tdegraphics/kdvi/dviRenderer_draw.cpp

/*
 * Copyright (c) 1994 Paul Vojta.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * NOTE:
 *	xdvi is based on prior work as noted in the modification history, below.
 */

/*
 * DVI previewer for X.
 *
 * Eric Cooper, CMU, September 1985.
 *
 * Code derived from dvi-imagen.c.
 *
 * Modification history:
 * 1/1986	Modified for X.10	--Bob Scheifler, MIT LCS.
 * 7/1988	Modified for X.11	--Mark Eichin, MIT
 * 12/1988	Added 'R' option, toolkit, magnifying glass
 *					--Paul Vojta, UC Berkeley.
 * 2/1989	Added tpic support	--Jeffrey Lee, U of Toronto
 * 4/1989	Modified for System V	--Donald Richardson, Clarkson Univ.
 * 3/1990	Added VMS support	--Scott Allendorf, U of Iowa
 * 7/1990	Added reflection mode	--Michael Pak, Hebrew U of Jerusalem
 * 1/1992	Added greyscale code	--Till Brychcy, Techn. Univ. Muenchen
 *					  and Lee Hetherington, MIT
 * 4/1994	Added DPS support, bounding box
 *					--Ricardo Telichevesky
 *					  and Luis Miguel Silveira, MIT RLE.
 */

//#define DEBUG_RENDER 0

#include <config.h>

#include "dviRenderer.h"
#include "dvi.h"
#include "dviFile.h"
#include "fontpool.h"
#include "hyperlink.h"
#include "kdvi_multipage.h"
#include "performanceMeasurement.h"
#include "psgs.h"
#include "renderedDviPagePixmap.h"
#include "TeXFont.h"
#include "textBox.h"
#include "xdvi.h"

#include <stdlib.h>
#include <kdebug.h>
#include <klocale.h>
#include <kmessagebox.h>
#include <kprocess.h>
#include <tqpainter.h>
#include <tqbitmap.h> 
#include <tqimage.h> 
#include <tqpainter.h>
#include <tqfileinfo.h>

extern TQPainter *foreGroundPainter;


/** Routine to print characters.  */

void dviRenderer::set_char(unsigned int cmd, unsigned int ch)
{
#ifdef DEBUG_RENDER
  kdDebug(4300) << "set_char #" << ch << endl;
#endif

  glyph *g;
  if (colorStack.isEmpty())
    g = ((TeXFont *)(currinf.fontp->font))->getGlyph(ch, true, globalColor);
  else
    g = ((TeXFont *)(currinf.fontp->font))->getGlyph(ch, true, colorStack.top());
  if (g == NULL)
    return;

  long dvi_h_sav = currinf.data.dvi_h;

  TQPixmap pix = g->shrunkenCharacter;
  int x = ((int) ((currinf.data.dvi_h) / (shrinkfactor * 65536))) - g->x2;
  int y = currinf.data.pxl_v - g->y2;
  
  // Draw the character.
  foreGroundPainter->drawPixmap(x, y, pix);
  
  // Are we drawing text for a hyperlink? And are hyperlinks
  // enabled?
  if (HTML_href != NULL) {
    // Now set up a rectangle which is checked against every mouse
    // event.
    if (line_boundary_encountered == true) {
      // Set up hyperlink
      Hyperlink dhl;
      dhl.baseline = currinf.data.pxl_v;
      dhl.box.setRect(x, y, pix.width(), pix.height());
      dhl.linkText = *HTML_href;
      currentlyDrawnPage->hyperLinkList.push_back(dhl);
    } else {
      TQRect dshunion = currentlyDrawnPage->hyperLinkList[currentlyDrawnPage->hyperLinkList.size()-1].box.unite(TQRect(x, y, pix.width(), pix.height())) ;
      currentlyDrawnPage->hyperLinkList[currentlyDrawnPage->hyperLinkList.size()-1].box = dshunion;
    }
  }
  
