tdegraphics/libkscan/img_canvas.cpp

/* This file is part of the KDE Project
   Copyright (C) 1999 Klaas Freitag <freitag@suse.de>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

#include <tqapplication.h>
#include <tqfiledialog.h>
#include <tqstring.h>
#include <tqmessagebox.h>
#include <tqscrollview.h>
#include <kpopupmenu.h>
#include <tqlabel.h>
#include <tqdict.h>
#include <tqimage.h>
#include <tqpainter.h>

#include <klocale.h>
#include <kstyle.h>
#include <kapplication.h>

#include <kpixmapio.h>
#include <kdebug.h>
#include <kiconloader.h>
#include <kcmenumngr.h>
#include <tqpixmap.h>

#define __IMG_CANVAS_CPP__

#include "imgscaledialog.h"
#include "img_canvas.h"



#define MIN(x,y) (x<y?x:y)


inline void debug_rect( const char *name, TQRect *r )
{
	kdDebug(29000) << (name ? name: "NONAME") << ": " << r->x() << ", " << r->y() << ", " << r->width() << ", " << r->height() << endl;
}


class ImageCanvas::ImageCanvasPrivate
{
public:
    ImageCanvasPrivate()
        : keepZoom(false),
	  readOnly(false),
          scaleKind( UNSPEC ),
          defaultScaleKind( FIT_ORIG )
        {}

    bool         keepZoom;  /* keep the zoom settings if images change */
    bool         readOnly;
    ScaleKinds   scaleKind;
    ScaleKinds   defaultScaleKind;

    TQValueList<TQRect> highlightRects;
};

ImageCanvas::ImageCanvas(TQWidget *tqparent,
			 const TQImage *start_image,
			 const char *name 	):
   TQScrollView( tqparent, name ),
   m_contextMenu(0)
{
    d = new ImageCanvasPrivate();

    scale_factor     = 100; // means original size
    maintain_aspect  = true;
    selected         = new TQRect;
    selected->setWidth(0);
    selected->setHeight(0);

    timer_id         = 0;
    pmScaled         = 0;

    image            = start_image;
    moving 	   = MOVE_NONE;

    TQSize img_size;

    if( image && ! image->isNull() )
    {
        img_size = image->size();
        pmScaled = new TQPixmap( img_size );

#ifdef USE_KPIXMAPIO
        *pmScaled = pixIO.convertToPixmap(*image);
#else
        pmScaled->convertFromImage( *image );
#endif

        acquired = true;
    } else {
        img_size = size();
    }


    update_scaled_pixmap();

    // timer-Start and stop
    connect( this, TQT_SIGNAL( newRect()), TQT_SLOT( newRectSlot()));
    connect( this, TQT_SIGNAL( noRect()),  TQT_SLOT( noRectSlot()));

    //zoomOut();scrollview/scrollview
    viewport()->setCursor( crossCursor );
    cr1 = 0;
    cr2 = 0;
    viewport()->setMouseTracking(TRUE);
    viewport()->setBackgroundMode(PaletteBackground);
    show();

}

ImageCanvas::~ImageCanvas()
{
   kdDebug(29000) << "Destructor of ImageCanvas" << endl;
    noRectSlot();
    if( selected ) delete selected;
    selected = 0;
    if( pmScaled ) delete pmScaled;
    pmScaled = 0;
    delete d;
}

void ImageCanvas::deleteView( TQImage *delimage )
{
   const TQImage *img = rootImage();

   if( delimage == img )
   {
      kdDebug(29000) << "ImageCanvas -> emiting newImage(0L)" << endl;
      newImage( 0L );
      noRectSlot();
   }

}

void ImageCanvas::newImageHoldZoom( TQImage *new_image )
{
    bool holdZ = d->keepZoom;

    d->keepZoom = true;
    newImage( new_image );
    d->keepZoom = holdZ;
}

void ImageCanvas::newImage( TQImage *new_image )
{

    /** do cleanups **/
   // dont free old image -> not yours
   image = new_image;

   if( ! image || image->isNull())
   {
      kdDebug(29000) << "newImage: Got Empty image !" << endl;
   }

   if( pmScaled )
   {
      delete pmScaled;
      pmScaled = 0L;
   }

   if( selected )
   {
      noRectSlot();
   }

   /* throw away all highlights */
   d->highlightRects.clear();

