dvirenderer_prescan.cpp

来自「okular」· C++ 代码 · 共 801 行 · 第 1/2 页

  // The line is supposed to start with "..ile=", and then comes the
  // filename. Figure out what the filename is and stow it away. Of
  // course, this does not work if the filename contains spaces
  // (already the simplified() above is wrong). If you have
  // files like this, go away.
  QString EPSfilename = include_command;
  EPSfilename.truncate(EPSfilename.indexOf(' '));

  // Strip enclosing quotation marks which are included by some LaTeX
  // macro packages (but not by others). This probably means that
  // graphic files are no longer found if the filename really does
  // contain quotes, but we don't really care that much.
  if ((EPSfilename.at(0) == '\"') && (EPSfilename.at(EPSfilename.length()-1) == '\"')) {
    EPSfilename = EPSfilename.mid(1,EPSfilename.length()-2);
  }

  // If the file name ends in 'png', 'gif', 'jpg' or 'jpeg', we assume
  // that this is NOT a PostScript file, and we exit here.
  QString ending = EPSfilename.section('.', -1).toLower();
  if ((ending == "png") || (ending == "gif") || (ending == "jpg") || (ending == "jpeg")) {
    dviFile->numberOfExternalNONPSFiles++;
    return;
  }

  // Now assume that the graphics file *is* a PostScript file
  dviFile->numberOfExternalPSFiles++;

  // Now locate the Gfx file on the hard disk...
  EPSfilename = ghostscript_interface::locateEPSfile(EPSfilename, baseURL);

  // If the EPSfilename really points to a PDF file, convert that file now.
  if (ending == "pdf") {
    QString convErrorMsg;
    QString oEPSfilename = EPSfilename;
    //emit setStatusBarText( i18n("Converting PDF-file %1...", EPSfilename) );
    EPSfilename = dviFile->convertPDFtoPS(EPSfilename, &convErrorMsg);
    //emit setStatusBarText( QString::null );
    if (convErrorMsg.isEmpty() != true) {
/*      KMessageBox::detailedError(parentWidget,
                                 i18n("<qt><strong>File conversion error</strong> KDVI was not able to convert the external "
                                      "PDF file <strong>%1</strong> into PostScript. Expect missing graphics or graphic errors.</qt>", oEPSfilename),
                                 convErrorMsg, i18n("PDF/PS conversion error"));*/
      return;
    }
  }

  // Now parse the arguments.
  int  llx     = 0;
  int  lly     = 0;
  int  urx     = 0;
  int  ury     = 0;
  int  rwi     = 0;
  int  rhi     = 0;
  int  angle   = 0;

  // just to avoid ambiguities; the filename could contain keywords
  include_command = include_command.mid(include_command.indexOf(' '));

  parse_special_argument(include_command, "llx=", &llx);
  parse_special_argument(include_command, "lly=", &lly);
  parse_special_argument(include_command, "urx=", &urx);
  parse_special_argument(include_command, "ury=", &ury);
  parse_special_argument(include_command, "rwi=", &rwi);
  parse_special_argument(include_command, "rhi=", &rhi);
  parse_special_argument(include_command, "angle=", &angle);

  int clip=include_command.indexOf(" clip"); // -1 if clip keyword is not present, >= 0 otherwise