  // Are we drawing text for a source hyperlink? And are source
  // hyperlinks enabled?
  // If we are printing source hyperlinks are irrelevant, otherwise we
  // actually got a pointer to a RenderedDviPagePixmap.
  RenderedDviPagePixmap* currentDVIPage = dynamic_cast<RenderedDviPagePixmap*>(currentlyDrawnPage);
  if (source_href != 0 && currentDVIPage) {
    // Now set up a rectangle which is checked against every mouse
    // event.
    if (line_boundary_encountered == true) {
      // Set up source hyperlinks
      Hyperlink dhl;
      dhl.baseline = currinf.data.pxl_v;
      dhl.box.setRect(x, y, pix.width(), pix.height());
      if (source_href != NULL) 
        dhl.linkText = *source_href;
      else
        dhl.linkText = "";
      currentDVIPage->sourceHyperLinkList.push_back(dhl);
    } else {
      TQRect dshunion = currentDVIPage->sourceHyperLinkList[currentDVIPage->sourceHyperLinkList.size()-1].box.unite(TQRect(x, y, pix.width(), pix.height())) ;
      currentDVIPage->sourceHyperLinkList[currentDVIPage->sourceHyperLinkList.size()-1].box = dshunion;
    }
  }
  
  // Code for DVI -> text functions (e.g. marking of text, full text
  // search, etc.). Set up the currentlyDrawnPage->textBoxList.
  TextBox link;
  link.box.setRect(x, y, pix.width(), pix.height());
  link.text = "";
  currentlyDrawnPage->textBoxList.push_back(link);

  switch(ch) {
  case 0x0b:
    currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += "ff";
    break;
  case 0x0c:
    currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += "fi";
    break;
  case 0x0d:
    currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += "fl";
    break;
  case 0x0e:
    currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += "ffi";
    break;
  case 0x0f:
    currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += "ffl";
    break;
    
  case 0x7b:
    currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += "-";
    break;
  case 0x7c:
    currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += "---";
    break;
  case 0x7d:
    currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += "\"";
    break;
  case 0x7e:
    currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += "~";
    break;
  case 0x7f:
    currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += "@@"; // @@@ check!
    break;
    
  default:
    if ((ch >= 0x21) && (ch <= 0x7a))
      currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += TQChar(ch);
    else
      currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += "?";
    break;
  }
  
  
  if (cmd == PUT1)
    currinf.data.dvi_h = dvi_h_sav;
  else
    currinf.data.dvi_h += (int)(currinf.fontp->scaled_size_in_DVI_units * dviFile->getCmPerDVIunit() * 
				(1200.0 / 2.54)/16.0 * g->dvi_advance_in_units_of_design_size_by_2e20 + 0.5);

  word_boundary_encountered = false;
  line_boundary_encountered = false;
}

void dviRenderer::set_empty_char(unsigned int, unsigned int)
{
  return;
}

void dviRenderer::set_vf_char(unsigned int cmd, unsigned int ch)
{
#ifdef DEBUG_RENDER
  kdDebug(4300) << "dviRenderer::set_vf_char( cmd=" << cmd << ", ch=" << ch << " )" << endl;
#endif

  static unsigned char   c;
  macro *m = &currinf.fontp->macrotable[ch];
  if (m->pos == NULL) {
    kdError(4300) << "Character " << ch << " not defined in font " << currinf.fontp->fontname << endl;
    m->pos = m->end = &c;
    return;
  }

  long dvi_h_sav = currinf.data.dvi_h;

  struct drawinf oldinfo = currinf;
  currinf.data.w         = 0;
  currinf.data.x         = 0;
  currinf.data.y         = 0;
  currinf.data.z         = 0;
  
  currinf.fonttable         = &(currinf.fontp->vf_table);
  currinf._virtual          = currinf.fontp;
  TQ_UINT8 *command_ptr_sav  = command_pointer;
  TQ_UINT8 *end_ptr_sav      = end_pointer;
  command_pointer           = m->pos;
  end_pointer               = m->end;
  draw_part(currinf.fontp->scaled_size_in_DVI_units*(dviFile->getCmPerDVIunit() * 1200.0 / 2.54)/16.0, true);
  command_pointer           = command_ptr_sav;
  end_pointer               = end_ptr_sav;
  currinf = oldinfo;
  