   /** handle the new image **/
   if( image )
   {
      if( image->depth() == 1 ) {
	 pmScaled = new TQPixmap( image->size(), 1 );
      } else {
	 int i = TQPixmap::defaultDepth();
	 pmScaled = new TQPixmap( image->size(), i);
      }

      // image->convertDepth(32);
#ifdef USE_KPIXMAPIO

      *pmScaled = pixIO.convertToPixmap(*image);
#else
      pmScaled->convertFromImage( *image );
      // *pmScaled = image->convertToPixmap( );
#endif

      acquired = true;

      if( d->keepZoom )
      {
          kdDebug(29000) << "Preserving Zoom settings!" << endl;
      }
      else
      {
          kdDebug(29000) << "Resetting Zoom to original size!" << endl;
          setScaleKind( defaultScaleKind() );
      }

      update_scaled_pixmap();
      setContentsPos(0,0);
   } else {
      kdDebug(29000) << "New image called without image => deleting!" << endl;
      acquired = false;
      resizeContents( 0,0 );
   }


   kdDebug(29000) << "going to tqrepaint!" << endl;
   tqrepaint( true );
   kdDebug(29000) << "tqrepaint ok" << endl;
}

TQSize ImageCanvas::tqsizeHint() const
{
   return( TQSize( 2, 2 ));
}

void ImageCanvas::enableContextMenu( bool wantContextMenu )
{
   if( wantContextMenu )
   {
      if( ! m_contextMenu )
      {
	 m_contextMenu = new KPopupMenu(this, "IMG_CANVAS");

	 KContextMenuManager::insert( viewport(), m_contextMenu );
      }
   }
   else
   {
      /* remove all items */
      if( m_contextMenu ) m_contextMenu->clear();
      /* contextMenu is not deleted because there is no way to remove
       * it from the contextMenuManager
       */
   }

}

void ImageCanvas::handle_popup( int item )
{
   if( item < ID_POP_ZOOM || item > ID_ORIG_SIZE ) return;

   if( ! image ) return;
   ImgScaleDialog *zoomDia  = 0;

   switch( item )
   {
      case ID_POP_ZOOM:

          zoomDia = new ImgScaleDialog( this, getScaleFactor() );
          if( zoomDia->exec() )
          {
              int sf = zoomDia->getSelected();
	      setScaleKind(ZOOM);
              setScaleFactor( sf );
          }
          delete zoomDia;
	  zoomDia = 0;
	 break;
      case ID_ORIG_SIZE:
	 setScaleKind( FIT_ORIG );
         break;
      case ID_FIT_WIDTH:
          setScaleKind( FIT_WIDTH );
          break;
      case ID_FIT_HEIGHT:
          setScaleKind( FIT_HEIGHT );
	 break;
      case ID_POP_CLOSE:
	 emit( closingRequested());
	 break;

      default: break;
   }
   update_scaled_pixmap();
   tqrepaint();
}


/**
 *   Returns the selected rect in tenth of percent, not in absolute
 *   sizes, eg. 500 means 50.0 % of original width/height.
 *   That makes it easier to work with different scales and units
 */
TQRect ImageCanvas::sel( void )
{
    TQRect retval;
    retval.setCoords(0, 0, 0, 0);

    if( selected && image && selected->width()>MIN_AREA_WIDTH
        && selected->height()>MIN_AREA_HEIGHT )
    {
	/* Get the size in real image pixels */

	// debug_rect( "PRE map", selected );
   	TQRect mapped = inv_scale_matrix.map( (const TQRect) *selected );
   	// debug_rect( "Postmap", &mapped );
   	if( mapped.x() > 0 )
	    retval.setLeft((int) (1000.0/( (double)image->width() / (double)mapped.x())));

	if( mapped.y() > 0 )
	    retval.setTop((int) (1000.0/( (double)image->height() / (double)mapped.y())));

	if( mapped.width() > 0 )
	    retval.setWidth((int) (1000.0/( (double)image->width() / (double)mapped.width())));

	if( mapped.height() > 0 )
	    retval.setHeight((int)(1000.0/( (double)image->height() / (double)mapped.height())));

