() override;
    void setBkMode( const quint32 backgroundMode ) override;
    void setPolyFillMode( const quint32 polyFillMode ) override;
    void setLayout( const quint32 layoutMode ) override;
    void extCreateFontIndirectW( const ExtCreateFontIndirectWRecord &extCreateFontIndirectW ) override;
    void setTextAlign( const quint32 textAlignMode ) override;
    void setTextColor( const quint8 red, const quint8 green, const quint8 blue,
		       const quint8 reserved ) override;
    void setBkColor( const quint8 red, const quint8 green, const quint8 blue,
                     const quint8 reserved ) override;
    void setPixelV( QPoint &point, quint8 red, quint8 green, quint8 blue, quint8 reserved ) override;
    void modifyWorldTransform( quint32 mode, float M11, float M12,
			       float M21, float M22, float Dx, float Dy ) override;
    void setWorldTransform( float M11, float M12, float M21,
			    float M22, float Dx, float Dy ) override;
    void extTextOut( const QRect &bounds, const EmrTextObject &textObject ) override;
    void moveToEx( const qint32 x, const qint32 y ) override;
    void saveDC() override;
    void restoreDC( const qint32 savedDC ) override;
    void lineTo( const QPoint &finishPoint ) override;
    void arcTo( const QRect &box, const QPoint &start, const QPoint &end ) override;
    void polygon16( const QRect &bounds, const QList<QPoint> points ) override;
    void polyLine16( const QRect &bounds, const QList<QPoint> points ) override;
    void polyPolygon16( const QRect &bounds, const QList< QVector< QPoint > > &points ) override;
    void polyPolyLine16( const QRect &bounds, const QList< QVector< QPoint > > &points ) override;
    void polyLine( const QRect &bounds, const QList<QPoint> points ) override;
    void polyLineTo16( const QRect &bounds, const QList<QPoint> points ) override;
    void polyBezier16( const QRect &bounds, const QList<QPoint> points ) override;
    void polyBezierTo16( const QRect &bounds, const QList<QPoint> points ) override;
    void fillPath( const QRect &bounds ) override;
    void strokeAndFillPath( const QRect &bounds ) override;
    void strokePath( const QRect &bounds ) override;
    void setClipPath( const quint32 regionMode ) override;
    void bitBlt( BitBltRecord &bitBltRecord ) override;
    void setStretchBltMode( const quint32 stretchMode ) override;
    void stretchDiBits( StretchDiBitsRecord &stretchDiBitsRecord ) override;

private:
    void printPainterTransform(const char *leadText);

    /// For debugging purposes: Draw the boundary box.
    void paintBounds(const Header *header);

    /// Recalculate the world transform and then apply it to the painter
    /// This must be called at the end of every function that changes the transform.
    void recalculateWorldTransform();

    /**
       Select a stock object.

       See [MS-EMF] Section 2.1.31.

       \param ihObject the stock object value
    */
    void selectStockObject( const quint32 ihObject );


    /**
       Helper routine to convert the EMF angle (centrepoint + radial endpoint) into
       the Qt format (in degress - may need to multiply by 16 for some purposes)
    */
    qreal angleFromArc( const QPoint &centrePoint, const QPoint &radialPoint );

    /**
      Calculate the angular difference (span) between two angles
      
      This should always be positive.
    */
    qreal angularSpan( const qreal startAngle, const qreal endAngle );

    /**
       Convert the EMF font weight scale (0..1000) to Qt equivalent.
       
       This is a bit rough - the EMF spec only says 400 is normal, and 
       700 is bold.
    */
    int convertFontWeight( quint32 emfWeight );


    Header                  *m_header;   // Save to be able to retain scaling.

    int                      m_painterSaves; // The number of times that save() was called.
    QSize                    m_outputSize;
    bool                     m_keepAspectRatio;

    QMap<quint32, QVariant>  m_objectTable;

    QPainterPath *m_path;
    bool          m_currentlyBuildingPath;

    QPainter                *m_painter;
    QTransform               m_worldTransform; // The transform inside the EMF.
    QTransform               m_outputTransform; // The transform that the painter already had
    qreal                    m_outputScale;

    // Everything that has to do with window and viewport calculation
    QPoint        m_windowOrg;
    QSize         m_windowExt;
    QPoint        m_viewportOrg;
    QSize         m_viewportExt;
    bool          m_windowExtIsSet;
    bool          m_viewportExtIsSet;
    bool          m_windowViewportIsSet;

#if 0
    // This matrix is needed because the window / viewport calculation
    // is not the last one in the chain. After that one comes the
    // transform that the painter already has when the painting
    // starts, and that one has to be saved and reapplied again after
    // the window / viewport calculation is redone.
    QTransform    m_outputTransform;
#endif

    // ----------------------------------------------------------------
    //                     The playback device context

    // The Playback Device Context (PDC) contains the following:
    //  - bitmap
    //  - brush	(part of the painter)
    //  - palette
    //  - font	(part of the painter)
    //  - pen	(part of the painter)
    //  - region
    //  - drawing mode
    //  - mapping mode
    // FIXME: what more?  textalign?  textpen?

    /**
       The current text pen
    */
    QPen m_textPen;

    /**
       The current fill rule
    */
    enum Qt::FillRule m_fillRule;

    /**
       The current map mode
    */
    MapMode  m_mapMode;
    /**
        The current text alignment mode
    */
    quint32 m_textAlignMode;

    /**
       The current coordinates
    */
    QPoint  m_currentCoords;
};

}

#endif