  if (cmd == PUT1)
    currinf.data.dvi_h = dvi_h_sav;
  else
    currinf.data.dvi_h += (int)(currinf.fontp->scaled_size_in_DVI_units * dviFile->getCmPerDVIunit() * 
				(1200.0 / 2.54)/16.0 * m->dvi_advance_in_units_of_design_size_by_2e20 + 0.5);
}


void dviRenderer::set_no_char(unsigned int cmd, unsigned int ch)
{
#ifdef DEBUG_RENDER
  kdDebug(4300) << "dviRenderer::set_no_char( cmd=" << cmd << ", ch =" << ch << " )"  << endl;
#endif
  
  if (currinf._virtual) {
    currinf.fontp = currinf._virtual->first_font;
    if (currinf.fontp != NULL) {
      currinf.set_char_p = currinf.fontp->set_char_p;
      (this->*currinf.set_char_p)(cmd, ch);
      return;
    }
  }

  errorMsg = i18n("The DVI code set a character of an unknown font.");
  return;
}


void dviRenderer::draw_part(double current_dimconv, bool is_vfmacro)
{
#ifdef DEBUG_RENDER
  kdDebug(4300) << "draw_part" << endl;
#endif

  TQ_INT32 RRtmp=0, WWtmp=0, XXtmp=0, YYtmp=0, ZZtmp=0;
  TQ_UINT8 ch;

  currinf.fontp        = NULL;
  currinf.set_char_p   = &dviRenderer::set_no_char;

  for (;;) {
    ch = readUINT8();
    if (ch <= (unsigned char) (SETCHAR0 + 127)) {
      (this->*currinf.set_char_p)(ch, ch);
    } else
      if (FNTNUM0 <= ch && ch <= (unsigned char) (FNTNUM0 + 63)) {
	currinf.fontp = currinf.fonttable->find(ch - FNTNUM0);
	if (currinf.fontp == NULL) {
	  errorMsg = i18n("The DVI code referred to font #%1, which was not previously defined.").tqarg(ch - FNTNUM0);
	  return;
	}
	currinf.set_char_p = currinf.fontp->set_char_p;
      } else {
	TQ_INT32 a, b;
	
	switch (ch) {
	case SET1:
	case PUT1:
	  (this->*currinf.set_char_p)(ch, readUINT8());
	  break;
	  
	case SETRULE:
	  if (is_vfmacro == false) {
	    word_boundary_encountered = true;
	    line_boundary_encountered = true;
	  }
	  /* Be careful, dvicopy outputs rules with height =
	     0x80000000. We don't want any SIGFPE here. */
	  a = readUINT32();
	  b = readUINT32();
	  b = ((long) (b *  current_dimconv));
	  if (a > 0 && b > 0) {
	    int h = ((int) ROUNDUP(((long) (a *  current_dimconv)), shrinkfactor * 65536));
	    int w =  ((int) ROUNDUP(b, shrinkfactor * 65536));
	    
	    if (colorStack.isEmpty())
	      foreGroundPainter->fillRect( ((int) ((currinf.data.dvi_h) / (shrinkfactor * 65536))),
					 currinf.data.pxl_v - h + 1, w?w:1, h?h:1, globalColor );
	    else
	      foreGroundPainter->fillRect( ((int) ((currinf.data.dvi_h) / (shrinkfactor * 65536))),
					currinf.data.pxl_v - h + 1, w?w:1, h?h:1, colorStack.top() );
	  }
	  currinf.data.dvi_h += b;
	  break;