     }
   	// debug_rect( "sel() return", &retval );
     return( retval );

}

bool ImageCanvas::selectedImage( TQImage *retImg )
{
   TQRect r = sel();
   bool  result  = false;

   const TQImage* entireImg = this->rootImage();

   if( entireImg )
   {
      TQSize s = entireImg->size();

      int x = (s.width()  * r.x())/1000;
      int y = (s.height() * r.y())/1000;
      int w = (s.width()  * r.width())/1000;
      int h = (s.height() * r.height())/1000;

      if( w > 0 && h > 0 ) {
	 *retImg = entireImg->copy( x, y, w, h );
	 result = true;
      }
   }
   return(result);

}


void ImageCanvas::drawContents( TQPainter * p, int clipx, int clipy, int clipw, int cliph )
{
    if( !pmScaled ) return;
    int x1 = 0;
    int y1 = 0;

    int x2 = pmScaled->width();
    int y2 = pmScaled->height();

    if (x1 < clipx) x1=clipx;
    if (y1 < clipy) y1=clipy;
    if (x2 > clipx+clipw-1) x2=clipx+clipw-1;
    if (y2 > clipy+cliph-1) y2=clipy+cliph-1;

    // Paint using the small coordinates...
    // p->scale( used_xscaler, used_yscaler );
    // p->scale( used_xscaler, used_yscaler );
    if ( x2 >= x1 && y2 >= y1 ) {
    	p->tqdrawPixmap( x1, y1, *pmScaled, x1, y1 ); //, clipw, cliph);
        // p->setBrush( red );
        // p->drawRect( x1, y1, clipw, cliph );
    }

        // p->fillRect(x1, y1, x2-x1+1, y2-y1+1, red);

}

void ImageCanvas::timerEvent(TQTimerEvent *)
{
   if(moving!=MOVE_NONE || !acquired ) return;
   cr1++;
   TQPainter p(viewport());
   // p.setWindow( contentsX(), contentsY(), contentsWidth(), contentsHeight());
   drawAreaBorder(&p);
}

void ImageCanvas::newRectSlot( TQRect newSel )
{
   TQRect to_map;
   TQPainter p(viewport());
   drawAreaBorder(&p,TRUE);
   selected->setWidth(0);
   selected->setHeight(0);

   emit( noRect() );

   if ( image )
   {
       int rx, ry, rw, rh;
       int w = image->width();
       int h = image->height();

       kdDebug(29000) << "ImageCanvas: Image size is " << w << "x" << h << endl;
       kdDebug(29000) << "ImageCanvas got selection Rect: W=" << newSel.width() << ", H=" << newSel.height() << endl;
       // to_map.setWidth(static_cast<int>(w * newSel.width() / 1000.0));
       rw = static_cast<int>(w * newSel.width()  / 1000.0);
       rx = static_cast<int>(w * newSel.x()      / 1000.0);
       ry = static_cast<int>(h * newSel.y()      / 1000.0);
       rh = static_cast<int>(h * newSel.height() / 1000.0);
       kdDebug(29000) << "ImageCanvas: scaled Height is " << rh << endl;

       to_map.setRect( rx, ry, rw, rh );

       kdDebug(29000) << "ImageCanvas Selection: W=" << to_map.width() << " H=" << to_map.height() << endl;
       *selected = scale_matrix.map( to_map );
       kdDebug(29000) << "ImageCanvas Selection: W=" << selected->width() << " H=" << selected->height() << endl;
       emit( newRect( sel() ));
       newRectSlot();
   }
}



void ImageCanvas::newRectSlot( )
{
   // printf( "Timer switched on !\n" );
   if( timer_id == 0 )
      timer_id = startTimer( 100 );
}