  if (QFile::exists(EPSfilename)) {
    double PS_H = (currinf.data.dvi_h*300.0)/(65536*1200)-300;
    double PS_V = (currinf.data.dvi_v*300.0)/1200 - 300;
    PostScriptOutPutString->append( QString(" %1 %2 moveto\n").arg(PS_H).arg(PS_V) );
    PostScriptOutPutString->append( "@beginspecial " );
    PostScriptOutPutString->append( QString(" %1 @llx").arg(llx) );
    PostScriptOutPutString->append( QString(" %1 @lly").arg(lly) );
    PostScriptOutPutString->append( QString(" %1 @urx").arg(urx) );
    PostScriptOutPutString->append( QString(" %1 @ury").arg(ury) );
    if (rwi != 0)
      PostScriptOutPutString->append( QString(" %1 @rwi").arg(rwi) );
    if (rhi != 0)
      PostScriptOutPutString->append( QString(" %1 @rhi").arg(rhi) );
    if (angle != 0)
      PostScriptOutPutString->append( QString(" %1 @angle").arg(angle) );
    if (clip != -1)
      PostScriptOutPutString->append(" @clip");
    PostScriptOutPutString->append( " @setspecial \n" );
    PostScriptOutPutString->append( QString(" (%1) run\n").arg(EPSfilename) );
    PostScriptOutPutString->append( "@endspecial \n" );
  }

  return;
}


void dviRenderer::prescan_ParseSourceSpecial(const QString& cp)
{
  // if no rendering takes place, i.e. when the DVI file is first
  // loaded, generate a DVI_SourceFileAnchor. These anchors are used
  // in forward search, i.e. to relate references line
  // "src:123file.tex" to positions in the DVI file

  // extract the file name and the numeral part from the string
  qint32 j;
  for(j=0;j<cp.length();j++)
    if (!cp.at(j).isNumber())
      break;
  quint32 sourceLineNumber = cp.left(j).toUInt();
  QFileInfo fi1(dviFile->filename);
  QString  sourceFileName   = QFileInfo(fi1.dir(), cp.mid(j).trimmed()).absoluteFilePath();
  Length l;
  l.setLength_in_inch(currinf.data.dvi_v/(resolutionInDPI*shrinkfactor));
  DVI_SourceFileAnchor sfa(sourceFileName, sourceLineNumber, current_page+1, l);
  sourceHyperLinkAnchors.push_back(sfa);
}


void dviRenderer::prescan_parseSpecials(char *cp, quint8 *)
{
  QString special_command(cp);

  // Now to those specials which are only interpreted during the
  // prescan phase, and NOT during rendering.

  // PaperSize special
  if (strncasecmp(cp, "papersize", 9) == 0) {
    prescan_ParsePapersizeSpecial(special_command.mid(9));
    return;
  }

  // color special for background color
  if (strncasecmp(cp, "background", 10) == 0) {
    prescan_ParseBackgroundSpecial(special_command.mid(10));
    return;
  }

  // HTML anchor special
  if (strncasecmp(cp, "html:<A name=", 13) == 0) {
    prescan_ParseHTMLAnchorSpecial(special_command.mid(14));
    return;
  }

  // Postscript Header File
  if (strncasecmp(cp, "header=", 7) == 0) {
    prescan_ParsePSHeaderSpecial(special_command.mid(7));
    return;
  }

  // Literal Postscript Header
  if (cp[0] == '!') {
    prescan_ParsePSBangSpecial(special_command.mid(1));
    return;
  }

  // Literal Postscript inclusion
  if (cp[0] == '"') {
    prescan_ParsePSQuoteSpecial(special_command.mid(1));
    return;
  }

  // PS-Postscript inclusion
  if (strncasecmp(cp, "ps:", 3) == 0) {
    prescan_ParsePSSpecial(special_command);
    return;
  }

  // Encapsulated Postscript File
  if (strncasecmp(cp, "PSfile=", 7) == 0) {
    prescan_ParsePSFileSpecial(special_command.mid(7));
    return;
  }

  // source special
  if (strncasecmp(cp, "src:", 4) == 0) {
    prescan_ParseSourceSpecial(special_command.mid(4));
    return;
  }

  // Finally there are those special commands which must be considered
  // both during rendering and during the pre-scan phase