	case PUTRULE:
	  if (is_vfmacro == false) {
	    word_boundary_encountered = true;
	    line_boundary_encountered = true;
	  }
	  a = readUINT32();
	  b = readUINT32();
	  a = ((long) (a *  current_dimconv));
	  b = ((long) (b *  current_dimconv));
	  if (a > 0 && b > 0) {
	    int h = ((int) ROUNDUP(a, shrinkfactor * 65536));
	    int w = ((int) ROUNDUP(b, shrinkfactor * 65536));
	    if (colorStack.isEmpty())
	      foreGroundPainter->fillRect( ((int) ((currinf.data.dvi_h) / (shrinkfactor * 65536))),
					 currinf.data.pxl_v - h + 1, w?w:1, h?h:1, globalColor );
	    else
	      foreGroundPainter->fillRect( ((int) ((currinf.data.dvi_h) / (shrinkfactor * 65536))),
					currinf.data.pxl_v - h + 1, w?w:1, h?h:1, colorStack.top() );
	  }
	  break;

	case NOP:
	  break;
	  
	case BOP:
	  if (is_vfmacro == false) {
	    word_boundary_encountered = true;
	    line_boundary_encountered = true;
	  }
	  command_pointer += 11 * 4;
	  currinf.data.dvi_h = 1200 << 16; // Reminder: DVI-coordinates start at (1",1") from top of page
	  currinf.data.dvi_v = 1200;
	  currinf.data.pxl_v = int(currinf.data.dvi_v/shrinkfactor);
	  currinf.data.w = currinf.data.x = currinf.data.y = currinf.data.z = 0;
	  break;

	case EOP:
	  // Check if we are just at the end of a virtual font macro.
	  if (is_vfmacro == false) {
	    // This is really the end of a page, and not just the end
	    // of a macro. Mark the end of the current word.
	    word_boundary_encountered = true;
	    line_boundary_encountered = true;
	    // Sanity check for the dvi-file: The DVI-standard asserts
	    // that at the end of a page, the stack should always be
	    // empty.
	    if (!stack.isEmpty()) {
	      kdDebug(4300) << "DRAW: The stack was not empty when the EOP command was encountered." << endl;
	      errorMsg = i18n("The stack was not empty when the EOP command was encountered.");
	      return;
	    }
	  }
	  return;

	case PUSH:
	  stack.push(currinf.data);
	  break;

	case POP:
	  if (stack.isEmpty()) {
	    errorMsg = i18n("The stack was empty when a POP command was encountered.");
	    return;
	  } else
	    currinf.data = stack.pop();
	  word_boundary_encountered = true;
	  line_boundary_encountered = true;
	  break;

	case RIGHT1:
	case RIGHT2:
	case RIGHT3:
	case RIGHT4:
	  RRtmp = readINT(ch - RIGHT1 + 1);

	  // A horizontal motion in the range 4 * font space [f] < h <
	  // font space [f] will be treated as a kern that is not
	  // indicated in the printouts that DVItype produces between
	  // brackets. We allow a larger space in the negative
	  // direction than in the positive one, because TEX makes
	  // comparatively large backspaces when it positions
	  // accents. (comments stolen from the source of dvitype)
	  if ((is_vfmacro == false) &&
	      (currinf.fontp != 0) &&
	      ((RRtmp >= currinf.fontp->scaled_size_in_DVI_units/6) || (RRtmp <= -4*(currinf.fontp->scaled_size_in_DVI_units/6))) && 
	      (currentlyDrawnPage->textBoxList.size() > 0))
	    currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += ' ';
	  currinf.data.dvi_h += ((long) (RRtmp *  current_dimconv));
	  break;
	  
	case W1:
	case W2:
	case W3:
	case W4:
	  WWtmp = readINT(ch - W0);
	  currinf.data.w = ((long) (WWtmp *  current_dimconv));
	case W0:
	  if ((is_vfmacro == false) && 
	      (currinf.fontp != 0) &&
	      ((WWtmp >= currinf.fontp->scaled_size_in_DVI_units/6) || (WWtmp <= -4*(currinf.fontp->scaled_size_in_DVI_units/6))) && 
	      (currentlyDrawnPage->textBoxList.size() > 0) )
	    currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += ' ';
	  currinf.data.dvi_h += currinf.data.w;
	  break;
	  