void ImageCanvas::noRectSlot( void )
{
   // printf( "Timer switched off !\n" );
   if( timer_id ) {
      killTimer( timer_id );
      timer_id = 0;
   }

   if( selected )
      selected->setCoords( 0,0,0,0 );
}

void ImageCanvas::viewportMousePressEvent(TQMouseEvent *ev)
{
   if( ! acquired || ! image ) return;

   if(ev->button()==Qt::LeftButton )
   {

        int cx = contentsX(), cy = contentsY();
        int x = lx = ev->x(),y = ly = ev->y();

	int ix, iy;
	scale_matrix.map( image->width(), image->height(), &ix, &iy );
     	if( x > ix-cx  || y > iy-cy ) return;

     	if( moving == MOVE_NONE )
     	{
		TQPainter p( viewport());
		drawAreaBorder(&p,TRUE);
		moving = classifyPoint( x+cx ,y+cy);

		if(moving == MOVE_NONE)
		{ //Create new area
	   	    selected->setCoords( x+cx, y+cy, x+cx, y+cy );
	            moving = MOVE_BOTTOM_RIGHT;
		}
		drawAreaBorder(&p);
         }
    }
}


void ImageCanvas::viewportMouseReleaseEvent(TQMouseEvent *ev)
{
  if(ev->button()!=Qt::LeftButton || !acquired ) return;

  //// debug( "Mouse Release at %d/%d", ev->x(), ev->y());
  if(moving!=MOVE_NONE) {
    TQPainter p(viewport());
    drawAreaBorder(&p,TRUE);
    moving = MOVE_NONE;
    *selected = selected->normalize();

    if(selected->width () < MIN_AREA_WIDTH ||
       selected->height() < MIN_AREA_HEIGHT)
    {
       selected->setWidth(0);
       selected->setHeight(0);
       emit noRect();
       return;
    }

    drawAreaBorder(&p);
    emit newRect( sel() );
    emit newRect( );
  }
}


void ImageCanvas::viewportMouseMoveEvent(TQMouseEvent *ev)
{
   if( ! acquired || !image) return;

   static cursor_type ps = HREN;
   int x = ev->x(), y = ev->y();
   int cx = contentsX(), cy = contentsY();

   // debug("Mouse Coord x: %d, y: %d | cx: %d, cy: %d", x,y, cx, cy );
   // dont draw out of the scaled Pixmap
   if( x < 0 ) x = 0;
   int ix, iy;
	scale_matrix.map( image->width(), image->height(), &ix, &iy );
   if( x >= ix ) return;

   if( y < 0 ) y = 0;
   if( y >= iy )  return;

   // debug( "cx, cy: %dx%d, x,y: %d, %d",
   //		 cx, cy, x, y );