  // HTML anchor end
  if (strncasecmp(cp, "html:</A>", 9) == 0) {
    html_anchor_end();
    return;
  }

  return;
}


void dviRenderer::prescan_setChar(unsigned int ch)
{
  TeXFontDefinition *fontp = currinf.fontp;
  if (fontp == NULL)
    return;

  if (currinf.set_char_p == &dviRenderer::set_char) {
    glyph *g = ((TeXFont *)(currinf.fontp->font))->getGlyph(ch, true, globalColor);
    if (g == NULL)
      return;
    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);
    return;
  }

  if (currinf.set_char_p == &dviRenderer::set_vf_char) {
    macro *m = &currinf.fontp->macrotable[ch];
    if (m->pos == NULL)
      return;
    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);
    return;
  }
}


void dviRenderer::prescan(parseSpecials specialParser)
{
#ifdef DEBUG_PRESCAN
  kDebug(kvs::dvi) << "dviRenderer::prescan( ... )" << endl;
#endif

  if (resolutionInDPI == 0.0)
    setResolution(100);

  qint32 RRtmp=0, WWtmp=0, XXtmp=0, YYtmp=0, ZZtmp=0;
  quint8 ch;
  double fontPixelPerDVIunit = dviFile->getCmPerDVIunit() * 1200.0/2.54;

  stack.clear();

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

  for (;;) {
    ch = readUINT8();

    if (ch <= (unsigned char) (SETCHAR0 + 127)) {
      prescan_setChar(ch);
      continue;
    }

    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.", ch - FNTNUM0);
        return;
      }
      currinf.set_char_p = currinf.fontp->set_char_p;
      continue;
    }


    qint32 a, b;

    switch (ch) {
    case SET1:
      prescan_setChar(readUINT8());
      break;

    case SETRULE:
      /* Be careful, dvicopy outputs rules with height =
         0x80000000. We don't want any SIGFPE here. */
      a = readUINT32();
      b = readUINT32();
      b = ((long) (b *  65536.0*fontPixelPerDVIunit));
      currinf.data.dvi_h += b;
      break;

    case PUTRULE:
      a = readUINT32();
      b = readUINT32();
      break;

    case PUT1:
    case NOP:
      break;

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

    case POP:
      if (stack.isEmpty())
        return;
      else
        currinf.data = stack.pop();
      break;

    case RIGHT1:
    case RIGHT2:
    case RIGHT3:
    case RIGHT4:
      RRtmp = readINT(ch - RIGHT1 + 1);
      currinf.data.dvi_h += ((long) (RRtmp *  65536.0*fontPixelPerDVIunit));
      break;

    case W1:
    case W2:
    case W3:
    case W4:
      WWtmp = readINT(ch - W0);
      currinf.data.w = ((long) (WWtmp *  65536.0*fontPixelPerDVIunit));
    case W0:
      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 *  65536.0*fontPixelPerDVIunit));
    case X0:
      currinf.data.dvi_h += currinf.data.x;
      break;

    case DOWN1:
    case DOWN2:
    case DOWN3:
    case DOWN4:
      {
        qint32 DDtmp = readINT(ch - DOWN1 + 1);
        currinf.data.dvi_v += ((long) (DDtmp *  65536.0*fontPixelPerDVIunit))/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 *  65536.0*fontPixelPerDVIunit));
    case Y0:
      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 *  65536.0*fontPixelPerDVIunit));
    case Z0:
      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:
    case FNT4:
      currinf.fontp = currinf.fonttable->find(readUINT(ch - FNT1 + 1));
      if (currinf.fontp == NULL)
        return;
      currinf.set_char_p = currinf.fontp->set_char_p;
      break;

    case XXX1:
    case XXX2:
    case XXX3:
    case XXX4:
      {
        quint8 *beginningOfSpecialCommand = command_pointer-1;
        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';
          (this->*specialParser)(cmd, beginningOfSpecialCommand);
          delete [] cmd;
        }
      }
      break;

    case FNTDEF1:
    case FNTDEF2:
    case FNTDEF3:
    case FNTDEF4:
      command_pointer += 12 + ch - FNTDEF1 + 1;
      command_pointer += readUINT8() + readUINT8();
      break;

    default:
      return;
    } /* end switch */
  } /* end for */
}