	case X1:
	case X2:
	case X3:
	case X4:
	  XXtmp = readINT(ch - X0);
	  currinf.data.x = ((long) (XXtmp *  current_dimconv));
	case X0:
	  if ((is_vfmacro == false)  && 
	      (currinf.fontp != 0) &&
	      ((XXtmp >= currinf.fontp->scaled_size_in_DVI_units/6) || (XXtmp <= -4*(currinf.fontp->scaled_size_in_DVI_units/6))) && 
	      (currentlyDrawnPage->textBoxList.size() > 0))
	    currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += ' ';
	  currinf.data.dvi_h += currinf.data.x;
	  break;
	  
	case DOWN1:
	case DOWN2:
	case DOWN3:
	case DOWN4:
	  {
	    TQ_INT32 DDtmp = readINT(ch - DOWN1 + 1);
	    if ((is_vfmacro == false) &&
		(currinf.fontp != 0) &&
		(abs(DDtmp) >= 5*(currinf.fontp->scaled_size_in_DVI_units/6)) && 
		(currentlyDrawnPage->textBoxList.size() > 0)) {
	      word_boundary_encountered = true;
	      line_boundary_encountered = true;
	      if (abs(DDtmp) >= 10*(currinf.fontp->scaled_size_in_DVI_units/6)) 
		currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += '\n';
	    }
	    currinf.data.dvi_v += ((long) (DDtmp *  current_dimconv))/65536;
	    currinf.data.pxl_v  = int(currinf.data.dvi_v/shrinkfactor);
	  }
	  break;
	  
	case Y1:
	case Y2:
	case Y3:
	case Y4:
	  YYtmp = readINT(ch - Y0);
	  currinf.data.y    = ((long) (YYtmp *  current_dimconv));
	case Y0:
	  if ((is_vfmacro == false) &&
	      (currinf.fontp != 0) &&
	      (abs(YYtmp) >= 5*(currinf.fontp->scaled_size_in_DVI_units/6)) && 
	      (currentlyDrawnPage->textBoxList.size() > 0)) {
	    word_boundary_encountered = true;
	    line_boundary_encountered = true;
	    if (abs(YYtmp) >= 10*(currinf.fontp->scaled_size_in_DVI_units/6)) 
	      currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += '\n';
	  }
	  currinf.data.dvi_v += currinf.data.y/65536;
	  currinf.data.pxl_v = int(currinf.data.dvi_v/shrinkfactor);
	  break;
	  
	case Z1:
	case Z2:
	case Z3:
	case Z4:
	  ZZtmp = readINT(ch - Z0);
	  currinf.data.z    = ((long) (ZZtmp *  current_dimconv));
	case Z0:
	  if ((is_vfmacro == false) &&
	      (currinf.fontp != 0) &&
	      (abs(ZZtmp) >= 5*(currinf.fontp->scaled_size_in_DVI_units/6)) && 
	      (currentlyDrawnPage->textBoxList.size() > 0)) {
	    word_boundary_encountered = true;
	    line_boundary_encountered = true;
	    if (abs(ZZtmp) >= 10*(currinf.fontp->scaled_size_in_DVI_units/6)) 
	      currentlyDrawnPage->textBoxList[currentlyDrawnPage->textBoxList.size()-1].text += '\n';
	  }
	  currinf.data.dvi_v += currinf.data.z/65536;
	  currinf.data.pxl_v  = int(currinf.data.dvi_v/shrinkfactor);
	  break;
	  
	case FNT1:
	case FNT2:
	case FNT3:
	  currinf.fontp = currinf.fonttable->find(readUINT(ch - FNT1 + 1));
	  if (currinf.fontp == NULL) {
	    errorMsg = i18n("The DVI code referred to a font which was not previously defined.");
	    return;
	  }
	  currinf.set_char_p = currinf.fontp->set_char_p;
	  break;

	case FNT4:
	  currinf.fontp = currinf.fonttable->find(readINT(ch - FNT1 + 1));
	  if (currinf.fontp == NULL) {
	    errorMsg = i18n("The DVI code referred to a font which was not previously defined.");
	    return;
	  }
	  currinf.set_char_p = currinf.fontp->set_char_p;
	  break;