#if 0
   if( moving == MOVE_NONE )
      moving = classifyPoint(x, y);
#endif
  switch( moving!=MOVE_NONE ? moving:classifyPoint(x+cx,y+cy) ) {
  case MOVE_NONE:
    if(ps!=CROSS) {
      viewport()->setCursor(crossCursor);
      ps = CROSS;
    }
    break;
  case MOVE_LEFT:
  case MOVE_RIGHT:
    if(ps!=HSIZE) {
      viewport()->setCursor(sizeHorCursor);
      ps = HSIZE;
    }
    break;
  case MOVE_TOP:
  case MOVE_BOTTOM:
    if(ps!=VSIZE) {
      viewport()->setCursor(sizeVerCursor);
      ps = VSIZE;
    }
    break;
  case MOVE_TOP_LEFT:
  case MOVE_BOTTOM_RIGHT:
    if(ps!=FDIAG) {
      viewport()->setCursor(sizeFDiagCursor);
      ps = FDIAG;
    }
    break;
  case MOVE_TOP_RIGHT:
  case MOVE_BOTTOM_LEFT:
    if(ps!=BDIAG) {
      viewport()->setCursor(sizeBDiagCursor);
      ps = BDIAG;
    }
    break;
  case MOVE_WHOLE:
    if(ps!=ALL) {
      viewport()->setCursor(sizeAllCursor);
      ps = ALL;
    }
  }
  //At ButtonRelease : normalize + clip
  if( moving!=MOVE_NONE ) {
  	 int mx, my;
    TQPainter p(viewport());
    drawAreaBorder(&p,TRUE);
    switch(moving) {
    case MOVE_NONE: //Just to make compiler happy
      break;
    case MOVE_TOP_LEFT:
      selected->setLeft( x + cx );
    case MOVE_TOP: // fall through
      selected->setTop( y + cy );
      break;
    case MOVE_TOP_RIGHT:
      selected->setTop( y + cy );
    case MOVE_RIGHT: // fall through
      selected->setRight( x + cx );
      break;
    case MOVE_BOTTOM_LEFT:
      selected->setBottom( y + cy );
    case MOVE_LEFT: // fall through
      selected->setLeft( x + cx );
      break;
    case MOVE_BOTTOM_RIGHT:
      selected->setRight( x + cx );
    case MOVE_BOTTOM: // fall through
      selected->setBottom( y + cy );
      break;
    case MOVE_WHOLE:
    	if( selected )
    	{
    		// lx is the Last x-Koord from the run before (global)
    		mx = x-lx; my = y-ly;
    		/* Check if rectangle would run out of the image on right and bottom */
    		if( selected->x()+ selected->width()+mx >= ix-cx )
    		{
    			mx =  ix -cx - selected->width() - selected->x();
    			kdDebug(29000) << "runs out !" << endl;
    		}
    		if( selected->y()+ selected->height()+my >= iy-cy )
    		{
    			my =  iy -cy - selected->height() - selected->y();
    			kdDebug(29000) << "runs out !" << endl;
    		}

    		/* Check if rectangle would run out of the image on left and top */
    		if( selected->x() +mx < 0 )
    			mx =  -selected->x();
    		if( selected->y()+ +my < 0 )
    			my =  -selected->y();

    		x = mx+lx; y = my+ly;

    		selected->moveBy( mx, my );

    	}
    }
    drawAreaBorder(&p);
    lx = x;
    ly = y;
  }
}


void ImageCanvas::setScaleFactor( int i )
{
   kdDebug(29000) <<  "Setting Scalefactor to " << i << endl;
   scale_factor = i;
   if( i == 0 ){
       kdDebug(29000) << "Setting Dynamic Scaling!" << endl;
       setScaleKind(DYNAMIC);
   }
   update_scaled_pixmap();
}


void ImageCanvas::resizeEvent( TQResizeEvent * event )
{
	TQScrollView::resizeEvent( event );
	update_scaled_pixmap();

}

void ImageCanvas::update_scaled_pixmap( void )
{
    resizeContents( 0,0 );
    updateScrollBars();
    if( !pmScaled || !image)
    { 	// debug( "Pixmap px is null in Update_scaled" );
	return;
    }

    TQApplication::setOverrideCursor(waitCursor);

    kdDebug(28000) << "Updating scaled_pixmap" << endl;
    if( scaleKind() == DYNAMIC )
        kdDebug(28000) << "Scaling DYNAMIC" << endl;
    TQSize noSBSize( visibleWidth(), visibleHeight());
    const int sbWidth = kapp->tqstyle().tqpixelMetric( TQStyle::PM_ScrollBarExtent );

    // if( verticalScrollBar()->visible() ) noSBSize.width()+=sbWidth;
    // if( horizontalScrollBar()->visible() ) noSBSize.height()+=sbWidth;

    switch( scaleKind() )
    {
    case DYNAMIC:
        // do scaling to window-size
        used_yscaler = ((double)viewport()-> height()) / ((double)image->height());
        used_xscaler = ((double)viewport()-> width())  / ((double)image->width());
        scale_factor = 0;
        break;
    case FIT_ORIG:
        used_yscaler = used_xscaler = 1.0;
        scale_factor = 100;
        break;
    case FIT_WIDTH:
        used_xscaler = used_yscaler = double(noSBSize.width()) / double(image->width());
        if( used_xscaler * image->height() >= noSBSize.height() )
        {
            /* substract for scrollbar */
            used_xscaler = used_yscaler = double(noSBSize.width() - sbWidth) /
                           double(image->width());
            kdDebug(29000) << "FIT WIDTH scrollbar to substract: " << sbWidth << endl;
        }
        scale_factor = 100*used_xscaler;
        break;
    case FIT_HEIGHT:
        used_yscaler = used_xscaler = double(noSBSize.height())/double(image->height());