	case XXX1:
	case XXX2:
	case XXX3:
	case XXX4:
	  if (is_vfmacro == false) {
	    word_boundary_encountered = true;
	    line_boundary_encountered = true;
	  }
	  a = readUINT(ch - XXX1 + 1);
	  if (a > 0) {
	    char	*cmd	= new char[a+1];
	    strncpy(cmd, (char *)command_pointer, a);
	    command_pointer += a;
	    cmd[a] = '\0';
	    applicationDoSpecial(cmd);
	    delete [] cmd;
	  }
	  break;

	case FNTDEF1:
	case FNTDEF2:
	case FNTDEF3:
	case FNTDEF4:
	  command_pointer += 12 + ch - FNTDEF1 + 1;
          {
            TQ_UINT8 tempa = readUINT8();
            TQ_UINT8 tempb = readUINT8();
	    command_pointer += tempa + tempb;
          }
	  break;
	  
	case PRE:
	case POST:
	case POSTPOST:
	  errorMsg = i18n("An illegal command was encountered.");
	  return;
	  break;
	  
	default:
	  errorMsg = i18n("The unknown op-code %1 was encountered.").tqarg(ch);
	  return;
	} /* end switch*/
      } /* end else (ch not a SETCHAR or FNTNUM) */
  } /* end for */
}


void dviRenderer::draw_page()
{
  // Reset a couple of variables
  HTML_href         = 0;
  source_href       = 0;
  penWidth_in_mInch = 0.0;

  // Calling resize() here rather than clear() means that the memory
  // taken up by the vector is not freed. This is faster than
  // constantly allocating/freeing memory.
  currentlyDrawnPage->textBoxList.resize(0);

  RenderedDviPagePixmap* currentDVIPage = dynamic_cast<RenderedDviPagePixmap*>(currentlyDrawnPage);
  if (currentDVIPage)
  {
    currentDVIPage->sourceHyperLinkList.resize(0);
  }

#ifdef PERFORMANCE_MEASUREMENT
  // If this is the first time a page is drawn, take the time that is
  // elapsed till the kdvi_multipage was constructed, and print
  // it. Set the flag so that is message will not be printed again.
  if (performanceFlag == 0) {
    kdDebug(4300) << "Time elapsed till the first page is drawn: " << performanceTimer.restart() << "ms" << endl;
    performanceFlag = 1;
  }
#endif


#ifdef DEBUG_RENDER
  kdDebug(4300) <<"draw_page" << endl;
#endif

  if (!accessibilityBackground)
  {
    foreGroundPainter->fillRect( foreGroundPainter->viewport(), PS_interface->getBackgroundColor(current_page) );
  }
  else
  {
    // In accessiblity mode use the custom background color
    foreGroundPainter->fillRect( foreGroundPainter->viewport(), accessibilityBackgroundColor );
  }

  // Render the PostScript background, if there is one.
  if (_postscript)
  {
    // In accessiblity mode use the custom background color
    if (accessibilityBackground)
    {
      // Flag permanent is set to false because otherwise we would not be able to restore
      // the original background color.
      PS_interface->setBackgroundColor(current_page, accessibilityBackgroundColor, false);
    }
    else
      PS_interface->restoreBackgroundColor(current_page);

    PS_interface->graphics(current_page, resolutionInDPI, dviFile->getMagnification(), foreGroundPainter);
  }

  // Now really write the text
  if (dviFile->page_offset.isEmpty() == true)
    return;
  if (current_page < dviFile->total_pages) {
    command_pointer = dviFile->dvi_Data() + dviFile->page_offset[current_page];
    end_pointer     = dviFile->dvi_Data() + dviFile->page_offset[current_page+1];
  } else
    command_pointer = end_pointer = 0;
  
  memset((char *) &currinf.data, 0, sizeof(currinf.data));
  currinf.fonttable      = &(dviFile->tn_table);
  currinf._virtual       = 0;
  
  double fontPixelPerDVIunit = dviFile->getCmPerDVIunit() * 1200.0/2.54;
  
  draw_part(65536.0*fontPixelPerDVIunit, false);
  if (HTML_href != 0) {
    delete HTML_href;
    HTML_href = 0;
  }
  if (source_href != 0) {
    delete source_href;
    source_href = 0;
  }
}