        // scale = int(100.0 * noSBSize.height() / image->height());
        if( used_xscaler * image->width() >= noSBSize.width() )
        {
            /* substract for scrollbar */
            used_xscaler = used_yscaler = double(noSBSize.height() - sbWidth) /
                           double(image->height());

            kdDebug(29000) << "FIT HEIGHT scrollbar to substract: " << sbWidth << endl;
            // scale = int(100.0*(noSBSize.height() -sbWidth) / image->height());
        }
        scale_factor = 100*used_xscaler;

        break;
    case ZOOM:
        used_xscaler = used_yscaler = double(getScaleFactor())/100.0;
        scale_factor = 100*used_xscaler;
        break;
    default:
        break;
    }

    // reconvert the selection to orig size
    if( selected ) {
        *selected = inv_scale_matrix.map( (const TQRect) *selected );
    }

    scale_matrix.reset();                         // transformation matrix
    inv_scale_matrix.reset();


    if( scaleKind() == DYNAMIC && maintain_aspect  ) {
        // printf( "Skaler: x: %f, y: %f\n", x_scaler, y_scaler );
        used_xscaler = used_yscaler <  used_xscaler ?
                       used_yscaler : used_xscaler;
        used_yscaler = used_xscaler;
    }

    scale_matrix.scale( used_xscaler, used_yscaler );  // define scale factors
    inv_scale_matrix = scale_matrix.invert();	// for redraw of selection

    if( selected ) {
        *selected = scale_matrix.map( (const TQRect )*selected );
    }

#ifdef USE_KPIXMAPIO
    *pmScaled = pixIO.convertToPixmap(*image);
#else
    pmScaled->convertFromImage( *image );
#endif

    *pmScaled = pmScaled->xForm( scale_matrix );  // create scaled pixmap

    /* Resizing to 0,0 never may be dropped, otherwise there are problems
     * with redrawing of new images.
     */
    resizeContents( static_cast<int>(image->width() * used_xscaler),
                    static_cast<int>(image->height() * used_yscaler ) );

    TQApplication::restoreOverrideCursor();
}


void ImageCanvas::drawHAreaBorder(TQPainter &p,int x1,int x2,int y,int r)
{
	if( ! acquired || !image ) return;

  if(moving!=MOVE_NONE) cr2 = 0;
  int inc = 1;
  int cx = contentsX(), cy = contentsY();
  if(x2 < x1) inc = -1;

  if(!r) {
    if(cr2 & 4) p.setPen(black);
    else p.setPen(white);
  } else if(!acquired) p.setPen(TQPen(TQColor(150,150,150)));

  for(;;) {
    if(TQT_TQRECT_OBJECT(rect()).contains(TQPoint(x1,y))) {
      if( r && acquired ) {
	int re_x1, re_y;
	inv_scale_matrix.map( x1+cx, y+cy, &re_x1, &re_y );
	re_x1 = MIN( image->width()-1, re_x1 );
	re_y = MIN( image->height()-1, re_y );

	p.setPen( TQPen( TQColor( image->pixel(re_x1, re_y))));
      }
      p.drawPoint(x1,y);
    }
    if(!r) {
      cr2++;
      cr2 &= 7;
      if(!(cr2&3)) {
			if(cr2&4) p.setPen(black);
			else p.setPen(white);
      }
    }
    if(x1==x2) break;
    x1 += inc;
  }

}

void ImageCanvas::drawVAreaBorder(TQPainter &p, int x, int y1, int y2, int r )
{
	if( ! acquired || !image ) return;
  if( moving!=MOVE_NONE ) cr2 = 0;
  int inc = 1;
  if( y2 < y1 ) inc = -1;

  int cx = contentsX(), cy = contentsY();


  if( !r ) {
    if( cr2 & 4 ) p.setPen(black);
    else
      p.setPen(white);
  } else
    if( !acquired ) p.setPen( TQPen( TQColor(150,150,150) ) );

  for(;;) {
    if(TQT_TQRECT_OBJECT(rect()).contains( TQPoint(x,y1) )) {
      if( r && acquired ) {
	int re_y1, re_x;
	inv_scale_matrix.map( x+cx, y1+cy, &re_x, &re_y1 );
	re_x = MIN( image->width()-1, re_x );
	re_y1 = MIN( image->height()-1, re_y1 );

	p.setPen( TQPen( TQColor( image->pixel( re_x, re_y1) )));
      }
      p.drawPoint(x,y1);
    }

    if(!r) {
      cr2++;
      cr2 &= 7;
      if(!(cr2&3)) {
			if(cr2&4) p.setPen(black);
			else p.setPen(white);
      }
    }
    if(y1==y2) break;
    y1 += inc;
  }

}

void ImageCanvas::drawAreaBorder(TQPainter *p,int r )
{
   if(selected->isNull()) return;

   cr2 = cr1;
   int xinc = 1;
   if( selected->right() < selected->left()) xinc = -1;
   int yinc = 1;
   if( selected->bottom() < selected->top()) yinc = -1;

   if( selected->width() )
      drawHAreaBorder(*p,
		      selected->left() - contentsX(),
		      selected->right()- contentsX(),
		      selected->top() - contentsY(), r );
   if( selected->height() ) {
      drawVAreaBorder(*p,
		      selected->right() - contentsX(),
		      selected->top()- contentsY()+yinc,
		      selected->bottom()- contentsY(),r);
   if(selected->width()) {
      drawHAreaBorder(*p,
	  	      selected->right()-xinc- contentsX(),
                      selected->left()- contentsX(),
                      selected->bottom()- contentsY(),r);
      drawVAreaBorder(*p,
	     	       selected->left()- contentsX(),
                       selected->bottom()-yinc- contentsY(),
		       selected->top()- contentsY()+yinc,r);
      }
   }
}

// x and y come as real pixmap-coords, not contents-coords
preview_state ImageCanvas::classifyPoint(int x,int y)
{
  if(selected->isEmpty()) return MOVE_NONE;

  TQRect a = selected->normalize();

  int top = 0,left = 0,right = 0,bottom = 0;
  int lx = a.left()-x, rx = x-a.right();
  int ty = a.top()-y, by = y-a.bottom();

  if( a.width() > delta*2+2 )
    lx = abs(lx), rx = abs(rx);

  if(a.height()>delta*2+2)
    ty = abs(ty), by = abs(by);

  if( lx>=0 && lx<=delta ) left++;
  if( rx>=0 && rx<=delta ) right++;
  if( ty>=0 && ty<=delta ) top++;
  if( by>=0 && by<=delta ) bottom++;
  if( y>=a.top() &&y<=a.bottom() ) {
    if(left) {
      if(top) return MOVE_TOP_LEFT;
      if(bottom) return MOVE_BOTTOM_LEFT;
      return MOVE_LEFT;
    }
    if(right) {
      if(top) return MOVE_TOP_RIGHT;
      if(bottom) return MOVE_BOTTOM_RIGHT;
      return MOVE_RIGHT;
    }
  }
  if(x>=a.left()&&x<=a.right()) {
    if(top) return MOVE_TOP;
    if(bottom) return MOVE_BOTTOM;
    if(selected->contains(TQPoint(x,y))) return MOVE_WHOLE;
  }
  return MOVE_NONE;
}


int ImageCanvas::getBrightness() const
{
   return brightness;
}

int ImageCanvas::getContrast() const
{
   return contrast;
}

int ImageCanvas::getGamma() const
{
   return gamma;
}

int ImageCanvas::getScaleFactor() const
{
   return( scale_factor );
}

const TQImage *ImageCanvas::rootImage( )
{
   return( image );
}

void ImageCanvas::setReadOnly( bool ro )
{
    d->readOnly = ro;
    emit( imageReadOnly(ro) );
}

bool ImageCanvas::readOnly()
{
    return d->readOnly;
}

void ImageCanvas::setBrightness(int b)
{
   brightness = b;
}

void ImageCanvas::setContrast(int c)
{
   contrast = c;
}

void ImageCanvas::setGamma(int c)
{
   gamma = c;
}

void ImageCanvas::setKeepZoom( bool k )
{
    d->keepZoom = k;
}

ImageCanvas::ScaleKinds ImageCanvas::scaleKind()
{
    if( d->scaleKind == UNSPEC )
        return defaultScaleKind();
    else
        return d->scaleKind;
}

ImageCanvas::ScaleKinds ImageCanvas::defaultScaleKind()
{
    return d->defaultScaleKind;
}

void ImageCanvas::setScaleKind( ScaleKinds k )
{
    if( k == d->scaleKind ) return; // no change, return
    d->scaleKind = k;

    emit scalingChanged(scaleKindString());
}

void ImageCanvas::setDefaultScaleKind( ScaleKinds k )
{
    d->defaultScaleKind = k;
}

const TQString ImageCanvas::imageInfoString( int w, int h, int d )
{
    if( w == 0 && h == 0 && d == 0 )
    {
        if( image )
        {
            w = image->width();
            h = image->height();
            d = image->depth();
        }
        else
            return TQString("-");
    }
    return i18n("%1x%2 pixel, %3 bit").tqarg(w).tqarg(h).tqarg(d);
}


const TQString ImageCanvas::scaleKindString()
{
    switch( scaleKind() )
    {
    case DYNAMIC:
        return i18n("Fit window best");
        break;
    case FIT_ORIG:
        return i18n("Original size");
        break;
    case FIT_WIDTH:
        return i18n("Fit Width");
        break;
    case FIT_HEIGHT:
        return i18n("Fit Height");
        break;
    case ZOOM:
        return i18n("Zoom to %1 %%").tqarg( TQString::number(getScaleFactor()));
        break;
    default:
        return i18n("Unknown scaling!");
        break;
    }
}


int ImageCanvas::highlight( const TQRect& rect, const TQPen& pen, const TQBrush&, bool ensureVis  )
{
    TQRect saveRect;
    saveRect.setRect( rect.x()-2, rect.y()-2, rect.width()+4, rect.height()+4 );
    d->highlightRects.append( saveRect );

    int idx = d->highlightRects.findIndex(saveRect);

    TQRect targetRect = scale_matrix.map( rect );

    TQPainter p( pmScaled );

    p.setPen(pen);
    p.drawLine( targetRect.x(), targetRect.y()+targetRect.height(),
                targetRect.x()+targetRect.width(), targetRect.y()+targetRect.height() );

    p.flush();
    updateContents(targetRect.x()-1, targetRect.y()-1,
                   targetRect.width()+2, targetRect.height()+2 );

    if( ensureVis )
    {
        TQPoint p = targetRect.center();
        ensureVisible( p.x(), p.y(), 10+targetRect.width()/2, 10+targetRect.height()/2 );
    }

    return idx;
}

void ImageCanvas::removeHighlight( int idx )
{
    if( (unsigned) idx >= d->highlightRects.count() )
    {
        kdDebug(28000) << "removeHighlight: Not a valid index" << endl;
        return;
    }

    /* take the rectangle from the stored highlight rects and map it to the viewer scaling */
    TQRect r = d->highlightRects[idx];
    d->highlightRects.remove(r);
    TQRect targetRect = scale_matrix.map( r );

    /* create a small pixmap with a copy of the region in question of the original image */
    TQPixmap origPix;
    origPix.convertFromImage( image->copy(r) );
    /* and scale it */
    TQPixmap scaledPix = origPix.xForm( scale_matrix );
    /* and finally draw it */
    TQPainter p( pmScaled );
    p.drawPixmap( targetRect, scaledPix );
    p.flush();

    /* update the viewers contents */
    updateContents(targetRect.x()-1, targetRect.y()-1,
                   targetRect.width()+2, targetRect.height()+2 );


}


#include "img_canvas.moc"